Plastic granulator introduction

    The main body of the plastic granulator is an extruder, which is composed of an extrusion system, a transmission system and a heating and cooling system. Vigorously develop renewable resources and turn waste into treasure. Our main production is plastic recycling and washing equipment, crusher, water cooling granulator, air cooling granulator, water ring granulator and other plastic recycling and granulating equipment.

⒈Extrusion system

    The extrusion system includes a hopper and a head. The plastic is plasticized into a uniform melt through the extrusion system, and under the pressure established in this process, the screw is continuously extruded from the head.

    ⑴ Screw: It is the most important part of the extruder. It is directly related to the application range and productivity of the extruder and is made of high-strength corrosion-resistant alloy steel.

    ⑵ Barrel: It is a metal cylinder, generally made of alloy steel or composite steel pipe lined with alloy steel lined with heat resistance, high compressive strength, strong wear resistance and corrosion resistance. The barrel cooperates with the screw to realize the crushing, softening, melting, plasticizing, exhausting and compacting of the plastic, and continuously and evenly transport the rubber material to the molding system. Generally, the length of the barrel is 15 to 30 times its diameter, so that the plastic is fully heated and fully plasticized.

    ⑶ Hopper: The bottom of the hopper is equipped with a cutting device to adjust and cut off the material flow, and the side of the hopper is equipped with a sight hole and a calibration metering device.

    ⑷Head and mold: the head is composed of an alloy steel inner sleeve and a carbon steel outer sleeve, and the head is equipped with a forming mold. The function of the machine head is to transform the plastic melt in rotary motion into parallel linear motion, which is evenly and smoothly introduced into the mold sleeve and gives the plastic the necessary molding pressure. The plastic is plasticized and compacted in the barrel, and flows into the die forming mold through the neck of the nose through the porous filter plate along a certain flow channel. A continuous and dense tubular coating is formed around the core wire. In order to ensure that the plastic flow channel in the machine head is reasonable and eliminate the dead corner of the accumulated plastic, a shunt sleeve is often arranged. In order to eliminate the pressure fluctuation during plastic extrusion, there are also pressure equalizing rings. The machine head is also equipped with a mold correction and adjustment device, which is convenient for adjusting and correcting the concentricity of the mold core and the mold sleeve.

2. Transmission system

     The role of the transmission system is to drive the screw. The torque and speed required for the screw during the extrusion process are usually composed of motors, reducers and bearings.

⒊Heating and cooling device

    Heating and cooling are necessary conditions for the plastic extrusion process.

    (1) In 2013, extruders usually use electric heating, which is divided into resistance heating and induction heating. The heating plates are installed in the body, neck and head. The heating device externally heats the plastic in the cylinder to make it warm up to reach the temperature required for the process operation.

    ⑵The cooling device is set to ensure that the plastic is within the temperature range required by the process. Specifically, in order to eliminate the excessive heat generated by the shear friction of the screw rotation, to avoid the temperature being too high to cause the plastic to decompose, scorch, or set the difficulty. Barrel cooling is divided into water cooling and air cooling. Generally, small and medium-sized extruders are more suitable for air cooling, and large ones are mostly water cooling or a combination of two forms of cooling; screw cooling mainly uses central water cooling, the purpose is to increase the rate of solid transport , Stabilize the amount of glue, and improve the quality of the product; but the cooling at the hopper is to strengthen the conveyance of solid materials and prevent the plastic particles from sticking and blocking the material opening due to temperature rise.

    Plastic granulators are mainly used for processing waste plastic films (industrial packaging films, agricultural mulch films, greenhouse films, beer bags, handbags, etc.), woven bags, agricultural convenient bags, pots, barrels, beverage bottles, furniture, daily necessities, etc. It is suitable for most common waste plastics. It is the most widely used, widely used and most popular plastic recycling processing machinery in the waste plastics recycling industry.

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