
Flong is a term used in relief printing (also called a stereo mould), which refers to an intermediate step in making of a stereo plate typically used in a rotary press though not exclusively. The process was called stereotyping. Invented in Lyon in 1829 by the French printer Claude Genoux, a flong was a papier-mâché mould made with the aid of he...
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http://en.wikipedia.org/wiki/Flong

• imp. & p. p. of Fling. • (n.) A compressed mass of paper sheets, forming a matrix or mold for stereotype plates.
Found on
http://thinkexist.com/dictionary/meaning/flong/

(from the article `printing`) In making stereotype plates, a flong, or mat, a thin sheet of pasteboard, pliant enough to register an impression and sufficiently heat-resistant to ...
Found on
http://www.britannica.com/eb/a-z/f/37
Flong (? or ?), obsolete
imperfect & past participle of
Fling .
Found on
http://www.encyclo.co.uk/webster/F/45
Flong noun [ Of the same origin as
flawn ,
flan , a metal disk.]
(Stereotyping) A compressed mass of paper sheets, forming a matrix or mold for stereotype plates.
Found on
http://www.encyclo.co.uk/webster/F/45

Flong is journalist slang for material that is not urgently topical.
Found on
http://www.probertencyclopaedia.com/browse/ZF.HTM

the material of which a stereotype mold is made.
Found on
https://www.infoplease.com/dictionary/flong
No exact match found.