Rubber injection molding|Application instructions on how to extrude plastic toys
The application of plastic toys in the processing of thermoplastics and rubber can be used for continuous production such as batching, granulation, rubber filtration, etc., and can produce various continuous products, such as tubes, shapes, plates (or sheets), films, etc., with production efficiency high.
1. Particles
Melt on the extruder, then mix the polymer with various additives, and further uniformly mix. After the porous die, multiple strips are formed, and then cut into particles. Cutting is divided into two types: hot cutting and cold cutting. After the advancing material is opened, it is cut off immediately with a rotary knife while cooling with air or water. The latter method is to cool the strips and send them to the pelletizer.
Second, the pipeline
The material passes through the annular gap formed by the die and the core mold to form a tubular material, and then is shaped and cooled to obtain a tubular material with a smooth surface, precise size and geometric shape. The common shaping method is to use outer diameter shaping, that is, through a shaped sleeve with the same inner diameter as the outer diameter of the product, the pressure difference is used to make the tube contact with the inner wall of the shaped sleeve to obtain precise outer diameter shaping. To generate a pressure difference, compressed air can be passed into the pipe or negative pressure can be generated outside the pipe.
Three, sheet and film
Any flat product with a thickness greater than 0.25 mm and a length greater than its width is called a sheet, and a film with a thickness less than 0.25 mm is called a film.
If a flat film is used, a very smooth surface cooling drum is used to cool and set the film, and then it can be made into a flat film. This method is also called extrusion casting method. Polypropylene films usually use this method. If the obtained flat film is fed into a tenter and stretched 4 to 10 times in the longitudinal and transverse directions at the same time (it can also be stretched in the longitudinal direction and then in the transverse direction), a biaxially oriented film can be made. During the stretching process, the macromolecules are oriented, making the film very strong, but the permeability is reduced. Commonly used in the manufacture of polypropylene and polyester films. If foaming agent is added to the material, and a special screw and die are used, it can also be made into a low-foaming sheet.
Four, covered wire
When the molten plastic passes through the T-shaped die, a coating layer is formed around the bare wire. After cooling and crimping, various wire and cable products can be produced.
Five blown film
Most films are made by blowing air. The decree stipulates that the tube from the die is blown by compressed air, and the formed film bubble is blown and cooled by a wind ring, and then drained by a guide roller (or splint), and then curled into a roll to make a blown film. Many packaging bags and agricultural films use this method to manufacture cylindrical films, which are welded and cut.
Six, compound preparations
Use multiple extruders to supply a variety of plastics at the same time, and then extrude them through a common head to form an integrated composite product, which can produce a variety of composite films, composite sheets, plates, shapes, and tubes.
Seventh, melt spinning
During melt spinning, some resins with high viscosity are often extruded to melt the material. The molten material enters the spinneret directly through the filter, or is injected into the spinneret by a spinneret pump.
1. Particles
Melt on the extruder, then mix the polymer with various additives, and further uniformly mix. After the porous die, multiple strips are formed, and then cut into particles. Cutting is divided into two types: hot cutting and cold cutting. After the advancing material is opened, it is cut off immediately with a rotary knife while cooling with air or water. The latter method is to cool the strips and send them to the pelletizer.
Second, the pipeline
The material passes through the annular gap formed by the die and the core mold to form a tubular material, and then is shaped and cooled to obtain a tubular material with a smooth surface, precise size and geometric shape. The common shaping method is to use outer diameter shaping, that is, through a shaped sleeve with the same inner diameter as the outer diameter of the product, the pressure difference is used to make the tube contact with the inner wall of the shaped sleeve to obtain precise outer diameter shaping. To generate a pressure difference, compressed air can be passed into the pipe or negative pressure can be generated outside the pipe.
Three, sheet and film
Any flat product with a thickness greater than 0.25 mm and a length greater than its width is called a sheet, and a film with a thickness less than 0.25 mm is called a film.
If a flat film is used, a very smooth surface cooling drum is used to cool and set the film, and then it can be made into a flat film. This method is also called extrusion casting method. Polypropylene films usually use this method. If the obtained flat film is fed into a tenter and stretched 4 to 10 times in the longitudinal and transverse directions at the same time (it can also be stretched in the longitudinal direction and then in the transverse direction), a biaxially oriented film can be made. During the stretching process, the macromolecules are oriented, making the film very strong, but the permeability is reduced. Commonly used in the manufacture of polypropylene and polyester films. If foaming agent is added to the material, and a special screw and die are used, it can also be made into a low-foaming sheet.
Four, covered wire
When the molten plastic passes through the T-shaped die, a coating layer is formed around the bare wire. After cooling and crimping, various wire and cable products can be produced.
Five blown film
Most films are made by blowing air. The decree stipulates that the tube from the die is blown by compressed air, and the formed film bubble is blown and cooled by a wind ring, and then drained by a guide roller (or splint), and then curled into a roll to make a blown film. Many packaging bags and agricultural films use this method to manufacture cylindrical films, which are welded and cut.
Six, compound preparations
Use multiple extruders to supply a variety of plastics at the same time, and then extrude them through a common head to form an integrated composite product, which can produce a variety of composite films, composite sheets, plates, shapes, and tubes.
Seventh, melt spinning
During melt spinning, some resins with high viscosity are often extruded to melt the material. The molten material enters the spinneret directly through the filter, or is injected into the spinneret by a spinneret pump.
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