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Strip linings strengthen the edges of the canvas so that they can withstand re-stretching. Both strip lining and patching are less invasive than lining. Another method used in place of lining is loose-lining. Loose-lining is accomplished by stretching a painted image over polyester sailcloth without adhesive between the fabrics. [2]
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.
Canada Post canvas bags Stretching canvas on a canoe. From the 13th century onwards, canvas was used as a covering layer on pavise shields. The canvas was applied to the wooden surface of the pavise, covered with multiple layers of gesso and often richly painted in tempera technique. Finally, the surface was sealed with a transparent varnish.
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The back of a stretched canvas, with keys inserted at the corner, and additional keys off to the side. A tightening key is a small wedge or shim used in the construction of a canvas stretcher frame with expandable joints.
Stretching. The thread is tested for consistent size. Any uneven thickness is stretched out. The resulting thread is reeled into containing 500 yd to 2500 yd. The skeins are about 50 inches in loop length. Dyeing: the skeins are scoured again, and discoloration removed with a sulphur process. This weakens the silk. The skeins are now tinted or ...