Polymer material pipe single-screw continuous extrusion forming cylinder forming method and forming device thereof

Abstract

The invention relates to a polymer material pipe single-screw continuous extrusion forming cylinder forming method and a forming device thereof. The method sequentially comprises the following steps that: when a screw is static, the front end cylinder provided with grooves performs a rotary movement, and drives a polymer material to move forward along with the screw grooves, such that the polymer material is compacted gradually; when the polymer material reaches the line section of the screw ridge line, the movement direction of the polymer material is parallel to the direction of the screw, and then the polymer material reaches the forming smooth rod section of the screw, the polymer material is filled in the formed spaces between the cylinder and the screw to form a polymer material pipe billet; then the billet is heated and plasticized to obtain the polymer material pipe. According to the present invention, with the shaped mandrel and the shaped sleeve, the homogenizing processes of the temperature and the geometry size of the polymer material pipe are realized; the cooling sleeve is adopted to complete the cooling and shaping process; the forming accuracy and the forming stability of the polymer material pipe billet are improved.

Description

technical field [0001] The invention relates to a single-screw continuous extrusion molding machine barrel molding method and molding equipment for polymer material pipes with poor or even no melting fluidity. Background technique [0002] At present, the commonly used molding methods for the molding of polymer material pipes with poor fluidity are: plunger extrusion molding; polymer materials are modified by flow process to increase their molding fluidity, and ordinary single-screw extrusion molding is adopted; Single-screw extrusion barrel molding method for ultra-high molecular weight polyethylene pipes. [0003] Plunger extrusion molding can be regarded as continuous sintering molding. The molding process of this method is discontinuous, the plasticizing time is long, the production efficiency is low, and it is not suitable for molding large finished products, so it is limited in production and application. [0004] After modifying the flow process of polymer raw materi...

AI Technical Summary

Problems solved by technology

However, the movement form of the pipe parison formed by the patent ZL200710053227.2 technology is difficult to control. On the one hand, the pipe parison rotates with the screw, and on the other hand, it moves relatively linearly with the screw groove. The absolute movement of the pipe parison is a spiral motion.

During the forming process, with the reduction of the concentricity of the screw, the geometric dimension accuracy of the UHMWPE pipe parison formed by the space formed between the polished screw rod and the barrel is reduced, which affects the precise shaping of the UHMWPE pipe and the stability of the UHMWPE pipe forming.

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