JP7219536B2 - Cylindrical package - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cylindrical package.

2. Description of the Related Art Cylindrical packages using synthetic resin films are widely known for containing ham, sausage, cheese, sweet bean jelly, uiro, and the like. This cylindrical package is produced by an automatic filling packaging machine (for example, "ADP (registered trademark)" manufactured by Asahi Kasei Corp.), while running a strip-shaped synthetic resin film, so that both side edges are crossed and overlapped. It is manufactured by rolling into a shape, sealing the overlapped portion to form a tubular film, filling the tubular film with a content, and then ligating (sealing) the upper and lower ends.

The manufactured cylindrical package may be subjected to heat treatment such as retort treatment. At that time, if the sealing portion does not have sufficient adhesion, the cylindrical package cannot withstand the expansion of the contents due to heating, and the bag may break (retort puncture). In addition, the adhesion at the seal portion is also an important factor from the viewpoint of enhancing storage stability.

On the other hand, in order to peel off the tubular resin film from these tubular packages and take out the food as the contents, the tubular resin film is attached to the longitudinally sealed portions of both side edges extending in the longitudinal direction. A cut along or perpendicular to the longitudinally sealed portion must be made to expose the contents. At that time, if there is no sufficient openability, when the consumer takes out the contents, it may not be possible to open the package only by force of fingers.

To provide a cylindrical package which has easy-openability for facilitating taking out of contents from the cylindrical package and which has retort resistance such that the cylindrical package is not damaged during retort heating. For the purpose, for example, in Patent Document 1, a cylindrical resin film provided with a vertical seal portion having an outer ear portion extending in the longitudinal direction, and having both ends in the longitudinal direction converged is filled with contents and enclosed. A cylindrical package is disclosed in which the vertical seal portion having the outer ear portion extending in the longitudinal direction has a T-peel strength of 23 N or less and a shear peel strength of 40 N or more.

JP 2015-164860 A

However, with the method described in Patent Document 1, the T-peel strength achieved is high, and it is difficult to say that easy-openability is sufficiently achieved. Moreover, in a cylindrical package, which is expected to go through various manufacturing processes, it is required not to break the sealing even when a momentary impact such as dropping is applied. However, in the method described in Patent Document 1, although it is shown that the bag does not break due to expansion of the contents during heating (retort resistance), there is no mention of sealing failure due to a momentary pressure increase. . As described above, further improvements in easy-to-open property and improved sealing breakage resistance have not yet been achieved.

The present invention has been made in view of the above problems, and has easy-to-open properties, does not cause sealing failure even when an instantaneous internal pressure rise occurs, and has high retort resistance. The purpose is to provide the body.

The present inventors have made intensive studies to solve the above problems. As a result, the present inventors have found that the above problems can be solved by the sealing portion satisfying a predetermined condition, and have completed the present invention.

That is, the present invention is as follows.
[1]
a tubular film obtained by overlapping both side edges of a strip-shaped resin film so that the front and back surfaces of the resin film face each other;
and two or more seal portions obtained by fusing the overlapping portions of the tubular film in the longitudinal direction of the film,
In a cross section obtained by cutting the seal portion along a plane perpendicular to the longitudinal direction, the width of the seal portion in the surface direction of the resin film is 30 μm or more and 150 μm or less,
The distance between the seal portions is 2.2 % or more and 3.5% or less of the circumference of the tubular film,
The seal portion has a 180-degree peel strength of 10 N or less and a shear peel strength of 35 N or more.
Cylindrical package.
[2]
The resin film contains a vinylidene chloride-based copolymer resin and/or a polyamide-based resin,
[1] The tubular package.
[3]
wherein the sealing portion is formed by ultrasonic fusion;
The cylindrical package according to [1] or [2].
[4]
At least one row of scar groups in which a plurality of non-penetrating or penetrating holes or cuts are formed in a row in the film outer lug protruding in a band shape outside the tubular film,
The cylindrical package according to any one of [1] to [3].

