KR20230125294A - Stretched resin film and filled package using the same - Google Patents

Abstract

First, even if it has an indentation, it is possible to suppress the winding deviation of the film in the manufacturing process thereof, secondly, it is difficult to cause a film short circuit in the manufacturing process of the filled package body, and thirdly, after pressurized heat sterilization (heat treatment) A resin-made stretched film providing a filled package that can be easily opened from the outer ear portion and a filled package using the same are provided. 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 has the above-mentioned lateral edge portion of 0.50 mm to 15 mm from the side edge of the stretched resin film. the indentation has rows of indentations parallel to the longitudinal direction of the stretched resin film, the interval between the indentations in the longitudinal direction is 2.0 mm to 3.9 mm, and the width of the indentation in the transverse direction of the stretched resin film is 0.65 mm; -3.5 mm.

Description

Stretched resin film and filled package using the same

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

A packed package filled with contents such as solid or pasty processed foods such as sausage, cheese, hamburger, Uiro (confectionery), etc., has both edges extending in the longitudinal direction of the usually strip-shaped resin film in the longitudinal direction. The inside of a cylindrical resin film having a longitudinal sealing portion extending in the longitudinal direction, which is formed by sealing, is filled with contents such as the processed food described above, and both ends in the longitudinal direction of the cylindrical resin film, It has a structure that is bundled and sealed by a metal wire clip such as an aluminum wire clip or a transverse sealing film (reinforcing tape) or other means. As the resin forming the cylindrical resin film provided in the filled package body, polyolefin-based resin (polyethylene, polypropylene, etc.), polyamide-based resin (nylon-6, etc.), polyester-based resin (polyethylene terephthalate, etc.) , polyvinyl chloride-based resins, polyvinylidene chloride-based resins, etc. are used, and polyvinylidene chloride-based resins are preferably used from the viewpoint of excellent oxygen gas barrier properties and heat resistance and strength balance.

In order to peel off the cylindrical resin film from these filled packaging bodies and take out the contents, such as processed food, the converged parts of both ends in the longitudinal direction of the cylindrical resin film are cut and removed, or the cylindrical resin film is removed. For example, it is necessary to expose the content by cutting along the longitudinally sealed portion of both edges extending in the longitudinal direction or in a direction orthogonal to the longitudinally sealed portion. However, a cylindrical resin film, for example, a cylindrical resin film formed of a polyvinylidene chloride-based resin, cannot be opened with only the force of a finger when a consumer takes out the contents because the film is tough. There are cases. In this case, there has been a problem that cutting tools such as scissors or knives must be prepared and cut, or even if cutting tools are used, the contents may not be properly exposed.

The object is to provide a filled package having easy opening and easy extraction of the contents from the filled package, for example, in Patent Document 1, both side edges of the heat-shrinkable film are mutually opposed to each other so that the front and back surfaces of the heat-shrinkable film face each other. A cylindrical film overlapped and sealed in the longitudinal direction, and a sealing member for sealing both ends of the cylindrical film filled with a content, wherein a side edge of the heat-shrinkable film having scars is formed on the surface of the cylindrical film. Disclosed is a sealed package body in which an outer ear protrudes in a belt shape on the outside, and the distance between the scars of the side edges after heat treatment in the longitudinal direction is 3.0 mm to 28 mm.

Patent Document 1: Japanese Unexamined Patent Publication No. 2020-37431

However, in the method described in Patent Literature 1, since scars penetrate the film, film dust is generated during production, and there is a risk of mixing of film dust in the filled package body. Cracks may occur at the scar due to the applied tension, resulting in a film short circuit. In addition, the distance between the scars in the longitudinal direction is long, and it is difficult to say that the ease of opening is sufficiently achieved.

As one of the means to solve this problem, it is considered to provide indentations at short intervals in the longitudinal direction on the outer ear portion of the filled package body. Such a filled package body having an indentation on the outer ear portion is manufactured using a film master having an indentation on the side edge portion. Specifically, a film is supplied from a roll-shaped film master, and both side edges are overlapped and longitudinally sealed to form a cylindrical shape, and cut to an appropriate length as necessary. However, simply by providing indentation, the side edge side having indentation among the rolls of the original film is rough (the end is thicker than the central part in the axial direction of the roll), and the winding deviation of the film (film roll When the roll is wound into a shape and unrolled, the cross section of the roll becomes uneven), so it becomes difficult to send out the film evenly, and the film cannot be formed into a cylindrical shape. In addition, only providing an indentation to the outer ear portion of the filled package body facilitates opening, but is not necessarily sufficient.

