Adhesive Flag Flutter Prevention in Foil Printing

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Solution Overview

Problem

In web-fed printing presses, adhesive tabs often protrude or hang down after a roll change, causing damage to the printing material and machine components, especially when processing high-strength substrates like plastic or metal foils, due to their mechanical resistance and the risk of web breaks or machine component damage.

Innovation Solution

Applying an adhesive-free liquid to the new roll and/or the side of the adhesive tab facing the web, ensuring the adhesive tab adheres over its entire length without causing production disruptions, even at high web speeds, by using water or hydrocarbon-based liquids that reduce surface tension and enhance wettability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If adhesive tape is applied to form an adhesive point to connect the old web and new web, then the webs are joined together, but the adhesive tab protrudes and causes damage to the web and machine components

Engineering Contradiction:

Improveadhesion strengthVSAvoidadhesive tab damage

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

A liquid application device is introduced as an intermediary between the adhesive tab and the web/machine components. This liquid acts as a mediator that prevents direct harmful contact while allowing the adhesive bonding function to remain effective, thereby eliminating web damage and machine component contamination without compromising adhesion strength.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful protruding adhesive tab is effectively removed or neutralized by applying liquid to its surface. The liquid coating transforms the adhesive tab from a harmful protruding element into a controlled, non-damaging component that can be safely managed during the web running process.

Inventive Principle:

Principle #2Taking out (Extraction)

2Length of moving object

If additional adhesive is applied beyond the adhesive point to reduce adhesive tab length, then the adhesive tab length is limited, but the adhesive sticks to machine components causing winders and contamination

Engineering Contradiction:

Improveadhesive tab lengthVSAvoidmachine component contamination

Core Design Contradiction:

Length of moving objectVSObject-generated harmful factors

Solution Approach 1:

Instead of using additional adhesive as a mediator, a liquid application device applies a different liquid substance that serves as the intermediary. This liquid prevents the adhesive tab from sticking to machine components while allowing the adhesive bonding to function normally, thereby reducing adhesive tab length without causing contamination or winders.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Rather than extending adhesive beyond the adhesive point to control length, the invention inverts the approach by applying liquid to the adhesive tab surface. This reverse strategy achieves length control and harm prevention through liquid coating rather than adhesive extension.

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If the web speed is increased to maintain production efficiency, then productivity increases, but the adhesive tab becomes more unstable and causes more damage

Engineering Contradiction:

Improveproduction speedVSAvoidadhesive tab stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The liquid application device introduces a liquid mediator that stabilizes the adhesive tab during high-speed web running. This liquid coating reduces the harmful effects of adhesive tab movement and instability that occur at increased speeds, allowing productivity enhancement without compromising reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The liquid application changes the physical parameters of the adhesive tab surface, creating a controlled state that maintains stability even at high web speeds. This parameter modification allows the system to operate reliably at higher productivity levels without the adhesive tab causing damage.

Inventive Principle:

Principle #35Parameter changes

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 adhesive tab is securely fixed over its entire length, preventing damage to the web and machine components, while maintaining production continuity without causing web tears or contamination, even with fluctuating adhesive tab lengths.

Implementation Method 1

using water or hydrocarbon-based liquids that reduce surface tension and enhance wettability

Methodology Applied

Scientific EffectSurface tension reduction: Surfactant

Implementation Method 2

enhance wettability

Methodology Applied

Scientific EffectWetting: Wetting

Data Source

PatentEP3553001B1Prevention of the flutter of the adhesive flag in foil printing

Publication Date: 2021.06.02 MANROLAND GOSS WEB SYST GMBH

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AI summary

Method and apparatus for performing a roll change to prevent the fluttering of adhesive tabs 12. The invention is based on the objective of providing a solution that enables the adhesive tab 12 to adhere along its entire length, particularly to a web 5 with high mechanical strength. This objective is achieved by applying an adhesive-free liquid to the new roll 8 and/or to the side of the adhesive tab 12 facing the web 5, at least over a portion of the adhesive tab 12, when using a fluid-repellent substrate. The invention can be used with roll changers 2 that process fluid-repellent substrates, such as plastic films, metal foils, or laminated materials, and where fluttering or lifting of the adhesive tab 12 is to be prevented.