Additive for YAG laser marking

一种激光标记、添加剂的技术，应用在激光焊接设备、复制/标记方法、温度记录法等方向，能够解决不能不起作用等问题

Inactive Publication Date: 2006-09-06
ENGELHARD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, materials originally developed for carbon dioxide lasers often don't work well (or even work at all) with the increasingly popular neodymium-doped yttrium aluminum garnet (YAG) lasers, which require the material to absorb at 1064nm.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1165

[0017] Example 116.5% Sb 2 o 3 sample preparation

[0018] Dissolve 38.2g of antimony oxide in 150ml of concentrated hydrochloric acid. The resulting solution was cloudy. The cloudy solution was then added to 150ml of water and 590ml of 76.5% SnCl 4 ·5H 2 O middle. The resulting antimony-tin solution was added to 500 ml of water maintained at 75°C, pH = 1.6. To this solution was added 35% sodium hydroxide solution at 4.5 g / min to maintain its pH at 1.6. The reaction mixture was filtered to obtain an orange filter cake. It was calcined at 650° C. for 2 hours to obtain a medium gray free flowing powder, which was then ground to a particle size of 0.5 μm.

Embodiment 2

[0019] Example 2 Labeling with the product of Example 1

[0020] Addition of 0.1 wt% co-precipitated mixed tin oxide and antimony oxide calcined powder and 0.5% TiO to polypropylene 2 , and disperse it therein, and inject it into a tablet. Unmarked slabs have an appearance of L * =82.0,a * =-1.5,b * = 1.1. A YAG laser beam was applied on the obtained flat plate with a current of 14 amps, a pulse frequency of 6 kHz, a scan rate of 300 mm / s, and an aperture of 0.05. It was found that a clear line with a width of about 0.1 mm was obtained. This is due to the laser marking additive absorbing the YAG laser energy and converting the laser energy into heat which carbonizes the surrounding polymer material, thus producing a black or dark mark relative to the surrounding area.

Embodiment 3

[0021] Embodiment 3 Preparation of tin oxide powder

[0022] A beaker containing 500 ml of water was heated to 75°C and the pH was adjusted to 1.6. 578g of 78.1% SnCl 4 ·5H 2 O solution was added to the beaker at 4.5 g / min, while NaOH was needed to maintain pH=1.6. After the addition was complete, the slurry was filtered and the particles were rinsed 4 times with 500 ml of water each time. The filter cake was dried at 120°C for 1 hour, after which it was calcined at 650°C for 30 min. The calcined product is off-white.

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PUM

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Abstract

A calcined powder of co-precipitated mixed oxides of tin and antimony is used as a YAG laser marking additive. The additive is designed to impart little to no color to the plastic in which it is incorporated but to provide a high contrast dark marking after being exposed to a YAG laser.

Description

[0001] This application is a divisional application filed in accordance with Article 42 of the Implementing Regulations of the Patent Law. The original application is the application number 02809475.1 and the title "Additives for YAG Laser Marking" filed on April 1, 2002. technical field [0002] The present invention relates to additives for YAG laser marking. Background of the invention [0003] A number of printing techniques, including screen printing and transfer printing, are well known for imprinting indicia on objects. These are generally surface printing methods, which means that the resulting identification marks become illegible due to mechanical damage, friction, chemical effects and the like. This printing method is difficult to apply to curved or textured surfaces, and the special processing costs required add to the overall cost of the product. [0004] The benefits of using laser systems to mark objects are also well known. Laser technology has advanced so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G30/00C01G19/02B41M5/26C01G30/02B23K26/00C08K3/22C09C1/00
CPCC01P2004/82C08K3/22C01G30/004C01P2006/20C01G30/00B41M5/267C01P2004/62C01P2006/60C01P2004/61
Inventor J·B·小卡罗尔S·A·琼斯
Owner ENGELHARD CORP
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