Special-purpose mould for cross-linked polyethylene tube

Abstract

The invention relates to a crosslink polyethylene tube special mould, which comprises an extruder and a shaping mould. The extruder is formed by a screw barrel and a screw in the barrel, and the shaping mould comprises a back mould connected at the tail of the screw barrel, while the back of the back mould is connected with a support plate with a diverting taper in the chamber of the back mould. Another side of the support plate is connected with a mould whose chamber contains a transition mould element fixed on the support plate, and the tail of the transition mould element is connected with a corn mould whose outer side is arranged with an opening mould, while a shaping space is between the corn mould and the opening mould. The outside of the opening mould is disposed with an opening mould press plate. The invention has the advantages in stable material flow in the chamber, high extruding speed and high tube quality. And the invention uses small screw lifting angle, shallow screw groove or the like to improve quality and yield.

Description

technical field [0001] The invention relates to a mold, in particular to a mold for manufacturing cross-linked polyethylene pipes. Background technique [0002] The cross-linked polyethylene pipe mold in the prior art has the following deficiencies: First, due to the design of the cavity inside the forming mold, the internal material storage area of ​​the mold is insufficient, and the speed cannot be increased. The second is that factors affecting product quality such as the plastic flow rate and flow rate delivered to the mold cannot be effectively adjusted in the mold, which will easily cause the extruded parts to have missing edges and uneven thickness, so that the quality of the plastic pipe cannot be further improved. In addition, when polyethylene is melt-extruded under the action of a catalyst, there are high requirements for temperature, feeding, compression, plasticization, and homogenization of the screw. The ordinary screw cannot meet the above requirements, resul...

AI Technical Summary

Problems solved by technology

[0002] The cross-linked polyethylene pipe mold in the prior art has the following deficiencies: First, due to the design of the cavity inside the molding mold, the internal storage area of ​​the mold is insufficient, and the speed cannot be increased.

The second is that factors affecting product quality such as the plastic flow rate and flow rate delivered to the mold cannot be effectively adjusted in the mold, and it is easy to cause missing edges and uneven thickness of the extruded parts, so that the quality of the plastic pipe cannot be further improved.

In addition, when polyethylene is melt-extruded under the action of a catalyst, there are high requirements for temperature, feeding, compression, plasticization, and homogenization of the screw. The ordinary screw cannot meet the above requirements, resulting in a decline in the output of the host machine. Defects such as over-crosslinking or under-crosslinking

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