JP2008018946A - Deep drawn package - Google Patents

Abstract

Disclosed is a deep-drawn package having a novel form which is excellent in rigid properties such as pinhole resistance and can be made into a compact packaging form.
A deep drawing package comprising a bottom material having a plurality of deep drawing parts and a lid material heat-sealed to the bottom material, arbitrarily selected from a plurality of deep drawing parts A perforation cut or notch is formed in the bottom material and / or the lid material between two adjacent deep-drawn molded parts, and the two adjacent deep-drawn molded parts selected arbitrarily are the perforated cut or notched A deep-drawn package that can be folded so as to satisfy the predetermined condition (1) with the crease and the lid inside.
[Selection] Figure 1

Description

  The present invention relates to a deep-drawn package that has a plurality of deep-drawn molded parts capable of separately containing foods and the like and can be folded between the plurality of deep-drawn molded parts.

In recent years, amorphous polyester (hereinafter sometimes abbreviated as “APET”) or polypropylene (hereinafter sometimes abbreviated as “PP”) is used as the base material of the base film, and the contents are replaced with nitrogen or the like. Deep drawn packages (hereinafter sometimes referred to as “gas pack packaging”) are widely distributed (Patent Document 1). Among these gas pack packages, there are ones in which the molded part is divided into two parts so that they can be used little by little, and those that contain different parts (for example, hamburger and meat sauce, sliced ham and dressing). In addition, there is one in which a perforation cut or the like is inserted in a heat seal part between molding parts so that it can be separated into two (Patent Document 2).
Japanese Patent No. 3488764 JP 2002-59971 A

  However, both of the deep-drawn packages described in Patent Document 1 and Patent Document 2 have a form in which the lid material is exposed to the outside. Since such a cover material is usually a thin film of about 70 to 100 μm, there is a risk of pinholes occurring when a sharp object comes into contact with the cover material portion.

  Moreover, the package which divided | segmented the shaping | molding part described in patent document 2 into two had the tendency to become large planarly, and there existed a problem of taking a big place for storage and transportation.

  Therefore, an object of the present invention is to provide a deep-drawn package having a novel form that is excellent in rigid properties such as pinhole resistance and can be made into a compact packaging form.

  The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated embodiment.

1st this invention is a deep drawing package provided with the bottom material (20) which has a some deep drawing molding part (22a, 22b, ...), and the cover material (10) heat-sealed by the bottom material. In addition, perforations or cuts (30a,...) Are formed in the bottom material and / or the cover material between two adjacent deep drawing molded parts arbitrarily selected from a plurality of deep drawing molded parts. Two deep-drawn molded parts selected adjacent to each other can be folded so as to satisfy the following condition (1) with the perforation cut or incision as the crease and the lid (10) inside. (100A, ...).
Condition (1): Two adjacent deep-drawn parts (22a, 22b,...) Are folded at 180 ° and pressed at 15 N ° C. for 10 seconds at 10 N / cm, and then adjacent to each other. G (mm) is the maximum gap generated between the cover materials (10) of the two deep-drawn parts, and L (mm) is the maximum length from the fold (30a,...) To the front end in the folding direction of the deep-drawn part. ), G / L <0.05.

  In the first aspect of the present invention, the perforation cut or incision (30a,...) Has a ratio of the connection portion to the cut portion of 1: 1 to 5, and a connection portion of 0.5 mm to 2.0 mm is formed. It is preferable that the perforation is cut or the remaining thickness is 30 μm or more and 100 μm or less.

  In the first aspect of the present invention, it is preferable that the plurality of deep drawing portions (22a, 22b,...) Have different internal volumes and / or shapes.

  In the first aspect of the present invention, the lid member (10) preferably has a stretched film as an outer layer, so that two adjacent deep-drawn molded bodies can be separated from the fold line (30a, ...). be able to. Here, the “outer layer” refers to a surface layer on the side opposite to the side in contact with another film to be heat sealed.

  In the first aspect of the present invention, the bottom material (20) preferably has, as an outer layer, a stretched film having a printed layer formed on the laminate surface.

  In the first aspect of the present invention, the bottom material (20) preferably has an amorphous polyester base material having a size of 150 μm or more and 500 μm or less.

  In the first aspect of the present invention, the bottom material (20) or the cover material (10) is an inner layer or a layer adjacent to the inner layer, and has an easy peel strength of 1.96 N / 15 mm width to 14.7 N / 15 mm width at 25 ° C. It is preferable to have an easy peel layer. Here, the “inner layer” means a surface layer on the side in contact with another film to be heat sealed.

  The deep-drawn package of the present invention is folded so as to satisfy a predetermined condition with an inner side of a lid material between arbitrary molded parts among a plurality of deep-drawn molded parts. As a result, the deep-drawn molded article of the present invention has a form in which the cover material is on the inside and the bottom material having a relatively thick film is on the outside, so that the pinhole resistance and the rigid property are excellent. Can be. Moreover, it can be set as the deep drawn package of a compact size by folding.

Hereinafter, the deep-drawn package of the present invention will be described in more detail.
<Form of deep-drawn package of the present invention>
FIG. 1 (a) shows a perspective view of the deep-drawn package 100A before folding as an embodiment of the deep-drawn package of the present invention. FIG. 1B is a perspective view of the deep drawn package 100A of the present invention after folding. The deep-drawn molded body 100A of the present invention includes a bottom member 20 having two deep-drawn molded portions 22a and 22b, and a lid member 10 heat-sealed to the bottom member 20. And it has the part by which the cover material 10 and the bottom material 20 were heat-sealed between two deep drawing forming parts, and the perforation cut or notch 30a is formed in the bottom material 20 and / or the cover material 10 here. (In FIG. 1A, the perforation cut is indicated by a broken line).

