JP6334391B2 - Cylindrical package - Google Patents

Description

  The present invention relates to a cylindrical package having a processed food such as cheese, sausage, kamaboko, and ham as a filler.

  As a sealing means for sealing individual tubular films filled with processed foods such as cheese, sausage, kamaboko, ham and the like to obtain individual packages, a method of focusing and sealing the ends of the tubular films has been known. Thus, in the cylindrical package obtained by the method of focusing and sealing the end portions of the cylindrical film, there is a problem that pinholes are likely to occur at or near the seal portion. Therefore, in order to solve such a problem, a method in which both end portions in the longitudinal direction of the cylindrical base film are focused and sealed, and a reinforcing tape is welded to the focused and sealed portion of the base film is performed. It has become. However, the cylindrical package obtained by the method of welding the reinforcing tape to the focus-sealed portion of the base material film is not necessarily sufficient in terms of pinholes in the cylindrical film and the sealing performance of the package. .

  For this reason, JP 2009-46148 A (Patent Document 1) describes a filler and a cylindrical base material film filled with the filler by focusing and sealing at both ends in the longitudinal direction; In a cylindrical package comprising a reinforcing tape welded to the base material film so as to wind and cover a portion of the base material film that has been tightly sealed, the heat shrinkage rate and tensile secant elasticity before welding of the reinforcing tape It is described that by setting the rate within a specific range, the occurrence of pinholes in the tubular film is sufficiently suppressed and the sealing performance is improved.

  However, this is mainly due to the study of reinforcing tape, leaving room for examination of the base material film. There is a limit to improving the sealing performance of welded reinforcing tape, especially the sealing performance of the welded portion of the reinforcing tape (hereinafter referred to as “clip part”). There was a need for simple means.

JP 2009-46148 A

  This invention is made | formed in view of the subject which the said prior art has, and aims at providing the cylindrical package body excellent in the sealing performance of a clip part.

  As a result of intensive studies to achieve the above object, the present inventors have filled (A) the filling material and (B) the filling material by focusing and sealing both ends in the longitudinal direction. A cylindrical base material film made of a polyvinylidene chloride resin film; and (C) a polyvinylidene chloride system that is welded to the base material film so as to wind and cover the portion where the base material film is focused and sealed. In a cylindrical package including a reinforcing tape made of a resin film, as the base material film, by using a polyvinylidene chloride resin film having a specific range of acetone extraction rate, piercing energy, and heat shrinkage rate, It has been found that the sealing performance of the clip portion of the cylindrical package is improved, and the present invention has been completed.

That is, the cylindrical package of the present invention is made from (A) a filler and (B) a polyvinylidene chloride resin film filled with the filler by focusing and sealing both ends in the longitudinal direction. A cylindrical base material film, and (C) a reinforcing tape made of a polyvinylidene chloride resin film, which is welded to the base material film so as to wind and cover a portion where the base material film is converged and sealed A cylindrical package comprising:
The heat shrinkage ratio RB _-TD at 100 ° C. in the short direction of the base material film before the focusing seal is in the range of 10.0 to 18.9%, the acetone extraction rate is 9.0% or less, and 120 The piercing energy at ° C. is 2.1 mJ or more.

In the cylindrical package of the present invention, the heat shrinkage ratio RB _-TD at 100 ° C. in the short direction of the base material film before the convergence seal and the heat shrinkage rate at 100 ° C. in the longitudinal direction of the reinforcing tape before welding. R _C-MD is the following formula (F1):
−8% ≦ R _B-TD −R _C-MD ≦ 9% (F1)
It is preferable to satisfy the condition represented by the following formula (F1a):
4.5% ≦ RB _{-TD- RC-MD} ≦ 6.5% (F1a)
It is more preferable that the condition represented by

Furthermore, in the cylindrical package of the present invention, the piercing energy at 120 ° C. of the base material film before the focusing seal is preferably 2.5 mJ or more, and the length of the base film before the focusing seal is increased. It is also preferable that the tensile secant modulus EB _-MD in the direction is in the range of 332 to 450 MPa.

  Further, in the cylindrical package of the present invention, the base material film is preferably composed of a polyvinylidene chloride resin film containing a copolymer of vinylidene chloride monomer and vinyl chloride monomer, and the reinforcement The tape is preferably made of a film of a polyvinylidene chloride resin containing a copolymer of vinylidene chloride monomer and vinyl chloride monomer.

  According to the present invention, it is possible to obtain a cylindrical package with excellent clip portion sealing performance.

  Hereinafter, the present invention will be described in detail with reference to preferred embodiments thereof.

The tubular package of the present invention comprises (A) a filling and (B) a tube made of a polyvinylidene chloride resin film filled with the filling by focusing and sealing both ends in the longitudinal direction. And (C) a reinforcing tape made of a polyvinylidene chloride-based resin film welded to the base film so as to wind and cover a portion where the base film is converged and sealed. A tubular package,
The heat shrinkage ratio RB _-TD at 100 ° C. in the short direction of the base material film before the focusing seal is in the range of 10.0 to 18.9%, the acetone extraction rate is 9.0% or less, and 120 The piercing energy at ° C. is 2.1 mJ or more.

  Although it does not specifically limit as (A) filling concerning this invention, For example, processed foods, such as cheese, sausage, kamaboko, and ham, are mentioned.

