Poly(arylene ether) Compression Molding for Bulk Density

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Solution Overview

Problem

Poly(arylene ether) powder has a low density and wide particle size distribution, making it difficult to process efficiently, as it requires large volumes for storage and transportation and is challenging to feed into extruders at high rates due to its fluffy nature.

Innovation Solution

A method of compression molding poly(arylene ether) powder using compaction equipment with pressure applied at a temperature below the glass transition temperature to increase density and improve processability, resulting in articles with higher compressive strength and reduced volume.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If poly(arylene ether) powder is used in its original fluffy form, then it is easy to handle and process, but it has low density requiring large volumes for storage and transportation

Engineering Contradiction:

Improveease of handlingVSAvoidbulk density

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The patent applies compression molding to change the physical state of poly(arylene ether) from fluffy powder to dense pellets, fundamentally altering its density parameter from ≤0.6 g/cm³ to significantly higher values, thereby resolving the contradiction between ease of handling and bulk density

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If poly(arylene ether) powder is compressed to increase density, then storage and transportation volume is reduced, but the processing complexity increases

Engineering Contradiction:

Improvebulk densityVSAvoidprocessing complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The compression molding process is performed as a preliminary step before extrusion and fabrication, converting fluffy powder to dense pellets in advance. This preliminary action simplifies subsequent processing by providing a material that is easier to feed into extruders at high rates

Inventive Principle:

Principle #10Preliminary action

3Productivity

If poly(arylene ether) powder is fed at higher feed rates, then productivity increases, but the fluffy nature makes it difficult to feed efficiently

Engineering Contradiction:

Improvefeed rateVSAvoidease of feeding

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

By changing the physical form from fluffy powder to compressed pellets through compression molding, the material's flow characteristics and feedability are dramatically improved, enabling higher feed rates into extruders and thus increasing productivity

Inventive Principle:

Principle #35Parameter changes

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 effectively increases the bulk density of poly(arylene ether) powder, reducing storage and transportation costs and enabling higher feed rates into extruders, while maintaining or improving mechanical properties.

Implementation Method 1

subjecting the powder in the compression mold to a pressure sufficient to produce an article having a density greater than the unheated poly(arylene ether) powder

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 2

the pressure is applied at a temperature less than the glass transition temperature of the poly(arylene ether) powder

Methodology Applied

Scientific EffectGlass transition:

Data Source

PatentUS7947204B2Poly(arylene ether) compression molding

Publication Date: 2011.05.24 SHPP GLOBAL TECH BV

AI summary

A method for compression molding of poly(arylene ether) powder comprises introducing a powder comprising unheated poly(arylene ether) powder to compaction equipment comprising a compression mold and subjecting the powder in the compression mold to a pressure sufficient to produce an article having a density greater than the unheated poly(arylene ether) powder wherein the pressure is applied at a temperature less than the glass transition temperature of the poly(arylene ether) powder.