Rolls couch

See calender drying (2) paper couch roll dandy roll supercalender. 

At the end of the Fourdrinier wire a couch roll removes more water from the web before it is transferred to the press section. At this point the moisture content of the web is about 80% water (20% consistency, 200g/L). The white water from the Fourdrinier is continuously recycled 1000 kg of stock at 0.5% consistency is reduced to a 25 kg mat (5 kg fibre, 20 kg water) by the time it leaves the wire and 975 kg of white water is recycled to the make-up chest and thence back to the headbox. A 500 tonne a day papermachine recycles some 100 000 m of water a day. 

Fabex. [Vinings Industries] Couch roll ccaosioa inhibitor. 

A Frenchman, J. N. L. Robert, built the first paper machine, patented in 1799. It was driven by one worker using a crank. The diluted pulp contained in a large vat was hurled into a wooden chest by a rotating paddle wheel and directed onto an endless wire screen of laid type. The screen bearing the forming paper web was moved forward, horizontally shaken and passed a pair of couch rolls equipped with... 

Fig. 6.3 Schematic of a forming roll and a suction couch roll (source Voith).

The Fourdrinier former is likely the most widely used forming method employed in modem papermaking. It has proven uniquely versatile in the variety of paper grades it can produce. Wire speeds up to 5000 feet per minute are possible with some lightweight grades. The following description follows the pulp flow fi-om the headbox to the couch roll just prior to the press section. A Fourdrinier wet end is shown in Figure 3. 

The Maestro demanded that the corpse be turned over, so Vasco and I obliged. Face down, it seemed even more widely contorted, and I held one of its ankles lest it roll off the couch. The Maestro examined the entry wound, which was surrounded by a circle of subcutaneous hemorrhage where the hilt had impacted or pressed against the flesh, but the deceased had bled much less on that side. The blood on his leg had come from a stab wound in his calf, which confirmed my vision in the fire. There was a separate patch of blood on the back of his ruff, which was badly cmshed, and his right wrist showed faint subcutaneous bleeding, too recent to date from my blow on it a week ago. 

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