According to the present invention, it is possible to provide a cylindrical package that is easy to open, does not cause sealing failure even when an instantaneous increase in internal pressure occurs, and has high retort resistance.

The perspective view of the cylindrical package of this embodiment is shown. The schematic diagram of the cross section which cut|disconnected the seal|sticker part by the plane perpendicular|vertical to a longitudinal direction is shown. The cross-sectional schematic diagram of the cylindrical package of this embodiment is shown. The schematic diagram which shows the example at the time of filling the content in the cylindrical package of this embodiment is shown. The schematic diagram showing the suitable example of the hole or cut|interruption formed in the cylindrical package of this embodiment is shown.

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

[Cylindrical package]
The cylindrical package of the present embodiment includes a cylindrical film obtained by superimposing both side edges of a strip-shaped resin film so that the front and back surfaces of the resin film face each other, and a superimposed portion of the cylindrical film. Equipped with two or more seal portions fused in the longitudinal direction, the width of the seal portion in the surface direction of the resin film in a cross section obtained by cutting the seal portion perpendicular to the longitudinal direction (hereinafter, "seal width" is 30 μm or more and 200 μm or less, the distance between the seal portions is 0.24% or more of the circumference of the tubular film, and the 180-degree peel strength of the seal portions is 10 N or less. , and the shear peel strength is 35 N or more.

(Seal part)
FIG. 1 shows a perspective view of a cylindrical package 10 of this embodiment. As shown in FIG. 1, a tubular film 1 is formed by overlapping both side edges of strip-shaped resin films so that the front and back surfaces of the resin films face each other. It has a seal portion 2a fused in the direction and a seal portion 2b substantially parallel to the seal portion 2a. Further, it may have other seal portions like the seal portion 2b. By having two or more seal portions 2a and 2b in this way, the force is distributed to each seal portion when the pressure rises instantaneously, so the seal breaking resistance against the instantaneous pressure rise is further improved. do. Also, as shown in FIG. 3, from the viewpoint of the balance between the easy-open property and the seal breakage resistance, when there is one seal portion as shown in FIG. Both unsealability and resistance to seal rupture must be achieved, but when a plurality of seals are provided as shown in FIG. Each sealing portion contributes to the improvement of easy-openability. Specifically, in the case of having a plurality of seal portions as shown in FIG. 3B, the plurality of seal portions need to be destroyed substantially at the same time when the sealing is broken by pulling the film in the surface direction of the resin film. , the more seals, the more the force can be distributed and the more resistant to breakage. On the other hand, for the easy-open property in which the resin film is pulled in the outward direction, it is not necessary for the plurality of seal portions to break substantially simultaneously, and the seal portions may be broken one by one. Become. Therefore, the weaker the strength of one sealing portion, the better the ease of opening. Therefore, in the case of having a plurality of seal portions, it is possible to maintain the seal hometown as a whole while weakening the strength of each seal portion. Compatibility will be more easily achieved.

The distance between the seal portions is 0.24% or more, more preferably 0.88% or more, and still more preferably 2.2% or more with respect to 100% of the circumference of the tubular film. . Further, the distance between the seal portions is preferably 5.0% or less, more preferably 3.5% or less, and still more preferably 3.0% or less with respect to 100% of the circumference of the tubular film. is. When the distance between the seal portions is 0.24% or more, there is a tendency that the force distribution works more effectively and the sealing failure resistance is further improved. In addition, since the distance between the seal portions is 5.0% or less, the overlapping portions of the tubular films are reduced, so there is a tendency that the manufacturing cost can be further reduced.

