WO2022168444A1

WO2022168444A1 - Resinous oriented film and filling packaging body using same

Info

Publication number: WO2022168444A1
Application number: PCT/JP2021/045867
Authority: WO
Inventors: 大介小笠原; 公文加藤
Original assignee: 株式会社クレハ
Priority date: 2021-02-04
Filing date: 2021-12-13
Publication date: 2022-08-11
Also published as: CN116829471A; JP2022119350A; KR20230125294A

Abstract

Provided are a resinous oriented film presenting a filling packaging body that can firstly suppress a winding deviation of the film in a manufacturing process thereof even though the film has indentations, secondly hardly causes film breakage in a manufacturing process of the filling packaging body, and is thirdly able to easily open from an outer ear part after undergoing pressure/heat sterilization (heat treatment), and a filling packaging body using the same.　The resinous oriented film according to the present invention has indentations. The indentations do not penetrate the resinous oriented film. The resinous oriented film has an indentation row, in which the indentations are arranged side by side in a longitudinal direction of the resinous oriented film, at a side edge part away from the side end of the resinous oriented film by 0.50 mm to 15 mm. An interval in the longitudinal direction between the indentations is 2.0 mm to 3.9 mm. The indentations have a width of 0.65 mm to 3.5 mm in a short direction of the resinous oriented film.

Description

Stretched resin film and filling package using the same

The present invention relates to a stretched resin film and a filled package using the same.

Filled packages filled with contents such as solid or pasty processed foods such as sausages, cheeses, hamburgers, and uirou are usually obtained by longitudinally sealing both side edges extending in the longitudinal direction of a strip-shaped resin film. The inside of the formed cylindrical resin film having a vertical seal portion extending in the longitudinal direction is filled with the content such as the processed food, and both ends of the cylindrical resin film in the longitudinal direction are covered with aluminum. The structure is bundled and sealed by metal wire clips such as wire clips or lateral sealing films (reinforcement tapes) or other means. Resins that form the cylindrical resin film provided in the filling package include polyolefin resins (polyethylene, polypropylene, etc.), polyamide resins (nylon-6, etc.), polyester resins (polyethylene terephthalate, etc.), polychlorinated Vinyl-based resins, polyvinylidene chloride-based resins, and the like are used, and polyvinylidene chloride-based resins are preferably used from the viewpoint of excellent oxygen gas barrier properties and a balance between heat resistance and strength.

In order to peel off the cylindrical resin film from these filling packages and take out the processed food, etc., the bundled portions at both ends in the longitudinal direction of the cylindrical resin film are cut and removed. Alternatively, the cylindrical resin film is cut, for example, along the longitudinally sealed portions of both side edges extending in the longitudinal direction, or in a direction orthogonal to the longitudinally sealed portions to expose the contents. There is a need. However, a tubular resin film, for example, a tubular resin film made of a polyvinylidene chloride resin, is tough, so when a consumer takes out the contents, it is difficult to open the contents with just the force of fingers. may not be possible. In this case, a cutting tool such as scissors or a knife must be prepared for cutting, or even if a cutting tool is used, the contents may not be exposed satisfactorily. .

For the purpose of providing an easily openable filling package from which contents can be easily taken out, for example, Patent Document 1 discloses that both side edges of a heat shrinkable film are attached to the heat shrinkable film. A tubular film that is superimposed so that the front and back surfaces face each other and is sealed in the longitudinal direction, and a sealing member that seals both ends of the tubular film filled with a content. The side edge portion having a row of scars forms an outer ear piece protruding in a belt shape from the outside of the tubular film, and the longitudinal distance between the scars on the side edge portion after heat treatment is 3.0 mm to 28 mm. , a sealed package is disclosed.

JP 2020-37431 A

However, in the method described in Patent Document 1, since a scratch that penetrates the film is given, film waste is generated during production, and there is a risk that the film waste will be mixed into the filled package. There is a possibility that the tension applied to the film may cause a crack to occur from the scar and the film to break. In addition, the distance between the scars in the longitudinal direction is long, and it is difficult to say that easy-openability is sufficiently achieved.

