Rotomoulding: Advantages
- Roto-moulding commits itself to economy, design and production advantages.
- Low capital investment in machine and moulds.
- Since no pressure used, tooling cost low and moulds can be light weight.
- Inexpensive modifications of moulds at prototype stage possible.
- One piece seamless products with negligible scrape are produced.
- Double wall product configuration can be made.
- Complex outline with excellent surface definition is possible.
- A metal inserts / handles can be molded into the product.
- Identical or similar items, different sections or one part in different colours can be molded in a single arm simultaneously.
- Ability to achieve extremely uniform wall thickness: Compare this with blow moulding, where the molten material tends to stretch and become over-stressed at corners or sharp angles. So in a blow moulded part the corners may well be a point of weakness.
Rotomoulding, on the other hand, creates even wall thickness all over the part, even at corners.
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Rotomoulding: Design Advantages
- Rotational molding offers design advantages over other molding processes. With proper design, parts that are assembled from several pieces can be molded as one part, eliminating expensive fabrication costs.
- The roto moulding process has a number of inherent design strengths such as consistent wall thickness and strong outside corners that are virtually stressed free. Reinforcing ribs can be designed into the part, if additional strength is required.
- Rotational molding delivers the product the designer envisions. Designers can select the best material for their application, including materials that meet FDA requirements. Additives to help make the part weather resistant, flame retardant, or static free can be specified.
- Inserts, threads, handles, minor undercuts, flat surfaces that eliminate draft angles or fine surface detail can all be part of the design.
- Designers also have the option of multi-wall molding that can be either hollow or foam filled.
- Rotomoulding offers designers the benefit of recyclability. Mouldings tend to be in one thermoplastic polymer, enabling designers to plan for material recovery.
- Easy to make highly complicated shapes :
This is a really big advantage. Things like stiffening ribs, indentations, special areas, different textures are really no problem and will not ramp tooling costs through the roof.
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Rotomoulding: Cost Advantages
- Rotational molding has more cost advantage over other types of processes.
- In comparison to injection and blow molding, rotational molding can easily produce large and small parts in a cost effective manner.
- Production costs for product conversions are reduced because lightweight plastics replace heavier, often more costly materials. This makes rotational molding as cost effective for unique prototypes as it is for large production runs.
- Relatively economical tooling cost : In roto molding initial investment is very less. Rotomoulding is ideal if great idea for a product, but are not sure exactly how many will be able to sell. This is one of the reasons the roto moulding industry makes such a diverse range of exciting and innovative products. Tooling costs cheaper because in roto moulding usually no any pressure apply to the mould, so moulds cavities don't have to be carved out of massive blocks of metal. Since there is no internal core, minor changes can be easily made to an existing mold. And because parts are formed with heat and rotation, rather than pressure, molds don't need to be engineered to withstand the high pressure of injection molding.
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Other advantages of rotational molding
- Short lead-time
- Excellent load-bearing properties
- Ability to produce multi-wall moldings, which can be left hollow or foam-filled
- Economical for short production runs as well as high volume output
- Resins can be tailored to suit the application – e.g., to satisfy FDA requirements
- Minor undercuts are possible – without the need for draft angles
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