Bottles and jars – Multilayer barrier structure – Coating or lamination
Patent
1984-08-23
1986-03-04
Price, William
Bottles and jars
Multilayer barrier structure
Coating or lamination
215 1C, 215100R, 220 69, B65D 2524
Patent
active
045735972
DESCRIPTION:
BRIEF SUMMARY
This invention relates to containers made of thermoplastics resin materials, and is directed to standing bases for such containers. The invention has particular, but not exclusive, application to screw-top bottles for carbonated beverages.
It is well known to make carbonated beverage bottles from thermoplastics polymers, in particular polyethylene terephthalate (PET), by a blow moulding operation performed on an extended tubular parison or an injection moulded preform. Carbonated beverages, e.g. beer, can generated in the bottles internal pressures of several atmospheres in magnitude, and in order to withstand such pressures without eversion or other uncontrolled deformation it has been proposed that the bases of the bottles should be outwardly (i.e. convexly) domed to rounded or generally hemispherical form.
In order to enable the bottles to be stood upright it has further been proposed that either the bottle bases should be modified by the superposition of integral standing feet on the outside of the generally rounded base contour, or the bottles should be fitted with separate standing cups providing annular standing surfaces extending around, and proud of, the bottle bases.
However, each of these expedients has disadvantages. For both expedients the rounded standing bases represent a substantial height (axially of the bottle), so correspondingly reducing the area available for printing or labelling. The provision of integral standing feet requires exacting design and close control of the moulding operation if satisfactory bottles are to be produced at high speed and over long production runs. Furthermore, the standing feet themselves represent a substantial additional requirement for the thermoplastics material, which is likely to be relatively expensive to provide the low gas permeability required for the bottle; moreover, the feet are visible from the side of the bottle and are visually unattractive, and when the bottles are passing at high speed along a filling line they tend to catch in irregularities, joints, etc., of the conveyor so that, in these circumstances at least, the stability which they impart to the bottles is unsatisfactory.
A standing cup may be made from a thermoplastics material which is cheap in relation to that of the bottle proper, but the difference in materials then creates a separation problem if the materials are to be recycled after the bottle has been used. Moreover, the rounded base of the bottle is unsightly, and for visual appeal, maximum stability and/or ease of attachment and location, the cup conventionally has an upturned cylindrical skirt which extends, in generally flush relation to the bottle body, for the whole height of the base. The skirt is therefore extensive in area, and correspondingly has a substantial material requirement; the relative cheapness of the cup material in relation to that of the body therefore does not result in any substantial economies. A further disadvantage of the standing cups now employed is that they tend to give the purchaser of the bottles a greater impression of the quantity of product than in fact exists, so leading to a degree of consumer resistance.
A further base arrangement for a carbonated beverage bottle is disclosed in U.S. Pat. No. 4,108,324. In that Specification there is described a one-piece thermoplastics bottle of which the base is recessed within an annular standing ring. In order to rigidify and stabilise the base against eversion and "rolling-out", hollow, shallow projections are formed at regular intervals around the wall of the recess and extend radially inwardly towards the centre of the base. This base configuration suffers from the same or similar disadvantages as the rounded base configuration of the one-piece bottle described above except that the appearance of the bottle is improved; moreover, the recessed base configuration is inherently less able to withstand carbonation pressures than the rounded base configuration, and despite the rigidifying projections the material thickness of the base may need to be m
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Adams John F. E.
Folland Rickworth
Oakley Nicholas R.
Proffit Philip J. G.
Metal Box p.l.c.
Price William
Weaver Sue A.
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