In 1868, Hayat developed a plastic material that he named Celluloid. The celluloid was invented by Alexander Parkes in 1851. Hyatt improves it so that it can be processed into a finished shape. In 1872, Hyatt and his brother Isaiah registered the patent for the first plunger injection machine. This machine is relatively simple compared to the machines used in the 20th century. It operates basically like a huge hypodermic needle. This huge needle (diffuser) injects plastic through a heated cylinder into the mold.
In the 1940s, World War II created a huge demand for cheap, mass-produced products. , Cheap, mass-produced products.
In 1946, the American inventor James Watson Hendry built the first injection molding machine, which allows more precise control of the injection speed and mass produced items. The machine also allows the mixed or injected plastics to be thoroughly mixed into the raw biomass before the materials are mixed and injected. In 1951, the United States developed the first screw-type injection machine. It did not apply for a patent. This type of device is still in use.
In the 1970s, Hendry then developed the first gas-assisted injection molding process and allowed the production of complex, hollow products for rapid cooling. This greatly increases the design flexibility as well as the strength and end-of-manufactured components, while reducing production time, cost, weight, and waste.