JP2007015301A - Manufacturing method of polyamide type mixed resin laminated film roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for efficiently manufacturing a biaxially oriented polyamide type mixed resin laminated film roll capable of being subjected to bag making processing smoothly in a good yield. <P>SOLUTION: The manufacturing method of the polyamide type mixed resin laminated film roll comprises a melt extrusion and cooling process for obtaining a non-stretched sheet 4 by extruding a polyamide type mixed resin to the surface of a moving cooling body in a sheetlike form to cool the same, a biaxial stretching process for biaxially stretching the non-stretched sheet in its longitudinal and lateral directions and a taking-up process for taking up the biaxially stretched film in a roll form. In the melt extrusion and cooling process, corona discharge in a streamer corona state is applied across an electrode, to which DC high voltage is applied, and the polyamide type mixed resin laminated sheet in a molten state when the polyamide type mixed resin is extruded to the surface of the moving cooling body in a molten state to be cooled and charge sufficient to closely bring the surface of the moving cooling body into contact with the polyamide type mixed resin laminated sheet in a molten state is applied to the polyamide type mixed resin laminated sheet. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a production method for producing a film roll obtained by winding up a high-quality polyamide-based mixed resin laminated film having a uniform physical property over a long length with high productivity. The present invention relates to a production method for producing a polyamide-based mixed resin laminated film roll having good processability when laminated with a resin film and used for packaging retort foods.

  Biaxially oriented polyamide resin film mainly composed of nylon is tough and has excellent gas barrier properties, pinhole resistance, transparency, printability, etc., so it can be used for various liquid foods, water-containing foods, frozen foods, It has been widely put into practical use as a packaging material for various foods such as retort foods, pasty foods, livestock meat and fishery foods, and in recent years, it has been widely used for packaging retort foods. Such a polyamide-based resin film is laminated with, for example, a polyolefin-based resin film such as polyethylene or polypropylene, folded in two parallel to the flow direction, then heat-sealed on three sides, and opened on one side. The three-side sealed bag is in a state, filled with various foods and the like, sealed, and then heat-sterilized in boiling water for market.

  However, when a biaxially oriented polyamide-based resin film is used, there is a phenomenon in which the corners of the packaging bag are warped after heat sterilization and the four sides curl into an S shape (hereinafter referred to as an S-curl phenomenon). It may occur and the appearance as a packaged product may be remarkably deteriorated. Therefore, as a method of reducing such curling phenomenon, as in Patent Document 1, the product of boiling water shrinkage strain rate and change rate of molecular orientation angle in the film width direction in a biaxially oriented polyamide resin film is adjusted to a specific value. In order to improve dimensional stability during boiling water treatment, it is necessary to extremely increase the temperature during heat setting or excessively perform relaxation heat treatment after stretching. Therefore, there arises a problem that the toughness and pinhole resistance of the obtained film are impaired.

  Therefore, as described in Patent Document 2, the applicants adjust the boiling water shrinkage and refractive index of the film to a specific numerical range, thereby reducing the S-curl phenomenon without reducing toughness and pinhole resistance. Invented and proposed a method for obtaining a biaxially oriented polyamide-based resin film that does not cause the problem.

Japanese Patent Laid-Open No. 4-103335 JP-A-8-174663

  According to the method of Patent Document 2 described above, it is possible to obtain a biaxially oriented polyamide-based resin film that is tough and excellent in pinhole resistance and does not cause an S-curl phenomenon. However, in the bag making process by lamination, the conditions such as pressure and time when heat-sealing are finely adjusted for each film roll used, so the boiling water shrinkage and refractive index of the film wound around the film roll Even in the case where the average value of physical property values such as is within the range of Patent Document 2, if the amount of fluctuation in one film roll is large, there is a wrinkle between the films when laminating in the bag making process. And troubles such as poor yield are likely to occur.

  On the other hand, in the manufacturing method of a biaxially stretched film roll for winding a biaxially stretched film after mixing and extruding a mixture of a plurality of resins, the applicants as raw material chips Proposed a method for reducing the segregation of the raw material by making the shape of the same and increasing the inclination angle of the funnel-like hopper which is a raw material supply unit to the extruder (Japanese Patent Laid-Open No. 2004-181777). However, this method is not necessarily a definitive method as a method for suppressing fluctuations and variations in physical properties such as boiling water shrinkage and refractive index of a film wound on a film roll.

  Therefore, as a result of earnestly examining the production technology for producing highly uniform biaxially stretched film rolls, the applicants have highly uniform physical properties such as film thickness, boiling water shrinkage rate and refractive index, The inventors have invented a polyamide-based resin film roll that can be formed with a high yield without causing wrinkles between the films when laminating (Japanese Patent Application No. 2004-262922).

  According to the polyamide resin film roll having highly uniform physical properties such as film thickness, boiling water shrinkage and refractive index as described above, the S-curl phenomenon is maintained without deteriorating the good toughness and pinhole resistance of the polyamide resin film. The processability at the time of laminating can be made good without causing the above. However, even if the polyamide-based resin film roll has a highly uniform physical property as described above, the polyamide-based resin laminated film is good on the roll of the laminating machine when laminating under high humidity such as summer. As a result, it was found that good processing characteristics cannot always be obtained.

  In addition, a film made only of a polyamide-based resin has a limit in pinhole resistance, and is not necessarily suitable for food packaging applications containing a large amount of water such as liquid soup. As a means for improving the pinhole resistance of a polyamide-based resin film, a method of filling an elastomer into a polyamide-based resin as a film raw material is known, but in such a mixed resin film roll, It is not possible to obtain good processability at the time of laminating by simply reducing the fluctuations in physical properties such as boiling water shrinkage and refractive index, and there is variation in pinhole resistance in each laminated three-sided seal bag. End up.

  On the other hand, in the production of the above-described polyamide-based resin film roll, an unstretched sheet is formed by cooling and solidifying a sheet that is melt-extruded from an extruder through a die on a moving cooling body such as a cooling roll (metal roll). . Further, in such cooling and solidification with a cooling roll, if the molten polyamide resin sheet can be brought into close contact with the moving cooling body directly without interposing a thin layer of air, the molten resin can be rapidly cooled. This makes it possible to obtain an unstretched sheet having a low degree of crystallinity. Therefore, in the cooling and solidification by the cooling roll, a wire-like electrode is provided between the die and the moving cooling body so that the extruded molten sheet is forcibly brought into close contact with the cooling body surface within a short time. A method is adopted in which an electrostatic charge is deposited on the surface of the sheet and the unsolidified sheet is forcibly adhered to the surface of the cooling body (hereinafter, an unsolidified sheet molding method using the forced adhesion by the electrostatic charge is referred to as an electrostatic application molding method. Called).

  However, when the take-up speed of the sheet is slow, adhesion by electrostatic charges deposited on the sheet surface is possible, but if the take-up speed is increased, adhesion by electrostatic force becomes impossible, and a thin layer of air is in a molten state. And the moving cooling body surface, the thickness variation of the sheet is increased, the cooling of the molten sheet is delayed, the cooling spots are generated, the crystallization is progressed, and the poorly transparent sheet having the crystallization spots is obtained. Furthermore, precipitation of polyamide polymer oligomers occurs on the moving cooling body surface. For this reason, if the voltage applied to the electrode arranged between the die and the moving cooling body surface is increased in order to increase the amount of electrostatic charge deposited on the sheet-like material surface, the non-between the electrode and the cooling body surface Continuous arc discharge occurs, and the sheet-like material on the surface of the cooling body is destroyed. In a severe case, the surface coating of the cooling body is destroyed. Therefore, the voltage applied to the electrode cannot be increased to a certain extent, and in the conventional electrostatic application molding method, a highly uniform polyamide-based resin film roll as described in Japanese Patent Application No. 2004-262922 has a film forming speed. It was impossible to make it high enough.

  The inventors of the present invention diligently investigated the improvement of the prior art, and used a multi-needle electrode to cool the film-forming polyamide-based mixed resin into a sheet-like melt-extruded sheet for cooling. The corona discharge in the streamer corona state is performed between the electrode and the molten resin sheet, and the arc is not caused by giving the molten polyamide-based mixed resin laminated sheet a sufficient charge to adhere to the moving cooling body surface. Successfully applied a high current at a low voltage. As a result, various disadvantages in the conventional electrostatic application molding method can be solved at once, oligomers are not deposited on the moving cooling body, thickness uniformity and transparency are excellent, crystallinity is low, and crystal The present invention has found that a polyamide-based mixed resin laminated sheet with few spots can be formed at a high speed, and that the film-forming property is more stable when forming a film at a normal speed (conventional speed). Has reached

  In addition, the present invention provides a production technique for making the polyamide resin film highly slippery under high humidity and has no fluctuation, and biaxial stretching made of a mixed resin of a polyamide resin and an elastomer. This has been achieved as a result of earnest research and development on production technology to make the mixed resin film highly uniform. And it can be used for packaging applications that require extremely high pinhole resistance, eliminating the problems of conventional polyamide resin film roll manufacturing methods, and there is almost no trouble even under high humidity such as in summer. To provide a production method capable of efficiently producing a biaxially oriented polyamide-based resin laminated film roll capable of smoothly carrying out a bag making process by lamination and capable of efficiently obtaining a package having no S-curl. Is also intended. Another object of the present invention is to provide a production method capable of efficiently producing a biaxially oriented polyamide-based mixed resin laminated film roll capable of obtaining a processed product with a high yield in post-processing such as bag making. It is.

Among the present inventions, the configuration of the invention described in claim 1 is a polyamide-based mixed resin laminated film formed by laminating a plurality of polyamide-based resin sheets made of a mixed resin of a polyamide-based resin and a thermoplastic elastomer. A method for producing a polyamide-based mixed resin laminated film roll having a width of 0.2 m or more and 3.0 m or less and a length of 300 m or more and 30000 m or less, comprising mixing a polyamide resin and a thermoplastic elastomer A melt extrusion cooling process for obtaining an unstretched sheet by melting and extruding the resin into a sheet on the moving cooling body surface and cooling, a biaxial stretching process for biaxially stretching the unstretched sheet in the longitudinal direction and the transverse direction, and biaxially stretched A winding process for winding the biaxially stretched film into a roll shape, and the melt extrusion cooling process is performed with the polyamide-based resin. In the melt extrusion cooling of the mixed resin with the functional elastomer to the moving cooling body surface, the corona discharge in the streamer corona state is performed between the electrode applied with DC high voltage and the polyamide-based mixed resin laminated sheet in the molten state, and the molten state The polyamide-based mixed resin laminated sheet is given a sufficient charge to adhere to the moving cooling body surface. The polyamide-based mixed resin laminated film wound up in a roll shape is the first within 2 m from the end of the film winding. In addition, when the final cutout portion is provided within 2 m from the beginning of film winding and the sample cutout portion is provided at intervals of about 100 m from the first sample cutout portion, the following requirements (1) and ( It is to satisfy 2).
(1) When the content of the thermoplastic elastomer component is measured for each sample cut out from each cut-out portion and the average content rate, which is the average value of the content rates, is calculated, the thermoplasticity of all the samples The variation rate of the content of the elastomer component is within a range of ± 10% with respect to the average content rate. (2) The variation rate of the thickness over the entire length in the longitudinal direction of the wound roll is ± with respect to the average thickness. Within 2% to ± 10%

The structure of the invention described in claim 2 is that a polyamide-based mixed resin laminated film formed by laminating a plurality of polyamide-based resin sheets made of a mixed resin of a polyamide-based resin and a thermoplastic elastomer has a width of 0.2 m or more. A method for producing a polyamide-based mixed resin laminated film roll wound up to have a length of 3.0 m or less and a length of 300 m or more and 30000 m or less, wherein a mixed resin of a polyamide-based resin and a thermoplastic elastomer is placed on a moving cooling body surface A melt extrusion cooling step of obtaining an unstretched sheet by melt extrusion extrusion cooling into a sheet, a biaxial stretching step of biaxially stretching the unstretched sheet in the longitudinal direction and the transverse direction, and a biaxially stretched biaxially stretched film A winding step of winding in a roll shape, and the melt extrusion cooling step includes the polyamide-based resin, the thermoplastic elastomer, During melt extrusion cooling of the mixed resin to the moving cooling body surface, a corona discharge in a streamer corona state is performed between the electrode applied with DC high voltage and the polyamide-based mixed resin laminated sheet in the molten state, and the molten polyamide-based mixing is performed. The polyamide-based mixed resin laminated film wound up in a roll shape is the first sample cut-out section within 2 m from the end of the film winding, which gives the resin laminated sheet sufficient charge to adhere to the moving cooling body surface. In addition, when the final cutout portion is provided within 2 m from the beginning of winding of the film and the sample cutout portion is provided every about 100 m from the first sample cutout portion, the following requirement (3) is satisfied.
(3) For each sample cut out from each cut-out part, when the tensile elastic modulus in the winding direction of the film was measured, the average tensile elastic modulus, which is the average value of the tensile elastic modulus, was 1.30 GPa or more 2 Less than 50 GPa, and the variation rate of the tensile modulus of elasticity of all the samples is within ± 10% of the average tensile modulus.

The structure of the invention described in claim 3 is that a polyamide-based mixed resin laminated film formed by laminating a plurality of polyamide-based resin sheets made of a mixed resin of a polyamide-based resin and a thermoplastic elastomer has a width of 0.2 m or more. A method for producing a polyamide-based mixed resin laminated film roll wound up to have a length of 3.0 m or less and a length of 300 m or more and 30000 m or less, wherein a mixed resin of a polyamide-based resin and a thermoplastic elastomer is placed on a moving cooling body surface A melt extrusion cooling step of obtaining an unstretched sheet by melt extrusion extrusion cooling into a sheet, a biaxial stretching step of biaxially stretching the unstretched sheet in the longitudinal direction and the transverse direction, and a biaxially stretched biaxially stretched film A winding step of winding in a roll shape, and the melt extrusion cooling step includes the polyamide-based resin, the thermoplastic elastomer, During melt extrusion cooling of the mixed resin to the moving cooling body surface, a corona discharge in a streamer corona state is performed between the electrode applied with DC high voltage and the polyamide-based mixed resin laminated sheet in the molten state, and the molten polyamide-based mixing is performed. The polyamide-based mixed resin laminated film wound up in a roll shape is the first sample cut-out section within 2 m from the end of the film winding, which gives the resin laminated sheet sufficient charge to adhere to the moving cooling body surface. In addition, when the final cutout portion is provided within 2 m from the beginning of winding of the film and the sample cutout portion is provided every about 100 m from the first sample cutout portion, the following requirement (4) is satisfied.
(4) For each sample cut out from each cut-out part, the number of pinholes when a 3000-cycle bending test was continuously performed at a rate of 40 cycles per minute using a gelbo flex tester, All are 10 or less

  The structure of the invention described in claim 4 is the invention described in any one of claims 1 to 3, wherein the polyamide-based mixed resin laminated film wound up in a roll shape is cut out from each cut-out portion. For each sample, when the maximum boiling water shrinkage rate, which is the maximum value among the boiling water shrinkage rates in all directions, was measured, the average boiling water shrinkage rate, which is an average value of the maximum boiling water shrinkage rates, is 2% to 6%. At the same time, the variation rate of the maximum boiling water shrinkage rate of all the samples is in the range of ± 2% to ± 10% with respect to the average boiling water shrinkage rate.

  The structure of the invention described in claim 5 is the invention described in any one of claims 1 to 3, wherein the polyamide-based mixed resin laminated film wound up in a roll shape is cut out from each of the cutout portions. When the boiling water shrinkage direction difference, which is the absolute value of the difference between the boiling water shrinkage rate in the +45 degree direction with respect to the longitudinal direction and the boiling water shrinkage ratio in the −45 degree direction with respect to the longitudinal direction, was determined for each sample. The average boiling water shrinkage direction difference, which is the average value of shrinkage direction differences, is 2.0% or less, and the fluctuation rate of the boiling water shrinkage direction difference of all the samples is ± with respect to the average boiling water shrinkage direction difference. It is in the range of 2% to ± 30%.

The structure of the invention described in claim 6 is the invention described in any one of claims 1 to 3, wherein the polyamide-based mixed resin laminated film wound up in a roll shape is cut out from each of the cutout portions. Each sample satisfies the following requirement (5) and the following requirement (6).
(5) When measuring the three-dimensional surface roughness in the winding direction, the average surface roughness, which is the average value of the three-dimensional surface roughness, is in the range of 0.01 to 0.06 μm, and all The variation rate of the three-dimensional surface roughness of the sample is in the range of ± 5% to ± 20% with respect to the average surface roughness. (6) When haze is measured, the average value of those hazes A certain average haze is in the range of 1.0 to 4.0, and the haze variation rate of all the samples is in the range of ± 2% to ± 15% with respect to the average haze.

  The structure of the invention described in claim 7 is the invention described in any one of claims 1 to 3, wherein the polyamide-based mixed resin laminated film wound up in a roll shape is cut out from each cut-out portion. For each sample, when the dynamic friction coefficient was measured in an atmosphere of 80% RH at 23 ° C., the average dynamic friction coefficient, which is the average value of the dynamic friction coefficients, was in the range of 0.3 to 0.8, and all The variation rate of the dynamic friction coefficient of the sample is in the range of ± 5% to ± 30% with respect to the average dynamic friction coefficient.

  The structure of the invention described in claim 8 is the invention described in any one of claims 1 to 3, wherein the polyamide-based mixed resin laminated film wound up in a roll shape is cut out from each cut-out portion. For each sample, when the content of inorganic particles was measured, the average content of those inorganic particles was within the range of 0.01 to 0.5% by weight, and all the samples The variation rate of the inorganic particle content is in the range of ± 2% to ± 10% with respect to the average content.

  The structure of the invention described in claim 9 is the invention described in any one of claims 1 to 3, wherein the polyamide-based mixed resin laminated film wound up in a roll shape is cut out from each cut-out portion. For each sample, when the refractive index in the thickness direction was measured, the average refractive index, which is the average value of the refractive indexes, was 1.500 or more and 1.520 or less, and the variation rate of the refractive index of all samples was The average refractive index is within a range of ± 2%.