FIG. 2 shows a schematic diagram of a cross section of the sealing portion taken along a plane perpendicular to the longitudinal direction. In this cross section, the width of the seal portion in the plane direction of the resin film is 30 μm or more and 200 μm or less, preferably 40 μm or more and 190 μm or less, and more preferably 50 μm or more and 150 μm or less. When the width of the seal portion in the surface direction of the resin film is 30 μm or more, the sealing breakage resistance tends to be further improved. In addition, when the width of the seal portion in the surface direction of the resin film is 200 μm or less, the ease of opening tends to be further improved. The width of the seal portion in the surface direction of the resin film can be adjusted by a fusion method. Examples of fusion bonding methods include ultrasonic fusion, high-frequency fusion, and heat fusion. In general, high-frequency fusion provides a seal width of 300 to 1,500 μm, whereas ultrasonic fusion provides a wider seal width. A narrow seal width is obtained. Therefore, it is preferable that the seal width of the seal portion is formed by ultrasonic fusion.

As shown in FIG. 2, it is preferable that the outer ear side of the seal portion 2a is recessed like a notch 2' in a cross section obtained by cutting the seal portion 2a along a plane perpendicular to the longitudinal direction. As a result, the seal portion is easily peeled off starting from the dent according to the force in the peeling direction (outward direction of the tubular package), and the ease of opening tends to be further improved.

The 180-degree peel strength of one seal portion is 10 N or less, preferably 7.5 N or less, and more preferably 5 N or less. Also, the lower limit of the 180-degree peel strength of the seal portion is not particularly limited, but can be set to 1N or more. When the 180-degree peel strength of the seal portion is 10 N or less, the ease of opening is further improved. In addition, since the 180-degree peel strength of the seal portion is 1 N or more, there is a tendency that the seal breakage resistance is further improved.

The shear peel strength of one seal portion is 35 N or more, preferably 40 N or more, and more preferably 45 N or more. Also, the upper limit of the shear peel strength of the seal portion is not particularly limited, but can be 100 N or less. When the shear peel strength of the seal portion is 35 N or more, the resistance to seal breakage is further improved. In addition, when the shear peel strength of the seal portion is 100 N or less, the ease of opening tends to be further improved.

When the 180-degree peel strength and the shear peel strength are measured for a cylindrical package having two or more seals, strength peaks corresponding to the number of seals are observed in one measurement. Each observed strength peak corresponds to the 180 degree peel strength and the shear peel strength of each seal. Therefore, each strength peak observed can be defined as "180-degree peel strength of one seal portion" and "shear peel strength of one seal portion", respectively.

(resin)
The resin film may be a single layer film or a multilayer film. The resin constituting the resin film is not particularly limited, but examples include vinylidene chloride copolymer, vinylidene chloride homopolymer, ethylene-vinyl alcohol copolymer, polyamide resin, polyolefin resin, polyvinyl chloride, polystyrene. resin. Among these, vinylidene chloride copolymers, vinylidene chloride homopolymers, and polyamide resins are preferred, and vinylidene chloride copolymers and polyamide resins are more preferred, from the viewpoints of easy-openability and resistance to seal breakage.

(Vinylidene chloride copolymer)
A vinylidene chloride copolymer is a copolymer of a vinylidene chloride monomer and a monomer copolymerizable therewith. The monomer copolymerizable with the vinylidene chloride monomer is not particularly limited, but examples include vinyl chloride; acrylic esters such as methyl acrylate and butyl acrylate; acrylic acid; methyl methacrylate, butyl methacrylate, and the like. methacrylic acid ester of; methacrylic acid; methyl acrylonitrile; vinyl acetate; Among these, vinyl chloride, methyl acrylate, and methyl acrylonitrile are preferred from the viewpoint of the balance between water vapor impermeability and oxygen impermeability and extrusion processability. These copolymerizable monomers may be used singly or in combination of two or more.

