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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.
Raw Material / BindersFibre 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
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
Heat Transferred
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 / Lamination