Laser-markable sheathing
First Claim
Patent Images
1. A communication cable having a sheathing, the sheathing comprising:
- a first layer of a first material containing a first proportion of a dye admixed with said first material, and bounding a core of said communication cable;
a second layer adjacent said first layer, said second layer forming an exterior surface having a marking face marked by irradiation with photons, and said second layer being formed of a second material and containing a second proportion of the dye smaller than said first proportion of dye which is admixed with the second material, said second proportion of dye associated with said second layer being selected to cause a color change upon irradiation with photons by melting an irradiated region, thereby forming a foamed CO2 region that scatters incident light.
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Abstract
The laser-markable sheathing comprises a carbon-blacked inner PE layer with a soot proportion of 2.5±0.5% by weight and an outer PE layer 0.05 to 0.2 mm thick. The outer PE layer completely absorbs the laser radiation (λ=532 nm) used for the marking, and the inner layer beneath it remains intact. A largely carbon-free, foamlike structure which greatly scatters incident light serves as an abrasion-proof marking. The sheathing is suitable for cable cores, fiber-optic cable strands, and the like.
31 Citations
20 Claims
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1. A communication cable having a sheathing, the sheathing comprising:
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a first layer of a first material containing a first proportion of a dye admixed with said first material, and bounding a core of said communication cable;
a second layer adjacent said first layer, said second layer forming an exterior surface having a marking face marked by irradiation with photons, and said second layer being formed of a second material and containing a second proportion of the dye smaller than said first proportion of dye which is admixed with the second material, said second proportion of dye associated with said second layer being selected to cause a color change upon irradiation with photons by melting an irradiated region, thereby forming a foamed CO2 region that scatters incident light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 20)
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13. A sheathing article, comprising:
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a sheathing separating an interior from an exterior, and having an exterior layer;
said exterior layer being transparent to a radiation used for marking said exterior layer, and containing a proportion of a dye selected from the group consisting of soot and graphite that is admixed with said sheathing; and
a plurality of predetermined characteristics of said exterior layer being selected from the group consisting of a thickness of the exterior layer and the proportion of said dye, the plurality of predetermined characteristics selected such that said exterior layer absorbs the radiation used for marking completely, and a color change results within an irradiated region upon irradiation by melting the irradiated region, thereby forming a foamed CO2 region that scatters incident light. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification