Disposable diapers with main channels and secondary channels

A disposable diaper having a backsheet, a topsheet and an absorbent core disposed therebetween, and an acquisition layer disposed between the absorbent core and topsheet, wherein the absorbent core comprises at least one absorbent structure comprising a substrate layer and an absorbent layer comprising absorbent material, the absorbent layer comprising:

• i. a width, N, extending in a transverse dimension and a length, M, extending in a longitudinal dimension;
• ii. front, crotch and back regions arranged sequentially in the longitudinal dimension;
• and
• iii. two longitudinal portions delimited by a central longitudinal axis of the absorbent structure;
• wherein the absorbent layer comprises at least two main channels substantially free of the absorbent material extending through the thickness of the absorbent layer and at least present in the crotch region;
• and at least two secondary channels substantially free of the absorbent material extending through the thickness of the absorbent layer, and wherein the secondary channels are shorter than the main channels;
• wherein the absorbent layer does not comprise channels substantially free of absorbent polymer particles extending up to longitudinal or transverse edges of the absorbent layer;
• and
• the disposable diaper further comprising a second absorbent structure having a second substrate layer and a second absorbent layer comprising absorbent material and channels substantially free of the absorbent material extending through the thickness of the second absorbent layer, wherein the absorbent layer and the second absorbent layer are mirror images of each other and are combined in a laminate such that the channels of the second absorbent layer superpose the channels of the absorbent layer to form channels through the thickness of the laminate.