JP7400214B2 - Vacuum tight packaging - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vacuum tight package.

Conventionally, vacuum seal packaging has been known for packaging processed livestock products such as ham, sausage, and bacon, processed dairy products such as cheese, semi-fresh sweets, agricultural products such as vegetables, and processed marine products such as kamaboko.

This vacuum seal packaging involves placing the food on a plastic film, etc., covering it with another plastic film, degassing it, and then seal-packing it, which saves the trouble of bagging the food. It can exert effects such as preventing food oxidation, maintaining quality, and preventing the invasion and proliferation of microorganisms.

As an example of a package using this vacuum tight packaging, Patent Document 1 describes that processed water and livestock products with a content of 15% or more are vacuum packaged using a multilayer film laminated with at least one layer of shrink film, and then heated and heated. A package for processed fish and livestock products has been proposed in which the bag is contracted in close contact with the contents.

Japanese Patent Application Publication No. 60-47632

According to the invention described in Patent Document 1, by controlling the degree of heating treatment (75 to 125°C), it is possible to control the shrinkage rate between 3 and 20% depending on the type of product and package it. As a result, the film can be brought into close contact with the product, eliminating any space, and preventing water syneresis and build-up from occurring at wrinkled areas.

However, in conventional vacuum seal packages including those described above (see the plan view of the first embodiment of the conventional vacuum seal package shown in FIG. 9), the package If the backing material and the front material film that make up the package are in close contact with each other, it may be difficult to remove the contents even if the package is opened through a notch provided in advance in the package to remove the contents from the package. There is a problem.

Specifically, even if the package is opened by cutting from the notch etc., the contents cannot be taken out as the front and backing films are in close contact with each other. In order to separate the front and backing films and let air into the package, it is necessary to forcefully move the front and backing films with one's fingers, and this action is quite difficult for consumers. It is a complicated task.

Therefore, the present invention provides a vacuum tight package in which the unsealed portion of the package main body where the front material and the backing material are in close contact can be separated easily, making it easy to open and take out the contents. That is the issue.

The invention according to claim 1 is a vacuum tight package that is formed by sealing a front material and a backing material and stores the contents, and the unsealed part where the front material and the backing material are not sealed. A folded part formed by two films constituting the front material or the backing material is provided at a position including the part, and the folded part has an easy peel layer and the two films constituting the front material or the backing material. The film is formed by folding each of the films with the easy-peel layer side mountain-folded and stacking them facing each other with the easy-peel layer inside, and is provided in an area excluding both ends of the top end of the folded part. and an unsealed portion that is not in contact with an edge other than the top end of the folded portion .

The invention according to claim 2 is the vacuum tight package according to claim 1, wherein the folded portion is provided at a position in contact with a part of the contents.

The vacuum tight package according to the present invention has a folded part formed by two films constituting the front material or the backing material at a position including a part of the unsealed part where the front material and the backing material are not sealed. The folding part has an easy-peel layer and folds two films constituting the front material or the backing material with the easy-peel layer side mountain-folded, and folds the two films facing each other with the easy-peel layer inside. They are formed by being stacked facing each other, and have an unsealed portion.

As a result, the vacuum sealed package is opened starting from the unsealed part of the folded part, and the film seal that makes up the folded part is peeled off to the unsealed part of the package body, and at the same time, air is released into the vacuum sealed package. enter. Then, in the unsealed portion of the package main body, the close contact between the front material and the backing material is broken and pulled apart, making it easier to open the vacuum tight package and take out the contents.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a first embodiment of a vacuum tight package of the present invention. FIG. 2 is a schematic cross-sectional view taken along line AA of the vacuum tight package of FIG. 1. FIG. FIG. 3 is an explanatory diagram showing an example of the layer structure of the front material and backing material of the vacuum tight package of the present invention. FIG. 2 is an explanatory diagram showing an example of the vacuum sealed package of FIG. 1 in an unsealed/opened state. It is a top view which shows the second embodiment of the vacuum tight packaging body of this invention. FIG. 6 is a schematic cross-sectional view taken along line BB of the vacuum-tight package shown in FIG. 5; FIG. 6 is an explanatory view showing an example of the vacuum sealed package of FIG. 5 in an unsealed/opened state. It is a top view which shows the third embodiment of the vacuum tight packaging body of this invention. FIG. 2 is a plan view showing a first embodiment of a conventional vacuum tight package. It is a top view which shows the second embodiment of the conventional vacuum tight packaging body.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of embodiments of vacuum tight packaging according to the present invention will be described below with reference to the drawings as necessary.

