Sanitary napkin

A sanitary napkin comprising:

• an elongated main body having a skin-side surface and a garment-side surface and including a liquid absorbent layer for absorbing liquid applied to the skin-side surface and a backsheet appearing on the garment-side surface;
• fold-back flaps configured to be folded back against an outer surface of an undergarment at a crotch part thereof in use, the fold-back flaps projecting outward from transversely opposite sides of the main body and having front pressure-sensitive adhesive layers on garment-side surfaces thereof for adhering the fold-back flaps to the outer surface of the undergarment;
• rear flaps configured to be placed on an inner surface of the undergarment in use in an unfolded state, the rear flaps projecting outward from the transversely opposite sides of the main body and having rear pressure-sensitive adhesive layers on garment-side surfaces thereof for adhering the rear flaps to the inner surface of the undergarment, the rear flaps being located rearward of the fold-back flaps and larger in length than the fold-back flaps;
• and
• longitudinally extending leakage preventing walls disposed on the skin-side surface of the main body and at equal distances on each side of a longitudinal centerline, each leakage preventing wall having front and rear ends fixed to the skin-side surface and exhibiting an elastic contractive force to bring the front and rear ends closer to each other so as to rise from the skin-side surface,
• wherein the rear pressure-sensitive adhesive layers are located forward of the rear ends of the leakage preventing walls,
• wherein on each side of the longitudinal centerline, a starting point from which a half-width, measured from the longitudinal centerline to a side edge, starts to increase rearward is located rearward of the fold-back flap, and the rear flap includes:
• a front spreading portion where the half-width gradually increases rearward from the starting point;
• an intermediate portion where the side edge extends parallel to the longitudinal centerline or extends with a deviation within a range of ±5 mm transversely from an imaginary line parallel to the longitudinal centerline;
• and a rear converging portion where the half-width gradually decreases toward a rear end edge of the napkin, wherein a front boundary point between the front spreading portion and the intermediate portion is located forward of the rear end of the leakage preventing wall,
• wherein L1/L0 is at least ⅓, where L0 represents a length from the starting point to the rear end edge of the napkin while L1 represents a length from the front boundary point to a rear boundary point between the intermediate portion and the rear converging portion.

A sanitary napkin comprising:

• an elongated main body having a skin-side surface and a garment-side surface and including a liquid absorbent layer for absorbing liquid applied to the skin-side surface and a backsheet appearing on the garment-side surface;
• fold-back flaps configured to be folded back against an outer surface of an undergarment at a crotch part thereof in use, the fold-back flaps projecting outward from transversely opposite sides of the main body and having front pressure-sensitive adhesive layers on garment-side surfaces thereof for adhering the fold-back flaps to the outer surface of the undergarment;
• rear flaps configured to be placed on an inner surface of the undergarment in use in an unfolded state, the rear flaps projecting outward from the transversely opposite sides of the main body and having rear pressure-sensitive adhesive layers on garment-side surfaces thereof for adhering the rear flaps to the inner surface of the undergarment, the rear flaps being located rearward of the fold-back flaps and larger in length than the fold-back flaps;
• and
• longitudinally extending leakage preventing walls disposed on the skin-side surface of the main body and at equal distances on each side of a longitudinal centerline, each leakage preventing wall having front and rear ends fixed to the skin-side surface and exhibiting an elastic contractive force to bring the front and rear ends closer to each other so as to rise from the skin-side surface,
• wherein the rear pressure-sensitive adhesive layers are located forward of the rear ends of the leakage preventing walls,
• wherein on each side of the longitudinal centerline, a starting point from which a half-width, measured from the longitudinal centerline to a side edge, starts to increase rearward is located rearward of the fold-back flap, and the rear flap includes:
• a front spreading portion where the half-width gradually increases rearward from the starting point;
• an intermediate portion where the side edge extends parallel to the longitudinal centerline or extends with a deviation within a range of ±5 mm transversely from an imaginary line parallel to the longitudinal centerline;
• and a rear converging portion where the half-width gradually decreases toward a rear end edge of the napkin, wherein a front boundary point between the front spreading portion and the intermediate portion is located forward of the rear end of the leakage preventing wall,
• wherein an imaginary line, which coincides with the starting point and is tangent to an edge of the rear flap, forms an angle of 30 to 45 degrees with the longitudinal centerline.

