JPWO2012144536A1 - Film and packaging bag - Google Patents

Abstract

A film having good line suitability and peelability of contents is provided.
The film (1) according to the present invention is characterized by comprising a resin in which a release agent containing at least a surfactant that is solid at room temperature and a surfactant that is liquid at room temperature is added to the sealant layer (12).

Description

  The present invention relates to a film and a packaging bag suitable for filling and packaging a highly viscous content such as kneading paste, shortening, jam, mayonnaise, etc., and a film and packaging bag that can satisfactorily peel the content.

  Sticky contents such as kneaded rice cakes, shortenings, jams, mayonnaise, etc. are supplied to the market by filling and packaging them into packaging bags made of plastic film.

  However, the contents filled and packaged in the packaging bag adhere to the inner surface of the packaging bag due to the stickiness of the contents, the fluidity of the contents in the packaging bag is poor, and the inner surface of the packaging bag Since the contents in contact with the portion remain on the inner surface of the packaging bag and are difficult to remove from the packaging bag, the content removal operation is very troublesome. For this reason, it is desired to reduce the content extraction yield. In addition, the contents remaining in the packaging bag are discarded together with the packaging bag, and the amount of the discarded content is relatively large. Therefore, the disposal of the packaging bag is regarded as an environmental problem. ing.

  Therefore, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 2000-355362), in a packaging bag filled with contents, for the purpose of improving the peelability between the film forming the packaging bag and the contents, Applying a release agent to the film is performed.

  In addition, the packaging bag mentioned above can be formed using the vertical pillow filling packaging machine currently disclosed by FIG. 4 of patent document 1, for example. Specifically, a release agent-coated film wound up in a roll shape is formed into a cylindrical shape in a molding member such as a sailor in the process of continuously moving from the state of a strip from the upper side to the lower side. The overlapping portions in the vertical direction and the horizontal direction in which the sealant layers are combined are heat-sealed. The inside of the bag is filled with the contents, and after filling, the opening is transversely heat sealed. Thereby, a packaging bag can be formed.

  Patent Document 2 (Patent No. 2787269) discloses an additive having a freezing point of 10 ° C. or lower and a HLB (Hydrophile Lipophile Balance) of 5.0 or lower as a release agent relative to the base resin. It discloses about the technique which suppresses adhesion of a content with respect to a highly viscous content by adding -3 weight part.

  Further, Patent Document 3 (Japanese Patent Application Laid-Open No. 2007-284071) discloses a cap with high liquidity obtained by adding a fatty acid ester having 0 or 1 hydroxyl groups to the base resin.

JP 2000-355362 A Japanese Patent No. 2787269 JP 2007-284071 A

  However, in a film added with a liquid release agent as in Patent Document 2, the release agent bleeds out from the film after film formation, and the release agent adheres to and accumulates on the film bonding line and bag making line. . At that time, stickiness or slipperiness may be improved by the release agent deposited on the line, which may affect the running performance of the film bonding line.

  Moreover, when rolling the film which apply | coated the release agent, a release agent surface will contact the back side surface of a film. As a result, the release agent is transferred to the back side surface of the film, and when the film is run on a bag making machine, the release agent may adhere to a molded member such as a sailor, which may affect the running property of the film. .

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a film and a packaging bag having good line suitability and content peelability.

  In order to achieve this object, the present invention has the following features.

The film according to the present invention is
The sealant layer is made of a resin in which a release agent containing at least a surfactant that is solid at room temperature and a surfactant that is liquid at room temperature is added.

The packaging bag according to the present invention is
A bag is made using the film described above.

  ADVANTAGE OF THE INVENTION According to this invention, the film and packaging bag with favorable line aptitude and the peelability of the contents can be provided.

It is a figure which shows the structural example of the multilayer film 1 for food packaging bags of 1st Embodiment. It is a figure which shows the packaging bag 101 (envelope sticking) bag-made using the multilayer film 1 shown in FIG. It is a figure which shows the packaging bag 301 (gap sticking) which was bag-made using the multilayer film 1 shown in FIG. It is a figure which shows the example of a method of forming a packaging bag using the multilayer film 1 shown in FIG. It is a figure which shows the determination result of line suitability and peelability. It is a figure which shows the measurement result of a static friction coefficient. It is a figure which shows the structural example of the multilayer film 2 of 2nd Embodiment. It is a figure which shows the structural example of the multilayer film 3 of 3rd Embodiment. It is a figure which shows the structural example of the multilayer film 4 of 4th Embodiment. It is a figure which shows the structural example of the packaging bag 401 of 5th Embodiment, (a) shows the example of whole structure of the packaging bag 401, (b) is a figure which shows the AA cross-section structural example of (a). It is. It is a figure which shows the structural example of the multilayer film F which forms the packaging bag 401 shown in FIG. 10, and the method example (envelope sticking) which forms the packaging bag 401 using the multilayer film F. It is a figure which shows the structural example of the packaging bag 501 of 5th Embodiment, (a) shows the example of whole structure of the packaging bag 501, (b) is a figure which shows the AA cross-section structural example of (a). It is. It is a figure which shows the structural example of the multilayer film F which forms the packaging bag 501 shown in FIG. 12, and the example of a method (gap sticking) which forms the packaging bag 501 using the multilayer film F.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  As a result of intensive studies to achieve the above object, the present inventors can suppress bleed-out immediately after film formation by using two types of surfactants having different melting points as release agents. The present inventors have found that it is possible to form a film that improves suitability and also has good peelability of the contents.

  For example, as two types of surfactants having different melting points, a surfactant that is solid at normal temperature and a surfactant that is liquid at normal temperature are used, so that the solid and the liquid are mixed and the release agent has viscosity. Can be made. As a result, line suitability and peelability can be improved. However, the two types of surfactants having different melting points are not limited to the above-mentioned surfactants that are solid at normal temperature and surfactants that are liquid at normal temperature, and any two types of interfaces having different melting points. By using the activator as a release agent, a film with good line suitability and content peelability can be obtained.

(First embodiment)
First, the multilayer film 1 according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram illustrating a configuration example of a multilayer film 1 for food packaging bags according to the first embodiment. In addition, although demonstrated here as a multilayer film, the single layer film which consists only of a sealant layer may be sufficient.

  As shown in FIG. 1, the multilayer film 1 of this embodiment includes a base material layer 11 and a sealant layer 12. Further, a release agent is added to the sealant layer 12 of the multilayer film 1, and a release agent coating film 13 is formed by bleed-out over time, whereby the multilayer film 1 shown in FIG. 1 is formed.

  The base material layer 11 is configured using a known material such as a polyolefin resin such as polypropylene or polyethylene, a polyester such as polyethylene terephthalate, or polyamide. The thickness of the base material layer 11 is preferably thinner than the sealant layer 12, and a preferable thickness is 5 μm to 50 μm, and more preferably 10 μm to 25 μm. The base material layer 11 can also be constituted by a stretched film that can be shrunk by applying heat after filling the contents. In this case, biaxially stretched nylon is preferable from the viewpoints of shrinkability and moldability.

  The sealant layer 12 is composed of a mixed resin in which a surfactant as a release agent is mixed with a base resin made of a known material such as polyolefin, polyester, and polyamide. In addition, it is also possible to mix and use a plurality of resins as the base resin. The surfactant as the release agent is preferably added in the range of 100 ppm to 50000 ppm. This is because if the amount of the surfactant added is more than 50000 ppm, a large amount of the surfactant adheres to the film forming machine, bag making machine, etc., and the line suitability deteriorates. Moreover, when the addition amount of the surfactant is less than 100 ppm, the peelability of the contents becomes insufficient. The thickness of the sealant layer 12 is preferably 15 μm to 100 μm, and more preferably 30 μm to 70 μm. In addition, when the multilayer film 1 is formed by sand lamination, a sand layer (not shown) as a third layer can be interposed between the base material layer 11 and the sealant layer 12. is there. By providing the sand layer, the rigidity difference between the base material layer 11 and the sealant layer 12 can be buffered. As the resin constituting the sand layer, for example, a polyethylene-based resin such as low-density polyethylene or linear low-density polyethylene is applicable.

  As the release agent to be added to the sealant layer 12, a known surfactant can be used. Among them, it is composed of surfactants, especially fatty acid esters with low HLB values by the Griffin method, in order to have good peelability even for high oil content such as flour paste and kneading koji. It is preferable. The preferred HLB value is 1.5 or less, and more preferably 1.0 or less. This is because fatty acid esters with an HLB value higher than 1.5 have poor peelability on the contents, especially chocolate paste with high oil content, and fatty acid esters with HLB values of 1.5 or less have high oil content like chocolate paste. This is because good peelability can be obtained. Further, among fatty acid esters having an HLB value of 1.5 or less, a material having a small number of hydroxyl groups is preferable for improving the peelability of the contents, and the number of hydroxyl groups is more preferably 0. Examples of the fatty acid ester having a low HLB value and zero hydroxyl groups include glycerin fatty acid full esters such as triglyceride.

  In addition, it is preferable to use two or more types of surfactants having different melting points in order to control the bleed-out amount immediately after film formation and the bleed-out amount with time.