FIG. 1 is a plan view showing a first embodiment of a vacuum tight package 50 of the present invention. FIG. 2 is a schematic cross-sectional view of the vacuum tight package 50 of FIG. 1 taken along line AA. FIG. 3 is an explanatory diagram showing an example of the layer structure of the front material 1 and the backing material 2 of the vacuum tight package 50 of the present invention. As shown in FIG. 1, the vacuum tight packaging body 50 of the present invention is formed by sealing a front material 1 provided with a folded portion 11 and a backing material 2, and is a vacuum tight packaging body containing contents 15. It is.

As shown in FIG. 1, the contents 15 are sandwiched between the front material 1 and the back material 2, the four flange parts 6, 7, 7, 8 are sealed by the front material 1 and the back material 2, and the top seal part 3, A base seal portion 5 and left and right side seal portions 4, 4 are formed and sealed in a deaerated packaging state. Furthermore, in the area surrounded by the left and right side seal parts 4, 4, the top seal part 3, and the bottom seal part 5, there is an unsealed part 10 of the package body where the front material 1 and the back material 2 are not sealed. It is formed.

When the folding part 11 is provided in the cover material 1 as shown in FIG. 1, the layer structure of the cover material 1 shown in FIG. It refers to each layer structure of 1b. Further, when the folding portion 11 is provided in the cover material 1, an easy peel layer 33 is provided on the content side of each of the two films 1a and 1b that constitute the cover material 1. Note that it is sufficient that at least the fold-in portion 11 has the easy-peel layer 33.

Further, in a position including a part of the unsealed part 10 where the front material 1 and the back material 2 are not sealed, an upper film 1a that constitutes the front material 1 and a lower film 1b that constitutes the front material 1 are formed. A folding part 11 is provided, and the folding part 11 folds the two films 1a and 1b constituting the cover material 1 with the easy-peel layer side thereof mountain-folded, and faces each other with the easy-peel layer inside. They are formed by overlapping each other. The two films 1a and 1b constituting the cover material 1 are bonded together by sealing at least a portion of the overlapped portions. Therefore, the folded portion 11 has an unsealed portion 12 where the two films 1a and 1b constituting the cover material 1 are not sealed.

By forming the easy-peel layer 33 at the part where the two films 1a and 1b constituting the cover material 1 are bonded together, the seal can be easily peeled off when opening the package from the folded part 11. In addition, the seal part in the part where the two films 1a and 1b constituting the front material 1 are overlapped is provided so that the contents 15 are sealed when the front material 1 and the back material 2 are pasted together. It will be done. Here, "opening" refers to peeling off a part of the sealed vacuum package 50 in which the film serving as the front material 1 and the film serving as the backing material 2 are sealed together to check the sealed state of the package. Say what you want to know.

In FIG. 1, as a first embodiment of the vacuum tight package 50, the contents 15 are stored almost in the center of the vacuum tight package 50, and the folded part 11 of the cover material 1 is connected to the top seal part 3 and the contents. Although the folded portion 11 of the cover material 1 is provided between the objects 15, it is only necessary that the folded portion 11 of the cover material 1 is provided at a position that includes a part of the unsealed portion 9 of the package body. In the folding part 11, a part where the two films 1a and 1b constituting the front material 1 are not sealed (hereinafter referred to as the unsealed part 12 of the folding part) is provided in a part of the top end 13 of the folding part. It is provided in a substantially mountain shape that draws an arc upward when the folded portion 11 is folded with the top end 13 of the folded portion facing downward.