  The structure of the invention described in claim 10 is the invention described in any one of claims 1 to 3, wherein the wound polyamide-based mixed resin laminated film is 1/3 of the total thickness of the front and back surfaces. The average particle size of the inorganic particles in the portion is smaller than the average particle size of the inorganic particles in the portion other than the surface layer.

  The structure of the invention described in claim 11 is the invention described in any one of claims 1 to 3, wherein the main component of the polyamide constituting the polyamide-based mixed resin laminated film wound up in a roll shape is nylon 6 It is to be.

  According to a twelfth aspect of the present invention, in the invention according to any one of the first to third aspects, a polyamide-based mixed resin laminated film formed from a mixture of two or more different polyamide-based resins is wound up. There is.

  The structure of the invention described in claim 13 is that, in the invention described in any one of claims 1 to 3, the wound polyamide-based mixed resin laminated film is laminated with a polyolefin-based resin film. is there.

  The structure of the invention described in claim 14 is obtained in the invention described in any one of claims 1 to 3 by extruding a melted polyamide-based resin from a T-die and bringing it into contact with a metal roll and cooling it. It is to wind up a polyamide-based mixed resin laminated film obtained by biaxially stretching the obtained non-oriented sheet-like material.

  The structure of the invention described in claim 15 is to wind up the polyamide-based mixed resin laminated film stretched by the tenter stretching method in the invention described in any one of claims 1 to 3.

  The structure of the invention described in claim 16 is that in the invention described in any one of claims 1 to 3, the polyamide-based mixed resin laminated film which is sequentially biaxially stretched is wound.

  The structure of the invention described in claim 17 is that in the invention described in any one of claims 1 to 3, the polyamide-based mixed resin laminated film stretched biaxially in the vertical direction and the horizontal direction is wound up. is there.

  The structure of the invention described in claim 18 is the glass transition of the polyamide resin according to the invention described in any one of claims 1 to 3, wherein the sheet-like material made of a substantially unoriented polyamide resin is used. Winding the polyamide-based mixed resin laminated film stretched in the longitudinal direction in at least two stages so as to obtain a magnification of 3 times or more at a temperature higher than the temperature + 20 ° C. and then stretched in the transverse direction so as to obtain a magnification of 3 times or more There is.

  According to a nineteenth aspect of the present invention, in the invention according to any one of the first to third aspects, the polyamide-based mixed resin laminated film that has been heat-set after the final stretching treatment is wound up. is there.

  According to a twentieth aspect of the present invention, there is provided the invention according to any one of the first to third aspects, wherein the polyamide-based mixed resin laminated film that has been subjected to relaxation treatment after heat setting is wound.

  The structure of the invention described in claim 21 is the invention described in any one of claims 1 to 3, wherein the wound polyamide-based mixed resin laminated film contains a lubricant, an anti-blocking agent, a heat stabilizer, That is, at least one of an antioxidant, an antistatic agent, a light resistant agent, and an impact resistance improving agent is added.

  The structure of the invention described in claim 22 is that, in the invention described in any one of claims 1 to 3, inorganic particles are added to the wound polyamide-based mixed resin laminated film. .

  The structure of the invention described in claim 23 is that, in the invention described in claim 22, the inorganic particles are silica particles having an average particle diameter of 0.5 to 5.0 μm.

  The structure of the invention described in claim 24 is that, in the invention described in any one of claims 1 to 3, a higher fatty acid is added to the wound polyamide-based mixed resin laminated film. .

The structure of the invention described in claim 25 is the invention described in any one of claims 1 to 3, wherein a mixed resin composed of a polyamide resin and a thermoplastic elastomer is melted from a plurality of extruders by a coextrusion method. A film-forming process for forming an unstretched polyamide-based mixed resin laminate sheet by extrusion, and an unstretched polyamide-based mixed resin laminate sheet obtained in the film-forming process are biaxially stretched in the longitudinal direction and the transverse direction. An axial stretching step and satisfy the following requirements (a) to (f).
(A) In the film forming step, the polyamide resin chip and the thermoplastic elastomer chip are mixed and then melt-extruded, and the mixture of the polyamide resin chip and the thermoplastic elastomer chip is sublimated and segregated. (B) A polyamide-based mixed resin in which the film forming step is performed by mixing a polyamide-based resin chip and a thermoplastic elastomer chip and adding 0.1 to 2.0% by weight of inorganic particles. (C) The biaxial stretching step involves stretching in two stages in the longitudinal direction and then stretching in the transverse direction, and the first stage in the two-stage stretching in the longitudinal direction. (D) The film forming step includes a polyamide resin chip and a thermoplastic resin. It is melt extruded from each extruder after mixing with a steamer chip, and the shape of each chip used is an elliptical cylinder having an elliptical cross section having a major axis and a minor axis, and a thermoplastic elastomer The tip is adjusted to have an average major axis, an average minor axis, and an average tip length that are included within ± 25% of the average major axis, average minor axis, and average tip length of the polyamide resin chip, respectively. (E) The film forming step includes a step of melt extrusion using a plurality of extruders provided with a funnel-shaped hopper as a raw material chip supply unit, and all the inclination angles of the funnel-shaped hopper are 65 degrees or more. The moisture content of the polyamide resin chip before being supplied to the funnel-shaped hopper is 800 ppm or more and 1000 ppm or less. The temperature of the polyamide-based resin chip before being supplied to the funnel-shaped hopper is adjusted to 80 ° C. or higher. (F) The film forming step is performed simultaneously from the plurality of extruders. It includes a step of cooling by winding the polyamide-based mixed resin laminated sheet melt-extruded by an extrusion method around a cooling roll, and in that cooling step, the contact between the polyamide-based mixed resin laminated sheet and the surface of the cooling roll The part is sucked in the direction opposite to the winding direction by the suction device over the entire width of the polyamide-based mixed resin laminated sheet.

  The structure of the invention described in claim 26 is the invention described in any one of claims 1 to 3, wherein the preheating step performed before the longitudinal stretching step and the heat treatment performed after the longitudinal stretching step. The fluctuation range of the surface temperature of the film at any point in the longitudinal stretching process, the preheating process, and the heat treatment process is adjusted within the range of the average temperature ± 1 ° C over the entire length of the film. There is in being.

  According to a twenty-seventh aspect of the invention, there is provided a multi-needle electrode according to any one of the first to third aspects, wherein the streamer corona discharge in the melt extrusion cooling step applies a DC high voltage. And the polyamide-based mixed resin laminated sheet in a molten state.

  According to a 28th aspect of the present invention, in the invention described in the 25th aspect, the film forming step uses 0.05 to 2.0% by weight of inorganic particles by using a high-concentration raw material chip. The added skin layer is laminated on the core layer.

  The composition of the invention described in claim 29 is the polyamide according to claim 25, wherein the high-concentration raw material chip used in the film forming step is added with 5% by weight or more and less than 20% by weight of inorganic particles. It is based on a resin chip.

  The structure of the invention described in claim 30 is the invention described in claim 25, wherein in the film forming step, the inorganic particles added to the polyamide-based resin sheet laminated on the outermost layer have a pore volume of 0. The average particle size is 1.0 to 5.0 μm at a rate of 0.5 to 2.0 ml / g.

  According to the production method of the present invention, a polyamide-based mixed resin laminated sheet having a uniform thickness, low crystallinity, excellent transparency, and few crystallization spots can be formed at high speed. No contamination with oligomers. Therefore, according to the production method of the present invention, a highly uniform polyamide-based mixed resin laminated film roll can be produced very efficiently at a sufficiently high film production speed. That is, according to the polyamide-based mixed resin laminated film roll obtained with high productivity by the production method of the present invention, a laminate of a three-side sealed bag for packaging liquid soup or the like that requires high pinhole resistance Even when the bag making process is performed under high humidity such as in the summer, it can be carried out smoothly with almost no trouble, and a package without S-curl can be obtained efficiently. Further, in post-processing such as bag making processing, a processed product can be obtained with a high yield. In addition, if the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is used, the food packaging bag after the bag-making process by lamination will have extremely high pinhole resistance. The variation in pinhole resistance for each bag is reduced.

  Hereinafter, the preferable aspect of the manufacturing method of the polyamide type mixed resin laminated | multilayer film roll of this invention is demonstrated. According to the production method of the present invention, an unstretched sheet (unstretched laminated sheet) obtained by melt-extruding a polyamide-based mixed resin (a polyamide-based resin and an elastomer resin) is subjected to a longitudinal direction (longitudinal direction) and a lateral direction (width). The polyamide-based mixed resin laminated film roll is manufactured by winding in a roll after biaxially stretching in the direction).

  Examples of the polyamide resin used in the present invention include nylon 6 using ε-caprolactam as a main raw material. Examples of other polyamide resins include polyamide resins obtained by polycondensation of lactams having three or more members, ω-amino acids, dibasic acids and diamines. Specifically, as lactams, in addition to the aforementioned ε-caprolactam, enantolactam, capryllactam, lauryllactam, and ω-amino acids include 6-aminocaproic acid, 7-aminoheptanoic acid, 9- Examples include aminononanoic acid and 11-aminoundecanoic acid. Dibasic acids include adipic acid, glutaric acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecadioic acid, hexadecadioic acid, eicosandioic acid, eicosadienedioic acid, 2 2,4-trimethyladipic acid, terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, and xylylenedicarboxylic acid. Furthermore, as diamines, ethylenediamine, trimethylenediamine, tetramethylenediamine, hexamethylenediamine, pentamethylenediamine, undecamethylenediamine, 2,2,4 (or 2,4,4) -trimethylhexamethylenediamine, cyclohexane Examples thereof include diamine, bis- (4,4′-aminocyclohexyl) methane, and metaxylylenediamine. And polymers obtained by polycondensation of these or copolymers thereof, such as nylon 6, 7, 11, 12, 6.6, 6.9, 6.11, 6.12, 6T, 6I, MXD6 (Metaxylene dipanamid 6), 6 / 6.6, 6/12, 6 / 6T, 6 / 6I, 6 / MXD6, and the like can be used. In addition, when producing the polyamide-based mixed resin laminated film roll of the present invention, the above-mentioned polyamide resins can be used alone or in admixture of two or more.

  Of the polyamide-based resins, those having a relative viscosity in the range of 2.0 to 3.5 are particularly preferable in the present invention. The relative viscosity of the polyamide-based resin affects the toughness and spreadability of the resulting biaxially stretched film. If the relative viscosity is less than 2.0, the impact strength tends to be insufficient. This is because, if it exceeds 3.5, the biaxial stretchability tends to deteriorate with increasing stretching stress. In addition, the relative viscosity in this invention means the value at the time of measuring at 25 degreeC using the solution which melt | dissolved 0.5g of polymers in 50 ml of 97.5% sulfuric acid.

  Examples of the thermoplastic elastomer used in the present invention include a polyamide such as a block or random copolymer of a polyamide-based resin such as nylon 6 or nylon 12 and PTMG (polytetramethylene glycol) or PEG (polyethylene glycol). It is preferable to use a polyolefin-based elastomer, an ethylene-methacrylic acid copolymer, a copolymer of ethylene and butene, a polyolefin-based elastomer such as a copolymer of styrene or butadiene, or an ionomer of an olefin-based resin such as an ethylene-based ionomer. it can.

  Further, the amount of the thermoplastic elastomer added to the polyamide resin is not particularly limited, but the lower limit of the addition amount is preferably 1% by weight or more, more preferably 2% by weight or more. More preferably, it is at least wt%. On the other hand, the upper limit of the addition amount is preferably 15% by weight or less, more preferably 10% by weight or less, and further preferably 6% by weight or less. If the added amount of the thermoplastic elastomer is less than 1% by weight, it is not preferable because good pinhole resistance cannot be obtained. Conversely, if the added amount of the thermoplastic elastomer exceeds 15% by weight, the toughness of the film is reduced. It is not preferable because it is damaged.

  The polyamide-based mixed resin laminated film may have a configuration of A / B (two types and two layers), A / B / A (two types and three layers), or A / B / C (three types and three layers). is necessary. From the viewpoint of curling, an A / B / A configuration that is a symmetrical layer configuration is preferable. In the following description, among the layers constituting the laminated film, the central layer not located on the outermost side (that is, the B layer in the case of the A / B / A or A / B / C layer configuration) A thick layer (that is, a B layer in the case of an A / B layer configuration of a thin A layer and a thick B layer) in the case of a two-type two-layer configuration is referred to as a core layer. Further, the outermost layers (that is, the A and B layers in the case of the A / B layer structure, the A and C layers in the case of the A / B / A or A / B / C layer structure), and two A thin layer (that is, an A layer in the case of an A / B layer configuration of a thin A layer and a thick B layer) in the case of the seed two-layer configuration is referred to as a skin layer.

  The thickness ratio of each layer of the polyamide-based mixed resin laminated film is preferably 5 to 50% of the A layer or the A layer and the C layer, more preferably 10 to 20%, particularly preferably 12 to 18%. It is. In the case of the A / B / A configuration of two types and three layers, the thickness ratio of the A layer of the surface layer described above means the sum of the thickness ratios of both surface layers, and in the case of the A / B / C configuration of the three types and three layers Means the sum of the thickness ratios of the two surface layers. If the thickness ratio of the A layer, or the A layer and the C layer is less than 5%, the variation rate of the turbidity due to the thickness unevenness becomes large, which is not preferable. On the other hand, if the thickness ratio of the A layer or the A layer and the C layer exceeds 30%, the bending fatigue resistance deteriorates, the number of pinholes increases, and the transparency deteriorates, which is not preferable.

  In order to manufacture the laminated film as described above, a substantially unoriented polyamide-based mixed resin sheet having a layer configuration of A / B, A / B / A, or A / B / C is manufactured. In forming a film, the polymer constituting each layer is melted using a separate extruder, co-extruded, cast onto a rotating drum from a die, and rapidly cooled and solidified to solidify substantially unoriented polyamide mixed resin sheet. A method (so-called coextrusion method) for obtaining the above can be suitably employed.

  In melt extrusion of a polyamide-based mixed resin and a thermoplastic elastomer, extrusion is performed on a flat plate by a flat die such as a T die or an I die. The extruded sheet is cooled on the surface of a moving cooling body such as a cooling roll (metal roll) to obtain a substantially non-oriented sheet. In order to suppress crystallization of the extruded sheet, the cooling temperature of the extruded sheet is preferably in the temperature range of the dew point or higher and the maximum crystallization temperature of −20 ° C. or lower. In the above, the maximum crystallization temperature (Tc) is determined by DSC (Differential Scanning Calorimeter), and in the case of nylon 6, it is usually 180 to 200 ° C., but varies depending on the type of polymer and the addition of various additives. When the cooling temperature of the extruded sheet is Tg + 10 ° C. or higher, the cooled sheet is easily deformed. Therefore, in order to cool at Tg + 10 ° C. or lower, it is preferable to further cool the second stage. Cooling of the extruded sheet can be performed by using cooling means such as application of a cooling liquid from the side opposite to the moving cooling body surface, spraying of a cooling gas, or immersion in a cooling liquid tank.

  The surface of the moving cooling body may be either mirror finish or rough finish. The surface material is preferably one that can withstand long-term use, but is not particularly limited. Examples of the surface material include hard chrome plating, ceramic coating, and Teflon (registered trademark) coating.

  Although some AC components may be superimposed on the high-voltage DC used in the present invention, the voltage or current is stabilized as much as possible, preferably when a dummy resistor is connected between the output terminal and the ground terminal for measurement. It is preferable to use a DC power supply having a ripple (peak to peak) of 1.0% or less. The polarity of the electrode is not limited, but a negative potential is particularly preferred.

  A feature of the present invention is to provide a high current at a low pressure by generating a corona discharge in a streamer corona state between an electrode and a melt-extruded polyamide-based mixed resin laminated sheet. Compared with, it is possible to apply a current several tens of times greater. Here, the corona discharge in the streamer corona state refers to a stable corona state in which an electrode and a ground plate (molten resin sheet) are bridged (see Japanese Patent Publication No. 62-41095). When the electrode has a positive potential, a corona concentrated in a rod shape from the tip of the electrode to the molten sheet is formed.When the electrode has a negative potential, a corona extending in a bell shape from the electrode tip to the molten sheet is formed. As the corona discharge in the streamer corona state, the corona discharge in either state can be adopted.

  In order to stably generate the corona discharge in the streamer corona state of the present invention, it is necessary to discontinuously dispose the discharge points. For this purpose, for example, a multi-needle electrode (an electrode in which a large number of needle-like bodies are juxtaposed in the same direction with almost no gap from a long support covered with an insulator such as silicon) or a saw-tooth electrode However, it is not particularly limited in the present invention. The number of discharge points and the arrangement method can be arbitrarily selected. In addition, the material of the discharge body may be anything as long as it is electrically conductive, and examples thereof include metals (particularly stainless steel) and carbon. In addition, it is preferable that the needle-like body in the multi-needle electrode has an acute-angled tip. In addition, when the tip of the needle-like body has an acute angle, the streamer corona discharge state becomes more stable when the thickness of the portion other than the tip is 0.5 to 5.0 mmφ (diameter). Therefore, it is preferable and it is more preferable in it being 1.0-3.0 mmphi. In addition, it is not necessary to discharge all the needle-like bodies of the multi-needle electrode to the molten resin sheet, and the interval of the streamer corona discharge can be appropriately changed by adjusting the applied voltage or the like.

