I'm working on a case-bound hardcover A5 book (portrait) and this is the first time I've ever had design files for content inside the book when bookbinding. The signatures will be sewn together and for bookbinding its best to have the paper grain run parallel to the spine. This means I have to get a printer who can print the spreads with paper grain running from top to bottom of each page.
Is this direction of paper grain typical of the paper that printing services work with? What are the sizes of paper they work with before trimming?
I'm not sure I can just ask a printer to use A4 paper to print 2-page spreads, since I also need to keep some bleed edge and trim everything later. A4 would be not enough bleed. Preferably the printer would print the untrimmed spreads so I can fold them in half into signatures by hand, have bleed on the outside edges of my text block so I can trim the whole block at once after sewing and gluing it together. Does anyone have experience adding creep to their pages?
Can anyone give me any advice or tips on how to setup my file? It's my first time working on a project like this.