JP2006290438A - Easily openable deep drawn wrapper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deep drawn wrapper showing both a superior easy-opening property and an anti-pin hole property and capable of opening a lid member in a desired size. <P>SOLUTION: This deep drawn wrapper is attained by thermally connecting a bottom member 2 made by deep drawing and forming a laminated film including a seal layer having an easy-seal opening property through cohesive failure, a seal layer made of a thermoplastic resin and a lid member 4 formed by laminated film including an extension film having at least one directional linear cut at either one of intermediate layer and the outer-most layer or both intermediate layer and the outer-most layer without forming any perforation line at their peripheral edges. A peeling start part 6 not thermally connected is arranged in at least one location of the peripheral edges, and a cut part 8 is formed in such a direction as one crossing at a right angle with a liner cutting of the extension film of the lid member 4 on the peripheral edge where the peeling start part 6 is arranged. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a deep-drawn package, and more particularly to an easy-open deep-drawn package that can easily form an opening of a predetermined size in a lid material when opened.

  As shown in FIG. 2, conventionally, as a means for opening the deep-drawn package body 21, a cut portion 26 such as a V-notch is provided in the heat-bonding portion 28 of the deep-drawn package body 21 (see FIG. 2 a). A method (see FIG. 2B) in which the lid member 24 and the bottom member 22 are simultaneously torn from the portion 26 is common.

  However, in this unsealing means, a stretched film that is relatively easy to tear is usually used as a lid for the purpose of performing pitch printing, etc., while an unstretched film is used as a bottom material to provide deep drawability. It was done. Therefore, this unsealing means has a large difference in tear strength between the lid member and the bottom member, and is very difficult to tear. Especially when the bottom material is thick to prevent pinholes, or when a resin such as polypropylene homopolymer or polypropylene copolymer is used in the sealing layer as a retort packaging, use cutting tools such as cutters and scissors. It was difficult to open without using it.

  As shown in FIG. 3, as an easy-opening means for the deep-drawn package 31, an easy peel function such as cohesive failure is imparted to the seal layer of the bottom material 32 and the cover material 34, A method of peeling from a peeling start portion 36 of a portion (hereinafter also referred to as “non-sealed portion”) formed in the thermal bonding portion 38 that is not thermally bonded is known. However, with this opening means, for example, when the content 40 contains a large amount of liquid components such as sauce, the liquid component may be accidentally spilled when the cover material 34 is opened wide and the content 40 is taken out. May occur.

Furthermore, as a package that has an easy-open property and forms an opening of a certain area, a cut line formed on either the front or back laminate constituting the package, and at least one edge of the cut line A package in which a cut is formed is known (for example, see Patent Document 1). However, in this package, since the thickness of the cut line part formed to realize easy opening is thinner than other parts, the part is inferior in impact resistance, and a pinhole is generated by some impact. There was a possibility. In addition, when the package is transported by freezing, it becomes brittle than usual, which increases the risk of pinholes.
JP 2003-285848 A

  The present invention has been made to solve the above-mentioned problems of the package, and the object of the present invention is to have a good easy-opening property and pinhole resistance, and to open the lid material in a desired size. An object of the present invention is to provide a deep-drawn package that can be made.

In order to solve the above-described problems of the prior art, the inventor diligently studied a structure capable of easily opening the lid material in a desired size without providing a cut line portion in the lid material, and completed the present invention. It came to.
That is, the problem of the present invention is that any one of a bottom material obtained by deep-drawing a laminated film including a sealing layer having easy-openability due to cohesive failure, a sealing layer made of a thermoplastic resin, an intermediate layer, and an outermost layer Or a cover material made of a laminated film including a stretched film having a linear cut property in at least one direction without forming a score line on both the intermediate layer and the outermost layer, and obtained by thermal bonding at the periphery. A deep-drawn package body is provided with a peeling start portion not thermally bonded to at least one of the peripheral edges, and the lid material on the thermally bonded peripheral edge on the side where the peeling start portion is provided. This is achieved by forming a cut portion in a direction perpendicular to the linear cut direction of the stretched film included.

