JPH07156188A - Production of container - Google Patents

Abstract

PURPOSE:To ensure a shape stability of a container by integrally joining an intermediate barrel part to a plastic molded part without using an adhesive. CONSTITUTION:An intermediate barrel part 2 of a plastic laminated film shaped into a cylindrical shape is made to adhere to a mandrel 6 serving as a core. The mandrel 6 with the intermediate barrel part 2 adhering is set in an upper mold 11 and a lower mold 8. A melt plastic resin material is injected into the upper and lower molds by an insert injection molding means. In this manner, an upper molded part 3 and a lower molded part 4 are integrally joined to the end parts of the intermediate barrel part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a container, for example for molding a container suitable for encapsulating powdered coffee.

[0002]

2. Description of the Related Art For example, as a container for enclosing a solid substance that does not like moisture such as powdered coffee, it is necessary to construct the container itself from a moisture impermeable material. Therefore, a glass container, a metal can or a blow molding is required. Used plastic containers.

Since glass materials are impermeable to moisture and oxygen,
The glass container has excellent moisture resistance and gas barrier properties and is therefore highly preserved.However, since the glass container retains its original shape after use and is heavy in weight, it is not suitable for disposal of used glass containers. There is a problem in weight and volume in terms of waste disposal. Similarly, metal cans also have problems in weight and volume when disposing of used metal cans.

Further, the blow-molded plastic container can solve the drawbacks of the weight and volume of the glass container and the metal can when the used container is discarded, but with the current blow-molding technology, Molded plastic containers cannot be made thin with a wall thickness of about 0.7 mm or less, and in consideration of moisture resistance and gas barrier properties, a barrier base material such as EVAL and polyethylene, polypropylene, etc. as synthetic resin materials. It is limited to co-extruded blow molding products, and blow molding with composite materials of synthetic resin materials and metal materials such as aluminum is difficult with current blow molding technology.

Therefore, a pouch-shaped plastic container was developed using a plastic laminate film excellent in moisture proof and gas barrier properties. This kind of plastic container solves the problems of moisture proof and gas barrier by using plastic laminate film as a material with excellent moisture proof and gas barrier properties. Moreover, due to the flexibility of plastic laminate film, it is compact. Since it can be deformed into various shapes, it is possible to eliminate the difficulty of the weight and volume possessed by the glass container and the metal can in terms of dust disposal.

[0006]

Since the pouch-shaped plastic container has a light weight as a whole and the volume after use is reduced, the problem in terms of waste disposal when the used container is discarded should be solved. However, since it is made of a plastic laminate film, it has a lot of flexibility, and there is a problem in the stability of the shape of the container, and the amount of the contents remaining in the container after opening the container and removing the contents decreased. In this case, since the shape of the bottom of the container is also unstable, it is difficult to take out the contents remaining at the bottom of the container even with a spoon.

The present invention has been made in view of the above-mentioned points. The upper and lower parts are made of a plastic molding part, and the intermediate body part is made of a plastic laminate film so as to form a tubular shape. The adhesiveness of the container is integrated without using an adhesive to ensure the stability of the shape of the container, and by ensuring the stability of the shape, it is easy and reliable to take out the contents after opening. An object of the present invention is to provide a container manufacturing method that solves the problem of waste disposal when discarding used containers.

[0008]

According to the method of manufacturing a container of the present invention, a cylindrical intermediate body formed by using a plastic laminate film as a material is attached to a mandrel serving as a mold core, and the intermediate body is formed. Attach the mandrel with the upper and lower molds, and inject the molten plastic resin material into the upper and lower molds by insert injection molding means to integrate the upper molding part and the lower molding part at the end of the intermediate body part. It is composed by combining them.

[0009]

In the container manufacturing method of the present invention, since the upper molding portion and the lower molding portion are integrally joined to the intermediate body portion by the insert injection molding means, the intermediate body portion and the upper molding portion are not used with an adhesive. Also, the intermediate body portion and the lower molding portion are firmly adhered to each other, no wrinkles are formed at the joint portion of the intermediate body portion, and the intermediate body portion is integrally coupled to the lower molding portion, so that the intermediate body portion is The shape is stable, and the range of material selection for the plastic laminate film forming the intermediate body portion is wide, so that it is possible to manufacture a container according to the purpose of use.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show an example in which the method for producing a container according to the present invention is applied to a coffee container. The coffee container 1 includes an intermediate body portion 2 formed of a plastic laminate film and an intermediate body portion 2 thereof. The upper molding part 3 is integrally molded at one end of the intermediate body 2 and the lower molding part 4 is integrally molded at the other end of the intermediate body 2.
The opening 3a provided in the upper molding portion 3 is sealed by the lid member 5, and if a screw portion is provided on the outer surface of the upper molding portion 3, the lid can be screwed.