The present invention has been made in view of the above problems, firstly, even if there is an indentation, the winding deviation of the film can be suppressed in the manufacturing process thereof, and secondly, in the manufacturing process of the filled package body, it is difficult to cause a film short circuit, A third object is to provide a resin-made stretched film that provides a filled package that can be easily opened from the outer ear after sterilization (heat treatment) under pressure and heat, and a filled package using the same.

The inventors of the present invention are a resin-made stretched film having indentations, wherein the indentations do not penetrate the resin-made stretched film, and the resin-made stretched film has rows of indentations parallel to each other at predetermined positions at predetermined intervals and at predetermined widths. With the first stretched film, it was found that the above problems could be solved, and the present invention was completed.

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 has a side edge of 0.50 mm to 15 mm from the side edge of the stretched resin film. The indentation has rows of indentations parallel to the longitudinal direction of the stretched resin film, the distance between the indentations in the longitudinal direction is 2.0 mm to 3.9 mm, and the width of the indentation in the transverse direction of the stretched resin film is 0.65. It is mm - 3.5 mm.

In the above resin-made stretched film, it is preferable that the number of indentation rows is 1 row to 20 rows.

The stretched resin film preferably contains a vinylidene chloride-based resin.

The packed package according to the present invention is made of cylindrical resin in which both edges of the stretched resin film according to the present invention overlap each other so that the front and back surfaces of the stretched resin film face each other and are sealed in the longitudinal direction in the longitudinal direction. A packed package body in which a content is filled in a stretched film and both ends are sealed, wherein a side edge having an indentation row of the stretched resin film forms an outer shell protruding in a belt shape from the outside of the stretched cylindrical resin film.

Preferably, the filled package body is heat treated.

It is preferable that the filled package body has a through hole in place of at least a part of the indentation.

In the above-mentioned filled package, the outer ear portion has a row of through holes in which the through holes are aligned in the longitudinal direction of the outer ear portion at a side edge of 0.20 mm to 8.0 mm from the side end of the outer ear portion, and the spacing of the through holes in the longitudinal direction is is 1.0 mm to 2.9 mm, and the width of the through hole in the transverse direction of the outer ear portion is preferably 0.30 mm to 2.7 mm.

According to the present invention, the above problems can be solved. That is, even if the resin-made stretched film according to the present invention has indentations, it is possible to suppress the winding deviation of the film in its manufacturing process, and it is difficult to cause a film short circuit in the manufacturing process of the filled package body. In addition, the resin-made stretched film according to the present invention provides a filled package that can be easily opened from the outer ear after sterilization (heat treatment) by heating under pressure.

1 shows a perspective view of a stretched resin film of the present embodiment.
Fig. 2 shows a cross-sectional view of an indentation in the stretched resin film of the present embodiment.
Fig. 3 shows a front view of an indentation in the stretched resin film of the present embodiment.
4 shows another aspect of the front view of the indentation of the resin-made stretched film of this embodiment.
5 shows another aspect of the front view of the indentation of the resin-made stretched film of this embodiment.
6 shows another aspect of the front view of the indentation of the resin-made stretched film of this embodiment.
Fig. 7 shows one aspect of indentation heat in the stretched resin film of the present embodiment.
Fig. 8 shows another aspect of the indentation heat of the stretched resin film of the present embodiment.
Fig. 9 shows an example of the indentation imparting method of the present embodiment.
Fig. 10 shows one aspect of the filled package body of this embodiment.

Hereinafter, the 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 within a range not departing from the gist thereof.

[Cylindrical resin-made stretched film]

A filled package of the present invention is a filled package comprising a cylindrical stretched resin film and a content, wherein the cylindrical stretched resin film has a longitudinal sealing portion having an outer ear portion extending in the longitudinal direction, and Both ends of are concentrated.

The stretched resin film according to the present invention is a stretched resin film having indentations (marks possible when pushed or applied with pressure), the indentations do not penetrate the stretched resin film, and the stretched resin film has At a side edge portion of 0.50 mm to 15 mm from the side edge of the stretched resin film, the indentation has rows of indentations parallel to 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 indentation in the transverse direction of the resin-made stretched film is 0.65 mm to 3.5 mm.

