Unitary deflection member for making fibrous structures having increased surface area and process for making same
A unitary deflection member. The unitary deflection member can have a fluid pervious reinforcing member and a patterned framework. The patterned framework can have a plurality of regularly spaced protuberances extending from the reinforcing member. At least two of said protuberances can be similar in size and shape, and can have linear segments having different cross-sectional areas along the z-direction.
1. A unitary deflection member, the unitary deflection member comprising:
a fluid pervious reinforcing member;
a patterned framework comprising a plurality of regularly spaced protuberances extending from said reinforcing member, at least two of said protuberances being similar in size and shape; and
wherein said plurality of regularly spaced protuberances are linear segments having different cross-sectional areas along the z-direction.
2. The deflection member of claim 1 , further comprising a plurality of voids defining a plurality of deflection conduits.
3. The deflection member of claim 2 , wherein said plurality of deflection conduits are linear segments spaced apart in either the MD or CD.
4. The deflection member of claim 3 , wherein said plurality of deflection conduits are linear segments spaced apart in the MD.
5. The deflection member of claim 3 , wherein said plurality of deflection conduits are linear segments spaced apart in the CD.
6. The deflection member of claim 2 , wherein said plurality of deflection conduits are generally parallel linear segments oriented predominantly in the MD or CD.
7. The deflection member of claim 6 , wherein said plurality of deflection conduits are generally parallel linear segments oriented predominantly in the MD.
8. The deflection member of claim 6 , wherein said plurality of deflection conduits are generally parallel linear segments oriented predominantly in the CD.
9. The deflection member of claim 2 , wherein the plurality of deflection conduits are disposed in a regular, spaced apart configuration of discrete units in an X-Y plane and distributed in both the MD and CD in a regular, spaced pattern.
10. The deflection member of claim 2 , wherein at least two of the plurality of deflection conduits are substantially identical in size and shape.
11. The deflection member of claim 1 , wherein the framework is a semi-continuous framework.
12. The deflection member of claim 1 , wherein at least two of said protuberances have a stepped, multilevel shape.
13. The deflection member of claim 1 , wherein the linear segments having a cross-sectional shape, the cross-sectional shape being selected from the group consisting of key-hole-shaped, mushroom-shaped, circular, oval, inverted triangle, T-shaped, inverted L-shaped, egg- or pebble-shaped, and combinations thereof.
14. The deflection member of claim 1 , wherein the patterned framework is disposed at a first side of the reinforcing member and wherein strands are disposed at a second side of the reinforcing member.
15. The deflection member of claim 14 , wherein the strands are CD-oriented.
16. The deflection member of claim 14 , wherein the strands are MD-oriented.
17. The deflection member of claim 16 , wherein the MD-oriented strands are oriented in a two-layer stacked configuration.