We're sorry, but your question is still too broad. That's why Wikipedia isn't giving you the complete answer. Epoxy resins are a wide class of compounds, and their industrial production is complicated. There is no "diagram" of an industrial process. Look at this page here:
http://www.epicresins.com/gallery.asp They have photographs of their production equipment, and they are likely very proud of that. There is no diagram or flowchart, because they don't want to talk about that. My best suggestion for you is that you get the basics from Wikipedia. What is an epoxide resin? How does it work chemically? What is it used for? Once you have that, then go to a print library and read several books, maybe more than a dozen, to piece the process together. Heck, even read technical journals of the industry for new developments in epoxide resin production -- they might have a diagram for you. Because they are likely developing a new process, one that they're proud of, and want to see it to you. But you may not even understand what they're talking about, until you've at least skimmed a dozen old books on the subject.