A manufacturer specializing in the production of PET blow molding machines and molds5
The working principle of the bottle blowing machine: The blowing process of the bottle blowing machine is divided into two parts. 1. Preheating irradiates the preform (embryo) through the infrared high-temperature lamp to irradiate the bad (embryo) body part of the preform (embryo) It is heated and softened to maintain the shape of the bottle mouth. The preform (embroid) mouth never needs to be heated, so a certain cooling device is required to cool it. 2. Blow molding This stage is to place the preheated preform (embroid) into the ready blow mold, and perform high-pressure inflation inside it. Blow and pull the preform (embryo) into the required bottle. The automatic bottle blowing machine combines the two operations of bottle blowing through the operation of the manipulator, eliminating the need for the natural process of putting the preheated preform into the blowing mold. Significantly accelerate the rate of production. The process flow of the bottle blowing machine: The blowing process of the bottle blowing machine is a one-way stretching process. During this process, the PET chain is unidirectionally extended, oriented and arranged, thereby increasing the mechanical properties of the bottle wall and improving Tensile, tensile, impact strength, and have very good air tightness. Although stretching helps to increase the strength, it must not be excessively stretched. It is necessary to control the stretch inflation higher than: the radial direction exceeds 3.5 to 4.2, and the axial direction exceeds 2.8 to 3.1. The wall thickness of the preform is more than 4.5mm. Blowing is carried out between the glass transition temperature and the crystallization temperature, and is generally controlled between 90 and 120 degrees. In this interval, the PET exhibits a highly elastic state, and becomes a transparent bottle after rapid blow molding, cooling and setting. In the one-step method, the temperature is determined by the length of the cooling time during the injection molding process (such as the Aoki blow molding machine), so the relationship between the injection and blowing stations must be connected. The blow molding process includes: stretch-blow once-blow twice. The time of the three actions is very short, but some kind of action must be well coordinated, especially the latter two steps determine the overall distribution of the material and the quality of the blowing . Therefore, it is necessary to adjust: stretching start timing, stretching speed, pre-blowing start and end timing, pre-blowing pressure, pre-blowing flow, etc., for example, if possible, it is best to control the overall temperature distribution of the preform, bottle The temperature gradient of the inner and outer walls of the blank. During the rapid blowing and cooling process, induced stress is generated in the bottle wall. For gas-filled beverage bottles, it can resist internal pressure, which is beneficial, but for hot-filled bottles, it is necessary to ensure that the glass transition temperature exceeds to allow it to be fully released. Preform → heating → transfer tray into mold → stretch pre-blowing → bottle blowing → exhaust → finished bottle 1. Preform: it is provided after injection by the injection machine. 2. Heating: heating the preform through the lamp tube, divided into 14 heating zones. 9 lamps in each heating zone (the number of lamps used is set according to the highest point of the preform). The first 7 heating zones are penetration furnaces, and the last 7 are distributed furnaces. 3. The turntable is fed into the mold: the mold temperature is generally about 65°C, and the mold temperature is heated by the water temperature machine to about 65°C and sent to the mold to heat the mold. 4. Stretching and pre-blowing: In addition to the two steps of stretching and pre-blowing, the stretching mainly depends on the stretching rod to stretch the preform to a certain extent. Pre-blowing is the pre-blowing of the preform through a low pressure of 8-13 bar. 6. Bottle blowing: blow into bottles through 36-40bar high pressure. 7. Exhaust: Exhaust high-pressure air from the mold.
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