Polishing Liquid Delivery Arm Self-Cleaning to Prevent Residue Buildup

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Solution Overview

Problem

The buildup of dried polishing liquid on the polishing liquid delivery arm during chemical mechanical polishing leads to abrasive particle agglomeration, causing scratches and defects on the polishing surface, and requires significant non-productive cleaning time and effort.

Innovation Solution

A removable polishing liquid delivery arm cleaning tool that directs cleaning fluid back onto the inner surfaces of the delivery arm, effectively preventing the buildup of dried polishing liquid by redirecting cleaning fluid to flush out accumulated residues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual cleaning methods are used to remove polishing liquid buildup, then cleaning effectiveness is improved, but maintenance time and operational downtime increase

Engineering Contradiction:

Improvecleaning effectivenessVSAvoidmaintenance time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system uses the polishing liquid delivery arm's own cleaning fluid delivery capability to clean itself. The cleaning fluid is delivered through the existing ports and enclosure, allowing the arm to perform self-cleaning without external intervention, thus reducing maintenance time while maintaining cleaning effectiveness

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The cleaning fluid is delivered continuously or periodically during polishing operations to prevent buildup before it becomes problematic. This preliminary cleaning action eliminates the need for extensive post-operational manual cleaning, reducing both maintenance time and ensuring consistent cleaning effectiveness

Inventive Principle:

Principle #10Preliminary action

2Productivity

If polishing liquid delivery arm is not cleaned regularly, then productivity is maintained, but abrasive particle agglomeration causes scratches and defects on polishing surface

Engineering Contradiction:

Improveoperational continuityVSAvoidpolishing surface quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The cleaning fluid delivery operates continuously or periodically during polishing operations, maintaining continuous cleaning action that prevents abrasive particle agglomeration. This ensures polishing surface quality is maintained without interrupting productivity, as the cleaning occurs concurrently with polishing operations

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The system monitors cleaning fluid delivery and adjusts to maintain optimal cleaning effectiveness. The cleaning process provides feedback on the condition of the delivery arm, allowing adjustments to prevent buildup that would compromise polishing surface quality while maintaining operational continuity

Inventive Principle:

Principle #23Feedback

3Device complexity

If traditional cleaning approaches are used, then simplicity is maintained, but difficult to access locations on the delivery arm cannot be cleaned effectively

Engineering Contradiction:

Improvecleaning system simplicityVSAvoidcleaning completeness

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The cleaning fluid delivery system uses the existing multi-functional ports and enclosure of the polishing liquid delivery arm. The same structure that delivers polishing liquid is adapted to deliver cleaning fluid, eliminating the need for separate cleaning apparatus and achieving comprehensive cleaning of all surfaces including difficult-to-access locations

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Instead of bringing external cleaning tools to the delivery arm, the system inverts the approach by using the delivery arm's own fluid delivery capability to spray cleaning fluid upward onto its own surfaces. This reverse cleaning approach effectively reaches all surfaces including those that would be difficult to access with external tools

Inventive Principle:

Principle #13The other way round (Inversion)

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 scratches and defects on the polishing surface, decreases maintenance downtime, and improves productivity by simplifying and speeding up the cleaning process.

Implementation Method 1

the cleaning tool directs the cleaning fluid from the polishing liquid delivery arm on to a surface of the enclosure of the polishing liquid delivery arm

Methodology Applied

Scientific EffectFluid flow redirection:

Data Source

PatentUS20260042187A1Cleaning system for polishing liquid delivery arm

Publication Date: 2026.02.12 APPLIED MATERIALS INC

AI summary

A polishing liquid delivery arm cleaning tool includes a body configured to be removably secured to a polishing liquid delivery arm of a chemical mechanical polishing system, and an insert removably secured to the body. The insert has an arm-facing surface shaped to direct a cleaning fluid from the polishing liquid delivery arm back to an inner surface of an enclosure of the polishing liquid delivery arm.