Spike Resistant Package With Slip Layer
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Solution Overview
Problem
Existing spike-resistant materials fail to effectively dissipate energy from spike threats due to restricted movement within pouches, leading to reduced penetration resistance when the static coefficient of friction between the pouch and textile layers is high, hindering the interaction and energy dissipation capabilities of the spike-resistant textile layers.
Innovation Solution
A spike-resistant package design incorporating a pouch with a slip layer having a low static coefficient of friction and a grouping of textile layers with high tenacity yarns or fibers, where at least a portion of the textile layers are coated with particles of 20 μm or less in diameter, allowing for effective energy dissipation and penetration resistance against spike threats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the static coefficient of friction between the pouch and textile layers is high, then the textile layers are held firmly in place, but the textile layers cannot move freely to dissipate energy from spike threats
Solution Approach 1:
The system is segmented into three functional components: the pouch (providing containment), the textile layers (providing spike resistance), and the slip layer (providing controlled movement). This segmentation allows each component to fulfill its specific function without compromising the others, resolving the contradiction between stability and energy dissipation.
Solution Approach 2:
The slip layer acts as an intermediary between the pouch and the textile layers. It has low friction characteristics that allow the textile layers to move freely and dissipate energy when struck by a spike, while still maintaining positional stability during normal wear. This intermediary layer resolves the contradiction by providing controlled movement without sacrificing containment.
2Strength
If heavy duty materials are used to improve spike resistance, then penetration resistance increases, but the weight of the protective article increases
Solution Approach 1:
The invention uses composite materials consisting of multiple textile layers with specific fiber compositions (such as ultra-high molecular weight polyethylene, aramid, or polypropylene) combined with a slip layer and pouch. This composite structure achieves high spike penetration resistance through the synergistic interaction of layers, allowing each layer to contribute its specific properties rather than relying on a single heavy material.
Solution Approach 2:
The invention changes key parameters of the textile layers, specifically using fibers with tenacity of at least 10 grams per denier and controlling the weight percentage of coating materials to be 10 wt% or less. These parameter optimizations allow the material to achieve high strength-to-weight ratio, providing spike resistance without excessive weight.
3Loss of energy
If the textile layers are allowed to move freely within the pouch, then energy dissipation improves, but the layers may shift position and reduce protection effectiveness
Solution Approach 1:
The system is designed to be dynamic rather than static. The textile layers are permitted to move dynamically in response to spike impacts to maximize energy dissipation, while the pouch and slip layer provide the necessary constraints to maintain positional stability during normal conditions. This dynamic design resolves the contradiction by allowing movement only when needed for protection.
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 package achieves enhanced spike penetration resistance by enabling the spike-resistant textile layers to interact freely with spikes, effectively dissipating energy and meeting or exceeding Level 1 Spike class threats as per NIJ Standard 0115.00, with potential for higher level threats with optimized layer configurations.
Implementation Method 1
The slip layer has a stiffness of less than about 0.01 N-m and a static coefficient of friction (COF) between the slip layer and the second side of the first grouping of less than about 0.40
Implementation Method 2
Each of the textile layers within the first grouping of textile layers contains a plurality of interwoven yarns or fibers having a tenacity of about 5 or more grams per denier
Implementation Method 3
At least a portion of the spike resistant textile layers comprise about 10 wt. % or less, based on the total weight of the spike resistant textile layer, of a coating comprising a plurality of particles having a diameter of about 20 μm or less
Data Source
AI summary
A spike resistant package containing a pouch, a first grouping of spike resistant textile layers, and a slip layer. Each of the textile layers within the first grouping of textile layers contains a plurality of interwoven yarns or fibers having a tenacity of about 14 or more grams per denier. The slip layer has a thickness of less than about 0.1 mm, a stiffness of less than about 0.01 N-m, and a static coefficient of friction (COF) between the slip layer and the second side of the first grouping of less than about 0.40. The pouch essentially fully encapsulates the grouping of spike resistant textile layers and the slip layer and the slip layer and the inner surface of the pouch are in direct and intimate contact. An article containing the package is also described.