We don't have synonyms for deckel yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are decked, seckel and decel.
(n) :
Alternative form of deckle (instrument in paper-making) [(paper-making, art) A frame or edge which limits the pulp and, consequently, the size of the resulting paper.]
(n) :
Alternative form of deckle (instrument in paper-making) [(paper-making, art) A frame or edge which limits the pulp and, consequently, the size of the resulting paper.]