JPH05278737A - Production of vessel with wide opening and the vessel - Google Patents

Abstract

PURPOSE:To obtain a multi-layer thin vessel with a wide opening of which cost is reduced. CONSTITUTION:The production of this vessel with a wide opening is composed of a process in which a monolayer or a multi-layer hollow blow-molded product is made so as to get a collar provided with at least one folded-back part 6 at a part of the shell 2, a process in which a vessel 10 with a wide opening is obtained by removing the upper part except the collar 5 of the blow-molded product, and a process in which the folded-back part 6 of the collar 5 of the vessel 10 with a wide opening is unified. A monolayer or a multi-layer bottom 3 and the shell 2 can be obtained by the blow-molding and the collar provided with at least one folded-back part 6 is attached at the upper edge of the opening 4 extending to the shell 2. And then the folded-back part 6 of this collar 5 is unified as a unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a wide-mouthed container suitable as a container for storing foods, pharmaceuticals, cosmetics and the like, and a container.

[0002]

2. Description of the Related Art Conventionally, a parison is placed in a mold,
A blow molding method is widely known in which air is pumped into the parison to inflate the parison to obtain a thin-walled molded container having a desired shape. Further, according to such a blow molding method, a container capable of improving the gas barrier property and protecting the contents contained in the container from bacteria etc. by achieving the multilayer structure of the container by using the multilayer parison. Can be obtained.

By the way, according to the above-mentioned blow molding method,
In order to pump air from the upper end of the parison into the parison and inflate the parison effectively according to the inner shape of the mold, the container mouth that is the air inlet into the parison is compared to the container body. Therefore, the above-mentioned blow molding method may be suitable for forming a container having a wide mouth, for example, a wide-mouth container having a container mouth portion having a diameter of about the same size as the body portion of the container. There wasn't.

[0004]

Therefore, according to the prior art, it has not been possible to suitably obtain a thin-walled wide-mouthed container and a multilayered wide-mouthed container. For this reason,
Conventionally provided wide-mouthed containers include glass bottles and aluminum obtained by inflating glass in a molten state,
There was only a metal can obtained by processing a metal such as a steel plate. These glass bottles and metal cans have drawbacks in that they are significantly inferior in cost as compared with containers obtained by the blow molding method.

The present invention has been made in view of the above-mentioned problems, and provides a manufacturing method and a container capable of obtaining a thin-walled wide-mouthed container and a multi-layered wide-mouthed container while reducing the cost. The purpose is to do.

[0006]

Therefore, in the method for manufacturing a wide-mouthed container according to the invention as defined in claim 1, one or more layers having a collar portion provided with at least one folded portion in a part of the body portion thereof are provided. A step of obtaining a hollow blow-molded article, a step of removing an upper portion of the blow-molded article excluding the collar portion to obtain a wide-mouth container, and a step of integrating the folded-back portion of the collar portion of the wide-mouth container. The above-mentioned problem is solved by having a configuration including the following.

Further, in the container according to the second aspect of the present invention, a single or multi-layered bottom portion and a body portion are obtained by blow molding, and a collar portion having at least one folded portion at the mouth portion continuing to the upper end of the body portion is provided. Was provided and the folded-back portion of the collar portion was integrated to be a means for solving the above-mentioned problems.

[0008]

According to the present invention, a blow molding is used to obtain a thin one-layer or multi-layer blow molding product. By removing the upper portion of the body of the blow molding product except for the collar portion, the thin molding is achieved. It is possible to obtain a single-layer or multi-layer wide-mouthed container, and by integrally forming one or more folded portions in the collar portion, the collar portion can be formed thick while forming the body and the bottom thin, and the gas barrier is lightweight. It is possible to obtain a wide-mouth container that is excellent in usability and is easy to use.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings in accordance with the procedure of the method for manufacturing a wide-mouthed container according to the present invention.

First, a blow-molded product 1 having a desired shape shown in FIG. 1 is thin-wall molded by a blow molding method. This blow-molded product 1 is obtained by arranging a parison having two inner and outer layers inside the mold, and inflating the parison inside the mold while sending air into the parison.
As shown in FIG. 1, the blow-molded product 1 is a bottomed container having a thin body portion 2 and a bottom portion 3, and a mouth portion 2a continuing from the body portion 2 is suitable for blow molding. It has a narrow mouth compared to. Further, a collar portion 5 that goes around the body portion 2 is provided in the middle of the body portion 2. This collar part 5
Has at least one folded portion 6 (two locations in this embodiment).

Next, the blow-molded product 1 is taken out from the mold, and the upper part of the body part 2 from the collar part 5 is cut by a cutting means such as a cutter. As a result, a thin, two-layer wide-mouth container 10 having the cut portion of the blow-molded product 1 as the mouth portion 4 is obtained.

Next, as shown in FIG.
0 is supported by the jig 20. This receiving jig 20
Serves as a work table for performing an operation of integrating the folded-back portion 6 of the collar portion 5 of the wide-mouthed container 10, and the body portion 2 of the wide-mouthed container 10 is inserted and arranged from above into the circular concave portion at the center of the receiving jig 20. At the same time, the wide-mouthed container 10 is supported by placing the collar portion 5 of the wide-mouthed container 10 on the flat upper surface of the receiving jig 20.

