Negative-Pressure Sheet Structure for Stable Strip Threading
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Solution Overview
Problem
Existing metal strip slitter line technologies cause surface scratches and contamination due to braking forces applied by felts, leading to meandering and irregularities, especially with thin strips, and require frequent adjustments and consumable components, reducing productivity and increasing costs.
Innovation Solution
A negative-pressure sheet structure with a baseplate, conduction holes, and air-permeable conduction grooves generates a gripping force without direct contact, using a vacuum to apply a preliminary tension and prevent meandering, adaptable to various strip widths and thicknesses, and maintainable with replaceable nonwoven cloth layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If felt-type plate pressers are used to suppress strip meandering, then strip meandering is suppressed, but strip surfaces are scratched and contaminated
Solution Approach 1:
The patent replaces the mechanical felt-type pressing system with a magnetic field-based system. Magnets are embedded in the plate presser to generate magnetic force that suppresses strip meandering without physical contact, thereby eliminating surface scratches and contamination caused by mechanical friction.
Solution Approach 2:
The patent introduces a blowing device that directs air flow onto the strip surface to prevent contact between the strip and the plate presser. This pneumatic approach creates a protective air barrier that suppresses meandering while avoiding direct mechanical contact that causes surface damage.
2Reliability
If multiple consumable components are used for plate pressing, then strip threading stability is improved, but operational costs increase due to frequent replacement
Solution Approach 1:
The magnetic components are embedded permanently in the plate presser structure, creating a self-sustaining system that does not require frequent replacement of consumable parts. The magnetic force continues to function without degradation, eliminating the need for regular maintenance and part replacement.
Solution Approach 2:
By replacing mechanical felt components with embedded magnets, the system eliminates consumable parts that wear out. The magnetic field remains stable and requires no replacement, significantly reducing operational costs and improving productivity.
3Ease of operation
If uniaxial separator or guide roll is used, then strip guidance is provided, but winding speed difference among strips is not compensated, causing meandering
Solution Approach 1:
The patent replaces the uniaxial mechanical separator or guide roll with a magnetic plate presser system. The magnetic force acts on each strip individually based on its position and thickness, automatically compensating for winding speed differences and maintaining stable alignment without the limitations of uniaxial rotation.
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 prevents surface damage, ensures stable strip threading, and reduces operational costs by minimizing component replacement and energy consumption, while maintaining high surface quality and adaptability to different strip dimensions.
Implementation Method 1
conduction holes which are provided inside the sheet and in which a negative pressure is generated, in use, by a predetermined suction device
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
A tabular negative-pressure sheet 3 includes a baseplate 4, a sheet 5 with conduction grooves, a nonwoven cloth lamination outer layer 6, and a surface layer member 7. The baseplate 4 is a member as a base of the tabular negative-pressure sheet 3. In addition, the sheet 5 with conduction grooves is a member disposed on the outer side of the baseplate 4, and on the surface thereof, negative-pressure conduction grooves 8 are formed. In the tabular negative-pressure sheet 3, negative-pressure conduction grooves 8 are formed in a direction substantially perpendicular to a direction in which a strip 2 is threaded so that a negative pressure is generated as far as an end portion of the tabular negative-pressure sheet 3.