Classification of extrusion blow molding machines

The hollow blow molding machine can be divided into continuous extrusion hollow blow molding machine and intermittent extrusion hollow blow molding machine according to the different discharging methods.

1. Continuous extrusion hollow blow molding machine

That is, the tube blank is continuously extruded by the extruder. Its advantages are: simple molding equipment, less investment, and easy operation. It is the basic molding method commonly used by small and medium-sized enterprises in China. There are three kinds of production processes of continuous extrusion blow molding method: reciprocating type, rotating discharge type and turntable type.

Reciprocating continuous extrusion hollow blow molding machine, the parison is continuously extruded by the extruder, when the parison is long enough, the blow mold moves from the blow molding and cooling work to the lower part of the machine head to clamp the parison, and then move back. Back to blow molding station. The continuity of the production process is ensured by the reciprocating motion of the two molds located on the left and right under the machine head.

Rotational discharge type continuous extrusion hollow blow molding machine, a reversing valve is used at the front end of the extruder to control the flow of the melt, so that the melt alternately extrudes the parison through the parison head on both sides of the extruder to achieve continuous Production.

Turntable continuous extrusion hollow blow molding machine, the extruder continuously extrudes the parison, after the parison is clamped by the mold, it is transferred around the axis of the turntable to the stations such as inflation, cooling, mold opening and product removal to realize the continuous process. . Blow moulds can also be set on a horizontal turntable.

2. Intermittent extrusion hollow blow molding machine

That is, the extruder continuously extrudes the melted and plasticized melt into a storage cavity, and when the material in the storage cavity reaches the required amount, the material in the storage cavity is quickly pushed.