SJ-90, 120 letter granulator

SJ-90, 120 letter granulator: The main machine of the plastic granulator is the extruder, which is composed of the extrusion system, the transmission system and the heating and cooling system.

1, extrusion system Extrusion system includes screw, barrel, hopper, head, and mold, plastic through the extrusion system and molded into a uniform melt, and in the process to establish the pressure, the screw continuous extrusion head.

(1) Screw: it is the most important component of the extruder, which is directly related to the application range and productivity of the extruder, and is made of high-strength corrosion-resistant alloy steel.

(2) Barrel: It is a metal cylinder, generally made of alloy steel with high heat resistance, high pressure strength, strong wear resistance, corrosion resistance or composite steel pipe lined with alloy steel. The barrel is matched with the screw to achieve the crushing, softening, melting, plasticizing, venting and compacting of plastics, and the continuous and uniform delivery of 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 into principle.

(3) Hopper: The bottom of the hopper is equipped with a cut-off device to adjust and cut off the material flow, and the side of the hopper is equipped with a viewing hole and a calibration measuring device.

(4) Head and mold: the head is composed of alloy steel inner sleeve and carbon steel jacket, and the head is equipped with forming mold. The role of the head is to transform the rotating motion of the plastic melt into a parallel linear motion, uniform and smooth into the mold sleeve, and give the plastic with the necessary molding pressure. The plastic is plasticized and compacted in the barrel, and flows into the head molding mold through the neck of the head along a certain flow channel through the porous filter plate. The mold core and mold sleeve are properly matched to form a ring gap with decreasing cross section, so that the plastic melt forms a continuous dense tubular coating layer around the core wire. In order to ensure that the plastic flow path in the head is reasonable and eliminate the dead Angle of the accumulated plastic, a shunt sleeve is often placed, and a pressure equalizing ring is also set to eliminate the pressure fluctuation when the plastic is extruded. The head is also equipped with a mold correction and adjustment device, which is convenient to adjust and correct the concentricity of the mold core and the mold sleeve.

Extrusion machine according to the head material flow direction and the Angle of the screw center line, the head is divided into oblique head (Angle 120o) and right Angle head. The shell of the head is fixed on the fuselage with bolts, the mold inside the head has a mold core seat, and the screw is fixed on the head wire entry port, the front of the mold core seat is equipped with a mold core, the center of the mold core and the mold core seat has a hole for passing the core wire; A pressure balancing ring is arranged in the front of the machine head to balance the pressure; The extrusion forming part is composed of a mold sleeve seat and a mold sleeve, and the position of the mold sleeve can be adjusted by the bolt through the support to adjust the relative position of the mold sleeve to the mold core, which is convenient to adjust the uniformity of the thickness of the extrusion cladding. A heating device and a temperature measuring device are installed outside the head.

2, the role of the transmission system is to drive the screw, supply the torque and speed required by the screw in the extrusion process, usually composed of a motor, a reducer and bearings. Heating and cooling device Heating and cooling are necessary conditions for the plastic extrusion process to be able to proceed.

(1) Now the extruder usually uses electric heating, which is divided into resistance heating and induction heating, and the heating sheet is installed in the fuselage, neck and head parts. The heating device heats the plastic inside the cylinder externally to reach the temperature required for the process operation.

(2) The cooling device is set to ensure that the plastic is in the temperature range required by the process. Specifically, it is to eliminate the excess heat generated by the shear friction of the screw rotation to avoid the high temperature that makes the plastic decomposition, scorching or styling difficult. Cylinder cooling is divided into water cooling and air cooling two kinds, generally small and medium-sized extruder using air cooling is more suitable, large use water cooling or two forms of combined cooling; Screw cooling mainly uses central water cooling, the purpose is to increase the solid conveying rate of materials, stabilize the amount of glue, and improve product quality; However, the cooling at the hopper is to strengthen the conveying effect of solid materials, prevent the plastic particles from sticking and blocking the material port due to temperature rise, and ensure the normal work of the transmission part.

