JP2000079968A - Package, laminate film and sealant film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package, and a laminate film and a sealant film used therefor wherein both sealability of the package and exhaustion of an internally generated pressure can be attained, it is easy to control and manufacture the package, and the package has general-purpose properties. SOLUTION: The package is constituted by heat-fusing a laminate film including a sealant film 1 and a base film 5 which are laminated via an adhesive layer wherein a vent path 28 connected through the inside and the outside of the package is formed by a non-sticking layer or a difficult-to-stick layer 2 partially provided on a face of the heat-fused part of the sealant film 1 and the base film 5 in its vicinity and a slit 3 provided on a part corresponding to the non-sticking or difficult-to-stick layer 2 in the vicinity of the heat-fused part of the sealant film 1. A space between the non-adhesive or difficult-to-stick layer 2 and the sealant film layer 1 is peeled due to an internal pressure to be the vent path.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a package, a laminate film and a sealant film. More specifically, packaging bags for packaging food and the like in a sealed state, packages such as packaging containers, laminate films for packaging and sealant films for laminate films, usually have high sealing properties, but when necessary, bags and The present invention relates to a package capable of discharging gas in a container to the outside and a film used for the package.

[0002]

2. Description of the Related Art Packaging for rice, barley grains, various foods, cooked foods, clothing, bedding, and the like include packaging bags made of synthetic resin films and packaging containers made of container bodies and lids. Many are used. In these packages, air may be simultaneously enclosed when filling or inserting the article to be packaged. Further, depending on the article to be packaged, steam or gas may be generated due to heating during storage, heating during eating, or the like. In these packages, there is a possibility that the bag or the container may be ruptured due to external force due to multi-tiering or the like, generation of steam or gas inside, or the like. Increasing the thickness of the synthetic resin film to prevent this rupture may be considered, but there are limits to economical and resource saving, and the generated steam or gas may cause deterioration of the quality of the article to be packaged.

[0003] For this reason, the purpose of providing a ventilation hole in the packaging bag to penetrate the inside and outside of the bag or using a gas permeable material such as a nonwoven fabric to escape gas to the outside and prevent the bag from bursting can be achieved. . However, this method is not practical for foods and the like, because there is a possibility that the packaged articles may be oxidized and deteriorated, and foreign substances and bacteria may be mixed therein. For this reason,
A method has been proposed in which a check valve made of a tubular film is provided in a part of a seal portion of a bag. Although this method has an excellent effect on gas discharge and prevention of foreign matter from being mixed in, it is also necessary to separately prepare a film check valve, attach it to a specific position, etc. The total cost is not sufficient, for example, the process becomes complicated and the automation becomes complicated, and a new packaging form is demanded.

In order to solve these problems, a packaging bag described in Japanese Patent Publication No. Hei 8-11585 and a laminate film used for the packaging bag have been proposed. The packaging bag is formed by heat-sealing a laminated film made of a synthetic resin material in which at least a pair of adjacent synthetic resin layers cannot be heat-sealed to each other, among a plurality of bonded synthetic resin layers. In the packaging bag, a non-adhesive portion capable of revealing an air passage leading to the outside of the bag is formed in a part of the synthetic resin layer of the laminate film between the synthetic resin layers that cannot be heat-sealed. In the synthetic resin layer on the side of the bag interior space corresponding to, a communication port for connecting the air passage and the bag interior space is formed, and among the innermost synthetic resin layers facing the bag interior space, A portion of the periphery of the mouth or a portion in the vicinity thereof and a portion opposed to each other with a portion of the bag internal space interposed therebetween are thermally fused. In addition, the non-adhesive portion of the packaging laminate film is a non-applied portion of an adhesive that joins two substrate films that cannot be thermally fused to each other among the synthetic resin substrate films bonded to a plurality of layers. It is comprised with.

