TSB
screen printing => General Screen Printing => Topic started by: Ryan on April 11, 2013, 10:37:56 AM
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Because I'm an idiot, anyone that really knows want to explain some of the terminoligy and what it actually means in layman terms? with ink, short bodied, medium bodied etc. What it means for the ink, why you would want one vs another? What the elongation of a mesh actually determines? Anything else that you know and want to share??? Those just happen to be the 2 on my mind and I couldn't tell you why any of it makes any difference. Wonder how I've been in this business as long as I have :o
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short body, think Cool Whip... throw it on top a piece of pie, and it just sits there; after that, it gets thinner then actually runny (longer body). If on the mesh you mean low-elongation, once upon a time, mesh would lose it's tension just sitting there (still does but not as much) It stays tight because it's memory is trying to convert to slack. However, some meshes lose their memory, and therefore tension. (so, retensionable frames help solve this). Low-elongation mesh has a better memory, holds it's tension longer. That's my simple take on it anyway, hope it helps.
Steve
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long body is like taffy, you can pull it and it will not break as easily. Think stringy!
short body, as Steve pointed out, breaks when pulled.
that's the way I think of it. There is more to the story as the properties change under pressure, but that's the gist of it.
pierre
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also, it would be nice to have a terminology/dictionary available somewhere on the web site. Any takers on writing it up?
pierre
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From shop to shop region to region everyone is going to have some term they use, but it all points back to the same thing. I think that's why we all give different answers to the same question, but have the same results, to get some of the best terminology would be Scott Fresners book " how to print T-shirts for fun & Profit"...Collin on the boards here was in the ink biz I bet he is full of info on the terms of ink. The two guys that posted above I don't know about them jokers LOL gave you some good info, me I'm Learning from them.......
Darryl
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How about thixotropic?
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Or metamerism?
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How about thixotropic?
see post number three for not going into thixotropic! But feel free to explain for the sake of the dictionary collection.
pierre
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Or metamerism?
huh, have I had my behind kicked by it!
pierre
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or cross link. or bridging.
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Thixotropic is the poperty of an ink or gel to reduce viscosity when sheared. Metamerism is the property of colors to change hue when viewed under different light sources or surronded by different colors
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Hey wait a minute now Tony, if my white ink is "thixotropic" AND exhibits "dilatant flow", which term wins? :o
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Screen Foo
the terms are opposite of each other
Thixotropic is the false body of plastisols , think getting thicker by sitting and as it is stirred or sheared it becomes more creamy less viscos
Dilatant flow..is the opposite, its when ..the more you stir something and it gets thicker .. the more shear force
usually not a problem with Plastisol.
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So who is making the list? I feel like I just read through a science book and went.....uh I need to drop a level because there isn't any way i'm going to pass the test :'(
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http://en.wikipedia.org/wiki/Dilatant (http://en.wikipedia.org/wiki/Dilatant)
http://en.wikipedia.org/wiki/Thixotropic (http://en.wikipedia.org/wiki/Thixotropic)
http://en.wikipedia.org/wiki/Metamerism_(color) (http://en.wikipedia.org/wiki/Metamerism_(color))
not exactly laymans terms - unless you have studied the sciences.
maybe a wikipedia for screenprinters is needed - has anybody here created a wiki before?
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[url]http://en.wikipedia.org/wiki/Dilatant[/url] ([url]http://en.wikipedia.org/wiki/Dilatant[/url])
[url]http://en.wikipedia.org/wiki/Thixotropic[/url] ([url]http://en.wikipedia.org/wiki/Thixotropic[/url])
[url]http://en.wikipedia.org/wiki/Metamerism_(color)[/url] ([url]http://en.wikipedia.org/wiki/Metamerism_(color))[/url]
not exactly laymans terms - unless you have studied the sciences.
maybe a wikipedia for screenprinters is needed - has anybody here created a wiki before?
we can set up a wiki here, I am worried that it might end up being layman unfriendly by the time we put all these explanations in there. There are so many times I try to read something on the wikipedia and the explanation is soooo complex it makes it unreadable.
pierre
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Here is a link to the Glossary of Screen-Printing Terms from the FAQ Page on the Nazdar Ink Technologies website.
http://www.nazdar.com/faq.asp?sq17=1&q151=1 (http://www.nazdar.com/faq.asp?sq17=1&q151=1)
Many of the terms listed apply to graphic inks but it is a decent start.
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Attached is the Glossary Of Terms from the Nazdar SourceOne Textile Products catalog.
A copy of the complete catalog can be requested or downloaded at:
http://www.sourceoneonline.com/catalog_landing.asp?categoryID=4§ionID=238 (http://www.sourceoneonline.com/catalog_landing.asp?categoryID=4§ionID=238)
Hope that this information helps out some.
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Ryan, don't worry about it, you can't absorb it all at once; you have to have a problem crop up first, then this stuff starts to come into play, and you learn about it, solve that problem, and wait for the next one (it's coming...). So, take it as it comes, and ask your friends here.
Steve
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i learned a lot from this:
http://www.polyone.com/en-us/about/businessgroups/Inks/Literature/Wilflex_Manual04.pdf (http://www.polyone.com/en-us/about/businessgroups/Inks/Literature/Wilflex_Manual04.pdf)
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I don't know if you guys got to play with this stuff in physics class, but this is a great link on a material that is far more 'dilatant' than our inks: http://en.wikipedia.org/wiki/Non-Newtonian_fluid#Oobleck (http://en.wikipedia.org/wiki/Non-Newtonian_fluid#Oobleck)
I guess that's the thing though, dilatant and thixotropic aren't quite opposite--the white inks I've used that you had to print rather slowly to clear were exhibiting dilatant properties, but still had a false body that broke up, i.e. were thixotropic. Don't get me wrong, I don't know much about this stuff, but every bit I learn makes for less frustrating problems.
Wiki links are sweet, but I find myself having to read six other pages to understand the one I'm on.
I think a wiki would be a great way to organize resources for those getting started.