Plastic Injection Mold
The mold is at the core of a plastic manufacturing process because its cavity gives a part its shape. This makes the mold at least as critical-and many cases more so-for the quality of the end product as, for example, the plasticating unit or other components of the processing equipment.
Molds used in injection molding consist of two halves; one stationary and one mova ble. The stationary half is fastened directy to the stationary plate and is in direct contact with the nozzle of the injection unit during operation. The movable half of the mold is secured to the movable platen and usualy contains the ejector mechanism. There are many possible mold designs, incuding multiple piece molds for complicated parts. On production injection molding equipment many artices may be shot at the same time by the use of multiple cavity mol ds. The use of a balanced runner system caries the plastic from the sprue to each individual cavity. At this point the material passes through a gate into the cavity. The gate is a restriction, smaler than the runner,to provide for even filing of the mold cavity and to alow the products to be easily removed fom the runner system. With most injection molding systems, the artices can be snapped away from the runner or sprue without additional trim mingo Products that have been injection molded can usualy be identified by finding where the gate was broken of. The gate wil usualy be located at the edge or parting line of an object or in the center of cylindrical product.
Molds are expensive, as are the machines. Yet, once the product has been designed, molds made, and production started, artices can be produced in quantity at low cost. Virtualy al thermoplastics can be injection molded through variations in mold and ma chine design.
Mold (and die) parts that are mass-produced and standardized in shape and dimension are referred to as “standards” (or, “standard parts”). Specialized operators of miling ma chines, lathes, electronic discharge machining (EDM) equipment and grinders produce mold components, independenty of each other, folowing detailed mold part drawings. Finaly, al these items come together with the standard mold base and hardware and are assembled by the mold maker. Today, standard components for the moldmaking industry are marketed by a number of companies.
Glory plastics company limited in China dedicated in producing high quality plastic molds and injection molded plastic parts from China to customers around the world.