By opening the vacuum seal package 50 starting from the unsealed part 12 of the folded part, when opening the vacuum seal package 50, the close contact between the films of the front material 1 and the back material 2 is released. This makes it easier to pull apart and take out the contents 15. Here, "opening" refers to loosening the close contact between the films of the front material 1 and the back material 2, which are in close contact with each other after the vacuum seal package 50 is opened. Therefore, it is preferable that the unsealed part 12 of the folded part, which is also the so-called opening start part when opening the vacuum sealed package 50, be provided in an area that can be pinched at least with fingers.

In addition, as shown in FIG. 1, when the unsealed part 12 of the folded part is provided in a part of the top end 13 of the folded part, the shape of the unsealed part 12 of the folded part should be such that it can be easily pinched by fingers. In addition to the above-mentioned substantially mountain shape, rectangles, trapezoids, triangles, etc. are often used.

FIG. 2 is a schematic cross-sectional view of the vacuum tight package 50 of FIG. 1 taken along line AA. As shown in FIG. 2, the facing material 1 has a folded part 11, is sealed to the top flange part 6 to form the top seal part 3, and is sealed to the bottom flange part 8 to form the bottom seal part 5, and is degassed. The packaged contents 15 are sealed. As an example of this content 15, in FIG. 2, a solid content 15 having a vertically elongated oval shape when viewed from the side is housed. An unsealed portion 9 of the package body is formed in an area surrounded by the top seal portion 3, left and right side seals 4, 4, and bottom seal portion 5.

In addition, as shown in FIG. 2, the vacuum tight package 50 has the front material 1 and the backing material 2 in the area of the unsealed portion 9 of the package body due to the degassing of the air inside the vacuum tight package 50. A place 10 where the content-side surfaces of the film serving as the front material 1 and the film serving as the backing material 2 are in close contact with each other (hereinafter referred to as the front material 1 and the backing material) 2) is in close contact with the film. In the first embodiment of the vacuum tight package 50 shown in FIG. 1, the fold-in portion 11 of the front material 1 is provided at a location 10 where the front material 1 and the backing material 2 are in close contact with each other.

FIG. 4 is an explanatory diagram showing an example of the vacuum sealed package of FIG. 1 in an unsealed/opened state. FIG. 4(a) shows two films 1a and 1b constituting the cover material 1 in the unsealed part 12 of the folded part 11 provided between the top seal part 3 and the contents 15. The two films 1a and 1b are opened by holding them with the fingers of each hand and flipping them up and down. In this way, the unsealed part 12 of the folded part is also the so-called opening start part when opening the vacuum sealed package 50, and the unsealed part can be easily opened by starting from the unsealed part 12 of the folded part.

FIG. 4(b) shows the moment when the vacuum seal package 50 is opened and the folded part 11 is peeled off to the unsealed part 9 of the package body, and at the same time air enters the vacuum seal package 50. At this point, the contents 15 are not yet visible.

When opening the vacuum sealed package 50, as shown in FIG. 4(c), the seals on the left and right side seal portions 4, 4 of the film 1a constituting the cover material 1 are peeled off and turned upward. , the seals on the left and right side seal portions 4, 4 of the film 1b constituting the cover material 1 are peeled off and turned up downward.

Then, at the point 10 where the films of the front material 1 and the backing material 2 come into close contact, the films of the front material 1 and the backing material 2 are released and separated, and the vacuum tight package 50 is opened and the contents 15 are taken out. It becomes easier.

FIG. 5 is a plan view showing a second embodiment of the vacuum tight package of the present invention. FIG. 6 is a schematic cross-sectional view taken along line BB of the vacuum tight packaging shown in FIG. In one embodiment of the vacuum tight package 50 shown in FIG. 1, the fold-in part 11 is provided between the top seal part 3 and the contents 15, but in FIG. It is set in. The unsealed part 12 of the folded part is provided in a part of the top end 13 of the folded part, as in FIG. It is set up in the shape of a mountain that draws an arc.

