Rounded Image Canvas Corners for Plastic Card Flash Reduction

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Solution Overview

Problem

Conventional retransfer printing processes on plastic cards result in excess material (flash) at the card edges due to right-angle corners, leading to inefficiencies and potential misalignment during image transfer.

Innovation Solution

Implementing an image canvas with rounded corners instead of traditional right-angle corners to reduce the amount of printing at the corners, thereby minimizing flash and improving alignment accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If right-angle corners are used in the image canvas, then the printing area is maximized, but flash occurs at the card edges

Engineering Contradiction:

Improveprinting areaVSAvoidflash

Core Design Contradiction:

Area of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The patent applies curvature by replacing the right-angle corners of the image canvas with rounded corners. This modification eliminates the sharp edges that cause excess printing material (flash) to accumulate at the card edges, while preserving the overall printing area. The rounded corners smoothly transition the printing boundary, preventing material buildup and improving alignment during the lamination process.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Manufacturing precision

If right-angle corners are used in the image canvas, then alignment tolerance is provided through margin, but misalignment and flash occur during transfer

Engineering Contradiction:

Improvealignment toleranceVSAvoidtransfer accuracy

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The rounded corners modify the geometry of the image canvas to eliminate sharp edges that exacerbate misalignment issues during transfer. By curving the corners, the patent creates a more forgiving transition zone that reduces the visibility and impact of slight alignment variations, thereby improving transfer accuracy and reducing flash without sacrificing alignment tolerance.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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

Reduces flash and enhances printing precision by utilizing rounded corners, ensuring smoother image transfer and better alignment on plastic cards.

Implementation Method 1

printing an image on the card surface... retransfer printing is a known printing process where an image is printed by a printing mechanism onto an intermediate retransfer material

Methodology Applied

Scientific EffectThermal transfer:

Implementation Method 2

the intermediate retransfer material is transferred by lamination onto the surface of the plastic card

Methodology Applied

Scientific EffectLamination: Lamination

Data Source

PatentEP3642040B1Rounded image canvas corners

Publication Date: 2025.10.22 ENTRUST CORP

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AI summary

A printing process that reduces the amount of flash that occurs when printing to a surface of a plastic card. The printing can occur by a retransfer printing process. The printing process includes generating an image canvas that has rounded corners instead of the conventional right angle corners. The use of rounded corners on the image canvas reduces the amount of printing in the image canvas at the corners compared to an image canvas that has right angle corners, thereby reducing the amount of printing that is present that could form flash at the corners of the card surface.