KR20090008125A - Method for winding polyamide film - Google Patents

Abstract

A winding method of the polyamide film is provided that the generation of the wrinkle in the core part which is seen when reeling the polyamide film is prevented. A winding method of the polyamide film comprises as follows. The polyamide film(2) less than the width 1000mm is reeled in the cylindrical shape paper tube(1). The both ends of this cylindrical shape paper tube is supported as the cylindrical shape paper tube to the span of 1000mm to the horizontal direction. The bending of the central part is less 2mm and over 0.5mm when applying the load of 294N to the central part.

Description

Winding method of a polyamide film {METHOD FOR WINDING POLYAMIDE FILM}

TECHNICAL FIELD This invention relates to the winding-up method of a polyamide film. Specifically, It is related with the winding-up method of the polyamide film for winding up a polyamide film in the cylindrical branch pipe as a core.

Conventionally, a film is commercialized and shipped in the form wound up in roll shape. When winding up a film, a cylindrical paper tube and a plastic cylindrical tube are used as a core. However, especially in a polyamide film, since the moisture absorption property of a film is high, compared with the raw material with low hygroscopicity, such as a polyester film, a modulus of elasticity is low and the dimensional change by moisture absorption is large. For this reason, especially in a polyamide film, wrinkles generate | occur | produce in the core part easily, and there exists a problem that it is difficult to carry out appropriate winding.

For example, when winding up a polyester film, the method of winding up using the plastic core which made surface roughness a specific range is proposed (patent document 1). However, there are problems such as an increase in the transportation cost due to the increase in weight by the plastic winding core or an increase in the cost of the film roll due to the use of the expensive plastic winding core. In addition, when the plastic core is a defective product, there are many problems due to the close-up of the disposal problem. In the case of the polyamide film, the moisture absorption dimension change is generally large, and the glass transition temperature and the elastic modulus are lower than those of the polyester film. Therefore, the problem cannot be solved by using this method. .

As another winding method, Patent Document 2 proposes a method of winding a polyester film or the like using the paper pipe after setting the relationship between the flat compressive strength of the cylindrical paper pipe and the paper pipe thickness in a specific range. However, even if this is applied to a polyamide film, the formation factor of wrinkles is different, and the problem regarding generation | occurrence | production of wrinkles is not solved.

[Patent Document 1] Japanese Patent Application Laid-Open No. 61-162448

[Patent Document 2] Japanese Unexamined Patent Publication No. Hei 8-12196

The problem of this invention solves the above-mentioned problem, and prevents generation | occurrence | production of the wrinkle in the core part especially seen when winding a polyamide film using a conventional cylindrical paper tube after using an inexpensive cylindrical paper tube for core. It is an object of the present invention to provide a method of winding up a good polyamide film.

The winding method of the polyamide film of the present invention supports both ends of the cylindrical paper tube in the horizontal direction with a span of 1000 mm as the cylindrical paper tube when the polyamide film having a width of 1000 mm or less is wound on the cylindrical paper tube. The polyamide film is touched by using a cylindrical paper tube having a bending resistance of 2 mm or less at the center and 2 mm or less and a flat breakdown strength of at least 981 N / 100 mm when a load of 294 N is applied to the center. It winds up to a cylindrical branch pipe while pressing by a roll.

That is, the present invention focuses on the bending stiffness of the paper pipe to be used when the polyamide film is wound around the cylindrical paper pipe.

It has been said that it is preferable to use a cylindrical tube with a high rigidity, such as a hard vinyl chloride cylindrical tube, for winding cores. On the other hand, cylindrical paper tubes have the advantages of being lightweight and inexpensive, but they are not cylindrical tubular tubes that are retracted in the form of bows from the characteristics such as changes in moisture absorption dimensions of papers made of main materials or structural characteristics of winding papers in cylindrical form. It has the drawback that it is inevitable. It is common knowledge to form a "wrinkle" when the film is wrapped around a cylindrical tube in which the curl is generated. Therefore, it is important to select a branch tube having a small amount of curl in the past.

