Aluminum board process-B

5.4 board inspection
5.4.1 line surface must be in accordance with the requirements of the MI to check all the content.
5.4.2 must check on aluminum pcb surface, aluminum surface dry film cannot have film falls and broken.
5.5 etching
5.5.1 for copper base is commonly 4 oz, will there is a certain difficulty in etching.First plate must be approved by the captain in person to do board, made in the spot check, line width, line spacing should be strengthened once every 10 PNL plate spot check line width, and make records.
5.5.2 recommended parameters: speed: 7 ~ 11 dm/min pressure: 2.5 kg/cm2 proportion: 25 be temperature: 55 ℃ (the above parameters are for reference only, the test plate results shall prevail)
5.5.3 back membrane should be paid attention to the time of the control between 4 ~ 6 min, because aluminium will reaction with NaOH, but also must ensure that the membrane clean, backing down membrane liquid membrane was not allowed to turn up the heat.No protective film of the plate, aluminum, from liquid membrane in the back up after the board will not stay to wash water on a board in time of liquid membrane, prevent the alkali corrosion of aluminum surface.  
5.6 corrosion inspection
5.6.1 normal board.
5.6.2 it is forbidden to use the blade repair line, in order to avoid injury and dielectric layer.
5.7 the solder mask
5.7.1 production process:
Brush copper surface grinding plate (only) to screen printing green oil (the first), and preliminary drying screen printing green oil (second) and the preliminary drying - exposure and development - plate mill, the acid pickling process. Under the soft brush - after curing -
5.7.2 reference parameters:
5.7.2.1 yarn used 36 t + 100 t
First 75 ℃ 5.7.2.2 x 20-30 min;The second 75 ℃ x 20-30 min
5.7.2.3 exposure: 60/65 (single) 9 ~ 11
5.7.2.4 enhancement: speed: 1.6 ~ 1.8 m/min pressure: 3.0 kg/m2 (total pressure)
5.7.2.5 curing: after 90 ℃ * 60 min + 60 min + 110 ℃ 150 ℃ above x 60 min parameters for the use of the DSR - 2200 tl ink, used only for reference.
5.7.3 note printing for control of air bubbles, if need, can add 1-2% of the diluent.
5.7.4 clappers before clappers member should check panel, there is a problem of instruct the captain and then to the clapper.   
5.8 HASL
5.8.1 spray before tin for aluminum plate with protective film tear protective film after spray tin.    
5.8.2 edge with both hands, it is strictly prohibited by hand directly touch the plate (especially aluminum surface).
5.8.3 operation, fight chafed.
5.8.4 tin cookie sheet before 130 ℃, 1 hour, and baking sheet to spray tin interval time less than 10 minutes.In order to avoid temperature difference cause a layered with ink.    
5.8.5 rework plate spray is only allowed to return once, if more than one board, to distinguish for special treatment.    
5.9 aluminum surface passivation treatment
5.9.1 level passivation process: (1) scrubbing brush (500 #) to (2) water - > (3) passivation, (4) washing the x 3-5. Dry - 6 drying
Note: (1) grinding plate: only aluminum surface grinding, FR4 parameter grinding plate.First board to check line no scratches, as well as the tin cried, uniform grinding crack.
(3)passivation: potion ingredients open cylinder quantity cylinder volume liquid temperature control concentration spraying in tank pressurization rate
Na2CO3 (CP) 50 g / 6500 g l, 130 l, 40 ~ 50 ℃ 2.0 ~ 3.0 1.0 ~ 1.5 m/min effective soaking time 10 ~ 15 s 100 m2 CP (K2CrO4) 15 g/l,  1950 g NaOH (CP) 390 g, 3 g/l
6 drying: 80 ~ 90 ℃.
Tyle = "the oledata.mso - spacerun: 'yes', the font size: 10.5000 pt; the font-family:" tahoma "; "> 5.7.2.5 curing: after 90 ℃ * 60 min + 60 min + 110 ℃ 150 ℃ above x 60 min parameters for the use of the DSR - 2200 tl ink, used only for reference.
5.7.3 note printing for control of air bubbles, if need, can add 1-2% of the diluent.   
5.7.4 clappers before clappers member should check panel, there is a problem of instruct the captain and then to the clapper.