  When peeling from the peeling start portion disposed on the periphery of the deep-drawn package, first, cohesive failure occurs in the sealing layer of the lid material, and the thermal joint between the bottom material and the lid material peels off. Next, when the separation reaches the notch formed on the peripheral edge on the side where the separation start portion is disposed, the stretched film constituting a part of the lid material is torn in the linear cut direction, and the lid material is cut off. An opening having a predetermined area is formed in the portion where the lid member is cut, and the contents can be taken out from the opening.

  In the above easy-opening deep-drawn package, peeling is started by adopting a configuration in which the cut portion is disposed on the lid material side of the deep-drawn package or at the same position on both sides of the lid material and the bottom material. When the cover material and the bottom material are peeled from the portion and the separation reaches the cut portion, the cover material can be easily torn along the straight cut direction of the stretched film having straight cut properties from the cut portion. Thereby, a part of the lid member can be cut out to form an opening having a predetermined area in the deep-drawn package.

  In the easy-opening deep-drawn package, the delamination strength between the bottom seal layer and the lid is adjusted to 1 N / 15 mm width or more and 15 N / 15 mm width or less so that the lid material and the bottom material from the peeling start portion. Can be easily peeled off.

  The present invention has the above-described configuration, so that the base material and the thermal bonding portion of the lid material are peeled from the peeling start portion by cohesive failure of the bottom material seal layer, and when the peeling reaches the cut portion, the lid material The lid material can be cut off by being torn in the linear cut direction of the stretched film constituting a part of the film. Therefore, according to the present invention, an opening having a predetermined area can be formed in the portion where the lid member is cut, and the contents can be taken out from the opening. This is particularly effective when the contents are large or the contents contain a lot of liquid.

Hereinafter, the contents of the present invention will be described in detail with reference to the drawings.
1A to 1C are diagrams showing a preferred embodiment of the present invention and a method for opening the same, and FIGS. 2A and 2B and FIGS. 3A to 3C are embodiments of a conventional deep-drawn package. It is drawing which shows the opening method.

  1A to 1C, reference numeral 1 denotes a deep-drawn package body, reference numeral 2 denotes a bottom material, reference numeral 4 denotes a lid member, reference numeral 6 denotes a peeling start portion, reference numeral 8 denotes a cut portion, and reference numerals 10a and b denote lid materials. Reference numerals 12a and 12b denote thermal bonding portions on the side orthogonal to the linear cut direction, reference numerals 14a and b denote thermal bonding portions on the same direction side as the linear cut direction of the lid member, reference numeral 14 denotes an opening, and reference numeral 16 denotes contents. 2A and 2B, reference numeral 21 denotes a deep-drawn package body, reference numeral 22 denotes a bottom material, reference numeral 24 denotes a lid member, reference numeral 26 denotes a cut portion, and reference numeral 28 denotes a thermal bonding portion. Further, in FIGS. 3A to 3C, reference numeral 31 is a deep-drawn package body, reference numeral 32 is a bottom material, reference numeral 34 is a lid member, reference numeral 36 is a peeling start portion, reference numeral 38 is a thermal bonding portion, and reference numeral 40 is contents. Represent each.

  As shown in FIG. 1, the bottom material 2 constituting the deep-drawn package body 1 includes a seal layer having easy openability due to cohesive failure. The laminated film used in the bottom material 2 has a sealing layer in order to easily peel the bottom material 2 and the lid material 4 from the peeling start portion 6 which is a non-sealing portion disposed on the periphery of the deep drawn package. An easy peel material having cohesive fracture properties is preferred. As the easy peel material, one or more kinds selected from resins having easy-openability due to cohesive failure can be appropriately selected and used. For example, at least one selected from the group consisting of ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, low-density polyethylene, linear low-density polyethylene, and ionomer A resin obtained by blending a resin with at least one resin selected from the group consisting of polypropylene homopolymer, polypropylene copolymer, and polybutene-1 can be suitably used.

  As an intermediate layer and an outermost layer (outer layer opposite to the seal layer) of the laminated film constituting the bottom material 2, saponified ethylene-vinyl acetate copolymer, polyamide resin, polypropylene homopolymer, polypropylene copolymer, linear low It is effective to use at least one selected from the group consisting of high density polyethylene and low density polyethylene.

