Patent Publication Number: US-4220086-A

Title: Lithographic printing process

Description:
This is a continuation of application Ser. No. 762,878, filed Jan. 27, 1977 now abandoned. 
    
    
     The present invention has for its object the use of a novel support for the application of a lithographic printing process. 
     Since the invention of lithography, at the end of the eighteenth century, the only support used for this reproduction process is paper. 
     Original lithographic art, which has regained favor in the past few years, has, itself, always been effected on paper. Lithographies thus created have a well-known characteristic and a particular presentation since they always comprise engraved or embossed borders. They are generally of limited edition with each example being numbered and signed by the artist in the lower margin and with pencil. 
    
    
     The inventor has found that, contrary to all accepted ideas, linen for painting, commonly used by artists, constitutes an excellent support for lithographic printing in black or in colors, and that this support can be treated without any difficulty by commonly used lithographic presses. 
     As used herein, linen for painting, commonly used by artists, is intended to convey a meaning different from the meaning of &#34;paper&#34;. Paper is the conventional material for the well known lithographic process. 
     Linen for painting is the type of canvas material which an artist would use for painting. Such material is distinguishable from paper because paper is not a stretchable material, whereas what is here intended is a stretchable material. It should also be noted that this invention employs linen-type canvas material as distinguished from the prior heretofore known paper for the lithographic process. 
     The linen thus printed can advantageously receive one or more layers of varnish, either in the course of printing, that is to say on the machine, or after, this varnish having a dual aim: to make the ink shine or glisten and to protect the printing from the harmful effects of the sun&#39;s rays. 
     The linen can then be mounted on a frame. 
     The novel product thus obtained presents an aspect very different from lithography on paper, much closer to an oil-painting on linen, while having a truly authentic and original character which color reproductions of works of art, which are produced by photographic means and which are not personally signed by the artist, do not have. 
     The term linen as used herein is intended to designate a firm closely woven cloth of plain weave which can be made in various weights. It is this type of material which is commonly used by artists and is adapted to receive an artist&#39;s painting. Moreover, it is this type of material which can be mounted on a frame and stretched, whereas paper is not mounted onto a frame, nor can paper used for the lithographic process be stretched. 
     Lithographies on linen due to their nature and because they are mounted on frames and are varnished do not require protection by glass.