Card Edge Coating to Prevent Color Bleed on Card Surfaces

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Solution Overview

Problem

Manufacturing card-type data carriers with individually colored edges poses logistical challenges, particularly when printing colors on the circumferential side face, as it risks spreading onto the top and bottom sides due to capillary forces, and requires upfront knowledge of financial institution and card quantity.

Innovation Solution

Apply a colored coating to the circumferential side face of the card, ensuring it is spaced apart from the top and bottom sides, using methods like inkjet printing and holding the card vertically with half shells or a precise holder arrangement to prevent color transfer during drying.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the circumferential side face is printed with color for individualization, then the card can be easily identified and individualized, but the print color may run onto the top side and bottom side due to capillary forces

Engineering Contradiction:

Improvecard individualizationVSAvoidcolor placement precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by positioning masking elements on the top and bottom sides of the card before applying the colored coating to the circumferential side face. This pre-positioning prevents the coating from running onto the top and bottom sides during the drying process, thereby maintaining manufacturing precision while enabling card individualization through coloring.

Inventive Principle:

Principle #10Preliminary action

2Area of stationary object

If the colored coating is applied over the entire side face area, then complete coverage is achieved, but the coating may run around the edge onto the top and bottom sides

Engineering Contradiction:

Improvecoating coverage areaVSAvoidcoating running

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent segments the side face coating area by introducing masking elements that create distinct zones: a coated circumferential side face area and uncoated top/bottom side areas. This segmentation prevents the coating from running onto the top and bottom sides while still providing complete coverage of the intended circumferential area, thereby eliminating the harmful effect of coating running.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The masking elements act as intermediary components between the colored coating and the top/bottom sides of the card. These intermediaries physically block the coating material from migrating onto the top and bottom sides through capillary forces, thereby preventing the harmful effect while maintaining complete coverage of the circumferential side face.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If cards are manufactured with pre-determined colors for specific financial institutions, then authenticity and identification are improved, but production flexibility is reduced and stockpiling is ruled out

Engineering Contradiction:

Improveauthenticity verificationVSAvoidproduction flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by enabling the colored coating step to be performed in a downstream production stage rather than being fixed during initial card manufacturing. This dynamic approach allows the card color to be determined later based on the specific financial institution and card quantity requirements, thereby maintaining authenticity verification while restoring production flexibility and enabling stockpiling of uncolored cards.

Inventive Principle:

Principle #15Dynamics

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

Minimizes the risk of color transfer onto the top and bottom sides, allowing for cost-effective individualization with precise control over the coating's placement and pattern, enabling varied designs.

Implementation Method 1

A spray method, in particular an inkjet printing method, may serve to generate the coating.

Methodology Applied

Scientific EffectSpray: Spray

Implementation Method 2

The card-type data carrier is preferably aligned vertically for the coating step. Any gravity-induced running of the applied coating before it has completely dried then takes place along the side faces at most, and not in the direction of the top side or bottom side of the card-type data carrier.

Methodology Applied

Scientific EffectGravity: Gravitation

Implementation Method 3

this reduces the risk of the coating running around the edge of the card and onto the top and/or bottom side of the card, for instance due to capillary forces

Methodology Applied

Scientific EffectCapillary forces: Capillary Action

Data Source

PatentUS20260099692A1Card-type data carrier and method for manufacture thereof

Publication Date: 2026.04.09 GIESECKE & DEVRIENT EPAYMENTS GMBH

AI summary

A method for manufacturing a card-type data carrier has a top side and a bottom side arranged parallel to one another, and a circumferential side face that connects the top side and bottom side to one another. The side face is provided with a coloured coating in such a way that the coloured coating is spaced apart from the top side and from the bottom side along the entire circumferential side face.