US1921313A

US1921313A - Method of preventing offsets

Info

Publication number: US1921313A
Application number: US522989A
Authority: US
Inventors: Edward C Francoise
Original assignee: Kalamazoo Vegetable Parchment Co
Current assignee: Kalamazoo Vegetable Parchment Co
Priority date: 1929-07-29
Filing date: 1931-03-16
Publication date: 1933-08-08
Anticipated expiration: 1950-08-08

Description

Aug, 8, 1933. E. c. FRANCOISE 1,921,313

METHOD OF PREVENTING OFFSETS Original Filed July 29, 1929 IN VE N TOR I Edward Cflmnca/se BY v Patented Aug 8, i933 METHQD 01F PREVENTING QFFSE'ES Edward C. Francoise, Parchment, Mich, assignor to Kalamazoo Vegetable Parchment Company,

Kalamazoo, Mich.

()riginal application July 29, 1929, Serial No. 382,046. Divided and this application March 3 Glaims.

This application is a division of my application for Letters Patent Serial No. 382,046, filed July 29, 1929 and now Patent No. 1,845,260,

dated February 16, 1932.

The main object of this invention is to provide a method of preventing offsets in printing which permits winding very quickly after printing, thereby avoiding the necessity for long drying reaches.

Objects pertaining to details and economies of my invention will definitely appear from the description to follow. The invention is defined in the claims.

The manner of carrying out my invention is clearly illustrated in the accompanying drawing, in which:

Fig. 1 is a diagrammatic view of a printing and treating apparatus employed by me for the practice of my invention in the manufacture of waxed paper.

Fig. 2 is an enlarged fragmentary section through the offset wax applying and chilling means.

In Fig. l I illustrate diagrammatically the steps of my improved method. 1 represents the roll of paper to be printed, 2 the printing machine and 3 the printed roll. Intermediate the printed roll and printing machine I arrange an apparatus for applying liquid parafiin or other suitable wax to the reverse or unprinted side of the web of paper, this apparatus consisting of a wax applying roll 4 which dips into a tank 5, a doctor or distributing blade 6 being provided for the roll.

Immediately at the rear of the wax applying roll is a chilling roll 7 which chills the wax so that the printed wax strip may be immediately wound into a roll, the printed surface being in opposed relation to a waxed surface as the web of paper is wound into the roll. The wax prevents any offset being taken up by the paper and also removes the tendency to offset as the wax does not have an afiinity for the ink.

The second step of my method, as described in my above mentioned application, consists of passing the paper from the roll 3 through a paramn bath 8 between the squeeze'rollers 9 into a chilling bath 10 from whichthe roll is passed over suitable guide rollers to the final roll 11.

In the passage of the printed web through the paraffin bath 8 the offset preventing wax is melted oil the strip and a new coating of wax applied, with the result that the strip is uni- Serial No. 522,989

(Cl. Mill-4116) formly wax coated on both sides and without offsetting.

My improved method is very effective in'preventing ofisets and results in a very substantial economy as the printing and rewinding operation may be very rapid, and there is a great saving in make-ready, that is, it is not necessary to exercise great care in the make-ready to avoid conditions which in ordinary practice would result in objectionable offset. Further, my improved method renders it practical to satisfactorily use lower grades of ink than it is possible to use under the old method.

A further advantage is that less skill is required on the part of printers and workmen.

I have illustrated the manner of carrying out my method mainly in conventional form, but it is believed that this will be found sufiicient to enable those skilled in the art to adapt it to particular installations and conditions.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. The method of preventing offset in printing consisting of printing a web of paper, applying a substantially continuous coating of liquid paraffin exclusively to the reverse side of the web, and next chilling by passing the paraffined side over a cooling roller, and winding into a roll.

2. The method of preventing offset in printing consisting of printing a web of paper on one side, applying a substantially continuous coating of liquid parafhn exclusively to the unprinted side, and next subjecting the paraflin to a cooling medium, and rolling the paper upon itself whereby the printed surface is brought into contact with the paramned surface.

3. The method of preventing offset in printing 95 consisting of printing a web of paper, applying a substantially continuous coating of liquid paraffin exclusively to the reverse side of the web, and next chilling before substantial penetration of the paper by the paraffin, and rolling the web of paper upon itself whereby the printed surface is brought into contact with the paraffined surface.

EDWARD C. FRANCOISE.