As one means of solving this problem, it is conceivable to provide indentations in the outer ear portion of the filling package at short intervals in the longitudinal direction. Such a filled package having dents on the outer ear is manufactured using a raw film having dents on the side edges. Specifically, the film is unrolled from a roll-shaped original film, both side edges are overlapped and longitudinally sealed to form a cylinder, and if necessary, the film is cut to an appropriate length. However, if the impressions are simply provided, the side edges of the roll of the raw film having the impressions will be raised (the ends will be thicker than the central part in the axial direction of the roll), and the film will not be wound. Due to misalignment (when the film is wound into a roll, the end surface of the roll becomes uneven), it becomes difficult to feed the film flat, and the film cannot be formed into a cylindrical shape. In addition, it is not necessarily sufficient to simply give an impression to the outer ear portion of the filling package, although it makes it easier to open the package.

The present invention has been made in view of the above problems. In the manufacturing process, it is difficult for the film to break, and thirdly, after pressurized heat sterilization (heat treatment), a stretched resin film that gives a filled package that can be easily opened from the outer ear and using the same An object of the present invention is to provide a filling package.

The present inventors have proposed a stretched resin film having indentations, wherein the indentations do not penetrate the stretched resin film, and the stretched resin film is arranged at a predetermined position with a predetermined interval and a predetermined width. MEANS TO SOLVE THE PROBLEM It discovered that the said subject was solvable with the resin-made stretched films which have an indentation row|line, and came to complete this invention.

The stretched resin film according to the present invention has an indentation, the indentation does not penetrate the stretched resin film, and the stretched resin film is 0.50 mm to 15 mm from the side edge of the stretched resin film. The indentations on the side edges have rows of indentations aligned in the longitudinal direction of the stretched resin film, and the distance between the indentations in the longitudinal direction is 2.0 mm to 3.9 mm. The width of the impression in the hand direction is 0.65 mm to 3.5 mm.

In the stretched resin film, the number of indentation rows is preferably 1 to 20 rows.

The stretched resin film preferably contains a vinylidene chloride resin.

The filling package according to the present invention is a cylindrical tubular body in which both side edges of the stretched resin film according to the present invention are superimposed so that the front and back surfaces of the stretched resin film face each other, and are longitudinally sealed in the longitudinal direction. A filled package in which a content is filled in a stretched resin film and both ends are sealed, wherein a side edge portion having an indentation row of the stretched resin film is outside the tubular stretched resin film. Form an outer ear part protruding in a strip shape.

The filled package is preferably heat-treated.

The filling package preferably has a through-hole instead of at least part of the indentation.

In the filling package, the outer ear portion has a through-hole row in which the through-holes are aligned in the longitudinal direction of the outer ear portion at a side edge portion of 0.20 mm to 8.0 mm from the side end of the outer ear portion, It is preferable that the through-holes have a longitudinal interval of 1.0 mm to 2.9 mm, and a width of the through-holes in the lateral direction of the outer ear portion of 0.30 mm to 2.7 mm.

According to the present invention, the above problems can be solved. That is, even if the stretched resin film of the present invention has an indentation, it is possible to suppress the winding misalignment of the film in the manufacturing process, and the film breaks in the manufacturing process of the filled package. Hateful. Moreover, the stretched resin film according to the present invention provides a filled package that can be easily opened from the outer ear portion after being sterilized under pressure and heat (heat treatment).

The perspective view of the resin stretched film of this embodiment is shown. The sectional view of the indentation of the stretched resin film of the present embodiment is shown. The front view of the indentation of the resin stretched film of this embodiment is shown. FIG. 4 shows another aspect of the front view of the indentation of the stretched resin film of the present embodiment. FIG. 4 shows another aspect of the front view of the indentation of the stretched resin film of the present embodiment. FIG. 4 shows another aspect of the front view of the indentation of the stretched resin film of the present embodiment. 1 shows one aspect of the indentation rows of the stretched resin film of the present embodiment. 3 shows another aspect of the indentation row of the stretched resin film of the present embodiment. An example of a method for imparting an indentation according to the present embodiment will be shown. 1 shows one aspect of the filling package of the present embodiment.

Hereinafter, an embodiment of the present invention (hereinafter referred to as "this embodiment") will be described in detail, but the present invention is not limited to this, and various modifications are possible without departing from the gist thereof. is.

[Cylindrical stretched resin film]
The filled package of the present invention is a filled package comprising a tubular stretched resin film and a content, wherein the tubular stretched resin film is provided with a longitudinal seal portion having an outer ear portion extending in the longitudinal direction. , with both ends in the longitudinal direction converging.