  Furthermore, in the method of the present invention, in order to stably generate the corona discharge in the streamer corona state, for example, the gap between the discharge point of the electrode and the molten resin sheet is preferably 2 to 20 mm, and preferably 2 to 10 mm. A range is particularly preferable. By disposing the discharge points in this way, a stable streamer corona discharge with shine is generated between the electrode and the molten polyamide-based mixed resin laminated sheet, and a high current flows at the same time. Moreover, the thickness of the sheet | seat shape | molded by this invention is although it does not specifically limit, 50-500 micrometers is preferable and 100-300 micrometers is more preferable. On the other hand, the take-up speed of the sheet molded in the present invention is not particularly limited. The maximum take-up speed by the conventional electrostatic application molding method is about 50 m / min. However, in the method of the present invention, close cooling is possible even at about 80 m / min above this take-up speed. As described above, when streamer corona discharge is used, the maximum take-up speed increases dramatically. However, when streamer corona discharge is used at a normal take-up speed, the film forming property is more stable. And the frequency of breakage is significantly reduced.

  Further, as described above, when performing streamer corona discharge, it is preferable to adjust the voltage to be applied to a range of 7 to 14 kv because the thickness variation in the vertical direction of the film roll, the variation in physical properties, and the variation are reduced. Further, in the method for producing a film roll of the present invention, it is necessary to suppress variation in applied voltage within an average voltage (set value) of ± 20%, and more preferably within ± 10%.

  Furthermore, as described above, when performing streamer corona discharge, the atmosphere around the electrodes is not dried in the range of humidity 40 to 85% RH and temperature 35 to 55 ° C. It is preferable to adjust so as not to form a dew point because an oligomer (such as an oligomer of ε-caprolactam) can be prevented from adhering to the tip of the electrode or the tip of the saw blade, and streamer corona discharge becomes stable. A more preferable humidity range is 60 to 80% RH, and a more preferable temperature range is 40 to 50 ° C.

  Next, the method of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing an embodiment of a sheet manufacturing process according to the method of the present invention. In FIG. 1, a sheet-like melt 2 is extruded from a die 1 and cooled and solidified by a cooling drum 3 to form an unstretched sheet 4. A voltage is applied to the electrode 6 by the DC high voltage power source 5, and a streamer corona discharge 7 is generated from the electrode 6 to the sheet-like melt.

  According to the production method of the present invention, the polyamide-based mixed resin laminated film roll is obtained by melting and extruding the resin (polyamide resin chip and thermoplastic elastomer chip) onto the moving cooling body surface and cooling it as described above. It is manufactured by biaxially stretching in the longitudinal direction (longitudinal direction) and the transverse direction (width direction) and then winding it into a roll.

  In addition, as a result of investigations on fluctuations and variations in physical properties such as thickness variation in the vertical direction of the film roll (thickness variation over the entire length of the film roll) and boiling water shrinkage rate, the present inventors have found such thickness variation and physical properties in the vertical direction. It has been found that the fluctuations and variations are greatly influenced mainly by various factors in the casting process in which a molten resin is converted into an unstretched film. That is, if the temperature of the resin when supplying to a funnel-shaped popper directly connected to each extruder (hereinafter simply referred to as a hopper) is low or the moisture content of the resin supplied to the hopper is high, the longitudinal direction of the unstretched film It was found that the thickness unevenness increased and the physical property variation and variation in the biaxially stretched film increased. In addition, when the resin extruded from the T die is wound around a metal roll, even if the contact point between the resin and the metal roll is disturbed, the thickness unevenness in the longitudinal direction in the unstretched film becomes large, and the physical properties in the biaxially stretched film It was found that the fluctuation and variation of Furthermore, it was also found that if the stretching conditions in the biaxial stretching process are inappropriate, the thickness unevenness in the longitudinal direction of the unstretched film is amplified, which promotes fluctuations and variations in physical properties.

Furthermore, as a result of intensive studies based on the above-mentioned facts, the present inventors have taken the following measures to produce a film roll, which has little fluctuation in physical properties and maintains good slipperiness even under high humidity. I found out that I could get
(1) Uniform shape of polyamide resin chip and elastomer chip (2) Reduction of moisture content when resin chip is dried (3) Temperature retention when resin is supplied to hopper (4) Optimization of hopper shape (5) Resin Addition of segregation inhibitor during mixing (6) Removal of adverse effects due to addition of segregation inhibitor (7) Optimization of stretching conditions (8) Use of high-concentration raw material chips (9) Adjustment of properties of inorganic particles (10) Film Adjustment of Laminate Mode Hereinafter, each of the above-described means will be sequentially described.

(1) Unification of the shape of the polyamide-based resin chip and the elastomer chip In the manufacturing method of the polyamide-based mixed resin laminated film roll of the present invention, after blending the raw material polyamide resin chip and the elastomer chip in the hopper, It is melt-kneaded in an extruder (extruder for forming each layer of a laminated film) and melt-extruded to form a film (so-called blend method). That is, the polyamide-based resin chip and the elastomer chip are supplied continuously or intermittently in separate hoppers, and finally passed through a buffer hopper as needed, and finally, a hopper immediately before or immediately above each extruder (hereinafter referred to as a hopper) , Referred to as “final hopper”), while mixing the polyamide resin chip and the elastomer chip, the raw material chips are quantitatively supplied to the extruder according to the extrusion amount to form a film.

  However, depending on the capacity or shape of the final hopper, when the amount of chips in the final hopper is large and when the remaining amount of chips in the final hopper is small, the material segregation phenomenon, that is, from the final hopper to each extruder. A phenomenon occurs in which the composition of the supplied chip is different. Further, such segregation phenomenon appears particularly prominent when the shape or specific gravity of the chip is different. Furthermore, due to such segregation phenomenon, when a long film is produced, the tensile elastic modulus, pinhole resistance, maximum boiling water shrinkage rate, boiling water shrinkage direction difference, film thickness, and refractive index in the thickness direction vary.

  That is, if there is a difference between the size of the polyamide resin chip and the size of the elastomer chip, when the mixture of chips falls in the final hopper, small chips tend to fall first, so that the chip residue in the final hopper remains. As the amount decreases, the ratio of large chips increases, which causes raw material segregation. Therefore, in order to obtain a film roll with little variation in physical properties, it is necessary to match the shapes of the polyamide resin chip and the elastomer chip to suppress the phenomenon of raw material segregation in the final hopper.

  Polyamide raw material chips are usually formed in a molten state after polymerization in the form of strands from a polymerization apparatus, immediately cooled with water, and then cut with a strand cutter. For this reason, the polyamide chip has an elliptical column shape with an elliptical cross section. On the other hand, elastomer raw material chips are often formed in a disk shape having an elliptical cross section, and as a result of examining the relationship between the shape of polyamide chips and elastomer chips and raw material segregation, The average major axis (mm), average minor axis (mm), and average chip length (mm) are the average major axis (mm), average minor axis (mm), and average chip length of the cross-sectional ellipse of the polyamide resin raw material chip, respectively. The raw material segregation can be reduced by adjusting the thickness (mm) within a range of ± 25%. The average major axis, average minor axis, and average chip length of the cross-sectional ellipse of the elastomer chip are within ± 20% of the average major axis, average minor axis, and average chip length of the cross-sectional ellipse of the polyamide resin chip, respectively. Adjusting to the range is more preferable because the effect of preventing segregation becomes extremely remarkable.

(2) Moisture reduction at the time of resin chip drying The chip | tip supplied into each hopper is normally heated by apparatuses, such as a blender, and a water | moisture content is reduced. When drying such a chip, in the production of a polyester film roll or a polypropylene film roll, it is generally considered that the lower the moisture content during drying, the less hydrolysis in the extrusion process and the better the film roll is obtained. ing. However, as a result of studies by the present inventors, in the production of a polyamide-based mixed resin laminated film roll, it is difficult to stretch simply by reducing the moisture content at the time of drying, and a film roll having uniform physical properties can be obtained. It is not possible to obtain a film roll with uniform physical properties by controlling the moisture content within a predetermined range and securing a certain amount of moisture, so that it is appropriately plasticized without being hydrolyzed in the extrusion process. found. That is, in order to obtain the film roll of the present invention, it is necessary to control the moisture content of the polyamide resin chip and the thermoplastic elastomer chip to 800 ppm or more and 1000 ppm or less. When the moisture content of the chip exceeds 1000 ppm, hydrolysis is promoted when it is melted, the viscosity is lowered, the thickness unevenness in the longitudinal direction of the unstretched film is deteriorated, and the thickness unevenness in the longitudinal direction of the biaxially stretched film is deteriorated. Increase, fluctuations in physical properties and variations. On the contrary, if the moisture content of the chip is less than 800 ppm, the viscosity when melted becomes too high, and the film-forming property (easy to stretch) deteriorates. In addition, the optimal moisture content of the chip | tip supplied into a hopper is 850 ppm or more and 950 ppm or less.

(3) Temperature maintenance at the time of resin supply to each hopper As described above, even when the moisture content of the chip is adjusted to 800 ppm or more and 1000 ppm or less, the chip after heating and drying is left to stand at room temperature (room temperature). When the film is supplied to each hopper after lowering the thickness, a film roll having uniform physical properties cannot be obtained. That is, in order to obtain the film roll of the present invention, it is necessary to supply the chips heated and dried by a blender or the like to each hopper communicating with each extruder while keeping the temperature high. Specifically, the chips heated and dried by the blender need to be supplied to each hopper while being maintained at 80 ° C. or higher, and more preferably supplied to each hopper while being maintained at 90 ° C. or higher. When the temperature of the chip supplied to each hopper is lower than 80 ° C., the resin bite becomes worse, causing vertical thickness variation, physical property fluctuations and variations, and the film roll of the present invention cannot be obtained. In addition, when drying a chip | tip with apparatuses, such as a blender, it is necessary to adjust drying temperature to 150 degrees C or less. If the drying temperature exceeds 150 ° C., hydrolysis may occur during drying, which is not preferable. In addition, when the temperature of the chip heat-dried by the blender falls below 80 ° C., it is necessary to reheat the chip to 80 ° C. or higher and supply it to the hopper.

(4) Optimization of hopper shape By using a funnel-shaped hopper as the final hopper communicating with each extruder and making the inclination angle 65 ° or more, large chips can be easily dropped as well as small chips ( That is, the polyamide-based resin chip and the elastomer chip can be easily removed in the same manner), and the upper end portion of the contents descends while maintaining a horizontal plane, which is effective in reducing raw material segregation. A more preferable inclination angle is 70 ° or more, and an even more preferable inclination angle is 75 ° or more. The inclination angle of the hopper is an angle between the funnel-shaped hypotenuse and the horizontal line segment. A plurality of hoppers may be used upstream of the final hopper. In this case, in any hopper, the inclination angle needs to be 65 ° or more, more preferably 70 ° or more, and further preferably 75 °. That's it.

  It is also preferable to reduce the ratio of the fine powder generated due to the cutting of the raw material chips used in order to suppress fluctuations in the boiling water shrinkage rate. Since the fine powder promotes the occurrence of raw material segregation, it is preferable to remove the fine powder generated in the process and reduce the ratio of the fine powder contained in each hopper. The ratio of the fine powder contained is preferably within 1% by weight and more preferably within 0.5% by weight throughout the entire process until the raw material chips enter the extruder. As a specific method for reducing the fine powder ratio, the fine powder is removed by passing a sieve at the time of chip formation with a strand cutter or by passing a cyclone air filter when the raw material chips are air-fed. The method of doing can be mentioned.

(5) Addition of anti-segregation agent during resin mixing Furthermore, as a means of reducing raw material segregation in each hopper, a sublimation anti-segregation agent is added in the mixing of polyamide resin and elastomer in each hopper. It is also preferable to do. As such a sublimation segregation preventing agent, a low boiling glycol can be used, and among them, polyoxyethylene / polyoxypropylene glycol can be suitably used. The amount of the sublimation segregation inhibitor added to the polyamide resin raw material chip and the elastomer raw material chip is in the range of 0.02% to 2.00% with respect to the total weight of the polyamide resin and the elastomer. It is preferable to do this. If it is less than 0.02%, it is not preferable because a sufficient segregation preventing effect cannot be obtained. On the other hand, if it is 2.00% or more, there is a possibility that it cannot be completely sublimated.

  In addition, as a means for reducing the raw material segregation in each hopper, it is also a preferable means to optimize the capacity of the hopper used. Here, the proper capacity of each hopper is in the range of 15 to 120% by weight with respect to the discharge amount per hour of the extruder, and 20 to 100 weight with respect to the discharge amount per hour of the extruder. % Is more preferable.

  In addition, as a method of mixing the raw material chip of polyamide resin and the raw material chip of elastomer, it is also possible to supply to the final hopper and each extruder through an intermediate hopper (buffer hopper) for mixing.

  In addition, when mixing multiple types of raw materials, each as polyamide-based resin and elastomer, mixing is performed while quantitatively supplying multiple types of raw materials into each hopper from a device that continuously supplies quantitative raw material chips. Or a method of mixing in advance using a blender or paddle dryer, etc., but when using the latter, the raw material chip size is set so that the raw material segregation does not occur when the mixture is discharged. Is preferably reduced.

(6) Elimination of adverse effects due to addition of segregation inhibitor (suction when molten resin contacts metal roll)
When an unstretched film is obtained by melt-extrusion of the chip, the film is formed by melting the chips at a temperature of 200 to 300 ° C. with each extruder using a coextrusion method, laminating them, and extruding them from a T die. After forming (i.e., casting) into a laminated sheet form, it is rapidly cooled by a method of winding around a cooling roll such as a metal roll cooled to a predetermined temperature. In addition, the preferable melt extrusion temperature is 240 degreeC-290 degree | times from a viewpoint of the thickness variation of a vertical direction, the fluctuation | variation of physical properties, and dispersion | variation. In order to obtain the film roll of the present invention, when the molten resin is wound around the metal roll, the air gap (that is, the vertical distance from the exit of the T die lip to the chill roll surface) is adjusted to 20 to 60 mm, Using a suction device such as a vacuum box (vacuum chamber) with a wide suction port, the contact area between the molten resin and the surface of the cooling roll is sucked across the entire width of the molten resin in the direction opposite to the winding direction. By doing so, it is preferable that the molten resin is forcibly adhered to the metal roll.

  And in that case, in order to prevent the situation where the sublimation segregation preventing agent described above impedes the adhesion of the molten resin to the cooling roll, the suction air velocity at the suction port is set to 2.0 to 7.0 m / sec. Need to be adjusted to 2.5 to 5.5 m / sec. It is more preferable to adjust to. Furthermore, the vacuum box may have a series of suction ports, but the suction ports are divided into a predetermined number of sections in the lateral direction in order to facilitate adjustment of the suction air velocity at the suction ports. It is preferable that the suction air speed can be adjusted for each section. Further, when the casting speed is increased, an accompanying flow is generated with the rotation of the metal roll, and the adhesion of the molten resin to the metal roll is hindered. In order to improve the degree of adhesion of the metal roll to the metal roll, a wide shield plate made of a soft material such as Teflon (registered trademark) is installed on the upstream side adjacent to the suction device (the metal roll rotates relative to the suction device). It is preferable to install on the side opposite to the direction) to block the accompanying flow. Furthermore, in order to obtain the film roll of the present invention, it is necessary to suppress the variation in the suction wind speed of the vacuum box within ± 20% of the average suction wind speed (set value), and more preferably within ± 10%. . In addition, it is preferable to adjust the suction force by providing a filter in the vacuum box and feeding back the differential pressure before and after the filter so that the suction wind speed of the vacuum box does not fluctuate due to oligomer dust or the like.

  Moreover, in order to obtain the film roll of the present invention, when the molten resin is wound around the cooling roll, a DC negative charge of 90 to 105 mA is applied to the molten resin sheet at 2 to 15 kv from the needle electrode, It is necessary to continuously contact and quench the metal roll while glow discharge. In this case, it is preferable to adjust the DC negative charge to be applied in the range of 7 to 14 kv because vertical thickness variation, physical property fluctuations and variations are reduced. Further, in order to obtain the film roll of the present invention, it is necessary to suppress the variation of the DC negative charge to be applied within an average negative charge (set value) of ± 20%, more preferably within ± 10%. .

(7) Optimization of stretching conditions As a method of biaxially stretching an unstretched film, the unstretched film is stretched in the longitudinal direction with a roll-type stretching machine and stretched in the transverse direction with a tenter-type stretching machine, followed by heat setting treatment and relaxation. It is necessary to employ a longitudinal / lateral stretching method for performing the treatment. Furthermore, in order to obtain the film roll of the present invention, it is necessary to adopt a so-called longitudinal-longitudinal-lateral stretching method as a biaxial stretching method. The longitudinal-longitudinal-lateral stretching method means that, in longitudinal stretching of a substantially unoriented polyamide film, the first-stage stretching is performed, and the second-stage stretching is continuously performed without cooling to Tg or less. Thereafter, it is a method of transverse stretching at a magnification of 3.0 times or more, preferably 3.5 times or more, and further heat setting. And in order to obtain the film roll of this invention, when performing longitudinal-longitudinal-lateral stretching mentioned above, it is necessary to make the longitudinal stretch ratio of the 1st stage higher than the longitudinal stretch ratio of the 2nd stage. That is, by making the first stage longitudinal draw ratio higher than the second stage longitudinal draw ratio, it is possible to obtain a film roll with good physical properties such as boiling water shrinkage and few variations in those physical properties. It becomes. In addition, when performing longitudinal-longitudinal-lateral stretching, it is usually easier to make the first-stage longitudinal stretching ratio lower than the second-stage longitudinal stretching ratio without causing sticking to the roll during the first-stage stretching. However, by using a special roll such as a Teflon (trademark registered) roll, even if the longitudinal stretch ratio of the first stage is higher than the longitudinal stretch ratio of the second stage, it causes sticking to the roll. It becomes possible to stretch easily.

  When performing longitudinal-longitudinal-lateral stretching as described above, the first-stage longitudinal stretching is preferably stretched about 2.0 to 2.4 times at a temperature of 80 to 90 ° C. When the draw ratio at the first stage is out of the above range and becomes high, the thickness unevenness in the vertical direction becomes large, which is not preferable. In addition, the longitudinal stretching in the second stage is preferably stretched about 1.3 to 1.7 times at a temperature of 65 to 75 ° C. If the draw ratio of the second stage falls outside the above range, it becomes unfavorable because the boil distortion increases and becomes unpractical.On the other hand, if the draw ratio of the second stage goes out of the above range, it becomes high. The strength in the direction (such as strength at 5% elongation) becomes low and becomes unpractical.

