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An elasticized waist diaper in which a layer of elastic material is positioned in an opening in the waist area of a diaper. The elastic layer is located such that it forms a portion of the waist edge of the diaper. The elastic layer may be formed from the same piece of elastic material as is used fo

An elasticized waist diaper in which a layer of elastic material is positioned in an opening in the waist area of a diaper. The elastic layer is located such that it forms a portion of the waist edge of the diaper. The elastic layer may be formed from the same piece of elastic material as is used for the diaper leg elastic.

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1. In a disposable diaper having a liquid permeable top sheet for placement adjacent a body, a liquid impermeable backsheet joined to said topsheet, an absorbent pad disposed between said sheets, front and rear waist area at opposite ends of the diaper, a pair of side edges extending the length of t

1. In a disposable diaper having a liquid permeable top sheet for placement adjacent a body, a liquid impermeable backsheet joined to said topsheet, an absorbent pad disposed between said sheets, front and rear waist area at opposite ends of the diaper, a pair of side edges extending the length of the diaper, front and rear waist edges formed by the joined sheets and extending the width of the diaper, and fastening means secured to one of said waist areas for connecting the front and rear waist areas together, the improvement wherein a waist area includes an opening in both of the joined sheets, said opening intersecting a waist edge, and an elastic layer disposed in said opening and forming a part of said waist edge, said elastic layer being joined to at least one of said sheets whereby the waist area may be effectively stretched and tightened when tension is applied to the waist area by the fastening means during connection of the front and rear waist areas. 2. The diaper according to claim 1 wherein said absorbent pad has two side edges defining a variable pad width and at least a portion of said elastic layer is positioned laterally outside of the space between two planes parallel to the length of the diaper and respectively passing through a different one of said pad side edges at any point along the length of the side edge. 3. The diaper according to claim 1 wherein said elastic layer is positioned laterally of the absorbent pad. 4. The diaper according to claim 1 wherein only the elastic layer forms the waist edge in the area of the opening. 5. The diaper according to claim 1 wherein said diaper has at least one laterally extending ear at an end of the diaper and said elastic layer is positioned in said ear. 6. The diaper according to claim 5 wherein said elastic layer is positioned laterally of the absorbent pad. 7. The diaper according to claims 5 or 6 wherein said ear has an edge running at least partially in a lateral direction relative to the length of the diaper and comprising a portion of the side edge of the diaper, said ear being pivotally movable about the area of the ear positioned between the elastic layer and said ear edge. 8. The diaper according to claims 5 or 6 wherein the absorbent pad extends into an ear at one end of the diaper and does not extend into an ear at the opposite end of the diaper. 9. The diaper according to claims 1, 5 or 6 wherein at least one of said sheets is non-elastic relative to said elastic layer, the elastic layer has an end spaced from the waist edge partially formed by such elastic layer, and a portion of said joined sheets positioned between a side edge of the diaper and the elastic layer is pivotally movable about the area of the diaper adjacent to the end of the elastic layer. 10. The diaper according to claims 1, 5 or 6 wherein said diaper further comprises a leg area intermediate said waist areas, an elastic strip in each leg area adjacent a side edge and extending in the direction of the length of the diaper, said elastic layer being positioned substantially in alignment with the direction of the elastic strip most adjacent the elastic layer. 11. The diaper according to claims 1, 5 or 6 wherein a strip of elastic material is positioned along at least a portion of one of said side edges intermediate said waist areas, and said elastic layer and elastic strip comprise the same piece of elastic material. 12. The diaper according to claims 1, 5 or 6 wherein at least one of said sheets is non-elastic relative to said elastic layer, said waist area being in a tensile stressed condition due to the connection of the front and rear waist area together, said tensile stress decreasing with increasing distance from the waist edge in the direction of the length of the diaper, and the elastic layer has a sufficient length parallel to the length of the diaper beyond the area of application to such tensile stress to eliminate any restraint to the stretching of the elastic layer by the non-elastic sheet. 13. The diaper according to claim 12 wherein said diaper further comprises a leg area intermediate said waist areas, an elastic strip in each leg area adjacent a side edge and extending in the direction of the length of the diaper, said elastic layer being positioned substantially in alignment with the direction of the elastic strip most adjacent the elastic layer. 14. The diaper according to claim 12 wherein the elastic layer has a width less than its length. 15. The diaper according to claim 14 wherein the width of the elastic layer decreases with increasing distance from the waist edge partially formed by the elastic layer. 16. The diaper according to claim 12 wherein the elastic layer has an end spaced from the waist edge partially formed by such elastic layer and the portion of said joined sheets positioned between a side edge of the diaper and the elastic layer are pivotally movable about the area of the diaper adjacent to the end of the elastic layer. 17. The diaper according to claim 12 wherein the diaper has at least one laterally extending ear at an end of the diaper, said ear having an edge running at least partially in a lateral direction relative to the length of the diaper and comprising a portion of the side edge of the diaper, the elastic layer being positioned in said ear, said ear being pivotally movable about the area of the ear between the elastic layer and the lateral ear edge. 18. The diaper according to claim 17 wherein the absorbent pad extends into an ear at one end of the diaper and does not extend into an ear at the opposite end of the diaper. 19. In a disposable diaper having a liquid permeable top sheet for placement adjacent a body, a liquid impermeable backsheet joined to said topsheet, an absorbent pad disposed between said sheets, front and rear waist areas at opposite ends of the diaper, a leg area intermediate the waist area, a strip of elastic material positioned along each of said side edges in the leg area for providing an elasticized snug fit at the leg area, the improvement wherein a waist area includes an opening in both of the joined sheets, a layer of elastic material is disposed in said opening for providing an elasticized snug fit at the waist area and, at one stage in the fabrication of the diaper, the elastic layer and said elastic strip comprise different portions of the same piece of elastic material. 20. The diaper according to claim 19 wherein, at a later stage in the fabrication of the diaper, said piece of elastic material is discontinuous between said elastic layer and said elastic strip.