Sanitary Product Core Assembly for Low-Scrap Hourglass Shapes
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Solution Overview
Problem
The hourglass shape of sanitary products like panty liners and light-inco diapers results in significant scrap of high-grade core materials due to the inability to define cutting patterns with fully shared boundaries, leading to environmental and economic inefficiencies.
Innovation Solution
A machine and method that cuts and assembles core materials into oppositely tapering figures, which are then laid onto a carrier material to form hourglass shapes with minimal waste, using spacer devices to stagger and space the figures in the machine and cross directions, followed by embossing and bonding with a backing material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If hourglass shaped sanitary products are manufactured using conventional cutting patterns, then the product shape and functionality are achieved, but significant scrap of high-grade core materials is generated
Solution Approach 1:
The hourglass-shaped absorbent core is segmented into multiple individual core portions that are arranged in a staggered pattern on the web. Each core portion corresponds to a sanitary product and is separated from adjacent portions, allowing efficient utilization of the web material and minimizing scrap generation while maintaining the required hourglass shape for each product.
2Ease of manufacture
If conventional cutting patterns are used for hourglass shaped products, then manufacturing is simplified, but scrap generation increases significantly
Solution Approach 1:
The invention transitions from conventional linear cutting patterns to a two-dimensional staggered arrangement of core portions on the web. By utilizing both the machine direction and cross direction for pattern arrangement, the system achieves near 100% material utilization while maintaining ease of manufacture through standardized cutting and assembly processes.
3Reliability
If high-grade core materials are used for hourglass shaped products, then product performance is improved, but economic costs increase due to scrap disposal
Solution Approach 1:
The invention minimizes the discarding of high-grade core materials by implementing a staggered pattern arrangement that allows nearly complete utilization of the web material. The spacer portions between core portions are optimized to be minimal, thereby recovering and utilizing almost all valuable core material in the final product while maintaining high product performance.
Data Source
AI summary
A machine and a method for manufacturing sanitary product with an hourglass shaped absorbent core, such as a panty liner or a light-inco diaper. The machine and the method allow shaping of the core into an hourglass shape with minimized scrap.