f2sangreo
Number of posts : 20 Age : 52 Location : 79 Molave St., corner Kamagong St., Duyan-Duyan, Proj. 3, QC. Member since : 2007-11-24
| Subject: DEVELOPER EXPIRATION Tue Feb 05, 2008 10:09 am | |
| GOOD DAY TO EVERYBODY!
QUESTION: ANG DEVELOPER PO BA NAG-EEXPIRE NG ILANG LINGGO SA PROCESSOR BIN? DEPENDE PO BA SA BRAND NG PROCESSOR YUN O DEPENDE PO KUNG CALIBRATED ITO O HINDI. KAILANGAN PO BA I-CALIBRATE ANG SYSTEM TUWING MAGPAPALIT NG DEVELOPER? MARAMING SALAMAT PO IN ADVANCE SA INYONG SAGOT! | |
|
presstech
Number of posts : 257 Age : 76 Location : Metro Manila Member since : 2007-05-29
| Subject: Re: DEVELOPER EXPIRATION Tue Feb 05, 2008 11:10 am | |
| In our company, we normally do a complete replacement of the developer every 2 to 2.5 weeks depending on the usage. We only use the replenisher to maintain the level in the tub. As the developer weakens, we increase the developing time to compensate. The important thing is to maintain the density of the emulsion at the correct value (usually between 3.5 to 4.5). You can check this by using a densitometer. There is no need to do a system recalibration unless the screen values do not come out correct. This can be checked by printing out a screen wedge and measuring the dot values with a densitometer. Hope this info helps. | |
|
presstech
Number of posts : 257 Age : 76 Location : Metro Manila Member since : 2007-05-29
| Subject: Re: DEVELOPER EXPIRATION Tue Feb 05, 2008 11:14 am | |
| We have used many brand of processors; and, in my opinion, they are all the same. The important factor in a processor are: 1. correct and stable temperature control 2. reliable speed control 3. replenisher system 4. good condition of rollers | |
|
Sandman
Number of posts : 404 Location : Middle East Member since : 2007-11-21
| Subject: Re: DEVELOPER EXPIRATION Sat Feb 09, 2008 1:00 am | |
| Kahit gaano katagal mong gamitin (2 weeks to 1 month) make sure you do the following:
1) You do a regular linearization curve (2% file = 2% dot; etc...) 2) You use a wedge and check your microlines if positive and negative lines are same in thickness. 2) You do a regular variation test across the film/plate (variation not exceeding 1.5%) 3) Your density (film) should be according to what Mr. Presstech has suggested (3.5 - 4.5). 4) You log, your density and dot readings every day to monitor if it's starting to build a trend (humihina ang density, nagbabago ang dots, etc...). These data can give you so much information later on to guide you on your decision making kung hanggang kailan mo talagang pwedeng i-maximize ang chemicals mo.
My humble thoughts.
Larry
Last edited by larrysison on Fri Oct 01, 2010 9:01 am; edited 1 time in total | |
|
ibler
Number of posts : 112 Location : cebu Member since : 2007-06-05
| Subject: Re: DEVELOPER EXPIRATION Sat Feb 09, 2008 10:36 am | |
| Congrats!!!
and thanks for the tips! | |
|
presstech
Number of posts : 257 Age : 76 Location : Metro Manila Member since : 2007-05-29
| Subject: Re: DEVELOPER EXPIRATION Sat Feb 09, 2008 1:23 pm | |
| Welcome back Larry! Miss na yung icon mo. | |
|
f2sangreo
Number of posts : 20 Age : 52 Location : 79 Molave St., corner Kamagong St., Duyan-Duyan, Proj. 3, QC. Member since : 2007-11-24
| Subject: Re: DEVELOPER EXPIRATION Fri Jul 03, 2009 2:32 pm | |
| Thanks for all your professional advice! | |
|
Sponsored content
| Subject: Re: DEVELOPER EXPIRATION | |
| |
|