Apart from some of the other problems with these entries, it should be "paperboard":
Paperboard is a heavy layered paper, usually at least 100 lbs per ream or more. It is intended to be a rigid, durable form of paper, often used in packaging. Some examples include: cereal boxes, shoe boxes, paper cups, file folders, noncorrugated liner board and packaging materials. http://www.paperhall.org/info/glossary.html
paperboard noun a type of strong thick cardboard; pasteboard. http://www.chambersharrap.co.uk/chambers/feat...
Main Entry: pa·per·board
: CARDBOARD http://www.merriam-webster.com/cgi-bin/dictio...
Also, some hyphens are missing:
cast-coated paperboard [print.] gussgestrichener Karton
flame-retardant paperboard schwer entflammbarer Karton
wood-free paperboard holzfreier Karton
These two are very dodgy:
coated paper board I [print.] gestrichener Karton
coated paper board II [print.] beschichteter Karton
"Your search - "coated paperboard I - did not match any documents." http://www.google.co.uk/search?hl=en&rls=GGLJ...
("coated paperboard 1" gets five hits, none of which fit with this translation)
same results for "coated paperboard II"
This has a missing hyphen and
cut-size paperboard [print.] der Formatkarton
"cut-size", like "cut-price", would mean the size was reduced.
One Google hit. (None, even, for "cut-to-size paperboard".)