Ultrasonic bonding of elastic fiber
AssigneeInvista North America S.A R.L.
InventorRonald D. BING-WO
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Abstract
Elastic band products of high durability and quality are disclosed. Also disclosed are methods of producing durable, high quality elastic band products using modified anvil blocks, including shaped anvil blocks, anvil blocks with lateral protuberances and/or anvil blocks with teeth. The disclosed methods result in reduced elastic yarn thread slippage both during production and in the finished elastic band product.
Claims29
A modified anvil block, wherein the modification is selected from the group consisting of an altered shape, inclusion of one or more teeth, inclusion of one or more lateral protuberances and combinations thereof.
An apparatus for forming elastic bands comprising:
- an anvil wheel and a horn wheel positioned to counter rotate so as to define an entry path therebetween;
- the anvil wheel including at least one set of anvil blocks extending from a surface of the anvil wheel so as to accommodate a yarn in a yarn space defined therebetween;
- the yarn space having a dimension which is equal to or less than the diameter of the yarn as measured when the yarn is in a stretched state, so as to maintain the yarn in position in the yarn space while minimizing or reducing yarn slippage as the anvil wheel and the horn wheel counter rotate.
Dependencies are inferred from the claim text.