| 摘要 |
In a method of applying an outer coating on PVC profiles where in an extrusion process conducted in an extruder, after a main mouthpiece and before calibrators, at least one PVC foil of a certain color is added which is unwound from at least one roll and which by pressing by at least one rotatable cylinder is pasted to a profile moving from the mouthpiece along a longitudinal axis of the profile, at least one foil (32, 36) is pressed by a set of rotatable cylinders (41, 46) comprising at least a main rotatable cylinder (41) mounted on a main shaft (441) and an auxiliary rotatable cylinder (46) mounted on an auxiliary shaft (446), placed one after the other behind the main mouthpiece (23) and before the calibrators (50), and of which outer cylindrical surfaces have a different texture showing pits and ridges, and which in parts of outer cylindrical surfaces being in contact with the foil (32) with the certain color are displaced relative to each other transversely to the longitudinal axis (11) of the profile (10), and after at least a full rotation of the main rotatable cylinder (41) and/or the auxiliary rotatable cylinder (46) form a non-repetitive sequence of pits and ridges on a profile (10) surface during movement of the profile (10) along its longitudinal axis (11) due to pressing the foil (32) to the profile by means of a set of cylinders containing at least the main cylinder (41) and the auxiliary cylinder (46). |
