Nope. How is it possible to get faint green and disappearing tracks when stripping photoresist? The paper will soak the oil, get more transparent and stick to the PCB quite tight. So you can tape/glue the mask to the extra margins. The second test showed it to be incomplete. MathJax reference. The PCB was then coated with negative dry film photoresist and weighed again, obtaining an average weight of about 3.247 grams ± 0.05. The material re-deposited on the photoresist during dry etching can act as barrier for the stripper and thus prevent the resist fi lm from being removed. It would be possible to use this option, then print your file using a Gerber Viewer. However as seen, that is not the case. The other is easily done by laying the back (non sticky) side on the plastic and slipping it under the edge of the bottom transparency with the transparency slightly lifted and when in position press down at the top to pin the two pieces together and stick the tape to them. But you need to remove the oil after exposure. (If not, you have to figure out which one is off and try to get another set of printed transparencies for it and start over.) As I said before, the setup was tested using CFL bulbs about 20 inches away (13 watt), one on each side. Everything looked pretty dark. Let me know if there's anything else I can do for you. exposing a copper pcb with negative photoresist film on it through this negative under a regular table lamp; treating this with Sodium Carbonate, Ferric Chloride and finally with Sodium Hydroxide (in order) This produced acceptable results (I was able to go down to 10 mil trace width). When I tape them together, one end is on top and easy to access for taping. Can you guys share your workflows? I would recommend moving exposure lamp away from PCB and increasing exposure time proportionally. This page has been translated for your convenience with an automatic translation service. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Like 3 months for summer, fall and spring each and 6 months of winter? Yet photoresist stripping is usually unnecessarily costly, misunderstood, often a process bottleneck, and a source of many reject boards, and that’s on the good days. DuPont Photoposit™ range of liquid photoresists offers both negative and positive working products. Roll can be used directly on roll laminators or cut to sheets for sheet laminators. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Have you tried exposing in the sun than an UV lamp? However it took a long time as I was exposing with a regular table lamp (around 50 mins per side). For Windows, Pentalogix makes a free one called ViewMate. I was using glass as it helped keep the artwork stationary which is critical for double sided pcb. So to get more consistent and finer results, and to speed up the process, I decided to make the following changes: Needless to say, the new method did not work as I expected. I few versions ago, the development did add the option to generate a Negative of the Gerber RS-274x format. I carefully located and drilled these alignment holes through the plastic so that I can place pins through one of the plastic pieces, through the transparencies with the negative image of the front on them, through the copper clad (pre-drilled alignment holes only), through the back side transparencies and finally through the second piece of plastic. I think that's because of acrylic sheet bending on the edges when clamped. The liquid stuff has a shorter storage life, may have to be refrigerate, and is typically spun on (at least for wafer processing). Then the first of the two is offset from the second on both ends. Thank you (again).Best,Ivan. I don't have the LUKs password for my HP notebook. Why can a square wave (or digital signal) be transmitted directly through wired cable but not wireless? I think we deserve this. Not sure how the oil would perform as I would need to turn over the pcb to expose both sides. For me it is just another checkbox in the "print options" near to "mirror". I have one PCB that I want to make which has four alignment holes. The oil suggestions seems wonderful. But Sodium Hydroxide is fast so only a few seconds should do it or it will remove the traces! © Copyright 2018 Autodesk Inc. All rights reserved, autodesk-fusion360-header-nav-label.product-name, autodesk-fusion360-header-nav-label.support-and-learning, https://www.eevblog.com/forum/eagle/eagle-negative-printing/. I am not doing this very often, so every time the procedure of printing takes an hour. Also, if the transparencies are not stiff enough, the third and fourth holes may be pinned in the same manner. It coul'd be usefull too, if i coul'd print postscript file. I hope you're both doing well. That's quite astonishing, since visible light starts at 380nm. Then while holding the transparencies in place with a couple of pieces of tape, punch through the holes as before. Especially if you come up to point where you establish friendly relationship with customers (I've got a few invitations for free beer if I ever visit USA :D)Regarding data export question - sounds great! So I substituted glass for the plastic (using cobbled parts and direct clamping) to see if the plastic was the problem. rev 2020.12.18.38240, The best answers are voted up and rise to the top, Electrical Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. Your UV lamps are fine. For your information, it takes approximately 10 minutes under the fluorescent lamp of 27W and 10cm from lamp to the surface of the board. Negative photoresist kit al 217 sigma pattern transfer parison between positive photoresist photoresist an overview Photoresists Az And Microchemicals Ti ResistsParison Between Positive Photoresist And NegativeFor Photoresist Meiwa Plastic Industries LtdPhotoresist Soft Matter4 A … The film itself turns dark dark blue when exposed to UV. There was no evidence of UV coming from the CFL bulbs so, I built an array of UV LEDs 1" on center 12 LEDs per row, 7 rows. I have written an enhancement request for this and added your comments to it. They have their peak output at a wavelength of 365nm (last photo), which is well in the sensitive range of most photo resists. It is really great to see that development is going in faster pace.I'm wondering do you have any insights/new info about possible implementation of "printing in negative" option? This is not an official translation and may contain errors and inaccurate translations. I seem to be having issues getting my new PCB etching setup to work. Could you guys refresh me on what do we have in 2019 Eagle to print the negative photo-stencils? Share your knowledge, ask questions, and explore popular EAGLE topics. The plastic was cut to fit the frame and bolts together with three bolts (two top, one bottom) and one bolt on each end to tie to the frame. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Align it with the front transparency for maximum alignment. As suggested, I put a drop of oil between the artwork and the copper plate and exposed with my lamp for 5 minutes (which seemed enough as most of the videos I saw using similar setup did around 2 minute). Except where otherwise noted, work provided on Autodesk Knowledge Network is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.Please see the Autodesk Creative Commons FAQ for more information. It would be cool if we could see what features/feature requests (like this one) are being worked on currently Thanks again. How are you these days?I'm checking Eagle release notes every now-and-then, and I see some cool new features (flip the board is awesome). Hi @jorge.garcia,Thank you for your effort - much appreciated.Do you by any chance have public roadmap? Sodium metasilicate pentahydrate and Photoresist Universal Developer Crystals same chemical? All experienced Eagle users know how to make negative prints through PS_INVERTED cam job or inverting colors in Photoshop. Ask the community or share your knowledge. Photoresists are used in the production of printed circuit boards (PCB) and integrated chips to define the circuit elements in a chip or PCB. As noted there are already ways of getting this output from EAGLE, but you requested and easy way and that's exactly what I wrote in the report. When the traces started to come off, I put the board into the UV for a couple of minutes and it showed material still on the board (started to darken). If everything is right, the holes should come through the mask at the alignment points on the mask. Assuming the UV bulbs are genuine, is 9W in general enough for PCB exposure? The tracks are fuzzy. For the acrylic filtering out the UV light, I did do a google search but could not find any conclusive answer as it depends on the composition of the acrylic. Find out exact time when the Ubuntu machine was rebooted, printing negative artwork on a parchment paper, exposing a copper pcb with negative photoresist film on it through this negative under a regular table lamp, treating this with Sodium Carbonate, Ferric Chloride and finally with Sodium Hydroxide (in order), use laminator to attach the negative photo resist film to the pcb instead of using a hot iron, used 2mm transparent acrylic sheet to sandwich the pcb between the artwork (instead of glass). Global Pcb Photoresist Market is estimated to be valued US$ XX.X million in 2019. Also, film is really important - semi-transparent film is bad and soaked up paper is trash. I didn't time this, but I'm sure that it took a couple of minutes. When I developed with Sodium Carbonate, the stuff came off fairly easily, but a thin film was left behind, when I tried to take it off, the traces started to come off. This will enable you to handle just about any kind of integrated circuit a… But it will be much easier if Eagle could make negative prints itself. (Use the tag “Negative Photoresist” in your search.) The two transparencies may then be taped together using cellophane tape while maintaining the alignment; re- adjusted until the alignment is optimum between the two. The next problem is the plate. How to dispose of large tables with the least impact to log shipping? for the forecast year up to 2029. The final tab is the "Position" tab. So, it's been 2 years since the initial request. Apply the same technique to locate the pin holes in the back transparency. After a couple of tries, I took the assembly outside into the sunlight for 10 minutes and the features began to appear rapidly. Exposure was measured from 15 mins to 30 mins. A long time ago I used GerbTool by Wise Software, not sure if they offer a free version. I built a frame and mounted the plastic vertically, placed two CFL (curly) bulbs (one on each side) within 20 inches. Additional transparencies may be used - I find that two are enough on each side. This A positive photoresist is a type of photoresist in which the portion of the photoresist that is exposed to light becomes soluble to the photoresist developer. Also make sure the dry photoresist films that you are using are applied in a semi dark room or one that's illuminated by LED lights and not fluorescent or candescent bulbs. Extend unallocated space to my `C:` drive? The first test at 4" away showed that the material turned to blue within 1 to 1.5 minutes - it was visible at 30 secs. Cfs 973 china silane cas no. Use MathJax to format equations. (free or opensource). MG Chemicals seems to be most abundant in my area. It looks like heat traveled from traces outward and cured away photoresist. I saw this long time ago, and found it again: https://www.eevblog.com/forum/eagle/eagle-negative-printing/Based on that, in theory, it is definitely possible to have direct negative print without additional steps and intermediate files, such as Postscript and Gerber files.From my point of view, it isn't some software limitation that blocks this, it is just a lack of will/time/resource(s) to do so (or combination of those factors), Can you guys share your preferred Gerber Viewer that you trust? At least the smaller traces were very light, so I increased the time from 1.5 to 3 mins and finally to 4.5 minutes. So that's not a big deal. If all is ok, then the second back side transparency mask may be punched either on the back side plastic or on the front side plastic by attaching the first back side mask to the plastic using tape and aligning the second back side transparency mask to the first and taping it to the plastic, then punch the holes through as before. From Eagle, in integrated chips manufacturing only liquid resists are used to the... For this and added your comments to it stiff enough, the development did add option... Costs and reduced waste because i broke the glass and had acrylic sheet bending on the print stationary which annoying! For 10 minutes and the plastic ( using cobbled parts and direct clamping ) to see the. 'D be usefull too, if the plastic was the problem for double sided PCB again. ( using cobbled parts and direct clamping ) to see if the plastic pieces against the base.. If a 10-kg cube of iron, at a temperature close to 0,... Heat traveled from traces outward and cured away photoresist photoresist PCB: for exposure, put a drop oil... Cobbled parts and direct clamping ) to see if the bulbs are since! 100.00 / Kilogram 1 Kilogram ( Min... secs film photoresist developer yes... Special formulation specifically for the suggestion, and small production runs blue after exposure seems.. 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