  Moreover, when performing longitudinal-longitudinal-lateral stretching as described above, hot roll stretching, infrared radiation stretching, or the like can be employed as the longitudinal stretching method. In addition, when a film roll is produced by such a longitudinal-longitudinal-lateral stretching method, not only the thickness unevenness in the vertical direction, fluctuations in physical properties and variations are reduced, but also variations in physical properties and variations in the horizontal direction are reduced. be able to. In the case of longitudinal-longitudinal-lateral stretching, the total longitudinal stretching condition is preferably 3.0 to 4.5 times.

  Moreover, when performing longitudinal-longitudinal-lateral stretching, it is preferable to stretch the lateral stretching at a temperature of 120 to 140 ° C. by about 4.0 to 5.5 times. If the transverse stretching ratio falls outside the above range, the transverse strength (5% elongation strength, etc.) becomes low and impractical, which is not preferable. Conversely, the transverse stretching ratio falls within the above range. If the deviation is high, the thermal contraction rate in the lateral direction is increased, which is not preferable. On the other hand, if the transverse stretching temperature falls outside the above range, it becomes unpreferable because the boil distortion becomes large and becomes impractical, and conversely, if the transverse stretching temperature rises outside the above range, It is not preferable because the strength (strength at 5% elongation, etc.) decreases and becomes impractical.

  Furthermore, when obtaining a film roll by the manufacturing method of this invention, it is preferable to perform the heat setting process after longitudinal-longitudinal-lateral stretching at the temperature of 180-230 degreeC. If the temperature of the heat setting treatment falls outside the above range, the heat shrinkage rate in the longitudinal direction and the transverse direction increases, which is not preferable. On the contrary, if the temperature of the heat setting treatment rises outside the above range, biaxial stretching Since the impact strength of a film becomes low, it is not preferable.

  In addition, when a film roll is obtained by the production method of the present invention, the relaxation treatment after heat setting is preferably relaxed by 2 to 10%. If the rate of relaxation treatment falls outside the above range, the thermal contraction rate in the longitudinal direction and the transverse direction increases, which is not preferable. Conversely, if the rate of relaxation treatment falls outside the above range, the longitudinal direction and the width direction The strength (such as strength at 5% elongation) becomes low and becomes unpractical.

  Further, the width of the film roll is not particularly limited, but from the viewpoint of easy handling, the lower limit of the width of the film roll is preferably 0.35 m or more, and more preferably 0.50 m or more. . On the other hand, the upper limit of the width of the film roll is preferably 2.5 m or less, more preferably 2.0 m or less, and further preferably 1.5 m or less. In addition, the winding length of the film roll is not particularly limited, but the lower limit of the winding length of the film roll is preferably 500 m or more and more preferably 1,000 m or more from the viewpoint of ease of winding and handling. . On the other hand, the upper limit of the roll length of the film roll is preferably 2,5000 m or less, more preferably 20,000 m or less, and further preferably 15,000 m or less. In addition, when a film thickness is about 15 micrometers, it is especially preferable in it being 12000 m or less. In addition, as the winding core, usually, paper of 3 inches, 6 inches, 8 inches, etc., a plastic core or a metal core can be used.

  On the other hand, the thickness of the film constituting the polyamide-based mixed resin laminated film roll is not particularly limited. For example, the polyamide-based film for packaging is preferably 8 to 50 μm, and more preferably 10 to 30 μm.

  In addition, in the method for producing a polyamide-based resin film roll of the present invention, a lubricant, an anti-blocking agent, a heat stabilizer, an antioxidant, an antistatic agent, a light-proofing agent, and an improvement in impact resistance are provided as long as the properties are not impaired. It is also possible to contain various additives such as an agent. In particular, it is preferable to contain various inorganic particles for the purpose of improving the slipperiness of the biaxially stretched film. Moreover, it is preferable to add an organic lubricant such as ethylenebisstearic acid that exhibits the effect of reducing the surface energy because the slipping property of the film constituting the film roll becomes excellent.

  Furthermore, the polyamide-based mixed resin laminated film constituting the film roll can be subjected to a heat treatment or a humidity control treatment in order to improve the dimensional stability depending on the application. In addition, in order to improve the adhesion of the film surface, corona treatment, coating treatment, flame treatment, etc., and processing such as printing, vapor deposition and the like can be performed.

(8) Use of high-concentration raw material chip As described above, in order to improve the slipperiness of the biaxially oriented film under high humidity, various inorganic particles are contained in the polyamide-based resin, and the surface roughness of the film is increased. It is preferable to adjust, but in that case, good slipperiness under high humidity can be expressed by adding inorganic particles by a specific addition method. That is, when adding inorganic particles to a polyamide-based resin, a master batch in which high-concentration inorganic particles are added in advance to a polyamide-based resin, rather than adding powdered inorganic particles into an extruder and kneading. It is preferable to employ a method in which a polymer chip is prepared and the master chip (high-concentration raw material chip) is blended and diluted with a polyamide-based resin not containing inorganic particles. By adopting such means, the dispersibility of the inorganic particles is improved by rubbing the inorganic particles in the melt line, and as a result, it is considered to have a positive effect on the slipperiness under high humidity. .

  Moreover, when manufacturing a high concentration raw material chip | tip, it is preferable that the addition amount of the inorganic particle in a polyamide-type resin shall be 5-20 weight%, and it is more preferable to set it as 10-15 weight%. When the added amount of the inorganic particles exceeds 20% by weight, the dispersibility of the inorganic particles is lowered, and foreign matter may be formed in the film, which is not preferable. On the other hand, if the amount of inorganic particles added exceeds 5% by weight, it is not preferable because economic efficiency deteriorates. In addition, when preparing such a high-concentration raw material chip, the polyamide resin is previously powdered by a method such as pulverization in a cooled state, and then kneaded with inorganic particles, whereby the inorganic particle resin The dispersibility to the inside is improved, which is preferable.

(9) Adjustment of properties of inorganic particles When inorganic particles are added to the polyamide-based resin, the properties of the inorganic particles to be added to the polyamide resin constituting the skin layer are specified, so that the properties can be increased under high humidity. It is possible to exhibit good slipperiness. That is, as the inorganic particles to be added, those having an average particle size (that is, average particle size) of 0.5 to 5.0 μm are preferable, and silica particles are particularly preferable. If the average particle size is less than 0.5 μm, good slipperiness will not be obtained. Conversely, if the average particle size is more than 5.0 μm, transparency will be poor or so-called “missing” will occur during printing. This is not preferable. In addition, the measurement of the average particle diameter can employ a method of calculating the weight average diameter from the particle size distribution obtained by a Coulter counter, and can be measured from the particles before being added to the polyamide resin. It is also possible to measure from particles precipitated by dissolving the system mixed resin laminated film with an acid. The inorganic particles preferably have a pore volume of 0.5 to 2.0 ml / g, and more preferably 0.8 to 1.5 ml / g. When the pore volume is less than 0.5 ml / g, the transparency of the film deteriorates, which is not preferable. When the pore volume exceeds 2.0 ml / g, the slipperiness of the film deteriorates, which is not preferable. In addition, not only adding inorganic particles to the polyamide resin constituting the skin layer, but also adding a small amount of 0.001 to 0.005% by weight inorganic particles to the polyamide resin constituting the core layer, It is preferable because the slipperiness under humidity is significantly improved, and it is more preferable to add 0.002 to 0.004% by weight of inorganic particles. Moreover, it is preferable to make the particle diameter of the inorganic particles added to the core layer larger than the thickness of the skin layer because the slipping property under high humidity becomes more stable. The reason why the slipperiness under high humidity is stabilized is not clear, but the undulation action of the film surface by the inorganic particles in the core layer has a positive effect on the slipperiness under high humidity. I believe that.

(10) Adjustment of film lamination mode As described above, inorganic particles are added to the polyamide-based resin, and unevenness is formed on the surface of the film. In addition, by adjusting the lamination mode of the film, it is possible to exhibit good slipperiness even under high humidity. That is, in the production of the film roll of the present invention, a laminated film (laminated sheet) having a plurality of layer structures is formed by melt extrusion from a plurality of extruders using the coextrusion method as described above. However, at this time, it is preferable to adjust the discharge amount of the resin to be melt-extruded as a skin layer so that the final thickness of the skin layer after stretching is 0.5 to 4.0 μm. It is more preferable to adjust to 0.0 μm.

  In addition, at the time of formation of an unstretched laminated film, by using the means (1) to (5) and (7) to (10) described above, by using the means (6) in the stretching process of the unstretched laminated film, It becomes possible to reduce the uneven thickness of each layer constituting the laminated film, and consequently reduce the uneven thickness of the entire laminated film. And it is thought that it becomes possible to reduce the physical property fluctuation | variation of a film roll very efficiently resulting from that. In addition, any one of the above-described means (1) to (10) does not effectively contribute to the reduction of the physical property fluctuation of the film roll, and the means (1) to (10) are combined. Therefore, it is considered that the change in physical properties of the film roll can be reduced very efficiently. When forming an unstretched sheet (unstretched laminated sheet), as described above, the molten resin sheet is strongly electrostatically adhered to the cooling roll using streamer corona discharge to form a film at high speed. However, it becomes possible to reduce the physical property fluctuation | variation of a film roll.

  Moreover, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention has highly uniform characteristics in the winding direction. That is, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention cuts out a sample by the following method, measures the content of the thermoplastic elastomer component for each cut out sample, When the average content rate, which is an average value, is calculated, the variation rate of the content of the thermoplastic elastomer component of all the samples must be within a range of ± 10% with respect to the average content rate (claim) Item 1).

  In the cutting of the sample in the present invention, first, the first sample cutting portion is provided within 2 m from the end of winding of the film, and the final cutting portion is provided within 2 m from the beginning of winding of the film. A sample cut-out section is provided every about 100 m. Note that “about every 100 m” means that the sample may be cut out at about 100 m ± 1 m.

  More specifically, the cutting of the above sample will be described. For example, when a polyamide-based film having a length of 498 m is wound around a roll, the first sample (1) is taken within 2 m from the end of winding of the film. cut out. For convenience, the sample is cut out in a rectangular shape so as to have a side along the longitudinal direction of the film and a side along the direction orthogonal to the longitudinal direction (not cut diagonally). Subsequently, the second sample (2) is cut away from the cut portion at a distance of 100 m from the winding start side. In the same manner, the third sample (3) is separated to the winding start side of 200 m, the fourth sample (4) is separated to the winding start side of 300 m, and the fifth sample is separated to the winding start side of 400 m. Cut out (5). When the sample is cut out in this way, the remainder becomes shorter than 100 m, so the sixth (final) sample (6) cuts out any portion within 2 m from the start of film winding.

  And about each sample cut out as mentioned above, when the content of the thermoplastic elastomer component is quantitatively analyzed, and the average content rate that is the average value of those content rates is calculated, the thermoplastic elastomer component of all the samples That is, it is necessary that the fluctuation rate of the content of is within a range of ± 10% with respect to the average content. Here, the variation rate of the thermoplastic elastomer component content of all the samples is the maximum / minimum of the thermoplastic elastomer component content (measured value) of all the samples. It means the ratio of the difference with respect to the average content when the difference between the average content and the one with the larger difference from the average content is obtained. As will be described later, the content of the thermoplastic elastomer component is sliced perpendicular to the surface to form an ultrathin piece, and the elastomer component is dyed with a specific substance to occupy the entire dyed portion. It can be measured by a method of calculating the area ratio, or can be measured by other methods such as infrared analysis and NMR analysis focusing on a peak peculiar to the elastomer.

  The polyamide-based mixed resin laminated film roll obtained by the production method of the present invention preferably has a variation rate of the elastomer component content of all cut out samples within a range of ± 9% of the average content, More preferably within the range of ± 8%, and even more preferably within the range of ± 7%.

  In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is preferable as the variation rate of the elastomer component content of all the cut out samples is smaller, but the lower limit of the variation rate is the measurement accuracy. Considering 2% is considered the limit.

  Further, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention has a variation rate of thickness over the entire length in the longitudinal direction of ± 2% to ± 10% (± 2% or more ± 10%) with respect to the average thickness. It is necessary to adjust so as to be within the following range. Here, the variation rate of the thickness over the entire length in the longitudinal direction is the maximum / minimum of the thickness over the entire length in the longitudinal direction, and the difference between the average thickness of the maximum / minimum average thickness and the average thickness It means the ratio of the difference to the average thickness when the difference is obtained.

  That is, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, the difference between the maximum value Tmax of the thickness over the entire length in the longitudinal direction and the average thickness (the average thickness Ta over the entire length in the longitudinal direction) and the minimum value This means that both the difference between Tmin and the average thickness (Ta) must be within ± 10%.

  The polyamide-based mixed resin laminated film roll obtained by the production method of the present invention preferably has a variation rate of thickness over the entire length in the longitudinal direction within a range of ± 8% of the average thickness (Ta), ± 6% It is more preferable that it is within the range.

  In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is preferable as the variation rate of the thickness over the entire length in the longitudinal direction is smaller. However, the lower limit of the variation rate is 2 from the performance of the film forming apparatus. % Is considered the limit.

Moreover, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is an average which is an average value of the tensile elastic modulus when the tensile elastic modulus is measured for each sample cut out from each cut-out portion. The tensile modulus is 1.30 GPa (1300 N / mm ² ) or more and less than 2.50 GPa (2500 N / mm ² ), and the variation rate of the tensile modulus of all samples is ± 10 with respect to the average tensile modulus. % Must be adjusted within the range (claim 2). Here, the fluctuation rate of the tensile modulus of elasticity of all the samples is the maximum / minimum of the tensile modulus of elasticity of all the samples, and the larger of the difference between the average tensile modulus of the maximum / minimum It means the ratio of the difference to the average tensile elastic modulus when the difference from the average tensile elastic modulus is obtained.

  In addition, the tensile elastic modulus of the film constituting the polyamide-based mixed resin laminated film roll is important for improving the toughness and pinhole resistance of the film itself. If the tensile elastic modulus is less than 1.30 GPa, On the other hand, if the resistance to pinholes is insufficient and, on the other hand, it exceeds 2.50 GPa, tearing properties are deteriorated when a three-side sealed bag is used, which is not preferable. A more preferable range of the tensile elastic modulus is 1.50 GPa to 2.30 GPa in order to enhance toughness / pinhole resistance and tearability when forming a three-side sealed bag.

  The polyamide-based mixed resin laminated film roll obtained by the production method of the present invention preferably has a variation rate of the tensile elastic modulus of all cut out samples within a range of ± 9% of the average tensile elastic modulus. More preferably, it is in the range of 8% or less, and further preferably in the range of ± 7%.

  In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is preferable as the variation rate of the tensile elastic modulus of all the cut out samples is smaller, but the lower limit of the variation rate is based on measurement accuracy. We think about ± 2% is the limit.

  In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention has a rate of 40 cycles per minute using a gelbo flex tester for each sample cut out from each cut-out portion by the following method. Therefore, it is necessary that the number of pinholes when the bending test is continuously performed for 3000 cycles is adjusted to be 10 or less (claim 3).

[Measurement method of pinhole resistance]
A film laminated with a polyolefin film or the like and cut to a predetermined size (20.3 cm x 27.9 cm) is conditioned at a predetermined temperature and humidity for a predetermined time, and then the rectangular test film is wound. To form a cylindrical shape having a predetermined length. Then, both ends of the cylindrical film are fixed to the outer periphery of the disk-shaped fixed head of the gel bow flex tester and the outer periphery of the disk-shaped movable head, respectively, and the movable heads are parallel to the direction of the fixed head. Rotate a predetermined angle (440 °) while approaching a predetermined length (7.6 cm) along the axis, and then proceed straight ahead for a predetermined length (6.4 cm) without rotating, then reverse their movements A one-cycle bending test in which the movable head is returned to the initial position by being executed in the direction is continuously repeated for a predetermined cycle (3000 cycles) at a predetermined speed (40 cycles per minute). Thereafter, the number of pinholes generated in a predetermined range (497 cm ² ) excluding a fixed portion of the tested film and a portion fixed to the outer periphery of the movable head is measured.

  Moreover, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is the maximum of boiling water shrinkage in all directions by the following method for all samples when the samples are cut out by the above-described method. When the maximum boiling water shrinkage, which is a value, is measured, it is preferable that the average boiling water shrinkage, which is an average value of the maximum boiling water shrinkage, is adjusted to be 2% or more and 6% or less.

  In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention has a boiling water shrinkage in the +45 degree direction with respect to the longitudinal direction by the following method for all samples when the samples are cut out by the above-described method. When the boiling water shrinkage direction difference, which is the absolute value of the difference between the rate and the boiling water shrinkage rate in the -45 degree direction with respect to the longitudinal direction, is determined, the average boiling water shrinkage direction is the average value of the boiling water shrinkage direction differences. It is preferable that the difference is adjusted to 2.0% or less.