The intermediate body portion 2 is made of a material obtained by cutting a plastic laminate film into a rectangular shape, and side edges of the material are joined to each other in an envelope pasting type to form a tubular shape with both ends opened. The intermediate body portion 2 may be formed by abutting the side ends of the material and joining them in a palm-sealing type so as to form a tubular shape with openings at both ends. The end located on the bottom side of the intermediate body portion 2 thus formed is heat-sealed by a normal heat-sealing means.

The above plastic laminate film is
Considering moisture resistance, gas barrier property and flexibility,
Laminated polyethylene film with a thickness of 50 microns, polyester film with a thickness of 12 microns, aluminum foil with a thickness of 9 microns and polyethylene film with a thickness of 50 microns, or a polyethylene film with a thickness of 50 microns and a thickness of 50 A laminate of micron paper, 9 micron thick aluminum foil and 50 micron thick polyethylene film is selected.

Next, a method of manufacturing the coffee container 1 will be described. The coffee container 1 is required to have a moisture-proof property and a gas-blocking property as the container because the powdered coffee to be enclosed dislikes changes in moisture and aroma. Therefore, a plastic laminate film considering moisture resistance, gas barrier property, and flexibility is selected as the intermediate body portion 2 constituting the coffee container 1, and the bottom portion has moisture resistance and gas barrier property similar to the intermediate body portion 2. A cylindrical shape with one end opening is selected so as to secure the property.

The intermediate body portion 2 having one end opening formed of a plastic laminate film selected in consideration of moisture proofness, gas barrier property and flexibility has an upper end 2a closed to a mandrel 6 serving as a mold core. Then it is applied from above. In this case, if the intermediate body 2 has a circular cross section,
A circular mandrel corresponding to this is also used in the intermediate body 2
If is a rectangular section, a rectangular mandrel corresponding to this is used.

Next, as shown in FIG. 3, the mandrel 6 which covers the intermediate body 2 is attached to a lower mold 8 having a space having a shape corresponding to the upper molding portion 3 of the coffee container 1, and the intermediate body 2 is formed. An intermediate portion above the lower mold 8 of the mandrel 6 that covers 2 is pressed by the lower pressing plate 9 and the upper pressing plate 10 provided at intervals over the entire circumferential surface. As a result, a molding space 7 surrounded by the mandrel 6, the lower die 8 and the lower pressing plate 9 is defined.

Next, the upper die 11 provided with a space having a shape corresponding to the lower molding portion 4 is mounted on the lower die 8 to form the intermediate body portion 2.
Is attached to the tip portion of the mandrel 6 having the exterior. As a result, the mandrel 6, the upper mold 11, and the upper pressing plate 10
A molding space 12 surrounded by is defined. The molding space 12 and the molding space 7 are communicated with each other by a runner 13 provided in the mold.

When the upper body 11 and the lower die 8 of the intermediate body 2 have been set, a synthetic resin such as a polyethylene resin is inserted into the molding space 12 from the gate opening 13 provided in the upper die 11 by insert injection molding means. The material is poured in the molten state. At the same time, the molten synthetic resin material injected into the molding space 12 passes through the runner 13 and
Will also be introduced. As a result, the upper molding portion 3 and the lower molding portion 4 are integrally coupled to the bag body forming the intermediate body portion 2, and the coffee container 1 is manufactured.

The coffee container 1 made in this way
Since the same plastic laminate film as the body is also provided on the bottom, selecting a plastic laminate film that has an aluminum foil ensures moisture resistance and gas barrier properties regardless of the synthetic resin material. can do.

Further, by making the intermediate body of the coffee container 1 flexible, it becomes possible to judge the degree of vacuum by changing the shape of the body during vacuum packaging.

FIG. 4 shows an example in which the container manufacturing method according to the present invention is applied to a cartridge for a discharge gun.
The discharge gun cartridge 20 includes a main body portion 21 formed of a plastic laminate film in a tubular shape, an upper molding portion 23 integrally formed at the upper end of the main body portion 21 and provided with a mouth portion 22, and a main body portion 21. And an annular lower molding portion 24 integrally molded at the lower end of the. A pressing plate 25 can be fitted to the annular lower molding portion 24 if necessary.

In order to make the above-mentioned cartridge 20 for the discharge gun, the main body 2 is made of a plastic laminated film which does not act on the adhesive or the sealing material housed in the main body, and which is formed into a tubular shape with both ends opened. To be done. As shown in FIG. 5, the main body 21 having the openings at both ends is mounted on a mandrel 26 which serves as a mold core.

