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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 ...
Splined canvas can be restretched by adjusting the spline. Stapled canvases stay stretched tighter over a longer period of time, but are more difficult to re-stretch when the need arises. Canvas boards are made of canvas stretched over and glued to a cardboard backing, and sealed on the backside. The canvas is typically linen primed for a ...
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. The key is inserted into the slotted inside the stretcher bars at the mitered corners of the frame to prevent or adjust sagging.
This was a pair of vertical runners used to raise or lower a long profile of low scenery such as a groundrow, pieces of scenery made of canvas stretched over wood and used to represent items such as water or flowers, through a narrow slot in the stage floor. [12] [5] [10]
This method of stretching and preparing a canvas allows for a frame-less presentation of the finished painting. In contrast, a non-gallery wrap canvas is usually intended to be framed before presentation. The stretcher bars are often thinner, and the canvas can be secured at the sides with staples or tacks as the frame will hide them.
In 2006 Mima launched the Octopus Twin a wrapping machine capable of wrapping 150 pallets per hour. ITW Mima delivered their 3000th Octopus stretch wrapper in 2008. [2] The Octopus is also currently being manufactured for the US market in Canada by ITW Muller. Other Haloila’s wrapping machines include the Cobra, Ecomat and Rolle.