How to Clean Hot Melt Tank and Nozzle?
Hot melt system; After the power is safely cut off, the pressure is relieved and the tank is brought to the appropriate temperature range according to the manufacturer's instructions, the tank, filter and nozzle are cleaned respectively. The cleaning or washing agent used must be compatible with the existing adhesive and equipment.
Irregular grammage, cut glue marks, nozzle deviation and increase in filter pressure in hot melt application are often not only related to product selection. Glue left in the tank for long periods of time, extreme temperatures and unplanned downtime can accelerate carbonation. For this reason, cleaning is not a process performed after a malfunction; It is part of the controlled maintenance plan.
When is cleaning needed?
Shortening of the filter change interval, separation of nozzle flow rates, formation of dark residue on the tank surface, or persistence of color and viscosity marks after product change may indicate the need for cleaning. However, the decision to intervene should not be made based solely on visual findings; Pressure, temperature and consumption records should be evaluated together.
Safe maintenance order
- Plan line stop and follow machine manufacturer's lockout/tagout procedure.
- Relieve system pressure safely according to manufacturer's instructions.
- Release remaining adhesive in a controlled manner at appropriate operating temperature.
- Remove residue from tank and filter with means that do not damage equipment.
- Flush hoses and nozzles only with approved method and agent.
- Leak, pressure before recommissioning. and check for traces of glue.
Flammable solvents, open flames or scrapers not recommended by the equipment manufacturer should not be used. Occupational safety data sheet, personal protective equipment and waste management conditions must be verified separately in each business.
Cleaner and washing agent selection
Cleaning cold equipment parts and washing the hot melting unit are not the same process. You can examine the products with separated usage purposes in the Cleaning and Washing Agents section. For example, Jowat 402.40 for cold cleaning approach; Jowat 930.74, Jowat 930.84 and Jowat 930.94 can be used to compare washing options in line with the relevant TDS and equipment conditions.
Fault symptom and possible cause
| Symptom | Check first | Verification |
|---|---|---|
| Cut glue mark | Nozzle and filter clogging | Flow and pressure comparison |
| Dark residue | Waiting time and temperature | Tank temperature record |
| Mixing on product changeover | Inadequate drain/flush | Outlet display and sample |
Maintenance record list
In busy production regions such as Istanbul, Kocaeli, Bursa, Izmir and Tekirdağ, shift and shipment pressure may shorten maintenance time. However, the date, agent used, filter condition, nozzle control and first production sample should be recorded. Thus, maintenance frequency can be arranged according to actual process data, not a calendar. You can create a technical evaluation request for the appropriate agent and process order.
How to Clean Hot Melt Tank and Nozzle? hakkında merak edilenler
Can the hot melt tank be cleaned while the production is hot?
Controlled temperature may be required for evacuation; However, pressure relief, energy isolation and safe intervention temperature must be applied according to the machine manufacturer's procedure.
Is the same washing agent used for each hot melt?
No. The chemistry of the adhesive, color transition, equipment material and operating temperature should be evaluated together.
Is nozzle clogging caused only by dirt?
No. Carbonization, foreign matter, filter saturation, incorrect temperature and mechanical damage can also cause similar symptoms.
How to return to production after maintenance?
After leakage and pressure control, a trial is carried out at low speed; Once the glue trace, adhesion and first piece quality are confirmed, normal speed is started.
Technical resources and verification
The content has been prepared in Turkish with the technical experience of Koçak Endüstri, based on the following manufacturer resources.
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