PE high and low density plastic bags is now a very common kind of plastic bags, a lot of products in the packaging will choose to use PE high and low density plastic bags. Many consumers just know PE high and low density plastic bags, but for PE high and low density plastic bags is really not very deep understanding. Today, OPP bag manufacturers to introduce PE high and low density plastic bags is how to shape.
Crystalline material, moisture absorption is small, do not need to be fully dry, excellent mobility of the pressure-sensitive, easy to use high-pressure injection molding, the material temperature uniform, filling speed, full pressure should not use direct gate to prevent contraction Uneven, increased internal stress. Note Select the gate position to prevent shrinkage and deformation.
Shrinkage range and shrinkage value is large, the direction is obvious, easy to deformation warping. Cooling speed should be slow, mold set cold material, and a cooling system.
Heating time should not be too long, otherwise it will break down.
Soft plastic parts have a shallow side of the groove, can be forced release.
May occur melt rupture, should not be in contact with organic solvents to prevent cracking.