  In order to impart oxygen barrier properties, it is effective to use a saponified ethylene-vinyl acetate copolymer, and the use of such a resin improves the preservability of food. However, when a high oxygen barrier is not necessary, a certain amount of oxygen barrier can be provided by arranging a polyamide resin.

  In order to impart pinhole resistance and deep drawability, it is effective to dispose polyamide resin. Such a polyamide resin is not particularly limited, but it is preferable to use a nylon resin from the viewpoint of pinhole resistance. Examples of the nylon resin include polymers of condensation units such as 6 nylon, 66 nylon, 69 nylon, 6-66 nylon, 12 nylon, 11 nylon, 610 nylon, 612 nylon, 6I-6T nylon, MXD6 nylon, and the like. Mention may be made of copolymers with more than one species and also mixtures thereof. Among them, it is preferable to use 6 nylon or 6-66 nylon.

  In order to impart freezing impact resistance, it is effective to dispose a linear low density polyethylene layer and a low density polyethylene layer as the outermost layer.

  As the linear low-density polyethylene used above, copolymers with α-olefins such as butene-1, hexene-1, 4-methylpentene-1, octene-1 are mainly used, but are particularly limited. It is not something. In addition, linear low density polyethylene polymerized using a metallocene catalyst can be suitably used because of its narrower molecular weight distribution and better strength.

  Furthermore, in order to provide voile resistance (particularly, prevention of curling during boiling and retorting), it is effective to dispose a polypropylene homopolymer layer and a polypropylene copolymer layer as the outermost layer.

  Furthermore, an adhesive layer can be provided as necessary for the purpose of increasing the delamination strength of each layer. Adhesive resins that can be used as the adhesive layer include polyethylene resins such as low density polyethylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene, olefin resins such as polypropylene resin, ethylene-vinyl acetate copolymer, ethylene -Methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate-maleic anhydride copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer Examples thereof include ethylene copolymer resins such as polymers and ethylene ionomers, and other modified polyolefin resins such as ethylene-vinyl acetate copolymers or ethylene elastomers and monobasic substances such as acrylic acid or methacrylic acid. Unsaturated fatty acid Or maleic acid, those chemically bonded anhydride of dibasic fatty acids such as fumaric acid or itaconic acid can be exemplified. Among them, it is preferable to use an adhesive resin based on PP.

  As shown in FIG. 1, the lid member 4 constituting the deep-drawn package body 1 has at least one of the intermediate layer and the outermost layer, or both the intermediate layer and the outermost layer without forming a score line. A stretched film having a linear cut property in the direction is disposed, and a laminated film in which a thermoplastic resin that can be thermally bonded to the seal layer of the bottom material 2 is further disposed as a seal layer.

  The laminated film constituting the lid material 4 of the present invention is a stretched film that is linearly cut in at least one direction even if a cut line is not formed in the laminated film using a cutting blade or the like in the manufacturing process as in the prior art. Including sex. In this specification, “straight cut property” means that a tearing stress is applied when a notch of a predetermined size is formed in a stretched film and a tearing stress of a certain size is applied to the stretched film from the notch. The characteristic that a stretched film is torn linearly in the same direction as the applied direction. In the present invention, by including a stretched film having a straight-cut property in the lid material 4, it is possible to provide excellent pinhole resistance (impact resistance) and to provide a deep-drawn package suitable for freezing transportation. it can.

  Examples of the resin constituting the stretched film having linear cut property include polyethylene terephthalate, polyamide, polyethylene, polypropylene, and polystyrene. Among them, polyethylene terephthalate and polyamide can be suitably used.

  A stretched film having a linear cut property is obtained by forming a resin such as polyethylene terephthalate into a sheet shape by an extruder and then stretching it at least in a uniaxial direction.

  As a stretched film having linear cutting properties, biaxially stretched polyethylene terephthalate film Emblet PC (manufactured by Unitika Ltd.), biaxially stretched nylon film Emblem NC (manufactured by Unitika Ltd.), uniaxially stretched polypropylene film Mitsui Noblen Film ASCM (Mitsui Chemicals Platec Co., Ltd.) Uniaxially stretched polyethylene film Mitsui Hi-Bron Film (Mitsui Chemicals Platec Co., Ltd.) etc. can be used conveniently.

