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

rotational molding-Willmar-Rotational molding pertains to a plastic production solution that creates hollow stress-free items. The process relies on high temperatures and bi axial rotation to follow up with seamless, one piece products that have several 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 feature that makes this unique from other plastic manufacturing techniques in that no pressure is involved. It also has few contenders when it involves the creation of sizable hollow products which are long lasting and inexpensive.There is a wide range of items that are created by this process including big water tanks, automobile materials, sophisticated designed medical items, recreation equipment, toys, canoes, commercial equipment among many others.This is because of the flexibility in regards to type 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 Willmar MN 56201, 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 rotocasting 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-Willmar-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 Willmar 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 Rotomoulding Procedure in Detail

This molding operation has been used since early times for creatingvseverl products. Egyptians for example, utilized rotocasting systems in the manufacturing of ceramics. The Swiss were also making use of this rotation type to generate hollow chocolate eggs. Some plastic products in the USA were developed utilizing this method some time between 1940 and 1950. The procedure has however taken long to catch on because it was considered to be a somewhat slow process

1. Mold prep work.
A fixed quantity of polymer in grain form is packed into a hollow mould. The mold is usually made of cast aluminium or sheet steel material. The color tone chosen 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 format of plastic manufacturing.

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

2. The heat and fusion procedure.
Once inside the oven, the mould is spun on two axis so the powdered polymer melts from the heat and layers the inside if the mold. The rotation is done slowly and gradually, about 20 rotations per sixty seconds. The main thing 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 durability, producing a weak item. If it is extracted from the oven too early, the polymer will not have liquefied properly, which generates bubbles in the finished item.

3. Mold cooling down.
When the material has sufficiently spent the right amount of time in the oven, it is then taken out for cooling. This may be done by air or water, or sometimes a mixture of both which generates a cool mist. When the component cools, it reduces somewhat for ease of removal from the mould. This is an additional step that depends upon a lot on the correct timing, since quick cooling decreases the material too rapidly, causing bending of the material.

4. The unloading or de-molding phase.
When the product inside te mould has cooled successfully, the person handling the procedure can then take out the completed item from the mold. The procedure is repeated from the start, supplying a series of exact items.

For more information on the different rotational rotomolding options offered for the Willmar MN 56201 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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