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US 2025/0154700 A1Published application
Porous non-woven ptfe compositions and methods of forming
AssigneeDonaldson Company, Inc.
InventorsShane Lawson, Elena T. Ewaldz, Andrew J. Reuter, Yehya A. Elsayed
Life of this patent
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Abstract
Tapes, expanded tapes, and methods of making the same. The tapes and expanded tapes include long-strand PTFE fibrils, short-strand PTFE fibrils, and an oriented network. The oriented network includes nodes. The nodes include short-strand PTPE fibrils. Tapes may include a plurality of through pores. Expanded tapes may include a plurality of through pores.
Claims20
A tape comprising:
- a machined matrix having a machined direction, the machined matrix comprising:
- long-strand PTFE fibrils forming an oriented network comprising the long-strand PTFE fibrils, the long-strand PTFE fibrils defining a longitudinal direction;
- nodes distributed among the oriented network, the nodes comprising active particles and short-strand PTFE distributed among the active particles;
- and
- a plurality of through pores having an average pore opening of 50 micrometers or greater.
2 more elements
An expanded tape comprising:
- an expanded matrix having an expanded direction, the expanded matrix comprising:
- long-strand PTFE fibrils forming an oriented network comprising the long-strand PTFE fibrils, the long-strand PTFE fibrils defining a longitudinal direction;
- and
- nodes distributed among the oriented network, the nodes comprising active particles and short-strand PTFE distributed among the active particles;
- and
- a plurality of through pores having an average size of 50 micrometers or greater.
3 more elements
A method of making an expanded tape, the method comprising:
- machining a fibrous matrix in a machined direction to form a machined matrix, the fibrous matrix comprising:
- short-strand PTFE fibrils;
- long-strand PTFE fibrils;
- and
- active particles;
- expanding the machined matrix in the expanded direction to form an expanded matrix;
- and
- forming a plurality of pores to form the expanded tape.
5 more elements
Dependencies are inferred from the claim text.