(Base material film)
The base material film (B) according to the present invention has a cylindrical shape filled with the filler by converging and sealing both end portions in the longitudinal direction. And the base material film concerning this invention needs to consist of a polyvinylidene chloride resin film. In this specification, the polyvinylidene chloride resin (hereinafter abbreviated as “PVDC resin”) refers to a copolymer resin mainly composed of vinylidene chloride. Since such a PVDC-type resin is excellent in the barrier | blocking property of oxygen and water vapor | steam, when used as a base material film, deterioration, such as oxidation of a filler and a loss, can maintain commercial value. Moreover, since such a PVDC-type resin is excellent also in hot fill aptitude and the high temperature sterilization process like a boil and a retort, it is the cylindrical package body which uses processed foods, such as cheese, sausage, kamaboko, and ham, as a filler. It is particularly suitable as a base material film material.

In the base material film according to the present invention, the heat shrinkage ratio RB _-TD at 100 ° C. in the short-side direction (TD) before the focusing seal needs to be in the range of 10.0 to 18.9%. If the thermal shrinkage ratio R _B-TD is less than 10.0%, the shrinkage at the time of retort is insufficient, so that wrinkles occur in the cylindrical package. On the other hand, if it exceeds 18.9%, the sealing property of the clip portion is reduced. descend. Moreover, from the viewpoint that wrinkles are less likely to occur in the cylindrical package by sufficiently shrinking during retorting, the heat shrinkage rate RB _-TD is preferably 15.0 to 18.9%. In addition, the thermal contraction rate of the base material film before such focusing sealing can be adjusted as appropriate by controlling the draw ratio during film formation.

  Further, in the base material film according to the present invention, the acetone extraction rate before the focusing seal needs to be 9.0% or less. If the acetone extraction rate of the base material film exceeds 9.0%, the melt viscosity of the PVDC resin that is the material of the base material film according to the present invention is greatly reduced, and the base film is converged with the reinforcing tape. When sealing, the strong fusion cannot be performed, and the sealing performance of the clip portion is lowered. Further, from the viewpoint that the sealing performance of the clip portion is further improved, the acetone extraction rate of the base material film before the focusing seal is preferably 6.0% or less, and preferably 4.0% or less. Is more preferable, and 3.0% or less is particularly preferable. In addition, although there is no restriction | limiting in particular as a lower limit of acetone extraction rate, 1.0% or more is preferable from a viewpoint of the extrudability of a film. Moreover, the acetone extraction rate of the base material film before such a focusing seal is appropriately adjusted by controlling the temperature and reaction time when polymerizing the PVDC resin that is the material of the base material film according to the present invention. be able to.

  Furthermore, in the base material film according to the present invention, the piercing energy before the focusing seal needs to be 2.1 mJ or more. When the piercing energy of the base material film is less than 2.1 mJ, the base material film cannot withstand the film shrinkage stress at the time of retorting, and pinholes may be generated in the clip portion, thereby reducing the sealing performance of the clip portion. Further, from the viewpoint that the sealing performance of the clip portion is further improved, the piercing energy of such a base material film before the focusing seal is preferably 2.5 mJ or more, more preferably 2.8 mJ or more. Preferably, it is 3.2 mJ or more, more preferably 3.5 mJ or more. In addition, the piercing energy of the base material film before the convergence seal is controlled by controlling the molecular weight of the PVDC resin that is the material of the base material film according to the present invention, the vinylidene chloride / vinyl chloride copolymerization ratio, and the like. It can be adjusted appropriately.

In the base material film according to the present invention, the tensile secant modulus E _B-MD in the longitudinal direction (MD) before the bundling seal is preferably in the range of 332 to 450 MPa, and in the short direction (TD). The tensile secant modulus EB _-TD is preferably in the range of 220 to 370 MPa. If the tensile secant modulus E _{B-MD in the} longitudinal direction or the tensile secant modulus E _{B-TD in the} short direction is less than the lower limit, the base film does not have sufficient strength. On the other hand, when the above upper limit is exceeded, the mounting property (fit property) of the reinforcing tape is lowered, and the reinforcing tape may not be welded to the base material film, and the resulting cylindrical package is sealed. May decrease. In addition, the tensile secant modulus of the base material film before such convergent sealing can be appropriately adjusted by controlling the addition amount of additives such as vinylidene chloride / vinyl chloride copolymerization ratio and plasticizer.

  The thickness of the base material film according to the present invention before the focusing seal is not particularly limited, but is preferably in the range of 20 to 80 μm, and more preferably in the range of 30 to 60 μm. If the thickness is less than the lower limit, the resulting cylindrical package tends to easily cause pinholes due to external impact or friction during transportation or the like, and on the other hand, if the upper limit is exceeded, Insufficient bundling, and a part that does not weld including the reinforcing tape is generated, and the sealing property of the obtained cylindrical package tends to be insufficient.

  The PVDC resin, which is the material of the base film according to the present invention, can be obtained by copolymerizing vinylidene chloride and a monomer other than vinylidene chloride. Such a monomer other than vinylidene chloride is not particularly limited, and examples thereof include vinyl chloride, acrylonitrile, and (meth) acrylic acid esters.

  Moreover, such PVDC-type resin contains 78 to 84% by mass of vinylidene chloride (more preferably 79 to 83% by mass, particularly preferably 80 to 82% by mass) and 22 to 16% by mass of vinyl chloride (more preferably). 21 to 17% by mass, and particularly preferably 20 to 18% by mass). When the blending amount of vinylidene chloride is less than the lower limit, crystallization does not proceed sufficiently during melt extrusion stretch film formation, and stable film formation tends to be difficult, and the obtained base material film has heat resistance. When the upper limit is exceeded, the melting point increases due to the increase in crystallinity, which tends to cause a problem that the tubular package obtained by high-temperature heat treatment such as retort sterilization is ruptured. Therefore, the load of melt extrusion tends to increase.

