Device and method of liquid-permeable perforation of a nonwoven
A method for the manufacture of a perforated nonwoven, whereby perforation means engage into the nonwoven. The perforation means are arranged on a first roller. The perforation means engage through the nonwoven into a surface of a second roller. The perforation means displace fibers of the nonwoven, whereby the perforation means engage in a material on the second roller, such that said means can displace the material when they engage. In addition, a corresponding device and corresponding materials are provided for.
1 . A method for the manufacture of a perforated nonwoven, wherein perforation means engage into the nonwoven, the perforation means are arranged on a first roller, and the perforation means engage through the nonwoven into a surface of a second roller, the perforation means displace the fibres of the nonwoven, whereby the perforation means engage in a material on the second roller ( 10 ), which they can displace during the engagement, and whereby contours are formed in the material.
2 . The method according to claim 1 , wherein the perforation means engage into an at least partially fibrous material, which for preference forms the surface of the second roller.
3 . The method according to claim 1 , wherein the perforation means are heated up to a temperature which is below a melt temperature of the nonwoven or a decomposition temperature of the material.
4 . The method according to claim 1 , wherein a felt material is used.
5 . The method according to claim 4 , wherein the felt material is located onto the second roller as a shrinkage hose-type covering.
6 . The method according to claim 1 , wherein the perforation means displace the fibres of the nonwoven and push against the material whereby the fibres are compacted and an opening in the nonwoven is stabilised.
7 . The method according to claim 6 , wherein, when the perforation means engage, fibres are at least in part forced out of the nonwoven, whereby the fibres form a structure which correspondingly exhibits a geometry of the perforation means, which, after the nonwoven has run through the first and second roll, rises from a surface of the nonwoven.
8 . The method according to claim 6 wherein, when the perforation means engage into the material, fibres are at least in part drawn in sympathy into the material.
9 . The method according to claim 1 , wherein the perforated nonwoven is detected.
10 . A roll calender for the perforation of a nonwoven, whereby the roll calender exhibits a first and a second roller, the first roller has perforation means which project from a surface of the first roller, and the first and the second rollers form a gap, through which the nonwoven which is to be perforated is guided, wherein the second roller exhibits a material as its surface which can be displaced by the perforation means, whereby the gap is set in such a way that the perforation means engage into the material, and whereby contours are formed in the material of the second roller.
11 . The roll calender according to claim 10 , wherein the gap is capable of being changed.
12 . The roll calender according to claim 10 , wherein the material exhibits fibres at least in part.
13 . The roll calender according to claim 10 , wherein the material exhibits a felt material.
14 . The roll calender according to claim 13 , wherein the felt material exhibits a thickness of at least 6 mm.
15 . The roll calender according to claim 13 wherein the felt material is a shrinkage hose covering.
16 . The roll calender according to claim 13 wherein the felt material is arranged under mechanical tension on the second roll.
17 . The roll calender according to claim 13 , wherein a connection material is applied on the second roll, which creates a connection between the felt material and the second roll.
18 . The roll calender according to claim 10 , wherein the second roll is driven.
19 . The roll calender according to claim 10 , wherein the perforation means are needles which are capable of perforating the nonwoven in such a way as to render it permeable to fluids.
20 . The roll calender according to claim 10 , wherein a carrier is drawn onto the second roller, on which the material is arranged.
21 . The roll calender according to claim 10 , wherein a detector unit is arranged at the roll calender, which detects the perforated nonwoven.
22 . The roll calender according to claim 10 , wherein the roll calender exhibits a changeover device for changing the second roller which is engaged with the first roller by a third roller.
23 . The roll calender according to claim 10 , wherein the roll calender exhibits a lateral possibility of access at the second roll for drawing the felt material up and off.
24 . (canceled)
25 . (canceled)
26 . (canceled)
27 . A perforated nonwoven manufactured by a method according to claim 1 in which the nonwoven, has a connecting surface which amounts to between 8% and 25%.
28 . (canceled)
29 . (canceled)