| 摘要 |
A method for applying coating material to a moving substrate such as a glass mat web in shingle manufacturing includes conveying the web through a narrow channel and ejecting at least one coating material onto at least one surface of the web as it is conveyed through the channel. In a preferred embodiment, multiple coating materials may be applied to one surface of the web and multiple coating materials may be applied to the other surface of the web. The coating materials may be molten asphalt or other coating materials. The pressure of the coating material is controlled as a function of the line speed of the moving substrate to ensure consistently thick coatings at various speeds, including relatively high speeds, of the web. An apparatus in the form of a slot die is disclosed for carrying out the method of the invention. |
