Laminate absorbent core for use in absorbent articles
The invention relates to absorbent cores having high amounts of superabsorbent polymer material which are immobilized by adhesive. The absorbent cores have reduced peak force when subjected to the Laminate Compression Extension Test Method and also exhibit reduced delamination upon swelling of the superabsorbent polymer material.
1. A laminate absorbent core comprising:
a first, lower laminate layer and a second, upper laminate layer,
the first, lower laminate layer comprising a first carrier substrate and the second, upper laminate layer comprising a second carrier substrate, wherein superabsorbent polymer material forms multiple stripes on each of the first and second carrier substrates, the stripes being spaced apart from each other to form gaps between neighboring stripes,
the second laminate layer being positioned on the first laminate layer with the first and second carrier substrates facing outwardly, such that the superabsorbent polymer material stripes of the second laminate layer are overlaying the gaps formed in the first laminate layer and the superabsorbent polymer material stripes of the first laminate layer are overlaying the gaps formed in the second laminate layer,
wherein each gap in the first laminate layer is wider than the superabsorbent polymer material stripe of the second laminate layer lying above the gap,
and each gap in second laminate layer is wider than the superabsorbent polymer material stripe of the first laminate layer lying below the gap, such that the superabsorbent polymer material stripes of the first and second laminate layers do not overlap and an interstice is formed, wherein the interstice extends between the first and second carrier substrates and is substantially free of superabsorbent polymer material,
wherein the superabsorbent polymer material is at least partially immobilized by a first adhesive, the first adhesive forming a fibrous layer between the first and second laminate layer.
2. The laminate absorbent core according to claim 1 , wherein a second adhesive is applied onto the first and second carrier substrate of the first and second laminate layer such that the second adhesive is applied in the gaps between the superabsorbent polymer material stripes and below the superabsorbent polymer material stripes of the respective laminate layer, and wherein the first adhesive is in contact with the second adhesive in the regions of the gaps.
3. The laminate absorbent core according to claim 1 , wherein a second adhesive forms multiple stripes on each of the first and second carrier substrates of the first and second laminate layer, the stripes of the second adhesive being formed in the gaps between neighboring superabsorbent polymer material stripes such that the first adhesive is in contact with the second adhesive, and wherein the second adhesive stripes extend below the neighboring superabsorbent polymer material stripes of the respective laminate layer by at least 1% and by less than 50% of width of the neighboring superabsorbent polymer material stripe.
4. The laminate absorbent core according to claim 1 , wherein a second adhesive forms multiple stripes on each of the first and second carrier substrates of the first and second laminate layer, the stripes of the second adhesive being formed in the gaps between neighboring superabsorbent polymer material stripes such that the first adhesive is in contact with the second adhesive and wherein, in each of the laminate layers, the second adhesive stripes do not extend into neighboring superabsorbent polymer material stripes.
5. The laminate absorbent core according to claim 1 , wherein the laminate absorbent core comprises less than 5% by weight of cellulose fibers.
6. The laminate absorbent core according to claim 1 , wherein the width of the superabsorbent polymer material stripes in each of the laminate layers is at least 5 mm.
7. The laminate absorbent core according to claim 3 , wherein the width of the second adhesive stripes in each of the laminate layers is at least 1 mm.
8. The laminate absorbent core according to claim 1 , wherein the width of the gaps between the superabsorbent polymer material stripes in each laminate layer is at least 2 mm wider than the width of the superabsorbent polymer material stripe overlaying the respective gap.
9. The laminate absorbent core according to claim 1 , wherein the superabsorbent polymer material stripes of one laminate layer do not contact the superabsorbent polymer material stripes of the respective other laminate layer.
10. The laminate absorbent core according to claim 1 , wherein the laminate absorbent core has a longitudinal direction and a lateral direction, and wherein the superabsorbent polymer material stripes extend in the longitudinal direction.
11. The laminate absorbent core according to claim 1 , wherein the number of superabsorbent polymer material stripes in each laminate layer is from 3 to 8.
12. Absorbent article comprising a topsheet, a backsheet and a laminate absorbent core according to claim 1 .