The stretched resin film according to the present invention is a stretched resin film having indentations (marks formed when pressed or pressure is applied), wherein the indentations do not penetrate the stretched resin film, The resin stretched film has an indentation row in which the indentations are arranged in the longitudinal direction of the resin stretched film at a side edge portion of 0.50 mm to 15 mm from the side end of the resin stretched film, The distance in the longitudinal direction is 2.0 mm to 3.9 mm, and the width of the impression in the lateral direction of the stretched resin film is 0.65 mm to 3.5 mm.

As a stretched resin film that forms a cylindrical stretched resin film, there has conventionally been filled packaging in which contents such as processed foods such as sausages, processed cheeses, hams and hamburgers are filled and sealed and individually packaged in a hermetically sealed manner. A stretched resin film that is used to form a cylindrical stretched resin film that is attached to the body can be used.

[Heat shrinkage rate]
The stretched resin film of the present invention preferably has heat shrinkability, and the heat shrinkage at 100° C. in the MD (longitudinal direction of the film) is preferably 19% to 35%, more preferably 19% to 25%. %. Also, the thermal shrinkage at 100° C. in TD (transverse direction of the film) is preferably 19% to 30%, more preferably 19% to 25%. By setting the heat shrinkage ratios of MD and TD at 100° C. to 19% or more, through-holes are easily formed after heat treatment of the filled package. Further, by setting the heat shrinkage rate at 100° C. to 35% or less in MD and 30% or less in TD, bending and shrinkage of the filled package can be suppressed after the filled package is heat-treated.

[Indentation]
Indentations on the stretched resin film of the present embodiment will be described with reference to FIG. 1, which is a perspective view of the stretched resin film, and FIGS. As shown in FIG. 1, the stretched resin film 1 of this embodiment has an indentation 4 on at least a part of the side edge portion 3 which is a region of 0.50 mm to 15 mm from the side end 2 . Here, it is not necessary for all the side edges to have the indentation 4, and as a preferred embodiment, one side edge of the side edges along the MD (longitudinal direction of the film) should have the indentation.

As shown in FIG. 2, the depth a of the indentation 4 that does not penetrate the stretched resin film 1 is preferably 10% with respect to the total film thickness before indentation (the thickness of the two laminated layers in the case of two-layer lamination). % to 90%, more preferably 20% to 60%. By setting the depth a of the indentation 4 to 10% or more of the total thickness of the film before applying the indentation, opening is facilitated, and by setting it to 90% or less, film breakage during the manufacturing process is suppressed. Further, the shape of the indentation 4 is not particularly limited, and as shown in FIGS.

The indentations 4 are arranged in the longitudinal direction (MD in FIG. 1) to form an indentation row 5. The number of indentation rows is preferably 1 to 20 rows, more preferably 1 to 3 rows, and even more preferably 2 rows. Further, as shown in FIGS. 7 and 8, when there are a plurality of indentation rows 5, the positions of the indentations 4 of the adjacent indentation rows 5 may be at the same position in the longitudinal direction or at different positions. Alternatively, the intervals between the indentations 4 in the indentation rows 5 may be the same or different between the rows. Furthermore, the intervals between the indentations 4 in the same row may be uniform or non-uniform as long as they satisfy a predetermined range (2.0 mm to 3.9 mm).

As shown in FIGS. 7 and 8, the interval b between the indentations 4 in the indentation row 5 is 2.0 mm to 3.9 mm, preferably 2.5 mm to 3.5 mm, and more preferably 2.5 mm to 3.5 mm. 3.0 mm. When the distance between the indentations 4 is 3.9 mm or less, the number of unsealable portions increases and the ease of unsealing improves. Moreover, since the distance between the indentations is 2.0 mm or more, the raised edges are alleviated, and the film winding misalignment in the manufacturing process is suppressed.

As shown in FIGS. 7 and 8, the width c of the indentation 4 of the indentation row 5 is 0.65 mm to 3.5 mm, preferably 0.80 mm to 1.2 mm, more preferably 0.80 mm to 1.2 mm. 1.0 mm. When the width of the indentation 4 is 0.65 mm or more, the indentation can be stably applied without penetrating the film during the manufacturing process. In addition, since the width of the indentation 4 is 3.5 mm or less, the raised edge is alleviated, and the miswinding of the film during the manufacturing process is suppressed. Further, when there are a plurality of indentation rows, the interval d between the indentation rows is preferably 0.01 mm to 8.2 mm, more preferably 0.80 mm to 1.2 mm, and even more preferably 0.80 mm. ~1.0 mm.

