JP2011051198A - Method and apparatus for manufacturing laminated film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a laminated film having a sealant layer containing a lubricant on at least one side of a substrate film which controls the slipperiness of the substrate film in a bag making process even when the content of the lubricant contained in the sealant layer is high and allows easy peeling of sealant layers in contact with one another in a filling process. <P>SOLUTION: The method for manufacturing a laminated film includes a process of delivering and carrying a rolled substrate film and a sealant film each and continuously, a process of applying a solvent to only one side of the sealant film delivered, a process of wiping away the solvent-applied surface and a process of adhering the sealant layer with the lubricant removed in the preceding cleaning processes to at least one side of the substrate film carried continuously. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for producing a laminated film having a sealant layer containing a lubricant on one surface of a base film, and controls the slipperiness between the sealant layer containing the lubricant and the surface of the base film. In addition, the present invention relates to a method and an apparatus for producing a laminated film capable of obtaining good processability and filling suitability.

  Bags that wrap all kinds of items such as food and drinks, pharmaceuticals, and daily goods are usually laminated on a base film with several types of layers that have various properties such as strength, light-shielding properties, barrier properties, and sealing properties. It is obtained by making a bag. Furthermore, an additive may be added to each layer in order to impart functionality. In particular, an additive is often added to the sealant layer which is the innermost layer in contact with the contents. Additives include antioxidants, lubricants, antiblocking agents, antistatic agents and the like.

  The laminated film used for packaging has a sealant layer on the inner surface, and is processed into a bag shape having an opening by thermocompression bonding (heat sealing) the sealant layers together by heat and pressure in a bag making process. The processed packaging bag is filled with the contents from the opening in the filling step, and further, the contents are sealed by thermocompression bonding (sealing) the sealant layers of the opening, and the product is shipped as a product.

  At this time, among the additives added to the laminated film, the lubricant is added in order to obtain the slipperiness of the film. The laminated film used for packaging is processed into a bag shape in the processing step, and the processed packaging bag is in a state where the sealant layers are in contact with each other. In filling the bag-like workpiece with the contents in the filling step, it is necessary to open the opening of the bag-like workpiece. At this time, a lubricant is added to the sealant layer in order to easily peel the contacted sealant layer.

  If the slipperiness of the film is not appropriate, problems may occur in the bag making process for processing a laminated film into a bag shape or the content filling process for filling a processed product processed into a bag shape. Specifically, if the amount of lubricant added to the sealant layer is increased, the amount of feed during the transport of the laminated film will vary in the bag making process, causing problems such as deviations in seal width and printing patterns. Arise. In addition, when the amount of lubricant added to the sealant layer is suppressed, the sealant layers are brought into close contact with each other in the content filling process, and the sealant layers cannot be easily separated from each other, and the opening of the bag-like workpiece is opened. It becomes impossible to make it.

  The laminated film is usually formed by a roll-to-roll method. A sealant layer is formed on a substrate film that is continuously conveyed, and the laminated film on which the sealant layer is formed is wound into a roll. At this time, when the laminated film on which the sealant layer is laminated is wound up in a roll shape, a part of the lubricant added to the sealant layer is transferred to the substrate film surface which is the back surface, thereby changing the slipperiness of the substrate film surface. At this time, when the slipperiness of the base film is large, the feeding amount of the laminated film varies, and problems such as a shift in the seal width and a shift in the printed pattern occur. This occurs particularly when the amount of lubricant added to the sealant layer is large.

The laminated film is formed by applying an adhesive on a base film by a roll-to-roll method and laminating it with a sealant film. At this time, when the amount of the lubricant added to the sealant film is increased, the amount of the lubricant that bleeds out to the surface of the sealant layer increases, which causes the adhesive strength to weaken and easily cause delamination.

  After the laminated film is formed by the roll-to-roll method, the laminated film remains in a roll shape and goes through an aging process for curing the adhesive and proceeds to a bag making process. Depending on the production convenience, it may be stored for a long time before proceeding to the bag making process. When the laminated film is stored in a roll shape, the amount of the lubricant added to the sealant layer transferred to the back surface of the base film is increased in proportion to the storage time. Therefore, when stored for a long time, there arises a problem that the slipperiness of the base film is increased.

