Hollow Synthetic Bristle Chemical Tipping for Paint Brushes

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Solution Overview

Problem

Hollow synthetic bristles cannot be satisfactorily tapered using existing chemical tipping methods due to capillary action, and mechanical tapering damages them, limiting their ability to mimic natural fibers in paint brushes for efficient paint pickup and surface finish.

Innovation Solution

A method involving chemical tipping of hollow synthetic bristles, where a portion of the bristle is immersed in a chemically tipping fluid, such as sodium hydroxide, to reduce wall thickness and create multiple split ends, enhancing paint pickup and release while maintaining bristle integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If chemical tipping fluid is applied to hollow synthetic bristles, then paint pickup is improved, but the chemical fluid penetrates uncontrollably into the hollow interior due to capillary action

Engineering Contradiction:

Improvetapering precisionVSAvoidprocess controllability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The hollow interior cavity is filled with an inert substance (such as wax or salt) before chemical tipping. This extracted the problematic capillary action from the system by removing the hollow space that caused uncontrolled fluid penetration, allowing the chemical tipping fluid to act only on the outer surface of the bristle.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The hollow interior is pre-filled with an inert substance before the chemical tipping process. This preliminary action prevents the chemical fluid from penetrating into the hollow interior by blocking the capillary pathways in advance, thereby preventing the harmful effect before it can occur.

Inventive Principle:

Principle #9Preliminary anti-action

2Manufacturing precision

If mechanical tapering is used on hollow synthetic bristles, then paint pickup is improved, but the bristles are damaged due to their hollow structure

Engineering Contradiction:

Improvetapering qualityVSAvoidbristle integrity

Core Design Contradiction:

Manufacturing precisionVSStrength

Solution Approach 1:

The mechanical tapering process is replaced with a chemical tipping process. Instead of using mechanical abrasion that damages the hollow bristle structure, a chemical solution is used to gradually dissolve and taper the bristle surface, which is gentler and preserves the structural integrity of the hollow bristles while achieving the desired tapering effect.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If hollow synthetic bristles are used, then paint pickup is enhanced, but the ability to create fine surface finish is reduced compared to natural fibers

Engineering Contradiction:

Improvepaint pickup efficiencyVSAvoidsurface finish quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The bristle is given different properties at different locations: the hollow interior structure is maintained for paint pickup, while the outer surface is chemically tipped to create a tapered, split-end structure that mimics natural fibers for fine surface finish. This local differentiation allows the bristle to excel at both paint pickup and surface finish creation.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The bristle combines two structural features: the hollow interior (for paint pickup) and the chemically tipped outer surface with split ends (for fine surface finish). This composite structure integrates the advantages of both hollow bristles and natural fibers into a single synthetic bristle design.

Inventive Principle:

Principle #40Composite materials

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 method achieves improved paint pickup and release, along with a finer surface finish, by creating a tapered and flagged bristle with optimized stiffness and split ends, effectively simulating natural fibers without damaging the bristles.

Implementation Method 1

immersing a part of a second end of the hollow synthetic bristle in a chemically tipping fluid, such as sodium hydroxide, to reduce wall thickness

Methodology Applied

Scientific EffectChemical dissolution:

Implementation Method 2

creating a tapered and flagged bristle with optimized stiffness and split ends, effectively simulating natural fibers

Methodology Applied

Scientific EffectChemical degradation:

Data Source

PatentEP3579724B1Method of producing a hollow synthetic bristle, a hollow synthetic bristle and a paint brush comprising such hollow synthetic bristles

Publication Date: 2024.01.24 ORKLA HOUSE CARE

Figure 1a~3

AI summary

The present invention relates to a method of producing a hollow synthetic bristle, a hollow synthetic bristle and a paint brush comprising a plurality of such hollow synthetic bristles. The method comprises the following steps: 1) arranging at least a first end of the hollow synthetic bristle (1) in a holder; 2) immersing a part (2) of a second end of the hollow synthetic bristle (1) in a chemically tipping fluid; 3) lifting up the hollow synthetic bristle (1) from the chemically tipping fluid after a period of time, wherein the part (2) of the hollow synthetic bristle (1) that is immersed in the chemically tipping fluid is 1 -30% of the length of the hollow synthetic bristle (1).