Anilox Printing Unit Ink Accumulation Control

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Solution Overview

Problem

Existing anilox printing units face issues with ink accumulation on the outer side of the feed blade, leading to uncontrolled detachment and undesired ink density fluctuations, particularly with high-viscosity inks, as previous solutions either require complex additional smoothening devices or are ineffective with high-viscosity inks.

Innovation Solution

A method involving a screen roller and feed blade where the accumulated ink is removed by rotating the screen roller relative to the feed blade during maintenance, smoothening and spreading the ink onto the screen roller, and then scraping it off to return it to the ink fountain, eliminating the need for additional smoothening devices and allowing use with high-viscosity inks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a collecting container is provided underneath a chambered doctor blade to collect dripping ink, then ink accumulation is collected, but the system only works reliably for inks with comparatively low viscosity and high-viscosity inks tend to stick to the lower side of the blade without running off

Engineering Contradiction:

Improveink collection reliabilityVSAvoidcompatibility with high-viscosity inks

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

Instead of using gravity to let ink run down into a collecting container, the invention reverses the approach by using the feed blade to actively scrape and remove accumulated ink from the screen roller's lower side, making the system effective for both low and high-viscosity inks

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If a smoothening device is added to flatten accumulated ink on the screen roller, then ink density fluctuations are prevented, but the system construction becomes comparatively complex

Engineering Contradiction:

Improveink density consistencyVSAvoidsystem construction complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The feed blade, which already exists in the anilox printing unit for its primary function of delivering ink, is made to perform an additional function of scraping and removing accumulated ink from the screen roller, thereby eliminating the need for a separate smoothening device and reducing system complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Quantity of substance

If ink accumulates on the lower side of the feed blade, then ink beard forms, but the accumulated ink may detach in an uncontrolled way and cause undesired ink density fluctuations on the printing stock

Engineering Contradiction:

Improveink accumulationVSAvoidink density consistency

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The accumulated ink that would normally detach uncontrollably and cause defects is instead systematically removed by the feed blade in a controlled manner, converting a harmful phenomenon into a manageable process that prevents printing defects

Inventive Principle:

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

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

Effectively prevents ink accumulation issues by smoothening and reusing high-viscosity ink, reducing waste and maintaining consistent ink density without the need for complex additional equipment.

Implementation Method 1

the accumulated ink is conveyed out of a circumferential screen roller region located underneath the feed blade and past the feed blade into a circumferential screen roller region located above the feed blade

Methodology Applied

Scientific EffectGravity: Gravitation

Implementation Method 2

causing the accumulated ink to be smoothened and spread onto the screen roller by the feed blade

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 3

the accumulated ink is scraped off the screen roller by the feed blade

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS8783175B2Method for operating an anilox printing unit and printing press with an anilox printing unit

Publication Date: 2014.07.22 HEIDELBERGER DRUCKMASCHINEN AG

AI summary

A printing press includes an anilox printing unit having a screen roller and a feed blade as components, in which ink accumulates on an outer side of the feed blade during printing. A method for operating the anilox printing unit includes removing the accumulated ink from the feed blade by moving one of the two components relative to the other of the two components in a first direction in a first step, causing the accumulated ink to be flattened by the feed blade and to be spread onto the screen roller. The component that was moved in the first direction in the first step may be moved in an opposite, second direction in a second step, causing the accumulated ink to be scraped off the screen roller by the feed blade.