| 摘要 |
In a masking technique used in painting processes, a flexible masking sheet is held in place and in shape by the tension on wires fixed to the sheet. The tension is generated by a tensioning device which acts as a ratchet allowing only increases in tension at room temperature and which loses ratcheting effect at higher temperatures. The tensioning device may employ a wax-actuated clutch which is rigid at room temperature but which gradually loses rigidity, thus slowly releasing tension, as temperature increases. Alternatively, the tensioning device may remain perfectly rigid until a higher temperature prevails. A workpiece can be masked and painted at room temperature and then cured and/or dried at a higher temperature, at which time the mask can be easily removed.
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