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| really proper way to apply thermal compound? |
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| wraper:
I have some experience with using LOCA adhesive for attaching touchscreen to display where I could actually see the result. I can say that the best way is is to apply it as X. It's the best way to fill all of the space with minimum amount of paste and avoid air bubbles at the same time. If you apply only drop at the center it will spread as circle and space you need to fill is not round. So either drop needs to be huge (a lot of paste will squeeze out) or it won't fill the corners. |
| coppercone2:
it spreading out does not create microbubbles in it because it kind of tears as it spreads on a microscopic level? I don't think this stuff is very fluid like, like the glue is. It's more like a suspension I think, like chocolate chips in a dough ? Are you sure there is not some kind of sheer surface forming that can introduce a void? Or kind of like surface evaporation or other effects making a surface thats kind of like a cake thats beginning to bake in the oven where the very skin is stiffer, and if you poke it with a knife you get cracks. Like imagine you just put a dollop of muffin compound on a baking tray, broil it till the surface gets kinda solid, then smush glass down on it. I think you will have voids because of the cracks. I am also weary of using a transparant surface as a window because the surface tension of the whatever is different so it might behave differently. |
| T3sl4co1l:
Relevant: https://www.infineon.com/dgdl/Infineon-AN2006_02_Application_of_screen_print_templates-AN-v1.0-en.pdf?fileId=db3a304412b407950112b40ed3f71297 Tim |
| wraper:
--- Quote from: coppercone2 on December 10, 2018, 01:54:02 am ---it spreading out does not create microbubbles in it because it kind of tears as it spreads on a microscopic level? I don't think this stuff is very fluid like, like the glue is. It's more like a suspension I think, like chocolate chips in a dough ? Are you sure there is not some kind of sheer surface forming that can introduce a void? --- End quote --- That adhesive is not really that fluid. It's more fluid than thermal paste but not nearly like water. The trick is that air bubbles are not entrapped because touch/spreading of adhesive or paste starts from single point thus pushing all air out. |
| wraper:
--- Quote from: T3sl4co1l on December 10, 2018, 02:01:46 am ---Relevant: https://www.infineon.com/dgdl/Infineon-AN2006_02_Application_of_screen_print_templates-AN-v1.0-en.pdf?fileId=db3a304412b407950112b40ed3f71297 Tim --- End quote --- This way is good as well. It provides routes for air to escape. But you won't do this well without properly designed stencil. |
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