Different granulators can be designed and manufactured according to the special requirements of the size, shape, quantity and type of plastic trim. The number and design of the dicing knives, as well as the granulator speed, rotor type and screen size, are critical to obtaining high quality scrap recycled products. The granulator should be placed next to or below the plastics making machine or placed in the center to handle several plastic machine trims. Therefore, it is best to choose the granulator reasonably according to the type and position of the scrap to be processed. Depending on the application, such as film, profile, pipe and sheet, the extruder can use a machine-side granulator or a central granulator.
For automatic injection molding and tandem thermoforming, the use of press granulators is more common. The sprue residue in the injection molding process falls into the granulator, and the products are collected and sent to the central area for packaging by a conveyor belt. The thermoforming granulator is located under the edger and removes the frame material remaining after the part is punched out. The frame material enters the granulator and the parts are sent to the packing station.
The central granulator generally has a large volume and the motor power is usually 55kw, which is suitable for pipes, films, plates and large parts.
Unlike the trimmed trim, the trim for cyclic granulation must meet the more stringent requirements. If the size of the scrap is too large, it will cause the throat of the extruder to clog, or the melt will be too slow to reduce the amount of extrusion. However, if the size of the scrap is too small, it will cause the melt to be too fast, resulting in thermal degradation. The size of the recycled material must be uniform to ensure melting at a constant rate within the extruder. Not all thermoplastic trim can be recycled and regranulated. Some lighter materials, such as thermoformed sheet crimps, must be compacted by off-line regranulation prior to mixing with other neat resins.
The power of the granulator ranges from 0.37 to 735.5 kw, but they all work in a similar way. The cutter mounted on the rotor (rotating speed between approximately 400 and 700 r/min) is moved relative to the fixed cutter mounted on the outer circumference of the cutting material. The granulator generally has 1 to 6 fixed cutters, and the number of rotary cutters can be up to 32 depending on the rotor. The granulator used was equipped with a strainer under the fixed cutter. The screen passes the regrind of the desired size and leaves a large regrind until they are cut to a sufficiently small size within the cut chamber.
The auxiliary equipment of the granulator has a hopper that prevents the trimming from flying back and a vacuum cleaner. Although the trimming back (the scrap back from the hopper) cannot be completely stopped, the specially designed hopper minimizes the backhaul.
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