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rotational molding-Homer-Rotational moulding pertains to a plastic manufacturing method that generates hollow stress-free products. The method relies upon high temperatures and bi axial rotation to come up with seamless, one piece objects that have various forms, colors and sizes. This technique is also called roto-molding or rotocasting. Sometimes the term slush molding is used for certain liquid vinyl types.

The component that makes this different from other plastic manufacturing methods that no pressure is called for. It also has few competitors when it comes down to the creation of large hollow products which are resilient and inexpensive.There is a variety of product lines that are developed by this process including large water tanks, automobile materials, complex molded medical products, leisure equipment, toys, kayaks, industrial equipment among many others.This is because of the flexibility in regards to design and forms that the process manufactures

Benefits of Using Rotomolding to Manufacture Plastic Products

  • Relatively low tooling costs.
    When compared to other plastic manufacturing processes in Homer OH 43027, it is a cheaper way of making plastics. This is because apart from the fact that no pressure is required, the cost of mold preparation is low.
  • A wide array of design options.
    There is no limit to the kind of design one may want to create. The rotomolding process therefore allows for the manufacturing of products that have complex shapes for different purposes.
  • Size.
    The process provides room for the manufacturing of products of any size, large or small. As mentioned earlier, it has few competitors when it comes to the making of large tanks at low costs.
  • Low risk.
    Due to the low costs of creating a mould, the process allows for test runs before one can decide whether to do mass production. It therefore minimizes the risk of losing a lot of investment.
  • Durable products.
    The process allows for even coating of the mould with the heated polymer, giving the product a wall with uniform thickness. It also gives the option of double coating for increased durability. Sometimes metal inserts are placed inside the mould to further strengthen the product.
  • Environmentally friendly.
    There is no waste that could have a negative impact on the environment because the products that cannot be used are reground and reused as polymer.

Examples of Products Made by Rotational Molding

Plastic Molding-Homer-Rotocasting is a very versatile process, making it possible to create a variety of products for different industries.

  • Agricultural industry– From cattle feeders, water troughs, spray tanks etc.
  • Automotive industry– Filler tubes, dash boards, arm rests, sun visors, air conditioner duct work etc.
  • Furniture– We have plastic cabinets, chairs and tables made from this form of moulding.

There are numerous Ohio plastic products also that have been made for the marine industry, lighting, waste storage and transportation, kayaks etc.

Few Disadvantages – There are nominal disadvantages that have been associated with rotocasting. For instance:

  • – The process is relatively slow when compared to injection moulding.
  • – There is a limitation when it comes to the type of raw material you can use. Only poly based and nylon polymers can be used.
  • – The process comes with an increased cost because the polymer has to be ground to powder form before use.
    These limitations are often overlooked considering that the process is still relatively cheap and offers more in terms of variety when it comes to the finished range of products.

Remember – There are new developments and discoveries that are being made as the world of plastic manufacturing in Homer Ohio continuously. For instance, tests are being done to see whether there are other materials that can be used for this process. But so far, rotomoulding offers a good option for the production of a wide range of inexpensive plastic products.

The Rotomolding Procedure in Detail

This moulding technique has been used since ancient times for creatingvseverl products. Egyptians for example, worked with rotocasting procedures in the creating of ceramics. The Swiss were also working with this rotation style to create hollow chocolate eggs. Some plastic products in the USA were created using this approach some time between 1940 and 1950. Considering that it was thought of to be a relatively slow method, the process has however taken long to become popular

1. Mould readying.
A fixed volume of polymer in grain form is filled into a hollow mold. The mould is usually composeded of cast aluminium or sheet steel material. The color tone wanted for the final item is pre compounded into the polymer. The most often used powder resin is polythene, but polyvinyl chloride and nylon can also be used in this format of plastic assembly.

Preheating of the oven starts, and it may be done by either conduction, convection or sometimes radiation. It is heated up to temperatures between 500-700F. The mold with the powdered polymer is then locked and installed inside the oven.

2. The heat and fusion step.
Once within the oven, the mold is turned on two axis so the powdered polymer liquefies from the heat and coats the inside if the mould. The turning is done slowly and gradually, about 20 rotations per sixty seconds. The main thing that is important at this moment is the period of time the mould will spend inside the oven. If it overstays, the product will lose stability and durability, creating a poor product. If it is removed from the oven too early, the polymer will not have melted properly, which generates bubbles in the completed product line.

3. Mold cooling down.
When the component has sufficiently spent the right amount of time in the oven, it is then removed for cooling. This can be done by air or water, or sometimes a mixture of both which creates a cool mist. When the material cools, it reduces somewhat for ease of removal from the mold. This is yet another measure that depends a lot on the correct timing, since quick cooling decreases the material too quick, causing bending of the product.

4. The offloading or de-molding phase.
When the material inside te mould has cooled effectively, the molder handling the process can then take out the completed product from the mould. The procedure is repeated from the beginning, making a number of identical product lines.

For more information on the different rotational molding options offered for the Homer OH 43027, please call our toll free number  866-971-7861 or fill out the form on the right for a consultation!

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