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In comparison to injection and blow molding, rotational molding can
easily produce both large, small precision and non-precision parts in a
cost effective manner from a tiny medical bulb to a 16 foot kayak and
up. Tooling for rotomolding is less expensive than injection molding
because the process does not require any pressure to be held and
rotomolding tooling is far less expensive than blow molding because
there's no internal core to manufacture. Since there is no internal
core, minor changes can be easily made to an existing mold, enabling
product enhancements and line extensions to be considerably less
expensive to develop and faster to bring to market. In addition,
Rotomolded parts are formed with heat and rotation, but not with
pressure. Therefore, molds don't need to withstand the high pressure of
injection molding.
Costs for product conversions from one material to another are
reduced because rotomolding permits the replacement of heavier, often
more costly materials with lighter, less expensive materials and does
not require extreme or expensive tooling changes to switch materials.
This advantage makes rotomolding as cost effective for one-of-a-kind
prototypes as it does for large production runs.
Rotomolding also offers significant design advantages in comparison
to injection molding and blow molding. With proper design and
engineering, parts that are assembled from several injection or blow
molded pieces can be molded as a single part, eliminating expensive
fabrication costs and streamlining the manufacturing process.
Rotomolding also has a number of inherent design strengths, such as
consistent wall thickness and strong corners that are virtually stress
free. If additional strength is required, reinforcing ribs can be
designed and molded into the part.
Inserts, threads, handles, undercuts, flat surfaces that eliminate
draft angles or fine surface detail are all designed in from the
beginning. Designers also have the option of multi-wall molding that can
be either hollow or foam filled. Sales and marketing teams always
appreciates the range of colors, permanent, molded-in logos and graphics
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