FIG. 7 is an explanatory diagram showing an example of the vacuum sealed package of FIG. 5 in an unsealed/opened state. FIG. 7(a) shows a state in which the vacuum tight package 50 is opened. FIG. 7(b) shows the vacuum sealed package 50 in an open state after being unsealed. By providing the folding part 11 at a position in contact with a part of the contents 15, the vacuum seal package 50 can be opened using the folding part 11 as a starting point, and the two films 1a and 1b forming the folding part 11 can be removed from the package. At the same time as the unsealed part 9 of the main body is peeled off, air enters the vacuum tight package 50. Then, the contents 15 are exposed, and at the point 10 where the film of the front material 1 and the backing material 2 are in close contact, the close contact between the front material 1 and the backing material 2 is broken and separated, and the vacuum tight package 50 is opened. This makes it easier to take out the contents 15. 4, the folded part 11 of the cover material 1 is different from the unsealed/opened state of the vacuum seal package 50 provided between the top seal part 3 and the contents 15. Since the contents 15 are exposed, it becomes easier to take out the contents 15.

In addition, in order to expose the contents 15 immediately after opening, by forming notches etc. on the left and right, top and bottom positions of the contents, when cutting from the notches etc., the front material 1 and the backing material 1 are separated. It may be possible to immediately expose the contents without being affected by the close contact of the films at the location 10 where the two films are in close contact. However, cutting through the sealed contents may damage the contents or damage the shape of the soft contents. According to the present invention, by opening the vacuum seal package 50 from the folded part 11 instead of simply cutting through the contents, the contents 15 can be opened and removed without damaging the contents when the package is opened. It becomes possible to take it out easily.

FIG. 8 is a plan view showing a third embodiment of the vacuum tight package 50 of the present invention. The vacuum tight package 50 shown in FIG. 8 is different from the vacuum tight package 50 shown in FIG. 1 in the shape of the folded part 11 and the shape of the unsealed part 12 of the folded part, but the other parts are the same. Details of the shapes of the folded portion 11 and the unsealed portion 12 of the folded portion will be described below.

At one corner of each of the two films 1a and 1b constituting Table 1, an extension portion 20 of the film constituting the knob portion 19 is provided. These two films are bent with the easy-peel layer side facing each other, and overlapped with each other facing each other with the easy-peel layer inside, and a part of the overlapped portion is sealed to form a surface material. Two films 1a and 1b forming the structure are bonded together. The unsealed portion 12 of the folded portion is provided along the left and right side ends 14 of the folded portion and the top end 13 of the folded portion, including the extension portion 20 of the film.

When opening the vacuum-tight package 50 shown in FIG. 8, pinch the two films 1a and 1b forming the knob 19 provided in the unsealed part 12 of the fold-in part with the fingers of the left and right hands. , these two films 1a and 1b are turned over and opened. When opening, the seals on the left and right side seals 4, 4 of the film 1a constituting the cover 1 are peeled off and flipped upward, and the left and right seals 4, 4 of the film 1b constituting the cover 1 are peeled off. The sticker is peeled off and flipped downwards. Then, at a location 10 where the front material 1 and the back material 2 come into close contact, the close contact between the front material 1 and the back material 2 is broken and pulled apart, and the vacuum tight packaging body 50 is opened, making it easier to take out the contents 15.

By providing the knob part 19 in the unsealed part 12 of the fold-in part, the knob part 19 is not provided in the fold-in part 11 as shown in FIG. Compared to the vacuum seal package 50 provided in 13, the vacuum seal package 50 is easier to check because it is easier to confirm the location that should be the so-called opening start part, and it is also easier to turn over the two films that make up the folding part 11. , it becomes easier to open.

In the above embodiment, the folding part 11 having the unsealed part 13 as a so-called opening start part is provided on the front material 1, but the folding part 11 may be provided on the backing material 2. When the backing material 2 is provided with the fold-in part 11 having the unsealed part 12 which becomes the opening start part, the vacuum tight packaging body 50 according to the present invention has the contents of each of the two films 1a and 1b constituting the backing material 2. It has an easy peel layer 33 on the object side. In this case, the folding part 11 is formed by folding the two films 1a and 1b constituting the backing material 2 so that the easy-peel layer side is mountain-folded, and stacking them facing each other with the easy-peel layer inside. has been formed. The two films 1a and 1b constituting the backing material 2 are bonded together by sealing at least a portion of the overlapped portions. Note that it is sufficient that at least the fold-in portion 11 has the easy-peel layer 33.

