Welding of thermoplastics through resistance heating
First Claim
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1. The method of welding thermoplastic parts whereby an areal bond is to be made between surface portions of the parts comprising:
- providing a helically coiled resistance wire as heating element in a configuration outlining a flat star pattern;
placing the star in-between the said surface portions of the parts to be welded, while adapting its configuration to the contour of the surface portions, which cover the star completely on both sides and are being placed in juxtaposition, separated by the heating element,applying electric current to the resistance wire, so that relatively large annular areas of the surface portions as juxtaposed fuse upon softening of the thermoplastic adjacent the star-shaped resistance wire; and
forcing said parts against each other, thereby embedding permanently the coiled heating element in between and providing sealed connection as between said parts with anchoring occurring through bonding of thermoplastic material in the interior of the coiled resistance element and around it with the parts proper as forced against each other.
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Abstract
Surfaces of thermoplastic parts are welded by placing a star-shaped heating element in-between the parts. The element is a coiled wire jacketed in plastic which melts during the welding. The resulting bond covers a relatively large area. The method is used for providing a saddle flange to a thermoplastic tube.
25 Citations
8 Claims
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1. The method of welding thermoplastic parts whereby an areal bond is to be made between surface portions of the parts comprising:
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providing a helically coiled resistance wire as heating element in a configuration outlining a flat star pattern; placing the star in-between the said surface portions of the parts to be welded, while adapting its configuration to the contour of the surface portions, which cover the star completely on both sides and are being placed in juxtaposition, separated by the heating element, applying electric current to the resistance wire, so that relatively large annular areas of the surface portions as juxtaposed fuse upon softening of the thermoplastic adjacent the star-shaped resistance wire; and forcing said parts against each other, thereby embedding permanently the coiled heating element in between and providing sealed connection as between said parts with anchoring occurring through bonding of thermoplastic material in the interior of the coiled resistance element and around it with the parts proper as forced against each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification