Long plastic layer with embossing in register with pattern and rolling method and device therefor

A rolling method for producing a long plastic layer with an embossing in register with a pattern, comprising:

• a feeding step of feeding a plastic layer to be rolled into oppositely rolling rollers by a feeding roller, the plastic layer being printed with repeating unit patterns;
• and
• a rolling step of hot rolling an embossing on the plastic layer;
• in the feeding step, a front side of the plastic layer being adjacent to an embossing roller formed by one of the oppositely rolling rollers, and an embossed pattern disposed around an outer surface of a cylinder of the embossing roller corresponding to a pattern of one unit pattern on the plastic layer,
• wherein a longitudinal deviation of the embossing is adjusted in the rolling step, an adjusting step comprises:
• detecting the longitudinal deviation between the pattern on the plastic layer and the embossed pattern on the embossing roller by sensing a position of a preset part in each unit pattern on the already stretched plastic layer after the feeding roller and prior to entering the oppositely rolling rollers, and detecting a position of a corresponding part directly on the embossing roller corresponding to the preset part prior to embossing, and
• wherein said detecting is of a distance difference or a time difference of signals detected by a first sensor for detecting the position of a preset part and a second sensor for detecting the position of a corresponding part, and
• adjusting a feeding tension of the plastic layer according to the longitudinal deviation, so as to adjust a stretching length of the plastic layer between the feeding roller in the feeding step and the oppositely rolling rollers in the rolling step before rolling and thereby embossing, so that the longitudinal deviation in subsequent rolling is reduced until the embossed pattern is longitudinally in register with the pattern on the plastic layer during rolling,
• wherein the registering of the embossing on the plastic layer and the pattern on the plastic layer is realized during the rolling by the embossing roller;
• and
• wherein the feeding roller only feeds the plastic layer into the oppositely rolling rollers;
• wherein the method further comprises the step of controlling the heating temperature of the oppositely rolling rollers by a control device controlling a hot medium flowing into the oppositely rolling rollers.