Composite Sheet Curved Part Crush Resistance
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Solution Overview
Problem
Conventional composite sheets with recess-protrusion shapes used for absorbing articles face challenges in maintaining a soft feel against the skin while ensuring crush resistance, as they tend to degrade in air permeability or become sticky when made with soft materials.
Innovation Solution
A composite sheet design featuring a first sheet with a curved part and a second sheet that covers the boundary part, forming a space and a protruding part with a flat surrounding area, allowing for a soft feel while making the curved part crush-resistant by supporting it with the protruding part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If soft construction materials are employed to achieve soft feel against the skin, then the soft feel is improved, but the recess-protrusion shape becomes easily crushed causing air permeability degradation or sticky feel
Solution Approach 1:
The patent employs composite materials by combining a first sheet with soft construction materials and a second sheet with relatively rigid construction materials. This composite structure allows the first sheet to provide soft feel against the skin while the second sheet provides crush resistance to the recess-protrusion shape, resolving the contradiction between softness and durability
Solution Approach 2:
The patent applies local quality by having different regions of the composite sheet have different material properties. The first sheet contacts the skin and provides softness, while the second sheet provides structural support and crush resistance. This localized differentiation allows each region to optimize its function without compromising the other
2Ease of operation
If the first sheet is made with soft construction materials for soft feel, then the soft feel is improved, but the recess-protrusion shape is easily crushed degrading air permeability
Solution Approach 1:
The composite structure combines soft and rigid materials to protect the recess-protrusion shape from crushing while maintaining air permeability. The rigid second sheet prevents deformation of the recess-protrusion structure, thereby maintaining air permeability channels open and preventing the sticky feel that would result from material compression
Solution Approach 2:
The patent utilizes curved surfaces in the recess-protrusion shape design, where the first sheet forms curved recesses and the second sheet forms corresponding protrusions. These curved geometries maintain air permeability pathways while distributing mechanical stresses, preventing crushing even when soft materials are used
3Stability of the object's composition
If conventional recess-protrusion shape is used, then the cushioning property is obtained, but the feel against the skin becomes hard when the first sheet is crushed
Solution Approach 1:
The composite sheet structure maintains the cushioning property through the recess-protrusion geometry while preventing hard feel by using soft construction materials in the first sheet that contacts the skin. The rigid second sheet prevents crushing of this soft layer, ensuring the skin-contact surface remains soft while retaining cushioning functionality
Data Source
AI summary
Provided are a composite sheet whose recess-protrusion shape can easily be made crush-resistant in a state that the soft feel against the skin is maintained, and a device and method for manufacturing said composite sheet. A first sheet has a curved part in which one surface thereof rises and the other surface thereof is recessed, and a boundary part adjacent to the curved part. A second sheet is joined to the boundary part of the first sheet so as to cover the other surface of the curved part. A region of the second sheet facing the curved part has a protruding part in which an inside surface on the first sheet side rises so as to approach the curved part and an outside surface on the reverse side thereof is recessed, and a flat part surrounding the periphery of the protruding part.