As shown in FIGS. 7 and 8, the distance e between the indentations 4 in the indentation row 5 from the side edge 2 is preferably 0.50 mm to 2.0 mm, more preferably 0.80 mm to 1.5 mm, Even more preferably, it is between 1.0 mm and 1.5 mm. Since the distance e between the side edge 2 and the indentation 4 is 0.50 mm or more, film breakage during the manufacturing process is suppressed. In addition, since the distance e between the side edge 2 and the indentation 4 is 2.0 mm or less, the ease of opening is improved.

[Resin material]
Resin materials for forming a cylindrical stretched resin film include polyvinylidene chloride resin, polyvinyl chloride resin, polyester resin (polyethylene terephthalate, etc.), polyamide resin (nylon-6, etc.), polyolefin resin ( polyethylene, polypropylene, etc.). From the viewpoint of oxygen gas barrier properties and water vapor barrier properties, it is preferable that the cylindrical stretched resin film is made of a polyvinylidene chloride resin.

[Polyvinylidene chloride resin]
Polyvinylidene chloride resin (hereinafter sometimes referred to as "PVDC") that is preferably used as a resin material for forming a cylindrical stretched resin film may be a homopolymer of vinylidene chloride. It is a copolymer of 60 to 98% by mass of vinylidene and 2 to 40% by mass of another monomer copolymerizable with vinylidene chloride. Other monomers copolymerizable with vinylidene chloride include, for example, vinyl chloride; alkyl acrylate esters such as methyl acrylate, ethyl acrylate, butyl acrylate, and lauryl acrylate (wherein the alkyl group has 1 to 18 carbon atoms, ); methacrylic acid alkyl esters such as methyl methacrylate, butyl methacrylate, and lauryl methacrylate (alkyl group has 1 to 18 carbon atoms); vinyl cyanide such as acrylonitrile; aromatic vinyl such as styrene; carbon number such as vinyl acetate vinyl esters of aliphatic carboxylic acids of 1 to 18; alkyl vinyl ethers of 1 to 18 carbon atoms; vinyl polymerizable unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid and fumaric acid; maleic acid, fumaric acid and itaconic acid and alkyl esters of vinyl polymerizable unsaturated carboxylic acids (including partial esters, the alkyl group having 1 to 18 carbon atoms). More preferably, it is at least one selected from vinyl chloride, methyl acrylate and lauryl acrylate. Other monomers copolymerizable with vinylidene chloride may be used alone or in combination of two or more. The copolymerization ratio of other monomers is more preferably 3 to 35% by mass, still more preferably 3 to 25% by mass, and particularly preferably 4 to 22% by mass. If the copolymerization ratio of other monomers is too small, the melt processability tends to be lowered, while if the copolymerization ratio of the other monomers is too large, the oxygen gas barrier property tends to be lowered. Moreover, two or more kinds of PVDC may be mixed in order to improve melt processability.

PVDC preferably used in the present invention can be synthesized by any polymerization method such as suspension polymerization method, emulsion polymerization method and solution polymerization method. It is preferable to synthesize by a polymerization method. When synthesized by the suspension polymerization method in this way, there is a tendency not to require a pulverization step for adjusting the particle size of the powder resin made of PVDC. The particle size of such a powder resin made of PVDC is preferably in the range of 40 μm to 2 mm, more preferably in the range of 50 μm to 1 mm, and even more preferably in the range of 60 to 700 μm. The particle size of the powder resin is measured, for example, by a dry sieving method using a standard sieve.

〔Additive〕
The resin material for forming the cylindrical stretched resin film, preferably PVDC, optionally contains heat stabilizers, plasticizers, processing aids, which are added for the purpose of improving various properties and molding processability. Various additives such as colorants, ultraviolet absorbers, pH adjusters, and dispersing aids can be contained.

For example, heat stabilizers include epoxy compounds such as epoxidized vegetable oils, epoxidized animal oils, epoxidized fatty acid esters, and epoxy resin prepolymers; epoxy group-containing resins, etc., preferably epoxidized vegetable oils. When a heat stabilizer is used, the content is preferably in the range of 0.05 to 6 parts by mass, and in the range of 0.08 to 5 parts by mass, relative to 100 parts by mass of the resin material, preferably PVDC. is more preferable, and the range of 0.1 to 4 parts by mass is particularly preferable. When the content of the heat stabilizer is 0.05 parts by mass or more, the heat stability can be sufficiently improved, the molding process becomes easy, and the blackening hardly occurs. On the other hand, when the content of the heat stabilizer is 6 parts by mass or less, the oxygen gas barrier properties and cold resistance of the tubular stretched resin film are less likely to deteriorate, and bleeding and fish eyes are less likely to occur. The types and amounts of other additives can also be selected in the same manner as in the various additives used in conventional stretched resin films provided in filling packages. These additives may be used singly or in combination of two or more. These additives may be used in part or all in the monomer composition during the polymerization process of the resin material such as PVDC, or may be blended in the resin material such as PVDC after polymerization. may

