Abstract A method of and calender for calendering synthetic plastics film, particularly PVC film, wherein the total roller looping distance of the film around the rolls of the calender is reduced having regard to known five-roll calenders by providing that the material to form the film is fed into a roller gap between a first roller and a third roller, with the first roller set at the same height as the third roller, the film is looped around the third roller for three quarters of the circumference thereof and, during such looping, passes through a second roller gap between the third roller and a second roller disposed beneath the third roller and through a third roller gap between the third roller and a fourth roller disposed above the third roller, the film then being looped around the fourth roller for three quarters of the circumference thereof and, during such looping, passes through a fourth roller gap between the fourth roller and the fifth roller mounted above the fourth roller, the calendered film then being pulled off from the fourth roller.
In a five-roll calendar for calendering synthetic plastics film an arrangement of said five-rolls such that a third calender roller of said five-roll calender co-operates with a laterally preceding first calender roller, set at the same height as said third calender roller, to form a first working roller gap, and cooperates with a second calender roller disposed beneath said third calender roller to form a second working roller gap, and cooperates with a fourth calender roller disposed above said third calender roller to form a third working roller gap, and said fourth calender roller co-operates with a fifth calender roller to form a fourth roller gap, a pull-off roller cooperating with said fourth calender roller to form a fifth roller gap located three-quarters of the circumference of said fourth calender roller from said third roller gap, the arrangement being such that said film is looped around three-quarters of the circumference of said third calender roller and three-quarters of the circumference of said fourth calender roller before being pulled off said fourth roller.
Claim 2
Dependent Claim
172 words
In a five-roll calendar for calendering synthetic plastics film an arrangement of said five-rolls such that a third calender roller of said five-roll calender co-operates with a laterally preceding first calender roller, set at the same height as said third calender roller, to form a first working roller gap, and cooperates with a second calender roller disposed beneath said third calender roller to form a second working roller gap, and cooperates with a fourth calender roller disposed above said third calender roller to form a third working roller gap, and said fourth calender roller co-operates with a fifth calender roller to form a fourth roller gap, a pull-off roller cooperating with said fourth calender roller to form a fifth roller gap located three-quarters of the circumference of said fourth calender roller from said third roller gap, the arrangement being such that said film is looped around three-quarters of the circumference of said third calender roller and three-quarters of the circumference of said fourth calender roller before being pulled off said fourth roller.
Claim 3
Dependent Claim
24 words
The calender of claim 1, wherein said fourth calender roller of said five-roll calender is of smaller diameter than the other four calender rollers.