There are many ways to skin a cat, so to speak. Injection molding is a production method for merchandise for use or sale by injecting materials such as metals, glass, elastomers, confections and more commonly thermoplastic and thermosetting polymers into a mold. They are used in the creating of many things and are an ideal way if needing to produce a high volume of the same object.
Jons J Berzelius made the first concentration of polymer from a white crystalline organic acid and a thick, odorless and colorless liquid. He came up with terms like allotrope, isomer, polymer and catalysis for all the different chemicals that he used. He named one such chemical “polymer” that described a natural compound that was made up of the same formula but was different in its molecular weight.
The whole process is controlled by the item manager and after every step the process will be inspected. Anything that does not look right will result in the whole process starting from the beginning. The machines that are normally used are a drilling as well as a grinding machine.
Later another material was made and was called Celluliod. These were created from using compounds produced that reacted to nitric and sulfuric acids as well as a strong smelling compound known today as camphor. Dyes and other agents were also added.
The whole cycle is very short normally between two seconds to two minutes and consists of four stages. Before the material is injected into the mold it needs to be very securely closed by a clamping unit. Each mould it attached to the molding machine and the top half is allowed to move.
The injecting of the materials is usually in the form of pellets and is fed into the machine. They are then pushed towards the mold by the unit. While this is happening the materials are slowly melted by heat and pressure. The melted plastic is injected very quickly and the buildup of the pressure packs and holds the material.
During the Second World War this industry expanded drastically as there was a huge demand for inexpensive and mass produced products. In the middle 1900s the first screw injection machine was made and this one allowed more control over the quickness and superiority of articles produced. The gas assisted process then came about and this permitted a more complex production of hollow articles.
After a certain amount of time the cooled part can be removed by the ejection system which is attached to the back end of the mold. It is then opened with a certain amount of force. This kind of molding is a quick and effective way of producing objects that are too be used frequently.
Genevive B. Mata has taught plastics molding techniques for over 15 years. He specializes in injection molding and thermoforming. If you are interested in learning more about plastic injection molding services then he recommends you visit his friends at PTM: Custom Plastics Injection Molding Company.