Plenum Twisted Pair Cables Using Flame Retardant Polyolefin

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Solution Overview

Problem

Conventional communication cables face challenges in achieving high electrical and flame performance while meeting economic constraints, particularly in plenum spaces where fluoropolymers are expensive and in short supply, and alternative flame retardant polyolefin compounds offer worse electrical performance.

Innovation Solution

The use of flame retardant polyolefin insulation materials, such as polypropylene or polyethylene, in twisted pair communication cables, combined with specific twist lay configurations and overall twist directions, to reduce crosstalk and propagation delay, thereby meeting Category 6 or 6A cable standards.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If fluoropolymer insulation material is used, then electrical performance and fire performance are improved, but cost increases and supply availability decreases

Engineering Contradiction:

Improveelectrical performanceVSAvoidcost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive fluoropolymer insulation with cheaper flame retardant polyolefin insulation material. This substitution directly addresses the cost issue while maintaining plenum rating compliance, allowing manufacturers to produce cost-effective plenum-rated cables without relying on prohibitively expensive fluoropolymers like FEP

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent uses composite or modified polyolefin materials with flame retardant additives to achieve both cost-effectiveness and fire performance. By creating a composite material that combines polyolefin base with flame retardant compounds, the invention achieves plenum rating compliance at a lower cost than pure fluoropolymer while improving material availability

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If flame retardant polyolefin insulation is used, then cost is reduced, but electrical performance deteriorates

Engineering Contradiction:

ImprovecostVSAvoidelectrical performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent optimizes parameters of the flame retardant polyolefin insulation including thickness, composition ratios, and physical properties to achieve acceptable electrical performance. By carefully adjusting these parameters, the invention compensates for the inherently worse electrical characteristics of polyolefin compared to fluoropolymer, achieving Category 6 or 6A compliance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies different insulation thicknesses or compositions to different twisted pairs within the cable based on their specific electrical performance requirements. This localized optimization allows critical pairs to have enhanced insulation properties while less critical pairs use standard insulation, achieving overall cable performance targets while controlling material costs

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If flame retardant polyolefin insulation is used, then cost is reduced, but signal propagation delay increases

Engineering Contradiction:

ImprovecostVSAvoidsignal propagation delay

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The patent adjusts the insulation thickness and material composition parameters to control signal propagation velocity. By optimizing these parameters, the invention achieves acceptable propagation delay characteristics for Category 6 or 6A cables while using cost-effective flame retardant polyolefin material, balancing cost reduction with time delay requirements

Inventive Principle:

Principle #35Parameter changes

4Ease of manufacture

If conventional insulation materials are used, then cost is reduced, but fire performance deteriorates

Engineering Contradiction:

ImprovecostVSAvoidfire performance

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent creates composite polyolefin materials incorporating flame retardant additives and compounds. This composite approach maintains the cost-effectiveness and manufacturability of polyolefin while adding fire resistance properties to achieve plenum rating compliance, preventing the fire performance deterioration that would occur with conventional non-flame-retardant materials

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS9601233B1Plenum rated twisted pair communication cables

Publication Date: 2017.03.21 SUPERIOR ESSEX INT INC

AI summary

Plenum rated communication cables with reduced fluoropoloymer content may include a plurality of twisted pairs of individually insulated conductors, and each conductor may be insulated with a flame retardant polyolefin material. Additionally, each twisted pair may have a respective twist lay between approximately 0.30 inches and approximately 0.80 inches. The plurality of twisted pairs may be twisted together in a first direction and at least one of the plurality of twisted pairs may include conductors twisted together in a second direction opposite the first direction. A jacket may be formed around the plurality of twisted pairs.