JP6926412B2 - Pouch with spout - Google Patents

Description

The present invention relates to a pouch with a spout. In particular, the present invention relates to a pouch with a spout, which has little adsorption of flavor components of the contents and does not cause the contents to leak.

Pouches with spouts used for liquid contents such as foods and non-foods are widely used as typical examples of juices and sports drinks, and have a plastic film as a base material and a sealant layer made of thermoplastic resin on the inner surface. It consists of the provided laminated material. Pouches with spouts are also widely used in liquid foods such as milk drinks and soups, semi-solid foods such as jelly, bean paste, and miso, liquid detergents, shampoos, and medical chemicals.

These pouches with spouts are composed of a base material and a sealant layer, or an aluminum foil, a metal vapor deposition film, or a metal oxide vapor deposition film is used between the base material and the sealant layer to form a gas barrier layer, or an inorganic compound. Some have a gas barrier layer such as a vapor-deposited film.

A sealant layer is provided on the inner layer of the pouch, and the film forming the front side and the back side of the pouch can be attached to the pouch by the sealant layer, and the container can be sealed after filling the contents. .. Generally, a polyolefin resin is used for the sealant layer.

A spout made of polyethylene resin, which serves as a take-out port for the contents, is attached to any of the top, shoulders, and body of the pouch by heat bonding.

In addition, depending on the application, a so-called bottom tape is inserted into the bottom of the pouch to allow the bottom surface to be formed so that it is self-supporting, and a so-called gusset bag structure with a gusset in the thickness direction. There are various shapes.

On the other hand, while polyethylene resin as a sealant layer is easy to use, it has been pointed out that the flavor component of the contents may be adsorbed and the flavor may change. Alternatively, it has been pointed out that the odor peculiar to polyethylene resin is transferred to the contents.

Therefore, for example, the following patent documents disclose a method of imparting heat sealability by irradiating the surface of a biaxially stretched polyethylene terephthalate film with a short pulse and modifying the surface, and a polyolefin resin is applied to the sealant layer. Although it has been shown that it is possible to use polyethylene terephthalate resin instead of, such a high-power device has low energy efficiency, has problems in terms of safety, and has problems in terms of cost, so it is practical. It has not been converted.

Further, since the spout is a molded product of polyethylene resin, it is difficult to attach it to the polyethylene terephthalate film by heat sealing.

Special Fair 4-263339

The present invention has been made in view of such a situation, and an object of the present invention is to provide a pouch with a spout, which has less adsorption of flavor components of contents and transfer of resin odor to contents. Another object of the present invention is to provide a pouch with a spout in which the spout and the pouch body are heat-welded without gaps, the contents are well held, and there is little risk of leakage.

In order to solve the above problems, the invention according to claim 1 of the present invention is a pouch with a spout in which laminated bodies are laminated, and the innermost layer of the pouch of the laminated body has a fine structure on the inner surface of the pouch. A sealant layer made of a polyethylene terephthalate film formed and having a heat-sealing property, which has a thermoplastic resin layer of an unstretched polyolefin film having a thickness in the range of 30 μm or more and 50 μm or less adjacent to the sealant layer. A pouch with a spout, characterized in that a spout made of polyester resin is heat-welded to the sealant layer.

The invention according to claim 2 is the pouch with a spout according to claim 1, wherein the sealant layer is a biaxially stretched polyethylene terephthalate film.

The invention according to claim 3, claim 1 or claim 2, wherein the sealant layer has a selectively heat sealability only heat-welded portion of the laminate It is a pouch with a spout described in.

According to the present invention, a pouch as a sealant layer is formed by forming a fine structure on the surface of a polyethylene terephthalate film in which the adsorption of flavor components of the contents and the transfer of resin odor to the contents are small and the heat sealability is exhibited. It is possible to arrange it in the innermost layer of the spout, and by making the spout made of polyester resin, it is possible to heat weld it with the sealant layer, and by arranging an unstretched polyolefin film adjacent to the sealant layer, the sealant layer of the spout It is possible to provide a pouch with a spout that can be heat-welded to the plastic without any gaps.

