How much do you know about the classification of injection molds?

Injection mold is a tool for producing plastic products. It is the core pillar of cosmetic packaging materials, especially plastic product packaging materials. It is also a tool for giving plastic products a complete structure and precise dimensions.

Plastic molds are tools that are matched with plastic molding machines in the plastic processing industry to give plastic products a complete configuration and precise dimensions. According to the different molding methods, it can be divided into different mold types. Through the combined use of various systems or auxiliary mechanisms in the mold, the plastic particles are liquefied at high temperature and filled into the mold cavity to produce tools for industrial parts with specific shapes, sizes, functions and qualities.

Common mold classification can be divided into the following categories:

01. Single parting surface injection mold

When the mold is opened, the movable mold and the fixed mold are separated to take out the plastic part, 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.

02. Double parting surface injection molding

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 middle plate (also called 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, middle plate, fixed template) injection mold, which is often used for single-type injection molds fed by point gates. cavity or multi-cavity injection mold, when the mold is opened, the middle plate is separated from the fixed template by a fixed distance on the guide post of the fixed mold, so that the pouring system condensate can be taken out between the two templates.

Double parting surface injection mold has complex structure, high manufacturing cost, and difficult parts processing, so it is generally not used for molding large or extra large plastic products.

03. Injection mold with side parting and core pulling mechanism

When the plastic part has side holes or undercuts, it needs to be molded with a laterally movable core or Slider. After injection molding, the movable mold first moves downward for a certain distance, and then the inclined section of the bent pin fixed on the fixed template 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 self-forming take off the core.

04. Injection mold with active molded parts

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 dies, movable inserts, movable threaded cores or rings, etc., which can be combined with the plastic parts during demoulding. Move out of the mold together, and then separate from the plastic part.

05. Automatic thread unloading injection mold

For plastic parts with thread, when automatic demoulding is required, a rotatable thread 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 turns, thereby releasing the part.

06. No runner injection mold

The non-runner injection mold refers to the method of adiabatically heating 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 pouring system condensate when the mold is opened and the plastic part is taken out. The former is called adiabatic runner injection mold, and the latter is called hot runner injection mold.

07. Right angle injection mold

Right-angle injection molds are only suitable for angle injection molding machines. The difference from other injection molds is that the feeding direction of this type of mold is perpendicular to the direction of mold opening and closing during molding. Its main channel is opened on both sides of the moving and fixed mold parting surfaces, and its cross-sectional area is usually constant, which is different from other injection molding machine molds. The end of the main channel is designed to prevent the injection molding machine from In case of wear and deformation of the nozzle and the inlet end of the main flow channel, a replaceable flow channel insert can be provided.

08. Injection mold with demoulding mechanism on fixed mold

In most injection molds, the demoulding device is installed on the side of the moving mold, which is beneficial 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 part on the side of the fixed mold for molding. In order to make the plastic part out of the mold, it is necessary to set the demoulding on the side of the fixed mold mechanism.