Previously the company's binding division was having to outsource the scoring, meaning it was not cost-effective to handle more than 20,000 jobs.
However, it won a 5m-run job and bought the spine-creasers to fit to a Muller Martini stitching line, allowing it to fold and stitch in one pass.
According to bindery manager Shaberahmed Bobat the small investment has made a "massive" difference.
He said: "The investment paid for itself in one job. I would say that it has knocked about three quarters of the time off of fold and stitch jobs and we can keep a lot more work in-house. For this job we wouldn't have made the delivery if we had to send the work out. It has made a massive difference."
Bobat added that the company will now be seeking similar long run lengths.
Tech-ni-fold's spine-creaser is designed to stop ink from cracking on the spine of a book when it is folded.
See also:
Security accreditation for St Ives Direct Leeds site
UPDATE: 170 job losses planned as St Ives issues profit warning