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rotational molding-Hopkins-Rotational moulding pertains to a plastic production procedure that produces hollow stress-free products. The method depends on high temperatures and bi axial rotation to follow up with seamless, one piece objects that have many different designs, colors and sizes. This procedure is also referred to as roto-molding or rotocasting. Sometimes the term slush molding is used for certain liquid vinyl styles.

The component that makes this different from other plastic manufacturing methods because no pressure is involved. It also has few contenders when it comes to the production of sizable hollow products which are long lasting and inexpensive.There is a variety of products that are generated by this process including large size water tanks, automobile products, intricate designed medical items, leisure equipment, toys, canoes, industrial equipment among many others.This is due to the versatility in terms of style and forms that the process creates

Benefits of Using Rotomolding to Manufacture Plastic Products

  • Relatively low tooling costs.
    When compared to other plastic manufacturing processes in Hopkins MI 49328, 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 roto-molding 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-Hopkins-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 Michigan 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 Hopkins Michigan 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 Roto-Molding Procedure in Detail

This moulding procedure has been used since early times for creatingvseverl items. Egyptians as an example, utilized rotocasting procedures in the of ceramics. The Swiss were also using this rotation format to create hollow chocolate eggs. Some plastic product lines in the USA were developed using this technique some time between 1940 and 1950. The technique has however taken very long to catch on because it was thought of as being a rather slow process

1. Mould prep work.
A predetermined volume of polymer in powder form is packed into a hollow mould. The mold is usually made from cast aluminium or sheet steel component. The color desired for the end goods is pre compounded into the polymer. The most typically used powder resin is polythene, but polyvinyl chloride and nylon can also be used in this design of plastic assembly.

Preheating of the oven follows, and it can be done by either conduction, convection or sometimes radiation. It is warmed to temperatures between 500-700F. The mould with the powdered polymer is then sealed and inserted within the oven.

2. The heating and fusion process.
Once inside the oven, the mold is revolved on two axis so the powdered polymer liquefies from the heat and layers the inside if the mold. The turning is done slowly, about 20 revolutions per minute. One thing that is critical at this moment is the amount of time the mold will spend inside the oven. If it overstays, the product will lose value and durability, producing a faulty item. If it is removed from the oven too early, the polymer will not have melted correctly, which creates bubbles in the finished product line.

3. Mould cooling.
When the product has completely spent the correct amount of time in the oven, it is then taken out for cooling. This can be done by air or water, or sometimes a mixture of both which creates a cool mist. When the component cools, it reduces somewhat for ease of extraction from the mold. This is another step that depends a lot on the correct timing, since rapid cooling decreases the material too quickly, causing warping of the material.

4. The discharging or de-molding step.
As soon as the material inside te mold has cooled properly, the molder handling the operation can then take out the finished product from the mould. The process is repeated from the beginning, supplying a number of identical product lines.

For more information on the different rotational molding options offered for the Hopkins MI 49328, please call our toll free number  866-971-7861 or fill out the form on the right for a consultation!

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