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What are the factors that affect the shrinkage of the ziplock bag?

Source: Time:2016-10-12 15:38:58 views:

In the process of producing ziplock bags, some processes will affect the shrinkage rate of the ziplock bags. Special attention should be paid to the processing
In the process of producing ziplock bags, some processes will affect the shrinkage rate of the ziplock bags. Special attention should be paid to the processing and production to avoid unqualified ziplock bags. Here are some common effects on the shrinkage rate of ziplock bags. the elements of.
1. The influence of the structure of the ziplock bag:
In the same ziplock bag, the shrinkage rate of the part with smaller wall thickness is smaller than the part with larger wall thickness, the shrinkage rate away from the insert part is larger than the shrinkage rate near the insert part, and the shrinkage rate perpendicular to the flow direction and the flow direction. There is also a difference. In general, the shrinkage rate in the flow direction is larger than the shrinkage rate in the direction perpendicular to the flow direction, and the shrinkage rate in the direction in which the ziplock is blocked is smaller than that in the unobstructed direction.
2. The effect of raw materials on the shrinkage rate of ziplock bags:
The shrinkage rate of ziplock bags produced from different raw materials is also different, but the shrinkage rates of different batches of ziplock bags produced by the same material are also different, which is mainly affected by the processing and production process, and the shrinkage rate of crystalline plastics. If the plastic is larger than the amorphous plastic, the plasticity of the plastic with poor fluidity is large, and the shrinkage of the plastic with good fluidity is small. If the filler is added to the plastic, the shrinkage of the molded plastic will be significantly reduced, and the plastic without the filler will be produced. The shrinkage after molding is better.
3. The effect of pressure and temperature on the shrinkage of the ziplock bag:
If the pressure is too high, the sealing of the ziplock bag will increase, resulting in a decrease in the shrinkage rate. If the temperature of the raw material for producing the zipper bag is increased, the volume of the ziplock bag will be expanded, and the amount of material entering through the pressure will be reduced, so that the shrinkage rate is increased. However, the increase in the temperature of the raw material causes the viscosity to decrease, and the viscosity becomes smaller, which causes the pressure in the cavity to increase, so that the shrinkage rate of the ziplock bag is reduced, so the factors that ultimately affect the shrinkage rate of the ziplock bag depend on the pressure and the raw material temperature. The combined impact of the person.

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