Injection molding equipment is equipment that is very important for the operation of injection molding machines. Indeed, all injection molding machines utilize injection molding equipment that includes a power source, injection unit, mold assembly, and clamping unit to perform the four stages of the process cycle.
One of injection molding equipments is injection unit. This injection molding equipment is responsible for both heating and injecting the material into the mold. The first part of this unit is the hopper, a large container into which the raw plastic is poured. The hopper has an open bottom, which allows the material to feed into the barrel that contains the mechanism for heating and injecting the material into the mold.
Another injection molding equipment is clamping unit. Prior to the injection of the molten plastic into the mold, the two halves of the mold must first be securely closed by the clamping unit. The hydraulically powered clamping motor actuates clamping bars that push the moveable platen towards the stationary platen and exert sufficient force to keep the mold securely closed while the material is injected and subsequently cools. After the required cooling time, the mold is then opened by the clamping motor.
There are also molds, typically made of steel or aluminum, as the custom injection molding equipment. The mold has many components, but can be split into two halves. Each half is attached inside the injection molding machine and the rear half is allowed to slide, so that the mold can be opened and closed along the mold’s parting line. The two main components of the mold are the mold core and the mold cavity.
When this injection molding equipment is closed, the space between the mold core and the mold cavity forms the part cavity that will be filled with molten plastic to create the desired part. Multiple-cavity molds are sometimes used, in which the two mold halves form several identical part cavities.
Mold base also includes injection molding equipment that is a place where the mold core and mold cavity are each mounted. Then, the mold base is fixed to the platens inside the injection molding machine. The front half of the mold base includes a support plate, to which the mold cavity is attached, the sprue bushing, into which the material will flow from the nozzle, and a locating ring, in order to align the mold base with the nozzle.
The rear half of the mold base includes the ejection system, to which the mold core is attached, and a support plate. When the clamping unit separates the mold halves, the ejector bar actuates the ejection system. Meanwhile, mold channels are one of injection molding equipment types that is usually integrated into the mold design in order for the molten plastic to flow into the mold cavities.
First, the molten plastic enters the mold through the sprue. Additional channels, called runners, carry the molten plastic from the sprue to all of the cavities that must be filled. At the end of each runner, the molten plastic enters the cavity through a gate which directs the flow. The molten plastic that solidifies inside these runners is attached to the part and must be separated after the part has been ejected from the mold.
Besides using several types of injection molding equipment, there are many types of materials that may be used in the injection molding process. Most polymers may be used, including all thermoplastics, some thermosets, and some elastomers. When these materials are used in the injection molding process, their raw form is usually small pellets or a fine powder. Also, colorants may be added in the process to control the color of the final part.