Further, by converting the polyethylene terephthalate film into a biaxially stretched polyethylene terephthalate film, the adsorption of flavor components of the contents and the transfer of the resin odor to the contents are further reduced, the strength such as tension is large, and the film expands and contracts in the processing process. It is possible to provide a pouch with a spout that can hold more stable contents because the amount is small.

Further, by setting the thickness of the unstretched polyolefin film to 20 μm or more and 50 μm or less, heat welding between the spout and the sealant layer can be performed more stably, and a pouch with a spout with less risk of leakage of the contents can be provided. can.

Further, by selectively having the heat-sealing property only in the heat-welding portion of the laminated body of the sealant layer, there is no possibility that unnecessary heat-welding occurs and the required heat-sealing property is efficiently exhibited. Attached pouches can be provided.

The side schematic view of the pouch with a spout of this invention. The external view which shows the other form of the pouch with a spout of this invention. The cross-sectional schematic diagram which shows the structural example of the laminated body of the pouch with a spout of this invention. FIG. 6 is a schematic cross-sectional view of a spout welded portion of a pouch with a spout of the present invention. The partial cross-sectional schematic diagram for demonstrating the spout part of the pouch with a spout of this invention.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these examples.

FIG. 1 is a schematic side view for explaining an embodiment of a pouch with a spout according to the present invention. The example shown here is a pouch with a spout in the form of a standing pouch with a bottom tape sandwiched between them. The pouch with spout (101) is composed of a top portion (3), a body portion (2), and a bottom portion (4), and has a spout (1) at the top portion (3). The spout (1) can be sealed with a cap (5). The spout (1) is used to pour out the contents after filling and sealing the pouch with spout (101).

The shape of the pouch with a spout of the present invention is not limited to that shown in FIG. A three-sided pouch with heat-sealed three sides, a gusset pouch with a gusset in the thickness direction, or the like may be used. The positions for attaching the spouts are as shown in FIG. 2 (a) diagonally attached to the shoulder of the pouch as shown in FIG. 2, and FIG. 2 (b) attached on the laminated body surface of the body. ) May be used.

FIG. 3 is a schematic partial cross-sectional view for explaining an embodiment of a laminated body constituting a pouch with a spout according to the present invention. The laminate (102) has a base material layer (6) based on a plastic film, and has a sealant layer (7) made of a polyethylene terephthalate film on the innermost layer side of the pouch. A thermoplastic resin layer (8) made of a polyolefin film is provided adjacent to the sealant layer (7), and a printing layer (14) is provided on the outermost layer. In the example shown here, the base material layer (6) is bonded to the gas barrier layer (9) via the adhesive layer (13), and the gas barrier layer (9) is the plastic film layer (10) and the inorganic compound layer (10). 11) and.

Hereinafter, more detailed description will be added to the elements constituting the pouch with spout according to the present invention.

(Sealant layer)
By using a polyethylene terephthalate film as a sealant instead of the conventional polyolefin-based resin as the sealant layer (7), the odor peculiar to the polyolefin resin can be transferred to the contents and the components of the contents can be adsorbed by the sealant. Since it can be reduced, the influence of adsorption of the flavor component of the content by the sealant layer (7) can be reduced.

Further, as the polyethylene terephthalate film, a biaxially stretched polyethylene terephthalate film can be more preferably used in terms of high film strength and small expansion and contraction in the processing process. A biaxially stretched polyethylene terephthalate film having a thickness of 6 μm to 50 μm can be used, and a thickness of 12 μm to 25 μm is more preferable. A metal, an inorganic compound, or the like may be vapor-deposited on the biaxially stretched polyethylene terephthalate film. In that case, the non-deposited surface is laminated so that it is on the inner side of the pouch.

The formation of the fine structure for exhibiting the heat-sealing property can be performed by drawing and irradiating the portion where the heat-sealing property is exhibited by using a continuous irradiation type laser beam instead of a short-pulse electromagnetic wave. As the laser light, for example, a carbon dioxide gas laser having an infrared wavelength in which energy is easily absorbed by the polyethylene terephthalate film can be used. As a result, the sealant layer (7) having high energy efficiency and high safety can be realized.

