How Do Drink Bottles Come Out?

Blowmolding process is a two-way stretching process, in the process, pet chain is two-way extension, orientation and arrangement, thereby increasing the mechanical properties of the bottle wall, improve the tensile, anti-tensile, anti-punch strength, and has a good air tightness. Although stretching helps to increase strength, but also can not overstretch, to control the stretch ingress ratio: radial not more than 3.5 to 4.2, axial not more than 2.8 to 3.1.

The wall thickness of the billet should not exceed 4.5mm. Blowing bottles are between the glass temperature and the crystallization temperature, generally controlled between 90 and 120 degrees. In this interval PET is represented as a high-bounce state, quickly blow molding, cooling shape ding-shaped after becoming transparent bottle.

In one-step method, this temperature is determined by the length of cooling time in the injection molding process (e.g. aoki bottle blower), so to bridge the relationship between the injection-blowing two-station. In the process of blowing plastic there are: stretch - one blow - second blow, three movements of the time is very short, but must cooperate well, especially the first two steps determine the overall distribution of materials, blowing bottle quality.

Therefore, to adjust well: stretch start timing, stretch speed, pre-blow start and end machine, pre-blowing pressure, pre-blowing flow, etc, if possible, it is best to control the overall temperature distribution of the billet, the temperature gradient of the outer wall of the billet. In the rapid blow molding and cooling process, there is induced stress in the wall of the bottle. For inflatable beverage bottles, it can resist internal pressure, good, but for hot filling bottles to ensure that above the glass temperature to let it fully release.