Method of manufacturing laminated flexible tubes
AssigneeCebal
InventorMichel Bosshardt
Life of this patent
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Abstract
A manufacturing process for flexible tube skirts including the steps of providing a multi-layer plastic film, cutting out a strip from the multi-layer plastic film, producing a cylindrical sleeve by rolling-welding the strip, and cutting out the sleeve to the desired length to obtain the tube skirts. The strip is cut out from a multi-layer plastic film which has a symmetrical structure in relation to its median plane, with symmetrical layers having the same thickness and made of the same plastic, having the same chemical composition and the same molar mass.
Claims22
A manufacturing process for plastic tube skirts comprising the steps of:
- a) providing a multi-layer plastic film;
- b) cutting out a strip from said multi-layer plastic film;
- c) producing a cylindrical sleeve by rolling-welding said strip;
- d) cutting out said sleeve to the desired length to obtain said tube skirts;
- wherein the strip is cut out from a multi-layer plastic film which has a symmetrical structure in relation to its median plane, having symmetrical layers with substantially the same thickness and substantially made up of the same plastic material, i.e. consisting of a polymer or a mixture of several polymers in identical proportions, said polymer(s) being produced from monomers with the same chemical composition and substantially the same average molar mass.
A flexible tube skirt, made up by stacking an odd number of layers of plastic wherein the layers which are placed on either side of the central layer and which have the same row, one in the centrifugal radial direction, the other in the centripetal radial direction, have substantially the same thickness and are substantially made from the same plastic, i.e. they consist of a polymer or a mixture of several polymers in identical proportions, said polymer(s) being produced from monomers with the same chemical composition and having substantially the same average molar mass.
Dependencies are inferred from the claim text.