KR102277063B1 - package with opening - Google Patents

Abstract

A package with an opening piece capable of more reliably opening the package is provided. The package body 1 with the opening piece is formed of a first polymer film, the contents are filled inside the cylindrical body, and the package body 2 is closed at both ends, and is formed of a second polymer film, An opening piece 3 bonded to the package body is provided so that a part of the edge can be picked up, and the shrinkage rate of the second polymer film at 120° C. is 15.0% or more.

Description

package with opening

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

A package in which processed food such as sausage is sealed is generally manufactured by filling a film formed in a cylindrical shape with the contents, and then ligating both ends together. In order to facilitate the opening of the packaging film of such a package, a cut tape formed of a small film or an opening piece called an opener is attached to the packaging film. Specifically, a part of the unsealing piece is welded to the packaging film, and when the unsealing piece is pinched and turned, the welded portion becomes the starting point and the packaging film is destroyed, thereby facilitating the unsealing of the packaging film of the package.

In the case of a package with a conventional unsealing piece, when the unsealed piece of the package is picked up and folded, the unsealed piece may break in the middle, making it difficult to open the package. On the other hand, in Patent Document 1, a package with an unsealed piece having an unbreakable piece is provided, and the package is provided with an unsealed piece formed of a vinylidene chloride-vinyl chloride copolymer resin containing a specific amount of vinyl chloride monomer units. sieve is disclosed.

Patent Document 1: Japanese Patent Application Laid-Open No. 2016-166048 (published on September 15, 2016)

However, even when the unsealed piece described in Patent Document 1 is used, it cannot be said that it is necessarily sufficient at the point that the unsealed piece is hard to break, and further improvement is desired.

Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide a package with an opening piece that can open the package more reliably.

In order to solve the above problems, a package with an opening piece according to the present invention is formed of a first polymer film, the contents are filled inside the cylindrical body, and the package body is closed at both ends, and a second polymer film It is formed of, and has an opening piece bonded to the package so that a part of the edge can be picked up, and the shrinkage rate at 120° C. of the second polymer film is 15.0% or more.

The present invention exhibits the effect that the unsealed piece in the package with the unsealed piece is less likely to break. Therefore, it is possible to provide a package with an opening piece that can be opened more reliably.

BRIEF DESCRIPTION OF THE DRAWINGS It is the whole front view of the package body with an unsealing piece which concerns on embodiment of this invention.
It is a front view of the joint part of the unsealing piece which concerns on embodiment of this invention.
It is a front view which shows the example of the form of the junction part of the unsealing piece which concerns on embodiment of this invention.

A package with an unsealing piece according to an embodiment of the present invention will be described with reference to FIG. 1 . BRIEF DESCRIPTION OF THE DRAWINGS It is the whole front view of the package body with the unsealing piece which concerns on this embodiment. The package body 1 with the unsealing piece is comprised of the package body 2 and the unsealing piece 3 joined to the package body 2 .

[Package]

The package 2 is formed of a tubular body filled with contents therein, and a closing portion 4 that closes both ends of the tubular body.

(Cylindrical body)

The cylindrical body is formed from a strip|belt-shaped base material film. In the cylindrical body, a strip of base material film is wound into a cylindrical shape, both sides extending in the longitudinal direction overlap each other, and both sides overlapping each other are welded along the longitudinal direction to form a cylindrical shape. The overlapping of both sides of the base material film in the form of a strip is made by contacting the outer surface of one side extending in the longitudinal direction of the base film film and the back surface of the other side to overlap each other, and attaching the cylinder to overlap each other, and extending in the longitudinal direction of the base film You may make them overlap each other by any method of lamination|pasting which overlaps each other by making the front surfaces of both sides contact or the back surfaces.

Both ends of the cylindrical body filled with the content inside are closed, and the closing part 4 is formed. In the present embodiment, the closing of both ends of the cylindrical body focuses on each end of the cylindrical body filled with the contents, pinches the focused portion from both sides with a synthetic resin tape, and heats the focused portion with the synthetic resin tape. It is performed by ligating by welding. However, as long as the contents can be sealed in the cylindrical body, the method is not limited to the method of ligation, for example, a method of sealing the end of the cylindrical body with an aluminum wire or the like may be used. As the synthetic resin for 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. Further, without using a synthetic resin tape, the focused portion of the cylindrical body may be directly welded and ligated.