  As shown in FIG. 1B, the deep-drawn package 100A of the present invention has a perforated cut or cut 30a as a crease, the lid 10 is on the inside, and predetermined conditions (1 ) Is folded to satisfy. In the deep-drawn package 100A shown in FIG. 1, the two deep-drawn molded portions 22a and 22b are substantially the same deep-drawn containers having a rectangular shape in plan view.

  Here, in the condition (1), “maximum length (L) from the crease to the front end in the folding direction of the deep drawing portion” will be described with reference to FIG. Means the longer of La and Lb. Note that “La” refers to the vertical line Y and the fold line 30a when a vertical line Y with respect to the fold line 30a (shown by a one-dot chain line in FIG. 1A) is drawn on the lid member 10. The distance between the intersection Y1 and the intersection Y2 between the vertical line Y and the front end of the deep drawing portion 22a in the folding direction. Further, “Lb” refers to the distance between the intersection Y1 and the intersection Y3 between the vertical line Y and the front end of the deep drawing portion 22b in the folding direction. Further, since the deep-drawn package 100A is symmetrical in plan view at the fold line 30a, La and Lb are substantially the same. Note that “substantially the same” does not require strict identicalness, and 90% or more, preferably 95% or more of the inner lid member 10 in the folded form of FIG. It means the identity to the extent that it may be covered with 20 (hereinafter the same applies in this specification).

  As shown in FIG. 1B, the packaging body of the present invention is folded with the lid 10 facing inward so that the base material 20 having a relatively thick film is on the outside. be able to. Thereby, the deep drawn package 100A of the present invention is excellent in pinhole resistance and rigid property, and can be a deep drawn package having a compact size.

  In addition, as shown in FIG. 1A, it is preferable to provide a non-heat seal portion 12 that triggers opening when the bottom material 20 or the lid material 10 is provided with an easy peel property. By grasping the lid material film 10 of the non-heat seal portion 12, the lid material 10 can be easily peeled from the bottom material 20. Further, various ribs may be formed on the deep drawing portions 22 a and 22 b of the bottom material 20. Thereby, the bottom material 20 can be made more excellent in the rigid property.

  The figure explaining the folding mechanism of 100 A of deep drawing package bodies of this invention was shown to Fig.2 (a)-(d). Each figure is a front view as seen from the direction of arrow X in FIG. The form in FIG. 1A corresponds to FIG. 2A, and the form in FIG. 1B corresponds to FIG. In this way, the two adjacent deep drawing portions 22a and 22b are folded with the perforation cut or cut 30a as a crease and the lid 10 facing inward. As shown in FIG. 2 (c), the bottom member 20 is folded with the lid member 10 as the inner side to form a so-called shell, resulting in a deep-drawn package having excellent rigid properties.

  3 and 4 show other forms 100B and 100C of the deep drawn package of the present invention. The form 100B shown in FIG. 3 includes a bottom member 20 having four deep-drawn molded portions 22c, 22d, 22e, and 22f, and a lid member 10 heat-sealed to the bottom member 20. And perforated cuts 30b and 30c are formed in the heat seal part between the deep drawing parts 22c and 22d and between the deep drawing parts 22e and 22f. The deep drawing portions 22c and 22f are folded by satisfying the condition (1) described below with the perforated cuts 30b and 30c as folds and the lid 10 as the inner side, so that FIG. It can be set as shown in FIG.

  In the deep-drawn package 100B shown in FIG. 3, the deep-drawn molded portions 22c and 22d are substantially the same deep-drawn containers having a rectangular shape in plan view. Further, the deep drawing portions 22e and 22f are substantially the same deep drawing container having a rectangular shape in plan view.

  The deep-drawn package 100B shown in FIG. 3 is so-called configured to include a central portion composed of deep-drawn molded portions 22d and 22e and door portions composed of deep-drawn molded portions 22c and 22f located on both sides thereof. This is a double door package. In such a double-spread type package, the “maximum length (L) from the fold to the front end in the folding direction of the deep-drawn molded part” in the condition (1) is the deep-draw from the fold in the door portions 22c and 22f. The maximum length (L) up to the front end in the folding direction of the molded part. That is, in the embodiment shown in FIG. 3, the maximum length (L) is the longer of Lc and Lf.

  Further, in the deep-drawn package 100B, the total length Lc + Lf of Lc and Lf is substantially the same as the length Lde in the lateral direction in plan view of the central portion formed of the deep-drawn molded portions 22d and 22e. Then, as shown in FIG. 3 (b), when folded with the folds 30b and 30c, the bottom material 20 covers the lid material 10 to form a deep-drawn packaging body having a compact size with excellent rigidity. be able to.

  The form 100C shown in FIG. 4 includes a bottom member 20 having three deep-drawn portions 22g, 22h, and 22j, and a lid member 10 heat-sealed to the bottom member 20. Further, perforation cuts 30d and 30e are formed in the heat seal portion between the deep drawing portions 22g and 22h and between the deep drawing portions 22h and 22j. By forming these perforated cuts 30d and 30e as folds, with the lid 10 facing inward, and deep drawing portions 22g and 22j are folded, a configuration as shown in FIG. 4B can be obtained.

  Further, since the deep-drawn package 100C shown in FIG. 4 is a double spread type package similar to the package shown in FIG. 3, the maximum length (L) in the condition (1) is the door portion 22g. , 22j to the maximum length (L) from the fold line to the front end in the folding direction of the deep drawing part. That is, in the deep-drawn package 100C shown in FIG. 4, the maximum length (L) refers to the longer of Lg and Lj.

  Further, in the deep-drawn package 100C, the total length Lg + Lj of Lg and Lj is substantially the same as the length Lh in the lateral direction in plan view of the central portion formed of the deep-drawn molded portion 22h. Then, as shown in FIG. 4 (b), when folded with 30d and 30e as folds, the bottom material 20 covers the lid material 10 to form a deep drawn package having a compact size with excellent rigidity. be able to.

