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rotomolding-Milton-Rotational moulding pertains to a plastic production procedure that generates hollow stress-free product lines. The method relies upon high temperatures and bi axial rotation to follow up with seamless, one piece objects that have different forms, sizes and colors. This technique is also called rotomoulding or rotocasting. Sometimes the term slush molding is used for certain liquid vinyl forms.

The attribute that makes this unique from other plastic manufacturing processes that no pressure is required. 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 product lines that are produced by this process including large size water tanks, automobile products, complex designed medical products, recreation equipment, toys, kayaks, commercial equipment among many others.This is because of the versatility in terms of style and shapes that the process manufactures

Benefits of Using Rotomolding to Manufacture Plastic Products

  • Relatively low tooling costs.
    When compared to other plastic manufacturing processes in Milton PA 17847, 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 Products-Milton-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 Pennsylvania 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 Milton Pennsylvania 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 Roto-Molding Method in Detail

This molding process has been used since earlier times for creatingvseverl items. Egyptians for example, worked with rotocasting procedures in the creating of ceramics. The Swiss were also using this rotation method to generate hollow chocolate eggs. Some plastic products in the USA were made utilizing this procedure some time between 1940 and 1950. The technique has however taken long to catch on because it was considered as being a very slow process

1. Mould prep work.
A predetermined measure of polymer in powder form is filled into a hollow mold. The mold is usually made of cast aluminium or sheet steel substance. The colour needed 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 type of plastic assembly.

Preheating of the oven follows, and it may 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 locked and put within the oven.

2. The heat and fusion step.
Once within the oven, the mold is revolved on two axis so the powdered polymer melts from the heat and coats the inside if the mold. The turning is done slowly, about 20 revolutions per min. Something that is critical at this point is the period of time the mould will spend within the oven. If it stays to long, the material will lose stability and strength, creating a faulty product. If it is removed from the oven too early, the polymer will not have flowed correctly, which generates bubbles in the completed product line.

3. Mold cooling down.
When the component has completely 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 creates a cool mist. When the material cools, it reduces somewhat for ease of removal from the mold. This is yet another step that relies a lot on the right timing, since quick cooling reduces the material too quickly, causing bending of the item.

4. The offloading or de-moulding step.
When the product inside te mould has cooled adequately, the person managing the process can then extract the finalized product from the mold. The process is repeated from the beginning, providing a series of exact product lines.

For more information on the different rotational molding options offered for the Milton PA 17847 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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