Flame Polished Edges
Laser cutting acrylic is an art and a science. There are
many factors that will play a role in your ability to get the best possible
edge; both in the material as well as the laser cutting machine itself. For
example, the brand of acrylic and the type of acrylic can great impact the job.
Other factors of variance include laser parameters: power, frequency, and
speed; and laser process setup: table setup, focus, gas, exhaust, and material
preparation.
It's true that laser cutting acrylic can be very profitable,
but it is also quite difficult, especially if you are after the “flame polished
edge”. In this series of articles are several best practices and tips-of-trade
for processing acrylic on laser cutting machines, starting with choosing the
correct type of acrylic.
Choosing Your Acrylic
First, let's discuss brand and type of acrylic. The type of
acrylic can actually affect the edge quality. Extruded cuts better than cast;
however, it will not frost when engraved and can leave a burr on the edge of
the piece. So it's important to know the goals and priorities of the project
and customer. Cast acrylic will cut just as good as extruded, but will require
more intense power settings than extruded.
Types of Acrylic Masking
The masking of the acrylic also makes a difference in edge
quality. In the U.S.,
cast is almost always going to be paper mask. Extruded can be found as both
paper and film mask. The film mask is much easier to cut, and it doesn’t
require the top mask to be removed like cast. If the paper mask is not removed
off the top, it is very difficult to get a smooth edge. The paper mask that is
left on the top side is also very prone to flaming, which will ruin the piece
if the burning is bad enough.More to Come
Ensuring that you have chosen the correct type of acrylic is
step one in getting perfect results when laser cutting for flame polished
edges. Stay tuned for more tips on getting flame polished edges when laser
cutting acrylic.
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