A blow molding machine is a machine that can blow a good preform into a bottle by a certain process. At present, most of the blow molding machines use a two-step blow molding method, that is, preheating - blow molding.
First, preheat
The preform is irradiated by a high temperature lamp to soften and soften the body part of the preform. In order to maintain the shape of the bottle mouth, the preform opening does not need to be heated, so a certain cooling device is required to cool it.
Second, blow molding
In this stage, the preforms that have been preheated are placed in a mold that has already been prepared, and a high pressure is inflated therein to blow the preform into a desired bottle.
The blow molding process is a two-way stretching process in which the PET chain is bidirectionally extended, oriented and aligned, thereby increasing the mechanical properties of the bottle wall, improving the tensile, tensile, and impact strengths. Good air tightness. Although the stretching helps to increase the strength, it cannot be excessively stretched. The tensile inflation ratio should be controlled: the radial direction should not exceed 3.5 to 4.2, and the axial direction should not exceed 2.8 to 3.1. The wall thickness of the preform should not exceed 4.5 mm.
The 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, PET is in a high-elastic state, which is quickly blow molded, cooled and shaped to become a transparent bottle. In the one-step method, this temperature is determined by the length of the cooling process in the injection molding process (such as the Aoki bottle blowing machine), so it is necessary to connect the two injections.
In the blow molding process: stretching - one blowing - two blowing, the three movements are very short, but must be well matched, especially the first two steps determine the overall distribution of the material, the quality of the blowing. Therefore, it should be adjusted: stretching start timing, stretching speed, pre-blowing start and end timing, pre-blowing pressure, pre-blowing flow, etc. If possible, Zui can control the overall temperature distribution of the preform, bottle The temperature gradient of the inner and outer walls of the blank. In the process of rapid blow molding and cooling, induced stress is generated in the bottle wall. For a carbonated beverage bottle, it is resistant to internal pressure and is beneficial, but for hot-filled bottles it is necessary to ensure that it is fully released above the glass transition temperature.
Located in the Yangtze River Delta, Zhangjiagang Lanhai Machinery Co., Ltd. is a professional manufacturer of comprehensive beverage packaging machinery integrating research, development and manufacturing. The main products are: beverage filling machine, beverage filling equipment, can filling line, three Combined filling equipment, salt and soda filling machine, juice filling machine, large bucket water equipment, etc. The products have passed the ISO9001 quality management system certification, market customer satisfaction products, and the honor of the contract and trustworthy enterprise. The company adheres to the market-oriented, technology-first, quality is the business philosophy of life and service-oriented. Established a sound quality assurance system, the company is based on good faith.
The leading products of the company include pure water/mineral water production line, carbonated beverage production line, juice production line, 5 gallon drum series unit, 5L machine filling unit, PET bottle filling production line, beer flushing filling and sealing production line, labeling equipment and film wrapping machine. Equipment, water treatment, etc.
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