The comonomer content of the vinylidene chloride-acrylic acid ester copolymer, vinylidene chloride-methacrylic acid ester copolymer, and vinylidene chloride-methylacrylonitrile copolymer is preferably 1 to 40% by mass, more preferably 1 to 35. % by mass, more preferably 2 to 25% by mass, still more preferably 2 to 15.5% by mass, even more preferably 4 to 15% by mass, particularly preferably 5 to 15% by mass is. When the comonomer content of the vinylidene chloride copolymer is 1% by mass or more, the melting property during extrusion tends to be further improved. Moreover, when the comonomer content of the vinylidene chloride copolymer is 40% by mass or less, the water vapor impermeability and the oxygen impermeability tend to be further improved.

The comonomer (vinyl chloride) content of the vinylidene chloride-vinyl chloride copolymer is preferably 1 to 40% by mass, more preferably 1 to 30% by mass, and still more preferably 1 to 25% by mass. Yes, more preferably 3.5 to 25% by mass, still more preferably 4 to 25% by mass, and particularly preferably 5 to 25% by mass. When the comonomer content of the vinylidene chloride copolymer is 1% by mass or more, the melting property during extrusion tends to be further improved. Moreover, when the comonomer content of the vinylidene chloride copolymer is 40% by mass or less, the water vapor impermeability and the oxygen impermeability tend to be further improved.

The weight average molecular weight (Mw) of the vinylidene chloride copolymer is preferably 50,000 to 150,000, more preferably 60,000 to 130,000, still more preferably 70,000 to 125,000. be. When the weight average molecular weight (Mw) is 50,000 or more, the melt tension required for molding tends to be further improved. Further, when the weight average molecular weight (Mw) is 150,000 or less, melt extrusion tends to be possible while maintaining thermal stability. In the present embodiment, the weight average molecular weight (Mw) can be determined by gel permeation chromatography (GPC method) using a standard polystyrene calibration curve.

(ethylene-vinyl alcohol copolymer)
The comonomer (vinyl alcohol) content of the ethylene-vinyl alcohol copolymer is preferably 35 to 60 mol%, more preferably 38 to 58 mol%, still more preferably 38 to 54 mol%, and more More preferably 39 to 49 mol %, particularly preferably 41.5 to 46.5. When the comonomer content is within the above range, the oxygen impermeability tends to be further improved. The degree of saponification of the ethylene-vinyl alcohol copolymer is preferably 98-100 mol %, more preferably 99-100 mol %. When the degree of saponification is within the above range, the oxygen impermeability tends to be further improved.

(polyamide resin)
Examples of polyamide resins include, but are not limited to, polycaproamide (nylon 6), polydodecanamide (nylon 12), polytetramethylene adipamide (nylon 46), and polyhexamethylene adipamide (nylon 66). , polyundecamethylene adipamide (nylon 116), polymetaxylylene adipamide (nylon MXD6), polyparaxylylene adipamide (nylon PXD6), polytetramethylene sebacamide (nylon 410), polyhexamethylene Sebacamide (nylon 610), polydecamethylene adipamide (nylon 106), polydecamethylene sebacamide (nylon 1010), polyhexamethylene dodecamide (nylon 612), polydecamethylene dodecamide (nylon 1012), Polyhexamethylene isophthalamide (nylon 6I), polytetramethylene terephthalamide (nylon 4T), polypentamethylene terephthalamide (nylon 5T), poly-2-methylpentamethylene terephthalamide (nylon M-5T), polyhexamethylene hexa Hydroterephthalamide (nylon 6T (H)) polynonamethylene terephthalamide (nylon 9T), polydecamethylene terephthalamide (nylon 10T), polyundecamethylene terephthalamide (nylon 11T), polydodecamethylene terephthalamide (nylon 12T) , polybis(3-methyl-4-aminohexyl)methane terephthalamide (nylon PACMT), polybis(3-methyl-4-aminohexyl)methane isophthalamide (nylon PACMI), polybis(3-methyl-4-aminohexyl) Methandodecamide (nylon PACM12), polybis(3-methyl-4-aminohexyl)methane tetradecamide (nylon PACM14) and the like. Among these, partially aromatic polyamides such as poly-meta-xylylene adipamide (nylon MXD6) are preferred from the viewpoint of oxygen barrier properties.

