Emulsion drying, does drying print side down matter? - T-Shirt Forums
 

Hi, Unregistered. | Today's Posts

T-Shirt Forums
User Name
Password

Register Today For Free!

Forgot Your Password?





Site Navigation








+   T-Shirt Forums > T-Shirt Industry Information > Screen Printing


Screen Printing Category Sponsor

Discuss the various aspects of screen printing. Inks, speciality printing, print locations, durability, etc.



Emulsion drying, does drying print side down matter?

Like Tree2Likes
  • 2 Post By TABOB

 
Share This Thread Thread Tools
Old 4 Weeks Ago Oct 15, 2019 1:46:27 PM -   #1 (permalink)
Forum Member
T-Shirt Apprentice

oceangraphix's Avatar
 
Member Since: Jan 2018
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Thanks: 0
Thanked 0 Times in 0 Posts


Default Emulsion drying, does drying print side down matter?

I just got a machine that I will try to use for drying my screens. It is a medical warming cabinet for towels/blankets. Temp can go from 90 to 160. It does not have a dehumidifier. Was gonna use dessicant bags for moisture removal, but could put a small dehumidifier in unit if needed.
Everywhere I read, it says to dry the screen emulsion with print side down. Why is that so? If I can dry with print side up, I won't have to make blocks to raise the screen above the shelves that have holes for air circulation. Shelves already have cutouts on left and right sides to allow air to circulate from top to bottom. Fans on bottom blow up left side, and pull down right side giving good circulation and moving the heat around from the ceramic heat element on the bottom of the cabinet. The fans blow a good amount of air, and the heat is digitally controlled to 1 degree.
Can anybody tell me why to dry the screens facing down, and if dessicant bags will do the trick? I was going to put about 8 1/2lb bags in there, that should be more than adequate.
 
Sponsored Links
Advertisement
 
Old 4 Weeks Ago Oct 15, 2019 3:15:46 PM -   #2 (permalink)
Senior Member
T-Shirt Mogul


TABOB's Avatar
 
You can call me: Bob
Member Since: Feb 2018
Location: UK
Posts: 1,071
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Thanks: 1
Thanked 132 Times in 126 Posts


Default Re: Emulsion drying, does drying print side down matter?

Obviously you've never done a screen... Otherwise you'd know.
Unless you have some anti-gravity machine, dry your screens print side down.
NoXid and Amw like this.
 
Old 4 Weeks Ago Oct 15, 2019 6:18:44 PM -   #3 (permalink)
Senior Member
Certified T-Shirt Junkie


NoXid's Avatar
 
Member Since: Apr 2011
Location: Portland OR USA
Posts: 3,008
Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Thanks: 150
Thanked 545 Times in 519 Posts


Default Re: Emulsion drying, does drying print side down matter?

As @TABOB said, you want the print side down. Emulsion is a liquid. Screens are a mesh/weave. The emulsion will run or seep whatever direction gravity pulls. We want the thickest part of the emulsion on the print side, thus we must place the print side down, and it must be more or less level.

You need somewhere for the moisture to go. Desiccant might accomplish that, but you either need to replace it or there is the kind you can heat to a high temp to recover ... either seems like a bother and ongoing expense compared to introducing warm air and extracting moist air, or using a dehumidifier.

My dry box has light-baffled vents at the top and takes in air from an external dehumidifier at the bottom. (My dehumidifier is the disk type, which won't work right if you stick it inside a hot box)
__________________
How To - Calculating Exposure Time
 
 
Old 4 Weeks Ago Oct 16, 2019 10:01:52 AM -   #4 (permalink)
Forum Member
T-Shirt Apprentice
Thread Starter

oceangraphix's Avatar
 
Member Since: Jan 2018
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Thanks: 0
Thanked 0 Times in 0 Posts


Default Re: Emulsion drying, does drying print side down matter?

Thanks for the inputs. Your help is appreciated. I have made screens in my Vas*** screen dryer, print side down. I suspected gravity played a part. This warming cabinet I just got can be modified, and I do have a small dehumdier that can be put inside to remove moisture. I am just finding out what is working for everyone else. Yea, dessicant bags have to be reactivated, and that's a pain. I did not want to put holes in the box as I think my small dehumdifier should do the job. Guess I'll take my crap emulsion and try using the warming cabinet with a dehumdifier. I will set it to 90 degrees and check the screens in a light save environment at 30 minutes, 45 minutes, 1 hour, etc until I am sure it is dry. This Vast** drying cabinet may not dry them enough as 2 hours later, I put the screen on my burning table (there was buildup of emulsion from end of scoop coater that I did not flatten out) and the screen stuck to the glass on the burning table when I was done burning. Then, the film stuck to the screen emulsion and left some of the positive film emulsion and image(ink) on the screen and had to be washed off. I believe the emulsion was simply not dried enough, but felt dry to the touch. I was impatient and should have let dry overnight I think. If I have the time, I can run my main dryer overnight. But this new warming cabinet is much bigger and has the proper temp. Just need to remove the humdiity one way or another. I have made several screens and printed with them, they wash out well and are holding up. Should I run test burns each time I try a different emulsion or try to gauge it? I have a good idea of what I am doing, but do not have the experience yet to be consistent with results. Switching emulsions is not helping the matter, but my first batch was crap emulsion. These are my problem areas, properly coating and drying a screen, and my positive film sticking to the screen after burning.

Last edited by oceangraphix; 4 Weeks Ago at 12:34 PM..
 
Old 4 Weeks Ago Oct 16, 2019 7:07:36 PM -   #5 (permalink)
Senior Member
Certified T-Shirt Junkie


NoXid's Avatar
 
Member Since: Apr 2011
Location: Portland OR USA
Posts: 3,008
Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Thanks: 150
Thanked 545 Times in 519 Posts


Default Re: Emulsion drying, does drying print side down matter?

One thing that helped me get this sorted, was picking up a cheap (~$10) humidistat from Home Depot. I put it in the drying box so I have an actual number to look at when I check progress. I generally get it down into the 30-something percent range, but the 40s should be good enough.
__________________
How To - Calculating Exposure Time
 






This is a discussion about Emulsion drying, does drying print side down matter? that was posted in the Screen Printing section of the forums.

Quick Reply
Type Your Message Below:
Do NOT Post Self Promotional URLs, Advertisements, Sales Offers or Requests. It is against our Forum Guidelines.
Options

Register Now

In order to be able to post messages on the T-Shirt Forums, you must first register.


Please enter your desired user name, your email address and other required details in the form below.

Your username must be between 2 and 16 characters and contain only letters and numbers (no special characters like hyphens, *, ', ~, etc)
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.

A confirmation email will be sent to this address, so please make sure it is accurate and that your email software is set to allow emails from our domain: t-shirtforums.com (sometimes the confirmation email gets accidently filtered into Yahoo/AOL/Hotmail/Gmail spam folders)
.

You won't be able to post until your email address has been confirmed. We take your privacy very seriously. Feel free to review our Privacy Policy in a new window.
Email Address:
First Name
It's nice to be able to be on a "first name" basis with the people you talk to in a forum. This is a totally optional field; if you like being on a first name basis, please enter your first name below :)

Log-in


Thread Tools

Posting Rules

Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


All times are GMT -8. The time now is 06:18 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright 2004-2014 T-ShirtForums.com. All rights reserved.