B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
26/123, 154/27
B29C 65/02 (2006.01) B29C 43/22 (2006.01) B29C 61/06 (2006.01) B32B 37/30 (2006.01) F16L 47/22 (2006.01)
Patent
CA 1193180
IMPROVED PROCESS AND APPARATUS FOR PREPARING LAMINATED HEAT-SHRINKABLE STRIP WITH ELECTRIC CONDUCTOR WIRE EMBEDDED THEREIN ABSTRACT OF THE DISCLOSURE There are provided improved process and apparatus for preparing a laminated heat-shrinkable strip comprising upper and lower heat-shrinkable sheets fused together with an electric conductor wire sandwiched therebetween as means for covering and protecting joints of steel pipes of oil pipelines or cables. The process comprises the steps of: subjecting successive sections of a starting strip with the sheets unfused, while said section are stationary, to a pressing operation, each operation consisting of simul- taneously prehot-pressing a first length which is slightly longer than half a predetermined length, hot-pressing a second length which is adjacent to said first length and which is the same or longer than said predetermined length, and cold-pressing a third length which is adjacent to said second length and which is slightly longer than half said predetermined length, and; shifting forward said starting strip by an amount corresponding to half said predetermined length after completion of each said pressing operation and before the start of each next pressing operation. The apparatus comprises a prehot press, a main hot press and a cold press arranged in a series for carrying out the pressing operation and a conveyor system for the inter mittent shifting operation wherein a pair of looped teflon belts of a webbed pattern between which the starting strip is sandwiched, the strip being subjected to the pressures by the presses through the belts.
395868
Mitsumoto Takuo
Miyamoto Mamoru
Takahashi Yuzo
Goudreau Gage Dubuc
Ube Industries Ltd.
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