JP2018193078A - Package with opening tab - Google Patents

Abstract

To provide a package with an opening tab which enables firm opening of the package.SOLUTION: The package 2 has a cylindrical body, made of a first polymeric film, filled with storing content, and closed at both ends, and an opening tab 3 made of the second polymeric film is attached to the package with a part of its edge graspable. The shrinkage ratio of the second polymeric film at 120°C is more than 15.0%.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a package with an opening piece, and particularly relates to a package with an opening piece in which the package is formed of a tubular film.

  A package in which processed foods such as sausages are sealed is generally manufactured by filling the contents formed in a cylindrical film and then converging and ligating both ends. In order to facilitate the opening of the packaging film of such a package, an opening piece called a cut tape or an opener formed of a small film is attached to the packaging film. Specifically, a part of the opening piece is welded to the packaging film, and when the opening piece is pinched and turned, the welding film will be the starting point and the packaging film will be destroyed, so that the packaging film can be opened. Making it easy.

  In a conventional package with an open piece, when the open piece of the package is picked up, the open piece may be cut off halfway and the package may not be opened successfully. On the other hand, Patent Document 1 includes an opening piece formed from a vinylidene chloride-vinyl chloride copolymer resin containing a specific amount of a vinyl chloride monomer unit as a package with an opening piece having an opening piece that is difficult to cut. A package is also disclosed.

Japanese Patent Laying-Open No. 2006-166048 (published on September 15, 2016)

  However, even when the opening piece described in Patent Document 1 is used, it is not always sufficient in that the opening piece is difficult to cut, and further improvement is desired.

  Then, this invention is made | formed in view of said problem, The objective is to provide the package body with an open piece which can open a package body more reliably.

  In order to solve the above-mentioned problems, a package with an opening piece according to the present invention is formed of a first polymer film, the package is filled with contents, and both ends are closed. Body and an opening piece joined to the package so that a part of the edge can be pinched, and the second polymer film at 120 ° C. The shrinkage ratio at 1 is 15.0% or more.

  Further, the shrinkage rate (%) of the second polymer film at 120 ° C. and the shrinkage rate (%) of the package at 120 ° C. are the shrinkage rate (%) of the second polymer film at 120 ° C. And the difference is preferably more than 0 and 6.0 or less.

  Moreover, it is preferable that the shrinkage rate at 120 ° C. of the second polymer film is 23.0% or less.

  The second polymer film is preferably formed from a vinylidene chloride-vinyl chloride copolymer resin.

  The first polymer film is preferably formed from a vinylidene chloride copolymer resin.

  The present invention has an effect that the opened piece in the package with the opened piece is difficult to cut. Therefore, it is possible to provide a package with an opening piece that is easier to open.

It is a whole front view of the package body with an opening piece which concerns on embodiment of this invention. It is a front view of the junction part of the opening piece which concerns on embodiment of this invention. It is a front view which shows the example of a form of the junction part of the opening piece which concerns on embodiment of this invention.

  With reference to FIG. 1, the package body with an opening piece concerning embodiment of this invention is demonstrated. FIG. 1 is an overall front view of a package with an opening piece according to the present embodiment. The package 1 with an opening piece is composed of a package 2 and an opening piece 3 joined to the package 2.

[Packaging]
The package 2 is formed by filling the inside of a cylindrical body formed of a band-shaped base material film and closing both ends thereof.

(Tubular body)
The cylindrical body is formed by winding a belt-like base material film into a cylindrical shape, superimposing both sides extending in the longitudinal direction, and welding the superimposed both sides along the longitudinal direction. Forming. The overlapping of both sides of the band-shaped base film is performed by attaching an envelope in which the front (front) surface of one side extending in the longitudinal direction of the base film and the back side of the other side are brought into contact with each other, and the base material You may superimpose by any method of the palm-pasting which makes the surface or the back surfaces of the both sides extended in the longitudinal direction of a film contact and overlap.

  Both ends of the cylindrical body filled with the contents are closed to form a closed portion 4. In this embodiment, the both ends of the cylindrical body are closed by converging each end of the cylindrical body filled with the contents, and the converged portions are sandwiched from both sides by a synthetic resin tape to synthesize the converged portions. It is done by ligating by heat welding together with resin tape. However, if the contents can be sealed in the cylindrical body, the method is not limited to the method of ligating. As the synthetic resin forming the synthetic resin tape, a vinylidene chloride-vinyl chloride copolymer, a vinylidene chloride-methyl methacrylate copolymer, or a vinylidene chloride-vinyl chloride-vinyl acetate copolymer can be suitably used. Instead of using the synthetic resin tape, the converged portion of the cylindrical body may be directly welded and ligated.

