Polypropylene corrugated pipe sizing die and corrugated pipe forming machine head containing the sizing die

Abstract

The invention relates to a polypropylene corrugated pipe sizing die, wherein N long grooves parallel to a central axis of the corrugated pipe sizing die are sectioned; the length of the long grooves is 50-100mm, the width between two adjacent long grooves is 3-30mm, and the distance between the long grooves and the installation end surface of the corrugated pipe sizing die is equal to the inner diameter of the corrugated pipe sizing die x (0.5-1.5). The corrugated pipe forming machine head containing the sizing die further comprises a machine head die body, a vacuum box, a mouth die, a core die and a cooling device; the corrugated pipe sizing die is arranged in the vacuum box, the mouth die is arranged at the inlet end of the vacuum box, the core die is arranged at the center of the mouthdie; a corrugated pipe blank passage is reserved between the core die and the mouth die; the cooling device comprises an internal water cooling pipe arranged in a core die pipe hole and an external spray head on the inner wall of the vacuum box. The sizing die is scientific in design and simple in structure, the corrugated pipe produced by the corrugated pipe forming machine head containing the sizing die has low cost and high efficiency without pollution; the shaping cooling speed of the corrugated pipe is fast, and the impact toughness and the impact strength are high.

Description

technical field [0001] The invention relates to a plastic mechanical equipment part, in particular to a polypropylene corrugated pipe sizing die for improving the impact strength of the polypropylene corrugated pipe and a bellows forming machine head containing the sizing die. Background technique [0002] Polypropylene (PP) is a general-purpose plastic with excellent comprehensive properties and is widely used. Poor toughness, especially easy to become brittle at low temperature, thus limiting its further utilization and development. [0003] In order to improve the deficiencies in PP performance, there are two commonly used methods: [0004] 1. The toughening modification of elastomers has the advantages of greatly improving the impact toughness of the matrix resin, but at the same time it inevitably reduces the rigidity and strength of the matrix material; [0005] 2. The advantage of modifying the β crystal nucleating agent is that it can improve the impact resistanc...

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Problems solved by technology

[0005] 2. The advantage of modifying the β crystal nucleating agent is that it can improve the impact resistance of the product without reducing or even increasing the heat distortion temperature of the product, so that the two contradictory aspects of impact resistance and heat deformation resistance can be taken into account. However, when using The effect of PP recycled materials or PP slightly compounded with other plastics is not obvious;

[0006] In addition, the above methods have greatly increased the cost

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