Short description on Thermal Bonding Technique

1. Thermal
Bonding
VIGNESH DHANABALAN
vigneshdhanabalan@hotmail.com

2. Principle of Thermal Bonding
(1) Heating the web to partially melt the crystalline region,
(2)
Repetition of the newly released chain segments across the
fibre-fibre interface
(3)
Subsequent cooling of the web to re-solidify it and to trap the
chain segments that diffused across the fibre-fibre interface.
vigneshdhanabalan@hotmail.com

3. Raw Material / Binders
Fibre Melting temperature (degree
Celsius)
PET (H/L) 245-265 (140-160)
PP (H/L) 160-175 (90-120)
PA 210-230
PE 115-135
PE/PET 130/250
PE/PP 130/175
CoPET/PET 110/250
vigneshdhanabalan@hotmail.com

4. How thermal bonding takes place…?
– Heat is supplied by passing of
material through hot calendar
rollers..
– Heat can be transfered by blowing
hot air through the web
vigneshdhanabalan@hotmail.com

5. Bonding by
Air system
Two Way
Bonding by
Air system
one way
vigneshdhanabalan@hotmail.com

6. Heat Transferred
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7. Other forms of Bonding - Thermal
– IR Heating
– Electro magnetic flux is created
(0.7-300 μ m)
– Break down of molecules
resulting in heat generation.
– Ultrasonic Bonding
– Vibrated at a frequency of 20-40 KHz
– Friction between the tip and fiber
layer generates heat
– Surface Bonding / Laminationvigneshdhanabalan@hotmail.com