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Rotational molding refers to a plastic production technique that creates hollow stress-free items. The method utilizes high temperatures and bi axial rotation to come up with seamless, one piece items that have varying shapes, sizes and colors. This procedure is also called roto-molding or rotocasting. Sometimes the term slush molding is used for certain liquid vinyl forms.
The attribute that makes this unique from other plastic manufacturing methods that no pressure is involved. It also has few rivals when it involves the creation of large hollow products which are durable and inexpensive.There is a variety of products that are developed by this process including large size water tanks, automobile materials, complex shaped medical products, leisure equipment, toys, canoes, industrialized equipment among many others.This is due to the versatility in terms of style and forms that the process manufactures
Benefits of Using Rotomolding to Manufacture Plastic Products
- – Relatively low tooling costs.
When compared to other plastic manufacturing processes in Laverne OK 73848, 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
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 Oklahoma 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 Laverne Oklahoma 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 Procedure in Detail
This molding method has been used since earlier times for creatingvseverl product lines. Egyptians as an example, utilized rotocasting methods in the producing of ceramics. The Swiss were also making use of this rotation format to generate hollow chocolate eggs. Some plastic products in the USA were developed utilizing this approach some time between 1940 and 1950. Because it was considered to be a somewhat slow-moving procedure, the technique has however taken long to catch on
1. Mold readying.
A fixed amount of polymer in grain form is packed into a hollow mould. The mold is usually constructed from cast aluminium or sheet steel component. The coloration 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 format of plastic manufacturing.
Preheating 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 mould with the powdered polymer is then secured and inserted inside the oven.
2. The heat and fusion procedure.
Once placed into the oven, the mould is rotated on two axis so the powdered polymer liquefies from the heat and coats the inside if the mold. The turning is done gradually, about 20 spins per sixty seconds. The main thing that is vital at this point is the period of time the mold will spend within the oven. If it overstays, the material will lose stability and durability, producing a poor item. If it is taken out from the oven prematurely, the polymer will not have melted properly, which develops bubbles in the finished product line.
3. Mold cooling.
When the component has sufficiently 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 a cool mist. When the product cools, it reduces a little for ease of removal from the mould. This is an additional measure that depends a lot on the correct timing, since rapid cooling shrinks the material too quick, causing bending of the item.
4. The offloading or de-molding phase.
When the material within te mold has cooled effectively, the person managing the procedure can then remove the finalized item from the mould. The procedure is repeated from the start, providing a number of similar products.
For more information on the different rotational rotomolding options offered for the Laverne OK 73848 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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