Alexander Parks invented the first synthetic plastic in 1855. The invention of plastic has forever changed the world of manufacturing. As plastic continues to develop with different properties, the practicality of this product continues to grow. Plastic is now widely used in medicine, food services and almost all manufacturing. The invention of injection molds has completely changed the way plastics are used in industry. Molded plastic can form almost any conceivable shape, it is a hard material that can withstand a lot of wear and tear. Molded plastic is very popular in the manufacturing industry because it is cheap and relatively easy to form. The process of plastic molding is fast and simple, which enables manufacturers to quickly reverse parts and allow companies to move forward in record time. By using injection molds to mold the plastic, rather than making new machines for each new part, it saves time and money for manufacturers and customers. This practical process can be used to make plastic parts of all sizes and shapes that can be used to make any part you can imagine. The injection mold uses plastic particles that enter the injection chamber through the Hopper. In the injection chamber, the reciprocating screw ensures uniform distribution of particles. The heater then melts the plastic so that the plastic can be fed into the mold cavity and then into the mold which can be processed into whatever shape you need. Once the plastic enters the mold, the movable plate is stuck on the plastic to form the part. The combination of pressure and heat makes the plastic hard enough to form a durable molded plastic. The use of molded plastics has spread rapidly throughout the manufacturing industry. Because of its cheap price and fast turnover, it is suitable for use in a variety of different manufacturing applications. It is durable and fast, and that is another reason why plastic is such a great product innovation. All walks of life are discovering new ways to use plastic every day, and injection molds are the reason for these inventions. By using plastic to form parts, the company can save time and money in the manufacturing process, thus providing more for customers.