What Is Hot Melt Charring? How to Prevent Tank and Nozzle Problems
Hot melt carbonation or char is that the adhesive is thermal or oxidatively deteriorated in the tank and line and turns into dark, hard particles. These particles can fill the filter, disrupt the flow of nozzle and cause quality problems that extend to unplanned downtime.
How does carbonization occur?
The main mechanisms are over temperature, long thermal standby, air contact and contamination. The adhesive left in a thin film on hot surfaces of the tank can be broken faster than the product inside the mass. Continuously low retention of tank level can improve surface area and hot wall contact; oxygen and foreign material inlet make it easier if the cover remains open.
Symptoms are not only black particle
Color darkening, burn smell, shorting of filter change range, intermittent flow, irregular bead and nozzle blockage can be symptoms of carbonization. But the mixture of contamination or incompatible products can also produce similar residue. Therefore, the place of the residue removed during maintenance should be recorded in appearance and formation speed; it should be interpreted with the history of temperature and posture.
Preventive temperature and inventory management
Working in the temperature range recommended by the manufacturer, reducing the temperature in long postures and keeping the tank at the correct level is basic measures. Continuous new granules on the old product can escape the long time remaining material in the dead areas when adding. Planned tank control, convenient discharging-cleaning procedure and accurate FIFO stock approach reduce this risk.
Role of system design
A tank with a capacity above the need can lead to a long time of adhesive in low consumption. The excessive narrow nozzle or insufficient filter area converts small amount of char quickly into a visible failure. Capacity, actual hour consumption, melt rate, hose length and application pattern should be sized together.
Application control list
- Keep temperature in TDS range and verify actual value.
- Create temperature drop standard for long postures.
- Keep the tank cover off and prevent foreign material entry.
- Take filter and tank residues to photo care record.
- Match equipment capacity with real consumption.
Conclusion
Carbonization is not a single-point problem to be managed with regular nozzle cleaning. Heat load, air contact, tank use and filtration should be improved together.
Manstechnic approach
Manstechnic examines the tank-hortum-sector architecture and production postures not only adhesive in char problems.