Plastic labor protection cap shell mould

Injection molding core technology of helmet shell

1, PC material, PC/ABS, PC/PBT alloy plastic, ABS plastic must be fully dry before injection, with dehumidification dryer or vacuum dryer drying, need to measure its moisture content, to ensure the consistency of plastic drying quality and drying effect, prevent injection plastic parts impact strength decline,  Avoid appearance quality (silver lines, gas lines, etc.) problems.  

2. Choose an injection molding machine of the appropriate size and tonnage (about 350T), not too large to prevent the melt from staying in the cylinder for a long time, resulting in plastic decomposition and affecting the appearance quality and impact strength of the helmet.  

Quality control requirements for helmet housings

1. The surface quality and color of the injection parts should be OK to prevent shrinkage, silver lines (flower), gas lines, water ripples, flow lines and product deformation on the surface, and prevent overflow (front) and lack of glue around the helmet shell.  

2. It is suggested to use weighing method to control the quality of helmet shell.  

3. The impact strength of the helmet shell should be strictly controlled (the helmet should be tested for impact strength), which should meet the national standard -- the helmet shell can not be penetrated in the free fall at a height of 1 meter with a 3 kg medium hammer with a 60 degree perforator at the front and head;  When the initial 30N force is gradually increased to 630N, the deformation is not more than 40mm, and when the 30N force is restored, the deformation is not more than 15mm with the initial size.  When goggles are broken, fragments with an acute Angle of less than 60 degrees shall not appear (glass fiber reinforced plastic, carbon fiber composite plastic injection molded helmet shell has the best impact strength, but the material is expensive and the cost is relatively high).  

4, helmet protection pad, buffer belt and other auxiliary functional parts of the strength should also meet the impact protection requirements.