FIG. 3 is an explanatory diagram showing an example of the layer structure of the front material 1 and the backing material 2 of the vacuum tight package 50 of the present invention. When providing the folding part 11 in the cover material 1, the layer structure of the cover material 1 shown in FIG. 3 refers to the layer structure of each of the two films 1a and 1b that constitute the cover material 1. When the folded portion 11 is provided in the backing material 2, the layer structure of the backing material 2 shown in FIG. 3 refers to the layer structure of each of the two films 1a and 1b that constitute the backing material 2. The facing material 1 and the backing material 2 are each made of a laminated film 16, and the laminate of the laminated films 16 constituting the facing material 1 and the backing material 2, respectively, includes, from the outer layer side, a base material layer 31, an intermediate layer. 32 and sealant layer 33 are laminated in this order. Note that the folded part 11 has an easy-peel layer 33, and when the folded part 11 is provided on the front material 1, the sealant layer 33 of the face material 1 is constituted by an easy-peel layer, and the folded part 11 is provided on the backing material 2. In this case, the sealant layer 33 of the backing material 2 is constituted by an easy-peel layer.

The base material layers 31 of the front material 1 and the back material 2 include at least low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), Films made of polyolefin resins such as ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EAA), ethylene-vinyl acetate copolymer (EVA), polypropylene (PP), polyethylene terephthalate ( Polyester resins such as PET), polyethylene terephthalate glycol copolymer (PETG), and polybutylene terephthalate (PBT) can also be used. A nylon film made of polyamide resin or the like can be used as a single layer or as a multilayer of two or more layers.

In addition, the intermediate layer 32 of each of the front material 1 and the back material 2 is made of ethylene-vinyl alcohol copolymer film (EVOH) or vinylidene chloride film (PVDC) in order to improve gas barrier properties such as oxygen barrier properties and water vapor barrier properties. ) etc. can also be stacked. Note that an ethylene/vinyl alcohol copolymer film is preferred from the viewpoint of gas barrier stability.

A nylon film can also be laminated to improve pinhole resistance. As the nylon film, for example, 6-nylon, 66-nylon, 69-nylon, etc. can be used.

For example, a five-layer coextruded laminate film of polypropylene film/adhesive layer/ethylene-vinyl alcohol copolymer film/adhesive layer/polypropylene film can be used to sterilize the contents 15 by boiling or retorting. The polypropylene film is preferably a film of polypropylene homopolymer, polypropylene copolymer, or the like.

By providing the intermediate layer 32 in the laminate forming each of the front material 1 and the backing material 2, gas barrier properties, pinhole resistance, etc. can be improved. The adhesive resin layer on which the intermediate layer 32 is laminated may be polyethylene resins such as low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, or high-density polyethylene, olefin resins such as polypropylene resin, or ethylene-vinyl acetate copolymer. Films made of ethylene-copolymer resins such as resins, ethylene-metal methacrylate copolymer resins, ethylene-ethyl acrylate copolymer resins, ethylene-acrylic acid copolymer resins, ethylene-methacrylic acid copolymer resins, and ethylene-based ionomers. Examples include. Among them, a film made of polypropylene resin is preferred.

The sealant layer 33 of each of the front material 1 and the back material 2 is comprised of an easy-peel layer in order to make it easy to peel off the seal when opening the package from the folded portion 11 when the folded portion 11 is provided. The easy peel layer can be composed of, for example, the following different types of resin A and resin B. That is, as resin A, linear low density polyethylene (L
LDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methacrylic At least one member selected from the group consisting of methyl acid copolymer (EMMA), ethylene-methyl acrylate copolymer (EMA), and ionomers thereof can be used. In particular, as resin A, ethylene-vinyl acetate copolymer (EVA) can be suitably used. On the other hand, as the resin B, polypropylene (PP) or polybutylene (PB) can be used. As the PP of the resin B, any of a random copolymer, a homopolymer, a block copolymer, etc. can be used, and among them, a random copolymer can be preferably used.

