65 extruder operation procedures

Plastics extrusion line, various types of products has its operating characteristics, has a detailed understanding of its operating characteristics, can give full play to the efficiency of the machine, this paper, the research of precision instrument will point to the operation of the plastic extrusion machine, preventive maintenance and make a brief.

The grind precision instruments, points out that the plastic extrusion machine operators must be familiar with their operation by the characteristics of the structure of the equipment and related especially must correctly grasp the structural characteristics of the screw, heating and cooling characteristics of control instrument, the nose and assembly, etc., in order to correctly grasp the extrusion processing conditions, operating equipment correctly. In addition,

A, the preparation before driving

(1) for extrusion molding of plastics. Raw materials should meet the needs of dry, dry further as needed. And to remove material sieving agglomerate crumb and mechanical impurities.

(2) inspection equipment, water, electricity, gas system is normal, ensure smooth water, gas path, do not leak, electrical system is normal, temperature control, heating system, all kinds of instrument is reliable; Auxiliary empty test run at low speed, observe whether equipment is working properly; Start calibrating bench vacuum pump, observe whether work properly; In all sorts of equipment lubrication oil lubrication. If discover fault in time.

(3) the machine head and finalize the design. According to the product variety, size, choose the right head specifications. In the following order will head installed.

Second, the driving

(1) after the constant temperature can drive a car, before driving the nose, as well as 65 extruder flange bolts shall be tightened again, in order to eliminate the differences in thermal expansion bolt and the nose, the order of the head bolt is diagonal tightened, the strength should be uniform. Tightness around the head flange nut, request, or you'll run.

(2) to drive a car, choose "ready to drive" button, then the "drive" button, then slowly rotating the screw rotation speed adjusting knob, the screw rotation speed slow start. Then gradually accelerated, a small amount of material at the same time. Please pay close attention to the host when feeding current meter and various instructions header indicating changes. Screw torque should not exceed the red mark (generally sixty-five percent to seventy-five percent for torque table) plastic material before being squeezed out, no one may stand in the front mouth mold, in order to prevent the bolt tensile or put bubble by the damp raw material and other reasons, resulting in injury accident. After the plastic mouth from the mold, the need to bring the extrudate slowly cooled and onto traction device and finalize the design mode, and start the installation. Then according to the indicated value of control instrument as well as the requirements for the product. Adjust the parts accordingly, in order to make the whole extrusion to normal operation. And according to the need to add sufficient material, the double screw extrusion machine adopts metering feeder evenly uniform loading.

(3) a time plastic mold discharging uniform and fine good traction can be finalize the set. Plasticizing degree of judgment by experience, generally can be judged by the appearance of the extrusion materials, namely, surface luster, without impurities, no foam, coke and discoloration, extrusion materials by hand to squeeze fine to a certain extent without burr, fissure, have certain elasticity, show material plasticizing order at this time. If poor plasticizing can adjust the screw speed, barrel temperature and the nose, until meet the requirements.

(4) in the process of extrusion production, should be periodically checked according to the technological requirements of various process parameters is normal, and fill in the record sheet process. According to the quality of the product quality inspection standards inspection profile, found that the problem timely measures to solve them.

Three, parking

(1) stop charging, within 65 extruder will squeeze the light, showing the screw, close the barrel and the nose the power and stop heating.

(2) close the plastic extrusion machine and auxiliary power supply, make the screw and the auxiliary machine stop running.

(3) open the head connecting flange, remove the nose. The perforated plate and the nose of the various components. During cleaning to prevent damaged surface in the nose, the nose residual material law of steel, the application of sheet steel to clean up, and then use sand paper to stick in the head of plastic grinding, and polishing, coated with oil or silicone oil rust.

(4) the screw, barrel cleaning, remove the head after the restart the host, and stop (or broken material), cleaning the screw and barrel, screw at this time to choose low speed (sr/min or so) to reduce wear and tear. Stay parking material after crushed into powder extrusion is complete, the available compressed air from the loading port, vent repeatedly blow out residue pellet and powder, only after the barrel did no residual material in the screw rotation speed reduction to zero, stop the extruder, shut off the main power and the cold water total valve.

(5) plastic extruder during extrusion should pay attention to the safety of the project are: the rotation of the electrical, thermal, mechanical, and loading and unloading of heavy components, etc. Extrusion between motorcycle must be equipped with lifting equipment, the nose, screw, such as heavy components, installation to ensure safety in production.