Glossary - International Paper

Porosity - The degree of compactness of the fibers of the paper. It is
an indication of the openness of paper, as measured by resistance to
the passage of air through the sheet.
Post-consumer waste - That fraction of the waste stream which has
passed through the hands of an end-user. Ex. one-time used paper
bags, newspapers, office papers.
Pre-consumer waste - That fraction of the waste stream which is
disposed of during conversion to the end-use product. Ex. envelope
clippings, corrugated box plant die clippings, printing press waste.
Pressboard - Manufactured on a wet machine from sulphate pulp,
cotton fiber or a combination of both and finished with a high polish.
Thickness ranges from .031 to .250 of an inch. Principal qualities:
uniform thickness and density, excellent ply adhesion and good forming
and molting properties. Available in a variety of colors.
Press section- Section of the paper machine just after the Fourdrinier.
It takes the wet formed pulp mat and squeezes it under high pressure
in the nip between two mechanical rolls in order to further remove
water.
Process printing - Printing from two or more halftone plates to
produce various colors and shades.
-R-
Rag paper - Historically, paper made with rag pulp. Today it is usually
referred to as cotton fiber paper. It may be made from cotton cuttings
(rags), linters or other waste cotton. End uses are principally high grade
bond, ledger and writing , and papers required for permanent record
purposes.
Ream - 3000 square feet.
Recovery boiler - Process in the kraft recovery system which burns
spent cooking liquor to regenerate sodium sulphide. Additionally, the
dissolved wood components in the black liquor are burned to generate
steam and electricity for the rest of the mill.
Glossary
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contact:
International Paper
Coated Paperboard Business
6420 Poplar Avenue
Memphis, TN 38197
Toll Free: (888) 815-4873