Integral Micro-Hook Tabs on Elastic Laminate
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Solution Overview
Problem
Existing methods for producing elastic side panels for absorbent sanitary articles require complex and expensive equipment due to the need for discrete micro-hook pads, which are costly and cause discomfort due to their sharp edges.
Innovation Solution
A transversely extensible continuous elastic laminate is produced in-line during the manufacturing process, eliminating the need for discrete micro-hook tapes and allowing for better control over tab spacing, reducing waste and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If discrete micro-hook pads are used, then fastening function is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the micro-hook pad and support web into a single integral non-woven structure. The micro-hooks are formed directly on the support web through ultrasonic welding or heat sealing, eliminating the need for separate micro-hook tapes and complex application equipment. This integration simplifies the manufacturing process while maintaining the fastening function.
Solution Approach 2:
The support web serves dual functions: it provides structural support and simultaneously forms the micro-hooks through integral construction. The material itself creates the fastening elements during the web formation process, eliminating the need for external micro-hook tape application systems and reducing equipment complexity.
2Ease of manufacture
If discrete micro-hook pads are used, then fastening function is achieved, but production costs increase
Solution Approach 1:
By combining the micro-hook forming step with the support web manufacturing process, the patent eliminates the need for separate micro-hook tape materials and reduces material handling costs. The integral construction uses a single non-woven material for both support and fastening functions, reducing overall material costs.
Solution Approach 2:
The patent uses a disposable non-woven support web that is inexpensive to manufacture and can be discarded after use. This single-use approach with integral micro-hooks eliminates the need for expensive reusable micro-hook tapes and complex application equipment, reducing overall production costs.
3Object-affected harmful factors
If micro-hook pads extend to edges of support web, then fastening coverage is maximized, but user comfort decreases due to sharp edges
Solution Approach 1:
The patent applies different properties to different regions of the fastening tab. The micro-hooks are concentrated in the central region where fastening is needed, while the edges of the support web are left as soft, rounded non-woven material without micro-hooks. This local differentiation maintains fastening effectiveness while eliminating sharp edges that cause discomfort.
Solution Approach 2:
Instead of extending micro-hooks to the edges of the support web as in conventional designs, the patent inverts the approach by limiting micro-hooks to the central region and leaving the edges as soft material. This inversion solves the comfort problem while maintaining adequate fastening coverage through the central micro-hook region.
4Device complexity
If continuous micro-hook tapes are cut into discrete pads, then fastening tabs are formed, but manufacturing complexity increases
Solution Approach 1:
The support web manufacturing process automatically creates the micro-hooks through integral construction during web formation. The extrusion or web-making equipment directly forms the micro-hook structure as part of the support web, eliminating the need for separate cutting, spacing, and application operations for discrete micro-hook pads.
Solution Approach 2:
The patent combines the support web formation and micro-hook creation into a single manufacturing step. The integral construction process creates both the support structure and fastening elements simultaneously, eliminating the need for separate operations to cut, space, and apply discrete micro-hook pads from continuous tapes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution simplifies the manufacturing process, reduces costs, and improves user comfort by eliminating sharp edges, while also enhancing sustainability through reduced material handling and transportation.
Implementation Method 1
a single continuous elastic tape overlapped to the central portion 12 of the first web 10. The elastic tape is elastically stretched in a direction Y transversal to the longitudinal direction X
Implementation Method 2
The first web 10, the second web 30, the two elastic tapes 18 are fixed to each other by a pattern of spot welds 40
Data Source
AI summary
A transversely extensible continuous elastic laminates includes a continuous elastic tape sandwiched between two continuous webs, and at least one row of tabs extending transversely outside the two webs, wherein the tabs are made of a non-woven material and have respective micro-hook pads integrally formed in the non-woven material forming the tabs and completely surrounded by a portion of a flat surface of the respective tabs.