(polyolefin resin)
Examples of polyolefin resins include, but are not limited to, polyethylene, polypropylene, ethylene-α-olefin copolymers, and ethylene-vinyl acetate copolymers.

Examples of polyethylene include, but are not limited to, low-density polyethylene having a density of 0.910 to 0.930 g/cm ³ and high-density polyethylene having a density of 0.942 g/cm ³ or higher. Moreover, the polypropylene is not particularly limited, but includes, for example, homopolypropylene and random polypropylene.

The content of vinyl acetate in the ethylene-vinyl acetate copolymer is preferably 1 to 35% by mass, more preferably 5 to 30% by mass, relative to 100% by mass of the ethylene-vinyl acetate copolymer. , more preferably 10 to 25% by mass, particularly preferably 15 to 20% by mass. When the content of vinyl acetate is within the above range, the interlayer adhesive strength tends to be further improved in the case of a multilayer structure.

The film outer lug protruding in a band shape outside the tubular film has one or more rows of scar groups in which a plurality of non-penetrating or penetrating holes or cuts are formed in a row. The scar group is provided to adjust the easiness of cutting into the tubular film. It becomes possible to easily cut by hand starting from the part. With such a configuration, it is possible to further promote peeling of the seal portion by utilizing cutting of the film. (Figures 4-5)

FIG. 4 shows a film 1 and a sealing portion 2, and in a tab portion 3, a row of micro-area holes 4 linearly provided at small intervals in a direction transverse to the tab axis. 2 shows cylindrical packages provided in multiple directions. FIGS. 5(i) and 5(ii) are diagrams respectively showing preferred examples of holes or cuts 5a. The holes or cuts 5a do not penetrate the film layer and are formed in a line at substantially constant intervals b in a direction transverse to the longitudinal axis of the package to form a group of scars 5, and the group of scars 5 They are arranged in a plurality of rows at substantially constant intervals c in the longitudinal direction of the package. The hole or cut 5a has an area of 0.003 mm2 to 0.2 mm2, a length in the direction perpendicular to the longitudinal direction of the package 10 (length a in FIG. 5) of 0.1 mm to 1.5 mm, and a group of scars. 5 (interval b in FIG. 5) is 0.1 mm to 1 mm, the interval between scar groups 5 (interval c in FIG. 5) is 0.5 mm to 2 mm, the width in the longitudinal direction of package 10 (FIG. 5 It is preferable to form the inner width d) to be 0.005 mm to 0.5 mm.

[Manufacturing method of cylindrical package]
The method for manufacturing the cylindrical package is not particularly limited, but includes a step of overlapping both side edges of a strip-shaped resin film so that the front and back surfaces of the resin film face each other, and and fusing in the longitudinal direction.

The fusion bonding method is not particularly limited as long as it is a method capable of obtaining the above-described sealed portion, but ultrasonic fusion is preferred.

The fusion energy in ultrasonic fusion is proportional to the amplitude of the ultrasonic wave, the pressing force between the ultrasonic horn and the anvil, and the processing time. It can be easily controlled, and can easily form a tubular film having airtightness and excellent easy-openability.

The larger the amplitude of the ultrasonic wave in the ultrasonic fusion, the higher the heating energy and the easier the fusion. The amplitude of ultrasonic waves is preferably 10 μm or more and 60 μm or less. If the amplitude is less than 10 μm, the heating energy is too low, resulting in insufficient fusion, and after packaging, the bag is likely to break (puncture) during, for example, retort processing. On the other hand, if the amplitude exceeds 60 μm, the heating energy becomes too high, and the easy-openability tends to be insufficient. In addition to this, the resin film is excessively melted and the thickness of the resin film at the sealed portion becomes thin.

