
1) Sleeveboard
Found on
https://www.crosswordclues.com/clue/pressboard

Pressboard is a class of cellulose-based material constructed of several layers (plies) of paper which, when compressed using a combination of heat and pressure, form a stiff, dense material in a range of weights. Pressboard has been widely used in traditional school and office products such as spiral-bound notebooks and three-ring binders, but it...
Found on
http://en.wikipedia.org/wiki/Pressboard

• (n.) A kind of highly sized rag paper or board, sometimes containing a small admixture of wood pulp; -- so called because used originally, as now, in presses for pressing and finishing knit underwear.
Found on
http://thinkexist.com/dictionary/meaning/pressboard/

board made normally on an intermittent board machine from pulp of entirely vegetable origin and of high chemical purity. It is characterized by its relatively high density, even thickness, surface smoothness, high mechanical strength, flexibility and electrical insulating properties. For some purposes, the surface may be textured
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=212-06-12
Press'board` noun A kind of highly sized rag paper or board, sometimes containing a small admixture of wood pulp; -- so called because used originally, as now, in presses for pressing and finishing knit underwear.
Found on
http://www.encyclo.co.uk/webster/P/156

a kind of millboard or pasteboard. · sleeveboard.
Found on
https://www.infoplease.com/dictionary/pressboard
No exact match found.