Porcelain enamel projection blackboard
A blackboard and enamel technology, applied in the field of blackboards, can solve the problems that the blackboard cannot be used as a screen, the picture quality is dim and indistinct, and achieves the effect of protecting eyesight, smooth surface, labor-saving and smooth writing
Inactive Publication Date: 2012-11-14
张德林
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Problems solved by technology
[0004] However, if a projector is used to project an image on an existing blackboard, the image quality is dim and not clear, so the existing blackboard cannot be used as a screen
Method used
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[0029] The enamel projection blackboard of the present invention comprises a metal steel plate 1, which is characterized in that a nickel layer 2, a varnish enamel layer 3 and an enamel surface layer 4 are sequentially distributed upward on the top surface of the metal steel plate 1, and are sequentially distributed downward on the bottom surface of the metal steel plate 1. There is a layer of nickel 2 and a layer of varnish enamel 3 .
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The invention discloses a porcelain enamel projection blackboard, which comprises a blackboard body and a frame which covers the periphery of the blackboard body, wherein the blackboard body comprises a metal steel plate layer. The porcelain enamel projection blackboard is characterized in that a nickel layer, a varnish enamel paint layer and a porcelain enamel surface layer are distributed on the top surface of the metal steel plate in sequence, wherein a nickel layer and a varnish enamel paint layer are downwardly distributed on the bottom surface of the metal steel plate in sequence. The porcelain enamel projection blackboard has the advantages of higher resistance, no damage of the plate surface by normal impact, wear and scratch, fastness of the surface and surface hardness of reaching Vickers 9.5.
Description
technical field [0001] The invention relates to a blackboard, in particular to an enamel blackboard which has both the function of a blackboard and an excellent screen function. Background technique [0002] In the past, blackboards had the functions of writing characters and graphics on the surface with chalk. In order to easily write and erase characters and graphics with chalk, the surface of the blackboard was often thickened when making blackboards. Use a dark color material powder for easy viewing. [0003] However, in recent years, various projectors such as slide projectors and OHPs have been used to project pre-prepared materials on a screen, and to give explanations with side pointers such as pointing sticks. [0004] However, if a projector is used to project an image on an existing blackboard, the image quality is dim and not clear, so the existing blackboard cannot be used as a screen. Contents of the invention [0005] The object of the present invention is...
Claims
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IPC IPC(8): B43L1/06B43L1/10G09B5/02
Inventor 张德林
Owner 张德林