Superheated Steam Intermediate Fixing for Duplex Print Image Stability

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Solution Overview

Problem

In two-sided printing, the challenge lies in fixing the print image on the front side without damaging it, while simultaneously printing on the back side, as existing methods often result in image distortion, soiling of rollers, and energy inefficiencies, particularly with thermal fixing which causes shrinkage and requires large equipment.

Innovation Solution

A printing arrangement that includes a simplex printing apparatus for the front side, a duplex printing apparatus for the back side, and an intermediate fixing apparatus using superheated steam to pre-fix the print image on the front side, reducing retransfer issues and maintaining the recording medium's integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If thermal fixing is used to fix the print image on the front side, then the print image can be fixed, but the recording medium shrinks and causes distortion in print image dimensions

Engineering Contradiction:

Improveprint image fixingVSAvoidprint image dimension accuracy

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent changes the fixing parameter from thermal energy (heat) to moisture energy (steam). By using steam instead of hot air or direct heat, the recording medium is fixed without undergoing thermal shrinkage, thereby maintaining print image dimension accuracy while achieving reliable fixing.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes the phase transition of water from liquid to vapor (steam) to achieve fixing. The steam penetrates the recording medium and fixes the print image through moisture absorption and phase change, avoiding the thermal shrinkage associated with conventional thermal fixing methods.

Inventive Principle:

Principle #36Phase transitions

2Reliability

If conventional thermal fixing stations are used, then fixing can be achieved, but the equipment becomes relatively large and energy consumption increases

Engineering Contradiction:

Improveprint image fixingVSAvoidfixing station size

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs a steam-based fixing system that utilizes pneumatic principles to deliver fixed-phase steam directly to the recording medium. This approach replaces bulky thermal fixing stations with a more compact steam injection system, reducing equipment size while maintaining fixing reliability.

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

By using steam (fixed-phase water vapor) instead of heating air or direct thermal radiation, the system achieves efficient fixing with lower energy input and smaller equipment footprint. The phase transition of steam provides intense fixing action without requiring large thermal mass or prolonged exposure times.

Inventive Principle:

Principle #36Phase transitions

3Productivity

If the unfixed print image is fed directly to the duplex printing unit, then productivity is maintained, but the print image is damaged and the pressure roller is soiled

Engineering Contradiction:

Improveprinting speedVSAvoidprint image damage

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary fixing action using steam immediately after the simplex printing unit and before the duplex printing unit. This preliminary steam fixing stabilizes the print image on the front side, preventing it from being damaged or transferred to the pressure roller during subsequent handling, while maintaining continuous productivity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces steam as an intermediary substance between the simplex printing unit and the duplex printing unit. The steam acts as a mediating agent that fixes the print image without requiring mechanical contact or additional fixing rollers, thereby preventing damage to the print image and avoiding soiling of the pressure roller while maintaining workflow continuity.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 method enables rapid and energy-efficient intermediate fixing of the print image using superheated steam, minimizing distortion and energy consumption, while maintaining the recording medium's stability and preventing shrinkage, thus achieving high-quality, congruent prints on both sides without significant equipment complexity.

Implementation Method 1

an intermediate fixing apparatus which is arranged between the simplex printing apparatus and the duplex printing apparatus and which is designed to intermediately fix the first side of the recording medium, printed on by the simplex printing apparatus, by superheated steam

Methodology Applied

Scientific EffectSuperheated steam: Superheating

Data Source

PatentUS9261838B2Printing arrangement for two-sided printing on a recording medium and printing method

Publication Date: 2016.02.16 OCE PRINTING SYST GMBH

AI summary

A printing arrangement and printing method are disclosed for two-sided printing on a recording medium, in which intermediate fixing by superheated steam takes place after printing on the first side of the recording medium. Owing to the intermediate fixing, damage to the print image of the first side during subsequent printing on the second side is avoided without the recording medium being impaired by the intermediate fixing.