  The mixed surfactant preferably contains at least a surfactant that is liquid at normal temperature (23 ° C.) and a surfactant that is solid at normal temperature. This is because surfactants that are solid at room temperature are unlikely to bleed out, but liquid surfactants have little entanglement with resin molecules. As the agent bleeds out, the bleed out can be promoted by bleeding out the solid surfactant.

  In addition, by using a solid surfactant that is difficult to bleed out, the bleed-out can be appropriately advanced compared to a liquid surfactant alone, so that film formation is possible compared to using only a liquid surfactant alone. Immediately after the bleed out is suppressed, the adhesion of the release agent on the production line can be suppressed, and the problem of powder blowing due to the solid surfactant, stickiness of the line, and slip can be reduced, and the line running performance of the film can be reduced. Can be improved.

  The difference in melting point between the two types of surfactants is preferably 10 ° C. or more, and more preferably 40 ° C. or more for improving line suitability and peelability when filling the contents. Further, the melting point of the liquid surfactant is preferably 10 ° C. or lower, and more preferably 0 ° C. or lower. The melting point of the solid surfactant is preferably 30 ° C. or higher, and more preferably 50 ° C. or higher.

  The blend ratio of the surfactant that is liquid at normal temperature and the surfactant that is solid at normal temperature is preferably 4: 1 to 1: 4. This is because if the blend ratio of the surfactant that is solid at room temperature is too large, the amount of bleedout immediately after film formation will be insignificant, making the content unsuitable for peeling, and the viscosity of the surfactant too high, This is because the running property of the film deteriorates due to the surfactant attached to the line. In addition, if the ratio of surfactants that are liquid at room temperature is too high, the amount of bleed-out will increase so much that the surfactant will adhere to the line, making it easier to run the film laminating line and bag making line. This is to have an adverse effect.

  In view of the above points, the sealant layer 12 is preferably made of a resin to which a release agent containing at least a surfactant that is solid at room temperature and a surfactant that is liquid at room temperature is added for line adequacy and film appearance. . The blend ratio is preferably from 4: 1 to 1: 4 for surfactants that are liquid at normal temperature: surfactants that are solid at normal temperature, and the higher the amount of liquid surfactant mixed, the better the line. And more preferable. In addition, the surfactant is preferably a fatty acid ester having an HLB of 1.0 or less and a hydroxyl group number of 0 in order to provide a good releasability for a highly oily viscous product. As a result, the release agent is made viscous, the line suitability is good, the release property of the contents is good, and the back-off of the release agent to the base material layer 11 when the film is stored in a roll shape, etc. Fewer multilayer films 1 can be provided.

  The multilayer film 1 configured as described above can be formed by extruding a film constituting the base material layer 11 and a film constituting the sealant layer 12 with an extrusion laminator, and thermally fusing both films. Note that the adhesive surface between the base material layer 11 and the sealant layer 12 can be adhered using an adhesive in order to improve the adhesion at the interface. In this case, as the adhesive, isocyanate, polyethyleneimine, titanate, urethane, or the like can be used. After the multilayer film 1 is formed, the multilayer film 1 is wound and managed by the winding tube with the sealant layer 12 side of the multilayer film 1 facing inside.

  In addition, by making a packaging bag using the multilayer film 1 shown in FIG. 1 mentioned above, the packaging bag of the packaging form shown in FIG. 2 and FIG. 3 can be made, for example. FIG. 2 shows a configuration example of the packaging bag 101 formed by envelope pasting, and FIG. 3 is a diagram showing a configuration example of the packaging bag 301 formed by jointing.

  The envelope-wrapped packaging bag 101 shown in FIG. 2 is formed by bending the multilayer film 1 shown in FIG. Seal portions 102a and 102b are formed to form a cylindrical packaging bag. The cylindrical packaging bag is filled with a predetermined amount of contents, and the upper horizontal seal portion 103 and the lower horizontal seal portion 104 are formed so as to intersect with the vertical seal portions 102a and 102b, respectively. To seal. Reference numeral 105 denotes a non-sealed portion where the multilayer films 1 are not sealed.

  Further, the palm-wrapped packaging bag 301 shown in FIG. 3 is a vertical seal in which the multilayer film 1 shown in FIG. 1 is curved into a cylindrical shape and both side edges thereof are overlapped, and the overlapped portions are sealed with each other. A portion 302 is formed to form a cylindrical packaging bag. The cylindrical packaging bag is filled with a predetermined amount of contents, and the upper horizontal seal portion 303 and the lower horizontal seal portion 304 are formed so as to intersect with the vertical seal portion 302, and the contents are sealed. To do. Reference numeral 305 denotes a non-seal portion where the multilayer films 1 are not sealed, and reference numeral 306 denotes a seal portion where the multilayer films 1 are sealed.

  By making a packaging bag using the multilayer film 1 shown in FIG. 1 described above, it is possible to form a packaging bag with good line suitability and peelability of contents. In addition, the packaging form of the packaging bag made using the multilayer film 1 shown in FIG. 1 is not particularly limited, and it is possible to form a packaging bag of any packaging form such as the above-described envelope pasting and palm-joining pasting. is there.

  Next, an example of a method for making a packaging bag using the multilayer film 1 shown in FIG. 1 will be described with reference to FIG. In the following description, an example in which the packaging bag 101 shown in FIG. 2 is made using the multilayer film 1 shown in FIG. 1 will be described.

  The packaging bag 101 shown in FIG. 2 includes a first step for forming a multilayer film into a cylindrical shape, a second step for performing vertical sealing, a third step for performing horizontal sealing at the bottom of the bag, a fourth step for filling contents, and an upper portion of the bag. The fifth step of performing the horizontal sealing and the fifth step of cutting the boundary line of the continuous bag are sequentially performed in the above order, and the packaging device is intermittently operated. Hereinafter, it demonstrates in order of a process.

1st process which makes a multilayer film cylindrical:
The multilayer film 1 fed from the original fabric roller R is guided to the former 212 through a plurality of feeding rolls 220 and 221. Reference numeral 219 denotes a registration mark sensor that detects registration marks printed at regular intervals in the longitudinal direction of the multilayer film 1, and has a function of causing the multilayer film 1 to have a constant feeding length on the track of the packaging machine.

  In the present embodiment, it is necessary to subject the multilayer film 1 to a thermobacterial treatment in the previous step guided to the former 212. A solvent for the thermobacteria treatment is introduced into the bathtub 240 shown in FIG. The multilayer film 1 is immersed and the multilayer film 1 is subjected to thermobacteria treatment. Examples of the solvent for thermobacteria treatment include hydrogen peroxide.

  Since the sealant layer 12 constituting the multilayer film 1 of the present embodiment is composed of a mixed resin mixed with a surfactant as a release agent, the multilayer film 1 is immersed in a solvent for thermobacterial treatment to perform a thermobacteria treatment. Even if it gives, release agent does not peel off conventionally. For this reason, even if the multi-layer film 1 is subjected to a thermobacteria treatment, it is possible to ensure releasability from the contents.

  For example, in Patent Document 1, a release agent is applied to a film by a coating method using a roll coating machine. For this reason, when it was going to form a packaging bag using the vertical pillow filling packaging machine 200 shown in FIG. 4, when the film was immersed in the solvent (hydrogen peroxide solution) for a thermobacteria treatment, it applied to the film. The release agent will be peeled off from the film. As a result, the function of the release agent cannot be exhibited, the peelability of the contents of the finally formed packaging bag is reduced, and the contents cannot be easily peeled off from the film when opened. End up.

  On the other hand, in this embodiment, since the release agent is mixed in the sealant layer 12, in order to perform the thermobacteria treatment on the multilayer film 1, even when the multilayer film 1 is immersed in a solvent for the thermobacteria treatment, Since the release agent is not peeled off, it is possible to secure the peelability of the packaging bag 101 that is finally formed, and to form the packaging bag 101 with good peelability of the content.

  The multilayer film 1 subjected to the thermobacteria treatment is curved in a cylindrical shape while passing through the former 212, and both side edges of the curved tip overlap to form an overlapped portion.

Second step for longitudinal sealing:
The overlapping portion formed in the first step described above is heat-sealed by the vertical sealing machine 213 to form the vertical sealing portions 102a and 102b.

Third step for lateral sealing at the bottom of the bag:
The openable / closable ironing roll 215 is closed, and the upper open part side of the cylindrical body 107 formed from the multilayer film 1 is ironed. The traversing path of the packaging machine is closed by closing the lateral sealing machine composed of the first lateral sealing machine 216 and the second lateral sealing machine 217 which can be opened and closed at the ironing part 108 which is a part of the flattened cylindrical body 107. Upper and lower lower seal portions 104 at the bottom of the bag are formed.

Fourth step of filling the contents:
After the above, a predetermined amount of contents W are charged from the hopper 211 and filled into the cylindrical body 107.

Fifth step for lateral sealing of the upper part of the bag:
After opening the squeeze roll 215, the first horizontal sealing machine 216 and the second horizontal sealing machine 217, the feed roll 214 is rotated so that the cylindrical body 107 and the subsequent multilayer film 1 together with the filling and packaging bag 101a before separation. Is fed out for a predetermined length.

