JPH0577345A - Laminated bottle - Google Patents

Abstract

PURPOSE:To prevent a change in the appearance shape of a bottle due to the reduced pressure in the bottle. CONSTITUTION:In a laminated bottle consisting of at least two layers, that is, an outside layer 2 and an inside, layer 1, the inside and outside layers 1, 2 are made freely releasable and an adhesive layer 3 is formed to at least a part of the gap between the inside layer 1 and the outside layer 2 adjacent thereto to bond the inside and outside layers 1, 2 and the superposed cross section 6 of the inside and outside layers 1, 2 is exposed to the outside of the bottle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated bottle having at least two layers, and particularly when the content of a volatile component is reduced and the inside of the container is depressurized, the innermost inner layer and the inner layer are adjacent to each other. And an outer layer that freely peels off to prevent changes in the external shape of the bottle.

[0002]

2. Description of the Related Art As a laminated bottle of this type, as shown in FIGS. 8 and 9, at least an outer layer 2 and an inner layer 1 are provided, and the outer layer 2 and the inner layer 1 are entirely covered with an adhesive layer 3. There is known a structure in which the both are integrally bonded to each other so as not to be separated from each other.

[0003]

By the way, after a long time has passed after filling the contents of the bottle, even if the bottle is hermetically sealed, for example, oxygen in the contents is volatilized to reduce the pressure inside the bottle. There are cases.

In such a case, in the conventional laminated bottle,
As shown in FIG. 9, the outer layer 2, that is, the bottle body, contracts together with the inner layer 1 to change the appearance shape of the bottle, which causes a problem that the product value is impaired.

Further, the shape change occurs indefinitely, and thus the deformed bottle has contents on the uneven portion of the inner layer 1 caused by the deformation even when the bottle is turned upside down and the mouth portion is located below. It was easy to remain and it was difficult to quantitatively and efficiently take out the contents.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent a change in the external shape of the bottle due to the pressure reduction in the bottle.

[0007]

In order to solve the above-mentioned problems, the present invention has the following features. That is, in a laminated bottle composed of at least two layers of an outer layer and an inner layer, the inner layer and the outer layer can be separated, and an adhesive layer is formed on at least a part between the inner layer and an outer layer adjacent to the inner layer. Then, the inner layer and the outer layer were adhered to each other, and a laminated bottle was obtained in which a polymerization cross section of the inner layer and the outer layer was exposed to the outside of the bottle.

The laminated bottle may be manufactured by, for example, an extrusion blow molding method, and the polymerized cross section of the inner layer and the outer layer may be exposed to the outside of the bottle at the pinch-off processing portion at the bottom of the bottle.

In the present invention, the inner layer and the outer layer may be separated from each other, and any number of layers may be used as long as they are two or more layers. The inner layer to be peeled off may itself be a multi-layer. Further, the inner layer and the outer layer are adhered to each other at least in part by an adhesive layer. For example, an adhesive layer can be provided at the mouth between the inner and outer layers. In this case, the inner layer and the outer layer may be entirely adhered to each other in the mouth portion, but the inner layer and the outer layer may not be entirely adhered to each other in the body portion. However, the inner layer and the outer layer may partially adhere to each other as long as the peeling of the inner layer from the body portion is not hindered.

Therefore, the inner layer and the outer layer may be adhered to each other in the mouth portion and the vicinity of the inner bottom of the bottle, or in the mouth portion and the vicinity of the inner bottom of the bottle, their inner peripheral surfaces may be adhered endlessly. Further, these can be adhered to each other at the pinch-off processing portion of the mouth portion and the bottom portion of the bottle.

