Plastic tank rotomolding products although great progress has been made but compared with injection molding, extrusion molding still exist many deficiencies, and roll forming and there are still many areas in need of improvement. The development direction of rotational molding mainly focus on the following points:
(1) with resin raw materials to develop a new type of plastic products: Although polyethylene for rotational molding processing for many years, but in the strength and stiffness of some products can not meet the demand, and some engineering plastics have been used as rolling grip processing, but due to cost and other technical problems and failed to spread, it is necessary to develop new materials.
(2) control strengthening processing conditions: because the mold does not stop the rotation, it is difficult to directly monitor to resin powder and melt in the mold condition. Before the general is the method of experience and trial and error to optimize processing conditions. At present, foreign scholars invented into the camera and light source and the infrared device in rotational molding mold to monitor the resin in the mold internal melting and forming condition and temperature changes.
(3) to strengthen the application of computer simulation technique: heating using computer technology to the mold is simulated, the corresponding mathematical model is built, then the process parameters of the precision control automation technology. This can increase the rotational molding products mechanical properties and dimensional accuracy, improve product competitiveness of rotational molding products.
(4) die structure optimization design, speed up the heat conduction, shorten the processing cycle: due to the heating and cooling of the die is carried out in the exterior of the mold, plastic products in the heating and cooling time are long. Recently, scholars began to study the heating inside the mold processing cycle can shorten the rotational molding products.
(5) improve the rotational molding products and the automation level of the degree of precision: Modern rotational molding equipment automation level compared with the injection molding gap is still large, if the processing cycle and improve the level of automation equipment will roll Viper products can from a few minutes to 1 minutes, then it with other processing methods will greatly enhance the competitiveness.