History of injection molding

1868, Hyatt developed a plastic material, which he named celluloid. Celluloid was made by Alexander in 185 1? Parks invented it. Hyatt improved it in order to process it into a finished shape. Hyatt and his brother Isaiah registered the patent right of the first plunger injection machine at 1872. This machine is relatively simpler than the one used in the 20th century. It's basically like a giant hypodermic needle. This huge needle (diffuser) injects plastic into the mold through a heated cylinder.

In the 1940s, World War II created a huge demand for cheap and mass-produced products. Low price, mass production products.

1946, American inventor James Watson Haendly built the first injection molding machine, which made it possible to control the injection speed and quality of products more accurately. The machine can also thoroughly mix colored or recycled plastics and inject them into the original biomass before mixing and injecting materials. 195 1 year, the United States developed the first screw injection machine, but it did not apply for a patent, and this device is still in use.

In 1970s, Haendly developed the first gas-assisted injection molding process, which allowed the production of complex hollow products and rapid cooling. This greatly improves the design flexibility, strength and finished parts, while reducing production time, cost, weight and waste.