Zhejiang Anji Tianyang Rotational Mouding Machinery Co.,Ltd

High quality product, professional service, being the core supplier in laser industry!

Home > News > Content
Rotomolding Machine Rotary Molding
- Sep 08, 2017 -

Rotomolding Machine Rotary molding

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 originated in 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, the rotomolding process continues to develop around the world

1. Foreign situation and development trend

In recent years, in North America, developed countries in Europe, rotomotor industry 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 complete, in addition to the rotational molding 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 manufacturers, milling machine factory, insert factory and suitable for rotomolding of the mixing equipment factory, there are a large number of rotomolding special raw materials supply plant and so on. Developed countries manufacturing rotomolding equipment is also 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 a variety of container products, motor vehicles and other motor vehicle accessories, military supplies, Ships, and human organs, and so on.

From the rotational molding machine 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 heated rocking 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. Here should be a special introduction to the 1991 Northern Ireland Rotational Molding Systems and Canada Exxon Chemical Company to develop a successful Rotolog rotational molding process diagnostic system. The system has been improved by a few improvements. The system includes two parts of temperature measurement and control display. The temperature measurement part is sealed in a heat-insulating 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. The curve is compared with the temperature / time curve in the hot box, which 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 products to maximize the strength and reduce production costs, but also more accurate evaluation of mold and new materials.