Robert H Walat

US Patent:

6884377, Apr 26, 2005

Filed:

Jul 27, 2000

Appl. No.:

09/626808

Inventors:

Theodore A. Burnham - Winchester MA, US
Sung W. Cha - Roxbury MA, US
Robert H. Walat - Boston MA, US
Roland Y. Kim - Somerville MA, US
Jere R. Anderson - Newburyport MA, US
James F. Stevenson - Morristown NJ, US
Nam P. Suh - Sudbury MA, US
Matthew Pallaver - Lexington MA, US

Assignee:

Trexel, Inc. - Woburn MA

International Classification:

B29C044/20

US Classification:

264 50, 264 51, 264 53

Abstract:

Continuous polymeric extrusion nucleation systems and methods useful for making polymeric microcellular foamed materials, including crystalline and semi-crystalline polymeric microcellular materials, are provided. Pressure drop rate is an important feature in some embodiments, and the invention provides systems for controlling these and other parameters. One aspect involves a multiple-pathway nucleator that is separated from a shaping die by a residence chamber. Another aspect involves a die for making advantageously thick articles, including a multiple-pathway nucleation section. Microcellular material can be continuously extruded onto wire, resulting in a very thin, essentially closed-cell microcellular insulating coating secured to a wire. Other very thin microcellular products can be fabricated as well.

US Patent:

20050256215, Nov 17, 2005

Filed:

Apr 25, 2005

Appl. No.:

11/114249

Inventors:

Theodore Burnham - Winchester MA, US
Sung Cha - Juyup-Dong, KR
Robert Walat - Boston MA, US
Roland Kim - Somerville MA, US
Jere Anderson - Newburyport MA, US
James Stevenson - Morristown NJ, US
Nam Suh - Sudbury MA, US
Matthew Pallaver - Lexington MA, US

Assignee:

Trexel, Inc. - Woburn MA

International Classification:

C08J009/00

US Classification:

521079000

Abstract:

Continuous polymeric extrusion nucleation systems and methods useful for making polymeric microcellular foamed materials, including crystalline and semi-crystalline polymeric microcellular materials, are provided. Pressure drop rate is an important feature in some embodiments, and the invention provides systems for controlling these and other parameters. One aspect involves a multiple-pathway nucleator that is separated from a shaping die by a residence chamber. Another aspect involves a die for making advantageously thick articles, including a multiple-pathway nucleation section. Microcellular material can be continuously extruded onto wire, resulting in a very thin, essentially closed-cell microcellular insulating coating secured to a wire. Other very thin microcellular products can be fabricated as well.

US Patent:

62848100, Sep 4, 2001

Filed:

Feb 26, 1999

Appl. No.:

9/258625

Inventors:

Theodore A. Burnham - Belmont MA
Sung W. Cha - W. Roxbury MA
Robert H. Walat - Boston MA
Roland Y. Kim - Somerville MA
Jere R. Anderson - Newburyport MA
James F. Stevenson - Morristown NJ
Nam P. Suh - Sudbury MA
Matthew Pallaver - Lexington MA

Assignee:

Trexel, Inc. - Woburn MA

International Classification:

B29D 700

US Classification:

521 79

Abstract:

Continuous polymeric extrusion nucleation systems and methods useful for making polymeric microcellular foamed materials, including crystalline and semi-crystalline polymeric microcellular materials, are provided. Pressure drop rate is an important feature in some embodiments, and the invention provides systems for controlling these and other parameters. One aspect involves a multiple-pathway nucleator that is separated from a shaping die by a residence chamber. Another aspect involves a die for making advantageously thick articles, including a multiple-pathway nucleation section. Microcellular material can be continuously extruded onto wire, resulting in a very thin, essentially closed-cell microcellular insulating coating secured to a wire. Other very thin microcellular products can be fabricated as well.