It can be said that this packaging bag and the laminated film used for the packaging bag are extremely excellent. However, as is clear from the description of the specification,
The laminated film is limited to a film in which the base film and the sealant film do not have heat-fusibility with each other, and has a problem that its application range is narrow. In addition, the non-adhesive portion is formed without applying an adhesive, and the non-adhesive portion is generally formed in a belt shape in the flow direction of the film for manufacturing a laminated film. For this reason,
From the relationship of the air passage formed between the laminate films,
It will be formed along the ears of the heat-sealed bag. That is, the air vents connecting the inside and outside of the bag are limited to both ends of the air passage, and it is conceivable that the deaeration is not sufficient. In addition, it is necessary to employ a special method such as waveform fusion for heat fusion at the time of bag making, and it may be difficult to adopt a general bag making line.

It is also conceivable that the non-adhesive portion, that is, the portion to which the adhesive is not applied at the time of manufacturing the laminated film, is not formed in a belt shape.
Drying, adhesion and continuous process, film running (flow)
It is substantially difficult except to form a band in the direction.
Therefore, although possible, the ventilation path communicating between the inside and outside of the bag is substantially band-shaped, and there are substantially two gas outlets to the outside of the bag. Therefore, it is considered that, in the case of a small packaging bag, the exhaust is insufficient in the case of a packaging bag of rice or the like, which limits the application field.

Further, in the above method, a non-adhesive or poorly-adhesive layer is previously formed on the base film in order to form a large number of air passages in the fused portion (side portion) of the bag. Is also conceivable. However, although this method is an excellent method, the process becomes complicated, and the base film is generally given a specific printing as a final product (packaging bag) in most cases. In that the step of forming the non-adhesive portion in a strip shape is indispensable. Therefore, the sealing property of the packaging bag and the discharging property of the pressure generated inside the bag to the outside of the bag are ensured, the production of the laminated film, the fusion-bonded bag, the filling of the contents is easy, the cost is low, and the general-purpose technology is used. There is a demand for a packaging bag manufacturing method and a packaging bag that can be used and can utilize conventional equipment.

[0008] On the other hand, a package of food or the like in which a lid material film is heat-sealed to a container body is often used. In this case, the packaged product, such as cooked food, is filled and packaged in a sealed state,
In the case of performing heat treatment in a microwave oven or the like, there is a problem in that the pressure in the container increases due to steam generated from food due to heating, and the lid film and the container body are ruptured. In order to prevent this, a hole is formed in the lid material film at the time of heating, or a part of the heat-sealed portion of the lid material film has a lower fusion strength, so that when a certain internal pressure is reached, the pressure is released. Ingenuity has been made. However, these methods, in the former, the trouble of opening a hole, the occurrence of rupture due to forgetting to open, in the latter, manufacturing before use, storage, container sealing in the transport stage becomes unstable, It is conceivable that a problem that the contents leak from the low heat fusion strength part occurs.

For this reason, a laminated film having an adhesive layer formed on a portion corresponding to a non-adhered portion of the laminated film described in Japanese Patent Publication No. HEI 8-11585, which can be peeled off at a certain pressure or more, and a container body comprising the laminated film (Japanese Patent Application Laid-Open No. 8-85580) has proposed a packaging container to be used as a cover material. Although this invention is a very excellent invention, the film constituting the laminate film is essentially the same as the invention of Japanese Patent Publication No. Hei 8-11585 in that the film constituting the laminate film is limited to a combination of resins which cannot be thermally fused to each other. The same problem still remains, and a better packaging container is desired.

[0010]

SUMMARY OF THE INVENTION Under such circumstances, the present invention is easy to manufacture, versatile, and capable of producing various types of packages (packaging bags, packaging containers, etc.), bag sizes, and container performances. Regardless, the sealing property and the exhaust property can be arbitrarily controlled according to the purpose of the package, and the package can be applied to various uses without special equipment, and the laminate used for the package can be used. It is intended to provide a film and a sealant film for a laminated film.