  The first horizontal sealing machine 216 and the second horizontal sealing machine 217 are closed, the ironing part 108 is thermally welded, and the region which becomes the upper horizontal sealing part 103 is welded by the second horizontal sealing machine 217, and on the track continuous therewith. A region to be the next lower horizontal seal portion 104 located upstream is welded. Then, the filling and packaging bag 101a before separation is formed.

Fifth step of cutting the boundary line of the continuous bag:
The press / cutter 218 is closed to strongly press the region to be the lower horizontal seal portion 104 and the region to be the upper horizontal seal portion 103, which are welded portions to which the pre-separation filling and packaging bag 101a is connected, and The packaging bag 101 is dropped and dropped onto the conveyor 230.

  The packaging bag 101 of the present embodiment can obtain the packaging bag 101 filled with the contents W through the first to fifth steps described above.

  In the sealant layer 12 of the multilayer film 1 of the present embodiment, a release agent containing at least a surfactant that is solid at room temperature and a surfactant that is liquid at room temperature is added, and therefore the multilayer film 1 is used for packaging. By making the bag 101, it is possible to obtain the packaging bag 101 having good line suitability and peelability of the contents. In addition, in the packaging bag 301 shown in FIG. 3, the packaging bag 301 having good line suitability and good peelability of the contents can be obtained in the same manner as the packaging bag 101 shown in FIG.

(Example)
Next, examples of adding a release agent according to this embodiment will be described. In addition, the Example shown below is an example and this embodiment is not limited to the following Example.

<Peeling agent addition test>
In this example, a film having a thickness of 60 μm and a width of 320 mm was formed using linear low-density polyethylene (MFR = 2, density: 0.916) to which a release agent composed of a material described later was added. Thereafter, polyamide (Mitsubishi Resin Co., Ltd., Santonyl ST, thickness: 15 μm) as a base resin and a film of linear low density polyethylene film were laminated together using a urethane-based adhesive. The laminated multilayer film was formed into 1000 m, wound up in a roll shape, allowed to stand at 40 ° C. for 48 hours, and then filled with a flower paste as a content together with a bag using an ONPACK2030 manufactured by ORIHIRO.

Example 1
500 ppm of triglyceride (melting point: 65 ° C, HLB value: 0) that is solid at room temperature and 500 ppm of triglyceride (melting point: -12 ° C, HLB value: 0) that is liquid at room temperature to the above linear low density polyethylene. A release agent mixed to a total of 1000 ppm was added to form a film.

(Example 2)
A total of 1000 ppm of triglyceride (melting point: 65 ° C, HLB value: 0), which is solid at room temperature, and 200 ppm of triglyceride (melting point: -12 ° C, HLB value: 0), which is liquid at room temperature, was used as the release agent. Except for the above, a film similar to Example 1 was formed.

(Example 3)
A total of 1000 ppm of triglyceride (melting point: 65 ° C, HLB value: 0), which is solid at room temperature, and 800 ppm of triglyceride (melting point: -12 ° C, HLB value: 0), which is liquid at room temperature, was used as the release agent. Except for the above, a film similar to Example 1 was formed.

(Example 4)
Non-full esterified glycerin fatty acid ester (melting point: 65 ° C, HLB value: 4.3) that is solid at room temperature as a release agent and 500 ppm glycerin fatty acid ester that is liquid at normal temperature (melting point: 24 ° C, A film similar to that of Example 1 was formed except that a total of 1000 ppm of HLB value: 3.1) of 500 ppm was used.

(Example 5)
A film similar to Example 1 except that 500 ppm of triglyceride (melting point: -12 ° C, HLB value: 0) and 500 ppm of oleic acid amide (melting point: 70 ° C), which are liquid at room temperature, were used as the release agent. Was formed.

(Comparative Example 1)
A film was formed in the same manner as in Example 1 except that 1000 ppm of triglyceride (melting point: 65 ° C., HLB value: 0), which was solid at room temperature, was used as a release agent.

(Comparative Example 2)
A film was formed in the same manner as in Example 1 except that 1000 ppm of triglyceride (melting point: −12 ° C., HLB value: 0), which is liquid at room temperature, was used as a release agent.

(Comparative Example 3)
Glueline fatty acid ester (melting point: 65 ° C, HLB value: 4.3), which is liquid at room temperature, using a roll coater after laminating a linear low-density polyethylene with no release agent and a base resin. It was applied to the surface of linear low density polyethylene. The coating amount was 5% (4.75 μm) with respect to the layer thickness (95 μm) of the multilayer film.

(Determination of film appearance)
After film formation, powders were blown, or those in which no release agent was seen on the surface of the base resin of the film wound up in a roll shape were evaluated as ◯, and those in which each appeared remarkably were evaluated as ×.

(Line suitability: Judgment of running performance)
When the produced film is made, there is no clogging of the film when it is operated for 12 hours. As evaluated.

(Determination of peelability)
Fill the contents, cut with a knife so that it crosses the center and sides of the bag, and turn it back into a film shape to drop chocolate paste and custard paste. The amount of adhesion was visually confirmed. Evaluations were made as ○ where no adhesion of the contents was observed at corners such as the film-welded surface, and x when adhesion was observed.

  Each determination result is shown in FIG. As shown in FIG. 5, those using a mixture of a fatty acid ester that is solid at room temperature and a fatty acid ester that is liquid at room temperature as the release agent, all have good line suitability and do not hinder the runnability of the film. It was. Moreover, the thing using all the glycerin fatty acid full ester of Examples 1-3 has acquired favorable peelability also with respect to the chocolate paste with much oil content rather than a custard paste. On the other hand, when all were not glycerol fatty acid ester, the peelability with respect to the chocolate paste with high oil content was bad.

  Moreover, the comparative example 1 resulted in a bad appearance with powder blowing with the passage of time after film formation. In Comparative Example 2, the release agent was sticky due to a large amount adhering to the bag making machine, resulting in poor line suitability. Moreover, in Comparative Example 3, there was much setback to the film, and further, the appropriateness of the line due to adhering to the line was observed. Moreover, the result with bad peelability with respect to chocolate paste with much oil was brought.

  For this reason, from the above test results, as a release agent, a blend resin of a surfactant that is solid at normal temperature and a surfactant that is liquid at normal temperature is added to the base resin and used by bleeding out. It was found that a film having good appearance, line suitability, and peelability can be obtained. Further, it has been found that by using glycerin fatty acid full ester in the surfactant, good peelability can be obtained even for highly viscous contents such as chocolate paste.

<Film slip test>
Next, the running property when the film was slid repeatedly in the case where the release agent was applied to the sealant layer 12 and the case where the release agent was added to the sealant layer 12 was tested.

(Example)
A multilayer film composed of polyamide (15 μm) / polyethylene (20 μm) / linear low density polyethylene (60 μm) was molded using a sand laminate method. The polyamide and polyethylene were bonded using an adhesive. In the linear low density polyethylene in this example, triglyceride that is solid at room temperature (melting point: 65 ° C., HLB value: 0) is 500 ppm, and triglyceride that is liquid at room temperature (melting point: −12 ° C., HLB value: 0) A total of 1000ppm of 500ppm has been added.

(Comparative example)
In the comparative example, a multilayer film was formed as in the example. In this comparative example, no release agent was added to the linear low-density polyethylene, and the surface of the linear low-density polyethylene using a roll coater with a liquid glycerin fatty acid ester at room temperature after forming the multilayer film. It was applied to. The coating amount was 5% (4.75 μm) with respect to the layer thickness (95 μm) of the multilayer film.

(Measuring method)
The static friction coefficients of the multilayer films of Examples and Comparative Examples were measured by a tilt method using a friction tester of “Static Friction TESTER: HEIDON-10” manufactured by HEIDON. Specifically, a multilayer film as a sample is fixed to a flat indenter with a ground contact area of 35 x 75 mm and 150 g, the ascending plate is raised at an average rising speed of 10 ° / 6sec, and the indenter slips at an angle (tanθ). The corresponding static friction coefficient was read, and the static friction coefficient of the multilayer film was measured.

  FIG. 6 shows the results of measurement of the coefficient of static friction performed in the test environment of the multilayer film of Examples and Comparative Examples at 23 ° C. and 50% RH. FIG. 6 shows the static friction coefficient of each sample when five samples were prepared for each of the examples and comparative examples, and the test was continuously performed without wiping the stainless steel surface (rising plate) of the testing machine. In addition, the static friction coefficient measured the static friction coefficient 3 times about the same sample, and made it the average value of the static friction coefficient of 3 times.

  From the measurement results of the coefficient of static friction shown in FIG. 6, a multilayer film in which a release agent containing triglyceride that is solid at normal temperature and triglyceride that is liquid at normal temperature in an example is kneaded into linear low-density polyethylene, It was found that even when the sample was changed and slid repeatedly, the slidability did not change and the slidability was stable. On the other hand, the multilayer film in which the release agent is applied to the surface of the linear low density polyethylene in the comparative example, the release agent adheres and accumulates on the stainless steel surface every time it is slid repeatedly, affecting the slipperiness of the multilayer film, and the coefficient of static friction As a result, the slipperiness was adversely affected.