Further, the laser oscillator is not limited to a specific type as long as it is a laser beam having an infrared wavelength. Heat-sealing properties are exhibited in the portion irradiated with the laser beam due to the alteration of the polyethylene terephthalate film.

The polyethylene terephthalate film irradiated with the laser beam is altered by being temporarily melted by the energy of the laser beam. The region irradiated with the laser beam loses its flatness according to the irradiation trajectory, and a fine structure having concave portions or convex portions is formed. As a microstructure, for example, a plurality of continuous linear ridges are formed in parallel at predetermined intervals. The microstructure can take various forms depending on the output of the laser beam, the energy density in the irradiation spot, the shape of the scanning locus, the scanning speed, and the like.

In this way, the portion irradiated with the laser beam exhibits heat-sealing properties due to alteration. As the content of the alteration, for example, at least a partial decrease or disappearance of the molecular orientation of the polyethylene terephthalate film can be considered. It is also possible that other factors are involved. Then, in order to form the pouch, the heat-sealing property is completed by irradiating the portion where the laminate is heat-welded and the portion where the spout is heat-welded with laser light.

Explaining the portion to be irradiated with the laser in the example of FIG. 1, it is a shaded portion of the peripheral portion of each of the top portion (3), the body portion (2), and the bottom portion (4). The portion where the spout (1) is heat-welded is included in the peripheral edge of the top in the example of FIG. When the spout (20) is provided on the shoulder as shown in FIG. 2A, the spout (20) is similarly heat-welded to the heat-sealed portion (22) on the peripheral edge of the shoulder. When the spout (21) is mounted on the laminated body surface of the body portion (2) as shown in FIG. 2B, a ring-shaped laser irradiation is performed around the spout (21), and a heat seal for heat welding the spout (21) is performed. A portion (23) can be provided.

The laser beam can be irradiated in the form of drawing a continuous line, an intermittent line, or a dot-like pattern. Alternatively, planar irradiation can be performed. Such a shape can be formed by appropriately setting the spot diameter of the laser beam, the spot shape, and the like.

(Thermoplastic resin layer)
A thermoplastic resin layer (8) made of an unstretched polyolefin film is provided adjacent to the sealant layer (7). As the resin used for the thermoplastic resin layer (8), a low-density polyethylene resin (LDPE), a linear low-density polyethylene resin (LLDPE), or a polypropylene resin can be preferably used. A thickness of 20 μm or more provides a useful effect, but a thickness in the range of 30 μm to 50 μm is more preferred.

FIG. 4 is a diagram schematically showing a cross section of a part of a portion where the spout and the laminate of the pouch with a spout of the present invention are heat-welded. For the sake of simplification of the drawings, only the sealant layer and the thermoplastic resin layer are shown as the laminate. Due to the shape of the end portion (16) of the spout (1), a gap (17) is likely to occur when welding to the sealant layer (7) as shown in FIG. 4 (a). However, by arranging the thermoplastic resin layer (8) made of a polyolefin film adjacent to the sealant layer, the thermoplastic resin layer (8) flows when a thermal pressure is applied as shown by the arrow in FIG. 4 (a). The plasticity is enhanced, the gap (16) is filled according to the shape of the end portion (16), and heat welding without a gap becomes possible as shown in FIG. 4 (b).

(Base layer)
The base material layer (6) can be separately laminated on the laminated body. The base material layer (6) is not particularly limited as long as it is a plastic film having appropriate strength, flexibility, and durability, but is generally a biaxially stretched polyethylene terephthalate film or a biaxially stretched nylon film. , Stretched polyolefin film and the like are used. The thickness is preferably 5 μm to 25 μm, more preferably 10 μm to 20 μm. Further, paper may be laminated and adhered to these films.

(Gas barrier layer)
For the purpose of improving the storage stability of the contents, an opaque layer such as a colored film that shields ultraviolet rays can be provided in the laminate. Alternatively, the gas barrier layer (9) can be provided in the laminated body.

