ABS Products

Extrusion molds only under a certain working pressure to complete the melting of the provisions of this type of working pressure is called back pressure. The size of the back pressure is determined by the raw material of the molded plastic according to the gas pressure (p) caused by the flow path of the mold. Too low back pressure will cause the plastic to melt poorly, preserving the craftsmanship of the merchandise back pressure is too high consumes a lot of driving force, back pressure is too high is likely to produce an excessive amount of damage or damage to the machine and equipment. Hazardous elements of the back pressure: immediately jeopardize the billet cross-section of the multiplicity, the structure of the flow path of the material pipe, the extrusion rate of the billet, the rheological properties of plastics, and so on.

Extrusion mold only in a certain working pressure to complete the melting provisions, such working pressure is called back pressure.

The size of the back pressure is critically determined by the raw material of the molded plastic according to the gas pressure (p ) caused during the flow path of the mold. Too low back pressure will cause the plastic to melt poorly, preserving the craftsmanship of the merchandise back pressure is too high consumes a lot of driving force, back pressure is too high is likely to produce too much damage or damage to the machine and equipment.

The elements that jeopardize the back pressure: immediately jeopardize the multifaceted cross-section of the billet, the structure of the flow path of the material pipe, the extrusion rate of the billet, the rheological properties of the plastic.

The transformation of the flow path should be eased as much as possible

Boundary layer profile of the flow channel is streamlined and must not have sudden variations. Causes the raw material fluidity azimuthal transformation of the expansion and closing angle of the half angle of view is generally stipulated in the following 12.

Aluminum profiles must have a tea of pure cutting fluidity process before leaving the die shell.

In the pure cutting process, the raw material flow is ductilely loosened as much as possible in a single teal, in other words, a teal must have a long straight section (forming section) before the stamping die flow path enters or leaves the die.

The length of the parallel line segment is also never elongated. The longer the parallel lines, the greater the back pressure and the elevated electrical function loss.

Molded plastics stay longer in high-temperature areas, which is especially bad for PVC plastics.

Ultra-heavy molds are also not good for manufacturing and applications.

The surface of the flow path wall should be very smooth.

According to the flow path boundary layer of the situation, the flow path of polymer melt in the extrusion of the gas flow transport state is very harmful. Therefore, not only the smooth surface layer of the flow path wall is specified, but also the surface roughness is specified to be even. There can be no defects, no blind spots and burrs, and also the condition of jamming, which is crucial for PVC plastics.