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绝大多数塑料成型加工工艺，在成型过程中，塑料及模具均处于相当高的压力(压强)之下，比如应用极为广泛的注塑、压缩模塑，挤出.吹塑等，因此应用这些成型工艺生产大型塑料制件时，不仅必须使用能够承受很大压力的模具，使模具变得笨重而复杂，而且塑料成型设备也必须设计、制造得十分牢固，机模的加工制造难度相应增大，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.
与此相反，由于滚塑成型工艺只要求机架的强度足以支承物料、模具及机架自身的重量，以及防止物料泄漏的闭模力，因此即使滚塑大型及特大型塑料制件，也无需使用十分笨重的设备与模具，机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