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

rotomoulding-Mankato-Rotational molding pertains to a plastic manufacturing procedure that produces hollow stress-free items. The method utilizes high temperatures and bi axial rotation to come up with seamless, one piece items that have various forms, sizes and colors. This method is also called rotomolding or rotocasting. Sometimes the term slush moulding is used for certain liquid vinyl types.

The feature that makes this different from other plastic manufacturing procedures that no pressure is called for. It also has few rivals when it involves the manufacture of large size hollow items which are resilient and inexpensive.There is a wide variety of items that are developed by this process including big water tanks, automobile products, intricate designed medical items, leisure equipment, toys, canoes, industrialized equipment among many others.This is due to the flexibility in terms of design and forms that the process produces

Benefits of Using Rotomolding to Manufacture Plastic Products

  • Relatively low tooling costs.
    When compared to other plastic manufacturing processes in Mankato MN 56001, 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

Custom Molded-Mankato-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 Mankato 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 Procedure in Detail

This moulding technique has been used since early times for creatingvseverl items. Egyptians for example, used rotational molding solutions in the making of ceramics. The Swiss were also using this rotation approach to generate hollow chocolate eggs. Some plastic products in the USA were created utilizing this approach some time between 1940 and 1950. The system has however taken long to catch on because it was considered to be a moderately slow-moving process

1. Mold preparation.
A predetermined measure of polymer in particle form is packed into a hollow mould. The mold is usually made of cast aluminium or sheet steel material. The color chosen for the finished goods 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 assembly.

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 secured and placed within the oven.

2. The heat and fusion procedure.
Once within the oven, the mold is spun on two axis so the powdered polymer liquefies from the heat and overlays the inside if the mold. The turning is done slowly, about 20 rotations per minute. Something that is crucial at this moment is the amount of time the mould will spend within the oven. If it overstays, the material will lose value and strength, producing a poor product. If it is taken out from the oven too early, the polymer will not have liquefied correctly, which develops bubbles in the finalized item.

3. Mold cooling.
When the component has sufficiently spent the enough of time in the oven, it is then removed for cooling. This may 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 extraction from the mould. This is another step that depends upon a lot on the correct timing, since rapid cooling shrinks the material too fast, causing warping of the item.

4. The un-loading or de-molding phase.
Once the material within te mold has cooled adequately, the person managing the procedure can then take out the completed product from the mould. The function is repeated from the start, making a number of similar items.

For more information on the different rotational rotomolding options offered for the Mankato MN 56001 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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