Western Papermaking: From Vat to Sheet

Western hand papermaking arrived in Europe by way of the Islamic world in the twelfth and thirteenth centuries. By the fourteenth century, mills in Italy and France were producing the laid papers that would define European writing surfaces for the next five hundred years. In Canada, the practice survives primarily as a craft and fine-art activity, concentrated in university book arts programs and independent studios in cities like Toronto, Montreal, and Vancouver.

What follows is a technical overview of the process as it is currently practised — from furnish preparation through to the finished dried sheet.

The Papermaking Furnish

The furnish is the dilute suspension of fibres in water from which the sheet is formed. In Western hand papermaking, the most common fibre sources are cotton linter, recycled cotton rag, linen, abaca (Manila hemp), and occasionally flax straw. Each fibre produces sheets with different characteristics: cotton linter makes a soft, slightly spongy sheet; abaca produces stronger, more dimensionally stable paper; linen yields a slightly harder surface.

Prepared fibres are beaten in a Hollander beater or a Valley beater. Beating time and intensity directly control the degree of fibrillation — the fraying and swelling of individual cellulose fibres that increases bonding surface area when the sheet dries. Over-beaten furnish produces a dense, translucent sheet with reduced porosity; under-beaten furnish forms a weak, loosely bonded sheet with poor formation.

The beaten stock is diluted in a vat — typically a rectangular tank filled with water — to a consistency of roughly 0.1 to 0.5 percent fibre by weight. At this dilution, the fibres disperse freely and can be redistributed with a stick or a wooden agitator before each dip.

Mould and Deckle Construction

The mould is a rigid frame over which a wire surface is stretched. Two types are used in Western papermaking:

• Laid moulds carry a pattern of closely-spaced horizontal laid wires and wider-spaced vertical chain wires. The resulting paper shows the characteristic shadow grid visible when the sheet is held to light.
• Wove moulds use a uniformly woven wire mesh with no dominant directional pattern, producing a sheet with an even texture and no wire shadow.

The deckle is a separate frame that sits on top of the mould during the dip, containing the slurry and defining the sheet's edges. When the deckle is removed, the pulp that seeped slightly under its edges forms the characteristic uneven border known as the deckle edge — a feature prized by printmakers and fine-press publishers.

Traditional mould frames are built from hardwoods resistant to warping and swelling: mahogany and cherry are common choices in North American studios. The wire surface was historically woven from phosphor bronze; stainless steel is now more common for its corrosion resistance. British hand papermaking moulds often use a distinctive joined-corner construction; North American makers frequently use simpler mortise-and-tenon joinery.

The Vatman's Technique

Sheet formation begins with the vatman dipping the mould-and-deckle into the vat at a shallow angle, scooping up a charge of furnish, and lifting the mould horizontally. This movement is followed immediately by the shake — a rapid fore-and-aft and side-to-side motion that redistributes the fibres across the wire surface and closes the formation before drainage begins.

The quality of the shake determines the sheet's formation — the evenness of fibre distribution visible when the dry sheet is held to a light source. An experienced vatman develops a feel for the quantity of shake required for each furnish: heavily beaten stock needs less agitation to close; lightly beaten long-fibre stocks like abaca require a more vigorous and sustained shake before the sheet sets.

Drainage time depends on furnish consistency, mould wire aperture, and ambient temperature. In a typical studio setting, a sheet is drained enough to handle within thirty to ninety seconds. The mould is then passed to the coucher, who transfers the wet sheet to a damp felt.

Couching and Pressing

Couching — derived from the French verb coucher, to lay down — is the transfer of the wet sheet from the wire surface to a textile felt. The mould is inverted over a pre-wetted felt in a single smooth rolling motion. The sheet releases from the wire by capillary action, transferring to the felt surface.

Multiple sheets are couched in alternating layers with felts between each one, building a post. When the post reaches a workable height, it is moved to a screw press or hydraulic press and pressed at increasing pressure to expel water. Well-pressed sheets typically reach fifty to sixty percent solid content before being separated from the felts and moved to the drying stage.

Drying and Surface Sizing

Unsized sheets dry relatively flat when hung on lines or laid on smooth boards. The drying method affects the sheet's texture: sheets dried against a smooth metal plate pick up a slight gloss; sheets dried freely develop a natural cockle that must be dampened and pressed out before use.

Unsized paper is highly absorbent — suitable for printmaking techniques that require ink to penetrate the surface, but not for writing or watercolour, where ink spread is undesirable. Surface sizing applies a thin layer of gelatin (often combined with alum) to seal the surface and reduce absorbency.

Traditional gelatin sizing is made by soaking and heating animal-derived gelatin in hot water, then dipping dry sheets briefly into the warm bath and hanging them to dry again. The gelatin fills the surface pores, creating the harder writing surface found in European writing papers and many printmaking papers.

Paper Weight, Grain Direction, and Quality Assessment

Western hand papermakers assess finished sheets by weight (grams per square metre, or gsm), grain direction, pH, and visual formation quality. Grain direction in handmade paper is less pronounced than in machine-made paper — the random fibre orientation from the shake means the sheet has nearly isotropic expansion and contraction with humidity changes, which is one reason handmade papers are preferred for certain conservation and repair applications.

pH testing with indicator strips or a surface pH meter confirms whether the finished paper is neutral or alkaline. Calcium carbonate is sometimes added to the furnish as an alkaline reserve — a precaution that extends the paper's long-term stability by neutralising atmospheric acids over time.

Sheets are inspected against a light table for formation evenness, fibre clumps, and wire marks. Irregular formation in the centre of a sheet typically indicates insufficient shake or uneven furnish consistency; heavy wire shadow in wove paper often indicates a worn or deformed mould wire.