BVG Bauer-Verfahrenstechnik-GmbH was given the order for an additive handling system because BVG could present a convincing concept. The different chemicals would be delivered in powder or liquid form to the unloading bays and stored in tanks and silos. The additives would then be measured out via a computer controlled recipe manager making the delivery process fully automated.


Wet End Starch

The BVG-Super-Jet, a continuous starch cooker, with more than 300 units in service to date, forms the heart of the wet-end starch plant. At Rhein Papier a cationic wet-end starch is used. The starch is delivered by truck in powder form and stored within a silo of 200m³ (52,834gal). Slurry make down is done continuously directly underneath, within the silo frame work. BVG regulates slurry concentration at a set point of 8% d.s., with a maximum deviation of ± 0.15% d.s.. The plant covers a production rate of about 550 kg/h. After cooking and preparing final concentration, cooked starch goes directly to the addition point in the wet end - without need of an additional holding tank.

BVG - Super - Jet

Talc

Talc is used to absorb disturbing substances in the wet end. Talc is delivered directly from the holding silo to the mixing tank, which is located below and within the silo framework. Talc and water are mixed together and brought to a constant concentration of 30 % d.s. Ready prepared talc slurry is fed into a storage tank and from there into a ring-main to the addition points. The plant runs discontinuously, capable to produce 24 metric tons/d (26.5 tons/d) of talc powder. To keep the pipe system clean, a closed ball and magazine system are used.

Talc Disperging System

Soap

Soap is supplied directly into the waste paper dissolving drum, helping to separate the printing inks from the paper fibers. Rhein Papier decided here for the most modern preparation plant, the continuous BVG “in - situ” saponification process, because of technological and economical reasons. This system is called BVG-Solumat-SP. The produced soap passes along a mixing trough and goes into the waste paper dissolving drum. Besides the soap, peroxide, silicate, caustic, and hot water will also be added.

BVG - Solumat - SP

Retention Agent, Polyacrylamide (PAM)

PAM (Polyacrylamide) is used as retention agent. It will be delivered in liquid form and prepared on a continuous basis. This technology was chosen, since, at UPM Kymmene PM3 plant in Augsburg, very good results have been achieved with this technology. The plant consists of a storage tank, storage pump, mixing tank, mixing pump, post dilution and filtration station. The product is metered close to the screen in the wet end, at a back-pressure of 12 bar (174psi).

PAM - Plant