  Further, when a stretched film having linear cut properties is not disposed in the outermost layer, it is effective to use biaxially stretched polyethylene terephthalate, biaxially stretched polyamide, and biaxially stretched polypropylene as the outermost layer. When heat-bonding the bottom material 2 and the lid material 4 of the deep-drawn package, sealing heat is applied from the outermost layer side of the lid material 4, but when the stretched film is disposed in the outermost layer, This is effective because it suppresses stickiness of the lid member 4 and the lid member 4 is difficult to extend and wrinkles are less likely to enter the lid member 4.

  The seal layer forming the innermost layer of the lid member 4 is made of a thermoplastic resin layer. The thermoplastic resin layer is not limited as long as it contains a thermoplastic resin as a main component and can be thermally bonded by heating, and may be formed as a stretched or unstretched film. The thermoplastic resin can be arbitrarily selected so as to have an appropriate heat seal strength in consideration of the material of the seal layer of the bottom member 2 that is the adherend of the lid member 4. For example, as thermoplastic resin, ethylene resin, olefin resin such as propylene resin, styrene resin, ester resin, adhesion to ethylene resin, styrene resin or styrene resin having adhesiveness with ester resin Examples thereof include ethylene-based resins having properties.

  Examples of the ethylene resin include polyethylene resins such as ultra-low density polyethylene, linear low density polyethylene, low density polyethylene, medium density polyethylene, and high density polyethylene; ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer Ethylene-based copolymers such as copolymers, ethylene-ethyl acrylate copolymers, ethylene-methyl acrylate copolymers, ethylene-ethyl acrylate-maleic anhydride copolymers, ethylene-acrylic acid copolymers, ethylene-methacrylic acid copolymers, etc. Polymers; further, metal neutralized products of ethylene-acrylic acid copolymers, metal neutralized products of ethylene-methacrylic acid copolymers, and the like. As the metal neutralized product of the ethylene-methacrylic acid copolymer, for example, at least 10 mol%, preferably 10 mol% or more and 60 mol% or less of the carboxyl group is a metal ion such as sodium or zinc. What is summed up.

  As the propylene resin, a random copolymer or a polypropylene resin subjected to a polymerization reaction using a metallocene catalyst can be suitably used.

  As other propylene-based resins, from the viewpoint of being inexpensive and excellent in molding processability, sealability, etc., copolymers of propylene and other α-olefins such as propylene-ethylene copolymers, propylene-butene copolymers Among them, a propylene-ethylene copolymer, for example, a propylene-ethylene copolymer having an ethylene-derived component content of 2% by mass to 10% by mass is preferable. As these copolymers, either random copolymers or block copolymers can be used, but random copolymers are preferred.

  Examples of the styrenic resin include polystyrene, styrene copolymers in which a small amount of rubber and other vinyl monomers are copolymerized with the styrene monomer. Examples of other vinyl monomers include styrene monomers such as α-methylstyrene and p-methylstyrene, acrylonitrile, methyl acrylate, methyl methacrylate, acrylic acid, methacrylic acid, and maleic anhydride. Can be mentioned. Moreover, the usage-amount of a rubber part is 0.1 mass% or more and 20 mass% or less normally, and the usage-amount of another vinyl-type monomer is 0.1 mass% or more and 30 mass% or less normally. Preferred examples of the styrene resin include polystyrene and high impact polystyrene (HIPS) which is a copolymer of diene rubber and styrene.

  Furthermore, each layer may further contain additives such as a heat stabilizer, an oxidation stabilizer, a weather stabilizer, an ultraviolet absorber, a pigment, and a dye that do not impair the effects of the present invention.

Next, the shape of the deeply drawn package and the opening means in the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1A, the bottom material 2 in the deep-drawn package body 1 is deep-drawn into, for example, an inverted mesa shape or a concave shape, and has a shape having a peripheral edge that can be thermally bonded to the lid material 4. Can do. The bottom member 2 and the lid member 4 having a shape that can be sealed at the periphery of the bottom member 2 are thermally bonded by thermal bonding portions 10 a, 10 b, 12 a, and 12 b formed on the periphery of the bottom member 2. The deep-drawn package body 1 can easily peel the bottom material 2 and the lid material 4 by the cohesive failure of the seal layer of the bottom material 2 in the thermal bonding portions 10a to 12b.

