In the process of making ziplock bags, some processes will affect the shrinkage of the ziplock bags. You need to pay attention during the production process to prevent the ziplock bags from failing. Next, the editor will summarize several types of factors that affect the ziplock bags. Factors affecting bag shrinkage.
The hazards of the ziplock bag own structure
In the same ziplock bag, the shrinkage rate in the area with smaller thickness is lower than that in the area with larger thickness. The shrinkage rate in the area away from the insert is much greater than the shrinkage rate in the area close to the insert.
It shrinks vertically in the direction of fluidity and fluidity. There is a difference in the rate. Generally speaking, the shrinkage rate in the direction of flow is higher than the shrinkage rate in the direction vertical to the flow. The shrinkage rate of the ziplock bag in the direction of obstruction will be lower than the shrinkage rate of the direction without obstruction.
The impact of materials on the shrinkage rate of ziplock bags
The shrinkage rates of ziplock bags made of different materials are also different, but the shrinkage rates of different production batches of ziplock bags made of the same material are also different, mainly due to the influence of the production and processing process. The crystalline plastic The shrinkage rate is much greater than that of unshaped plastics.
Plastics with poor fluidity have a large shrinkage rate during molding, while plastics with good fluidity have a small shrinkage rate. Adding fillers to the plastic will also lead to a significant decrease in the shrinkage rate of the molded plastics. Plastics that do not contain fillers The shrinkage rate is higher after production and forming.
The impact of pressure and ambient temperature on the shrinkage of ziplock bags
If the working pressure is too high, the sealing performance of the ziplock bag will be improved, resulting in a reduction in shrinkage. If the temperature of the raw materials used to produce the ziplock bag is increased, the water absorption and expansion of the ziplock bag will be reduced, and the input of raw materials according to the pressure will be reduced, which will promote the expansion of the shrinkage rate.
However, the increase in temperature of the material will cause the viscosity to decrease, and the increase in viscosity will increase the pressure in the die, which will promote the reduction of the shrinkage rate of the ziplock bag. Therefore, it is fully considered that the influencing factors that affect the shrinkage rate of the ziplock bag are both the environmental temperature of the pressure material and the shrinkage rate of the ziplock bag. Comprehensive hazards.