  A deep-drawn package 100C shown in FIG. 4 is a deep-drawn package in which the internal capacity and shape of the deep-drawn molded parts 22g and 22j are different from the internal capacity and shape of the deep-drawn molded part 22h. An example of actual use of the deep-drawn package 100C includes pasta noodles in the deep-drawn molded part 22h, tomato-based pasta sauce in the deep-drawn molded part 22g, and cream-based in the deep-drawn molded part 22j. By adding the pasta sauce, it is possible to provide a package that can provide pasta that can taste two kinds of sauces. It is also possible to put a salad in the deep drawing part 22h, put a Caesar dressing in the deep drawing part 22g, and put a Japanese dressing in the deep drawing part 22j. Thus, it can be set as the package which can respond flexibly to the diversification of a consumer's taste in recent years.

  So far, in FIGS. 1 to 4, the deep drawn packages 100 </ b> A, 100 </ b> B, and 100 </ b> C having the deep drawn portions 22 a to 22 j that are rectangular in plan view have been described. However, the shape of the deep drawing portion is not limited to a rectangular shape in plan view. For example, a so-called scallop-shaped deep-drawn package 100D having deep-drawn molded portions 22k and 22m having a shape as shown in FIG. The deep drawn package 100D includes a bottom member 20 having two deep drawn portions 22k and 22m, and a lid member 10 heat-sealed to the bottom member 20. A perforated cut 30f is formed in the heat seal portion between the deep drawing portions 22k and 22m. By folding the perforated cut 30f as the fold and the lid member 10 as the inner side, a form as shown in FIG. 5B can be obtained.

  The deep-drawn package 100D having the form shown in FIG. 5 is viewed in a plan view on a vertical bisector Y of the perforated cut 30f on the lid 10 (indicated by a one-dot chain line in FIG. 5A). It is symmetrical. Therefore, in the portion of the vertical bisector Y, the deep-drawn package 100D has the largest lateral length. Therefore, the maximum length (L) in condition (1) refers to the longer of Lk and Lm in the figure. Note that “Lk” is between the intersection Y4 of the vertical bisector Y and the perforated cut 30f and the intersection Y5 of the vertical bisector Y and the front end of the deep drawing portion 22k in the folding direction. Distance. “Lm” is a distance between the intersection Y4 and the intersection Y6 between the vertical bisector Y and the front end of the deep drawing portion 22m in the folding direction. In the deep-drawn package 100D, Lk and Lm are substantially the same because the fold line 30f is symmetrical in plan view.

  The deep-drawn packaging bodies 100A to 100D shown above are only one embodiment of the deep-drawn molded body of the present invention. In the deep-drawn packaging body of the present invention, two adjacent deep-drawn molded parts that are arbitrarily selected satisfy the condition (1) described below with the perforation cut or notch as the crease and the lid material inside. As long as it is folded, the shape and internal volume of the deep-drawn molded part are not limited to those of the above-described embodiment. Moreover, the deep drawing molded part which a deep drawing package has may have a different internal volume and / or shape.

<Perforated cut, cut (30a, ...)>
In the deep drawn package 100 of the present invention, a perforation cut or notch (30a) is formed in the bottom material 20 and / or the lid 10 between two adjacent deep drawn molded parts arbitrarily selected from a plurality of deep drawn molded parts. ... Are formed. The perforation cut or notch (30a,...) Becomes a fold when the deep-drawn package 100 is folded.

  In the perforation cut (30a,...), A plurality of cut portions penetrating the bottom member 20 and the lid member 10 are formed in a straight line between two adjacent deep drawing portions. As a result, the connection portions and the cut portions are alternately formed in the fold lines (30a,...). The lower limit of the length of the connecting part is preferably 0.5 mm or more, preferably 0.7 mm or more, more preferably 0.9 mm or more, and the upper limit is preferably 2.0 mm or less, preferably 1.5 mm or less, More preferably, it is 1.2 mm or less. The lower limit of the length of the cut part is preferably 0.5 mm or more, preferably 1.0 mm or more, more preferably 1.5 mm or more, and the upper limit is preferably 10.0 mm or less, preferably 6.0 mm. Hereinafter, it is more preferably 4.0 mm or less.

  Thus, by making the connection part 0.5 mm or more and 2.0 mm or less, it is possible to prevent the deep-drawn package from breaking at the perforated cut part due to impacts such as transportation. Moreover, favorable foldability and separability can be obtained by making a cutting part into 0.5 mm or more and 10.0 mm or less. Moreover, it is desirable that the ratio of the connecting portion to the cutting portion is 1: 1 to 5, preferably 1: 1 to 4, and more preferably 1: 1 to 3. By adjusting the ratio of the connecting portion and the cutting portion within this range, it is possible to obtain a deep-drawn container that has good foldability and does not break during transportation.

  The notch 30 (30a,...) Is a predetermined depth formed from the lid 10 side or the bottom material 20 side in a portion 30 (30a,...) That becomes a crease between two adjacent deep drawing portions. This is the cut part. The remaining thickness refers to the thickness obtained by removing the predetermined depth of the cut portion from the total thickness of the bottom member 20 and the lid member 10.

  When the cuts 30 (30a,...) Are formed, the lower limit of the remaining thickness of the lid and bottom material is 30 μm or more, preferably 40 μm or more, more preferably 50 μm or more, and the upper limit is 100 μm or less, preferably 80 μm or less, more preferably 70 μm or less. By making the remaining thickness 30 μm or more, it is possible to prevent the deep-drawn package from being broken at the cut portion due to an impact such as transportation. Moreover, favorable folding property and separability can be obtained by making the remaining thickness 100 μm or less.

  The package of the present invention can be separated by hand and can withstand impacts such as transportation. That is, the package 100A of FIG. 1 can be manually separated from the perforated cut or cut portion 30a into a package having a deep drawing part 22a and a package having a deep drawing part 22b. It is possible to withstand impacts such as transportation.

