Inspired by aggole who asked her printing house friend to laser engrave her Moleskine cover for a submission to the Invitation Au Voyage competition, also from many Powerbook laser engraving mods (such as this, this, this, this, this and this), I set out to ask my secondary school senior (who happen to own a laser machine for his USB memory labels on metal casings) for a series of tests on Moleskine.
I created an illustrator file and vectorized some of the images I like, made sure there were enough different types of lines and brush strokes to make comparisons. Along side with the file I gave a bunch of out dated 2007 diaries to my friend's production base and waited anxiously.
Various strengths and resolutions were tested. From 8% to 50% strength and 400dpi to 1200dpi. Basically the laser beam burned away the surface of the notebooks, in particular burn power can be specified to various brush strokes to simulate brush pressure effect. Anything below 10% on Moleskine cover creates brownish color patterns which looks like silk screen printing but the effect is too subtle. 15% strength creates much lighter brown color because the oilskin is already burned away, showing the hard paper cover beneath.
In terms of resolution, the higher is always better. However there is
no optimal laser power on Moleskine because the effect varies based on the graphic
design. i.e. in case of light fonts and thin strokes, less laser power, as long as it is higher than 15%, creates less depth and lighter color which brings out more of the
contrast between the font/strokes and the Moleskine black cover. In
case of bold fonts and large strokes or surface area of the design, it
is much more difficult to create an even color impression because paper
fibers are arranged less evenly than for example metal, thus density of
a surface area varies and burn color varies even though the entire area
is applied with the same laser strength.
50% strength creates best impression of the Scription logo and arial fonts. However, the temperature of the burn is too high for the oilskin therefore you see some of the burn marks in areas where the laser didn't touch.
It was a fun exercise really. Now that I know certain range of laser strength is good for certain type of design, I plan to create a limited edition notebook with the Scription logo and some nice patterns for some of our most loyal stationery customers. This will probably happen in 2008 after our crazy Xmas season and before our next round of world travel :)
Comments
Hi, Patrick
Wonder how long will it take for one little design.
I bought a cutting machine called CRAFT ROBO few months ago.
http://www.craftrobostore.com/us/
Not engraving but cutting out designs from Illustrators or any jpeg files. Billiant functions and handy size except the cutting time -- too long !! 15-20 mins for one full A4 design.
craig
Moleskine covers have PVC in them.
Here's the scoop on lasering moleskines:
Moleskine covers have PVC in them. PVC (aka Polyvinyl Chloride, aka vinyl) gives off chlorine gas when burned (lasered). However, when chlorine gas mixes with hydrogen (like in the air) it creates vaporized Hydrochloric acid. There is air in your laser (obviously), thus the reaction happens as soon as the material is lasered. It will be corrosive to the inside of your laser, especially the lens (since the lens is closest to the engraving surface).
There's a way to check for the PVC (chlorine) content of any material, check online for a cool video that goes into checking for chlorine for laser material.