JP2016159916A - Sealing tape for packaging container and packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing tape for a packaging container which secures sufficient oxygen barrier property for the packaging container, and to provide the packaging container.SOLUTION: A sealing tape for a packaging container seals an overlapping portion of end parts of a belt-like packaging laminate material forming the packaging container. The sealing tape has: a base material film in which an oxygen barrier layer is formed on at least one surface; and a film formed on both surfaces of the base material film.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a packaging and filling apparatus for filling a packaging material with fluid food or the like.

  When manufacturing packaging containers that contain liquid foods such as fermented milk drinks, milk, mineral water, tea, juice, soup, alcohol, etc., web-like (band-like) packaging laminate materials are used, and the packaging laminate materials heat A packaging container is formed by sealing with a seal, an ultrasonic seal, or the like.

  In a packaging and filling device, a packaging laminate material is formed into a tube shape, sealed in the longitudinal direction (longitudinal direction) by a longitudinal seal device, and then filled with liquid food in the tubular packaging laminate material, It is sealed and cut in the lateral direction to form a pillow-shaped preformed container, and the preformed container is further formed into a final shape to complete a packaging container.

  When the packaging laminate material is formed into a tube shape and sealed in the longitudinal direction (longitudinal direction) by a longitudinal sealing device, the two sides of the strip-like packaging laminate material supplied in a roll state are overlapped and heat sealed. The packaging laminate material is continuously formed into a cylindrical shape. In that case, in order to protect the cross section of the packaging laminated material exposed along the longitudinal direction of the packaging container inside the packaging container, the elongated film is continuously heat-sealed along the heat seal portion.

  As a result, the end face of the vertical seal portion is protected with a sealing tape inside the tube-shaped packaging laminate material so that the contents do not leak from the overlapped vertical seal portion or penetrate into the outside (Patent Document). 1).

JP 2008-143075 A

  The objective of this invention is providing the sealing tape for packaging containers which can ensure sufficient oxygen barrier property as a packaging container, and a packaging container.

  A sealing tape for a packaging container according to an aspect of the present invention is a sealing tape for a packaging container that seals an overlapping portion of both edges of a strip-shaped packaging laminate material forming the packaging container, and has an oxygen barrier on at least one surface. It has the base film in which the layer was formed, and the film formed on both surfaces of the said base film.

  In the packaging container sealing tape described above, the oxygen barrier layer may be a resin film obtained by coating the base film with a resin.

  In the packaging container sealing tape described above, the oxygen barrier layer may be an inorganic film obtained by depositing an inorganic substance on the base film.

  In the above-described sealing tape for packaging containers, the base film may be a biaxially stretched film.

  A packaging container according to an aspect of the present invention is characterized in that the packaging container is formed of a packaging laminate material in which the overlapping portions of both edges of the belt-like packaging laminate material are sealed by the packaging container sealing tape described above.

  As described above, according to the present invention, since it has a base film having an oxygen barrier layer formed on at least one side and a film formed on both sides of the base film, it has sufficient oxygen barrier properties as a packaging container. Can be secured.

It is a perspective view which shows the outline | summary of a packaging filling apparatus. It is a perspective view which shows the sealing tape sticking apparatus of a packaging filling apparatus. It is a figure which shows the state which covered the overlapping part of the both edges of a strip | belt-shaped packaging laminated material with the sealing tape. It is a figure which shows the sealing tape for packaging containers by 1st Embodiment of this invention. It is a figure which shows the sealing tape for packaging containers by the modification of 1st Embodiment of this invention. It is a graph which shows the characteristic of the sealing tape for packaging containers by 1st Embodiment of this invention. It is a figure which shows the sealing tape for packaging containers by 2nd Embodiment of this invention.

[Packing and filling equipment]
A packaging and filling apparatus using a sealing tape for packaging containers according to the present invention will be described with reference to FIGS.

(Outline of packaging filling equipment)
First, the outline | summary of a packaging filling apparatus is demonstrated using FIG.

