Single Melt Plastic Extrusion System for Additive Blending
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Solution Overview
Problem
The existing process for producing colored plastic products involves multiple steps and separate facilities, leading to high costs and risks of contamination, as well as excessive heat exposure that depletes additives and requires additional UV protectants.
Innovation Solution
A system that uses a main extruder to melt plastic resin and feed it to secondary extruders for blending with additives, allowing for the production of multiple plastic products from a single melt stream, reducing heat exposure and eliminating the need for separate facilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate compounding facilities are used to produce colored plastic products, then product quality and color consistency are improved, but facility costs and operational expenses increase significantly
Solution Approach 1:
The patent combines the compounding and extrusion operations into a single integrated facility. The compounding extruder mixes colorants with resin to create colored pellets, which are then directly fed to the product extruder without requiring separate compounding facilities, intermediate storage, or additional handling equipment. This integration eliminates the need for expensive separate facilities while maintaining product quality through controlled additive injection.
Solution Approach 2:
The integrated system performs multiple functions within a single facility: resin melting, colorant mixing, pellet formation, and final product extrusion. The compounding extruder serves dual purposes by both creating colored pellets and feeding them directly to the product extruder, eliminating the need for dedicated compounding facilities and reducing overall system complexity.
2Manufacturing precision
If multiple sequential extruders are used to blend resins with different characteristics, then mixing quality is improved, but heat exposure increases and depletes stabilizer additives
Solution Approach 1:
The compounding extruder performs preliminary mixing of colorants with resin pellets before the material enters the product extruder. By pre-blending the additives in a controlled environment with optimized residence time and shear conditions, the system achieves thorough mixing in a single pass through the product extruder, eliminating the need for multiple sequential extruders and reducing cumulative heat exposure.
Solution Approach 2:
The system optimizes processing parameters in the compounding extruder (temperature profile, screw speed, residence time) to achieve complete mixing of colorants with resin. This parameter optimization allows the material to be fully prepared before entering the product extruder, eliminating the need for additional mixing stages and reducing total heat exposure while maintaining mixing quality.
3Device complexity
If colorant is blended with resin at the production facility, then facility costs are reduced, but risk of contamination increases
Solution Approach 1:
The compounding extruder acts as an intermediary device that introduces colorants into the resin melt in a controlled manner. Rather than directly adding colorants to the final product extruder, the system first blends them in the compounding section, allowing for controlled mixing and preventing direct contact between colorant feed mechanisms and the main product stream, thereby reducing contamination risk while maintaining cost efficiency.
4Reliability
If separate compounding and production facilities are used, then cross-contamination is prevented, but intermediate storage and handling requirements increase
Solution Approach 1:
The patent merges the compounding and production facilities into a single integrated system where colored pellets are formed and immediately fed to the product extruder through a direct connection. This eliminates the need for separate compounding facilities, intermediate storage silos, and additional handling equipment, while maintaining contamination prevention through controlled material flow and isolated additive injection points.
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 approach decreases the total heat exposure of the polymer, lowers the consumption of stabilizers, reduces facility costs, and enables the production of different plastic products without cross-contamination, while minimizing the footprint and operational expenses.
Implementation Method 1
an extruder configured to melt a plastic resin to form a melt
Implementation Method 2
an extruder configured to melt a plastic resin to form a melt
Implementation Method 3
a second product extruder that is configured to blend the melt with a product additive to form a second product melt
Implementation Method 4
a diverter system that is configured to transfer at least a portion of the melt to a secondary product extruder system
Data Source
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AI summary
Systems (200) and methods for making different plastic products (202, 204) in a single melting process are provided. A method includes melting a plastic resin in a first extruder (104) to form a melt (106) and transferring at least a portion of the melt to a second extruder (114). Any portion of the melt (106) that is not transferred to the second extruder (114) is formed into a first plastic product (202). Additives (116) are blended with the melt in the second extruder to form a second melt (118), and a second plastic product (204) is formed from the second melt (118).