  The lubricant is added to the resin, and when the film is formed, a part of the added lubricant moves (bleeds out) to the surface of the sealant film, thereby imparting slipperiness to the film. In order to stably control the slipperiness, a method of defining slipperiness by the winding pressure of the film (Patent Document 1), a film that prevents a decrease in slipperiness of the sealant layer (Patent Document 2), and the like have been proposed.

JP-A-11-334004 JP 2006-56146 A

  In the present invention, it is a laminated film having a film having a lubricant on both sides as a sealant layer, the adhesive strength between the base film and the sealant film is appropriate, and the film is stored in a roll shape for a long time. Another object of the present invention is to provide a method for producing a laminated film in which the slipperiness of the base film surface is suppressed in the bag making process and the filling suitability is good.

  In order to solve the above-mentioned problem, as an invention according to claim 1, in a method for producing a laminated film including a sealant layer containing a lubricant on at least one surface of a base film, a roll-shaped base film is fed out, A step of continuously conveying the film, a step of forming a sealant layer on at least one surface of the continuously conveyed base film, and a step of winding up the base film provided with the continuously conveyed sealant layer. It was set as the manufacturing method of the laminated film to make.

  Moreover, as invention which concerns on Claim 2, the process of apply | coating a cleaning solvent to the single side | surface of the film containing the lubricant used as a sealant layer, the process of scraping off the lubricant which exists on the film one side surface with a cleaning solvent after that, and remained The method for producing a laminated film according to claim 1, further comprising a step of drying the solvent.

  The invention according to claim 3 is the method for producing a laminated film according to claim 1 or 2, wherein the lubricant contained in the sealant layer is a fatty acid amide lubricant.

  The invention according to claim 4 is the method for producing a laminated film according to any one of claims 1 to 3, wherein the sealant layer is made of a polyolefin-based resin.

Moreover, as invention which concerns on Claim 5, it is a manufacturing apparatus used with the manufacturing method of the laminated | multilayer film of any one of Claims 1 thru | or 4, Comprising: For sending out a roll-shaped base film continuously A substrate film comprising: a winding mechanism; a laminating mechanism for laminating a sealant layer on at least one surface of a web-like substrate that is continuously conveyed; and a winding mechanism for winding the substrate film Before the lamination of the sealant film, the laminated film manufacturing apparatus is provided with a mechanism for removing the lubricant present on one side of the sealant film.

  In the laminated film produced by the production method of the present invention, the slipperiness of the substrate film surface is suppressed in the bag making process, and there is little variation in the feed amount of the laminated film, and the deviation of the seal width and the printed pattern It is possible to obtain a laminated film having excellent bag making suitability without causing defects such as slippage, and on the other hand, in the filling process, the contacted sealant layers can be easily separated from each other, and the laminated film has excellent filling suitability. We were able to.

FIG. 1 shows an explanatory sectional view of the laminated film of the present invention. FIG. 2 is an explanatory sectional view of another embodiment of the laminated film of the present invention. FIG. 3 is a schematic view of the laminated film production apparatus of the present invention. FIG. 4 is an explanatory sectional view of the laminated film of the present invention. FIG. 5 shows the relationship between (a) the coefficient of static friction and (b) the amount of erucamide relative to the number of storage days after aging in the examples. FIG. 6 shows the relationship between (a) the coefficient of static friction and (b) the amount of erucamide relative to the number of storage days after aging in the comparative example.

An embodiment of a laminated film (hereinafter also referred to as a laminated film of the present invention) obtained by the production method of the present invention will be described.
FIG. 1 shows an explanatory sectional view of the laminated film of the present invention. The laminated film (1) of the present invention includes a sealant layer (13) on one surface of the base film (11). Moreover, an adhesive layer (12) is provided between the base film (11) and the sealant layer (13). The sealant layer (13) contains a lubricant.

