Sterile Packaging Laminate for Visible Seal Seam Defects
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Solution Overview
Problem
The existing packaging for sterile pharmaceutical products, such as vials and syringes, faces challenges in ensuring sterility due to impermeable seal seams, which can lead to defects like undersealing and oversealing, making it difficult to detect sealing issues during production and compromising the integrity of the packaging.
Innovation Solution
A packaging design featuring a bag composed of a selectively permeable nonwoven fabric and a laminated film with a polymer film, lamination adhesive, and pigmented internal film, where the external polymer film has a higher melting point than the sealing-initiation temperature, allowing for improved seal seam strength and visibility of defects through contrast-standardized greyscale imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seal seams are made impermeable and durable, then sterility is improved, but detection of sealing defects becomes difficult
Solution Approach 1:
The patent applies a color-changing indicator system where the bag material or seal seam contains substances that change color or optical properties when exposed to sterilization conditions (ethylene oxide, steam, or radiation). This allows visual detection of whether sterilization occurred and identifies defective seal seams, resolving the contradiction by making previously invisible defects detectable while maintaining sterility.
Solution Approach 2:
The patent introduces an intermediary indicator substance or layer between the seal seam and the external environment. This intermediary changes its properties (color, transparency, fluorescence) in response to sterilization exposure or seal defects, enabling detection without compromising the impermeable seal that maintains sterility.
2Ease of manufacture
If conventional sealing methods are used, then manufacturing simplicity is maintained, but seal seam defects such as undersealing and oversealing occur
Solution Approach 1:
The patent incorporates real-time feedback mechanisms during the sealing process, such as optical sensors or indicators that monitor seal seam formation and provide immediate feedback on seal quality. This allows adjustment of sealing parameters (temperature, pressure, time) to prevent defects while maintaining manufacturing simplicity through automated control.
Solution Approach 2:
The patent applies preliminary actions by pre-treating the bag material or seal seam with indicator substances before sealing, or by pre-programming sealing parameters based on material characteristics. This preliminary preparation ensures consistent seal quality and prevents defects like undersealing and oversealing while keeping the actual sealing process simple.
3Object-affected harmful factors
If the external layer melting point is raised above the internal layer sealing temperature, then thermal stress on nonwoven fabric is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent employs composite laminated film structures with multiple layers having different melting points and functions. The external layer has a higher melting point to protect the nonwoven fabric from thermal stress during sealing, while the internal layer has a lower melting point for effective sealing. This composite structure, while more complex than single-layer films, provides the necessary thermal protection and sealing performance.
Solution Approach 2:
The patent applies local quality by assigning different thermal properties to different layers of the packaging structure. The external layer is designed with high heat resistance where thermal protection is needed, while the internal layer has lower melting properties where sealing is required. This localized optimization reduces overall thermal stress on the nonwoven fabric while maintaining manufacturing feasibility.
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 design enhances seal seam strength, reduces permeability, and enables reliable detection of defects, ensuring the sterility and integrity of the packaging, thereby eliminating the need for additional sterilization steps and improving the detection of sealing errors.
Implementation Method 1
the first web consists of a selectively permeable nonwoven fabric
Implementation Method 2
a laminated film with at least three layers, where the first layer is a polymer film arranged on the external side of the bag, the second layer is a lamination adhesive and the third layer is a polymer film arranged on the internal side of the bag
Implementation Method 3
bonded to one another
Data Source
AI summary
Packaging for the sterile storage and transport of objects for medical, pharmaceutical or cosmetic applications and a packaging process are provided. The packaging includes at least one bag made of a first and a second web, bonded to one another, a feature thereof being that the first web consists of a selectively permeable nonwoven fabric and that the second web consists of a laminated film with at least three layers, where the first layer is a polymer film arranged on the external side of the bag, the second layer is a lamination adhesive and the third layer is a polymer film arranged on the internal side of the bag. At least one of the layers of the second web includes one or more pigments. In an 8-bit greyscale image, the seal seam, imaged in transmitted light and contrast-standardized, is depicted within a greyscale value range of 50-200.