  A peeling start portion 6, which is a non-sealed portion that is not thermally bonded, is formed in the thermal bonding portions 10 a to 12 b between the bottom material 2 and the lid material 4. The position at which the peeling start portion 6 is formed is not particularly limited as long as it is at least one of the thermal bonding portions 10a to 12b. However, in the case of a deep drawn package having the shape shown in FIGS. From this point, it is preferable to be formed at any one of the four corners.

The cut portion 8 is a thermally bonded peripheral edge (thermal bonding portion 10a) on the side where the peeling start portion 6 is disposed, and is formed in a direction orthogonal to the linear cut direction of the stretched film included in the lid material 4. The
The shape of the cut portion 8 is such that only the cover material 4 is torn along the straight cut direction of the cover material 4 from the cut portion 8 after the peeling between the bottom material 2 and the cover material 4 reaches the cut portion 8. If it is, it will not specifically limit. For example, a V shape or an I shape can be preferably used. Further, the cut portion 8 needs to be formed in at least the cover member 4 so as to tear the cover member 4 linearly in a predetermined direction, but the same position and the same as the cut portion 8 formed in the cover member 4. A cut portion having a shape may be formed in the bottom material 2. 1A to 1C, the cut portion 8 is formed in one place with the same shape at the same position on both the bottom member 2 and the lid member 4, but may be formed at several places as necessary. .

  As a means for forming the cut portion 8, it can be formed by using a raw material for a lid material in which a convex portion having the same shape as that of the cut portion 8 is previously installed at a predetermined position. Furthermore, the cutting part 8 can also be directly formed using a cutting tool such as a cutter in the heat-bonding part 10a of the deep-drawn package body in which the contents are filled and the bottom material 2 and the cover material 4 are heat-bonded.

  FIG. 1B shows an unsealed state until the peeling between the bottom material 2 and the lid material 4 reaches the notch 8. When the bottom material 2 and the lid material 4 are peeled from the peeling start portion 6, as shown in FIG. 1B, the peeling proceeds along the direction of the thermal bonding portions 10a and 12a.

  FIG. 1-c shows an opened state after the peeling between the bottom material 2 and the lid material 4 reaches the cut portion 8. When the peeling of the thermal bonding portion 10a reaches the cut portion 8, the peeling of the thermal bonding portion 10a stops at the cut portion 8, and the lid member 4 is torn linearly in the direction perpendicular to the cut portion 8, and at the same time the cutting direction The thermal bonding part 12a on the same direction side is further peeled off. Thereby, as shown in FIG. 1-c, the lid member 4 is peeled off, and an opening 14 having a predetermined area can be easily formed between the bottom member 2 and the lid member 4, and a large content can be easily obtained. Can be taken out. In particular, even when the content 16 contains a large amount of liquid, the lid 4 is opened with the side on which the opening 14 is formed facing upward, so that the liquid is placed outside the deep-drawn package body 1. The contents 16 can be taken out without leaking. Further, the opening area can be freely changed by changing the formation position of the cut portion 8.

The delamination strength between the bottom material 2 and the lid material 4 of the deep-drawn package of the present invention is 1 N / 15 mm width to 15 N / 15 mm width, preferably 2 N / 15 mm width to 10 N / 15 mm width, more preferably 3 N / 15 mm width or more and 7 N / 15 mm width or less is required.
When the delamination strength is 1 N / 15 mm width or more, even when an impact is applied to the deep-drawn package, it is possible to minimize the breakage of the seal. Moreover, if the delamination strength is 10 N / 15 mm width or less, the bottom material 2 and the lid material 4 can be easily peeled simultaneously from the peeling start portion 6. In particular, in FIG. 1-c, it is necessary to peel off the thermal bonding portion 12a at the same time as tearing the lid member 4 linearly in the cutting direction, but the tearing speed of the lid member 4 in the cutting direction and the thermal bonding portion 12a By making the peeling rate substantially the same, an opening having a predetermined area can be easily formed.

