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

rotational moulding-Bryn Mawr-Rotational molding refers to a plastic production practice that creates hollow stress-free product lines. The process uses high temperatures and bi axial rotation to come up with seamless, one piece products that have different shapes, sizes and colors. This procedure is also known as roto-molding or rotocasting. Sometimes the term slush moulding is used for certain liquid vinyl styles.

The feature that makes this different from other plastic manufacturing procedures because no pressure is involved. It also has few competitors when it involves the production of large hollow items which are durable and inexpensive.There is a variety of items that are produced by this process including large size water tanks, automobile products, intricate designed medical items, leisure equipment, toys, canoes, industrial equipment among many others.This is due to the flexibility in regards to type and forms that the process develops

Benefits of Using Rotomolding to Manufacture Plastic Products

  • Relatively low tooling costs.
    When compared to other plastic manufacturing processes in Bryn Mawr PA 19010, 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 rotomoulding 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 Molding-Bryn Mawr-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 Bryn Mawr 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 Procedure in Detail

This molding method has been used since ancient times for creatingvseverl product lines. Egyptians for example, used rotomoulding techniques in the making of ceramics. The Swiss were also employing this rotation format to create hollow chocolate eggs. Some plastic items in the USA were made using this procedure some time between 1940 and 1950. Due to the fact that it was viewed to be a fairly slow-moving procedure, the system has however taken long to catch on

1. Mould fitting.
A fixed volume of polymer in particle form is packed into a hollow mould. The mould is usually constructed from cast aluminium or sheet steel material. The colour desired for the final 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 type of plastic engineering.

Pre-heating 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 placed inside the oven.

2. The heating and fusion phase.
Once within the oven, the mold is spun on two axis so the powdered polymer liquefies from the heat and coats the inside if the mould. The spinning is done slowly and gradually, about 20 rotations per sixty seconds. One thing that is critical at this point is the amount of time the mould will spend inside the oven. If it stays to long, the product will lose value and durability, creating a poor product. If it is removed from the oven too early, the polymer will not have melted properly, which creates bubbles in the finished product line.

3. Mould cooling down.
When the component has completely spent the right amount of time in the oven, it is then removed for cooling. This may be done by air or water, or sometimes a mixture of both which creates a cool mist. When the material cools, it shrinks somewhat for ease of removal from the mould. This is one more step that depends upon a lot on the correct timing, since rapid cooling decreases the material too fast, causing bending of the material.

4. The unloading or de-molding phase.
Once the component inside te mould has cooled adequately, the molder managing the procedure can then remove the completed item from the mould. The process is repeated from the start, supplying a series of identical product lines.

For more information on the different rotational molding options offered for the Bryn Mawr PA 19010 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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