[0011]

The inventor of the present invention has made intensive studies on the above problems, and as a result, prior to the production of a laminated film forming a part of the packaging bag body and the lid for the container body,
After partially forming a non-adhesive or poorly-adhesive layer on the laminated surface of the sealant film, slitting it, and using a laminated laminated film, heat-sealing the area including this part to form a bag. Alternatively, it has been found that the number of openings communicating with the outside of the package, the hermeticity and the exhaustability can be arbitrarily controlled by using a packaging container, and the production is easy, and the present invention has been completed.

That is, the present invention provides: (1) a package formed by heat-sealing a laminated film in which a sealant film and a base film are laminated via an adhesive layer, wherein the heat-sealed portion of the sealant film is A non-adhesive or hardly-adhesive layer partially provided on the surface of the base film side in the vicinity thereof, and a non-adhesive or hardly-adhesive layer provided near the heat-sealed portion of the sealant film in a portion corresponding to the non-adhesive or hardly-adhesive layer A package in which an air passage communicating with the inside and outside of the package can be formed by the provided slit. (2) The package according to the above (1), wherein the package is a packaging bag. (3) The package according to the above (1), wherein the package is a packaging container. (4) A laminate film formed by laminating a sealant film and a base film via an adhesive layer to form a package by heat fusion, the base film being in a heat-sealed portion of the sealant film and in the vicinity thereof A laminate film in which a non-adhesive or poorly-adhesive layer is partially provided on the side surface. (5) The laminated film according to the above (4), wherein slits are continuously or intermittently provided in a portion corresponding to the non-adhesive or hardly-adhesive layer in the vicinity of the heat-sealed portion of the sealant film. (6) The laminate film according to the above (4) or (5), wherein the non-adhesive or hardly-adhesive layer is formed in a comb shape.
And (7) a sealant film laminated with the base film and used to form a package by heat fusion,
This is a sealant film in which a non-adhesive or poorly-adhesive layer is partially provided on the heat-sealed portion and the surface of the base film side in the vicinity thereof.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a case where a package is formed by heat-sealing a package using a laminate film obtained by laminating a base film and a specific sealant film via an adhesive. Body, laminate film and sealant film. In this case, a non-adhesive portion is formed between films having no heat-fusing property, and an air passage is formed using the non-adhesive portion. This is essentially different from the technique of Japanese Patent No. 85580. The invention described in these publications is characterized in that the base film and the sealant film are composed of a combination of films having no heat-fusing property.
That is, a feature is that a non-adhesive portion is provided between the base film and the sealant film, and the non-adhesive portion is used to form an air passage inside and outside the bag. Therefore, if the non-adhesive portion is heat-sealed at the time of bag making or sealing of the lid material film, an air passage cannot be formed, so that the film between both films is limited to a film having no heat-sealing property. That is.

According to the invention, the invention described in the above-mentioned publication intends to form a non-adhesion portion without applying an adhesive at the time of lamination, but changes the idea to provide a pre-process for producing a laminate film. A film constituting the inner surface of the package, that is, a sealant film (heat sealing film)
On the other hand, a non-adhesive or hardly-adhesive layer is to be formed between a sealant film and an adhesive layer for lamination. Here, the non-adhesive or poorly-adhesive layer is a sealant film or a sealant film when an internal pressure of the package is generated when the sealant film is finally sealed as a package by heat fusion. This means that peeling occurs between any of the layers with the adhesive layer, and that air permeability is exhibited. in this case,
It is preferable to adopt a configuration in which peeling occurs between the non-adhesive or poorly-adhesive layer and the sealant film layer.

[0015] This makes it possible to easily form the peelable portion in an arbitrary pattern and to apply the adhesive as compared with the conventional case, as compared with the case where the portion where the adhesive is not applied is formed and laminated. General processes can be adopted. Further, unlike the case where the air passage is formed in a portion where the adhesive is not applied, the air passage is generated only by peeling between the layers, and has excellent sealing properties. Further, as in the technique described in the above-mentioned publication, the base film and the sealant film are not limited to a combination made of a non-heat-fusible resin, and are further used as heat-sealing (heat sealing) at the time of bag making. Without adopting special forms and means, general bag making means can be adopted,
As in the case of the container, it is characterized in that it is not necessary to separately provide an adhesive layer so as to be capable of peeling and opening.

