Stretchable Absorbent Structure Using Low-Adhesion Nonwoven Fabric

The patent applies local quality by making one of the sheet layers (either first or second sheet layer) have low adhesion to hot melt adhesive in specific regions. This is achieved by selecting nonwoven fabric with specific properties (such as hydrophobic treatment or specific fiber composition) that repel adhesive in areas where pleats should form, while allowing adhesion in bonding regions. This local differentiation prevents unintended adhesion at pleat locations while maintaining bonding strength where required.

The patent inverts the conventional approach by intentionally creating low-adhesion areas where high adhesion would normally be expected for bonding. Instead of applying adhesive uniformly or avoiding it entirely in pleat regions, the invention makes the sheet layer itself resistant to adhesive in those specific locations, reversing the typical adhesive application strategy to solve the precision problem.

The patent implements local quality by creating spatial variation in adhesive properties across the sheet layer. One sheet layer is designed with low-adhesion characteristics in regions where pleats will form, while maintaining normal adhesion properties in bonding regions. This allows continuous adhesive application for reliability while preventing unintended adhesion through local material property differentiation.

The patent converts the harmful effect of adhesive stringiness and scattering into a beneficial outcome. By designing one sheet layer with low-adhesion properties, the inevitable adhesive overflow and scattering are naturally contained or repelled in pleat regions, transforming what would be a manufacturing defect into a self-correcting feature that prevents unintended adhesion.

The patent applies local quality by differentiating the adhesive properties of the two sheet layers. One sheet layer is selected with low-adhesion characteristics (through fiber composition, hydrophobic treatment, or surface treatment) specifically in regions where pleats will form, while the other sheet layer maintains high adhesion. This creates a functional gradient that enables strong bonding where needed while preventing unintended adhesion in pleat areas.

The patent uses composite materials by combining nonwoven fabrics with different adhesive properties in a single structure. The first sheet layer and second sheet layer are made of different materials or treatments, creating a composite system where one layer provides strong adhesion for bonding while the other provides low adhesion for pleat formation, achieving both bonding strength and pleat precision simultaneously.