B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/663
B29C 67/20 (2006.01) B29C 47/90 (2006.01)
Patent
CA 1143117
ABSTRACT The manufacture of material webs of foamed plas- tics generally takes place by extrusion of the material in tubular form, whereupon the material whilst it is still in soft condition is calibrated, that is to say expanded by means of a mandrel, so that the desired tube diameter and thus the desired material thickness is obtained. The material tube is then cooled and cut up axially and laid flat to a web. This manufacturing procedure gives a final product with uneven surface, since the pores and craters which the material surface presents will be enlarged when the tube is expanded. Moreover, the cooling as well as the contact pressure of the material against the mandrel will be varying, which further increases the unevenness of the surface and gives the material an uneven quality. A more uniform material surface and a more homogeneous material tube is obtained in accordance with the invention, in that the material tube after extrusion is pressed, by means of compressed air introduced into the tube, against an outer calibration element and is cooled at the same time, so that its temperature drops below the softening temperature of the material. In this way the cooling as well as the contact pressure can be controlled, and by imparting more- over a profiled surface to the outer calibrating element, a rational manufacture of a material web of foamed thermo- plastics of good quality and uniform surface is made poss- ible.
333657
Andren Sven-Olof
Ljungberg Per-Allan
Nilsson Lennart
Marks & Clerk
Tetra Pak International Ab
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