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I believe it is for protection from punctures.
Steve
E-mail: steve@theframingdepot.com
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posted 1/23/2010 6:51:00 AM
by Steve morkotinis |
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Yes, puncture protection may be the most significant benefit, but a rigid backing board has a damping effect, protecting the canvas from flexing caused by vibrations and impacts. Also, the thicker backing provides better insulation against environmental changes of temperature and humidity.
E-mail: artframe@att,net
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posted 1/24/2010 9:19:00 PM
by Jim Miller |
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While we''re on the subject, glazing of glass or acrylic would further protect the canvas painting from environmental changes and impacts, not to mention protection from airborne contaminants, dirt, abrasions, and other mechanical damage.
E-mail: artframe@att.net
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posted 1/24/2010 9:22:00 PM
by Jim Miller |
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Adhering, stapling, or otherwise fastening rag board (or any other mat board) to the back of a frame will end up being warped or buckled. As the board expands or contracts with changes in humidity it will buckle if fastened securely around the edges. I believe that foamboard or plastic corrugated would be the best materials to use to protect the back of the canvas from punctures and dust accumulatin. There is a product available that allows you to attach these materials without hindering the free expansion/contraction.
E-mail: gregf@frametek.com
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posted 1/26/2010 11:43:00 AM
by Greg Fremstad |
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"...There is a product available that allows you to attach these materials without hindering the free expansion/contraction..."
Yes, I believe it''s called RabbetSpace. It is available from all of the best framing suppliers.
E-mail: artframe@att.net
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posted 1/28/2010 6:53:00 PM
by Jim Miller |
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