Hard Coat and Image Receiving Layer Structures for ID Documents

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Solution Overview

Problem

The integration of variable printing and optical memory features in identification documents poses challenges due to the need for different materials and manufacturing processes, often resulting in reduced manufacturing yield and degradation of printed information from wear and tear, particularly with the slow and tedious lamination process used for applying image receiving layers over protective hard coats.

Innovation Solution

A document structure comprising a polymer layer with an image receiving layer and a hard coat layer, where the hard coat layer is applied in stripes or interleaved with the image receiving layer to create a durable interface, allowing for variable printing while protecting optical windows, and eliminating the need for lamination by using a primer and UV or electron beam curing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If lamination process is used to apply image receiving layer over protective hard coat, then durability and protection are improved, but manufacturing complexity and production time increase

Engineering Contradiction:

ImprovedurabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the image receiving layer and protective hard coat into a single integrated layer during the coating process, eliminating the need for separate lamination of these components. This merging reduces manufacturing steps while maintaining the protective and imaging functions.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The primer layer is applied in advance to the substrate before applying the image receiving layer and hard coat. This preliminary action ensures proper adhesion and surface preparation, allowing subsequent layers to be applied directly without requiring lamination processes.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If lamination process is used to apply image receiving layer over protective hard coat, then protection is improved, but production time increases

Engineering Contradiction:

ImproveprotectionVSAvoidproduction time

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements a continuous coating process where the primer, image receiving layer, and hard coat are applied sequentially in one continuous manufacturing operation. This eliminates the stop-start nature of lamination processes, reducing production time while maintaining protective quality.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

By applying the primer layer in advance as part of the continuous coating process, the substrate is prepared for subsequent layers without requiring separate lamination steps, thereby reducing overall production time while ensuring proper adhesion and protection.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If separate layers are used for hard coat and image receiving layer, then functionality is improved, but manufacturing yield decreases

Engineering Contradiction:

ImprovefunctionalityVSAvoidmanufacturing yield

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent merges the image receiving layer and protective hard coat into a single integrated layer that performs both functions simultaneously. This reduces the number of separate manufacturing steps and potential failure points, improving manufacturing yield while maintaining the necessary imaging and protective functionalities.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated layer serves multiple functions: it acts as both the image receiving layer for variable data printing and the protective hard coat for durability. This multi-functionality reduces the number of separate components needed, simplifying manufacturing and improving yield.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This approach enhances durability and manufacturing yield by eliminating the lamination process, reducing costs, and maintaining compatibility with existing D2T2 printing systems, while ensuring the quality and field durability of ID documents.

Implementation Method 1

UV or electron beam curing

Methodology Applied

Scientific EffectUV curing: Photopolymerisation

Implementation Method 2

UV or electron beam curing

Methodology Applied

Scientific EffectElectron beam curing: Electron Beam

Implementation Method 3

D2T2 printing techniques... localized application of heat or pressure... dyes diffuse into the receiving layer

Methodology Applied

Scientific EffectThermal transfer: Diffusion

Data Source

PatentUS7829498B2Hard coat and image receiving layer structures for identification documents

Publication Date: 2010.11.09 IDEMIA CIVIL IDENTITY NA LLC

AI summary

The invention provides hard coat and image receiving layer structures and related methods used in ID document production. These structures and methods provide ID documents that offer hard protection in areas where needed (e.g., in optical windows for machine readable data), and also provide image receiving layers for later printing of variable data, such as personalization information of the bearer. Implementations of the structure provide an effective interface between hard coat and image receiving layers that provides enhanced durability in manufacture and field use.