First of all, both rotomolding and blow molding processes can produce hollow products, but the blow molding of hollow products or tubular parisons without mold inflation into tube film is to use gas pressure to make hot parisons closed in the mold blowing Swelling, it is used in the manufacture of some packaging containers or tubular membrane. In which hollow blow molding materials are generally more polyethylene.

The rotational moulding (rotary moulding) method is a method similar to the rotary cast moulding, except that the material they use is not a liquid but a sinterable dry powder. The production process is also very simple. Put the dry powder into the mould and rotate it around two mutually perpendicular axes. Afterwards, the heat will uniformly melt on the inner wall of the mould. After cooling, the hollow can be taken out. Products. It uses plastics other than polyethylene and polyamides and cellulosics.

During the production of blow molding, there will be heads left by pulling and blowing the trachea, and the rotomoulding will leave a lot of burrs if it is not cut.