Offset Printing Cloth Rubber Layer Grinding
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Solution Overview
Problem
The production of offset printing blankets faces issues with defects in the rubber layers due to sandpaper damage, leading to thickness tolerance deviations and surface roughness problems, resulting in scrap materials.
Innovation Solution
The method involves sanding the rubber layer with abrasive fleece, which provides increased contact pressure to remove material at defect areas while minimizing material removal in other areas, using a compressible abrasive fleece that can be endless or three-dimensional, and focusing on edge hardening for precise defect correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sandpaper is used to grind the rubber layer surface, then the surface structure is defined, but defects occur due to sandpaper damage causing elevations and thickness tolerance deviations
Solution Approach 1:
The grinding process is divided into two distinct stages: first using sandpaper to establish the basic surface structure, then using abrasive fleece to selectively remove defects. This segmentation allows each abrasive type to perform its specific function optimally without the drawbacks of using a single abrasive throughout.
Solution Approach 2:
The abrasive fleece is designed to provide different contact pressures in different areas - high contact pressure at defect locations (elevations) and low contact pressure in remaining areas. This local differentiation enables selective material removal only where defects exist, preserving the thickness tolerance of the rubber layer.
2Loss of substance
If abrasive fleece is used to remove defect areas, then material removal is minimized in remaining areas, but the process complexity increases
Solution Approach 1:
The key parameter change is the compressibility of the abrasive fleece compared to rigid sandpaper. This parameter change enables the fleece to conform to the rubber layer surface and provide variable contact pressure, achieving selective material removal at defects while minimizing removal in remaining areas.
3Stability of the object's composition
If continuous grinding is applied to the entire surface, then uniform treatment is achieved, but material removal increases in defect-free areas
Solution Approach 1:
The abrasive fleece creates local quality differences through its compressible nature, providing high contact pressure (and thus material removal) only at defect locations where the fleece is compressed, while maintaining low contact pressure in defect-free areas, thereby avoiding excessive material removal.
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 effectively eliminates defects and maintains thickness tolerance, significantly reducing waste by only removing material where necessary, ensuring precise surface quality for printing blankets.
Implementation Method 1
the surface of the rubber layer facing away from the reinforcement layer is then sanded at least in areas with abrasive fleece
Data Source
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AI summary
The invention relates to a method for producing a multilayer printing cloth (2), in particular a method for producing an offset printing cloth comprising at least one reinforcing carrier layer (4) and at least one rubber layer (6), wherein at least one of the rubber layers of the printing cloth is treated as follows: the surface of the rubber layer (6) facing away from the reinforcing carrier layer (4) is first ground using grinding paper (22), the surface of the rubber layer (6) facing away from the reinforcing carrier layer (4) is then ground using a non-woven grinding pad (40) at least in areas.