【発明の名称】加圧下で溶解した二酸化炭素によるフォーム作成法およびその装置

Japanese Patent JP3332313

B2

Producing foam from a liq. contg. gas dissolved under pressure, by expanding the liq. to a pressure below the satn. pressure of the gas and releasing the gas. The process comprises forcing the liq. through an extended flow channel so that the pressure is reduced against the flow resistance and a high shear rate is generated, and then reducing the rate of flow to 1/10-1/500 of its original value before the liq. foams. Also claimed is an appts. for this process, comprising a housing (2) contg. a long flow channel (4) with a small cross-section in at least one dimension, a distribution chamber (5) for the pressurised liq. over the opening(s) of the flow channel, a feed pipe (7) for the distribution channel (5) and a means (6) of reducing the speed of the liq. after the outlet end (15) of the flow channel (4). Pref. used esp. for the prodn. of foam from 2-component reactive plastics with CO2 as blowing agent, the process comprises mixing at least one of the components with CO2 under pressure, mixing the components, expending the CO2-contg. mixt. and hardening the foam obtd.. The liq. or reactive mixt. passes through the flow channel in less than 10<->2 secs., and the shear rate produced in the channel is at least 10<->4/sec.. The flow channel is in the form of a conical ring channel with an inner cone which can be moved axially to narrow the channel. The ratio between the length of the flow channel in the direction of flow and its small cross-sectional dimension is 30-300.

Hans-Michael Sulzbatha
Ferdinand Althausen
Herbert Schyutyren
Reiner Ratufuel
Robert Ayben
Willfleet Eberlink

JP35003195A

October 07, 2002

December 25, 1995

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Hennecke GmbH
Bayer Aktiengesellschaft

C08J9/12; B29C44/00; B29C44/34; B29C44/46; B29K75/00; (IPC1-7): B29C44/00

JP7308618A

Aoyama Ryo (2 outside people)

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