The higher the pressing force between the ultrasonic horn and the anvil, the higher the heating energy and the easier the fusion. Both pressing forces are preferably 5N or more and 70N or less. When the pressing force is less than 5 N, the heating energy is too low, resulting in insufficient fusion, and after packaging, the bag is likely to break (puncture) during, for example, retort processing. On the other hand, when the pressing force exceeds 70 N, the heating energy becomes too high, and the easy-openability tends to be insufficient. In addition to this, the resin film is excessively melted and the thickness of the resin film at the sealed portion becomes thin.

The above ultrasonic conditions may be appropriately adjusted depending on the film thickness, material (amorphous/crystalline, and thermal properties such as melting point) and bag-making speed so as to obtain an appropriate sealing strength. By continuously controlling the ultrasonic contact pressure and amplitude to keep the ultrasonic output constant, it becomes easier to keep the strength of the seal portion constant.

Hereinafter, the present invention will be described more specifically using examples and comparative examples. The present invention is by no means limited by the following examples.

[Measurement method of 180 degree peel stress]
ASTM F-88 FIG. 1 LAP SEAL. That is, a strip-shaped test piece having a width of 15 mm and a length of 50 mm, in which the fused portion exists approximately in the center in the longitudinal direction (the fusion line is perpendicular to the longitudinal direction of the strip at approximately the center in the longitudinal direction). existing) were cut from the tubular package. The 180-degree peel stress was measured using a Tensilon universal tester (trade name: RTC-1210, manufactured by Orientec Co., Ltd.). At this time, the test piece was held by two upper and lower film chucks so that the test piece was pulled vertically with the fused portion as a base point. The distance between the film chucks at the initial stage of measurement was set to 10 mm, and the 180 degree peel strength of the fused portion was measured under the conditions of a tensile speed of 300 mm/min (one measurement/one test piece). The average value of the degree peel stress was calculated.

[Shear peel strength]
The shear peel strength of the seal portion of the resin film is measured using a Tensilon universal material tester manufactured by Orientec Co., Ltd. for the cylindrical film, and the longitudinal direction of the film is symmetrical with respect to the vertical seal portion. Two parts of the body of the part were clamped with clamps of a testing machine with a length of 15 mm along the longitudinal direction, and the strength when peeled at a tensile speed of 300 mm / min was measured at a temperature of 23 ° C. (n = 3. Unit) :N).

[Evaluation of retort resistance]
One end of the cylindrical package obtained in Examples and Comparative Examples is closed with an aluminum steel wire, the cylindrical package is filled with minced fish sausage, and the other end is closed with an aluminum steel wire, Got the package. 10,000 packages were prepared, and a high-temperature and high-pressure cooking and sterilization apparatus (hot water storage/rotary type: 130 type) manufactured by Hisaka Seisakusho Co., Ltd. was used, and the gauge pressure in the heating can was 0.20 MPa. Retort treatment was performed at 120° C. for 20 minutes under the following conditions.

The retort puncture rate (bag breakage rate) was calculated from the following formula by counting the number of packages that were completely broken at the sealed portion among the packages after the retort treatment, and the value was obtained by rounding to the first decimal place. Based on the obtained values, retort resistance was evaluated according to the following criteria.
Retort puncture rate (%) = (number of broken bags/10,000) x 100
◎: Retort puncture rate is less than 0.02% ○: Retort puncture rate is 0.02% or more and less than 0.1% ×: Retort puncture rate is 0.1% or more

[Ease of opening test]
Among the packages after the retort treatment, 500 packages in which delamination or puncture did not occur were randomly sampled. A sensory test was conducted to evaluate the degree of force required to open the obtained sample by picking up the outer ear piece and manually opening the package. Specifically, 50 panelists each opened 10 package samples and evaluated each package with a sensory test score of 0 to 2 points.
2 points: Anyone can easily open the package 1 point: Anyone can open the package with force 0 points: The package cannot be opened with bare hands

