Bottles and jars – Multilayer barrier structure
Patent
1996-01-26
1999-07-13
Weaver, Sue A.
Bottles and jars
Multilayer barrier structure
215 122, 215385, 215902, 264156, 264513, 264516, 425525, 425529, 425533, 425534, 425538, B65D 102, B29C 4908, B29C 4918, B29C 4924
Patent
active
059214163
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a double-wall bottle and a method and apparatus for molding such a double-wall bottle.
More specifically, this invention relates to a double-wall bottle consisting of inner and outer bottles, where the inner bottle can be deformed by pressure reduction and a liquid contained therein can be sucked out by pressure reduction.
2. Background Art
A typical conventional vessel containing a syrup or the like has a structure in which the syrup is discharged by a means such as a pump.
A known type of vessel of this sort is called a bag-in-box. A bag-in-box consists of a synthetic resin container capable of holding, for example, five gallons of syrup and positioned within a rectangular corrugated cardboard box. The syrup is sucked out of the synthetic resin container by pressure reduction, while the container is deformed by this pressure reduction.
However, the bag-in-box is said to have problems, as described below. One problem concerns the way in which the bag-in-box is difficult to handle when it is being transported. Another problem concerns the large number of components of the bag-in-box, such as corrugated cardboard, a resin container, resin valves, and metal springs, which are of so many different materials, they are difficult to recycle. Yet another problem is caused by the cardboard box that surrounds the synthetic resin container, making it impossible to check the amount of contents remaining in the container.
A configuration disclosed in U.S. Pat. Nos. 3,945,539, 4,350,272, and 4,921,135 is such that an inner resin container having flexibility is placed within an outer metal container, the inner container is deformed by increasing the pressure in the gap between the inner and outer containers, and thus the contents of the inner container are extracted.
In further configurations that put these techniques to practical use, each of the inner and outer containers is a resin container, the inner container is deformed by either reduced pressure or increased pressure, and thus the contents are extracted from the inner container, as disclosed in U.S. Pat. Nos. 4,966,543, 5,242,085, and 5,242,086 and International Publication Number WO 92/12926.
However, the containers disclosed in the above Publications require a release layer between the inner and outer containers. The presence of such a release layer makes it easy for the inner container to separate from the outer container, and thus enables the inner container to deform.
Further, in the methods of molding each of the containers disclosed in the above Publications, after a three-layer or five layer preform is injection-molded, a multi-layer container is formed by blow-molding from this multi-layer preform. Ordinarily, if two-layer container is molded by blow-molding from a two-layer preform in which the material of both the inner and outer layers is the same, the inner and outer layers stick together and it is not possible for the inner layer to separate from the outer layer. With the techniques disclosed in the above Publications, between the inner layer and the outer layer is provided with a release layer of a different material from that of inner and outer layers, in order to make it easy for the inner layer to separate from the outer layer in a multi-layer container formed from a multi-layer preform by blow-molding.
Further, if the above described multi-layer container is formed of three or more layers, the two or more outer layers in intimate contact with the innermost layer must be formed to have air vent holes that do not pierce this innermost layer, in order to allow at least the innermost layer to deform by reduced pressure. Techniques for forming these holes are disclosed in U.S. Pat. No. 4,966,543 and International Publication Number WO 92/12926, but it is extremely difficult to form holes in only the outer layers, without touching and damaging the very thin innermost layer.
On the other hand, techniques of forming an inner container which can be deformed by pressure reduction without the inne
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Hoffman, Esq. David L.
Nissei ASB Machine Co. Ltd.
Weaver Sue A.
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