  Hereinafter, the easily openable deep-drawn package of the present invention will be described more specifically with reference to examples, but the present invention is not limited to the contents of the examples. In the following description, the abbreviations are as follows.

6Ny: 6 nylon resin (Novamid 1030 manufactured by Mitsubishi Engineering Plastics)
6-66Ny: 6-66 nylon resin
(Novamid 2030 manufactured by Mitsubishi Engineering Plastics)
AD: Acid-modified polyolefin (Admer QF500, Mitsui Chemicals)
PP: Polypropylene copolymer resin (Novatec PP FW3E, manufactured by Nippon Polypro)
LL: Linear low density polyethylene (Novatec LL UF240, manufactured by Nippon Polyethylene)
PET: Biaxially stretched polyethylene terephthalate film (Embret PET manufactured by Unitika)
ONy: Biaxially stretched polyamide film (Santoniel SNR, manufactured by Mitsubishi Plastics)
Straight-cut PET: Stretched polyethylene terephthalate film with straight-cut function
(Embret PC Unitika)
Straight cut property ONy: Stretched polyamide film with straight cut function
(Emblem NC Unitika)
CPP: Unstretched polypropylene film (Tosero CP GHC, manufactured by Tosero)

<Evaluation method>
A deep-drawn package was produced using the bottom material and the lid material shown in the following Examples and Comparative Examples. First, after deep-drawing the bottom material with a deep-drawing machine (FV6300 manufactured by Omori Machine Industry Co., Ltd.), the contents are filled with boiled salmon (100 g) and sauce of boiled fish (80 g) and covered with a lid. Vacuum packaging was performed at a heat seal temperature of 150 ° C. for 2 seconds. Subsequently, the deep-drawn package was subjected to retort sterilization at 120 ° C. for 20 minutes, and the following evaluation was performed.

(Openability)
Without using a cutting tool such as scissors, spilled salmon fish smoothly without spilling the sauce on the outside of the deep-drawn package, ○ spill the sauce on the outside of the deep-drawn package Those that could not easily extract boiled sea bream were marked with ×.

(Pinhole resistance)
When the deep-drawn package is stored for 48 hours in an atmosphere of −10 ° C. and 20 deep-drawn packages are packaged in corrugated cardboard, a pinhole is generated at all when dropped 20 times from a height of 1 m. The case where there was no pinhole, such as a case where there was no pinhole, such as cracking of the lid material, was indicated as ×.

(Delamination strength between bottom seal layer and bottom material)
In the deep-drawn package after performing retort sterilization at 120 ° C. for 20 minutes, a heat-bonded portion in the bottom material film and the lid material film is cut into a strip of 15 mm width, and a test piece is prepared. (Intesco Co., Ltd.) was used to measure the strength when the bottom material and the cover material were peeled off at 200 mm / min and a temperature of 23 ° C.

(Example 1)
<Bottom material>
A laminated film having the following layer structure was formed by coextrusion to produce a bottom material. The parentheses indicate the thickness of each layer, and the unit is μm (hereinafter the same). In addition, “/” indicates that the layers described before and after that are bonded by a co-extrusion method, and “//” indicates that the layers described before and after that are bonded by a dry lamination method. Each of them.
6Ny (20) / AD (10) / 6-66Ny (45) / AD (10) / PP (90) / Sealing layer (5)
Seal layer: PP 50% by mass + LL 50% by mass of blend resin <Cover>
A lid was prepared from a laminated film laminated by dry lamination in the order of ONy, straight-cut PET, and CPP. In addition, the linear cut direction of the used linear cut property PET is a film flow direction.
ONy (15) // Linear cutting PET (12) // CPP (50)
<Deep-drawn package shape>
Thermal bonding on the side where the peeling start portion is installed at any one of the four corners of the peripheral edge of the deep-drawn package, perpendicular to the flow direction of the linear cut PET film of the lid, and where the peeling start portion is installed A deep-drawn package having a V-shaped cut portion formed in the part.