(Second Embodiment)
Next, a second embodiment will be described.

  As shown in FIG. 7, the multilayer film 2 of the second embodiment includes a base material layer 21 in contact with the bag making machine on which the base material roughening surface 24 is formed, and a sealant layer 22. FIG. 7 is a diagram showing a configuration example of the multilayer film 2 for food packaging bags of the present embodiment. The base material layer 21 and the sealant layer 22 constituting the multilayer film 2 of the second embodiment are constituted using the same materials as the base material layer 11 and the sealant layer 12 constituting the multilayer film 1 of the first embodiment. Can do. In addition, about the bag making method, it is possible to use suitably the above-mentioned well-known techniques.

  In the multilayer film 2 of the present embodiment, a release agent is added to the sealant layer 22, and the release agent coating film 23 is formed by bleeding out over time, but the base material layer 21 is in contact with the bag making machine. A roughened substrate 24 is formed on the surface on the side. For this reason, when the multilayer film 2 shown in FIG. 7 is molded and then the multilayer film 2 is rolled, the contact area with the release agent coating 23 is reduced, and the transfer of the release agent to the base material layer 21 is reduced. Can be made. Thereby, transfer to the bag making machine of the release agent at the time of bag making can be suppressed, and it can reduce that film runnability deteriorates.

  The roughened surface 24 of the substrate preferably has a maximum height Rmax that is at least larger than the thickness of the release agent coating 23, and is preferably changed as appropriate depending on the amount of bleed out when the release agent is added to the sealant layer 22. . As for the surface roughness of the roughened substrate 24, the arithmetic average roughness Ra is preferably 0.1 μm or more, and the maximum height Rmax is preferably 2.0 μm or more. However, the arithmetic average roughness is a value measured according to JIS B 0601-2001. The method for forming the roughened surface 24 of the base material layer 21 is not particularly limited, and any method can be used.

  For example, in the production of a polymer film, generally, a film melt-extruded from a T die is brought into contact with a cooling roll and cooled. In this case, if the surface of one cooling roll is roughened, the roughened surface is transferred to the multilayer film 2, and the multilayer film 2 with one surface roughened can be obtained. In the case of a biaxially stretched film, the film cooled by the cooling rolls is further stretched in two directions in the vertical and horizontal directions. Smaller than.

  In addition, as the release agent added to the sealant layer 22, a known surfactant can be used. However, in order to provide a high viscosity and good release properties with respect to oily contents, the HLB is low. A surfactant is preferred. A preferable HLB value is 1.5 or less, and more preferably 1.0 or less. Further, fatty acid esters having 0 or 1 hydroxyl groups are preferable, and triglyceride is particularly preferable. In addition, by mixing a surfactant that is solid at room temperature and a surfactant that is liquid at room temperature, stickiness caused by excessive powder blowing or bleeding out when bleeding out can be suppressed.

(Third embodiment)
Next, a third embodiment will be described.

  The multilayer film of the present embodiment has suitability for easy opening (easy peel), and can be opened without using a tool such as a knife when opening the packaging bag, without attaching the contents to the film, It can be easily taken out. The packaging bag in this embodiment is manufactured by the vertical pillow filling and packaging machine 200 shown in FIG. 4 using the multilayer film 3 shown in FIG. As shown in FIG. 8, the multilayer film 3 of this embodiment includes a base material layer 31 and a sealant layer 32. In addition, about the bag making method, it is possible to use suitably the above-mentioned well-known techniques.

  The base material layer 31 is configured using a known material such as a polyolefin resin such as polypropylene or polyethylene, a polyester such as polyethylene terephthalate, or polyamide. The base material layer 31 is preferably configured with a thickness of 9 to 50 μm, and more preferably configured with a thickness of 12 to 25 μm.

  The sealant layer 32 is composed of a mixed resin in which a surfactant as a release agent is mixed with a resin having heat sealability and easy peelability.

  Examples of the resin having heat sealability and easy peel suitability include, for example, a low density polyethylene, a medium density polyethylene, a high density polyethylene, a linear low density polyethylene, an ethylene-α olefin copolymer polymerized using a metallocene catalyst, Polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene Acid-modified polyolefin obtained by acid-modifying polyolefin resin such as copolymer, methylpentene polymer, polybutene polymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, polyethylene or polypropylene using unsaturated carboxylic acid Resins, polyvinyl acetate resins, poly (meth) acrylic resins, polyvinyl chloride resins, can be appropriately used other known resins, it is preferably made of two or more of these resins. For example, mixed resin of ethylene resin such as low density polyethylene and ethylene-α olefin copolymer, and propylene resin such as polypropylene, ethylene-propylene copolymer, ethylene-propylene-butene terpolymer A good easy peel can be formed by using.

  When the sealing bag 32 shown in FIGS. 2 and 3 is formed by sealing the sealant layer 32 made of two or more resins, for example, when the packaging bag 101 shown in FIG. The vertical seals 102a and 102b are peeled off simply by picking the tip of 105 with a finger and pulling the multilayer film 3, and the vertical seals 102a and 102b, the upper horizontal seal 103 and the lower horizontal seal 104 are easily peeled off. A cohesive peel easy-open seal can be constructed. Further, when opening the packaging bag 301 shown in FIG. 3, the seal part 306 is peeled off simply by picking the non-seal part 305 constituting the vertical seal part 302 with a finger and pulling the multilayer film 3, and the vertical seal part 302, An agglomerated easily peelable seal in which the upper horizontal seal portion 303 and the lower horizontal seal portion 304 are easily peeled can be configured.

  The cohesive peel easy-open seal is one in which the sealant layer 32 itself is broken and peeled off, and stringing does not occur at the time of peeling. For this reason, the resin which comprises a packaging bag does not mix in the contents. In addition, the seal strength is stable with a smooth peeling feeling, and the temperature dependency is very small. Furthermore, a pure white peeling mark is generated on the peeling surface. This white peeling mark can be used to check the sealing status in the packaging process since it can be visually confirmed whether or not the seal is suitable. As a result, the reliability of the contents filled in the packaging bag can be maintained. In addition, examples of the contents stored in the packaging bag include viscous materials such as kneaders, shortenings, jams, and mayonnaise. The contents to be accommodated in the packaging bag of the present embodiment are not particularly limited, and any contents can be accommodated. However, the packaging bag of the present embodiment is viscous because it has good peelability of the contents. A thing etc. are suitable.

  The surfactant as a release agent is added in the range of 100 ppm (parts per million) to 50000 ppm. This is because if the amount of the surfactant added is more than 50000 ppm, the amount of the surfactant bleed out increases, resulting in poor heat sealability. Further, this is because the transfer of the surfactant to the base material layer 31 that contacts when the multilayer film 3 is rolled increases. In the multilayer film 3 of the present embodiment, when the multilayer film 3 is rolled into a raw film, the sealant layer 32 and the base material layer 31 are in contact with each other, so that the surfactant is transferred to the base material layer 31. It will be. Moreover, when the addition amount of the surfactant is less than 100 ppm, the amount of the bleed-out of the surfactant is reduced, and the content is not sufficiently peelable. The sealant layer 32 is preferably configured with a thickness of 15 to 120 μm, and more preferably configured with a thickness of 40 to 80 μm.

  In the multilayer film 3 of the present embodiment, since a surfactant as a release agent is added to the sealant layer 32, after the multilayer film 3 described above is formed, the multilayer film 3 is peeled off by bleed-out on the sealant layer 32 side. An agent coating 33 is formed.

  As the surfactant to be added to the sealant layer 32, a known surfactant can be used, but it has a high releasability even for contents such as highly viscous flower pastes and kneads. Therefore, it is preferable to use a fatty acid ester having a low HLB value. The HLB value is preferably 1.5 or less, and more preferably 1.0 or less. Further, it is preferably a fatty acid ester having 0 hydroxyl groups. Among these materials, it is preferable to use triglyceride. In addition, by using a fatty acid ester having a high melting point and a low HLB value as a release agent, it is possible to suppress bleed-out of the release agent when the multilayer film 3 is stored as a raw fabric film. It is possible to effectively prevent the contents from adhering to the multilayer film 3 without inhibiting the set-off and without impairing the runnability of the multilayer film 3 during bag making.

  In addition, it is preferable to use two or more surfactants having different melting points in order to control the bleed-out amount immediately after film formation and the bleed-out amount over time. The mixed surfactant preferably contains at least a surfactant that is liquid at normal temperature (23 ° C.) and a surfactant that is solid at normal temperature. This is because surfactants that are solid at room temperature are unlikely to bleed out, but liquid surfactants have little entanglement with resin molecules. As the agent bleeds out, the bleed out can be promoted by bleeding out the solid surfactant. In addition, by using a solid surfactant that is difficult to bleed out, the bleed-out can proceed slowly compared to a liquid surfactant alone, so that film formation is possible compared to using only a liquid surfactant alone. Immediately after the bleed out is suppressed, adhesion of the release agent on the production line can be suppressed, and the problem of powder blowing due to the solid surfactant and the stickiness of the line can be reduced, and the line running property of the film is improved. Can do. The difference in melting point between the two types of surfactants is preferably 10 ° C. or more, and more preferably 40 ° C. or more for improving line suitability and peelability when filling the contents. Further, the melting point of the liquid surfactant is preferably 10 ° C. or lower, and more preferably 0 ° C. or lower. The melting point of the solid surfactant is preferably 30 ° C. or higher, and more preferably 50 ° C. or higher.

