| 摘要 |
PCT No. PCT/US95/13121 Sec. 371 Date Mar. 27, 1997 Sec. 102(e) Date Mar. 27, 1997 PCT Filed Oct. 2, 1995 PCT Pub. No. WO96/10476 PCT Pub. Date Apr. 11, 1996A process for making injection molded articles having a substantially smooth outer surface and a foamed core by injecting a molten thermoplastic into a mold, and, when the outer surface has formed, injecting a gas under pressure into the mold whereby a limited amount of molten material flows back into the injection unit to create a hollow space in the core of the melt, and releasing the gas pressure to allow the core to foam.
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