The gas barrier layer (9) can be used as the gas barrier layer (9) by providing a metal foil such as an aluminum foil or a vapor-deposited layer of a metal or an inorganic compound on a plastic film. Inorganic compounds include, for example, inorganic compounds such as SiO and AlO. The gas barrier layer (9) can be laminated by using an adhesive, for example, by a dry lamination method, or can be laminated by extruding a thermoplastic resin using an extruder. Further, after the anchor coat layer is provided on the plastic film, the vapor deposition layer and the inorganic compound layer by coating can be sequentially provided.

As the plastic film used for the gas barrier layer (9), a film such as polyethylene terephthalate, nylon, or polypropylene can be used. In particular, a biaxially stretched polyethylene terephthalate film is preferably used because it has little expansion and contraction during vapor deposition processing and laminating processing. A thickness of 6 to 25 μm is preferably used.

For example, urethane acrylate can be used for the anchor coat layer of the gas barrier layer (9). To form the anchor coat layer, a paint in which a resin is dissolved in a solvent is coated by a printing method such as gravure coating, or a coating film can be formed by using a generally known coating method.

As a method for forming the inorganic compound layer by coating, an aqueous solution or an aqueous solution containing at least one of (a) one or more alkoxides or hydrolysates thereof, or both, or (b) tin chloride is used. A coating agent containing a water / alcohol mixed aqueous solution as a main component can be applied onto a film and dried by heating to form an inorganic compound layer by a coating method. At this time, by adding a silane monomer to the coating agent, it is possible to improve the adhesion with the anchor coat layer.

The inorganic compound layer has a gas barrier property only by the vapor deposition layer by the vacuum vapor deposition method on the plastic film, but the inorganic compound layer by the coating method is formed by superimposing it on the vapor deposition layer which is the inorganic compound layer by the vacuum vapor deposition method, and the gas barrier layer ( 9).

By combining these two layers, a reaction layer of both layers is formed at the interface between the inorganic compound layer by the vacuum vapor deposition method and the inorganic compound layer by the coating method, or the inorganic compound layer by the coating method becomes an inorganic compound layer by the vacuum vapor deposition method. By filling and reinforcing defects such as pinholes, cracks, and grain boundaries or micropores that occur, a dense structure is formed, which realizes high gas barrier properties, moisture resistance, and water resistance, and is flexible enough to withstand deformation. Since it has a property, it can also be suitable as a packaging material.

Further, when SiO is used as the inorganic compound layer, unlike the case where the metal foil is used as the gas barrier layer, a metal detector or the like as a foreign matter inspection machine can also be used. These may be appropriately selected and used properly according to the application of the pouch with spout and the required quality.

The gas barrier layer (9) may be a plastic film (10) or an inorganic compound layer (11) on the base material layer (6) side of the laminated body (102).

(Adhesive layer)
The adhesive layer (13) shown in FIG. 3 is an adhesive layer for adhering the base material layer (6) and the gas barrier layer (9) when the gas barrier film is included in the laminate. For example, a polyolefin-based resin may be used for laminating by sandwich lamination. In this case, the thickness is usually in the range of 10 μm to 60 μm. If it is less than 10 μm, sufficient adhesive strength cannot be obtained.

Specifically, ethylene-based resins such as low-density polyethylene and linear low-density polyethylene, polypropylene, or ethylene / α, β such as ethylene / acrylic acid copolymer and ethylene / methacrylic acid copolymer (EMAA). Unsaturated carboxylic acid copolymer, esterified product of ethylene / α, β unsaturated carboxylic acid copolymer such as ethylene / methyl acrylate, ethylene / ethyl acrylate, ethylene / methyl methacrylate, ethylene / ethyl methacrylate, carboxylic Ion cross-linked products of ethylene / α, β unsaturated carboxylic acid copolymers in which the acid moiety is crosslinked with sodium ions or zinc ions, ethylene / maleic anhydride graft copolymers and ethyl ethylene / ethyl acrylate / maleic anhydride Acid anhydride-modified polyolefin represented by ternary copolymer such as, epoxy compound modified polyolefin such as ethylene / glycidyl methacrylate copolymer, single resin selected from ethylene / vinyl acetate copolymer, or from these It is provided by a mixture of two or more kinds selected.