As a resin-made stretched film forming a cylindrically-shaped stretched resin film, conventionally, a cylindrical shape provided in a filled package that is filled with contents such as sausage, processed cheese, ham, and processed foods such as hamburgers and sealed, and individually wrapped in a hermetically sealed shape. A stretched resin film used to form a shaped stretched resin film can be used.

[Heat contraction rate]

The resin-made stretched film of the present invention preferably has heat shrinkability, and the MD (longitudinal direction of the film) heat shrinkage at 100°C is preferably 19% to 35%, more preferably 19% to 25%. . Further, the TD (transverse direction of the film) thermal shrinkage at 100°C is preferably 19% to 30%, more preferably 19% to 25%. By setting the heat shrinkage rates of MD and TD at 100°C to 19% or more, through holes are easily formed after heat treatment of the filled package body. 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 body can be suppressed after heat treatment of the filled package body.

[Indentation]

The indentation of the stretched resin film of the present embodiment will be described using FIG. 1, which is a perspective view of the stretched resin film, and FIGS. 2 to 8 showing the mode of indentation. As shown in FIG. 1 , the stretched resin film 1 of this embodiment has an indentation 4 in at least a part of the side edge portion 3 that is a region of 0.50 mm to 15 mm from the side end 2. Here, it is not necessary that all the side edges have the indentation 4, and as a preferable aspect, one 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 resin-made stretched film 1 is the total film thickness before indentation (in the case of two-layer lamination, the thickness of the two layers laminated), Preferably they are 10% - 90%, More preferably, they are 20% - 60%. By setting the depth a of the indentation 4 to 10% or more of the total film thickness before indentation, unsealing becomes easy, and by setting it to 90% or less, film short circuit in the manufacturing process is suppressed. In addition, the shape of the indentation 4 is not specifically limited, As shown in FIGS. 3-6, a square, an ellipse, a broken line, a triangle, etc. can be illustrated.

The indentations 4 form indentation rows 5 side by side in the longitudinal direction (MD in FIG. 1). The number of indentation rows is preferably 1 to 20 rows, more preferably 1 to 3 rows, and still more preferably 2 rows. 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. , the spacing of the indentations 4 of the indentation rows 5 may be the same or different between the rows. Further, the intervals of the indentations 4 in the same row may be equal or uneven as long as they satisfy a predetermined range (2.0 mm to 3.9 mm).

As shown in Figs. 7 and 8, the spacing b of the indentation 4 of the indentation row 5 is 2.0 mm to 3.9 mm, preferably 2.5 mm to 3.5 mm, more preferably 2.5 mm to 3.9 mm. 3.0 mm. When the interval between the indentations 4 is 3.9 mm or less, the number of opening locations is increased and the ease of opening is improved. In addition, when the interval between the indentations is 2.0 mm or more, a raised edge is alleviated and the film winding deviation in the manufacturing process is suppressed.

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 3.5 mm. It is 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 in the manufacturing process. Moreover, when the width of the indentation 4 is 3.5 mm or less, noise in the ears is alleviated, and film winding shift in the manufacturing process is suppressed. Further, when there are a plurality of rows of indentations, the interval d between the rows of indentations is preferably 0.01 mm to 8.2 mm, more preferably 0.80 mm to 1.2 mm, and still more preferably 0.80 mm to 1.0 mm. mm.

As shown in Figs. 7 and 8, the distance e of the indentation 4 of the indentation row 5 from the side end 2 is preferably 0.50 mm to 2.0 mm, more preferably 0.80 mm to 1.5 mm. , and more preferably 1.0 mm to 1.5 mm. When the space|interval e of the indentation 4 from the side end 2 is 0.50 mm or more, the film short circuit in a manufacturing process is suppressed. Further, when the distance e between the indentations 4 from the side end 2 is 2.0 mm or less, the ease of opening is improved.

[Resin material]

Examples of the resin material for forming the cylindrical stretched resin film include polyvinylidene chloride-based resin, polyvinyl chloride-based resin, polyester-based resin (such as polyethylene terephthalate), polyamide-based resin (such as nylon-6), and polyolefin. system resin (polyethylene, polypropylene, etc.); etc. are mentioned. From the standpoint of oxygen gas barrier properties and water vapor barrier properties, the cylindrical resin-made stretched film is preferably formed of a polyvinylidene chloride-based resin.

