Glue perfect binding machine Perfect glue binding machine is a type of glue binding that is often used for pad and book printing. The process uses hot glue to bind the pages together. A stack of paper is slid through the perfect binding machine on rollers. The spine is then coated with hot glue and cooled by pans. Finally, the cover is wrapped around the spine. Model: HD39 Max. binding length:420mm Max. binding thickness: 40mm Model: HD50 Max. binding length:420mm Max. binding thickness: 50mm