(Example 2)
<Bottom material>
A bottom material of a laminated film having the same configuration as in Example 1 was produced in the same manner.
<Cover material>
The following lid material was prepared from a laminated film obtained by dry laminating in the order of linear cut ONy, linear cut PET, and CPP. In addition, the linear cut direction of used linear cut property ONy and linear cut property PET is a flow direction of a film.
Straight cut property ONy (15) // Linear cut property PET (12) // CPP (50)
<Deep-drawn package shape>
A deep drawn package having the same shape as in Example 1 was obtained.

Example 3
<Bottom material>
A laminated film having the following layer structure was formed by coextrusion to produce a bottom material.
6Ny (20) / AD (10) / 6-66Ny (45) / AD (10) / PP (90) / Sealing layer (5)
Seal layer: PP 65 mass% + LL 35 mass% blend resin <Cover>
A bottom material of a laminated film having the same configuration as in Example 1 was produced in the same manner.
<Deep-drawn package shape>
A deep drawn package having the same shape as in Example 1 was obtained.

(Comparative Example 1)
<Bottom material>
A laminated film having the following layer structure was formed by a coextrusion method to produce a bottom material.
6Ny (20) / AD (10) / 6-66Ny (45) / AD (10) / PP (90) / Sealing layer (5)
Seal layer: PP 100% by mass
<Cover material>
A lid was prepared from a laminated film having the same layer structure as the lid used in Example 1.
<Deep-drawn package shape>
No peeling start part is installed at the periphery of the deep-drawn package, and a V-shaped cut part is formed in the thermal bonding part that is orthogonal to the flow direction of the linear-cutting PET film of the lid. A deep drawn package was obtained.

(Comparative Example 2)
<Bottom material>
A bottom material was produced from a laminated film having the same layer structure as in Example 1.
<Cover material>
A lid was prepared from a laminated film having the same layer structure as in Example 1.
<Deep-drawn package shape>
The deep-drawing package was a deep-drawing package in which a peeling start portion was installed at any one of the four corners of the peripheral edge of the deep-drawing package, and no V-shaped cut portion was installed in the heat-bonded portion.

(Comparative Example 3)
<Bottom material>
A laminated film having the following layer structure was formed by coextrusion to produce a bottom material.
6Ny (20) / AD (10) / 6-66Ny (45) / AD (10) / PP (90) / Sealing layer (5)
Seal layer: PP 80% by mass + LL 20% by mass of blend resin <Cover>
A lid was prepared from a laminated film having the same layer structure as in Example 1.
<Deep-drawn package shape>
A deep drawn package having the same shape as in Example 1 was obtained.

(Comparative Example 4)
<Bottom material>
A bottom material was produced from a laminated film having the same layer structure as in Example 1.
<Cover material>
A lid was prepared from a laminated film laminated in the order of ONy, PET, and CPP by the dry laminating method.
ONy (15) // PET (12) // CPP (50)
<Deep-drawn package shape>
A deep drawn package having the same shape as in Example 1 was obtained.

(Comparative Example 5)
<Bottom material>
A bottom material was produced from a laminated film having the same layer structure as in Example 1.
<Cover material>
A laminated film having the following layer structure was formed by a coextrusion method to produce a lid material.
6Ny (10) / AD (5) / 6-66Ny (20) / AD (5) / PP (40)
<Deep-drawn package shape>
A deep drawn package having the same shape as in Example 1 was obtained.

(Comparative Example 6)
<Bottom material>
A bottom material was produced from a laminated film having the same layer structure as in Example 1.
<Cover material>
A lid was prepared from a laminated film having the following layer structure.
ONy (15) // PET (12) // CPP (50)
In order to improve the linear tearability, a score line having a depth that penetrates the ONy layer was formed in the ONy layer flow direction of the outermost layer of the lid material.
<Deep-drawn package shape>
The peeling start part is installed at any one of the four corners of the peripheral edge of the deep-drawn package, and the cut line is perpendicular to the cut line formed on the ONy layer of the lid and on the side where the peeling start part is installed. It was set as the deep-drawing package body in which the cut was formed corresponding to.