[Polyvinylidene chloride-based resin]

The polyvinylidene chloride-based resin (hereinafter sometimes referred to as "PVDC") preferably used as a resin material for forming a cylindrical stretched resin film may be a homopolymer of vinylidene chloride, but is usually vinylidene chloride 60 It is a copolymer of -98% by mass and 2-40% by mass of another monomer copolymerizable with vinylidene chloride. Examples of other monomers copolymerizable with vinylidene chloride include vinyl chloride; acrylic acid alkyl esters (alkyl group having 1 to 18 carbon atoms) such as methyl acrylate, ethyl acrylate, butyl acrylate, and lauryl acrylate; methacrylic acid alkyl esters (alkyl group having 1 to 18 carbon atoms) such as methyl methacrylate, butyl methacrylate, and lauryl methacrylate; vinyl cyanide such as acrylonitrile; Aromatic vinyls, such as styrene; vinyl esters of aliphatic carboxylic acids having 1 to 18 carbon atoms such as vinyl acetate; alkyl vinyl ethers having 1 to 18 carbon atoms; vinyl polymerizable unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, and fumaric acid; and alkyl esters of vinyl polymerizable unsaturated carboxylic acids such as maleic acid, fumaric acid and itaconic acid (including partial esters, having 1 to 18 carbon atoms in the alkyl group). More preferably, it is at least 1 sort(s) chosen from vinyl chloride, methyl acrylate, and lauryl acrylate. The other monomer copolymerizable with vinylidene chloride may be used individually by 1 type, or may be used in combination of 2 or more type. The copolymerization ratio of the other monomers is more preferably in the range of 3 to 35% by mass, still more preferably 3 to 25% by mass, and particularly preferably 4 to 22% by mass. When the copolymerization ratio of the other monomers is too small, the melt processability tends to decrease, and on the other hand, when the copolymerization ratio of the other monomers is too large, the oxygen gas barrier property tends to decrease. In addition, two or more types of PVDC may be mixed in order to improve melt processability.

The PVDC preferably used in the present invention can be synthesized by any polymerization method such as suspension polymerization, emulsion polymerization, and solution polymerization, but when forming a compound as a powdered resin, it is synthesized by the suspension polymerization method. it is desirable When synthesized by the suspension polymerization method in this way, there is a tendency that a pulverization step for adjusting the particle size of the powdery resin made of PVDC is not required. The particle size of the powdery resin made of such PVDC is preferably in the range of 40 μm to 2 mm, more preferably in the range of 50 μm to 1 mm, and still more preferably in the range of 60 to 700 μm. In addition, the particle size of the powdery resin is measured by, for example, a dry sieve screening method using a standard sieve.

〔additive〕

A heat stabilizer, a plasticizer, a processing aid, a colorant, an ultraviolet absorber, and a pH adjuster added to the resin material forming the cylindrical stretched resin film, preferably PVDC, for the purpose of improving various properties and molding processability as needed. , various additives such as dispersing aids can be contained.

For example, examples of the heat stabilizer include epoxy compounds such as epoxidized vegetable oil, epoxidized animal oil, epoxidized fatty acid ester, and epoxy resin prepolymer; Epoxy group-containing resin etc. are mentioned, Preferably it is an epoxidized vegetable oil. The content of the heat stabilizer is preferably in the range of 0.05 to 6 parts by mass, more preferably in the range of 0.08 to 5 parts by mass, and preferably 0.1 to 4 parts by mass, based on 100 parts by mass of the resin material, preferably PVDC. range is particularly preferred. If the content of the thermal stabilizer is 0.05 part by mass or more, the thermal stability is sufficiently improved, the molding process becomes easy, and the blackening is difficult. On the other hand, if the content of the heat stabilizer is 6 parts by mass or less, the oxygen gas barrier properties and cold resistance of the cylindrically shaped stretched resin film are less likely to deteriorate, and bleed and fish eyes are less likely to occur. The type and amount of other additives can also be selected in the same manner as in the various additives used in the cylindrical resin-made stretched film provided in the conventional filled package body. These additives may be used individually by 1 type, or may be used in combination of 2 or more type. In addition, some or all of these additives may be incorporated into the monomer composition in the step of polymerization of a resin material such as PVDC, or may be incorporated into a resin material such as PVDC after polymerization.

