JPH10338269A - Bottle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a favorable deformed shape of an inside layer and obtain a hygienic use condition of a bottle body, by evenly and smoothly peel the inside layer against an outside layer as a whole and easily and rapidly discharge hot water which penetrates through a slit of the bottom. SOLUTION: A freely shrinkable inside layer 3 is peelably laminated within the outside layer 2 forming a definite outer shell and a slit 8 is formed at the pinch-off part of the outside layer 2 of the bottom 6 and further, an air vent hole 9 is opened at the outside layer 2 of the opening 4 to allow the outside air to flow into the gap between the inside layer 3 and the outside layer 2 from both upper and lower ends of the bottle body. In this way, the shrinking deformation of the inside layer 3 is made possible under the condition that liquid is contained and liquid which penetrates into the outside layer is smoothly and naturally discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer layer forming a fixed outer shell, and an inner layer forming a deformable inner bag is formed in a releasable manner on the outer layer to form an outer shell without changing the external shape and the content liquid. TECHNICAL FIELD The present invention relates to a synthetic resin blow-molded bottle that allows the content liquid to be poured out and used without allowing outside air to enter a storage section.

[0002]

2. Description of the Related Art A typical conventional technique of a synthetic resin blow-molded bottle in which an inner layer forming a deformable inner bag is releasably laminated on an outer layer forming a fixed outer shell is described below. There is a technique disclosed in JP-A-5-310265.

In this prior art, a slit formed by bonding inner layers and not bonding outer layers is formed on a bottom parting line, which is a die cutting portion formed when blow molding a bottle. Provided, when the content liquid stored in the inner layer is poured out and used, and when the inner bag formed by the inner layer is deformed to reduce the volume, the outside air is introduced between the outer layer and the inner layer through this slit, whereby the outer layer is It is intended that the separation of the inner layer can be smoothly achieved, and that the volume reduction and deformation of the inner layer can be easily and satisfactorily performed by using and discharging the content liquid.

[0004]

However, in the above prior art, the entrance of the outside air between the outer layer and the inner layer is only the slit opened on the bottom surface of the bottle, and the air flow between the inner layer and the outer layer. Hardly occurs, the separation of the inner layer from the outer layer is biased toward the periphery of the slit, and it is difficult to achieve smoothness on average as a whole, and therefore, there is a problem that the volume reduction deformation of the inner layer is also difficult to achieve smoothly. .

Further, when the bottle is used on a surface such as a bathroom where warm water is located, hot water enters between the outer layer and the inner layer through a slit opened in the bottom of the bottle, and the entrance of the outside air is caused by this. Since the inner and outer layers are easily decompressed only by the slit, there is a problem that invading hot water easily stays in the outer layer, which may cause inconvenience.

Accordingly, the present invention has been made to solve the above-mentioned problems in the prior art, and makes it possible to smoothly separate the inner layer from the outer layer on the whole and to penetrate through the slit at the bottom. It is an object of the present invention to easily and quickly discharge hot and cold water, thereby achieving a good deformation of an inner layer and obtaining a sanitary use of a bottle.

[0007]

Means for solving the above-mentioned problems of the present invention are as follows: a bottle formed by blow molding; an outer layer made of a synthetic resin forming a fixed outer shell;
A flexible synthetic resin inner layer laminated on the outer layer to form an inner bag, and an outer layer between the edges of the outer layer of the die cutting portion formed at the bottom of the lower end. A slit is provided as an inlet for the outside air between the inner layer and the inner layer, and an air intake hole for taking in the outside air between the outer layer and the inner layer is provided in the outer layer at the mouth at the upper end.

[0008] An outer layer forming a fixed outer shell and an inner layer forming a deformable inner bag for directly accommodating the content liquid are releasably laminated, and a bottom portion is provided between the outer layer and the inner layer. Since it is open to the outside by the slit and the air intake hole at the mouth, when a decompression occurs in the inner layer and the inner layer tries to deform in a direction to reduce its internal volume, it moves into the outer layer according to this deformation. The intrusion of outside air from the slits and the air intake holes and the flow of the outside air, the separation of the outer layer and the inner layer is not partially biased, the smoothness is achieved on average as a whole, and the deformation of the inner layer is Well achieved.

That is, since the air intake hole is located at the upper end of the bottle and the slit is located at the lower end of the bottle, the inner layer separates from the outer layer while the upper and lower ends are supported. Since the wiping deformation occurs, and the wiping deformation occurs in a state where the weight of the content liquid is constant, the wiping deformation can be achieved without difficulty and satisfactorily.

At this time, the outside air enters the outer layer through the slits and the air intake holes, and only the inner layer separates from the outer layer and deforms in a direction to reduce the volume. It maintains a fixed outer shell shape without deformation and keeps the appearance of the bottle constant.

