Untitled record

Application filed April 14, 1884. (No model.)

To all whom it may concern:

Be it known that I, Michael Ehret, Jr., a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented 5 certain Improvements in the Manufacture of Tarred Paper, of which the following is a specification.

My invention consists of a mode, described and claimed hereinafter, of producing comio pound webs of paper coated with tar on one side only.

In the accompanying drawings, Figure 1 is 'a sectional diagram illustrating the mode of conducting the first branch of the process, 15 and Fig. 2 an exaggerated sectional view showing the second branch of the process.

Referring to the diagram Fig. 1, a, a', and ri are portions of continuous webs of absorbent paper, which may be of the character 20 known as.“roofing-paper,” and which may be • derived from as many different rolls, the outer webs, d ri, being paper previously tarred.

• The three webs are drawn by pressure-rolls G G' through a coating material of tar, pitch, 25 or asphalt maintained in a heated condition in a trough, B, the webs being apart from each other as they traverse through the mass and converging to the rolls, so that each web shall be exposed to the coating material. The rolls 30 G G', which revolve in the direction of the arrow, compress the three coated webs, which, thus concentrated together, become one threeply compound web, and thus may be directed to and wound round a roller prior to being35 subjected to the second branch of the process, which consists in tearing the said compound web apart, and thereby converting it into two webs each coated with tar on one side only. The separation does not take place where the 40 face of one web was cemented to that of another, but in the middle of the central web, a, the fibers of which are so pulled apart that one half of the said web will adhere to the outer web, ri, and the other half to the other 45 outer web, these two outer web.s having been coated with tar prior to being cemented to the middle web, and hence the tendency of the lat ter to adhere so tenaciously to the outer webs as to permit the separation by the disintegration of the fibers of the. said central web. 50 When the compound web has been thus torn apart, there will be two webs, one face of which is tarred, the opposite face being untarred and presenting a clear paper surface. The paper thus produced may be used for a variety of 55 purposes—for carpet-linings, tor instance, or as a water-proof lining for boxes and chests, or for water-proof wrappings. When extra stout paper of this kind is required, four webs of tarred paper maj' be first combined with a 60 central web of the untarred paper and the compound web separated in the middle of this central web.

In using the term ^;i tar,” I wish it to be understood that it includes pitch, asphaltum, 65 bitumen, or any compound thereof.

As regards the prior state of the art, I may refer to the Patent No. 226,459, April 13,1880, in which two webs placed face to face are passed through a coating material which ad- 70 heres to the exposed surfaces only, so that when the webs are taken apart each will be coated on one side only. I therefore do not claim, broadly, so passing webs or sheets of · paper through coating material that one face 75 only of each web shall be coated; but'