Folding Apparatus Edge Alignment via Dynamic Suction Control
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Solution Overview
Problem
Existing folding apparatuses for continuous composite webs in absorbent hygiene article production struggle to maintain precise alignment of longitudinal edges post-folding, leading to quality issues due to varying material properties and rigidity, resulting in misalignment and uniformity problems in finished products.
Innovation Solution
A folding apparatus equipped with movable suction belts and adjustable guides, along with a motor-driven contact unit and feedback adjusting system, ensures precise folding and alignment of longitudinal edges by dynamically adjusting positions based on real-time edge position feedback, ensuring optimal folding and product quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed folding treatment is applied to composite webs, then the folding process is simple and consistent, but the longitudinal edges become misaligned when web properties vary
Solution Approach 1:
The folding apparatus employs movable suction belts with adjustable positions that can dynamically adapt to different web properties. The suction belts can be moved along the web width and their suction force can be adjusted, allowing the system to respond to variations in web rigidity and material composition while maintaining precise edge alignment during folding.
Solution Approach 2:
The system incorporates sensors that detect the position of longitudinal edges and provide feedback to the control system. This feedback mechanism allows real-time adjustment of the suction belts and guides to correct any misalignment, ensuring that edges remain precisely positioned even when web properties vary between different composite web types.
2Manufacturing precision
If the folding apparatus is designed for high precision edge alignment, then the folding quality improves, but the device complexity increases
Solution Approach 1:
The folding apparatus uses suction belts with adjustable suction force to hold and guide the web during folding. This pneumatic mechanism provides precise control over web positioning and folding without requiring complex mechanical linkages or actuators, achieving high edge alignment precision while keeping the overall device structure relatively simple.
Solution Approach 2:
The system achieves variable folding treatment by adjusting parameters such as suction belt position, suction force intensity, and guide belt orientation rather than requiring completely different mechanical structures for different web types. This parameter-based adaptability maintains precision while avoiding excessive device complexity.
3Adaptability or versatility
If movable suction belts with adjustment capability are used, then adaptability to different webs improves, but the device complexity and control requirements increase
Solution Approach 1:
The suction belts utilize pneumatic control for adjustment, where suction force and belt position can be modified through simple pneumatic valve control rather than complex mechanical adjustment mechanisms. This approach provides adaptability to different web properties while keeping the adjustment mechanism relatively simple and easy to 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 apparatus achieves precise and uniform folding of composite webs, ensuring that longitudinal edges are accurately superposed, thereby enhancing the quality and consistency of absorbent hygiene articles by adapting to different web properties and maintaining precise alignment throughout the folding process.
Implementation Method 1
The folding section comprises a first movable suction belt and a second movable suction belt
Data Source
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AI summary
A folding apparatus (1) for a continuous web (100) being fed in a plant for the production of hygienic absorbent articles and intended to be folded into a "V" or "U" shape in a first and in a second longitudinal portion (101, 102) according to a longitudinal folding line (L) parallel to a feeding line (D) of the continuous web comprises a folding section (2) comprising a first and a second power-driven, movable suction belt (3, 4) and an adjusting system (5) for adjusting a relative position of the longitudinal edges (100a, 100b) of the continuous web (100) once it has been folded; the adjusting system (5) is configured to adjust the position of the first belt (3) and/or of the second belt (4) depending on at least a first information (11) sent by the first sensor (6) to the computerised control unit (7). [Figure 1]