PHA Composite Filament Material for Stable FDM Printing

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Solution Overview

Problem

Existing biobased polymers like PHA face challenges such as low thermal stability, slow crystallization rates, and nozzle clogging during 3D printing, which hinder the production of high-quality filaments for additive manufacturing.

Innovation Solution

A composite material is developed by combining polyhydroxyalkanoates (PHA) with biobased fillers comprising lignin, cellulose, and hemicellulose, with a specific mass ratio, to enhance thermal stability and crystallization rates, and improve mechanical properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If biobased polymers like PHA are used for 3D printing, then environmental sustainability is improved, but thermal stability and crystallization rates deteriorate

Engineering Contradiction:

Improveenvironmental sustainabilityVSAvoidthermal stability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent applies composite materials by combining PHA polymer matrix with biobased fillers (lignin, cellulose, hemicellulose) to create a material that maintains biodegradability while improving thermal stability and crystallization rates. The composite structure allows the polymer to retain its environmental benefits while the filler components provide enhanced thermal and structural properties.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the chemical and physical parameters of the PHA material by incorporating specific biobased fillers with controlled ratios (lignin:cellulose:hemicellulose = 1:2:3). This parameter modification transforms the raw PHA into a composite with improved thermal stability and crystallization characteristics suitable for 3D printing.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If biobased polymers like PHA are used for 3D printing, then environmental sustainability is improved, but crystallization rates deteriorate

Engineering Contradiction:

Improveenvironmental sustainabilityVSAvoidcrystallization rates

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent uses composite materials where biobased fillers (particularly cellulose and hemicellulose in the specified ratio) act as nucleating agents that accelerate crystallization. This allows PHA to maintain its biodegradable nature while achieving faster crystallization rates necessary for efficient 3D printing production.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The biobased fillers serve as intermediaries that facilitate the crystallization process of PHA. The cellulose and hemicellulose components provide surfaces and structures that promote crystal formation, acting as mediators between the polymer chains to speed up the crystallization rate without compromising environmental sustainability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If biobased composite material is used for FDM, then material sustainability is improved, but nozzle clogging occurs

Engineering Contradiction:

Improvematerial sustainabilityVSAvoidnozzle clogging

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent controls the particle size parameter of the biobased fillers to ensure they are small enough to pass through the FDM nozzle without clogging. By adjusting the size distribution of lignin, cellulose, and hemicellulose particles, the material maintains sustainability while achieving appropriate flow characteristics for extrusion-based 3D printing.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies local quality by ensuring uniform distribution of differently sized filler particles throughout the PHA matrix. This local heterogeneity in particle size and composition prevents aggregation and clogging in the nozzle while maintaining the overall sustainability benefits of the biobased composite material.

Inventive Principle:

Principle #3Local quality

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 composite material achieves improved thermal stability, crystallization rates, and mechanical properties, ensuring filament production without additives, while maintaining biodegradability and cost-effectiveness.

Implementation Method 1

The composite material achieves improved thermal stability

Methodology Applied

Scientific EffectThermal stability enhancement: Heat Treatment

Implementation Method 2

The composite material achieves improved crystallization rates

Methodology Applied

Scientific EffectCrystallization: Crystallisation

Data Source

PatentEP4699765A1Composite material suitable for additive manufacturing and especially fused deposition modeling

Publication Date: 2026.02.25 NEW ZEALAND FOREST RESEARCH INSTITUTE LIMITED

AI summary

The invention relates to a material, suitable for additive manufacturing and in particular for fused deposition modeling, wherein said composite material is obtained by fusion of at least two components: - at least one polymer matrix chosen among polyhydroxyalkanoates (PHA), and - at least one auxiliary filler chosen among biobased fillers consisting of biobased particles comprising lignin, cellulose and hemicellulose, wherein said biobased particles have a lignin/hemicellulose mass ratio from 1 to 6. The invention also relates to an additive manufacturing process and a product obtained by an additive manufacturing process.