Bridge Sleeve Diametrically Expandable Stabilizers
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Solution Overview
Problem
Conventional air-mounted bridge sleeves in flexographic, offset, and rotogravure printing fail to maintain a fixed radial distance between the rotary mandrel and the print sleeve at high speeds, leading to unsatisfactory print quality due to vibrations and uneven pressure, causing banding and resolution issues.
Innovation Solution
The introduction of a bridge sleeve with rigid stabilizers at each end that diametrically expand using compressed air for mounting, eliminating the need for an elastically compressible layer, ensuring a concentric and rigid attachment between the mandrel and the print sleeve, even at high line speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an elastically compressible and radially deformable layer is used in conventional bridge sleeves to enable air mounting, then the bridge sleeve can be easily mounted and dismounted using compressed air, but the bridge sleeve becomes non-rigid and deforms under vibration and rotational inertia at high speeds, causing it to become out of round and compromising print quality
Solution Approach 1:
The bridge sleeve is segmented into three distinct layers: a rigid outer layer (carbon fiber reinforced plastic) that maintains structural integrity and concentricity, an intermediate layer that provides controlled expansion, and an inner layer that interfaces with the mandrel. This segmentation allows the outer rigid layer to prevent deformation while the inner layers enable air-actuated expansion for easy mounting and dismounting.
Solution Approach 2:
The bridge sleeve employs a composite multi-layer construction combining rigid carbon fiber reinforced plastic for the outer layer with more compliant inner layers. This composite structure provides both the rigidity needed to maintain concentricity at high speeds and the compliance needed for air-actuated expansion during mounting and dismounting operations.
2Manufacturing precision
If the bridge sleeve is made rigid to maintain fixed radial distance and prevent vibration at high speeds, then print quality is maintained, but the bridge sleeve cannot be easily mounted and dismounted using simple air mounting methods
Solution Approach 1:
The bridge sleeve transitions from a static rigid structure to a dynamic structure that can change its mounting state. The inner layers are designed to expand radially when compressed air is applied, transforming the sleeve from a non-mountable rigid structure to a mountable structure that can be easily attached and removed using air pressure without compromising the outer rigid layer's ability to maintain precision.
3Ease of operation
If compressed air is used to expand the inner surface of the bridge sleeve for mounting, then mounting and dismounting becomes simple and quick, but the elastically compressible layer degrades over time under repeated expansion and contraction, reducing reliability
Solution Approach 1:
The bridge sleeve is segmented into three distinct layers: a rigid outer layer (carbon fiber reinforced plastic) that maintains structural integrity and concentricity, an intermediate layer that provides controlled expansion, and an inner layer that interfaces with the mandrel. This segmentation allows the outer rigid layer to prevent deformation while the inner layers enable air-actuated expansion for easy mounting and dismounting.
Solution Approach 2:
The bridge sleeve employs a composite multi-layer construction combining rigid carbon fiber reinforced plastic for the outer layer with more compliant inner layers. This composite structure provides both the rigidity needed to maintain concentricity at high speeds and the compliance needed for air-actuated expansion during mounting and dismounting operations.
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 solution maintains a constant radial distance, preventing vibrations and ensuring stable print quality at speeds up to 1,200 meters per minute, reducing the likelihood of banding and improving image resolution.
Implementation Method 1
diametrically expand using compressed air for mounting
Implementation Method 2
The difference between these diameters enables an interference fit to be achieved between the mandrel of the printing machine and the conventional bridge sleeve
Implementation Method 3
compressed air expands the diameter of the inner surface of the conventional bridge sleeve sufficiently to allow the bridge sleeve to slide over a cushion of air, a so-called air bearing, onto the outer surface of the mandrel
Data Source
Figure 1
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AI summary
A bridge sleeve has at each extreme end of the bridge sleeve, a multi-component stabilizer. One component of each stabilizer includes an inner cylindrical contacting surface having a diameter that changes as this respective component of the stabilizer moves axially relative to at least one other component of the respective stabilizer.