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.
The different kinds of materials that can be sued for injection molding are glass, metal, and thermoplastics. If we consider cost and recyclability, plastics rule over the other materials, and this will be discussed below.
Plastic is a low cost alternative to expensive metal and glass. Plastic is known for its durability, rust resistance, and toughness despite its being low in density. If you use thermoplastic, it is possible to produce complex shapes at a much lower cost than any other material. Because it is pliable it can take on any shape and when it is cooled, the shape hardens. There is a need to put additives so that the plastic will not be so brittle especially when exposed to very cold temperatures. If you want to form other shapes from a finished product, you can just simply reheat it.
Imagine a world where all plastic products have to be created by hand. We will have products with bad shapes and are structurally weak. Injection molding ensures precision in design and soundness in structure. The process of injection molding has other benefits like the ones given below.
Since the molding cavities can only contain the amount of plastic that is needed, it minimizes or eliminates scraps. You save money with this and you will have less problem with waste management.
Other parts and components can be made from waste plastic. You can compare the quality of this waste plastic to virgin plastic. Therefore waste is minimized.
Labor cost for using injection molding is a lot lower than what it would cost to mold plastic by hand. Productivity is high with injection molding and it is faster to manufacture products.
If we speak of defects, plastic made with injection molding have very little or no defects. The common defects for this type of molded plastic includes burrs, an uneven layer, blisters when raised bits produce a rough and uneven surface, voids, empty spaces on the surface. They remake products that are defaced.
Despite its bad reputation as being non-biodegradable, plastics are highly recyclable and plants often use discarded and unused plastic parts.
With injection molding there is a shorter finishing time because the process always takes care of most of the work. The cost of labor and time is reduced further.
The only solution where metal and glass cannot be used in certain applications is the use of plastic injection molded products. Industries like automotive, oil, gas, and electronics use plastic on a regular basis.
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