By the way, in the rewinder which winds up a film roll, the touch roll for pressurizing the surface of the film wound around the core is used for the purpose of preventing mixing of air to a film roll. MEANS TO SOLVE THE PROBLEM This inventor completed this invention by discovering that the pressing force of this touch roll can be used for the correction | amendment of a paper tube to the flipping and the bending. That is, the present invention utilizes a cylindrical paper tube having a low bending stiffness, and expresses the effect of correcting the curling or bending of the paper tube by the pressing force of the touch roll.

According to this invention, it is preferable that the length of a cylindrical paper tube is less than (width + 40mm of a film) in the above in order to suppress generation | occurrence | production of a wrinkle effectively.

(Effects of the Invention)

According to this invention, when winding up the film roll of a polyamide film, it is possible to use a cylindrical paper tube cheaper than a plastic core as a core, and it is possible to prevent a wrinkle from generate | occur | producing a film. Therefore, a film can be used satisfactorily even in the core part of a film roll, without causing a printing defect or a lamination defect in the process of printing the film wound in this way or laminating with another film.

Hereinafter, the present invention will be described in detail.

In the present invention, as the cylindrical paper tube, both ends of the cylindrical paper tube are supported in the horizontal direction with a span of 1000 mm, and the amount of warpage of the central portion when a load of 294 N (30 kgf) is applied to the central portion is 0.5 mm or more. A cylindrical branch pipe of 2 mm or less and having a flat breakdown strength of 981 N / 100 mm length (100 kgf / 100 mm length) or more is used.

And a polyamide film is wound up to a cylindrical paper pipe, pressing with a touch roll, such as a rubber roll. FIG. 1: shows the form which presses the film surface by the predetermined force by the touch roll 3, when winding up the polyamide film 2 around the cylindrical paper pipe 1. 4 is a take-up roll. By pushing the film 2 by the touch roll 3, it can suppress that air mixes between the film wound around the cylindrical branch pipe 1, and a film.

As described above, by using a cylindrical paper tube 1 of 2 mm or less in addition to the amount of warp when the load of 294 N (30 kgf) is applied to the center of the paper tube supporting both ends in a horizontal direction with a 1000 mm span, When the film is wound, but the amount of warping at that time is less than 0.5 mm, the rigidity of the paper tube 1 is so high that the pressing force of the touch roll 3 for preventing the mixing of air between the films is controlled by the bending and bending of the paper tube 1. The function of the present invention that it can be used for calibration is not obtained. On the other hand, in the case where the amount of warpage exceeds 2 mm, the stiffness of the paper pipe 1 is so low that even if the pressing force of the touch roll 3 is increased, the paper pipe 1 is generated so that the surface pressure due to the pressure of the touch roll 3 is increased. Without this improvement, the effect of preventing the mixing of air into the film roll by the touch roll 3 pressing the film 2 in the center portion of the cylindrical paper tube 1 is lost, and wrinkles caused by the mixed air are generated.

Moreover, the cylindrical branch pipe 1 needs the strength which can endure the external pressure by the wound film. Specifically, since the internal pressure of the roll increases due to the tension of the film wound in the roll shape, and the force acts in the direction in which the branch pipe 1 is compressed, the branch pipe 1 needs to have a predetermined breakdown strength. . For this reason, as mentioned above, it is necessary to use the cylindrical branch pipe 1 whose flat breakdown strength is more than 981N / 100mm length (100kgf / 100mm length).

Moreover, the problem of the rigidity of this branch pipe 1 and the problem of pressure-resistant strength are present in the winding start stage of the film 2 to the cylindrical branch pipe 1. After enclosing the film 2 to a certain extent or more in the thickness of the paper tube 1, the enveloping of the problem arises based on the mechanical strength of the paper tube 1 since the laminate itself of the film 2 becomes a rigid cylinder. Is solved.

The effect of this invention is expressed by the winding of the film roll whose film width is 1000 mm or less. When the film width exceeds 1000 mm, the effect of preventing the mixing of air into the film roll by pressing the touch roll 3 against the film 2 wound at the center portion of the cylindrical paper tube is lost, thereby forming wrinkles by the mixed air. It becomes easy to do it.

