US2672119A

US2672119A - Apparatus for coating webs, including adjustable doctor blade

Info

Publication number: US2672119A
Application number: US243278A
Authority: US
Inventors: Edward W Ertner
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1951-08-23
Filing date: 1951-08-23
Publication date: 1954-03-16
Anticipated expiration: 1971-03-16

Description

March 1954 E. w. ERTNER APPARATUS FOR COATING WEBS, INCLUDING ADJUSTABLE DOCTOR BLADE Filed Aug. 25, 1951 FIG.4

INVENTOR. E. W. E R T N E R ATTORNEY Patented Mar. 16, 1954 APPARATUS FOR COATING WEBS,

IN CLUD- ING ADJUSTABLE DOCTOR BLADE Edward W. Ertner,

Chicago, Ill., assignor to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application August 23, 1951, Serial No. 243,278 7 Claims. (01. 118-118) This invention relates to apparatus for coating webs, and more particularly to apparatus for applying lacquer to webs.

In the manufacture of paper coated with lacquer or the like, on one face thereof, it is customary to apply lacquer to one face of the Web, then spread the lacquer and take off excess lacquer with a doctor blade. In such coating operations it has been very diflicult in the past to apply lacquer between precise margins, particularly if the web being coated shifts somewhat during the coating operation.

An object of the invention is to provide new and improved apparatus for coating webs.

A further object of the invention is to provide new and improved apparatus for applying lacquer to webs.

Another object of the invention is to provide an adjustable doctor blade for spreading coating liquid on a web Within precise limits.

An apparatus illustrating certain features of the invention may include means for applying a band of a predetermined width to one face of a web, and a doctor blade for scraping excess coating from the web and smoothing the coating thereon. Means are provided for distributing the excess lacquer on the doctor blade to increase the width of the band.

A complete understanding of the invention may b obtained from the following detailed description of an apparatus formin a specific embodiment thereof, when read in conjunction with the appended drawings, in which Fig. 1 is a fragmentary, vertical view of a portion of an apparatus forming one embodiment of the invention;

Fig. 2 is a fragmentary, vertical section taken along line 22 of Fig. 1;

Fig. 3 is a fragmentary, perspective view of a doctor roll and supplemental lacquer-feeding means forming a portion of the apparatus, and

Fig. 4. is a perspective view of the supplemental lacquer-feeding means of the apparatus.

Referring now in detail receiving the lacquer from a fountain roll l3, which is continuously rotated and rotates the roll II. The web is advanced from the roll ll under a guide roll and over a roll 16, which is rotated at a peripheral speed opposite that of the web It! so that excess lacquer is wiped from the web 10 on the approach side of the roll I6. The roll 16 is rotated in a groove l1 formed in a holder 18 fastened to a fixed support I9 by screws 20 projecting through slots 2|. The roll I6 is secured to arbors 25 mounted in bearings 26 carried by the support 19 and is rotated by

pulleys

21, 28 and 29 and a belt 30. An edge 3| of the groove I1 is sharp and scrapes excess lacquer from the roll it and drops it back into a tank 32 holding lacquer and onto looped

pins

34 and 35, which project adjustably into grooves 36 and 3'! in the holder 18. The

pins

34 and 35 are slidable in the

grooves

36 and 31 and accumulate and spread lacquer received thereon fromthe roll 16 outwardly therealong to the looped portions thereof on the approach side of the roll 16, so that the web l0 contacts th accumulated lacquer. By adjusting the positions of the

pins

34 and 35, the limits of the portion of the paper to which the lacquer is applied may be closely regulated, and the web may be coated substantially from edge to edge without excess lacquer at the edges thereof. The web 10 is advanced from the roll f5 partially around a drying drum 40, which dries the lacquer, and is rolled into a roll 4|, which is rotated by

rolls

42 and 43 to advance the paper through the apparatus described hereinabove.

