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High temperature resistance of plastic packaging bags, the size of the high temperature stability

Author:plastic bag wholesaler    Time:15/09/07    Click:
    Bags of packaging materials in the process of printing and composite, the size of the membrane stability is very important, is the basic conditions of product quality.According to the composition of the membrane, the mechanical properties of different, they are in use process sometimes elongation, occasional contraction.


High temperature resistance of plastic packaging bags, the size of the high temperature stability
 
    For amorphous structure of the polymer, as long as the temperature below its t, then its size basically stable;Amorphous polymer tensile strength and modulus of elasticity is small, so the compound printing should be controlled with low tension, avoid drying material high temperature creep.In addition to pay attention to the temperature, solvent is amorphous polymer creep factor, adhesives and inks used in solvent if the film after excessive adsorption with amorphous structure, depress material butyl g, creep.

    Highly crystalline polymer materials, such as PET and PA, their good temperature resistance, good dimensional stability;But if the improper control of conditions in the process of membrane preparation, the film also easy to contract.Although in molecular structure can be higher crystallization of polymer, but their crystallization rate slower, if the material fails to reach a steady state thermodynamics of crystallization process, they were in the bake, traction, or will happen in the curing room during the process of secondary crystallization, to contract.

    Aging treatment can well ensure the dimension stability of thin film, the higher curing temperature, the longer the time, the film structure tend to be more thermodynamics steady state, the better dimensional stability.Of course also should consider when curing film other performance, such as open sex.
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