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A twin-wire former captures the stock jet from the head box in a converging nip formed between two rolls, which are covered by two moving fabrics or wires. They are also sometimes referred to as gap formers. Twin-wire former designs have changed and evolved over the years and have developed somewhat differently for different paper and board grades. It is worth noting that the forming section of a paper or board machine, whether fourdrinier, twin-wire, or some other design has a major impact on the fundamental properties of the sheet and the runnability of the machine.