Sterilizable Multilayer Material Adhesive-Free Bonding
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Solution Overview
Problem
Current sterilization sheets cannot be permanently welded together due to differences in thermal fusion properties between cellulose sheets and thermofusible SMS-type sheets, requiring adhesives that increase costs, reduce sterilization stability, and pose contamination risks.
Innovation Solution
A multilayer material is created by sandwiching a non-thermofusible sheet between two thicknesses of thermofusible material, which are welded together across the non-thermofusible sheet, eliminating the need for adhesives and ensuring a strong, adhesive-free bond that meets microbial barrier and mechanical protection standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is used to bond cellulose sheet and thermofusible SMS sheet, then bonding strength is achieved, but sterilization stability decreases and contamination risk increases
Solution Approach 1:
The invention extracts and eliminates the adhesive component from the bonding system. Instead of using adhesive to bond the cellulose sheet and thermofusible SMS sheet, the patent employs direct thermal welding of the thermofusible sheet layers, removing the harmful adhesive substance entirely while maintaining bonding strength and improving sterilization stability.
Solution Approach 2:
The non-thermofusible cellulose sheet serves as an intermediary layer between the two thermofusible SMS sheet layers. This intermediary structure allows the outer thermofusible layers to be welded together directly, providing bonding strength while the cellulose intermediary maintains sterilization stability by being adhesive-free and sterilizable.
2Strength
If adhesive is used to bond sterilization sheets, then bonding is achieved, but additional packaging stage and cost are required
Solution Approach 1:
The invention merges the bonding function with the sterilization process itself. By making the outer layers thermofusible, the bonding operation is combined with the sterilization welding step, eliminating the need for separate adhesive application and curing stages, thereby reducing packaging process complexity and cost.
Solution Approach 2:
The invention extracts the adhesive application step from the packaging process. By using direct thermal welding of thermofusible materials instead of adhesive bonding, the complex multi-step adhesive application process is replaced with a single welding operation that occurs during sterilization.
3Ease of manufacture
If cellulose sheet and thermofusible SMS sheet are directly welded, then processing simplicity is achieved, but sufficient bonding forces cannot be produced due to different thermal fusion properties
Solution Approach 1:
The invention applies local quality by assigning different thermal properties to different layers: the outer layers are made thermofusible to enable welding and bonding, while the inner cellulose layer remains non-thermofusible to provide barrier properties. This local differentiation allows welding to occur at the thermofusible interfaces without requiring the entire structure to have uniform weldability.
Solution Approach 2:
The invention creates a composite multilayer structure combining thermofusible SMS materials with non-thermofusible cellulose materials. This composite construction allows each material to contribute its superior properties: thermofusible layers provide bondability and mechanical strength, while cellulose layers provide microbial barrier properties, achieving both welding simplicity and bonding strength.
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 solution allows for a strong, adhesive-free bond that maintains sterilization integrity and mechanical strength, reducing contamination risks and costs while meeting international standards for microbial barrier and sterilization compatibility.
Implementation Method 1
these thicknesses of thermofusible material being welded together across the non-thermofusible sheet
Implementation Method 2
allow the thermofusible material of the superimposed thicknesses to diffuse across the non-thermofusible sheet
Implementation Method 3
sufficiently porous to allow the passage of a sterilization gas
Data Source
AI summary
Sterilizable multilayer material (1), in particular for packaging at least one device for medical use, comprising a non-thermofusible sheet (2) sandwiched between two lower and upper thicknesses (3, 4) of thermofusible material of at least one thermofusible sheet (F), these thicknesses of thermofusible material being welded together across the non-thermofusible sheet.