| 摘要 |
A web coating assembly for applying hot melt adhesives or the like as a coating on a web including a structure for mounting either the breast roller or the extrusion head to minimize web breakage at the extrusion head hot melt applying opening. A lead-in wedge is formed between the breast roller and the extrusion head forming lip; a structure is provided for effecting pivotal movement of the extrusion head and breast roller with respect to each other so that the size of the lead-in wedge increases at a greater rate during relative movement between the extrusion head and the breast roller than the distance of the coating thickness determination portion of the extrusion head from the breast roller. If the breast roller is pivotally mounted, the stationary pivot point therefor is located on the same side of the vertical center line of the extrusion head opening as the lead-in wedge, and is located vertically above a horizontal plane passing through the center of the breast roller. If the extrusion head is pivotally mounted, the stationary pivot point therefor is located on the opposite side of the vertical center line of the extrusion head opening as the lead-in wedge and vertically below a horizontal plane passing through the connection point of a lever arm for mounting the head to the head.
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