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CORNER WEDGES KEY
Corner wedges key #: PP2
This corner wedges key suit Gallery wrap and heavy duty,(adapt to item of the stretcher bars is HZF, HDF, HHF)each stretcher feame need 4 pcs of the key.
Corner wedges key #: PP1
This corner wedges key suit standard, (adapt to item of the stretcher bars is SMF, STF, SWF and HSF) each stretcher feame need 8 pcs of the key.
Why we need to ues the corner wedges key?
Loose canvas, All fabric expands and contracts due to hot and cold temperatures. During the course of the day, as the temperature fluctuates, and the fabric expands and contracts. The wood is also expanding and contracting with the ambient moisture in the atmosphere. The force of gravity is pulling constantly. The combination of these forces will cause the fabric to fatigue. This occurs primarily along the edge of the canvas where the canvas and the stretcher make contact.
Now, You can re-stretch the canvas, which is the best option.
you can expand the stretcher bar, there by tightening the fabric. A corner wedges keyed stretcher allows for independent expansion in either direction in each corner.
you can shrink the fabric, making it tighter, by using moisture (water). Each time this method is used, you reduce the elasticity of the fabric.
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