Planar Workpiece Wet Processing With Pressure-Driven Plane Stabilization

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Solution Overview

Problem

Existing wet processing technologies struggle to maintain relatively thin and flexible workpieces in a single plane during processing, leading to undulations and potential damage or uneven coatings due to the lack of effective barriers against liquid flow perpendicular to the processing direction.

Innovation Solution

The device incorporates channels through the walls to conduct liquid to apertures on opposite sides of the central plane, creating a flow field that keeps the workpiece in the central plane by accelerating liquid flow towards discharge openings, with barriers preventing backflow and minimizing contact with electrodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If wheels are used to convey the workpiece, then the workpiece can be transported through the treatment chamber, but the wheels contact the workpiece at locations along the entire width, causing damage or uneven coating on vulnerable workpieces

Engineering Contradiction:

Improveworkpiece conveyanceVSAvoidworkpiece damage and uneven coating

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical wheel conveyance system with a liquid flow-based transport mechanism. Pressurized liquid flows through channels in the walls and apertures in the workpiece, creating a pressure-driven system that eliminates mechanical contact between wheels and workpiece surface, thereby preventing damage and uneven coating while maintaining conveyance functionality

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention uses pressurized liquid flow through channels and apertures to convey the workpiece. The liquid pressure system replaces mechanical wheel contact, using fluid dynamics to move the workpiece through the treatment chamber without physical contact that could damage vulnerable surfaces or cause uneven coating

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Object-affected harmful factors

If the distance between anodes and workpiece is increased to prevent contact, then workpiece damage is reduced, but undulations in the workpiece cause uneven coating due to distance variations

Engineering Contradiction:

Improveworkpiece damageVSAvoidcoating uniformity

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The patent uses pressurized liquid flow to maintain the workpiece in a stable central plane position during transport. The liquid pressure system counteracts gravitational and vibrational forces that cause undulations, ensuring the workpiece remains at a consistent distance from the anodes throughout the treatment process, thereby achieving both damage prevention and coating uniformity

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Reliability

If squeeze rollers are used to seal the treatment chamber, then liquid containment is improved, but tight contact across the foil width is required which may damage vulnerable workpieces

Engineering Contradiction:

Improveliquid containmentVSAvoidworkpiece damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces mechanical squeeze rollers with a liquid pressure containment system. Pressurized liquid flows through channels in the walls and exits through apertures in the workpiece, creating a sealed environment through pressure differential rather than mechanical compression. This eliminates the need for tight mechanical contact while maintaining effective liquid containment

Inventive Principle:

Principle #29Pneumatics and hydraulics

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 design effectively maintains thin workpieces in a single plane, preventing undulations and ensuring uniform processing without physical contact, resulting in a compact and efficient wet processing apparatus.

Implementation Method 1

channels through the walls, each channel arranged to conduct liquid to a respective one of the apertures

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

creating a flow field that keeps the workpiece in the central plane by accelerating liquid flow towards discharge openings

Methodology Applied

Scientific EffectFluid flow acceleration:

Data Source

PatentUS12371811B2Apparatus for wet processing of a planar workpiece, device for a cell of the apparatus and method of operating the apparatus

Publication Date: 2025.07.29 ATOTECH DEUT GMBH & CO KG

AI summary

A device for a cell of an apparatus for wet processing of a planar workpiece, comprises a structure comprising first and second walls. The workpiece is movable in a central plane through a space between the first and second walls in a first direction (y). Apertures for introducing pressurised liquid between the first and second walls are on opposite sides of the central plane and facing the central plane. The apertures are distributed in the first direction (y) and in a second direction (x) transverse to the first direction (y). Discharge openings for the liquid to leave the space are on opposite sides, in the second direction (x), along the space in the first direction (y). The first and second walls form barriers to liquid flow from the space in a direction (z) perpendicular to the central plane. Channels through the walls are arranged to conduct liquid to respective one of the apertures.