Fused Quartz Pharmaceutical Container Surface Defect Reduction
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Solution Overview
Problem
Pharmaceutical packaging containers made from traditional glasses like borosilicate and soda-lime silicate suffer from cationic extraction issues, leading to drug instability and contamination due to delamination and redeposited glass particles, which are difficult to manufacture and maintain, especially for high-throughput production.
Innovation Solution
A fused quartz glass container with a low concentration of surface features, manufactured using a process that involves forming external features on a glass tube, purging with an inert gas, and separating it to create containers with a surface feature density of 50 or fewer features per square centimeter, reducing redeposited glass particles and enhancing chemical durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional glasses (borosilicate, soda-lime silicate) are used for pharmaceutical packaging, then the containers are easy to manufacture with standard glass melting equipment, but they suffer from cationic extraction issues leading to drug instability and contamination
Solution Approach 1:
The patent changes the chemical composition parameters of the glass material by using fused quartz glass with high silica content (≥99.9%) and minimal cationic content (Na+ ≤10 ppm, Li+ ≤5 ppm, K+ ≤5 ppm, Mg2+ ≤5 ppm, Ca2+ ≤5 ppm, Ba2+ ≤5 ppm), thereby achieving both chemical durability and manufacturability
Solution Approach 2:
The patent uses fused quartz glass as a composite material that combines high purity silica with trace amounts of controlled cations, creating a material that maintains chemical durability while being processable with standard equipment
2Reliability
If fused quartz glass is used for pharmaceutical packaging, then chemical purity and durability are improved, but manufacturing difficulty increases due to high processing temperatures required
Solution Approach 1:
The patent modifies the processing parameters by optimizing the melting temperature range (1600-2000°C) and holding time to achieve complete fusion of silica particles while preventing excessive cationic extraction, thereby making fused quartz glass manufacturable with standard equipment
3Productivity
If glass containers are manufactured using conventional processes, then production speed is maintained, but surface defects and redeposited glass particles increase
Solution Approach 1:
The patent applies preliminary actions during the manufacturing process including purging the mold with inert gas before injection, controlling the injection speed and temperature, and optimizing the cooling rate to prevent glass particle redeposition and surface defects while maintaining high production speed
Data Source
AI summary
A quartz glass container is shown and described herein. The quartz glass container exhibits a low concentration of surface defects on an inner surface of the container. In aspects hereof, the container may have a surface defect density of 50 or fewer surface defects per square centimeter within a 1 cm band centered 1 cm from the base of the container.