The welding ring outlet mold is mainly used to fix the tubular or sheet material which is still in the plasticized state after extrusion or injection, and is fixed in the molding die, and immediately introduces compressed air to force the material to expand and It is attached to the wall surface of the mold cavity, and is demolded after being cooled and shaped, that is, a processing method of the hollow product required. Suitable plastics for hollow molding are high pressure polyethylene, low pressure polyethylene, hard polyvinyl chloride, soft polyvinyl chloride, polystyrene, polypropylene, polycarbonate, and the like.
The welding ring outlet mold will be effectively divided according to the different molding methods of the parison. The hollow molding is mainly divided into two types: extrusion blow molding hollow molding and injection blow molding hollow molding. The advantage of the extrusion blow molding hollow molding is that the structure of the extruder and the extrusion blow mold is simple, and the disadvantage is that the wall thickness of the parison is inconsistent, and the wall thickness of the plastic product is likely to be uneven. The advantage of injection blow molding is that the parison has a uniform wall thickness and no flash. Since the injection parison has a bottom surface, the bottom of the hollow product does not have a seam and a seam, which is not only beautiful but also high in strength.
The welding ring exit mold die-casting mold is also called transfer molding mold. The plastic raw material is added to the preheating feeding chamber, and then the pressure is applied to the pressing column. The plastic is melted under high temperature and high pressure, and enters the cavity through the casting system of the mold, and is gradually hardened. This molding method is called die casting molding, and the mold used is used. Called die casting mold. This type of mold is mostly used for the molding of thermosetting plastics.