Patent ID: 6403662
Filing Date: 2002-06-11
Classification: B29C,C08J,Y10S

Abstract:
A method utilizing a continuous process for manufacturing polyolefin foam beads comprising the steps of:impregnating a foaming agent into a polyolefin resin by mixing the polyolefin resin particles, water and the foaming agent in a impregnation chamber at the temperature between softening point and melting point of the resin; storing the polyolefin resin particles impregnated with the foaming agent in water dissolved with the foaming agent in a storing chamber at the temperature between softening point and melting point of the resin; and foaming the polyolefin resin by continuously or intermittently discharging the resin particles from the high pressure storing chamber to a low pressure expansion chamber by utilizing a discharging device, in the same time period when the next batch of polyolefin resin is added and mixed in the impregnation chamber.