As a commonly used plastic processing machine, the hollow blow molding machine is very important to control the processing process of the hollow blow molding machine. Temperature control is an important control factor in the production process of hollow blow molding machines.

Classification and characteristics of hollow molding

1. Extrusion blow molding

The extrusion blow molding process includes: ①The composition of the tube blank: it is extruded by the extruder and hangs in the pre-separated cavity installed directly under the machine head; ②When the sagging parison reaches the qualified length, immediately Clamp the mold, and block the parison by the incision of the mold; ③Insert the compressed air blowing pipe from the small hole on the parting surface of the mold and send the compressed air to make the parison inflate and close to the mold wall and form; ④Insist on the air pressure to make The product can be demolded after cooling and shaping in the cavity.

2. Injection blow molding

The composition of injection-blow-molded parison is to mold the parison on a metal tube by means of injection molding. One end of the tube is fed with compressed air, and the tube wall at the other end is provided with micro-holes. The injection-molded parison is usually taken out after cooling, reheated to above Tg before blowing, quickly moved into the mold, and blown in with compressed air.

3. Stretch blow molding

Before the parison blowing, between Tg and Tf, the parison is axially stretched by mechanical means, and then in the blow molding, the parison radial dimension is increased, and then the parison is stretched horizontally, and then rapidly cooled to Tg The following molding.

4. Multilayer blow molding

It is compounded with multi-layer tube blanks, and inflated and cooled under the same conditions.