3, the auxiliary machinery of the plastic granulation unit mainly includes pay-off device, straightening device, preheating device, cooling device, traction device, meter meter, spark testing machine, take-up device. The use of extruder units is different and the auxiliary equipment selected is not the same. Such as cutters, blow-dryers, printing devices, etc.

4, straightening device: one of the most common types of plastic extrusion waste is eccentric, and various types of bending of the core is one of the important reasons for insulation eccentricity. In sheath extrusion, scratches on the surface of the sheath are often caused by the bending of the cable core. Therefore, straightening devices in various extruder groups are essential. The main types of straightening devices are: drum type (divided into horizontal type and vertical type); Pulley type (divided into single pulley and block); Helical wheel type, which also plays a variety of roles such as dragging, straightening and stabilizing tension; Pressure wheel type (divided into horizontal and vertical) and so on.

5, preheating device: cable core preheating is necessary for insulation extrusion and sheath extrusion. For the insulation layer, especially the thin layer insulation, the existence of pores cannot be allowed, and the water and oil on the surface of the wire core can be completely removed by preheating at high temperature before squeezing. For sheath extrusion, its main function is to dry the cable core and prevent the possibility of porosity in the sheath due to the action of moisture (or moisture surrounding the cushion). Preheating can also prevent the role of residual internal pressure of the plastic in the extrusion due to sudden cooling. In the process of extrusion, preheating can eliminate the difference in temperature between the cold line entering the high temperature head and the plastic contact at the die mouth, so as to avoid the fluctuation of the extrusion pressure caused by the fluctuation of the plastic temperature, so as to stabilize the extrusion amount and ensure the extrusion quality. The electric heating core preheating device is used in the extruder group, which requires sufficient capacity and rapid heating, so that the core preheating and the drying efficiency of the cable core are high. The preheating temperature is limited by the pay-off speed, and is generally similar to the head temperature.

6, cooling device: The formed plastic extruded coating should be cooled immediately after leaving the head, otherwise it will be deformed under the action of gravity. The way of cooling is usually water cooling, and according to different water temperatures, it is divided into urgent cooling and slow cooling. Quench cooling is the direct cooling of cold water, quench cooling is beneficial to the molding of plastic extruded cladding, but for crystalline polymers, due to quench cooling, it is easy to residual internal stress inside the extruded cladding organization, resulting in cracking during use, generally PVC plastic layer is quench cooling. Slow cooling is to reduce the internal stress of the product, in the cooling tank sections placed different temperatures of water, so that the product gradually cooling set, PE, PP extrusion is carried out by slow cooling, that is, through hot water, warm water, cold water three stages of cooling.

7, plastic granulator - Functional use: the use of special screw design and different configurations, suitable for the production of PP, PE, PS, ABS, PA, PVC, PC, POM, EVA, LCP, PET, PMMA and other plastic regeneration and mixed color granulation. The reducer adopts the design of high torque, which realizes the performance of smooth running without noise. Screw, barrel after special hardening treatment, with wear-resistant, mixing performance, high yield characteristics, vacuum exhaust or ordinary exhaust port design, can be in the production process of water, exhaust gas away, more stable material, more solid colloidal particles, to ensure the good quality of products.

8, plastic granulator is mainly used for processing waste plastic film (industrial packaging film, agricultural mulching film, greenhouse film, beer bags, handbags, etc.), woven bags, agricultural convenient bags, POTS, buckets, beverage bottles, furniture, daily supplies, etc., suitable for most common waste plastics, waste plastic recycling industry is the most widely used, the most widely used, The most popular plastic recycling processing machinery.

Plastic granulator - Plastic granulator features

1. All recycled materials can be produced without drying or drying after classification and crushing and cleaning, and can be used both dry and wet.

2, from raw material crushing, cleaning, feeding to made particles are automated.

3, make full use of high pressure friction uninterrupted heating system, automatic heating production, avoid continuous heating, energy saving.

4, the use of split automatic power distribution system to ensure the safe and normal operation of the motor.

5, screw barrel are made of imported high-strength high-quality carbon structural steel, durable.

6, the machine appearance is beautiful and generous. Can match the color and spray paint according to customer requirements.