Cleaning sheet

• US 6,245,413 B1
• Filed: 09/08/1999
• Issued: 06/12/2001
• Est. Priority Date: 09/24/1998
• Status: Expired due to Term

• Current Assignee: Unicharm Corporation
• Original Assignee: Unicharm Corporation
• Inventors: Tanaka, Yoshinori, Fujiwara, Masatoshi, Kenmochi, Yasuhiko
• Primary Examiner(s): Morris, Terrel
• Assistant Examiner(s): TORRES VELAZQUEZ, NORCA LIZ
• Application Number:
  US09/391,821
• Time in Patent Office: 643 Days
• Field of Search: 428/141, 428/156, 428/157, 428/192, 428/195, 442/381, 442/400, 442/401, 192/62, 152/091
• US Class Current: 428/157
• CPC Class Codes: A47L 13/20 Mops
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/24488 Differential nonuniformity at margin
• CPC Class Codes: Y10T 428/24777 Edge feature
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 442/659 Including an additional nonwoven fabric
• CPC Class Codes: Y10T 442/68 Melt-blown nonwoven fabric
• CPC Class Codes: Y10T 442/681 Spun-bonded nonwoven fabric

Abstract

A cleaning sheet which is attached to a cleaning tool during use which comprises a wiping region having a wiping layer and attaching regions positioned on both sides of the wiping region, where a plurality of recesses are formed at intervals along boundaries between the wiping region and the attaching regions such that the recesses extend from the boundaries toward the center of the wiping region.

Claims

1. A cleaning sheet for attachment to a cleaning tool during use, the cleaning sheet comprising:

a wiping region having a wiping layer and attaching regions positioned on both sides of the wiping region, wherein

a plurality of recesses are formed at intervals along boundaries between the wiping region and the attaching regions such that the recesses extend from the boundaries toward a center of said wiping region.

2. The cleaning sheet according to claim 1, wherein the recesses are in a plane shape such that a width thereof, as taken in a direction parallel to the boundaries, is largest at the boundaries and becomes gradually narrower toward the center of said wiping region.

3. The cleaning sheet according to claim 2, wherein the recesses along a boundary on one side of the wiping region and the recesses along a boundary on another side of the wiping region are staggered in the direction parallel to the boundaries.

4. The cleaning sheet according to claim 3, wherein a ratio of the width of the recess to the interval is from 80:

20 to 20;

80, with respect to the boundary.

5. The cleaning sheet according to claim 4, wherein each of said recesses is formed by one of pressing, heat-pressing and thermally welding the wiping layer.

6. The cleaning sheet according to claim 5, wherein each of said recesses is formed by partially thermally welding the wiping layer to form a plurality of thermally welded portions.

7. The cleaning sheet according to claim 6, wherein the thermally welded portions are stripe patterned.

8. The cleaning sheet according to claim 7, further comprising:

a sheet substrate having the wiping layer disposed on one surface.

9. The cleaning sheet according to claim 8, wherein the wiping layer is formed of at least one of filaments, a split yarn and strip-shaped materials.

10. The cleaning sheet according to claim 7, further comprising:

a sheet substrate having the wiping layer disposed on each surface.

11. The cleaning sheet according to claim 10, wherein the wiping layer is formed of at least one of filaments, a split yarn and strip-shaped materials.