It is preferable that the length of the cylindrical branch pipe 1, ie, the surface length, is not less than the film width of the film 2 to be wound and is not more than (film width + 40 mm). It is more preferable that it is (film width + 20mm) or less. When the paper tube 1 with a large surface length is used compared with the width of the film 2 to be wound, the pressing force of the touch roll 3 is concentrated in the center portion of the cylindrical paper tube 1, and as a result, the touch roll 3 This is because not only the correction effect of the bending and the bending caused by this is lost, but also the result of increasing the amount of bending. This is because when the bending of the paper tube 1 due to the mass of the wound film 2 is generated and the amount of warpage increases, vibration occurs in the wound film roll, and after that, good winding becomes difficult.

The cylindrical paper tube in the present invention is, for example, a hard paper base paper wound in a spiral shape and processed into a cylindrical shape, and then cut into a desired length, the surface being polished, or a urethane resin, an unsaturated polyester resin, It is preferably used after the surface is blow-coated with alkyd resin or the like and polished. In order to reduce the influence by the moisture absorption after long-term storage, it is preferable that the cylindrical branch pipe uses the moisture proof material which consists of a metal film, an inorganic oxide film, or a moisture proof polymer film as a component for a part of base paper.

The load deflection and the flat breakdown strength of the cylindrical paper pipe are, for example, the type and composition of the paper wound in a spiral shape, the type of adhesive used, the thickness of the paper wrapped, and the width and width of the paper. The senses are changed by the helix angle. For this reason, the factor which determines the characteristic is complicated. For example, if the width of the paper to be wound is narrowed and the spiral angle is made gentle, the breakdown strength can be maintained high, and the amount of warpage can be increased. It is necessary to select and use the cylindrical branch pipe suitable for this invention.

In the present invention, the load deflection of the cylindrical branch pipe is obtained as follows under the same environment after placing the cylindrical branch pipe for which the load deflection is to be obtained for 48 hours in an environment of 23 ° C. and 50% RH. That is, as shown in FIG. 2, the load deflection is placed in the horizontal direction between the two support tables 5 and 5 with the cylindrical paper tubes 1 having a surface length of 1100 mm at intervals of 1000 mm. The dial gauge 6 is brought into contact with the upper portion of the center of the cylindrical branch pipe 1, and the string body 7 is wrapped around the center portion of the cylindrical branch pipe 1, and the end portion thereof is dropped downward to have a mass of 30 kg. It is calculated | required by measuring the bending amount (mm) when the force of 294N is made to act by embedding the weight 8 by the dial gauge 6. In addition, it is preferable to measure the amount of curvature (mm) in four places of 90 degree space | intervals along the circumferential direction of the branch pipe 1, and to employ | adopt the average value specifically ,.

In the present invention, the flat breakdown strength of the cylindrical paper tube is determined as follows in the same environment after placing the cylindrical paper tube for 48 hours in an environment of 23 ° C. and 50% RH as described above. That is, when graphing the relationship between the load strength and the amount of deformation when the cylindrical paper tube was cut in a 100 mm length and compressed in the radial direction at a speed of 30 mm / min from the upper side of the circumference of the cylindrical paper tube by the autograph. It is calculated | required by the load load in the primary inflection point of the straight line or curve obtained.

It is preferable that the polyamide film in this invention is a film which has the following polyamide resins as a main component. That is, as a polyamide resin, the polyamide resin obtained from the lactam of three or more rings, the polyamide resin obtained from the polymerizable ω-amino acid, the polyamide resin obtained by polycondensation, such as dibasic acid and diamine, etc. can be used. Specific examples thereof include polymers such as ε-caprolactam, aminocaproic acid, enanthlactam, 7-aminoheptanoic acid, 11-aminoundecanoic acid, 9-aminononanoic acid, α-pyrrolidone, and α-piperidone. And copolymers. In addition, diamines such as hexamethylenediamine, nonamethylenediamine, undecamethylenediamine, dodecamethylenediamine, and methaxylylenediamine, terephthalic acid, isophthalic acid, adipic acid, sebacic acid, dodecanedibasic acid, glutaric acid, etc. The polymer obtained by polycondensing the salt of dicarboxylic acid of these, or these copolymers are mentioned. For example, nylon 4, 6, 7, 8, 11, 12, 6, 6, 10, 6, 11, 6, 12, 6T, 6/6, 6, 6/12, 6 / 6T, 61 / 6T, etc. can be mentioned. For example, as a polyamide film provided for packaging use, it is preferable to have nylon 6 as a main component in terms of excellent mechanical properties and thermal properties.

