How Do Open Time and Freeze Time Affect Line Speed?
Open time is the window in which parts can be safely assembled after the adhesive has been applied; The setting time refers to the speed at which the bond reaches its initial bearing strength. The line must join the parts before the open time runs out and must not release the press before the bond has sufficiently frozen.
Increasing line speed is not just about increasing engine speed. The steps of applying the adhesive, moving the part, assembling, and printing must all run within the same time window. If the open time is short, the surfaces will coalesce late; If the freezing time is insufficient, the part can be opened after it comes out of the press.
Difference between two durations
Open time is the available time between execution and assembly. Setting time is the speed at which the hot adhesive cools down and gains initial mechanical strength. These values are affected by application amount, surface temperature, environment, substrate, line speed and product temperature; The catalog value is not a substitute for a field trial.
Effect on line speed
| Process status | Possible result | First check |
|---|---|---|
| Joining too late | Poor wetting | Conveying distance and open time |
| Print early being released | Opening on the lid | Freezing time and pressure |
| Over application | Slow cooling, overflow | Gramage and nozzle mark |
| Cold surface | Early freezing | Material temperature |
Sequence of adjustment according to specification
- Verify the actual application temperature by independent measurement.
- Measure the time between the nozzle and the joining point.
- Check the glue trace and grammage.
- Record the pressing force and time.
- Change the single variable and take the sample with the same batch of material.
Just raising the temperature is not the solution; May increase oxidation, odor, energy consumption and equipment residue.
Matching with product family
Hot melt adhesives Open time and setting behavior vary by application. packaging glue product family for packaging lines; for different speed profiles Jowatherm 851.15, 852.07 and 852.17 product pages with their published TDS.
Field verification
Storage temperature, cardboard humidity and line starting conditions may be different in facilities in Istanbul, Izmir, Kocaeli, Bursa and Ankara. Experiment with the lowest and highest actual speed; Save the sample after the first piece, normal operation and planned stop separately. send your application information for technical matching.
How Do Open Time and Freeze Time Affect Line Speed? hakkında merak edilenler
Is open time and operating time the same?
The terms may be confused depending on the application; where open time refers to the time remaining for safe assembly after application.
Will more glue be needed as the line gets faster?
Not always. Grammage; It should be tested according to surface, nozzle, bond area and strength requirement.
Does cold material affect open time?
Yes. The cold substrate can draw heat from the adhesive more quickly, shortening the usable bonding window.
Is setting time the same as full cure?
No. Freezing is related to initial bearing strength; especially in reactive products, final properties improve with subsequent curing.
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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