Reasons for failure of TPU sealing machine

The TPU film sealing machine is a process of applying polypropylene, polyethylene and other plastic films with a layer of adhesive symmetrically according to the mechanical equipment. Under a certain temperature and the working pressure of the mechanical equipment, it can be firmly bonded to the printing paper. . In the sealing film processing process, the direct relationship between working pressure and time factors should be resolved, and the welding process should control the viscosity of the adhesive, the clamping force, the temperature of the curing oven, the temperature of the hot roller, the working pressure of the mechanical equipment, and the speed of the mechanical equipment. It can prevent problems such as blistering during film sealing and weak bonding between paper and plastic.

The TPU sealing machine process stipulates that the production staff engaged in sealing film mechanical processing should apply appropriate production and processing temperature and working pressure according to the characteristics of printing paper and printing ink, so that the adhesive will make the plastic film and printed matter printing paper firm Bonded into a paper-plastic unit. Sealing film product quality specifications: the surface is clean, flat, not fuzzy, smooth, no wrinkles, no bubbles, no separation of paper and plastic, no powder and foil marks. The dryness level is moderate, and there is no sticking to the surface plastic film or printing paper. After the film is sealed, the split specifications are accurate, the edges are smooth, and the film cannot be delivered. There is no significant curling, twists and turns.

The printed matter deeply processed by the plastic film composite technology, under normal circumstances, has various box packaging such as advertising and publicity albums, various desk calendars, book covers, packaging food boxes, wine box packaging, etc. After the surface layer of the printing paper has been solved by the TPU sealing machine, the packaging and printing products will also undergo expansion, scraping, pasting, baking, film cutting, embossing and other printing methods. In addition, it will also suffer from the influence factors of packaging, printing, text, graphics, printing ink, paint thinner, various organic solvents, moisture and dry oil, corrugated cardboard support glue and other compounds. The printed matter after the film is also subject to stretching and scratching. The impact of external forces such as, pressing, film cutting, etc., can withstand high-temperature baking and direct exposure to natural light and ultraviolet light, in a humid and cold natural environment. Only when these standards are taken into consideration, can the products of the sealing machine be regarded as qualified packaging and printing products.