Manufacture of polyolefin resin expanded beads

Abstract

Abstract PURPOSE:To obtain titled beads capable of giving highly-expanded products, by dispersing polyolefin resin beads in water within a closed vessel, adding volatile expanding agent, heating to specific temperature followed by sealing in the vessel a pressurized inorganic gas, then discharging the content into a lower-pressure atmosphere. CONSTITUTION:Polyolefin resin beads 2 are fed to a closed vessel 1, being dispersed in water 3, followed by charging the vessel 1 with a volatile expanding agent 6 and heating the resultant dispersion to a temperature higher than the softening point but lower than the melting point of said beads. Next, for maintaining the pressure in the vessel >=5kg/cm<2>G at the discharge of the final portion 7 of said dispersion 3 containing the resultant beads 2, a pressurized inorganic gas 9 is sealed in the vessel prior to the discharge of the dispersion 3 followed by opening the delivery exit 7 provided under the water surface within the vessel, discharging said dispersion 3 into the atmosphere with a pressure lower than that in the vessel, thus obtaining the objective beads.

Inventors

• 👤 Hiroshi Endo
• 👤 遠藤　紘
• 👤 Hiroshi Matsui
• 👤 松居　宏
• 👤 Takanori Suzuki
• 👤 鈴木　高徳

Bibliographic Details