[other resins]

In addition, the resin material for forming the cylindrical stretched resin film, preferably PVDC, may be, if necessary, polyethylene wax, oxidized polyethylene wax, polyethylene (low-density polyethylene or high-density polyethylene) for the purpose of improving various properties and molding processability. polyethylene), an ethylene-vinyl acetate copolymer, a homopolymer or copolymer of acrylic acid ester, a homopolymer or copolymer of methacrylic acid ester, and a methyl methacrylate-butadiene-styrene copolymer. It is preferable that acrylic acid ester or methacrylic acid ester is a C1-C18 alkyl ester of an alkyl group. In the case of using another resin, the content is preferably 20 parts by mass or less, more preferably 16 parts by mass or less, still more preferably 10 parts by mass or less, and 5 parts by mass relative to the resin material, preferably 100 parts by mass of PVDC. Part or less is particularly preferred.

The properties, shapes and sizes of other resins can be appropriately selected as desired in consideration of uniform dispersibility with the resin material forming the cylindrically shaped stretched resin film. For example, it may be solid, such as granular, powdery, or pelleted, or may be liquid or molten. Moreover, what surface-treated the surface of another resin may be sufficient as desired.

[Size and thickness of cylindrical resin-made stretched film]

The size and thickness of the cylindrical resin-made stretched 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, in many cases 30 to 300 mm, and the range widely employed is 40 to 200 mm, and in the longitudinal direction of the cylindrical stretched resin film The length is in the range of, for example, 50 to 400 mm, 70 to 300 mm in many cases, and 80 to 250 mm that are widely employed. In addition, the thickness of the cylindrical resin-made stretched film is determined in consideration of the strength and oxygen gas barrier properties of the film according to the contents to be filled, but, for example, 15 to 300 μm, in many cases 18 to 200 μm, is widely adopted. It is in the range of 20 to 150 μm.

A laminated film can be used for increasing the strength of a cylindrically shaped stretched resin film, improving oxygen gas barrier properties, improving heat resistance, adjusting shrinkage properties, and the like. For example, a laminated film of a PVDC film and another stretched resin film such as a polyethylene terephthalate film or a polypropylene film can be used. In addition, the cylindrical resin-made stretched film may be printed.

Further, as the cylindrical stretched resin film, there are a non-adhesive film that does not adhere to the contents to be filled in the cylindrical resin-made stretched film and an adherent film that adheres to the contents to be filled. In the resin-made stretched film of the cylindrical shape provided, all can be used. Since air does not exist inside by being in close contact with the contents to be filled, from the viewpoint of preventing spoilage, a cylindrical stretched resin film as an adhesion film is often preferable, but the adhesion between the cylindrical stretched resin film and the contents is high. If it is too large, the stretched resin film may be difficult to separate from the contents of processed food or the like, and it may be difficult to take out the contents.

[Manufacture of cylindrical resin-made stretched film]

The cylindrical stretched resin film in the present invention can be obtained by a method conventionally employed as a method for producing a cylindrical stretched resin film provided in a packed package. Specifically, a strip-shaped stretched resin film is wound into a cylindrical shape so that both edges extending in the longitudinal direction overlap to form a cylindrical film, and then, by sealing the both edge portions of the cylindrical film in the longitudinal direction, A shaped resin-made stretched film can be formed.

[Manufacture of strip-shaped stretched resin film]

The manufacturing method of the belt-shaped stretched resin film for forming the cylindrical stretched resin film is not particularly limited. For example, after forming a sheet-like or tubular extruded film by extrusion molding and stretching it to impart heat shrinkability, in the case of a tubular extruded film, the inner sides are overlapped to form a double-layered band having a predetermined width. A stretched resin film can be obtained, and a strip-shaped stretched resin film having a desired width can be produced by cutting in the longitudinal direction as necessary.

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, and a plurality of films are bonded with an adhesive, for example, a urethane-based adhesive. You may manufacture the strip-shaped stretched resin film laminated|stacked by making it. When the cylindrical stretched resin film is to be printed, the obtained strip-shaped stretched resin film may be printed.

