The blowing principle and process flow of Jinyi mechanical blow molding
machine At present, most blow molding machines are still two-step blow molding machines, that is, it is necessary to first make plastic raw materials into preforms and then blow them. Nowadays, it is usually commonly used. It is environmentally friendly plastic made of PET. 1. Blowing principle The blowing process of the bottle blowing machine
is divided into two parts: 1. Preheat the preform (embryo) through the infrared high-temperature lamp to irradiate the bad (embryo) body of the preform (embryo) to some heating and softening, in order to Adhere to the shape of the bottle mouth, the preform (embroid) mouth does not need to be heated, so a certain cooling device is required to cool it. 2. Blow molding machine blow molding. During this period, the preheated preform (embryo) is placed in the blow mold that is now ready, and the interior is inflated with high pressure. 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 center to manually put the preheated bottle blank into the blowing mold. Greatly accelerate the rate of production. 2. The process flow of the bottle blowing machine The blowing process of the bottle blowing machine is a two-way stretch process. In this process, the PET chain is bidirectionally extended, oriented and placed, thereby increasing the mechanical properties of the bottle wall and improving the stretch Stretching, tensile, impact strength, and excellent air tightness. Although stretching helps to improve the strength, it should not be overstretched. It is necessary to control the stretch-inflation ratio: do not exceed 3.5-4.2 in the radial direction, and do not exceed 2.8-3.1 in the axial direction. The wall thickness of the preform should not exceed 4.5mm. Blowing is carried out between the glass transition temperature and the crystallization temperature, usually between 90 and 120 degrees. In this interval, the PET exhibits a highly elastic state, which becomes a transparent bottle after rapid blowing and cooling. In the one-step method, this temperature is determined by the length of the cooling time in the injection molding process (such as the Aoki bottle blowing machine), so it is necessary to connect the injection-blowing two stations. The blow molding process includes: stretching-blowing once-blowing twice. The three actions have a very short time, but they must be well coordinated, especially the first two steps determine the overall distribution of the material and the quality of the blown bottle. Therefore, it is necessary to adjust: stretching start opportunity, stretching speed, pre-blowing start and end opportunities, pre-blowing pressure, pre-blowing flow, etc. It is best to control the overall temperature distribution of the preform, and the temperature gradient of the inner and outer walls of the preform. .
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