Further, the partial formation of the non-adhesive or poorly-adhesive layer on the sealant film can be carried out in a process similar to various printing means generally used for the film, and can be carried out in a manner similar to the application and bonding of the adhesive. Simple and with few problems.
Therefore, apart from the manufacturing process of the laminate film,
It is also possible to form a non-adhesive or poorly-adhesive layer on a sealant film in advance, and to laminate this in another laminated film manufacturing process.

Hereinafter, the present invention will be described with reference to a sealant film, a laminated film obtained by laminating the sealant fill and a base film, a packaging bag and a packaging container produced by laminating the laminated film, based on the order of the manufacturing process of the package. This will be specifically described. The sealant film of the present invention is a film that is laminated on a base film with an adhesive regardless of its heat-sealing property, and is used at the time of bag-making or as a lid material to exhibit heat-sealing property to the container body. Therefore, although it differs depending on the partner resin, it is preferable that the synthetic resin film has a heat-fusing property at a relatively low temperature and expresses a strong heat-fusing strength.

Examples of the resin for the sealant film include a linear low-density ethylene-α-olefin copolymer, a high-pressure low-density polyethylene, an ethylene-vinyl acetate copolymer,
Soft polypropylene, polyethylene produced with a metallocene catalyst, ethylene-α-olefin copolymer, polypropylene and the like are preferred. Among them, a copolymer of ethylene having a density of 0.89 to 0.94 g / cm ³ and an α-olefin such as butene-1, hexene-1, and octene-1 is preferable. For a sealant film, the mixture or density of these resins is 0.90 g.
/ Cm ³ or less of an ethylene-α-olefin copolymer or the like.

The sealant film may be a multilayer film of two or more layers made of another resin, the same kind of resin, or a similar resin as long as it has a layer that can be heat-sealed. That is, a multilayer film composed of layers having different resin and additive formulations may be used as a sealant film for the purpose of moldability, handleability, adhesion to a base resin, and the like. These single-layer films and multilayer films are manufactured by T-die extrusion molding and inflation molding.

The sealant film of the present invention comprises a non-adhesive or poorly-adhesive layer on the heat-sealed portion serving as a package as a laminate film and on the surface of the base film side (anti-heat-sealed surface side) near the heat-sealed portion. Are partially formed. That is, by partially forming the non-adhesive or poorly-adhesive layer, in the next laminating (lamination) step with the base film, heat-sealing can be performed without forming the non-applied portion of the adhesive. Later, non-adhesive or peelable light adhesion (including tackiness) between the sealant film surface and the adhesive layer is enabled. Here, the material forming the non-adhesive or poorly adhesive layer is not particularly limited as long as it is a material that inhibits the adhesiveness between the sealant film and the adhesive at the time of lamination.
For example, coating agents and printing inks containing silicone oil, silicone resin, calcium carbonate, magnesium carbonate and the like can be exemplified. These are, of course, appropriately selected depending on the laminating surface of the sealant film and the type of adhesive used in the laminating step.

As a method of partially forming a non-adhesive or poorly-adhesive layer on a sealant film, known methods include applying the above-mentioned material in a dot form, or dissolving or dispersing it in a solvent. Transfer method in the same manner as the printing method such as gravure printing and flexographic printing. For example, silicone oil, silicone resin, calcium carbonate, magnesium carbonate, and the like are dissolved or dispersed in an organic solvent such as ethyl acetate or alcohol containing a binder resin, and are gravure-printed on the sealant film laminate side. Can be partially formed. The spacing, size, and thickness of the package can be determined by appropriately designing the use, purpose, and size of the package. The thickness of this layer may be any thickness as long as it is uniform in the range to be applied,
Usually, it is in the range of 0.1 to 5 μm.

