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Extrusion Blow Molding Machine

The "Magician" Behind Plastic Products

2025-07-18

Working Principle of Blow Molding Machine

The working principle of the blow molding machine is full of creativity. Taking the extrusion blow molding machine as an example, after the plastic raw materials are fed into the extruder, they gradually melt under the action of high temperature and become a melt with good fluidity. Subsequently, these melts are extruded to form a tubular parison. Immediately afterwards, the parison is quickly put into a closed blow mold. At this time, compressed air is injected into the parison like magic. Under the action of strong air pressure, the parison expands rapidly and fits tightly against the inner wall of the mold, as if endowed with a soul, accurately shaping the shape of the mold. After cooling and setting, a complete plastic product is freshly produced.

Classification of Blow Molding Machines

Extrusion Blow Molding Machine: The extrusion blow molding machine is the most common type of blow molding equipment, mainly used for producing hollow plastic products such as bottles, barrels, cans, etc. Its working principle is to melt the plastic and extrude it through a mold, then inflate and shape it with gas. The extrusion blow molding machine is suitable for producing hollow products of various sizes and shapes, and has the advantages of high production efficiency and simple operation.

Injection Blow Molding Machine: The injection blow molding machine combines injection molding and blow molding processes, and is suitable for producing high-precision and high-quality hollow products such as cosmetic bottles and medicine bottles. Its working principle is to first injection mold the plastic into a preform, and then inflate and shape it with gas. The injection blow molding machine has the characteristics of high molding precision and good product quality, but the equipment cost is relatively high.

Rotational Blow Molding Machine: The rotational blow molding machine is an efficient blow molding equipment, suitable for mass production of hollow products. Its working principle is to carry out continuous blow molding through rotating molds, which has the advantages of high production efficiency and high degree of automation. The rotational blow molding machine is suitable for producing hollow products such as bottles and barrels of various specifications, and is especially suitable for large-scale production in industries such as beverages and chemicals.

Application Fields of Blow Molding Machines

Packaging Industry: Blow molding machines are widely used in the packaging industry to produce various plastic bottles, barrels, cans and other packaging containers. Extrusion blow molding machines and rotational blow molding machines are the main equipment in the packaging industry, which can meet the packaging needs of different specifications and shapes.

Pharmaceutical Industry: The pharmaceutical industry has high requirements on the quality and precision of packaging containers, and the injection blow molding machine is an ideal choice for the pharmaceutical industry. Its high-precision and high-quality molding process can produce packaging containers that meet pharmaceutical standards, such as medicine bottles and reagent bottles.

Chemical Industry: The chemical industry needs a large number of hollow plastic products, such as chemical barrels and storage tanks. Rotational blow molding machines and extrusion blow molding machines can meet the large-scale production needs of the chemical industry, with the advantages of high production efficiency and good product quality.

Automotive Industry: In the automotive industry, automotive interior parts, fuel tanks, water tanks, etc. are also processed by blow molding machines.

Daily Necessities Field: Plastic toys and household items are even more full of traces of blow molding machines.

Energy - saving Technology of Blow Molding Machine

The energy saving of blow molding machine can be divided into two parts: one is the power part, and the other is the heating part.

Power Part Energy Saving: Most of them use frequency converters. The energy - saving method is to save the residual energy consumption of the motor. For example, the actual power of the motor is 50Hz, but in production, only 30Hz is actually enough for production. The excess energy consumption is wasted in vain. The frequency converter can change the power output of the motor to achieve the effect of energy saving.

Heating Part Energy Saving: Most of the energy saving in the heating part adopts electromagnetic heaters for energy saving, and the energy saving rate is about 30% - 70% of that of the old resistance rings. Compared with resistance heating, the electromagnetic heater has an additional layer of insulation, which increases the heat energy utilization rate; the electromagnetic heater directly acts on the material pipe for heating, reducing the heat loss in heat transfer; the heating speed of the electromagnetic heater is more than a quarter faster, reducing the heating time; the fast heating speed of the electromagnetic heater improves the production efficiency, keeps the motor in a saturated state, and reduces the electric energy loss caused by high power and low demand.

Development Trend of Blow Molding Machine

With the continuous progress of science and technology, blow molding machines are also constantly upgrading. In the future, it will develop towards intelligence, high efficiency and energy saving. The intelligent blow molding machine will be equipped with advanced sensors and control systems, which can monitor various parameters in the production process in real time and make automatic adjustments according to the actual situation, so as to improve production efficiency and product quality. The high - efficiency blow molding machine will adopt more advanced technologies and designs to improve production speed and capacity. The energy - saving blow molding machine will further reduce energy consumption and reduce the impact on the environment.

As an important equipment in the plastic processing industry, the blow molding machine plays an indispensable role in our life. It not only brings us a variety of practical plastic products, but also promotes the development of related industries. It is believed that in the future, with the continuous innovation and progress of technology, the blow molding machine will continue to play its important role and add more convenience and color to our life.

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