Sheet Correcting Device Curved Surface Segmentation
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Solution Overview
Problem
Existing sheet correcting devices fail to effectively address cockling (waving) deformations in sheets due to localized swelling after liquid application, as they either do not provide sufficient tension and heating uniformly across the sheet.
Innovation Solution
A sheet correcting device featuring a plurality of curved surface members and pressing members that apply tension and heat to the sheet, with a belt pair sandwiching the sheet between upper and lower belts to deform it along curved surfaces, ensuring even tension and heating across the sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single pressing member is used to press the sheet against the curved surface, then the device structure is simple, but the sheet tension is insufficient and cockling correction is ineffective
Solution Approach 1:
The pressing mechanism is divided into multiple pressing members (first pressing member and second pressing member) that are separately disposed along the conveyance direction. Each pressing member independently presses the sheet against different sections of the curved surface, providing distributed tension and improved cockling correction effectiveness without requiring a single complex high-force mechanism.
2Reliability
If the sheet is not heated uniformly, then the heating system is simple, but the adhesion to subsequent rollers is insufficient
Solution Approach 1:
The heating system is segmented into multiple heating regions corresponding to different sections of the curved surface. Each heating region applies heat locally where the sheet contacts the curved surface, ensuring uniform overall heating through distributed thermal zones rather than a single large heating element, thereby improving adhesion reliability.
Solution Approach 2:
The sheet is heated in advance while it is being deformed along the curved surface before it reaches the subsequent rollers. This preliminary heating ensures the sheet has sufficient temperature and adhesion properties when it contacts the rollers, preventing adhesion issues downstream.
3Manufacturing precision
If a single curved surface member is used, then the device structure is simple, but the sheet deformation is insufficient to correct cockling
Solution Approach 1:
The curved surface correction mechanism is segmented into multiple curved surface members (first curved surface member and second curved surface member) disposed along the conveyance direction. Each curved surface member provides a specific radius of curvature and deformation zone, creating a progressive correction effect that gradually flattens the sheet while maintaining structural simplicity through modular repetition.
Solution Approach 2:
The invention utilizes curved surfaces with specific radii to deform the sheet in a controlled manner. The curved surface members provide continuous contact and gradual deformation, which is more effective for correcting cockling than flat or angular surfaces, as the curvature distributes the deformation stress evenly across the sheet.
4Manufacturing precision
If tension is not applied uniformly across the sheet, then the tensioning mechanism is simple, but cockling correction is ineffective
Solution Approach 1:
The tensioning function is segmented and distributed across multiple pressing members that are spaced along the conveyance direction. Each pressing member applies localized tension at its specific position, and the cumulative effect of these distributed tension zones creates uniform overall tension across the entire sheet, effectively correcting cockling without requiring a single complex high-force tensioning mechanism.
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 device effectively corrects cockling deformations by applying uniform tension and heat to both liquid-applied and non-applied portions of the sheet, reducing curling and improving adhesion to subsequent rollers.
Implementation Method 1
a heater to heat the sheet that is deformed by the curved surfaces of the plurality of curved surface members
Implementation Method 2
a sheet tensioner to apply tension to the sheet
Data Source
AI summary
A sheet correcting device includes a plurality of curved surface members including curved surfaces, respectively, to deform a sheet along the curved surfaces, the plurality of curved surface members disposed along a conveyance direction of the sheet, a plurality of pressing members disposed facing the curved surfaces of the plurality of curved surface members, respectively, to press the sheet against the curved surfaces of the plurality of curved surface members, respectively, a sheet tensioner to apply tension to the sheet, and a heater to heat the sheet that is bent by the curved surfaces of the plurality of curved surface members.