Body fluid absorbent article

• US 7,847,145 B2
• Filed: 03/29/2004
• Issued: 12/07/2010
• Est. Priority Date: 03/31/2003
• Status: Active Grant

• Current Assignee: DAIO Paper Corporation
• Original Assignee: DAIO Paper Corporation
• Inventors: Kurita, Yuka, Nishizawa, Kazunori
• Primary Examiner(s): Zalukaeva; Tatyana
• Assistant Examiner(s): SU, SUSAN SHAN
• Application Number:
  US10/551,532
• Publication Number:
  US 20060116651A1
• Time in Patent Office: 2,444 Days
• Field of Search: 604/364, 604/378, 604/381
• US Class Current: 604/378
• CPC Class Codes: A61F 13/535 inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes A61F13/5323, A61F13/537 take precedence
• CPC Class Codes: A61F 13/53743 characterised by the position of the layer relative to the other layers

Abstract

The present invention relates to a technique for a body fluid absorbent article including a moving absorbent, capable of using a wider range of the absorbent for absorption and efficiently moving the absorbent. The present invention is characterized in that the absorbent 25 including a body fluid absorption and holding function and a shrinkage function when contacting with a body fluid is provided in a body fluid absorbent portion, and an absorption control layer 40 a liquid impermeable range of which is reduced whenever the body fluid is excreted is provided on the absorbent 25.

Claims

1. A body fluid absorbent article, wherein

an absorbent is provided in a body fluid absorbent portion and includes a body fluid absorption and holding function and a shrinkage function when contact with a body fluid;

an absorption control, layer is provided on said absorbent, and a liquid impermeable range of which is reduced whenever a body fluid is excreted;

said absorbent includes a fixed portion fixed to the article, and a free portion that is not fixed to the article,

said absorption control layer is reduced from a fixed portion side of said absorbent toward a free portion side thereof whenever the body fluid is excreted;

said absorbent is elongated and includes said fixed portion on one end thereof, and

said absorption control layer is a cylindrical member including the liquid impermeable range continuous in a circumferential direction and a longitudinal direction, said absorbent being inserted into an inner cavity of said absorption control layer.

2. The body fluid absorbent article according to claim 1, wherein

said liquid impermeable range includes a body fluid receiving portion defined as a range in which the excreted body fluid is received first within said body fluid absorbent portion.

3. The body fluid absorbent article according to claim 1, comprising:

a body fluid diffusion layer which covers said liquid impermeable range and at least a part of which protrudes outside the liquid impermeable range.

4. The body fluid absorbent article according to claim 1, wherein

said absorption control layer is configured so as not to block at least a contact between a fixed portion-side end of the free portion of said absorbent and the body fluid.

5. The body fluid absorbent article according to claim 1, comprising:

a body fluid diffusion layer that extends at least from a body fluid receiving portion defined as a range in which the excreted body fluid is received first within said body fluid absorbent portion to a fixed portion-side end of the free portion of said absorbent.

6. The body fluid absorbent article according to claim 3, comprising:

a body fluid storage portion that is provided in a body fluid receiving portion, said body fluid receiving portion is defined as a range in which the excreted body fluid that contacts the body fluid diffusion layer is received first within said body fluid absorbent portion.

7. The body fluid absorbent article according to claim 1, comprising:

a liquid permeable surface layer provided on a side facing a body skin; and

a leak-proof layer provided on a side away from the body skin, wherein

said body fluid absorbent portion is provided between the surface layer and the leak-proof layer, and

said liquid impermeable range includes at least a body fluid receiving portion defined as the range in which the excreted body fluid is received first within said body fluid absorbent portion.

8. A body fluid absorbent article comprising:

an absorbent provided in a body fluid absorbent portion, said absorbent includes a body fluid absorption and holding function and a shrinkage function when in contact with a body fluid;

an absorption control layer provided on said absorbent, said absorption control layer has a liquid impermeable range that is reduced whenever a body fluid is excreted;

said absorption control layer is a water soluble film having an absorbent-side surface that is not subjected to a water repellent treatment and an opposite surface to the absorbent-side surface that is subjected to the water repellent treatment.

9. The body fluid absorbent article according to claim 8, wherein

said absorption control layer is a liquid impermeable sheet which shrinks by 50% or more in area when wet.

10. The body fluid absorbent article according to claim 8, wherein

said absorption control layer is a liquid impermeable sheet integrated with a shrinkable member that shrinks when in contact with the body fluid.

11. The body fluid absorbent article according to claim 8, wherein

said absorption control layer is a liquid permeable sheet that has been subjected to a water repellent treatment, and the water repellency of the liquid permeable sheet is lost when it contacts body fluid for a predetermined time or more.

12. The body fluid absorbent article according to claim 8, comprising:

a plurality of wall members arranged within said body fluid absorbent portion at predetermined intervals, wherein

said absorbent and said absorption control layer are arranged between the wall members.