Rotational moulding, also sometimes known as rotomoulding, is a thermoplastic fabrication process by which plastic goods are formed and manufactured using a revolving mold and high heat. Rotomolded products are hollow and have single piece construction, with uniform wall thickness and high tensile strength. They are often inexpensive to manufacture and require little further fabrication work.
 
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MOD is a design and manufacturing specialist in the conversion of metal, fiberglass, wood and other parts into complete, integrated, rotational molding plastic designs. Award-winning MOD engineers help you cut the parts, count, reduce weight, boost strength and add stunning visual appeal. We create products for applications such as chemical, food, healthcare and more.
We are a full-service rotational molding manufacturer that takes pride in our state-of-the-art equipment and our long-term employees. We are noted for our custom ability, but have our own standard product line as well. Why buy anything but Quality? Stop in and we are confident that you will agree, Quality is not just our name, it is our business. Call us today or visit our website for a quote!
Roto Dynamics, custom rotational molders serving rotomolding needs nationwide. Our team is dedicated to our customers' rotational molding requirements; we do not manufacture our own plastic products. Long term customer relationships assist us in developing a competitive advantage. We produce quality parts at competitive prices; offer stocking options, secondary ops assemblies and short lead times.
Assmann Corporation is an NSF & ISO certified rotational molder of large and small double wall, vertical, horizontal and conical plastic tanks, and also chemical feed stations plus secondary containment basins. Our rotomolding process and extensive experience makes the difference... We offer many accessories, including full drain outlet, seismic restraints and more.
Stern Industries offers you the unique advantage of rotational molding in conjunction with various other capabilities to meet your every requirement. High quality custom rotationally molded parts are achieved in even the most complex shapes and configurations. In addition to quality products, Stern Industries' innovative purchasing model minimizes cost and maximizes profitability and productivity.
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There are many other advantages to the rotational molding process. While being heated and rotated, the plastic resin adheres to the hot mold, coating it very evenly and seamlessly, producing strong outside corners with virtually no stresses. Rotomolding can produce one-piece constructions, and complex parts are formed without any part assembly required. The plastics used for rotomolds are often lightweight and may be high or low in density. For applications in the food and beverage and pharmaceutical industries, the thermoplastics used can be easily fabricated to be FDA approved, meaning they must not contain any recycled plastic or dies and cannot contaminate substances under any conditions, even high temperatures. The low cost of the materials and tooling makes rotational molding just as cost effective for producing prototypes as it is for large production runs. A variety of finishes, colors and textures are available. Companies are able to mold their logo, graphic or labels right into the parts. These imprints will not come off and are parts of the mold construction. Rotomolding is a versatile molding technique that provides durability to products, eliminates costly fabrication and assembly processes and reduces the need for replacement parts.
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- A common process used to form hollow, thermoplastic shapes, such
as bottles and containers. Two general types of blow molding are extrusion
and injection blow molding.
- The
process in which individual polymer particles are joined together by a
molecular bond.
- The ability
of a material to withstand various chemical agents. Plastic is capable
of enduring many of these chemicals, making it very useful for holding
tanks and other containers.
- The oxidation and
deformation of a material, such as the rusting of iron, due to a chemical
reaction.
- The time it takes
from the first stage of rotational molding, in which the plastic is loaded,
until the plastic completes its final stage and is removed from the mold.
- The removal of
unwanted material from a molded product, especially from the areas where
parting lines of the mold may have caused excess material to be formed.
- A significant parameter
for polyethylene (PE) that affects the properties, such as stiffness and
impact strength, of the end product.
- The ability of
a material to return to its original form after stress has been applied
and quickly removed.
- The temperature
at which the plastic resin melts and begins to adhere to the surface of
the mold.
- The ability
of a plastic to be ground into a fine powder. Most plastics are ground
prior to being loaded into the mold.
- The measure
of the ability of a plastic to withstand fracture by shock.
- A generic name for
semi-synthetic or synthetic materials that can be extruded or molded into
films or objects. Plastic materials are also used for coatings and adhesives.
- A chain of molecules
that is formed by the bonding of individual repeating units (monomers).
- The measure of
the speed of a plastic powder when poured through a funnel. For a plastic
powder to be acceptable for rotomolding, it must be capable of flowing
at least 185 grams/minute.
- Any of various semisolid
or solid natural organic materials that are usually translucent or transparent.
Resins are mostly utilized in plastics, adhesives and coatings.
- The "arms"
of the rotational molding machine that are responsible for moving the
molds between different stages. Spindles also spin on the horizontal and
vertical axes to create a uniform filling within the mold.
- The ability
of a resin to withstand specified temperatures. Less thermally stable
materials can be rotomolded only under controlled conditions with extreme
care.
- A material that
will soften when repeatedly heated and cooled. Examples of thermoplastics
include polyethylenes, polypropylene (PP), vinyl and nylons.
