What is a plastic extrusion mold

Plastic extrusion mold refers to the mold for producing plastic profile products with continuous shape, also called extrusion mold, extrusion head or die.

The principle of plastic extrusion mold:

The word extrude is composed of the Latin words "ex" (to leave) and "trudere" (to push), which vividly describes the extrusion process of "applying pressure to force a material through a die". During the processing of the extrusion die, the polymer in powder or granular form is usually added into the extruder barrel. Under the action of the screw or plunger, the polymer moves forward along the screw groove or barrel and gradually melts. It becomes a viscous fluid, and then passes through the mold set at the end of the barrel to form a continuum similar to the shape of the die of the mold. Finally, after cooling and shaping, it can be formed into products of the desired shape, such as various plastic pipes and rods. , Sheet, plastic steel doors and windows, film, decorative skirting and other plastic extrusion mold general design points Extrusion mold is the core part of extrusion production, the technical status of extrusion mold is directly related to the stability of extrusion production, extrusion The quality of the products, extrusion production efficiency and the service life of the mold itself. Therefore, the design of the extrusion mold is very important.

When designing the machine head, the following points should be paid attention to:

1. The inner cavity of the machine head should be streamlined, so that the material can be extruded evenly along the flow path of the machine head, to avoid the overheating decomposition of the material due to stagnation, and it must not shrink sharply in the machine head, let alone dead corners and stagnant areas. , the flow channel should be made as smooth as possible, and the recommended surface roughness Ra value is 0.4μm

2. Sufficient compression ratio According to different plastic products and plastic varieties, design a machine head that can generate enough compression ratio to eliminate the joint seam caused by the shunt bracket and make the product dense.

3. The correct cross-sectional shape is different from the real cross-sectional shape of the product due to the performance, pressure, density, shrinkage rate and other factors of the plastic. The die has a reasonable cross-sectional shape.

4. Compact rhythm, easy to disassemble and assemble Under the condition of satisfying mechanical properties, it is necessary to design a machine head with rhythm, tight joints, uniform heat transfer, easy disassembly and assembly, and no material leakage.

5. Reasonable selection of materials The machine head should be made of steel with corrosion resistance, friction resistance, good tensile strength and high hardness. Some are also chrome plated according to the situation.

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