Processing method of foamed plastics
DATE：2022/6/14 8:46:31 / READ： / SOURCE：This station
Processing method of foamed plastics
The processing method of foamed plastics is basically the same as that of ordinary plastics, and all equipment is basically the same as that of ordinary plastic products. Extrusion method, injection method, molding method, casting method, blow molding method, calendering method, etc. can be used.
1、 Extrusion molding hollow plate production line www.handern com
Extrusion molding is one of the main methods of foam molding processing. It has a wide range of varieties and applications. Due to the continuity of extrusion molding methods, general pipes and profiles. Foam products such as plates and diaphragms are extruded.
1. hollow plate production line in extrusion process www.handern com
The plastic raw materials containing foaming agent are added into the extruder, and the materials are mixed, melted, sheared and plasticized through screw rotation and heating outside the machine tube. The molten material is continuously formed through the die, then left the die for decompression foaming, and then becomes a product after cooling, traction, cutting, coiling and inspection.
The most outstanding feature of this forming method is continuous production. One machine can be used for multiple purposes, that is, different types of products can be produced by changing the machine head, such as sheets, blow molded sheets, etc., and the production efficiency is high, and the output of single extruder is also high.
2. hollow plate production line of extrusion equipment www.handern com
(1) Common extruders include single screw extruder and twin-screw extruder, including three parts: transmission system, extrusion system and heating and cooling system. The structure of single screw extruder is shown in Figure 1-2.
(2) The extrusion system consists of hopper, barrel, screw and head, which jointly complete the conveying and plasticizing of materials.
(3) Die die is the forming part of extruder, which is the key device to determine the shape and size of products. There are many kinds of them, mainly including pipe head, film head, plate head and profile head. The basic requirements for the machine head are as follows.
① The machine head shall be equipped with a temperature control device to adjust the temperature. Hollow plate production line www.handern com
② The flow passage of the machine head shall be free of dead corners, streamlined and smooth.
③ The machine head shall have sufficient rigidity and corrosion resistance, as well as a certain compression ratio. (4) Auxiliary machine the auxiliary machine is used to cool and draw the extruded products to the coiling and cutting device to become the final product. Auxiliary equipment includes sizing device, cooling device, traction device, coiling device, cutting device, etc.
2、 Injection molding
Injection molding is a one-time molding method, which has high production efficiency and good product quality. It is suitable for foamed plastic products with complex shape and strict size requirements. At the same time, it is also the main method for producing field structured foamed plastic products. Hollow plate production line www.handern com
1. injection molding process
The materials and foaming agent are added into the hopper of the injection machine, and heated and melted to the flowing state through the rotation of the screw and the thermal action of the external machine. Under continuous high pressure, the molten land plastic pin is compressed and moved forward, and is injected into a closed mold with low temperature through the nozzle. After cooling and hardening, the material filled with the mold can maintain the surface sample given by the mold cavity, and the product can be obtained by opening the mold.
2. injection molding equipment
Closing and injection
(1) Injection machine system and electrical control system. The structure of the injection machine is shown in Figure 1-3
The model press is accurate and effective
1- injection device; 2 one mold closing device: 3-hydraulic transmission and electrical control system III
(2) Injection system is the main component of the injection machine. Its main task is plasticization and injection.
Its function is to uniformly plasticize the materials to reach the flowing state, and inject the human mold through the push of the screw under high pressure and faster speed. The injection system is mainly composed of plasticizing parts (including feeding device, barrel and screw type low-pressure generator
And nozzle, etc.), driving device of screw, injection and injection moving oil cylinder.
(3) The clamping system ensures the reliable closing of the forming die and realizes the opening, closing and taking of the die
Devices, etc. The horizontal bar direct pressing clamping device is shown in Figure 1-4. The clamping system consists of fixed formwork, movable formwork, clamping cylinder and ejection equipment
·10 · (4) the hydraulic and electrical control system for injection molding is to use the material plasticizing and mold closing to make the material 1 a mold closing cylinder; 2. Rear fixed formwork; 3- mobile formwork; 4-pull rod; 5- mould; 6-front fixed formwork: 7-a continuous production process consisting of multiple processes such as pull rod nut closing, injection of human mold, pressure maintaining, product curing and finalization, mold opening and product removal. The hydraulic and electrical control system is a power and control system set up to ensure that the injection molding machine can work accurately and effectively according to the molding process requirements (such as pressure, speed, temperature, time, etc.) and action procedures. Hollow plate production line www.handern com
3. injection mold
The injection mold is mainly composed of a concave die, a convex die, a molding core, a guide post and a guide post sleeve. Its internal structure (casting system) can be divided into mold cavity, main flow channel, shunt channel, gate, exhaust port, early setting cold material well, etc.
The molds are respectively installed on the fixed formwork and the movable formwork, and the opening and closing of the molds are realized by the reciprocating motion of the movable formwork. Mold quality directly affects the quality of parts, so we should choose high-precision and high-quality mold.