The polyamide film in the present invention may further contain various additives, modifiers, and the like, which are usually blended as necessary. For example, lubricant, heat stabilizer, ultraviolet absorber, light stabilizer, antioxidant, antistatic agent, tackifier, sealant improver, antifog additive, crystal nucleating agent, mold release agent, plasticizer, crosslinking agent, flame retardant, coloring agent (pigment, dye, etc.) The compound etc. may be mix | blended.

In order to impart functionality to the film, the copper film may be stretched after coating an antistatic agent, an adhesion improving composition, a barrier resin, or the like on an unstretched polyamide film using an inline coat stretching technique.

The polyamide film may be a single layer film or may be a coextruded laminated film as long as the surface layer is a polyamide layer.

It is preferable that a polyamide film is a biaxially stretched polyamide film, and the biaxial stretching method can use a conventional method. For example, the flat method, the sequential drawing method, the tubular method, etc. can be used.

(Example)

EMBODIMENT OF THE INVENTION Below, this invention is demonstrated concretely by an Example. However, this invention is not limited to these, unless the summary is deviated.

Example 1

As a raw material of nylon 6, what contained 0.2 mass% of silica particles with an average particle diameter of 1.5 micrometers, and 0.05 mass% of ethylene bis stearamide as an additive was prepared. The raw material of nylon 6 was melt-extruded using an extruder and a T-die, and then wrapped in a casting drum to be solidified by cooling to prepare an unstretched sheet. This unstretched sheet was transferred to the hot water tank temperature-controlled at 70 degreeC, and the humidity control process for 1 minute was performed. Then, the edge part of the width direction of the sheet | seat was gripped by the clip of the flat simultaneous biaxial stretching machine, and simultaneous biaxial stretching was performed by the draw ratio of 3.0 times vertically and 3.3 times horizontally on the conditions of 195 degreeC. After that, heat treatment was performed at 200 ° C. for 3 seconds with a releasing rate of 5% in the transverse direction, and a biaxially stretched polyamide film disc having a width of 4 m and a thickness of 15 μm was obtained through a cooling step. This film master was wound up by the slitter at an acceleration of 200 m / min ² and a normal winding speed of 400 m / min to obtain a film roll having a width of 980 mm and a total length of 6000 m.

At this time, the winding tension of the film was 98.1 N / m (10.0 kgf / m), and the pressing force of the touch roll was 294 N / m (30 kgf / m). As the core, a cylindrical paper tube having an inner diameter of 76.5 mm, an outer diameter of 96.5 mm, a surface length of 990 mm, a warpage amount of 0.8 mm and a flat breakdown strength of 1.86 kN / 100 mm length (190 kgf / 100 mm length) was used.

Although the formation condition of the "wrinkle" during film winding was observed, generation | occurrence | production of a wrinkle was not seen. In addition, although the film was cut and confirmed, no wrinkles were seen.

Example 2

As the core, a cylindrical paper tube having an inner diameter of 76.5 mm, an outer diameter of 96.5 mm, a length of 990 mm, a deflection amount of 1.3 mm, and a flat breakdown strength of 1.47 kN / 100 mm length (150 kgf / 100 mm length) was used. Other than that was carried out similarly to Example 1, and the film roll was obtained. As a result, the generation | occurrence | production of the wrinkle in the film winding was not seen, and also the wrinkle was not seen even if it cuts and confirms.

Example 3

As the core, a cylindrical paper tube having an inner diameter of 76.5 mm, an outer diameter of 92.5 mm, a length of 990 mm, a deflection amount of 1.7 mm, and a flat breakdown strength of 1.27 kN / 100 mm length (130 kgf / 100 mm length) was used. Other than that was carried out similarly to Example 1, and the film roll was obtained. As a result, the generation | occurrence | production of the wrinkle in the film winding was not seen, and also the wrinkle was not seen even if it cuts and confirms.