  The adjustment of the force required for separation can be adjusted by the length of the perforation and the depth of the cut. As described above, the length of the separable perforated connecting portion is in the range of 0.5 to 2.0 mm, and the length of the cut portion is 0.5 to 10.0 mm as described above. The ratio of the part to the cut part is 1: 1 to 5 as described above, and the remaining thickness of the cut part is 30 to 100 μm as described above. If the deep-drawn packaging container can be separated as in the present invention, it can be consumed for each packaging container, and convenience is improved.

<Condition (1)>
In the deep-drawn package of the present invention, two adjacent deep-drawn molded parts that are arbitrarily selected satisfy the following condition (1) with the above-mentioned perforation cut or notch as the fold and the lid material inside. It is folded like this.

  Condition (1): After pressing a crease formed by folding two adjacent deep-drawn parts 180 ° at 10 N / cm at 15 ° C. for 10 seconds, the two adjacent deep-drawn parts G / L <0.05, where G (mm) is the maximum gap generated between the lid members, and L (mm) is the maximum length from the fold line to the front end of the deep drawing portion in the folding direction. Preferably it is 0.04, More preferably, it is 0.03.

  In condition (1), G and L are measured after a predetermined pressure is applied over the entire length of the fold. This is a necessary treatment because the film is not elastic enough to return to the state before the film was folded at the crease part by simply folding the deep-drawn package at the crease, and it is not a desired fold shape. This process is also performed in a deep drawn package that is an actual product.

  FIG. 6 shows a side view of a folded form obtained by performing the above-described pressing on the deep-drawn package 100A of FIG. Hereinafter, the condition (1) will be described with reference to FIG. As already described above, the maximum length (L) in the deep-drawn package 100A is La (or Lb). Further, in FIG. 6, when the deep-drawn package 100A is folded, gaps generated between the cover members of the two adjacent deep-drawn molded portions 22a and 22b are shown as G1, G2, and G3. Among these, the maximum gap G in the condition (1) is G1. Therefore, the condition (1) in the form of FIG. 6 is “G1 / La <0.05”.

  The deep drawn package of the present invention comprises a bottom material film and a lid material film. The bottom material film and the lid material film are a single layer or a multilayer film.

<Bottom material film>
The bottom material film used in the deep drawn package of the present invention is composed of an inner layer, an intermediate layer, and an outer layer. The inner layer of the bottom film used in the deep-drawn package of the present invention comprises a heat seal layer and / or an easy peel layer. When the inner layer is composed of a heat seal layer and an easy peel layer, the heat seal layer is disposed on the first inner layer (innermost side), the easy peel layer is adjacent to the intermediate layer side of the inner layer (adjacent layer), the second layer It is desirable to arrange in the inner layer. The intermediate layer of the bottom film used in the deep-drawn package of the present invention includes a polyamide layer (hereinafter referred to as PA layer), an ethylene-vinyl acetate copolymer saponified layer (hereinafter referred to as EVOH layer), and an ethylene-vinyl acetate layer (EVA layer). ), A polyethylene layer (PE layer), an adhesive resin layer, a plurality of layers, or all layers. Moreover, in the layer which comprises the above-mentioned intermediate | middle layer, there may be two or more layers of the same kind. When there are a plurality of layers constituting the intermediate layer, the stacking order of the layers constituting the intermediate layer is not particularly defined, but the EVA layer and the PE layer are inner layers from the viewpoint of imparting flexibility to the film of the present invention. It is desirable to arrange it between the PA layer. The outer layer of the bottom material film used for the deep-drawn package of the present invention is a layer having a bottom material base material layer. Furthermore, the bottom material printing layer and / or the bottom material outer layer may be arranged outside the bottom material substrate layer. When two layers of the bottom material printing layer and the bottom material outer layer are arranged, the bottom material substrate layer It is preferable to dispose the bottom material printing layer on the outside and further dispose the bottom material outer layer on the outside.
Below, each layer is explained in full detail.

(Inner layer: heat seal layer)
PE and PP resins may be used for the inner layer of the bottom material film 20 and the lid material film 10 used in the package of the present invention for the purpose of imparting heat sealability. Here, if the inner layer is the bottom material film 20, it means the surface layer on the side that comes into contact with the lid material film 10 when heat-sealed with the lid material film 10. When heat-sealed with the film 20, it refers to the surface layer on the side that contacts the bottom material film 20 side.

  As resin used for the heat seal layer, linear low density polyethylene (LLDPE), low density polyethylene (LDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), Ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-methyl acrylate copolymer (EMA), ethylene-acrylic Examples thereof include a resin composition and polypropylene (PP) which are at least one selected from the group consisting of an ionomer of an acid copolymer (EAA) and an ionomer of an ethylene-methacrylic acid copolymer (EMAA). Of these, linear low density polyethylene (LLDPE), low density polyethylene (LDPE) or a mixture thereof is preferably used, and in particular, linear low density polyethylene (LLDPE) is preferably used as a heat seal temperature, It is preferable in terms of seal strength.

  The lower limit of the thickness of the heat seal layer is 2 μm or more, preferably 3 μm or more, more preferably 4 μm or more, and the upper limit is 50 μm or less, preferably 45 μm or less, more preferably 40 μm or less.

(Inner layer: Easy peel layer)
An easy peel property can be imparted to the inner layer of the bottom material film 20 and the lid material film 10 used in the package of the present invention in order to improve the openability. Easy peel properties may be imparted to either the bottom material film 20 or the lid material film 10, and may be any of a cohesive failure type, an interlayer peeling type, or an interface peeling type. The easy peel strength is 25 ° C. from the viewpoint of the balance between easy opening and sealing properties, and the lower limit thereof is preferably 1.96 N / 15 mm width or more, more preferably 2.45 N / 15 mm width or more, and further preferably 2.94 N. The upper limit is preferably 14.7 N / 15 mm width or less, more preferably 9.8 N / 15 mm width or less, and even more preferably 7.84 N / 15 mm width or less. By setting the lower limit of the easy peel strength to 1.96 N / 15 mm width or more, bag breakage during transportation can be prevented, and by setting the upper limit to 14.7 N / 15 mm width or less, good opening Sex is obtained. The easy peel strength is obtained by cutting a heat-sealed portion of a deep-drawn package comprising a bottom material film 20 and a lid material film 10 into a strip shape having a width of 15 mm and using a tensile tester at a speed of 200 mm / min. It calculated | required from the maximum load when the bottom material film 20 was peeled.

