Polyolefin Cable Jacketing for High-Contrast Laser Marking
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Solution Overview
Problem
Conventional printing techniques for communication cables, such as ink jet and embossing, are not suitable for fiber optic micro cables, and existing laser printing methods face challenges in achieving good contrast between dark carbon black filled cable jacketing and light markings, requiring additional manufacturing steps and lacking in-line mixing capabilities.
Innovation Solution
A polyolefin composition comprising a multimodal olefin copolymer, carbon black, and a UV agent, with specific density and melt flow rate properties, is used as the outer layer of a cable, enabling high-speed laser marking with excellent contrast and shrinkage properties without additional manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional printing techniques (ink jet, embossing) are used for fiber optic micro cables, then the printing process is simple, but the outer surface of micro cables is not sufficient for providing a print using conventional techniques
Solution Approach 1:
The patent replaces conventional mechanical printing methods (ink jet, embossing) with laser printing technology. The laser beam directly irradiates the cable surface to create permanent marks through thermal effects, eliminating the need for physical contact or liquid inks that fail on micro cable surfaces.
Solution Approach 2:
The patent modifies the cable jacketing composition by incorporating specific additives (carbon black in controlled amounts, laser printing additives, UV agents) to change its optical and thermal parameters. These compositional changes enable the surface to absorb laser energy effectively and produce high-contrast permanent marks.
2Productivity
If laser printing is used on dark carbon black filled cable jacketing, then high line speed and permanent marking are achieved, but good contrast between dark background and light marking is difficult to obtain
Solution Approach 1:
The patent carefully controls the concentration of carbon black (0.25-1.0 wt%) and introduces laser printing additives that modify the optical absorption characteristics of the jacketing material. This allows the dark background to remain dark while the laser-marked areas produce sufficient light contrast for readability.
Solution Approach 2:
The patent creates a composite cable jacketing material combining polyolefin base resin with specific amounts of carbon black, laser printing additives (such as metal oxides or organic compounds), and UV stabilizers. This composite structure enables simultaneous achievement of dark background color, high laser mark contrast, and durability.
3Manufacturing precision
If laser printing additives are added to achieve good laser print contrast, then print quality improves, but an additional manufacturing step for in-line mixing is required
Solution Approach 1:
The patent combines the laser printing additives with the base polyolefin resin during the initial compounding stage, creating a pre-mixed master batch. This integration allows the additives to be uniformly distributed throughout the jacketing material without requiring separate in-line mixing equipment or additional processing steps during cable production.
Solution Approach 2:
The patent performs the mixing of laser printing additives with the base resin in advance during compound preparation, before the actual cable extrusion process. This preliminary action ensures uniform distribution of additives and eliminates the need for complex in-line mixing systems during high-speed cable production.
4Object-affected harmful factors
If carbon black is increased to improve UV resistance, then UV protection improves, but laser print contrast deteriorates
Solution Approach 1:
The patent creates a multi-component composite system where carbon black (at controlled low levels of 0.25-1.0 wt%) provides UV protection, while laser printing additives (such as metal oxides like zinc oxide or titanium dioxide, or specific organic compounds) enhance laser mark contrast. The synergistic interaction between these components achieves both UV resistance and print visibility.
Solution Approach 2:
The patent optimizes the concentration parameters of different additives: maintaining carbon black at low levels (0.25-1.0 wt%) for UV protection while introducing laser printing additives at specific concentrations (0.1-5.0 wt%) to ensure sufficient laser mark contrast on the dark background.
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 polyolefin composition provides clear and distinct prints on cables with superior contrast and UV aging properties, eliminating the need for print enhancers and simplifying the production process while maintaining high physical properties like flexibility and Environmental Stress Crack Resistance.
Implementation Method 1
irradiating with a laser beam a polyolefin composition
Implementation Method 2
laser beam absorbent additive
Implementation Method 3
carbon black having an average secondary particle size of not smaller than 150 nm
Data Source
AI summary
A polyolefin composition for use as an outer layer of a cable is described, wherein the polyolefin composition comprises a multimodal olefin copolymer and carbon black and UV agent; wherein the multimodal olefin copolymer has density of 0.915-0.960 g/cm3, MFR2 of 0.1-10 g/10 min, wherein carbon black in the polyolefin composition is present in an amount of 0.25-1 wt %, and wherein the polyolefin composition has shrinkage of 1% or lower.