(base film)

As the base film, a polymer film (hereinafter, a first polymer film) is used. Since the base film is heat-welded at high speed when the cylindrical body is formed from the base film, the base film is preferably formed of a vinylidene chloride-based copolymer resin capable of high-frequency sealing. The vinylidene chloride-based copolymer resin is a resin containing a vinylidene chloride-based copolymer as a main component. In the present specification, the vinylidene chloride-based copolymer means a copolymer of vinylidene chloride and a monomer copolymerizable with vinylidene chloride.

As the monomer copolymerizable with vinylidene chloride, for example, an acrylic acid alkyl ester such as vinyl chloride, vinyl acetate, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate or stearyl acrylate (alkyl group having 1 carbon atom) ~18); methyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, or methacrylic acid alkyl ester (alkyl group having 1 to 18 carbon atoms); vinyl cyanide, such as acrylonitrile and methacrylonitrile; 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, 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, the alkyl group having 1 to 18 carbon atoms); In addition, a diene type monomer, a functional group containing monomer, a polyfunctional monomer, etc. are mentioned. These monomers can be used individually or in combination of 2 or more types. 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 preferable vinylidene chloride-based copolymer is a vinylidene chloride-vinyl chloride copolymer.

The content of the vinylidene chloride monomer unit in the vinylidene chloride-based copolymer is preferably 70% by mass or more, more preferably 80% by mass or more. Although there is no upper limit in particular of the content rate of a vinylidene chloride monomeric unit, From a viewpoint, such as extrusion processability, it is 99 mass % normally, and 95 mass % in most cases.

The shrinkage at 120°C of the package using the first polymer film is preferably 9% or more, more preferably 11% or more, and still more preferably 12% or more. The shrinkage rate of the package using the first polymer film can be controlled by, for example, melt-extruding the resin forming the first polymer film using an extruder screw and then biaxially stretching the resin. However, the control method is not limited thereto.

The shrinkage rate at 120°C of the package using the first polymer film in the present specification is, after displaying at intervals of 20 mm in the longitudinal direction of the package filled with the packing material, at 120°C, 0.2 MPa of hot water (熱水 (熱水) ), after heating under pressure for 15 minutes, the interval of the display is measured and the change rate is calculated in % unit.

When forming the first polymer film, various additives may be included to improve extrusion processability and the like. As an additive, a plasticizer, a stabilizer, antioxidant, surfactant, a pigment, etc. are mentioned, for example, According to a use, it can use combining suitably. 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 citrate (ATBC), diacetylated monolauryl glyceride (DALG), dibutyl sebacate (DBS), and dioctyl sebacate (DOS).

Examples of the stabilizer include 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.

As the antioxidant, 2,6-di-tert-butyl-4-methyl-phenol (BHT), triethylene glycol-bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propio phenolic antioxidants such as nitrate, 2,4-dimethyl-6-S-alkylphenol, 2,4-dimethyl-6-(1-methylpentadecyl)phenol, and mixtures thereof; thioether-based antioxidants such as thiodipropionic acid and distearylthiodipropionate; and phosphite-based antioxidants such as trisnonylphenylphosphite and distearylpentaerythritol diphosphite.

Nonionic surfactants, such as sorbitan fatty acid ester, polyglycerol fatty acid ester, and polyoxyethylene sorbitan fatty acid ester, etc. are mentioned as surfactant.

Examples of the pigment include azo pigments (eg, insoluble monoazo pigments, insoluble disazo pigments, condensed azo pigments), phthalocyanine pigments, anthraquinone pigments, quinacridone pigments, thioindigo pigments, and perinone pigments. organic pigments such as pigments, dioxazine pigments, 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.

In addition, the first polymer film may contain a lubricant. In this embodiment, a lubricating agent generally used can be selected, and an inorganic lubricating agent or an organic lubricating agent can be used, Preferably it is an organic lubricating agent.

Silicon dioxide, zeolite, calcium carbonate, etc. are mentioned as an inorganic lubricant.

As the organic lubricant, saturated fatty acid amide, unsaturated fatty acid amide, and substituted amide, which have been conventionally used as organic lubricants, can be preferably used. Examples of the saturated fatty acid amide include butylamide, valeric acid amide, caproic acid amide, caprylic acid amide, capric acid amide, lauric acid amide, myristic acid amide, palmitic acid amide, stearic acid amide, arachid. Acid amide, behenic acid amide, etc. can be used. As unsaturated fatty acid amide, oleic acid amide, erucic acid amide, etc. can be used. In addition, substituted amides such as N-oleyl palmitic acid amide, N-stearyl stearic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide and N-stearyl erucic acid amide, methylol stearic acid Methylolamide such as amide, saturated fatty acid bisamide such as methylenebisstearic acid amide and ethylenebishydroxystearic acid amide, unsaturated fatty acid bisamide such as ethylenebiserucic acid amide, and m-xylenebishydroxystearic acid Aromatic bisamides, such as an amide, etc. can be used.

(contents)

As for the contents filled in the package 2, edible fish meat tenderloin (raw material of fish meat products and fish meat sausage) is appropriately used as a main raw material, but tender meat for broiled meat or processed cheese (process) cheese), etc. Fish meat tenderloin is typically in the form of grass at first, sol form before heating, and becomes gel form by heating.

[Opening edition]

The unsealing piece 3 is a member formed of a polymer film (hereinafter referred to as a second polymer film) mounted on the package 2 to facilitate unsealing of the package 2 . More specifically, the opening piece 3 is joined to the package body 2 so that a part of its edge can be picked up.

The second polymer film constituting the unsealing piece 3 is preferably formed of a vinylidene chloride-based copolymer resin in consideration of bonding to the package 2 formed by the first polymer film in a later step. Do. Examples of the vinylidene chloride-based copolymer resin include the vinylidene chloride-based copolymers described above (base film). A particularly preferable vinylidene chloride copolymer is a vinylidene chloride-vinyl chloride copolymer. When it is formed of a vinylidene chloride-vinyl chloride copolymer resin, it may be constituted by one kind of vinylidene chloride-vinyl chloride copolymer, or two or more kinds of vinylidene chloride-vinyl chloride copolymer. there may be

The content of the vinylidene chloride monomer unit in the vinylidene chloride-based copolymer is preferably 70% by mass or more, more preferably 80% by mass or more. Although there is no upper limit in particular of the content rate of a vinylidene chloride monomeric unit, From a viewpoint, such as extrusion processability, it is 99 mass % normally, and 95 mass % in most cases.

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. Since the shrinkage rate at 120° C. of the second polymer film is within the above range, when the unsealing piece 3 is peeled off to open the unsealed package 1, the unsealed piece 3 is cut in the middle. You can stop losing

From the viewpoint of preventing the unsealing piece 3 from breaking in the middle, there is no upper limit of the shrinkage rate at 120° C. of the second polymer film, but for example, 30% or less, preferably 28% or less, more preferably less than 25%. On the other hand, from the viewpoint of preventing the appearance of the package 1 having an unsealed piece from being deteriorated when subjected to heat coagulation treatment, the shrinkage ratio at 120° C. of the second polymer film is preferably 23.0% or less.

The shrinkage rate at 120 ° C. of the second polymer film in the present specification is a sample piece cut out by 100 mm in the MD direction (extrusion flow direction) and 20 mm in the TD direction (width direction), 120 ° C., 0.2 MPa After pressurizing and heating in hot water for 15 minutes, the dimension in the MD direction is measured, and the change rate is calculated in % unit.

It is thought that the resistance of the film at the time of picking up and bending the unsealing piece 3 also increases, so that the shrinkage rate of the 2nd polymer film is large. Therefore, it is estimated that it becomes difficult to generate|occur|produce the strength fall by the unsealing piece 3 drooping and thickness becomes thin, and the unsealing piece 3 becomes difficult to break.

The shrinkage rate of the second polymer film can be controlled by, for example, melt-extruding the resin forming the second polymer film using an extruder screw and then biaxially stretching. For example, when the second polymer film is a vinylidene chloride-vinyl chloride copolymer, in order to control the shrinkage rate at 120° C. of the second polymer film within the above range, a vinylidene chloride-vinyl chloride copolymer resin is melt-extruded. And, after inflation biaxial stretching (MD direction: 1.2 to 6.0 times, TD direction: 1.2 to 6.0 times), 5 to 10% relaxation (shrinkage) in the MD direction and TD direction, and further, a tenter device (tenter device) ), it is preferable to heat treatment (stress heat treatment) at 40° C. to 110° C. in a state of restraint (tension) so as not to contract the MD and TD directions of the film.

In addition, in terms of the relationship with 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, and the difference exceeds 0 and is 6.0 or less. desirable. The difference between the shrinkage ratio in the second polymer film and the shrinkage ratio in the package using the first polymer film is more preferably 1 or more and 6 or less, and still more 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. As a result of this, the breakage of the unsealing piece 3 can be prevented.

In addition, when the shrinkage ratio of the package using the first polymer film and the shrinkage rate of the second polymer film satisfy the above relationship, when the package 1 with the unsealed piece subjected to heat coagulation is opened, the package 2 is Stress concentration occurs at the joint between the first polymer film and the unsealing piece 3 constituting the first polymer film. As a result, it is estimated that the first polymer film is easily cleaved.

When forming the second polymer film, various additives may be included to improve extrusion processability and the like. The additives that can be used are the same as those that can be used for forming the first polymer film.

Although the unsealing piece 3 in this embodiment has a rectangular shape, the shape is not particularly limited as long as it can be pulled back from the package 2 by pinching one end with a finger, and a square, rectangular, or triangular shape. and polygons such as pentagons, and shapes such as circles and ovals.

As described above, in the package 1 with the unsealing piece, the unsealing piece 3 is joined to the package 2 . Specifically, the unsealing piece 3 is joined to the package 2 at the joint portion thereof. The junction part of the unsealing piece 3 in this embodiment is shown in FIG. The junction part is comprised by the main junction part 5 and the temporary press part 6 . The main joining portion 5 and the temporary pressing portion 6 are for bonding the unsealing piece 3 to the package 2, and to provide the package with a cut-off point serving as a starting point when the package is opened.

It is preferable that the sealing strength of the temporary pressing part 6 is weaker than the sealing strength of the main joint part 5. As shown in FIG. When installing the main joint 5 and the temporary pressing part 6 by ultrasonic bonding, by changing the anvil height in the temporary pressing part 6 to the anvil height in the main bonding part 5, the temporary pressing part 6 ) can be made weaker than the sealing strength of the main joint 5 . Alternatively, by knurling the anvil or horn in the temporary pressing part 6 , the sealing strength of the temporary pressing part 6 can be made weaker than the sealing strength of the main joint part 5 .

Although ultrasonic welding is suitably used for the method of joining the unsealing piece 3 to the package body 2, other joining methods, such as high frequency welding, can also be used. In addition, the method of bonding the unsealing piece 3 to the package body 2 is not limited to welding, For example, methods, such as adhesion|attachment using an adhesive agent, can also be used.

The shape of the junction part of the unsealing piece 3 is not restrict|limited to the form shown in FIG. For example, it may be in the same form as (a) to (f) of FIG. 3 , or may have another form.

[Manufacture of package with opening piece]

The package body 1 with the unsealing piece is manufactured in the following way. A strip-shaped base material film serving as a cylindrical body and a second polymer film for forming the unsealing piece 3 are respectively installed in the manufacturing apparatus as raw materials. Then, the strip-shaped base material film is pulled out, the second polymer film is cut out as an unsealing piece 3 , and the base material film and the unsealing piece 3 are joined by a bonding portion. The strip|belt-shaped base material film to which the unsealing piece 3 was joined is wound in the cylindrical shape so that both sides may overlap, and vertical sealing is made|formed at the overlapping part, and a cylindrical body is formed.

Thereafter, the tubular body is filled with the contents, and the contents are swept at a predetermined interval (length of the package body 2 ) to form an absence portion of the contents in the tubular body. This non-existent part is bundled up, and a synthetic resin tape is wound and welded to seal it. Then, the sealed middle portion of the bundled member portion is cut so that the sealing property of the end portion is maintained. By the above, the package 1 with the unsealing piece is obtained. The package 1 with the unsealed piece is subjected to heat coagulation treatment thereafter as necessary.

〔theorem〕

The package with the opening piece according to the present invention is formed of a first polymer film, the contents are filled inside the cylindrical body, and is formed of a package with both ends closed, and a second polymer film, and It has an opening piece bonded to the package so that it can be partially picked up, and the shrinkage rate of the second polymer film at 120° C. is 15.0% or more.

In addition, the shrinkage rate (%) at 120 ° C. of the second polymer film and the shrinkage rate (%) at 120 ° C. of the package are larger than the shrinkage rate (%) at 120 ° C. of the second polymer film, and the It is preferred that the difference is greater than 0 and less than or equal to 6.0.

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

In addition, it is preferable that the second polymer film is formed of a vinylidene chloride-vinyl chloride copolymer resin.

In addition, it is preferable that the first polymer film is formed of a vinylidene chloride-based copolymer resin.