By devising the position of the adhesive portion in this way, the changed shape of the inner layer can be specified in advance, and the contents can be efficiently extracted from the mouth portion. Examples of the contents in which the volatile component is released to reduce the volume and the pressure inside the bottle may be reduced include pesticides, cosmetics, shampoos, etc., and the laminated bottle of the present invention accommodates such substances. It is suitable for

[0012]

In the laminated bottle according to the present invention, after filling the contents,
When a long time has passed and the volume of the contents is reduced and the pressure in the bottle is reduced even in a sealed state, air is sucked in between the inner layer and the outer layer exposed to the outside due to the cross-section of these layers. The inner layer is easily separated from the outer layer. As a result, only the inner layer is easily shrunk and deformed, and no change is observed in the external shape of the bottle. In this case, even if the adhesive layer is formed between the inner layer and the outer layer, the air is inhalable because the inner layer and the outer layer are not completely sealed.

Further, when the inner layer is deformed, the inner layer and the outer layer are preliminarily adhered to each other at a predetermined portion so that the changed shape can be specified, and even when the inner layer is deformed, the contents can be changed. It is possible to realize efficient take-out of objects.

[0014]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention, which is a two-layer laminated bottle consisting of an inner layer 1 and an outer layer 2. The inner layer 1 and the outer layer 2 are formed by an adhesive layer 3 provided on a mouth portion 4. Adhered to each other. The outer layer 2 is made of polyethylene, and the inner layer 1
Is made of nylon, and the adhesive layer 3 is made of Admer (trade name).

A pinch-off processing portion 7 is provided on the bottom 5 of the bottle.
In the pinch-off processing portion 7, the inner layer 1 is integrated from both sides to close the inside of the bottle, and the outer side of the inner layer 1 becomes the outer layer 2, and the cross-section of the inner layer 1 and the outer layer 2 is overlapped. 6 projects downward and is in contact with the outside air.

The bottle of this embodiment is manufactured as follows. First, a tubular laminated parison in which the outer layer 2, the adhesive layer 3, and the outer layer 2 are laminated is molded by extrusion molding. That is, the extruded laminated parison is set in a blow molding die and molded by the blow molding method.

In this case, the laminated parison is extruded, and the laminated parison is closed from both sides by a mold and air is blown into the molded product, and the laminated parison is cut at the cutting portion of the mold in the process of closing the mold. Then, when the portion cut off by the cutting portion is further cut, a pinch-off processing portion 7 is formed on the bottle bottom portion 5 in which the overlapped cross section of the inner layer 1 and the outer layer 2 is exposed to the outside. A shaped bottle is obtained.

This bottle is suitable for accommodating a liquid of a type in which the substance in the contents is easily vaporized even if the inside of the bottle is sealed. After a long time has passed after filling the contents, if the contents such as oxygen evaporate, the inside of the bottle is depressurized.

At that time, outside air enters the peeling portion from the exposed cross section of the inner layer 1 and the outer layer 2, the inner layer 1 is easily peeled from the outer layer 2, and only the inner layer 1 is contracted and deformed. The shape of the outer layer 2, that is, the bottle body is not affected at all.

In this embodiment, the outer layer 2 is polyethylene (trade name: Calpe) containing calcium carbonate,
The inner layer 1 was made of nylon. As a result of having such a configuration, good peelability was obtained.

[0021]

[Embodiment 2] In this embodiment, as shown in FIGS.
On the outer peripheral surface of the inner layer 1, that is, a part of the inner peripheral surface of the outer layer 2, the adhesive layer 3 is formed into a strip-shaped bottle mouth portion 4 in a vertical direction.
It is also possible to provide from the to the bottle bottom part 5. As a result, the outer layer 2 and the inner layer 1 are partially bonded at the adhesive layer 3. That is, the outer layer 2 and the inner layer 1 are in a peelable state except for the adhesive layer 3.

[0022]

Third Embodiment FIG. 6 shows another embodiment. In this embodiment, the adhesive layer 3 is formed on the shoulder and the inner bottom of the bottle.

Thus, in this embodiment, when the pressure inside the bottle is reduced, the center of the body of the inner layer 1 is deformed into a concave shape. Therefore, it is possible to prevent the inner layer 1 from being deformed in an irregular shape,
The deformed shape can be specified.