  In the case of the cohesive failure type, the thickness of the easy peel layer is 2 μm or more, preferably 3 μm or more, more preferably 4 μm or more, and the upper limit is 30 μm or less, preferably 25 μm or less, more preferably 20 μm or less. The thickness of the easy peel layer in the case of delamination type and interface peeling type is 3 μm or more, preferably 4 μm or more, more preferably 5 μm or more, and the upper limit is 50 μm or less, preferably 40 μm or less, more preferably Is 35 μm or less.

(Intermediate layer: PA layer)
A polyamide layer (hereinafter referred to as PA) may be provided on the bottom layer film and / or the intermediate layer of the lid material film of the present invention for the purpose of imparting pinhole resistance. PA is not particularly limited, but nylon-based resin (Ny) is preferably used from the viewpoint of pinhole resistance. Examples of Ny include polymers of condensed units such as 6 nylon, 66 nylon, 69 nylon, 6-66 nylon, 12 nylon, 11 nylon, 610 nylon, 612 nylon, 6I-6T nylon, and MXD6 nylon, or two of these. Copolymers with the above, and mixtures thereof can also be mentioned. Among them, it is preferable to use 6 nylon or 6-66 nylon.

  When a PA layer is provided as an intermediate layer, the lower limit of the thickness of the PA layer is 2 μm or more, preferably 3 μm or more, more preferably 5 μm or more, and the upper limit is 30 μm or less, preferably 20 μm or less, more preferably 15 μm. It is as follows. When the lower limit value of the thickness of the PA layer is 2 μm or more, good pinhole resistance is obtained, and when the upper limit value is 30 μm or less, good cut property in a deep-drawing packaging machine is obtained.

(Intermediate layer: EVOH layer)
An ethylene-vinyl acetate copolymer saponified layer (hereinafter referred to as EVOH) can be provided in the intermediate layer of the bottom film and / or the lid film of the package of the present invention for the purpose of imparting oxygen barrier properties. The ethylene content of EVOH used in the EVOH layer is not particularly limited, but is preferably 29 to 47 mol%, more preferably 32 to 44 mol% from the viewpoint of film formation stability. The saponification degree of EVOH is preferably 90% or more, more preferably 95 mol% or more. By maintaining the ethylene content and saponification degree of EVOH within the above ranges, the coextrudability and strength of the film of the present invention can be improved.

  When an EVOH layer is provided, the lower limit of the thickness of the EVOH layer is 5 μm or more, preferably 8 μm or more, more preferably 10 μm or more, and the upper limit is 30 μm or less, more preferably 25 μm or less, and even more preferably 20 μm or less. By setting the lower limit of the EVOH layer thickness to 5 μm or more, sufficient oxygen barrier properties are obtained, and by setting the upper limit to 30 μm or less, the coextrudability of the film is not deteriorated and good film strength is maintained. it can.

(Intermediate layer: EVA layer)
The ethylene content of EVA used in the EVA layer is not particularly limited, but from the viewpoint of film formation stability, the lower limit is preferably 1 mol% or more, more preferably 1.5 mol% or more. The upper limit is preferably 20 mol% or less, more preferably 15 mol% or less. From the viewpoint of film formability, the lower limit of the thickness of the EVA layer is preferably 5 μm or more, preferably 10 μm or more, more preferably 15 μm or more, and the upper limit is preferably 100 μm or less, more preferably 80 μm or less, still more preferably. 60 μm or less.

(Intermediate layer: PE layer)
The PE used in the PE layer is not particularly limited. For example, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), or a mixture thereof may be used. it can.

  LDPE or LLDPE having a density of 0.90 or more is preferable, and HDPE having a density of 0.94 or more is preferably used. By using a high-density material, moderate hardness can be imparted to the PE layer while maintaining flexibility. When the PE layer is provided, the lower limit of the thickness of the PE layer is preferably 5 μm or more, more preferably 10 μm or more, further preferably 15 μm or more, and the upper limit is preferably 100 μm or less, more preferably 80 μm or less, and even more preferably 60 μm. It is as follows.

(Intermediate layer: Adhesive resin layer)
As an intermediate layer of the bottom material film and / or the lid material film of the packaging body of the present invention, an adhesive resin layer can be disposed to adhere each layer. The adhesive resin used in the adhesive resin layer is not particularly limited as long as it can adhere the PA layer, PE layer, APET layer, etc. to the required strength, but a polyolefin resin modified with an unsaturated carboxylic acid or a derivative thereof is used. It can be used suitably. Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, maleic acid, fumaric acid, crotonic acid, itaconic acid, citraconic acid and the like. In addition, esters and anhydrides of the unsaturated carboxylic acid can be used as the adhesive resin, and as derivatives, methyl acrylate, methyl methacrylate, ethyl acrylate, propyl acrylate, butyl acrylate, butyl methacrylate, glycidyl acrylate In addition to glycidyl methacrylate, acrylamide, methacrylamide, sodium acrylate, etc., vinyl acetate can be used. As commercially available adhesive resin, the Mitsui Chemicals make and brand name Admer can be mentioned, for example.

  The thickness of the adhesive resin layer is not particularly limited as long as each layer can be bonded with a necessary adhesive strength, but the lower limit is preferably 2 μm or more, more preferably 3 μm or more, further preferably 5 μm or more, and the upper limit is preferably 20 μm or less. Preferably it is 15 micrometers or less, More preferably, it is 10 micrometers or less.

