Wallpaper: From History to Modern Manufacturing and Quality Assurance

Background

Wallpaper is a decorative covering applied to walls in homes and commercial spaces. While not essential, it is the most popular way to add style, atmosphere, and color to a room. The industry distinguishes between residential and commercial products, each with different weight, backing, and quality requirements. Residential wallpapers are available pre‑pasted or unpasted, and are not subject to mandatory serviceability tests. Commercial grades, however, must have a vinyl surface and meet stringent physical and visual standards set by the Chemical Fabric and Film Association (CFFA).

Four main printing techniques are employed, chosen for their cost‑effectiveness and aesthetic qualities.

History

The earliest European wallpapers date back to the 13th century, featuring painted religious icons. These “domino papers” were a touch of elegance for devout homes and a brightening addition for poorer households. By the 16th century, hand block‑printed wallpapers began to spread among the middle class, mimicking the tapestries of nobility. In the 18th century, fashionable Americans imported wallpapers from France and England, and domestic “paper stainers” emerged in the early 19th century.

Two major challenges limited production until the mid‑19th century: creating long, continuous sheets and printing cost‑effectively. Early methods involved stitching individual sheets, then coating and printing them. The invention of endless paper—continuous strips—alongside the switch from rag to wood pulp backing dramatically lowered costs. By 1870, wood pulp had replaced rag stock, making wallpaper cheaper than paint in the United States.

Advances in printing—cylinder printing replacing block printing—further reduced labor and expenses. Copper cylinders, laser‑etched and chrome‑plated, could print a single color per cylinder, allowing high‑quality, large‑scale production. Today, innovations include new inks, solvents, latex, and vinyl coatings.

Raw Materials

Wallpaper comprises a backing, a ground coat, printed ink, and sometimes paste. Non‑woven backings may be ground wood, wood pulp, or wood pulp blended with synthetic fibers. Woven backings are typically sturdy textiles like drill (heavy cotton). The ground coat—often a colored vinyl or latex—provides color and durability. Inks contain pigment and a vehicle, with solvents such as acetone or water affecting drying time.

Pastes, usually starch‑based, can be applied wet to the backing. Prepasted wallpapers must be re‑wet for adhesion to walls.

Design

New patterns start with sketches by in‑house or freelance designers. After initial approval, a full‑scale color sketch is produced. The chosen printing method then refines the design, creating a printable pattern. A sample “strike‑off” is printed to verify color and repeatability before mass production.

The Manufacturing Process

Making the Paper

• Ground wood sheets are produced by crushing a tree into slurry, yielding an inexpensive backing.
• Wood pulp sheets are made by debarking, chipping, and pulping a tree, then bleaching and, if desired, adding synthetic fibers for texture.
• A mill roll measures 65 in (1.65 m) wide, up to 22,000 ft (6,706 m) long, and weighs roughly one ton. Printers cut it into six sub‑rolls of 21 in (53 cm) wide by 10,000 ft (3,048 m) long.

Coating

• Before printing, the backing receives a ground color. Ground wood sheets are coated with colored vinyl (PVC), with thickness tailored to durability and strippability.
• Wood pulp sheets may receive kaolin clay for drapability, titanium dioxide for opacity, and latex for handling and color consistency.

Printing

Wallpaper can be printed using one of four techniques:

• Surface Printing – Metal rollers with raised rubber patterns transfer ink directly onto the paper.
• Gravure Printing – Each color is applied by a separate copper cylinder etched with the pattern. The process involves multiple rollers, a steel doctor blade, and drying after each color.
• Silk‑Screen Printing – Stencils are made from silk mesh and a photographic negative. Ink is squeegeed through the stencil onto the paper. This method allows limitless colors but is labor‑intensive.
• Rotary Printing – Combines gravure mechanics with photo‑stencil precision. Mesh stencils wrap around tubes, allowing up to 12 colors and a production rate of ~80 yd (73 m) per minute.

Prepasting

• Printed wallpaper is rolled with a wet cornstarch or wheat starch coating and then dried.

Packaging

• Residential rolls are cut from 3,000 yd (2,742 m) to 15 yd (13.71 m) lengths. Commercial rolls come in 30, 45, and 60 yd (27, 41, and 55 m) sizes. Each roll is labeled with run number and hanging instructions before shrink‑wrapping and storage.

Quality Control

The CFFA sets rigorous standards for commercial vinyl‑coated wallcoverings. Papers must pass tests for coating weight, tensile and tear strength, adhesion, abrasion resistance, flame spread, smoke development, shrinkage, heat aging, and stain resistance.

Manufacturers perform visual inspections and spot checks throughout production. Backings are examined for foreign matter or thread count. During printing, continuous visual checks ensure proper adhesion, accurate color, and clean edges. Representative samples undergo physical and visual evaluation before being cut into final rolls.