Method for manufacturing a shaped sheet laminate
There are provided a shaped sheet laminate that is adapted for an absorbent article and that has a specific structure to enhance the absorbing effect of the absorbent article, a method for manufacturing the shaped sheet laminate, and a shaping apparatus adapted to manufacture the shaped sheet laminate. The shaping apparatus includes a first roller having a rolling surface, a plurality of indentations that are indented from the rolling surface, a plurality of annular inner wall surfaces respectively defining the indentations, and a plurality of suction holes that are in air communication the respective indentations. Each of the annular inner wall surfaces has an annular outer edge that meets the rolling surface.
1. A method for manufacturing a shaped sheet laminate that is adapted for an absorbent article, said method comprising the steps of:
(a) providing a first roller, a second roller, and a third roller, the first roller being integrally formed as one piece and having a continuous rolling surface, a plurality of indentations that are arranged in intersecting rows and that are indented inwardly from the rolling surface, a plurality of annular inner wall surfaces respectively defining the indentations, and a plurality of suction holes that are in air communication with the respective indentations and that are connected to a suction device, each of the annular inner wall surfaces having an annular outer edge that meets the continuous rolling surface, the second roller having a rolling surface that is formed with a plurality of protrusion members thereon, the third roller having a rolling surface;
(b) feeding a top sheet to pass through a first nip zone formed between the first roller and the second roller, wherein each of the protrusion members extends into one of the indentations in the first nip zone, and the top sheet is pressed by the protrusion members and is sucked to contact against the annular inner wall surfaces through the suction holes and the suction device so that the top sheet is formed with a plurality of projection portions corresponding to the indentations of the first roller, and a plurality of indented annular connecting portions each surrounding one of the projection portions, the indented annular connecting portions constituting an interconnecting structure; and
(c) subsequently feeding the top sheet together with a bottom sheet to pass through a second nip defined by the first roller and the third roller, wherein the third roller is heated so that the top sheet and the bottom sheet are melt bonded to each other between the rolling surfaces of the first and third rollers.
2. The method as claimed in claim 1 , wherein said annular outer edge of each of the annular inner wall surfaces has a hexagonal shape.
3. The method as claimed in claim 1 , wherein said annular outer edge of each of the annular inner wall surfaces has an octagonal shape.
4. The method as claimed in claim 1 , further comprising:
providing a heated fourth roller having a rolling surface that is formed with a plurality of spaced-apart pins, and a fifth roller in rolling contact with the fourth roller and having an elastic rolling surface; and
feeding the top and bottom sheets, which have been bonded to each other, to pass through a third nip zone defined by the fourth roller and the fifth roller, wherein the pins extend into the top and bottom sheets to form a plurality of pin holes in the indented annular connecting portions.