The stitch is the decision that determines how a book opens, how flat it lies, and how long it survives. Choose it after the paper has been cut and you are usually stuck with a structure that fights the material. Choose it before, and the rest of the binding follows almost automatically. This article covers three structures that between them handle most of what a small bindery is asked to make: Coptic, long-stitch, and case binding.
All three are sewn through the fold of folded sections, and all three rely on the same principle: thread passed through a fold and around something — a station, a tape, a cord — holds the section to its neighbours. What differs is what the thread passes around and whether the spine is left exposed or covered.
Three structures, three different jobs
| Structure | Sewing | Spine | How it opens | Best for |
|---|---|---|---|---|
| Coptic | Chain stitch, no supports | Exposed | Completely flat | Sketchbooks, journals, single-section or multi-section |
| Long-stitch | Thread through stations in the spine | Exposed | Flat, with a visible spine pattern | Soft-cover notebooks, leather wraps, historic styles |
| Case binding | Kettle stitch on tapes or cords | Covered with boards and a spine | With a hollow or tight back | Hardbacks, editions, books that must look like books |
Thread, needle and stations
Sewing thread for books is linen, and it is specified as a ply number — 18/3 and 25/3 are the common sizes. The first number is the yarn count and the second is the number of plies; a higher count is finer. 18/3 is a good general-purpose thread for sections of ordinary book paper. Use 25/3 or heavier for very thick sections or heavy paper, and finer thread for thin sections so that the sewing does not swell the spine.
- Wax the thread by drawing it across a block of beeswax. Waxed thread grips, tangles less and sits more evenly in the fold.
- Needle size follows the thread. A needle that is too large opens the fold and leaves a visible hole; too small and the thread will not pass.
- Sewing stations are the holes the thread passes through, punched with an awl through a folded section. Space them evenly — typically 2 to 4 cm apart for a book under 20 cm tall.
- A sewing frame holds the tapes or cords under tension while you work. Coptic and long-stitch do not need one; case binding on tapes very nearly does.
Sections are usually 4 to 6 sheets, folded. More than 6 and the inner sheets are hard to fold and the swell at the spine becomes difficult to control. Fewer than 3 and the section is fiddly to sew and the finished block feels loose.
Make a simple card jig with the station positions marked, and use it for every section in the book. Stations that drift by a millimetre from section to section make the sewing line wander visibly in an exposed spine.
Coptic: exposed and flat-opening
Coptic binding sews each section to the one before it with a chain stitch at the spine edge, with no supports and no adhesive at the spine. The result is a book that opens completely flat and whose spine is the sewing itself. It is the right structure for a sketchbook, where the ability to work across a double page matters more than the look of a hardback.
Prepare the sections and the boards
Fold sections with the grain parallel to the spine. Cut two boards to the height of the sections, drill or punch holes in them at the same stations, and line them up with the first section.
Sew the first section to the boards
Start inside the first section, pass out through the first station, through the corresponding board hole, and back into the section at the next station. This is the only section sewn directly to the boards.
Chain to the next section
For each subsequent section, pass the needle out of the fold, loop it under the stitch of the section below, then back into the fold. This chain is what locks the sections together.
Finish at the back board
The final section is sewn to the back board in the mirror of the first, and the thread is tied off inside the section.
Tension is the whole craft in Coptic. Pull each chain stitch snug but not tight. Too tight and the sections bow and the book will not close; too loose and the spine gapes and the sections shift. The finished block should lie flat on the bench with no gaps between sections at the spine.
Long-stitch: sewing through the spine
Long-stitch sews through holes punched in the spine of the cover rather than around supports, and the thread runs in long passes from station to station along the inside of each section. It works best as a soft-cover structure: a single section of heavy paper with a wrapper, or a multi-section block sewn into a leather or card wrap.
- Fold the sections and the cover, and punch the station holes through the whole assembly so they align.
- Take the needle through the first station, inside the first section, and out at the next station.
- Pass the thread down the outside of the spine to the next station and back in.
- Repeat along the spine, and at the end of the section return along the line to complete the pattern.
- Link the next section through the thread of the previous one so the sections are joined, then continue.
The attraction of long-stitch is that the sewing is the decoration. With a contrasting thread and evenly spaced stations, the spine becomes a design element, and there is no covering step at all. The limitation is structural: without boards and a hollow, the block has less protection, and a heavily used book will eventually loosen at the outer stations.
Pulling every stitch hard compresses the folds and creates spine swell — the block becomes thicker at the spine than at the fore-edge, and the boards will not sit flat. Sew firmly and evenly; the thread is not a clamp.
Case binding: the kettle stitch and the tapes
Case binding is the structure most people mean when they say "hardback". Sections are sewn to tapes or cords at three or more stations, with a kettle stitch linking each section to the one below at the head and tail. The sewn block is then glued at the spine, lined, and cased into boards covered in cloth or paper.
- Tapes or cords carry the block. Three tapes across a book under 25 cm tall, four or five on a larger one.
- The kettle stitch is made at the head and tail after each section, passing behind the previous section's thread to lock the chain.
- Spine lining follows sewing: a layer of mull or a paper lining, then a hollow tube of paper to let the spine open without cracking.
- Headbands are sewn or glued at head and tail. A sewn headband is a structural nicety; a glued one is decorative.
- The case is made separately — boards, spine strip, covering material — and then attached, which is why the structure tolerates error better than the others.
Adhesive choice matters at the spine. PVA is strong, flexible and quick, with an open time of perhaps 5 to 15 minutes depending on the grade and the room, but it is not reversible and it sets hard. Wheat starch paste is slower, weaker, and completely reversible with water — which is why it is used for anything that may need repair later. Many binders use a mix: paste for the spine lining where flexibility and reversibility matter, PVA for the case where strength matters.
Which one to learn first
Learn case binding first if you want books that look like books, because it is the most forgiving and the most useful. Learn Coptic first if you want to make something in an afternoon that works beautifully and teaches sewing tension immediately. Long-stitch sits between the two and is the easiest to do well with the least equipment, since it needs a needle, thread, an awl and a knife.
Before committing a finished text block, fold three sections of scrap paper at the same size and sew the structure once. Ten minutes with a dummy will tell you whether your station spacing and thread size actually work.
The sewing is the book. Everything after it is either protection or decoration.A binder, on why the block is sewn before the case is made
Pick the structure from the job, not from the last thing you made. A book that will be drawn in wants Coptic; a book that will be given as a gift wants a case; a notebook that will live in a pocket wants long-stitch in a heavy wrapper. The sewing follows the decision.