| 摘要 |
Void-free slabs or billets of thermoplastic polymer are produced by cooling polymer melt in a mold under pressure while keeping part of the melt in contact with a heat-insulating deformable surface of the mold cavity. Apparatus of this invention comprises a mold having two parallel rigid planar surfaces, a deformable heat-insulating ring placed between said planar surfaces, stiffening or backing means to maintain the shape of the outer wall of the ring, and pressure means for controllable changing the distance between said surfaces.
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