Today, waste utilization is very important, and conservation advocates require plastics manufacturers to reuse all their products. Therefore, manufacturers have no choice but to reprocess the discarded parts and scraps through a plastic granulator. This process can reduce product costs and increase resin utilization. Even many municipalities use plastic granulators and shredders to sell plastic trim to plastics manufacturers to compensate for the cost of landfill disposal. The broken plastic granulator can rework the thermoplastic trim and granulate the material to the appropriate size. Many thermoset plastic and synthetic material manufacturers also use plastic granulators for scrap processing and reprocessing. Rotor: The type of rotor is open, closed and spiral. The open type is mainly used in general use, the closed type is suitable for central applications, and the spiral type is suitable for engineering plastics. 1. The open rotor draws air into the particle chamber, which helps to clean up the residual material in the cutting chamber, transports the scrap to the screen and passes it, and cools the plastic pelletizer. Overheated plastic granulators will soften the plastic causing blockages and product degradation. When the trim is fed into the plastic granulator by air, an open rotor is typically required to pass air through the machine. 2. The enclosed rotor is more rugged, so it can withstand greater shock loads. Open rotors are typically used for extrusion and injection molding of trim, while closed rotors can be used for granulation of central grinding systems and thick cross-sections. 3. Spiral rotors and other special rotors, such as convoluted parabolic rotors, combine the robustness of a closed rotor with the air suction of an open rotor. When using a plastic granulator to process thick materials and remove waste, the effects of high impact loads on the bearings and transmissions should be considered. In order to improve the service life of plastic granulators, most large plastic granulators use 227-681 kg flywheels to reduce impact loads and reduce failures. Because of the high quality of the enclosed rotor, it also has some flywheel devices. Cutter: A typical plastic granulator has two or three cutters mounted on the rotor and one or two fixed cutters with a mounting angle of 180o. However, some models of plastic granulators have 30 or more cutters on their rotors. The purpose of the cutter is to ensure uniform stress on the transmission and to reduce the frequency of changing the cutter. Shredder: In order to extend equipment life and reduce power requirements, many manufacturers use two-stage granulation to treat large chunks of recycled material. The first step of the two-stage granulation process typically uses a shredder to cut the bulk trim into smaller sizes and then feed the trim into the plastic granulator. The shredder requires very little power compared to a correspondingly sized plastic granulator and avoids the stress problems often encountered with expensive high power plastic granulators when processing large pieces of trim. Recycled film rolls, large extruded profiles and tubing, as well as difficult-to-handle materials, often require the use of a shredder for handling to facilitate granulation. The power required by the plastic granulator is proportional to the amount of extrusion and is exponential with the size of the screen. For example, a plastic granulator with a 4.76mm filter at the same output requires three times the power of a 9.52mm filter. Equipment: Different plastic 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 pelletizers, as well as the rotational speed of the plastic pelletizer, rotor type and screen size, are critical to obtaining high quality scrap recycled products. The plastic granulator should be placed next to or below the plastics making machine or placed in the center to handle several plastics manufacturing machine trim. Therefore, it is best to choose a plastic granulator 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 plastic granulator or a central plastic granulator. For automatic injection molding and tandem thermoforming, the use of press-type plastic granulators is more common. The sprue residue in the injection molding process falls into the plastic granulator, and the products are collected and sent to the central area for packaging by a conveyor belt. The thermoformed plastic granulator is located under the edger and removes the frame material remaining after the part is punched out. The frame material enters the plastic granulator and the parts are sent to the packaging station. The central plastic 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, the melting will be too fast, resulting in thermal degradation. The size of the recycled material must be uniform to ensure melting at a constant rate in 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 before they are mixed with other pure resins. Plastic granulators range in power from 0.37 to 735.5 kW, but they all work in a similar way. The cutter mounted on the rotor (rotating speed between about 400 and 700 r/min) moves relative to the fixed cutter mounted on the outer circumference of the cutting material. Plastic granulators generally have 1 to 6 fixed cutters, and the number of rotary cutters can be up to 32 depending on the rotor. The plastic granulators used were fitted with screens under the fixed cutters. 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 plastic granulator's auxiliary equipment has a hopper that reduces the noise to the OSHA requirements, and the anti-trimming material returns to the hopper. Although the trimming back (the scrap back from the hopper) cannot be completely stopped, the specially designed hopper minimizes the backhaul. Cooling Tower,Chiller Tower,Chiller Cooling Tower,Small Cooling Tower HEBEI DONGDING CHEMICAL TRADE CO.,LTD , https://www.chopctfrp.com