From the viewpoint of sealability and unsealability, the content of resin A and resin B is desirably 40% by mass or more, preferably 50% by mass or more, based on the mass of the entire easy-peel layer. It is desirable that the upper limit of the content is 80% by mass or less, preferably 75% by mass or less, and more preferably 60% by mass or less. On the other hand, the resin B is 20% by mass or more, preferably 25% by mass or more, more preferably 40% by mass or more, based on the mass of the entire easy-peel layer, and the upper limit is 60% by mass or less, preferably 50% by mass or less. This is desirable. By setting the content of resin A to 40% by mass or more (that is, the content of resin B to 60% by mass or less), good heat sealability can be maintained. On the other hand, by setting the content of resin A to 80% by mass or less (that is, the content of resin B to 20% by mass or more), appropriate easy peel strength can be obtained and good unsealability can be obtained.

The preferred thicknesses of the base material layer 21, intermediate layer 22, and sealant layer 23 as an easy peel layer of the above-mentioned front material 1 and back material 2 are 12 μm for the base material layer 21, 15 μm for the intermediate layer 22, and 15 μm for the easy peel layer. The sealant layer 23 as a peel layer has a thickness of 50 μm.

There are no particular restrictions on the method of manufacturing the two films 1a and 1b constituting the above-mentioned surface material 1 or backing material 2, and the film that will become the surface material 1 or backing material 2. They can be produced by laminating them simultaneously or sequentially. Specifically, a film including each layer can be produced at once by coextruding using an extruder equipped with a die using an existing method such as the T-die method or the tubular method. Alternatively, the resins constituting each layer can be formed into sheets separately, and then laminated using a wet lamination method, a hot melt lamination method, a dry lamination method, a press method, an extrusion lamination method, or the like to sequentially produce the resin.

Hereinafter, an example of a specific method for manufacturing the vacuum tightly packaged body 50 of the present invention will be explained.

First, the two films 1a and 1b constituting the surface material 1 are folded with the easy-peel layer side facing each other, and stacked on top of each other with the easy-peel layer on the inside facing each other. Two films 1a and 1b constituting the cover material 1 are bonded together by sealing at least a portion thereof.

Next, the contents 15 are placed on the sealant layer 23 side of the backing material 2, and the contents 15 are placed on top of the backing material 2 so that the sealant layer 23 side of the surface material 1 is in contact with the contents 15, so that the sealant layers 23 face each other. Then, the flange portions of the front material 1 and the back material 2 are overlapped to form the left and right side seal portions 4, 4, and the bottom seal portion 5 other than the top seal portion 3. The subsequent vacuum packaging methods can be roughly divided into the chamber method and the nozzle method, with the latter being the mainstream. The nozzle method is a method in which a nozzle is inserted into a bag, the opening other than the nozzle is held down with a sponge, etc., and the inside of the bag is evacuated using a vacuum pump. On the other hand, in the chamber method, a bag filled with contents is set in a box (chamber) that can be evacuated, the inside of the box is evacuated, and the box is hermetically sealed in this state. In manufacturing the vacuum tight package 50 of the present invention, for example, when adopting this chamber method, a bag-like item containing the contents 15 is set in the chamber with only the top portion not sealed. Then, the inside of the chamber is evacuated, and in this state, a top seal is formed to seal the contents 15. Through the above steps, a vacuum-adhesive packaged body 50 that is degassed and packaged is created.

In addition, in the embodiment of the vacuum tight packaging body 50 described above, the folding part 11 is composed of the upper film 1a and the lower film 1b that constitute the front material 1 or the backing material 2, and The package is opened by flipping it up and down. However, the folding portion 11 may be provided vertically in a plan view, and may be configured with left and right films forming the front material 1 or the back material 2, and the left and right films may be opened by turning them left and right.

