Extrusion blow moulding machine, also known as hollow blow moulding, is a rapidly developing plastic processing method. The tubular plastic billet produced by extrusion or injection moulding of thermoplastic resin is placed in the opposite open die while it is hot, and compressed air is injected into the billet immediately after closing the die, so that the plastic billet is blown up and attached to the inner wall of the die, and various hollow products are obtained by cooling and demoulding. The manufacturing process of blow-moulded film is very similar to that of hollow products in principle, but it does not use moulds. From the perspective of classification of plastic processing technology, the forming process of blow-moulded film is usually included in extrusion. During World War II, blow moulding began to be used in the production of low density polyethylene bottles. In the late 1950s, with the birth of high density polyethylene and the development of blow moulding machine, blow moulding technology has been widely used. The volume of hollow containers can reach thousands of litres, and some of the production has been controlled by computer. Plastics suitable for blow moulding are polyethylene, polyvinyl chloride, polypropylene, polyester, etc. The hollow containers obtained are widely used as industrial packaging containers. According to the method of parison making, blow moulding can be divided into extrusion blow moulding and injection blow moulding, and the newly developed multi-layer blow moulding and stretch blow moulding.

Energy saving utility

The energy saving of extrusion blow moulding machine can be divided into two parts: one is the power part and the other is the heating part.

Power part energy-saving: Most of the energy-saving way is to save the residual energy of the motor, such as the actual power of the motor is 50Hz, and you actually only need 30Hz to produce,

those excess energy consumption will be wasted, the frequency converter is to change the power output of the motor to achieve energy-saving effect. Energy-saving in heating part: The energy-saving in heating part is mostly energy-saving by electromagnetic heater, and the energy-saving rate is about 30% to 70% of the old resistance coil.