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rotational moulding-Rittman-Rotational molding pertains to a plastic manufacturing technique that creates hollow stress-free products. The procedure uses high temperatures and bi axial rotation to follow up with seamless, one piece objects that have several designs, colors and sizes. This method is also referred to as rotomoulding or rotocasting. Sometimes the term slush molding is used for certain liquid vinyl forms.

The function that makes this different from other plastic manufacturing techniques because no pressure is needed. It also has few rivals when it comes to the manufacture of large size hollow products which are resilient and inexpensive.There is a wide range of items that are developed by this process including large size water tanks, automobile items, sophisticated molded medical products, recreation equipment, toys, canoes, industrialized equipment among many others.This is because of the flexibility in terms of design and shapes that the process produces

Benefits of Using Rotomolding to Manufacture Plastic Products

  • Relatively low tooling costs.
    When compared to other plastic manufacturing processes in Rittman OH 44270, 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 rotomolding 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-Rittman-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 Ohio 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 Rittman Ohio 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 Process in Detail

This molding system has been used since early times for creatingvseverl products. Egyptians as an example, utilized rotomoulding solutions in the manufacturing of ceramics. The Swiss were also employing this rotation design to create hollow chocolate eggs. Some plastic items in the USA were manufactured using this technique some time between 1940 and 1950. The system has however taken very long to catch on because it was thought of to be a somewhat slow-moving process

1. Mold readying.
A fixed amount of polymer in grain form is filled into a hollow mold. The mould is usually built from cast aluminium or sheet steel substance. The colour 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 design of plastic manufacturing.

Pre-heating 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 secured and positioned into the oven.

2. The heating up and fusion process.
Once inside the oven, the mold is spun 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 spins per min. Something that is vital at this point is the period of time the mould will spend inside the oven. If it stays to long, the material will lose stability and durability, creating a poor item. If it is extracted from the oven prematurely, the polymer will not have liquefied properly, which creates bubbles in the finished item.

3. Mold cooling.
When the product has sufficiently spent the enough 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 generates a cool mist. When the component cools, it shrinks somewhat for ease of removal from the mould. This is an additional measure that relies a lot on the right timing, since rapid cooling decreases the material too quickly, causing warping of the material.

4. The un-loading or de-molding phase.
When the component inside te mold has cooled adequately, the molder managing the procedure can then remove the finished product from the mould. The procedure is repeated from the beginning, making a number of identical product lines.

For more information on the different rotational molding options offered for the Rittman OH 44270, please call our toll free number  866-971-7861 or fill out the form on the right for a consultation!

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