Why Plastic Injection Molding Is Useful
Today, components of large products that we use today are made using a process called injection molding. Ice trays, bottle caps, and bins are just some of the products that are made from injection molding which uses mold cavities where molten material is poured and solidified.
There are many different kinds of materials which can be used for injection molding and this includes glass, metal and thermoplastics. If we consider cost and recyclability, plastics rule over the other materials, and this will be discussed below.
The best and low cost alternative to metal, which is expensive, and glass, is plastic. Plastic is durable, rust-free and very tough considering that it is low in density. In particular, thermoplastic allows manufacturers to produce very complex shapes at a much lower cost than other materials. Its pliability allows it to take o almost any shape but hardens when cooled. Plastic becomes brittle in very cold temperatures and this is why they put additives to prevent this. If you want to form other shapes from a finished product, you can just simply reheat it.
If you have to make plastic products by hand, what could be the result? We will have products with bad shapes and are structurally weak. With injection molding design precision is achieved, and structural soundness is maintained. Below are some of the other benefits of injection molding.
If molds are used the amount of scrap is reduced or eliminated because the cavities are shaped to contain only the amount of plastic that is needed. You save money with this and you will have less problem with waste management.
Other parts and components can be made from waste plastic. Scrap plastic and virgin plastic are of the same quality. There is a great minimization of waste.
The cost of labor for using injection plastic is not as high the cost for molding plastic by hand. There is high productivity and the time taken to manufacture products is drastically cut down.
There are little or no defects with injection molded plastics. Sometimes there are defects in the resulting plastic product with the common defects being burrs, uneven layers, blisters, voids, and empty spaces on the surface. Defaced products are remade.
Though plastic is known to many as non-biodegradable, it is highly recyclable and plants can use discarded and unused plastic parts.
Since almost everything in the work is done in the injection molding, then the finishing time is shorter. Labor cost and time is further reduced.
If metal and glass cannot be used in certain applications they use molded plastic products. Plastic is used by industries like automotive, oil, gas, and electronics on a regular basis.