07-10
Gas assisted injection molding is a special injection molding technology developed on the basis of traditional thermoplastic injection molding technology, which is suitable for special performance req...
The extrusion of plastic sheet is quite common in the manufacturing sectors. It generated around 25% of the thermoplastics used in the industry, especially electronic industry.
When producing plastic sheet, melted polymer is pressed through a flat die in the extrusion process. CN Mould & Plastic Limited produces a range of high-quality thin sheets and has the ability to extrude the plastic sheet as thinnest as 0.1mm.
Thin extrusion process is similar to regular extrusion, with the exception that it is incredibly thin. Numerous different ploymers can be used in this technique. Materials of most plastic thin sheets extruded in CN Mould & Plastic Limited are TPE and PVC.
1. Prepartaion: Add the plastic raw materials, additives and color masterbatch required into the hopper of the extruder, then mix evenly into the screw area of the extruder.
2. Melting: In the screw zone of the extruder, the plastic raw material is heated, melted, and evenly mixed with additives and color masterbatches.
3. Extrusion: The plastic raw materials after melting are pushed into the mold, and the plastic raw materials are extruded into the shape of the desired product through the shape and size of the mold.
4. Cooling: After the product is finished in the mold, the product needs to be cooled.
5. Cutting: After the product is completely cooled, the product is cut into the required length by the cutting machine.
6. Winding: Use the winding machine for winding operation.
During the extrusion process, the following factors need to be taken into account:
1. Temperature
Typically, when extrusion molding, we also measure the temperatures of the plastic and screw in addition to the barrel's temperature. Temperature regulation is handled by the heating and cooling system. The quality of the products is impacted by the screw structure, unstable heating and cooling systems, fluctuating screw speed, and other factors that cause the temperature of the extrusion material to fluctuate in both the radial and axial directions. The various intensities of the components cause lingering stress and dull surfaces. To ensure product quality, the temperature must be stable.
2. Pressure
Due to the screw and barrel structure, the resistance of the head, filter, and filter plate, as well as other considerations, there is pressure inside the plastic.
3. Extrusion Rate
The quantity of plastic that an extruder die can create in a specific amount of time, either in length or volume. A number of factors, including as head resistance, screw and barrel construction, screw speed, heating and cooling system, and plastic characteristics, have an impact on extrusion rate. However, when the product is fixed, the extrusion rate and screw speed are merely connected. The extrusion rate is an additional factor that influences the product geometry and size. The screw and screw speed should be properly designed, the stability of the heating and cooling system should be well-controlled, and parameter fluctuations should be kept to a minimum in order to guarantee the quality of the items.
The cooling procedure for extruding films is less efficient than it is for a flat film. Flat film's temperature is lowered using water or chilling rollers. It may heat a place far more effectively than Thin Film Extrusion since it uses air.
It is difficult to properly control a thin film's thickness. It's a challenging process, and many things could go wrong. The intricate manufacturing technique allows for far higher rates of manufacture of thin film than blown film. Each of these types are frequently utilized in thin films.
There is a significant chance of air getting caught between the layers of the film and the rollers during Thin Film Extrusion, which might seriously disrupt the entire production process.
The newly produced films could thereafter need to be discarded or used in other ways since they may become wrinkled or scratched as a result. Usually, a vacuum is installed to avoid air entrapment.
