The shortening rate of the parts with larger wall thickness in the same product is always greater than that of the parts with smaller wall thickness. The shortening rate of Zip Reclosable Lock Bags in the obstructed direction is always smaller than that in the unobstructed direction, and the shortening near the embedded part is smaller than that far away from the embedded part. The shortening of complex shaped products is smaller than that of simple shaped products. There is also a significant difference between the shortening in the direction of activity and perpendicular to the direction of activity, generally with the shortening rate in the direction of activity being greater than that perpendicular to the direction of activity.
Secondly, improving the temperature of the self sealing bag mold will generally increase the shortening rate, and for crystalline plastics. Extending the holding time can reduce the shortening rate. But once the gate has been closed, extending the holding time will not affect the shortening rate.
Another point is that increasing pressure can lead to an increase in density of Resealable Packaging Bags, reducing the shortening rate. Improving the material temperature will cause the volume of the product to expand and reduce the amount of material pressed into the mold cavity, resulting in an increase in the shortening rate; However, an increase in material temperature will reduce viscosity, which is beneficial for transferring pressure to the mold cavity and reducing the shortening rate. Ultimately, the magnitude of the shortening rate depends on the inductive influence of these two effects. Plastics that are generally sensitive to temperature changes have a greater impact on the latter effect, resulting in a decrease in shortening rate. Plastics that are not sensitive to temperature changes have a greater impact on the former effect, resulting in an increase in shortening rate.
Bag transparent ziplock is mainly used for product packaging, storing food, accessories, drugs, cosmetics, frozen food, postal products, etc., moisture-proof, waterproof, insect proof, and to avoid scattering of things, with a summary effect, giving buyers a standardized image, and can also be reused. It will be tightly sealed with a quiet press, non-toxic, odorless, flexible, and easy to seal, which is very convenient.
If you want to know the factors that affect the shrinkage rate of ziplock bags, you are welcome to consult our customer service staff, we will serve you wholeheartedly 24 hours a day!