Composite membrane curing fault case analysis

1, composite PE BOPA film strength low hunan a factory/PE composite bags, because of low strength by return. The two layers membrane peeling, his fingers on the PE film after wiping, friction between two fingers feel smooth. The smooth agent precipitation film is more. , the product using adhesives is the PU - for smooth agent has certain resistance 1850. To color, found that after curing room temperature measuring thermocouple parallel to the heating source, only 30 ~ 40 cm, away from heat source under such control, stop heating heat source for long periods, the actual curing temperature is amounted to less than 50 ℃. And open the power supply heating curing time less than 16 hours. Adjust the thermocouple location and prolong the curing time, met the requirement of the peel strength. High content of compound smooth agent PE film, should choose to smooth agent have certain resistance rubber adhesion agent. As soon as possible after the film roll off the plane into the aging chamber, and appropriately raise the curing temperature. General ester solvent type natural curing two-component polyurethane adhesives smooth agent resistance is poor. 2, the friction coefficient increases a factory production of BOPP/VM - in guangdong The structure of the PET/PE film, winter production has no problem. Production in June, the increase of friction coefficient, the packing machine can't normal use. Instead of natural aging, membrane volume still can't use. The product with 30 mu PE film, the thickness of the composite good smooth before. When the composite cooling roll not cold water, cooling roller surface is warm. Winding former film heat from the oven, winding the film is also warm. Although it is in the workshop natural curing, the summer high temperature ( At 10 am workshop temperature 30 ℃) , the film roll own difficult to heat, in fact, are in a state of heat. Field in complex plane membrane, on 27 ℃, 45 ℃ about 20 hours of two kinds of circumstances, 27 ℃ placed under smooth sex good, under 45 ℃ placed composite membrane of the acerbity, smooth significantly reduced, the impact of temperature on the product smooth. And some of the thickness of the thin transparent CPP is sensitive to temperature, compound CPP before friction coefficient is lower than 0. 1, but only after composite natural aging. 3, cooking delaminating production at a factory in wenzhou marinated egg bags, 30 minutes at 115 ℃ in food sterilization, sterilization pot bag several layers above BOPA stratification, huai ink transfer to the CPP. Color technicians believe that the quality of the adhesive, glue quantity is to be able to clear enough product requirements, aged 50 ℃ ~ 55 ℃ for 48 hours of curing is required, the problem in the printing ink of possibility is very large. The samples bag again aged 55 ℃ for 24 hours, 121 ℃ cooking 30 minutes without delaminating phenomenon; And cooking together not in curing samples all appear to take off the floor. Direct expression is transfer ink, the problems and the causes of this phenomenon is not fully cure. Later, the company's other technical personnel to the factory found that the actual curing time in 36 hours, the plant process requirement and the actual execution time.