Household animal waste collection sheet

Details Household animal waste collection sheet Household animal waste collection sheet

1999-03-23

2001-05-08

Jordan, Charles T. (Department: 3644)

Animal husbandry

Material for absorbing moisture from waste product

Having paper-related component

C119S163000, C604S378000

Reexamination Certificate

active

06227145

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a household animal waste collection sheet which is laid on a floor for collecting and disposing of a waste of a household animal. More specifically, it relates to a household animal waste collection sheet having excellent absorbing properties.
BACKGROUND OF THE INVENTION
In order to collect and dispose of wastes of household animals (pets to be kept indoors), a household animal waste collection sheet has been used.
FIG. 3
shows a conventional household animal waste collection sheet
11
. This household animal waste collection sheet
11
comprises a liquid permeable top sheet
12
such as a nonwoven fabric, a liquid impermeable backing sheet
13
such as a resin sheet, and an absorbent core
14
interposed between the top sheet
12
and the backing sheet
13
. The absorbent core
14
is wrapped up in absorbent paper such as tissue paper. The absorbent core
14
is composed of a ground pulp layer
16
and particulate super-absorbent polymers
15
dispersed in the pulp layer
16
. The pulp is excellent in a rate of liquid-absorption (swiftness) and the super-absorbent polymer is excellent in a liquid-absorption capacity. Accordingly, the absorbent core
14
can absorb a large amount of urine at a high rate of liquid-absorption.
However, a liquid-retentivity of the pulp is very low. Then, the urine once absorbed in the pulp tends to flow backward to the surface of the top sheet
12
, and the top sheet
12
is disadvantageously wetted again.
SUMMARY OF THE INVENTION
The present invention is to solve the conventional problems. It is an object of the present invention to provide a household animal waste collection sheet which has excellent absorbing properties.
The object of the present invention is achieved by a household animal collection sheet comprising a liquid permeable top sheet, a liquid impermeable backing sheet, and an absorbent core interposed between the top sheet and the backing sheet, the absorbent core comprising a pulp layer and particulate super-absorbent polymers, the particulate super-absorbent polymers being disposed on both a top face and a bottom face of the pulp layer.
The household animal waste collection sheet of the present invention has a high rate of liquid-absorption due to the particulate super-absorbent polymers disposed on the bottom face of the pulp layer. Further, it can prevent the liquid once absorbed in the absorbent core from flowing backward to the surface of the top sheet, due to the particulate super-absorbent polymers disposed on the top face of the pulp layer. Still further, since both the top face and the bottom face of the pulp layer are covered with the super-absorbent polymers, the waste collection sheet has a high toughness. Accordingly, twisting or rolling of the sheet hardly occurs during use.
In the present invention, the rate of liquid-absorption of the super-absorbent polymers disposed on the bottom face is preferably higher than that of the super-absorbent polymers disposed on the top face. With such a structure, the rate of liquid-absorption of the waste collection sheet can be further increased. The rate of liquid-absorption of the super-absorbent polymers varies depending on whether or not they are crosslinked or on the particle size thereof. Therefore, it is preferable that the super-absorbent polymers disposed on the top face are crosslinked at surfaces thereof. Alternatively, it is preferable that the average particle size of the super-absorbent polymers disposed on the bottom face is smaller than that of the super-absorbent polymers disposed on the top face. In this case, for example, the average particle size of the super-absorbent polymers disposed on the bottom face is 80 meshes or more (0.175 mm or less), and the average particle size of the super-absorbent polymers disposed on the top face is 42 meshes or less (0.351 or more).
In the present invention, further, it is preferable that the super-absorbent polymers disposed on the top face are arranged in an intermittent or spotted pattern.
Still Further, it is preferable that the absorbent core is wrapped up in tissue paper.


REFERENCES:
patent: 4800841 (1989-01-01), Yananton et al.
patent: 4852518 (1989-08-01), Yananton
patent: 5558655 (1996-09-01), Jezzi et al.
patent: 5669894 (1997-09-01), Goldman et al.
patent: 5681300 (1997-10-01), Ahr et al.
patent: 5715772 (1998-02-01), Kamrath et al.
patent: 08-317740 (1996-03-01), None
patent: 08-056518 (1996-05-01), None
patent: WO94/06385 (1994-03-01), None

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