By controlling the deformation with a specific shape in this manner, the contents can be taken out efficiently from the mouth portion 4 upside down.

[0025]

Fourth Embodiment FIG. 7 shows still another embodiment.
In this embodiment, the adhesive layer 3 is formed in an endless ring shape on the inner peripheral surface of the mouth portion 4 and the vicinity of the inner bottom of the bottle.

Therefore, when the inside of the bottle is depressurized, the center of the body of the inner layer 1 is deformed into a concave shape over the entire circumference. Therefore, in the present embodiment, it is possible to more efficiently take out the contained items.

In each of the drawings shown in the above embodiments, only the bottle shape is shown, but the mouth 4 of the bottle may be closed with a synthetic resin cap, or the liquid material to be contained is extracted. A pump mechanism may be provided for this purpose. When the pump mechanism is provided, the internal pressure of the bottle suddenly becomes a negative pressure state due to the pump operation, so that there is a particular concern about the deformation of the appearance of the bottle.
Only the shape is deformed, so it does not affect the appearance.

[0028]

According to the present invention, in a laminated bottle,
Even after a long time has passed after filling the contents, there is no change in the external shape of the bottle due to the reduced pressure in the bottle, and the productability is not impaired. That is, whatever the shape of the bottle body, the appearance of the bottle will not be deformed due to the reduced pressure inside the bottle, so that the productability is improved.

At the same time as the pinch-off processing, this portion becomes an adhesive portion, so that the manufacturing process becomes efficient.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic structure of a laminated bottle of Example 1 of the present invention.

FIG. 2 is an enlarged cross-sectional view of a pinch-off processed portion of the laminated bottle in Example 1.

FIG. 3 is a cross-sectional view showing a deformed inner layer of the laminated bottle in Example 1.

FIG. 4 is a perspective view showing a schematic structure of a laminated bottle in Example 2.

FIG. 5 is a sectional view showing a sectional structure of a body portion of a laminated bottle in Example 2.

FIG. 6 is a view showing a structure of a laminated bottle in Example 3.

FIG. 7 is a view showing the structure of a laminated pesticide bottle in Example 4.

FIG. 8 is a cross-sectional view showing a structure of a laminated bottle according to a conventional technique.

FIG. 9 is a view showing a deformed state of a laminated bottle in the conventional technique.

[Explanation of symbols]

 1 ・ ・ Inner layer 2 ・ ・ Outer layer 3 ・ ・ Adhesive layer 4 ・ ・ Mouth part 5 ・ ・ Bottle bottom part 6 ・ ・ Polymerized cross section of inner layer and outer layer 7 ・ ・ Pinch off processing part

Claims (5)

[Claims] 1. A laminated bottle comprising at least two layers, an outer layer and an inner layer, wherein the inner layer and the outer layer are made peelable and adhered to at least a part between the inner layer and an outer layer adjacent thereto. A laminated bottle characterized in that a layer is formed and the inner layer and the outer layer are adhered to each other, and a cross section of the polymerization of the inner layer and the outer layer is exposed to the outside of the bottle. 2. The polymerized cross section of the inner layer and the outer layer comprises:
The laminated bottle according to claim 1, which is exposed to the outside of the bottle at a pinch-off processing portion at the bottom of the bottle. 3. The laminated bottle according to claim 1, wherein the inner layer and the outer layer are bonded to each other at a mouth portion and a portion near the inner bottom of the bottle. 4. The laminated bottle according to claim 1, wherein the inner layer and the outer layer have their inner peripheral surfaces adhered in an endless ring shape at the mouth portion and a portion near the inner bottom of the bottle. 5. The laminated bottle according to claim 1, wherein the inner layer and the outer layer are adhered to each other at a pinch-off processed portion of the mouth portion and the bottle bottom portion.