Monomer Saturation for Fiber-Reinforced Composite Production
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Solution Overview
Problem
The production of fiber-reinforced composite materials faces challenges such as incomplete wetting of fibers due to high polymer viscosity, limiting continuous processing and leading to material weakness, and the generation of offcut waste that is difficult to reuse, especially in mass production scenarios.
Innovation Solution
A process where fibers are saturated with a monomer, and then flakes or individual fibers are added, allowing for the adjustment of component properties and utilization of offcut waste by comminuting and reintegrating it into the production process, enabling the production of both long- and short-fiber-reinforced components through a compressing mold or injection-molding machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fibers are saturated with polymer melt, then fiber wetting is achieved, but high viscosity prevents complete wetting and causes material weakness
Solution Approach 1:
The patent changes the physical state parameter of the polymer from melt to monomer form. By using monomer instead of polymer melt for fiber saturation, the viscosity is dramatically reduced, enabling complete and uniform fiber wetting. The polymerization then occurs after saturation, ensuring thorough impregnation while achieving complete polymerization for optimal material strength.
2Ease of manufacture
If monomer casting is used for thermoset polymers, then fiber saturation is achieved, but continuous processing is not possible because components must harden in the mold
Solution Approach 1:
The patent segments the manufacturing process into two independent stages: (1) fiber saturation with monomer, which can be done continuously and produces semifinished products, and (2) polymerization hardening, which occurs later in the mold. This separation allows continuous production of saturated fiber preforms that can be stored and transported, then processed into final components on-demand, eliminating the bottleneck of simultaneous saturation and hardening.
3Loss of substance
If offcut from cutting semifinished products is produced, then waste material is generated, but the offcut cannot be effectively reused due to incomplete polymerization
Solution Approach 1:
The patent implements a recovery system for offcut material. Instead of discarding the offcut from semifinished product cutting, it is collected and reintroduced into the production process. The offcut, containing monomer-saturated fibers, is fed back into the saturation line where additional monomer is applied and polymerization is completed, converting waste into usable material and reducing overall waste generation.
4Productivity
If polymerization is completed immediately after saturation to avoid dripping, then processing speed is maintained, but the polymerization step limits production throughput
Solution Approach 1:
The patent performs the saturation action preliminarily, before the polymerization step. Fibers are saturated with monomer in advance to create stable semifinished products that can be stored and transported without dripping or degradation. The polymerization is then completed later during final component formation, allowing the saturation and polymerization steps to be decoupled in time, thereby increasing overall production throughput while maintaining processing speed.
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
This approach reduces waste utilization, allows for specific reinforcement, and improves the mechanical properties of the final product by effectively incorporating offcut material, enabling efficient production of high-quality components with reduced storage and processing requirements.
Implementation Method 1
fibers are saturated with monomer, whereafter flakes or individual fibers are added... polymerization of which is completed in the mold
Data Source
AI summary
A process for the production of fiber-reinforced components or semifinished products is provided, where fibers are saturated with monomer. The process includes at least one of adding flakes including fibers and adding individual fibers. For this, the fibers, the monomer, and the flakes including fibers and/or the individual fibers are added to an injection-molding machine and forced into an injection mold, whereupon polymerization of the monomer is completed in the injection mold. Alternatively a fiber structure on a conveyor belt is saturated with a solution including a monomer, optionally including an activator, and optionally including a catalyst. In a following step, individual fibers and/or flakes including fibers are distributed on the saturated fiber structure, the fiber structure is passed through a roll pair in which pressure is exerted onto the fiber structure, and finally the saturated fiber structure is cooled so that the monomer solidifies.