Polymer Granule Surface Coloring via Controlled Melting
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Solution Overview
Problem
Current methods for dyeing and adding additives to thermoplastic and thermosetting polymers, such as extrusion processes, result in mechanical and optical property degradation, high energy consumption, and increased production costs, particularly for small lots, due to thermomechanical stress and the need for specific equipment, while also being inefficient for thermosetting polymers which can undergo irreversible thermocuring.
Innovation Solution
A process involving a high-speed mixer where the polymer is heated to the melting temperature of the dyes or additives, and then mixed at high speed to create a surface layer of uniformly distributed color and additives, potentially with a protective sealing layer, allowing for efficient coloring and addition of additives without melting the polymer, thus maintaining mechanical and optical properties and reducing energy and equipment costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If extrusion process is used to dye and add additives to polymer, then homogeneous distribution of color and additives is achieved, but mechanical and optical properties of polymer are degraded
Solution Approach 1:
The invention changes the temperature parameter by heating the polymer to a temperature below its melting point (but above the dye melting point), allowing the dye to melt and distribute uniformly without melting the polymer itself. This parameter change enables homogeneous distribution while preserving mechanical properties.
Solution Approach 2:
The invention uses the dye substance itself as an intermediary medium. The dye acts as a carrier that facilitates uniform distribution of additives while the polymer remains in a solid state, avoiding the need for high-temperature melting that would degrade mechanical properties.
2Stability of the object's composition
If extrusion process is used to dye and add additives to polymer, then close mixing is achieved, but energy consumption increases
Solution Approach 1:
The invention changes the temperature parameter to a level below polymer melting point, significantly reducing the energy input required compared to traditional extrusion. The heating element maintains temperature just sufficient to melt the dye, not the polymer, thereby reducing energy consumption while achieving close mixing.
Solution Approach 2:
The invention replaces the mechanical extrusion system with a thermal field-based system. Instead of using mechanical force and high-temperature melting to achieve mixing, the process uses controlled heating to melt the dye and facilitate uniform distribution through diffusion, substituting mechanical energy with thermal energy at lower temperatures.
3Productivity
If extrusion process is used for polymer processing, then continuous production is achieved, but production costs increase for small lots
Solution Approach 1:
The invention segments the polymer processing into discrete batches rather than continuous extrusion. Each batch can be independently processed and colored, allowing flexible production sizes. This segmentation enables cost-effective small lot production while maintaining the ability to process larger batches when needed.
Solution Approach 2:
The invention introduces dynamic flexibility to the production process. The batch processing system allows adjustment of production parameters and quantities based on specific customer requirements, making the system adaptable to both small lots and large-scale production, thereby reducing costs for small batches compared to fixed continuous extrusion.
4Temperature
If high temperature is applied to melt polymer for dyeing, then fluidity for mixing is achieved, but thermomechanical stress degrades polymer properties
Solution Approach 1:
The invention changes the temperature parameter to a critical threshold below the polymer melting point. By maintaining the temperature just high enough to melt the dye (but not the polymer), the process achieves the necessary fluidity for mixing while avoiding the thermomechanical stress that would degrade polymer properties.
Solution Approach 2:
The invention uses the dye substance as an intermediary that requires melting to function. The dye acts as a thermal indicator and mixing medium, allowing the polymer to be heated to the dye's melting point without reaching the polymer's melting point, thus avoiding thermomechanical stress while achieving necessary fluidity.
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
This process enables efficient, cost-effective coloring and addition of additives to various polymers, including thermosetting ones, without degrading their properties, and allows for production of small lots without the need for complex equipment, maintaining mechanical and optical characteristics while ensuring precise color control.
Implementation Method 1
the polymer is heated to the melting temperature of the dyes or additives
Implementation Method 2
heated to the melting temperature of the dyes or additives, and then mixed at high speed to create a surface layer
Data Source
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AI summary
A description follows of a granule, flake or powder of a thermoplastic and/or thermosetting polymer, coloured and/or containing additives, consisting of a nucleus of neutral thermoplastic and/or thermosetting polymer and a surface layer of dye and/or additive. A process is also described for the preparation of a granule, flake or powder of thermoplastic and/or thermosetting polymer, coloured and/or containing additives, characterized in that it comprises the following passages: a) the granule, flake or powder of polymer to be dyed and/or additivated is placed in a high-speed mixer and heated to the melting temperature of the dye(s) and/or additive (s); b) the dye(s) and/or additive (s) are added to the mixer and the system mixed at a high speed and c) the granule, flake or powder of thermoplastic and/or thermosetting polymer, coloured and/or containing additives is discharged.