  The blend ratio of the surfactant that is liquid at normal temperature and the surfactant that is solid at normal temperature is preferably 4: 1 to 1: 4. This is because if the blend ratio of the surfactant that is solid at room temperature is too large, the amount of bleedout immediately after film formation will be insignificant, making the content unsuitable for peeling, and the viscosity of the surfactant too high, This is because the running property of the film deteriorates due to the surfactant attached to the line. In addition, if the ratio of surfactants that are liquid at room temperature is too high, the amount of bleed-out will increase so much that the surfactant will adhere to the line, making it easier to run the film laminating line and bag making line. This is to have an adverse effect. In addition, when a liquid surfactant is used alone as a resin having an easy peel suitability, the sealing property is lowered due to the influence of the surfactant, and it becomes difficult to form a good easy peel.

  In view of the above points, the sealant layer 32 is preferably made of a resin to which a release agent containing a surfactant that is solid at room temperature and a surfactant that is liquid at room temperature is added for line adequacy and film appearance. The blend ratio is preferably from 4: 1 to 1: 4 for surfactants that are liquid at normal temperature: surfactants that are solid at normal temperature, and the higher the amount of liquid surfactant mixed, the better the line. And more preferable. In addition, the surfactant is preferably a fatty acid ester having an HLB of 1.0 or less and a hydroxyl group number of 0 in order to provide a good releasability for a highly oily viscous product. As a result, the release agent is made viscous, the line suitability is good, the release property of the contents is good, and the back-off of the release agent to the base material layer 31 when the film is stored in a roll shape, etc. Fewer multilayer films 3 can be provided.

  The multilayer film 3 configured as described above can be formed by extruding a film constituting the base material layer 31 and a film constituting the sealant layer 32 with an extrusion laminator and heat-sealing both films. The adhesive surface between the base material layer 31 and the sealant layer 32 is preferably configured with an adhesive layer (not shown) interposed in order to improve the interface adhesion. The material constituting the adhesive layer can be composed of any material as long as the base material layer 31 and the sealant layer 32 can be adhered. As the adhesive constituting the adhesive layer, isocyanate, polyethyleneimine, titanate, urethane and the like can be used. After the multilayer film 3 is formed, the multilayer film 3 is wound around a winding tube with the sealant layer 32 side of the multilayer film 3 inward and stored.

  The above-described packaging bag formed by making the multilayer film 3 shown in FIG. 8 includes a release agent containing at least a surfactant that is solid at normal temperature and a surfactant that is liquid at normal temperature in a sealant layer 32 that is in contact with the contents. By including, it can improve the peelability with respect to the contents, especially a viscous thing, compared with the conventional packaging bag.

  In addition, since the sealant layer 32 in contact with the contents is an easy-peeling mixed resin composed of two or more resins, it can be easily opened and the contents can be prevented from sticking to the multilayer film 3, and the yield can be reduced. Can be improved.

(Fourth embodiment)
Next, a fourth embodiment will be described.

  The multilayer film of this embodiment can suppress vibration of the contents by thermally shrinking the contents after filling and packaging. Such a packaging bag can be formed by heat shrinking a packaging bag manufactured by the vertical pillow filling and packaging machine 200 shown in FIG. 4 using the multilayer film 4 shown in FIG. As shown in FIG. 9, the multilayer film 4 of this embodiment includes a base material layer 41 and a sealant layer 42.

  The base material layer 41 is made of a known resin stretched so that it can be shrunk by applying heat after filling the contents. However, the base material layer 41 preferably uses polyamide in order to satisfy various mechanical properties such as strength. Polyamide includes aliphatic nylon such as nylon 6, nylon 66, nylon 12 and nylon 46, aliphatic nylon containing aromatics such as MX_nylon, aromatic nylon, etc. or copolymer nylon of these, and these A mixture of resins is mentioned. It is more preferable to use biaxially stretched nylon from the viewpoints of shrinkability and moldability. The base material layer 41 is preferably configured with a thickness of 9 to 50 μm, and more preferably configured with a thickness of 12 to 25 μm.

  The sealant layer 42 is composed of a mixed resin in which a surfactant as a release agent is mixed with a resin having heat sealing properties.

  The resin having heat sealability is made of a known resin capable of forming the vertical seal portion and the horizontal seal portion of the packaging bag as a strong seal. As the heat seal strength of the vertical seal portion and the horizontal seal portion, it is preferable that the heat seal strength according to JIS K6854 is 10 N / 15 mm width or more. Thereby, for example, when the contents are filled using the vertical pillow filling and packaging machine 200 shown in FIG. 4, it is possible to prevent the contents from being exposed due to peeling of the vertical seal part and the horizontal seal part.

  The surfactant as a release agent is added in the range of 100 ppm (parts per million) to 50000 ppm. This is because if the amount of the surfactant added is more than 50000 ppm, the amount of the surfactant bleed out increases, resulting in poor heat sealability. Further, a large amount of the release agent is transferred from the film to the bag making machine, and the film running property is deteriorated. Moreover, when the addition amount of the surfactant is less than 100 ppm, the amount of the bleed-out of the surfactant is reduced, and the content is not sufficiently peelable. The sealant layer 42 is preferably configured with a thickness of 15 to 120 μm, and more preferably configured with a thickness of 40 to 80 μm.

  In the multilayer film 4 of the present embodiment, since a surfactant as a release agent is added to the sealant layer 42, after the multilayer film 4 described above is formed, the multilayer film 4 is peeled off by bleed-out on the sealant layer 42 side. An agent coating 43 is formed.

  The surfactant, which is a release agent added to the sealant layer 42, is preferably a material having a high oil content and a high peelability for highly viscous contents, and is composed of a material having a low HLB value. The HLB value is preferably 1.5 or less, and more preferably 1.0 or less. A surfactant having 0 hydroxyl groups is preferred. In addition, surfactants with a high melting point are preferred when heating to heat-fill or shrink packaging bags, and are surfactants that are solid at room temperature (23 ° C) and have 10 or more carbon atoms. It is preferable that By using a surfactant with a high melting point and a low HLB value as a release agent, bleeding out of the release agent when the multilayer film 4 is stored as a raw film is suppressed, and high temperature filling and packaging bag shrinkage are performed. Bleeding out of the release agent can be promoted by the heat of the time, so that the inside of the release agent during rolls can be prevented from turning over, and the contents of the multi-layer film 4 can be effectively conveyed without obstructing the runnability of the multilayer film 4 during bag making. And the multilayer film 4 can be prevented from adhering.

  In order to control the bleed-out amount immediately after film formation and the bleed-out amount with time, it is preferable to use two or more kinds of surfactants having different melting points. As the two types of surfactants, it is preferable to use a surfactant that is liquid at normal temperature and a surfactant that is solid at normal temperature. This is because surfactants that are solid at room temperature are unlikely to bleed out, but liquid surfactants have little entanglement with resin molecules. As the agent bleeds out, the bleed out can be promoted by bleeding out the solid surfactant. In addition, by using a solid surfactant that is difficult to bleed out, the bleed-out can proceed slowly compared to a liquid surfactant alone, so that film formation is possible compared to using only a liquid surfactant alone. Immediately after bleeding out is suppressed, adhesion of the release agent on the production line can be suppressed.

  The blend ratio of the surfactant that is solid at room temperature and the surfactant that is liquid at room temperature is preferably greater than the surfactant that is solid at room temperature than the surfactant that is liquid at room temperature. Thereby, while suppressing the bleed-out immediately after film formation, the surfactant can be well bleed-out at the time of heat shrinkage after bag making, and the problem of film blowing can be prevented. The difference between the melting points of the two types of surfactants is preferably 10 ° C. or higher, and more preferably 40 ° C. or higher, in order to improve the peelability when filling the contents. Further, the melting point of the liquid surfactant is preferably 10 ° C. or lower, and more preferably 0 ° C. or lower. The melting point of the solid surfactant is preferably 30 ° C. or higher, and more preferably 50 ° C. or higher.

  In the case of forming a shrink wrapping bag, the multilayer bag 4 shown in FIG. 9 is used to immerse the wrapping bag filled with the contents manufactured by the vertical pillow filling and packaging machine 200 shown in FIG. 4 in hot water or hot water, etc. Then, the multilayer film 4 constituting the packaging bag is thermally contracted to form a shrink packaging bag. Thereby, the contents filled in the packaging bag can be prevented from moving. In addition, when immersing a packaging bag in warm water, it is preferable to immerse in the range of 80-95 degreeC for 20 minutes or more, Preferably it is 30 minutes or more. In addition, this heat can promote bleeding out of the release agent added to the sealant layer 42 constituting the packaging bag, and can improve the peelability from the contents. Therefore, by promoting the bleed-out of the release agent after bag making, the transfer of the release agent to the base material layer 41 that occurs when the multilayer film 4 is rolled up and stored as a raw film is suppressed. be able to.

