| 摘要 |
A sandwich board is made of sheet plastics material such as polyethylene. The panels are inhibited from warping by inturned flanges along the edges. Along the rising edges the flanges may be permanently inturned by means of a reverse bend. Along the upper edge the flange may be hinged through double coined lines. A lower flange may also be hinged inwardly through double coined lines for rigidity. Braces may be provided on back panel surfaces for rigidity especially on large sandwich boards. The panels may be slightly offset from one another so that the inturned flanges internest. The outer surfaces of the panels are coated over the whole surface with an adherent ink which allows for later printing of information using cheaper conventional inks or paints.
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