| 摘要 |
In a process for extrusion coating of substrate webs in which a substrate web (13) is coated with polyethylene (20) extruded through a slotted die (8), the polyethylene is chosen so that it has a melt index of between about 30 dg/min and about 100 dg/min. After coating, the coated web (15) is passed through a nip roll assembly (9) comprising a chill roll (10) and a nip roll (11). In order to minimize necking-in of the extruded polyethylene (20) edge guides (16, 16a) are provided, these being held at a temperature some 50 DEG - 80 DEG C above the melting temperature of the polyethylene, so that the edges of the extruded polyethylene (20) adhere to the edge guides (16, 16a). |
