How to Store and Handle PUR Hot Melt Adhesive?
PUR hot melt is stored in its unopened and undamaged packaging under the conditions specified in the TDS; After opening, contact with moisture is minimized. Melting temperature, waiting time in the tank and stopping procedure are adjusted together with the product TDS and the machine instructions.
Reactive polyurethane hot melt adhesives gain initial adhesion by cooling, then continue their chemical curing with ambient humidity. This feature provides high performance; It also requires discipline against moisture in the packaging, storage and melting process.
Why is humidity control necessary?
Moisture entering the packaging or melting system can lead to premature reaction, surface crusting, viscosity change and hardened residue inside the equipment. Therefore, the “smoothing the flow with higher temperature” approach may aggravate the problem. First, packaging integrity, product age, tank waiting time and temperature sensor should be checked.
Storage and unpacking
- Keep the packaging dry, clean and under the temperature conditions specified in TDS.
- Evaluate the crushed, punctured or vacuum-lost packaging before putting it into production.
- Open the product as needed; Do not leave the remaining product open to ambient air.
- Check the risk of condensation in the product coming from cold storage.
- Record the batch number and first-in, first-out order.
Melting and line stop
Tank and hose temperatures should not be equalized randomly. The product's technical sheet, machine geometry and line flow rate are evaluated together. During long stops, the temperature reduction or evacuation procedure recommended by the manufacturer is applied. Mixing normal thermoplastic hot melt residue into the PUR system also impairs performance.
| Situation | Risk | Control |
|---|---|---|
| Open packaging | Dehumidification | Exposure time and closure |
| Long tank waiting | Viscosity increase | Temperature and stance registration |
| Frequent product changeover | Incompatible residue | Approved migration procedure |
How do you verify product selection?
Shift checklist
Seasonal temperature and relative humidity differences may create a risk of condensation between the storage area and the production area in Istanbul, Bursa, Ankara, Izmir and Kocaeli facilities. Record packaging, environment, tank temperature, pressure and first piece control in the same form at the beginning of the shift. You can use the technical offer form for the product and transition procedure suitable for your application.
How to Store and Handle PUR Hot Melt Adhesive? hakkında merak edilenler
Can PUR hot melt be stored again after opening?
It depends on the product and packaging. Since exposure to ambient humidity may affect performance, TDS and manufacturer's instructions should be taken as basis.
Why does PUR hot melt form a crust in the tank?
Moisture ingress, long standing or inappropriate temperature can accelerate premature reaction; The sensor and cover sealing should also be checked.
Is the temperature always lowered during stance?
Downtime is decided by product and equipment; No single temperature value is accurate for all lines.
Should the tank be completely emptied during product change?
The manufacturer's recommended draining or flushing procedure should be followed according to product compatibility and transition plan.
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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