I worked for Packaging Corp of America (PCA) for many years.
http://www.packagingcorp.com/
We used Heidelberg Presses (we had 2 large ones and 1 small one)
http://www.heidelberg-printing-press.com/
We did point of sale printing and packaging.
http://www.packagingcorp.com/what_pos_packaging.html
We printed most all the candy boxes (Milk Duds, Good and Plenty, etc), Oral B Toothbrush boxes (when they packaged them in boxes), Rawlings Sporting Gear Boxes, The full Kotex line of boxes, all Beatrice Cream Cheese Boxes (some 400 brands of Cream Cheese are processed by Beatrice), and so many others.
Banner Printing with one of these huge inkjet printers is no big deal, it is simply not an involved process. Not like the type of printing we did at PCA.
Go to this website http://www.magicvinylprinting.com/ and scroll down to "The Vutek 5300 In Action" to see a short video of one of these 16'+ superwide inkjet printers in action.
or try this direct link...
http://www.magicvinylprinting.com/magic_vinyl_printing_in_action/magicvinylprintingvutek5300.wmv
It appears that the poster in question was absolutely possible to have been made after the collapse of the building. No doubt that it is possible.
Here are a few questions that would be very interesting to see answered:
1. Can someone from the US Intelligence community track down exactly WHERE in Beirut this was printed? This involves calling the printer manufacturers capable of producing this poster and getting their lists of customers in Beirut.
2. What is the cost?
3. Who ordered this?
4. When was it ordered?
IMO, it is unlikely that, out of the blue, some protesters got the idea of this poster, a picture of Condi Rice, the historically significant heading of the 10 year old previous "massacre", located the print shop, got the picture to the shop, got the money for this, the shop produce it and it get delivered and displayed
all in 3-4 hours after the building collapsed.
It IS possible. It is NOT likely.
IMO, it is almost guaranteed that the print shop was prepped before hand to prepare for a large banner. You don't produce something like this on the spur of the moment and do it that quickly. There HAD to be some type of prior planning.
The question is: Was that prior planning evidence of a planned massacre or staged event?
At the sign company I worked at we produced large format inkjet banners for billboards and other specialty signage. I'm talking 10'-20' x whatever roll length. The banners are printed on Flexface (reinforced vinyl). Which, from far away looks thinner and more supple than it really is. But, to support a banner of that size, the material needs to be very strong. A billboard company would stock the flexface and could presumably have much of the graphics done ahead of time, but there is still the issue of what you did in advance. I mean, are you "planning" on an incident where heavy civilian casualties give you an opportunity like this?