A sanitary napkin comprising:

• an elongated main body having a skin-side surface and a garment-side surface and including a liquid absorbent layer for absorbing liquid applied to the skin-side surface and a backsheet appearing on the garment-side surface;
• fold-back flaps configured to be folded back against an outer surface of an undergarment at a crotch part thereof in use, the fold-back flaps projecting outward from transversely opposite sides of the main body and having front pressure-sensitive adhesive layers on garment-side surfaces thereof for adhering the fold-back flaps to the outer surface of the undergarment;
• rear flaps configured to be placed on an inner surface of the undergarment in use in an unfolded state, the rear flaps projecting outward from the transversely opposite sides of the main body and having rear pressure-sensitive adhesive layers on garment-side surfaces thereof for adhering the rear flaps to the inner surface of the undergarment, the rear flaps being located rearward of the fold-back flaps and larger in length than the fold-back flaps;
• and
• longitudinally extending leakage preventing walls disposed on the skin-side surface of the main body and at equal distances on each side of a longitudinal centerline, each leakage preventing wall having front and rear ends fixed to the skin-side surface and exhibiting an elastic contractive force to bring the front and rear ends closer to each other so as to rise from the skin-side surface,
• wherein the rear pressure-sensitive adhesive layers are located forward of the rear ends of the leakage preventing walls,
• wherein a half-width, measured from the longitudinal centerline to a side edge, is larger in a rear portion of the rear flap than in a front portion of the rear flap, and is largest rearward of a longitudinal center of the rear flap,
• wherein Le/L0 is at most ⅕, where Le represents a length from a point where the half-width is largest to a rear end edge of the napkin while L0 represents a length of the rear flap.

A sanitary napkin comprising:

• an elongated main body having a skin-side surface and a garment-side surface and including a liquid absorbent layer for absorbing liquid applied to the skin-side surface and a backsheet appearing on the garment-side surface;
• fold-back flaps configured to be folded back against an outer surface of an undergarment at a crotch part thereof in use, the fold-back flaps projecting outward from transversely opposite sides of the main body and having front pressure-sensitive adhesive layers on garment-side surfaces thereof for adhering the fold-back flaps to the outer surface of the undergarment;
• rear flaps configured to be placed on an inner surface of the undergarment in use in an unfolded state, the rear flaps projecting outward from the transversely opposite sides of the main body and having rear pressure-sensitive adhesive layers on garment-side surfaces thereof for adhering the rear flaps to the inner surface of the undergarment, the rear flaps being located rearward of the fold-back flaps and larger in length than the fold-back flaps;
• and
• longitudinally extending leakage preventing walls disposed on the skin-side surface of the main body and at equal distances on each side of a longitudinal centerline, each leakage preventing wall having front and rear ends fixed to the skin-side surface and exhibiting an elastic contractive force to bring the front and rear ends closer to each other so as to rise from the skin-side surface,
• wherein the rear pressure-sensitive adhesive layers are located forward of the rear ends of the leakage preventing walls,
• wherein a half-width, measured from the longitudinal centerline to a side edge, is larger in a rear portion of the rear flap than in a front portion of the rear flap, and is largest rearward of a longitudinal center of the rear flap,
• wherein auxiliary pressure-sensitive adhesive layers are further disposed on the garment-side surfaces of the rear flaps at a distance rearward of the rear pressure-sensitive adhesive layers,
• wherein the auxiliary pressure-sensitive adhesive layers are farther away from the longitudinal centerline than is the rear pressure-sensitive adhesive layers.