  The strip-shaped packaging laminate material 1 is supplied to the packaging filling apparatus in a reel state. The packaging laminate material 1 is composed of a paper substrate and a flexible laminate in which polyethylene resin is laminated on both sides of the paper substrate, and an aluminum foil or gas barrier property between the paper substrate and the film as necessary. A barrier layer made of a resin or the like is formed, and characters and patterns are printed in advance on a portion corresponding to the surface of the packaging container 14.

  The fed packaging laminate material 1 is continuously conveyed by a feeding device as a conveying means, is sent to a strip adhering device 3 through a bending roller, a damper roller, and the like, and is fed to one edge of the packaging laminate material 1 by the strip adhering device. A strip 2 is attached along the part.

  Subsequently, the pulling tab is attached to the packaging laminate material 1 by a pull tab attaching device as necessary. The packaging laminated material 1 is sent to the sterilization tank 4 and sterilized with a sterilization liquid such as hydrogen peroxide in the sterilization tank 4.

  Subsequently, the packaging laminate material 1 is sent to the upper chamber 30, dried by the air knife 33 in the upper chamber 30, and then sent into the aseptic room 16.

  Subsequently, the packaging laminate material 1 is gradually deformed by the forming ring 37 or the like to be formed into a tube shape.

  Subsequently, the packaging laminate material 1 is preheated by hot air from the preheating means of the longitudinal seal device 8, sealed in the longitudinal direction, and the fluid food supplied via the filling pipe 7 is converted into the tubular packaging laminate material 1. Filled in.

  Subsequently, the tube-shaped packaging laminate material 1 filled with the fluid food is guided by a roller, sent to the horizontal sealing device 10, and sandwiched and sealed in the horizontal direction. The horizontally sealed packaging laminate material is cut with a cutting blade or the like to form a pillow-shaped preformed container 13. And the preforming container 13 is conveyed by the final shaping | molding conveyance apparatus 15, is shape | molded in the final shape, and the packaging container 14 which accommodates a fluid food is completed.

(Sealing tape sticking device)
Next, the sealing tape sticking apparatus of a packaging filling apparatus is demonstrated using FIG.

 The packaging laminate material 1 is continuously conveyed by a bending roller and a damper roller, and sent to the sealing tape sticking device 3. The edge 1a of the packaging laminate material 1 is preheated by the heating device 31, and the sealing tape 2 is attached along the edge by the sealing tape attaching device.

  The sealing tape 2 is supplied from a sealing tape roll 32. A pressure roller 20 is rotatably disposed on one side of the band-shaped packaging laminate material 1 and the sealing tape 2. On the other side, a counter roller (not shown) is rotatably disposed so as to receive pressure from the pressure roller 20, face the pressure roller 20, and hold and support the pressure roller 20. As the packaging laminate material 1 is conveyed, the pressure roller 20 and the counter roller (not shown) are pressed and rotated, and the sealing tape 2 is adhered to the edge 1 a of the packaging laminate material 1.

  Thereafter, the packaging laminate material 1 is gradually deformed by the forming ring 37 or the like to form a tube shape, and is sealed in the vertical direction by the vertical sealing device 8. As shown in FIG. 3, the edge 1 a and the edge 1 b of the belt-shaped packaging laminate material 1 are overlapped, and the overlapped portion is covered with the sealing tape 2. The upper part of FIG. 3 is the inside of the packaging container 14, and the overlapping portion of the edge 1 a and the edge 1 b of the strip-shaped packaging laminate material 1 is sealed by the sealing tape 2.

  For example, as shown in FIG. 3, an aluminum layer 1c is provided inside the packaging laminate material 1 to ensure oxygen barrier properties, but the overlapping portion of the edge 1a and the edge 1b is sealed with a sealing tape. The oxygen barrier property is ensured by covering with 2.

[Sealing tape for packaging containers]
In the manufacture of aseptic filling paper packs for beverages, the packaging material is continuously formed into a cylindrical shape by overlapping and heat-sealing both edges of the packaging laminate material supplied in a roll state to fill the contents.

  At that time, in order to protect the cross section of the packaging laminate material exposed along the longitudinal direction of the packaging container inside the packaging container, a long and narrow sealing tape is continuously heat-sealed along the heat seal part where both edges are overlapped. Is done. Select a sealing tape that can be heat-sealed with packaging laminate material.