[Other resins]
Furthermore, for the purpose of improving various properties and moldability, polyethylene wax, oxidized polyethylene wax, polyethylene (low-density polyethylene or high-density polyethylene), ethylene-vinyl acetate copolymer, acrylic acid ester homopolymer or copolymer, methacrylic acid ester homopolymer or copolymer, methyl methacrylate-butadiene-styrene copolymer, etc. can contain other resins. Acrylic acid esters or methacrylic acid esters are preferably C 1-18 alkyl esters of alkyl groups. When using other resins, the content is preferably 20 parts by mass or less, more preferably 16 parts by mass or less, and 10 parts by mass or less with respect to 100 parts by mass of the resin material, preferably PVDC. more preferably 5 parts by mass or less.

The properties, shape, and size of other resins can be appropriately selected as desired, taking into consideration the uniform dispersibility with the resin material forming the tubular stretched resin film. For example, it may be in a solid form such as granules, powder or pellets, or it may be in a liquid or molten state. If desired, the surface of other resins may be surface-treated.

[Size and thickness of cylindrical stretched resin film]
The size and thickness of the cylindrical stretched resin film are determined according to the size of the contents to be filled. The circumferential length of the cylindrical stretched resin film is, for example, 15 to 400 mm, often 30 to 300 mm, and widely adopted is in the range of 40 to 200 mm. The length is, for example, in the range 50-400 mm, often 70-300 mm, widely adopted range of 80-250 mm. In addition, the thickness of the cylindrical stretched resin film is determined in consideration of the strength of the film, oxygen gas barrier properties, etc., depending on the contents to be filled. Widely adopted is the range of 20-150 μm.

A laminated film can be used to increase the strength of a cylindrical stretched resin film, improve oxygen gas barrier properties, improve heat resistance, adjust shrinkage, etc. For example, a laminated film of a PVDC film and another resin stretched film such as polyethylene terephthalate film or polypropylene film can be used. Further, the cylindrical stretched resin film may be printed.

The tubular stretched resin film includes a non-adhesive film that does not adhere to the content filled in the tubular stretched resin film, and an adhesive film that adheres to the content filled in the tubular stretched resin film. Any of the tubular stretched resin films provided in the filling package can be used. Since there is no air inside due to the close contact with the content to be filled, from the viewpoint of preventing spoilage, a cylindrical stretched resin film that is an adhesive film is often preferable, but a cylindrical stretched resin film If the adhesive force between the film and the content is too large, the stretched resin film may be difficult to separate from the content such as processed food, making it difficult to take out the content.

[Production of cylindrical stretched resin film]
The tubular stretched resin film in the present invention can be obtained by a method conventionally employed as a method for producing a tubular stretched resin film to be provided in a filling package. Specifically, a strip of stretched resin film is rolled into a tubular shape so that both side edges extending in the longitudinal direction are overlapped to form a tubular film, and then the both side edges of the tubular film are longitudinally sealed. Thereby, a tubular stretched resin film can be formed.

[Production of strip-shaped stretched resin film]
The strip-shaped stretched resin film for forming the cylindrical stretched resin film is not particularly limited in its manufacturing method. For example, by extrusion molding, after forming a sheet-like or tubular extruded film and imparting heat shrinkability by stretching, in the case of a tubular extruded film, the inner sides are overlapped to form a two-ply having a predetermined width. A strip-shaped stretched resin film can be obtained, and by cutting in the longitudinal direction as necessary, a strip-shaped stretched resin film having a desired width can be produced. When the cylindrical stretched resin film is a laminated film, a strip-shaped stretched resin film laminated by coextrusion molding or extrusion lamination may be produced, or a plurality of films may be bonded together with an adhesive such as a urethane adhesive. A band-shaped stretched resin film may be produced by adhering and laminating by bonding. When the cylindrical stretched resin film is to be printed, the obtained strip-shaped stretched resin film may be printed.

