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US 4,377,429 AGranted
Welding of plastics material
AssigneeGundle Holdings (Proprietary) Limited
InventorFriedrich Struve
Life of this patent
Estimating the term…
Abstract
Welding surfaces of thermoplastics material together by depositing a continuous layer of molten thermoplastic welding material over adjacent areas of the surfaces to be joined, the deposition of at least part of the molten welding material being effected with a smearing action in which the material is subjected to shear forces acting across the surfaces, and allowing the deposited material to solidify.
Claims15
A method of welding together surfaces of thermoplastic material comprising:
- (a) depositing a continuous layer of molten thermoplastic welding material over adjacent areas of the surfaces to be welded together;
- (b) substantially simultaneously with the deposition of the welding material, circularly smearing a boundary layer of the welding material which is in contact with the surfaces to be welded onto the adjacent areas of the surfaces so that the welding material being smeared is subjected to shear forces transverse to the direction of deposition of the layer of welding material;
- and
- (c) allowing the layer of deposited thermoplastic welding material to solidify.
1 more element
An apparatus for the continuous welding together of surfaces of thermoplastic material, comprising:
- means for depositing a continuous layer of molten thermoplastic welding material onto adjacent areas of the surfaces;
- and, smearing means for circularly smearing a boundary layer of the welding material which is in contact with the surfaces to be welded onto the adjacent areas of the surfaces during the deposition of the welding material, so that the welding material being smeared is subjected to shear forces transverse to the direction of deposition of the layer of welding material.
Dependencies are inferred from the claim text.