  Usually, since the innermost surface of the packaging container is coated with polyethylene, a single layer of polyethylene or a multilayer film or a multilayer film made of polyethylene and another synthetic resin material is used for the sealing tape.

  Since a film having a high mechanical strength is preferable when forming a packaging container in a packaging and filling apparatus, a film in which polyethylene is laminated on both sides using a PET resin as a base material is used.

  A barrier layer is laminated on the packaging laminate material used in the aseptic filling paper pack, and an aluminum foil is laminated for light shielding and oxygen barrier. However, since the aluminum foil is discontinuous at the heat seal portion at the edge of the packaging laminate material, there is a possibility that oxygen may enter from the overlapping portion of both edges of the packaging laminate material. When a high barrier property is required as a packaging container, the high barrier property is secured by covering with a sealing tape for the packaging container.

  As such a packaging container sealing tape, for example, a film obtained by laminating an EVOH resin having a better oxygen barrier property than a PET resin as a base material may be used.

The EVOH resin is a copolymer of ethylene and vinyl alcohol, and a resin having an ethylene content of 27 to 47 mol% is used. The index OTR (Oxygen Transmission Rate) value indicating the oxygen barrier performance of EVOH resin has a characteristic of about 1 cc / m ² · day · atm or less in terms of a film having a thickness of 20 microns at a room temperature of 20 to 23 ° C. Have.

  However, EVOH resin is a highly hygroscopic resin, and the oxygen barrier property has temperature dependency and humidity dependency. As the temperature increases, the oxygen transmission rate increases. Even if the temperature is not high, the oxygen permeability increases as the humidity increases.

  Since the sealing tape for packaging containers is stuck to the inner surface of the packaging container, it comes into contact with the fluid food that is the content, and the moisture content is in a saturated state that is in equilibrium with the fluid food. For this reason, when EVOH resin is used, there exists a possibility that the oxygen permeability of the sealing tape for packaging containers may become large.

  As a result of diligent research efforts under such a technical background, the inventor of the present application has invented a sealing tape for a packaging container having sufficient oxygen barrier properties even when used for a packaging container for storing fluid food. It came.

(First embodiment)
The packaging container sealing tape according to the first embodiment of the present invention will be described with reference to FIG.

  FIG. 4A shows a base film 40 of the packaging container sealing tape according to the present embodiment.

  In the base film 40, an oxygen barrier layer 44 made of an organic compound resin having an oxygen barrier property is coated on both surfaces of the biaxially stretched film 42.

  The biaxially stretched film 42 is a film made of a resin such as polyester, polyamide, polyethylene naphthalate, or polypropylene. The film thickness of the biaxially stretched film 42 is, for example, 6-100 μm. Instead of the biaxially stretched film 42, a uniaxially stretched film, an unstretched film, or the like may be used.

  The oxygen barrier layer 44 is a thin film made of, for example, a resin such as an acrylic acid resin, a vinyl alcohol resin, a polyester resin, or a polyurethane resin, or a composition obtained by adding an inorganic layered compound to these resins. The film thickness of the oxygen barrier layer 44 is, for example, 0.1 to 5.0 μm.

  Next, as shown in FIG. 4B, an adhesive 46 is applied to both surfaces of the base film 40 shown in FIG.

  The adhesive 46 is, for example, urethane, epoxy, EVA resin, or the like. The film thickness of the adhesive 46 is, for example, 0.05 to 5 μm.

  Next, as shown in FIG. 4C, a polyethylene film 48 is laminated on both sides of the base film 40 coated with the adhesive 46 shown in FIG. 4B by dry lamination, extrusion lamination, or the like. The polyethylene film 48 is a low density polyethylene, a linear low density polyethylene, or a laminated film thereof.

  As a result, the packaging container sealing tape 50 in which the oxygen barrier layer 44 and the polyethylene film 48 are formed on both surfaces of the biaxially stretched film 42 is completed.

(Modification of the first embodiment)
A packaging container sealing tape according to a modification of the first embodiment of the present invention will be described with reference to FIG. In the first embodiment, the oxygen barrier layer is coated on both sides of the biaxially stretched film, but in this modification, the oxygen barrier layer is coated on one side of the biaxially stretched film.

