Aluminum foil sealing cover is analysed the reason of stratification
aluminum foil sealing cover film production common problem is usually stratified, folds, heat sealing, etc. Today, we would like to discuss what is the aluminum foil sealing cover membrane for the cause of the production stratification.
layer is due to the glue in production process are not enough as a result, the aluminum foil sealing cover film glue not enough reason has the following several aspects:
a is improper glue and curing agent ratio of mix, or already in kaifeng improper the preservation of the infiltration of impurities, or composite machines and composite production environment problems caused by evaporation.
2 is a problem of composite aluminum foil sealing cover membrane equipment, may be insufficient tension adjustment, may be insufficient pressure, may exist rubber roller wear lead to problems such as no glue, or caused by inadequate oven temperature curing solvent evaporation.
three is a problem of curing time, curing insufficient room temperature curing agent evaporation.
4 is the problem of raw materials, may not have corona raw material on both sides, or hot cover face turned to composite with the corona field.
five is when faced with the complex paper aluminum foil sealing cover membrane, may the weather reason wax, but more paper is largely due to a lot of kinds, the fiber strength of paper also wax for the same will be the risk of wax paper photograph sex discrepancy.
six is the sealing aluminium film put a long time over shelf life, this is most likely to occur in the paper gasket, over time, the paper with wax will due to contact air moisture and high temperature changes on the edge of separation. May first is the insufficient sealing foil cover the surface tension of the membrane material and difficult to embellish leaching; Second is due to the inside of the solvent water too much lead to H2O and solvent inside the NCO carbon dioxide bubbles.
in addition, in the process if the sealing of extrusion of aluminum foil cover film glue stick enough or stick the body temperature is too low, the glue is not enough, difficult to active flow and net flow uneven glue these reasons will produce bubbles.
aluminum foil sealing cover film and the installation Angle between the roller not cooperate, air too much water in production environment, do not pay attention to indoor ventilation dust adhesion and aluminum foil sealing cover membrane materials will lead to the ash layer two layers of aluminum foil container space jacked up to form a ring sealing film, characterized by a little bubbles with black spots.