Further, when the bottle is placed on the surface where the hot water is located, even if the hot water enters between the outer layer and the inner layer through the slit on the bottom surface, the slit and the air provided at the upper end portion are provided. Since the inside and outside layers are maintained at normal pressure due to the intrusion of outside air from the intake hole and the flow of the outside air, the intruded hot water is easily and quickly discharged from the slit, and does not remain in the outer layer for a long time.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The bottle 1 is blow-molded from a parison formed by extruding an outer layer 2 made of a high-density polyethylene resin and an inner layer 3 made of nylon into a laminated cylindrical shape by co-extrusion molding means, and the outer peripheral surface of a cylindrical mouth portion 4 is formed. Is provided with a thread for screwing a cap such as a cap with a pump.

A slit 8 is formed in the die cutting portion 7 on the parting line 6 at the bottom 6 of the bottle 1 so as to separate the cutting edges of the outer layer 2 so as to allow one outside air to enter. I have.

The mold cutting portion 7 is a blow mold which is a split mold, and is formed by cutting a part of an intermediate molded product of the parison before blow molding or the bottle 1 after blow molding. However, in this cutting, the inner layer 3 is cut while crushing the laminate of the outer layer 2 and the inner layer 3 in a state where the inner layer 3 is overlapped, so that the inner layers 3 are sufficiently welded to each other as shown in FIG. The outer layers 2 are hindered by a part of the inner layer 3 located therebetween, so that the cut edges are hardly brought into contact with each other.

[0015] Therefore, in addition to the fact that the outer layer 2 and the inner layer 3 are detachable, by appropriately applying a force to the die cutting portion 7 with a fingertip, the gap between the cutting edges of the outer layer 2 is reduced.
The slit 8 can be formed by separating the outer layer 2 and the inner layer 3 while separating them.

Further, an air intake hole 9 as another outside air inlet is formed at a lower portion of the mouth portion 4 located at an upper end portion of the bottle 1.

As a means for forming the air intake hole 9, for example, a hole is formed only in the outer layer 2 by punching to form the air intake hole 9, or the outer layer 2 is made of a synthetic resin material having a lower melting point than the inner layer 3. A punching jig formed and heated to a temperature equal to or higher than the melting point of the material of the outer layer 2 and lower than the melting point of the material of the inner layer 3 is pressed against the outer layer 2 of the mouth 4 of the bottle 1, and the outer layer 2 is pressed against the inner layer 3. Appropriate means such as a method of melting and forming the air intake hole 9 into the air can be used.

The air intake hole 9 is desirably provided at the mouth 4 of the bottle 1 as shown in the figure, but may be provided at a location located at the upper end of the bottle 1 close to the mouth 4. .

Since the air intake hole 9 is provided in the mouth portion 4, the air intake hole 9 can be covered and covered by a cap, so that the external shape of the bottle 1 is not impaired, and the good quality of the bottle as a product can be obtained. Appearance appearance can be maintained.

[0020]

Since the present invention has the above-described structure, the following effects can be obtained. A bottom slit located at the lower end of the bottle and an air intake hole at the mouth located at the upper end of the bottle are provided as an outside air entry port between the outer layer and the inner layer. When the inner liquid undergoes volume reduction deformation due to the use of the content liquid poured out, the outer layer and the inner layer are formed by the intrusion of outside air from the slits and the air intake holes into the outer layer according to this deformation and the flow of the outside air. Of the inner layer is smoothly achieved on average as a whole without being partially biased, and the deformation of the inner layer is easily and satisfactorily achieved.

Since the inside and outside layers are maintained at normal pressure due to the intrusion of outside air from the slit and the air intake hole and the circulation of the outside air, even hot water enters between the outer layer and the inner layer through the slit on the bottom surface. Even so, the invading hot water is easily and quickly discharged from this slit and does not stay in the bottle for a long time, so there is no inconvenience caused by the hot water staying in the outer layer of the bottle for a long time. And a good and hygienic use situation can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing a substantially right half of a longitudinal section of an embodiment of the present invention.

FIG. 2 is an overall perspective view of the embodiment shown in FIG.

FIG. 3 is an enlarged longitudinal sectional view showing a die cutting portion before forming a slit in the embodiment shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; Bottle 2; Outer layer 3; Inner layer 4; Mouth 5; Trunk 6; Bottom 7;

Claims (1)

[Claims] 1. An outer layer (2) made of synthetic resin forming a fixed outer shell by blow molding, and an outer layer (2) made of flexible synthetic resin laminated releasably on the outer layer (2) to form an inner bag. An inner layer (3), and between the edges of the outer layer (2) of the die cutting portion (7) formed at the bottom (6) of the lower end, the outer layer (2) and the inner layer
A slit (8) is provided as an inlet for outside air between the outer layer (3) and the outer layer (2) at the upper end (4).
A bottle having an air intake (9) between (2) and the inner layer (3).