Is The Rotational Molding Process Suitable For All Plastics?
The rotational molding process produced by rotational molding manufacturers is also called rotational molding, rotational molding, rotary molding, etc. It is a hollow molding method for thermoplastic plastics. Rotational molding process is an important branch in plastic molding processing. From small children's toys to automobile plastic parts to huge engineering plastic products. Especially for large and special-shaped hollow products, due to the limitations of the characteristics of traditional processes, they can only be completed by rotational molding.
Common rotational molding raw materials on the market include the following: polyethylene (PE); polypropylene (PP); nylon (PA); polyvinyl chloride (PVC); polycarbonate.
The problem is, not all of the plastics mentioned above can be used for rotational molding. Rotational molding requires specially designed materials. Basic requirements include: easy grinding. Using high-performance normal temperature grinding mills and low-temperature grinding mills, we can already process commonly used rotational molding raw materials such as polyethylene and polypropylene, and the cost is also continuously reduced.
Proper liquidity. Taking commonly used polyethylene raw materials as an example, the melt index (MI, or MFI) range of a brand should generally be between 2 and 0 (g/0 min). The optimized melt index range is 3-6 (g/0 min). ). If the melt index is too low, the product will be difficult to form. If the melt index is too high, the physical properties of the product will decrease.
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Save raw materials. The wall thickness of rotational molding products is relatively uniform and the chamfers are slightly thicker, so the performance of the material can be fully utilized and it is conducive to saving raw materials; in addition, during the rotational molding process, there are no waste materials such as runners and gates. Once debugged, , there is almost no recycled material during the production process, so this process has extremely high utilization rate of materials.