Couching
Part of Paper Making
The technique of transferring a newly formed wet sheet from the mold onto a felt or cloth — the essential step between sheet formation and pressing.
Why This Matters
Couching (pronounced “cooching,” from the French coucher — to lay down) is the moment when a wet paper sheet is transferred from the forming mold to a stack for pressing and drying. It sounds simple, but it is the step where most beginners lose sheets. A poorly executed couch tears, wrinkles, or leaves fiber stuck to the mold. A well-executed couch produces a flat, intact sheet that will press and dry cleanly.
In a community paper mill, couching is a repeating motion done dozens or hundreds of times per day. Learning to do it quickly, consistently, and without waste determines how productive your papermaking operation becomes. It is also the step that sets up the pressing process — sheets that are unevenly couched press unevenly, producing paper with thick and thin spots that is frustrating to write on and prone to tearing.
Understanding couching also teaches you why certain materials work as couching cloths and others do not, why wet sheets stick to some surfaces and release from others, and how to stack multiple sheets for batch pressing — all practical knowledge for running a small paper mill.
What Happens During Couching
When you lift a mold from the vat, you have a thin layer of wet fiber sitting on the mold’s woven surface. The fiber is held to the mold partly by surface tension, partly by the weight of water draining through it, and partly by mechanical entanglement with the mold’s weave texture.
To transfer the sheet, you flip the mold face-down onto a moistened couching surface and press firmly. The paper sheet transfers because:
- The couching cloth is more absorbent than the mold surface — it draws water (and fiber) away from the mold
- Applying pressure collapses the fiber mat more fully onto the couching surface, making the fiber-to-cloth bond stronger than the fiber-to-mold bond
- As you peel the mold away, the wet sheet remains behind, bonded to the cloth
The quality of this transfer depends on the moisture state of the sheet, the texture of the couching cloth, the evenness of the pressure applied, and the smoothness of the peeling motion.
Couching Surfaces
Traditional Felts
Medieval European papermakers used thick woolen felts — heavy, compressed wool blankets approximately 50 cm × 70 cm, slightly larger than the mold. Wool has excellent water absorption and a slightly textured surface that holds wet paper without allowing it to slip. When sheets are stacked felt-paper-felt-paper in a post, the felts provide cushioning for pressing.
If wool is available, make or obtain felts first. Thickness should be 5 to 10 mm — thick enough to absorb significant water, thin enough to allow effective pressing. A new felt should be pre-wetted and wrung out before first use, then kept damp throughout the papermaking session.
Cloth Alternatives
In the absence of wool, several cloth alternatives work:
| Material | Performance | Notes |
|---|---|---|
| Heavy linen canvas | Good | Absorbs well, durable |
| Cotton duck cloth | Good | Slightly less absorption than linen |
| Burlap/jute | Acceptable | Rough texture may imprint on paper |
| Woven grass mat | Poor | Low absorption, uneven surface |
| Leather | Poor | Does not absorb, sheet will not release cleanly |
The surface texture of the couching cloth transfers a faint impression to the wet paper. This is why fine writing paper traditionally had a slight felt texture — the wool fibers left a microscopic pattern. For very smooth paper, use a finer-woven cloth; for textured paper, use a coarser material.
The Couching Stone or Board
Beneath the couching cloth, you need a smooth, flat, slightly absorbent surface. Traditionally this was a rounded stone (the couching stone) or a flat wooden board. The surface should be slightly convex — raised in the center by a few millimeters — to allow water to drain outward during couching. A flat surface traps water and makes sheet release more difficult.
If you have no curved surface, place a folded cloth slightly thicker than the edges in the center of the board to create a gentle dome.
Step-by-Step Couching Technique
Step 1: Prepare the Couch
Pre-wet your couching felt or cloth. It should be damp throughout — not dripping, not dry. A dry cloth will absorb too aggressively, pulling the sheet unevenly and causing tearing. A soaking wet cloth will not absorb at all. Wring it firmly by hand, then lay it flat on the couching board. Smooth out any wrinkles — wrinkles in the cloth become wrinkles in the paper.
