Method for improving mechanical properties of fusion seam of polymer injection articles and injection article die

Abstract

The invention supplies a method which is used to improve the mechanical property of the interfusion slot of the polymer injection component, and realize the injection component forming mould by the method. The main feature of The invention discloses that the supersonics emitted by the supersonic probe head in the prove head cavity on the outer wall of the polymer injection component forming mould is utilized to practice supersonic vibration to the interfusion slot of the injection component in the mould cavity, so that the improvement of the mechanical property of the interfusion slot of the polymer injection component is realized. The supersonic vibration can be applied at the beginning of the forming of the interfusion slot, also can after the mould cavity is filled with the melt. The frequency of the applied supersonics is from eighteen KHz to twenty five KHz, the power is from fifty W to three hundred W. Experimental result indicates that the supersonic vibration is applied to activate the movement of the polymer molecule and the molecule segment, accelerate the inter-diffusion of the molecule segment in the interfusion slot, so that the mechanical property of the interfusion slot of the polymer injection component is improved.

Description

1: Technical field [0001] The present invention relates to the field of polymer processing and, more particularly, the invention relates to the field of processing polymers by injection moulding. Two: background technology [0002] The fusion seam of polymer injection parts is formed after the flow fronts of two or more polymer melts meet in the mold. During the injection molding process of polymer products, fusion seams are easily formed. [0003] The fusion seam appears as a fusion line macroscopically, and it is a three-dimensional area different from the bulk material microscopically. The aggregated structure of this area is different from the bulk material, and the specific performance is: (1) vertical orientation. That is, the polymer molecular chains are oriented perpendicular to the direction of melt flow. (2) Weak connection. It is caused by the fact that the molecular chains of the polymer do not have time to form sufficient entanglement and diffusion during the...

AI Technical Summary

Problems solved by technology

(2) weak connection

The above-mentioned approaches (1) and (2) can improve the mechanical properties of fusion joints to a certain extent, but the degree of improvement is limited. Although approach (3) has a better effect in improving the mechanical strength of fusion joints, it has the cost of mold manufacturing. High, longer product molding cycle and other issues that cannot be ignored

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