The defects and solutions of PVC pipe fittings production appear

With the continuous development of China’s construction industry, the market demand for hard PVC pipe and its fittings is increasing. Many township enterprises have been on the hard PVC injection moulding production line. But due to the weak technical force, the production of poor product quality, high scrap rate, seriously affect the efficiency of the enterprise. This paper puts forward the common problems and solutions of PVC pipe fittings.

Revanus

Revanus: Also called shrinking marks, that is, the surface of the product is concave and the edges are smooth. The main reason is that the material contraction is caused by no compensation.

Solution:

(1) Select raw materials with a small contraction rate in the production process for production;
(2) Improve injection molding pressure, increase the pressure preservation pressure in the later period, reduce the corresponding injection rate of the shrinking part, reduce the temperature of the mold, and reduce the injection temperature;
(3) Change the position of the mold of the mold, shorten the mouth, increase, increase, and widen, reduce the flow resistance
force;
(4) PVC technology and talent exchange

Silver pattern

Silver pattern: refers to the silver -white streamlined phenomenon that appears in the direction of the material flow of the product. The main reason is that there is moisture or raw material decomposition in the raw materials.

Solution:

(1) The temperature of the mixture should be appropriate. Generally, the mixing temperature is about 115 ° C, and the cold mix is ​​45 ° C to make the raw materials fully dry;
(2) Reduce the injection temperature and reduce the retention time of the melt in the tube. PVC technology and talent exchange.

Trimming

Trimming: It refers to the part of the product that is different from white during the production process. Including black spots, black lines, red patterns, blue patterns, etc.

Solution:

(1) Select good quality stabilizers, lubricants and proper compatibility;
(2) Reduce the injection temperature and reduce the stay time of the material in the tube;
(3) Clean up the screws and tube of the injection molding machine to make the machineless material and other phenomena;
(4) Increase the pouring port of the mold, and the inner dough -to -round corner to shorten the molding cycle to prevent material retention and decomposition.

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