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Rotational moulding pertains to a plastic production solution that makes hollow stress-free products. The technique utilizes high temperatures and bi axial rotation to come up with seamless, one piece objects that have varying forms, colors and sizes. This technique is also called rotomolding or rotocasting. Sometimes the term slush moulding is used for certain liquid vinyl forms.
The feature that makes this unique from other plastic manufacturing procedures because no pressure is needed. It also has few rivals when it comes to the production of sizable hollow items which are durable and inexpensive.There is a variety of product lines that are generated by this process including big water tanks, automobile materials, complex designed medical items, leisure equipment, toys, canoes, industrial equipment among many others.This is because of the versatility in terms of design and shapes that the process creates
Benefits of Using Rotomolding to Manufacture Plastic Products
- – Relatively low tooling costs.
When compared to other plastic manufacturing processes in Bakersfield CA 93301, 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
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 California 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 Bakersfield California 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 Procedure Components
This moulding operation has been used since early times for creatingvseverl items. Egyptians as an example, employed rotational molding solutions in the manufacturing of ceramics. The Swiss were also employing this rotation method to create hollow chocolate eggs. Some plastic items in the USA were manufactured utilizing this method some time between 1940 and 1950. The procedure has however taken long to take affect because it was looked at as being a very slow-moving process
1. Mold readying.
A fixed measure of polymer in powder form is filled into a hollow mold. The mold is usually constructed from cast aluminium or sheet steel component. The color tone intended for the finished product 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 style of plastic engineering.
Pre-heating of the oven follows, and it can 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 placed into the oven.
2. The heating up and fusion step.
Once within the oven, the mold is turned on two axis so the powdered polymer liquefies from the heat and coats the inside if the mold. The spinning is done gradually, about 20 rotations per sixty seconds. Something that is vital at this moment is the period of time the mould will spend within the oven. If it stays to long, the product will lose stability and durability, producing a poor item. If it is removed from the oven too early, the polymer will not have melted correctly, which develops bubbles in the finalized product.
3. Mould cooling down.
When the product has sufficiently spent the right amount of time in the oven, it is then taken out for cooling. This may be done by air or water, or sometimes a mixture of both which creates a cool mist. When the product cools, it shrinks slightly for ease of removal from the mold. This is yet another procedure that relies a lot on the ideal timing, since rapid cooling shrinks the material too rapidly, causing warping of the product.
4. The offloading or de-moulding step.
As soon as the product within te mould has cooled effectively, the molder handling the operation can then remove the finished product from the mold. The technique is repeated from the start, making a series of similar items.
For more information on the different rotational rotomolding options offered for the Bakersfield CA 93301 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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