Disposable diaper

A disposable diaper, comprising:

• a front waistline region;
• a rear waistline region;
• a crotch region positioned between the front waistline region and the rear waistline region;
• a pair of leg hole opening units;
• an absorber running across the crotch region and extending in the front waistline region and rear waistline region;
• a product longitudinal direction from the front waistline region towards the rear waistline region;
• a product widthwise direction perpendicular to the product longitudinal direction;
• a waistline retaining unit extending along the product widthwise direction in the front waistline region and the rear waistline region, and configured to hold the disposable diaper onto a body of a wearer;
• a crotch stretch unit formed in the crotch region and being completely apart from the waistline retaining unit in the product longitudinal direction, and the crotch stretch unit being configured to expand and contract in at least the product longitudinal direction;
• and
• a pair of leg elastic units respectively formed along the pair of leg hole opening units, the pair of leg elastic units extending in the front and rear waistline regions and being configured to be expanded and contracted in at least the product longitudinal direction;
• wherein
• the crotch stretch unit is positioned on a non-skin contact surface side of the absorber and overlaps the absorber in a product thickness direction of the disposable diaper,
• a low stretch region having a lower ratio of expansion and contraction than the crotch stretch unit is formed between each of the leg elastic units and the crotch stretch unit,
• the crotch stretch unit has a front end and a rear end opposite to the front end in the product longitudinal direction,
• the pair of leg elastic units continuously extends, in the product longitudinal direction, beyond the front and rear ends of the crotch stretch unit,
• each of the leg elastic units is provided at an outer side from the crotch stretch unit in the product widthwise direction,
• when the disposable diaper is worn, the low stretch region is configured to form a predetermined gap between the disposable diaper and the body of the wearer, by bulging more than the crotch stretch unit,
• the crotch stretch unit is formed of an elastic sheet, and
• in a natural state of the disposable diaper, a width of the elastic sheet of the crotch stretch unit in the product widthwise direction is 50 to 110 mm.

A disposable diaper, comprising:

• a front waistline region;
• a rear waistline region;
• a crotch region positioned between the front waistline region and the rear waistline region;
• a pair of leg hole opening units;
• an absorber running across the crotch region and extending in the front waistline region and the rear waistline region;
• a product longitudinal direction from the front waistline region towards the rear waistline region;
• a product widthwise direction that is perpendicular to the product longitudinal direction;
• a waistline retaining unit extending along the product widthwise direction in the front waistline region and the rear waistline region, and configured to hold the disposable diaper onto a body of a wearer;
• a crotch stretch unit that is formed in the crotch region, is completely apart from the waistline retaining unit in the product longitudinal direction, and is configured to expand and contract in at least the product longitudinal direction;
• and
• a pair of leg elastic units respectively formed along the pair of leg hole opening units, the pair of leg elastic units extending in the front and rear waistline regions and being configured to expand and contract in at least the product longitudinal direction;
• wherein
• the crotch stretch unit is positioned on a non-skin contact surface side of the absorber and overlaps the absorber in a product thickness direction of the disposable diaper,
• the leg elastic units are longer than the crotch stretch unit in the product longitudinal direction,
• the crotch stretch unit has a front end and a rear end opposite to the front end in the product longitudinal direction,
• the pair of leg elastic units continuously extends, in the product longitudinal direction, beyond the front and rear ends of the crotch stretch unit,
• each of the leg elastic units is provided at an outer side from the crotch stretch unit in the product widthwise direction,
• a low stretch region having a lower ratio of expansion and contraction than the crotch stretch unit is formed between each of the leg elastic units and the crotch stretch unit,
• the crotch stretch unit is formed of an elastic sheet,
• the absorber includes an absorbent core, and
• in a natural state of the disposable diaper, a difference between a width of the absorbent core and a width of the elastic sheet of the crotch stretch unit in the product widthwise direction with respect to the width of the absorbent core is within 20%.

A disposable diaper, comprising:

• a front waistline region;
• a rear waistline region;
• a crotch region positioned between the front waistline region and the rear waistline region;
• a pair of leg hole opening units;
• an absorber running across the crotch region and extending in the front waistline region and the rear waistline region;
• a product longitudinal direction from the front waistline region towards the rear waistline region;
• a product widthwise direction that is perpendicular to the product longitudinal direction;
• a waistline retaining unit extending along the product widthwise direction in the front waistline region and the rear waistline region, and configured to hold the disposable diaper onto a body of a wearer;
• a crotch stretch unit that is formed in the crotch region, is completely apart from the waistline retaining unit in the product longitudinal direction, and is configured to expand and contract in at least the product longitudinal direction;
• and
• a pair of leg elastic units respectively formed along the pair of leg hole opening units, the pair of leg elastic units extending in the front and rear waistline regions and being configured to expand and contract in at least the product longitudinal direction;
• wherein
• the crotch stretch unit is positioned on a non-skin contact surface side of the absorber and overlaps the absorber in a product thickness direction of the disposable diaper,
• the leg elastic units are longer than the crotch stretch unit in the product longitudinal direction,
• the crotch stretch unit has a front end and a rear end opposite to the front end in the product longitudinal direction,
• the pair of leg elastic units continuously extends, in the product longitudinal direction, beyond the front and rear ends of the crotch stretch unit,
• each of the leg elastic units is provided at an outer side from the crotch stretch unit in the product widthwise direction,
• a low stretch region having a lower ratio of expansion and contraction than the crotch stretch unit is formed between each of the leg elastic units and the crotch stretch unit,
• the crotch stretch unit is formed of an elastic sheet,
• the absorber includes an absorbent core, and
• in a natural state of the disposable diaper, a width of the elastic sheet of the crotch stretch unit in the product widthwise direction is at least 50% of a width of the absorbent core in the product widthwise direction.

A disposable diaper, comprising:

• a front waistline region;
• a rear waistline region;
• a crotch region positioned between the front waistline region and the rear waistline region;
• a pair of leg hole opening units;
• an absorber running across the crotch region and extending in the front waistline region and the rear waistline region;
• a product longitudinal direction from the front waistline region towards the rear waistline region;
• a product widthwise direction that is perpendicular to the product longitudinal direction;
• a waistline retaining unit extending along the product widthwise direction in the front waistline region and the rear waistline region, and configured to hold the disposable diaper onto a body of a wearer;
• a crotch stretch unit that is formed in the crotch region, is completely apart from the waistline retaining unit in the product longitudinal direction, and is configured to expand and contract in at least the product longitudinal direction;
• and
• a pair of leg elastic units respectively formed along the pair of leg hole opening units, the pair of leg elastic units extending in the front and rear waistline regions and being configured to expand and contract in at least the product longitudinal direction;
• wherein
• the crotch stretch unit is positioned on a non-skin contact surface side of the absorber and overlaps the absorber in a product thickness direction of the disposable diaper,
• the leg elastic units are longer than the crotch stretch unit in the product longitudinal direction,
• the crotch stretch unit has a front end and a rear end opposite to the front end in the product longitudinal direction,
• the pair of leg elastic units continuously extends, in the product longitudinal direction, beyond the front and rear ends of the crotch stretch unit,
• each of the leg elastic units is provided at an outer side from the crotch stretch unit in the product widthwise direction,
• a low stretch region having a lower ratio of expansion and contraction than the crotch stretch unit is formed between each of the leg elastic units and the crotch stretch unit,
• the crotch region includes a first notch extending in the product widthwise direction, and a second notch extending in the product widthwise direction, and
• the crotch stretch unit is between the first and second notches in the product longitudinal direction.