Integrally Molded Hooks on Nonwoven Web for Diaper Fastening
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Solution Overview
Problem
Current hook-and-loop fastening systems for disposable diapers require separate processing and handling of hook materials, which can be inefficient and limit the flexibility in design and manufacturing.
Innovation Solution
A method of forming nonwoven web material with integrally molded hooks and loops, where filaments of polymeric material are spun, consolidated, and bonded in a pattern of thermal bonds, allowing for the direct integration of hooks and loops within the material, eliminating the need for separate hook strips and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate hook materials are used and attached to substrates, then hook-and-loop fastening systems can be manufactured, but processing and handling steps become complex and inefficient
Solution Approach 1:
The patent combines the substrate and hooks into a single integrated nonwoven structure where hooks are formed directly from the polymeric filaments during web formation. This eliminates separate hook materials and attachment steps, directly resolving the contradiction by merging previously separate components into one manufacturing process.
Solution Approach 2:
The nonwoven web material serves multiple functions simultaneously: it provides the substrate structure, contains the hook-forming filaments, and enables fastening functionality. This multi-functionality eliminates the need for separate hook materials and simplifies the overall system, addressing both manufacturing efficiency and process complexity.
2Productivity
If hooks are formed integrally from nonwoven material, then manufacturing efficiency improves, but design flexibility in hook configuration may be limited
Solution Approach 1:
The patent enables different regions of the nonwoven web to have different hook densities, orientations, and distributions by controlling filament placement and bonding patterns in specific areas. This local customization maintains design flexibility while preserving the manufacturing efficiency benefits of integral hook formation.
Solution Approach 2:
The hook configuration can be dynamically adjusted during manufacturing by modifying process parameters such as filament orientation, bonding patterns, and web tension. This dynamic control provides design flexibility without requiring separate hook materials or complex post-processing steps.
3Quantity of substance
If separate hook strips are used, then hook application is standardized, but material costs increase and handling becomes more difficult
Solution Approach 1:
By merging the substrate and hook materials into a single nonwoven web structure, the patent eliminates the need for separate hook strips and their associated handling operations. This integration directly reduces material costs and improves ease of operation by eliminating complex handling steps.
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 approach enhances manufacturing efficiency, reduces material costs, and provides greater design flexibility by allowing hooks and loops to be formed in any desired configuration directly on the nonwoven web, improving the fit and comfort of disposable diapers.
Implementation Method 1
The section of nonwoven web material may comprise filaments of polymeric material having a machine direction bias and consolidated and bonded in a pattern of thermal bonds
Data Source
AI summary
A wearable article includes hook-and-loop fastening components. The hook-and-loop fastening components have a section of nonwoven web material on which an array of hooks is formed. At least some of the hooks may be integrally formed from the nonwoven material. The section of nonwoven web material may also include a section of loops material, wherein at least some of the loops may be integrally formed from the web material. The section of loops material may have a machine direction dimension of at least 20 mm and a cross direction dimension of at least 20 mm, and a surface area of at least 314 mm2. The article may further include an identifiable linear path, the identifiable linear path having a width greater than 2 mm and forming an angle with the machine direction of 45 degrees or less. Any such identifiable path at least partially overlies the loops-forming bond(s), at a plurality of locations along the identifiable linear path.