How to judge whether the Heat sealing strength of packaging bags is good or not

by:Nanxin Print & Packaging     2020-03-08
From the appearance, if there is shrinkage at the Heat sealing end, it means that the temperature of the heat sealing bag is too high, and it should be reduced a little. In principle, the Heat sealing temperature should be below the heat setting temperature of the outer film of the composite film and above the melting temperature of the resin in the inner sealing layer. The higher the hot air temperature is, the greater the Heat sealing strength is, but exceeding the heat setting temperature of the outer two-way stretch film may shrink the sealing end. The simple identification method of hot air intensity is to put your hand into your pocket and push the edge of the bag out. If you push it out and peel it off, the Heat seal is not good, and vice versa. If you want to tear at the seal, tear off the film and tear off the heat-sealing film, it is good, otherwise it is not good.
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