The processing method of foamed plastics is basically the same as that of ordinary plastics, and all equipment is basically the same as that of ordinary plastic products. Extrusion method, injection method, molding method, casting method, blow molding method, calendering method, etc. can be used.
1、 Extrusion molding hollow plate production line www.handern com
Extrusion molding is one of the main methods of foam molding processing. It has a wide range of varieties and applications. Due to the continuity of extrusion molding methods, general pipes and profiles. Foam products such as plates and diaphragms are extruded.
1. hollow plate production line in extrusion process www.handern com
The plastic raw materials containing foaming agent are added into the extruder, and the materials are mixed, melted, sheared and plasticized through screw rotation and heating outside the machine tube. The molten material is continuously formed through the die, then left the die for decompression foaming, and then becomes a product after cooling, traction, cutting, coiling and inspection.
The most outstanding feature of this forming method is continuous production. One machine can be used for multiple purposes, that is, different types of products can be produced by changing the machine head, such as sheets, blow molded sheets, etc., and the production efficiency is high, and the output of single extruder is also high.
2. hollow plate production line of extrusion equipment www.handern com
(1) Common extruders include single screw extruder and twin-screw extruder, including three parts: transmission system, extrusion system and heating and cooling system. The structure of single screw extruder is shown in Figure 1-2.
(2) The extrusion system consists of hopper, barrel, screw and head, which jointly complete the conveying and plasticizing of materials.
(3) Die die is the forming part of extruder, which is the key device to determine the shape and size of products. There are many kinds of them, mainly including pipe head, film head, plate head and profile head. The basic requirements for the machine head are as follows.
① The machine head shall be equipped with a temperature control device to adjust the temperature. Hollow plate production line www.handern com
② The flow passage of the machine head shall be free of dead corners, streamlined and smooth.
③ The machine head shall have sufficient rigidity and corrosion resistance, as well as a certain compression ratio. (4) Auxiliary machine the auxiliary machine is used to cool and draw the extruded products to the coiling and cutting device to become the final product. Auxiliary equipment includes sizing device, cooling device, traction device, coiling device, cutting device, etc.
2、 Injection molding
Injection molding is a one-time molding method, which has high production efficiency and good product quality. It is suitable for foamed plastic products with complex shape and strict size requirements. At the same time, it is also the main method for producing field structured foamed plastic products. Hollow plate production line www.handern com
1. injection molding process
The materials and foaming agent are added into the hopper of the injection machine, and heated and melted to the flowing state through the rotation of the screw and the thermal action of the external machine. Under continuous high pressure, the molten land plastic pin is compressed and moved forward, and is injected into a closed mold with low temperature through the nozzle. After cooling and hardening, the material filled with the mold can maintain the surface sample given by the mold cavity, and the product can be obtained by opening the mold.
2. injection molding equipment
Closing and injection
(1) Injection machine system and electrical control system. The structure of the injection machine is shown in Figure 1-3
The model press is accurate and effective
1- injection device; 2 one mold closing device: 3-hydraulic transmission and electrical control system III
(2) Injection system is the main component of the injection machine. Its main task is plasticization and injection.
Its function is to uniformly plasticize the materials to reach the flowing state, and inject the human mold through the push of the screw under high pressure and faster speed. The injection system is mainly composed of plasticizing parts (including feeding device, barrel and screw type low-pressure generator
And nozzle, etc.), driving device of screw, injection and injection moving oil cylinder.
(3) The clamping system ensures the reliable closing of the forming die and realizes the opening, closing and taking of the die
Devices, etc. The horizontal bar direct pressing clamping device is shown in Figure 1-4. The clamping system consists of fixed formwork, movable formwork, clamping cylinder and ejection equipment
·10 · (4) the hydraulic and electrical control system for injection molding is to use the material plasticizing and mold closing to make the material 1 a mold closing cylinder; 2. Rear fixed formwork; 3- mobile formwork; 4-pull rod; 5- mould; 6-front fixed formwork: 7-a continuous production process consisting of multiple processes such as pull rod nut closing, injection of human mold, pressure maintaining, product curing and finalization, mold opening and product removal. The hydraulic and electrical control system is a power and control system set up to ensure that the injection molding machine can work accurately and effectively according to the molding process requirements (such as pressure, speed, temperature, time, etc.) and action procedures. Hollow plate production line www.handern com
3. injection mold
The injection mold is mainly composed of a concave die, a convex die, a molding core, a guide post and a guide post sleeve. Its internal structure (casting system) can be divided into mold cavity, main flow channel, shunt channel, gate, exhaust port, early setting cold material well, etc.
The molds are respectively installed on the fixed formwork and the movable formwork, and the opening and closing of the molds are realized by the reciprocating motion of the movable formwork. Mold quality directly affects the quality of parts, so we should choose high-precision and high-quality mold.
Author：admin