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

roto-molding-Keene-Rotational molding refers to a plastic manufacturing method that generates hollow stress-free product lines. The technique utilizes high temperatures and bi axial rotation to follow up with seamless, one piece products that have varying shapes, sizes and colors. This method is also called rotomoulding or rotocasting. Sometimes the term slush molding is used for certain liquid vinyl types.

The function that makes this unique from other plastic manufacturing techniques in that no pressure is required. It also has few contenders when it comes to the manufacture of large size hollow products which are long lasting and inexpensive.There is a variety of product lines that are produced by this process including big water tanks, automobile items, sophisticated shaped medical items, leisure equipment, toys, canoes, commercial equipment among many others.This is because of the flexibility in terms of 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 Keene NH 3431, 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

Custom Molding-Keene-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 New Hampshire 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 Keene New Hampshire 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 Rotomolding Method Components

This moulding process has been used since early times for creatingvseverl products. Egyptians for example, applied rotational molding systems in the manufacturing of ceramics. The Swiss were also using this rotation technique to generate hollow chocolate eggs. Some plastic product lines in the USA were developed utilizing this procedure some time between 1940 and 1950. The process has however taken long to take affect because it was thought of to be a moderately slow process

1. Mould readying.
A fixed quantity of polymer in grain form is loaded into a hollow mold. The mold is usually constructed from cast aluminium or sheet steel component. The colour preferred for the finished product is pre compounded into the polymer. The most generally used powder resin is polythene, but polyvinyl chloride and nylon can also be used in this style of plastic assembly.

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 sealed and inserted inside the oven.

2. The heating and fusion phase.
Once placed into the oven, the mould is rotated on two axis so the powdered polymer melts from the heat and layers the inside if the mold. The turning is done gradually, about 20 rotations per minute. One thing that is crucial at this moment is the amount of time the mold will spend inside the oven. If it stays to long, the product will lose value and strength, generating a faulty product. If it is taken out from the oven prematurely, the polymer will not have melted properly, which develops bubbles in the completed product.

3. Mould cooling down.
When the material has completely spent the enough 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 a cool mist. When the material cools, it shrinks a little for ease of removal from the mould. This is yet another procedure that depends upon a lot on the ideal timing, since quick cooling reduces the material too fast, causing warping of the material.

4. The unloading or de-moulding step.
As soon as the component within te mold has cooled adequately, the molder managing the process can then take out the completed item from the mold. The technique is repeated from the beginning, providing a number of similar product lines.

For more information on the different rotational rotomolding options offered for the Keene NH 3431 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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