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Method for evaluating polymer laser marking effect

A technology of laser marking and evaluation method, applied in the field of measurement, can solve the problems of large error and poor repeatability of results, and achieve the effect of objective and accurate evaluation and simple operation

Inactive Publication Date: 2013-12-18
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the needs of the market, people have gradually developed some laser marking functional polymers and their functional masterbatches over the years, but so far there is no objective and accurate evaluation of plastic laser marking in the published patent literature. The effect method, people often judge the quality of laser marking by visual observation, the subjectivity and individual differences of this method are obvious, the error is large, and the repeatability of the result is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The preparation and marking methods of materials in the following examples are as follows:

[0023] The raw materials are extruded, granulated and dried in a twin-screw extruder at 190-220°C, injected into standard color plates at 210-220°C, and then marked with a Tide Laser Nd-YAG marking machine (wavelength 1064nm) ) for laser marking, use the Ultra scan XE colorimeter to measure the change of lightness and darkness before and after marking the material △L, the change of color difference △E before and after the material marking, and calculate the absolute value of the difference |△E—△L |.

Embodiment 1

[0025] The raw material is polypropylene, black, the marking process parameters (current intensity 14A, frequency 1kHz, step size decreases from 1mm to 0.0005mm), the marking pattern is a square matrix, and the results are shown in Table 1:

[0026] Table 1 Marking evaluation effect under different step length conditions

[0027] step length(mm)

[0028] It can be seen from Example 1 that with the increase of the step size, △L, △E and |△E—△L| all show a decreasing trend, and the laser marking effect gradually becomes worse. When the step size increases to After 1mm, the color difference before and after the material cursor becomes less obvious, and the marking effect is relatively poor. Therefore, the actual laser marking process selection step size is ideal between 0.005-0.0005. The marking effect is ideal when △L is in the range of 2.5-5.0 and △E is in the range of 2.5-5.0.

Embodiment 2

[0030] The material is PA66, gray, the marking process parameters (the current intensity is increased from 0A to 20A, the frequency is 1kHz, the step size is 0.005mm), and the marking pattern is concentric circles. The results are shown in Table 2:

[0031] Table 2 Marking evaluation results under different current intensities

[0032] Current intensity (A)

[0033] It can be seen from Example 2 that with the increase of current intensity, △L, △E and |△E—△L| all showed a gradual increase trend, and when the current increased to 15A, △L increased to 4.1 , the color difference before and after the cursor of the material is obvious, and the marking effect is good. Therefore, it is ideal to choose the current intensity between 15 and 20A for the actual laser marking process. The marking effect is ideal when △L is in the range of 2.5-5.0 and △E is in the range of 2.5-5.0.

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Abstract

The invention belongs to the technical field of measurement and discloses a method for evaluating a polymer laser marking effect. According to the method for evaluating the polymer laser marking effect disclosed by the invention, an intensity change before and after a material is printed with a laser mark, a color difference change before and after the material is printed with the laser mark or an absolute value of a difference value of the intensity change and the color difference change are used as indexes. The evaluation method disclosed by the invention is simple, rapid and direct to operate and can be used for objectively and accurately evaluating the laser marking effect of a polymer material.

Description

technical field [0001] The invention belongs to the technical field of measurement, in particular to a method for evaluating polymer laser marking effects. Background technique [0002] Polymer resins are widely used in industries such as automobiles, home appliances, machinery and packaging because of their light weight, solvent resistance, easy processing, and easy recycling. In recent years, with the rapid development of various industries, the consumption of polymers has also shown a trend of increasing year by year. In practical applications, polymer products are often required to be marked on their surface to improve their recognizability and traceability. The traditional marking method mainly uses inkjet coding technology, but the marks obtained by this method are often easy to fade or disappear, and the use of ink will also cause pollution to the environment. [0003] In recent years, laser marking technology has been more and more widely used in the marking of pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
Inventor 陈锐罗忠富李永华李晟刘乐文钱永红吴博
Owner KINGFA SCI & TECH CO LTD
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