  FIG. 2 shows an explanatory sectional view of another embodiment of the laminated film of the present invention. In the laminated film of FIG. 2, the functional layer (14) is provided between the base film (11) and the sealant layer (13), and between the base film (11) and the functional layer (14). The adhesive layer (12) is provided between the functional layer (14) and the sealant layer (13).

  In this invention, as shown in FIG. 1, you may have an adhesive bond layer between a base film and a sealant layer. Moreover, as shown in FIG. 2, you may provide the functional layer between the base film and the sealant layer. Examples of the functional layer include a barrier layer having a water vapor barrier property or an oxygen barrier property for protecting contents, a printed layer capable of improving design properties, and the like. The functional layer is not limited to a single layer structure, and may have a structure in which a plurality of layers are stacked. Although not shown, a functional layer may be provided on the other surface where the sealant layer is not provided. For example, you may have functional layers, such as a printing layer, in the base film surface of the side in which the sealant layer is not provided.

  The base film (11) includes a polyester film such as a biaxially stretched polyethylene terephthalate film (PET film), a polyamide film such as a biaxially stretched nylon film (ONy film), and a polyolefin such as a biaxially stretched polypropylene film (OPP film). A better adhesive strength can be obtained by appropriately selecting from a film or the like, and applying a corona treatment or the like to the surface to which other layers are bonded.

  Moreover, as an adhesive agent used for an adhesive bond layer (12), a polyurethane type | system | group, a polyester type | system | group, a polyether type | system | group, and a mixture mainly having them are generally used. It is also possible to use an adhesive resin by an extrusion method. In this case, the resin is bonded by the sand lamination method, and the resins used include ethylene acrylic acid or methacrylic acid copolymer, ethylene acrylate or methacrylate copolymer, ethylene vinyl acetate copolymer, and modified maleic acid copolymer. . Note that the adhesive layer may be an anchor coat layer.

  The sealant layer (13) is a layer constituting the outermost surface of one surface of the laminated film, and the sealant layers can be bonded to each other by thermocompression bonding (heat sealing). That is, as the sealant layer forming material, a material that can be sealed with heat can be used. Specifically, polyethylene (PE) such as high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), and linear low density polyethylene (LLDPE), polypropylene (PP), polybutene, poly Examples include homopolymers such as methylpentene, and copolymers of two or more monomers selected from olefins such as ethylene, propylene, butene, and methylpentene, such as ethylene-propylene copolymers. It is also possible to use a mixture of

  The sealant layer (13) is formed by casting the above resin by a casting method, or extruding the resin into a tube shape by an inflation method, and blowing clean air into the extruded tubular film, so that both ends of the tubular film are on the production line. It is obtained by cutting the ears and winding them. It is also possible to use a film having a multilayer structure by co-extrusion of 2 to 3 types of resins as the sealant layer.

  The sealant layer includes a lubricant. As the lubricant contained in the sealant layer (13), fatty acid amide or alkylene bis fatty acid amide is preferably used. These are effective in obtaining slipperiness because they are easy to bleed out during film formation and have high transparency. Examples of fatty acid amides include stearic acid amide, oleic acid amide, erucic acid amide, and behenic acid amide, and alkylene bis fatty acid amides include methylene bis stearic acid amide, ethylene bis stearic acid amide, and ethylene bisolefinic acid amide. Etc. are used.

  The amount of lubricant added to the sealant layer resin is selected depending on the thickness of the sealant layer and the desired slip property. However, in the present invention, there is a problem even if there is a large amount of lubricant because the lubricant on one side is scraped off before the lamination. There is no. On the other hand, if the amount is too small, good slipperiness on the surface of the sealant layer is difficult to obtain, and the filling ability may be lowered. Therefore, in the case of a sealant layer film having a thickness of 50 μm to 150 μm, about 1000 ppm to 3000 ppm is preferable with respect to the resin weight.

  The thickness of the sealant layer (13) is usually selected in the range of 50 μm to 150 μm, but if the thickness is thin, the absolute amount of the lubricant is reduced accordingly, the slipperiness of the surface of the sealant layer is deteriorated, and the filling property is lowered. there is a possibility.

