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

rotomolding-Warrendale-Rotational molding pertains to a plastic manufacturing solution that makes hollow stress-free items. The technique depends on high temperatures and bi axial rotation to follow up with seamless, one piece products that have several forms, sizes and colors. This technique is also known as roto-molding or rotocasting. Sometimes the term slush molding is used for certain liquid vinyl forms.

The component that makes this unique from other plastic manufacturing methods in that no pressure is called for. It also has few rivals when it comes to the manufacture of large hollow items which are durable and inexpensive.There is a wide range of items that are produced by this process including large water tanks, automobile products, intricate molded medical items, leisure equipment, toys, canoes, commercial equipment among many others.This is due to the versatility in regards to design 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 Warrendale PA 15086, 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

Custom Molded-Warrendale-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 Warrendale 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 Rotomoulding Process Components

This moulding operation has been used since earlier times for creatingvseverl products. Egyptians for instance, employed rotational molding systems in the making of ceramics. The Swiss were also employing this rotation method to generate hollow chocolate eggs. Some plastic products in the USA were manufactured utilizing this procedure some time between 1940 and 1950. The process has however taken long to catch on because it was thought of to be a very slow process

1. Mould fitting.
A predetermined volume of polymer in grain form is packed into a hollow mold. The mould is usually made from cast aluminium or sheet steel component. The color wanted 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 production.

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 locked and placed within the oven.

2. The heat and fusion step.
Once inside the oven, the mold is rotated on two axis so the powdered polymer liquefies from the heat and layers the inside if the mould. The rotation is done slowly and gradually, about 20 rotations per sixty seconds. The main thing that is vital at this point is the period of time the mold will spend inside the oven. If it overstays, the material will lose value and strength, generating a weak product. If it is taken out from the oven prematurely, the polymer will not have melted correctly, which creates bubbles in the finished item.

3. Mould cooling.
When the material has sufficiently spent the right amount of time in the oven, it is then taken out 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 measure that depends a lot on the right timing, since quick cooling reduces the material too fast, causing warping of the material.

4. The un-loading or de-moulding phase.
When the product inside te mold has cooled adequately, the molder handling the procedure can then extract the finished item from the mold. The process is repeated from the beginning, giving a series of identical product lines.

For more information on the different rotational molding options offered for the Warrendale PA 15086 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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