Acetone Vapor Smoothing of 3D-Printed Polymer Surfaces

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

3D-printed polymer surfaces of motor vehicle components exhibit excessive roughness, which existing methods such as solvent treatment, sandblasting, and grinding fail to adequately smooth without risking explosions or losing small details, and are often costly and dependent on manual skill.

Innovation Solution

A method involving a vacuum-tight chamber where acetone is vaporized at a partial vacuum of up to 50 kPa, allowing the vapor to act on the surface for smoothing without thermal energy input, ensuring safety and precision.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If sandblasting or grinding is used to smooth the surface, then surface roughness is reduced, but small details are lost and treatment quality depends on manual skill

Engineering Contradiction:

Improvesurface roughnessVSAvoiddetail preservation

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent replaces mechanical surface treatment methods (sandblasting, grinding) with a chemical vapor deposition process using acetone vapor. The vapor condenses on the polymer surface and dissolves the rough layers chemically, eliminating mechanical contact that would remove material and lose small details, while achieving uniform smoothing across complex geometries.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If acetone vapor treatment is performed at atmospheric pressure, then surface smoothing is achieved, but explosion risk increases

Engineering Contradiction:

Improvesurface smoothnessVSAvoidexplosion risk

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent performs acetone vapor treatment in a vacuum environment (reduced pressure) rather than at atmospheric pressure. This creates an inert-like atmosphere where acetone vapor cannot form explosive mixtures with air, eliminating the explosion hazard while maintaining effective surface smoothing through vapor condensation and polymer dissolution.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

3Productivity

If thermal energy is applied to vaporize acetone, then vaporization efficiency increases, but safety risks and energy consumption increase

Engineering Contradiction:

Improvevaporization rateVSAvoidsafety risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent utilizes the phase transition of acetone from liquid to vapor through pressure reduction (vacuum) rather than thermal heating. By lowering the ambient pressure, acetone vaporizes at room temperature, achieving efficient vapor generation without the safety risks and energy consumption associated with thermal heating methods.

Inventive Principle:

Principle #36Phase transitions

4Adaptability or versatility

If manual treatment methods are used, then flexibility is maintained, but treatment cost and time increase

Engineering Contradiction:

Improvetreatment flexibilityVSAvoidtreatment speed

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent employs an automated vacuum vapor deposition system where acetone vapor automatically condenses and smooths the polymer surface through capillary action and concentration gradients. The process requires no manual intervention during treatment, eliminating skill-dependent variability while achieving rapid, uniform results across complex geometries, thereby improving both productivity and consistency.

Inventive Principle:

Principle #25Self-service

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 safely smooths the polymer surface without thermal energy, achieving a high-quality finish similar to injection molding, while maintaining the accuracy and safety of the treated article.

Implementation Method 1

admitting acetone into the chamber, which leads to a vaporization of at least some of the acetone; the vapor is precipitated on the surface of the article

Methodology Applied

Scientific EffectVaporization: Evaporation

Implementation Method 2

the vapor is precipitated on the surface of the article

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 3

acetone dissolves or at least partially dissolves a large number of plastics, for example ABS

Methodology Applied

Scientific EffectSolvation: Solvation

Data Source

PatentUS10427364B2Smoothing of a surface of an article formed from a plastic

Publication Date: 2019.10.01 FORD GLOBAL TECH LLC

AI summary

A device and method for smoothing a surface of an article formed at least partially from plastic, in particular a component of a motor vehicle, is provided. The method includes arranging the article in a vacuum-tight chamber, reducing the pressure in the chamber to a partial vacuum of not more than 50 kPa, in particular not more than 34 kPa, and admitting acetone into the chamber. Some of the acetone is vaporized and the vapor is precipitated on the surface of the article. In one form, the precipitated vapor acts on the article for at least 1 minute. The method further includes opening the chamber, so that at least the ambient pressure prevails in the chamber and removing the article from the chamber.