  Note that the above heat shrinking process is not limited to the above values depending on the contents volume and temperature, as long as it satisfies the original shrinkage and does not require seal strength and excessive tear stress. Can be changed. Furthermore, the heat shrinking step is not limited to hot water or hot water, and can be performed using a heater or the like. The configuration example of the multilayer film 4 forming the shrink packaging bag is not limited to the layer configuration example shown in FIG. 9, and the above-described shrink packaging bag is formed by configuring the multilayer film 4 using a heat-shrinkable resin. Can be formed.

  As described above, the packaging bag of this embodiment includes at least the release agent containing a surfactant that is solid at normal temperature and a surfactant that is liquid at normal temperature in the sealant layer 42 that is in contact with the contents. Compared to conventional packaging bags, the releasability of the contents, particularly viscous substances, can be greatly improved. In addition, surfactants that are solid at normal temperature are more than surfactants that are liquid at normal temperature, so that the surfactant can be well-bleeded out during thermal shrinkage after bag-making while suppressing bleed-out immediately after film formation. It is possible to prevent the problem of powder blowing of the film.

  In addition, by configuring the base material layer 41 using a resin that shrinks when heated after filling the contents, the packaging bag after filling the contents is thermally contracted to suppress vibration of the contents. A so-called shrink wrapping bag can be formed. Thereby, the contents filled in the packaging bag can be prevented from moving inside.

(Fifth embodiment)
Next, a fifth embodiment will be described.

  In recent years, a packaging bag excellent in pinhole resistance, impact resistance, and the like that can be transported in a large amount even with a material having a high specific gravity has been desired in order to reduce transportation costs. Therefore, a double packaging bag is used that fills a multilayer film as described in Patent Document 3 and Patent Document 4 and makes a bag, and behaves as two films. It should be noted that double packaging bags as disclosed in Patent Document 3 and Patent Document 4 are still poor in peelability of the contents, and a double packaging bag is desired in which the contents can be easily taken out when opened.

  First, a configuration example of the packaging bag 401 of the present embodiment will be described with reference to FIGS. 10 and 11. FIG. 10 is a diagram showing a configuration example of the packaging bag 401 of the present embodiment, FIG. 10 (a) shows an example of the overall configuration of the packaging bag 401, and FIG. 10 (b) is a diagram of FIG. 10 (a). It is a figure which shows the AA cross-section structural example. FIG. 11 is a diagram showing a configuration example of the multilayer film F that forms the packaging bag 401 of the present embodiment and a method example (envelope sticking) of forming the packaging bag 401 using the multilayer film F. FIGS. 11A and 11B show configuration examples of the multilayer film F, and FIG. 11C shows the multilayer film F shown in FIG. FIG. 11 (d) shows a state where the overlapping portions 406, 406 of the multilayer film F are overlapped with each other to form a vertical seal portion 402. In the multilayer film F in the present embodiment, the inner film F2 and the outer film F1 are each composed of multiple layers, and each behaves as a single film during bag making.

  The multilayer film F forming the packaging bag 401 shown in FIG. 10 of the present embodiment has two inner films F2 and outer films F1 each having a sealant layer and a base material layer, as shown in FIG. 11 (a). It is composed. As shown in FIG. 11A, the multilayer film F of the present embodiment is formed by pressing the tube-shaped multilayer film F with a roller to form a flat shape, and intermediate layers are pseudo-bonded to each other. The flat multilayer film F is stored in a state of being wound on the original fabric roller R. For this reason, as shown in FIG. 11B, the multilayer film F supplied from the original fabric roller R during the manufacturing process of the packaging bag 401 has both side edges 405 and 405 of the inner film F2 and the outer film F1 continuous to each other. ing.

  Pseudo-adhesion means that adjacent layers are bonded together by an adhesive or heat fusion and are not completely integrated and hardened, but adjacent layers are adhered and in a flexible state. Including those that are not substantially bonded. Pseudo-adhesion may be performed by bonding with low sealing strength over the entire surface between adjacent layers, or may be partially bonded to a part of the entire surface between adjacent layers. good. The preferable adhesive strength of pseudo-adhesion is 10 to 200 g / 15 mm, preferably 20 to 100 g / 15 mm, more preferably 30 to 70 g / 15 mm, as measured at a tensile rate of 50 mm / min by the 180 ° peeling method. It is.

  As shown in FIG. 11 (c), the multilayer film F supplied from the raw fabric roller R is curved into a cylindrical shape, and the both side edges 405, 405 of the multilayered film F curved in a cylindrical shape are overlapped and overlapped. . Then, the portions 406 and 406 where the side edge portions 405 and 405 are overlapped are sealed to form a vertical seal portion 402 as shown in FIG.

  As shown in FIG. 11 (d), the multilayer film F in which the vertical seal portion 402 is formed has an end face sealed at one end in a direction intersecting the vertical seal portion 402, and the lower side shown in FIG. 10 (a). A packaging bag 401 is formed in which a lateral seal portion 404 is formed and the other end portion is opened. Then, the contents are accommodated in the packaging bag 401 through the opening, and the other end portion is end-face sealed to form an upper horizontal seal portion 403 shown in FIG. 10A, and the packaging bag 401 is sealed. Thereby, the packaging bag 401 shown to Fig.10 (a) is formed. As shown in FIG. 10 (b), the vertical seal portion 402 forms a seal portion 422 by sealing the portions 406, 406 where the side edge portions 405, 405 are overlapped, and seals the overlapped portions 406, 406 together. The grip portion 421 is formed at a portion that is not. The grip part 421 is formed at the end of the seal part 422.

  As shown in FIG. 11 (d), the inner film F2 and the outer film F1 constituting the multilayer film F forming the packaging bag 401 of the present embodiment include a sealant layer 430, a base material layer 431, and a blocking layer 432. , And is configured.

  In the multilayer film F of the present embodiment, as shown in FIG. 11 (d), the blocking layer 432 constituting the inner film F2 and the blocking layer 432 constituting the outer film F1 are adjacent and pseudo-bonded. . Further, the sealant layer 430 constituting the inner film F2 and the sealant layer 430 constituting the outer film F1 are configured to be located on the outer side. Therefore, when the multilayer film F of the present embodiment is rolled into a roll on the raw roll R to form a raw film, the sealant layer 430 constituting the inner film F2 and the sealant layer 430 constituting the outer film F1 , Will come into contact.

  The multilayer film F of the present embodiment is extruded into a tube shape from the outer layer side to the inner layer side using an inflation method or the like so as to become a sealant layer, a base material layer, and a blocking layer, and is pressed into a flat shape with a roller. Thus, a multilayer film having a layer structure that becomes a sealant layer, a base material layer, a blocking layer, a blocking layer, a base material layer, and a sealant layer blocked by the blocking layer disposed in the inner layer can be formed. At this time, one side is the inner film F2 and the other side is the outer film F1 with the blocked surface of the multilayer film as a boundary. As shown in FIG. 11 (b), the film constituted by the inflation method is formed into a cylindrical shape in advance, and can be used in the form as it is manufactured, and it is not necessary to stack two films in the subsequent process. Is preferred.

  The sealant layer 430 is composed of a mixed resin in which a surfactant as a release agent is mixed with a resin having heat sealing properties.

  Examples of the resin having heat sealability include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene-α olefin copolymer polymerized using a metallocene catalyst, polypropylene, ethylene- Vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, Methylpentene polymer, polybutene polymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, acid-modified polyolefin resin obtained by acid-modifying polyolefin resin such as polyethylene or polypropylene using unsaturated carboxylic acid, poly Vinyl acetate Resins, poly (meth) acrylic resins, polyvinyl chloride resins, and other known resins and the like can be used.

  The sealant layer 430 preferably has an easy peel suitability, and is preferably composed of two or more resins having heat sealability. For example, linear low density polyethylene, ethylene resin such as ethylene-α olefin copolymer, and propylene resin such as polypropylene, ethylene-propylene copolymer, ethylene-propylene-butene terpolymer, and the like, A good easy peel can be formed by using a mixed resin containing.

  By sealing and forming the sealant layers 430 made of two or more resins having heat sealing properties, before opening the packaging bag 401 to take out the contents, the vertical seal portion 402 and the upper horizontal seal portion 403 The lower horizontal seal portion 404 does not peel off, and when the packaging bag 401 is opened, the seal portion 422 can be formed simply by grasping the grip portion 421 constituting the vertical seal portion 402 with a finger and pulling the multilayer film F. It is possible to form an agglomerated easily peelable seal in which the vertical seal portion 402, the upper horizontal seal portion 403, and the lower horizontal seal portion 404 are easily peeled off.

  The cohesive peel easy-open seal is such that the sealant layer 430 itself constituting the seal part 422 formed by sealing the sealant layers 430 shown in FIG. 11 (d) is broken and peeled off. Does not occur. For this reason, the resin which comprises the packaging bag 401 does not mix in the contents. In addition, the seal strength is stable with a smooth peeling feeling, and the temperature dependency is very small. Furthermore, a pure white peeling mark is generated on the peeling surface. This white peeling mark can be used to check the sealing status in the packaging process since it can be visually confirmed whether or not the seal is suitable. As a result, the reliability of the contents filled in the packaging bag 401 can be maintained.

