Printing – Stenciling – Processes
Patent
1995-08-31
1997-11-18
Burr, Edgar S.
Printing
Stenciling
Processes
1011284, B41M 112
Patent
active
056876467
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of producing stencils for use in silk-screen printing.
BACKGROUND ART
A photomechanical process has been used in producing stencils for use in silk-screen printing. According to this process a positive bearing images or letters is applied to an emulsion-coated screen, and the resulting laminated object is exposed to intense light, thereby impressing the images or letters on the screen. An emulsion coating on those areas which have been exposed to the light is hardened by the action of light, and an emulsion coating on the remaining areas which have not been exposed to the light is not hardened. The images or letters which have been transferred from the positive to the screen are developed by washing and removing the emulsion coating which is not hardedned, thereby exposing the fine mesh of the selected areas of the screen in the form of an image or letter pattern. Thus, a stencil having images or letters transfered from the positive is provided for use in silk-screen printing after the screen has been dried.
There are some problem, however, in producing stencils by the photomechanical process. Appropriate positives are difficult to produce; light is liable to leak in the course of exposure; emulsion and other chemical agents smell bad; and an increased number of production steps are required, and accordingly the installation is enlarged, and the working time involved is extended.
Recently the method of producing stencils by a heat-sensitive printer has been widely used because of convenience and advantages of: not requiring such a large installation as in the photomechanical process; requiring no skillfulness; and producing no bad smell.
No matter which process may be used, however, the stencil must be fixed to a frame, and disadvantageously the stencil is likely to deviate from a correct position relative to the frame when the screen is stretched over the frame in fixing to the frame. Even a minute deviation of the screen from the correct position will cause a significant printing drift, and noticeable color drift in case of multi-color printing, thus deteriorating the quality of printing.
In view of these one object of the present invention is to provide apparatus which is guaranteed to be free of these problems, permitting the substantial reduction of working time involved a method of producing stencils for use in silk-screen printing, which method assures that image or letter patterns are put on the screen stretched over the frame at correct positions relative to the frame, not requiring any fine adjustment in positioning and fixing the stencil to the frame as has been hitherto required in conventional methods.
SUMMARY OF THE INVENTION
The method of producing stencils for use in silk-screen printing according to the present invention comprises the steps of: attached thereto; silk to cover the whole area of a platen, which is laid on the flat table; and heat-sensitive film of the screen, thereby producing a frames stencil.
Pores are made to form image or letter patterns in the screen, which is stretched over the frame and is fixed thereto, and therefore, the so formed image or letter patterns are guaranteed to be put in correct positions.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a stencil producing device which is used in producing stencils according to the present invention;
FIG. 2 is a perspective view of a frame for fixing a screen;
FIG. 3 is an enlarged longitudinal section of a screen having a heat-sensitive film;
FIGS. 4(A), 4(B) and 4(C) are longitudinal sections showing how the screen is fixed to the frame;
FIG. 5 is a perspective view of a mechanism for moving a heating head in all directions; and
FIG. 6 shows, partly in section, another manner in which the screen is fixed to the frame.
DESCRIPTION OF THE BEST MODE OF CARRYING OUT THE PRESENT INVENTION
Referring to the drawings, particularly to FIG. 1, a stencil producing device which is used in producing stencils according to the present invention c
REFERENCES:
patent: 1299969 (1919-04-01), Lewis
patent: 3049993 (1962-08-01), Kobrin
patent: 5243906 (1993-09-01), Okusawa
patent: 5491503 (1996-02-01), Fuwa
Burr Edgar S.
Nguyen Anthony H.
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