Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M1/00—Inking and printing with a printer's forme
  • B41M1/26—Printing on other surfaces than ordinary paper

Definitions

• the invention relates to a method for printing on materials which cannot be directly printed in transfer printing, electrostatically applying a powdered plastic material to the surface to be printed, which is connected to the base material by heating, whereupon the surface of the plastic coating thus obtained is printed in the transfer printing process.
• the above invention is based on the object, while maintaining the advantages of this known method, to design it in such a way that at least a predetermined partial area of the surface of the base material to be printed is not printed or, if appropriate, is not coated with the powdered plastic material which enables the subsequent transfer printing.
• This task arises, for example, when printing a flat blank made of metal, from which the wall of a cylindrical box is subsequently manufactured.
• the printed rectangular blank is then rolled up in a cylindrical shape and the overlapping side edges of the blank must then be welded or soldered to one another.
• welding or soldering the blank coated with the plastic material is not possible.
• the first solution is characterized in that an electrically non-conductive or poorly conductive medium is applied to a predetermined partial area of the surface of the base material to be printed before the electrostatic powder application.
• an electrically non-conductive or poorly conductive medium is applied to a predetermined partial area of the surface of the base material to be printed before the electrostatic powder application.
• the mass of the electrically non-conductive or poorly conductive medium can be detached from the base material after heating. In the area of this partial area, the base material then forms the surface, which cannot therefore be printed on subsequently.
• the medium can also be removed from the base material with suitable chemicals or also washed off using the transfer printing process, if appropriate with the aid of mechanical release agents, for example rotating brushes.
• the second possibility for solving the object of the invention is that before the electrostatic powder application, a film is glued onto a predetermined partial area of the surface of the base material to be printed, which foil is removed again after the electrostatic powder application and before heating, together with its powder coating. Because the adhesive film is peeled off again before heating, the coating of the adhesive film, if it has taken place at all, has not yet bonded to the adjacent areas of the powder coating and therefore areas with sharp edges can remain uncoated, which then naturally remain unprinted.
• the application of the adhesive film can be accomplished with the aid of a moving carriage which applies the adhesive film to the base material at the predetermined locations.
• a moving carriage which applies the adhesive film to the base material at the predetermined locations.
• an elongated adhesive tape will be used for this, namely whenever elongated strips of the base material are to remain unprinted and uncoated.
• the third solution of the object of the invention is characterized in that the powdery plastic material applied electrostatically to the base surface is sucked off again from the surface of the base material on a predetermined partial surface before heating.
• the powdery coating has not yet bonded to the base material and to the laterally adjacent areas of the coating, and areas with sharp edges can therefore be suctioned off with the aid of a suitable suction nozzle.
• the suction nozzle will be positioned with suitable means, for example with optics, a path control exactly over the partial surface or surfaces and moved with the basic material (arches or webs) which is continuously moved through the system.
• the extracted plastic material is fed back to a storage container for the plastic material, where this material can be used again.
• the heating of the base material, including its coating, which takes place anyway during heating, is then used immediately for the transfer printing, so that the transfer printing process does not require any heating of its own or only a small amount of heating.
• Heating the powder coating causes the powder coating to sinter or fuse with the surface of the base material.
• a suitable polyester material will usually be used for the powder coating.

Landscapes

• Application Of Or Painting With Fluid Materials (AREA)
• Printing Methods (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6276202

Family Applications (1)

Country Status (4)

Cited By (2)

Family Cites Families (7)

• 1985
  • 1985-07-19 DE DE19853525824 patent/DE3525824C1/de not_active Expired
• 1986
  • 1986-06-26 EP EP86108714A patent/EP0220376A3/fr not_active Withdrawn
  • 1986-07-16 MA MA20964A patent/MA20736A1/fr unknown
  • 1986-07-17 JP JP16685586A patent/JPS6232075A/ja active Pending

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