A MEANS IN THE VAT SECTION OF A VAT MACHINE

摘要

A cylinder-vat unit (1) which has a cylinder mould (2), a vat (4) and a headbox (12) for supply of stock to the vat (4). The vat is arranged upstream of the cylinder mould (2) in such a manner that a downwardly moving part of the envelope surface of the wire-covered cylinder mould is brought into contact with stock in the vat (4) to form a first web. An outer wire (18) is running in a loop over a breast roll (19), through the vat at its bottom wall (8) and then over, while surrounding, a portion of the circumference of the cylinder mould (2). According to the invention a part of the bottom wall (8) of the vat (4) located between the breast roll (19) and the cylinder mould (2) includes a platform (27) supporting the outer wire, said platform (27) being provided with slit means (38) to form one or more drainage passages (41) to form a second web on the outer wire (18). The slit means (38) is arranged at a predetermined distance from a nip (35) located downstream and defined by the outer wire (18) and the cylinder mould (2). The second web is couched with the first web to form a unitary web.