[Manufacture of indentation]

The manufacturing method of the indentation provided to the resin-made stretched film in this invention is not specifically limited. For example, as shown in FIG. 9 , a specific position of the stretched resin film 1 is clamped by the disc rotation pressing body 6 and the roll member 7 to press the stretched resin film, thereby imparting an indentation to the film. can do.

[Longitudinal seal having an outer ear portion extending in the longitudinal direction]

The cylindrically shaped resin-made stretched film of the present invention is provided with a longitudinal sealing portion having an outer ear portion extending in the longitudinal direction. That is, the cylindrical stretched resin film in the present invention has a longitudinal sealing portion extending in the longitudinal direction, and the longitudinal sealing portion has an outer ear portion similarly extending in the longitudinal direction.

[Longitudinal sealing portion extending in the longitudinal direction]

The longitudinal sealing portion extending in the longitudinal direction provided on the cylindrical stretched resin film has the same effect as the longitudinal sealing portion extending in the longitudinal direction provided on the cylindrical stretched resin film provided in the conventional packed package. will be provided with That is, a strip-shaped resin-made stretched film is wound into a cylindrical shape so that both side edges extending in the longitudinal direction overlap to form a cylindrical film, and then, the above-mentioned both side edges of the cylindrical film are heated by high-frequency dielectric heating or ultrasonic heating. , sealing (bonding) continuously in the longitudinal direction (longitudinal direction) according to conventional methods such as welding by laser heating, resistance heating, etc., bonding with an adhesive (including heat sealing), and then stretching the resin into a cylindrical shape. film is formed. The longitudinal sealing portion is provided over the entire length of the cylindrical stretched resin film, whereby the contents filled and sealed in the cylindrical stretched resin film can be stored in a sealed state. The width of the longitudinal sealing portion extending in the longitudinal direction provided on the cylindrical stretched resin film can be appropriately determined.

[Outer ear part extending in the longitudinal direction]

The belt-shaped resin of the above-described cylindrical film is different from the outer ear portion extending in the longitudinal direction in the same way that the longitudinally extending sealing portion provided in the cylindrical resin-made stretched film in the present invention has. When the both edge portions of the first stretched film are continuously sealed (bonded) in the longitudinal direction (longitudinal direction) according to a conventional method, the side end portion orthogonal to the longitudinal direction of the side edge exposed on the outer surface is not sealed. It is an unsealed portion extending in the longitudinal direction of the cylindrical resin-made stretched film formed by the above. The width of the outer ear portion is, for example, 1 to 15 mm, and in many cases is within the range of 2 to 8 mm. In addition, the outer ear portion (non-sealing portion) extending in the longitudinal direction is formed with a uniform width over the entire length of the cylindrical resin-made stretched film, for example, but the width of the outer ear portion (non-sealing portion) is different. can form

[Convergence of both ends in the longitudinal direction]

The filled package body of the present invention includes a cylindrical resin-made stretched film having a longitudinal sealing portion having an outer ear portion extending in the longitudinal direction and converging both ends in the longitudinal direction. That is, the filled package of the present invention is formed by filling a cylindrical stretched resin film with contents such as processed food, and then converging both ends of the cylindrical stretched resin film in the longitudinal direction to seal the contents. can be preserved The bundling of both ends of the cylindrical stretched resin film in the longitudinal direction is a conventional method of bundling the ends in the longitudinal direction of the stretched cylindrical resin film provided in the packed package, for example, an aluminum wire clip or the like. A convergence method using a metal wire clip or transverse sealing film (reinforcing tape) or other means can be employed.

[Filled packaging]

The packed package of the present invention includes a cylindrical stretched resin film in which both edges of a stretched resin film are overlapped so that the front and back surfaces of the stretched resin film face each other and sealed in the longitudinal direction in the longitudinal direction; A filled package body in which both ends of a cylindrical stretched resin film are sealed, wherein a side edge having an indentation row of the stretched resin film forms an outer shell protruding in a band shape outside the stretched cylindrical resin film. Then, by pressurizing and heating sterilization (heat treatment) of the filled package body, at least a part of the indentation can become a through hole. Although it has openability even in an indented state (even when it is not a through hole), the openability is further improved by becoming a through hole. The reason why at least a part of the indentation becomes a through hole by pressurizing and heating sterilization (heat treatment) of the filled package body is not necessarily clear, but at the time of pressurization and heating sterilization (heat treatment), shrinkage force is generated in the stretched resin film, and the thickness of the indentation is reduced. It is thought that the through hole is formed by stress concentration in the thin part.