In order to increase the adhesive strength, the adhesive surfaces of the base material layer (6) and the gas barrier layer (9) can be subjected to an easy adhesive treatment such as corona treatment, ozone treatment, and anchor coating.

(Print layer)
A printing layer (14) can be provided on the outer surface of the base material layer (6). In printing, in addition to information on the contents, logo marks and the like can be displayed, and images, application examples, barcodes, etc. on the contents can be displayed in characters and images.

The printing method is not limited, and for example, a gravure printing method, an offset printing method, a gravure offset printing method, a flexographic printing method, an inkjet printing method, or the like can be used.

The printing ink is not limited, and can be appropriately selected in consideration of compatibility with the printing method, adhesion to the object to be printed, safety when the content is food, and the like. .. Further, it is preferable that the surface of the base material layer (6) is subjected to an easy adhesion treatment such as a corona treatment to improve the adhesiveness with the printing layer (14). An overcoat layer may be provided on the print layer (14) in order to improve wear resistance.

(Layer structure)
Needless to say, the laminate constituting the present invention is not limited to the embodiment shown in FIG. Besides that, for example
Polyethylene terephthalate film with gas barrier layer (base material / gas barrier layer) / nylon film / unstretched polyethylene film (thermoplastic resin layer) / biaxially stretched polyethylene terephthalate film (sealant layer),
again,
Polyethylene terephthalate film (base material) / aluminum foil (gas barrier layer) / unstretched polyethylene film (thermoplastic resin layer) / biaxially stretched polyethylene terephthalate film (sealant layer),
again,
Polyethylene terephthalate film (base material) / aluminum foil (gas barrier layer) / nylon film / unstretched polyethylene film (thermoplastic resin layer) / biaxially stretched polyethylene terephthalate film (sealant layer)
Etc., can be appropriately selected according to the required specifications.

(Spout)
FIG. 5 is a schematic partial cross-sectional view for explaining the spout portion of the pouch with a spout according to the present invention. The spout (1) is a plastic molded product and is made of a polyester resin. On the innermost layer side of the container, the sealant layer (7) of the laminated body is heat-welded by heat sealing, and the opening (15) is exposed to the outside of the container and mounted. The heat welding of the spout (1) to the sealant layer (7) can be performed by ultrasonic welding, impulse sealing, or the like in addition to heat sealing.

As the polyester resin used as the spout material, not only a resin composed of polyethylene terephthalate alone, but also a modified polyethylene terephthalate resin obtained by polymerizing isophthalic acid, naphthalenedicarboxylic acid, cyclohexanedimethanol, neopentyl glycol and the like can be preferably used.

The spout (1) can be opened and closed in combination with a screw type or fitting type cap (5). The cap (5) can be made of polyester resin, polyethylene resin, aluminum, or the like. Further, a foamed polyethylene film (51) and a biaxially stretched polyethylene terephthalate film (52) laminated on the cap (5) as packing (50) are attached so that the biaxially stretched polyethylene terephthalate film is on the side in contact with the contents. Then, it is suitable for improving the sealing property and low adsorption property of the contents.

<Example 1>
A prototype pouch with a spout having a spout in the center of the top of the pouch was prototyped as follows.
・ Pouch layer structure (in the order of pouch outer layer side → inner layer side)
SiO-deposited polyethylene terephthalate film (thickness 12 μm) /
Nylon film (thickness 15 μm) /
Low density polyethylene film (thickness 30 μm) /
Biaxially stretched polyethylene terephthalate film (thickness 12 μm)
4 layers were formed and bonded by dry lamination.
-Created by injection molding using spout PET-G resin (glycol-modified polyethylene terephthalate resin).
-Made of cap aluminum.
The packing is made by laminating a biaxially stretched polyethylene terephthalate film on foamed polyethylene.
-Shape A four-sided pouch shape.

