Transition ring connecting plastic extruder to die head

Abstract

The invention relates to a transition ring connecting a plastic extruder and a die head. A plurality of split flow channels are arranged in the middle of the transition ring, and the split flow channels include an outer split flow channel inclined from inside to The internal diversion channels are inclined from outside to inside, and the inner and outer diversion channels are alternately distributed along the circumferential direction on the transition ring. In the present invention, the internal material flow of the molten material is exchanged with the external material flow, and the molten material is further mixed, pressurized and plasticized during the process of passing through the inclined inner and outer flow channels, so that the flow into the die head The plasticization inside and outside of the material is uniform, and the material flow is stable, which can improve the physical properties of the profile.

Description

technical field [0001] The invention relates to a transition ring connecting a plastic extruder and a die head. Background technique [0002] During the processing of plastic profiles, the extruder is usually connected to the die head through an annular transition ring, and there is a flow channel in the middle of the transition ring. Runner, directly extruded into the flow channel of the extrusion die. Because the plasticization of the inner and outer layers of the molten material extruded by the barrel and screw of the extruder is not necessarily uniform in the flow channel, especially for old extruders, the gap between the barrel and the screw changes, and the inner and outer layers of the molten material cannot be guaranteed. With good plasticization, there are differences in material fluidity, uneven flow rate, and inconsistent melting pressure in the flow channel, resulting in differences in product physical properties. In severe cases, the physical properties of prof...

AI Technical Summary

Problems solved by technology

The perforated plate only pressurizes the extruded material, and cannot mix and recombine the material

However, due to the limitation of processing, the spiral mixer can only open a small number of spiral mixing chambers (usually 5 to 8) during production. In a small number of mixing chambers, it has little effect on increasing the pressure of the flow channel. Insufficient and precise mixing of inner and outer materials

Therefore, none of them can improve the physical properties of extruded profiles well.

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