  As the functional layer (14), for example, an aluminum foil or a thin film made of a metal or a metal compound can be used as the barrier layer. The thickness of the aluminum foil is preferably 7 to 100 μm.

As a thin film forming material comprising a metal or a metal compound, any one of oxides, nitrides and fluorides of metals selected from magnesium, silicon, aluminum, tin, titanium, zinc, zirconium, calcium, nickel, etc., or 2 Among them, a mixture of seeds or more is mentioned. Among them, aluminum oxide or silicon oxide is more preferable because it is excellent in oxygen and water vapor gas barrier properties. The thickness of the metal aluminum, aluminum oxide or silicon oxide thin film layer is preferably about 1 to 300 nm. These metal thin films can be formed by a vacuum film forming method. As a vacuum film formation method, a vacuum deposition method, a sputtering method, an ion plating method, a plasma vapor deposition method (CVD), or the like can be used.

  Next, the manufacturing method and manufacturing apparatus of the laminated film of this invention are demonstrated.

  The laminated film of the present invention is produced by a roll-to-roll method. In FIG. 3, the schematic of the manufacturing apparatus of the laminated | multilayer film of this invention was shown.

  The laminated film manufacturing apparatus shown in FIG. 3 is an example of a dry laminating apparatus. The apparatus for producing a laminated film of the present invention is not limited to a dry laminating apparatus.

  In the laminated film manufacturing apparatus of the present invention, a roll-out base film (11) is provided with an unwinding mechanism (21) that is continuously conveyed. Next, an adhesive is applied to one surface of the base film continuously conveyed from the unwinding mechanism (21) by the adhesive applying mechanism (22). Next, the base film coated with the adhesive passes through the drying furnace (23), and is pasted in the laminating mechanism (26) via the sealant film and the adhesive continuously fed out by the unwinding mechanism (24). Combined to form a laminated film. The obtained laminated film is wound up by a winding mechanism (25).

  In the laminated film manufacturing apparatus of the present invention, the cleaning mechanism on the one side of the sealant film after the sealant film is fed from the unwinding mechanism (24) and then pasted to the base film by the laminating mechanism (26). (27). In the laminated film manufacturing apparatus of the present invention shown in FIG. 3, a mechanism (28) for applying the cleaning solvent only to the adhesive surface side of the sealant film immediately after the roll-like sealant film is sent out, and a mechanism for sending out the cleaning solvent (29) A mechanism (30) for scraping off the lubricant together with the cleaning solvent and a mechanism (31) for drying are provided.

  In the apparatus for producing a laminated film of the present invention, the lubricant on the adhesive surface side of the sealant layer is scraped off by a solvent, and immediately after drying, laminated with the base film and wound.

  As a cleaning means for the adhesive surface side of the sealant layer, any method may be used as long as the cleaning solvent can be applied only to one side, but preferably the cleaning solvent is applied by a roller method or by a spray method. It is done. The cleaning solvent is accompanied by a mechanism for sucking up with a pump or the like.

  As the cleaning solvent to be used, a solvent having a strong sealant layer and capable of dissolving the lubricant is preferable. When the lubricant is a fatty acid amide, alcohols such as methanol and ethanol are suitable.

  As a scraping mechanism after applying the solvent, the lubricant on one side of the sealant layer is removed together with the cleaning solvent using a doctor blade or a roller. The removed lubricant and solvent can be received in a saucer or the like. It is also preferable that the solvent received in the tray is purified by a solvent recovery device or the like and reused. At this time, it is preferable that the film is tilted because the cleaning solvent efficiently enters the tray.

  As shown in FIG. 3, the cleaning mechanism for the sealant layer is such that after the sealant layer is fed out, the cleaning solvent is applied from the lower side of the film and scraped off, so that the excess cleaning solvent can be easily collected in a tray or the like. After laundering, when laminating with the base film, the front and back sides are also changed with a guide roll so that it can be bonded to the washing surface side of the sealant film.

  As a drying mechanism, the remaining cleaning solvent can be dried by passing it through an air blow or an oven.