[Measuring method of boiling water shrinkage (BS), maximum boiling water shrinkage (BSx), average boiling water shrinkage (BSax), boiling water shrinkage direction difference (BSd), average boiling water shrinkage direction difference (BSad)]
The film cut out from each cut-out portion of the polyamide-based mixed resin laminated film roll is cut into a square shape and left in an atmosphere of 23 ° C. and 65% RH for 2 hours or more. A circle (about 20 cm in diameter) centered on the center of this sample is drawn, and a straight line passing through the center of the circle in the direction of 0 to 165 ° clockwise at 15 ° intervals, with the vertical direction (film drawing direction) being 0 °. Pull, measure the diameter in each direction, and make it the length before processing. The cut sample was then heat-treated in boiling water for 30 minutes, then removed and wiped off the moisture adhering to the surface, air-dried, and left in an atmosphere of 23 ° C. and 65% RH for 2 hours or more, as described above. The length of the straight line drawn in each diametric direction is measured and set as the length after treatment. BS (boiling water shrinkage), BSx (maximum boiling water shrinkage), BSax (average boiling water shrinkage), BSd (boiling water shrinkage direction difference) and BSad (average boiling water shrinkage direction difference) are calculated.
BS = [(length before processing−length after processing) / length before processing] × 100 (%)... 1
BSx = Maximum shrinkage rate (%) measured in 0 to 165 ° direction at 15 ° intervals 2
BSax = sum of BSx of all samples / number of samples 3
BSd = | (BS in 45 ° direction) − (BS in 135 ° direction) |
BSad = sum of BSd of all samples / number of samples 5

  The BSx value of the film constituting the polyamide-based mixed resin laminated film roll ensures heat resistance (also referred to as laminate strength or heat-resistant laminate strength) when the film is formed into a bag shape and subjected to hot water treatment. It is important to improve the toughness and pinhole resistance of the film itself. If the BSx value is less than 2%, the toughness and pinhole resistance will be insufficient. Or the heat-resistant laminate strength at the time of hot water treatment becomes insufficient. The range of BSx that is more preferable for enhancing toughness, pinhole resistance, laminating properties, and heat-resistant laminating strength is 3.5 to 5.0%.

  In addition, the BSd value of the film constituting the polyamide-based mixed resin laminated film roll has a great influence on the curling phenomenon that occurs during the boiling water treatment, and the larger the BSd value, the more easily the bag is bent and the curling becomes remarkable. If BSd is suppressed to 2.0% or less, preferably 1.5% or less, more preferably 1.2% or less, the bag warp during boiling water treatment is suppressed as much as possible, and the occurrence of S-curl phenomenon occurs. Can be prevented.

  Further, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, the variation rate of the maximum boiling water shrinkage (BSx) of all the cut out samples is ± 2% to ±± of the average boiling water shrinkage (BSa). It is preferable to adjust to be within a range of 10% (± 2% or more and ± 10% or less). Here, the variation rate of the maximum boiling water shrinkage (BSx) of all the samples is the maximum / minimum of the maximum boiling water shrinkage (BSx) of all the samples, and the average boiling water shrinkage of those maximum / minimum. It means the ratio of the difference with respect to the average boiling water shrinkage when the difference between the one with the larger difference between the ratio and the average boiling water shrinkage is obtained.

  That is, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, when the boiling water shrinkage of samples (1) to (6) is Xn (n = 1 to 6), the maximum value of Xn That is, it is preferable that both the difference between Xmax and the average boiling water shrinkage (BSax) and the difference between the minimum value Xmin and the average boiling water shrinkage (BSax) are within ± 10%, in other words , | BSax−Xn | (where || represents an absolute value) is preferably 10% or less.

  In the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, the variation rate of the maximum boiling water shrinkage (BSx) of all cut out samples is within ± 9% of the average boiling water shrinkage (BSa). It is more preferable that it is within the range, it is more preferable that it is within the range of ± 8%, and it is particularly preferable that it is within the range of ± 7%.

  In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is preferably as the variation rate of the maximum boiling water shrinkage (BSx) of all the cut out samples is smaller, but the lower limit of the variation rate is measured. Considering the accuracy, about 2% is considered the limit.

  Further, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, the fluctuation rate of the boiling water shrinkage direction difference (BSd) of all the cut out samples is ± 2 of the average boiling water shrinkage direction difference (BSad). % To ± 30% (± 2% or more and ± 30% or less) is preferably adjusted. Here, the fluctuation rate of the boiling water shrinkage direction difference (BSd) of all the samples is the maximum / minimum in the boiling water shrinkage direction difference (BSd) of all the samples, and the average of these maximum / minimum values. When the difference between the larger difference between the boiling water shrinkage direction difference and the average boiling water shrinkage direction difference is obtained, it means the ratio of the difference to the average boiling water shrinkage direction difference.

  That is, in the polyamide based mixed resin laminated film roll obtained by the production method of the present invention, when the boiling water shrinkage direction difference of the samples (1) to (6) is Yn (n = 1 to 6), It is preferable that both the difference between the maximum value Ymax and the average boiling water shrinkage direction difference (BSad) and the difference between the minimum value Ymin and the average boiling water shrinkage direction difference (BSad) are within ± 30%. In other words, | BSad-Yn | (where || indicates an absolute value) is preferably 30% or less.

  In the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, the fluctuation rate of the boiling water shrinkage direction difference (BSd) of all the cut out samples is ± 20 of the average boiling water shrinkage direction difference (BSad). It is more preferable that it is within the range of%, more preferably within the range of ± 15%, even more preferably within the range of ± 10%, and particularly preferably within the range of ± 8%.

  In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is preferably as the fluctuation rate of the boiling water shrinkage direction difference (BSd) of all the cut out samples is smaller, but the lower limit of the fluctuation rate is Considering the measurement accuracy, about 2% is considered the limit.

In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention has an average surface roughness ( SRa ) that is an average value of three-dimensional surface roughness (SRa) of all cut out samples from 0.01 to. It is preferably in the range of 0.06 μm, and more preferably in the range of 0.02 to 0.05 μm (an example of a method for measuring the three-dimensional surface roughness will be described in Examples). If the average surface roughness is less than 0.01 μm, good slipperiness under high humidity cannot be obtained, and on the contrary, if the average surface roughness is more than 0.06 μm, when laminating, Since adhesiveness with films, such as polyolefin, will fall, it is not preferred.

  Further, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, the variation rate of the three-dimensional surface roughness (SRa) of all cut out samples is ± 5% to the average surface roughness (SRaa). It is preferable to adjust to be within a range of ± 20% (± 5% or more and ± 20% or less). Here, the variation rate of the three-dimensional surface roughness (SRa) of all samples is the maximum / minimum of the three-dimensional surface roughness (SRa) of all samples, and the average of the maximum / minimum values. It means the ratio of the difference to the average surface roughness when the difference between the larger surface roughness and the average surface roughness is obtained.

  That is, in the polyamide-based mixed resin laminated film obtained by the production method of the present invention, when the three-dimensional surface roughness of the samples (1) to (6) is SRn (n = 1 to 6), In other words, it is preferable that the difference between the maximum value SRmax and the average surface roughness (SRaa) and the difference between the minimum value SRmin and the average surface roughness are within ± 20%. SRaa-SRn | (where || represents an absolute value) is preferably 20% or less.

  The polyamide mixed resin laminated film roll obtained by the production method of the present invention has a variation rate of three-dimensional surface roughness (SRa) of all cut out samples within ± 15% of the average surface roughness (SRaa). More preferably, it is more preferably within the range of ± 10%, and particularly preferably within the range of ± 8%. In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is preferably as the variation rate of the three-dimensional surface roughness (SRa) of all cut out samples is smaller, but the lower limit of the variation rate is Considering measurement accuracy, about 5% is considered the limit.

  In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention preferably has an average haze in the range of 1.0 to 4.0, which is an average value of the haze of all cut out samples. More preferably in the range of 5-3.0. If the average haze is more than 4.0, it is not preferable because the appearance of the formed bag is deteriorated when the bag making process is performed. Although the average haze is preferably as small as possible, the lower limit of the average haze is considered to be about 1.0 when the measurement accuracy is taken into consideration.

  Moreover, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention has a haze variation rate of ± 2% to ± 15% (± 2% or more and ± 15% or less) of the average haze of all cut out samples. ) Is preferably adjusted so as to be within the range. Here, the haze variation rate of all samples is the maximum / minimum of all samples in the haze, and the difference between the average haze and the larger of the maximum / minimum average hazes It refers to the ratio of the difference to the average haze when obtained.

  That is, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, when the haze of the samples (1) to (6) is Hn (n = 1 to 6), the maximum value Hmax of Hn And the average haze, and the difference between the minimum value Hmin and the average haze (Han) is preferably within ± 15%. In other words, | Han−Hn | , || represents an absolute value) is preferably 15% or less.

  The polyamide-based mixed resin laminated film roll obtained by the production method of the present invention preferably has a haze variation rate of all cut out samples within a range of ± 10% of the average haze, and within ± 8%. More preferably, it is in the range. In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is preferable as the haze variation rate of all the cut out samples is smaller, but the lower limit of the variation rate is 2% in consideration of measurement accuracy. I think the degree is the limit.

  On the other hand, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention has an average dynamic friction coefficient (μda) which is an average value of the dynamic friction coefficient (μd) at 23 ° C. × 80% RH of all cut out samples. It is preferably in the range of 3 to 0.8, and more preferably in the range of 0.4 to 0.6. When the average dynamic friction coefficient at 23 ° C. × 80% RH is less than 0.3, film misalignment occurs on the roll at the time of bag-making processing, which is not preferable, and conversely, the average dynamic friction coefficient is 0.8. Above the range, it is not preferable because good slipperiness under high humidity cannot be obtained.

  Moreover, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, the fluctuation rate of the dynamic friction coefficient (μd) of all the cut out samples is ± 5% to ± 30% (± 5%) of the average dynamic friction coefficient It is preferable to adjust to be within the range of ± 30% or less. Here, the fluctuation rate of the dynamic friction coefficient (μd) of all the samples is the maximum / minimum of the dynamic friction coefficients (μd) of all the samples, and is the difference between the average dynamic friction coefficient of the maximum / minimum. When the difference between the larger one and the average dynamic friction coefficient is obtained, it means the ratio of the difference to the average dynamic friction coefficient.

  That is, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, when the dynamic friction coefficient of the samples (1) to (6) is μn (n = 1 to 6), the maximum value of μn. That is, it is preferable that the difference between μmax and the average dynamic friction coefficient (μda) and the difference between the minimum value μmin and the average dynamic friction coefficient are within ± 30%. In other words, | μda−μn It is preferable that all of | (where || represents an absolute value) is 30% or less.

  In the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, it is more preferable that the variation rate of the dynamic friction coefficient (μd) of all the cut out samples is within ± 20% of the average dynamic friction coefficient. , More preferably within a range of ± 15%, and particularly preferably within a range of ± 10%. In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is preferable as the coefficient of variation of the dynamic friction coefficient (μd) of all the cut out samples is small, but the lower limit of the coefficient of variation is the measurement accuracy. Considering that, about 5% is considered the limit.

  On the other hand, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention has an average content in the range of 0.01 to 0.5% by weight, which is an average value of the content of inorganic particles of all cut out samples. And preferably in the range of 0.05 to 0.3% by weight (an example of a method for measuring the content of inorganic particles will be described in Examples). If the average content is less than 0.01% by weight, it is not preferable because good slipperiness under high humidity cannot be obtained. Conversely, if the average content exceeds 0.5% by weight, it is deleted in the manufacturing process. It is not preferable because it is difficult to recover and reuse the polyamide resin.

  Moreover, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, the variation rate of the inorganic particle content of all cut out samples is ± 2% to ± 10% (± 2% or more) of the average content It is preferable to adjust to be within a range of ± 10% or less. Here, the fluctuation rate of the inorganic particle content of all the samples is the maximum or minimum of the inorganic particle content of all the samples, and the difference between the average content of the maximum and minimum is the larger The ratio of the difference to the average content when the difference between the average content and the average content is obtained.

  That is, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, when the content of inorganic particles in the samples (1) to (6) is Cn (n = 1 to 6), Cn In other words, it is preferable that the difference between the maximum value Cmax and the average content (Ca) and the difference between the minimum value Cmin and the average content are within ± 10%. Ca-Cn | (where || indicates an absolute value) is preferably 10% or less.

  The polyamide-based mixed resin laminated film roll obtained by the production method of the present invention preferably has a variation rate of the inorganic particle content of all cut out samples within a range of ± 8% of the average content, More preferably, it is within the range of ± 6%. In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is preferable as the variation rate of the inorganic particle content of all the cut out samples is smaller. However, the lower limit of the variation rate considers the measurement accuracy. Then, about 2% is considered the limit.

Furthermore, when the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention cuts out the sample by the above method, the refractive index (Nz) in the thickness direction was obtained for all the samples. It is preferable that the average refractive index (Nza), which is the average value of the refractive indices, is adjusted to be 1.500 or more and 1.520 or less. The average refractive index is calculated by the following formula 6.
Nza = total Nz of all samples / number of samples 6

  In addition, the value of Nz of the biaxially oriented film constituting the polyamide-based mixed resin laminated film roll has a great influence on the film quality such as laminate strength and thickness unevenness. Therefore, the requirement that the average refractive index is 1.500 or more and 1.520 or less is an essential requirement when the biaxially oriented film is laminated with a polyolefin resin film. When Nz is less than 1.500, the laminate strength with the polyolefin resin film or the like becomes insufficient, and peeling between the laminate base material is likely to occur due to boiling water treatment after bag making. On the other hand, this Nz gradually decreases in the process of biaxially stretching an unstretched film (sheet). In other words, Nz can also be considered as one of the indices of stretching, and a large Nz indicates that stretching is insufficient. If Nz exceeds 1.520, it is due to insufficient biaxial stretching. Thick spots and the like appear remarkably, and satisfactory film quality cannot be obtained. Considering both the laminate strength and the film quality, a particularly preferable range of Nz is in the range of 1.507 to 1.516.

  Further, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, the variation rate of the refractive index (Nz) of all cut out samples is the average value of the refractive indexes (hereinafter referred to as the average refractive index). Is preferably adjusted to be within a range of ± 2%. Here, the variation rate of the refractive index (Nz) of all the samples is the maximum / minimum of the refractive indexes (Nz) of all the samples, and the difference between the average refractive index of the maximum / minimum values. When the difference between the larger one and the average refractive index is obtained, it means the ratio of the difference to the average refractive index.

  That is, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, when the refractive indexes of the samples (1) to (6) are Nz1 to Nz6, the maximum value Nzmax and the average refraction of Nz1 to Nz6 The difference between the refractive index and the difference between the minimum value Nzmin of Nz1 to Nz6 and the average refractive index is preferably within ± 2%. In other words, | average refractive index−Nz1 | The average refractive index -Nz6 | is preferably 2% or less. Further, in the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention, the variation rate of the refractive index (Nz) of all cut out samples is within ± 1% of the average refractive index. More preferred.

  In addition, the polyamide-based mixed resin laminated film roll obtained by the production method of the present invention is preferably as the variation rate of the refractive index (Nz) of all the cut out samples is smaller, but the lower limit of the variation rate is the measurement accuracy or From the viewpoint of machine accuracy, about 0.1% is considered the limit.

  As described above, the physical properties such as the tensile elastic modulus of the thermoplastic elastomer in one polyamide-based mixed resin laminated film roll are adjusted to values within a predetermined range, and the content of the thermoplastic elastomer, the tensile elastic modulus, etc. By reducing fluctuations in physical properties, it is possible to prevent deterioration in appearance during bag making and laminating, and it is possible to process smoothly with good yield even under high humidity. Pinhole resistance is extremely high and does not vary.

  Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited to the embodiments of the examples, and can be appropriately changed without departing from the spirit of the present invention. . Examples, Comparative Examples, Reference Examples, and Properties of Raw Material Chips A to I Used in Reference Comparative Examples, Compositions of Raw Material Chips A to I, Examples, Comparative Examples, Reference Examples, and Production of Film Rolls in Reference Comparative Examples The film conditions are shown in Tables 1 to 4, respectively. The chip A is composed of 99.85% by weight of nylon 6 (relative viscosity = 2.8, Tg = 41 ° C.) and 0.15% by weight of ethylene bis stearic acid amide. Also, nylon 6 (same physical properties as chip A) is 85.00% by weight, 15.0% by weight of silica particles having an average particle diameter of 2.0 μm and a pore volume of 0.8 ml / g. In addition, the shapes of the chips A to C are all elliptic cylinders, and the chips A and B have the same cross-sectional major axis, cross-sectional minor axis, and chip length. Chips D and I are made of a copolymer of nylon 12 and PTMG (polytetramethylene glycol) (relative viscosity = 2.0), and chip E is made of nylon 6 and PEG (polyethylene glycol). The chip F is made of an ethylene / methacrylic acid copolymer (MFR (Melt Flow Rate) at 190 ° C. = 2.4 g / 10 minutes). Chip G is made of an ethylene / butene copolymer (MFR = 2.0 g / 10 minutes), and Chip H is made of an ethylene ionomer (MFR = 2.4 g / 10 minutes). is there. In addition, the shapes of the chips D to I are all elliptic cylinders, and the chips D to H have the same cross sectional major axis, sectional minor axis, and chip length.

[Example 1]
Using a co-extrusion method, a polyamide-based mixed resin is melt-extruded (laminated in a die and extruded) from three extruders (first to third extruders), and turned to a rotating metal roll cooled to 17 ° C. By winding and quenching, an unstretched film (polyamide-based resin laminated sheet) having a thickness of 257 μm and a two-layer / three-layer structure was obtained. The method for forming each layer of the unstretched film (steps until melt extrusion) is as follows. In the following description, the first layer, the second layer, and the third layer are referred to in order from the surface layer of the polyamide-based mixed resin laminated sheet (that is, the surface of the third layer is a metal roll contact surface).

-Formation of first layer (outer layer) The chips A, B and D described above were separately dried using a 15 kl blender apparatus while heating to about 120 ° C for about 8.0 hours. When a predetermined amount of each chip was collected from the blender and the moisture content was measured, the moisture content of chips A, B, and D were all 800 ppm. The moisture content was measured using a Karl Fischer moisture meter (MKC-210 manufactured by KYOTO Electronics) under the conditions of a sample weight of 1 g and a sample heating temperature of 230 ° C.

  And each chip | tip in each blender after preliminary drying was continuously supplied separately into the mixing mixer with the fixed screw feeder. The supply amount of chip A was 96.5% by weight, the supply amount of chip B was 0.5% by weight, and the supply amount of chip D was 3.0% by weight. In addition, polyoxyethylene / polyoxypropylene glycol (Newpol PE-64 manufactured by Sanyo Chemical Co., Ltd.) is used as the sublimation segregation preventing agent in the hopper to which the chips A and B are supplied. It added so that it might become 1000 ppm with respect to the total weight of.

