[Kornit 931] NP Too High - T-Shirt Forums

Hi, Unregistered. | Today's Posts

T-Shirt Forums
User Name

Register Today For Free!

Forgot Your Password?

Site Navigation

+   T-Shirt Forums > T-Shirt Industry Information > Direct to Garment (DTG) Inkjet Printing > Kornit
Discussion, tips, pictures, reviews and peer to peer support for current and future Kornit DTG owners.

[Kornit 931] NP Too High

Share This Thread Thread Tools
Old June 8th, 2018 Jun 8, 2018 6:42:20 AM -   #1 (permalink)
Forum Member
Be nice, this is my first post :)

CrazyGearHead's Avatar
Member Since: Jun 2018
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Thanks: 0
Thanked 0 Times in 0 Posts

Default NP Too High

Hi, Guys!

New to the world of DTG and printing in general. We are from Latin America and bought a Breeze about 6 months ago.

We've been printing without major issues, however, in the past couple of weeks we've been facing the issue of Negative Pressure too high. I've found some super helpful post on this and other issues (such as https://www.t-shirtforums.com/kornit/t541346.html) but we haven't been able to fix it so far.

Quick run through issues we've had and solutions we've found:


- When turning the machine on NP level is "too high", it started out as being around -3.1 (-2.72 is normal) and quickly coming down to normal, however, as the problem has intensified, we've found it has started higher (-4.86 is the record) and coming down at increasingly slower rates

- During Printing it pauses with levels. We've been facing higher and higher levels of NP and slower and slower rates of it coming down as the problem carries on

- Degassing valve and motor wouldn't turn off for hours


We've had a lot of help from Kornit technicians, however, we're still having this issue and only seems to get worse! things we've done include:

- Making sure everything is tight and secure. We found that some of the lines from the splitter, the degassing valves and even to and from the sensors and gas tank in back of the ink had some humidity. We dried and made sure everything was tight again

- We cleaned the S-tank for W2 (it had a ton of sediment!)

- changed the P values for the degas system. Kornit values (at least what we've been told) are: P1 & P3: -57, P2 & P4: -67. We've tried P1 & P3: -59, P2 & P4: -60 which seemed to fix the problem but it was temporary, now we're at P1 & P3: -30, P2 & P4: -40 and again, it seems to be fixed but we're worried if its temporary (this also fixed the issue of the valve and motor always being on)

- Temporary fix for pressure too high while printing: hitting the "Purge & Wipe" button on the pannel (not the sotware) would relief pressure for an hour or so

So that's our story so far, if anyone else has had this issue and found a permanent solution we would be super gratefull, if anyone has any coments on our fixes (either good or bad) we'll also be glad to hear! Again we're still learning (I don't think we could even qualify as Padawans yet) so any input from you is super valuable.

Thanks and we're glad to have found this community .... CHEERS!
Sponsored Links
Old June 9th, 2018 Jun 9, 2018 11:40:53 PM -   #2 (permalink)
T-Shirt Lover
T-Shirt Fan

E-shirt's Avatar
Member Since: Mar 2009
Posts: 41
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Thanks: 5
Thanked 9 Times in 6 Posts

Default Re: NP Too High

you are looking in the wrong direction. The degas system is a different system from the NP systems.

Did you check the vacuum release valve?
there is a pdf in the Kornit support area with the right procedure to release a stuck valve.

Also check that the the tap placed after the valve is not completely closed.

This is a discussion about NP Too High that was posted in the Kornit 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.

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
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 :)


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Imaging Supplies Warehouse July 2015 Tip What is high definition? Deborah Sexton T-Shirt Industry News 0 May 5th, 2015 11:27 AM

All times are GMT -8. The time now is 09:01 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.