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US 11,549,631 B2Granted
Asymmetrical stretch composite for pipe liner
AssigneeLydall, Inc.
InventorsJin Young Choi, John Lewis
Life of this patent
Estimating the term…
Abstract
A fibrous material or composite including a plurality of layers joined to one another, for example, by needlepunching, is disclosed. The fibrous composite generally has an asymmetrical stretch profile, such that the fibrous composite is more extensible in the cross-machine direction than in the machine direction. The fibrous composite may find particular use in forming a cure-in-place pipe liner.
Claims18
A fibrous composite comprising:
- a first layer comprising a plurality of staple fibers, the first layer having a first dimension extending in a first direction and a second dimension extending in a second direction, the first direction and the second direction being substantially perpendicular to one another;
- and
- a second layer comprising a plurality of filament yarns oriented in the first direction and disposed along the second dimension of the first layer, wherein
- the plurality of filament yarns of the second layer and the plurality of staple fibers of the first layer are mechanically entangled with each other,
- the plurality of filament yarns do not form a unitary second layer;
- and
- the fibrous composite has a greater degree of extensibility in the second direction than in the first direction;
- and
- a third layer comprising a plurality of staple fibers, wherein the plurality of staple fibers of the third layer are mechanically entangled with the plurality of filament yarns of the second layer and the plurality of staple fibers of the first layer.
6 more elements
A fibrous composite comprising:
- a first layer comprising a plurality of staple fibers, the first layer having a first dimension extending in a first direction and a second dimension extending in a second direction, the first direction and the second direction being substantially perpendicular to one another;
- a second layer comprising a first plurality of filament yarns oriented in the first direction and disposed along the second dimension of the first layer, and a second plurality of filament yarns oriented in the second direction and disposed along the first dimension of the first layer;
- and
- a third layer comprising a plurality of staple fibers, wherein
- the second layer is disposed between the first layer and the third layer;
- the plurality of staple fibers of the first layer are mechanically entangled with the first plurality of filament yarns and the second plurality of filament yarns, and
- the fibrous composite has a greater degree of extensibility in the second direction than in the first direction;
- the plurality of staple fibers of the third layer are mechanically entangled with the first plurality of filament yarns of the second layer and the plurality of staple fibers of the first layer;
- the fibrous composite has an elongation in the first direction of from about 0.5% to about 5% at a load of 10 lb-f/2-in. strip, and
- an elongation in the second direction of at least about 5% at a load of 10 lb-f/2-in. strip, wherein a ratio of the elongation in the second direction to the elongation in the first direction is at least about 6 to 1.
7 more elements
A fibrous composite comprising:
- a first layer comprising a plurality of staple fibers, the first layer having a first dimension extending in a first direction and a second dimension extending in a second direction, the first direction and the second direction being substantially perpendicular to one another;
- and
- a second layer comprising a first plurality of yarns oriented in the first direction and disposed along the second dimension of the first layer, and a second plurality of yarns oriented in the second direction and disposed along the first dimension of the first layer, wherein
- the yarns oriented in the first direction comprise plain filament yarns or spun yarns,
- the yarns oriented in the second direction comprise elastic yarns,
- the plurality of staple fibers of the first layer are mechanically entangled with
- the first plurality of yarns and the second plurality of yarns,
- the fibrous composite has a greater degree of extensibility in the second direction than in the first direction,
- the fibrous composite has
- an elongation in the first direction of from about 0.5% to about 5% at a load of 10 lb-f/2-in. strip, and
- an elongation in the second direction of at least about 5% at a load of 10 lb-f/2-in. strip, wherein a ratio of the elongation in the second direction to the elongation in the first direction is at least about 6 to 1.
8 more elements
Dependencies are inferred from the claim text.