|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||521/056; 521/058; 521/060; 521/146|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 12 인용 특허 : 10|
Process for processing expandable polymer particles e.g. polystyrene (EPS) that eliminates the maturing step between the pre-expander and molding steps. The expandable particles are first over pressurized with gas, e.g. air, carbon dioxide, nitrogen, and mixtures thereof, at a pressure between 500 and 8000 kPa and a temperature between-20�� C. and 130�� C. for 15 to 7200 minutes to create a gas pressure in the particles. Using the gas pressure in the particles, pre-expanding the particles with a heating medium, e.g. steam at a temperature between 100�� ...
What is claimed is: 1. A process for processing polymer particles which optionally contain a blowing agent, the steps consisting of: a) in a pressurization unit, over-pressurizing said polymer particles with a high pressurized gas to create a high gas pressure inside said particles; b) immediately transferring said particles to a pre-expander and pre-expanding said particles with a heating medium to form pre-expanded particles, and directing a flow of hot dry air onto said pre-expanded particles to dry said pre-expanded particles in the pre-expander whi...