(Base material film)
As the base material film, a polymer film (hereinafter referred to as a first polymer film) is used. When forming a cylindrical body from a base material film, in order to heat-weld base material films at high speed, it is desirable that the base material film is formed from a vinylidene chloride copolymer resin capable of high-frequency sealing. The vinylidene chloride copolymer resin is a resin containing a vinylidene chloride copolymer as a main component. In this specification, the vinylidene chloride copolymer is intended to be a copolymer of vinylidene chloride and a monomer copolymerizable with vinylidene chloride.

  Examples of monomers copolymerizable with vinylidene chloride include alkyl acrylates such as vinyl chloride, vinyl acetate, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, and stearyl acrylate. Esters (alkyl groups having 1 to 18 carbon atoms); methyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, stearyl methacrylate, etc. alkyl methacrylates (alkyl groups having 1 to 18 carbon atoms) A vinyl cyanide such as acrylonitrile and methacrylonitrile; an aromatic vinyl such as styrene; a vinyl ester of an aliphatic carboxylic acid having 1 to 18 carbon atoms such as vinyl acetate; an alkyl vinyl ether having 1 to 18 carbon atoms; an acrylic acid and a methacrylic acid; Acid, male Vinyl polymerizable unsaturated carboxylic acids such as acid, fumaric acid and itaconic acid; alkyl esters of vinyl polymerizable unsaturated carboxylic acids such as maleic acid, fumaric acid and itaconic acid (including partial esters, carbon number of alkyl group 1 -18); other examples include diene monomers, functional group-containing monomers, and polyfunctional monomers. These monomers can be used alone or in combination of two or more. Among these monomers, vinyl chloride, methyl acrylate, methyl methacrylate, butyl acrylate or vinyl acetate is preferable, and vinyl chloride is particularly preferable. Therefore, a particularly preferred vinylidene chloride copolymer is a vinylidene chloride-vinyl chloride copolymer.

  The content ratio of the vinylidene chloride monomer unit in the vinylidene chloride copolymer is preferably 70% by mass or more, more preferably 80% by mass or more. The upper limit of the content ratio of the vinylidene chloride monomer unit is not particularly limited, but is usually 99% by mass and in most cases 95% by mass from the viewpoint of extrudability.

  The shrinkage at 120 ° C. of the package using the first polymer film is preferably 9% or more, more preferably 11% or more, and further preferably 12% or more. The shrinkage of the package using the first polymer film can be controlled, for example, by biaxially stretching the resin forming the first polymer film after melt extrusion using an extruder screw. It is. However, the control method is not limited to this.

  The shrinkage at 120 ° C. of the package using the first polymer film in the present specification is 120 ° C., 0.2 MPa after marking 20 mm intervals in the longitudinal direction of the package packed with the filler. After pressurizing and heating in hot water for 15 minutes, the interval between the marks was measured, and the rate of change was calculated in%.

  When forming the first polymer film, various additives can be contained for improving the extrusion processability. Examples of additives include plasticizers, stabilizers, antioxidants, surfactants, pigments, and the like, and they can be used in appropriate combinations depending on the application. Both organic compounds and inorganic compounds can be used as additives. The organic compound may be a polymer.

  Examples of the plasticizer include acetyl tributyl cytolate (ATBC), diacetylated monolauryl glyceride (DALG), dibutyl sebacate (DBS), and dioctyl sebacate (DOS).

  Stabilizers include, for example, epoxidized oils such as epoxidized soybean oil (ESBO) or epoxidized linseed oil (ELO); amide derivatives of fatty acid alkyl esters; magnesium hydroxide; and tetrasodium pyrophosphate.

  Antioxidants include 2,6-di-tert-butyl-4-methyl-phenol (BHT), triethylene glycol-bis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate Phenolic antioxidants such as 2,4-dimethyl-6-S-alkylphenol, 2,4-dimethyl-6- (1-methylpentadecyl) phenol and mixtures thereof; thiodipropionic acid and distearylthiodipro And thioether-based antioxidants such as pionate; and phosphite-based antioxidants such as trisnonylphenyl phosphite and distearyl pentaerythritol diphosphite.

  Examples of the surfactant include nonionic surfactants such as sorbitan fatty acid ester, polyglycerin fatty acid ester, and polyoxyethylene sorbitan fatty acid ester.