Fig. 10 shows a perspective view of the filled package body 11. In the cylindrical stretched resin film, a side edge portion 3 having an indentation row 5 of the stretched resin film 1 has an outer ear portion 8 protruding outside the cylindrical stretched resin film in a band shape. In order to form a 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 face each other, and the longitudinal direction is sealed in the longitudinal direction. The filled package 11 in which the contents are sealed is sterilized by heating under pressure (heat treatment). It penetrated by sterilization (heat treatment). Using this group of through holes as a starting point, the outer ear portion can be easily cut with a finger.

The distance b' between the through holes in the rows of through holes in the packed package after sterilization by heat treatment (heat treatment) is 1.0 mm to 2.9 mm, preferably 1.6 mm to 2.8 mm. When the through-holes have an interval of 1.0 mm or more, the through-holes are cut and connected to each other, and unintentional cutting from the through-hole portion can be suppressed. In addition, when the spacing of the through holes is 2.9 mm or less, the ease of opening is further improved.

The width (c') of the through holes of the row of through holes in the packed package after the pressure heat sterilization (heat treatment) is 0.30 mm to 2.7 mm, preferably 0.35 mm to 0.6 mm. Further, when there is a plurality of rows of through holes, the distance d' between the rows of through holes is 0.01 mm to 7.6 mm, preferably 0.50 mm to 0.90 mm.

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

Example

Examples and comparative examples are shown below to further explain the present invention, but the present invention is not limited to these examples. The characteristics of the filled package body of the present invention were measured by the following method.

[Manufacturing aptitude: deviation of film winding in the manufacturing process]

A roll was produced by winding a film in which an indentation was provided on one side of a side edge of a resin-made stretched film for 1500 m, and it was evaluated that there was no problem with manufacturing aptitude if the winding deviation of the film did not occur (indicated as "0" in the table). . It was evaluated that the winding deviation of the film occurred as having a problem in manufacturing aptitude (indicated by "x" in the table).

[indentation state]

The film was pulled out 1 m from the roll of the film, and it was visually confirmed whether or not an indentation was provided on one side of the side edge of the film. If an indentation was provided to the side edge portion of the film, it was evaluated that there was no problem in the indentation state (indicated as "0" in the table). When a through hole was provided at the side edge of the film, it was evaluated that there was a problem in the indentation state (indicated by "x" in the table).

[Heat contraction rate]

The thermal shrinkage rate of the stretched resin film was calculated by the following formula by immersing a 100 mm square stretched resin film in hot water at 100 ° C. for 3 minutes, taking it out, cooling it to room temperature, measuring the dimensions of the shrunken film sample. .

·MD heat shrinkage rate (%)

(100-length of MD of film after shrinkage (mm))/100×100

・TD heat shrinkage rate (%)

(100-length of TD of film after shrinkage (mm))/100×100

[Retort (Pressure Heat Sterilization) Resistance]

The retort resistance of the filled package body of the present invention was evaluated by the following method. That is, using an RCS type retort sterilizer FlavorAce-60/10TG manufactured by Hisaka Manufacturing Co., Ltd., 10 filled packages were placed in a retort pot at a temperature of 120°C and a pressure of 2.0 kg/cm2 (gauge pressure). After leaving still for 10 minutes, it was taken out, and the number of objects (number of punctures) of those in which the longitudinal seal portion was peeled off or those in which the longitudinal seal portion had cracks were visually counted. If the number of punctures was 0, the filled package body was evaluated as having retort resistance (indicated as "0" in the table). If the number of punctures was one or more, the filled package body was evaluated as having no retort resistance (indicated by "x" in the table).

[state of through hole]

Of the filled packaging bodies after the retort treatment, five samples were sampled in which no puncture occurred. The number of samples in which through holes were provided in the outer ear portion of the obtained sample was visually counted. When a through hole was provided in the outer ear portion, it was evaluated that there was no problem in the state of the through hole. (Represented as "0" in the table). If no through hole was provided to the outer ear part and the state was indented, it was evaluated that the through hole state had a problem (indicated by "x" in the table).

[Ease of opening]

Among the sealed packages after the retort treatment, a sample was randomly sampled from one in which no puncture had occurred. About the obtained sample, if the outer ear part could be opened by picking up, it was evaluated as good openability (indicated by "0" in the table). If the outer ear portion could not be opened by picking up, the openability was evaluated as poor (indicated by "x" in the table).

