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How do bottle blow machine work? An explanation from a profession

Views: 2     Author: Site Editor     Publish Time: 2022-05-27      Origin: Site

A bottle blow machine is a kind of equipment that makes plastic pellets into hollow containers by a blow molding process. The more common models include hollow bottle blow machines that use PP and PE for one molding, and PET, PC, or PP for two moldings. Injection stretch bottle blow machine and the newly developed bottle blow machine with multi-layer hollow extrusion blow molding and stretch blow molding.

At present, most bottle blow machines are still two-step bottle blow machines. The plastic raw materials must be made into preforms and then blown. Nowadays, environmentally friendly plastics made of PET are commonly used.

The working principle of the bottle blow machine

The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin is heated to a softened state, placed in a split mold, and compressed air is introduced into the parison immediately after closing the mold to inflate the plastic parison and tighten it. It is attached to the inner wall of the mold, and after cooling and demoulding, various hollow products are obtained.

bottle blow machine

Classification of bottle blow machines

There are three types of bottle blow machines: extrusion bottle blow machines, injection bottle blow machines, and unique structure bottle blow machines.

The processing technology of the bottle blow machine

Nowadays, the processing technology of bottle blow machines is mainly divided into the one-step method and the two-step method.

One-step and two-step bottle blow machine molding process, mainly used for PET and BOPP hollow container molding. Both have their characteristics and are widely used. The two-step method is more suitable for the total production of preforms and dispersed bottles. In contrast, the one-step method is more suitable for the online production of beverage companies.

There are 6 main steps in the blowing procedure of the plastic bottle blowing machine:

1. First, put the heated preform into the mold;

2. Tighten the mold with the clamping cylinder;

3. lock the blank mold by using the high pressure or mechanical structure;

4. Pre-blowing the medium and high pressure when stretching the cylinder action to expand the blank mold;

5. High-pressure air blowing, the preform is shaped according to the mold, and the pressure is maintained for a specific time;

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

Pneumatic equipment is used in many places during the operation of the bottle blow machine; from discharging - locking - stretching - high pressure blowing /deflating - to taking bottles, this series of actions are all assisted by pneumatic equipment. The gas circuit is divided into the average pressure and the high-pressure part, such as stretching the high-pressure blowing and venting circuit.

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