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April 18, 2022
Introduction and energy-saving effects of blow molding machines
Introduction to Blow Molding
Blow moulding, also known as blow moulding, is a rapidly developing plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin is placed in a split mold while it is hot (or heated to a softened state), and compressed air is introduced into the parison immediately after closing the mold to blow the plastic parison. It expands and sticks closely to the inner wall of the mold, and after cooling and demoulding, various hollow products are obtained. The manufacturing process of blown film is very similar in principle to blow molding of hollow products, but it does not use a mold. From the perspective of plastic processing technology classification, the molding process of blown film is usually included in extrusion. The blow molding process began to be used to produce low density polyethylene vials during World War II. In the late 1950s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology was widely used. The volume of hollow containers can reach thousands of liters, and some production has adopted computer control. Plastics suitable for blow molding include polyethylene, polyvinyl chloride, polypropylene, polyester, etc., and the obtained hollow containers are widely used as industrial packaging containers.
According to the method of making the parison, blow molding can be divided into extrusion blow molding and injection blow molding. The newly developed ones include multi-layer blow molding and stretch blow molding.
The energy saving of the blow molding machine can be divided into two parts: one is the power part and the other is the heating part.
Energy saving in the power part: most of them use frequency converters. The energy saving method is to save the excess energy consumption of the motor. For example, the actual power of the motor is 50Hz, and you actually only need 30Hz in production. Wasted, the frequency converter is to change the power output of the motor to achieve the effect of energy saving.
Energy saving in the heating part: Most of the energy saving in the heating part is the use of electromagnetic heaters to save energy, and the energy saving rate is about 30%-70% of the old-fashioned resistance coil.
1. Compared with resistance heating, the electromagnetic heater has an additional layer of insulation layer, which increases the utilization rate of heat energy.
2. Compared with resistance heating, the electromagnetic heater directly acts on the heating of the material tube, which reduces the heat loss of heat transfer.
3. Compared with resistance heating, the heating speed of the electromagnetic heater is more than a quarter faster, which reduces the heating time.
4. Compared with resistance heating, the heating speed of the electromagnetic heater is fast, the production efficiency is improved, and the motor is in a saturated state, which reduces the power loss caused by high power and low demand.
The above four points are the reasons why Feiru electromagnetic heater can save energy as high as 30%-70% on the blow molding machine.