  Examples of the pigment include azo pigments (for example, insoluble monoazo pigments, insoluble disazo pigments, condensed azo pigments), phthalocyanine pigments, anthraquinone pigments, quinacridone pigments, thioindigo pigments, perinone pigments, dioxazine pigments, Organic pigments such as isoindolinone pigments and isoindoline pigments; inorganic pigments such as titanium oxide, cobalt blue, silicon dioxide, aluminum pigments, mica and carbon black; and extender pigments such as calcium carbonate and magnesium oxide It is done.

  The first polymer film may contain a lubricant. In this embodiment, a commonly used lubricant can be selected, an inorganic lubricant or an organic lubricant can be used, and an organic lubricant is preferable.

  Examples of the inorganic lubricant include silicon dioxide, zeolite and calcium carbonate.

  As the organic lubricant, saturated fatty acid amides, unsaturated fatty acid amides, substituted amides and the like that have been conventionally used as organic lubricants can be preferably used. Examples of saturated fatty acid amides include butyramide, valeric acid amide, caproic acid amide, caprylic acid amide, capric acid amide, lauric acid amide, myristic acid amide, palmitic acid amide, stearic acid amide, arachidic acid amide, and behenic acid amide. Can be used. As the unsaturated fatty acid amide, oleic acid amide, erucic acid amide or the like can be used. Further, substituted amides such as N-oleyl palmitate, N-stearyl stearate, N-stearyl oleate, N-oleyl stearate and N-stearyl erucamide, methylol amide such as methylol stearate, Use saturated fatty acid bisamides such as methylene bis stearamide and ethylene bishydroxy stearamide, unsaturated fatty acid bisamides such as ethylene biserucamide, and aromatic bisamides such as m-xylylene bishydroxy stearamide be able to.

(Contents)
The contents to be filled in the package 2 are preferably prepared from fish meat paste (raw fish paste product and fish sausage raw material) as edible fish meat. It may be. The fish paste is typically pasty, initially sol before heating, and gelled by heating.

[Opened piece]
The opening piece 3 is a member formed of a polymer film (hereinafter referred to as a second polymer film) attached to the packaging body 2 in order to facilitate the opening of the packaging body 2. More specifically, the opening piece 3 is joined to the package 2 so that a part of the edge can be pinched.

  The second polymer film constituting the opening piece 3 is formed from a vinylidene chloride copolymer resin in consideration of being joined to the package 2 formed by the first polymer film in a later step. It is desirable. Examples of the vinylidene chloride copolymer resin include the vinylidene chloride copolymers described above (base material film). A particularly preferred vinylidene chloride copolymer is a vinylidene chloride-vinyl chloride copolymer. When it is formed from a vinylidene chloride-vinyl chloride copolymer resin, it may be composed of one kind of vinylidene chloride-vinyl chloride copolymer, including two or more kinds of vinylidene chloride-vinyl chloride copolymers. It may be configured.

  The content ratio of the vinylidene chloride monomer unit in the vinylidene chloride copolymer is preferably 70% by mass or more, more preferably 80% by mass or more. The upper limit of the content ratio of the vinylidene chloride monomer unit is not particularly limited, but is usually 99% by mass and in most cases 95% by mass from the viewpoint of extrudability.

  The shrinkage rate at 120 ° C. of the second polymer film is 15.0% or more, preferably 17.0% or more, and more preferably 18.0% or more. When the shrinkage rate at 120 ° C. of the second polymer film is in the above range, the opening piece 3 is cut off in the middle when the opening piece 3 is peeled off to open the package 1 with the opening piece. Can be prevented.

  From the viewpoint of preventing the opening piece 3 from being cut off in the middle, there is no upper limit of the shrinkage rate of the second polymer film at 120 ° C., but it is, for example, 30% or less, preferably 28% or less. More preferably, it is 25% or less. On the other hand, it is preferable that the shrinkage rate at 120 ° C. of the second polymer film is 23.0% or less from the viewpoint of preventing poor appearance when the package 1 with the unsealed piece is heat-coagulated.

  In the present specification, the shrinkage rate of the second polymer film at 120 ° C. is a sample piece obtained by cutting the polymer film 100 mm in the MD direction (extrusion flow direction) and 20 mm in the TD direction (width direction). This is a value obtained by measuring the dimension in the MD direction after pressurizing and heating for 15 minutes in hot water of 2 MPa, and calculating the rate of change in%.

