Flexographic Plate Dot Formation via Scaffold Dots

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Solution Overview

Problem

Flexographic printing faces challenges in forming reliable small dots on flexographic plates due to insufficient exposure, leading to dot deformation and scum dot formation, especially at the edges of halftone arrays, which affects print quality and tone reproduction.

Innovation Solution

The method involves exposing the back of the flexographic plate to form a floor, providing a screened image with isolated dots and scaffold dots that do not extend to the floor, and using a solvent to wash away unexposed material and scaffold dots, thereby controlling the plate relief and ensuring proper dot formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the minimum dot size is increased to ensure proper dot formation, then dot stability is improved, but the ability to print light grey tones deteriorates

Engineering Contradiction:

Improvedot stabilityVSAvoidlight grey tone reproduction

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The image layer is segmented into two functional components: printing dots that form the actual image and scaffold dots that provide structural support. This segmentation allows small printing dots for light tones while having larger scaffold dots nearby to ensure proper floor formation and dot stability, resolving the contradiction between dot stability and light tone reproduction capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Scaffold dots act as intermediary structures that do not print themselves but facilitate proper formation of the plate floor and support adjacent printing dots. These intermediary elements enable small printing dots to maintain stability without requiring increased dot size, thus preserving light grey tone reproduction while ensuring dot reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the plate relief is reduced to improve dot stability, then dot deformation is reduced, but dirt accumulation in the floor increases

Engineering Contradiction:

Improvedot stabilityVSAvoiddirt accumulation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The plate structure is given local quality variations through the strategic placement of scaffold dots. Areas with scaffold dots have enhanced floor formation and support structures, while other areas maintain lower relief. This localized enhancement provides dot stability where needed without increasing overall dirt accumulation, resolving the contradiction between dot stability and dirt accumulation

Inventive Principle:

Principle #3Local quality

3Productivity

If isolated dots are made smaller for better tone reproduction, then light grey tones are improved, but insufficient exposure and dot deformation occur

Engineering Contradiction:

Improvelight grey tone reproductionVSAvoiddot formation quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

Scaffold dots are placed in advance around isolated printing dots to preliminarily establish the plate floor structure and provide support framework. This preliminary action ensures that when small printing dots are exposed, they have adequate structural support from the pre-formed scaffold dots, preventing deformation while maintaining small size for light tone reproduction

Inventive Principle:

Principle #10Preliminary action

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 the stability and formation of small dots, reducing the risk of deformation and scum dot formation, while maintaining print quality and allowing for better reproduction of light tones by carefully managing the plate relief and exposure.

Implementation Method 1

Exposing the back of the plate to UV light... The back exposure is used to establish the floor of the plate... sufficient cross linking occurs all the way down to the plate floor

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Implementation Method 2

Exposing the plate though the film using UV light... For every opening in the image layer, a cone of UV light with an angle of about 40 degrees from the normal propagates through the plate forming cone shaped relief dots

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Implementation Method 3

Applying additional exposure to harden the plate... Using a solvent to wash away the unexposed plate material

Methodology Applied

Scientific EffectDissolution: Solvation

Data Source

PatentUS9067402B1Forming an image on a flexographic media

Publication Date: 2015.06.30 MIRACLON CORP

AI summary

A method for forming an image on a flexographic plate includes exposing a back of the flexographic plate to form a floor; providing a screened image; locating isolated dots on the screened image; exposing a front of the flexographic plate to form the image, isolated dots and scaffold dots adjacent to the isolated dots; wherein the scaffold dots do not extend to the floor; and applying a solvent to wash away the unexposed material and the scaffold dots from the flexographic plate.