Operation The web I 0 is advanced continuously by the

rolls

42 and 43 over the applicator roll II, the doctor roll 16 and the drying drum 4!]. The applicator roll H, which is of a width less than that of the web l0, applies a band equal to the width thereof to the web If] between the edges of the web, the portions adjacent to which are left uncoated to prevent excess lacquer at the edges. As the coated portions of the web are advanced over the roll 16, the roll wipes excess lacquer therefrom and smooths the portions left thereon, and most of the lacquer removed from the web I 0 by the roll l6 falls back into the tank 32 while the portion thereof scraped from the roll l6 at the U-shaped

pins

34 and 35 is accumulated and spread by the pins outwardly therealong. Uncoated portions of the web contact the lacquer accumulated along the pins, which lacquer coats these portions of the web, thereby widening the area of the portion of the web II) which is coated with the lacquer.

The above-described apparatus applies uniform coatings of lacquer in closely controlled widths, and may be adjusted easily even while the apparatus is in operation by sliding the

pins

34 and 35 in the

grooves

36 and 31.

It is to be understood that the above-described arrangements are simply illustrative of the application of the principles of the invention. Numerous other arrangements may be readily devised by those skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is:

l. A coating apparatus, which comprises means for applying a coating liquid to a portion of one face of a web between the edges thereof, a doctor roll for removing a portion of the liquid applied to the face of the web, and means for spreading liquid removed by the doctor run along the doctor roll.

2. An apparatus for applying lacquer to web's, which comprises an applicator roll having a predetermined length, means for advancing the web of paper having a width greater than the length of the applicator roll continuously over the applicator roll to apply lacquer to a predetermined portion of the web, a doctor roll contacting the entire face of the web having the lacquer applied thereto for removing excess lacquer from the portion of the web, and means for diverting excess lacquer removed by the doctor roll outwardly along the doctor roll to Widen the coated portion of the Web.

3. A coating apparatus, which comprises means for applying a coating liquid to a portion of one face of a web intermediate the edges thereof, a doctor roll for removing a portion of the liquid applied to the face of the web, and a guide for spreading liquid removed by the doctor roll along the doctor roll toward the edge of the web and holding the liquid in contact with the web.

4. An apparatus for applying lacquer to webs, w ich comprises an applicator roll having a predetermined length, means for advancing the web of paper having a width greater than the length of the applicator roll continuously over the applicator roll to apply lacquer to a predetermined portion of the web, a doctor roll contacting the entire face of the web having the lacquer applied thereto for removing excess lacquer from the portion of web, and means for scraping lacquer from the doctor roll and diverting the lacquer outwardly along the doctor roll to widen the coated portion of the web.

5. A web-coating apparatus, which comprises means for applying lacquer to one face of a web leaving uncoated edge portions, a grooved roll scraper of a length substantially equal to the width of the coated portion of the web, a doctor roll seated rotatably in the groove in the roll scraper, means for advancing the web continuously from the lacquer-applying means over the doctor roll in a predetermined direction, means for rotating the roll at such a speed and in such a direction that there is a substantial algebraic ifference between the peripheral speed of the roll and the speed of the web, and pins extending along the roll from the scraper for accumulating lacquer thereon to spread the lacquer along the roll to apply the lacquer to the uncoated edge portions of the web.

6. A web-coating apparatus, which comprises means for applying lacquer to one face of a web leaving uncoated edge portions, a grooved roll scraper of a length substantially equal to the width of the coated portion of the web, a doctor roll seated rotatably in the groove in the roll scraper, means for advancing the web continuously from the lacquer-applying means over the doctor roll in a predetermined direction, means for rotating the roll at such a speed and in such a direction that there is a substantial algebraic difference between the peripheral speed of the roll and the speed of the web, and pins mounted adjustably on the scraper and extending along the roll from the scraper in contact with the roll for accumulating lacquer thereon to spread the lacquer along the roll and apply the lacquer to the uncoated edge portions of the web.

'2'. A web-coating apparatus, which comprises caving uncoated edge portions, a grooved roll scraper of a length substantially equal to the width of the coated portion of the web having grooves on opposite sides thereof, a doctor roll seated rotatably in the groove in the roll scraper, eans for advancing the web continuously from the lacquer-applying means over the doctor roll in a predetermined direction, means for rotating the roll at such a speed and in such a direction that there is a substantial algebraic dirlerence between the peripheral speed of the roll and the speed of the web, and U-shaped pins fitting slidaoly in said grooves in the roll scraper and extending along the roll from the scraper for accumulating lacquer thereon to spread the lacquer along the roll to apply it to the uncoated edge portions of the web.

EDVJARD VJ. ERTNER.

References Cited in the file of this patent