[Example 1]

PVDC (Vinylidene chloride-vinyl chloride copolymer made 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) was melted and extruded from an annular die to produce an annular film, and at a stretching temperature of 28° C., inflation biaxial stretching of 2.4 times in MD (longitudinal direction) and 4.0 times in TD (transverse direction) was performed, and the inside of the annular film was melted. By overlapping each other, a strip-shaped stretched film made of PVDC having a thickness of 40 μm (thickness of two films having a thickness of 20 μm) was obtained. The heat shrinkage rates of the obtained stretched film made from PVDC were 22.4% in MD and 19.9% in TD.

Thereafter, the strip-shaped film was cut to obtain a strip-shaped film master having indentations as shown in FIG. 7 . In addition, the depth (a) of the indentation was 25% (10 μm) of the total film thickness, the interval (b) of the indentation was 3.0 mm, the width (c) of the indentation was 0.8 mm, and the interval (d) of the indentation row was 1.0 mm. , the distance (e) of the indentation from the side edge of the film was 1.5 mm, and the indentation rows were two rows (the two rows a, b, and c were the same, and the distance (f) of the adjacent indentation rows in the longitudinal direction was 1.5 mm). After that, the strip-shaped PVDC film is wound into a cylindrical shape so that both edges extending in the longitudinal direction overlap to form a cylindrical film, and the both edges where the cylindrical film overlaps are separated based on a predetermined voltage and current. By passing between the sealing electrode and the earth electrode of a high-frequency dielectric heating device to which a high-frequency electric power applied thereto is longitudinally sealed at both ends of the cylindrical film, and has an outer ear portion extending in the longitudinal direction and having a width of 8 mm. A cylindrical PVDC film having a portion was formed. Next, the cylindrical PVDC film was filled with mashed fish meat (52% mashed fish meat, 23% water, 13% starch, 10% lard, 2% salt) for fish meat sausage from a filling device. Then, both ends of the cylindrical PVDC film in the longitudinal direction were bundled with an aluminum wire clip and cut to prepare a packed package having a circumference of 42 mm and a length between clips of 170 mm. Each of the filled packaging bodies was filled with 20 g of mashed fish paste for fish meat sausage and sealed. Table 1 shows evaluation results of various performance evaluations before retorting, and Table 2 shows evaluation results of various performance evaluations after retorting (pressure heat sterilization).

[Table 1]

[Table 2]

As shown in Tables 1 and 2, the resin-made stretched film according to the present invention, even if it has an indentation, can suppress the winding deviation of the film in the manufacturing process, and the film short circuit in the manufacturing process of the filled package body. It was confirmed that it is difficult to cause 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 by heating under pressure (heat treatment).

1: resin-made stretched film
2: side edge
3: side edge
4: indentation
5: indentation heat
6: disc rotation pressure body
7: roll member
8: outer ear
9: through hole
10: through hole row
11: filling package

Claims (7)

As a stretched resin film having indentations:
The indentation does not penetrate the resin-made stretched film,
The stretched resin film has rows of indentations parallel to 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 of the indentation 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. According to claim 1,
A stretched resin film in which the number of indentation rows is 1 to 20. According to claim 1 or 2,
A resin-made stretched film containing a vinylidene chloride-based resin. Both edge portions of the stretched resin film according to any one of claims 1 to 3 overlap each other so that the front and back surfaces of the stretched resin film face each other, and the stretched resin film has a cylindrical shape sealed in the longitudinal direction in the longitudinal direction. A packed package in which a film is filled with a content and both ends are sealed, wherein a side edge having an indentation row of the stretched resin film forms an outer part protruding in a belt shape from the outside of the stretched cylindrical resin film. . According to claim 4,
Heat-treated filling package. According to claim 5,
A packed body having a through hole in place of at least a part of the indentation. According to claim 6,
The outer ear part has a row of through holes in which the through holes are parallel to the longitudinal direction of the outer ear part at a side edge of 0.20 mm to 8.0 mm from the side end of the outer ear part, and the distance between the through holes in the longitudinal direction is 1.0 mm to 2.9 mm. , The width of the through hole in the transverse direction of the outer ear portion is 0.30 mm to 2.7 mm.