Rotational Plastic Molding

Rotational plastic molding, likewise called rotomolding or rotocast, is a thermoplastic procedure for making hollow parts by placing powder or fluid resin right into a hollow mold and then revolving that device bi-axially in a oven until the resin melts and coats the inside of the mold cavity. Next the tool is cooled down as well as the component is eliminated from the mold.

The Four Stages of the Process

plastic rotomolding1. Load the mold with a polymer material

2. Heat up device in oven to melt product

3. Cool tools to strengthen the component

4. Eliminate part from the tools

Rotational Plastic Molding Advantages

Rotational molding differs from other processing techniques during that the heating, melting, shaping, and cooling down
stages all take place after the polymer is placed in the mould, therefore no external stress is applied during the production

It offers benefits like:

  • Financially viable made large products
  • Minimum layout restraints
  • Stress-free products
  • No polymer weld lines
  • Relatively low mould costs

The Plastic Molding Process

The rotational molding process is basically split right into 4 procedures:

rrotomolding plastic mixingStarting Set-Up
A pre-determined amount of polymer powder is placed in the mold. With the powder filled, the mould is shut, locked as well as loaded into the stove. The powder can be pre-compounded to the preferred colour.

Heating & Fusion
When inside the oven, the mould is turned around two axis, rolling the powder– the process is not a centrifugal one. As the mould comes to be hotter the powder starts to stick and melt to the inner walls of the mould. As the powder melts, it slowly develops up an even coating over the whole area.

Cooling Down
After the melt has actually has reached the desired degree, the mold is cooled down either by air, water or a mix of both. The polymer solidifies to the desired form.

When the polymer has actually cooled down sufficiently to maintain its shape and can be quickly managed, the mould is opened up and the item removed. After this, the powder can again be placed in the cycle as well as the mold duplicated.


Examples of Plastic Products Produced

  • rotomolded plastic productsRain storage tanks
  • Slides as well as climbing up frames
  • Fuel and water storage tanks
  • Kids play houses
  • Cone traffic shapes
  • Kayaks and canoes
  • Pallets
  • Containers

Layout & Manufacturing Alternatives

Rotational shaped components can be constructed for numerous kinds of products and can have multi-layered walls. Also
inserts and rotate weld accessories can be implemented in the component that include a range of accessory options.
Unusual shapes could be created as one part, that usually would need to be put together from several places.

Our in-house design & engineering department can assist your project team through the specified steps of making a rotational molded component. Rotational molding can create tiny to huge, simple to complicated pieces. Furthermore mold setting up, additional procedures, as well as custom product packaging are offered

Project Development

Our Engineering and Design team will also work with you on your task requirements
Your job specifications are drawn with CAD software to make a 3-D version
We can import an existing CAD drawing you already have.
A beginning prototype can be made from a 3D design model
After the pattern satisfies your authorization the mold is made.

Manufacturing Options

  • Components color matched to your specifications (PMS or provided example).
  • Area coating and structure.
  • Wall surface thickness suggestion.
  • Product packaging & Shipping.
  • Product Recommendations consisting of.
  • Polyethylene.
  • Cross-Linked Polyethylene.
  • Polypropylene.
  • and also others.
  • Tooling Recommendations.
  • Cast Aluminum.
  • CNC Machined Aluminum.
  • Produced Steel, Stainless Steel and Aluminum.

For more information on rotational plastic molding, please call us at 812-526-2655 or contact us at R & R Technologies LLC 7560 East County Line Road, Edinburgh, IN 46124

How it Works