Section 10: Material Engraving Techniques
108
even if they are from the same manufacturer will have unique speed and power
settings. Use the guidelines in this manual as a starting point when determining the
correct speed and power settings. If you do not get acceptable initial results with the
recommended speed and power settings start experimenting by first changing only the
power setting. If adjusting the power setting does not work, start over and adjust only
the speed setting. Once you have acceptable results, record those settings for that
particular plastic so that you do not have to repeat the experimentation process.
Plastic Engraving Techniques
Always remove the clear protective cover layer before engraving.
Once you have the correct speed and power settings you can improve your engraving
results even more by taking the focus lens out of focus (lower the table) by about 1/16
of an inch. This technique enlarges the focus beam a little bit and provides more
beam overlap on each pass of the laser. The greater overlap produces a smoother
engraved surface on the plastic and eliminates the grooves that you sometimes see
when engraving plastic.
With some plastics it is best to engrave using two passes. The first pass cuts through
the cap layer and the second pass cleans away the residue that some plastics leave
behind.
Another technique that can be useful is to mask the plastic before engraving with
transfer or masking tape. This will prevent a buildup of residue on the plastic surface.
Misting the transfer tape with water will reduce heat buildup and melting on sensitive
plastics.
Plastic Vector Cutting Techniques
Use a Vector Grid to elevate the plastic before cutting. Air Assist will greatly reduce
flaming when cutting plastic.
Vectoring plastics is similar to vectoring other materials. First, experiment to
determine if the plastic can be cut with the laser. Plastics that are up to 1/16 inch
thick can usually be cut in a single pass. Thicker plastics may need two passes.
As with engraving, it is sometimes necessary to mask and dampen the plastic before
cutting. Even masking and wetting both front and backsides of the plastic is desirable
on sensitive plastics that have very low melting points.
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