Production of plastics sheet material

摘要

A protective film (31) is applied over the faces of formed plastics sheet material to protect the sheets in transportation and storage. The film (31) is led from one of a number of reels (33,34,35) over a guide and tensioning roller(32) and applied to a sheet (36) between a pair of nip rollers (37,38). The reels (33,34,35) which are of different width to accumulate sheets (36) of different size are mounted on a common carriage (40) having rollers (41) which run along corresponding transverse tracks (42) to position the film (31) relative to the sheet (36). The side edges of the sheet (36) are trimmed by cutting knives (50,51) and the waste sheet trim (52) is reground. The side edges of the sheet (36) are de-burred by de-burring rollers (55).