  You may mix | blend another resin with the PVDC-type resin which is the material of the base material film concerning this invention as needed. Examples of such other resins include ethylene-vinyl acetate copolymer, (meth) acrylic acid ester (preferably a copolymer of (meth) acrylic acid alkyl ester having 1 to 18 carbon atoms in the alkyl group). (For example, methyl (meth) acrylate-butyl (meth) acrylate copolymer)), methyl methacrylate-butadiene-styrene copolymer), and the like. Such other resin may be added to the PVDC resin to form a PVDC resin composition, or a part or all of the resin may be preliminarily blended in the coloring resin composition containing the pigment, and the coloring resin composition. You may mix | blend a thing with a PVDC-type resin. Further, from the viewpoint of gas barrier properties, heat resistance, and the like, such other resins are preferably blended so that the content ratio of the vinylidene chloride component in the mixture with the PVDC resin is 50% by mass or more.

  Furthermore, in order to impart properties such as melt extrudability, thermal stability, stretchability, flexibility, coloring, and releasability from fillers to the PVDC resin that is the material of the base film according to the present invention, Additives such as a plasticizer, a stabilizer, a lubricant, a colorant, a surfactant, and a finishing agent may be added. In addition, recyclable PVDC resin composition molding waste generated during molding can be mixed with the PVDC resin.

  Examples of the additive include known plasticizers, stabilizers, pressure-sensitive adhesives, tackifiers, pigments, lubricants, auxiliaries, fillers, and surfactants. Examples of the liquid plasticizer include acetyl tributyl cytolate (ATBC), glycerin diacetyl monolaurate (GDAML), dibutyl sebacate (DBS), dioctyl sebacate and diacetylated monoglyceride (DALG). Stabilizers include epoxidized vegetable oils (eg, epoxidized soybean oil (ESBO), epoxidized linseed oil (ELO)), amide derivatives of alkyl esters, magnesium hydroxide, tetrasodium pyrophosphate, and the like. Examples of the pressure-sensitive adhesive include polypolybutyl alcohol such as polyisobutylene (PIB), polybutene (PB), polybutadiene, polyethylene glycol, polyglycerin, and polypropylene glycol. Tackifiers include sorbitan fatty acid esters, propylene glycol fatty acid esters, glycerin fatty acid esters (for example, surfactants such as sorbitan mono (tri) oleate and glycerin mono (tri) oleate), paraffinic or cycloparaffinic liquid saturation Examples thereof include hydrocarbons (for example, naphthenic process oil, paraffin wax, liquid paraffin (mineral oil)) and the like. Examples of lubricants include waxes (eg, polyethylene oxide, paraffin wax), saturated fatty acid amides (eg, butyramide, valeric acid amide, caproic acid amide, strong prillic acid amide, strong purine amide, lauric acid amide, myristic acid amide, Palmitic acid amide, stearic acid amide, arachidic acid amide, behenic acid amide), unsaturated fatty acid amide (eg, oleic acid amide, ergic acid amide), sorbitan fatty acid ester, polyglycerin fatty acid ester, substituted amide (eg, N- Oleyl palmitic acid amide, N-stearyl stearic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide), methylol amide (for example, methylol stearic acid amide), saturated fat Acid bisamide (eg, methylene bis stearic acid amide, ethylene bishydroxy stearic acid amide), unsaturated fatty acid bisamide (eg, ethylene bisphenol acid amide), aromatic bisamide (eg, m-xylylene bishydroxy stearic acid amide) ) And the like. As the auxiliary agent, ethylene-vinyl acetate copolymer, phenol antioxidant (for example, 2,6-di-tert-butyl-4-methyl-phenol (BHT), triethylene glycol-bis [3- (3 -Tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 2,4-dimethyl-6-S monoalkylphenol, 2,4-dimethyl-6- (1-methylpentadecyl) phenol, and mixtures thereof ), Thioether antioxidants (eg, thiodipropionic acid, distearyl thiodipropionate), phosphite antioxidants (eg, trisnonylphenyl phosphite, distearyl pentaerythritol diphosphite), etc. . Examples of the filler include silicon dioxide, calcium carbonate, and zeolite. Examples of the surfactant include sorbitan fatty acid esters.

  As a method for producing a base film according to the present invention, for example, a method in which the PVDC resin is heated and melted by a melt extruder, extruded from a tubular nozzle, and rapidly cooled and biaxially stretched by means such as an inflation method can be employed. The stretching ratio in the machine direction (MD) in biaxial stretching is preferably 2 to 5 times, and more preferably 2.2 to 3.5 times. Moreover, it is preferable that the draw ratio of a horizontal direction (TD) is 2-5 times, and it is more preferable that it is 3.5-4.5 times. The stretching temperature is preferably about 15 to 40 ° C, more preferably about 15 to 30 ° C.

  Moreover, in the manufacturing method of the base material film concerning this invention, in order to improve the dimensional stability of a base material film, even if the stretched film is relaxed (shrinks) to the vertical direction (MD) and the horizontal direction (TD). Good. The relaxation rate in the machine direction (MD) is preferably about 1 to 20%, and more preferably about 5 to 9%. Further, the relaxation rate in the transverse direction (TD) is preferably about 1 to 20%, and more preferably about 5 to 10%. The relaxation temperature is preferably about 40 to 80 ° C, more preferably about 50 to 70 ° C.

(Reinforcing tape)
The reinforcing tape (C) according to the present invention is welded to the base material film so as to wind and cover the portion where the base material film is converged and sealed. And the reinforcement tape concerning this invention needs to consist of a polyvinylidene chloride resin film. By using a material composed of a polyvinylidene chloride resin film as the reinforcing tape, the weldability between the reinforcing tape and the base material film is increased.