  It is considered that the greater the shrinkage rate of the second polymer film, the greater the resistance of the film when pinching the opening pieces 3. Therefore, it is estimated that the strength reduction due to the opening piece 3 being stretched and thinned is less likely to occur, and the opening piece 3 is difficult to cut.

  The shrinkage rate of the second polymer film can be controlled, for example, by biaxially stretching the resin forming the second polymer film after melt extrusion using an extruder screw. For example, when the second polymer film is a vinylidene chloride-vinyl chloride copolymer, in order to control the shrinkage rate of the second polymer film at 120 ° C. to the above range, a vinylidene chloride-vinyl chloride copolymer is used. After melt extrusion of the resin and inflation biaxial stretching (MD direction: 1.2 to 6.0 times, TD direction: 1.2 to 6.0 times), MD direction and TD direction are relaxed by 5 to 10% (shrinkage) It is desirable to perform heat treatment (tensile heat treatment) at 40 ° C. to 110 ° C. while restraining (straining) the MD direction and TD direction of the film so as not to shrink using a tenter device.

  Further, in relation to the shrinkage rate of the package using the first polymer film, the shrinkage rate in the second polymer film is larger than the shrinkage rate in the package using the first polymer film, The difference is preferably more than 0 and 6.0 or less. The difference between the shrinkage rate in the second polymer film and the shrinkage rate in the package using the first polymer film is more preferably 1 or more and 6 or less, and further preferably 2 or more and 6 or less. When the shrinkage rate of the package using the first polymer film and the shrinkage rate of the second polymer film satisfy this relationship, the first polymer film constituting the package 2 is easily cleaved, and as a result The cutting of the opening piece 3 can be prevented. When the shrinkage rate of the packaging body using the first polymer film and the shrinkage rate of the second polymer film satisfy the above relationship, the packaging body 1 with the opening piece is heated and solidified, and then the packaging body 2 is opened. Then, it is presumed that stress concentration occurs at the joint portion of the first polymer film constituting the package 2 and the first polymer film is easily cleaved.

  When forming the second polymer film, various additives can be contained for improving the extrudability. The additive that can be used is the same as the additive that can be used to form the first polymer film.

  The opening piece 3 in the present embodiment has a rectangular shape, but the shape is not particularly limited as long as one end can be pinched with fingers and pulled so as to be turned from the package 2, and the square, rectangular, Polygons such as triangles and pentagons and shapes such as circles and ellipses can be taken.

  As described above, in the package 1 with the unsealed piece, the unsealed piece 3 is joined to the package 2. Specifically, it is joined to the package 2 at the joint of the opening piece 3. FIG. 2 shows a joint portion of the unsealed piece 3 in the present embodiment. The joint portion is constituted by the main joint portion 5 and the temporary holding portion 6. The main joining part 5 and the temporary pressing part 6 are used to bond the opening piece 3 to the package 2 and to give the package a break that is the starting point when the package is opened. The seal strength of the temporary holding portion 6 is preferably weaker than the seal strength of the main joint portion 5. When the main joint portion 5 and the temporary pressing portion 6 are provided by ultrasonic bonding, the seal strength of the temporary pressing portion 6 is changed by changing the anvil height in the temporary pressing portion 6 with the anvil height in the main bonding portion 5. The seal strength can be made weaker than 5. Alternatively, the seal strength of the temporary pressing portion 6 can be made weaker than the sealing strength of the main joint portion 5 by knurling the anvil or horn in the temporary pressing portion 6.

  Ultrasonic welding is suitably used as a method for bonding the opening piece 3 to the package 2, but other bonding methods such as high-frequency welding can also be used. Moreover, the method of joining the opening piece 3 to the package 2 is not limited to welding, For example, you may use methods, such as adhesion | attachment which uses an adhesive agent.

  The shape of the joint part of the opening piece 3 is not limited to the form shown in FIG. For example, it may be a form as shown in FIGS. 3A to 3F, or may be another form.

[Manufacture of packaging with unsealed pieces]
The package 1 with an opening piece is manufactured in the following manner. A strip-shaped base material film to be a cylindrical body and a second polymer film for forming the unsealed piece 3 are each installed in a manufacturing apparatus as a raw fabric. Then, the strip-shaped base material film is drawn out, the second polymer film is cut out as an opening piece 3, and the base material film and the opening piece 3 are joined by the joint portion. The band-shaped base material film to which the opening piece 3 is bonded is wound into a cylindrical shape so that both sides are overlapped, and a vertical seal is formed on the overlapped portion, thereby forming a cylindrical body. Thereafter, the cylindrical body is filled with the contents, and the contents are squeezed at a predetermined interval (the length of the packaging body 2) to form a non-existing portion of the contents in the cylindrical body. This non-existing portion is bundled and sealed by winding and welding a synthetic resin tape. Then, the sealed intermediate portion of the non-existing portion that is bundled so that the sealing performance of the end portion is maintained is cut. The package 1 with an opening piece is obtained by the above. The package 1 with the opening piece is
If necessary, a heat coagulation treatment is subsequently performed.

