Plastic Injection Chair Frame: Molding, Cooling & Assembly

The video shows the complete process of plastic chair frame production at MSDA's injection workshop, from raw material molding to component assembly. Large injection molding machines form the back shells and structural parts through clamping and injection; right after demolding, the still-hot parts go into a water bath for cooling, a step that locks in shape accuracy and dimensional stability. The cooled parts move to manual stations, where workers trim flash and burrs from the ribbed components and connector interfaces, and check each part for completeness. In the final stage, armrest frames are positioned and fastened on dedicated jigs to ensure left-right symmetry and consistent hole alignment. Qualified frame parts proceed to the assembly line to be combined with upholstery and hardware into finished chairs.