In the reinforcing tape according to the present invention, the thermal shrinkage ratio _RC-MD at 100 ° C in the longitudinal direction (MD) before welding is preferably in the range of 10 to 27%, and in the range of 12 to 25%. It is more preferable that it is in the range of 13 to 24%. When the heat shrinkage ratio R _C-MD is within the above range, the balance between the sealing property of the obtained cylindrical package and the dimensional change as the reinforcing tape becomes good. On the other hand, if the heat shrinkage ratio _RC-MD is less than the lower limit, pinholes cannot be sufficiently suppressed at both ends of the obtained cylindrical package, and the resulting cylindrical package has insufficient sealing properties. On the other hand, if the above upper limit is exceeded, shrinkage due to dimensional change and overcontraction before use as a reinforcing tape occurs, and the portion where the reinforcing tape contracts and hardens comes into contact with the surrounding packaging. It tends to induce pinholes that are damaged. Further, the thermal shrinkage ratio _RC-TD at 100 ° C. in the short direction (TD) of the reinforcing tape before welding is a clip due to poor sealing of the clip part due to shrinkage difference from the base material film or excessive shrinkage of the reinforcing tape. From the viewpoint of suppressing the shape defect of the portion, it is preferably in the range of 8 to 35%. In addition, the thermal contraction rate of the said reinforcement tape before such welding can be suitably adjusted by controlling the draw ratio etc. at the time of film forming.

In the reinforcing tape according to the present invention, the tensile secant modulus E _C-MD in the longitudinal direction (MD) before welding is preferably in the range of 250 to 450 MPa, and more preferably in the range of 260 to 420 MPa. Preferably, it is particularly preferably in the range of 270 to 400 MPa, and the tensile secant modulus E _C-TD in the short direction (TD) is preferably in the range of 220 to 370 MPa. When the tensile secant modulus E _{C-MD in the} longitudinal direction and the tensile secant modulus E _{C-TD in the} short direction are within the above ranges, the sealing property of the resulting cylindrical package and the hardness of the reinforcing tape, etc. Balance becomes good. On the other hand, if the tensile secant modulus E _C-MD in the longitudinal direction or the tensile secant modulus E _{C-TD in the} short direction is less than the lower limit, the reinforcing tape does not have sufficient hardness. When attaching a reinforcing tape to the part, the variation of the location where the reinforcing tape is attached tends to occur, and pinholes cannot be sufficiently suppressed at both ends of the obtained cylindrical package, and the resulting cylindrical shape On the other hand, when the upper limit is exceeded, the mounting property (fit property) of the reinforcing tape to the portion of the base material film that is focused and sealed decreases, and the reinforcing tape becomes the base material. There is a case where it does not weld to the film, and the sealing property of the obtained cylindrical package tends to be lowered. In addition, the tensile secant modulus of the reinforcing tape before such welding can be appropriately adjusted by controlling the amount of additive such as a plasticizer.

  The thickness of the reinforcing tape according to the present invention before welding is preferably in the range of 10 to 150 μm, more preferably in the range of 30 to 120 μm, and particularly preferably in the range of 40 to 100 μm. If the thickness is less than the lower limit, it is difficult to wind around both ends in the manufacturing process of the cylindrical package, and the strength as a reinforcing tape tends to be insufficient. On the other hand, if the thickness exceeds the above upper limit, the base film may not be welded to the portion of the base film that has been sealed, and the sealing performance of the resulting cylindrical package tends to be reduced.

  The PVDC resin, which is a material for the reinforcing tape according to the present invention, can be obtained by copolymerization with monomers other than vinylidene chloride and vinylidene chloride. Such a monomer other than vinylidene chloride is not particularly limited, and examples thereof include vinyl chloride, acrylonitrile, and (meth) acrylic acid esters. Among these, vinyl chloride is preferable from the viewpoints of excellent reactivity with vinylidene chloride and easy control of physical properties of the resulting copolymer.

  Moreover, such PVDC-type resin contains 78 to 84% by mass of vinylidene chloride (more preferably 79 to 83% by mass, particularly preferably 80 to 82% by mass) and 22 to 16% by mass of vinyl chloride (more preferably). 21 to 17% by mass, and particularly preferably 20 to 18% by mass). When the blending amount of vinylidene chloride is less than the lower limit, crystallization does not proceed sufficiently during melt extrusion stretch film formation, and it tends to be difficult to perform stable film formation, and the heat resistance of the resulting reinforcing tape When the upper limit is exceeded, the melting point increases due to the increase in crystallinity, which tends to cause a problem that the tubular package obtained by high-temperature heat treatment such as retort sterilization is ruptured. Therefore, the load of melt extrusion tends to increase.

  In order to control the thermal shrinkage rate and tensile secant modulus of the resulting reinforcing tape, the PVDC resin that is the material of the reinforcing tape according to the present invention includes, for example, a plasticizer such as dibutyl sebacate, an epoxidized vegetable oil, etc. Stabilizers, lubricants such as fatty acid esters, and maturing agents such as calcium carbonate may be added.

  The reinforcing tape according to the present invention can be obtained by, for example, heating and melting the PVDC resin with a melt extruder and extruding it from a tubular nozzle. After quenching, the film is biaxially stretched by means of an inflation method or the like. It can be manufactured by cutting into various sizes. The stretching ratio in the machine direction (MD) in biaxial stretching is preferably 2 to 5 times, and more preferably 2.2 to 3.5 times. Moreover, it is preferable that the draw ratio of a horizontal direction (TD) is 2-5 times, and it is more preferable that it is 3.5-4.5 times. The stretching temperature is preferably about 15 to 40 ° C, more preferably about 15 to 30 ° C.

