Large Plastic Molds are Divided Into Several Types

Large plastic molds are molding tools used to produce large plastic products, typically characterized by their large weight, complex structure, and high precision requirements. Large plastic molds can be classified into the following types according to different molding methods:

1. Injection molds: These are the most commonly used molding molds in the production of thermoplastic parts. The corresponding processing equipment is an injection molding machine. The plastic is first heated and melted in the heating barrel at the bottom of the injection molding machine. Then, driven by the screw or plunger of the injection molding machine, it enters the mold cavity through the injection nozzle and the mold's gating system. After the plastic cools and hardens, it is demolded to obtain the finished product. The structure of an injection mold typically consists of molding components, a gating system, guiding components, an ejection mechanism, a temperature control system, a venting system, and supporting components, and is manufactured using plastic mold steel.

2. Blow molds: These are used to mold hollow plastic containers, such as beverage bottles, daily chemical product packaging containers, and other similar products. Blow molding, based on its process principle, mainly includes extrusion blow molding, injection blow molding, injection stretch blow molding, multi-layer blow molding, and sheet blow molding. The equipment used for blow molding hollow products is usually called a plastic blow molding machine. Blow molding is only suitable for the production of thermoplastic products. Blow molding dies have a relatively simple structure and are mostly made of carbon steel.

3. Extrusion Dies: Used to mold and produce continuous-shaped plastic products, such as pipes, rods, monofilaments, sheets, films, wire and cable sheathing, and profiles. The corresponding production equipment is a plastic extruder. The principle is that solid plastic melts and plasticizes under heating and pressure from the rotating screw of the extruder, and is then passed through a die of a specific shape to form a continuous plastic product with a cross-section identical to the die shape. Extrusion die manufacturing materials mainly include carbon structural steel and alloy tools. Some extrusion dies also have wear-resistant materials such as diamond inlaid in parts requiring wear resistance. Extrusion processes are typically only suitable for the production of thermoplastic products, and their structure differs significantly from injection molds and compression molds.

4. Compression Molds: These include two types of molds: compression molding and injection molding, primarily used for molding thermosetting plastics. The corresponding equipment is a compression molding machine. In compression molding, based on the properties of the plastic, the mold is heated to the molding temperature, then metered compression powder is added to the mold cavity and feeding chamber. The mold is closed, and the plastic softens and flows under high heat and pressure, solidifying and shaping into the desired product after a certain time. Injection molding differs from compression molding in that it has a separate feeding chamber. Before molding, the mold is closed, and the plastic is preheated and becomes viscous in the feeding chamber. Under pressure, it is extruded into the mold cavity and hardens. Compression molds mainly consist of a cavity, feeding chamber, guiding mechanism, ejection component, and heating system. Compression molds are widely used in the encapsulation of electrical components. The materials used in manufacturing compression molds are basically the same as those used in injection molds.

5. High-expansion polystyrene molding molds: These molds work by introducing steam into expandable polystyrene within the mold. They include two types: simple manual molds and hydraulic press-type foam plastic molds. They are primarily used to produce packaging products for industrial applications. Materials used to manufacture these molds include cast aluminum, stainless steel, and bronze.

Qingdao Xueyu Molding Products Co., Ltd. is mainly engaged in the design and manufacturing of injection molds, injection molding and secondary processing (spraying, pad printing, ultrasonic welding, stamping), etc. For more information about large plastic molds, please contact us.

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