Animal waste collection sheet
The present invention provides an animal waste collection sheet effectively inhibiting the leakage of urine, the unclean appearance and the damp or chill surface without increasing the thickness and weight of the top sheet unnecessarily, thus improving the handling property thereof. For example, the animal waste collection sheet is planar and is consisted of a top sheet which is liquid permeable, a back sheet which is liquid impermeable and an absorbent sheet disposed between the top sheet and the back sheet. The top sheet is consisted of a non-woven fabric with convex and concave portions on the surface thereof. The top sheet is preferably a non-woven fabric alternately having a plurality of groove portions and a plurality of convex portions formed in a fixed direction.
1. An animal waste collection sheet comprising: a top sheet which is at least partially liquid permeable; a back sheet which is liquid impermeable; and an absorbent sheet disposed between the top sheet and the back sheet, wherein:
the top sheet consists of a single fiber web layer formed to have alternately a plurality of groove portions and a plurality of convex portions formed in a predetermined direction;
each convex portion has a convex central region and side edge regions at both sides of the central region and sandwiching the central region, the convex portion being extended along the predetermined direction,
the side edge region of each of the plurality of convex portions fiber has a orientation parallel to the predetermined direction; and
a fiber density of the side edge region is higher than a fiber density of the convex portion, and the fiber density of the convex region in the thickness direction of the top sheet is substantially uniform; and a bottom of the groove portions has a fiber density no greater than 0.18 g/cm 3 ;
the central region of the convex portion has a fiber density in the range of 0.005 to 0.20 g/cm 3 ; and the side edge region of the convex portions has a fiber density in the range of 0.007 to 0.40 g/cm 3 .
2. The animal waste collection sheet according to claim 1 , wherein a plurality of through holes is provided at predetermined intervals on each of the plurality of groove portions of the top sheet.
3. The animal waste collection sheet according to claim 1 , wherein the top sheet is extended at least in a marginal portion of the animal waste collection sheet.
4. The animal waste collection sheet according to claim 1 , wherein: a planar dimension of the top sheet is no less than 600 cm 2 ; and a bending moment of the top sheet in the fixed direction at a curvature of 0.5 cm −1 is no less than 1×10 −2 N·m/m.