  In the method for producing a reinforcing tape film according to the present invention, the stretched film may be relaxed (shrinked) in the machine direction (MD) and the transverse direction (TD) in order to increase the dimensional stability of the reinforcement tape. Good. The relaxation rate in the machine direction (MD) is preferably about 1 to 20%, and more preferably about 5 to 9%. Further, the relaxation rate in the lateral direction (TD) is preferably about 1 to 20%, and more preferably about 5 to 15%. The relaxation temperature is preferably about 40 to 80 ° C, more preferably about 50 to 70 ° C.

  The PVDC resin used in the present invention may be synthesized by any polymerization method such as suspension polymerization, emulsion polymerization, solution polymerization, etc., but in order to form a compound as a powder resin, it is 40 to 600 μm. What was obtained by the suspension polymerization method which has a particle size of a grade and does not require a grinding | pulverization process is preferable. In addition, the PVDC resin can contain an antioxidant, a plasticizer, an epoxy compound, and the like during the polymerization. The PVDC resin powder resin generally has an average particle size of about 40 to 600 μm. In the present invention, a powder resin containing an additive such as an epoxy compound or a plasticizer can be used during polymerization. Of course, even a powder resin not containing an additive such as an epoxy compound or a plasticizer can be used in the present invention. A powder resin of a PVDC resin containing an additive such as an epoxy compound or a plasticizer at the time of polymerization is added to the polymerization reaction system at least at any time before, during or after the polymerization. Then, after being contained in the produced PVDC resin, it is recovered as a powder resin.

  In the present invention, the thermal shrinkage rate of the base material film or the reinforcing tape is measured in accordance with the method described in JIS: Z1709 using the base material film or the reinforcing tape film as a sample film. That is, the sample film is marked in the longitudinal direction (MD) or the short direction (TD) so that the distance between the two points is 100 mm, immersed in boiling water at 100 ° C. for 3 minutes, and then cooled in tap water. Thereafter, the distance between the two points (that is, the distance between the two points after immersion in boiling water) d (unit: mm) is measured, and the decrease value of the distance between the two points when immersed in boiling water (100 -D) The percentage with respect to the distance of 100 mm between two points before being immersed in boiling water of mm is calculated, and this is defined as the heat shrinkage rate (unit:%) at 100 ° C. of the base material film or the reinforcing tape.

The tensile secant modulus of the base material film or the reinforcing tape is determined by the method described in JIS: K7113 item 8.5 using a tensile tester (A & D Tensilon) using the base material film or the reinforcing tape film as a sample film. It is measured in conformity. That is, after a sample film for longitudinal direction (MD) measurement or a sample film for transverse direction (TD) measurement is cut out from the base material film or the reinforcing tape film so as to have a width of 20 mm, the longitudinal direction of the sample film or A sample film is set on a tensile tester so that the test length in the short direction (distance between chucks) is 100 mm (measurement conditions: 23 ° C., 50% RH), and a tensile test is performed at a speed of 10 mm / min. Then, the specified strain: ε is set to 0.025, the stress: F (unit: N) required until the strain amount of the sample film reaches 0.025 is read, and the cross-sectional area of the sample film: S (unit: mm ^2). ) To the following relation:
(Tensile secant modulus: E) = [F / (ε × S)]
Is used to calculate the tensile secant modulus (unit: MPa) of the base material film or the reinforcing tape.

The acetone extraction rate of the base material film is measured by the following method. That is, 5 g of a base material film as a sample is dissolved by being immersed in 100 ml of tetrahydrofuran (THF) at 60 ° C. While stirring the obtained THF solution, 500 ml of methanol is added dropwise little by little to reprecipitate the sample, and then the mixed solvent is dried up at 90 ° C. Thereafter, 50 ml of methanol is added, the solution including the reprecipitated sample is put into a Soxhlet extractor, and absorbent cotton is placed on the top. Next, 70 ml of methanol is placed in a 150 ml flat bottom flask that has been dried and measured in mass, and is attached to a Soxhlet extractor and extracted at 85 ° C. for 24 hours. Place the sample after extraction into a Soxhlet extractor and place absorbent cotton on top. Next, 120 ml of acetone is placed in a flat bottom flask that has been dried and measured for mass, and is attached to a Soxhlet extractor and extracted at 75 ° C. for 24 hours. Extract the extract with filter paper no. Using 5A (according to the standard of “JIS P3801-1995 filter paper (for chemical analysis)”), 100 ml is filtered through a graduated cylinder and placed in a 150 ml flat-bottomed flask that has been dried and measured for mass. Wash the used graduated cylinder with carbon tetrachloride and add the wash to the flat bottom flask. Acetone is dried up using a Soxhlet extractor in a constant temperature water bath adjusted to 80 ° C. Thereafter, the sample was dried for 1 hour in a dryer adjusted to 105 ° C., allowed to cool in a desiccator for 1 hour, and the mass of the flat bottom flask containing the extract was determined. The acetone extraction rate (unit:%) )
Acetone extraction amount% = {(A−B) × E / (C × D)} × 100%
A: Mass (g) of a flat bottom flask containing the extract.
B: Mass (g) of a previously dried flat bottom flask.
C: Mass of the sample (g).
D: Filter paper No. 5A amount of filtered extract (100 ml).
E: Amount of acetone used for extraction (120 ml).

  The piercing energy of the base material film is measured by the following method. That is, a base material film is attached to a holding ring having an inner diameter of 45 mm, a needle of φ1 mm is pierced into the base material film at a piercing speed of 50 mm / min at a temperature of 120 ° C. (temperature during retort), and the elongation is 0 The value obtained by integrating the load from% to the breaking point by the displacement is defined as the piercing energy (unit: mJ) at 120 ° C. of the base film.

