The basic structure of a plastic mold comprises the following components:

Molds, as a type of paving material, not only enhance the aesthetic appeal of pathways but also help protect the road surface from damage. Driven by urban development needs, they are continually being innovated—both in materials and design—each undergoing varying degrees of advancement. Today, we’ll invite our readers to let their imaginations run wild. Plastic mold What are the fundamental components of a plastic mold? Generally speaking, the basic structure of a plastic mold comprises the following parts.

　　(1) Molding parts

　　Refers to the components that form the mold cavity and come into direct contact with the molten material to produce the plastic part. These typically include the punch, core, forming pin, cavity, forming ring, inserts, and other elements that, once the moving and fixed molds are closed, define the internal and external contours and dimensions of the plastic part.

　　(2) Pouring System

　　The flow of the plastic melt from the injection machine nozzle into the mold cavity is referred to as the gating system, which consists of the main runner, sub-runners, a sprue, and a cold slug well.

　　(3) Guiding and Positioning Mechanism

　　To ensure accurate guiding and centering when the moving mold and the fixed mold are closed, guide posts and guide bushings are typically installed on each, respectively. Plastic mold A conical locating feature must also be provided on the main parting surface. In some cases, guiding components are additionally incorporated to ensure precise movement and resetting of the ejection mechanism.

　　(4) Demolding Mechanism

　　It refers to the mechanism that ejects the plastic part from the mold during the later stages of the molding process.

　　(5) Lateral Parting and Core-Pulling Mechanism

　　Before removing a plastic part with undercuts or side holes from the mold, the side core, side punch, or side core pin must be withdrawn.

　　(6) Temperature Control System

　　To meet the temperature requirements of injection molding processes, plastic molds are equipped with cooling or heating temperature‑control systems. For cooling, cooling channels are typically incorporated into the mold plates. Electric heating elements are installed within or around the mold to provide heat. Certain plastic molds must be fitted with automatic temperature‑control devices.

　　(7) Exhaust System

　　To vent the air originally present in the mold cavity during injection molding, venting measures are often provided at the parting line. For small parts, the required venting volume is relatively small, so venting can be achieved directly through the parting surface. Alternatively, venting can be accomplished by utilizing the clearance between the ejector pins or cores and their mating holes. For large parts… Plastic mold A dedicated venting groove must be provided in advance.

Cooling of the mold must be carried out separately on both the moving and fixed sides, with effectiveness depending on the layout of the cooling channels, the thermal conductivity of the materials, and the techniques used to prevent fluid leakage. When water channels cannot be incorporated into slender cores, high‑thermal‑conductivity metals may be used as substitutes. If the core consists of multiple segments that preclude the installation of cooling channels, cooling can be achieved by employing a well‑conductive plate at the base. The fixed cooling channels on the side should cover most of the molded part’s surface area, and it is advisable to position the channels as close as possible to the cavity surface. If the temperature on the moving side is only about 10°C lower than that on the fixed side, the resulting temperature differential may cause the part to shift, leading to premature wear. The arrangement and configuration of the cooling channels depend on the geometry of the molded part and the distribution of its weight.