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Rotomolding Machine Plastic Molding Technology
- Aug 03, 2017 -

Rotomolding Machine Plastic molding technology

Rotational molding, also known as rotary molding or rotary molding, is a long history of plastic molding technology. It is reported that the core of the original process as rotational molding may begin with the manufacture of terracotta warriors in the Chinese Qin Dynasty. But as a plastic rotomoulding process from the United Kingdom, in 1887 the first rotomolding patent came out, 1934 to create the first commercial rotomoulding machine. 50 years in Europe have been great development, and later gradually into the United States, Japan and other places. It is just a supplement to the injection molding process. With the maturity of polyethylene powder technology, plastic molding process has increasingly become a very competitive molding method. Since then, rotomolding technology in the world continue to develop.

1. Foreign situation and development trend

   In recent years, in North America, developed countries in Europe, the rotational molding industry has developed rapidly, its development rate is higher than the average growth rate of the entire plastics industry. The development of the entire rotomolding industry is also relatively perfect, in addition to the rotomolding machine factory and rotomolding products production plant, there are a considerable number of other professional auxiliary plants, such as rotomoulding mold factory, release agent production plant, Paint production plants, milling machine manufacturers, insert manufacturers and suitable for rotomolding of the mixing plant manufacturers, there are a large number of rotomolding special raw materials supply plant and so on. Developed countries made rotomolding equipment more and more sophisticated, toward the level of automation and control the direction of continuous development.

  At present, with rotomolding equipment can not only produce simple structure, single-layer small products, but also the production of complex structure, multi-layer, large and large products, including all kinds of container products, motor vehicles and other motor vehicle accessories, military supplies, Ships, and human organs, and so on.

  Rotating machine from the heating point of view, the most commonly used only two categories, direct fire and hot box heating. Production of large-scale products with direct fire heating, that is, direct heating heating roll-forming machine; production of small and medium-sized products using hot box heating, the most common models are hot box heating roll-forming machine, hot box heating 2-arm shuttle roll Plastic machine, 3-4 arm tower-type rotational molding machine, hot box heating "mussel" type of plastic molding machine in recent years, rapid development. Developed countries in addition to continuous improvement of the rotational molding machine, but also to significantly improve the level of control of the molding machine. The system has been improved over time. The system includes two parts of temperature measurement and control display. The temperature measurement part is sealed in a thermal box which can be mounted on the mold frame, and the temperature inside the mold measured by the thermocouple is sent to the monitoring computer outside the hot box by radio. The computer displays the temperature / time curve in the mold. Compared with the temperature / time curve in the hot box, the curve can visually display the real-time condition of the mold and the heat transfer of the mold during the rotational heating process. Operators can use this optimization heating, cooling cycle, improve and ensure the quality of plastic products, so that the maximum strength of products, reduce production costs, but also more accurate evaluation of mold and new materials.