Plastic extrusion process and design considerations

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Process changes
Straight up the most common variant extrusion squeezed double. Here, a "side machine" (about 1/4 or smaller of the size of the mainframe) runs in series with the mainframe, supplying different materials to the mold, where the flow merges into a single extrusion made of two bonded profiles or double durometers. Out of things. . Another common change is the crosshead extrusion. In the process, the plastic flow is changed to allow solid materials, such as copper wires or glass fiber bundles, to enter the melt stream and become part of the extrusion. Crosshead extrusion is used when such reinforcement cannot pass through the machine's screw and barrel.

Part geometry
The material gradually melts as it passes through the cartridge and comes out of the mold. Since it is liquid when it leaves the mold, the wall thickness must be uniform and the shape is symmetrical.

material
Most thermoplastics can be extruded, including LDPE, HDPE, ABS....etc. Glass fibres, carbon fibres, aramid fibres, glass beads, stainless steel fibres and PTFE, as well as fillers for flame retardants and UV stabilizers can now be used.

tolerance
Because the extrusion is not 100% contained by the metal mold, the tolerance usually must be smaller than other molding processes. Although special tools can maintain tighter tolerances.

Mould
The basic extrusion die typically includes a flat die or a circular steel plate with an opening toward the contour shape. The streamlined mold is longer and has a gradual change in the shape of the profile from the circular to the outlet end. Streamlined molds are needed to get the highest yield, or use materials that burn easily when staying in a bucket.

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