JPH0796970A - Package - Google Patents

Abstract

PURPOSE:To provide a soluble packing material which is excellent in the film strength and the welding strength and which can contain liquid, powder, particles, solid, etc., as the contents, increase the accuracy of external dimensions, minimize the shape and enable automatic filling operation. CONSTITUTION:A number of recessed containing parts 8 are connected to each other through flanges in the longitudinal direction of a container. The container made of polyvinyl alcohol resin having a saponification value of 50% or more and a polymerization degree of 100-3000 are continuously unified under heat and pressure with a long top tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package made of polyvinyl alcohol resin as a base material, and more particularly to a package which can be stably filled with an oily liquid as a content and can be dissolved in cold water, hot water or hot water. .

[0002]

2. Description of the Related Art Conventionally, a packaging body filled with powder such as powdered soap and bath agent, or liquid such as seasoning and pharmaceuticals, etc., containing the contents without taking out the contents. A package using a water-soluble film that is soluble in water, hot water, etc. is known because it has the advantage that it can be used as it is. As a package using such a water-soluble film, for example, as shown in JP-A-62-146174, water-soluble films formed of polyvinyl alcohol or starch are superposed and ultrasonic waves are applied to the four edges of the film. A package joined by a seal is disclosed.

[0003]

However, the package using the above-mentioned conventional water-soluble film has a thin film thickness of usually 0.02 to 0.06 mm, so that the structural strength of the film is weak and the film is It has the drawback of being damaged or broken, and because the package is joined by ultrasonic sealing, the welded part becomes a broken line, or the weld width becomes narrower than 1 mm, and the weld strength is weak and extremely reliable. Scarce, liquid as contents,
In particular, when the package is filled with the oily liquid, there is a problem that the content spills out from the gap of the welded portion after the filling and cannot be provided as a stable product. Furthermore, the conventional package has the disadvantages in quality and production that it is impossible to improve the accuracy of the outer dimensions or to minimize the shape, and it is also impossible to perform the automatic filling operation of the contents.

Therefore, the present invention is a package using a water-soluble film, which is excellent in film strength and welding strength.
It is a package that can stably fill liquids other than water, powders, granules, solids, especially oily liquids as contents, and improved external dimension accuracy, minimized shape, and automatic filling work. The challenge is to provide a package.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted trials and studies on the above-mentioned problems, and as a result, use a polyvinyl alcohol-based resin as a water-soluble film, specify the material thereof, and make a large number in the longitudinal direction. The inventors have found that the problem can be solved by forming a container having a concave container and pressing the surface of the container with a top tape to complete the invention. That is, the present invention is a storage body in which a large number of concave storage portions are connected in the longitudinal direction via a flange portion,
The degree of saponification is 50% or more, and the degree of polymerization is 100 to 3000.
The gist of the present invention is a packaging body obtained by continuously joining and integrating a storage body made of the polyvinyl alcohol resin with a long top tape.

The package of the present invention will be described below.
The container forming the package of the present invention uses a polyvinyl alcohol (hereinafter abbreviated as PVA) type resin and uses the resin sheet as a base material. However, as the PVA type sheet in the present invention, Polyvinyl acetate 50
~ 100% saponified, partially saponified, fully saponified PV
A, PVA derivatives obtained by lightly acetalizing, urethanizing, oxyethylating, cyanoethylating or sulfoacetalizing these PVA or PVA-based resins, or a small amount of ethylene, propylene, isobutyl, vinyl fluoride, vinyl chloride, styrene, methyl Examples include modified PVA obtained by saponifying a copolymer obtained by copolymerizing methacrylate and the like with a vinyl acetate monomer.

In the above PVA-based sheet, the saponification degree of this material is important, and a saponification degree of 50% or more, preferably 60% or more is preferable because the solubility in water is good, and less than 50%. In the case of, it is difficult to dissolve in water, which is not preferable. Also, the degree of polymerization of this material is 10
It is in the range of 0 to 3,000, preferably in the range of 500 to 2,000, and if the degree of polymerization is less than 100, the sheet strength will be inferior, and if it is more than 3,000, the sheet molding will be difficult, such being undesirable.

In addition to the above-mentioned materials, the package of the present invention contains, in addition to the above materials, carboxymethylcellulose, if necessary.
Cellulose derivatives such as hydroxyethyl cellulose, chitosan derivatives, starch, xanthan gum, polysaccharides such as carrageenan, polyacrylic acid or its derivatives, polyacrylamide, poly-N-vinylpyrrolidone, styrene-
Maleic anhydride copolymer, water-soluble resin such as water-soluble polymer such as polyethylene oxide, polyhydric alcohol such as glycerin and ethylene glycol, plasticizer such as ethanolamine, nonionic or aionic surfactant, and a small amount of ultraviolet ray Additives such as an absorbent, a colorant, a lubricant, a filler, a deterioration inhibitor, and other resin components can be added. Furthermore, in the case of a resin component that can be mixed with this PVA-based resin, a blend or alloy sheet can be used depending on the application as long as the water solubility is not impaired.

