Knitted Covering for Penetration-Resistant Laminates

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Solution Overview

Problem

Penetration-resistant articles with laminates of fibers in a polymeric material face a high risk of projectile escape at the edge when fired at an angle, posing a risk of injury to the wearer and bystanders due to the smooth surface of the laminates.

Innovation Solution

A penetration-resistant article comprising a package of laminates with fibers of at least 2000 MPa strength, enclosed by a first protective cover and a second knitted or one-piece covering, which provides a complete enclosure to prevent edge exit of projectiles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If laminates with smooth surface are used for penetration resistance, then ballistic protection is improved, but projectile escape at edge increases

Engineering Contradiction:

Improveballistic protectionVSAvoidprojectile escape at edge

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The protective article is divided into two distinct functional layers: a laminate layer for primary ballistic protection and a separate knitted covering layer for edge containment. This segmentation allows each layer to specialize in its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The knitted covering acts as an intermediary element between the laminate and the external environment. It provides a transitional zone that captures and contains projectiles that escape from the laminate, preventing them from reaching the wearer or bystanders.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If high-strength fibers are used throughout the entire covering, then edge containment is improved, but weight and cost increase

Engineering Contradiction:

Improveedge containmentVSAvoidarticle weight

Core Design Contradiction:

Object-affected harmful factorsVSWeight of moving object

Solution Approach 1:

The knitted covering is constructed with spatial variation in fiber strength: high-strength fibers are concentrated in the edge regions where they are most needed for containing projectiles, while the central area uses lower-strength fibers. This local differentiation optimizes protection where required while minimizing unnecessary weight and cost.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If knitted covering is used for complete enclosure, then projectile containment is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveprojectile containmentVSAvoidmanufacturing complexity

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

A knitted fabric covering is used instead of rigid enclosures. The knitted structure provides flexibility and conformability while maintaining protective function, allowing the covering to be easily manufactured and integrated with the laminate without complex assembly procedures.

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentEP2324320B1Anti-penetration article

Publication Date: 2015.01.21 TEIJIN TWARON GMBH

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AI summary

The invention relates to a penetration resistant article, which comprises at least one package (6) of laminates (7) composed of least one layer, comprising fibers having a strength of at least 2000 MPA according to ASTM D-885. The laminates further comprise at least one polymer material, and the at least one package (6) is enclosed by a first separate protective cover and substantially completely by a second separate covering (1). The second separate covering is knitted or machine-knitted as one piece or multiple pieces.