SU143655A1 - Method of making forms of flat printing - Google Patents

Description

Methods are known for producing a form of flat printing by the method of positive copying. These forms are obtained, for example, by contact copying from negatives or positives made on a photographic film, or from negatives made on reflex paper. However, the production of originals by such methods for subsequent copying onto aluminum foil is a laborious, time consuming and expensive process.

In the described method, these drawbacks are eliminated due to the use of the thermofax process for producing a positive image of the original.

The method of making flat printing forms consists in removing the copy on a special heat-sensitive paper made on a transparent base with a transparent white or light yellow thermo-layered paper with the help of the Thermofax, Secretaries model. The resulting thermofax copy is used to make a flat plate on aluminum foil using the known technology.

Obtaining a positive image from the page of a book or magazine does not require making photocopies or stapling on separate sheets or articles. Directly from the page such an image is obtained on heat-sensitive paper by means of the apparatus “Thermofax, model“ Premier.

The described method makes it possible to significantly speed up the production of originals and, consequently, printed forms when printing non-critical small editions. According to the author's calculations, a thermofax copy on heat-sensitive paper is obtained in just 4 seconds, while it takes 0.43 hours to produce one negative on a photo film, i.e., it is 390 times more nos. 143655-2more, and the legative on reflex paper - 0.21 hours or 190 times longer. Compared with the process of obtaining a positive on a phototechnical film, the tert-u1fax process gives a time gain of more than 400 times. “.

In addition, the thermophysic process is carried out at normal refreshment, dry, i.e., Bose: the use of any chemicals, which reduces labor intensity, increases labor productivity, improves the hygienic state of production and reduces the cost of production. So, for example, the cost of one negative original on a phototechnical film is 14 kopecks, one negative negative original on reflex paper is 6 kopecks, and one thermofax copy is one tenth of a penny. In addition, a large number of expensive materials, photographic materials and chemicals needed for other purposes are saved. The necessary equipment is very simple in design, does not require highly qualified personnel and large production areas for its service personnel.

The quality of the forms obtained using the thermal process is not worse than the quality of the forms made on the basis of negatives on reflex paper.

Subject invention

The use of a thermofax process to obtain a positive image of the original in the method of making flat printing forms by the method of positive copying.