Printing – Stenciling – Processes
Patent
1997-08-05
1999-03-02
Yan, Ren
Printing
Stenciling
Processes
1011284, B41M 112
Patent
active
058757120
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates primarily to a method of producing a stencil for use in stencil printing machines for applying to print material a print pattern which corresponds to a pattern formed in the stencil, or for producing an offset plate consisting of electrically insulating material, such as a polyester plate, adapted for use in an offset printer so as to be able to apply to print material a print pattern which corresponds to a pattern formed in the offset plate.
For the sake of simplicity, reference is solely made to a "stencil" in the following description, although the person skilled in this art will be aware of the procedures that are required to enable the invention to be applied adequately in producing a stencil or an offset plate.
The present invention thus relates to a method and apparatus for producing a stencil or the like.
Stencils of the kind to which the present invention refers consist of a stencil frame and a carrier substrate, in the form of a cloth, which is stretched in the frame and which incorporates a pattern.
The invention is effected with the aid of digital information relating to positioning of the pattern and its form on the stencil and stored in computer equipment.
Also used are means connected to said computer equipment and functioning to transfer said pattern-related digital information to a light-sensitive layer applied to the carrier substrate.
BACKGROUND ART
Several different methods of producing a stencil for use in stencil printing machines and different methods for producing offset plates for offset machines are known to the art.
With regard to stencil printing machines, it is known to produce a stencil on the basis of a carrier substrate, such as a cloth stretched in a stencil frame and coated with a special layer of emulsion which forms a light-sensitive layer.
Exposure is effected by illuminating the emulsion layer with a projected image, wherewith illuminated parts of the emulsion layer harden and non-illuminated and non-hardened parts form the pattern, and wherein the non-illuminated and non-hardened parts of the emulsion layer are washed away in a subsequent developing process.
The resultant stencil thus includes exposed pattern-associated parts through which printing paste is able to pass during the printing sequence.
It will be apparent that a method of the aforedescribed kind requires the use of projector equipment, a film as the original, and strong lighting, and that a stencil-producing method of this kind is time-consuming and its associated equipment expensive.
However, the use of large projector equipment enable large stencils to be produced, such as stencils in the order of 2.times.3 metres.
It is also known when producing stencils to illuminate a carrier substrate onto which a light-sensitive layer or a layer of emulsion has been applied with laser beams generated by laser equipment and to produce the pattern concerned by guiding movement of the laser beams along the cloth.
Practical application indicates that the laser method is well-suited for smaller stencils with limited print patterns, small dimensions with regard both to cloth and pattern image, although the requisite laser equipment and control (guide) unit demands a relatively high investment.
With regard to the production of polyester offset plates in particular it is known to coat the polyester material with a light-sensitive emulsion and to expose the emulsion with a pattern in essentially the same way as that described above with reference to stencils for stencil printing machines, and to develop the thus exposed plate so as to form the pattern.
SUMMARY OF THE INVENTION
Technical Problems
When considering the present standpoint of techniques, it will be seen that a technical problem resides in providing with the aid of simple means conditions whereby large stencils can be produced in a simpler manner, i.e. more quickly and with good resolution without requiring the use of relatively large projector equipment or laser equipment.
A technical problem also resides
REFERENCES:
patent: 4226410 (1980-10-01), McIntosh, Sr. et al.
patent: 5156089 (1992-10-01), McCue et al.
patent: 5274397 (1993-12-01), Gover
patent: 5511477 (1996-04-01), Adler et al.
patent: 5580698 (1996-12-01), Andersen
Ericsson Sylve Jack Donald
Nyman Ulf Goran
Colilla Daniel J.
Svecia Screen Printing Systems AB
Yan Ren
LandOfFree
Methods and arrangement for the production of a stencil by a mod does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods and arrangement for the production of a stencil by a mod, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods and arrangement for the production of a stencil by a mod will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-413513