Thermal bonding technique by Vignesh Dhanabalan
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Transcript of Thermal bonding technique by Vignesh Dhanabalan
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
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
