PE pipe extrusion line operation instructions

                                               PE pipe extrusion line operation instructions

                                                      1. Preparation and drying of mixed ingredients

The batcher should strictly follow the formula in the production plan and should not mix rope ends, paper scraps, iron filings and other debris. Stir and dry strictly in accordance with the requirements of the process sheet.  

                                                2. Extrusion molding

1. Extruder tube blank extrusion

1.1 The pipe extrusion temperature refers to the following process temperature. now that:

a. The temperature of the blanking section is controlled within the range of 60--120℃;

b. The barrel temperature is controlled within the range of 180--200℃;

c. The machine head temperature is controlled within the range of 190--210℃;

d. The die temperature is controlled within the range of 200--220℃;

e. The melt temperature should generally not exceed 200℃

f. After shutdown and restarting, heating should be performed in stages; in the first stage, set the temperature of each zone to a difference of 50-60°C from the process temperature, and stabilize it for 60 minutes after full value for the second stage of heating. Set the temperature of each zone within the process temperature range, with the full value Then stabilize for 30 minutes.

1.2 Screw

a. The screw speed should match the production speed and meet the size requirements of the pipe. Torque must not be higher than 85%.

b. The barrel should be cleaned from time to time.

c. The extruder speed should be set to zero when starting up. The speed should be increased slowly during the host acceleration process. Pay close attention to the changes in the torque of the tube blank and the host to ensure the stability of the tube blank. It is strictly forbidden to exceed the torque limit.

1.3 Dimensions of die head and core mold

a. Select the mold strictly according to the actual production.

b. No material leakage is allowed during die production.

2 Vacuum sizing and cooling

2.1 The center of the vacuum sizing equipment must be consistent with the center line of the extruder;

2.2 The water quality is clean and free of particles and debris;

2.3 The sizing sleeve, vacuum box and cooling water tank should be thoroughly cleaned once a month to remove all kinds of debris;

2.4 The high-level water tank and the waterway to the sizing sleeve should be cleaned once a quarter, and strictly verified item by item according to the startup verification table:

a. Focus on checking whether the vacuum sizing tank supporting wheel and other rotating parts, water pumps, and vacuum pumps are working properly; b. The vacuum degree is adjusted between -0.06~0.015MPa according to different pipe specifications;

c. The PE pipe blank is extruded from the die head and enters the vacuum box through the sizing sleeve. The outer diameter, wall thickness and surface quality of the pipe are initially finalized. Therefore, the sizing sleeve must keep the waterway clear, free from blockage, and free from damage and debris on the surface. No air leakage;

d. The PE pipe blank needs to release a large amount of heat when it changes from a molten state to a solid state. Therefore, the cooling effect is directly related to the production efficiency and product performance. Adjust the amount of water according to molding to ensure stable molding and sufficient cooling.

3. Hual off and  cutting

Before starting the machine, check whether the traction machine of the cutting machine is normal, and adjust the hual off  and cutting machine according to the requirements of the pipe to ensure that the front and rear heights of the pipe are consistent and the cutting machine can cut smoothly.