Tracer Wire With Woven Polyester Strength Element

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Solution Overview

Problem

Existing tracer wire products for underground detection are complex to produce, lack strength, and do not provide precise dimensional control, limiting their applicability in detecting and locating underground cables and pipes.

Innovation Solution

A tracer wire product is manufactured using a flat polyester woven material and metal wire, where the polyester material is folded around the metal wire with a hot melt adhesive, and then coated with a polyethylene and HDPE jacket, forming a circular or oval shape with enhanced strength and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a prior art tracer cable structure is used, then detection function is provided, but manufacturing complexity increases and production becomes complicated

Engineering Contradiction:

Improvedetection functionVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The tracer cable is divided into distinct functional segments: a core element for detection, a strength member for mechanical support, and a protective covering. This segmentation allows each component to be optimized independently while simplifying the overall manufacturing process compared to integrated prior art designs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention extracts the essential detection function into a separate core element that can be independently manufactured and then assembled with the strength member and covering. This extraction simplifies manufacturing by allowing specialized components to be produced separately and combined, rather than creating a complex integrated structure.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If conventional tracer wire construction is used, then basic detection is possible, but strength and impact resistance are insufficient

Engineering Contradiction:

Improvedetection capabilityVSAvoidimpact resistance

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The tracer cable employs a composite structure combining a conductive core element with a high-strength polyester woven covering. This composite design provides both the electrical detection capability and the mechanical strength required to withstand impact and installation forces, resolving the contradiction between detection function and structural strength.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Different regions of the cable are assigned different properties: the core element provides electrical conductivity for detection, while the polyester woven covering provides mechanical strength and protection. This local differentiation of material properties allows the cable to simultaneously achieve detection capability and impact resistance.

Inventive Principle:

Principle #3Local quality

3Productivity

If standard manufacturing processes are used, then production is achievable, but dimensional control precision is insufficient

Engineering Contradiction:

Improveproduction feasibilityVSAvoiddimensional control

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The core element and strength member are prepared and positioned in advance before the final covering is applied. This preliminary arrangement allows for precise dimensional control of the internal structure, ensuring consistent cable geometry while maintaining efficient production throughput.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention replaces complex mechanical alignment systems with a self-positioning structure where the core element is naturally centered within the polyester covering through the forming process. This substitution simplifies the manufacturing mechanism while achieving superior dimensional control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 resulting tracer wire has superior strength, impact resistance, and precise dimensional control, enabling effective detection and location of underground cables and pipes with improved signal strength and abrasion resistance.

Implementation Method 1

an adhesive applicator for receiving the metal wire material and applying a hot melt adhesive to the metal wire material

Methodology Applied

Scientific EffectHot melt adhesive: Adhesive

Implementation Method 2

the means for providing a uniform cover including an extruder, with the guide tube extending into an extruder member

Methodology Applied

Scientific EffectExtrusion: Extrusion

Data Source

PatentUS10181365B2Tracer wire product and method of manufacture of the same

Publication Date: 2019.01.15 NEPTCO INC

AI summary

A tracer wire product for use in detection of underground utility line or routes includes: a metallic wire configured to conduct an electrical signal for detection by an aboveground signal detector; a tin coating formed over the metallic wire; a non-fibrous insulating jacket of polyethylene over the tin coating; a hot melt adhesive at least partially over the polyethylene jacket; a high tenacity woven polyester strength element with water blocking fibers being formed over the hot melt adhesive and the polyethylene jacket; and, an abrasion resistant HDPE outer jacket formed over the high tenacity woven polyester strength element to form one of a circular or oval cross-sectional shape.