National Cable Quality Center: strictly control the qua…

　　A, wire extruders operate method

　　The operator must be familiar with the operation of their own to the wire extruder to structural features, in particular, to correctly grasp the screw to structural characteristics, heating and cooling control instrumentation features, characteristics and nose assembly and so, in order to properly grasp the extrusion process conditions, correctly operate the machine.

　　Extruded plastic products to different methods of operation are not all in the same manner, but also has its common. Below is a brief description of various products during extrusion same manner as in step and the operation should pay attention to the matter.

　　First, before the start of preparatory work.

　　(A) for the plastic extrusion molding. Raw materials should reach the required drying requirements, if necessary for further drying. Sieved to remove lumps and pellets of raw materials and mechanical impurities.

　　(2) Check the device in water, electricity, gas and all systems are normal, to ensure water, gas flow, no leakage, electrical system is normal, the heating system, temperature control, various instruments are reliable; auxiliary empty low-speed test operation, observe whether the device is working properly; start stereotypes vacuum pump, if observed working properly; slippery parts in a variety of equipment lubrication. If found fault immediately removed.

　　(3) installed head and calibrator. Depending on the product to the species, size, head size selected. In the following order will head installed.

　　① nose should fit together, the whole mounted on a wire extruder.

　　Before ② head assembly shall be painted to wipe grease when you save, if carefully examined cavity surface bumps, scratches, rust, make the necessary polish and then coated with silicone oil flow channel.

　　③ order will head each plate assembly together, bolt to the threads coated with high temperature grease, and then tighten the bolts and flange.

　　④ The porous plate is placed between the head flange, pressing the perforated plate to ensure that the material does not overflow.

　　⑤ without tightening the wire extruder head and fasten the coupling flange bolts should be adjusted to die before the horizontal position, can adjust the level of proposed horizontal square head, round head shape model places soled face as a benchmark by the nose die underside leveling.

　　⑥ tight connection flange bolts, tighten the head fastening bolts, installing heating coil and a thermocouple, pay attention to the heating coil and the outer surface of the head snapping.

　　⑦ install calibrator and adjust the position, check the host, setting sleeve and the tractor is aligned to the centerline. After adjustment, tighten the mounting bolts. Connecting pipes and tubes of each calibrator.

　　⑧ turn on the heating power of the nose, Jane uniform heat. Open at the bottom of the hopper and the gear box to the cooling water pump to the inlet and exhaust valves. When the heating temperature before heating paragraphs transferred 140 ℃, the time when the temperature rose to 140 ℃ insulation 30-40min, then the temperature rose to normal production temperature. When the temperature rose to normal production until the desired temperature, then keep about 10min, so that each part of the machine temperature to stabilize before they can start production. Insulation length of time depending on the model species extruders and plastic raw materials vary. Holding time to allow uniform temperature inside and outside the machine, so the instrument indicates the temperature has reached the required temperature, and the actual temperature are low, then if the material into the extruder the wires, because the actual temperature is too low, the melt viscosity of the material is too large, axial force will cause overload and damage the machine.

　　⑨ materials used to boot into the hopper, ready for use.

　　Stranding machines, wire extrusion machines, computer CD-ray machine, cutter machine, beam machine, wire and cable equipment, electronic wire production equipment, network cable production equipment

　　Second, to boot.

　　(1) After the thermostat to boot, before starting the extruder should head flange bolts and then tighten again to remove the bolt and head to the difference in thermal expansion, tighten the bolts to the order of the head of the corner tightened, forced to uniform. When tight head flange nuts, requires around elastic consistent, otherwise run material.

　　(2) boot, selected by "Prepare boot" button, followed by "Start" button, then slowly rotate the screw speed adjustment knob, screw speed slow start. Then gradually accelerate, while a small amount of feed. Pay close attention to the host ammeter and various instructions indicate changes in the header when feeding. Screw torque should not exceed Red Label (typically 65% -75% torque table). Before plastic profiles are extruded, no person shall stand in front of the die to prevent the bolts pulled off or put wet bulb due to reasons such raw materials to produce injury. Plastic extrusion die head from behind, it will take the extrudate to cool slowly and cited the traction device and stereotypes die and start these devices. Then according to the indicated value and control instrumentation for extrusion products require. Will be adjusted accordingly for each part, so that the entire extrusion operation reaches the normal state. And, if necessary add a little material, twin-screw extruder using wire feeder metering feeder evenly constant speed.

　　(3) When the die out of uniform and plastic material can be excellent traction good people calibrator. Plasticizing need to empirically determine the extent, generally based on the appearance of the extruded material to judge, that shiny surface, no impurities, no foam, coke material and color, hand out material squeezed down to a certain extent does not appear burrs, nicks, a certain flexibility, at this time shows good plasticizing material. If the poor plasticizing screw speed can be adjusted, and the cylinder head temperature, until the request.

　　(4) In the extrusion process, the process should require periodic inspection of various process parameters are normal, and fill process sheets. Check profiles by product quality inspection standards to quality, identify problems and take timely corrective measures.

　　Stranding machines, wire extrusion machines, computer CD-ray machine, cutter machine, beam machine, wire and cable equipment, electronic wire production equipment, network cable production equipment

　　Third, stop.

　　(1) stop feeding the wire plastic extruder Mainland burnishing, when exposed screw, barrel and head off the power, stop heating.

　　(2) Close extruders and auxiliary power supply, so that the screw and auxiliary stop.

　　(3) Heading coupling flanges, disassemble nose. To clean the perforated plate and the head to the various components. To prevent damage to the surface of the nose, the nose Mainland law residual material application steel, steel to clean up clean up, and then use sandpaper to adhere to the plastic nose grind except the Mainland and lighting, coated with oil or silicone oil rust.

　　(4) screw, barrel clean up, after removing the head, restart the host, plus downtime material (or broken material), cleaning screw, barrel, then screw selection of low-speed (sr / min or so) in order to reduce wear. Expected to be shut down completely out of the ground into powder, can of compressed air from the feed inlet and exhaust ports pellets and powder residue blown repeatedly, until the barrel is really no residual material, the screw speed down to zero, stop extrusion machine, shut off the main power supply and the cold water main valve.

　　(5) should pay attention to safety out of the project are: electricity, heat, turning and heavy machinery parts to loading and unloading. Must be equipped with lifting equipment, assembly and disassembly head screw extruder and other bulky parts between, in order to ensure safety in production.

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