  FIG. 5A shows a base film 40 of a packaging container sealing tape according to this modification.

  The base film 40 is coated with an oxygen barrier layer 44 having an oxygen barrier property only on one side of the biaxially stretched film 42. The biaxially stretched film 42 and the oxygen barrier layer 44 are the same as in the first embodiment.

  Next, as shown in FIG. 5B, an adhesive 46 is applied to both surfaces of the base film 40 shown in FIG. The adhesive 46 is the same as in the first embodiment.

  Next, as shown in FIG. 5C, a polyethylene film 48 is laminated by dry lamination, extrusion lamination, or the like on both surfaces of the base film 40 to which the adhesive 46 shown in FIG. 5B is applied. The polyethylene film 48 is the same as in the first embodiment.

  As a result, the packaging container sealing tape 50 having the polyethylene film 48 formed on both surfaces of the base film 40 having the oxygen barrier layer 44 formed on one surface of the biaxially stretched film 42 is completed.

(Oxygen barrier layer)
The oxygen barrier layer 44 may be made of the following materials.

  (1) By copolymerization of a polyvinyl alcohol polymer (A) having a polymerization degree of 200 to 2000 and a saponification degree of 90 to 99.99 mol%, and acrylic acid and an acetal group-containing ethylenically unsaturated monomer. A composition containing a polyacrylic acid copolymer (B) containing 0.1 to 99 mol% of a unit derived from the acetal group-containing ethylenically unsaturated monomer, which is obtained as component (A) A gas barrier resin composition in which the weight ratio (A) :( B) of component (B) is 99: 1 to 80:20.

  (2) A composition comprising an alkyl-modified vinyl alcohol polymer and an inorganic layered compound, wherein the alkyl-modified vinyl alcohol polymer contains a monomer unit (a) represented by the following formula (I) And a viscosity average polymerization degree of 200 to 4,000, a saponification degree of 90 to 99.99 mol%, and a content of the monomer unit (a) of 0.05 to 5 mol%. A composition.

  (3) Viscosity average polymerization degree is 100 to 1000, ratio Pw / Pn of weight average polymerization degree (Pw) and number average polymerization degree (Pn) is 2.4 or more, and α- having 4 or less carbon atoms. A gas barrier coating agent comprising a polyvinyl alcohol polymer containing 2 to 12 mol% of an olefin unit, wherein the polyvinyl alcohol polymer is applied to a base film as an aqueous solution.

  (4) A film coating agent comprising an aqueous solution of a water-soluble polyvinyl alcohol polymer having 3 to 19 mol% of α-olefin units having 4 or less carbon atoms and a polymerization degree of 600 or less.

  (5) A step of applying a coating liquid (A) containing a polycarboxylic acid polymer and a polyalcohol polymer and drying to form a laminated film by laminating a coating layer (step a) And a step of forming the stretched laminated film by stretching and heat-setting the laminated film (step b), and a coating layer (B) containing the polyvalent metal compound and the coating layer of the stretched laminated film And a material formed in the step of forming a gas barrier layer (step c).

  (6) An aqueous coating solution containing at least a poly (meth) acrylic acid polymer, a polyalcohol polymer, a polyhydric alcohol plasticizer, and an aqueous medium is applied to the coating film. A material that forms a coated film with a coating layer.

  (7) The first solvent, 0.1 to 30 parts by mass of the polycarboxylic acid polymer with respect to 100 parts by mass of the solvent, and 0 with respect to the amount of the carboxyl group in the polycarboxylic acid polymer. A coating liquid containing 0.05 to 0.25 chemical equivalent of a zinc compound, and the polycarboxylic acid polymer has a number average molecular weight in the range of 40,000 to 10,000,000.

  (8) A coating liquid containing a carboxyl group-containing polymer (A), polyvalent metal compound particles (B), a surfactant (C), and an organic solvent (D), and having a water content of 1,000 ppm or less. A gas barrier film that is a dry coating film.

