The Art of Roller Surface Pretreatment
The embossing effect of polyurethane rollers begins with the condition of the roller surface. New rollers require 24 hours of low-speed break-in before use, with the speed controlled at 15-20 rpm. After break-in, the roller surface temperature should stabilize within the range of 25-30℃, at which point a uniform micro-texture layer will form on the surface. For daily maintenance, it is recommended to use a special cleaning agent with a non-woven cloth to wipe the surface, avoiding fiber residue that could affect the clarity of the texture.
The Golden Rule of Pressure Control
Pressure adjustment is the decisive factor in embossing quality. For common PVC materials, an initial pressure setting of 0.3-0.5 MPa is suitable. When observing the embossing depth, it can be detected by white light refraction: ideally, the edge of the texture should present a continuous light band. Pressure adjustment should follow the principle of "increase first, then decrease," with each adjustment not exceeding 0.05 MPa, and the effect observed after 15 minutes.
Precise Control of Temperature Balance
Temperature and pressure have a linked effect. When the ambient humidity exceeds 60%, the roller temperature needs to be increased by 3-5℃ to compensate. Infrared thermometers are used to monitor the temperature difference on the roller surface, and longitudinal fluctuations should be controlled within ±1℃. When creating special patterns, local temperature differences can be achieved through zoned heating, but the temperature difference between adjacent areas should not exceed 8℃, otherwise stress patterns may easily occur.
