How does PP Hollow Grid Board Production Line Turn Plastic Pellets into Hollow Grid Board?

PP hollow grid board production line is an integrated manufacturing system that converts polypropylene pellets into three-dimensional grid structure boards through melt extrusion and compression molding technology. Its core technology is to realize the continuous operation of raw material plasticization, structural molding and cut-to-length cutting.

Polypropylene pellets are transported to the high-temperature barrel by a vacuum feeder, and the solid particles are converted into a homogeneous molten state through the synergistic effect of the shear heat of the rotating screw and the external heater. The melt enters the mold distributor after removing impurities through a multi-stage filter to ensure the stability of material flow.

The specially designed co-extrusion die diverts the molten polypropylene to the multi-layer flow channel, and the upper and lower surface melts merge with the longitudinally arranged support ribs at the mold cavity outlet. The sizing sleeve and vacuum adsorption device immediately perform three-dimensional shaping on the extruded sheet, forming regularly arranged rectangular cavities inside the sheet, and a continuous closed surface on the surface.

The solidified sheet enters the traction roller device and is pulled out at a uniform speed, and the anti-slip pattern is synchronously pressed by the double-sided embossing roller. The flying saw cutting system implements fixed-length cutting based on the photoelectric detection signal, and the stacking robot completes the automatic stacking of the finished products. The scraps are recycled by the crusher and then put back into the mixing system to achieve closed-loop material utilization.

How to ensure the stability of the cavity structure of the PP hollow grid board production line?

The cooling water ring system of the PP hollow grid board production line implements gradient cooling on the initially formed sheet material, so that the surface layer solidifies first to form a rigid shell, and the internal ribs maintain geometric accuracy under controlled shrinkage to avoid structural deformation.