(Outer layer: Base material base)
The bottom material 20 of the deep drawn package of the present invention preferably has an amorphous polyester base material having a predetermined thickness. The lower limit of the thickness of the amorphous polyester substrate is preferably 150 μm or more, more preferably 180 μm or more, still more preferably 200 μm or more, and the upper limit is preferably 500 μm or less, more preferably 450 μm or less, and even more preferably 400 μm or less. It is. By setting the lower limit of the thickness of the bottom base material to 150 μm or more, the waist (rigidity) as a package can be maintained, and by setting the upper limit to 500 μm or less, good folding suitability can be obtained.

(Outer layer: Bottom material base layer)
In the bottom material 20 of the deep-drawn package of the present invention, an outer layer can be provided on the outside of the bottom material base. As the resin constituting the bottom base material outer layer, it is preferable to use an amorphous polyester-based resin in order to impart gloss.

  For example, a polyethylene terephthalate glycol resin (PETG) in which the diol component is composed of 1,4-cyclohexanedimethyl alcohol and ethylene glycol and the dicarboxylic acid component is composed of terephthalic acid can be suitably used as the amorphous polyester resin of the present invention.

(Outer layer: bottom printing layer)
In the bottom material 20, a printed biaxially stretched polyester film or unstretched polypropylene film (hereinafter, CPP) may be laminated on the outside of the base material by a method such as dry lamination.

<Cover material film>
The lid material film used for the deep-drawn package of the present invention is composed of an inner layer, an intermediate layer, and an outer layer. The inner layer and the intermediate layer of the lid film used in the deep drawn package of the present invention preferably have the same mode as the bottom film used in the deep drawn package of the present invention. The outer layer of the lid material film used in the deep-drawn package of the present invention is a layer composed of the lid material outer layer.

  The lid of the package of the present invention preferably has a stretched film as the lid outer layer. As the stretched film, a biaxially stretched polyethylene terephthalate film (OPET), a biaxially stretched polypropylene film (OPP), or a biaxially stretched polyamide film (ONy) can be used. can do. Thus, by providing a stretched film as the lid outer layer, it is possible to impart hardness to the lid or to perform printing.

<Layer structure of lid or bottom film>
The laminated film of the lid | cover material or bottom material used for the deep drawing package of this invention is illustrated. The symbols used in the examples are as follows. Polyamide resin layer (A), EVOH layer (B), PETG layer (C), polyethylene resin layer (D), APET layer (E), polypropylene resin layer (F), adhesive resin layer (G), heat seal layer and An easy peel layer (H) and a printed stretched film layer (I). Among these, a preferable layer configuration is the following (4) or (5), and a more preferable layer configuration is (4).
(1) E / G / H
(2) E / G / B / G / H
(3) E / G / B / A / G / H
(4) E / G / A / B / A / G / H
(5) C / E / G / A / B / A / G / H
(6) I / E / G / A / B / A / G / H
(7) I / C / E / G / A / B / A / G / H
(8) E / G / A / B / A / G / D / H
(9) E / G / D / G / A / B / A / G / H
(10) E / G / D / G / A / B / A / G / D / H

<Manufacturing method of package>
A non-stretched composite film is produced by coextrusion of a part of the bottom material and the lid material film used in the present invention. Thereafter, if necessary, another layer may be provided by a lamination method. The film obtained by the lamination method may be a single layer or a plurality of layers, and may be an unstretched film or a stretched film. When the obtained film is used as a bottom material, a container is formed as a deep drawn package by a deep drawing machine. When the bottom material film and the lid material film are sealed, they are fused by heat fusion. A perforation cut can be made by making the cutting blade of a deep drawing packaging machine into a saw blade shape. The connection part and the cutting part of the perforation cut can be adjusted by changing the interval of the saw blade.

  Examples of the present invention will be described below, but the present invention is not limited thereto.

(Example 1)
A bottom material film having the following layer structure was prepared by coextrusion of all layers.
(Bottom material film)
APET (250 μm) / adhesive resin (10 μm) / EVOH (10 μm) / Ny (10 μm) / adhesive resin (10 μm) / LDPE (20 μm)
“/” Between layers means that they are laminated by coextrusion (the same applies hereinafter).
Also, a biaxially stretched polyester film was dry laminated on the outer layer of the coextruded film having the following layer structure to produce a lid material film having the following structure.
(Cover material film)
OPET (12 μm) // EVOH (10 μm) / Ny (10 μm) / adhesive resin (10 μm) / easy peel layer (PP: 25 μm) / heat seal layer (LLDPE: 5 μm)
“//” between the layers means that they are laminated by dry lamination (the same applies hereinafter).
These bottom material films and lid material films were used for deep drawing packaging. Deep-drawing packaging is carried out by a deep-drawing packaging machine (multi-pack R530). The bottom film is formed into a deep drawing molded part A having a shape of 144 mm in length, 106 mm in width and 25 mm in drawing depth, 144 mm in length, 106 mm in width, and drawing depth. Deep draw molding into a shape with two molding parts of 15mm deep drawing part A ', slice ham 100g in deep drawing molding part A, slice ham 60g in deep drawing molding part A', cover material The film was covered and replaced with nitrogen, followed by frame sealing.
Then, the perforation cut shown below was put, it folded in half, and the deep drawing package was produced.
(Perforated cut)
Connection part: 0.8 mm Cutting part: 1.5 mm

(Example 2)
Using the same bottom material film and lid material film as in Example 1, deep drawing packaging was performed in the same manner as in Example 1, and the following cuts were made from the lid material side to produce a deep drawing package.
(Cut)
Remaining thickness: 50 μm

(Example 3)
A bottom material film having the following layer structure was produced. Using this bottom material film and the same lid material film as in Example 1, deep-drawn packaging was performed in the same manner as in Example 1, and perforated cuts shown below were put into a deep-drawn package.
(Bottom material film)
Biaxially stretched polyester film for molding (16 μm) / APET (200 μm) / adhesive resin (10 μm) / EVOH (10 μm) / Ny (10 μm) / adhesive resin (10 μm) / LDPE (20 μm), biaxial for molding Printing is performed on the laminate surface side of the stretched polyester film.
(Perforated cut)
Connection part: 0.8 mm Cutting part: 1.5 mm

