Plastic pipe extrusion line comprises two pieces: head element and developing die. The head element of the extruder is the primary elements of extruding plastic molding; it turns the molten plastic from an extruder by a spiral motion into linear motion, and further, to make the required molding stress, guarantees the dense, in order to get the continuous segment bar together with the similar part shape. The forming die generally adopts the cooling, stress or vacuum suction strategy, stabilizes the shape on the plastic within the tip, and coining, to be able to get plastic molding that has far more accurate segment and glossier surface.

The head portion of the extruder is usually categorised by plastic pipe production machine, quite often together with plastic pipes, rods, plates, sheets, webs, monofilament, aggregates, many special-shaped substance, blown film, wire, cable etc.

In line with the extruding course of the product, it can be divided into directly head and lateral head. The course of the stuff from the straight head aligns using the extruder’s screw axis, such as tricky tube head; but within the lateral head, material move course is at an angle to extruder’s screw axis, this kind of as cable head. As per the head strain measurement classification is usually divided into very low pressure head (stream strain below 4MPa), center strain head (stream stress 41OMPa) and higher stress head (stuff movement strain is bigger than 1OMPa).

The ideas of extrusion head style and design which includes:


Streamline cavity. To be able to make the plastic melt flow alongside the channel efficiently and with success extruded, the head’s cavity should certainly be easily shaped, the floor roughness should certainly be considerably less than1.6-3.2µm.

2. Sufficient compression ratio. As a way to make the items compacting and eliminated the seam resulting from divider brace, in line with the different types of items and plastic, the extrusion head ought to be designed with adequate compression ratio.

three. Correct shapes and dimensions with the part. Owing to the die swell effect caused by the plastic physical performance and strain, temperature and also other factors, and the shrinkage effect due to traction, which make the head of your molding part form and dimensions is not as same as required, so the design should really make proper shape and dimension compensation to the suggestion, and reasonably determine the flow channel measurement, control the suggestion molding length, so that you can get the right form and dimension.

4. Rational selection of materials. The wearing is great when the movement channel engages with all the flowing plastic melt; in significant temperature molding process, some with the plastics will produce chemical gas which will corrode the channel. So as a way to improve the service life of the machine, the head materials should be selected for wear and corrosion resistance, higher hardness of steel or alloy steel.

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