Polypropylene granulation test questions

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Exam Questions A for the 200,000-ton Pelletizing Position Name————— Score————— Fill-in-the-blank questions (2 points each, 20 points in total): 1. The motor torque of the disk turning mechanism must be less than ( ) before the main motor can be started. 2. The clutch disengages when the main motor torque is less than ( ) ( ). 3. The clutch disengages when the gearbox lubrication pressure is less than ( ) bar. 4. The melt pressure in zone 4 is greater than ( ) MPa, the melt pressure in zone 6 is greater than ( ) MPa, and the pressure difference before and after the mesh changer is greater than ( ) MPa; once any of these pressures is reached, the clutch disengages. 5. The screw speed is high at ( ) rpm, and low at ( ) rpm. 6. ( ) is introduced into the jacket of the mesh changer slider body. 7. While driving, the template temperature TI40901 must be ≥ ( ) °C. 8. During normal production, the particle water temperature TI50601 is ( ) °C. 9. The PH value of DW during knife sharpening with the press should be between ( ). 10. When the throttle valve is closed, the mixing degree of the material ( ). Multiple-choice questions (1 point per question, 10 points in total): 1. The PP grade T30S is: ( ) A) Homopolymer B) Random copolymer C) Block copolymer D) Coated material 2. The power of the main motor of the extrusion granulator is: ( ) A) 6000 KW B) 7000 KW C) 7700 KW D) 8000 KW 3. The number of times the main motor can be started continuously when it is cold is: ( ) A) 2 times B) 3 times C) 4 times D) 5 times 4. The filter screen of the extruder must be replaced during the ( ) process. A) Parking B) Heating C) Starting D) Maintenance 5. The flow rate of particle water should be greater than ( ) A) 300 m3/h B) 400 m3/h C) 500 m3/h D) 600 m3/h 6. ( ) is used as the conveying medium for powder transportation. A) Air B) Nitrogen C) Instrument air D) Hydrogen 7. The particulate matter in the wastewater tank mainly comes from ( ). A) D-856 overflow B) Drainage from the granulation chamber during shutdown C) Discharging material D) Drainage from the particle tank 8. Extruder screw ( ). A) Rotating in opposite directions B) Rotating in the same direction C) Rotating upward relative to each other D) Rotating downward relative to each other 9. During operation, the die holes of the extrusion granulator should be kept ( ). A) Porosity B) Temperature C) Lubrication D) Cleaning 10. If the die holes of an extrusion granulator become blocked during operation, what should be done? A) Stop the machine for cleaning B) Increase water flow rate C) Raise the temperature of the template D) Increase the pressure on the template. True or False questions (1 point per question, 10 points in total): 1. The \"five fixed principles\" for equipment lubrication are fixed location, fixed quality, fixed quantity, fixed frequency, and fixed person in charge. 2. The set pressure of the safety valve shall not exceed the maximum operating pressure, and the safety valve that has been inspected shall be sealed with a lead seal. 3. Equipment used to transport gases and increase gas pressure is divided into fans, blowers, and compressors. 4. The power of the granulator decreases as the melt index increases, and the higher the melt index, the greater its viscosity. 5. The interlock value of 115 for the granulator main unit is based on the fact that this interlock value represents 115% of the power under normal operating conditions. 6. During normal production, the screw speed of the extruder is 1480 rpm. 7. A high-speed centrifugal pump consists of three components: a motor, a speed increaser, and a pump, with the speed increaser and the pump generally being in a sealed structure. 8. The purpose of the drain is to remove condensate water to maintain temperature. 9. Oil-free piston compressors do not require lubrication. 10. A compressor is a machine that compresses gases, increases their pressure, or transports them. Short-answer questions (8 points each, 40 points in total): 1. Describe the steps for heating an extruder. 2. How should water-related problems with pellets be handled? 3. What are the reasons for the high PDI8102 value and how to address it? 4. What is the role of granulation water? 5. What are the reasons for excessive current in the pelletizer? Calculation question, 10 points: Given that the formula for the T30S additive is: Antioxidant 168: Antioxidant 1010: Calcium stearate = 900:450:450 (in ppm). If the production capacity of polypropylene is 25 tons per hour, how many kilograms are there of each type of additive? Drawing question: 10 points – Flowchart of the particulate water system