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roto-molding-Norman-Rotational moulding refers to a plastic manufacturing procedure that makes hollow stress-free items. The technique depends on high temperatures and bi axial rotation to come up with seamless, one piece objects that have varying forms, colors and sizes. This procedure is also known as rotomoulding or rotocasting. Sometimes the term slush moulding is used for certain liquid vinyl types.

The benefit that makes this unique from other plastic manufacturing methods in that no pressure is called for. It also has few competitors when it comes down to the production of large hollow products which are durable and inexpensive.There is a wide range of product lines that are generated by this process including large size water tanks, automobile materials, complex molded medical items, leisure equipment, toys, kayaks, industrial equipment among many others.This is because of the flexibility in regards to type and shapes that the process develops

Benefits of Using Rotomolding to Manufacture Plastic Products

  • Relatively low tooling costs.
    When compared to other plastic manufacturing processes in Norman OK 73019, 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 Manufacturing-Norman-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 Oklahoma 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 Norman Oklahoma 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 Rotomoulding Method Components

This moulding technique has been used since ancient times for creatingvseverl products. Egyptians as an example, utilized rotocasting techniques in the producing of ceramics. The Swiss were also applying this rotation technique to generate hollow chocolate eggs. Some plastic products in the USA were made utilizing this technique some time between 1940 and 1950. Because it was thought of to be a rather slow-moving procedure, the technique has however taken long to become popular

1. Mold readying.
A predetermined amount of polymer in grain form is filled into a hollow mould. The mould is usually built from cast aluminium or sheet steel material. The color tone intended for the finished item is pre compounded into the polymer. The most generally used powder resin is polythene, but polyvinyl chloride and nylon can also be used in this type of plastic engineering.

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

2. The heat and fusion step.
Once within the oven, the mould is rotated on two axis so the powdered polymer liquefies from the heat and layers the inside if the mould. The spinning is done slowly, about 20 spins per minute. Something that is crucial at this point is the period of time the mold will spend within the oven. If it overstays, the component will lose value and strength, generating a poor item. If it is extracted from the oven too early, the polymer will not have melted properly, which creates bubbles in the finished product.

3. Mold cooling.
When the product has sufficiently spent the correct amount of time in the oven, it is then extracted for cooling. This can be done by air or water, or sometimes a mixture of both which generates a cool mist. When the component cools, it shrinks slightly for ease of extraction from the mold. This is an additional procedure that relies a lot on the ideal timing, since rapid cooling shrinks the material too fast, causing bending of the material.

4. The un-loading or de-molding step.
When the component inside te mold has cooled successfully, the molder managing the operation can then remove the finished product from the mold. The procedure is repeated from the beginning, giving a series of similar products.

For more information on the different rotational rotomolding options offered for the Norman OK 73019 area, please call our toll free number  866-971-7861 or fill out the form on the right for a consultation!

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