Densified Polymer Powder via Roll Compaction
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Solution Overview
Problem
Conventional methods for manufacturing thermoplastic polymer compositions face inefficiencies due to low bulk density of polymer powders, leading to difficulties in processing, packaging, and storage, as well as inconsistencies in pellet size and density, which affect extrusion operations and product quality.
Innovation Solution
A process involving the compression of polymer feeds with low bulk density using a roll compactor and subsequent milling to achieve a densified polymer powder with a bulk density greater than 250 kg/m3, improving handling and processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polymer powder is produced by conventional methods (steam precipitation, hot water precipitation), then the polymer can be manufactured, but the bulk density remains low (less than 240 kg/m3), causing inefficiencies in packaging, shipping, storing, and processing
Solution Approach 1:
The polymer powder is pre-densified by compression before extrusion processing. This preliminary densification action increases bulk density from less than 240 kg/m3 to greater than 250 kg/m3, eliminating downstream processing issues and improving overall productivity in packaging, shipping, storing, and extrusion operations
Solution Approach 2:
The bulk density parameter of the polymer powder is changed from less than 240 kg/m3 to greater than 250 kg/m3 through compression. This parameter change resolves the technical contradiction by improving packaging, shipping, storing efficiency and extrusion processing efficiency simultaneously
2Manufacturing precision
If low bulk density polymer powder is used in extrusion operations, then the polymer can be processed, but difficulties in feeding occur, preventing steady state processing and resulting in inconsistent pellet size and density
Solution Approach 1:
The polymer powder is pre-densified by compression before extrusion processing. This preliminary densification action increases bulk density from less than 240 kg/m3 to greater than 250 kg/m3, eliminating downstream processing issues and improving overall productivity in packaging, shipping, storing, and extrusion operations
Solution Approach 2:
The bulk density parameter of the polymer powder is changed from less than 240 kg/m3 to greater than 250 kg/m3 through compression. This parameter change resolves the technical contradiction by improving packaging, shipping, storing efficiency and extrusion processing efficiency simultaneously
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 densified polymer powder enhances extrusion performance by preventing bridging, improving strand control, increasing throughput, and reducing yellowness and oxidation issues, resulting in higher quality polymer products with consistent density and particle size.
Implementation Method 1
compressing a polymer feed that has a bulk density of less than or equal to 240 kg/m3 in a roll compactor comprising at least two compaction rolls to obtain a densified polymer material
Data Source
AI summary
Process for manufacturing a densified polymer powder comprising compressing a polymer feed that has a bulk density of less than or equal to 240 kg/m in a roll compactor comprising at least two compaction rolls to obtain a densified polymer material, wherein a gap between the two rolls is 0.5 to 10 mm, wherein the compaction rolls operate at a speed of 3 to 30 rpm, wherein an applied pressure of the roll compactor is 0.5 to 5 MPa, and milling the densified polymer material to obtain a densified polymer powder, wherein a bulk density of the densified polymer powder is greater than or equal to 250 kg/m3.