Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C1/00—Forme preparation
  • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
  • B41C1/145—Forme preparation for stencil-printing or silk-screen printing by perforation using an energetic radiation beam, e.g. a laser

Definitions

• the invention relates to a method for producing cylindrical printing forms for screen printing, in which the stencil material is applied to a screen and removed at a point intended for printing with the aid of a laser.
• the printing form essentially consists of a flat, woven gauze made of plastic or metal threads.
• cylindrical printing forms for rotary screen printing the screen material of which is galvanically produced from nickel.
• a stencil material in liquid form is applied to the screen material using either the doctor blade method or the immersion method. If the stencil material is a photo layer, this is exposed after drying with the interposition of an appropriate slide that contains the pattern to be transferred to the screen material in the form of transparent or opaque patterns. As a result of the exposure, all unexposed parts of the photo layer remain water-soluble or dispersible, while the exposed parts of the photo layer have become water-insoluble.
• the subsequent aqueous development process exposes the screen material to the unexposed areas, while the exposed areas remain on the screen material. This is followed by curing of the photo layer at usually 180 ° C for one hour.
• a disadvantage of this process is that large amounts of water and electricity are required to produce the printing form.
• the air is polluted by the evaporation of solvents and by fission products due to the polymerization of the paint.
• a one- or two-component varnish is applied to the printing form as a stencil material.
• the varnish is burned away using laser beams.
• the invention is therefore based on the object of designing a method of the type mentioned in such a way that a flawless and high-quality drawing is achieved with the printing form produced therewith.
• a solid plastic material is applied as the template material and is attached to the screen by heat treatment or by gluing.
• the application can take place, for example, by spraying on in powder form or by application or by lamination in film form, in particular as a film stocking.
• the layer thickness can be produced very precisely and is then no longer subject to changes.
• the bleeding that occurs in the known methods is no longer possible here.
• the printing forms produced by the process according to the invention are therefore distinguished by excellent drawing.
• plastic materials that are resistant to the chemicals used in textile printing and that can be applied using the powder spray process or in film form or as film stockings are suitable as plastic material.
• thermoplastics such as polyamide are concerned
• the subsequent attachment to the sieve is carried out by heat treatment, that is to say sintering when the plastic material has been sprayed on in powder form, or by the material's own thermoplasticity.
• other plastic materials for example polyester films, they are expediently laminated on using adhesives.

Applications Claiming Priority (2)

Publications (2)

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ID=6313200

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Cited By (1)

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Citations (7)

• 1986
  • 1986-11-05 DE DE19863637642 patent/DE3637642A1/de not_active Withdrawn
• 1987
  • 1987-10-20 EP EP87115340A patent/EP0266622A3/fr not_active Withdrawn
  • 1987-11-02 JP JP27591687A patent/JPS63179742A/ja active Pending

Patent Citations (7)

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