JP5108495B2 - Plastic container - Google Patents

Description

  The present invention relates to a laminated synthetic resin container (particularly for thin-walled containers) constituted by laminating a plurality of types of synthetic resins, from the mouth to the bottom of the container. In this area, the characteristics of the container itself are partially changed to further improve usability.

  Synthetic resin containers such as plastic bottles are used frequently as containers for drugs, cosmetics, liquor, beverages, seasonings, etc. because they can be produced efficiently and are relatively easy to handle. There are a wide variety of sizes and shapes.

  In recent years, in order to maintain the quality of the contents filled in the container at a high level, a barrier layer is laminated on the surface of the resin (polyethylene resin, etc.) constituting the mother layer to avoid intrusion of oxygen or the like. Functional containers have also been proposed.

By the way, in a container (such as Patent Document 1) that tears the knob and opens the container, such as a single-use type, the resin that forms the barrier layer is particularly stretched when the above-described laminated type is applied. For this reason, there is a case where it is impossible to surely tear off the picked piece, and there is a need for a solution.
JP 2001-114307 A

  An object of the present invention is to propose a novel synthetic resin container that can eliminate the above-described conventional problems that have occurred in a high-functional container provided with a barrier layer.

The present invention is a synthetic resin comprising two or more layers having a resin that forms a mother layer and a resin that is laminated on at least one of the inner and outer sides of the mother layer to form a barrier layer on the surface of the mother layer. A container,
The resin that forms the barrier layer forms a single-layer region of only the mother layer at one or more locations from the mouth to the bottom of the container ,
A synthetic resin container, characterized in that a knob or bottom formed so as to be torn off is provided in the single layer region .

  The synthetic resin container is advantageously adapted by extrusion, extrusion blow molding or injection blow molding.

  The resin that forms the mother layer includes polyethylene resin, olefin resin including polypropylene resin, or polyethylene terephthalate resin, and the resin that forms the barrier layer includes ethylene vinyl alcohol copolymer (EVOH) or nylon resin. .

  When a barrier layer is provided so as to form a single-layer region in which only the resin forming the mother layer is present, it is inevitable that the barrier property slightly decreases at that site, but reliable tearing is possible and the container can be opened. Not only is it easy, but it is easy to disassemble used containers.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a view showing an embodiment of a synthetic resin container according to the present invention by taking a tube container as an example, in which the reference numeral 1 is a trunk part of the container, and 2 is connected to the trunk part 1 via a shoulder 3 The spout 4 is a knob formed integrally with the spout 2 so as to be torn off.

  In the container having the above structure, the mother layer M that forms the skeleton of the container is made of polyethylene resin or the like, and the outer surface of the mother layer M is nylon resin in the region from the shoulder 3 to the lower part of the body part 1. A barrier layer N made of, for example, is formed.

  If the barrier layer N is provided in the region (L) from the shoulder 3 to the bottom of the container and the rest is a single-layer region consisting only of the mother layer M, the knob 4 can be reliably torn off. It is easy to open the container.

  In addition, when the region from the lower part to the bottom of the body part 1 of the container is a single layer region of the mother layer M, not only the remaining contents can be taken out by tearing the bottom part, but also the used container can be removed. It can be summarized in a compact.

  In a container in which the part from the lower part to the bottom of the body part 1 is a single-layer region of the mother layer M and the barrier layer N functions as a light-shielding layer, the single-layer region has light-shielding properties. It is also possible to attach a label, and in this case, the amount of resin required to form the barrier layer N can be reduced.

  In order to manufacture a container having the above-described configuration, for example, a coextrusion molding method in which different types of resins are appropriately joined with a time difference using a co-extrusion die is applied, and the barrier layer N is formed outside the base layer M. It may be provided not only on the surface but also on the inner surface or on both the inner and outer surfaces, and this point is appropriately set according to the contents to be filled.

  Also, a parison is formed by co-extrusion, and direct blow molding is performed on the parison (direct blow bottle, blow tube, etc.), or a resin corresponding to the mother layer M and a resin corresponding to the barrier layer N are respectively injected. It is possible to produce a container according to the present invention by forming a preform and subjecting the preform to biaxial stretch blow molding under predetermined conditions. It is not limited.

  In the embodiment of the present invention, the case where a single layer region (non-laminated region) is provided in the upper and lower portions in the axial direction of the container is exemplified, but the single layer region is only in either the upper portion or the lower portion, or It can also be provided only in the middle part. As a laminated form, a configuration in which the barrier layer N is disposed as an intermediate layer or a configuration in which an adhesive layer is provided between the mother layer M and the barrier layer N may be applied. If it is a layer region, the layer structure can be changed in any way.

  When manufacturing a tube or blow tube by the co-extrusion method, the layer thickness can be changed by adjusting the feed rate of the resin forming the base layer M and the barrier layer N.

  A laminated synthetic resin container that can be surely opened by tearing can be provided.

It is the figure which showed typically Embodiment of the synthetic resin container according to this invention in the cross section.

Explanation of symbols

1 Torso part
2 Outlet
3 shoulder
4 Pick pieces
M mother
N barrier layer

Claims (3)

A synthetic resin container comprising two or more layers having a resin that forms a mother layer and a resin that forms a barrier layer on the surface of the mother layer by being laminated on at least one of the inner and outer sides of the mother layer ,
The resin that forms the barrier layer forms a single-layer region of only the mother layer at one or more locations from the mouth to the bottom of the container ,
A synthetic resin container, characterized in that, in the single-layer region, a knob or bottom formed so as to be torn off is provided .   2. The synthetic resin container according to claim 1, wherein the synthetic resin container is formed by extrusion molding, extrusion blow molding or injection blow molding.   The resin forming the mother layer is a polyethylene resin, an olefin resin containing a polypropylene resin, or a polyethylene terephthalate resin, and the resin forming the barrier layer is an ethylene vinyl alcohol copolymer or a nylon resin. The synthetic resin container described in 1.

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