  Thereafter, the mixed raw materials of chips A, B, and D mixed in the mixing mixer as described above were continuously and separately supplied to the hopper immediately above the extruder (first extruder) with a quantitative screw feeder. The hopper had a capacity of 150 kg of raw material chips. The inclination angle of the hopper was adjusted to 70 °.

  Further, when the chips A, B, and D were supplied into the hopper via the mixing mixer, they were supplied to the hopper within a short time after drying so that the temperature of each chip would not be too low. The temperatures of chips A, B, and D immediately before being supplied to the hopper were all about 91 ° C. Then, the supplied chips A, B, and D (mixed ones) were melt-extruded from a T die at 270 ° C. by a single-screw first extruder.

-Formation of second layer (intermediate layer) Chips A, B, and D in each blender dried as described above were continuously and separately fed into the mixing mixer with a quantitative screw feeder. The supply amount of chip A was 96.97% by weight, the supply amount of chip B was 0.03% by weight, and the supply amount of chip D was 3.0% by weight. In addition, polyoxyethylene / polyoxypropylene glycol (Newpol PE-64 manufactured by Sanyo Chemical Co., Ltd.) is used as the sublimation segregation preventing agent in the hopper to which the chips A and B are supplied. It added so that it might become 1000 ppm with respect to the total weight of.

  Thereafter, the mixed raw materials of chips A, B, and D mixed in the mixing mixer as described above were continuously and separately supplied to the hopper immediately above the extruder (second extruder) with a quantitative screw feeder. The hopper had a capacity of 150 kg of raw material chips. The inclination angle of the hopper was adjusted to 70 °.

  Further, when the chips A, B, and D were supplied into the hopper via the mixing mixer, they were supplied to the hopper within a short time after drying so that the temperature of each chip would not be too low. The temperatures of chips A, B, and D immediately before being supplied to the hopper were all about 91 ° C. Then, the supplied chips A, B, and D (mixed ones) were melt-extruded from a T die at 270 ° C. by a single-screw second extruder.

-Formation of third layer (inner layer) Chips A, B, and D in each blender dried as described above were continuously and separately fed into the mixing mixer with a quantitative screw feeder. The supply amount of chip A was 96.5% by weight, the supply amount of chip B was 0.5% by weight, and the supply amount of chip D was 3.0% by weight. In addition, polyoxyethylene / polyoxypropylene glycol (Newpol PE-64 manufactured by Sanyo Chemical Co., Ltd.) is used as the sublimation segregation preventing agent in the hopper to which the chips A and B are supplied. It added so that it might become 1000 ppm with respect to the total weight of.

  Thereafter, the mixed raw materials of chips A, B, and D mixed in the mixing mixer as described above were continuously and separately supplied to the hopper immediately above the extruder (third extruder) with a quantitative screw feeder. The hopper had a capacity of 150 kg of raw material chips. The inclination angle of the hopper was adjusted to 70 °.

  Further, when the chips A, B, and D were supplied into the hopper via the mixing mixer, they were supplied to the hopper within a short time after drying so that the temperature of each chip would not be too low. The temperatures of chips A, B, and D immediately before being supplied to the hopper were all about 91 ° C. Then, the supplied chips A, B and D (mixed ones) were melt-extruded from a T die at 270 ° C. by a single-screw third extruder.

  In each extruder of Example 1, the average major axis, average minor axis, and average chip length of the thermoplastic elastomer chip (Chip D) are the average major axis and average of each polyamide-based resin chip (Chips A and B). Each of the minor diameter and the average chip length is included within a range of ± 20%. Moreover, the discharge amount of the 1st-3rd extruder in formation of an unstretched film was adjusted so that the thickness ratio of 1st layer / 2nd layer / 3rd layer might be 2/11/2.

  Then, the molten resin (polyamide resin and thermoplastic elastomer) extruded in a state of being laminated from the T-die through each extruder is wound around a rotating metal roll cooled to 17 ° C., and rapidly cooled. A non-stretched laminated sheet (unstretched laminated film) having a thickness of 257 μm was obtained. The take-up speed of the unstretched laminated sheet (rotational speed of the metal roll) is about 66 m / min. Met.

  In addition, the air gap when the molten resin is wound around the metal roll is adjusted to 40 mm, and a DC negative charge of 100 mA is melted at 11 ± 1.1 kv by a multi-needle electrode arranged in parallel with 1.5 mmφ needle-like bodies. The melted resin was electrostatically adhered to the metal roll by applying the streamer corona discharge to the resin (sheet-like material). In addition, in the streamer corona discharge described above, the periphery of the electrode and the metal roll is surrounded by a wall member and shielded from the outside, the humidity around the multi-needle electrode is kept at about 75% RH, and the periphery of the multi-needle electrode is Was maintained at about 45 ° C. Further, when the molten resin is wound around the metal roll, the portion where the molten resin comes into contact with the metal roll is opposite to the direction in which the resin is wound using the vacuum box over the entire width of the molten resin. By attracting in the direction, adhesion of the molten resin to the metal roll was promoted. The suction air velocity of the vacuum box is 5.0 ± 0.5 m / sec. Over the entire width of the suction port (that is, the entire width of the molten resin). It adjusted so that it might become. In addition, in manufacture of the above-mentioned unstretched film, adhesion of the oligomer to a multi-needle electrode was not seen, but the electrostatic contact state was very stable.

  Thereafter, the obtained unstretched film was longitudinally stretched (first longitudinal stretching) about 2.1 times at a stretching temperature of about 85 ° C. by a Teflon (registered trademark) roll, and then stretched at a stretching temperature of about 70 by a ceramic roll. Longitudinal stretching (second longitudinal stretching) was performed at 1.6 ° C. at about 1.6 times. Further, the longitudinally stretched sheet is continuously guided to a tenter, stretched by 4.0 times at about 130 ° C., heat-set at about 213 ° C., subjected to 5.0% transverse relaxation treatment, and then cooled. By cutting and removing both edges, a biaxially stretched film of about 15 μm was continuously formed over 2000 m to produce a mill roll. When the obtained biaxially stretched laminated film was sliced thinly in the thickness direction and observed with an electron microscope, the thicknesses of the first layer, the second layer, and the third layer were about 2 μm, about 11 μm, It was about 2 μm.

  In addition, the fluctuation range of the film surface temperature when the film is continuously produced 2000 m is the average temperature ± 0.8 ° C. in the preheating step, the average temperature ± 0.6 ° C. in the stretching step, and the average temperature ± 0.5 ° C. in the heat treatment step. It was in the range. Further, the obtained mill roll was slit into a width of 400 mm and a length of 2000 m, wound around a 3-inch paper tube, and two polyamide-based mixed resin laminated film rolls (slit rolls) were obtained. Then, using the obtained two slit rolls (namely, those obtained from the same mill roll), the characteristics were evaluated by the following method. In the following BS (boiling water shrinkage), BSx (maximum boiling water shrinkage), BSd (boiling water shrinkage direction difference), and refractive index measurement, the first sample cut-out portion is within 2 m from the end of film winding. Installed, the second to twentieth sample cutout sections are provided approximately every 100 m from the first sample cutout section, and the 21st sample cutout section is provided within 2 m from the beginning of film winding. A sample film was cut out from each of the sample cutout portions. The evaluation results are shown in Tables 6-10. When showing the evaluation results, for the impact strength and the laminate strength, the measured average values of the sample samples and the fluctuation range of the values of the sample samples were shown. For S-curl, the number of sample samples at each evaluation level and the overall evaluation level of all sample samples are shown.

[Boiling water shrinkage]
A biaxially oriented film (sample film) cut out from each cut-out portion of one slit roll was cut into a square shape with a side of 21 cm and left for 2 hours or more in an atmosphere of 23 ° C. and 65% RH. Draw a circle with a diameter of 20 cm centered on the center of the sample, draw a straight line passing through the center of the circle in the direction of 0 to 165 ° clockwise at 15 ° intervals, with the vertical direction (film drawing direction) being 0 °. The diameter in the direction was measured and taken as the length before treatment. The cut sample was then heat-treated in boiling water for 30 minutes, then removed and wiped off the moisture adhering to the surface, air-dried, and left in an atmosphere of 23 ° C. and 65% RH for 2 hours or more, as described above. The length of the straight line drawn in each diametric direction is measured and set as the length after treatment, and BS (boiling water shrinkage rate), BSx (maximum boiling water shrinkage rate), BSax (average boiling water shrinkage rate), BSd (boiling water shrinkage direction difference) and BSad (average boiling water shrinkage direction difference) were calculated.

  Then, the maximum / minimum in the maximum boiling water shrinkage (BSx) of all the samples is obtained, and the difference between the larger one of the maximum / minimum average boiling water shrinkage (BSax) and the average boiling water shrinkage And the ratio (%) of the difference to the average boiling water shrinkage (BSax) was calculated to obtain the variation rate of the maximum boiling water shrinkage (BSx) with respect to the average boiling water shrinkage (BSax). In addition, the maximum / minimum difference in boiling water shrinkage direction difference (BSd) of all samples is obtained, and the difference between the maximum / minimum average boiling water shrinkage direction difference (BSad) and the average boiling water shrinkage rate. The difference in boiling water shrinkage direction difference (BSd) with respect to the average boiling water shrinkage direction difference (BSad) is calculated by calculating the ratio (%) of the difference to the average boiling water shrinkage direction difference (BSad). The rate was determined.

[Three-dimensional surface roughness]
About the surface of the biaxially oriented film (sample film) cut out from each cutout portion of one slit roll, using a stylus type three-dimensional surface roughness meter (SE-3AK, manufactured by Kosaka Laboratory Ltd.), Under the conditions of a needle radius of 2 μm, a load of 30 mg, and a needle speed of 0.1 mm / s, the film was measured in the longitudinal direction of the film with a cut-off value of 0.25 mm over a measurement length of 1 mm, and divided into 500 points at intervals of 2 μm. Moreover, it measured over 0.3 mm of measurement length on the film width direction on the same conditions as the above, and it divided | segmented into 150 points | intervals at 2 micrometer intervals. The three-dimensional height of each of the obtained dividing points is analyzed using a three-dimensional roughness analyzer (manufactured by Kosaka Laboratory Ltd., TDA-21), and the three-dimensional average surface roughness (nm). )

[Dynamic friction coefficient in high humidity μd]
Using the biaxially oriented film cut out from each cut-out part of the slit roll, the dynamic friction coefficient between the outer layers was evaluated according to the following conditions in accordance with JIS-C2151.
Measurement atmosphere: 23 ° C., 80% RH
-Test piece: width 130mm, length 250mm
・ Test speed: 150mm / min

[Haze]
About each biaxially oriented film cut out from each cutout part of a slit roll, based on JISK7136, it measured using the haze meter (Nippon Denshoku Industries Co., Ltd. make, 300A). In addition, the measurement was performed twice and the average value was calculated | required.

[Content of inorganic particles]
Obtaining the weight of the residue when the biaxially oriented film cut out from each cut-out part of the slit roll is burned at 800 ° C., the ratio (percentage) of the residue weight with respect to the film weight before burning contains inorganic particles (silica) Calculated as a quantity. In the measurement of the content of the inorganic particles, the weight of the residue when the biaxially oriented film cut out from each cut-out portion is dissolved in a solvent such as sulfuric acid is obtained, and the ratio of the residue weight to the initial film weight ( It is also possible to employ a method of calculating (percentage).

[Vertical thickness unevenness]
The slit roll was slit to a width of about 3 cm over the entire length in the longitudinal direction to prepare a slit roll for thickness spot measurement. Thereafter, an average thickness, a maximum thickness, and a minimum thickness over the entire length in the longitudinal direction were determined using a thickness spot measuring device (wide range high sensitivity electronic micrometer K-313A) manufactured by Anritsu Corporation. And by calculating the difference between the average thickness and the larger one of the maximum thickness and the minimum thickness among the maximum thickness and the minimum thickness, and calculating the ratio (%) of the difference to the average thickness by the following formula 7. The variation rate of thickness over the entire length in the longitudinal direction was calculated.
Variation rate of thickness = | maximum thickness or minimum thickness−average thickness | / average thickness 7

[Refractive index]
Using an “Abbe refractometer 4T type” manufactured by Atago Co., Ltd., each sample film cut out from each sample cut-out part was left in an atmosphere of 23 ° C. and 65% RH for 2 hours or more, and then the refractive index in the thickness direction ( Nz) was measured. Also, the average average refractive index of all sample films is calculated, and as shown in Table 6, the difference between the maximum or minimum Nz and the average refractive index in all samples is calculated, and the ratio of the difference to the average refractive index is calculated. Was calculated as the rate of change.

[Impact strength]
Each sample film cut out from each cut-out part was allowed to stand in an atmosphere of 23 ° C. and 65% RH for 2 hours or more, and then a “film impact tester TSS type” manufactured by Toyo Seiki Seisakusho was used. The breaking strength was measured with a hemispherical impactor to determine the impact strength. The average impact strength of all sample films was also calculated.

[Content of elastomer component]
Each sample film cut out from each cut-out section is cut perpendicularly to the surface and perpendicular to the winding direction to produce an ultrathin section, and dyed with phosphotungstic acid and ruthenium oxide by the ultrathin piece method The sample was prepared. Thereafter, an electron micrograph (thickness direction: about 160 mm × winding direction: about 220 mm) was taken with a transmission electron microscope (JEM2010) manufactured by JEOL Ltd. at a magnification of 10,000 times. And the ratio which occupies for the whole area of the elastomer part dye | stained with phosphotungstic acid and ruthenium oxide using the image processing apparatus (analySIS) by JEOL Ltd. was computed as a content rate of an elastomer component.

[Tensile modulus]
Each sample film cut out from each cut-out part was sampled to a length of 150 mm and a width of 15 mm, and conditioned for 24 hours in an atmosphere of a temperature of 23 ° C. and a relative humidity of 50%. Then, under the conditions of a temperature of 23 ° C. and a relative humidity of 50%, in accordance with JIS K-7127, using an autograph AG-100E type manufactured by Shimadzu Corp. The tensile modulus was calculated as the ratio of the tensile stress within the tensile proportional limit and the corresponding strain.

[Lamination workability]
A biaxially oriented film constituting the slit roll using a slit roll (obtained from the same mill roll) different from the slit roll whose boiling water shrinkage rate, longitudinal thickness unevenness, refractive index, and impact strength were measured. After applying urethane-based AC agent ("EL443" manufactured by Toyo Morton Co., Ltd.) to the surface, an LDPE (low density polyethylene) film having a thickness of 15 µm was formed at 315 ° C using a single test laminator device manufactured by Modern Machinery. Further, an LLDPE (linear low density polyethylene) film having a thickness of 40 μm was continuously laminated thereon to obtain a laminate film roll having a three-layer structure composed of polyamide-based mixed resin / LDPE / LLDPE. . Moreover, the workability at the time of manufacturing a laminate film roll was evaluated in the following three stages. The temperature when the laminating property was evaluated was about 25 ° C., and the humidity was about 75% RH.
○: No wrinkle on the roll and condition adjustment is not required. Δ: Roll wrinkle is eliminated by condition adjustment. ×: No matter how the condition is adjusted, wrinkle is generated on the roll.

[Lamination strength]
In addition, the laminate film cut out from the laminate film roll was cut out into a width of 15 mm and a length of 200 mm as a test piece, and “Tensilon UMT-II-500 type” manufactured by Toyo Baldwin Co., Ltd. was used. The peel strength between the polyamide-based mixed resin laminated film layer and the LDPE layer was measured under conditions of a humidity of 65%. The tensile rate was 10 cm / min, the peel angle was 180 degrees, and water was added to the peeled portion for measurement. The laminate strength is measured by cutting out the first sample piece within 2 m from the end of winding of the laminate film roll, and cutting out the second to twentieth sample pieces every about 100 m from the cut out portion of the first sample piece. The 21st sample piece was cut out within 2 m from the beginning of winding of the film, and the measurement was performed on each of the first to 21st sample pieces. Moreover, the average of those measured values was also calculated.

[Pinhole resistance]
The laminated film cut out from the laminated film roll was cut into a size of 20.3 cm (8 inches) × 27.9 cm (11 inches), and the rectangular test film (laminated film) after the cutting was cut at a temperature of 23 ° C. Conditioning was allowed to stand for 24 hours or more under the condition of 50% relative humidity. Thereafter, the rectangular test film was wound into a cylindrical shape having a length of 20.32 cm (8 inches). Then, one end of the cylindrical film is fixed to the outer periphery of a disk-shaped fixing head of a gel bow flex tester (manufactured by Rigaku Kogyo Co., Ltd., NO.901 type) (conforming to the standard of MIL-B-131C). The other end of the tester was fixed to the outer periphery of a disk-shaped movable head of a tester facing the fixed head at a distance of 17.8 cm (7 inches). Then, the movable head is rotated 440 ° while approaching the fixed head in the direction of 7.6 cm (3.5 inches) along the axis of both heads opposed in parallel, and then 6.4 cm (without rotation) 2.5-inch) A one-cycle bending test in which the movement is performed in the reverse direction and the movable head is returned to the initial position is performed continuously for 3000 cycles at a rate of 40 cycles per minute. Repeated. Thereafter, the number of pinholes generated in a portion within 17.8 cm (7 inches) × 27.9 cm (11 inches) excluding the portion fixed to the outer periphery of the fixed head and movable head of the tested film was measured (ie, The number of pinholes per 497 cm ² (77 square inches) was measured).

