The heat shrink tubing manufacturing process mainly includes the following steps:
Mixed granulation: Weigh various raw materials according to the formula, use a high-speed mixer to mix them evenly, and then complete the granulation process through a granulator, cooling water tank, blow dryer and granulator. The key process parameters include main engine speed 1000-1400r/min, feeder speed 50-80r/min, body temperature 110-160℃, and head temperature 190-240℃.
Extrusion molding: It is completed by an extruder, cooling water tank, traction machine, tension machine and winder. The key process parameters include extrusion speed 20-50r/min, traction speed 30-50Hz, and extruder temperature 90-130℃.
Radiation cross-linking: Use an electron accelerator and a beam transmission device to irradiate the plastic pipe to make it cross-linked. The key process parameters include the speed control of the electron accelerator beam and the beam transmission device.
Expansion and shaping: Heat the radiation-crosslinked plastic pipe to a high elastic state and use an expander to expand it. The key process parameters include temperature 120-150℃, input speed 8-10Hz, pull-out speed 8-10Hz, and vacuum degree -0.06MPa.
Cooling and shaping: The expanded pipe is placed in a high temperature environment for shaping to ensure that it can shrink accurately during subsequent heating.
Inspection and cutting: The heat shrink tube that has been shaped is strictly inspected for size to ensure that it meets the predetermined standards and customer requirements, and then cut to the required length.
Packaging: The heat shrink tube that has passed the quality inspection is packaged in a standardized manner to ensure the quality of the product during transportation and storage.