B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1041
B29C 55/12 (2006.01) B29C 55/00 (2006.01)
Patent
CA 1062427
Abstract of the Disclosure A process is disclosed for the production of a stretched web of plastics material wherein a web comprising a thermoplastics resin is stretched uniaxially or biaxially by passing it through an apparatus com- prising two endless articulated chains positioned to run along opposite sides of the web to be stretched. A plurality of web-gripping devices are mounted at intervals along the length of each chain. These are primary and second- ary guide means for each chain for guiding the chain along a closed path in such a way that the degree of folding of the links of the chain can be varied at different points along the path, so varying the distance between adjacent gripping devices. Primary and secondary guide members are attached to each link of each chain and arranged to engage the primary and secondary guide means, respectively, and the web gripping devices are caused to grip and hold the web at a desired point along the path of each chain and to release the web at a second desired point along the path of each chain. Each primary guide member is a wheeled carriage arranged to ride on the primary guide means in such a way that each carriage can move along its associated primary guide means with wheels in rolling contact therewith while being substant- ially restrained by the reactions between wheels of the carriage and the primary guide means against rotation about three mutually perpendicular axes.
202298
Leese Leonard
Nicholas Donald C.
Smith Gordon C.r.
Stokes Geoffrey F.
Bakelite Xylonite Limited
Na
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