Graphical analysis of the operation principle of the bottle blowing machine

Operation principle of bottle blowing machine

Bottle blowing machines are mainly divided into three categories: extrusion blow molding machines, injection blow molding machines and special structure blow molding machines. The processing technology is mainly divided into one-step method and two-step method. One-step and two-step blow molding machine molding process, mainly used for PET and BOPP hollow container molding. Both have their own characteristics and are widely used. In comparison, the two-step method is more suitable for centralized production of preforms and dispersed blown bottles; and the one-step method is more suitable for online production of beverage companies.

The blowing procedure of the blow molding machine mainly has 6 steps:

1. First put the heated plastic blank into the mold;

2. Use the clamping cylinder to tighten the mold;

3. Use high pressure or mechanical structure to make the blank mold Locking;

4. Pre-blow at medium and high pressures, and simultaneously stretch the cylinder to expand the preform;

5. Blow at high pressure, the preforms are shaped according to the mold and kept under pressure for a certain period of time;

6. Release the high pressure in the formed bottle, the cylinder Reset-take the bottle.

Pneumatic equipment is used in many places during the operation of the bottle blowing machine; from discharging-locking-stretching-high-pressure blowing / deflating-taking the bottle, this series of actions are assisted by pneumatic equipment.

As shown in Figure 2, we can see that the air circuit is divided into two parts, the normal pressure part and the high pressure part.