[S-curl phenomenon]
The laminate film wound up as a laminate film roll as described above is folded into two parallel to the winding length direction using a test sealer manufactured by Seibu Machinery Co. Then, 10 mm in the vertical direction was intermittently heat-sealed at intervals of 150 mm to obtain a semi-finished product having a width of 200 mm. This was cut in the winding length direction and both edges were cut so that the seal portion was 10 mm, and then cut at the boundary of the seal portion in the direction perpendicular to this to produce a three-side seal bag (seal width: 10 mm). . From these three-sided sealing bags, a three-sided sealing bag made from a portion within 2 m from the end of winding of the laminate film roll is selected as the first sample, and about 100, 200,..., 1800, 3900 sealed bags produced from 1900 m apart were selected as the second to 20th samples, respectively, and 3 produced from the portion within 2 m from the start of the lamination film roll. A side seal bag was selected as the 21st sample. And after heat-treating those 21 three-way seal bags for 30 minutes in boiling water, hold them in an atmosphere of 23 ° C. and 65% RH all day and night. A load of 1 kg was applied to the entire surface of the bag, and the bag was removed after being held for a whole day and night, and the degree of bag curl (S-curl) was evaluated as follows.
◎: No warping at all. ○: Slight warping is observed. X: Warping is clearly observed. XX: Warping is remarkable.

[Example 2]
In the same manner as in Example 1, except that the take-up speed of the molten sheet was changed to 75 m / min and the temperature of heat setting after biaxial stretching was changed to about 216 ° C. Obtained. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 6-10.

[Example 3]
In forming the first layer and the third layer, when the chips A, B, and D in each blender are supplied to the hopper immediately above the first extruder and the third extruder through the mixing mixer, The supply amount is 96.0% by weight, the supply amount of the chip B is 1.0% by weight, the supply amount of the chip D is 3.0% by weight, and the chips in each blender are formed in the formation of the second layer. When A, B, and D are supplied to the hopper immediately above the second extruder via the mixing mixer, the supply amount of chip A is 96.94% by weight, and the supply amount of chip B is 0.06% by weight. And the supply amount of the chip D was set to 3.0% by weight. Other than that was carried out similarly to Example 1, and obtained the polyamide-type mixed resin laminated | multilayer film roll. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 6-10.

[Example 4]
When the raw material is melt-extruded from the first to third extruders to form an unstretched laminated sheet, the first layer / second layer / third layer has a thickness ratio of 1/13/1. A polyamide-based mixed resin laminated film roll was obtained in the same manner as in Example 1 except that the discharge amount of the third extruder was adjusted. When the obtained biaxially stretched laminated film was sliced thinly in the thickness direction and observed with an electron microscope, the thicknesses of the first layer, the second layer, and the third layer were about 1 μm, about 13 μm, It was about 1 μm. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 6-10.

[Example 5]
An unstretched film obtained in the same manner as in Example 1 was longitudinally stretched (first longitudinal stretching) about 2.2 times at a stretching temperature of about 90 ° C. by a Teflon (registered trademark) roll, and then by a ceramic roll. The film was stretched longitudinally (second longitudinal stretching) about 1.5 times at a stretching temperature of about 70 ° C. Further, similarly to Example 1, the longitudinally stretched sheet was continuously led to a stenter, stretched 4.0 times at about 130 ° C., and heat-set at about 213 ° C. After the relaxation treatment, the film was cooled and both edges were cut and removed to continuously form a biaxially stretched film of about 15 μm over 2000 m. The fluctuation range of the film surface temperature when the film was continuously produced was the same as in Example 1. The resulting film was slit and wound in the same manner as in Example 1 to obtain a polyamide-based mixed resin laminated film. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 6-10.

[Example 6]
The unstretched film obtained in the same manner as in Example 1 was longitudinally stretched in two stages in the same manner as in Example 1. Thereafter, the longitudinally stretched sheet is continuously guided to a stenter, transversely stretched 3.6 times at about 130 ° C., heat-set at about 216 ° C., and subjected to 3.0% lateral relaxation treatment. By cooling and cutting and removing both edges, a biaxially stretched film of about 15 μm was continuously formed over 2000 m. The fluctuation range of the film surface temperature when the film was continuously produced was the same as in Example 1. The resulting film was slit and wound in the same manner as in Example 1 to obtain a polyamide-based mixed resin laminated film. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 6-10.

[Example 7]
The polyamide system was the same as in Example 1 except that the raw material chips in the blender were supplied to the hoppers directly above the respective extruders (first to third extruders) except that the inclination angle of each hopper was changed to 65 °. A mixed resin laminated film roll was obtained. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 6-10.

[Example 8]
In forming the first layer and the third layer, when the chips A, B, and D in each blender are supplied to the hopper immediately above the first extruder and the third extruder through the mixing mixer, The supply amount is 89.5% by weight, the supply amount of chip B is 0.5% by weight, the supply amount of chip D is 10.0% by weight, and the chips in each blender are formed in the formation of the second layer. When A, B, and D are supplied to the hopper immediately above the second extruder through the mixing mixer, the supply amount of chip A is 89.97% by weight, and the supply amount of chip B is 0.03% by weight. The supply amount of chip D was 10.0% by weight. Other than that was carried out similarly to Example 1, and obtained the polyamide-type mixed resin laminated | multilayer film roll. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 6-10.

[Example 9]
In the formation of the first to third layers, the raw material chip E was used instead of the raw material chip D. In forming the first layer and the third layer, the chips A, B, and E in each blender are supplied to the hopper directly above the first extruder and the third extruder via the mixing mixer. The supply amount of A is 94.5% by weight, the supply amount of chip B is 0.5% by weight, the supply amount of chip E is 5.0% by weight, and in each blender, the second layer is formed. When the chips A, B, and E are supplied to the hopper immediately above the second extruder through the mixing mixer, the supply amount of the chip A is 94.97% by weight and the supply amount of the chip B is 0.03. The supply amount of chip D was 5.0% by weight. Other than that was carried out similarly to Example 1, and obtained the polyamide-type mixed resin laminated | multilayer film roll. In each extruder of Example 9, the average major axis, average minor axis, and average chip length of the thermoplastic elastomer chip (Chip E) are the average major axis and average of each polyamide-based resin chip (Chips A and B). Each of the minor diameter and the average chip length is included within a range of ± 20%. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 6-10.

[Example 10]
A polyamide-based mixed resin laminated film roll was obtained in the same manner as in Example 9 except that the raw material chip F was used instead of the raw material chip E. In each extruder of Example 10, the average major axis, average minor axis, and average chip length of the thermoplastic elastomer chip (Chip F) are the average major axis and average of each polyamide resin chip (Chips A and B). Each of the minor diameter and the average chip length is included within a range of ± 20%. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 6-10.

[Example 11]
A polyamide-based mixed resin laminated film roll was obtained in the same manner as in Example 9 except that the raw material chip G was used instead of the raw material chip E. In each extruder of Example 11, the average major axis, average minor axis, and average chip length of the thermoplastic elastomer chip (chip G) are the average major axis and average of each polyamide resin chip (chips A and B). Each of the minor diameter and the average chip length is included within a range of ± 20%. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 6-10.

[Example 12]
A polyamide-based mixed resin laminated film roll was obtained in the same manner as in Example 9 except that the raw material chip H was used instead of the raw material chip E. In each extruder of Example 12, the average major axis, average minor axis, and average chip length of the thermoplastic elastomer chip (Chip H) are the average major axis and average of each polyamide resin chip (Chips A and B). Each of the minor diameter and the average chip length is included within a range of ± 20%. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 6-10.

[Comparative Example 1]
When the molten resin is brought into electrostatic close contact with the metal roll, the electrode is changed to a wire of 0.5 mmφ while maintaining the rotation speed of the metal roll at about 66 m / min as in Example 1, and 11 ± 1. When a negative discharge of 100 mA at 1 kv is applied to the molten resin to cause glow discharge, the molten resin is wrapped around the wire and cannot be electrostatically adhered to the metal roll, and an unstretched film that can be stretched is obtained. I couldn't.

[Reference Example 1]
The resin sheet take-off speed (rotation speed of the metal roll) when the molten resin is electrostatically adhered to the metal roll is changed to 60 m / min, and the electrostatic adhesion method is a glow discharge using a 0.5 mmφ wire electrode (11 The polyamide system of Reference Example 1 was changed in the same manner as in Example 1 except that the temperature was changed to ± 1.1 kv and a DC negative charge of 100 mA was applied) and the temperature of heat setting after biaxial stretching was changed to about 210 ° C. A mixed resin laminated film roll was obtained. In addition, the fluctuation range of the film surface temperature when the film was continuously produced was, as in Example 1, the average temperature ± 0.8 ° C. in the preheating step, the average temperature ± 0.6 ° C. in the stretching step, and the average in the heat treatment step. The temperature was within the range of ± 0.5 ° C. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The manufacturing conditions of the film roll in Reference Example 1 are shown in Tables 11 to 13, and the evaluation results of the characteristics of the film roll are shown in Tables 14 to 18.

[Reference Example 2]
In forming the first layer and the third layer, when the chips A, B, and D in each blender are supplied to the hopper immediately above the first extruder and the third extruder through the mixing mixer, The supply amount is 96.0% by weight, the supply amount of the chip B is 1.0% by weight, the supply amount of the chip D is 3.0% by weight, and the chips in each blender are formed in the formation of the second layer. When A, B, and D are supplied to the hopper immediately above the second extruder via the mixing mixer, the supply amount of chip A is 96.94% by weight, and the supply amount of chip B is 0.06% by weight. And the supply amount of the chip D was set to 3.0% by weight. Otherwise in the same manner as in Reference Example 1, a polyamide-based mixed resin laminated film roll was obtained. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Example 3]
When the raw material is melt-extruded from the first to third extruders to form an unstretched laminated sheet, the first layer / second layer / third layer has a thickness ratio of 1/13/1. A polyamide-based mixed resin laminated film roll was obtained in the same manner as in Reference Example 1 except that the discharge amount of the third extruder was adjusted. When the obtained biaxially stretched laminated film was sliced thinly in the thickness direction and observed with an electron microscope, the thicknesses of the first layer, the second layer, and the third layer were about 1 μm, about 13 μm, It was about 1 μm. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Example 4]
The unstretched film obtained in the same manner as in Reference Example 1 was longitudinally stretched (first longitudinal stretching) about 2.2 times at a stretching temperature of about 90 ° C. by a Teflon (registered trademark) roll, and then by a ceramic roll. The film was stretched longitudinally (second longitudinal stretching) about 1.5 times at a stretching temperature of about 70 ° C. Further, as in Reference Example 1, the longitudinally stretched sheet was continuously led to a stenter, stretched 4.0 times at about 130 ° C., and heat-set at about 210 ° C. to be 5.0% in width. After the relaxation treatment, the film was cooled and both edges were cut and removed to continuously form a biaxially stretched film of about 15 μm over 2000 m. The fluctuation range of the film surface temperature when the film was continuously produced was the same as in Reference Example 1. The obtained film was slit and wound in the same manner as in Reference Example 1 to obtain a polyamide-based mixed resin laminated film roll. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Example 5]
The unstretched film obtained in the same manner as in Reference Example 1 was stretched in two stages in the same manner as in Reference Example 1. After that, the longitudinally stretched sheet is continuously guided to a stenter, transversely stretched 3.6 times at about 130 ° C., heat fixed at about 215 ° C. and subjected to 3.0% lateral relaxation treatment. By cooling and cutting and removing both edges, a biaxially stretched film of about 15 μm was continuously formed over 2000 m. The fluctuation range of the film surface temperature when the film was continuously produced was the same as in Reference Example 1. The obtained film was slit and wound in the same manner as in Reference Example 1 to obtain a polyamide-based mixed resin laminated film roll. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Example 6]
The polyamide system is the same as in Reference Example 1 except that when the raw material chips in the blender are supplied to the hopper immediately above each extruder (first to third extruders), the inclination angle of each hopper is changed to 65 °. A mixed resin laminated film roll was obtained. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Example 7]
In forming the first layer and the third layer, when the chips A, B, and D in each blender are supplied to the hopper immediately above the first extruder and the third extruder through the mixing mixer, The supply amount is 89.5% by weight, the supply amount of chip B is 0.5% by weight, the supply amount of chip D is 10.0% by weight, and the chips in each blender are formed in the formation of the second layer. When A, B, and D are supplied to the hopper immediately above the second extruder through the mixing mixer, the supply amount of chip A is 89.97% by weight, and the supply amount of chip B is 0.03% by weight. The supply amount of chip D was 10.0% by weight. Otherwise in the same manner as in Reference Example 1, a polyamide-based mixed resin laminated film roll was obtained. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Example 8]
In the formation of the first to third layers, the raw material chip E was used instead of the raw material chip D. In forming the first layer and the third layer, the chips A, B, and E in each blender are supplied to the hopper directly above the first extruder and the third extruder via the mixing mixer. The supply amount of A is 94.5% by weight, the supply amount of chip B is 0.5% by weight, the supply amount of chip E is 5.0% by weight, and in each blender, the second layer is formed. When the chips A, B, and E are supplied to the hopper immediately above the second extruder through the mixing mixer, the supply amount of the chip A is 94.97% by weight and the supply amount of the chip B is 0.03. The supply amount of chip D was 5.0% by weight. Otherwise in the same manner as in Reference Example 1, a polyamide-based mixed resin laminated film roll was obtained. In each extruder of Reference Example 8, the average major axis, average minor axis, and average chip length of the thermoplastic elastomer chip (Chip E) are the average major axis and average of each polyamide-based resin chip (Chips A and B). Each of the minor diameter and the average chip length is included within a range of ± 20%. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Example 9]
A polyamide-based mixed resin laminated film roll was obtained in the same manner as in Reference Example 8 except that the raw material chip F was used instead of the raw material chip E. In each extruder of Reference Example 9, the average major axis, average minor axis, and average chip length of the thermoplastic elastomer chip (Chip F) are the average major axis and average of each polyamide-based resin chip (Chips A and B). Each of the minor diameter and the average chip length is included within a range of ± 20%. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Example 10]
A polyamide-based mixed resin laminated film roll was obtained in the same manner as in Reference Example 8 except that the raw material chip G was used instead of the raw material chip E. In each extruder of Reference Example 10, the average major axis, average minor axis, and average chip length of the thermoplastic elastomer chip (chip G) are the average major axis and average of each polyamide-based resin chip (chips A and B). Each of the minor diameter and the average chip length is included within a range of ± 20%. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Example 11]
A polyamide-based mixed resin laminated film roll was obtained in the same manner as in Reference Example 8 except that the raw material chip H was used instead of the raw material chip E. In each extruder of Reference Example 11, the average major axis, average minor axis, and average chip length of the thermoplastic elastomer chip (Chip H) are the average major axis and average of each polyamide-based resin chip (Chips A and B). Each of the minor diameter and the average chip length is included within a range of ± 20%. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Comparative Example 1]
When forming an unstretched resin sheet, a single layer structure is formed without forming the first layer and the third layer, and in the formation of the second layer, chips A, B, and D in each blender are mixed with a mixing mixer. The supply amount of chip A is 96.5% by weight, the supply amount of chip B is 0.5% by weight, and the supply amount of chip D is 3. 0% by weight. Otherwise in the same manner as in Reference Example 1, a polyamide-based mixed resin laminated film roll was obtained. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Comparative Example 2]
A polyamide-based mixed resin laminated film roll was obtained in the same manner as in Reference Example 1 except that the raw material chip C was used instead of the raw material chip B. In Reference Comparative Example 2, the average major axis and the average chip length of the thermoplastic elastomer chip (Chip D) are respectively ± the average major axis and the average chip length of one polyamide-based resin chip (Chip C). It is not included in the range within 20%. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Comparative Example 3]
A polyamide-based mixed resin laminated film roll was obtained in the same manner as in Reference Example 1 except that the raw material chip I was used instead of the raw material chip D. In Reference Comparative Example 3, the average major axis and average chip length of the thermoplastic elastomer chip (Chip I) are the same as the average major axis and average chip length of each polyamide-based resin chip (Chips A and B), respectively. It is not included in the range within ± 20%. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Comparative Example 4]
The polyamide system is the same as in Reference Example 1 except that when the raw material chips in the blender are supplied to the hoppers directly above the respective extruders (first to third extruders), the inclination angle of each hopper is changed to 45 °. A mixed resin laminated film roll was obtained. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Comparative Example 5]
Reference Example 1 except that the raw material chips A, B and D were pre-dried and then left for about 5 hours in each blender before being fed to the hopper immediately above each extruder via a mixing mixer. Similarly, a polyamide-based mixed resin laminated film roll was obtained. The moisture content of chips A, B, and D immediately before being supplied to each hopper is 800 ppm, and the temperature of chips A, B, and D immediately before being supplied to each hopper is about 30 ° C. It was. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Comparative Example 6]
A polyamide-based mixed resin laminated film roll in the same manner as in Reference Example 1, except that the pre-drying conditions of the raw material chips A, B, and D were changed to a method of heating to about 100 ° C. over about 4.0 hours. Got. After preliminary drying, a predetermined amount of each chip was collected from each blender and the moisture content was measured. The moisture content of chips A, B, and D was all 1500 ppm, and each extruder was fed through a mixing mixer. The temperatures of chips A, B, and D immediately before being supplied to the hopper immediately above were about 85 ° C. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Comparative Example 7]
When supplying the raw material chips A, B, and D to the hopper immediately above each extruder through the mixing mixer, except that the segregation preventing agent was not added in each hopper, the same as in Reference Example 1, A polyamide-based mixed resin laminated film roll was obtained. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Reference Comparative Example 8]
An unstretched film obtained in the same manner as in Reference Example 1 was longitudinally stretched about 1.5 times (first longitudinal stretching) at a stretching temperature of about 90 ° C. with a Teflon (registered trademark) roll, and then with a ceramic roll. The film was stretched longitudinally (second longitudinal stretching) about 2.2 times at a stretching temperature of about 70 ° C. Further, the longitudinally stretched sheet is continuously guided to a stenter, and is stretched in the same manner as in Reference Example 1, thermally fixed and subjected to a lateral relaxation treatment, and then both edges are cut and removed. A biaxially stretched film of about 15 μm was continuously formed over 2000 m. The fluctuation range of the film surface temperature when the film was continuously produced was the same as in Reference Example 1. Thereafter, the resulting film was slit and wound in the same manner as in Reference Example 1 to obtain a polyamide-based mixed resin laminated film roll. And the characteristic of the obtained film roll was evaluated by the method similar to Example 1. FIG. The evaluation results are shown in Tables 14-18.

