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Rotational moulding pertains to a plastic production solution that creates hollow stress-free product lines. The procedure depends on high temperatures and bi axial rotation to follow up with seamless, one piece objects that have various shapes, sizes and colors. This method is also referred to as rotomolding or rotocasting. Sometimes the term slush moulding is used for certain liquid vinyl types.
The function that makes this unique from other plastic manufacturing techniques that no pressure is called for. It also has few contenders when it comes down to the manufacture of large hollow items which are long-lasting and inexpensive.There is a variety of product lines that are generated by this process including big water tanks, automobile products, intricate molded medical products, leisure equipment, toys, canoes, commercial equipment among many others.This is because of the flexibility in regards to style and shapes that the process makes
Benefits of Using Rotomolding to Manufacture Plastic Products
- – Relatively low tooling costs.
When compared to other plastic manufacturing processes in Alamosa CO 81101, 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 Colorado 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 Alamosa Colorado 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 Method Components
This molding process has been used since early times for creatingvseverl products. Egyptians as an example, employed rotocasting systems in the making of ceramics. The Swiss were also employing this rotation approach to create hollow chocolate eggs. Some plastic items in the USA were developed using this procedure some time between 1940 and 1950. The technique has however taken long to catch on because it was considered as being a pretty slow-moving process
1. Mould preparation.
A predetermined measure of polymer in particle form is packed into a hollow mould. The mould is usually comprised of cast aluminium or sheet steel material. The color tone wanted for the final goods is pre compounded into the polymer. The most commonly 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 starts, and it may be done by either conduction, convection or sometimes radiation. It is warmed to temperatures between 500-700F. The mold with the powdered polymer is then secured and put inside the oven.
2. The heating and fusion process.
Once placed into the oven, the mould is turned on two axis so the powdered polymer melts from the heat and coats the inside if the mould. The rotation is done gradually, about 20 rotations per sixty seconds. Something that is vital at this moment is the period of time the mold will spend within the oven. If it stays to long, the component will lose stability and strength, generating a weak item. If it is taken out from the oven prematurely, the polymer will not have flowed correctly, which produces bubbles in the finalized item.
3. Mold cooling down.
When the component has sufficiently spent the right amount of time in the oven, it is then removed for cooling. This can be done by air or water, or sometimes a mixture of both which a cool mist. When the material cools, it reduces a little for ease of removal from the mould. This is an additional procedure that depends a lot on the right timing, since quick cooling decreases the material too quickly, causing bending of the item.
4. The un-loading or de-moulding step.
Once the product within te mould has cooled correctly, the person taking care of the process can then remove the finished product from the mold. The function is repeated from the beginning, making a series of exact products.
For more information on the different rotational rotomolding options offered for the Alamosa CO 81101 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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