  (9) The α, β-unsaturated carboxylic acid monomer and the crosslinkable organic compound having at least one functional group that reacts with the carboxyl group are converted into the moles of the carboxyl group of the α, β-unsaturated carboxylic acid monomer. A polymerizable monomer composition containing a ratio B / A of the number of moles B of the functional group of the crosslinkable organic compound to the number A in a range of 0.15 to 2.20.

  (10) On the substrate, an amount corresponding to an α, β-unsaturated carboxylic acid monomer and a chemical equivalent of 0.20 to 0.90 with respect to the carboxyl group of the α, β-unsaturated carboxylic acid monomer. Of polyvalent metal ions, an inorganic layered compound in a weight ratio of 0.001 to 0.45 to the α, β-unsaturated carboxylic acid monomer, and 20 to 85% by weight of water based on the total amount of the composition An ion-crosslinked polycarboxylic acid formed by applying a water-based polymerizable monomer composition containing a wet coating film to form a wet coating film, and subjecting the wet coating film to irradiation treatment with ionizing radiation and / or heating. Acid polymer film.

  (11) A gas barrier polycarboxylic acid-based resin layer is formed on at least one surface of the plastic film substrate, and the polycarboxylic acid-based resin is carboxylated by a metal ion in a divalent or higher metal compound without being subjected to heat treatment. A gas barrier laminate film that is cross-linked and has both flexibility and gas barrier properties.

(Base film)
As a base film of this embodiment, for example, “Clarista C film (trade name)” manufactured by Kuraray Co., Ltd., “Besera (trade name)” manufactured by Toppan Printing Co., Ltd., “Emblem NV ( Product name) ".

Example 1
As a base film, a Kuraray Co., Ltd. Clarista C film was used. A two-component urethane anchor was applied to the film surface and dried, and then a polyethylene layer of about 30 μm was laminated by extrusion laminating. Then, the same lamination process was performed also on the other surface of the film, and the laminated film of the structure of polyethylene / oxygen barrier layer / polyethylene was created. Thereafter, the laminated film was slit to obtain a tape having a width of 7.5 mm.

  Kuraray Co., Ltd. Clarista C film is a base film in which an oxygen barrier layer is formed on one side of a biaxially stretched film.

  The paper pack filling test was conducted as follows to evaluate the performance of the tape.

  Water filling with a TBA / 19 filling machine, a Tetra Pak aseptic filling machine, using juice-specific packaging material and the produced barrier tape for covering a cross section of a paper pack. Manufactured. The filling water was deaerated so that the dissolved oxygen at the time of filling was 1 ppm or less.

(Comparative Example 1)
A water-filled pack was produced in the same manner as in Example 1 except that a biaxially stretched EVOH film having a thickness of 12 μm was used as the base film.

  A paper pack filling test was conducted in the same manner as in Example 1 to evaluate the performance of the tape.

(Comparative Example 2)
A water-filled pack was produced in the same manner as in Example 1 except that a biaxially stretched PET film having a thickness of 12 μm was used as the base film.
A paper pack filling test was conducted in the same manner as in Example 1 to evaluate the performance of the tape.

(Preservation test)
For the paper packs of Example 1, Comparative Example 1 and Comparative Example 2, a storage test was conducted at 23 ° C. and 37 ° C. for 3 months, and a storage test was performed to measure the change in dissolved oxygen in the filling water in the paper pack during that period. went.

  FIG. 6A is a graph showing changes in the dissolved oxygen content of the filling water in the paper pack in the storage test at 23 ° C. FIG. 6B is a graph showing changes in the dissolved oxygen content of the filling water in the paper pack in the storage test at 37 ° C. 6A and 6B, the vertical axis represents the dissolved oxygen amount (DO) / ppm, and the horizontal axis represents the storage period (Storge / month).

  In Comparative Example 2 (Seal tape based on PET), the increase in dissolved oxygen in the paper pack filling water is large under either storage condition, and the oxygen barrier property is poor.

  When Example 1 (seal tape with a Clarista C film as a base material) and Comparative Example 1 (seal tape with a EVOH film as a base material) are compared, the storage time of Example 1 is longer than that of Comparative Example 1. It turns out that it is excellent in oxygen barrier property, so that becomes long.

