Transverse Stretching Unit for Elastic Films
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Solution Overview
Problem
Existing methods for producing elastic laminates face challenges in precise positioning of elastic films, flexibility in manufacturing, and the need for multiple manufacturing lines to produce different products, due to complex and inflexible stretching devices.
Innovation Solution
A stretching unit with identical first and second stretching devices, each comprising disk-shaped members rotating about inclined axes, equipped with gripping elements and a single-sided driving assembly, allowing for precise transverse stretching and accurate positioning of elastic films between nonwoven webs, with adjustable mechanisms for flexibility in producing various elastic laminate configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two stretching units are arranged in two distinct areas with angular offset, then elastic films can be stretched and applied to nonwoven web, but positioning precision and spacing control between elastic films deteriorates
Solution Approach 1:
The patent merges the two stretching units into a single integrated device where both stretching members rotate about axes that are coaxial with the anvil wheel axis. This consolidation eliminates the angular offset problem and enables precise positioning and spacing control of the elastic films while maintaining production capability.
2Productivity
If two stretching units are arranged in two distinct areas, then elastic films can be stretched, but the manufacturing line dimensions increase
Solution Approach 1:
By combining both stretching functions into a single device with coaxial rotation axes, the patent significantly reduces the manufacturing line footprint compared to having two separate stretching units arranged in distinct areas, while maintaining full production capability.
3Manufacturing precision
If stretching members rotate about inclined axes, then transverse stretching can be achieved, but device complexity and adjustment difficulty increase
Solution Approach 1:
The patent uses asymmetric arrangement where the stretching members rotate about axes that are coaxial with the anvil wheel but positioned at different radial distances and angular positions. This asymmetric configuration enables transverse stretching while simplifying the driving assembly compared to inclined axes, as all rotations occur about the same central axis.
4Manufacturing precision
If operators perform settings and adjustments on both sides of the unit, then stretching parameters can be controlled, but operational ease deteriorates
Solution Approach 1:
By consolidating both stretching functions into a single device with coaxial rotation, the patent enables operators to perform all settings and adjustments from one side of the unit, eliminating the need to access both sides and significantly improving operational ease while maintaining precise control.
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
The solution enables precise and flexible production of elastic laminates with improved accuracy and reduced manufacturing complexity, allowing for a broader range of products without the need for multiple manufacturing lines.
Implementation Method 1
The outer edges of the first and second stretching members are provided with gripping elements for gripping corresponding side edges of an elastic film
Implementation Method 2
first and second elastic films are stretched in a transverse direction
Data Source
AI summary
A stretching unit for transversely stretching elastic films, including first and second stretching devices each having respective gripping zones and respective release zones, and wherein the release zones of the first and second stretching devices are aligned to each other along a common transverse release line.