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絕大多數塑料成型加工工藝，在成型過程中，塑料及模具均處于相當高的壓力(壓強)之下，比如應用極為廣泛的注塑、壓縮模塑，擠出.吹塑等，因此應用這些成型工藝生產大型塑料制件時，不僅必須使用能夠承受很大壓力的模具，使模具變得笨重而復雜，而且塑料成型設備也必須設計、制造得十分牢固，機模的加工制造難度相應增大，成本增加。
Most of the plastic molding process, in the process of forming, plastic and mould are at a relatively high pressure (pressure), such as widely used as injection molding, compression molding, extrusion blow molding and so on. Therefore, the application of these large plastic parts production process, not only must be used to mold under great pressure, the bulky and complex mould, and plastic molding equipment design, manufacturing must be very strong, processing and manufacturing machine die difficulty increases, increase the cost of.
與此相反，由于滾塑成型工藝只要求機架的強度足以支承物料、模具及機架自身的重量，以及防止物料泄漏的閉模力，因此即使滾塑大型及特大型塑料制件，也無需使用十分笨重的設備與模具，機模的加工制造十分方便，制造周期短、成本低。
On the contrary, the rotational moulding process only requires frame strength enough to support materials, mold frame and its weight, and to prevent leakage of material clamping force, so even if the rotational large plastic parts, no need to use cumbersome equipment and mould processing, mold manufacturing machine is very convenient, the manufacturing cycle short, low cost