Brochure
Caustic Addition
Chips are fed via a screwfeeder into the top of a digester where it is mixed with cooking liquor then cooked to a schedule. The cooking liquor,
sodium hydroxide (NaOH) solution, is a caustic chemical used with sodium sulfide to create white liquor. This fluid is used to break down the
lignin that binds cellulosic fibers while in the digester.
Digesting is the process of removing lignin and other non-fibrous components of the wood from the cellulose fibers, which are used to make
paper. Lignin is essentially the glue that holds the wood fibers together. It can rapidly decompose and discolor paper if it is left in the pulp. To
retain end product quality, it is imperative lignin is removed.
Sodium hydroxide is a highly used chemical that requires accurate addition to the wood chips. Poor control can lead to economic loss in
sodium hydroxide solution and can also lead to wood chip degradation.
Cooking
Product Solutions
Product Solutions
10 | Fisher
®
Pulp and Paper Solutions
Cooking
n MAXIMUM FLOW CONTROL V-notch ball contouring provides modied equal percent characteristic for maximum
ow control.
n MINIMAL LOST MOTION Clamped driveshaft ensures minimal lost motion allowing for tight control.
n TIGHT SHUTOFF Heavy duty seal provides tight shutoff.
n EASE OF MAINTENANCE Drop-in-place installation for easy maintenance.
n REDUCED INSTALLATION TIME Flanged valve body design reduces alignment and installation time.
n SMALL ACTUATOR PROFILE Actuator design promotes smaller envelope package size for tight spaces.
Fisher V150 Vee-Ball
™
control valve, FieldQ
™
actuator, and FIELDVUE DVC2000 digital valve controller