Example

[Example 1]

(Manufacture of base film)

Acetyltributylcitrate (ATBC), dibutyl to a copolymer (100 parts by mass) having a monomer input mass ratio (VD/VC) of 81/19 in polymerization of vinylidene chloride (VD) and vinyl chloride (VC) A total of 8 parts by mass of sebacate (DBS) and epoxidized vegetable oil were blended, and further 1.4 parts by mass of a total of an epoxy group-containing polymer, surfactant, stearic acid amide and silicon dioxide were added to obtain a polyvinylidene chloride-based resin. Next, the obtained polyvinylidene chloride-based resin was melt-extruded using an extruder screw having a diameter of 90 mm, and then biaxially stretched to obtain a base film.

(Manufacture of film for opening edition)

Acetyltributylcitrate (ATBC), dibutyl to a copolymer (100 parts by mass) having a monomer input mass ratio (VD/VC) of 80/20 in polymerization of vinylidene chloride (VD) and vinyl chloride (VC) A total of 8 parts by mass of sebacate (DBS) and an epoxidized vegetable oil were blended, and 0.1 parts by mass of stearic acid amide and silicon dioxide in total were further added to obtain a polyvinylidene chloride-based resin.

Then, the obtained polyvinylidene chloride-based resin was melt-extruded into a cylindrical shape using an extruder screw having a diameter of 90 mm, followed by inflation biaxial stretching (MD: 2.7 times, TD: 4.1 times), and MD direction at 140 ° C. 8% and 7% in the TD direction to relax (shrink) (the passage time of the heating zone was about 1 second) to obtain a film a. After that, the film a is further heat treated (hereinafter, tension heat treatment) by restraining it from shrinking in the MD and TD directions at 60° C. for 1 minute, and the total thickness of 80 μm (two layers of 40 μm thick film overlapping) is opened. A convenient film b was obtained.

(Manufacture of package with opening pieces)

The base film was cut to a width of 80 mm. Furthermore, the film for unpacking pieces was cut out to 20 mm in width, and the unpacking piece was produced. After the unsealed piece was cut to a length of 12 mm, the unsealed piece was ultrasonically welded to the base material film by ultrasonic sealing (the shape of the joint was Fig. 2) to obtain a base material film with an unsealed piece. Filling (a paste containing 50% by mass of fish meat, 28.6% by mass of ice water, 10% by mass of vegetable oil, 8% by mass of cornstarch, 2% by mass of soybean protein and 1.4% by mass of salt) while forming a base film with an opening piece into a cylindrical shape was filled with an automatic filling packaging machine (manufactured by Kureha Corporation, trade name: KAP3000 type automatic filling packaging machine), and while converging the ends of the base film with unsealing pieces, a reinforcing tape was attached, melt-sealed by ultrasonic welding, and sealed to obtain a package.

And in the case of a base film with a cylindrical tear piece, the folding width (half of the circumference) is 36 mm, and the cut length (the filling is removed from the package, and the base material film with the cylindrical tear piece is spread flat and measured in the longitudinal direction) The conditions were adjusted so that the length) of 210 mm and the mass may be 65 g. The package was heat-sterilized under pressure in hot water at 120°C and 0.2 MPa for 15 minutes to obtain a package after heat sterilization.

[Example 2]

Production of the film for unsealing pieces WHEREIN: The film a was further subjected to tension heat treatment at 80°C for 1 minute to obtain a film c for unsealing pieces having a total thickness of 80 µm (two layers of films having a thickness of 40 µm).

A package with a base film and an unsealed piece was prepared in the same manner as in Example 1.

[Example 3]

Production of the film for unsealing pieces WHEREIN: The film a was further subjected to tension heat treatment at 100 ° C. for 1 minute to obtain a film d for unsealing pieces with a total thickness of 80 µm (two layers of films having a thickness of 40 µm).

A package with a base film and an unsealed piece was prepared in the same manner as in Example 1.

[Example 4]

Production of the film for unsealing pieces WHEREIN: The film a was further subjected to tension heat treatment at 110°C for 1 minute to obtain a film e for unsealing pieces with a total thickness of 80 µm (two layers of films having a thickness of 40 µm).

A package with a base film and an unsealed piece was prepared in the same manner as in Example 1.

[Comparative Example 1]

In the production of the film for unsealing piece, the film a was further contracted at 110° C. for 5 seconds, 0.8% in the MD direction, and 25% in the TD direction, so that the total thickness of 80 µm (two layers of 40 µm-thick film overlapping) was opened. A convenient film f was obtained.

A package with a base film and an unsealed piece was prepared in the same manner as in Example 1.

[Comparative Example 2]

In the production of the film for unsealing, the film a was further subjected to a tension heat treatment at 120° C. for 1 minute to obtain a film g for unsealing with a total thickness of 80 µm (two layers of films having a thickness of 40 µm).

