Causes of Hot Melt Nozzle Blockages and How to Prevent Them
Nozzle blockage is often not the problem of the only nozzle. The char formed in the tank, packing or powder contamination, improper temperature, damaged filter and adhesive compatibility throughout the system is one of the most narrow point. Permanent solution is to find where the thread occurred before opening the clogged tip.
Most often seen root causes
Keeping the adhesive at high temperature for an extended period, leaving the tank lid open and thereby increasing oxygen exposure, or allowing foreign material into the tank can accelerate charring. Mixing hot melt adhesives with different chemistries can also create unexpected residue. An incorrect mesh size or a poorly maintained filter may also allow particles to reach the hose and nozzle.
Take low flow with strain
Not every low flow. The heater failure can also provide similar specification of low-season temperature, insufficient melt rate, high viscosity, pump wear or pressure adjustment. Safely made gram/daka measurement, temperature control and filter inspection help to separate the source of the problem. It can hide the problem of unnecessary enlargement of the nozzle and improve consumption.
Cleaning and maintenance approach
Maintenance period not only according to the calendar; it should be determined according to the thermal stability of the adhesive, daily working time and posture habits. The tank cover should be kept closed, the packaging parts should be avoided inside during the filling and the filters must be renewed in controlled form. Instead of growing orifisi with metal wire or drill, the cleaning and part changing method of the manufacturer is applied.
Collect data in repeating blockage
Time to stretch, the product used is lotu, tank level, temperature, downtime and save the replaced part. The color and structure of the particle that comes in the nozzle also gives hint: black-kırılgan parts can suggest thermal degradation, foreign fiber or carton parts external contamination. Based on the data, the symptom reacts to the root cause solution from the recurrent maintenance intervention.
Application control list
- Cover the tank cover and keep the filling area clean.
- Plan filter maintenance according to production intensity.
- Verify Zon temperatures with calibrated method.
- Do not mix different adhesives without verification.
- Save downtime with lot, temperature and downtime.
Conclusion
System cleaning, temperature management, accurate filtration and correct product should be controlled together to prevent nozzle clogging. Changing only nozzle is often temporary solution.
Manstechnic approach
Manstechnic develops maintenance range and consumables proposal by examining repeating blockage in product-equipment-proses triangle.