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Plastic capable of laser labelling, preparing process thereof and use

A laser marking, plastic technology, applied in the direction of replication/marking method, fibrous filler, temperature recording method, etc., can solve problems such as low contrast

Inactive Publication Date: 2002-07-24
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, dark markings are preferably produced using lasers on plastics most commonly found in the packaging sector, but in the case of transparent coloring, the contrast between the transparent plastic and the dark (light-absorbing) barcode lines is too small for successful scanner reading because Insufficient reflective plastic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] For laser marking, bottles made of transparent polyethylene were colored with Interference Yellow as pearlescent pigment and Iriodin(R) LS 825 as laser-sensitive pigment. The comparison used was a bottle made of transparent polyethylene colored only with Iriodin(R) LS 825. Barcodes produced by Nd:YAG lasers were easily readable on polyethylene bottles colored with pearlescent pigments, but not on polyethylene bottles without pearlescent pigments. But the barcode has the same shade of darkness on both bottles, and the perceptibility of the fill level of the clear colorless liquid in both bottles is about the same. The combination of pearlescent pigments and laser-sensitive pigments significantly increases the contrast between the barcode and the substrate, making the marking machine readable.

Embodiment 2

[0025] Polyethylene bottles colored by 0.4% fine-grain silver-white pearlescent pigment and 0.3% Iriodin® LS 810 using pulsed CO 2 Laser (masking process) marks the barcode. This barcode has almost 100% read reliability when reading devices with various scanners. None of the devices used could read the barcode on the control bottle containing only Iriodin(R) LS 810 without pearlescent pigment. The fill level and the perceptibility of the color of the colored liquid as well as the clear colorless liquid are the same for both bottles.

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PUM

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Abstract

The invention relates to a laser-markable transparent or translucent plastics which comprise pearlescent pigments in combination with laser-sensitive pigments which themselves do not exhibit any pearlescent effect. The pigment combination considerably improves the scanner legibility of applied laser markings. The invention also relates to a process for preparing the plastics, to the use of the plastics for producing moldings, to moldings produced in this way, and generally to the use of a mixture made from pearlescent pigment and laser-sensitive pigment in laser-markable plastics, for improving the scanner legibility of laser markings applied to the plastics.

Description

technical field [0001] The invention relates to laser-markable transparent plastics, the production and use of these plastics, moldings composed of these plastics, and the use of mixtures of pearlescent pigments and laser-sensitive pigments. Background technique [0002] Identification marking of products is becoming increasingly important in almost every branch of industry. For example, markings such as production dates, expiration dates, barcodes, company logos, serial numbers, etc. are often required. The demand for the amount of data to be communicated continues to grow, so this information is compressed into codes of increasing complexity, such as barcodes or data matrix codes. Most of these markings are currently accomplished using conventional techniques such as printing or labeling. But contactless and very rapid flexible marking with lasers is becoming increasingly important, especially for plastics. This technology is capable of producing graphics at high speed,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/00B41M5/26C08K3/00C08K3/013C08K9/02C08L101/12C09C1/00G06K7/00
CPCC09C2210/60C08K3/0033C08K9/02C08K2201/014C09C1/0081B41M5/267C09C1/0021C09C2200/1087C09C2200/1004C09C2200/102C08K3/013C08K3/00C01P2004/84
Inventor G·艾德勒
Owner MERCK PATENT GMBH
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