Non la mia specializzazione, ma ci sono molte informazioni al proposito online. Spero ti serva quanto sotto. Ciao!

Il termine corretto è questo, anche se in qualche sito si trova "carta senza legno"

Un grado di carta contenente poca o nessuna pasta di legno meccanica che viene spesso utilizzato per la produzione di carta da ufficio.
http://dizionario-internazionale.com/definitions/?italian_wo...

https://books.google.com/books?id=1gcaFV_SKJoC&pg=PA325&lpg=...


Mechanical paper is made from pulp manufactured by one of several processes in which the wood fibers are separated from logs or chips mechanically, while free sheet paper is made by isolating wood fiber through heat, pressure and chemicals. The term free sheet originated to describe paper that was “free” of mechanical pulp but currently applies to papers that have 10 percent or less mechanical fiber.
http://www.afandpa.org/our-products/paper/printing-and-writi...

Freesheet Paper
Freesheet paper is free of groundwood pulp and has a bit higher brightness (whiter) than groundwood paper. Freesheet starts at a number 3 grade. Magazines commonly use 50#, 60#, 70# text weight freesheet options on the interior and 80#, 100# text weight or 66# cover weight freesheet stock on cover options. Freesheet paper is more costly than Groundwood.
http://www.magazinepublisher.com/paper.html

Uncoated Free-Sheet Grade Structure1

1. An excerpt from the "Grade Profile" column in the April 1991 Pulp & Paper, p.13, reprinted here with permission.

Chemical pulps (sulfate, sulfite, soda, cotton linters, and vegetable fiber) are used to make uncoated free-sheet (or woodfree) papers, with occasional additions of up to 10% mechanical fiber or bleached chemithermomechanical pulps (BCTMP) and recycled fibers
http://cool.conservation-us.org/byorg/abbey/ap/ap07/ap07-1/a...
http://www.burgogroup.com/it/carta/rete-vendita/filiali/burg...

Burgo North America ha sviluppato un completo portfolio di carte patinate senza legno (coated freesheet paper)
http://www.burgogroup.com/it/carta/rete-vendita/filiali/burg...

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Note added at 22 mins (2016-10-19 15:13:10 GMT)
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Oppure:
carta senza pasta di legno

https://www.google.com/?gws_rd=ssl#q="carta senza pasta di l...

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Note added at 26 mins (2016-10-19 15:16:45 GMT)
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http://scuolagaribaldi.altervista.org/CARTA.pdf