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Injection Molds Classification or types of mold injection very depend on what we need to make the plastic parts， because every part has a specific and unique design. when designing molds we must see the influencing factors, like geometry, number of cavities, ejection principle, plastic material and shape of parts. Below we will explain the mold classification with a few most seen types of injection molding molds.
When the mold is opened, the movable mold and the fixed mold are separated to take out the plastic parts, which is called a single parting surface mold, also known as a double-plate mold. It is the simplest and most basic form of injection mold. It can be designed as a single cavity injection mold or a multi-cavity injection mold according to needs. It is the most widely used injection mold.
The double parting surface injection mold has two parting surfaces. Compared with the single parting surface injection mold, the double parting surface injection mold adds a partially movable intermediate plate (also called the movable gate plate, There are gates, runners and other parts and components required for the fixed mold), so it is also called a three-plate (moving template, intermediate plate, fixed template) injection mold;
It is often used for single-cavity or multi-cavity injection molds with point gate feeding. When the mold is opened, the intermediate plate is separated from the fixed platen by a certain distance on the guide column of the fixed mold, so that it can be taken out between the two plates. Pouring system condensate. The double-parting surface injection mold has a complex structure, high manufacturing cost, and difficult parts processing. It is generally not used for the molding of large or extra-large plastic products.
When the plastic part has side holes or undercuts, it is necessary to use a core or slider that can move laterally. After injection molding, the movable mold first moves down a certain distance, and then the inclined section of the curved pin fixed on the fixed plate forces the slider to move outward, and at the same time, the push rod of the demoulding mechanism pushes the push plate to make the plastic part form itself. Take off the core.
Due to some special structures of plastic parts, the injection mold is required to be equipped with movable molding parts, such as movable punches, movable concave molds, movable inserts, and movable threaded cores or rings, etc., which can be combined with the plastic parts during demolding. They are removed from the mold together and then separated from the plastic part.
For threaded plastic parts, when automatic demolding is required, a rotatable threaded core or ring can be set on the mold, and the mold opening action or the rotation mechanism of the injection molding machine, or a special transmission device can be used to drive the thread. The core or threaded ring rotates, thereby dislodging the part.
The runners injection mold refers to the method of adiabatic heating of the runner to keep the plastic between the nozzle and the cavity of the injection molding machine in a molten state, so that there is no gating system congealing when the mold is opened and the plastic parts are taken out. The former is called adiabatic runner injection mold, and the latter is called hot runner injection mold.
Right-angle injection molds are only suitable for angle injection molding machines. Different from other injection molds, the feeding direction of this type of mold is perpendicular to the opening and closing direction during molding. Its main flow channel is opened on both sides of the moving and fixed mold parting surfaces, and its cross-sectional area is usually unchanged, which is different from other injection molding machine molds. The end of the main flow channel is used to prevent the injection molding machine. The wear and deformation of the nozzle and the inlet end of the main flow channel can be replaced by a replaceable flow channel insert.
In most injection molds, the demolding device is installed on the side of the movable mold, which is conducive to the work of the ejector device in the mold opening and closing system of the injection molding machine. In actual production, because some plastic parts are limited by the shape, it is better to leave the plastic parts on the side of the fixed mold for molding. To make the plastic parts come out of the mold, it is necessary to set the mold release on the side of the fixed mold. mechanism.
Learning about the different types of injection molding can help you a lot in terms of making decisions about part production. Experts in the molding industry can equip you with resources on how you can maximize each type to fulfill your design needs. For more information, please do not hesitate to contact us.
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