Low stress to seal ePTFE gasket material
First Claim
1. A multilayer form-in-place gasket comprisingan upper and lower gasket surface, andat least two tapes of porous polytetrafluoroethylene (PTFE) in a stacked configuration,each porous PTFE tape comprisinga top tape surface,a bottom tape surface, and a length,wherein at least one region along the length of each tape is densified through a thickness of the tape forming at least one substantially non-porous region such that the regions of porous PTFE material are separate from each other by the non-porous region, and a substantially air impermeable layer disposed on the top tape surface of at least one of the at least two tapes that forms an interface between the at least two tapes,wherein the substantially non-porous regions of at least two tapes are not aligned in the thickness direction.
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Accused Products
Abstract
A low stress-to-seal gasket material is described. Gaskets made according to the present invention comprise at least two tapes of porous PTFE and a substantially air impermeable layer at the interface of the two tape layers. The tape layers each have a non-porous region extending the tape length and separating two porous regions. The non-porous regions of at least two tape layers are not aligned in the z-axis direction.
22 Citations
31 Claims
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1. A multilayer form-in-place gasket comprising
an upper and lower gasket surface, and at least two tapes of porous polytetrafluoroethylene (PTFE) in a stacked configuration, each porous PTFE tape comprising a top tape surface, a bottom tape surface, and a length, wherein at least one region along the length of each tape is densified through a thickness of the tape forming at least one substantially non-porous region such that the regions of porous PTFE material are separate from each other by the non-porous region, and a substantially air impermeable layer disposed on the top tape surface of at least one of the at least two tapes that forms an interface between the at least two tapes, wherein the substantially non-porous regions of at least two tapes are not aligned in the thickness direction.
Specification