Stretcher bar

Last updated
Interior angle of a completed stretcher bar corner showing the slot designed to fit a Corner key. Stretcher bar corner showing tightening slot 051907.jpg
Interior angle of a completed stretcher bar corner showing the slot designed to fit a Corner key.
A fully assembled stretcher bar corner. Two unassembled stretcher bars displaying corner mitre construction. Light stretcher bars assembled disassembled 051907.jpg
A fully assembled stretcher bar corner. Two unassembled stretcher bars displaying corner mitre construction.

A stretcher bar is used to construct a wooden stretcher used by artists to mount their canvases.

Contents

They are traditionally a wooden framework support [1] on which an artist fastens a piece of canvas. They are also used for small-scale embroidery to provide steady tension, affixing the edges of the fabric with push-pins or a staple gun before beginning to sew, and then removing it from the stretcher when the work is complete. Stretchers are usually in the shape of a rectangle, although shaped canvases are also possible.

Construction

Since a stretcher is simply a frame, it can be constructed in a variety of ways. The differences in construction have to do with how the corners are built. Commercially available pre-fabricated stretchers come in segments with interlocking corners, that can be fit together like puzzle pieces. Corner supports can also be made using simple woodworking techniques, however.

In the case of the French stretcher, a mitre joint is used to adhere the corners. "Keys" or small triangle wedges are inserted in the joint after stretching the canvas to give the canvas its final tension. When fastening the canvas, pressure should be distributed evenly around the stretcher to minimize warping due to unequal distribution of pull. Unlike other types of stretchers, the corner joints in French stretchers are not glued or fastened in any permanent way. This allows the canvas to be re-tensioned later, as it has a natural tendency to stretch and sag over time. In contrast, strainer bars stretch canvas in a fixed (non-adjustable) way. The keys became popular in the 19th century. [2]

A simpler form of stretcher employs butt joints to adhere the corners. The joint is pinned and glued into place and can not be expanded after assembly.

Design

The profiles on the stretcher bar should be slightly rounded. This has three advantages:

  1. It allows the framer to see and obtain clear edges on images that have precise borders
  2. It allows the canvas weave to "roll over" the profile rather than snap over a sharp edge which is a major cause of canvas cracking. [3]
  3. It also increases the surface area of the frame, which reduces its friction with the canvas. This will make it easier to pull the canvas and make it more taut. [4]

There are many different stretcher bar profiles, and many different styles of cutting the wood. So it is impossible to say anything is "standard." There are also many big regional differences in the style and cutting of the wood, due to the historical reasons. For the same reasons, the wood used for making stretcher bars differs a lot from country to country depending on the forest that is present. But most stretchers, to avoid warping is made in well dried Nordic pinewood sourced from Scandinavia, Russia, and Canada.

Another way in which stretcher bars can be strengthened is by having a cross brace inserted. It is advised that lengths over 40" or 1m be fitted with a cross brace. By doing this it ensures the wood will not warp and will hang flat.

Uses

The use of stretcher bars in the home print market has become increasingly prominent with inkjet-printed canvas prints becoming more popular in the home. This has given a rebirth to this old technique used in the art market for so many years.

Although artists use blank canvases and pre-stretched canvases in the art business, many photographers use stretcher bars for framing wedding photography and reproduction of photographic prints. Stretcher bars are also used in picture framing when framers are framing things like sport shirts etc. Stretcher bars are used extensively in theatrical productions for framing material backdrops.

When a photographer takes a picture then digitally transfers this onto a canvas via inkjet printing, he then stretches this over a stretcher frame. By wrapping the canvas all the way around the frame, known as gallery wrap, the photographer can then hang his picture on the wall, already framed.

See also

Related Research Articles

<span class="mw-page-title-main">Oil painting</span> Process of painting with pigments that are bound with a medium of drying oil

Oil painting is a painting method involving the procedure of painting with pigments with a medium of drying oil as the binder. It has been the most common technique for artistic painting on canvas, wood panel or copper for several centuries, spreading from Europe to the rest of the world. The advantages of oil for painting images include "greater flexibility, richer and denser colour, the use of layers, and a wider range from light to dark". But the process is slower, especially when one layer of paint needs to be allowed to dry before another is applied.

<span class="mw-page-title-main">Printmaking</span> Process of creating artworks by printing, normally on paper

Printmaking is the process of creating artworks by printing, normally on paper, but also on fabric, wood, metal, and other surfaces. "Traditional printmaking" normally covers only the process of creating prints using a hand processed technique, rather than a photographic reproduction of a visual artwork which would be printed using an electronic machine ; however, there is some cross-over between traditional and digital printmaking, including risograph.

<span class="mw-page-title-main">Canvas</span> Extremely heavy-duty plain-woven fabric

Canvas is an extremely durable plain-woven fabric used for making sails, tents, marquees, backpacks, shelters, as a support for oil painting and for other items for which sturdiness is required, as well as in such fashion objects as handbags, electronic device cases, and shoes. It is popularly used by artists as a painting surface, typically stretched across a wooden frame.

<span class="mw-page-title-main">Joinery</span> Where pieces of wood are fixed together in an assembly

Joinery is a part of woodworking that involves joining pieces of wood, engineered lumber, or synthetic substitutes, to produce more complex items. Some woodworking joints employ mechanical fasteners, bindings, or adhesives, while others use only wood elements.

<span class="mw-page-title-main">Mortise and tenon</span> Woodworking joint

A mortiseand tenon joint connects two pieces of wood or other material. Woodworkers around the world have used it for thousands of years to join pieces of wood, mainly when the adjoining pieces connect at right angles.

<span class="mw-page-title-main">Digital printing</span> Method of printing

Digital printing is a method of printing from a digital-based image directly to a variety of media. It usually refers to professional printing where small-run jobs from desktop publishing and other digital sources are printed using large-format and/or high-volume laser or inkjet printers.

<span class="mw-page-title-main">Webbing stretcher</span> Upholstery tool

A webbing stretcher is an upholstery tool used to stretch webbing.

<span class="mw-page-title-main">Foamcore</span> Board of paper-faced rigid foam

Foamcore, foam board, or paper-faced foam board is a lightweight and easily cut material used for mounting of photographic prints, as backing for picture framing, for making scale models, and in painting. It consists of a board of polystyrene foam clad with an outer facing of paper on either side, typically white clay-coated paper or brown kraft paper.

<span class="mw-page-title-main">Frame and panel</span> Wood construction in which a panel is enclosed in a rigid frame

Frame and panel construction, also called rail and stile, is a woodworking technique often used in the making of doors, wainscoting, and other decorative features for cabinets, furniture, and homes. The basic idea is to capture a 'floating' panel within a sturdy frame, as opposed to techniques used in making a slab solid wood cabinet door or drawer front, the door is constructed of several solid wood pieces running in a vertical or horizontal direction with exposed endgrains. Usually, the panel is not glued to the frame but is left to 'float' within it so that seasonal movement of the wood comprising the panel does not distort the frame.

<span class="mw-page-title-main">Picture frame</span> Protective and decorative edging for a picture

A picture frame is a protective and decorative edging for a picture, such as a painting or photograph. It makes displaying the work safer and easier and both sets the picture apart from its surroundings and aesthetically integrates it with them.

<span class="mw-page-title-main">Rabbit-skin glue</span>

Rabbit-skin glue is a sizing that also acts as an adhesive. It is a type of animal glue that is essentially refined rabbit collagen. The glue has been used for centuries for stretching and priming canvases for oil painting. It has also been an ingredient in traditional gesso.