Hereinafter, specific examples of the present invention will be described. In both Examples 1 and 2 and Comparative Examples 1 and 2 below, the vertical and horizontal dimensions of the vacuum sealed package 50, the contents and shape of the sealed contents 15 (here, a vertically elliptical shape in front view and side view) are as follows. It's the same.

(Example 1)
A vacuum tight package 50 shown in FIG. 1 was used. Specifically, the folded part 11 of the cover material 1 is provided between the top seal part 3 and the contents 15, and the unsealed part 12 of the folded part is a part of the top end 13 of the folded part 11. It is provided in a substantially mountain shape that draws an arc upward when the folding portion 11 is folded with the top end 13 of the folding portion 11 facing downward.

In Example 1, the layer structure of the laminated film constituting each of the front material 1 and backing material 2 of the package is as shown in Table 1. From the outer layer side, silicon oxide vapor deposited polyester (GLPET) 12 μm / nylon (NY) 15 μm/easy peel 50 μm.

(Example 2)
A vacuum tight package 50 of the present invention shown in FIG. 8 was used. Specifically, the folded part 11 of the backing material 1 is provided between the top seal part 3 and the contents 15, and the unsealed part 12 of the folded part is an extension part 20 of the film that constitutes the knob part 19. , along the left and right end portions 14 and top end portion 13 of the folded portion. When opening the vacuum seal package 50, pinch the two films 1a and 1b that make up the grip portion 19 with the fingers of each of the left and right hands, and open the two films 1a and 1b by flipping them up and down. did.

In Example 2, the layer structure of the laminated film constituting each of the front material 1 and the backing material 2 of the vacuum tight package 50 is as shown in Table 1, from the outer layer side: vapor-deposited nylon (GLNY) 15 μm/easy peel 50 μm becomes.

(Comparative example 1)
FIG. 9 is a plan view showing a first embodiment of a conventional vacuum tight package 50. As shown in FIG. As shown in FIG. 9, the contents 15 are sandwiched between the front material 1 and the back material 2, the four flange parts 6, 7, 7, and 8 are sealed by the front material 1 and the back material 2, and the top seal part 3. A base seal portion 5 and left and right side seal portions 4, 4 are formed and sealed in a deaerated packaging state. Further, an unsealed portion 9 of the package body is provided in an area surrounded by the left and right side seal portions 4, 4, the top seal portion 3, and the bottom seal portion 5. In addition, notch portions 18 are formed symmetrically in the left and right seal portions 4, 4 between the top seal portion 3 and the contents 15, spanning the front material 1 and the back material 2. An opening portion 17 is provided at a position connecting the left and right notch portions 18.

As Comparative Example 1, a conventional vacuum tight package 50 shown in FIG. 9 was used.

In Comparative Example 1, the layer structure of the laminated film constituting each of the front material 1 and the backing material 2 of the vacuum-adhesive package 50 package is as shown in Table 1. From the outer layer side, silicon oxide vapor deposited polyester (GLPET) 12 μm thick /Nylon (NY) 15 μm/Unstretched polypropylene (CPP) 50 μm.

(Comparative example 2)
FIG. 10 is a plan view showing a second embodiment of a conventional vacuum tight package 50. A conventional vacuum seal package 50 shown in FIG. 10 does not have a fold-in part 11 like the vacuum seal package 50 shown in FIG. 8, and does not have a notch part 18 for cutting. A knob 19 for opening the package by pinching it with the fingers of the hand is provided at the upper left position where 4 is tied.

Specifically, an extension 20 of the film constituting the knob 19 is provided at one corner of each of the films of the front material 1 and the back material 2. These two films are overlapped with each other facing each other with the easy-peel layer side facing inside, and the four sides of the overlapped portion (excluding the extension part 20 of the film) are sealed to form the front material 1 and the backing material. 2 are pasted together.

As Comparative Example 2, a conventional vacuum tight package 50 shown in FIG. 10 was used. As mentioned above, the knob 19 is provided at the upper left, and when opening the vacuum seal package 50, pinch the two films constituting this knob 19 with the fingers of the left and right hands, and then release the two films. The film was opened by flipping it up and down.