[Effects of manufacturing method of embodiment]
From Tables 6-10, in the manufacturing method of an Example, although the take-up speed | rate of a molten sheet is high (66m / min, 75m / min), the thickness unevenness of the vertical direction over the whole roll of the manufactured film roll is shown. It is understood that the fluctuation of physical properties such as elastomer content, tensile modulus, boiling water shrinkage, refractive index, and dynamic friction coefficient under high humidity is small. In addition, the film rolls according to the production methods of the examples with small variations in physical properties such as the elastomer content and the tensile elastic modulus do not cause the S-curl phenomenon, even under high humidity (75% RH). It can be seen that the laminate processability is good and the pinhole resistance variation is small. Furthermore, it can be seen that the films constituting the film rolls obtained in the examples have extremely high pinhole resistance, impact strength (toughness) and laminate strength. In contrast, in Comparative Example 1 in which glow discharge was performed without performing streamer corona discharge when the molten resin was electrostatically adhered to the metal roll, an unstretched film that could be stretched could not be obtained as described above. It was impossible to form a film at the same speed as in Example 1.

  Also, from Tables 14 to 18, the film rolls obtained in the reference examples all have very small longitudinal thickness unevenness over the entire roll, and the elastomer content, tensile elastic modulus, boiling water shrinkage, and refractive index. It can be seen that the variation in physical properties such as the coefficient of dynamic friction under high humidity is small. In addition, the film rolls of the reference examples having such small physical property fluctuations as the elastomer content and tensile elastic modulus do not cause the S-curl phenomenon, and are easy to laminate even under high humidity (75% RH). It is clear that the variation in pinhole resistance is small. Furthermore, it can be seen that the film constituting the film roll obtained in the Reference Example has extremely high pinhole resistance, and high impact strength (toughness) and laminate strength. On the other hand, the film roll obtained in the reference comparative example has thickness fluctuations in the vertical direction over the entire roll, elastomer content, tensile elastic modulus, boiling water shrinkage, refractive index, and dynamic friction coefficient under high humidity. It can be seen that the fluctuations in physical properties such as the above are large, the variation in pinhole resistance is large, the S-curl phenomenon is observed, and the laminate processability is poor.

  Since the production method of the present invention has an excellent effect in terms of productivity improvement as described above, it can be suitably used for production of a polyamide-based mixed resin laminated film roll. Moreover, since the polyamide-type mixed resin laminated | multilayer film roll obtained by the manufacturing method of this invention has the outstanding process characteristic as mentioned above, it can be used suitably for the retort processing use of foodstuffs.

It is explanatory drawing which shows the state by which an electrode is arrange | positioned at a moving cooling body and streamer corona discharge is performed.

Explanation of symbols

1 .. Dies 2. Sheet melt 3. Cooling drum 4. Unstretched sheet 5. DC high voltage power source 6. Electrode 7. Streamer corona discharge.

Claims (30)

A polyamide-based mixed resin laminated film obtained by laminating a plurality of polyamide-based resin sheets made of a mixed resin of a polyamide-based resin and a thermoplastic elastomer, has a width of 0.2 m to 3.0 m and a length of 300 m to 30000 m It is a manufacturing method of a polyamide-based mixed resin laminated film roll formed by winding so that
A melt extrusion cooling process for obtaining an unstretched sheet by melt-extruding and cooling a mixed resin of a polyamide-based resin and a thermoplastic elastomer into a sheet shape on the surface of a moving cooling body, and biaxially stretching the unstretched sheet in a longitudinal direction and a transverse direction A biaxial stretching step, and a winding step of winding the biaxially stretched biaxially stretched film into a roll,
The melt extrusion cooling step includes
During melt extrusion cooling of the mixed resin of the polyamide resin and the thermoplastic elastomer onto the moving cooling body surface, a corona in a streamer corona state is provided between an electrode applied with a direct-current high voltage and the polyamide mixed resin laminated sheet in the molten state. Discharging and giving a sufficient charge to adhere to the moving cooling body surface to the molten polyamide-based mixed resin laminate sheet,
A polyamide-based mixed resin laminated film wound up in a roll shape
A first sample cutout is provided within 2 m from the end of film winding, a final cutout is provided within 2 m from the start of film winding, and a sample cutout is provided approximately every 100 m from the first sample cutout. When manufacturing, the manufacturing method of the polyamide-type mixed resin laminated | multilayer film roll characterized by satisfy | filling the following requirements (1) and (2).
(1) When the content of the thermoplastic elastomer component is measured for each sample cut out from each cut-out portion and the average content rate, which is the average value of the content rates, is calculated, the thermoplasticity of all the samples The variation rate of the content of the elastomer component is within a range of ± 10% with respect to the average content rate. (2) The variation rate of the thickness over the entire length in the longitudinal direction of the wound roll is ± with respect to the average thickness. Within 2% to ± 10% A polyamide-based mixed resin laminated film obtained by laminating a plurality of polyamide-based resin sheets made of a mixed resin of a polyamide-based resin and a thermoplastic elastomer, has a width of 0.2 m to 3.0 m and a length of 300 m to 30000 m It is a manufacturing method of a polyamide-based mixed resin laminated film roll formed by winding so that
A melt extrusion cooling process for obtaining an unstretched sheet by melt-extruding and cooling a mixed resin of a polyamide-based resin and a thermoplastic elastomer into a sheet shape on the surface of a moving cooling body, and biaxially stretching the unstretched sheet in a longitudinal direction and a transverse direction A biaxial stretching step, and a winding step of winding the biaxially stretched biaxially stretched film into a roll,
The melt extrusion cooling step includes
During melt extrusion cooling of the mixed resin of the polyamide resin and the thermoplastic elastomer onto the moving cooling body surface, a corona in a streamer corona state is provided between an electrode applied with a direct-current high voltage and the polyamide mixed resin laminated sheet in the molten state. Discharging and giving a sufficient charge to adhere to the moving cooling body surface to the molten polyamide-based mixed resin laminate sheet,
A polyamide-based mixed resin laminated film wound up in a roll shape
A first sample cutout is provided within 2 m from the end of film winding, a final cutout is provided within 2 m from the start of film winding, and a sample cutout is provided approximately every 100 m from the first sample cutout. When manufacturing, the manufacturing method of the polyamide-type mixed resin laminated | multilayer film roll characterized by satisfy | filling the following requirements (3).
(3) For each sample cut out from each cut-out part, when the tensile elastic modulus in the winding direction of the film was measured, the average tensile elastic modulus, which is the average value of the tensile elastic modulus, was 1.30 GPa or more 2 Less than 50 GPa, and the variation rate of the tensile modulus of elasticity of all the samples is within ± 10% of the average tensile modulus. A polyamide-based mixed resin laminated film obtained by laminating a plurality of polyamide-based resin sheets made of a mixed resin of a polyamide-based resin and a thermoplastic elastomer, has a width of 0.2 m to 3.0 m and a length of 300 m to 30000 m It is a manufacturing method of a polyamide-based mixed resin laminated film roll formed by winding so that
A melt extrusion cooling process for obtaining an unstretched sheet by melt-extruding and cooling a mixed resin of a polyamide-based resin and a thermoplastic elastomer into a sheet shape on the surface of a moving cooling body, and biaxially stretching the unstretched sheet in a longitudinal direction and a transverse direction A biaxial stretching step, and a winding step of winding the biaxially stretched biaxially stretched film into a roll,
The melt extrusion cooling step includes
During melt extrusion cooling of the mixed resin of the polyamide resin and the thermoplastic elastomer onto the moving cooling body surface, a corona in a streamer corona state is provided between an electrode applied with a direct-current high voltage and the polyamide mixed resin laminated sheet in the molten state. Discharging and giving a sufficient charge to adhere to the moving cooling body surface to the molten polyamide-based mixed resin laminate sheet,
A polyamide-based mixed resin laminated film wound up in a roll shape
A first sample cutout is provided within 2 m from the end of film winding, a final cutout is provided within 2 m from the start of film winding, and a sample cutout is provided approximately every 100 m from the first sample cutout. When manufacturing, the manufacturing method of the polyamide-type mixed resin laminated | multilayer film roll characterized by satisfy | filling the following requirements (4).
(4) For each sample cut out from each cut-out part, the number of pinholes when a 3000-cycle bending test was continuously performed at a rate of 40 cycles per minute using a gelbo flex tester, All are 10 or less A polyamide-based mixed resin laminated film wound up in a roll shape
For each sample cut out from each cut-out part, when measuring the maximum boiling water shrinkage, which is the maximum value of the boiling water shrinkage in all directions, the average boiling water shrinkage is the average of those maximum boiling water shrinkage Is 2% to 6%, and the variation rate of the maximum boiling water shrinkage rate of all the samples is within a range of ± 2% to ± 10% with respect to the average boiling water shrinkage rate. The manufacturing method of the polyamide type mixed resin laminated | multilayer film roll in any one of 1-3. A polyamide-based mixed resin laminated film wound up in a roll shape
For each sample cut out from each cutout section, the boiling water shrinkage direction difference, which is the absolute value of the difference between the boiling water shrinkage rate in the +45 degree direction with respect to the longitudinal direction and the boiling water shrinkage ratio in the −45 degree direction with respect to the longitudinal direction, is calculated. When obtained, the average boiling water shrinkage direction difference, which is the average value of the boiling water shrinkage direction differences, is 2.0% or less, and the variation rate of the boiling water shrinkage direction difference of all the samples is the average boiling water difference. The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein the difference is within a range of ± 2% to ± 30% with respect to a difference in shrinkage direction. A polyamide-based mixed resin laminated film wound up in a roll shape
The manufacture of the polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein the following requirements (5) and (6) are satisfied for each sample cut out from each of the cutout portions: Method.
(5) When measuring the three-dimensional surface roughness in the winding direction, the average surface roughness, which is the average value of the three-dimensional surface roughness, is in the range of 0.01 to 0.06 μm, and all The variation rate of the three-dimensional surface roughness of the sample is in the range of ± 5% to ± 20% with respect to the average surface roughness. (6) When haze is measured, the average value of those hazes A certain average haze is in the range of 1.0 to 4.0, and the haze variation rate of all the samples is in the range of ± 2% to ± 15% with respect to the average haze. A polyamide-based mixed resin laminated film wound up in a roll shape
About each sample cut out from each said cut-out part, when measuring a dynamic friction coefficient in the atmosphere of 80% RH at 23 degreeC, the average dynamic friction coefficient which is the average value of those dynamic friction coefficients is 0.3-0.8. The dynamic friction coefficient of all the samples is within a range of ± 5% to ± 30% with respect to the average dynamic friction coefficient. The manufacturing method of the polyamide-type mixed resin laminated | multilayer film roll of description. A polyamide-based mixed resin laminated film wound up in a roll shape
About each sample cut out from each said cut-out part, when content of an inorganic particle is measured, the average content which is the average value of those inorganic particle content is in the range of 0.01 to 0.5 weight% And the variation rate of the inorganic particle content of all the samples is within a range of ± 2% to ± 10% with respect to the average content. The manufacturing method of the polyamide-type mixed resin laminated | multilayer film roll of description. A polyamide-based mixed resin laminated film wound up in a roll shape
For each sample cut out from each cutout portion, when the refractive index in the thickness direction was measured, the average refractive index, which is the average value of those refractive indexes, was 1.500 or more and 1.520 or less, and all The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein a variation rate of the refractive index of the sample is within a range of ± 2% with respect to the average refractive index. .   The wound polyamide-based mixed resin laminated film has an average particle size of the inorganic particles in a portion of 1/3 of the total thickness of the front and back surfaces, smaller than the average particle size of the inorganic particles in the portions other than the surface layers. The manufacturing method of the polyamide-type mixed resin laminated | multilayer film roll in any one of Claims 1-3 characterized by the above-mentioned.   The polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein the main component of the polyamide constituting the polyamide-based mixed resin laminated film wound up in a roll is nylon 6. Method.   The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein a polyamide-based mixed resin laminated film formed from a mixture of two or more different polyamide-based resins is wound up.   The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein the wound polyamide-based mixed resin laminated film is laminated with a polyolefin-based resin film.   It is characterized by winding a polyamide-based mixed resin laminated film obtained by extruding a melted polyamide-based resin from a T-die, bringing it into contact with a metal roll and cooling it, and stretching an unoriented sheet-like material biaxially. The manufacturing method of the polyamide-type mixed resin laminated | multilayer film roll in any one of Claims 1-3 to do.   The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein the polyamide-based mixed resin laminated film stretched by a tenter stretching method is wound up.   The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein the polyamide-based mixed resin laminated film that has been successively biaxially stretched is wound up.   The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein the polyamide-based mixed resin laminated film stretched biaxially in the vertical direction and the horizontal direction is wound up.   After stretching a sheet-like material composed of a substantially unoriented polyamide resin in the longitudinal direction in at least two stages so as to obtain a magnification of 3 times or more at a temperature higher than the glass transition temperature + 20 ° C. of the polyamide resin, The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein the polyamide-based mixed resin laminated film stretched in the lateral direction so as to have a magnification of 3 times or more is wound up.   The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein the polyamide-based mixed resin laminated film that has been heat-set after the final stretching treatment is wound up.   The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein the polyamide-based mixed resin laminated film which has been subjected to a relaxation treatment after heat setting is wound up.   At least one of a lubricant, an antiblocking agent, a heat stabilizer, an antioxidant, an antistatic agent, a light resistance agent, and an impact resistance improver is added to the wound polyamide-based mixed resin laminated film. The manufacturing method of the polyamide-type mixed resin laminated | multilayer film roll in any one of Claims 1-3 characterized by the above-mentioned.   The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein inorganic particles are added to the wound polyamide-based mixed resin laminated film.   The method for producing a polyamide-based mixed resin laminated film roll according to claim 22, wherein the inorganic particles are silica particles having an average particle size of 0.5 to 5.0 µm.   The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein a higher fatty acid is added to the wound polyamide-based mixed resin laminated film. A film forming step of forming an unstretched polyamide-based mixed resin laminate sheet by melt-extruding a mixed resin composed of a polyamide-based resin and a thermoplastic elastomer from a plurality of extruders by a coextrusion method;
A biaxial stretching step of biaxially stretching the unstretched polyamide-based mixed resin laminate sheet obtained in the film-forming step in the machine direction and the transverse direction,
The method for producing a polyamide-based mixed resin laminated film roll according to any one of claims 1 to 3, wherein the following requirements (a) to (f) are satisfied.
(A) In the film forming step, the polyamide resin chip and the thermoplastic elastomer chip are mixed and then melt-extruded, and the mixture of the polyamide resin chip and the thermoplastic elastomer chip is sublimated and segregated. (B) A polyamide-based mixed resin in which the film forming step is performed by mixing a polyamide-based resin chip and a thermoplastic elastomer chip and adding 0.1 to 2.0% by weight of inorganic particles. (C) The biaxial stretching step involves stretching in two stages in the longitudinal direction and then stretching in the transverse direction, and the first stage in the two-stage stretching in the longitudinal direction. (D) The film forming step includes a polyamide resin chip and a thermoplastic resin. It is melt extruded from each extruder after mixing with a steamer chip, and the shape of each chip used is an elliptical cylinder having an elliptical cross section having a major axis and a minor axis, and a thermoplastic elastomer The tip is adjusted to have an average major axis, an average minor axis, and an average tip length that are included within ± 25% of the average major axis, average minor axis, and average tip length of the polyamide resin chip, respectively. (E) The film forming step includes a step of melt extrusion using a plurality of extruders provided with a funnel-shaped hopper as a raw material chip supply unit, and all the inclination angles of the funnel-shaped hopper are 65 degrees or more. The moisture content of the polyamide resin chip before being supplied to the funnel-shaped hopper is 800 ppm or more and 1000 ppm or less. The temperature of the polyamide-based resin chip before being supplied to the funnel-shaped hopper is adjusted to 80 ° C. or higher. (F) The film forming step is performed simultaneously from the plurality of extruders. It includes a step of cooling by winding the polyamide-based mixed resin laminated sheet melt-extruded by an extrusion method around a cooling roll, and in that cooling step, the contact between the polyamide-based mixed resin laminated sheet and the surface of the cooling roll The part is sucked in the direction opposite to the winding direction by the suction device over the entire width of the polyamide-based mixed resin laminated sheet. A preheating step that is performed before the longitudinal stretching step, and a heat treatment step that is performed after the longitudinal stretching step,
The fluctuation range of the surface temperature of the film at an arbitrary point in the longitudinal stretching step, the preheating step, and the heat treatment step is adjusted within a range of an average temperature ± 1 ° C. over the entire length of the film. The manufacturing method of the polyamide-type mixed resin laminated | multilayer film roll in any one of Claims 1-3.   The streamer corona state corona discharge in the melt extrusion cooling step is performed between a multi-needle electrode applied with a DC high voltage and a polyamide-based mixed resin laminated sheet in a molten state. The manufacturing method of the polyamide-type mixed resin laminated | multilayer film roll in any one.   26. The film forming step is characterized by laminating a skin layer added with 0.05 to 2.0% by weight of inorganic particles on a core layer by using a high-concentration raw material chip. The manufacturing method of the polyamide-type mixed resin laminated | multilayer film roll of description.   26. The polyamide-based mixed resin laminated film according to claim 25, wherein the high-concentration raw material chip used in the film forming step is a polyamide-based resin chip to which inorganic particles are added in an amount of 5 wt% to less than 20 wt%. A method for manufacturing a roll. In the film forming step, the inorganic particles added to the polyamide-based resin sheet laminated on the outermost layer have a pore volume of 0.5 to 2.0 ml / g and an average particle size of 1.0 to 5.0 μm The method for producing a polyamide-based mixed resin laminated film roll according to claim 25.

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