<Example 2>
・ Pouch layer structure (in the order of pouch outer layer side → inner layer side)
SiO-deposited polyethylene terephthalate film (thickness 12 μm) /
Aluminum foil (thickness 9 μm) /
Low density polyethylene film (thickness 50 μm) /
Biaxially stretched polyethylene terephthalate film (thickness 12 μm)
-A pouch was prepared in the same manner as in Example 1 except for the above.

<Comparative example 1>
・ Pouch layer structure (in the order of pouch outer layer side → inner layer side)
SiO-deposited polyethylene terephthalate film (thickness 12 μm) /
Nylon film (thickness 15 μm) /
Low density polyethylene film (thickness 80 μm)
3 layers were formed and bonded by dry lamination.
-Spout and cap Made by injection molding using low density polyethylene resin.
-A pouch was prepared in the same manner as in Example 1 except for the above.

<Comparative example 2>
-A pouch was prototyped in the same manner as in Example 1 except that the spout was prepared by injection molding of a low-density polyethylene resin.

<Comparative example 3>
・ Pouch layer structure (in the order of pouch outer layer side → inner layer side)
SiO-deposited polyethylene terephthalate film (thickness 12 μm) /
Aluminum foil (thickness 9 μm) /
Nylon film (thickness 15 μm) /
Biaxially stretched polyethylene terephthalate film (thickness 12 μm)
It has a three-layer structure.
-A pouch was prepared in the same manner as in Example 1 except for the above.

Each sample of the pouch prepared as described above was filled with sweet potato shochu and evaluated as follows.
-Static pressure test A pressure of 100 kg was applied to the pouch and held for 1 minute, and the presence or absence of liquid leakage was confirmed.
-Aroma component adsorption evaluation After storage at 30 ° C for 3 months, the amount of fatty acid ester contained in the content component was measured with a gas chromatograph mass spectrometer. The value before the evaluation test was set to 100, and the evaluation was made by comparison with the value after the evaluation test.

The results are summarized in Table 1.

As shown in Table 1, according to the present invention, the residual amount of fatty acid ester is larger than that of Comparative Example 1 in which the innermost layer is a low-density polyethylene film, that is, the adsorption of the flavor component of the content is less, and the innermost layer is adjacent to the innermost layer. It was confirmed that by arranging the unstretched polyolefin film, it was possible to obtain a pouch with a spout that could be heat-welded without gaps at the welded portion of the spout and the contents would not leak. On the other hand, in Comparative Example 1, although the contents could be sealed, the scent component was adsorbed, in Comparative Example 2, the spout could not be heat-welded and the contents could not be sealed, and in Comparative Example 3, the spout was heat-welded. Was not completely possible, and the contents leaked.

1 ... Spout 2 ... Body 3 ... Top 4 ... Bottom 5 ... Cap 6 ... Base Material layer 7 ... Sealant layer 8 ... Thermoplastic resin layer 9 ... Gas barrier layer 13 ... Adhesive layer 14 ... Printing layer 15 ...・ ・ ・ Opening 20, 21 ・ ・ Spout 22, 23 ・ ・ Heat seal part 50 ・ ・ ・ Packing 101 ・ ・ ・ ・ Pouch with spout 102 ・ ・ ・ ・ Laminated body

Claims (3)

A pouch with a spout in which laminated bodies are attached to each other, and the innermost layer of the pouch of the laminated body is a sealant layer made of a polyethylene terephthalate film having a heat-sealing property with a fine structure formed on the inner surface of the pouch. Adjacent to the sealant layer, there is a thermoplastic resin layer of an unstretched polyolefin film having a thickness in the range of 30 μm or more and 50 μm or less, and a spout made of polyester resin is heat-welded to the sealant layer. Pouch with spout to do. The pouch with a spout according to claim 1, wherein the sealant layer is a biaxially stretched polyethylene terephthalate film. The pouch with a spout according to claim 1 or 2 , wherein the sealant layer selectively has a heat-sealing property only on a heat-welded portion of the laminate.

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