ee:pcbsoldermask
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ee:pcbsoldermask [2022/07/11 15:48] FKR@staff.hsrw |
ee:pcbsoldermask [2022/11/11 13:23] (current) FKR@staff.hsrw |
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| ===== Prerequisites ===== | ===== Prerequisites ===== | ||
| This instruction is about how to apply solder mask to PCBs. It is assumes you already have traces on a PCB (regardless of etched or milled) but **no holes yet**, like <imgref etchedpcb>. | This instruction is about how to apply solder mask to PCBs. It is assumes you already have traces on a PCB (regardless of etched or milled) but **no holes yet**, like <imgref etchedpcb>. | ||
| - | You also need [[pcbuvmasks|artwork]] (black printout to transparent foil) containing only pads (EAGLE layer 17) and vias (layer 18). Make sure it is really dark. We also suggest filling out the holes (you can use a black marker, e.g. [[https://www.amazon.de/gp/product/B01MTT2R3Q/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1|this one]] or [[https://www.amazon.de/gp/product/B0009LZULO/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1|that one]]). The room you are working in has to been protected from of UV lights, e.g. use 05 EG 027. It has special lamps and no windows (avoiding sunlight). | + | You also need [[pcbuvmasks|artwork]] (black printout to transparent foil) containing only pads and vias. You can achieve this by selecting "tStop" (layer 29) or "bStop" (layer 30) for top and bottom respectively. Make sure to select a solid fillstyle (see <imgref layer29>). |
| + | |||
| + | The room you are working in has to been protected from of UV lights, e.g. use 05 EG 027. It has special lamps and no windows (avoiding sunlight). | ||
| ===== Procedure ===== | ===== Procedure ===== | ||
| - Put on gloves to avoid fingerprints. | - Put on gloves to avoid fingerprints. | ||
| - Clean your PCB (using alcohol based solutions, e.g. ethanol). | - Clean your PCB (using alcohol based solutions, e.g. ethanol). | ||
| - | - Take out the solder mask laminate. Cut two pieces slightly bigger than your PCB and pack the laminate back up again. | + | - Remove the cover from the laminator (<imgref laminator>). |
| - | - Peel off the protective layer from the dim side (not the shiny side) of both pieces. Hint: apply tape to help removing the foil. | + | - Heat up the laminator and wait for it to reach 115°C. Do not touch the orange/red rolls. |
| - | - Apply the laminate carefully to the PCB (<imgref prepareforlamination>). Avoid air bubbles at all cost because otherwise the solder mask will later break at these points after curing. Hint: use a credit card to evenly distribute pressure. Alternatively use the cold laminator for prepressing. If it's not going well, remove the laminate and try again with a new piece. You can use the development solution to strip of the laminate completely. | + | - Laminate. The result may look like <imgref laminated> |
| - | - Heat up the laminator and wait for it. | + | - Turn off the heat to the laminator |
| - | - Laminate. Multiple times if necessary. The result may look like <imgref laminated> | + | - Check the the PCB for air bubbles. The solder mask will later break at these points after curing. If neccessary you can use the development solution to strip of the laminate completely. |
| - Chill PCB with cold water. (//Necessity of chilling is questionable.//) | - Chill PCB with cold water. (//Necessity of chilling is questionable.//) | ||
| - Align the artwork to your PCB and tape it. | - Align the artwork to your PCB and tape it. | ||
| Line 25: | Line 27: | ||
| - Dry the PCB for example by feeding it again multiple times through the hot laminator but covered with baking paper. | - Dry the PCB for example by feeding it again multiple times through the hot laminator but covered with baking paper. | ||
| - Complete the curing of the solder mask by exposing it further for 20-30 minutes or leaving the PCB at a place with sunlight for a day (<imgref finished>). | - Complete the curing of the solder mask by exposing it further for 20-30 minutes or leaving the PCB at a place with sunlight for a day (<imgref finished>). | ||
| + | - Turn off the laminator and put the cover back on (check temperature before you do that). | ||
| - Go on like in a usual PCB manufacturing process (drill holes, punch via, solder). | - Go on like in a usual PCB manufacturing process (drill holes, punch via, solder). | ||
| <imgcaption etchedpcb|Etched PCB>{{:ee:sm2_etched_pcb.jpg?200 |}}</imgcaption> | <imgcaption etchedpcb|Etched PCB>{{:ee:sm2_etched_pcb.jpg?200 |}}</imgcaption> | ||
| - | <imgcaption labsetup|Lab setup>{{:ee:sm1_lab_setup.jpg?200 |}}</imgcaption> | + | <imgcaption layer29|Layer 29 / Fillstyle setting>{{:ee:sm7_layer29_fillstyle.png?200 |}}</imgcaption> |
| - | <imgcaption prepareforlamination|Prepare for lamination>{{:ee:sm3_prepare_for_lamination.jpg?200 |}}</imgcaption> | + | <imgcaption laminator|Dry-film laminator>{{:ee:sm6_laminator.jpg?200 |}}</imgcaption> |
| <imgcaption laminated|Laminated>{{:ee:sm4_laminated.jpg?200 |}}</imgcaption> | <imgcaption laminated|Laminated>{{:ee:sm4_laminated.jpg?200 |}}</imgcaption> | ||
| <imgcaption finished|Finished>{{:ee:sm5_finished.jpg?200 |}}</imgcaption> | <imgcaption finished|Finished>{{:ee:sm5_finished.jpg?200 |}}</imgcaption> | ||
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| - Complete the curing of the solder mask by exposing it further for 20-30 minutes or leaving the PCB at a place with sunlight for a day (<imgref finished>). | - Complete the curing of the solder mask by exposing it further for 20-30 minutes or leaving the PCB at a place with sunlight for a day (<imgref finished>). | ||
| - Go on like in a usual PCB manufacturing process (drill holes, punch via, solder). | - Go on like in a usual PCB manufacturing process (drill holes, punch via, solder). | ||
| + | |||
| <imgcaption etchedpcb|Etched PCB>{{:ee:sm2_etched_pcb.jpg?200 |}}</imgcaption> | <imgcaption etchedpcb|Etched PCB>{{:ee:sm2_etched_pcb.jpg?200 |}}</imgcaption> | ||
ee/pcbsoldermask.1657547336.txt.gz · Last modified: 2022/07/11 15:48 by FKR@staff.hsrw
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