Wet End

Wet Break is a paper breaks at the wet end (on wire or press) during papermaking process.Wet End

is a first part of the paper machine consisting of wire part and press part.

Wet End Chemical Additives

Chemical additives added with the stock at the wet end. Following are some of the wet end additives.

Additives	Application
Acids and bases	To control pH
Alum	Control pH, Improves Retention, Attach additives on fibers , Part of Rosin-alum sizing
Coloring chemical (dyes & pigments)	Impart desired color
Defoamers	Kill/control foam to improve drainage & retention
Drainage Aids	Improve drainage (water removal) at wire/press.
Dry Strength Additives (Starches, Gum)	Improves burst, tensile, pick resistance etc.
Fiber Deflocculants	Reduce fiber flocculation and  thus improve formation
Filler (clay, CaCO3, TiO2 etc.)	Improve opacity, printing, surface smoothness etc.
Optical Brighteners	Improve optical brightness
Pitch Control	Prevent deposition & accumulation of pitch
Retention Aids	Improves retention of fibers and fillers
Sizing Chemical ( rosin,  ASA etc.)	To control liquid (water, ink etc.) penetration
Slimicides	Control slime growth and other organisms
Specialty Chemicals	Corrosion Inhibitors, Flame Proofing, Anti-tarnish
Wet Strength Resin	To impart wet strength to such papers as coffee filter