| 摘要 |
A forming apparatus (10) is disclosed for forming a web from a primary (12), a secondary (14), and a further (16) source of stock. The apparatus includes a looped fourdrinier wire (18) having an upstream (20) and a downstream (22) end. A primary headbox (24) is disposed adjacent to the upstream end (20) of the fourdrinier wire (18) for ejecting the stock (12) from the primary source of stock onto the fourdrinier wire (18) between the ends thereof so that a first ply (26) of the web is disposed on the fourdrinier wire (18). A twin wire former is disposed downstream relative to the primary headbox, the twin wire former (28) including a first (30) and second (32) looped wire which cooperate with each other to define therebetween a twin wire forming section (34). The first wire (30) also defines a preforming zone (36) disposed upstream relative to the twin wire forming section (34). A secondary headbox (38) is disposed adjacent to the preforming zone (36) for ejecting the stock (14) from the secondary source of stock so that a second ply (40) of the web is disposed on the preforming zone (36). The arrangement is such that the second ply (40) is carried by the second looped wire (32) towards and onto the first ply (26). A further looped wire (42) is disposed downstream relative to the twin wire former (28), the further wire (42) cooperating with the fourdrinier wire (18) for forming therebetween a further forming section (44). A further headbox (46) is disposed adjacent to the fourdrinier wire (18) for ejecting stock (16) from the further source of stock so that a third ply (48) of the web is disposed on the second ply (40).
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