Patent ID: 7449017

Claim:
A disposable paper diaper comprising: a main diaper sheet having a back side portion with opposing side portions and an abdomen side portion: fastening sheets each respectively arranged at a respective one of said side portions of the back side of the paper diaper and each including: a fastening sheet outer side edge distal from said main diaper sheet; joint ears extending from the fastening sheet outer side edge to protrude sideward from the main diaper sheet from at an upper position and a lower position on said fastening sheet, said joint ears each having a joint ear inner side surface which faces toward an infant when the paper diaper is worn; one of adhesive layers or facing fasteners disposed on the joint ear inner side surfaces of said joint ears and removably fastenable to the abdomen side portion of the paper diaper so as to secure the diaper to the infant; and said fastening sheet defining perforations forming a tear line leading from the fastening sheet outer side edge at a position between said joint ears at said upper and lower positions and toward said main diaper sheet and to a perforations end point, wherein said perforations include: a first perforation section extending from the fastening sheet outer side edge to an intermediate point configured to form a first tear line section of said tear line as a high tearing strength section having a high tearing strength and a relatively coarse perforation interval and a second perforation section from said intermediate point toward said diaper main sheet and to said perforations end point, said second perforation section being configured to form a second tear line section as a low tearing strength section having a low tearing strength, less than said high tearing strength, and a relatively fine perforation interval which is finer than said coarse perforation interval.