Absorbent structure
View Patent ↗An absorbent structure with a sequence of two layers includes at least one liquid absorption layer, a subsequent liquid storage layer with super absorbent polymer particles and super absorbent polymer fibers, and a subsequent liquid distribution layer. The layers are connected and form a sheet structure. The liquid storage layer has its super absorbent polymer extending from the liquid storage layer into the liquid distribution layer in order to generate a return suction effect for the liquid that has passed through the liquid absorption layer and liquid storage layer into the liquid distribution layer.
1. A method for producing an absorbent structure, comprising at least the following steps:
depositing a first layer for configuring a liquid absorption layer which includes at least cellulose;
depositing a second layer which is air laid for configuring a liquid storage layer which includes at least cellulose fibers and super absorbent polymer chosen from the group consisting of super absorbent polymer particles and super absorbent polymer fibers;
depositing a third layer which is air laid for forming a liquid distribution layer;
moving at least one of the first, second and third layers through a heating device in order to bond the same;
supplying at least one of the first, second and third layers to a calender including at least one smooth roller and an opposite roller which form a calender gap; and
compressing the at least one of the first, second and third layers within the calender gap, whereby the super absorbent polymer protrudes from the liquid storage layer into the liquid distribution layer and forms a liquid removing contact between the liquid storage layer and the liquid distribution layer, wherein more than 20% of the super absorbent polymer arranged in the liquid storage layer protrudes into the liquid distribution layer.
2. The method according to claim 1 , wherein the first layer is an air laid layer which includes cellulose fibers and bi component fibers.
3. The method according to claim 1 , wherein the first layer is air laid layer which includes a highly voluminous fleece layer from thermoplastic fibers.
4. The method according to claim 1 , further including the step of applying a bonding agent layer on at least one of the first, second and third layers.
5. The method according to claim 4 , wherein the bonding agent layer is a latex layer.
6. The method according to claim 1 , wherein, in the supplying step, the first, second and third layers are supplied to the calender gap and, in the compressing step, the first, second and third layers are compressed in the calender gap.
7. The method according to claim 1 , wherein the opposite roller has protrusions.