Blowing setting process of automatic bottle blowing machine

Bottle blowing machine refers to the equipment for blowing bottles. The simple explanation is that this machine can blow plastic particles (softened into liquid) or good preforms into the bottle through technical means.
At present, most bottle blowing machines are still two-step, that is to say, plastic raw materials must be made into preforms before bottle blowing. At present, pet environmentally friendly plastics are widely used.
Blowing principle
The blowing step of the bottle blowing machine is divided into two parts.
Warm up
Irradiate the preform (embryo) with an infrared high-temperature lamp to heat and soften the embryo. In order to maintain the shape of the bottle mouth, the embryo mouth does not need to be heated, so a certain cooling device is needed to cool it.
Blow molding
This stage is to put the preformed preform into the completed blow mold and inflate it with high pressure. Blow and pull the preform (embryo) into the desired bottle.
The automatic bottle blowing machine combines the two operations of bottle blowing through the operation of the manipulator, avoiding the process of manually putting the preheated bottle blank into the bottle blowing mold. It greatly accelerates the production speed.
The process of the bottle blowing machine
The blowing process of the bottle blowing machine is a two-way stretching process. In this process, the pet chain is bidirectionally extended and arranged in orientation, which improves the mechanical properties of the bottle wall, improves the tensile, tensile and impact strength, and has good air tightness. Although stretching helps increase strength, it should not be overstretched. Control the ratio of stretching and blowing times: no more than 3.5-4.2 times in the radial direction and no more than 2.8-3.1 times in the axial direction. The embryo wall thickness shall not exceed 4.3mm.
Blowing is carried out between the glass transition temperature and the crystallization temperature, generally controlled between 90 and 110 degrees. Within this range, pets exhibit a highly elastic state. After rapid blow molding and cooling, the pet becomes a transparent bottle.
In the blow molding process, there are three actions: stretching, primary blow molding and secondary blow molding. The time of the three actions is very short, but they must be coordinated, especially the first two steps determine the overall fabric and quality of the bottle blowing. Therefore, it is necessary to set the start time, stretching speed, start and end time, pre-inflation pressure, pre-inflation flow and other parameters of the pre-inflation. If possible, it is best to control the overall temperature distribution and internal embryo The temperature gradient of the outer wall.
During the rapid blowing and cooling process, there is induced stress on the bottle wall. For gas-filled beverage bottles, it can resist internal pressure, which is beneficial, but for hot-filled bottles, it must be ensured that it is completely released above the glass transition temperature.