Clifford N Jones

US Patent:

58236694, Oct 20, 1998

Filed:

Apr 12, 1995

Appl. No.:

8/421128

Inventors:

Clifford Jones - Lawrenceville GA

Assignee:

Lolco Packaging Corp. - Studio City CA

International Classification:

B01F 1504

US Classification:

366132

Abstract:

An apparatus and method for continuously and accurately blending a plurality of diverse, normally gaseous or volatile liquid components, preferably two or three, at low pressures. In a preferred embodiment, and apparatus blends a first stream of volatile liquid component, preferably carbon dioxide with a liquid stream of any suitable hydrocarbon (including halogenated hydrocarbons) blowing agent in accordance with any predetermined ratio desired by those skilled in the art before introducing the blend into a suitable extrusion process for preparation of polymeric foams and the like. The apparatus combines the liquid components at a pressure substantially higher than the elevated pressure required during the extrusion process. In an alternative embodiment, the blending apparatus blends a liquid stream of volatile liquid component, preferably carbon dioxide with a liquid stream of a first hydrocarbon blowing agent in accordance with any predetermined ratio and subsequently blends a second hydrocarbon blowing agent with the blend of the liquid carbon dioxide and the first hydrocarbon blowing agent.

US Patent:

54236070, Jun 13, 1995

Filed:

Jan 27, 1994

Appl. No.:

8/188344

Inventors:

Clifford Jones - Lawrenceville GA
John L. Baker - Wenatchee WA

Assignee:

Dolco Packaging Corp. - Lawrenceville GA

International Classification:

B01F 1504

US Classification:

366132

Abstract:

A blending apparatus for continuously and accurately blending a plurality of diverse, normally gaseous or volatile liquid components, preferably two or three, at low pressures. In a preferred embodiment, the apparatus blends a first stream of volatile liquid component, preferably carbon dioxide with a liquid stream of any suitable hydrocarbon (including halogenated hydrocarbons) blowing agent in accordance with any predetermined ratio desired by those skilled in the art before introducing the blend into a suitable extrusion process for preparation of polymeric foams and the like. The apparatus combines the liquid components at a pressure substantially lower than the elevated pressure required during the extrusion process. In an alternative embodiment, the blending apparatus blends a liquid stream of volatile liquid component, preferably carbon dioxide with a liquid stream of a first hydrocarbon blowing agent in accordance with any predetermined ratio and subsequently blends a second hydrocarbon blowing agent with the blend of the liquid carbon dioxide and the first hydrocarbon blowing agent.