The Message Board for the Philippine Printing Industry (Established 2007)
 
HomePortalFAQSearchRegisterMemberlistUsergroupsLog in

Share | 
 

 How to use PH paper tester

View previous topic View next topic Go down 
AuthorMessage
revo2



Number of posts : 21
Location : Philippines
Member since : 2009-05-26

PostSubject: How to use PH paper tester   Wed Jan 12, 2011 11:54 pm

Hi to all, I'm new in the industry and our printing is only a small one. I just want to ask all of you gurus in the printing industry how to use the PH paper tester. My operator doesn't know how to use it also. Thanks in advance. Smile
Back to top Go down
View user profile
presstech

avatar

Number of posts : 256
Age : 69
Location : Metro Manila
Member since : 2007-05-29

PostSubject: Re: How to use PH paper tester   Fri Jan 14, 2011 7:20 pm

Hi Revo2!

PH papers normally are supplied with a PH color chart which shows different colors corresponding to different PH levels. To use the paper, you tear off a strip and immerse it in the fountain solution. The color developed in the paper is then compared with the PH color chart to determine the PH level of the solution.
Please note that the conventional fountain solution requires a certain level of acidity. This acidity together with the gum arabic desensitizes the non image areas of the plate. This prevents scumming in the non image areas. Too much acidity, however, will reduce the ability of image areas to hold ink, resulting in ghosting. It is important, therefore, to maintain the right PH level.

A PH of 7 is neutral. Values higher indicates alkalinity. Values lower indicates acidity. A PH range of 3.5 to 4.5 is generally required. However this may vary depending on the ink, paper and fountain concentrate used.

Hope this info helps. sunny
Back to top Go down
View user profile
revo2



Number of posts : 21
Location : Philippines
Member since : 2009-05-26

PostSubject: Re: How to use PH paper tester   Sun Jan 16, 2011 7:52 pm

Hi Sir Presstech,

Good day sir. Thank you very much sir for your reply and sharing your knowledge to us. Mabuhay ka sir. Very Happy
Back to top Go down
View user profile
Sponsored content




PostSubject: Re: How to use PH paper tester   

Back to top Go down
 
How to use PH paper tester
View previous topic View next topic Back to top 
Page 1 of 1
 Similar topics
-
» why our poor ppl so fear for paper articles
» Sri Lanka Singer commercial paper rated 'F1(lka)'
» Sri Lanka People's Leasing to sell Rs500mn 12-m paper
» Sri Lanka Abans commercial paper rated F2(lka): Fitch
» Plantation Companies (RPC) - Product/Revenue Mix

Permissions in this forum:You cannot reply to topics in this forum
Filipino Printers Forum :: Technical Topics :: Press-
Jump to: