Abstract:
In order to prevent the adhesive pattern on labels from misalignment, inaccurate shape or uneven adhesive thickness in a self-binding soft packets, a new type hot melt pressure sensitive adhesive application system was designed, which comprised an adhesive pot, an adhesive pipe, an adhesive gun, an operation panel, a controller, an encoder, a sensor, wherein the adhesive was applied by scraping to ensure good appearance. A label guide was designed to ensure the label positioning during scraping. The start and stop positions of scraping were monitored by pulse positioning method. I/P converter was utilized to harmonize the pressure in adhesive pot with the running speed of the packer. The scraping adhesive pattern was tested by setting its length and width 45 mm and 4 mm respectively, and the results showed that: 1) The longitudinal and transverse position errors of scraped adhesive pattern were ± 1.100 and ±0.375 mm, respectively; which met the requirements of cigarette packing quality and satisfied the needs of self-binding soft packer. 2)Setting the start and stop positions of adhesive scraping at the middle of label running speed curve would obtain an adhesive pattern with accurate position and good appearance.