Double-Dipped Nitrile Gloves for Snug Fit and Stress Retention
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Solution Overview
Problem
Existing elastomeric gloves face challenges in providing a snug fit without being restrictive and in adjusting stress retention for different applications, with current formulations and methods being costly and time-consuming to modify.
Innovation Solution
A double-dipped glove construction using two layers of nitrile butadiene rubber compositions, with varying amounts of metal oxides and cross-linking agents, including sulfur, to achieve stress retention of greater than 50% and adjust properties for specific applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-layer glove formulation is used, then manufacturing is simpler and cost-effective, but the glove cannot achieve both snug fit and desired stress retention for different applications
Solution Approach 1:
The glove is divided into two distinct layers with different formulations. The first layer (inner layer) contains a first nitrile butadiene rubber composition optimized for skin comfort and fit, while the second layer (outer layer) contains a second nitrile butadiene rubber composition optimized for stress retention and durability. This segmentation allows each layer to be independently formulated for its specific function, enabling the glove to achieve both snug fit and high stress retention without requiring complex multi-component systems.
Solution Approach 2:
The invention uses composite material construction by combining two different nitrile butadiene rubber formulations in a layered structure. The first composition and second composition have different ratios of polybutadiene, polysulfide, and other additives, creating a composite glove that exhibits superior overall performance compared to single-layer gloves. This composite approach allows optimization of each layer's properties for its intended function while maintaining manufacturing simplicity.
2Reliability
If glove formulation is changed to adjust stress retention for different applications, then performance is optimized, but manufacturing cost and time increase
Solution Approach 1:
The double-layer glove construction provides a universal solution that can serve multiple applications (medical, industrial, laboratory) without requiring formulation changes. By optimizing the thickness ratios and compositions of the two layers, the same basic glove structure can achieve different stress retention levels suitable for various applications, eliminating the need to develop and validate new formulations for each use case.
Solution Approach 2:
Instead of changing the chemical formulation for different applications, the invention achieves performance adjustment by changing physical parameters such as the thickness of each layer and the ratio of components within each layer's formulation. This allows flexible optimization of stress retention for different applications while maintaining the same manufacturing process and base formulations.
3Manufacturing precision
If a snug-fitting glove is designed, then hand protection is improved, but the glove becomes uncomfortably restrictive
Solution Approach 1:
The first layer (inner layer) is specifically formulated with different composition ratios compared to the second layer, creating local quality differences that optimize comfort where it matters most - against the skin. The first layer uses a formulation that provides softness and flexibility for comfort, while the second layer uses a formulation optimized for durability and stress retention, allowing the glove to be snug without being uncomfortably restrictive.
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 double-dipped glove design ensures a snug fit without being restrictive, with stress retention ranging from 50% to 70%, allowing for cost-effective and efficient adjustment of properties for different applications, such as medical and industrial use, while reducing defect rates and improving tensile strength and elongation.
Implementation Method 1
a first composition comprising a first nitrile butadiene rubber, a first metal oxide, and sulfur; applying a second composition to the first layer, wherein the second composition comprises a second nitrile butadiene rubber, a second metal oxide, and sulfur, thereby forming a second layer
Data Source
AI summary
A method of making a glove is described. The method comprises dipping a glove form into two different formulations. Each formulation comprises a carboxylated nitrile butadiene rubber with different amounts of covalent and ionic cross linkers. The gloves preferably have a stress retention value of greater than 50%.