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Wenzhou Muyu Packaging Co., Ltd.
31
2022
-
05
Packaging pays attention to curing control in dry compounding
Curing, also known as curing, is the process of putting the composited film into the drying room (curing room) to make the main agent and curing agent of the polyurethane adhesive react and crosslink and interact with the surface of the composite substrate. The main purpose of curing is to make the main agent and the curing agent fully react within a certain period of time to achieve the best composite strength; the second is to remove the residual solvent with low boiling point, such as ethyl acetate.
The curing control is mainly the control of curing temperature and curing time. The curing temperature and curing time are determined by the performance of the adhesive used and the final performance requirements of the product. Different adhesive varieties have different curing temperatures and times. If the curing temperature is too low, below 20 °C, the reaction of the adhesive is very slow; if the curing temperature is too high, the substrate film additives will precipitate, which will affect the performance of the composite film and increase the odor. If the curing time is too long, it will also affect the performance of the composite film and increase the The odor is mainly caused by the precipitation of processing aids in the polyethylene film.
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