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screen printing => Screen Making => Topic started by: BRGtshirts on October 02, 2019, 02:40:11 PM
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Background: our shop switched to getting 5 gal. containers of emulsion about 6 months ago. We'll pour from the 5 gallon into one or two 1 gallon buckets at a time (daily use is anywhere from 1-2 gallons of emulsion per day). We open the spout and then put a single hole on the opposite side of lid with a phillips screwdriver for air (so it pours easier) and keep the lid on it when not in use. We also cover the air hole with a piece of tape.
We reuse the 1 gallon buckets after each fill. We wash them out and remove all old emulsion. They dry and then are refilled and a lid is put on them.
So... the issue is: We've been seeing bits of debris (sometimes what looks like black specs) in the emulsion in the 1 gallon buckets after they have sat overnight. Whatever this stuff is, is causing pinholes and/or rashes in the screens that we see on press. We can't trace if it's coming from the 5 gallon bucket itself or from the 1 gallon buckets.
We did not have this issue when we bought our emulsion in 1 gallon buckets. Only once we started buying the 5 gallon and transferring. Any ideas?!
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Background: our shop switched to getting 5 gal. containers of emulsion about 6 months ago. We'll pour from the 5 gallon into one or two 1 gallon buckets at a time (daily use is anywhere from 1-2 gallons of emulsion per day). We open the spout and then put a single hole on the opposite side of lid with a phillips screwdriver for air (so it pours easier) and keep the lid on it when not in use. We also cover the air hole with a piece of tape.
We reuse the 1 gallon buckets after each fill. We wash them out and remove all old emulsion. They dry and then are refilled and a lid is put on them.
So... the issue is: We've been seeing bits of debris (sometimes what looks like black specs) in the emulsion in the 1 gallon buckets after they have sat overnight. Whatever this stuff is, is causing pinholes and/or rashes in the screens that we see on press. We can't trace if it's coming from the 5 gallon bucket itself or from the 1 gallon buckets.
We did not have this issue when we bought our emulsion in 1 gallon buckets. Only once we started buying the 5 gallon and transferring. Any ideas?!
first thought would be shavings from the screwdriver hole. I would try skipping the hole and see what happens.
It would not hurt to take a picture or two of the bits so we can see. . .
pierre
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Not sure what is causing the problem you are having but I just might have a solution to keep it from happening... Since you are pouring the 5 into single gallon containers why not just purchase 1 gallon containers 5 at a time from your supplier. I did this with my white ink and the help is a lot happier. Sounds like you are buying a lot of emulsion so your supplier should have no problem matching the 5 gallon bucket price with 5 single gallons. If they don't I'll bet someone else will. Good luck...
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I would get a piece of 25 mesh or some window screen and put over the spout or cover your bucket and strain the emulsion through that and see what is left on the screen....I'm sure the emulsion will pour through the mesh. I've seen shavings before in my emulsion and I think I cause it by stirring it up with a metal spatula, most likely scratching the sides or bottom of the can.
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I would get a piece of 25 mesh or some window screen and put over the spout or cover your bucket and strain the emulsion through that and see what is left on the screen....I'm sure the emulsion will pour through the mesh. I've seen shavings before in my emulsion and I think I cause it by stirring it up with a metal spatula, most likely scratching the sides or bottom of the can.
Thanks everyone for the posts. I think I'll probably pursue this (have them match the 5 gal price on 5 single gallons..). Could be a real easy fix.
Thanks,
Will
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Darryl is on to something. We use wood paint sticks here. We also use single gallons and not 5ers. We found the same thing, it's much easier to use a single gallon than to scoop ink or emulsion out into singles as needed.
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yes, singles are easier, but... if there is room to sell singles at 5 price, there should be room to buy 5's at a discount if buying 5 of them. For somebody using a gallon a day this should not be too much.
pierre
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I agree 1 gals are much easier to handle, I stopped buying 5er,s in ink long time ago just to much to handle and to much space it takes up
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Check out this video regarding how we solve this problem, the air hole is created by simply taking a pair of scissors and creating the hole by plunging them through the lid, very simple.
https://www.youtube.com/watch?v=fx4uITEDtGE (https://www.youtube.com/watch?v=fx4uITEDtGE)
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Check out this video regarding how we solve this problem, the air hole is created by simply taking a pair of scissors and creating the hole by plunging them through the lid, very simple.
https://www.youtube.com/watch?v=fx4uITEDtGE (https://www.youtube.com/watch?v=fx4uITEDtGE)
So for going off topic here but I noticed you use a Vastex semi auto coater in your screen making department. Are you guys happy having made that purchase? I consider getting one for our shop and was hoping to get some feedback of actual users.
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2 different videos on the Vastex Auto coater here
https://www.youtube.com/channel/UCt5q49F42EKjr_3huNX5Czg (https://www.youtube.com/channel/UCt5q49F42EKjr_3huNX5Czg)
We find it gives us a very consistent coating, slower than most people can coast manually but much more consistent, in my opinion a good investment.
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2 different videos on the Vastex Auto coater here
https://www.youtube.com/channel/UCt5q49F42EKjr_3huNX5Czg (https://www.youtube.com/channel/UCt5q49F42EKjr_3huNX5Czg)
We find it gives us a very consistent coating, slower than most people can coast manually but much more consistent, in my opinion a good investment.
Greg, I didn't see the videos there...
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scroll right on the videos.
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Wow...I swear I know how to use the interwebs.
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2 different videos on the Vastex Auto coater here
https://www.youtube.com/channel/UCt5q49F42EKjr_3huNX5Czg (https://www.youtube.com/channel/UCt5q49F42EKjr_3huNX5Czg)
We find it gives us a very consistent coating, slower than most people can coast manually but much more consistent, in my opinion a good investment.
Placed my order for the semi auto coater last night + the big Vastex screen drying cabinet.
Thanks for the feedback.
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Check out this video regarding how we solve this problem, the air hole is created by simply taking a pair of scissors and creating the hole by plunging them through the lid, very simple.
https://www.youtube.com/watch?v=fx4uITEDtGE (https://www.youtube.com/watch?v=fx4uITEDtGE)
Greg, thanks. We got the idea for the air hole from your video a while back haha, so thanks for that. I don't think the debris is from the hole I think it's coming from somewhere else...
The 5's have been working great other than the mystery debris, and as Pierre mentioned we could up to five 5-gallons at a time.. so could get back on the savings bandwagon there.
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I assume you are not forcing the hole into the lid while it sits on the pail, right?
We never had debris in our emulsion apart from last year which turned out to be some sort of an insect. And for stirring the emulsion we use plastic spatulas.