Plastic profile extrusion die head allowing material flow speed at single arm parts to be adjusted

Abstract

The invention discloses a plastic profile extrusion die head allowing a material flow speed at single arm parts to be adjusted. The plastic profile extrusion die head comprises a neck adapter, a support plate I, a support plate II, a compressing plate, a preforming plate and a forming plate, wherein a gas flow channel distributed in the parison flowing direction is arranged in the position, corresponding to a cavity wall, of each cavity single arm part, of the compressing plate or the preforming plate, and a gas inlet channel and a gas exhaust channel which are communicated with two ends of the gas flow channel are formed in the side wall of the compressing plate or the preforming plate and distributed sequentially in the parison flowing direction; high-temperature and high-pressure gas is guided into the gas flow channel, the cavity single arm parts are locally heated, the flowability can be improved, the temperature or pressure of input gas is adjusted, the temperature of a corresponding area of the preforming plate can be controlled, and speed control of material flow is realized.

Description

technical field [0001] The invention relates to an extruding die head of plastic profiled material, in particular to an extrusion die head with adjustable material flow velocity of single arm part of plastic profiled material. Background technique [0002] For some special profiles, due to installation or fixing needs, the surface of the profile has a single arm that protrudes outward, such as Figure 7 As shown, there are single arms 92 on both sides of the upper and lower two large surfaces 91 of the profile 9 respectively. When extruding these single-arm plastic profiles, the outer surface of the single-arm 92 fits the wall of the cavity in the extrusion die head. Due to the large contact area of ​​the single-arm, as the extrusion process continues, the corresponding cavity The precipitates adhered to the wall surface continue to increase, which increases the friction at the position of the single arm, which easily leads to a slowdown in the discharge speed of the materia...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies of the prior art, to provide an extrusion die head with adjustable material flow velocity in the single-arm part of the plastic profile, which can regulate the temperature of the single-arm part of the cavity according to changes in production factors, and change the cavity The flow performance of the single-arm part makes it consistent with the flow rate of the parison, so as to overcome the problem of unqualified single-arm molding caused by uneven discharge

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