3D Polymer Surface Treatment Using Hot-Cold Immersion Smoothing
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Solution Overview
Problem
Existing additive manufacturing methods produce three-dimensional objects with non-uniform, rough surfaces, which are often unsuitable for aesthetic or technical applications, and current surface treatment methods either fail to achieve smoothness or use hazardous substances.
Innovation Solution
A surface treatment process involving immersion of three-dimensional objects in a substance mixture A above the polymer's melting point, followed by immersion in a mixture B below the melting point, to smooth and enhance surface uniformity without using toxic substances, combined with a specialized apparatus for this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If additive manufacturing methods are used to produce three-dimensional objects, then rapid production capability is achieved, but the surface becomes rough and non-uniform
Solution Approach 1:
A liquid substance mixture is introduced as an intermediary medium between the rough additive manufacturing process and the desired smooth surface. The liquid penetrates the porous structure and fills surface irregularities, creating a smooth surface without requiring post-processing mechanical operations.
Solution Approach 2:
The physical state and temperature parameters of the liquid substance are controlled to optimize penetration and smoothing effects. The liquid is applied at specific temperatures that enhance its ability to fill pores and smooth the surface while evaporating cleanly without residue.
2Manufacturing precision
If mechanical surface treatment methods like blasting or vibratory finishing are used, then surface smoothness is improved, but delicate components are damaged and inside corners are poorly finished
Solution Approach 1:
The mechanical surface treatment processes (blasting, vibratory finishing) are replaced with a chemical/physical liquid immersion process. The liquid substance smoothly penetrates and fills surface irregularities without mechanical contact, eliminating the risk of damaging delicate components while uniformly treating all surfaces including inside corners.
3Manufacturing precision
If vaporous solvent methods are used to smooth surfaces, then uniform smoothing is achieved, but corrosive and hazardous solvents are required
Solution Approach 1:
Instead of using harmful corrosive solvents, the invention employs a benign liquid substance mixture that achieves the same smoothing effect without corrosion or health hazards. The liquid penetrates and fills surface pores effectively while being safe for the polymer material and environmentally friendly.
Solution Approach 2:
The invention changes the fundamental parameter of the treatment medium from corrosive vaporous solvents to non-corrosive liquid substances. This parameter change maintains the smoothing capability while eliminating all associated hazards including corrosion, health risks, and explosion dangers.
4Manufacturing precision
If concentrated acid heating methods are used for surface treatment, then surface properties are modified, but toxic substances and high temperatures are required
Solution Approach 1:
The invention replaces harmful concentrated acids and extreme heating with a benign liquid substance mixture applied at moderate temperatures. The liquid achieves surface smoothing and property modification through controlled penetration and evaporation, eliminating toxicity and excessive heat requirements.
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 process achieves a significantly reduced surface roughness and increased elongation at break, maintaining mechanical properties while avoiding hazardous chemicals, and allows for additional effects like color or flame retardancy.
Implementation Method 1
The substance mixture A has a temperature which is above the melting point of the polymer
Implementation Method 2
The substance mixture B has a temperature which is below the melting point of the polymer
Data Source
AI summary
A process can be used for the surface treatment of three-dimensional objects which have been produced in additive manufacturing processes from at least one polymer. The process involves a) immersing the three-dimensional object in a substance mixture A, b) leaving the three-dimensional object in the substance mixture A for a time, and c) removing the three-dimensional object from the substance mixture A. The process then involves d) immersing the three-dimensional object in a substance mixture B, e) leaving the three-dimensional object in the substance mixture B for a time, and f) removing the three-dimensional object from the substance mixture B. The substance mixture A has a temperature (process temperature A) which is above the melting point of the polymer, and the substance mixture B has a temperature (process temperature B) which is below the melting point of the polymer.