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Antimony free composition for laser marking thermoplastic compounds

A thermoplastic polymer, marking technology, applied in the direction of iron compounds, bismuth compounds, replication/marking methods, etc., can solve the problems of complex and expensive manufacturing

Active Publication Date: 2019-10-15
CLARIANT PLASTICS & COATINGS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the manufacture of such compounds is complex and expensive

Method used

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  • Antimony free composition for laser marking thermoplastic compounds
  • Antimony free composition for laser marking thermoplastic compounds
  • Antimony free composition for laser marking thermoplastic compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In order to test the laser marking effect of different formulations, these injection molded panels thus equipped were applied to a laser marking system. For the experiments mentioned, a device from the company Trumpf with a Nd:YAG marking laser with a 20 W laser source (TruMark 3020) was used.

[0042] In order to visually observe the enhanced absorption of the thermoplastic compound, the panels are marked with a so-called "test grid". Along with this change the main laser marking parameters such as marking speed and pulse frequency. When the effect of these different parameters can be seen, the result is a matrix. This helps to find the best settings for the laser and shows the practicability of the system. The more parts of such a test grid exhibit good contrast, the less sensitive the system is to changes in laser settings. To demonstrate the applicability of this test, the bar was also lettered and numbered and barcoded with specific laser parameters, similar to ...

Embodiment 2

[0050] The different tests were measured by using a ColorLite sph900 device using the same method of making the test specimens as described above. Such devices are capable of measuring so-called K-values ​​(light contrast values). Like the δL* value, the result gives an indication of the quality of the mark, but also identifies light reflections. The lower the value, the better the marker contrast.

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Abstract

It has been found, that when co-absorbing substances are added to intrinsic laser- absorbing bismuthoxide, the marking performance with a Nd.YAG-laser is improved or at least kept at the same level byreducing the costs. It is suspected, that the co-absorbing additive is not simply adding a contrast to the polymer by carbonizing the surrounding polymer but helping the bismuthoxide to couple the laser radiation and to ease the color change of the additive. This so found effect helps to cheapen the replacement of antimony trioxide and therewith have a safer and more sustainable solution for thecurrent and future technology of laser marking.

Description

technical field [0001] The present invention relates to antimony-free laser-markable plastic compositions. Background technique [0002] In many plastic applications, marking of the final product manufactured is required. Whether it is food packaging, in which expiry dates or the producer must be indicated, or electronic components, in which a type description or serial number must be added. Today's consumers as well as industry demand transparency and traceability throughout the value chain, especially when sustainable sourcing and production is desired. [0003] When thermoplastics have to be marked, the preferred technology today is non-contact laser marking. In contrast to ink-based pad printing, laser marking is solvent-free and contact-free, giving excellent flexibility and speed. [0004] For laser marking, different types of materials and laser technologies are available. [0005] For laser marking of plastics, the Nd:YAG system with a frequency of 1064 nm is com...

Claims

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Application Information

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IPC IPC(8): C08K3/013C08K3/22C08K3/34B41M5/26A01K11/00
CPCC08K2003/321A01K11/00B41M5/267C08K3/22C08K3/32C08K3/346C08K2003/322C08K3/013C08L101/00C08L55/02C08L75/04B41M5/262C01G29/00C01G49/0018
Inventor J·沃尔夫C·Y·庞
Owner CLARIANT PLASTICS & COATINGS LTD
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