Printable Aramid Blend Fabric for Combat Uniforms
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Solution Overview
Problem
Aramid fibers used in flame retardant textiles do not accept ink or pigment well, leading to abrasion and fading, which compromises camouflage effectiveness by making the wearer more visible due to a whitish tint, especially under harsh conditions.
Innovation Solution
A fabric structure featuring a warp system with aramid fibers and a weft system of core spun yarns, where the core is made of mechanically resistant fibers and the sheath of non-thermoplastic materials, providing excellent mechanical, flame resistance, and printability properties, with a high coverage of the warp system by the weft system, ensuring thermal protection and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If aramid fibers are used for flame retardant protection, then thermal protection is improved, but printability and color fastness deteriorate due to ink/pigment abrasion
Solution Approach 1:
The patent uses a composite yarn structure combining aramid fibers (for flame resistance) with polyester fibers (for printability and color fastness). The polyester component forms the outer surface that accepts dyes and resists abrasion, while the aramid core provides thermal protection. This composite approach resolves the contradiction by integrating materials with complementary properties.
Solution Approach 2:
The patent applies different material properties to different parts of the fabric structure. The outer surface layer ( polyester sheath) is optimized for printability and abrasion resistance, while the inner core (aramid) is optimized for thermal protection. This local differentiation allows each component to excel at its specific function without compromising the other.
2Temperature
If aramid fibers are used for flame retardant protection, then thermal protection is improved, but camouflage effectiveness deteriorates due to whitish tint from ink abrasion
Solution Approach 1:
The composite yarn structure with polyester outer layer protects the aramid core from direct exposure and abrasion. The polyester sheath maintains the printed camouflage pattern by resisting ink loss, while the aramid core remains protected and does not contribute to the surface appearance. This prevents the whitish tint that would compromise camouflage.
Solution Approach 2:
The polyester fiber sheath acts as an intermediary layer between the external environment (friction, washing, printing) and the aramid core. It absorbs the mechanical stress and protects the aramid fibers from direct contact with abrasive forces that would cause ink loss and reveal the white fiber surface.
3Ease of manufacture
If cotton-polyester-nylon blend is used for combat uniform, then printability and camouflage are improved, but flame retardant protection deteriorates
Solution Approach 1:
The patent replaces the traditional cotton-polyester-nylon blend with a core-spun composite yarn containing aramid and polyester fibers. This substitution maintains the printability advantages of polyester while adding the flame retardant properties of aramid, eliminating the need for heavy cotton content that compromises thermal protection.
Solution Approach 2:
The patent fundamentally changes the fiber composition parameters of the fabric by introducing aramid fibers and adjusting the polyester content to optimize both flame resistance and printability. This parameter change transforms the fabric from a conventional combustible material to a flame-retardant composite while preserving manufacturing and printing capabilities.
Data Source
AI summary
The present invention relates to a fabric comprising a warp system and a weft system. The warp system comprises at least one flame retardant yarn comprising aramid fibers and the weft system comprises at least one core spun yarn. The flame retardant yarn of the warp system is covered by at least 70 % of the weft system. The fabric according to the present invention has an ink receptive surface and a thermal protection surface, and has particularly excellent mechanical, flame resistance and printability properties due to the structure of its weft and warp systems and the materials used and is particularly useful in confection of combat uniforms. Furthermore, the fabric according to the present invention is also exceptionally abrasion resistant, which prevents the fading of a printed image thereon.