  In the laminated film manufacturing apparatus of the present invention, it is also preferable that a heating mechanism is provided between the laminating mechanism (26) and the winding mechanism (25) and in the winding mechanism (25).

  FIG. 4 is an explanatory sectional view of the laminated film of the present invention. FIG. 4A is an explanatory cross-sectional view of a roll-shaped laminated film wound up by a winding mechanism, and FIG. 4B is an explanatory cross-sectional view of a workpiece after the laminated film is made into a bag. is there.

  In the laminated film in the rolled state in FIG. 4A, the film is wound in a state where the sealant layer (13) and the base film (11) are in contact with each other. A part of the laminated sheet wound up is heat-sealed between the sealant layers (13) in the bag-making process to form a bag-like processed product having an opening. And a bag-like processed material will be in the state which sealant layers (13) contacted. The processed product after bag making is filled with the contents from the opening in the filling step, and finally the opening is heat-sealed and sealed.

  In the bag making process, bags are made by heat-sealing part of the sealant layers of the laminated film that is continuously conveyed. As shown in FIG. 4A, in the laminated film wound up in a roll shape, the sealant layer and the base film are in contact with each other, and the lubricant in the sealant layer is transferred onto the base film. When the lubricant moves to the surface of the base film, problems such as a shift in seal width and a shift in printed pattern occur in the bag making process. In particular, this is likely to occur when the amount of lubricant added to the sealant layer is large. Therefore, in the laminated film before the bag making process, it is preferable that the amount of lubricant transferred from the sealant layer to the base film is small.

  On the other hand, in the filling step, it is necessary to open the closed opening in order to fill the contents. At this time, as shown in FIG. 4 (b), the sealant layers are in contact with each other in the processed product, and in order to melt the contents, the contacted sealant layers are separated to open the opening. There is a need. When the amount of lubricant added to the sealant layer is small, it becomes impossible to separate the contacted sealant layers from each other in the filling step, and the filling suitability is lowered.

  As a result of intensive studies on the bleed-out behavior of the lubricant in the laminated film, the present inventors have found that the bleed-out amount of the lubricant can be controlled by the temperature. When the film temperature is low, a few percent of the amount of lubricant added bleeds out to the film surface, but when the film is heated, the amount of lubricant that bleeds out to the surface decreases, and the reduced lubricant is heated while heating. It was found that it was trapped inside the sealant layer. Moreover, after unwinding the laminated film, it was found that the lubricant bleeds out on the surface of the sealant layer when the laminated film temperature is lowered.

Furthermore, it has also been found that the bleed-out lubricant on the surface of the sealant layer has different bleed-out behavior between the case of the sealant film alone and the case where the sealant film is laminated with the base film through an adhesive. In the state of the sealant film alone, the lubricant is bleed out on the surfaces on both sides. In this state, when the base film and the adhesive are laminated, the lubricant present on the surface of one side of the sealant layer is fixed to the adhesive layer. Therefore, only the lubricant on the other side exhibits the slipperiness of the sealant layer, and is repeatedly confined within the sealant layer or bleed out to the surface as described above. Furthermore, the laminated film that has been laminated in a state where the lubricant of the sealant film to be bonded to the base film through the adhesive is removed in advance has a difference in bleed-out behavior compared to the laminated film that does not do this. I found. That is, the laminated film laminated in a state where the lubricant of the sealant film to be bonded to the base film through the adhesive is removed in advance does not have the lubricant fixed to the adhesive layer. In this state, the lubricant on the surface of the sealant of the laminated film is reduced as compared with the film without this. Furthermore, when the laminated film is heated, most of the lubricant on the other side of the sealant layer is taken into the adhesive layer where the lubricant is empty, so even if the laminated film temperature is lowered, the lubricant bleeds out to the surface of the sealant layer. It was found to be slower than a laminated film that did not do this.