Example 4
A bottom material film having the following layer structure was produced by coextrusion of all layers.
(Bottom material film)
PETG (20 μm) / APET (250 μm) / Adhesive resin (10 μm) / EVOH (10 μm) / Ny (10 μm) / Adhesive resin (10 μm) / LDPE (20 μm)
Using the above bottom material film and the same lid material film as in Example 1, deep-drawn in the same manner as in Example 1, cut into the perforations shown below, and folded in half to produce a deep-drawn package. did.
(Perforated cut)
Connection part: 0.8 mm Cutting part: 1.5 mm

(Example 5)
Using the same base material film and lid material film as in Example 1, deep-drawn packaging was performed in the same manner as in Example 1, and the following perforation cuts were made and folded in half to produce a deep-drawn package. .
(Perforated cut)
Connection part: 2.0 mm Cutting part: 2.0 mm

(Example 6)
Using the same base material film and lid material film as in Example 1, deep-drawn packaging was performed in the same manner as in Example 1, and the following perforation cuts were made and folded in half to produce a deep-drawn package. .
(Perforated cut)
Connection part: 1.5 mm Cutting part: 4.5 mm

(Example 7)
Using the same base material film and lid material film as in Example 1, deep-drawn packaging was performed in the same manner as in Example 1, and the following perforation cuts were made and folded in half to produce a deep-drawn package. .
(Perforated cut)
Connection part: 1.0 mm Cutting part: 4.0 mm

(Example 8)
Using the same base material film and lid material film as in Example 1, deep-drawn packaging was performed in the same manner as in Example 1, and the following perforation cuts were made and folded in half to produce a deep-drawn package. .
(Perforated cut)
Connection part: 0.5 mm Cutting part: 2.5 mm

Example 9
Using the same bottom material film and lid material film as in Example 1, deep drawing packaging was performed in the same manner as in Example 1, and the following cuts were made from the lid material side to produce a deep drawing package.
(Incision)
Remaining thickness: 80 μm

(Example 10)
A bottom material film having the following layer structure was prepared by coextrusion of all layers.
(Bottom material film)
APET (450 μm) / Adhesive resin (10 μm) / EVOH (10 μm) / Ny (10 μm) / Adhesive resin (10 μm) / LDPE (20 μm)
Using the above bottom material film and the same lid material film as in Example 1, deep-drawn in the same manner as in Example 1, cut into the perforations shown below, and folded in half to produce a deep-drawn package. did.
(Perforated cut)
Connection part: 0.8 mm Cutting part: 1.5 mm

(Reference Example 1)
A bottom material film having the following layer structure was produced. Using this bottom material film and the same lid material film as in Example 1, deep-drawn packaging was performed in the same manner as in Example 1, and perforated cuts shown below were put into a deep-drawn package.
(Bottom material film)
APET (130 μm) / Adhesive resin (10 μm) / EVOH (10 μm) / Ny (10 μm) / Adhesive resin (10 μm) / LDPE (30 μm)
(Perforated cut)
Connection part: 1.0 mm Cutting part: 2.0 mm

(Comparative Example 1)
A bottom material film having the following layer structure was produced. Using this bottom material film and the same lid material film as in Example 1, deep-drawn packaging was performed in the same manner as in Example 1, and perforated cuts shown below were put into a deep-drawn package.
(Bottom material film)
APET (600 μm) / Adhesive resin (10 μm) / EVOH (10 μm) / Ny (10 μm) / Adhesive resin (10 μm) / LDPE (20 μm)
(Perforated cut)
Connection part: 1.0 mm Cutting part: 1.5 mm

(Reference Example 2)
Using the same bottom material film and lid material film as in Example 1, deep-drawn packaging was performed in the same manner as in Example 1, and perforated cuts shown below were put into a deep-drawn package.
(Perforated cut)
Connection part: 0.3 mm Cutting part: 2.0 mm

(Comparative Example 2)
Using the same bottom material film and lid material film as in Example 1, deep-drawn packaging was performed in the same manner as in Example 1, and perforated cuts shown below were put into a deep-drawn package.
(Perforated cut)
Connection part: 3.0 mm Cutting part: 2.0 mm

(Comparative Example 3)
Using the same bottom material film and lid material film as in Example 1, deep-drawn packaging was performed in the same manner as in Example 1, and perforated cuts shown below were put into a deep-drawn package.
(Perforated cut)
Connection part: 0.8 mm Cutting part: 0.5 mm

(Reference Example 3)
Using the same bottom material film and lid material film as in Example 1, deep-drawn packaging was performed in the same manner as in Example 1, and perforated cuts shown below were put into a deep-drawn package.
(Perforated cut)
Connection part: 0.8 mm Cutting part: 7.0 mm

(Reference Example 4)
Using the same bottom material film and lid material film as in Example 2, deep drawing packaging was performed in the same manner as in Example 1, and the following cuts were made from the lid material side to produce a deep drawing package.
(Incision)
Remaining thickness: 15 μm

(Comparative Example 4)
Using the same bottom material film and lid material film as in Example 2, deep drawing packaging was performed in the same manner as in Example 1, and the following cuts were made from the lid material side to produce a deep drawing package.
(Incision)
Remaining thickness: 150 μm

In the above Examples and Comparative Examples, the following were specifically used as the resin constituting each layer of the bottom material film and the lid material film.
APET: Mitsubishi Chemical Corporation, Novapex Ny: Mitsubishi Engineering Plastics, Novamid (6Ny)
Adhesive resin: Mitsui Chemicals, Admer LDPE: Nippon Polyethylene, Novatec LD
EVOH: manufactured by Kuraray Co., Ltd., Eval (44 mol type)
OPET: E5100 (Estimate Film, manufactured by Toyobo)
Easy peel layer PP: manufactured by Nippon Polypro, Novatec PP (Random Copolymer)
Heat seal layer LLDPE: manufactured by Nippon Polyethylene Co., Ltd., Novatec C6
As an easy peel type in this example, an easy peel of a delamination type was adopted. In this case, the easy strength was 7.85 N / 15 mm width.
Biaxially stretched polyester film (for dry lamination): F685 (Toray Industries, Lumirror)

<Evaluation method>
(Folding)
When the perforation was cut or folded along the incision, a G / L smaller than 0.05 was evaluated as “◯”, and a G / L larger than 0.05 was evaluated as “X”.

