Additives for laser marking of transparent plastics: an overview

Introduction

The use of additives for laser marking of transparent plastics is becoming increasingly important in industry. These additives play a decisive role in improving marking quality and material properties.

Principles of action of laser-active additives

Laser-active additives work by modifying the molecular structure of the plastic when it is exposed to a laser beam. This leads to a colour change within the material, which enables clear and permanent marking. The additives significantly increase contrast capability and contour sharpness.

Types of additives

• Colour pigments: These additives are specifically designed to enhance the visible marking.
• Stabilisers: They protect against the thermal effects of the laser and preserve the material structure.

Masterbatches and their influence

Masterbatches are concentrated mixtures that contain additives in a carrier plastic matrix. They are essential for the even distribution of the additives in the plastic. The right combination can optimise the markability and durability of the markings.

Influence on appearance and mechanics

• Appearance: The fine tuning of the additives ensures an aesthetically appealing and easily legible marking.
• Mechanics: Through the use of additives, the material strength can be preserved, which is particularly important for high-performance plastics.

Practical application in industry

For industrial applications, it is a decisive advantage that the markings are durable and unambiguous. The use of additives here results in an increase in efficiency and a reduction in production costs. Adapted masterbatches also enable a high degree of flexibility in material selection without compromising on quality.

Summary

The integration of laser-active additives and suitable masterbatches is a must for modern plastics engineering. They not only enable better marking, but also contribute to the optimisation of material properties. These technologies offer a clear advantage in the industrial production of plastic products.

Frequently asked questions

What advantages do laser-active additives offer in plastic marking?

Laser-active additives significantly increase the contrast and legibility of markings on plastics.

How do masterbatches influence laser marking?

Masterbatches ensure an even distribution of the additives and thus optimise the marking quality and material properties.

Which additives are frequently used for laser marking?

Frequently used additives are colour pigments and thermal stabilisers, which improve markability and material strength.

To what extent do additives increase the durability of markings?

Additives enable permanent marking by stabilising the molecular structure of the plastic upon laser exposure.

Are certain plastics better suited to laser marking?

Yes, plastics such as PC, PET and PMMA are particularly suitable for laser marking due to their reaction to additives.