English to Czech Tech/Engineering Paper / Paper Manufacturing

Úplně si nejsem jist s významem slova "flash", "....after flashing", tedy co se vlastně s výluhem děje:
Jedná se o výrobu papíru.

Kontext:
From separate flash sections of effects 4AB liquor flows to separate flash sections of effects 5AB (from 4A to 5A, from 4B to 5B) and flashes there.

Liquor from 5B flows onwards to separate flash section of effect 6B (from 5A liquor flows to separate weak liquor flash tank) and onwards after flashing to effects 7AB.

Poradíte?