Here, the formation pattern of the non-adhesive or hardly-adhesive layer is not particularly limited, and can be appropriately selected in consideration of the size of the package, sealing, and deaeration functions. An example of a non-adhesive or poorly-adhesive layer forming pattern will be described with reference to the drawings. 1 and 2 conceptually show typical examples. In the drawings, reference numeral 1 denotes a sealant film;
Is a non-adhesive or poorly-adhesive layer, 2a is a strip portion, 2b is a branch portion, XX is a slit position formed in the sealant film at the time of laminating in the next step, and YY is a side when a package is to be formed. The planned cutting lines at the ends are shown. FIG.
(A) is a comb-shaped sealant film in which a non-adhesive or poorly-adhesive layer is deformed into a sealant film, that is, a band-shaped portion 2a continuous in the longitudinal direction of the film and a branch portion 2b continuous in the band-shaped portion.
It is a plurality formed at a specific pitch. According to this pattern, the non-adhesive or poorly-adhesive layers are dispersed in the branch portions based on the band-shaped air passages inside and outside the package.

FIG. 1B shows a case where a non-adhesive or poorly-adhesive layer is formed only on the branch portion 2b in FIG. 1A. That is, a plurality of air passages inside and outside the package are independent. Here, the angle of the branch portion with respect to the longitudinal direction of the film is not particularly limited, but is preferably in the range of 20 to 70 degrees. This angle is, of course, the width of the branch, the length, the pitch of the branch, the thickness of the film, the size of the bag, the use of the bag,
It is determined by comprehensively considering the size of the container, the use of the container, and the like. The formation of the non-adhesive or poorly-adhesive layer on the sealant film of the present invention, as shown in FIG.
The ends of the two packages may be formed simultaneously, or may be formed in a plurality of rows in the longitudinal direction of the film. In the drawings, a continuous pattern is shown in the longitudinal direction of the film, but the pattern may be formed discontinuously. In this case, when used as a lid material for a packaging container, the shape may conform to the shape (square, round) of the flange of the container, and the pattern may correspond to a part of the heat-sealed portion.

Here, the pattern of the non-adhesive or hard-adhesive layer can be appropriately selected depending on the contents to be put in the packaging bag or the packaging, the size, the thickness of the laminate film, and the like. As a part, 2-40
mm, preferably 4-30 mm in width, 1-30 mm, preferably 5-20 mm in length. The pitch is usually 2 to 80 mm, preferably 5 to 50 mm.

The sealant film of the present invention can be formed as a semi-finished product having a non-adhesive or poorly-adhesive layer having the above-mentioned pattern formed thereon, and can be laminated at a laminate film manufacturing plant. However, in general, it is preferable to incorporate it as a pre-process of the production of a laminated film described below. Thereby, the laminated film of the present invention can be easily produced for any base film by the conventional laminating process and equipment. Further, as the sealant film of the present invention, a continuous or discontinuous slit is formed in the sealant film before and after the formation of the non-adhesive or hardly-adhesive layer in order to form an air passage with the inside of the package. It can also be. Here, the slit is not particularly limited as long as it has a function of an air passage. Therefore, continuous, discontinuous linear, parallel to the longitudinal direction of the film, continuous, discontinuous linear with an appropriate angle in the intersecting direction, and even changed to linear, even those formed with a certain width Good.

Next, using the above-mentioned sealant film,
The laminate film will be described. The laminate film of the present invention is obtained by bonding a base film and a sealant film with an adhesive, laminating and compounding,
It is a composite film used as a part of a main body of a packaging bag and a lid material of a packaging container. Here, as the base film, there is a single-layer or multi-layer film having strength, rigidity, heat resistance, gas barrier properties or a plurality of these properties depending on the use of the package. Examples of the base film include polyethylene films, polypropylene films, stretched polypropylene films, stretched polystyrene films, stretched nylon films, saponified ethylene-vinyl acetate copolymer films, stretched polyester films, polycarbonate films, and inorganic filler-containing films. Layer film, or resin for these films, multilayer film with other resin, furthermore, these single layer, multilayer film with polyethylene film, linear low density polyethylene film, polypropylene film, flexible polypropylene film and the like And the like.
Further, these base films may be subjected to vapor deposition of a metal such as aluminum, gas barrier resin coating, back printing, and the like. Further, the material such as aluminum foil, paper, or a composite film of these and a resin film is not particularly limited.

