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rotational molding-Spencer-Rotational molding refers to a plastic manufacturing practice that creates hollow stress-free product lines. The procedure depends on high temperatures and bi axial rotation to come up with seamless, one piece objects that have varying shapes, colors and sizes. This technique is also called rotomoulding or rotocasting. Sometimes the term slush moulding is used for certain liquid vinyl styles.

The attribute that makes this different from other plastic manufacturing methods because no pressure is required. It also has few contenders when it comes down to the production of large size hollow products which are durable and inexpensive.There is a wide range of products that are created by this process including large size water tanks, automobile products, intricate shaped medical items, leisure equipment, toys, kayaks, commercial equipment among many others.This is due to the flexibility in regards to type and shapes that the process makes

Benefits of Using Rotomolding to Manufacture Plastic Products

  • Relatively low tooling costs.
    When compared to other plastic manufacturing processes in Spencer OH 44275, 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 rotational moulding 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-Spencer-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 Spencer 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 Process in Detail

This molding technique has been used since early times for creatingvseverl products. Egyptians for instance, used rotomoulding procedures in the producing of ceramics. The Swiss were also applying this rotation format to make hollow chocolate eggs. Some plastic products in the USA were made utilizing this method some time between 1940 and 1950. Because it was regarded to be a somewhat slow-moving procedure, the procedure has however taken long to become popular

1. Mould prep work.
A predetermined amount of polymer in particle form is loaded into a hollow mould. The mould is usually comprised of cast aluminium or sheet steel component. The coloration intended for the final goods 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 style of plastic engineering.

Pre-heating of the oven follows, and it can 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 secured and inserted into the oven.

2. The heating up and fusion phase.
Once within the oven, the mold is spun on two axis so the powdered polymer liquefies from the heat and overlays the inside if the mould. The rotation is done gradually, about 20 rotations per min. Something that is important at this point is the amount of time the mold will spend within the oven. If it stays to long, the component will lose value and strength, producing a faulty item. If it is removed from the oven too early, the polymer will not have flowed properly, which produces bubbles in the finalized product.

3. Mold cooling.
When the material has completely 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 generates a cool mist. When the product cools, it shrinks a little for ease of extraction from the mould. This is one more procedure that relies a lot on the right timing, since rapid cooling shrinks the material too fast, causing bending of the product.

4. The unloading or de-moulding step.
As soon as the component within te mould has cooled effectively, the molder taking care of the process can then extract the finished item from the mould. The function is repeated from the beginning, giving a series of identical product lines.

For more information on the different rotational molding options offered for the Spencer OH 44275, please call our toll free number  866-971-7861 or fill out the form on the right for a consultation!

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