المجموعات

• Rubber Extrusion Production Line-Tough, Unbreakable

  أعضاء ١

  Rubber Extrusion Production Line-Tough, Unbreakable
• Rubber Extrusion Production Line-What Suits Your Heart

  أعضاء ١

  Rubber Extrusion Production Line-What Suits Your Heart
• Process Requirements For Salt Bath Curing Lines

  أعضاء ١

  The mixing process of the salt bath curing line is divided into three stages, that is, the roll (softening stage with raw rubber added), eating powder (mixing stage with adding powder), and refining (after eating powder, the raw rubber and compounding agents are uniformly dispersed. Stage). The mixing of the open mill is different according to the type, use and performance of the rubber, and the process conditions are also different. During mixing, various factors such as the amount of glue added, the order of feeding, roll distance, roll temperature, mixing time, the speed and speed ratio of the roller, etc. should be paid attention to. It can neither be insufficiently kneaded nor over-kneaded. The mixer mixing is divided into three stages, namely wetting, dispersing and nirvana, and the mixer mixing stone is carried out under high temperature and pressure. The operation method is generally divided into a one-stage kneading method and a two-stage kneading method. The one-stage mixing method refers to a method in which the mixing is completed once by an internal mixer, and then compressed into tablets to obtain a mixed rubber. It is suitable for all natural rubber or rubber compounded with not more than 50% of synthetic rubber. In a mixing operation, batchwise stepwise feeding is often used. In order to prevent the rubber compound from rising sharply, slow mixing is generally used. The machine can also be a two-speed internal mixer. The temperature when adding sulfur must be lower than 100 ° C. Its feeding sequence is raw rubber—small material—reinforcing agent—filler—oil softener—discharging—cooling—adding sulfur and super accelerator. The two-stage kneading method refers to a method of mixing and tableting by an internal mixer twice to make a compound rubber. This method is suitable for rubber compounds with a synthetic rubber content exceeding 50%, and can avoid the disadvantages of long mixing time and high rubber temperature during a period of mixing process. The first-stage mixing is the same as the one-stage mixing method, except that vulcanization and a highly active accelerator are not added. After the first-stage mixing, the next sheet is cooled and left for a certain period of time, and then the second-stage mixing is performed. After mixing, the material is discharged to the tablet press, and then the vulcanizing agent is added. The step-by-step mixing method has a shorter rubber mixing time, lower mixing temperature, more uniform dispersion of the compounding agent, and high rubber quality.
• Working Principle Of Rubber Extruder Machine

  أعضاء ١

  The function of the rubber extruder machine is to use heat, pressure and shear to transform solid plastics into a uniform melt and send the melt to the next process. Melt production involves the mixing of additives such as color masterbatches, resin blending, and repulverization. The finished melt must be uniform in concentration and temperature. The pressure must be large enough to squeeze out the viscous polymer. The rubber extruder performs all the above processes through a barrel with a screw and a spiral. The plastic pellets enter the barrel through a real hopper of the barrel, and then are transferred to the other end of the barrel through the screw. In order to have sufficient pressure, the depth of the thread on the screw decreases as the interval to the hopper increases. External heating and internal heat generated by friction between the plastic and the screw soften and melt the plastic. Different polymers and different applications often have different requirements for the design of the extruder. Many options involve discharge ports, multiple feed ports, special mixing devices along the screw, cooling and heating of the melt, or no external heat source (heating extruder). The gap between the screw and barrel changes relatively. Size, and the number of screws. For example, a twin-screw extruder allows the melt to be more thoroughly mixed than a single-screw extruder. Tandem extrusion is the melt extruded by the first rubber extruder and used as the raw material for the second rubber extruder. It is usually used to produce extruded polyethylene foam. The characteristic dimensions of a rubber extruder are the diameter (D) of the screw and the ratio (L / D) of the length (L) to the diameter (D) of the screw. The extruder usually consists of at least three stages. The first section, near the feeding hopper, is the feeding section. Its function allows the material to enter the rubber extruder at a relatively stable rate. In general, in order to avoid blockage of the feeding channel, this part will be kept at a relatively low temperature. The second part is the compression section, where a melt is formed and the pressure increases. The transition from the feeding section to the compression section can be sudden or gradual (gradual). The last part of the metering section is next to the rubber extruder exit. The main function is that the material flowing out of the rubber extruder is uniform. In this part, to ensure the uniformity of composition and temperature, the material should have sufficient residence time. At the end of the barrel of the rubber extruder, the plastic melt exits the rubber extruder through a head. This rubber extruder head is designed to the ideal shape, and the extruded melt flow passes here. Another important part is the driving mechanism of the rubber extruder. It controls the rotation speed of the screw, which determines the output of the rubber extruder. The required power is determined by the viscosity (resistance to movement) of the polymer. The viscosity of the polymer depends on the temperature and the rate of activity, and it decreases with the increase of temperature and shear force. The rubber extruder is equipped with a screen, which can block impurities on the screen. To avoid downtime, the filters should be able to be replaced automatically. This is especially important when processing resins with impurities, such as recycled materials. The screw of the extruder is divided into the feeding section, the plasticizing and melting section, and the temperature is based on the plastic particle process parameters. The model is divided into 20, 36, 52, 65, 75, 95, 120, and 135 according to the screw diameter. After the plastic particles are heated, the original state is changed by the movement of the screw. There are many types, depending on the specific application. The capacity of the frequency conversion is proportional to the diameter of the screw, and then adjusted according to the different raw materials.
• The Role Of Rubber Extruder

  أعضاء ١

  Precautions for using rubber extruder Speaking of rubber extruders, I believe everyone is not unfamiliar. To be honest, rubber extruders are a basic equipment of the rubber industry and one of the key equipments that affect product quality. Important role. The development of foreign rubber extruders has experienced plunger-type extruder, screw-type hot-feed extruder, ordinary cold-feed extruder, main and auxiliary thread cold-feed extruder, cold-feed exhaust extrusion Machine, pin cold feed extruder, compound extruder and other stages. The rubber extruder is a rubber machine used to extrude treads, inner tubes, hoses and various rubber profiles. It is also used to cover cable and wire products. Common is the screw extruder. When it is working, the rubber compound is stirred, mixed, plasticized and compacted in the barrel by the rotation of the extrusion screw, then moved toward the head, and finally extruded from the mouth. Shaped products. For mechanical products, we have to use them in accordance with certain rules, otherwise some accidents will occur. 1. The extruder should run forward to avoid reversing. 2. Don't run on an empty stomach, you must heat the machine to feed. This can avoid sticking (shaft holding). 3. It is strictly forbidden to enter iron and other miscellaneous materials in the inlet and vent hole of the extruder to avoid causing accidents and affecting production. 4, safe power, grounding wire. Share from Hefeng Machinery. 5. When the machine is running, it is forbidden to touch the rotating parts such as the inlet, outlet, belt, and gear. 6. The machine should be filled with lubricant before use to avoid damage to the machine.