A method of mounting an art sheet comprising the steps of:
- (a) making a transparent base plate to have a base plate surface area larger than a surface area of said art sheet, wherein a front and a back thin transparent paper layers are detachably adhered on a front surface and a back surface of said transparent base plate respectively;
- (b) placing said art sheet flatly on said back thin transparent paper layer in such a manner that a periphery space is reserved around said art sheet on said back thin transparent paper layer;
- (c) marking at least a position mark along said art sheet to mark up a positioning location for said art sheet on said back thin transparent paper layer which is detachably adhered on said back surface of said transparent base plate;
- (d) removing said art sheet and turn upside down said transparent base plate;
- (e) tearing off said front thin transparent paper layer from said front surface of said transparent base plate;
- (f) flatly attaching said art sheet on said front surface of said transparent base plate and line up with said position mark provided on said back thin transparent paper layer by adhering a back surface of said art sheet with said front surface of said transparent base plate;
- (g) making a transparent diaphragm with a predetermined pattern thereon, wherein said transparent diaphragm has a diaphragm Surface area larger than said predetermined base plate surface area of said transparent base plate and that a layer oil paper is detachably adhered on a back surface of said transparent diaphragm;
- (h) positioning said transparent base plate with said art sheet attached on said front surface thereof between said oil paper and said transparent diaphragm, wherein said back thin transparent paper layer of said transparent base plate is closely in contact with said oil paper;
- (i) partially uplifting said transparent diaphragm from said oil paper until an end edge of said transparent diaphragm is still remained adhering on said oil paper;
- (j) inserting said adhering end edge of said transparent diaphragm with said oil paper between an upper roller and a lower roller of a calender rollers, wherein said uplifted portion of said transparent diaphragm is laid over an upper portion of said upper roller;
- (k) positioning said transparent base plate with said art sheet attached on said front surface thereof on said oil paper, wherein an end side of said transparent base plate is held to prop between said upper roller and said lower roller of said calender roller;
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- (l) feeding said transparent diaphragm, said oil paper, and said transparent base plate with said art sheet attached thereon between said upper and lower rollers of said calender roller by rotating said upper and lower rollers of said calender roller in opposite direction, so as to evenly press said transparent diaphragm and said transparent base plate together to seal up said art sheet and said front surface of said transparent base plate with said transparent diaphragm;
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- (m) cutting off an excessive portion of said transparent diaphragm which is formed around said transparent base plate.