(Tubular package)
The cylindrical package of the present invention includes the filler, the base material film, and the reinforcing tape as described above. In the cylindrical package of the present invention, the heat shrinkage ratio RB _-TD at 100 ° C. in the short direction of the base material film before the convergence seal and the heat shrinkage rate at 100 ° C. in the longitudinal direction of the reinforcing tape before welding. R _C-MD is the following formula (F1):
−8% ≦ R _B-TD −R _C-MD ≦ 9% (F1)
It is preferable to satisfy the condition represented by the following formula (F1a):
4.5% ≦ RB _{-TD- RC-MD} ≦ 6.5% (F1a)
It is more preferable that the condition represented by Thus, by controlling the difference in thermal shrinkage between the base material film and the reinforcing tape, the sealing performance of the clip portion of the obtained cylindrical package tends to be improved. On the other hand, if the value of RB _{-TD- RC-MD} is less than the lower limit, the reinforcing tape shrinks excessively during high-temperature heat treatment such as retort sterilization treatment, so that it is located at the shoulder portion of the resulting cylindrical package. The end of the reinforcing tape to be turned tends to be easily turned. On the other hand, when the value of RB _{-TD- RC-MD} exceeds the upper limit, the portion of the base film that has been tightly sealed with the reinforcing tape is insufficiently tightened, and therefore the clip portion of the obtained cylindrical package body The sealing property tends to be insufficient, and the reinforcing tape tends to be easily detached from the cylindrical package.

Moreover, in the cylindrical package of the present invention, the tensile secant modulus E _{B-TD in} the short direction of the base film before the focusing seal and the tensile secant modulus E _{C in} the longitudinal direction of the reinforcing tape before welding. _-MD is the following formula (F2):
−140 MPa ≦ E _B-TD −E _C-MD ≦ 80 MPa (F2)
It is preferable to satisfy the condition represented by the following formula (F2a):
−135 MPa ≦ EB _−TD− E _C-MD ≦ −50 MPa (F2a)
It is more preferable that the condition represented by Thus, by controlling the difference between the tensile secant elastic moduli of the base film and the reinforcing tape, the sealing performance of the clip portion of the obtained cylindrical package tends to be improved. On the other hand, if the value of E _B-TD -E _C-MD is less than the lower limit, the reinforcing tape becomes too hard relative to the base film, and as a result, the reinforcing tape on the converged and sealed portion of the base film is removed. Wearability (fitness) falls, a reinforcement tape may not weld with a base material film, and it exists in the tendency for the sealing performance of the clip part of the obtained cylindrical package to fall. On the other hand, if the value of E _B-TD -E _C-MD exceeds the upper limit, the reinforcing tape is too soft with respect to the base film, and as a result, the tightly sealed portion of the base film with the reinforcing tape is tightened. Is insufficient, the sealing performance of the resulting cylindrical package tends to be reduced.

  As a method for producing such a cylindrical package of the present invention, for example, while forming the base film into a cylindrical shape, the filler is filled, and then the end of the base film is focused by ultrasonic sealing. On the other hand, it is possible to employ a method of sealing and sealing with a reinforcing tape to obtain a cylindrical package. And as an apparatus used for such a method, the product name KAP automatic filling packaging machine made from Kureha can be used, for example.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example.

Example 1
First, copolymer A (100 parts by mass) of monomer charge mass ratio (VD / VC) at the time of polymerization of vinylidene chloride (VD) and vinyl chloride (VC) is 81/19, acetyltributyl citrate (ATBC), A total of 9 parts by mass of dibutyl sebacate (DBS) and epoxidized vegetable oil was blended, and a total of 0.2 parts by mass of a surfactant, a lubricant and a satinizing agent was added to obtain a polyvinylidene chloride resin. Then, the obtained polyvinylidene chloride resin was melt-extruded using an extruder screw having a diameter of 90 mm, and the obtained film was biaxially stretched at the stretching temperature and stretch ratio shown in Table 1. Further, Table 1 After relaxing at the relaxation temperature and relaxation rate shown in 1. above, a base material film was obtained. The thickness of the obtained base material film, the acetone extraction rate, the piercing energy at 120 ° C., the heat shrinkage rate (longitudinal direction and short direction) at 100 ° C., and the tensile secant modulus (longitudinal direction and short direction) were measured. . The results are shown in Table 1.

  Further, copolymer A (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), A total of 8 parts by mass of dibutyl sebacate (DBS) and epoxidized vegetable oil was blended, and a total of 0.1 parts by mass of a surfactant, a lubricant and a satinizing agent was added to obtain a polyvinylidene chloride resin. Then, the obtained polyvinylidene chloride resin was melt-extruded using an extruder screw having a diameter of 90 mm, and the obtained film was biaxially stretched at the stretching temperature and stretch ratio shown in Table 1. Further, Table 1 After relaxing at the relaxation temperature and relaxation rate shown in 1), a film for reinforcing tape was obtained. Using the obtained film for reinforcing tape, the thickness of the reinforcing tape, the heat shrinkage rate (longitudinal direction and short direction) at 100 ° C., and the tensile secant modulus (longitudinal direction and short direction) were measured. The results are shown in Table 1.

