Hot tack strength refers to the strength measured by peeling the heat-sealed sample at a certain speed before it returns to room temperature, i.e. while it's still hot.
Hot tack property is important since this situation occurs on vertical form-fill-seal packaging, during which no much cooling time is given. In the packing line, contents are dropped into the bag immediately after the sealing bars have opened.
Since the content can be heavy, the hot seal must be able to withstand high loads, thus requiring a high hot tack force.
Test principle
Under known temperature, contact time and pressure conditions, the sample is heat sealed from two heating bars/jaws. Before the temperature drops to room temperature, peel off the heat sealed surface with a certain speed and test its force value, which is the hot tack strength.
Technical features
HTT-02 hot tack tester adopts latest vertical structure and it realizes automatic sample inserting and high speed separation. The application of PLC control unit and HMI touch screen ensure the stability of tester.
HTT-02 is also able to realize precious speed control(by ball lead screw), temperature control and unform heating.
1. PLC control and 7-inch human-machine interface touch screen operation
2. Branded PID temperature control unit
3. Aluminum sealing jaws, with upper teflon coated and lower covered with rubber pad.
4. Both Method A and B described in ASTM F1921
5. RS232 COM port and professional software (optional)
6. Able to provide customized language display
Technical Data
Index |
Parameter |
Temperature Range | Ambient ~ 250 ℃ |
Accuracy | ± 0.2 ℃ |
Heat Sealing Dwell Time | 0.1 ~ 9999s |
Hot Tack Dwell Time | 0.1 ~ 9999s |
Power | 220V |
Sealing Pressure | 0.15MPa~0.7MPa |
Sealing Area | 50 mmx10mm |
Heating Mode | double heating |
Loadcell | 200N (other available) |
Accuracy of Force | 0.5 % F.S. |
Resolution | 0.01N |
Standard
ASTM F1921 Standard Test Methods for Hot Seal Strength (Hot Tack) of Thermoplastic Polymers and Blends Comprising the Sealing Surfaces of Flexible Webs
Custom application
ASTM F2029 Heat Seal Test
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