Lateral calendering

Details Lateral calendering Lateral calendering

B - Operations, Transporting

29

C

18/1044

B29C 55/18 (2006.01) B29C 55/02 (2006.01) B29C 55/08 (2006.01) B29C 55/14 (2006.01)

Patent

CA 1316320

ABSTRACT Sheet material 4 is stretched transversely into longitudinally extending pleats by passage between intermeshing grooved rollers A and B having circularly or helically extending grooves in their surfaces. Each groove is formed of a base 6a, 6b and side walls 5a, 5b inclined outwardly to a peak 7a, 7b. Portions of adjacent side walls 5a and 5b are parallel to one another. The peaks are less than about 3mm apart and the film is stretched by the peaks and is compressed between the side walls by forcing the rollers together. The pleated material is generally then stretched longitudinally substantially to eliminate the pleats and it may then be again stretched transversely between a further set of intermeshing grooved rollers.

556633

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