Do you know all 6 kinds of plastic molds?
Do you know all 6 kinds of plastic molds?
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.
1. Injection mold
It is mainly a molding mold most commonly used in the production of thermoplastic parts. The processing equipment corresponding to the injection mold is an injection molding machine. Pushed by the plug, it enters the mold cavity through the nozzle of the injection molding machine and the gating system of the mold, and the plastic is cooled and hardened to form, and the product is demoulded.
Its structure is usually composed of molding parts, pouring system, guide parts, push-out mechanism, temperature adjustment system, exhaust system, support parts and other parts, and is made of plastic mold steel. The injection molding processing method is usually only suitable for the production of thermoplastic products. Plastic products produced by injection molding technology are very extensive, from daily necessities to various complex electrical appliances, auto parts, etc., are all formed by injection molds. It is It is the most widely used processing method in the production of plastic products.
2. Blow mold
A mold used to form plastic container hollow products (such as beverage bottles, daily chemical products and other packaging containers). The blow molding form mainly includes extrusion blow molding hollow molding and injection molding according to the process. The principles mainly include extrusion blow molding hollow molding, injection blow molding hollow molding, injection stretch blow molding hollow molding (commonly known as injection stretch blow molding), multi-layer blow molding hollow molding, sheet blow molding hollow molding, etc.
The equipment corresponding to the blow molding of hollow products is usually called a plastic blow molding machine, and blow molding is only suitable for the production of thermoplastic products. The structure of the blow mold is relatively simple, and the materials used are mostly made of carbon.
3. Extrusion die
A type of mold used to form continuous-shaped plastic products, also known as extrusion molding heads, is widely used in the processing of pipes, rods, monofilaments, plates, films, wire and cable coatings, and profiled materials.
The corresponding production equipment is a plastic extruder. The principle is that the solid plastic is melted and plasticized under the conditions of heating and screw rotation of the extruder, and is made into a mold with the same cross-section and shape as the die through a die of a specific shape. Continuous plastic products. Its manufacturing materials mainly include carbon structural steel, alloy tools, etc. Some extrusion dies are also inlaid with wear-resistant materials such as diamonds on parts that need to be wear-resistant.
The extrusion process is usually only suitable for the production of thermoplastic products, and its structure is obviously different from injection molds and compression molds.
4. Blister mold
A mold that uses plastic plates and sheets as raw materials to form some relatively simple plastic products. When softened, it deforms and sticks to the cavity of the mold to obtain the required molded product. It is mainly used in the production of some daily necessities, food, and toy packaging products.
Because the pressure of the plastic mold is low during molding, the mold material is mostly made of cast aluminum or non-metallic materials, and the structure is relatively simple.
5. Compression mold
Including compression molding and injection molding two structural mold types. They are a type of mold mainly used to form thermosetting plastics, and the corresponding equipment is a pressure molding machine.
According to the characteristics of the plastic, the compression molding method heats the mold to the molding temperature (generally 103°108°), then puts the measured compression molding powder into the mold cavity and the feeding chamber, closes the mold, and the plastic is formed under high heat and high pressure. Softens the viscous flow, solidifies and shapes after a certain period of time, and becomes the desired product shape.
The difference between injection molding and compression molding is that there is no separate feeding chamber. Before molding, the mold is closed first. The plastic is preheated in the feeding chamber and becomes viscous. Under pressure, it is adjusted and extruded into the cavity of the mold to harden and form.
The compression mold is mainly composed of cavity, feeding cavity, guiding mechanism, ejection parts, heating system and so on. Injection molds are widely used in the packaging of electrical components. The materials used in the manufacture of compression molds are basically the same as those of injection molds.
6. High foam polystyrene molding mold
It is a mold that uses expandable polystyrene (bead-shaped material composed of polystyrene and foaming agent) raw materials to form foam packaging materials of various required shapes.
The principle is that expandable polystyrene can be steam-formed in the mold, including two types of simple manual operation mold and hydraulic machine straight-through foam plastic mold, which are mainly used to produce packaging products for industrial products. The materials for making such molds include cast aluminum, stainless steel, bronze, etc.