<span class="mw-page-title-main">Violin construction and mechanics</span>

A violin consists of a body or corpus, a neck, a finger board, a bridge, a soundpost, four strings, and various fittings. The fittings are the tuning pegs, tailpiece and tailgut, endpin, possibly one or more fine tuners on the tailpiece, and in the modern style of playing, usually a chinrest, either attached with the cup directly over the tailpiece or to the left of it. There are many variations of chinrests: center-mount types such as Flesch or Guarneri, clamped to the body on both sides of the tailpiece, and side-mount types clamped to the lower bout to the left of the tailpiece.

<span class="mw-page-title-main">Gallery wrap</span>

Gallery wrap is a method of stretching an artist's canvas so that the canvas wraps around the sides of the stretcher bar or strainer bars and is secured to the back of the wooden frame.

This glossary of woodworking lists a number of specialized terms and concepts used in woodworking, carpentry, and related disciplines.

<span class="mw-page-title-main">Canvas print</span> Printing of images onto canvas

A canvas print is the result of an image printed onto canvas which is often stretched, or gallery-wrapped, onto a frame and displayed. Canvas prints are used as the final output in an art piece, or as a way to reproduce other forms of art.

<span class="mw-page-title-main">Strainer bar</span>

A strainer bar is used to construct a wooden stretcher frame used by artists to mount their canvases. They are traditionally a wooden framework support on which an artist fastens a piece of canvas. They are also used for small-scale embroidery to provide steady tension, affixing the edges of the fabric with push-pins or a staple gun before beginning to sew, and then removing it from the frame when the work is complete. Strainer bar frames are usually in the shape of a rectangle, although shaped canvases are also possible.

<span class="mw-page-title-main">Tightening key</span>

A tightening key is a small wedge or shim used in the construction of a canvas stretcher frame with expandable joints. The key is inserted into the slotted inside the stretcher bars at the mitered corners of the frame to prevent or adjust sagging. Tightening keys are commonly made in plastic or wood, and are often called corner keys or corner wedges. Tightening keys were introduced in the mid-18th century, making expandable stretcher frames possible.

<span class="mw-page-title-main">Collage</span> Technique of art production using assemblage of different forms

Collage is a technique of art creation, primarily used in the visual arts, but in music too, by which art results from an assemblage of different forms, thus creating a new whole.

The lining of paintings is a process of conservation science and art restoration used to strengthen, flatten or consolidate oil or tempera paintings on canvas by attaching a new support to the back of the existing one. The process is sometimes referred to as relining. Most often a new support will be added directly to the back of an existing canvas. In cases of extreme decay, however, the original canvas may be completely removed and replaced. The height of the practice's use peaked in the late 19th century and in the following years its usefulness has been debated. There are many different factors that influence whether lining a painting will be successful. By paying close attention to an artwork's condition and response to treatment, conservation professionals better understand the lining process and when to apply it.

<span class="mw-page-title-main">Conservation and restoration of paintings</span> Preservation of heritage collections

The conservation and restoration of paintings is carried out by professional painting conservators. Paintings cover a wide range of various mediums, materials, and their supports. Painting types include fine art to decorative and functional objects spanning from acrylics, frescoes, and oil paint on various surfaces, egg tempera on panels and canvas, lacquer painting, water color and more. Knowing the materials of any given painting and its support allows for the proper restoration and conservation practices. All components of a painting will react to its environment differently, and impact the artwork as a whole. These material components along with collections care will determine the longevity of a painting. The first steps to conservation and restoration is preventive conservation followed by active restoration with the artist's intent in mind.

References

  1. "Which Wood Stretcher Bars Are the Best Fit?". ARTnews.com. 2022-04-03. Retrieved 2022-05-03.
  2. Gettens, Rutherford J.; Stout, George L. (1966). "Supports". Painting Materials: A Short Encyclopedia. Dover Publications. p. 229. ISBN   9780486215976. OCLC   518445.
  3. Mayer, Ralph; Sheehan, Steven (1991). The Artist's Handbook of Materials and Techniques (Fifth edition, revised and updated ed.). New York: Viking. ISBN   0670837016. OCLC   22178945.
  4. "How to frame and stretch a canvas?". My Paint by Numbers. Retrieved 2019-05-10.