Next, the laminated film of the present invention and a production example thereof will be described with reference to the drawings. For simplicity, the base film is back-printed (LLDPE side) on a multilayer film (thickness: 55 μm, width: 500 mm) composed of a stretched nylon film and LLDPE (linear low-density polyethylene). The sealant film is an LLDPE film having a thickness of 70 μm. FIG. 3 is a perspective view illustrating the concept of forming a laminate film. In FIG. 3, reference numeral 1 denotes a sealant film, which
The non-adhesive or non-adhesive layer 2 is partially formed.

In addition, a slit 3 penetrating the sealant film is discontinuously formed in the non-adhesive or hard-adhesive layer 2. On the other hand, the base film 5 is LL
DPE: The adhesive 4 for dry lamination is applied to the entire surface of the side surface 5b. Then, after the adhesive is dried, it is laminated to form a laminate film. The portion of the laminate film where the non-adhesive or poorly-adhesive layer is formed is a non-adhesive or poorly-adhesive layer when heat-sealed in the vicinity of other films, container flanges and the like to form a package. For example, between the sealant film layers, non-adhesion or easy peeling is caused by the internal pressure of the package, and the slit 3 of the sealant film forms an air passage communicating with the inside and outside of the package. However, in a normal state, the hermeticity is ensured when the ventilation path is closed.

Next, a case where the laminated film of the present invention is manufactured by a dry lamination method will be described. FIG.
As shown in (1), the base film 5 fed from the first roll 6 is guided to the coating portion 7, and adhered to the LLDPE: 5b side surface of the base film 5 by the coating roll 9 and the rubber roll 10 immersed in the adhesive 8. Apply the agent.
Next, it is introduced into the drying unit 11 and dried. On the other hand, the sealant film 1 unwound from the second roll 12
Is applied to the non-adhesive or hardly-adhesive layer forming portion 13 and is immersed in an application agent 14 and applied by an application roll 15 and a rubber roll 16 having an application surface protruding. Next, after passing through the drying unit 17 as required, the slit is slit by a slit forming cutter 18.

The base film 5 and the sealant film 1 which have been subjected to the respective pretreatments are guided to a laminating section 19, where the two films are bonded and laminated by a heating roll 20 and a rubber roll 21, and cooled by a cooling roll 22. The laminate film 23 is wound by a third roll 24. Here, adhesives applied to the base film include urethane-based, vinyl acetate-based, and rubber-based adhesives, and are used as an organic solvent solution. Here, the applied thickness of the adhesive is usually in the range of 1 to 10 μm, preferably 2 to 5 μm.

As a means for forming the non-adhesive or poorly-adhesive layer, a known printing method such as gravure printing or flexographic printing can be adopted as described above. Also,
As the coating agent, ethyl acetate containing a binder resin,
A solution in which silicone oil, silicone resin, calcium carbonate, magnesium carbonate, or the like is dissolved or dispersed in an organic solvent such as alcohol is used. The thickness of the non-adhesive or poorly-adhesive layer can be arbitrarily determined in the range of 0.1 to 5 μm so that non-adhesion or easy peeling is exhibited.

The sealant film of the present invention has a non-adhesive or poorly-adhesive layer formed on the substrate film side (laminated surface), that is, the sealant film and the non-adhesive or hard-adhesive layer are usually It is characterized in that it becomes non-adhesive or hard-adhesive and exhibits non-adhesiveness or peelability when a package is formed. In addition, this releasability is manifested after being heat-sealed as a package, and a sealant film, even if there is a certain degree of adhesion at the time of production of a laminate film, there is a case where the adhesion is reduced by heat fusion. included.