From Table 1, the deep-drawn package having the configuration of the present invention was good in all of the opening property, pinhole resistance and delamination strength (Example 1). Further, when a resin having a linear cut property was used for both the intermediate layer and the outermost layer of the lid member, the cut property was increased, and the opening could be formed more easily (Example 2). Furthermore, even when the delamination strength is increased by changing the blend ratio of the blend resin constituting the bottom seal layer, it is possible to maintain an appropriate unsealing property (Example 3).
On the other hand, the deep-drawn package of Comparative Example 1 was a type in which the deep-drawn package was a type that simultaneously teared the unstretched bottom material together with the lid material from the cut portion, and thus could not be easily torn. Moreover, since the deep-drawn package of Comparative Example 2 was a type in which the contents of the deep-drawn package were removed from the peeling start portion by peeling the lid and the bottom material of the deep-drawn package, An opening could not be formed, and it was difficult to take out the contents without spilling the contents. In addition, the deep-drawn package of Comparative Example 3 has a high content of the polypropylene resin of the blend resin constituting the sealing layer of the bottom material, so that the delamination strength between the bottom material and the lid material becomes too strong, The straight cut and the peeling of the thermal joining portion on the peeling start portion side in the same direction as the straight cut direction could not be performed at the same time, and good unsealing properties were not obtained.
In addition, the deep-drawn package of Comparative Example 4 does not include a stretched film having a straight-cut property, so that the lid cannot be torn straight when the lid is torn from the cut portion. An opening having a predetermined area could not be formed in the package. Moreover, since the deep-drawn package of Comparative Example 5 includes an unstretched film in the lid material, the lid material could not be easily torn from the cut portion. In addition, the deep-drawn package of Comparative Example 6 could easily form an opening with a predetermined area in the lid during peeling, but was poor in pinhole resistance during freezing.

  The easy-open deep-drawn package of the present invention has easy-open properties and pinhole resistance, and can easily form an opening of a predetermined size in the lid material when opened. A deep-drawn package that can be used and is particularly suitable for refrigerated transport.

It is explanatory drawing which shows suitable embodiment of the deep drawing package of this invention. It is explanatory drawing which shows the unsealed state until peeling reaches | attains a notch part. It is explanatory drawing which shows the unsealed state after peeling reaches | attains the notch part. It is explanatory drawing (the 1) which shows the state before opening of the embodiment of the conventional deep drawing package. It is explanatory drawing which shows the open state of the conventional deep drawing package. It is explanatory drawing (the 2) which shows the state before opening of the embodiment of the conventional deep drawing package of the past. It is explanatory drawing (the 1) which shows the open state of the conventional deep drawing package. It is explanatory drawing (the 2) which shows the unsealed state of the conventional deep drawing package.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Deep drawing package body 2 Bottom material 4 Lid material 6 Peeling start part 8 Notch part 10a, b The heat | fever junction part 12a, b of the side orthogonal to the linear cut direction of a cover material The same direction side as the linear cut direction of a cover material Heat-bonding part 14 Opening part 16 Contents 21 Deep-drawing package body 22 Bottom material 24 Cover material 26 Cut-in part 28 Heat-joining part 31 Deep-drawing package body 32 Bottom material 34 Lid material 36 Peeling start part 38 Heat-bonding part 40 Contents object

Claims (3)

A bottom material obtained by deep drawing a laminated film including a sealing layer having easy-openability due to cohesive failure;
A lid material made of a laminated film comprising a sealing layer made of a thermoplastic resin and a stretched film having a linear cut property in at least one direction without forming a score line in either or both of the intermediate layer and the outermost layer; A deep-drawn package obtained by thermal bonding at the periphery,
A stretch start film that is not thermally bonded to at least one of the peripheral edges is disposed, and a straight line of the stretched film included in the lid material is disposed on the thermally bonded peripheral edge on the side where the peel start section is disposed. An easy-open deep-drawn package characterized in that a cut portion is formed in a direction perpendicular to the cutting direction.   The easy-open deep-drawn package according to claim 1, wherein the cut portion is disposed on the lid member side or at the same position on both sides of the lid member and the bottom member.   The easy-open deep-drawn package according to claim 1 or 2, wherein the delamination strength between the sealing layer of the bottom member and the lid member is 1 N / 15 mm width or more and 15 N / 15 mm width or less.

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