Next, the mandrel 26 which covers the main body 21 is an upper molding portion 23 of the discharge gun cartridge 20.
The mold 27 is provided with a space having a shape corresponding to the above and a space having a shape corresponding to the lower molding portion 24. As a result, the lower molding part 2 surrounded by the mandrel 26 and the mold 27 is formed.
A molding space 24a for 4 is defined.

Next, from the upper side of the mold 27, the spacer 28
Is attached to the mold 27. As a result, a molding space 23a for the upper molding portion 23 surrounded by the mandrel 26, the mold 27 and the spacer 28 is defined. The molding space 23a and the molding space 24a are communicated with each other by a runner 28 provided in the mold 27.

When the setting of the main body 21 to the die 27 is completed, the runner 28 is passed through the gate opening 29 provided in the die 27.
A synthetic resin material such as polyethylene resin is injected in a molten state into the molding space 23a and the molding space 24a by insert injection molding means. This allows
The upper molding portion 23 and the lower molding portion 24 are integrally coupled to the main body portion 21 forming the intermediate barrel portion, and the discharge gun cartridge 20 having the lower end opening is manufactured.

The cartridge 2 for the discharge gun having the lower end opening
Cartridge 2 for discharge gun to fill 0 with adhesive
0 is attached to the filling machine so that the upper molding portion 23 is on the lower side and the mouth 22 provided in the upper molding portion 23 is gripped, and the adhesive poured out from the filling machine is discharged from the opening portion of the lower molding portion 24. When the inside of the main body 21 is filled with a predetermined amount of adhesive, the bottom cover 25 is fitted to the opening end of the lower molding portion 24 of the main body 21 to open the opening of the lower molding portion 24. Close. The bottom lid 25 also functions as a pressing plate that is pressed by the operating portion of the discharge gun. In order to prevent air from being mixed into the adhesive, the bottom cover 25 is fitted to the opening end of the lower molding portion 24 of the main body portion 21, and then the main molding portion 21 is evacuated to vacuum the main body portion 21. After pulling out the air in the internal space of
The inside of the main body portion is filled with the adhesive that is poured from the filling machine through the mouth portion 22 of the upper molding portion 23.

In the above-described embodiment, the intermediate body forming the main body of the discharge gun cartridge 20 has a cylindrical shape and is filled with an adhesive of one liquid. If the part 23 and the lower molding part 24 are structured to combine two semi-circular halves, the two liquid adhesives can be separately filled.

Even if the discharge gun cartridge 20 has the same structure, it can be used as a beverage container or a detergent container by selecting the material of the main body and the shape and size of the main body.

[0028]

As described above, according to the present invention, the intermediate body portion made of the plastic laminate film is
Since the upper molding part and the lower molding part are integrally connected by the insert injection molding means, the intermediate body part and the upper molding part and the intermediate body part and the lower molding part can be bonded without using an adhesive, The wrinkle is not formed at the joint part of the intermediate body of the container, the shape of the intermediate body is stable, and the range of materials for selecting the plastic laminate film forming the intermediate body is wide, so that it can be used for various purposes. It is possible to manufacture a suitable container.

Further, since the container has a flexible intermediate body, when the contents are vacuum-packed, the degree of vacuum of the container can be judged by the shape change of the body, for example, the deformation of the intermediate body. Defective packaging can be sorted.

[Brief description of drawings]

FIG. 1 is a perspective view of a coffee container made by the method for manufacturing a container according to the present invention.

2 is a cross-sectional view of the coffee container of FIG.

FIG. 3 is a diagram showing a method of manufacturing a container according to the present invention.

FIG. 4 is a partially broken view showing a cartridge container manufactured by the method for manufacturing a container according to the present invention.

FIG. 5 is a view showing another embodiment of the container manufacturing method according to the present invention.

[Explanation of symbols]

 1 Coffee 2 Middle Body 3 Upper Molding Part 4 Lower Molding Part 6 Mandrel 7 Molding Space 8 Lower Mold 11 Upper Mold 12 Molding Space

Claims (5)

[Claims] 1. A cylindrical intermediate body formed by using a plastic laminate film as a material is adhered to a mandrel which is a mold core, and the mandrel to which the intermediate body is adhered is used as an upper die and a lower die. Mounted on the upper mold part and the lower mold part by integrally injecting a molten plastic resin material into the upper mold and the lower mold by insert injection molding means, and integrally joining the upper molded part and the lower molded part to the end of the intermediate body part. Production method. 2. The method of manufacturing a container according to claim 1, wherein the intermediate body has a tubular shape with one end open. 3. The method of manufacturing a container according to claim 1, wherein the intermediate body has a tubular shape with openings at both ends. 4. The method for producing a container according to claim 1, wherein a metal foil is interposed in the plastic laminate film. 5. The method for producing a container according to claim 1, wherein the spout is formed integrally with the upper molding part or the lower molding part.