초록 ▼

Disclosed is an applicator for the application of liquid to webs and methods of using it. A web-guide path is defined through the applicator and has an intermediate enlargement. One or more inlets and one or more outlets are provided at the exterior of the applicator and at the enlargement respectiv

Disclosed is an applicator for the application of liquid to webs and methods of using it. A web-guide path is defined through the applicator and has an intermediate enlargement. One or more inlets and one or more outlets are provided at the exterior of the applicator and at the enlargement respectively, which are part of a closed passageway system for the supply of liquid to the enlargement. A slit-like passageway system affords passage of web to the enlargement. An exit passageway with one outlet affords passage of web, to which liquid has been applied, from the enlargement out of the applicator. Means are provided for changing characteristics of the exit passageway whereby selectively to influence the application of liquid to the web. By using such an applicator in which provision is made for changing the size or shape, or both, of the exit passageway, considerable control may be exercised over both the degree of impregnation of the liquid into the web and the thickness of liquid coating on the web.

대표청구항 ▼

An applicator for applying liquid to a web comprising a pair of solid blocks juxtaposed together with one block above the other defining an entrance end and an exit end, at least the bottom surface of the top block defining a recess located nearer to the exit end of said juxtaposed blocks, said rece

An applicator for applying liquid to a web comprising a pair of solid blocks juxtaposed together with one block above the other defining an entrance end and an exit end, at least the bottom surface of the top block defining a recess located nearer to the exit end of said juxtaposed blocks, said recess extending transverse to the path of a web travelling through the applicator a distance at least equal to the width of the web being treated, a bore communicating the recess with a reservoir of coating liquid, first means for holding the pair of blocks spaced apart in the vertical direction and for defining an inlet passageway correlated with the width of the web to be coated, said inlet passageway extending from said recess to the entrance end of said juxtaposed blocks, exit means defining an exit from said recess to said exit end of said juxtaposed blocks, at least one doctor blade mounted on an end of said top block at said exit means to bear on a web exiting therefrom and having a width to extend transverse to said exit means, and side curtain means mounted against the end portions of the doctor blade to reduce the width of the doctor blade so that the coating operation can be conducted with the recess completely filled with coating liquid whereby precise thicknesses of coating can be applied to the surface of the web or impregnated thereinto in a substantially sealed enclosure.