The primary coater used in the industry for shingle production is the pull-through type. It has several advantages which help to produce a superior roofing product. First, the coating coming directly from the supply pipe is more likely to be of a uniform temperature. Secondly, there is less drag on the reinforcement or carrier as it goes through the machine, resulting in fewer reinforcement breaks and prevention of necking down of the reinforcement or reduction in width. This type of coater is also easier to thread.
There are other advantages. In the pull-through coater the coating can be applied to the substrate through an elongated wire basket which screens out lumps or foreign matter which might block the doctor rolls. Even more important, the coating can be distributed almost the full width of the sheet.
In the pull-through method, an excess of coating can be fed to the substrate and doctored off the edges to help maintain temperature uniformity. The excess coating flows off the sheet edge into the pan to be pumped back into the feed end of the continuous filler mixer, to help maintain temperature control when machine speeds vary.
Please Contact Us to learn more about our Pull Through Coating.