The history of injection molding
2019-06-24
In 1868, Hayat developed a plastic material that he named celluloid. Celluloid was invented by Alexander Parks in 1851. Hyatt improved it so that it could be machined into finished shapes. Hayat and his brother Isaiah patented the first plunger injection machine in 1872. This machine is relatively simple than those used in the 20th century. It basically runs like a giant hypodermic needle. This giant needle (diffusion barrel) injects plastic into the mold through a heated barrel.
The Second World War in the 1940s created a huge demand for inexpensive, mass-produced products. , low-cost, mass-produced products.
In 1946, American inventor James Watson Hendry built the first injection molding machine, which allowed more precise control over the injection speed and quality of the produced items. The machine also enables mixing of materials prior to injection, so that colored or recycled plastics can be thoroughly mixed to inject virgin material. In 1951 the United States developed the first screw injection machine, it did not apply for a patent, this device is still in use.
In the 1970s, Hendry went on to develop the first gas-assisted injection molding process and allowed the production of complex, hollow products that cooled rapidly. This greatly increases design flexibility as well as the strength and end-point of manufactured parts, while reducing production time, cost, weight and waste.