[Manufacturing of Indentation]
The method for producing the indentations imparted to the stretched resin film in the present invention is not particularly limited. For example, as shown in FIG. 9, a specific position of a stretched resin film 1 is sandwiched between a disc rotating pressing member 6 and a roll member 7, and the stretched resin film is pressed to give impressions to the film. can.

[Vertical Seal Portion Having Longitudinally Extending Outer Ear]
The tubular stretched resin film of the present invention has a longitudinal seal portion having an outer ear portion extending in the longitudinal direction. That is, the tubular stretched resin film of the present invention has a vertical seal portion extending in the longitudinal direction, and the vertical seal portion also has an outer ear portion extending in the longitudinal direction.

[Vertical seal portion extending in the longitudinal direction]
The vertical seal portion extending in the longitudinal direction provided on the tubular stretched resin film is conventionally provided for the same purpose as the vertical seal portion extending in the longitudinal direction provided on the tubular stretched resin film provided in the filling package. It is something that can be done. That is, a strip-shaped stretched resin film is rolled into a tubular shape so that both side edges extending in the longitudinal direction are overlapped to form a tubular film, and then the both side edges of the tubular film are subjected to high-frequency dielectric heating, Continuous sealing (bonding) in the longitudinal direction (longitudinal direction) according to conventional methods such as welding by ultrasonic heating, laser heating, resistance heating, etc., bonding with adhesives (including heat sealing), etc. A stretched resin film is formed. The longitudinal seal portion is provided over the entire length of the tubular stretched resin film in the longitudinal direction, so that the contents filled and enclosed in the tubular stretched resin film can be stored in a sealed state. can. The width of the vertical seal portion extending in the longitudinal direction provided on the tubular stretched resin film can be appropriately determined.

[Outer ear part extending in the longitudinal direction]
The outer ear portion extending in the same longitudinal direction, which is included in the vertical seal portion extending in the longitudinal direction provided in the tubular stretched resin film of the present invention, is the belt-shaped stretched resin film of the tubular film described above. When both side edges are continuously sealed (adhered) in the longitudinal direction (longitudinal direction) according to a conventional method, the side edge parts perpendicular to the longitudinal direction of the side edge exposed on the outer surface are not sealed. It is a non-seal portion extending in the longitudinal direction of the tubular stretched resin film. The width of the outer ear is, for example, in the range 1-15 mm, often 2-8 mm. The outer ear portion (non-sealed portion) extending in the longitudinal direction is, for example, formed with a uniform width over the entire longitudinal length of the tubular stretched resin film, but the width of the outer ear portion (non-sealed portion) may be formed differently.

[Convergence of both ends in the longitudinal direction]
The filling package of the present invention includes a longitudinal seal portion having an outer ear portion extending in the longitudinal direction, and a tubular stretched resin film having both ends in the longitudinal direction converged. That is, the filled package of the present invention is formed by bundling both ends of the tubular stretched resin film in the longitudinal direction after filling the tubular stretched resin film with contents such as processed foods. The contents can be stored in a sealed state. The bundling of both ends in the longitudinal direction of the tubular stretched resin film is conventionally performed for the tubular stretched resin film provided in the filling packaging body. A wire clip made of metal such as a wire clip or a lateral sealing film (reinforcing tape) or other means of convergence can be adopted.

[Filled package]
The filled package of the present invention comprises a tubular stretched resin film formed by stacking both side edges of the stretched resin film so that the front and back surfaces of the stretched resin film face each other, and longitudinally sealing the stretched resin film, and a content. A filled package in which both ends of the tubular stretched resin film filled with are sealed, wherein the side edges having indentation rows of the stretched resin film are filled with the tubular stretched resin film Form an outer ear part that protrudes in a belt shape on the outside of the. By pressurizing and heating sterilizing (heating) the filling package, at least a part of the indentation can become a through hole. Even if the indentation remains (without a through-hole), it can be opened. The reason why at least a part of the indentations become through-holes when the filled package is sterilized by pressurization and heat treatment (heat treatment) is not necessarily clear, but shrinkage force is generated in the stretched resin film during pressurization and heat sterilization (heat treatment). , it is thought that through-holes are formed due to stress concentration occurring in the thin portion of the indentation.

A perspective view of the filling package 11 is shown in FIG. The tubular stretched resin film is made of resin so that the side edge portion 3 having the indentation rows 5 of the stretched resin film 1 forms an outer ear portion 8 protruding in a belt shape to the outside of the stretched resin film. Both side edges of the stretched resin film are overlapped so that the front and back surfaces of the stretched resin film are opposed to each other, and are longitudinally sealed in the longitudinal direction. The filled package 11 in which the contents are sealed is subjected to pressurized heat sterilization (heat treatment). It is penetrated by pressure heat sterilization (heat treatment). Starting from such a group of through-holes, the outer ear can be easily cut with fingers.

