Looking for rotational molding alternatives for Minnesota? Want affordable custom plastic molding that is cost effective for Sauk Rapids area? Then give us a call at our toll free number 866-971-7861 or request a quote today!

rotocasting-Sauk Rapids-Rotational molding pertains to a plastic production procedure that creates hollow stress-free product lines. The process relies on high temperatures and bi axial rotation to follow up with seamless, one piece products that have a variety of designs, colors and sizes. This method is also known as rotomoulding or rotocasting. Sometimes the term slush moulding is used for certain liquid vinyl forms.

The attribute that makes this different from other plastic manufacturing procedures that no pressure is involved. It also has few contenders when it comes to the production of large hollow items which are durable and inexpensive.There is a wide range of items that are developed by this process including large water tanks, automobile materials, complex shaped medical products, leisure equipment, toys, canoes, industrialized equipment among many others.This is because of the flexibility in terms of type and forms that the process manufactures

Benefits of Using Rotomolding to Manufacture Plastic Products

  • Relatively low tooling costs.
    When compared to other plastic manufacturing processes in Sauk Rapids MN 56379, 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

Custom Molded-Sauk Rapids-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 Sauk Rapids 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 Rotomolding Method in Detail

This moulding process has been used since earlier times for creatingvseverl items. Egyptians for example, utilized rotocasting systems in the making of ceramics. The Swiss were also making use of this rotation design to make hollow chocolate eggs. Some plastic product lines in the USA were manufactured using this procedure some time between 1940 and 1950. The system has however taken very long to catch on because it was considered as being a somewhat slow process

1. Mold readying.
A fixed measure of polymer in particle form is packed into a hollow mold. The mould is usually built from cast aluminium or sheet steel component. The coloration desired for the end item is pre compounded into the polymer. The most often used powder resin is polythene, but polyvinyl chloride and nylon can also be used in this style of plastic production.

Preheating of the oven follows, 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 sealed and positioned into the oven.

2. The heating up and fusion phase.
Once placed into the oven, the mould is turned on two axis so the powdered polymer melts from the heat and coats the inside if the mould. The rotation is done gradually, about 20 revolutions per sixty seconds. Something that is crucial at this moment is the period of time the mould will spend within the oven. If it stays to long, the component will lose stability and strength, generating a weak item. If it is removed from the oven prematurely, the polymer will not have flowed correctly, which develops bubbles in the finished product.

3. Mold cooling down.
When the material 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 a cool mist. When the component cools, it reduces slightly for ease of removal from the mold. This is yet another step that relies a lot on the ideal timing, since rapid cooling decreases the material too rapidly, causing warping of the material.

4. The offloading or de-molding step.
When the material within te mould has cooled successfully, the person managing the operation can then take out the completed item from the mold. The procedure is repeated from the start, supplying a series of identical items.

For more information on the different rotational rotomolding options offered for the Sauk Rapids MN 56379 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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