[Example 1]
(Manufacture of base material film)
A copolymer (100 parts by mass) having a monomer charge mass ratio (VD / VC) of 81/19 during polymerization of vinylidene chloride (VD) and vinyl chloride (VC) was added to acetyltributyl citrate (ATBC), dibutyl seba A total of 8 parts by mass of Kate (DBS) and epoxidized vegetable oil was added, and a total of 1.4 parts by mass of an epoxy group-containing polymer, a surfactant, stearamide, and silicon dioxide were added to obtain a polyvinylidene chloride resin. . Next, the obtained polyvinylidene chloride resin was melt-extruded using an extruder screw having a diameter of 90 mm, and then biaxially stretched to obtain a base material film.

(Manufacture of film for opening pieces)
A copolymer (100 parts by mass) having a monomer charge mass ratio (VD / VC) of 80/20 during polymerization of vinylidene chloride (VD) and vinyl chloride (VC) was added to acetyltributyl citrate (ATBC), dibutyl seba A total of 8 parts by mass of Kate (DBS) and epoxidized vegetable oil was blended, and 0.1 parts by mass of stearamide and silicon dioxide were further added to obtain a polyvinylidene chloride resin. Next, the obtained polyvinylidene chloride-based resin was melt extruded into a cylindrical shape using an extruder screw having a diameter of 90 mm, and then subjected to inflation biaxial stretching (MD: 2.7 times, TD: 4.1 times). The film a was obtained by relaxing (shrinking) 8% in the MD direction and 7% in the TD direction at 140 ° C. (passing time through the heating zone was about 1 second). Thereafter, the film a is further heat-treated (hereinafter referred to as tension heat treatment) so as not to shrink in the MD direction and the TD direction at 60 ° C. for 1 minute, and has a total thickness of 80 μm (two layers of films having a thickness of 40 μm). An opening piece film b was obtained.

(Manufacture of packaging with unsealed pieces)
The base material film was cut into a width of 80 mm. Moreover, the film for opening pieces was cut | judged to width 20mm, and the opening piece was produced. After the opened piece was cut into a length of 12 mm, the opened piece was ultrasonically welded to the base material film by ultrasonic sealing (the shape of the joining portion is shown in FIG. 2) to obtain a base material film with an opened piece. While forming the base material film with an open piece into a cylindrical shape, a filler (fish meat 50% by mass, ice water 28.6% by mass, vegetable oil 10% by mass, corn starch 8% by mass, soybean protein 2% by mass and salt 1.4% by mass) Paste) is filled with an automatic filling and packaging machine (trade name: KAP3000 type automatic filling and packaging machine manufactured by Kureha Co., Ltd.) and ultrasonic welding is performed with a reinforcing tape while converging the edges of the base material film with an open piece. And then sealed and sealed to obtain a package. In addition, in the base material film with a cylindrical opening piece, the folding width (length of half of the circumference) is 36 mm, the cut length (the packing material is extracted from the package, and the base material film with the cylindrical opening piece is pressed flat. The conditions were adjusted so that the length when measured in the longitudinal direction was 210 mm and the mass was 65 g. The package was sterilized by heating in 120 ° C., 0.2 MPa hot water for 15 minutes to obtain a package after heat sterilization.

[Example 2]
In the production of the film for opening pieces, the film a was further subjected to tension heat treatment at 80 ° C. for 1 minute to obtain a film c for opening pieces having a total thickness of 80 μm (two layers of 40 μm thick films).

  The base material film and the package with the opening piece were produced in the same manner as in Example 1.

Example 3
In the production of the opening piece film, the film a was further subjected to tension heat treatment at 100 ° C. for 1 minute to obtain an opening piece film d having a total thickness of 80 μm (two layers of 40 μm thick films).

  The base material film and the package with the opening piece were produced in the same manner as in Example 1.

Example 4
In the production of the film for opening pieces, the film a was further subjected to tension heat treatment at 110 ° C. for 1 minute to obtain a film e for opening pieces having a total thickness of 80 μm (two layers of films having a thickness of 40 μm).

