Glass Fiber Composition Balancing Spinnability and Thermal Expansion
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Solution Overview
Problem
The glass composition for glass fiber described in Japanese Patent Application No. 2022-083983 suffers from crystallization of molten glass inside the bushing during industrial production in large quantities over a long period, leading to nozzle clogging and phase separation, deteriorating spinnability and chemical durability, especially when produced in large quantities over a long period of time, deteriorating the spinnability and chemical durability of glass fibers, and phase separation, which results in production cuts and makes it difficult to continue production.
Innovation Solution
The composition includes specific ranges of SiO2, Al2O3, ZnO, MgO, and Li2O, and Li2O, and Li2O, and Li2O, Na2O, and K2O in the glass composition for glass fiber, with a low coefficient of linear thermal expansion, a low 1000 poise temperature, and suppressed phase separation, enabling continuous production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass fiber is produced in large quantities over a long period using the composition from Japanese Patent Application No. 2022-083983, then high elastic modulus and low coefficient of linear thermal expansion are achieved, but molten glass crystallizes inside the bushing causing nozzle clogging and production discontinuation
Solution Approach 1:
The patent modifies the glass composition parameters by adjusting the content ranges of SiO2, Al2O3, ZnO, P2O5, MgO, and other oxides to achieve a composition that maintains high elastic modulus and low thermal expansion while preventing crystallization during continuous production. Specifically, the balanced composition with controlled amounts of each oxide component changes the melting and crystallization behavior of the glass, allowing continuous spinning without nozzle clogging.
Solution Approach 2:
The patent creates a composite glass composition that combines multiple oxide components in specific proportions to achieve conflicting properties simultaneously: high elastic modulus, low coefficient of linear thermal expansion, and resistance to crystallization during prolonged heating. This composite approach allows the glass to exhibit multiple desirable characteristics that cannot be achieved with a single oxide component.
2Ease of operation
If the liquid phase temperature is lowered to improve spinnability, then the working temperature range increases, but the coefficient of linear thermal expansion increases
Solution Approach 1:
The patent achieves a breakthrough by modifying the glass composition to simultaneously lower the liquid phase temperature and maintain a low coefficient of linear thermal expansion. This is accomplished through a specific balance of oxide components that collectively adjust the thermal and mechanical properties of the glass, resolving the traditional trade-off between spinnability and thermal stability.
3Productivity
If the number of nozzle tips is increased to produce glass fiber in large quantities, then productivity increases, but the bushing volume increases causing temperature bias and crystallization
Solution Approach 1:
The patent modifies the glass composition parameters to reduce sensitivity to temperature variations and prevent crystallization even in large-volume bushings with inherent temperature gradients. The adjusted oxide composition creates a glass melt that remains stable and fluid across a wider temperature range, allowing high-productivity production with numerous nozzle tips without suffering from temperature bias-induced crystallization.
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 glass composition achieves a low coefficient of linear thermal expansion, a wide working temperature range, and suppressed phase separation, ensuring stable production of glass fibers with improved spinnability and chemical durability.
Implementation Method 1
suppressed phase separation
Implementation Method 2
1000 poise temperature
Implementation Method 3
low coefficient of linear thermal expansion
Data Source
AI summary
Provided is a glass composition for glass fiber that enables molten glass with a low 1000 poise temperature, a wide working temperature range, and suppressed phase separation to be obtained, and that enables, when glass fiber is produced using the molten glass, glass fiber with a low coefficient of linear thermal expansion without deteriorating spinnability even if mass production is performed over a long period of time. The glass composition for glass fiber of the present invention includes 42.00 to 63.00% by mass of SiO2, 19.00 to 27.30% by mass of Al2O3, more than 3.00% by mass and 13.00% by mass or less of ZnO, 6.50 to 19.00% by mass of P2O5, 0.00 to 7.00% by mass of MgO, and 1.00% by mass or less in total of Li2O, Na2O, and K2O, with respect to the total amount.