Different plastic molds have different functions


1. Plastic injection (plastic) mold It is primarily a m […]

1. Plastic injection (plastic) mold
It is primarily a molding die that is most widely used in the production of thermoplastic parts. The processing equipment corresponding to the plastic injection mold is a plastic injection molding machine. The plastic is first heated and melted in the heating barrel at the bottom of the injection machine, and then in the screw of the injection machine Or the plunger advances, the injection system of the injection machine nozzle and the mold enters the mold cavity, the plastic is cooled and hardened, and the product is released from the mold. Its structure is generally composed of molded parts, pouring system, guide parts, launch organization, temperature adjustment system, exhaust system, support parts and other parts. The production materials are generally made of plastic mold steel modules. The commonly used materials are mainly carbon structural steel, carbon east-west steel, alloy east-west steel, and high-speed steel. The injection molding processing method is generally only applicable to the production of thermoplastic products. The plastic products produced by the injection molding process are very wide. From daily necessities to various complex machinery, electrical appliances, transportation parts, etc., are formed by injection molding. It is the most widely used processing method in the production of plastic products.

2. Plastic compression mould
It includes two types of structural molds: compression molding and injection molding. They are the first type of molds used to form thermosetting plastics, and the corresponding equipment is a pressure forming machine. According to the characteristics of plastics, the compression molding method heats the mold to the molding temperature (generally 103°-108°), and then puts the measured compression molding powder into the mold cavity and the feeding chamber, and closes the mold. The plastic is under the effect of high heat and high pressure It is softened and viscous, and after a certain period of time, it solidifies and sets into the desired product shape. The difference between compression injection molding and compression molding is that there is a separate feeding chamber. Before molding, the mold is closed first, and the plastic is preheated in the feeding chamber. The plastic is preheated in a viscous flow state. The shrinking mold is also used to mold some special thermoplastics such as difficult-to-melt thermoplastics (such as polyvinyl fluoride) blanks (cold compression molding), resin lenses with high optical functions, slightly foamed nitrocellulose car steering wheels, etc. . Compression mold is mainly composed of cavity, feeding cavity, guide structure, ejecting parts, heating system and so on. Pressure injection molds are widely used for packaging electrical components. The materials used for making compression moulds are basically the same as injection moulds.

3. Plastic extrusion die
A type of mold used to form plastic products that produce continuous shapes, also known as extrusion molding heads, is widely used in the processing of pipes, rods, monofilaments, plates, films, wire and cable coatings, and shaped materials. The corresponding production equipment is a plastic extruder, the principle of which is that solid plastic is melted and plasticized under the conditions of heating and rotary pressure of the screw of the extruder, and is made into a section with the same shape as the shape of the die through a specific shape of the die Continuous plastic products. The main materials for its production are carbon structural steel, alloys, etc. Some extrusion molds are also inlaid with diamonds and other wear-resistant materials on the parts that require wear. Extrusion process technology is generally only applicable to the production of thermoplastic products, which is significantly different in structure from injection molds and compression molds.

4. Plastic blow mould
It is a mold used to form hollow products of plastic containers (such as various packaging containers such as beverage bottles and daily necessities). The form of blow molding is mainly based on the principle of extrusion blow molding, blow molding and injection blow molding. 2. Injection blow molding hollow molding (commonly known as "injection stretch blow molding"), multilayer blow molding hollow molding, sheet blow molding hollow molding, etc. The equipment corresponding to the blow molding of hollow products is generally called a plastic blow molding machine. 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.

5. Plastic blister mould
It is a mold that uses plastic plates and sheets as materials to form some simpler plastic products. The principle is to use vacuum blooming methods or compressed air forming methods to make plastic plates and sheets fixed on concave or convex molds. Under the condition of heating and softening, it deforms and sticks to the cavity of the mold to obtain the desired molded product. It is mainly used in the production of some daily necessities, food, and toys. The plastic mold has low pressure during molding, so the mold material is mostly made of cast aluminum or non-metallic materials, and the structure is relatively simple.

6. High foam polystyrene mould
It is a mold that uses expandable polystyrene (beads composed of polystyrene and foaming agent) to form foam packaging materials of various shapes. The principle is that expandable polystyrene can be steam-formed in the mold, including two types of simple manual operation mold and hydraulic straight-through foam plastic mold. It is mainly used to produce packaging products for industrial products. The materials used to make this mold are cast aluminum, stainless steel, bronze, etc.