  In this way, after removing the lubricant present on the surface of one side of the sealant layer in advance, the transfer of the lubricant to the base film is delayed after winding the laminated film and before the bag making process through the aging process. Therefore, it can be stored in a wound state for a long time. Further, even when a sealant with a large amount of lubricant is used, the amount of lubricant becomes about half at the stage of forming a laminated film, and the transfer of the lubricant to the base film can be reduced. Further, even when a sealant with a large amount of lubricant is used, it is expected that the adhesive strength is increased by removing the lubricant from the sealant film on the side in contact with the adhesive layer as compared with a laminated film in which this is not performed.

  Eventually, the lubricant bleeds out to the surface of the sealant layer, so that the filling ability is sufficiently obtained.

  That is, the present inventors have a small amount of lubricant transferred from the sealant layer to the base film, and the bag-making suitability does not deteriorate even when sufficient lubricant is added to the sealant layer in order to obtain filling suitability. The manufacturing method of the laminated | multilayer film was discovered.

  In the manufacturing method of the laminated film of the present invention, by providing a step of washing out the lubricant on one side after feeding out the sealant layer, the amount of lubricant on the surface of the sealant layer can be reduced at the time of winding, Even after winding, it can be confined within the sealant layer for a long time. Therefore, it can suppress that the lubricant in a sealant layer transfers to a base film, and it can be set as the laminated film which does not have a problem of the shift | offset | difference of a seal width | variety and the shift | offset | difference of a printing pattern in a bag manufacturing process of a post process.

  In addition, the laminated film of the present invention has a sufficient amount of lubricant remaining after the lubricant on one side of the sealant is washed, so that a sufficient amount of the lubricant bleeds out to open on the surface of the sealant layer in the filling process. Thus, a bag-like processed product having high filling suitability can be obtained.

  In the present invention, the lubricant contained in the sealant layer is preferably a fatty acid amide-based lubricant represented by erucic acid amide. The fatty acid amide-based lubricant can easily control the amount of lubricant on the surface of the sealant layer by the method for producing a laminated film of the present invention.

  Examples of the present invention are shown below, but the present invention is not limited to the scope of these Examples.

Example 1
A base film having a multilayer structure of nylon film (thickness 20 μm) / barrier layer (aluminum foil (material)) was prepared. On the other hand, as a sealant layer, erucic acid amide is added as a lubricant at 1000 ppm with respect to the resin weight, and the film thickness produced by the casting method is 1
00 μm polypropylene was used. And the laminated film was manufactured using the dry laminating apparatus as shown in FIG. A polyurethane-based adhesive was used as the adhesive, and a sealant layer made of polypropylene was formed on the barrier layer side of the base film. In the dry laminating apparatus, ethanol as a cleaning solvent was applied to one side of the sealant layer by a spray method, and the lubricant was scraped off together with the solvent by a doctor blade and dried, and then laminated with the base film.

  Immediately after completion of winding, the film was conveyed to an aging chamber and subjected to aging for curing the adhesive at 45 ° C. for 24 hours. Then, after storing at room temperature for 2 weeks, a roll-shaped laminated film was put on a bag making machine to produce a bag-like processed product, and bag forming suitability was confirmed. Furthermore, using a filling machine, the contents were filled using a bag-like processed product, and filling suitability was confirmed. Further, the laminated film was cut out from the winding for 2 weeks every few days immediately after aging, and the static friction coefficient was determined by the inclination method based on JIS P8147 for the sealant surface and the substrate film surface. Further, the amount of lubricant on the surface of the base film and the surface of the sealant layer was quantified by surface solvent extraction and a gas chromatograph / mass spectrometer.

(Comparative Example 1)
A base film having a multilayer structure of nylon film (thickness 20 μm) / barrier layer (aluminum foil (material)) was prepared. On the other hand, as a sealant layer, 1000 ppm of erucic acid amide was added as a lubricant with respect to the resin weight, and the same polypropylene as in the example of a film thickness of 100 μm produced by a casting method was used. And the laminated film was manufactured using the dry laminating apparatus as shown in FIG. A polyurethane-based adhesive was used as the adhesive, and a sealant layer made of polypropylene was formed on the barrier layer side of the base film. In addition, the laminated film was produced without performing the washing process.

