Dynamic seal to enable movement of a film or fiber through a pressurized space while maintaining a desired pressure

Patent metadata

Field	Value
Publication number	US-9937475-B2
Application number	US-201414779935-A
Country	US
Kind code	B2
Filing date	Mar 26, 2014
Priority date	Mar 27, 2013
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

The present disclosure describes devices capable of continually and controllably passing a polymer film or fiber through a pressurized vessel, while maintaining a desired pressure inside the vessel. In certain embodiments, the devices of the present disclosure include dynamic seals capable of limiting the gas flow from the pressurized vessel to lower pressure environments.

First claim

The invention claimed is:

1. A seal, comprising:
a first structural member;
a second structural member, wherein a first surface of the first structural member faces a second surface of the second structural member;
a first seal material is juxtaposed on the first surface;
a second seal material is juxtaposed on the second surface, wherein the first and second structural members are configured to be compressed toward one another to compress the first and second seal materials toward one another;
a vessel connected to the seal, wherein the vessel contains a liquid under pressure, wherein the liquid exerts pressure between the surfaces of the first and second seal materials; and
a film or sheet between the first and second seal materials, a first liquid layer between the first seal material and the film or sheet, and a second liquid layer between the second seal material and the film or sheet, wherein the vessel supplies the liquid between the first and the second seal materials and the film or sheet.

2. The seal of claim 1 , wherein the first and second structural members are parallel.

3. The seal of claim 1 , wherein the first and second seal materials are non-permeable polymeric materials.

4. The seal of claim 1 wherein the first and second seal materials are permeable polymeric materials.

5. The seal of claim 1 , wherein the first and second seal materials include alternating layers of permeable and non-permeable polymeric materials aligned axially.

6. The seal of claim 1 , wherein the first and second seal materials include channels on surfaces that face one another.

7. The seal of claim 1 , wherein the first and second seal materials define an aperture into the vessel.

8. The seal of claim 1 , wherein a cavity is provided adjacent to each of the first and second seal materials, and each cavity is filled with pressurized liquid that applies a constant pressure along one side of each of the seal materials.

9. A seal, comprising:
a structural member having a wedge-shaped chamber, wherein the chamber has a larger diameter that tapers toward a smaller diameter and tapered sides connecting the larger diameter of the chamber to the smaller diameter of the chamber;
a seal material within the chamber that assumes the shape of the wedge-shaped chamber, wherein the seal material includes a hole axially traversing the seal material, and the hole in the seal material is aligned with an opening in the chamber passing through the small diameter of the chamber; and
a vessel connected to the seal, wherein the vessel contains a liquid under pressure, wherein the liquid exerts pressure on a side of the seal material that is opposite from the tapered sides of the chamber, and the liquid pressure compresses the seal material in the wedge-shaped chamber to constrict the hole in the seal material.

10. The seal of claim 9 , further comprising a cavity provided between the structural member and the seal material, wherein the cavity is filled with pressurized liquid that applies a constant pressure along one side of the seal material.

Assignees

• Univ Washington Through Its Center For Commercialization

Inventors

• Kumar Vipin
• Nicolae Andrei

Classifications

• B01J3/02 Primary

  Feed or outlet devices therefor · CPC title

• B29C44/3453 Primary

  Feeding the blowing agent to solid plastic material · CPC title

• F16J15/16

  between relatively-moving surfaces (F16J15/50, F16J15/52 take precedence; bellows pistons F16J3/06; piston-rings or ring sealings of similar construction F16J9/00) · CPC title