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rotomoulding-Mackinac Island-Rotational moulding refers to a plastic production technique that produces hollow stress-free product lines. The method relies upon high temperatures and bi axial rotation to follow up with seamless, one piece items that have several designs, sizes and colors. This technique is also referred to as rotomolding or rotocasting. Sometimes the term slush molding is used for certain liquid vinyl styles.

The attribute that makes this different from other plastic manufacturing procedures because no pressure is needed. It also has few rivals when it comes to the production of large hollow products which are durable and inexpensive.There is a variety of items that are created by this process including large size water tanks, automobile materials, sophisticated shaped medical items, leisure equipment, toys, kayaks, industrial equipment among many others.This is due to 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 Mackinac Island MI 49757, 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

Plastic Manufacturing-Mackinac Island-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 Mackinac Island 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 Rotomolding Process Components

This moulding operation has been used since earlier times for creatingvseverl product lines. Egyptians as an example, employed rotomoulding procedures in the creating of ceramics. The Swiss were also employing this rotation style to make hollow chocolate eggs. Some plastic product lines in the USA were developed using this method some time between 1940 and 1950. The system has however taken long to take affect because it was thought of to be a somewhat slow-moving process

1. Mould preparation.
A fixed quantity of polymer in powder form is packed into a hollow mould. The mould is usually comprised of cast aluminium or sheet steel material. The colour needed for the end 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 engineering.

Preheating of the oven starts, and it can 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 placed inside the oven.

2. The heat and fusion phase.
Once within the oven, the mould is revolved on two axis so the powdered polymer liquefies from the heat and coats the inside if the mold. The rotation is done slowly, about 20 rotations per minute. The main thing that is critical at this moment is the amount of time the mold will spend within the oven. If it overstays, the product will lose stability and durability, making a poor product. If it is extracted from the oven prematurely, the polymer will not have liquefied properly, which produces bubbles in the completed product line.

3. Mold cooling.
When the component has sufficiently spent the correct amount of time in the oven, it is then extracted for cooling. This can be done by air or water, or sometimes a mixture of both which creates a cool mist. When the material cools, it shrinks slightly for ease of extraction from the mold. This is yet another step that relies a lot on the ideal timing, since rapid cooling reduces the material too quick, causing bending of the material.

4. The offloading or de-molding step.
Once the component within te mould has cooled adequately, the person handling the operation can then remove the finalized item from the mould. The process is repeated from the start, supplying a number of exact products.

For more information on the different rotational molding options offered for the Mackinac Island MI 49757, please call our toll free number  866-971-7861 or fill out the form on the right for a consultation!

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