A package with a base film and an unsealed piece was prepared in the same manner as in Example 1.

[Comparative Example 3]

In the production of the film for unsealing, a roll in which the film a is wound 480 m on an iron tube having an outer diameter of 76 mm is heat-treated at 60° C. for 3 days, thereby having a total thickness of 80 µm (two layers of films having a thickness of 40 µm). h was obtained.

A package with a base film and an unsealed piece was prepared in the same manner as in Example 1.

(Measuring method of shrinkage of package)

After marking at intervals of 20 mm in the longitudinal direction of the package, heat sterilization was performed under pressure in hot water at 120°C and 0.2 MPa for 15 minutes. As a result of measuring the display interval after heat sterilization and calculating the change rate in % (average value of n=5), it was 17.0%.

(Measuring method of shrinkage rate of film for opening piece)

After cutting out the film for unsealing pieces 100 mm in MD direction and 20 mm in TD direction, it pressurized and heated for 15 minutes in 120 degreeC and hot water of 0.2 MPa. The dimension in the MD direction after pressure heating was measured, and the change rate was computed in % unit (average value of n=5). And the difference with the shrinkage rate of the package in each film for opening piece is shown in Table 1. When the value is positive, it indicates that the shrinkage rate of the film for opening piece is larger than the shrinkage rate of the package, and when the value is negative, it is unopened. It has been shown that the shrinkage ratio of the single-use film is smaller than the shrinkage ratio of the package.

[Evaluation of unpacking performance]

The unsealing success rate was calculated|required about the package after heat sterilization, and the unsealing performance was evaluated. Ten panelists opened 3 times (3 pieces) with respect to each, and calculated|required the opening rate in a total of 30 pieces. At this time, the unbroken rate represents the average value of the ratio which was able to open without breaking on the way, when unsealing was performed from an unsealed piece. A result is shown in Table 1. As shown in Table 1, in the package with the unsealed piece according to Examples 1-4, the unsealing success rate is improved compared with the package with the unsealed piece of Comparative Examples 1 and 2.

[Appearance discrimination of unpacked pieces after heat sterilization]

Visually inspecting the appearance of the unsealed piece after heat sterilization, the unsealed piece whose shape was clearly deformed was regarded as a defective product (indicated by a × in the table), and an almost undeformed piece was regarded as a good product (indicated by a ○ in the table). did (n=5). A result is shown in Table 1. As shown in Table 1, in the package with the unsealed piece which concerns on Examples 1-4, the external appearance of the unsealed piece after heat sterilization was favorable. On the other hand, in Comparative Example 3 in which the shrinkage ratio of the unsealed film exceeded 23%, the shape of the unsealed piece was clearly deformed.

Shrinkage (%) Difference from package shrinkage rate (17%) Uninterrupted rate (%) Appearance of the unpacked piece after heat sterilization Example 1
(film b) 22.7 5.7 100 ○ Example 2
(film c) 20.9 3.9 96 ○ Example 3
(film d) 19.6 2.6 100 ○ Example 4
(film e) 17.6 0.6 88 ○ Comparative Example 1
(film f) 14.9 -2.1 58 ○ Comparative Example 2
(film g) 12.8 -4.2 58 ○ Comparative Example 3
(film h) 23.2 6.2 100 ×

Industrial Applicability

INDUSTRIAL APPLICATION This invention can be utilized as a packaging body of foodstuffs, such as a sausage.

1: Package with opening piece
2: package
3: Release
4: closure
5: main joint
6: Temporary press

Claims (5)

A package formed of a first polymer film, the contents of which are filled inside the cylindrical body, and both ends are closed;
It is formed of a second polymer film, is bonded to the package body so that a part of the edge can be picked up, and has an opening piece for cleaving the first polymer film constituting the package body,
The shrinkage rate at 120° C. of the second polymer film is 15.0% or more and 23.0% or less,
The shrinkage rate (%) at 120°C of the second polymer film and the shrinkage rate (%) at 120°C of the package have a larger shrinkage rate (%) at 120°C of the second polymer film, and the difference is 0 A package with an opening piece, characterized in that it exceeds and is 6.0 or less. delete delete According to claim 1,
The package with an opening piece, characterized in that the second polymer film is formed of a vinylidene chloride-vinyl chloride copolymer resin. According to claim 1,
The package with an opening piece, characterized in that the first polymer film is formed of a vinylidene chloride-based copolymer resin.

Images