[0033] Thus, a non-adhesive portion or an easily peelable portion is formed, thereby making it possible to stably achieve both the sealing performance inside and outside the package and the air permeability when the package is formed. It is. Therefore, conversely, if a non-adhesive or poorly-adhesive layer is formed on the surface of the base film, no ventilation portion is formed, and the effect of the present invention is not achieved at all. Also, as a combination with the adhesive non-applied part,
When a non-adhesive or poorly-adhesive layer is formed on the substrate film surface, even if a non-adhesive or poorly-adhesive layer is formed, the solvent in the adhesive of the dry laminate increases the adhesive strength, The heat of fusion at the time of forming the package further increases the adhesive strength, and makes it difficult to exhibit releasability.

Next, the package of the present invention will be described.
FIG. 5 is a plan view of a packaging bag which is an example of the package of the present invention. FIG. 6 is a sectional view of a packaging container which is another example of the package of the present invention. FIG. 7 is a cross-sectional view of the heat-sealed portion explaining the formation of the inside and outside ventilation passages when the internal pressure of the package increases. In FIG. 7, a laminated film 25 is a general simple laminated film [thickness: 110 μm, LLD
PE: 95 μm, nylon: 15 μm]. The packaging bag of the present invention is made of the synthetic resin laminate film 23 of the present invention.
And a general laminated film 25 are heat-fused in a bag shape so that the part of the laminated film 23 of the present invention where the non-adhesive or poorly-adhesive layer is partially formed is at least a part of the bag. It is obtained by this. FIG.
In the figure, 26 is a gas permeable heat-sealing portion, and 27 is a general heat-sealing portion. That is, a laminate film formed by bonding a sealant film surface partially having a non-adhesive or poorly-adhesive layer and a base film via an adhesive layer is heat-sealed in the vicinity of the non-adhesive or poorly-adhesive layer. Thus, a packaging bag is formed.

FIG. 7 shows that the pressure inside the packaging bag rises, the sealant film and the non-adhesive or poorly-adhesive layer are peeled off, and the slits 3 formed in the sealant film form the air passages 28 inside and outside the bag. The state of the formed packaging bag is shown. In the packaging bag of the present invention, the part where the non-adhesive or hardly-adhesive layer is formed usually has a structure in which the non-adhesive or hardly-adhesive layer and the sealant film are apparently laminated. However, when the internal pressure of the bag is increased, the interface between the band portion 2a of the non-adhesive or hardly-adhesive layer and the sealant film 2b near the heat-sealed portion 26 is apparently caused by the pressure from the slit 3. In the upper peel state, the air passage 28 is formed, and the internal pressure of the bag is released. As shown in FIG. 7, the band-shaped heat fusion during bag making is usually in a range from the middle line of the non-adhesive or hardly-adhesive layer 2b to a position just before the slit 3 of the sealant film. Although the case of the packaging bag has been described, the operation mechanism is the same in the case of the packaging container of FIG.

The sealant film, laminate film and package of the present invention have been described above. However, in addition to the above, as slits formed in the sealant film, in addition to continuous or intermittent slits parallel to the longitudinal direction of the film, intermittent slits in oblique directions may be used. The lamination method may be a dry lamination method, a hot melt lamination method, a thermal lamination method, or the like, but the dry lamination method using the above-mentioned adhesive can be preferably used. Furthermore, as a fusion method at the time of bag making, a joint seal other than a laminated seal may be used, and the position of the ventilation seal may be a joint seal on one side, two sides, three sides, or the center of the packaging bag. In the case of a packaging container, a part of the container may have the ventilation path forming mechanism of the present invention. Further, the packaging body may be in a packaging form that cannot be clearly distinguished from a packaging bag or a packaging container.

The formation of the air passage has been described mainly on the mode in which the non-adhesive or hardly-adhesive layer and the sealant film or the laminating adhesive layer are peeled off when the internal pressure of the package increases. . However, the present invention
The purpose of the package is to finally achieve both sealing performance and formation of a ventilation path by internal pressure. Therefore, depending on the application such as packaging of rice, etc., in order to facilitate formation of the ventilation path, the sealant film and the non-adhesive or hardly-adhesive layer near the slit formed in the sealant film before the internal pressure is increased. The film may be in a state where it has been peeled in advance.