The package of the present invention is formed by molding a PVA-based sheet using the above-exemplified materials as a base material, and forming a large number of recessed storage portions at a constant pitch in the length direction to form a storage body, which is continuously formed with a top tape. It is a package obtained by pressure bonding. As shown in FIG. 1, after preheating a PVA-based sheet, this package is press-formed to form concave portions continuously at a constant pitch and automatically fills contents such as powder, granules, solids and liquids. Then, it is pressure-bonded with a top tape to obtain a package, and the package is wound as it is on a reel or individually cut at a flange portion to be used as an individual package.

The PVA-based sheet of the present invention is obtained by a melt extrusion method, a melt casting method or the like, and its thickness is usually preferably in the range of about 0.010 to 5.0 mm from the viewpoint of film strength or cost. .

The top tape used in the package of the present invention is a long tape that fits the container, and it is preferable to use a PVA-based film of the same material as the container, and what if the container can be sealed. Any material such as polyethylene, ethylene-vinyl acetate copolymer and styrene-butadiene-styrene copolymer may be used. This top tape is joined and integrated with the container by pressure bonding to obtain a package. This crimping method is a method of directly thermocompression-bonding using a heat seal bar or the like, a method of coating and crimping a strong adhesive consisting of a conventionally known thermoplastic or thermosetting resin on a film, and instead of the adhesive. Examples include a method of applying a hot melt adhesive and pressure bonding.

A heat seal bar is usually used for crimping the top tape and the container, and the material and shape are not particularly limited as long as the top tape can be crimped to the container. The thickness of the top tape is usually 0.005
The range of 1.0 mm, preferably 0.02 to 0.1 mm is suitable from the viewpoint of workability such as strength of the top tape or time for heating the top tape to the melting point.

In the package of the package of the present invention, in order to connect a large number of concave storages in the longitudinal direction, in addition to the press molding described above, vacuum forming, pressure forming, vacuum pressure forming, plug-assisted vacuum forming are possible. Any molding method such as the above may be selected.

Next, the package of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall explanatory view showing an example of an apparatus for producing a package of the present invention, FIG. 2 is an explanatory view of a heating machine in the apparatus, and FIG. 3 is a longitudinal sectional view showing details of a press molding machine. FIG. 4 is a perspective view of a storage body that constitutes the packaging body of the present invention.

As shown in FIGS. 1 and 2, the PVA-based sheet 2 delivered from the delivery roller 1 first has a heater 3 having a heater 4, a heat shield plate 5, and an intermediate plate 6.
It is sent to the gap 7. The heat shield plate 5 has an opening 9 at a position corresponding to the concave storage portion 8 provided in the PVA-based sheet 2.
And has both side portions (flange portions) of the PVA-based sheet 2
It is in close contact with the middle plate 6 with the pinch in between. Since the intermediate plate 6 is cooled by the cooling medium circulating passage 11, the connecting portions (flange portions) 12 connecting the both side portions 10 of the PVA-based sheet 2 and the concave storage portion 8 are cooled, and only the concave storage portion 8 is opened. It is radiantly heated by a heater through 9 and the others are kept at a sufficiently low temperature.

Next, the PVA type sheet 2 is fed into the press molding machine 13, and as shown in FIG. 3, this molding machine 13 comprises a male mold 14 and a female mold 15, and the male mold 14 has a concave accommodating portion. 8 is provided with a press piston 16 and a feed hole pin 18 for forming the feed hole 17, and the female die 15 has a piston hole 19 containing the press piston 16 and a feed hole drilling pin 18.
Is formed, and the bottom portion of the piston hole 19 has an ejection rod 21 for extruding the PVA-based sheet 2 after forming the concave housing portion.

Further, the press piston 16 is prevented from bulging the concave housing portion 8 due to air flowing around the male mold 14 and the surface of the PVA type sheet 2 during press molding, thereby preventing the male mold 14 and PV from being bulged.
An air escape hole 22 having a diameter of about 1 mm is provided in order to accurately form the concave storage portion 8 in order to improve the adhesion of the A-type sheet. Here, the air vent hole 22 is preferably located above the PVA-based sheet 2 because it is necessary for air to escape when the male die reaches the bottom dead center.

Next, the PVA-based sheet 2 is fed to the intermittent feeding device 23. Here, the PVA-based sheet 2 is used.
Both side parts 10 are fixed, and the press molding is repeated by intermittently transferring a predetermined length by the air feeder 24.

By the molding process as described above, it is possible to manufacture a storage body having a high dimensional accuracy in which the concave storage portion 8 as shown in FIG. 4 is connected via the flange portion 25. A package is obtained by pressing the surface of this container with a top tape. Further, only the portion of the PVA-based sheet 2 that is to be embossed is heated, and the portion that is heat-bonded to the top tape as a lid material after the contents are stored becomes a non-heated area, and has sufficient smoothness to provide stable adhesive strength. Can be obtained.

[0020]

The package of the present invention is excellent in film strength and welding strength by pressing the container using the PVA resin of a specific material with the top tape, and is stable even if the content is powder, fluid, or oily liquid. Can be stored in. Also,
By applying the conventional molding method, the dimensional accuracy can be improved, the shape can be minimized, and the automatic filling property of the contents can be realized.

[0021]

【Example】

(Example 1) A PVA sheet having a saponification degree of 88% and a polymerization degree of 600 and a thickness of 0.3 mm is set to a heater set temperature of 600.
C, the cooling medium temperature was 18 ° C., the molding cycle was 1 second / time, the number of molds was 20, and the intermittent feed amount was 80 mm / time, to form a package body having an emboss depth of 3 mm. Next, the PVA
A top tape having the same quality as the sheet and a thickness of 0.03 mm was thermocompression-bonded to the surface of the container at 280 ° C. for 1 second, and a stable package could be manufactured. This package was dissolved in cold water at 30 ° C.

Example 2 A saponification degree of 93% and a polymerization degree of 1
A PVA sheet 320 having a thickness of 0.4 mm was molded into a container having an emboss depth of 5 mm under the same conditions as in Example 1 except that the heater temperature was 650 ° C. Next, a top tape having the same quality as the PVA sheet and a thickness of 0.03 mm was thermocompression-bonded to the surface of the container at 280 ° C. for 1 second, and a stable package could be manufactured. This package was dissolved in hot water at 70 ° C.

(Example 3) A PVA sheet having a saponification degree of 99.9% and a degree of polymerization of 1680 and a thickness of 0.2 mm was used under the same conditions as in Example 1 except that the heater set temperature was 600 ° C and the emboss depth was 1 mm. The container of was molded. Next, the PVA
A top tape having the same quality as the sheet and a thickness of 0.02 mm was thermocompression-bonded to the surface of the container at 260 ° C. for 1 second, and a stable package could be manufactured. This package was dissolved in hot water at 95 ° C.

(Example 4) A PVA-maleic acid-allyl modified sheet having a saponification degree of 83% and a polymerization degree of 850 having a thickness of 0.4 mm was embossed under the same conditions as in Example 1 except that the heater set temperature was 650 ° C. When a soluble packaging container having a depth of 5 mm is formed, a stable packaging can be manufactured,
This was dissolved in warm water at 45 ° C.

(Example 5) The surface of the container of Example 1 and a styrene-butadiene-styrene top layer having a thickness of 0.03 mm composed of polyester and styrene-butadiene-styrene copolymer in a ratio of 1: 2. The surface of the copolymer was subjected to thermocompression bonding at 280 ° C. for 1 second, and a stable package could be manufactured. Next, the top tape of the package was peeled off to take out the container, and the container was dissolved in hot water at 30 ° C.

[0026]

EFFECTS OF THE INVENTION According to the package of the present invention, since it is a package having the above structure, it has excellent film strength and welding strength, and contains oily liquid as a content, fluids other than water, powder, and granules. In addition to stable filling of solids, leakage of contents is eliminated, and conventional molding methods can be applied and used to improve external dimensional accuracy, minimize shape, and perform automatic filling work. A package that can deal with a problem can be provided.

[Brief description of drawings]

FIG. 1 is an overall explanatory view showing an example of an apparatus for producing a package of the present invention,

FIG. 2 is an explanatory view of a heating machine in the apparatus of FIG.

FIG. 3 is a vertical cross-sectional view showing details of a press molding machine,

FIG. 4 is a perspective view of a storage body that constitutes the packaging body of the present invention.

[Explanation of symbols]

 1 Feeding Roller 2 PVA-based Sheet 3 Heating Machine 4 Heater 5 Heat Shielding Plate 6 Middle Plate 7 Gap 8 Concave Storage Section 9 Opening 10 Both Sides 11 Cooling Medium Passage Path 12 Connecting Section 13 Press Molding Machine 14 Male Model 15 Female Model 16 Press piston 17 Feed hole 18 Feed hole drilling pin 19 Piston hole 20 Pin hole 21 Extruding rod 22 Air escape hole 23 Intermittent feeding device 24 Air feeder 25 Flange part

Claims (1)

[Claims] 1. A storage body in which a large number of concave storage portions are connected in the longitudinal direction via flange portions, and the degree of saponification is 50%.
The above is a package in which a container made of polyvinyl alcohol resin having a degree of polymerization of 100 to 3000 is continuously joined and integrated with a long top tape.