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US 4,781,048 AGranted
Method of forming spirally wound gaskets
AssigneeFlexitallic Limited
InventorLeslie Richardson
Life of this patent
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Abstract
A spiral wound gasket is made by progressively winding strip material between co-operating rollers to form a gasket section, the method of manufacture including the step of separating the rollers at a predetermined rate to give a predetermined rate of growth for the gasket section formed between them.
Claims3
A method of producing a spiral wound gasket formed by a plurality of superposed turns of strip material, said method comprising:
- (a) progressively winding a metal strip between a pair of cooperating rollers;
- (b) after winding at least one complete turn of said metal strip, introducing a strip of gasket filler material into the winding ahead of said pair of rollers to form superposed layers of said metal strip and said gasket filler material, wherein a discontinuity is formed in said winding when said gasket material is introduced;
- and, while continuing to wind said superposed layers of said metal strip and gasket filler material,
- (c) positively separating said rollers at a predetermined rate to give a predetermined substantially constant rate of growth in diameter for a composite gasket section formed between said rollers, said rate being substantially without regard to any local variation in thickness of said layers.
1 more element
Dependencies are inferred from the claim text.