The evaluation score was obtained by rounding the average value of the sensory test scores of a total of 500 pieces to the second decimal place. Based on the evaluation points obtained, the easy-openability was evaluated according to the following criteria.
◎: Average sensory test score is 2.0
○: The average sensory test score is 1.5 or more and less than 2 △: The average sensory test score is 1 or more and less than 1.5 ×: The average sensory test score is less than 1

[Sealing resistance test: drop test]
Among the packages after the retort treatment, 500 packages in which delamination or puncture did not occur were randomly sampled. The resulting sample was vertically dropped from a height of 1 m with the sealed portion facing downward 10 times, and the film was visually judged for damage such as tearing and pinholes. This test was performed on all 500 bags, and the bag breakage rate was calculated from the following formula, and the value rounded to the first decimal place was evaluated according to the following criteria.
Bag breaking rate (%) = (Number of broken bags / 500) x 100
◎: Bag breakage rate is less than 0.4% ○: Bag breakage rate is 0.4% or more and less than 0.6% △: Bag breakage rate is 0.6% or more and less than 1.0% ×: Bag breakage rate is 1 .0% or more

[Example 1]
PVDC-PVC copolymer I (vinylidene chloride content 89.8% by mass, M _w = 122000) was melted and extruded through an annular die to produce an annular film, and the insides of the annular films were overlapped to obtain a thickness of 43 μm. A strip-shaped PVDC film (thickness of two films having a thickness of 21.5 μm) was obtained. Next, a series of impenetrable holes (also referred to as cuts) having a depth of 20 to 70% of the thickness of the film was formed on both side edges of the film as shown in FIG. 5(i). The length a, spacing b, spacing c and width d shown in FIG. 5(i) were 0.7 mm, 0.5 mm, 1 mm and 0.02 mm, respectively. The total area of cuts was 0.01 mm ² . This belt-shaped film made of PVDC was rolled into a tubular shape so that both side edges extending in the longitudinal direction were overlapped to form a tubular film. While the tubular film was traveling downward, the overlapping side edges of the tubular film were pressed under the conditions of a pressing force of 50 N between the ultrasonic horn and the anvil and a fusion energy of 20 W (indicated as power on the equipment). By passing through a set ultrasonic sealing type automatic filling and packaging machine (“ADP (registered trademark)” manufactured by Asahi Kasei Corporation), two side edges of the cylindrical film are vertically sealed, and the film is longitudinally sealed. A tubular package made of PVDC and having a longitudinal seal portion with an extending outer ear portion having a width of 4 mm was obtained. The interval between the two seal portions was 2.2% of the circumference, and the seal width was 145 μm. The table shows the evaluation results of various performance evaluations.

[Examples 2 and 3]
PVDC-PVC copolymer II (vinylidene chloride content 74% by mass, M _w =122000) instead of PVDC-PVC copolymer I (vinylidene chloride content 89.8% by mass, M _w =122000), or PVDC A cylindrical package was obtained in the same manner as in Example 1, except that PVC copolymer III (vinylidene chloride content: 70% by mass, M _w =122,000) was used. The table shows the evaluation results of various performance evaluations.

[ Reference Examples 4-5]
Cylindrical packages were obtained in the same manner as in Example 1, except that the intervals between the two seal portions were set to 0.88% and 0.24% of the circumference, respectively. The table shows the evaluation results of various performance evaluations.

[ Reference Examples 6 to 7]
Cylindrical packages were obtained in the same manner as in Example 1, except that the seal widths were 164 μm and 195 μm, respectively. The table shows the evaluation results of various performance evaluations.

[Example 8]
Instead of PVDC-PVC copolymer I (vinylidene chloride content 89.8% by mass, M _w = 122000), PVDC-MA copolymer polymer VI (vinylidene chloride content 85% by mass, M _w = 80000) was used. A cylindrical package was obtained in the same manner as in Example 1 except for the above. The table shows the evaluation results of various performance evaluations.

[Example 9]
PVDC-MA copolymer polymer V (vinylidene chloride content 84.6% by weight, M _w =80000) instead of PVDC-PVC copolymer I (vinylidene chloride content 89.8% by weight, M _w =122000) A cylindrical package was obtained in the same manner as in Example 1 except that the was used. The table shows the evaluation results of various performance evaluations.

[Example 10]
PVDC-MA copolymer polymer VI (vinylidene chloride content 80% by mass, M _w =80000) was used instead of PVDC-PVC copolymer I (vinylidene chloride content 89.8% by mass, M _w =122000). A cylindrical package was obtained in the same manner as in Example 1 except for the above. The table shows the evaluation results of various performance evaluations.

[Example 11]
Instead of the PVDC film, a laminated film with a thickness of 56 μm obtained by laminating polypropylene on both sides of an MXD nylon resin film via an adhesive polypropylene was processed into a group of scars in the same manner as in Example 1, and ultrasonic waves were applied. A cylindrical package was obtained in the same manner as in Example 1 except that the pressing force between the ultrasonic horn and the anvil was set to 50 N and the fusion energy was set to 35 W for sealing. The table shows the evaluation results of various performance evaluations.

[Example 12]
A cylindrical package was obtained in the same manner as in Example 11, except that a nylon-based multilayer film (Barrieron MF: manufactured by Asahi Kasei Corp.) was used instead of the laminated film. The table shows the evaluation results of various performance evaluations.

[Example 13]
A cylindrical package was obtained in the same manner as in Example 11, except that a film made of ethylene-vinyl alcohol copolymer VII (comonomer content: 45%) was used instead of the laminated film. The table shows the evaluation results of various performance evaluations.

[Example 14]
A cylindrical package was obtained in the same manner as in Example 1, except that the number of seal lines in the longitudinal direction was set to three. The interval between the three seal portions was 0.88% of the circumference, and the seal width was 145 μm. The table shows the evaluation results of various performance evaluations.

[Example 15]
A cylindrical package was obtained in the same manner as in Example 1, except that both side edges were not scarred. The table shows the evaluation results of various performance evaluations.

[Comparative Example 1]
A cylindrical package was obtained in the same manner as in Example 1, except that one seal line was used. Various evaluation results are shown in the table.

[Comparative Example 2]
A cylindrical package was obtained in the same manner as in Example 1, except that the seal width was 300 μm. Various evaluation results are shown in the table.

[Comparative Example 3]
A cylindrical package was obtained in the same manner as in Example 1, except that the seal width was 20 μm. Various evaluation results are shown in the table.

[Comparative Example 4]
A cylindrical package was obtained in the same manner as in Example 1, except that the distance between the seal portions was 0.15%. The evaluation results are shown in the table.

INDUSTRIAL APPLICABILITY The cylindrical package of the present invention has industrial applicability as a cylindrical package for containing ham, sausage, cheese, sweet bean jelly, uiro, and the like.

Claims (4)

a tubular film obtained by overlapping both side edges of a strip-shaped resin film so that the front and back surfaces of the resin film face each other;
and two or more seal portions obtained by fusing the overlapping portions of the tubular film in the longitudinal direction of the film,
In a cross section obtained by cutting the seal portion along a plane perpendicular to the longitudinal direction, the width of the seal portion in the surface direction of the resin film is 30 μm or more and 150 μm or less,
The distance between the seal portions is 2.2 % or more and 3.5% or less of the circumference of the tubular film,
The seal portion has a 180-degree peel strength of 10 N or less and a shear peel strength of 35 N or more.
Cylindrical package. The resin film contains a vinylidene chloride-based copolymer resin and/or a polyamide-based resin,
The cylindrical package according to claim 1. wherein the sealing portion is formed by ultrasonic fusion;
The cylindrical package according to claim 1 or 2. At least one row of scar groups in which a plurality of non-penetrating or penetrating holes or cuts are formed in a row in the film outer lug protruding in a band shape outside the tubular film,
The tubular package according to any one of claims 1 to 3.

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