Organic Fiber Composite Mixing Bulk Density Control
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Solution Overview
Problem
Existing wood-polymer composites face challenges in achieving uniform wetting of organic natural fibers with a matrix material, leading to fiber agglomerates and poor dispersion, which affects the mechanical properties and appearance of the final product.
Innovation Solution
A method and system for manufacturing a composite product involving the mixing of organic natural fibers with a thermoplastic matrix material, where the fibers are crushed to reduce bulk density, mixed without heavy compression, and contacted with a partly melted matrix in a vacuum or inert gas environment to prevent fiber bonding and ensure even wetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic natural fiber material is mixed with matrix material under heavy compression, then the mixing process is simplified, but fiber agglomerates form and uniform wetting is prevented
Solution Approach 1:
The patent applies parameter changes by controlling the bulk density of organic natural fiber material to be less than 500 kg/m³ and limiting compression pressure to less than 2 bars during the contacting step. This prevents fiber agglomeration while maintaining manageable mixing conditions, achieving both ease of manufacture and manufacturing precision.
Solution Approach 2:
The patent applies preliminary action by crushing the organic natural fiber material before the contacting step to form bulky fiber material with controlled bulk density. This pre-treatment ensures uniform distribution and prevents agglomerate formation during mixing, resolving the contradiction between process simplicity and fiber distribution uniformity.
2Productivity
If fiber material is compressed to reduce bulk density, then mixing efficiency improves, but fiber bonding occurs and dispersion is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling bulk density (less than 500 kg/m³) and compression pressure (less than 2 bars) to achieve optimal mixing efficiency without causing fiber bonding. This resolves the contradiction between productivity and composition stability.
Solution Approach 2:
The patent replaces heavy mechanical compression with controlled bulk density management and vacuum/inert gas environment, achieving efficient mixing without the harmful effects of excessive compression that cause fiber bonding and reduced dispersion.
3Manufacturing precision
If vacuum or inert gas is used during mixing, then fiber wetting is improved, but process complexity increases
Solution Approach 1:
The patent applies inert atmosphere by conducting the mixing process under vacuum or inert gas (nitrogen, air, helium) to prevent oxidation and improve fiber wetting uniformity. This resolves the contradiction by achieving superior manufacturing precision while the complexity increase is justified by the significant improvement in fiber dispersion and wetting 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 method ensures even distribution and adhesion of fibers within the matrix, preventing agglomerates and achieving a light color with improved mechanical properties and dispersion, resulting in a composite product with enhanced quality.
Implementation Method 1
the matrix material that is at least partly in a form of melt
Implementation Method 2
at least one mixer that is capable of heating the mixture is used in the primary mixing stage
Data Source
AI summary
The invention relates to a method for manufacturing a composite product comprising organic natural fiber material and matrix material, wherein the method comprises mixing the organic natural fiber material with the matrix material in a primary mixing stage to form a mixture. The primary mixing stage comprises a contacting step in which the organic natural fiber material comes in contact with the matrix material that is at least partly in a form of melt, and bulk density of the organic natural fiber material is less than 500 kg/m3. The method further comprises forming a composite product comprising the mixture. Further, the invention relates to a composite product, a use of the composite product, and a system for manufacturing a composite product.