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rotomolding-Minneapolis-Rotational moulding pertains to a plastic production solution that creates hollow stress-free product lines. The technique uses high temperatures and bi axial rotation to follow up with seamless, one piece items that have a wide range of designs, colors and sizes. This method is also called rotomolding or rotocasting. Sometimes the term slush molding is used for certain liquid vinyl types.

The benefit that makes this unique from other plastic manufacturing techniques in that no pressure is called for. It also has few contenders when it pertains to the production of large hollow items which are resilient and inexpensive.There is a wide variety of products that are created by this process including big water tanks, automobile items, intricate molded medical products, recreation equipment, toys, kayaks, industrial equipment among many others.This is due to the versatility in regards to design and shapes that the process creates

Benefits of Using Rotomolding to Manufacture Plastic Products

  • Relatively low tooling costs.
    When compared to other plastic manufacturing processes in Minneapolis MN 55401, 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 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 Manufacturing-Minneapolis-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 Minnesota 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 Minneapolis Minnesota 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 molding operation has been used since earlier times for creatingvseverl products. Egyptians for instance, employed roto-molding solutions in the creating of ceramics. The Swiss were also using this rotation method to make hollow chocolate eggs. Some plastic items in the USA were created using this technique some time between 1940 and 1950. The process has however taken very long to catch on because it was considered as being a very slow-moving process

1. Mold readying.
A fixed volume of polymer in particle form is filled into a hollow mould. The mold is usually made of cast aluminium or sheet steel component. The coloring preferred for the final 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 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 mould with the powdered polymer is then locked and inserted into the oven.

2. The heat and fusion phase.
Once placed into the oven, the mold is revolved on two axis so the powdered polymer liquefies from the heat and layers the inside if the mould. The turning is done slowly and gradually, about 20 revolutions per min. Something that is vital at this point is the amount of time the mold will spend within the oven. If it stays to long, the product will lose value and strength, producing a faulty item. If it is removed from the oven prematurely, the polymer will not have melted correctly, which creates bubbles in the finished product.

3. Mold cooling down.
When the product has sufficiently 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 shrinks a little for ease of removal from the mold. This is an additional measure that depends upon a lot on the ideal timing, since rapid cooling shrinks the material too quickly, causing warping of the material.

4. The unloading or de-moulding phase.
When the material within te mold has cooled correctly, the person handling the procedure can then extract the finished item from the mould. The procedure is repeated from the start, making a series of identical items.

For more information on the different rotational rotomolding options offered for the Minneapolis MN 55401 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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