The bubble film machine can add transparent and thin plastic membranes to the surface of the printing of the film. The surface of the print will be smoother, which not only increases the gloss and firmness of the print, but also extends the service life of the print. At the same time, plastic film plays a protective role in waterproof and moisture -proof. Bubble film machines and steam fabrics have anti -pollution, abrasion resistance, compromise and chemical corrosion.
In the process of blowing the film machine, the low -density polyethylene is squeezed out of the mold from the mold, and it has good transparency. After leaving the mold, it should be blown by cooling the film bubbles through the cooling air ring. When the cooling air blows at a plastic film bubbles just squeezed out of the mold at a certain angle and speed, the high -temperature thin film bubbles are in contact with the cooling air. Below the viscosity flow temperature of low -density polyethylene, so that it can cool and solidify it and become blurred.
On the blistering of the membrane, we can see the dividing line between the transparency and blurry of the bubble film machine, which is the dew point (or frost line). In the process of blowing the membrane machine, the height of the dew point has a certain effect on the performance of the membrane.
If the dew point is high and located above the bubble of the expansion, the film expands in liquid. Expansion will only make the film thinner, and the molecules will not be stretched. At this time, the performance of the inflatable film is close to the delay membrane. Instead, if the dew point is relatively low, the inflation is performed in solid state. At this time, the plastic of the composite bubble film machine and the bubble cloth machine is in a high elastic state, and the expansion is like stretching horizontally, causing the molecular orientation to make the performance of the expansion membrane close to the directional membrane.
The foam film traction ratio is a longitudinal stretch multiple, which makes the film has a directional effect in the direction of stretching. If the traction ratio increases, the longitudinal strength will also increase, and the thickness of the membrane will become thinner. However, if the traction rate is too large, the thickness of the membrane will be difficult to control, and the membrane may even break, causing the membrane to rupture. The traction ratio of the low -density polyethylene film of the composite bubble film and the bubble cloth machine is usually controlled between 4 and 6.
