发明授权
US5405647A Method for applying granules to a moving coated asphalt sheet to form areas having sharp leading and trailing edges 失效
将颗粒施加到移动的涂覆沥青板上以形成具有尖锐的前缘和后缘的区域的方法

Method for applying granules to a moving coated asphalt sheet to form
areas having sharp leading and trailing edges
摘要:
The method for applying granules to a moving coated asphalt sheet includes selecting blend drop areas on the sheet, the remainder of the sheet comprising background areas, depositing background granule drops on portions of the background areas such that the background granule drops have generally sharp leading edges which define upstream edges of the blend drop areas and have generally fuzzy trailing edges, depositing blend drops on the blend drop areas such that the blend drops have generally sharp leading edges and generally fuzzy trailing edges which overlap the background granule drops, and then depositing background granule drops on remaining portions of the background areas. The generally sharp leading edges of the background granule drops define the trailing edges of the blend drops so that when blend drops which overlap the background granule drops are removed by inverting the sheet, blend drop areas having sharp leading and trailing edges are produced.
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