What You Need to Know about Injection Molding
Today, there are many kinds of manufacturing techniques. One common and useful technique is called injection molding. Injection molding involves the production of parts by injecting a special material into a mold. The types of materials that can be used in this process include metals, glasses and, most commonly, a variety of types of plastics.
The material of choice is heated, mixed and then injected into a mold cavity. The mold cavity is typically filled to between 95% and 99% full. Afterwards, slight pressure is applied to perfect the mold. Once in the mold cavity, the material cools and hardens to the shape of the mold. Because temperature plays an important role in the process, injection molds and machines must be kept at specific temperatures and humidity levels to achieve optimal results. Speed is also important, as the quicker a plastic is injected into the mold, the smoother and more accurate the finished product will be.
The history of injection molded components began in the 19th century. In 1872, John Wesley Hyatt invented the first injection mold machines. Some of the first products produced using this technique included collar stays, buttons and hair combs. However, it was not until the outbreak of World War II that the need for mass production of products propelled the popularity of plastic injection molding in manufacturing.
Injection molding components are used in a variety of industries and for a multitude of purposes. Plastic injection molding products are commonly used in aerospace and automotive industries to create injection molding components for vehicles and technology. Other injection molding components include bottle caps, chairs, tables, storage containers, and mechanical parts. In fact, most plastic products available today are injection molding components.