HDPE Fiber Composite Melt Impregnation Uniform Density
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Solution Overview
Problem
Conventional fiber composite production techniques, such as solvent-based and aqueous-based impregnation methods, are expensive and complex, while melt impregnation methods often result in low fiber weight fraction, uneven density, and issues like necking and dry spots due to matrix material properties.
Innovation Solution
A fiber composite comprising at least 60 wt.% fiber material and a HDPE resin composition with a HDPE polymer and metallocene polyethylene wax, which includes a melt impregnation process to achieve uniform density and reduce dry spots, using a HDPE resin composition with specific viscosity and melt strength properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional solvent-based and aqueous-based impregnation techniques are used, then fiber composites can be produced, but the production cost increases and manufacturing complexity increases
Solution Approach 1:
The patent changes the physical state parameter of the matrix material from liquid (solvent-based) or aqueous to molten state (melt impregnation), eliminating the need for solvents and complex drying/curing processes. This reduces manufacturing complexity while maintaining fiber composite quality through direct consolidation of fibers in the molten matrix.
Solution Approach 2:
The patent extracts and eliminates the solvent component from conventional impregnation techniques, using only molten thermoplastic matrix material. This removes the need for solvent removal steps, reducing both manufacturing complexity and production cost while achieving effective fiber impregnation.
2Strength
If melt impregnation with high viscosity matrix material is used, then melt strength is maintained, but necking and breakage occur during casting
Solution Approach 1:
The patent modifies the viscosity parameter of the matrix material by selecting thermoplastic polymers with appropriate molecular weight and flow characteristics. This enables the matrix to have low enough viscosity for uniform impregnation and casting without necking, while maintaining sufficient melt strength through controlled cooling and crystallization.
Solution Approach 2:
The patent uses composite resin compositions containing thermoplastic polymers combined with polyethylene wax additives. The wax component modifies the rheological properties, reducing viscosity and improving flow characteristics during impregnation, while the thermoplastic matrix maintains structural integrity and melt strength.
3Ease of manufacture
If melt impregnation with low viscosity matrix material is used, then ease of impregnation is improved, but necking and breakage occur during casting
Solution Approach 1:
The patent optimizes the temperature parameter during the impregnation process, maintaining the matrix material in a molten state with controlled viscosity. Upon contact with cooler fibers and模具, the matrix rapidly cools and solidifies, preventing necking and breakage while ensuring complete fiber impregnation during the brief liquid phase.
4Strength
If high fiber weight fraction is targeted (≥60 wt.%), then structural characteristics are improved, but matrix material distribution becomes uneven
Solution Approach 1:
The patent employs continuous melt impregnation where molten matrix material continuously flows through and coats the fiber bundle, ensuring uniform distribution even at high fiber fractions. The continuous nature of the process prevents dry spots and ensures consistent matrix coverage throughout the composite structure.
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 solution results in fiber composites with improved uniform density, reduced dry spots, and correct matrix material distribution, addressing the limitations of conventional methods by enhancing the physical and chemical properties of the composites.
Implementation Method 1
a HDPE resin composition containing a HDPE polymer and a metallocene polyethylene wax
Implementation Method 2
a HDPE resin composition containing a HDPE polymer and a metallocene polyethylene wax, which includes a melt impregnation process to achieve uniform density and reduce dry spots
Implementation Method 3
melt impregnation process to achieve uniform density and reduce dry spots
Data Source
Figure 1A~1C
AI summary
A fiber composite containing at least 60 wt. %, of a fiber material and a high density polyethylene (HDPE) resin composition containing a HDPE polymer and a metallocene polyethylene wax and methods of making the fiber composite.