Optimizing Braille Laser Engraving Parameters

The team also developed a set of parameters for laser printing of braille, which can be used with a reference chart to quickly adjust the laser power.It includes information on the relationship between different materials, the height of the Braille dots and the power setting, helping the operator to set the parameters precisely, thereby improving the efficiency and quality of the marking process.This is a reference book for engineers who design and produce Braille labels.

Why does laser power affect the effectiveness of Braille marking?

The power of the laser determines the depth and clarity of the raised dots.If the power is too low, the marks will be blurred and the texture will not be apparent; if it is too high, it may burn through the material or produce a rough edge.We had to get a feel for how different materials react to the heat during the testing process. For instance, acrylic, steel, and leather all have very different heat tolerances.

A table solves the problem of parameter matching.

The following table shows the results of tests by our team, and the general values we recommend (which should be adjusted for specific equipment):.

The type of material, and the range of the basic power.

Acrylic: 18-25W (thickness ≤ 3mm)

Stainless steel: 30-45W (must be combined with low frequency pulses).

8-12W (for rapid scan, to prevent carbonization) for parchment or card.

The height of the dots corresponds to the power of the lens.

For every 0.1mm increase in the height of the dot, the power of the laser is increased by 3-5 %.For example, if you want to mark a point 0.3mm deep on acrylic, you start with 20W, and the final power should be controlled around 20 × (1 + 0.03 × 3) = 21.8W.

A guide to avoiding pitfalls in the process of debugging.

First we try out a small sample, and then we go into mass production.

It is recommended that a 5 × 5 array of test points be made first to check for the following: (1) Whether the photoresist is properly exposed.

1) Are the distances between the dots even?

2. Is the edge prickly to touch?

3. Use your fingernail to scratch the paint to test adhesion.

Environmental factors should not be overlooked.

When the temperature in the workshop exceeds 30 ° C, the cooling efficiency of the laser falls, and the actual output power can be 5-8 % lower than the set value.At this point, the air conditioner is either turned on to cool things down, or the power is increased to the upper limit of the suggested range.

Tips for extending the life of your equipment.

Every 200 working hours, remember to do the following two things: (1) Clean the air filter.

1. Wipe the lens with a dust-free cloth moistened with alcohol.

2. Check the level and turbidity of the coolant.

Don't think it's a bother--attention to these details will make your laser head last for another six months!