Causes and Countermeasures for Longitudinal and Transverse Wrinkles in Film Slitting Machines

Time:

Apr 12,2021

With the continuous improvement of technology,slitting machine for filmsthe length of bottom wrinkles is getting shorter. It is worth noting that sometimes the bottom wrinkles are not caused by unreasonable slitting parameter settings, but rather due to the operator's lack of responsibility, who does not properly align the film with the paper tube and instead casually places the film on the paper tube before starting the slitting process, artificially creating quality issues with bottom wrinkles. This must be taken seriously to eliminate human-induced quality defects and improve the slitting quality of the products.

(2) Causes and countermeasures of longitudinal wrinkles
Longitudinal wrinkles refer to the rib-like stripes formed on the surface of the film roll. The main reasons for the formation of longitudinal stripes during the slitting process are the large amount of air trapped in the film roll or uneven thickness accumulation. Once severe stripes appear, they are difficult to eliminate. When longitudinal wrinkles occur during the slitting process, it is generally advisable to reduce tension and increase pressure to expel the air from the film roll to improve the longitudinal wrinkle issue, but the adjustment range should consider the impact on bottom wrinkles and other aspects. Another reason for the occurrence of longitudinal wrinkles is the impact of equipment operating precision. Since plastic films belong to polymer products and are very thin, they are more susceptible to damage during processing. Therefore, if the operating precision is insufficient, it is easy to produce quality issues such as longitudinal stripes. For this reason, when replacing equipment components and accessories, caution should be exercised, and durable, high-precision components should be selected. Additionally, certain precision must be ensured during installation; otherwise, it will be difficult to meet the operational needs of the slitting machine. The flattening roller can flatten the film and eliminate some longitudinal wrinkles caused by stretching stress.
(3) Causes and countermeasures of transverse wrinkles
In addition to the influence of the parent roll, the main cause of transverse wrinkles in the film is the production of pit-like transverse wrinkles due to the loose inner and tight outer conditions of the slitting film roll. Generally, this is caused by reducing pressure during the slitting process to minimize bottom wrinkles. Effective adjustments to slitting tension and pressure should be made for different product models to effectively eliminate the occurrence of transverse wrinkles.