Step 2: Form the Sheet
Dip the mold into the vat, form the sheet, and drain until water stops actively streaming through the mold (see Dipping Technique). The sheet should be wet but no longer dripping before you attempt to couch.
Step 3: Position for Couching
Hold the mold at the far edge of the couching cloth, screen-side down, at a 45-degree angle. The near edge of the mold should be slightly off the surface; the far edge angled down toward the cloth.
Step 4: The Rolling Motion
In one smooth motion, bring the near edge of the mold down and roll it forward, pressing the entire mold surface firmly against the cloth. Think of it as rocking the mold from one edge to the other — not slapping it down flat. This rolling motion chases air out from beneath the sheet rather than trapping bubbles.
Apply firm, even pressure across the entire mold. Use both palms. Press for 3 to 5 seconds.
Step 5: Peel Away the Mold
Starting from the edge you placed down first, peel the mold straight back away from the couching surface in one smooth motion. Do not lift and twist — lift straight back, maintaining the peeling direction parallel to the long edge of the mold.
The sheet should remain flat on the cloth. If the sheet clings to the mold and tears as you peel:
- The sheet is too wet — drain longer before couching
- The cloth is too dry — re-wet it
- You are peeling at an angle — peel straight back
Step 6: Inspect the Sheet
Before placing the next felt and forming another sheet, inspect the couched sheet for:
- Tears or holes: Minor defects can be patched in the post by pressing; major tears indicate process problems
- Thick and thin spots: Uneven fiber distribution from the vat
- Wrinkles: Caused by cloth wrinkles or mold being placed unevenly
- Edge irregularity: Normal — the deckle determines sheet edges
Building a Post (Stack for Pressing)
As you couch multiple sheets, build up a stack — called a post — of alternating felts and paper sheets. The stack structure is: couching board / felt / sheet / felt / sheet / felt / sheet… / pressing board.
Number of sheets per post: Typically 5 to 20 sheets depending on press capacity. Too many sheets means the press cannot apply enough pressure to the center of the post; too few means inefficient use of press time.
Keeping sheets aligned: As the post builds, ensure each sheet is couched in the same position on its felt. Misaligned sheets press unevenly.
Post construction pace: Work steadily. A post that sits partially built for a long time before pressing allows the lower sheets to begin drying unevenly.
Special Situations
Couching onto Dry Boards (Eastern Method)
Japanese and Chinese papermakers traditionally couched wet sheets directly onto wooden boards, then allowed them to dry in place (no press required). This method produces flat, evenly dried sheets without needing felts or a press, but requires smooth, clean boards and a warm drying environment.
Prepare boards by lightly sizing with diluted starch or rice paste — this prevents the sheet from bonding permanently to the wood. The sheet should release cleanly after drying. This technique works especially well for thin, delicate papers where pressing might cause damage.
Repairing a Torn Couch
If a sheet tears partially during couching — not completely, but with a visible tear — do not discard it. Lay the torn section back down carefully, aligning the torn edges. When pressed, the wet fiber will re-bond across the tear. The repair may be visible in the finished sheet but the paper will be usable for rough purposes.
Cold Weather Couching
In cold conditions, wet pulp becomes sluggish and transfers poorly. Keep the vat water warm (not hot — warm) and ensure couching cloths are stored in a warm space between uses. Cold cloths absorb poorly and allow air to be trapped beneath couched sheets.
Maintaining Your Couching Cloths
After a production session, rinse couching felts or cloths in clean water. Dried paper fiber bonded into cloth weave will cause future sheets to stick and tear. Wring out thoroughly and hang to dry in a well-ventilated space. Store folded, not rolled — rolling creates creases that transfer to paper.
Over time, couching cloths accumulate fine fiber and lose absorbency. When a cloth no longer absorbs water evenly — visible as beading or streaking — wash it vigorously in hot water and scrub with a brush to clear clogged fiber. A couching cloth that cannot be restored should be repurposed (as insulation, padding, or raw fiber for papermaking) and replaced.
Couching is a skill learned in the hands, not the mind. Ten minutes of practice teaches more than an hour of reading. Start with thick pulp and coarse cloth where margins for error are wide, and work your way toward finer sheets as your technique develops.