Cut Resistant Glove Liner Using Composite Yarn
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Solution Overview
Problem
Existing gloves used in petroleum oil-containing environments lack fire resistance, cut resistance, and electrical safety, failing to meet standards like CAN/CGSB-155.20-2000 for hydrocarbon flash fire protection, and often result in tool slippage and oil contamination that hinders wound healing.
Innovation Solution
A composite yarn with a fiberglass core ring spun with aramid staple fibers and wrapped with fire-resistant polyester and/or aramid yarns, which is knitted into a flexible liner and coated with polychloroprene latex to create a medium-weight glove that is cut resistant, fire resistant, and non-conductive, preventing electrical shorts and maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel fibers or metallic cut resistant fibers are used in the glove liner, then cut resistance is improved, but electrical circuit shorting occurs
Solution Approach 1:
The patent removes metallic fibers from the glove construction entirely, extracting the harmful electrical conductivity property while retaining cut resistance through non-conductive alternative materials such as high-performance polyethylene fibers and aramid fibers
Solution Approach 2:
The patent employs composite yarns combining non-conductive cut-resistant fibers (such as Spectra® or similar high-performance polyethylene) with fire-resistant fiber wrappings (such as polyester or aramid), creating a multi-functional material that provides cut resistance, fire resistance, and electrical non-conductivity simultaneously
2Ease of manufacture
If polycotton or nylon wrap fibers are used in cut resistant yarns, then ease of manufacture is improved, but fire resistance is lost as fibers readily catch fire
Solution Approach 1:
The patent uses composite yarns where the core provides cut resistance (from non-conductive fibers like high-performance polyethylene) and the wrapping provides fire resistance (from inherently flame-resistant fibers like polyester or aramid), eliminating the need for flammable polycotton or nylon wrappings
Solution Approach 2:
The patent changes the material parameters of the wrapping fibers from flammable materials (polycotton, nylon) to inherently fire-resistant materials (polyester, aramid) that meet CAN/CGSB-155.20-2000 standards, while maintaining the yarn construction process
3Strength
If extended chain polyethylene fibers (Spectra®) are used for cut resistance, then cut resistance is improved, but fire resistance is lost as the fibers are not flame retardant
Solution Approach 1:
The patent creates composite yarns where the core consists of non-conductive cut-resistant fibers (such as high-performance polyethylene) and the wrapping consists of inherently fire-resistant fibers (such as polyester or aramid), providing both cut resistance and fire resistance simultaneously
Solution Approach 2:
The patent designs the glove liner to perform multiple functions: cut resistance from the core fibers, fire resistance from the wrapping fibers, and electrical non-conductivity from the non-metallic composition, making the material universally suitable for petroleum industry applications
4Strength
If thick knitted liners are produced from wrapped cut resistant yarns, then cut resistance is improved, but flexibility is reduced
Solution Approach 1:
The patent uses thin-film polychloroprene latex coating applied to the knitted liner, creating a protective layer that maintains flexibility while providing additional protection, avoiding the need for thick rigid 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 provides a glove that meets the CAN/CGSB-155.20-2000 fire resistance standard, offers enhanced cut resistance, and prevents electrical shocks while maintaining flexibility and breathability, reducing the risk of injuries and oil contamination.
Implementation Method 1
The glove is dipped in latex and is durable, flexible, breathable and fire resistant
Implementation Method 2
resistant to swelling and degradation in the oily environment
Implementation Method 3
A composite yarn with a fiberglass core ring spun with aramid staple fibers and wrapped with fire-resistant polyester and/or aramid yarns, which is knitted into a flexible liner
Implementation Method 4
prevents electrical shorts and maintaining flexibility
Data Source
AI summary
A flexible cut resistant hydrocarbon flash fire resistant latex glove article is provided, having a flame resistant cut resistant liner and a flame resistant oil resistant polychloroprene polymeric latex coating. The knitted cut resistant fire resistant liner has is made from a composite yarn having a fiberglass core and optionally including a steel fiber. The core has a cushioning core sheath formed by ring-spinning of microdenier staple cut resistant fibers of, for example, para-aramid. and Staple modacrylic fibers can be included with the staple para-aramid fibers. Two wraps of continuous yarns of polyester, para-aramid, or both at a wrap density such that the wraps do not cover the core sheath in its entirety. In the absence of steel fiber, the cut resistant hydrocarbon flash fire resistant glove exhibits good electrical insulation characteristics even with sweat generated from hand preventing short circuit of electrical circuits. The glove is flexible due to the low denier of the composite yarn and is highly breathable especially when only the palm and fingers are coated with polychloroprene polymer.