Composite Cylinder Vibration Damping for Flexographic Printing

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Solution Overview

Problem

Flexographic printing machines face challenges in quickly changing repeat lengths and achieving high printing speeds due to vibration issues in cylinders, which are not adequately addressed by existing technologies.

Innovation Solution

A cylinder with a specific layer structure comprising a base layer, compressible layers, and an outer layer, designed to accommodate compressed air channels for easy mounting and to reduce vibrations, featuring a base layer for stability, compressible layers for damping, and an outer layer for mechanical stability and smooth surface engagement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If sleeves are made lighter with thinner walls to enable easier changing over, then ease of operation is improved, but vibration damping and mechanical stability deteriorate

Engineering Contradiction:

Improveease of changing over sleevesVSAvoidvibration damping

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The sleeve is constructed as a composite structure with an inner GRP base sleeve layer providing structural stability and an outer polyurethane foam layer providing vibration damping. This composite material approach allows the sleeve to maintain mechanical stability and damping properties despite being lightweight and thin-walled, resolving the contradiction between ease of operation and reliability.

Inventive Principle:

Principle #40Composite materials

2Productivity

If printing speeds are increased to improve productivity, then productivity is improved, but vibration and resonance issues worsen

Engineering Contradiction:

Improveprinting speedVSAvoidvibration and resonance

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The polyurethane foam layer, which could be seen as an added complexity, actually converts the potential harm of vibrations into a benefit by providing damping. The foam material absorbs and dissipates vibrational energy, transforming the harmful resonance effects into reduced vibrations, thereby enabling higher printing speeds without compromising stability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Manufacturing precision

If the repeat length is changed by exchanging heavy steel cylinders, then manufacturing precision is maintained, but loss of time increases

Engineering Contradiction:

Improverepeat length accuracyVSAvoidtime for changing cylinders

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The cylinder system is segmented into a permanent steel printing forme cylinder and removable adapter sleeves with printing forms. This segmentation allows the heavy steel cylinder to remain in place, maintaining manufacturing precision, while only the lighter adapter sleeves and printing forms need to be exchanged for changing repeat lengths, significantly reducing the time required for format changes.

Inventive Principle:

Principle #1Segmentation

4Strength

If adapter sleeve wall thickness is increased to improve mechanical stability, then strength is improved, but ease of operation deteriorates

Engineering Contradiction:

Improvemechanical stabilityVSAvoidease of engagement

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The adapter sleeve incorporates an air conduction system with channels that deliver compressed air to expand the sleeve radially outward, forcing it onto the printing forme cylinder. This pneumatic mechanism enables easy engagement and removal of the sleeve without requiring excessive wall thickness, maintaining ease of operation while providing sufficient mechanical stability through the composite structure.

Inventive Principle:

Principle #29Pneumatics and hydraulics

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 proposed cylinder structure enhances vibration damping and allows for high printing speeds by minimizing resonances and facilitating easy engagement of printing sleeves, thereby improving the efficiency and format variability of flexographic printing machines.

Implementation Method 1

A cylinder with a specific layer structure comprising a base layer, compressible layers, and an outer layer, designed to accommodate compressed air channels for easy mounting and to reduce vibrations

Methodology Applied

Scientific EffectVibration damping: Damping

Implementation Method 2

compressible layers for damping

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 3

the printing forme cylinders may have air bores which emit a flow of compressed air. As a result of the compressed air, an air cushion is built up, thereby expanding the internal diameter of the adaptor sleeve

Methodology Applied

Scientific EffectAir cushion: Air Lubrication

Implementation Method 4

compressed air, an air cushion is built up, thereby expanding the internal diameter

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentUS11890857B2Low-vibration cylinder

Publication Date: 2024.02.06 XSYS GERMANY GMBH

AI summary

The invention relates to a cylinder (10) which is set up for application of at least one hollow cylinder, the cylinder (10) having a layer structure which comprises in this order, from inside to outside, a base layer (12) or a cylinder core, a first compressible layer (14), a filling layer (16), an interlayer (18), a second compressible layer (20) and an outer layer (22), the outer layer forming a lateral surface of the cylinder.The invention further relates to arrangements comprising at least one such cylinder (10) and further cylinders.