Continuously perforating matted fibre webs - using embossing cylinder heated to melting temp. and contact cylinder heated to softening temp. and differential speeds

摘要

Matted fibre web is continuously performed using a gravure cylinder and a plain surface contact cylinder. The cylinder is heated to the melting temp. of the thermoplastics fibres, the contact cylinder is heated to the average softening temp. of the web and the gravure cylinder is driven at a higher peripheral speed to withdraw the web under tension from the nip between the two cylinders. Pref. the gravure cylinder is to 160-260 degrees C, and the contact cylinder is heated to 145-210 degrees C. The gravure cylinder pref. is driven at a peripheral speed which exceeds that of the contact cylinder by 110 to 200%.