Polymer films may be discontinuously laminated by processes such as adhesive bonding, ultrasonic bonding, embossing, ring rolling, and strainable network formation.

The process comprises subjecting the paper web to shear by using calender rolls driven at different speeds or calender rolls with different diameters.

The multiple-nip calender of the invention is characterized in that at least one of the calendering nips of the multiple-nip calender is an extended nip (N9) formed between a polymer roll (18) and either a shoe roll (30) or a calendering belt.

Process for mixing and subsequent lamination by calendering of water-proofing and/or sound-proofing compositions by using a system of antiskid rollers.

A soft calender contains two roll groups (A, B) of three rolls, each forming two successive soft calendering nips (N) while the rolls are located on top of each other in the groups.

The elastic rolls (3, 5) define in a working position calendering nips with the hard rolls (1, 2).

Rolls (15, 15", 16, 16") for expanding the web in the widthwise direction are provided between any steps during the process of rough rolling, intermediate rolling and final rolling.

The plate rolling is carried out with machines called plate bending rolling (plate bending rolling machines 3 rolls or plate bending rolling machines 4 rolls).

Furthermore is described a method for calendering a fibrous web on an on-line multi-roll calender.

The rolls (350, 352) may be delivered to the heating apparatus (802) from an initial storage area (420) or the calendering apparatus (300).

This material, which is suitable for the production of calendered sheet, has only a very slight tendency to stick to the hot calendering rolls and the polymer molecules have only a slight tendency to decompose during processing.

For better results, the calendering can be carried out with heated rollers.

In a method for calendering a paper web, a paper web (W) to be calendered is led through successive calender nips (N).

At a heating area (800), the rolls (350, 352) are preheated, reheated, or maintained at any temperature prior to the rolls (350, 352) being placed into the calendering apparatus (300).

In the roll stacks (11) the rolls are movable into nip contact with one another to calender a fibrous web (W) in closed nips.