(Drop test)
Deep-drawn packages are stacked in 5 layers in a row (20 in total), packed in cardboard cases, stored at 5 ° C for more than 24 hours, and dropped from the bottom of the concrete surface 20 times from the height of 1 m. And dropped 10 times from the side. Thereafter, the deep-drawn package in the cardboard was checked to confirm the presence or absence of breakage from the folding part and the collapse of the package. “O” indicates that the package is not crushed and the package is not crushed, “X” indicates that one of the 20 ruptures is broken from the fold, or if the package is crushed As evaluated.

(Separability)
Those that could be separated by hand were designated as “◯”, and those that were difficult to separate were designated as “x”.

(durability)
From the folded state of the package (FIG. 1 (b)), it opens 270 ° along the perforation cuts or cuts, and then returns to the folded state (FIG. 1 (b)). This action was repeated 20 times, and the case where there was no break in the perforated cut or the cut portion was designated as “◯”, and the case where there was no break was designated as “x”.

  From Table 1, Examples 1 to 10 have good foldability, do not break from perforation cuts or cuts even in a drop test, can be separated by hand, and have excellent durability. A deep-drawn package was obtained.

  On the other hand, in Reference Example 1, since the APET thickness was thin, the package was crushed in the drop test. Further, Comparative Example 1 was not folded well because of the thick APET. Further, in Reference Example 2, the connection portion of the perforation cut was too short, and the ratio of the connection portion to the cut portion was 1: 6.7, so that the perforation was broken in the drop test. Moreover, since the connection part of the perforation cut was too long and the ratio of a connection part and a cutting part was 1: 0.7, the comparative example 2 was not folded well. Moreover, since the cut part of the perforation cut was too short and the ratio of a connection part and a cut part was 1: 0.6, the comparative example 3 was not folded well. In Reference Example 3, the cut portion of the perforation cut was too long, and the ratio of the connection portion to the cut portion was 1: 8.8, so that the perforation broke in the drop test. In Reference Example 4, since the remaining film thickness of the cut portion was thin, the cut portion was broken in the drop test. In Comparative Example 4, since the remaining film thickness of the cut portion was thick, it did not fold well and was difficult to separate by hand.

  While the present invention has been described in connection with embodiments that are presently the most practical and preferred, the present invention is not limited to the embodiments disclosed herein. However, the invention can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and a deeply drawn package with such a change is also included in the technical scope of the present invention. It must be understood as a thing.

It is the perspective view (FIG.1 (a)) before folding of the deep drawing package 100A of this invention (FIG.1 (a)), and the perspective view (FIG.1 (b)) after folding. It is a side view which shows the mechanism which folds the deep drawing package of this invention. It is the perspective view (FIG. 3 (a)) before folding of other form 100B of the deep drawing package of this invention, and the perspective view (FIG.3 (b)) after folding. It is the perspective view (FIG. 4 (a)) before folding of other form 100C of the deep drawing package of this invention, and the perspective view (FIG.4 (b)) after folding. It is the perspective view (FIG.5 (a)) before folding of other form 100D of the deep drawing package of this invention (FIG.5 (a)), and the perspective view after folding (FIG.5 (b)). It is a figure for demonstrating conditions (1).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lid material 20 Bottom material 20a-20m Deep drawing molding part 30a-30f Perforation cut, cutting 100A-100D Deep drawing package

Claims (7)

A deep-drawing package comprising a bottom material having a plurality of deep-drawn molded parts and a lid material heat-sealed to the bottom material,
A perforation cut or notch is formed in the bottom material and / or the lid material between two adjacent deep drawing molded portions arbitrarily selected from the plurality of deep drawing molded portions,
Deep drawing packaging that can be folded so that the two adjacent deep-drawn molded parts that are arbitrarily selected satisfy the following condition (1) with the perforation cut or incision as the crease and the lid material inside. body.
Condition (1): The adjacent two deep-drawn parts are pressed at 15 N ° C. for 10 seconds at 10 N / cm at the fold formed by folding the two adjacent deep-drawn parts at 180 °, and then the two adjacent deep-drawn parts. G / L <0. G, where G is the maximum gap generated between the lid members of the portion, and L is the maximum length from the fold line to the front end in the folding direction of the deep drawing portion. 05.   The perforation cut or incision is a perforation cut in which the ratio of the connection portion to the cut portion is 1: 1 to 5 and the connection portion is 0.5 mm or more and 2.0 mm or less, or the remaining thickness is 30 μm or more. The deep-drawn packaged body according to claim 1, which has a cut of 100 µm or less.   The deep-drawn packaged body according to claim 1 or 2, wherein the plurality of deep-drawn molded parts have different contents and / or shapes.   The deep drawn package according to any one of claims 1 to 3, wherein the two adjacent deep drawn packages can be separated from the fold.   The deep drawn package according to any one of claims 1 to 4, wherein the bottom material has a stretched film having a printed layer formed on a laminate surface as an outer layer.   The deep drawn package according to any one of claims 1 to 5, wherein the bottom material has an amorphous polyester base material having a size of 150 µm or more and 500 µm or less.   The bottom material or the lid material has an easy peel layer having an easy peel strength of not less than 1.96 N / 15 mm width and not more than 14.7 N / 15 mm width at 25 ° C. as an inner layer or a layer adjacent to the inner layer. The deep drawn package according to any one of claims 1 to 6.

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