Low pressure plastic raw materials in the process of blowing the two sides of the fold, how to deal with?
However, blow ratio can not be too large, otherwise easy to cause the bubble unstable and prone to wrinkle film. Therefore, the blow up ratio should be equal to the traction ratio. Generally speaking, the blow up ratio of low-density polyethylene (LDPE) film should be controlled at 2.5-3.0.
Blow up ratio of transverse expansion ratio of the film, is actually on the orientation of the transverse tensile film, tension will have a certain degree of plastic molecules, the blowing ratio is increased, thereby improve the lateral strength of thin films.
The blowing ratio is one of the control points of blown film production and! Refers to the ratio between the bubble diameter and the diameter of not blowing blowing after.