The interval b' between the through-hole rows in the filled package after pressurized heat sterilization (heat treatment) is 1.0 mm to 2.9 mm, preferably 1.6 mm to 2.8 mm. When the interval between the through-holes is 1.0 mm or more, it is possible to prevent the through-holes from being cut and connected to each other and unintentionally cutting the through-hole portion. In addition, since the interval between the through holes is 2.9 mm or less, the ease of opening is further improved.

The width c' of the through-holes in the row of through-holes in the filled package after pressurized heat sterilization (heat treatment) is 0.30 mm to 2.7 mm, preferably 0.35 mm to 0.6 mm. When there are a plurality of rows of through holes, the interval d' between the rows of through holes is 0.01 mm to 7.6 mm, preferably 0.50 mm to 0.90 mm.

The interval e′ of the through-holes in the row of through-holes from the side end of the outer ear portion in the filled package after pressurized heat sterilization (heat treatment) is 0.20 mm to 1.5 mm, preferably 0.40 mm to 1.0 mm. is. When the distance from the side end of the outer ear portion to the through-holes of the through-hole row is within the above range, the ease of opening can be further improved, and unintended cutting can be suppressed.

The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited to these examples. The properties of the filled package of the present invention were measured by the following methods.

[Manufacturing suitability: film winding misalignment in the manufacturing process]
A roll was prepared by winding a film with an indentation on one side edge of the stretched resin film for 1500 m, and a roll was evaluated as having no problem in production aptitude if there was no winding misalignment ("○" in the table). ). Films in which winding misalignment occurred were evaluated as having problems in manufacturing aptitude (indicated by "x" in the table).

[Indentation state]
One meter of the film was pulled out from the roll of the film, and it was visually confirmed whether an indentation was given to one side of the side edge of the film. If impressions were given to the side edges of the film, it was evaluated that there was no problem with the impressions (indicated by "◯" in the table). If the side edge of the film had a through hole, it was evaluated as having a problem with the indentation (indicated by "X" in the table).

[Heat shrinkage rate]
The heat shrinkage rate of the stretched resin film is obtained by immersing a stretched resin film of 100 mm square in 100° C. hot water for 3 minutes, taking it out, cooling it to room temperature, and measuring the dimensions of the shrunk film sample. It was calculated from the following formula.
・Thermal shrinkage rate of MD (%)
(100-MD length of film after shrinkage (mm))/100×100
・Thermal shrinkage rate of TD (%)
(100-length of TD of film after shrinkage (mm))/100×100

[Retort (pressurized heat sterilization) resistance]
The retort resistance of the filled package of the present invention was evaluated according to the following method. That is, using an RCS-type retort sterilizer FlavorAce-60/10TG manufactured by Hisaka Seisakusho Co., Ltd., 10 filled packages were placed in a retort oven at a temperature of 120° C. and a pressure of 2.0 kg/cm ² (gauge pressure). After leaving it at rest for 10 minutes, it was taken out, and the number (number of punctures) of which the longitudinal seal part was peeled off or the longitudinal seal part was cracked was visually counted. When the number of punctures was 0, the filled package was evaluated as having retort resistance (indicated by "◯" in the table). When the number of punctures was one or more, the filled package was evaluated as having no retort resistance (indicated by "X" in the table).

[Through-hole condition]
Among the filled packages after the retort treatment, 5 samples were sampled from which puncture did not occur. The number of samples having through-holes in the outer ear portion of the obtained samples was visually counted. If a through-hole was provided in the outer ear, it was evaluated that there was no problem with the through-hole state. (Indicated as "〇" in the table). If there was no through-hole in the outer ear and there was an indentation, it was evaluated that there was a problem with the through-hole state (indicated by "×" in the table).

[Ease of opening]
Among the sealed packages after the retort treatment, one sample was randomly sampled from those in which puncture did not occur. If the obtained sample could be opened by picking up the outer ear, it was evaluated as having good easy-openability (indicated by "◯" in the table). If the outer ear portion could not be pinched and opened, the ease of opening was evaluated as poor (indicated by "x" in the table).

