High and low on the outstanding issues prone to blowing machine
High and low on the outstanding issues prone to blowing machine
High and low pressure film blowing machine can only change the transparency of the film to a certain extent, where we analyze what might be the cause.
Furnace temperature is low, there is no cooling is good, raw materials are not pure or contain moisture content is too large. Secondly, the film has a hole in the middle that we can improve the electromagnetic heater and clean die, increase high and low pressure film blowing machine screw speed and other aspects, after the transformation of high and low pressure film blowing machine not only greatly improved performance, but also save electricity, stability is also enhanced.
Blow-up ratio is one of the control points of the production process of the blown film, is the ratio of the diameter of the bubble blown and not blow the tube between the ring diameter. The blow up ratio is a multiple of the transverse expansion of the film, in fact, transverse stretching the film, stretching the plastic molecules will have a certain degree of orientation effects, blow up ratio is increased, thereby improving the transverse strength of the film.
However, the blow-up ratio can not be too large, or likely to cause instability in the bubble, and the film is prone to wrinkles. Therefore, blow up ratio should be compared with the appropriate job with traction, in general, low density polyethylene (LDPE) film blow up ratio should be controlled at 2.5 to 3.0 is appropriate.