Next, the press plate 21 above the receiving jig 20 is lowered to press the flange portion 5 of the wide-mouthed container 10 between the lower surface of the press plate 21 and the upper surface of the receiving jig 20 under heating to thereby make the flange. The folded-back portion 6 of the portion 5 is integrally welded over the entire circumference. As a result, the desired wide-mouthed container 10 shown in FIG. 3 is obtained.

FIG. 4 shows a refill container obtained by filling the above wide-mouthed container 10 with contents and then welding a seal 12 made of aluminum or the like which covers the entire upper surface of the collar 5 to close the upper end of the mouth 4. 11 is shown. In this refill container, the contents are filled in the container and the seal 12 is placed on the upper surface of the collar 5 before welding the folded-back portion 6 of the collar 5 of the wide-mouthed container 10, and the receiving jig 20 It is obtained by pressing the flange portion 5 between the press plate 21 and the press plate 21 and integrally welding the seal 12 and the flange portion 5. Further, FIG. 5 shows a cross section of a main part of the collar portion 5 of the refill container 11. However, even when the refill container 11 is composed of two layers of the inner layer a and the outer layer b, the materials of the inner and outer layers are the same. Therefore, the integrity of the folded-back portion 6 of the collar portion 5 is secured by welding.

According to such a refill container 11, since the collar portion 5 around the mouth portion 4 is thickly formed and sufficient rigidity of the collar portion 5 can be secured even if the body portion 2 is thinly molded, after filling the contents. The seal 12 can be suitably peeled off without holding the collar portion 5 and keeping the overall shape of the collar portion 5. further,
Even if the body 2 is thin, since it is formed in multiple layers, it has excellent gas barrier properties and can sufficiently protect the contents.

FIG. 6 shows one usage form of the refill container 11. The container shown in FIG. 6 is used as a cream container, and is composed of a hard case 20 and a cap 21. With the cap 21 removed, the refill container 11 with the seal 12 removed is inserted and arranged in the hard case 20. It is designed to be used. Further, when the contents are exhausted, the refill container 11 can be replaced with a new one.
Reference numeral 22 indicates a packing which is attached to the back surface of the cap 21 and holds the interior of the refill container in a liquid-tight manner.

According to this embodiment, the following effects can be obtained.

(1) By the blow molding method, it is possible to obtain a thin-walled, multi-layer wide-mouth container 10 which could not be obtained conventionally. As a result, it is possible to obtain a wide-mouthed container that is lightweight and has no waste of material, and that has excellent gas barrier properties. Particularly, a wide-mouthed container for food containers and cosmetic containers that requires hygiene of bacteria. Can be provided.

(2) Further, in the blow molding method, the blow molded product 1 obtained in the mold is cut off at its upper portion to leave a collar portion 5 having one or more folded portions 6 and a wide-mouth container. Therefore, it is possible to manufacture the wide-mouthed container 10 at a low cost without needing a new capital investment because it can be used for the wide-mouthed container only by partially improving the existing blow molding die. You can

(3) Further, in the wide-mouthed container 10 obtained by the blow molding method, the folded-back portion 6 of the collar portion 5 is integrally welded so that the body portion 2 is thinly molded while the collar portion around the mouth portion is formed. 5 can be thick-walled to secure sufficient rigidity of the collar portion 5, whereby the seal 12 welded to the upper surface of the collar portion 5 can be peeled off satisfactorily, and a refill container having excellent usability can be provided.

(4) In addition, the seal 12 that closes the mouth when the flange 5 is welded is integrally welded together with the flange 5, so that the flange 5 and the seal 12 are welded at the same time. And the manufacturing process is omitted, and the refill container 1 is manufactured.
1 can be manufactured easily and at low cost.

[0022]

As described above, according to the present invention,
By the blow molding method, a thin, multi-layered wide-mouthed container can be obtained. As a result, it is possible to obtain an excellent effect that a manufacturing cost is low, a gas barrier property is excellent, and a wide mouth container suitable as a refill container can be obtained.

[Brief description of drawings]

1 is a cross-sectional view of a blow molded product obtained in the first step of manufacturing a wide-mouth container using the present invention.

FIG. 2 is a diagram showing a process of welding a flange portion of a wide-mouthed container obtained by cutting a portion above a flange portion of a blow-molded product.

FIG. 3 is a cross-sectional view of a wide-mouth container obtained by welding a flange portion.

FIG. 4 is a partial cross-sectional view of a refill container.

5 is a cross-sectional view of essential parts of the refill container of FIG.

FIG. 6 is a view showing a usage pattern of the refill container.

[Explanation of symbols]

 1 Blow-molded product 2 Body part 3 Bottom part 4 Mouth part 5 Collar part 6 Folding part 10 Wide mouth container 11 Refill container 12 Seal.

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Claims (2)

[Claims] 1. A process for obtaining a hollow blow-molded article (1) of one or multiple layers, comprising a collar portion (5) having at least one folded portion (6) in a part of its body portion (2). And a step of removing the upper portion of the blow-molded product (1) excluding the collar portion (5) to obtain a wide-mouth container (10), and folding back the collar portion (5) of the wide-mouth container (10). And a step of integrating the parts (6) with each other. 2. A blow molding results in a single-layer or multi-layer body (2) and a bottom (3), and at least one fold (6) in the mouth (4) leading to the upper end of the body (2). ) Is provided, and the folded-back part (6) of the collar part (5) is integrated with the container.