Next, using a base material film cut to a width of 82 mm and a reinforcing tape cut to a width of 16 mm, a filling (fish meat slime 50 mass%, ice water 28.6 mass%, vegetable oil 10 mass%, corn starch 8 mass%, soybean A paste comprising 2% by mass of protein and 1.4% by mass of salt) was filled with an automatic filling and packaging machine (trade name KAP3000 type automatic filling and packaging machine manufactured by Kureha Co., Ltd.) to obtain a cylindrical package. That is, while forming the base material film into a cylindrical shape, filling the filler, concentrating the ends of the base material film by ultrasonic sealing, melting and sealing with a reinforcing tape, and sealing the cylindrical packaging body Obtained. In the case of a cylindrical base material film, the folding width (half the circumference) is 36 mm, the cut length (the filling material is extracted from the cylindrical package, and the remaining cylindrical base film is pressed flat. The length was measured in the longitudinal direction after spreading.) Was adjusted to 225 mm and mass 75 g. The operating conditions of the automatic filling and packaging machine were as shown below.
Filling speed: 150 / min.
Horn anvil clearance: 0.1 mm.
Seal pressure: 450 kPa.
Amplitude volume scale: 69 (equivalent to 16 μm).
Seal design: flat 6.5mm seal width.
Thickness (before retort) of the fused portion of the base material film and the reinforcing tape: 80 to 160 μm.
Vertical seal condition: Processed product with knurled eyes.
Convergence degree: 2 mm in diameter.
Film cutter: commercially available blade from Olfa.

(Example 2)
Copolymer A (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) and sebacic acid. A total of 8 parts by mass of dibutyl (DBS) and epoxidized vegetable oil was blended, and a total of 0.4 parts by mass of a surfactant, a lubricant and a satinizing agent was added to obtain a polyvinylidene chloride resin. Then, the obtained polyvinylidene chloride resin was melt-extruded using an extruder screw having a diameter of 90 mm, and the obtained film was biaxially stretched at the stretching temperature and stretch ratio shown in Table 1. Further, Table 1 After relaxing at the relaxation temperature and relaxation rate shown in 1. above, a base material film was obtained. The thickness of the obtained base material film, the acetone extraction rate, the piercing energy at 120 ° C., the heat shrinkage rate (longitudinal direction and short direction) at 100 ° C., and the tensile secant modulus (longitudinal direction and short direction) were measured. . The results are shown in Table 1.

  Next, a cylindrical package was obtained in the same manner as in Example 1 except that this base material film was used instead of the base material film obtained in Example 1.

(Example 3)
Copolymer A having a monomer charge mass ratio (VD / VC) of 81/19 during polymerization of vinylidene chloride (VD) and vinyl chloride (VC), and during polymerization of vinylidene chloride (VD) and vinyl chloride (VC) A mixture (100 parts by mass, A / B (mass ratio) = 75/25) of copolymer B having a monomer charge mass ratio (VD / VC) of 71/29, acetyltributyl citrate (ATBC), and sebacic acid A total of 6 parts by mass of dibutyl (DBS) and epoxidized vegetable oil was added, and a total of 0.25 parts by mass of a surfactant, a lubricant and a satinizing agent was added to obtain a polyvinylidene chloride resin. Then, the obtained polyvinylidene chloride resin was melt-extruded using an extruder screw having a diameter of 90 mm, and the obtained film was biaxially stretched at the stretching temperature and stretch ratio shown in Table 1. Further, Table 1 After relaxing at the relaxation temperature and relaxation rate shown in 1. above, a base material film was obtained. The thickness of the obtained base material film, the acetone extraction rate, the piercing energy at 120 ° C., the heat shrinkage rate (longitudinal direction and short direction) at 100 ° C., and the tensile secant modulus (longitudinal direction and short direction) were measured. . The results are shown in Table 1.

  Next, a cylindrical package was obtained in the same manner as in Example 1 except that this base material film was used instead of the base material film obtained in Example 1.

(Comparative Example 1)
Copolymer C having a monomer charge mass ratio (VD / VC) of 80/20 during polymerization of vinylidene chloride (VD) and vinyl chloride (VC), and during polymerization of vinylidene chloride (VD) and vinyl chloride (VC) A mixture (100 parts by mass, C / B (mass ratio) = 75/25) of copolymer B having a monomer charge mass ratio (VD / VC) of 71/29, acetyltributyl citrate (ATBC), and sebacic acid A total of 8 parts by mass of dibutyl (DBS) and epoxidized vegetable oil was blended, and a total of 0.2 parts by mass of a surfactant, a lubricant and a satinizing agent was added to obtain a polyvinylidene chloride resin. Then, the obtained polyvinylidene chloride resin was melt-extruded using an extruder screw having a diameter of 90 mm, and the obtained film was biaxially stretched at the stretching temperature and stretch ratio shown in Table 1. Further, Table 1 After relaxing at the relaxation temperature and relaxation rate shown in 1. above, a base material film was obtained. The thickness of the obtained base material film, the acetone extraction rate, the piercing energy at 120 ° C., the heat shrinkage rate (longitudinal direction and short direction) at 100 ° C., and the tensile secant modulus (longitudinal direction and short direction) were measured. . The results are shown in Table 1.

  Next, a cylindrical package was obtained in the same manner as in Example 1 except that this base material film was used instead of the base material film obtained in Example 1.

(Comparative Example 2)
Copolymer A having a monomer charge mass ratio (VD / VC) of 81/19 during polymerization of vinylidene chloride (VD) and vinyl chloride (VC), and during polymerization of vinylidene chloride (VD) and vinyl chloride (VC) A mixture (100 parts by mass, A / B (mass ratio) = 85/15) of copolymer B having a monomer charge mass ratio (VD / VC) of 71/29, acetyltributyl citrate (ATBC), and sebacic acid A total of 6.5 parts by mass of dibutyl (DBS) and epoxidized vegetable oil was blended, and a total of 0.4 parts by mass of a surfactant, a lubricant and a satinizing agent was added to obtain a polyvinylidene chloride resin. Then, the obtained polyvinylidene chloride resin was melt-extruded using an extruder screw having a diameter of 90 mm, and the obtained film was biaxially stretched at the stretching temperature and stretch ratio shown in Table 1. Further, Table 1 After relaxing at the relaxation temperature and relaxation rate shown in 1. above, a base material film was obtained. The thickness of the obtained base material film, the acetone extraction rate, the piercing energy at 120 ° C., the heat shrinkage rate (longitudinal direction and short direction) at 100 ° C., and the tensile secant modulus (longitudinal direction and short direction) were measured. . The results are shown in Table 1.

