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1．fibre drum The surface roughness has little effect on the bottom wrinkles. Ordinary surface fibre drum Compared to high-end paper tubes with polished surfaces, the bottom wrinkles of the film are not fundamentally different, and the difference in appearance quality grade is also very small. At the same time, the cutting speed and production efficiency were not reduced in the experiment.
2．fibre drum The straightness is the most critical influencing factor. Membrane（fibre drum）The wider,fibre drum The worse the straightness, the almost proportional increase in wrinkles at the bottom. For wide and heavy film rolls, while ensuring straightness, increasing the wall thickness of the paper tube appropriately and selecting better roll paper can improve the quality fibre drum The compressive strength (i.e. increasing rigidity) can reduce bottom wrinkles; If a larger caliber is used fibre drum The better the rigidity, the less wrinkles at the bottom.
3. Guarantee fibre drum The roundness (cylindricity) of the paper tube can reduce the jumping during rewinding, and the bottom wrinkles will correspondingly decrease. At the same time, the appropriate fit between the inner diameter of the paper tube and the card head prevents interference paper tube The wear of the inner wall contact area also helps to reduce wrinkles and stripes.
During the experiment, we found that the length of the bottom wrinkle is closely related to the set process parameters. Reasonable selection of workstations and setting of process parameters such as tension, pressure, and speed should be based on changes in film thickness, slitting width, and winding diameter, and adjusted appropriately according to the site conditions.
5. In terms of equipment, it is necessary to maintain stable control of parameters such as pressure, tension, and speed at each workstation to prevent sudden changes from affecting quality. The straightness, roundness, and surface quality (cracks, protrusions) of rubber rollers can all affect exhaust. Tests using new and old rollers have shown that the difference between the two can reach 30-40%. Therefore, it is necessary to replace expired rollers in a timely manner and select qualified rollers for large-sized film rolls.
6. Careful operation helps reduce wrinkles at the bottom, and selection should be checked and confirmed in advance fibre drum Standardizing the techniques of pasting thin films is also an essential guarantee that cannot be ignored.