Example 4

As the core, the inner diameter of 7640mm, outer diameter 92.5mm, length 650mm, bending amount 1.7mm, flat withstand strength 1.27kN / 100mm cylindrical paper tube length (130kgf / 100mm length) of 640mm in width, 6000m in total length The film was wound up. Other than that was carried out similarly to Example 1, and the film roll was obtained. The generation | occurrence | production of the wrinkle in the film winding was not seen, and also the wrinkle was not seen even if it cut and confirmed.

Comparative Example 1

As the core, a cylindrical paper tube having an inner diameter of 76.5 mm, an outer diameter of 96.5 mm, a length of 990 mm, a deflection amount of 2.3 mm, and a flat breakdown strength of 1.27 kN / 100 mm length (130 kgf / 100 mm length) was used. Other than that was carried out similarly to Example 1, and the film roll was obtained. As a result, since the amount of curvature of the cylindrical paper tube was larger than the range of this invention, wrinkles generate | occur | produced in the center part along the longitudinal direction of a roll from immediately after film winding start, and the wrinkles were not eliminated over the full length of a wound film.

Comparative Example 2

As the core, a cylindrical paper tube having an inner diameter of 76.5 mm, an outer diameter of 92.5 mm, a length of 990 mm, a deflection amount of 1.7 mm, and a pressure resistance of 0.88 kN / 100 mm in length (90 kgf / 100 mm in length) was used. Other than that was carried out similarly to Example 1, and the film roll was obtained. As a result, since the flat breakdown strength of the cylindrical paper tube was lower than the range of the present invention, the occurrence of wrinkles during the film winding was not observed, but as a result of cutting and confirming, the wrinkles were in the range of about 80 m from the start of the winding to the core, i.e. This was formed. In addition, part of the branch pipe was deformed.

Comparative Example 3

As the core, a cylindrical paper tube having an inner diameter of 76.5 mm, an outer diameter of 102.5 mm, a length of 990 mm, a deflection amount of 0.4 mm, and a flat breakdown strength of 2.35 kN / 100 mm length (240 kgf / 100 mm length) was used. Other than that, the film roll was obtained similarly to Example 1. As a result, since the warpage amount of the cylindrical paper tube was smaller than the range of the present invention, wrinkles were observed in the range of about 30 m after the start of film winding into the paper tube. As a result of cutting and confirming, wrinkles were formed in the range of about 90 m in the core part.

Reference Example 1

As a core, the cylindrical branch pipe of internal diameter 76.5mm, external diameter 96.5mm, length 700mm, curvature amount 0.8mm, and flat-pressure-resistant strength 1.86kN / 100mm length (190kgf / 100mm length) was used. Other than that was carried out similarly to Example 4, ie, the film was wound up using the cylindrical paper tube 60 mm longer than 640 mm which is a film width, and the film roll was obtained. As a result, the wrinkles generate | occur | produced almost immediately after the film winding start, and the wrinkles did not cancel over the whole length of the winding film.

The results of Examples 1 to 4, Comparative Examples 1 to 3, and Reference Example 1 are collectively shown in Table 1.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the winding method of the polyamide film of embodiment of this invention.

Fig. 2 is a diagram showing a method for determining the load deflection of the cylindrical branch pipe in the present invention.

(Explanation of symbols for the main parts of the drawing)

1: cylindrical paper tube 2: polyamide film

3: touch roll

Claims (2)

When the polyamide film having a width of 1000 mm or less is wound in a cylindrical paper tube, both ends of the cylindrical paper tube are horizontally supported with a span of 1000 mm as the cylindrical paper tube, and a load of 294 N is applied to the center thereof. The winding amount of the polyamide film is wound on the cylindrical paper tube while pressing the polyamide film with a touch roll using a cylindrical paper tube having a bending amount of not less than 0.5 mm and not less than 2 mm and a flat breakdown strength of not less than 981 N / 100 mm. The winding method of the polyamide film characterized by the above-mentioned. The method for winding a polyamide film according to claim 1, wherein the cylindrical paper tube has a length of (width + 40 mm of the film) or less.

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