Push rod insulation? The blank is put into the barrel of the extruder for cold extrusion. In order to make the fibrosis uniform during the pushing process, the mould and roller should be heated properly.
Generally, the mold temperature is generally controlled at 50 ℃ ~ 60 ℃ and the barrel temperature is 30 ~ 35 ℃. In the extrusion process, there must be a gap between the entrance of the male die line and the female die.
If the gap is too small, excessive shear will occur when the resin cluster mold flows outward, and the macromolecules will be excessively fibrillated.
Polytetrafluoroethylene film will lead to insufficient transverse strength. This is an important reason for the longitudinal alignment of insulation. The phenomenon of wire sloshing and internal cracks in insulation and insulation "bushing" phenomenon.
On the other hand, if the gap is too large, the pressure will increase, the coating will become tight, and the surface will become smooth. However, due to the large adhesion, when the resin flows out of the mold, it is easy to cause the so-called "gourd" and "loose flower" of the core.
It is difficult to promote and carry out smoothly, so it is particularly important to control the driving force reasonably.