Reasons for the unqualified PTFE rod: Rod diameter error, Irregular rod roundness, appearance of the product is rough and dull, There are bubbles or silver wires on the outside of the stick, Extrusion breakage and Not straight.
Rod diameter error:1. The rotation speed of the screw is not stable.2. The heating temperature of the barrel fluctuates.3. The filter screen at the porous plate is blocked.4. The traction speed is not stable. Irregular rod roundness:1. The temperature of the molding die fluctuates, and the temperature of the extrusion molding melt is stable.2. The screw is severely worn, and the extrusion melt pressure is not messy.3. The tractor is not running smoothly. The appearance of the product is rough and dull:1. The heating temperature of the barrel is low, and the plasticization of the material is uneven.2. The molding die temperature is low.3. The filter screen is broken, and there are many impurities in the quality guess.4. The inner and outer surface of the molding die or sizing sleeve is rough and the finish is not good.
There are bubbles or silver wires on the outside of the stick:1. The material is dry and disposes of different standards, and the quality guess is that the moisture content is high.2. The temperature of the heating barrel is too high. Extrusion breakage:1. Obstruction at the entrance of the feeding hopper2. The temperature in the feeding section of the barrel is too high.3. There are many impurities on the filter, which block the filter.4. The temperature of the forming mold is too low, and the resistance of the melt is large. Not straight:1. The temperature difference of each section of the die or sizing sleeve is too large.2. Uneven product cooling and shaping.3. The center line of auxiliary machine and extruder is not in a straight line.4. The inlet and outlet of the cooling water tank are not on the same axis as the die.5. The product does not sufficiently cool down.
Post time: Aug-05-2020