Trapezoidal Flap Orientation and Nesting in Sanitary Article Production
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Solution Overview
Problem
Existing methods for producing absorbent sanitary articles, such as nappies, face challenges in handling and securing flaps, especially for adults, due to size constraints and require invasive gluing or fixing processes, which complicates production and increases waste.
Innovation Solution
A method involving feeding continuous webs of material to create trapezoidal pieces with alternating orientations, rotating them to align correctly, and folding the long bases under the top sheet for secure fixation to the chassis, minimizing space and waste, and allowing for efficient production of nappies for both children and adults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flaps are positioned and fixed directly on the outside face of the chassis by gluing, then the flaps maintain their position after pulling action, but the manufacturing process becomes complex and invasive
Solution Approach 1:
The flap pieces are folded beneath the top sheet, nesting them within the existing structure rather than attaching them to the exterior. This eliminates the need for separate gluing operations while maintaining secure positioning, as the flaps are held in place by the folding action and integration with the top sheet.
Solution Approach 2:
The flaps are designed to be self-securing through their own folding action. By folding the long bases beneath the top sheet, the flaps create their own fixation mechanism without requiring external adhesives or fastening systems, thereby simplifying the manufacturing process while ensuring reliable positioning.
2Ease of operation
If traditional handling and positioning methods are used for flaps, then positioning can be achieved, but the method is difficult to implement for adult nappies due to size constraints
Solution Approach 1:
The solution moves from two-dimensional positioning on the surface to three-dimensional integration by folding the flaps beneath the top sheet. This dimensional change allows the same method to accommodate various flap sizes effectively, as the folding mechanism naturally adapts to different dimensions without requiring separate handling procedures for children's and adult nappies.
3Shape
If cutting operations are performed to create flaps, then the flaps can be shaped and positioned, but waste material is generated
Solution Approach 1:
The continuous web of material serves multiple functions: it forms the main body of the nappy, provides the top sheet, and yields the flap pieces through cutting. By utilizing the same continuous web for multiple purposes and implementing precise cutting patterns, the design maximizes material utilization and minimizes waste while achieving the required flap shapes.
Data Source
AI summary
A method for making sanitary articles, includes: feeding along a longitudinal direction of movement a first web of material defining a main body of the article; feeding a pair of longitudinal strips; dividing each strip into a succession of trapezoidal pieces adjacent each other and each having a long base and a short base so the pieces of each strip can be divided alternately into first pieces having a first orientation and second pieces having a second orientation opposite to the first orientation; spacing the pieces of each strip from each other; rotating the first or second pieces of each strip by 180° in plane to give the pieces of the first strip the first orientation and the pieces of the second strip the second orientation; applying each piece on a first face so the long base protrudes laterally from the edge of the first web.