Multilayer Surgical Drape With Tie Layer Bonding
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Solution Overview
Problem
Current surgical drapes face challenges in being strong, fluid-impermeable, and soft while incorporating renewable materials, with difficulties in bonding hydrophilic absorbent layers with polyolefin barrier layers, especially in humid environments.
Innovation Solution
A multilayer article comprising a hydrophilic absorbent layer made from aliphatic polyester fibers combined with surfactants, a polyolefin barrier layer, and a tie layer with high polar monomer content to enhance bonding between the absorbent and barrier layers, using a copolymer of olefin and polar monomers, reactive groups, and tackifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a hydrophilic absorbent layer is bonded directly to a polyolefin barrier layer, then the structure is simple, but the adhesion is poor especially in humid environments
Solution Approach 1:
A tie layer comprising a copolymer of olefin and polar monomers is introduced between the hydrophilic absorbent layer and the polyolefin barrier layer. This intermediary layer provides compatible bonding interfaces with both layers, with the olefin portion bonding to the polyolefin barrier layer and the polar monomer portion bonding to the hydrophilic absorbent layer, thereby resolving the adhesion problem while maintaining a relatively simple three-layer structure.
2Adaptability or versatility
If renewable materials like aliphatic polyester are used in the absorbent layer, then environmental sustainability is improved, but bonding compatibility with polyolefin barrier layer deteriorates
Solution Approach 1:
The tie layer is formulated as a composite material containing a copolymer of olefin and polar monomers, along with reactive polymers having hydroxyl-reactive groups and tackifiers. This composite composition enables the tie layer to simultaneously bond with both the renewable aliphatic polyester absorbent layer and the conventional polyolefin barrier layer, facilitating the use of sustainable materials while maintaining reliable interlayer adhesion.
3Quantity of substance
If the absorbent layer is made highly hydrophilic with surfactants, then absorbency is improved, but bonding to polyolefin barrier layer deteriorates
Solution Approach 1:
The tie layer acts as a mediator that bridges the highly hydrophilic absorbent layer and the hydrophobic polyolefin barrier layer. The copolymer structure with both olefin and polar monomer components, combined with reactive groups and tackifiers, enables effective bonding to both extremes of hydrophilicity, allowing the absorbent layer to maintain high surfactant content for optimal absorbency without compromising interlayer adhesion.
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 results in a durable, soft, and fluid-impermeable drape with improved adhesion between layers, maintaining strength and absorbency even in moist conditions, while increasing the use of renewable materials and reducing production costs.
Implementation Method 1
a tie layer bonding the absorbent layer to the barrier layer
Implementation Method 2
the reactive monomer comprises a reactive group that covalently reacts with a hydroxyl group
Implementation Method 3
a nonwoven web of fibers comprising an aliphatic polyester combined with a surfactant
Data Source
AI summary
Multilayer articles having an absorbent nonwoven layer and a barrier layer are described, including those having a surfactant-treated, aliphatic polyester, nonwoven absorbent layer and a barrier layer. Multilayer articles including a tie layer used to enhance the bond between the hydrophilic absorbent layer and the barrier layer are also described. Methods of making and using such articles are also described.