Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
  • B41M7/02—Dusting, e.g. with an anti-offset powder for obtaining raised printing such as by thermogravure ; Varnishing
• • 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
• • 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
  • B41M1/30—Printing on other surfaces than ordinary paper on organic plastics, horn or similar materials

Definitions

• This invention relates to a process for printing onto polypropylene or any other plastics material with similar surface characteristics to polypropylene, which is normally considered unsuitable to accept printing inks satisfactorily, due to its grease-like surface.
• the object of this invention is therefore to provide a process for printing successfully onto polypropylene or other plastics material having similar surface characteristics to polypropylene.
• a process for printing onto polypropylene or other plastics material having similar surface characteristics comprising printing, using normal inks, onto the polypropylene or other plastics surface and then coating the surface and the inked area with a transparent sealant material.
• a sealant material for application to a surface of a polypropylene member or other plastics material having similar surface characteristics, characterised by a mixture of a non-rub material and a hard-dry material.
• the sealant material comprises 20-25% weight of a non-rub material and 20-25% by weight of a hard-dry material and 50-60% by weight of a gloss varnish material.
• the sealant material may comprise 60-85% by weight of a non-rub material and 15-40% by weight of a hard-dry material.
• the sealant material includes a non-rub paste comprising 30% to 35% by weight of a polythene type wax and 65% to 70% by weight of a quick setting varnish to make up the balance.
• these materials comprise 33t% of the polythene type wax and 66 % of the varnish.
• An additive in the form of a hard-dry material is preferably used. This may comprise 2% by weight of cobalt driers, 10% by weight of a wax compound and 88% by weight of china wood oil resin.
• the gloss varnish material where used and which serves as a carrier and results in a gloss finish comprises a resin base with an oil solvent.
• the ink is allowed to dry, at least partially before application of the sealant material.
• sealant material it is found desirable to apply the sealant material at a temperature between 50° and 60° Centigrade, to aid drying.
• the materials chosen include the characteristics, in the case of the non-rub material of providing a non-rub surface finish and in the case of the hard-dry additive of a hard-drying finish and in the case of the gloss varnish, where used, a good gloss surface.
• the process is particularly for printing onto polypropylene sheeting but is also useful for printing onto similar materials which are normally considered impossible to print directly using conventional printing inks.
• Articles such as cassette packages or the cassettes themselves made from polypropylene material may also be printed by means of this process.
• the procedure involves printing by any conventional method using conventional inks onto the polypropylene surface.
• a colour or combination of colours can be applied in exactly the same way as these are applied normally to paper or other materials.
• the printing inks are allowed to dry to a predetermined extent and then the whole surface including the printing area is coated with a sealant material. This is transparent and the film of the sealant material laid down is very thin and therefore substantially indiscernible in the finished article.
• the sealant material may be applied using a roller or by spraying. Alternatively a rubber or other flexible blanket or other conventional means for applying a thin coating to the surface may be used.
• the sealant material comprises a non-rub paste with an additive in the form of a hard-dry material, which serves as a reducing agent, and a gloss varnish.
• the proportions of non-rub, hard-dry and gloss varnish are approximately 20-25% by weight of non-rub material and 20-25% by weight of the hard-dry additive and 50-60% by weight of the gloss varnish material.
• the proportions are preferably 25% non-rub and 25% hard-dry and 50% of gloss varnish material.
• the non-rub paste may comprise 30 to 35% by weight of a polythene type wax and 65 to 70% by weight of a quick setting varnish to make up the remainder.
• the preferred proportions are 331% of the polyurethene type wax and 66 % of the varnish.
• the hard-dry additive may comprise 2% by weight of cobalt driers, 10% by weight of a wax compound and 88% by weight of china wood oil resin to make up the remainder.
• the gloss varnish material which serves as a carrier as well as producing a gloss finish, comprises a resin base including a mixture of gum and synthetic resins. To this is added a hydrocarbon drying oil solvent.
• the temperature should be between 50 and 60° Centigrade to aid rapid drying. It is preferable to premix the non-rub, hard-dry and gloss varnish materials to form the sealant in liquid form prior to application.
• a suitable non-rub paste such as that referred to above is made by Shackell, Edwards & Company Limited and is identified by their Serial No. 2463.
• a hard-dry additive is made by Fishburn Printing Ink Company Limited under their Serial No. XC8228.
• the gloss varnish may be that made by J and C and is identified by their Serial No. 120 H 96659.
• non-rub material and hard-dry material in the proportions 60 to 85% by weight of the non-rub material and 15 to 40% by weight of the hard-dry material, to make up the remainder.
• the preferred proportions in this example are 75% by weight of the non-rub material and 25% by weight of the hard-dry additive material. It is however to be understood that proportions other than those specified may be found to be satisfactory.

Landscapes

• Application Of Or Painting With Fluid Materials (AREA)
• Laminated Bodies (AREA)
• Printing Methods (AREA)
• Sealing Material Composition (AREA)

Applications Claiming Priority (4)

Publications (2)

Family

ID=26285195

Family Applications (1)

Country Status (2)

Citations (7)

• 1984
  • 1984-02-06 EP EP84300706A patent/EP0118993A3/de not_active Withdrawn
  • 1984-02-10 KR KR1019840000644A patent/KR840007679A/ko not_active IP Right Cessation

Patent Citations (7)

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