"He who marches out of step hears another drum." ~ Ken Kesey
Do you suspect there would be a perfect temp, or a range of say 5° to 10° on either side of a perfect temp?Steve
From what I recall, all ink is 'tested' in the lab at 70 degrees
Quote from: jsheridan on April 25, 2014, 09:37:50 AMFrom what I recall, all ink is 'tested' in the lab at 70 degreesis your ink 70 degrees when you print with it?pierre
Quote from: blue moon on April 25, 2014, 09:39:14 AMQuote from: jsheridan on April 25, 2014, 09:37:50 AMFrom what I recall, all ink is 'tested' in the lab at 70 degreesis your ink 70 degrees when you print with it?pierreI live in CA.. it's 72 and sunny 8 months out of the year.
My white ink was 88 degrees yesterday when I was test printing a design through a 180/48. I was printing at 30"/sec with 35 psi. I will be doing more testing today and I'll do it earlier with cooler ink and I'll let you guys know what type of results I get. I have about a dozen prints that I've been examining and I can't believe the difference between the prints with 4"/sec and 30"/sec, it's worth it to print fast. The 15"/sec prints looked good too, but not quite as smooth as the 30'.I know most people know this but for those guys who haven't heard it mentioned, print white as fast as you can possibly do it. That goes for every plastisol color as well really, but obviously white is the most important one to focus on in most shops.
Why are you guys still messing around with plastisol
I will throw in my $0.02 here. Plastisol viscosity will certainly vary with temperature. White inks even more so with all the eye of newt and bat wing additives. An increased viscosity due to cold -s a "false" body. That is, adding shear (temperature) will bring it back. Increased viscosity due to higher heat is irreversible -- the pvc resin has begun to swell and absorb the plasticizer. Generally speaking, the thinnest the ink will be is around 100-110F. Ymmv. Take a look at this rather crude viscosity chart. Please do not take the numbers as absolutes - they are not. Merely presented to give a visual image as to what happens when plastiso lis exposed to heat. The high end 350+ is a remelt.