Blow molding principle of solar container battery shell

How does a blow molding process work?

The blow molding process begins with softening plastic by heating a preform or parison. The parison is a tube-like piece of plastic with a hole in one end through which compressed air can enter. The plastic workpiece is then clamped into a mold and air is blown into it. The air pressure inflates the plastic which conforms to the mold.

Why do blow molding machines need a fast cooling system?

The compressed air used to blow and form the container remains inside it, during the entire blowing phase, quickly reaching a high temperature. The need for a fast cooling system in blow molding machines is determined by the fact that the degree gap between outside and inside causes stress to the material.

What is injection blow molding?

The injection blow molding process uses injection molding rather than extrusion to produce the precursor; it is generally known as a preform rather than a parison. The injection blow molding machine has an integral injection unit and a multi-impression mold assembly in which the mold cores are mounted on a rotary table.

What are some examples of injection blow molded components?

The best known examples of injection blow molded components are clear polyethylene terephthalate (PET) bottles used for carbonated drinks. In contrast to extrusion blow molding, injection blow molding is a cyclic noncontinuous process. Injection blow molding can be split into three distinct phases that create an injection blow molded component: 1.

What is a blow molding machine?

This is the least-used of the three blow molding processes, and is typically used to make small medical and single serve bottles. The process is divided into three steps: injection, blowing and ejection. The injection blow molding machine is based on an extruder barrel and screw assembly which melts the polymer.

How do injection molds work?

While the preform is still hot and plastic, the injection mold is opened and the preforms, still on the core pins, are rotated to station 2, the blowing station. Here the preforms are enclosed within the blow mold, and the molding is produced by introducing blowing air through the core pins.