In Comparative Example 2, the layer structure of the laminated film constituting each of the front material 1 and the backing material 2 of the vacuum-adhesive package 50 package was the same as in Example 1, and as shown in Table 1, the oxidation Silicon vapor deposited polyester (GLPET) 12 μm/nylon (NY) 15 μm/easy peel 50 μm.

(evaluation)
Vacuum-tight packages 50 of Examples 1 and 2 and Comparative Examples 1 and 2 were created, and ten subjects monitored and evaluated the usability of each vacuum-tight package 50 when it was opened. The evaluation content was the feeling of use when the vacuum tight package 50 was opened. Regarding the feeling of use when opening this vacuum tight package 50, if 10 out of 10 people felt that it was easy to take out the contents, it was marked as ○, and if even 1 out of 10 people felt that it was difficult to take out the contents, it was marked as ×. Shown as The results are shown in Table 1.

As a result of the monitor evaluation, in Examples 1 and 2, the vacuum seal package 50 was opened starting from the unsealed part 12 of the folded part provided between the top seal part 3 and the contents 15, and the folded part 11 was opened. Almost at the same time as the unsealed part 9 of the package body was peeled off, air entered the vacuum tight package 50. Then, at the point 10 where the films of the front material 1 and the backing material 2 come into close contact, the films of the front material 1 and the backing material 2 are released and separated, and the vacuum tight package 50 is opened and the contents 15 are exposed. Therefore, it was easy to take out the contents 15.

As described above, in Examples 1 and 2, air can be easily admitted into the vacuum tight package 50, and the contents 15 can be easily opened and taken out, and as a result, 10 out of 10 people I felt that it was easy to take out the contents 15.

On the other hand, in Comparative Example 1, at a location 10 where the film of the front material 1 and the backing material 2 are in close contact between the scheduled opening part 18 and the contents 15, the film of the front material 1 and the backing material 2 that are in close contact with each other is strongly shifted with a finger, and vacuum is applied. Although air was introduced into the tight-fitting package 50, it took time to release the close contact between the front material 1 and the backing material 2, and as a result, at least one person out of 10 found it difficult to take out the contents 15. Ta.

In addition, in Comparative Example 2, the distance from the knob 19 that is the opening start part to the contents 15 is long, and the top material 1 and the backing material 2 are peeled off to the position of the contents 15 and placed in the vacuum tight package 50. It took time to introduce air and release the close contact between the front material 1 and the backing material 2, and as a result, at least one out of ten people found it difficult to take out the contents 15.

1...Front material 1a...Upper film 1b forming the front material...Lower film 2 forming the surface material...Backing material 3...Top seal portion 4, 4...Side seal Part 5... Bottom seal part 6... Top flange part 7, 7... Side flange part 8... Bottom flange part 9... Unsealed part of the package body 10... Backing material and front side The area where the contents-side surfaces of the two films that make up each material come into close contact with each other (the area where the backing and facing films come into close contact)
11... Folded part 12... Unsealed part of the folded part 13... Top end of the folded part 14... Side end of the folded part 15... Contents 16... Laminated film 17.・・Unsealing area 18 ・Notch 19 ・Knob 20 ・Film extension 31 ・Base layer 32 ・Intermediate layer 33 ・Sealant layer 50 ・Vacuum adhesion packaging

Claims (2)

A vacuum tight package formed by sealing a front material and a backing material and containing contents,
A fold-in portion formed by two films constituting the front material or the back material is provided at a position including a part of the unsealed part where the front material and the back material are not sealed,
The folding part is
It is formed by folding two films having an easy-peel layer and constituting a front material or a backing material with the easy-peel layer side mountain-folded, and stacking them facing each other with the easy-peel layer inside. and
Vacuum sealing, characterized by having an unsealed part provided in an area other than both ends of the top end of the folded part and not in contact with an edge other than the top end of the folded part. packaging. 2. The vacuum tight package according to claim 1, wherein the fold-in portion is provided at a position in contact with a part of the contents.

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