Multilayer bottle with separable layer

Details Multilayer bottle with separable layer Multilayer bottle with separable layer

1993-05-05

1995-07-25

Shoap, Allan N.

Bottles and jars

Multilayer barrier structure

220410, 220413, B65D 2302

Patent

active

054354528

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a multilayer bottle comprising at least two layers, in particular, to a multilayer bottle having an innermost inner layer separable from an outer layer, and to a method of manufacturing the same.


BACKGROUND ART

There is known a multilayer bottle having at least an outer layer and an inner layer which are adhered entirely throughout an overall circumference to be integrated into one so that the outer layer and the inner layer are not separated from each other.
When a long time has passed after the bottle is filled with a content, for example, oxygen and the like in the content may be volatilized to thereby reduce the pressure in the bottle, even if the bottle is tightly sealed.
There is also known a bottle of the type having a pump attached to a mouth of the bottle, in which the pump is operated to discharge a liquid content contained in the bottle. In this bottle also, the pressure in the bottle is reduced as the liquid content is discharged by the pump.
In such an event, a conventional multilayer bottle is disadvantageous in that an outer layer 2, namely, a bottle body is crushed together with an inner layer 1 to change the external configuration of the bottle, as illustrated in FIG. 12. This results in deterioration of a commercial value.
The change in said configuration is indefinite. In so distorted bottle, the content is liable to remain in an irregular portion formed in the inner layer as a result of the distortion, even if the mouth is positioned downwards. Thus, it is difficult to take out the content quantitatively and efficiently.
It is a technical thema of this invention to prevent any change in the external configuration of a bottle due to a reduction of the pressure in the bottle.


DISCLOSURE OF THE INVENTION

In order to accomplish the above-mentioned thema, this invention is constituted as follows.
In a multilayer bottle comprising at least two layers including an outer layer and an inner layer, the inner layer and the outer layer adjacent to the inner layer are separable from each other at a body of the bottle while the inner layer and the outer layer are adhered to each other at at least a part thereof.
According to this invention, it is essential that the inner layer is separable. In this connection, the number of the layers may be any desired number not less than two. In addition, the separable inner layer itself may comprise a plurality of layers.
The inner layer and the outer layer are adhered to each other at at least one of a mouth, a body, and a bottom of the bottle.
More specifically, mouth and at an area adjacent to an inner bottom of the bottle; mouth and at the area adjacent to the inner bottom of the bottle in an endless circular fashion along the inner circumferential surface thereof; mouth and at a pinch-off work portion formed on the inner bottom of the bottle; mouth at at least a part thereof; mouth through the body to the bottom in a linear fashion or a zonal fashion.
The inner layer and the outer layer may be entirely adhered at the mouth. On the other hand, the inner layer and the outer layer must not be entirely adhered at the body.
By designating adhering positions between the inner layer and the outer layer, a change in the configuration of the inner layer can be preliminarily specified. It is therefore possible also to efficiently extract the content through the mouth.
In view of the manufacture of the bottle, it is preferable that the inner layer and the outer layer are partly adhered to each other both in the mouth and in the body.
On manufacturing the multilayer bottle, a multilayer parison or a multilayer preform is preliminarily produced. Upon production of the parison or the preform, it is necessary to provide an adhesion layer between at least a part of the inner layer and at least a part of the outer layer in a portion to be molded into the mouth after blow molding. When the adhesion layer is formed, it is not easy to provide the adhesion layer at the mouth alone during extrusion of a cylindrical parison or prefo

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