To je greška u proizvodnji premaznih papira - podužne crte, tj. tragovi strugača (noža) kojim se na premaznom stroju nanosi premaz na papir.

NewPage Corporation - Glossary:
blade streak - Also called blade scratch; a very fine line or indentation in the coated surface (less than 1/8" wide), in the machine direction, and varying in length from a few feet to several hundred feet. Streaks can be visible under low angle illumination on the surface or appear less opaque than the general coated area when viewed by transmitted light. This defect can sometimes be observed as an actual cut in the sheet, when the streak is deep enough to sever the sheet. The blade streak, scratch or cut is caused by a piece of fiber, dried coating or coating ingredient, or other foreign material being caught under the blade for a period of time, during the blade coating operation.
(http://www.newpagecorp.com/mpd/home.nsf/Glossary?OpenView&St...


Technical Dictionary - Pulp and Paper Industry (en-de-fr-slo-sh), Industrijski biro, Ljubljana, 1988:
streak (blade streak, air knife mark) - pruga, crta, slijed
streaking - nastajanje crta, nastajanje pruga
blade - strugač, rezač, nož
blade coater - premazivač sa strugačem, premazivač sa nožem
blade coating - premazivanje strugačem
blade scratch - ogrebotine, tragovi noža, tragovi strugača
blade scatch pick - čupanje vlakana pri premazivanju strugačem
hickies - male okrugle mrlje u štampanom/tiskanom materijalu
ink rub - skidanje, brisanje mastila/tinte (sa papira)