Technological method and device for preparing biaxial orientation plastic pipe through one-step method

Abstract

The invention relates to a technological method and device for preparing a biaxial orientation plastic pipe through a one-step method. The device comprises a plastic extruder, an extruding pipe die head, a pipe blank cooling heat-preserving section, a two-way drawing die, a vacuum cooling sizing device, a cooling box, a traction machine, a cutting machine and an automatic pipe discharge machine which are sequentially and linearly positioned to form a production line. The outer wall of a pipe blank is closely attached to the inner wall of the two-way drawing die to move, so that the two-way drawing die draws the pipe blank both in the radial direction and the axial direction. Radial drawing and axial drawing are completed through the two-way drawing die and the traction machine together. According to the method and device, the pipe is drawn through adsorption force of a vacuum machine and traction force of the traction machine, and radial orientation and axial orientation of the pipe are achieved. Besides, orientation is uniform, two-way performance of the oriented pipe can be greatly improved. Compared with common pipes, the tensile strength and the elasticity modulus of pipes in the same specification after biaxial orientation are improved by over 20%, the circular performance of the pipes is better than axial performance, and the actual use requirements of the oriented pipes are met.

Description

technical field [0001] The invention relates to the field of polymer molding and processing, in particular to a process and equipment for preparing biaxially oriented plastic pipes. Background technique [0002] The macromolecular chains of polymer materials will be arranged in an orderly manner under the action of a certain temperature and an external stress field, and an orientation structure will be obtained, so that the mechanical properties of the material in the orientation direction will be greatly improved, and the self-reinforcement of the material will be realized. Under the same outer diameter and pressure bearing capacity, the pipe wall of the oriented structure pipe is thinner, which effectively saves energy and raw materials. [0003] People have invented many manufacturing methods or equipment around the manufacture of biaxially oriented plastic pipes, such as mandrel mechanical expansion method, gas-liquid expansion method, inflatable bag expansion method, et...

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Problems solved by technology

[0003] People have invented many manufacturing methods or equipment around the manufacture of biaxially oriented plastic pipes, such as mandrel mechanical expansion method, gas-liquid expansion method, inflatable bag expansion method, etc., and the manufacture of these biaxially oriented plastic pipes In the method or equipment, a long mandrel mechanical expansion device with one end fixed on the extrusion die is placed inside the pipe, or one end is fixed on the extrusion die and the other end is fixed on a gas sealing plunger or a mechanical expansion device. These inventions are mostly two-step methods, first cooling the pipe to normal temperature and then heating it to the stretching temperature, making this type of method or equipment complicated, long production line, and occupying Large area, high production cost, high equipment investment, inconvenient operation, large energy consumption and high pipe waste rate

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