[0038]

According to the present invention, a package having stable airtightness and an air passage for depressurization when the pressure inside the package (bags, containers, etc.) is increased, thereby exhibiting the performance of deaeration is provided. can get. Further, the formation of this ventilation path is to form a non-adhesive or poorly-adhesive layer on the sealant film,
It can be easily formed by a process similar to printing on a film. In addition, it is a pre-treatment for a sealant film, and is highly versatile, unlike a treatment for a base film that has been subjected to printing or the like for each application. Further, since the adhesive is applied over the entire surface of the laminated film, the adhesive can be manufactured with ordinary equipment, and apparently there are no voids at the adhesive interface of the laminated film, as compared with the method of forming an uncoated portion of the adhesive. Therefore, the sealing property is high and the preservability of the article to be packaged is good. In addition, conventional methods can be employed for bag making and sealing of the lid material. As a result, it is possible to easily obtain a package that can achieve both stable sealing properties and depressurizing properties.

[Brief description of the drawings]

FIG. 1 is a plan view showing the concept of a pattern of a non-adhesive or poorly-adhesive layer formed on a sealant film.

FIG. 2 is a plan view showing the concept of another example of a pattern of a non-adhesive or poorly-adhesive layer formed on a sealant film.

FIG. 3 is a perspective view illustrating the concept of forming a laminate film.

FIG. 4 is a schematic view showing production by a dry lamination method.

FIG. 5 is a plan view of a packaging bag.

FIG. 6 is a sectional view of a packaging container.

FIG. 7 is a cross-sectional view of a heat-sealed portion for explaining formation of an inside / outside air passage.

[Explanation of symbols]

 1: Sealant film 2: Non-adhesive or poorly adhesive layer 3: Slit 4: Adhesive layer 5: Base film 6: First roll 7: Coating part 8: Adhesive 9: Coating roll 10: Rubber roll 11: Drying Part 12: Second roll 13: Non-adhesive or poorly adhesive layer forming part 14: Coating agent 15: Coating roll 16: Rubber roll 17: Drying part 18: Slit forming cutter 19: Laminating part 20: Heating roll 21: Rubber roll 22: Cooling roll 23: Laminated film 24: Third roll 25: General laminated film 26: Air-permeable heat-sealed part 27: General heat-sealed part 28: Ventilation path 29: Container body 30: Lid material film

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) JL12A

Claims (7)

[Claims] 1. A package formed by heat-sealing a laminate film in which a sealant film and a base film are laminated via an adhesive layer, wherein the heat-sealed portion of the sealant film and the base film side in the vicinity thereof Non-adhesive or hard-adhesive layer partially provided on the surface of the package, and a slit provided in a portion corresponding to the non-adhesive or hard-adhesive layer in the vicinity of the heat-sealed portion of the sealant film, the package body. A package in which an air passage communicating with the inside and outside of the container can be formed. 2. The package according to claim 1, wherein the package is a packaging bag. 3. The package according to claim 1, wherein the package is a packaging container. 4. A laminate film formed by laminating a sealant film and a base film via an adhesive layer to form a package by heat fusion, wherein a base material in a heat fusion portion of the sealant film and its vicinity is provided. A laminate film in which a non-adhesive or poorly-adhesive layer is partially provided on the surface on the material film side. 5. The laminated film according to claim 4, wherein a slit is provided continuously or intermittently in a portion corresponding to the non-adhesive or poorly-adhesive layer in the vicinity of the heat-sealed portion of the sealant film. 6. The laminated film according to claim 4, wherein the non-adhesive or hard-adhesive layer is formed in a comb shape. 7. A sealant film laminated on a base film and used for forming a package by heat fusion, wherein the sealant film is non-adhesive or difficult to adhere to the heat fusion portion and the surface of the base film side in the vicinity thereof. Sealant film partially provided with adhesive layer