  Immediately after completion of winding, the film was conveyed to an aging chamber and subjected to aging for curing the adhesive at 45 ° C. for 24 hours. Then, after storing at room temperature for 2 weeks, a roll-shaped laminated film was put on a bag making machine to produce a bag-like processed product, and bag forming suitability was confirmed. Furthermore, using a filling machine, the contents were filled using a bag-like processed product, and filling suitability was confirmed. Further, the laminated film was cut out from the winding for 2 weeks every few days immediately after aging, and the static friction coefficient was determined by the inclination method based on JIS P8147 for the sealant surface and the substrate film surface. Further, the amount of lubricant on the surface of the base film and the surface of the sealant layer was quantified by surface solvent extraction and a gas chromatograph / mass spectrometer.

  In Examples and Comparative Examples, changes in static friction coefficient and erucamide amount on the surface of the sealant layer and the substrate film measured every few days from aging to 2 weeks are shown in FIGS. 5 and 6. Table 1 shows the evaluation of suitability. For bag-making aptitude, the bag-like processed product with a round mark indicates that it has excellent bag-making aptitude without any deviation in seal width or printed pattern. A gap in the seal width and a deviation in the printed pattern were confirmed, indicating that bag-making suitability is poor.

In Example 1 and Comparative Example 1, the amount of lubricant added to the sealant was the same, but when the coefficient of static friction between the base film surfaces was compared, Comparative Example 1 was one day after the end of aging. Later, the coefficient of static friction is already low, and the amount of erucamide on the surface of the base film is increasing. Within two weeks after aging, the coefficient of static friction on the surface of the base film is greatly reduced. For this reason, in the laminated film of Comparative Example 1, the surface of the base film is easy to slip, and correspondingly, problems occur in the bag making process. On the other hand, in Example 1, even after 2 weeks from aging, the static friction coefficient on the base film side is not so lowered, and there is no problem in the bag making process. On the other hand, the static friction coefficient on the sealant side gradually decreases in the two weeks after aging, so that no trouble occurs in the filling process.

DESCRIPTION OF SYMBOLS 1 ... Laminated film 11 ... Base film 12 ... Adhesive layer 13 ... Sealant layer 14 ... Functional layer 21 ... Unwinding mechanism 22 ... Adhesive application mechanism 23 ... Drying furnace 24 ... Unwinding mechanism 25 ... Winding mechanism 26 ... Lamination Mechanism 27 ... Cleaning mechanism 28 ... Spray for application of cleaning solvent 29 ... Cleaning solvent delivery pump 30 ... Doctor blade 31 ... Dryer 32 ... Dish 33 ... Guide roll

Claims (5)

In a method for producing a laminated film comprising a sealant layer containing a lubricant on at least one surface of a base film,
A step of feeding a roll-shaped base film and continuously transporting the base film;
Forming a sealant layer on at least one surface of the continuously conveyed base film;
A step of winding a base film comprising a continuously conveyed sealant layer;
A method for producing a laminated film, comprising:   It comprises a step of applying a cleaning solvent to one side of a film containing a lubricant to be a sealant layer, a step of scraping off the lubricant present on the one side of the film together with the cleaning solvent, and a step of drying the remaining solvent. The method for producing a laminated film according to claim 1.   The method for producing a laminated film according to claim 1 or 2, wherein the lubricant contained in the sealant layer is a fatty acid amide lubricant.   The method for producing a laminated film according to any one of claims 1 to 3, wherein the sealant layer is made of a polyolefin-based resin.   It is a manufacturing apparatus used with the manufacturing method of the laminated | multilayer film of any one of Claims 1 thru | or 4, Comprising: The unwinding mechanism for sending out a roll-shaped base film continuously, and it is conveyed continuously A laminate mechanism for laminating a sealant layer on at least one surface of a web-like substrate, and a winding mechanism for winding the substrate film, and before laminating the substrate film and the sealant film, the sealant film An apparatus for producing a laminated film, comprising a mechanism for removing a lubricant present on one side of the film.

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