  The surfactant as a release agent is added in the range of 100 ppm (parts per million) to 50000 ppm. This is because if the amount of the surfactant added is more than 50000 ppm, the amount of the surfactant bleed out increases, resulting in poor heat sealability. Further, a large amount of the release agent is transferred from the film to the bag making machine, and the film running property is deteriorated. Moreover, when the addition amount of the surfactant is less than 100 ppm, the amount of the bleed-out of the surfactant is reduced, and the content is not sufficiently peelable. The sealant layer 430 is preferably configured with a thickness of 30 to 60 μm, and more preferably configured with a thickness of 40 to 50 μm.

  Further, the release agent is preferably contained only in the sealant layer 430, that is, the outermost layer at the time of the tube-like extrusion, and thus has a release agent in the outermost outer layer and the innermost layer on the contents side when the bag is made. It will be. With such a configuration, only the layer 430 in contact with the contents and the layer 430 in contact with the bag making machine contain the release agent. Thereby, the blocking property (pseudo-adhesiveness) of the blocking layer 432 can be relatively improved compared to the layer 430 in contact with the contents and the layer 430 in contact with the bag making machine. Therefore, it is possible to improve the peelability with respect to the contents and the slippage with the bag making machine, maintain good line suitability, and at the same time seal well without shifting the blocking layer 432. is there.

  The base material layer 431 is made of a resin such as unstretched polyamide, stretched polyamide, ethylene-α olefin copolymer, polypropylene, high-density polyethylene, and linear low-density polyethylene. The base material layer 431 is preferably configured with a thickness of 10 to 30 μm, and more preferably configured with a thickness of 15 to 25 μm.

  The blocking layer 432 is a layer in contact with each other when the tube-shaped film is crushed with a roller and pressed flatly, and the blocking layers 432 are not completely welded to each other, and form pseudo adhesion. As a result, the pseudo-adhesion is peeled off from the inner film F2 and the outer film F1 when the packaging bag 401 receives an impact or the like, and behaves independently. The blocking layer 432 is made of a resin having a high blocking property so that there is no possibility of causing a gap between the inner film F2 and the outer film F1 during bag making, resulting in poor sealing or poor appearance. As the resin having a high blocking property, for example, a polyethylene-based resin can be used. The blocking layer 432 is preferably configured with a thickness of 10 to 30 μm, and more preferably configured with a thickness of 15 to 25 μm.

  In the multilayer film F of the present embodiment, a surfactant as a release agent is added to the sealant layer 430. Therefore, after the multilayer film F is formed using the above-described inflation method, the sealant layer 430 of the multilayer film F is used. A release agent coating (not shown) is formed on the side by bleeding out.

  The surfactant, which is a release agent added to the sealant layer 430, is preferably a fatty acid ester having a low HLB value as a material having a high oil content and good release properties for highly viscous contents. The HLB value is preferably 1.5 or less, and more preferably 1.0 or less. Further, it is preferably a fatty acid ester having 0 hydroxyl groups. Examples of such a material include triglyceride.

  Moreover, in order to control the bleed-out amount immediately after forming the multilayer film F and the bleed-out amount over time, it is preferable to use two or more kinds of surfactants having different melting points. As the two kinds of surfactants, it is preferable to use a surfactant that is liquid at room temperature and a surfactant that is solid at room temperature. This is because surfactants that are solid at room temperature are unlikely to bleed out, but liquid surfactants have little entanglement with resin molecules. As the agent bleeds out, the bleed out can be promoted by bleeding out the solid surfactant. In addition, the use of a solid surfactant that is difficult to bleed out allows the bleed out to proceed more slowly than a liquid surfactant alone, so a multilayer film compared to the case where only a liquid surfactant alone is used. Bleeding out immediately after F molding is suppressed, and adhesion of a release agent on the production line can be suppressed. The difference between the melting points of the two types of surfactants is preferably 10 ° C. or higher, and more preferably 40 ° C. or higher, in order to improve the peelability when filling the contents. Further, the melting point of the liquid surfactant is preferably 10 ° C. or lower, and more preferably 0 ° C. or lower. The melting point of the solid surfactant is preferably 30 ° C. or higher, and more preferably 50 ° C. or higher.

  The packaging bag 401 of the present embodiment uses a vertical pillow filling and packaging machine 200 as shown in FIG. 4, and uses a cohesive peel easy-open seal of the vertical seal portion 402, the lower horizontal seal portion 404, and the upper horizontal seal portion 403. A packaging bag 401 in which the contents W are filled in the sealed multilayer film F can be manufactured. However, since the packaging bag 401 of this embodiment uses the multilayer film F shown in FIGS. 11 (a) and 11 (b), while passing through the former 212 shown in FIG. 4, the packaging bag 401 shown in FIGS. The multilayer film F shown in FIG. 11 is curved in a cylindrical shape as shown in FIG. 11C, and portions 406 and 406 in which the side edges 405 and 405 of the multilayer film F are overlapped are formed. Then, the portions 406, 406 in which the side edges 405, 405 of the multilayer film F are overlapped are thermally welded while passing through the vertical sealing machine 213, and the vertical seal portion 402 is formed in which the inner sides of the multilayer film F are sealed together. A continuous cylindrical body 107 is formed.

  As described above, the packaging bag 401 of the present embodiment includes the release agent only in the sealant layer 430, that is, the outermost layer at the time of tube-like extrusion, so that the layer 430 in contact with the contents and the layer 430 in contact with the bag making machine. Only the release agent is included. Thereby, the blocking property of the blocking layer 432 can be relatively improved compared to the layer 430 in contact with the contents and the layer 430 in contact with the bag making machine. Therefore, it is possible to improve the peelability with respect to the contents and the slippage with the bag making machine, maintain good line suitability, and at the same time seal well without shifting the blocking layer 432. is there. In the packaging bag 401 of the present embodiment, for example, a release agent such as a surfactant with bleed-out may be added to the blocking layer 432 that is the innermost layer during tube-like extrusion. In this case, it is preferable that the blocking property is higher than the release agent added to the outermost layer, and the pseudo-adhesion is peeled off by having the release agent with bleed-out in the innermost layer during tube-like extrusion. Thereafter, when the release agent bleeds out, the films F1 and F2 can easily behave independently of the impact, and the impact resistance can be improved.

  In addition, the vertical seal portion 402, the upper horizontal seal portion 403, and the lower horizontal seal portion 404 are easy-open seals, so that when the packaging bag 401 is opened, the grip portion 421 constituting the vertical seal portion 402 is designated. By simply picking and pulling the multilayer film F, the seal portion 422 constituting the vertical seal portion 402 is peeled off, and the vertical seal portion 402, the upper horizontal seal portion 403, and the lower horizontal seal portion 404 can be easily peeled off and opened. A packaging bag 401 with good properties can be obtained.

  In the embodiment described above, as shown in FIG. 11 (c), both side edges 405, 405 of the multilayer film F are overlapped, the both side edges 405, 405 are overlapped in a flat shape, and the both side edges 405, 405 are overlapped. The sealant layers 430 of the combined portions 406 and 406 were sealed to form the packaging bag 401 shown in FIG. However, without overlapping the both side edges 405, 405 of the multilayer film F, the two side edges 405, 405 are raised so as to match each other, and the sealant layers 430 of the portions 406, 406 where the both side edges 405, 405 are overlapped It is also possible to form a packaging bag that is sealed and has a palm-and-fitting form.

  Next, a laminate type pseudo-bonded packaging bag will be described. A packaging bag 501 shown in FIG. 13 (d) is a diagram showing a laminate-type pseudo-bonded packaging bag. Sealant using multilayer film F that behaves as two multilayer films composed of outer film F3 consisting of base material layer 541, sand layer 542 and intermediate layer 543 and inner film F4 consisting of sealant layer 544 containing a release agent The layers 544 are overlapped and sealed. In the case of molding by the dry laminating method described later, the sand layer 542 is not necessarily required, and the base layer 541, the pseudo-bonded intermediate layer 543, and the sealant layer 544 are configured using an adhesive. That's fine.

  First, a configuration example of the packaging bag 501 of the present embodiment will be described with reference to FIGS. 12 and 13. FIG. 12 is a diagram illustrating a configuration example of the packaging bag 501 of the present embodiment, FIG. 12 (a) illustrates an example of the overall configuration of the packaging bag 501, and FIG. 12 (b) illustrates FIG. 12 (a). It is a figure which shows the AA cross-section structural example. FIG. 13 is a diagram showing a configuration example of the multilayer film F that forms the packaging bag 501 of the present embodiment, and a method example (gap-pasting) that forms the packaging bag 501 using the multilayer film F. FIGS. 13A and 13B show configuration examples of the multilayer film F, and FIG. 13C shows the multilayer film F shown in FIG. FIG. 13 (d) shows a state in which the portions 562 and 562 where the both side edge portions 561 and 561 of the multilayer film F are overlapped are sealed to form a vertical seal portion 502. FIG. In the multilayer film F in this embodiment, the intermediate layer 543 and the sealant layer 544 are pseudo-bonded, and the intermediate layer 543 and the sealant layer 544 are peeled off during bag making, and behave as two films.