  The base material film and the package with the opening piece were produced in the same manner as in Example 1.

[Comparative Example 1]
In the production of the film for opening pieces, the film a is further shrunk by 0.8% in the MD direction and 25% in the TD direction at 110 ° C. for 5 seconds, so that the total thickness is 80 μm (two layers of 40 μm thick films). A film for opening f was obtained.

  The base material film and the package with the opening piece were produced in the same manner as in Example 1.

[Comparative Example 2]
In the production of the film for opening pieces, the film a was further subjected to tension heat treatment at 120 ° C. for 1 minute to obtain a film g for opening pieces having a total thickness of 80 μm (two layers of films having a thickness of 40 μm).

  The base material film and the package with the opening piece were produced in the same manner as in Example 1.

[Comparative Example 3]
In the production of a film for an opening piece, a roll obtained by winding 480 m on an iron pipe having an outer diameter of 76 mm is heat-treated at 60 ° C. for 3 days, thereby opening the opening piece having a total thickness of 80 μm (two layers of 40 μm thick films). Film h was obtained.

  The base material film and the package with the opening piece were produced in the same manner as in Example 1.

(Measurement method of shrinkage of package)
After putting a mark at intervals of 20 mm in the longitudinal direction of the package, it was sterilized under pressure and heat in hot water at 120 ° C. and 0.2 MPa for 15 minutes. The interval between the marks after heat sterilization was measured, and the change rate was calculated in% (average value of n = 5), which was 17.0%.

(Measurement method of shrinkage rate of film for opening pieces)
The film for opening piece was cut 100 mm in the MD direction and 20 mm in the TD direction, and then heated under pressure in hot water at 120 ° C. and 0.2 MPa for 15 minutes. The dimension in the MD direction after pressure heating was measured, and the rate of change was calculated in% units (average value of n = 5). In addition, although the difference with the shrinkage | contraction rate of the package in each film for opening pieces is shown in Table 1, when the value is positive, the shrinkage rate of the film for opening pieces is larger than the shrinkage rate of the package. When the value is negative, it indicates that the shrinkage rate of the film for opening pieces is smaller than the shrinkage rate of the package.

[Opening performance evaluation]
The opening success rate was calculated | required about the package after heat sterilization, and opening performance was implemented. Ten panelists opened each time three times (three), and determined the opening rate for a total of 30. At this time, the non-breaking rate indicates an average value of the ratio at which the unsealed piece can be opened without being cut halfway when the unsealed piece is opened. The results are shown in Table 1. As shown in Table 1, in the package with unsealed pieces according to Examples 1 to 4, the unsealing success rate is improved as compared with the package with unsealed pieces of Comparative Examples 1 and 2.

[Appearance discrimination of opened pieces after heat sterilization]
The appearance of the opened piece after heat sterilization was visually observed, and the case where the shape of the opened piece was clearly deformed was evaluated as x, and the case where it was hardly deformed was evaluated as n (n = 5). The results are shown in Table 1. As shown in Table 1, in the package with opened pieces according to Examples 1 to 4, the appearance of the opened pieces after heat sterilization was good. On the other hand, in Comparative Example 3 in which the shrinkage rate of the opened piece film exceeded 23%, the shape of the opened piece was clearly deformed.

  The present invention can be used as a package for foods such as sausages.

DESCRIPTION OF SYMBOLS 1 Packing body with opening piece 2 Packing body 3 Opening piece 4 Closure part 5 Main junction part 6 Temporary pressing part

Claims (5)

A package formed of a first polymer film, filled with contents inside a cylindrical body, and closed at both ends;
An opening piece that is formed from the second polymer film and is joined to the package so that a part of the edge can be pinched;
A package with an opening piece, wherein the shrinkage rate of the second polymer film at 120 ° C is 15.0% or more.   The shrinkage rate (%) of the second polymer film at 120 ° C. and the shrinkage rate (%) of the packaging body at 120 ° C. are larger than the shrinkage rate (%) of the second polymer film at 120 ° C. The packaging body with an opening piece according to claim 1, wherein the difference is more than 0 and 6.0 or less.   The package with an open piece according to claim 1 or 2, wherein the second polymer film has a shrinkage rate at 120 ° C of 23.0% or less.   The package with an open piece according to any one of claims 1 to 3, wherein the second polymer film is formed of a vinylidene chloride-vinyl chloride copolymer resin.   The package with an open piece according to any one of claims 1 to 4, wherein the first polymer film is formed of a vinylidene chloride copolymer resin.

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