Hot Melt Coating Machine Maintenance Schedule (For Trasy Enterprises Machines)

Clean coating head & tank

Remove residual adhesive from melter, slot die/nozzle, filters & rollers using recommended cleaning tools or solvent.

Prevent adhesive carbonization & nozzle blockage.

Check temperature readings

Compare set temperature vs. actual on all zones (tank, hose, die).

Maintain correct viscosity & coating quality.

Inspect hoses & fittings

Look for leaks, cracks, or exposed wires.

Prevent adhesive leakage & safety hazards.

Lubricate moving parts (lightly)

Apply thin oil film on exposed shafts, guide rods, or chains (if dry).

Reduce wear & ensure smooth motion.

Check web path alignment

Verify substrate runs straight through coating head.

Avoid coating unevenness & web damage.

Record machine log

Note production run time, grade of adhesive used, temperature, any anomalies.

Build preventive maintenance history.

Test heater zones & thermocouples

Measure response times, verify correct temperature calibration.

Ensure uniform heating & process stability.

Safety system inspection

Check E-stop, limit switches, thermal cut-offs, guards & alarms.

Operator safety.

Check coating width & die lips alignment

Inspect for uniformity of coating layer. Clean die lips thoroughly.

Maintain coating precision.

Grease bearings & mechanical joints

Use manufacturer-recommended grease.

Prevent bearing wear & noise.

Review operating log

Analyze temperature trends, downtime causes, and plan improvements.

Preventive maintenance planning.

Adhesive compatibility check

Inspect tank & hoses for residue or reaction with adhesive type.

Avoid material degradation.

Complete system calibration

Calibrate all heaters, sensors, pressure gauges, and load cells.

Ensure long-term precision.

Overhaul of mechanical assemblies

Inspect and recondition coating head, rollers, and frame.

Restore machine to factory performance.

Software / PLC check & backup

Update firmware or PLC logic if necessary. Backup parameters.

Maintain control reliability.

Motor & gearbox inspection

Check motor amperage, vibration, and gearbox oil (if applicable).

Ensure power transmission efficiency.

Roller & coating head alignment check

Verify parallelism using alignment tools.

Prevent coating streaks & uneven layers.

Inspect control panel

Clean, tighten, and calibrate sensors, PID, and PLC.

Stable control & communication.

Replace worn parts

Replace seals, nozzles, filters, and gaskets.

Prevent leaks & maintain quality.