Safety Helmet Mould

1. The surface appearance quality and color of injection molded parts must be OK to prevent shrinkage, silver lines (material flowers), air marks, water ripples, flow lines and product deformation and other undesirable defects on the surface. Overflow (Pi Feng) is prohibited around the helmet shell. ) and lack of glue.

3. The key point is to strictly control the impact strength of the helmet shell (the helmet needs to undergo an impact strength test), and it must meet the national standards - use a 3 kg weight with a 60-degree perforator on the front head to drop freely from a height of 1 meter. The helmet shell cannot be penetrated; when the initial force of 30N gradually increases to 630N, the deformation shall not exceed 40mm; when the force of 30N is restored, the deformation shall not exceed 15mm from the initial size; when the goggles are broken, there shall be no acute angle less than 60 degrees. fragments (the impact strength of helmet shells made of injection molded glass fiber reinforced plastics and carbon fiber composite plastics is the best, but the materials are expensive and the cost is relatively high).