  Next, a cylindrical package was obtained in the same manner as in Example 1 except that this base material film was used instead of the base material film obtained in Example 1.

(Comparative Example 3)
Copolymer D (100 parts by mass) having a monomer charge mass ratio (VD / VC) of 82/18 during polymerization of vinylidene chloride (VD) and vinyl chloride (VC) was added to acetyltributyl citrate (ATBC) and sebacic acid. A total of 6 parts by mass of dibutyl (DBS) and epoxidized vegetable oil was blended, and a total of 0.4 parts by mass of a surfactant, a lubricant and a satinizing agent was added to obtain a polyvinylidene chloride resin. Then, the obtained polyvinylidene chloride resin was melt-extruded using an extruder screw having a diameter of 90 mm, and the obtained film was biaxially stretched at the stretching temperature and stretch ratio shown in Table 1. Further, Table 1 After relaxing at the relaxation temperature and relaxation rate shown in 1. above, a base material film was obtained. The thickness of the obtained base material film, the acetone extraction rate, the piercing energy at 120 ° C., the heat shrinkage rate (longitudinal direction and short direction) at 100 ° C., and the tensile secant modulus (longitudinal direction and short direction) were measured. . The results are shown in Table 1.

  Next, a cylindrical package was obtained in the same manner as in Example 1 except that this base material film was used instead of the base material film obtained in Example 1.

<Evaluation of sealing performance of cylindrical package>
The sealing properties of the cylindrical packages obtained in the examples and comparative examples were evaluated as follows. That is, a retort treatment for 15 minutes at a temperature of 120 ° C. and a set pressure of 2.5 kg / cm ² using a hot water storage-type retort sterilizer (manufactured by Nisaka Manufacturing Co., Ltd., product name Flavor Ace) on a cylindrical package. Was used as a sample. On the next day after the retort treatment, 100 samples were randomly extracted and immersed in a 0.4 mass% blue No. 1 dye solution and left at a temperature of 5 to 10 ° C. for 5 days. Thereafter, the sample was taken out from the dye solution, the outer surface was washed with water, the film was opened, and the sealing property was evaluated by examining the presence or absence of coloring in the filling material. Note that the clip portion (the portion where the reinforcing tape was welded) in which the dye solution had permeated and the filling of the contents was recognized was determined to be a poorly sealed clip portion, and poorly sealed in the 200 clip portions of 100 samples. The ratio (percentage) of the clip portion was determined and used as the sealing failure rate of the clip portion. The results are shown in Table 1.

  As is clear from the results shown in Table 1, the tubular package (Examples 1 to 3) of the present invention was excellent in the sealing performance of the clip portion of the tubular package.

As described above, according to the present invention, it is possible to obtain a cylindrical package with excellent clip portion sealing performance.
Therefore, the cylindrical package of the present invention is useful as a cylindrical package having a processed food such as cheese, sausage, kamaboko and ham as a filler.

Claims (7)

(A) a filler, and (B) a cylindrical base material film made of a polyvinylidene chloride-based resin film filled with the filler by focusing and sealing at both ends in the longitudinal direction; and (C And a reinforcing tape made of a polyvinylidene chloride-based resin film welded to the base material film so as to wind and cover the portion where the base material film is converged and sealed,
The heat shrinkage ratio RB _-TD at 100 ° C. in the short direction of the base material film before the focusing seal is in the range of 10.0 to 18.9%, the acetone extraction rate is 9.0% or less, and 120 A cylindrical package characterized by having a piercing energy at 2.1 ° C. of 2.1 mJ or more. The thermal shrinkage rate R _B-TD at 100 ° C. in the short direction of the base material film before the focusing seal and the thermal shrinkage rate R _C-MD at 100 ° C. in the longitudinal direction of the reinforcing tape before welding are expressed by the following formula (F1) ):
−8% ≦ R _B-TD −R _C-MD ≦ 9% (F1)
The cylindrical package body according to claim 1, wherein the condition expressed by The thermal shrinkage rate R _B-TD at 100 ° C. in the short direction of the base material film before the focusing seal and the thermal shrinkage rate R _C-MD at 100 ° C. in the longitudinal direction of the reinforcing tape before welding are expressed by the following formula (F1a ):
4.5% ≦ RB _{-TD- RC-MD} ≦ 6.5% (F1a)
The cylindrical package body according to claim 2, wherein the condition expressed by   The cylindrical packaging body according to any one of claims 1 to 3, wherein the piercing energy at 120 ° C of the base material film before the focusing seal is 2.5 mJ or more. The cylindrical shape according to any one of claims 1 to 4, wherein a tensile secant modulus EB _{-MD in} a longitudinal direction of the base material film before the focusing seal is in a range of 332 to 450 MPa. Packaging body.   The said base material film consists of a film of the polyvinylidene chloride resin containing the copolymer of a vinylidene chloride monomer and a vinyl chloride monomer, The any one of Claims 1-5 characterized by the above-mentioned. The cylindrical package body as described in 2.   The said reinforcing tape consists of a film of the polyvinylidene chloride type-resin containing the copolymer of a vinylidene chloride monomer and a vinyl chloride monomer, It is any one of Claims 1-6 characterized by the above-mentioned. The cylindrical package of description.