Glass Direct Roving Sizing for Fuzz Reduction
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Solution Overview
Problem
Existing glass direct roving production methods result in fuzzing, decreased lubricity, and reduced mechanical strength when combined with matrix resin, due to inadequate sizing agent performance during thermal drying, leading to poor workability and impregnation with resin.
Innovation Solution
A method involving the application of an epoxy resin with an epoxy equivalent of 180 to 240, followed by thermal drying at 135° C. to 155° C. for three to five hours, forms a coating on glass filaments, enhancing workability and mechanical strength of the composite material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal drying is applied to the sizing agent, then the coating is formed on the glass filaments, but fuzzing occurs and lubricity decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thermal drying temperature (135-155°C) and duration (3-5 hours) to optimize the coating formation while minimizing harmful effects. This specific parameter range allows the sizing agent to form an effective coating without causing excessive fuzzing or losing lubricity, directly resolving the contradiction between coating quality and surface property preservation.
Solution Approach 2:
The patent uses a composite sizing agent formulation containing epoxy resin (180-240 epoxy equivalent) combined with other components that work synergistically during thermal drying. This composite approach allows the coating to achieve both adhesion and lubricity, preventing fuzzing while maintaining the necessary surface properties for workability.
2Ease of operation
If the glass strand has poor spreadability, then the impregnation with matrix resin decreases, but the mechanical strength of the composite is reduced
Solution Approach 1:
The patent modifies the chemical and physical parameters of the sizing agent through controlled thermal drying conditions (135-155°C for 3-5 hours), which transforms the coating properties to enhance spreadability. This parameter control ensures the coating remains sufficiently lubricious and spreadable during composite formation while maintaining mechanical strength through proper coating integrity.
Solution Approach 2:
The patent applies local quality by ensuring the sizing agent coating has specific local properties on the glass filament surfaces - sufficient lubricity and spreadability at the surface level for resin impregnation, while maintaining structural integrity for mechanical strength. The controlled thermal drying creates this localized optimal coating quality.
3Manufacturing precision
If the sizing agent is thermally dried at high temperature, then the coating forms effectively, but the workability and strand spreadability are compromised
Solution Approach 1:
The patent resolves this contradiction by implementing a specific temperature-time parameter range (135-155°C for 3-5 hours) that balances coating formation effectiveness with preservation of workability. This optimized parameter set ensures the coating forms properly without excessive thermal degradation that would compromise spreadability and workability.
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 improves the workability and mechanical strength of the glass direct roving, ensuring effective impregnation with resin and reducing fuzzing and lubricity issues, thereby enhancing the composite material's performance.
Implementation Method 1
thermally drying the sizing agent at a temperature of 135° C. to 155° C. to form a coating on the surfaces of the glass filaments
Data Source
AI summary
Provided is a method for producing a glass direct roving that has excellent workability and can effectively increase the mechanical strength of a composite material obtained by combination with resin. A method for producing a glass direct roving 10 formed by directly winding up a bundle of glass filaments includes the steps of: applying a sizing agent containing an epoxy resin having an epoxy equivalent of 180 to 240 to surfaces of a plurality of glass filaments to bundle the plurality of glass filaments; winding up a bundle obtained by bundling the plurality of glass filaments, thus making a wound package; and thermally drying the sizing agent at a temperature of 135° C. to 155° C. to form a coating on the surfaces of the glass filaments.