Machining process knowledge of PVC pipe fittings

Machining process knowledge of PVC pipe fittings
1, plastic at room temperature for 24 hours after the water absorption of less than 0.02%, and therefore do not need to dry. If necessary, dry, can be put into the hot air furnace 60-70 3 hours, or 80 degrees Celsius boring machine 1-1.5 hours. Recovery of the material can be up to 20% with the new material mixture, the amount of material to be recovered after the final use of the finished product. Indiscriminate use of recovered materials can be injection molding defeat, not only to recover the ingredients too much, more reason is because the material after repeated reprocessing. Recover more than one quality to recover the more the more.
2, injection molding machine selection of UPVC pipe fittings, because the melt viscosity is big, easy to differentiation, the differentiation of products on the iron corrosion effect, its injection molding is necessary for the special plastic parts and temperature control system.
3, mold and gate planning mold temperature can be set to 40. The runner's length is shorter, the diameter is bigger, so as to reduce the pressure loss and the holding pressure can be transferred to the mold cavity. The gate as short as possible, to die section circular nozzle and the diameter of the smallest 6mm, into a 5 degree angle cone. The die surface of the stem flow channel should also be circular, which is combined with cold material well, which can be connected with the stem flow channel and the gate with the diameter of 7mm. The shape of the gate using tangential radius of convergence of plastic parts, the shorter the better, die section to smooth.

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