PECVD SiOx Coating Inspection via Outgassing
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Solution Overview
Problem
Current plastic and glass vessels for pharmaceutical packaging face challenges such as non-uniform surface chemistry, contamination, breakage, and inadequate barrier properties, which affect the stability and shelf life of biologics, necessitating the development of plastic syringes with improved gas and solute barrier properties and lubricity coatings.
Innovation Solution
The method involves coating plastic vessels with PECVD-made SiOx barrier coatings and lubricity coatings using organosilicon precursors, followed by an outgassing inspection to ensure the presence and quality of the coatings, utilizing a charging gas like carbon dioxide to enhance sensitivity and accuracy in the inspection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If plastic vessels are used for pharmaceutical packaging, then manufacturing cost and breakage resistance are improved, but barrier properties and surface chemistry uniformity deteriorate
Solution Approach 1:
The patent applies composite materials by combining plastic vessel walls with deposited barrier coatings (such as silicon oxide, silicon nitride, or other inorganic layers). The plastic provides mechanical strength and breakage resistance, while the deposited coating layer provides the barrier properties against gas and solute transmission. This composite structure resolves the contradiction by integrating the advantages of both materials.
Solution Approach 2:
The patent changes the surface properties of plastic vessels by depositing various coating materials with different barrier characteristics. By selecting and controlling the deposition parameters (coating material composition, thickness, deposition conditions), the barrier properties can be optimized while maintaining the underlying plastic structure's mechanical advantages.
2Reliability
If glass vessels are used for pharmaceutical packaging, then barrier properties are improved, but breakage resistance and manufacturing cost deteriorate
Solution Approach 1:
The patent creates a composite structure where the plastic vessel body provides mechanical strength and breakage resistance, while the deposited coating layer on the inner surface provides barrier properties comparable to glass. This composite approach allows achieving glass-like barrier performance without the fragility and higher cost of glass vessels.
3Manufacturing precision
If PECVD coating process is used, then coating uniformity and barrier properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces mechanical coating methods with PECVD (plasma-enhanced chemical vapor deposition), which uses plasma chemistry to deposit uniform coatings. The plasma process allows for conformal and uniform coating deposition at controlled rates, achieving consistent barrier properties without complex mechanical application systems.
Solution Approach 2:
The patent optimizes PECVD process parameters (gas flow rates, plasma power, pressure, temperature) to achieve uniform coating deposition. By carefully controlling these parameters, the process produces consistent coating thickness and composition, ensuring uniform barrier properties while maintaining processability.
4Measurement precision
If outgassing inspection method is used, then coating quality detection accuracy is improved, but inspection time increases
Solution Approach 1:
The patent performs outgassing inspection by measuring volatile species release from the coated surface. This method provides rapid assessment of coating quality and integrity by detecting outgassing rates, allowing quick identification of defective coatings without lengthy inspection procedures.
Solution Approach 2:
The patent replaces complex visual or tactile inspection methods with outgassing measurement, which uses gas analysis techniques to assess coating quality. This substitution enables automated, objective, and rapid evaluation of coating integrity based on volatile species emission characteristics.
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
This approach provides plastic syringes with enhanced barrier and lubricity properties, ensuring the stability and shelf life of biologics while maintaining economic production and reliability, and allows for quick and accurate inspection of coating quality.
Implementation Method 1
preparing the barrier coating on the interior surface of the vessel by PECVD from an organosilicon precursor under vacuum conditions
Implementation Method 2
the release of at least one volatile species from the coated surface into the gas space adjacent to the coated surface is measured
Implementation Method 3
exposing the interior of the coated vessel to a charging gas and thus charging the coated surface with said charging gas, the charging gas being carbon dioxide
Data Source
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AI summary
A method for inspecting the product of a coating process is provided. Therein, the release of at least one volatile species from the coated surface into the gas space adjacent to the coated surface is measured and the result is compared with the result for at least one reference object measured under the same test conditions. Thus the presence or absence of the coating, and/or a physical and/or chemical property of the coating can be determined. The method is useful for inspecting any coated articles, e.g. vessels. Its application on the inspection of PECVD coatings made from organosilicon precursors, especially of barrier coatings, is also disclosed.