  Moreover, it turns out that the direction of Example 1 is excellent in oxygen barrier property, so that storage temperature becomes high compared with the comparative example 1. That is, it can be seen that Example 1 has no temperature dependency on the oxygen barrier property as compared with Comparative Example 1. It can be seen that Example 1 is more advantageous as the storage temperature increases.

(Second Embodiment)
A packaging container sealing tape according to a second embodiment of the present invention will be described with reference to FIG. In this embodiment, an oxygen barrier layer of an inorganic substance or an inorganic compound having an oxygen barrier property is coated on one surface of a biaxially stretched film.

  FIG. 7A shows a base film 40 of a packaging container sealing tape according to the present embodiment.

  In the base film 40, an oxygen barrier layer 52 having an oxygen barrier property is coated only on one surface of the biaxially stretched film 42 by vacuum deposition or the like. The biaxially stretched film 42 is the same as in the first embodiment.

  The oxygen barrier layer 52 is, for example, an inorganic or inorganic oxide film such as aluminum, silica, alumina, or amorphous carbon. The film thickness of the oxygen barrier layer 52 is, for example, 0.01 to 0.1 μm.

  Examples of the base film of the present embodiment include “GL film” manufactured by Toppan Printing Co., Ltd. and “IB-PET” manufactured by Dai Nippon Printing Co., Ltd.

  Next, as shown in FIG. 7B, an adhesive 46 is applied to both surfaces of the base film 40 shown in FIG.

  The adhesive 46 is, for example, urethane, epoxy, EVA or the like. The film thickness of the adhesive 46 is, for example, 0.05 to 5 μm.

  Next, as shown in FIG.7 (c), the polyethylene film 48 is apply | coated on both surfaces of the base film 40 with which the adhesive agent 46 shown in FIG.4 (b) was apply | coated. The polyethylene film 48 is a low density polyethylene, a linear low density polyethylene, or a laminated film thereof.

  As a result, the packaging container sealing tape 50 having the polyethylene film 48 formed on both surfaces of the base film 40 having the oxygen barrier layer 52 formed on one surface of the biaxially stretched film 42 is completed.

[Modified Embodiment]
The present invention is not limited to the above embodiment, and various modifications can be made.

  For example, in the above embodiment, the sealing tape according to the present invention is used for the vertical seal when manufacturing the packaging container. However, the sealing tape according to the present invention may be used for sealing at other locations.

1 ... Packaging material 2 ... Strip (sealing tape)
3. Strip adhering device (sealing tape adhering device)
DESCRIPTION OF SYMBOLS 7 ... Filling pipe 8 ... Vertical sealing apparatus 10 ... Horizontal sealing apparatus 13 ... Preliminary container 14 ... Packaging container 15 ... Final shaping | molding conveyance apparatus 16 ... Aseptic chamber 20 ... Pressure roller 30 ... Upper chamber 31 ... Heating apparatus 32 ... Sealing tape roll 33 ... Air knife 37 ... Forming ring 40 ... Base film 42 ... Biaxially stretched film 44, 52 ... Oxygen barrier layer 46 ... Adhesive 48 ... Polyethylene film 50 ... Sealing tape for packaging containers

Claims (5)

A sealing tape for a packaging container that seals an overlapped portion of both edges of a strip-shaped packaging laminate material forming a packaging container,
A base film having an oxygen barrier layer formed on at least one surface;
A sealing tape for a packaging container, comprising: a film formed on both sides of the base film. The sealing tape for packaging containers according to claim 1,
The oxygen barrier layer is a resin film obtained by coating the base film with a resin. The sealing tape for packaging containers according to claim 1,
The said oxygen barrier layer is an inorganic film which vapor-deposited the inorganic substance on the said base film. The sealing tape for packaging containers characterized by the above-mentioned. In the sealing tape for packaging containers according to any one of claims 1 to 3,
The said base film is a biaxially stretched film. The sealing tape for packaging containers characterized by the above-mentioned.   A packaging container formed of a packaging laminate material in which the overlapping portions of both edges of the strip-like packaging laminate material are sealed by the packaging container sealing tape according to any one of claims 1 to 4.

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