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rotational molding-Sawyer-Rotational moulding refers to a plastic production method that creates hollow stress-free products. The technique depends on high temperatures and bi axial rotation to come up with seamless, one piece objects that have several forms, colors and sizes. This technique is also known as rotomolding or rotocasting. Sometimes the term slush moulding is used for certain liquid vinyl types.

The function that makes this different from other plastic manufacturing procedures because no pressure is required. It also has few contenders when it involves the production of large hollow products which are long-lasting and inexpensive.There is a variety of products that are developed by this process including large size water tanks, automobile items, intricate molded medical products, recreation equipment, toys, kayaks, commercial 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 Sawyer MI 49125, 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 rotomoulding 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-Sawyer-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 Sawyer 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 Process in Detail

This moulding system has been used since earlier times for creatingvseverl products. Egyptians for example, applied rotomoulding systems in the producing of ceramics. The Swiss were also utilizing this rotation format to generate hollow chocolate eggs. Some plastic product lines in the USA were made utilizing this procedure some time between 1940 and 1950. Considering that it was viewed to be a rather slow system, the process has however taken long to catch on

1. Mould fitting.
A fixed amount of polymer in grain form is packed into a hollow mould. The mold is usually crafted from cast aluminium or sheet steel component. The color tone preferred for the end goods is pre compounded into the polymer. The most commonly used powder resin is polythene, but polyvinyl chloride and nylon can also be used in this style of plastic engineering.

Preheating of the oven starts, 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 locked and placed into the oven.

2. The heat and fusion step.
Once within the oven, the mould is revolved on two axis so the powdered polymer melts from the heat and coats the inside if the mould. The turning is done slowly and gradually, about 20 spins per min. The main thing that is critical at this moment is the amount of time the mold will spend inside the oven. If it stays to long, the material will lose value and durability, creating a weak item. If it is taken out from the oven prematurely, the polymer will not have melted correctly, which develops bubbles in the finished product line.

3. Mold cooling down.
When the component has completely spent the enough of time in the oven, it is then extracted for cooling. This may 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 mold. This is another measure that depends upon a lot on the right timing, since rapid cooling decreases the material too rapidly, causing warping of the material.

4. The discharging or de-molding step.
When the material inside te mold has cooled effectively, the molder managing the process can then remove the completed product from the mould. The technique is repeated from the start, making a number of exact products.

For more information on the different rotational molding options offered for the Sawyer MI 49125, please call our toll free number  866-971-7861 or fill out the form on the right for a consultation!

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