| 摘要 |
PCT No. PCT/DE93/00842 Sec. 371 Date Feb. 21, 1995 Sec. 102(e) Date Feb. 21, 1995 PCT Filed Sep. 13, 1993 PCT Pub. No. WO94/06616 PCT Pub. Date Mar. 31, 1994.A plastic web is formed by introducing flowable plastic material to an upper inlet side of a nip formed by a pair of rolls to form a bead of the material at the inlet side, while removing the web from a lower outlet side of the nip. The birefringence of the web is measured at points across the web width, and the rate of plastic introduced to the nip inlet side is regulated in accordance with the measured birefringence to form a substantially uniform bead height along the nip inlet side.
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