Counter-Rotating Brush Cleaner for Solvent-Free Paintbrush Washing

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Solution Overview

Problem

There is a need for efficient cleaning of used paintbrushes without using toxic solvents and preventing the release of microplastics into the environment.

Innovation Solution

A paintbrush cleaning device with a container holding a cleaning liquid and two twisted-in-wire brushes that rotate in contra-rotational sync, effectively removing paint from brushes using mechanical cleaning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional solvents are used to clean paintbrushes, then cleaning effectiveness is improved, but environmental harm and toxicity increase

Engineering Contradiction:

Improvecleaning effectivenessVSAvoidtoxicity and environmental harm

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces chemical cleaning mechanisms (solvents) with a mechanical cleaning system consisting of two counter-rotating twisted-in-wire brushes that physically scrub paint from the paintbrush through mechanical friction and abrasion

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the cleaning mechanism from chemical dissolution to mechanical removal, altering the fundamental parameter of how paint is removed from brushes - from solvent-based dissolution to friction-based physical removal

Inventive Principle:

Principle #35Parameter changes

2Productivity

If microplastics are released during cleaning, then paint removal is effective, but environmental pollution increases

Engineering Contradiction:

Improvepaint removal efficiencyVSAvoidmicroplastic pollution

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent captures the harmful microplastics removed from paintbrushes and redirects them to a collection container at the bottom, converting what would be environmental pollution into a contained waste stream that can be properly disposed of or recycled

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If cleaning liquid is used continuously, then cleaning capacity is maintained, but liquid consumption and waste increase

Engineering Contradiction:

Improvecleaning capacityVSAvoidcleaning liquid consumption

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent segments the cleaning system into distinct functional zones: an upper cleaning area where brushes are cleaned, and a lower collection area where dirty water and microplastics settle, allowing the cleaning liquid to be retained and reused multiple times

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements periodic action through the counter-rotating brushes that cyclically scrub and lift paint particles, allowing suspended particles to periodically settle to the bottom for collection, enabling continuous operation with minimal liquid replacement

Inventive Principle:

Principle #19Periodic action

4Productivity

If brushes rotate rapidly, then cleaning speed is improved, but brush wear increases

Engineering Contradiction:

Improvecleaning speedVSAvoidbrush service life

Core Design Contradiction:

ProductivityVSDuration of action of stationary object

Solution Approach 1:

The patent employs asymmetric twisted-in-wire brush designs where the wires are twisted in opposite directions on opposite sides, creating a balanced counter-rotational system that distributes wear evenly while maintaining high cleaning speed through optimized mechanical engagement

Inventive Principle:

Principle #4Asymmetry

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

The device efficiently cleans paintbrushes by sedimenting microplastics to the bottom, reducing cleaning liquid consumption and wear on the brushes, while maintaining cleanliness of the liquid for multiple uses.

Implementation Method 1

paint which may be dissolved in the cleaning liquid or, preferably, sediment to the bottom of the container

Methodology Applied

Scientific EffectDissolution: Solvation

Implementation Method 2

paint particles, typically containing environmentally harmful microplastics, sedimenting to the bottom

Methodology Applied

Scientific EffectSedimentation: Sedimentation

Implementation Method 3

the bristles of the twisted-in-wire brushes move through the bristles of the paintbrush during rotation of the twisted-in-wire brushes

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 4

By the bristles of the twisted-in-wire brushes moving through the bristles of the paintbrush during rotation of the twisted-in-wire brushes, paint is removed from the paintbrush

Methodology Applied

Scientific EffectAbrasion: Abrasion

Data Source

PatentUS20260109172A1Paintbrush cleaning device with two rotatable brushes

Publication Date: 2026.04.23 LAVABRUSH AB

AI summary

Provided is a paintbrush cleaning device having: a container arranged to hold a cleaning liquid; a first twisted-in-wire brush rotatably arranged in the container; a second twisted-in-wire brush rotatably arranged in the container; and a drivetrain arranged to rotate the brushes in contra-rotational sync. Each of the first and second brushes comprises: twisted stem wires defining a central longitudinal axis of rotation of the brush, and a plurality of bristles of equal length held by the twisted stem wires. The first and second brushes are arranged such that the axes of rotation are fixed in relation to the container and parallel to each other such that a paintbrush can be moved through an opening at a top of the container and in between the axes of rotation to be cleaned by the brushes when rotating.