What are the requirements for manufacturing chair molds?


  Basic information and requirements of chair moul […]


Basic information and requirements of chair mould

The steel material of the plastic chair mould is generally P20 or 45 steel. After forging, CNC milling rough machining, quenching and tempering to 28~30HRC (generally not nitriding), CNC milling finishing and other processing procedures. The plastic of the injection-molded chair is generally PP, and sometimes calcium carbonate (not more than 20%) is added to make the appearance of the product plump without a microcosm. PC (fully transparent) plastic is also used, but there may be a lot of bubbles due to poor exhaust and other reasons, but the cost is higher and the surface treatment of steel is different.

Plastic chair molds are generally cold runner large gates, ejected with a thimble, if it is taken out by a robot, the ejection is upwards, if it is automatically ejected, it is flipped downwards.

There are several special requirements for chair moulds:

1. The Huff line is better, not grinding your hands;

2. The exhaust effect should be good, otherwise the plastic products will have black spots, etc., and the serious ones will burn;

3. The stacking effect should be good. Stack 10 chairs vertically without tilting. When stacking, the distance between the two chair legs should not exceed 60mm, and it should be easy to separate after stacking;

4. The mold should be highly polished, because the chair is a daily necessities, so there should be no flashes, burrs, etc., to avoid scratching the skin.


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