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

rotocasting-Downingtown-Rotational molding pertains to a plastic manufacturing technique that produces hollow stress-free products. The function depends on high temperatures and bi axial rotation to follow up with seamless, one piece items that have a variety of shapes, sizes and colors. This method is also referred to as rotomolding or rotocasting. Sometimes the term slush moulding is used for certain liquid vinyl types.

The benefit that makes this unique from other plastic manufacturing processes that no pressure is involved. It also has few competitors when it comes to the creation of large hollow items which are long-lasting and inexpensive.There is a wide variety of items that are produced by this process including big water tanks, automobile items, complex shaped medical products, leisure equipment, toys, canoes, commercial equipment among many others.This is because of the flexibility in terms of design and forms that the process makes

Benefits of Using Rotomolding to Manufacture Plastic Products

  • Relatively low tooling costs.
    When compared to other plastic manufacturing processes in Downingtown PA 19335, 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-Downingtown-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 Downingtown 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 Process in Detail

This molding technique has been used since early times for creatingvseverl items. Egyptians for instance, employed roto-molding systems in the creating of ceramics. The Swiss were also making use of this rotation technique to make hollow chocolate eggs. Some plastic products in the USA were made utilizing this method some time between 1940 and 1950. The process has however taken long to catch on because it was considered to be a somewhat slow process

1. Mould readying.
A predetermined measure of polymer in grain form is filled into a hollow mould. The mould is usually crafted from cast aluminium or sheet steel substance. The color preferred for the finished item 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 design of plastic engineering.

Pre-heating of the oven starts, and it may be done by either conduction, convection or sometimes radiation. It is heated to temperatures between 500-700F. The mould with the powdered polymer is then locked and placed within the oven.

2. The heating up and fusion phase.
Once within the oven, the mould is rotated on two axis so the powdered polymer liquefies from the heat and layers the inside if the mold. The spinning is done slowly and gradually, about 20 revolutions per sixty seconds. One thing that is essential 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, making a poor item. If it is removed from the oven prematurely, the polymer will not have flowed correctly, which creates bubbles in the completed item.

3. Mold cooling.
When the product has completely spent the right amount of time in the oven, it is then removed for cooling. This can be done by air or water, or sometimes a mixture of both which generates a cool mist. When the material cools, it shrinks a little for ease of removal from the mould. This is an additional procedure that depends upon a lot on the correct timing, since rapid cooling shrinks the material too rapidly, causing bending of the product.

4. The discharging or de-moulding step.
Once the component inside te mold has cooled successfully, the person handling the procedure can then take out the finished product from the mould. The technique is repeated from the beginning, supplying a series of identical product lines.

For more information on the different rotational molding options offered for the Downingtown PA 19335 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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