Quartz Glass Cloth Humidity-Controlled Packaging
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Solution Overview
Problem
The high purity of quartz glass cloth leads to water adsorption on its surface, causing fluctuations and worsening of the dielectric loss tangent, especially during transportation and packing, which affects its performance in high-frequency applications.
Innovation Solution
A method for packing quartz glass cloth with a packaging film that controls absolute humidity within the package to 10.0 g/m3 or less, using a desiccant and specific packaging materials to maintain low dielectric loss tangent, ensuring the quartz glass cloth remains effective over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quartz glass cloth with high purity (at least 99.5 wt% SiO2) is used to achieve low dielectric loss tangent, then the dielectric loss tangent initially improves, but the dielectric loss tangent worsens over time due to water adsorption on the surface
Solution Approach 1:
The patent applies the inert atmosphere principle by creating a controlled low-humidity environment inside the packaging film. The package is filled with dry air or inert gas having absolute humidity of 10.0 g/m³ or less, and sealed to prevent moisture ingress. This inert environment prevents water adsorption on the quartz glass cloth surface, thereby maintaining the low dielectric loss tangent over time without chemical modification of the glass cloth itself.
Solution Approach 2:
The patent uses dry air or inert gas as an intermediary substance between the quartz glass cloth and the external environment. This intermediary medium absorbs or blocks moisture, preventing direct contact between water vapor and the glass cloth surface. The packaging film acts as another intermediary barrier to maintain the controlled humidity environment during storage and transport.
2Ease of manufacture
If quartz glass cloth is packed in conventional packaging without humidity control, then packing simplicity is maintained, but water adsorption occurs causing dielectric loss tangent to fluctuate and worsen
Solution Approach 1:
The patent applies parameter changes by controlling the absolute humidity parameter of the packaging environment to 10.0 g/m³ or less. This quantitative control of humidity parameter prevents water adsorption while maintaining practical packaging simplicity. The method involves filling the package with pre-dried air or inert gas and sealing it, which is relatively simple to implement industrially.
Solution Approach 2:
The patent implements preliminary action by pre-drying the air or inert gas before introducing it into the packaging film. The humidity control is established before the quartz glass cloth is exposed to the packaging environment during storage and transport. This proactive approach prevents moisture adsorption from occurring in the first place, rather than attempting to remove moisture after adsorption.
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 effectively maintains a low dielectric loss tangent in quartz glass cloth, preventing worsening during storage and use, thus ensuring reliable performance in high-frequency applications.
Implementation Method 1
Si—OH groups at the surface readily adsorb moisture via hydrogen bonds
Implementation Method 2
the package has a volumetric absolute humidity therein of 10.0 g/m3 or less
Data Source
AI summary
A method for packing quartz glass cloth includes the step of packing quartz glass cloth that is at least 99.5 wt % comprised of SiO2 with packaging film to form a package, wherein the package has a volumetric absolute humidity therein of 10.0 g/m3 or less.