[Example 1]
PVDC (vinylidene chloride-vinyl chloride copolymer manufactured by Kureha Co., Ltd. It was prepared so that the content of structural units derived from vinylidene chloride was 89% by mass and the content of structural units derived from vinyl chloride was 11% by mass. ) is melted and extruded from a circular die to produce a circular film, and at a stretching temperature of 28 ° C., the MD (longitudinal direction) is 2.4 times and the TD (transverse direction) is 4.0 times inflation biaxial stretching. Then, the insides of the annular films were overlapped to obtain a strip-shaped PVDC stretched film having a thickness of 40 μm (thickness of two films having a thickness of 20 μm). The obtained stretched PVDC film had a heat shrinkage rate of MD 22.4% and TD 19.9%. After that, the strip-shaped film was cut to obtain a strip-shaped original film having indentations as shown in FIG. The indentation depth a is 25% (10 μm) of the total film thickness, the indentation interval b is 3.0 mm, the indentation width c is 0.8 mm, the indentation row interval d is 1.0 mm, and the film side The interval e between the indentations from the edge was 1.5 mm, and the number of rows of indentations was two (a, b, and c in the two rows were the same, and the interval f in the longitudinal direction between adjacent rows of indentations was 1.5 mm). After that, the strip-shaped PVDC film is rolled into a tubular shape so that both side edges extending in the longitudinal direction are overlapped to form a tubular film, and the overlapping both side edges of the tubular film are applied to a predetermined voltage and current. The outer ear with a width of 8 mm extending in the longitudinal direction is vertically sealed by passing between the sealing electrode and the ground electrode of the high frequency dielectric heating device to which the high frequency power is applied. A tubular PVDC film having a longitudinal seal portion with a portion was formed. Subsequently, the cylindrical PVDC film was filled with surimi for fish sausage (52% fish surimi, 23% water, 13% starch, 10% lard, 2% salt) from a filling device. A filled package having a circumference of 42 mm and a length between clips of 170 mm was produced by bundling both longitudinal ends of a cylindrical PVDC film with aluminum wire clips and cutting the film. 20 g of minced fish sausage was filled and sealed in each of the filling packages. Table 1 shows evaluation results of various performance evaluations before retort, and Table 2 shows evaluation results of various performance evaluations after retort (pressurized heat sterilization).

As shown in Tables 1 and 2, the resin-made stretched film according to the present invention can suppress the winding deviation of the film in the manufacturing process even if it has an indentation, and the manufacturing process of the filled package , it was confirmed that film breakage is less likely to occur. Similarly, it was confirmed that the stretched resin film according to the present invention provides a filled package that can be easily opened from the outer ear portion after being sterilized under pressure and heat (heat treatment).

1: stretched resin film, 2: side edge, 3: side edge, 4: indentation, 5: row of indentation, 6: disc rotary pressing body, 7: roll member, 8: outer ear, 9: through hole, 10: row of through-holes, 11: filling package

Claims

A stretched resin film having indentations,
The indentation does not penetrate the stretched resin film,
The stretched resin film has an indentation row in which the indentations are arranged in the longitudinal direction of the stretched resin film at a side edge of 0.50 mm to 15 mm from the side edge of the stretched resin film,
The distance between the indentations in the longitudinal direction is 2.0 mm to 3.9 mm,
The stretched resin film, wherein the width of the indentation in the transverse direction of the stretched resin film is 0.65 mm to 3.5 mm.
The stretched resin film according to claim 1, wherein the number of indentation rows is 1 to 20 rows.
The stretched resin film according to claim 1 or 2, which contains a vinylidene chloride resin.
Both side edges of the stretched resin film according to any one of claims 1 to 3 are overlapped so that the front and back surfaces of the stretched resin film face each other, and are longitudinally sealed in the longitudinal direction to form a tubular shape. A filled package in which a content is filled in a stretched resin film and both ends are sealed, wherein a side edge portion having an indentation row of the stretched resin film is outside the tubular stretched resin film. A filling package that forms an outer ear part protruding in a strip shape.
The filled package according to claim 4, which is heat-treated.
The filling package according to claim 5, which has a through hole instead of at least part of the indentation.
The outer ear portion has a through-hole row in which the through-holes are aligned in the longitudinal direction of the outer ear portion at a side edge portion of 0.20 mm to 8.0 mm from the side end of the outer ear portion, and the longitudinal direction of the through-hole is 7. The filling package according to claim 6, wherein the directional interval is 1.0 mm to 2.9 mm, and the width of the through hole in the lateral direction of the outer ear portion is 0.30 mm to 2.7 mm.