Method of manufacturing a composite superabsorbent core structure
Methods related to forming superabsorbent composite core structures using superabsorbent materials, such as superabsorbent polymers (SAP). In one method superabsorbent material is sprayed simultaneously with an adhesive to form a superabsorbent layer adhered to a first flexible sheet of material. A second flexible sheet of material is applied to the superabsorbent layer to position the superabsorbent layer between the first and second flexible sheets of material. At least one of the first or second flexible sheets of material is liquid permeable to allow liquid to penetrate into the superabsorbent layer from outside the composite product.
1. A method of forming a composite superabsorbent core structure, comprising:
spraying a first plurality of foamed adhesive filaments toward a first flexible sheet of material, the filaments having an average diameter;
spraying particles of a superabsorbent particulate material toward the first flexible sheet of material, the particles having an average diameter greater than the average diameter of the filaments;
mixing the filaments and the particles in an area spaced from the first flexible sheet of material such that the filaments partially coat the particles while leaving surface area portions of the particles uncoated;
applying the partially coated particles and adhesive to the first flexible sheet of material to form a superabsorbent layer; and
applying a second flexible sheet of material directly or indirectly to the superabsorbent layer to position the superabsorbent layer between the first and second flexible sheets of material, wherein at least one of the first or second flexible sheets of material is liquid permeable to allow liquid to penetrate into the superabsorbent layer, contact the uncoated surface area portions and become absorbed by the superabsorbent particulate material.
2. The method of claim 1 , wherein the liquid permeable sheet or sheets further comprise a nonwoven material.
3. The method of claim 1 , further comprising:
manufacturing a disposable hygienic product using the superabsorbent core structure.
4. The method of claim 1 , wherein the spraying the superabsorbent particulate material further comprises spraying a powder form of SAP.
5. The method of claim 1 , wherein one of the first or second sheets is liquid impervious.
6. The method of claim 1 , further comprising:
spraying a second plurality of adhesive filaments toward the first flexible sheet of material, the second plurality of adhesive filaments comprised of filaments having an average diameter less than the average diameter of the particles; and
mixing the adhesive filaments from the first and second pluralities of adhesive filaments with the particles to partially coat the particles while leaving surface area portions of the particles uncoated.
7. The method of claim 6 , wherein spraying the first and second pluralities of adhesive filaments further comprises:
spraying the first and second pluralities of adhesive filaments in first and second generally linear arrays.
8. The method of claim 7 , further comprising:
spraying the first and second pluralities of adhesive filaments in a converging manner toward the particles of superabsorbent particulate material.
9. The method of claim 8 , wherein spraying the second plurality of adhesive filaments further comprises spraying foamed adhesive filaments.
10. The method of claim 6 , wherein spraying the second plurality of adhesive filaments further comprises spraying foamed adhesive filaments.