  The packaging bag 501 shown in FIG. 12 of the present embodiment overlaps the portions 562 and 562 in which the side edge portions 561 and 561 of the multilayer film F shown in FIGS. 13B and 13C are overlapped as shown in FIG. Combine and seal. As shown in FIG. 13 (d), the multilayer film F shown in FIG. 13 has a base material layer 541, a sand layer 542, an intermediate layer 543, and a sealant layer 544, and the intermediate layer 543 and the sealant layer 544 are pseudo-bonded. Has been. The other layers are bonded together. Therefore, the multilayer film F of this embodiment behaves as two multilayer films composed of an outer film F3 composed of a base material layer 541, a sand layer 542, and an intermediate layer 543, and an inner film F4 composed of a sealant layer 544. To do. The base material layer 541 may be subjected to a printing process, and the base material layer 541 and the sand layer 542 may be configured via a printing surface.

  The pseudo-adhesive intermediate layer 543 and sealant layer 544 behave as a single film until the contents are filled, and after the packaging bag 501 is manufactured by filling the contents, an impact is applied. Then, the pseudo-adhesion is easily peeled off, and the intermediate layer 543 and the sealant layer 544 are peeled off and behave as two films. As a result, pinhole resistance, impact resistance, and tear propagation strength can be improved. In the multilayer film F of this embodiment, since the intermediate layer 543 and the sealant layer 544 are pseudo-bonded, two films can be formed when an impact is applied.

  The multilayer film F shown in FIGS. 13A and 13B can be configured using a sandwich lamination method, a dry lamination method, or the like. For example, when the multilayer film F shown in FIGS. 13 (a) and 13 (b) is formed using the sandwich lamination method, first, the film extruded into a tube shape by the inflation method that forms the sealant layer 544 including the release agent is used. Two layers of pseudo bonded films are formed by flat bonding with heat and / or pressure flatly. Then, the film constituting the base material layer 541, the intermediate layer 543, and the pseudo-bonded film constituting the sealant layer 544 are melt-bonded with a molten resin constituting the sand layer 542 extruded from a T die, and multilayered. Film F can be formed. Further, when the multilayer film F shown in FIGS. 13A and 13B is formed using the dry laminating method, the film constituting the base material layer 541, the intermediate layer 543, and the pseudo-adhesion constituting the sealant layer 544 are formed. The multilayer film F can be formed by laminating the above film with an adhesive or the like. As the adhesive, isocyanate, polyethyleneimine, titanate, urethane, or the like can be used. In the case of forming in this way, the intermediate layer 543 and the sealant layer 544 formed by the inflation method include a release agent. At this time, when the pseudo-adhesion is peeled off and behaves as two films, the films F3 and F4 are more likely to behave independently of each other after the pseudo-adhesion is peeled off, thereby improving the impact resistance. be able to.

  Various known materials can be applied to the base material layer 541. The sand layer 542 is a layer interposed between the base material layer 541 and the intermediate layer 543, and allows the base material layer 541 and the intermediate layer 543 to adhere to each other or function as a buffer material. The sand layer 542 is preferably made of, for example, a polyethylene-based resin such as low-density polyethylene or linear low-density polyethylene, and is preferably made of a resin having strength between the base material layer 541 and the intermediate layer 543. The sand layer 542 is preferably configured with a thickness of 10 to 30 μm, and more preferably configured with a thickness of 15 to 25 μm.

  The intermediate layer 543 is an intermediate layer interposed between the base material layer 541 and the sealant layer 544, and is made of the same resin as the sealant layer 544 or a resin having a high blocking property with respect to the sealant layer 544. As the resin constituting the intermediate layer 543, for example, a resin having easy peel suitability such as a mixed resin composed of two or more resins or a linear low density polyethylene resin is used. In addition, examples of resins having easy peel suitability include ethylene resins such as low density polyethylene and ethylene-α olefin copolymers, polypropylene, ethylene-propylene copolymers, ethylene-propylene-butene terpolymers, etc. And a mixed resin with a propylene-based resin. The intermediate layer 543 is preferably formed with a thickness of 30 to 60 μm, and more preferably formed with a thickness of 40 to 50 μm.

  Various known materials can be applied to the sealant layer 544. In the multilayer film F of this embodiment, at least a surfactant as a release agent as described above is added to the sealant layer 544. Therefore, after the multilayer film F is formed using the above-described sandwich lamination method, dry lamination method, or the like, a release agent coating film (not shown) is formed by bleed out on the sealant layer 544 side of the multilayer film F.

  In the packaging bag 501 of this embodiment, the multilayer film F shown in FIGS. 13A and 13B is curved in a cylindrical shape as shown in FIG. 13C and the sealant layers 544 are overlapped and welded together. 12 form the seal portion 506 of the vertical seal portion 502 shown in FIG. 12, and the upper horizontal seal portion 503 and the lower horizontal seal portion 504 in the direction intersecting the vertical seal portion 502 are formed. Further, a grip portion 505 of the vertical seal portion 502 shown in FIG. 12 is formed at a portion where the sealant layers 544 are overlapped and not welded. The grip part 505 is formed at the end of the seal part 506. The inside of the packaging bag 501 of this embodiment is filled with contents.

  The vertical seal portion 502, the upper horizontal seal portion 503, and the lower horizontal seal portion 504 of the present embodiment are the vertical seal portion 502, the upper horizontal seal portion 503, and the lower horizontal seal portion 504 before the packaging bag 501 is opened to take out the contents. The seal part 504 does not peel off, and when opening the packaging bag 501, the seal part 506 peels off simply by grasping the grip part 505 constituting the vertical seal part 502 with a finger and pulling the multilayer film F, An agglomerated easily peelable seal in which the vertical seal portion 502, the upper horizontal seal portion 503, and the lower horizontal seal portion 504 are easily peeled can be configured.

  The packaging bag 501 of this embodiment is a multilayer film F sealed by a vertical seal portion 502, a lower horizontal seal portion 504, and an upper horizontal seal portion 503 using a vertical pillow filling and packaging machine 200 as shown in FIG. A packaging bag 501 in which the contents W are filled in the bag can be manufactured. However, since the packaging bag 501 of the present embodiment uses the multilayer film F shown in FIGS. 13A and 13B, while passing through the former 212 shown in FIG. 4, FIGS. 13A and 13B. The multilayer film F shown in FIG. 13 is curved in a cylindrical shape as shown in FIG. 13C, and portions 562 and 562 in which both side edges 561 and 561 of the multilayer film F are overlapped are formed. Then, the portions 562 and 562 where the both side edge portions 561 and 561 of the multilayer film F are overlapped are thermally welded while passing through the vertical sealing machine 213, and the vertical seal portion 502 is formed in which the inner sides of the multilayer film F are sealed together. A continuous cylindrical body 107 is formed.

  As described above, the packaging bag 501 of the present embodiment includes the release agent in at least the sealant layer 544, so that the contents W have good peelability, and the pseudo-adhesion is peeled off and each behaves as two films. In addition, since the release agent bleeds out, the films F3 and F4 can easily behave independently of the impact after the pseudo-adhesion is peeled off, and the impact resistance can be improved.

  The above-described embodiments and examples are preferred embodiments and examples of the present invention, and the scope of the present invention is not limited only to the above-described embodiments and examples, and does not depart from the gist of the present invention. Implementation in a form in which various changes are made in the range is possible. For example, the technical scope of the present invention is not limited to the scope described in the above embodiment, and various changes or improvements can be added. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  This application claims priority based on Japanese Patent Application No. 2011-092420 filed on April 18, 2011, the entire disclosure of which is incorporated herein.

1, 2, 3, 4, F Multi-layer film 11, 21, 31, 41, 431, 541 Base material layer 12, 22, 32, 42, 430, 544 Sealant layer 13, 23, 33, 43 Release agent coating 24 Substrate roughened surface 432 Blocking layer 542 Sand layer 543 Intermediate layer 101, 301, 401, 501 Packaging bag 102a, 102b, 302, 402, 502 Vertical seal part 103, 104, 303, 304, 403, 404, 503, 504 Horizontal seal

Claims (9)

  A film comprising a resin in which a release agent containing at least a surfactant that is solid at room temperature and a surfactant that is liquid at room temperature is added to a sealant layer.   The film according to claim 1, wherein all the surfactants are glycerin fatty acid full esters.   3. The layer according to claim 1, further comprising a layer in contact with the bag making machine, the surface of which is at least roughened to an arithmetic average roughness Ra ≧ 0.1 μm and a maximum height Rmax ≧ 2.0 μm. Film.   The film according to any one of claims 1 to 3, wherein the sealant layer is made of a plurality of resins having easy peel suitability.   The film according to any one of claims 1 to 4, further comprising a layer made of a resin that contracts when heated.   6. The film according to claim 5, wherein the amount of the solid surfactant added is larger than that of the liquid surfactant.   The film according to claim 1, wherein the film has a pseudo-adhered layer.   The film according to claim 7, wherein the film is formed using an inflation method and has the release agent in a layer in contact with the contents and a layer in contact with the bag making machine.   A packaging bag produced by using the film according to any one of claims 1 to 8.

Images