Receptacles – High-pressure-gas tank – Multilayer container
Patent
1999-05-24
2000-11-14
Castellano, Stephen
Receptacles
High-pressure-gas tank
Multilayer container
220588, 220592, 220565, B65D 9002
Patent
active
061456934
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a glassfibre-reinforced plastic container for e.g. liquefied petroleum gas or compressed air, a method for manufacturing a reinforcement body therefor and an apparatus for manufacturing reinforced bodies of the type mentioned in the preamble to the following independent claims. Reinforcing strands other than glassfibre strands can also be used.
Swedish patent 9101584-2 describes a glassfibre-reinforced container of the type in question in which the conical joint between the two container halves has a special arrangement of glassfibre reinforcement so that the container will be able to withstand relatively high pressures, up to about 100 bar.
Both container halves in the known tank have outer, inner and intermediate reinforcement layers in which are included densely laid glassfibre strands which as flat-lying bundles of strands form groups of glassfibre strands arranged with intermediate channels, which reinforcing layers are wound according to a mutually predetermined pattern before casting of the container and form a separate reinforcing body which is placed into the mould. These glassfibre strands have, before manufacturing of the reinforcing body, been included in strips of glassfibre bundles, so-called "rovings".
Swedish patent 9101584-2 further describes a method for manufacturing of the reinforcing bodies included in the container halves and a simple device for performing the method.
Each construction has some part which determines the dimensions for the whole construction. In the known container halves it is the joint and the base part with its transition, called shoulder from now on, between the cylindrical surface of the container half and its base. It is therefore desirable to ensure a sufficiently high strength in the base and the shoulder as well as in the cylindrical part without needing for this reason to overdimension any part.
U.S. Pat. No. 3,112,234, for example, suggests, as shown in FIGS. 8-10, that for pressure tanks for airbrakes it can be appropriate to introduce a reinforcing patch in the winding over the shoulder of the container, in order to increase the strength during fastening of e.g. pipe couplings to brake lines. Because only the longitudinal reinforcing strands run over the base of the container half including its shoulder part, through the transverse strands only being able to be wound onto the cylindrical part of the container half, the base and shoulder parts lack strands running in the circumferential direction and therefore do not have as high a strength as the rest of the container.
The object of the present invention is therefore, in a simple and cost-saving way, to provide a container which has a more even distribution of reinforcing layers and which, in each part of the container half has in general reinforcement adapted to the actual strength requirements, and in the shoulder part and a concentric annular part of the gable end in particular, which gives the container an increased impact resistance and permits making holes with sufficiently high remaining strength in the last mentioned part.
This is achieved according to the invention through a reinforced plastic container of the type stated in the introduction which has the features stated in the following independent claims, which involves a new combination of axial winding and tangential winding with a diagonal winding in such a way that the whole of the reinforcing body is further reinforced and an even, similar strength is obtained in the whole of the base part. In this way an optimization of the reinforcement at a finer level than that which is possible with conventional technique, is obtained. Advantageous developments and improvements of the invention are possible through the features stated in the dependent claims.
Suitable embodiments of the container according to the invention are shown as examples on the following schematic drawings and explained more closely in the following description. Furthermore, the method for producing a container half and a reinforcing body accordi
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Filament Winding: its development, manufacture, applications and design; D.V. Rosato and C.S. Grove, Jr.; pp. 216-231, 190-191, 270-271 from Polymer Engineering and Technology.
Castellano Stephen
Composite Scandinavia AB
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