Bottles and jars – Ejecting – Siphon type
Patent
1991-07-08
1993-09-07
Weaver, Sue A.
Bottles and jars
Ejecting
Siphon type
215 6, B65D 104, B65D 2300, B29C 4900, B29C 4912
Patent
active
052420663
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to plastics bottles and similar containers and particularly those intended to contain their contents under pressure. Traditionally returnable glass bottles have been used to contain pressurised beverages and other liquids. It is common for such returnable glass bottles to make up a proportion as high as 90% of the total load to be transported. By using non-returnable glass bottles the weight of the bottles can be reduced to about 55% of the total load but by using modern plastics materials such as blow moulded PET it is possible to reduce the weight of the containers to a level as low as about 11% of the total load. This leads to considerable reductions in transport and distribution costs.
Large bottles even when not containing carbonated, or other pressurised beverages must still have side walls of considerable strength to contain the weight of their contents. When bottles and similar containers have to resist pressurised contents such as carbonated beverages they have to withstand considerable internal pressures. As an example of this a beer containing 2.5 volumes of carbon dioxide exerts a pressure on the side wall of the container of approximately 11/2 bar at for example 60.degree. F. (16.degree. C.) and this can increase to a pressure as high as 3 bar at 90.degree. F. (32.degree. C.). The ideal shape of a container to resist such internal pressures is for them to be substantially spherical. However, this shape is not preferred for packaging purposes and so, conventionally, the shape is rationalised by the bottles or similar containers having a generally cylindrical shape with domed ends. By forming plastics bottles or similar containers in this way they are shaped to resist the load exerted by the contents whether this results from the mere weight of the contents or whether this results from the pressurised nature of the contents.
Blow moulded plastics bottles are also known which include an internal division which divides the bottle into separate compartments. Examples of such bottles are described in U.S. Pat. No. A-4,070,140, U.S. Pat. No. -4,217,328 and FR-A-1,258,792.
FR-A-1,258,792 describes a blow moulded plastics bottle having a neck formed to receive a bottle closure, a side wall and a base, and including an internal spider attached to the side wall and extending across the inside of the bottle.
SUMMARY OF THE INVENTION
According to this invention such a bottle or similar container is characterised in that the material in the side wall and spider, at least, of the bottle or other container is bi-axially oriented so that the spider resists tension and acts as an internal reinforcing structure.
The plastics bottle or similar container is preferably formed by initially injection moulding a preform and then blowing the injection moulded preform into a mould cavity thereby bi-axially orienting the side wall and spider, at least, of the bottle.
Usually the bottle or similar container is formed by a stretch-blow moulding technique in which the injection moulded preform is first stretched axially into substantially its final axial length before being blown to its final transverse dimension. This axial stretching may take place by the top of the axial preform which is to form the neck of the bottle being held in a mould and, at the same time, the base of the preform being pushed away from the neck by more than one push rod which enters the preform through the neck and engages its base to push it away from the neck to stretch axially the preform. There may be half as many push rods as there are compartments formed within the bottle by the spider but preferably there are an equal number of push rods and divided compartments inside the bottle. Thus, where the spider is cruciform in cross section four separate push rods are preferably included which engage the base of the preform in each compartment.
Another way of axially stretching the preform is, whilst the neck of the preform is being held in a mould, to engage the outside of the base of the prefo
REFERENCES:
patent: 2661871 (1953-12-01), Huenergardt
patent: 2753990 (1956-07-01), Chalfin et al.
patent: 2951264 (1960-09-01), Bailey
patent: 3474927 (1969-10-01), Bowles
patent: 3743467 (1973-07-01), Lopez
patent: 4026984 (1977-05-01), Seefluth
patent: 4065536 (1977-12-01), Lucas
patent: 4101041 (1978-07-01), Mauro, Jr. et al.
patent: 4217328 (1980-08-01), Cambio, Jr.
patent: 4261948 (1981-04-01), Krishnakumar et al.
patent: 4277000 (1981-07-01), Jarsha
patent: 4279349 (1981-07-01), Aigner
Weaver Sue A.
Whitbread & Company plc
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