Borosilicate Glass Composition Reducing Air Lines in Pharmaceutical Containers
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Solution Overview
Problem
Borosilicate glass containers for pharmaceutical vials and ampoules often exhibit stripe-shaped bubble defects, known as 'air lines,' which can lead to contamination and quality issues, despite improved image inspection technologies detecting foreign matters, necessitating a reduction in glass defects.
Innovation Solution
A borosilicate glass composition with specific ranges of SiO2, Al2O3, B2O3, CaO, BaO, Na2O, K2O, SnO2, and Cl, where SnO2 acts as a fining agent to reduce bubbles and improve appearance quality, while maintaining chemical durability and low thermal expansion, thereby minimizing air lines and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image inspection device resolution is improved to detect foreign matters, then detection capability is improved, but glass defects such as air lines are also detected causing false rejection
Solution Approach 1:
The patent applies preliminary action by removing bubbles during the glass melting and fining process before the container is even manufactured. SnO2 is added as a fining agent that reacts with bubbles to form gas pockets that rise and escape during melting, preventing air lines from forming in the first place. This upstream prevention eliminates the need to deal with defects during later inspection stages.
2Manufacturing precision
If SnO2 is added as a fining agent to remove bubbles, then air lines are decreased, but Sn ion elution may increase affecting chemical durability
Solution Approach 1:
The patent applies parameter changes by precisely controlling the SnO2 content within a specific range (0.001-0.08 mass%) and adjusting other compositional parameters (SiO2: 70.0-78.0%, Al2O3: 5.0-8.0%, B2O3: 5.0-12.0%) to optimize both fining effect and chemical durability. By changing these compositional parameters, the glass achieves sufficient bubble removal while maintaining low Sn ion elution and high chemical stability.
Solution Approach 2:
The patent applies composite materials by creating a multi-component glass system where SnO2 works synergistically with other ingredients (SiO2, B2O3, Al2O3, Na2O, K2O, CaO, BaO, Cl) to achieve both fining and chemical durability. The composite glass composition balances the fining effect of SnO2 with the stabilizing effects of other components, particularly the glass network formers and modifiers, to prevent excessive Sn ion elution.
3Reliability
If glass composition is optimized for chemical durability, then resistance to medicament contamination is improved, but production cost may increase
Solution Approach 1:
The patent applies parameter changes by optimizing the glass composition within specific ranges rather than using fixed high-cost formulations. The compositional parameters (SiO2: 70.0-78.0%, B2O3: 5.0-12.0%, Al2O3: 5.0-8.0%, etc.) are tuned to achieve the required chemical durability and fining effect using cost-effective raw materials and standard manufacturing processes, avoiding unnecessary expensive additives.
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 proposed glass composition effectively decreases air lines, enhances chemical durability, and reduces the elution of Sn ions, achieving high-quality glass containers with improved thermal shock resistance and reduced production costs, ensuring safer and more reliable pharmaceutical storage.
Implementation Method 1
SnO2 effectively removes bubbles in a glass in a fining process, thereby decreasing air lines
Data Source
AI summary
A borosilicate glass for a pharmaceutical container having high appearance quality, particularly a small number of air lines, and a glass tube for a pharmaceutical container are provided. The borosilicate glass for a pharmaceutical container contains, in mass %, from 70.0 to 78.0% of SiO2, from 5.0 to 8.0% of Al2O3, from 5.0 to 12.0% of B2O3, from 0 to 4.0% of CaO, from 0 to 4.0% of BaO, from 4.0 to 8.0% of Na2O, from 0 to 5.0% of K2O and from 0.001 to 1.0% of SnO2.