TPU Orthopedic Packaging Adhesion via EVA Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current packaging materials for sharp, abrasive orthopedic implants face challenges such as adhesion deficits between incompatible polymers, high manufacturing costs, and risks of the implant slipping and damaging the packaging, while also needing to maintain barrier properties and biocompatibility.
Innovation Solution
A composite film structure with improved adhesion between thermoplastic polyurethane (TPU) and other thermoforming materials, using a layer of heat-activated olefin-based polymer coupling agent containing ethylene-vinyl acetate (EVA) copolymer and polar co-monomers, which can be thermoformed into containers and trays for packaging sharp medical articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermoplastic polyurethane (TPU) is used for abrasion resistance and barrier properties, then durability and surface abrasion stability are improved, but adhesion to other packaging materials deteriorates
Solution Approach 1:
The patent introduces a primer layer as an intermediary substance between the TPU layer and other packaging materials. This primer layer contains adhesion promoters that chemically bond to both the TPU and the adjacent material, resolving the adhesion deficit without compromising the TPU's abrasion resistance or barrier properties.
Solution Approach 2:
The patent creates a composite structure combining TPU with other materials through controlled adhesion interfaces. By using a primer layer and adhesion promoters, the composite achieves both the durability/abrasion resistance of TPU and reliable bonding to other materials, enabling multi-layer packaging structures.
2Reliability
If multiple separate packaging components (PET-G blister with separate pouch) are used, then barrier properties and durability are improved, but manufacturing complexity and handling requirements increase
Solution Approach 1:
The patent merges multiple packaging functions into a single integrated multi-layer film structure. The TPU layer provides abrasion resistance and barrier properties, while adhesion promoters enable direct bonding to other materials, eliminating the need for separate pouches or blisters and reducing manufacturing complexity.
Solution Approach 2:
The TPU-based packaging material achieves multiple functions simultaneously: abrasion resistance, barrier properties, and adhesion to other materials. This multi-functional material replaces several separate components, simplifying both manufacturing and hospital handling while maintaining all necessary protective functions.
3Strength
If TPU is used for tensile strength and burst resistance, then durability across temperatures is improved, but adhesion to thermoforming materials deteriorates
Solution Approach 1:
The patent uses adhesion promoters and primer layers as intermediaries between the high-tensile-strength TPU material and thermoforming materials. These intermediaries provide chemical bonding interfaces that maintain the TPU's tensile strength and burst resistance while enabling reliable adhesion to thermoformed packaging structures.
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 enhances adhesion properties, reduces manufacturing costs, and provides durable, biocompatible packaging that effectively secures and protects orthopedic implants during handling and storage, while maintaining barrier properties against contaminants and moisture.
Implementation Method 1
a layer of heat-activated olefin-based polymer coupling agent containing ethylene-vinyl acetate (EVA) copolymer
Implementation Method 2
improved adhesion between thermoplastic polyurethane (TPU) and other thermoforming materials
Implementation Method 3
which can be thermoformed into containers and trays for packaging sharp medical articles
Data Source
AI summary
The present invention provides a packaging material comprising a first layer formed from a thermoplastic polyurethane (TPU) and a second layer formed from a heat-activated, olefin-based polymer coupling agent containing an ethylene-vinyl acetate (EVA) copolymer and a second polar co-monomer, wherein the packaging material has a total thickness of between 2 mil (50 μm) and 24 mil (600 μm), the first layer has a thickness of between 0.8 mil (20 μm) and 16 mil (400 μm), and the second layer has a thickness of between 0.8 mil (20 μm) and 8 mil (200 μm). The inventive packaging material may be used to provide thermoformed containers and trays for storing sharp, abrasive articles such as orthopedic devices including bone implants.