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    Introduction and history of injection molding


    Injection molding, also known as injection molding, injection molding and molding it is a method. Injection molding method has the advantages of fast production speed, high efficiency, the operation can be automated, color varieties, the shape can be simple to complex, the size can be descending, and the size of the product accurate, easy to replace the product, the shape can be complex Parts, injection molding for mass production and complex shape products processing areas.
    At a certain temperature, a completely melted plastic material is stirred by a screw and injected into a cavity at a high pressure. After cooling and solidification, a molded product is obtained. The method is suitable for the mass production of complex parts and is one of the important processing methods.
    In 1868, Highy developed a plastic material, which he named Celllu. Celluloid was invented by Alexander Parks in 1851. Sea Astra to improve it, so that it can be processed into the finished shape. Hai Ya Te with his brother Isaiah in 1872, registered the first plunger injection machine patents. This machine is relatively simpler than the machines used in the 20th century. It runs essentially like a giant hypodermic needle. This huge needle (diffuser) injects plastic into the mold through a heated cylinder.
    World War II in the 1940s made a huge demand for cheap, mass-produced products. , Low prices, mass-produced products.
    In 1946, the first injection molding machine built by American inventor James Watson Hendley made for more precise control over the speed and quality of the injected product. The machine also allows the material to be mixed prior to injection so that colored or recycled plastics can be thoroughly mixed and injected into the native biomass. 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 then developed the first gas-assisted injection molding process and allowed the production of complex, hollow products for rapid cooling. This greatly increases design flexibility and the power and end-point manufacturing components while reducing production time, cost, weight and waste.