Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M14/00—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
  • D21H21/42—Ribbons or strips

Definitions

• the present invention relates to a method for producing a paper secured with a tape.
• the crushing of a paper in which a thick ribbon is incorporated generally does not allow the thickness required for the final paper to be obtained.
• the ribbon is flush with one side of the paper in order to produce tactile effects, pronounced crushing of the paper after the incorporation of the ribbon has the effect of reducing these tactile effects and therefore of decreasing the security effect associated therewith.
• An object of the invention is to propose a process for producing a paper secured by a ribbon which, while respecting the required thickness of the paper, allows all the securing characteristics associated with the presence of the ribbon.
• a method comprising the steps of producing a fabric from synthetic fibers having a diameter at least equal to half of a nominal thickness of the fabric to be made, to make a hot crushing of the fabric to bring it to the nominal thickness, to cut the fabric according to a ribbon, and to make a paper from a paper pulp by incorporating the ribbon into the paper.
• the hot crushing of the fabric for example by hot calendering, makes it possible to obtain a ribbon whose thickness is precisely controlled before it is incorporated into the paper pulp, so that the thickness of the final paper obtained can itself be precisely controlled without affecting the characteristics of the ribbon produced beforehand.
• a nonwoven fabric is first of all made from fibers made of polyester having a diameter between 20 ⁇ m and 50 ⁇ m, preferably 30 ⁇ m.
• the mattress obtained is brought to a temperature of 110 ° to cause a partial melting of the fibers and the fiber mattress is subjected to crushing to obtain a nonwoven fabric having a thickness of 30 ⁇ m to 40 ⁇ m for a paper whose l he final thickness is of the order of 90 ⁇ m to 130 ⁇ m.
• the fabric is then cut according to a ribbon preferably having a width greater than 4 mm then a paper is produced from a paper pulp by incorporating the ribbon into the layer of paper pulp deposited on the table or the drum. of the paper making machine.
• the ribbon can either be embedded in the mass of the paper as mentioned in the aforementioned document, or be flush with one of the faces of the paper, continuously or intermittently so as to produce a particular tactile effect, that is to say alternately flush the two sides of the paper.
• the production of a nonwoven fabric makes it possible to vary at will the density of the synthetic fibers used as a function of the diameter of these fibers and as a function of the porosity desired for the final fabric, taking into account the necessary crushing coefficient. to obtain the desired nominal thickness of the fabric.
• the nonwoven fabric is produced according to the invention from synthetic fibers having a diameter at least equal to half. of the nominal thickness of the fabric to be produced and the hot crushing of the fabric is carried out so as to bring the latter to the desired nominal thickness.
• the nominal thickness of the fabric is itself a function of the final thickness of the paper so that the dimensions indicated above which are preferred dimensions- for paper having a thickness between 90 ⁇ m and 130 ⁇ m, will be adapted according to the thickness desired for the paper.
• the method according to the invention can be implemented using any synthetic fiber.
• the adhesion is increased by carrying out on the fabric, before cutting of the latter, a treatment known per se of grafting of molecules by plasma of a gas mixture or coating with a material increasing the adhesion of the pulp fibers to the fabric.
• the basic process according to the invention can be the subject of numerous variants by carrying out various treatments on the fabric which can be applied individually or combined to vary the tactile or visual effects provided by the ribbon after its incorporation into the paper.
• the tactile perception of the ribbon can be modified either by a surface abrasion of the fabric causing the formation of fibrils from the synthetic fibers constituting the nonwoven fabric, or by coating the surface of the fabric with a binder making it possible to bond fibrils, for example silk fibrils obtained by cryogrinding of silk waste.
• the fibrils being arranged either randomly by simple dusting, or in a predetermined arrangement using means for positioning the fibrils such as electrostatic fields.
• the binder applied to the fabric can also be used to fix any other coating product applied in the form of powder, glitter ...
• the tactile effect can also be modified by coating the fabric with expanding ink. ble or by performing the hot crushing of the nonwoven fabric with a calendering roller engraved in relief.
• the fabric can also be subjected to treatments varying the visual characteristics of the ribbon, either by direct observation or by transparency.
• a tape having technical characteristics, for example magnetic properties.
• the fabric is subjected before cutting to a coating by means of a composition comprising an additive such as a soluble dye, a pigment dye, a metallic powder or a magnetic powder, and the corresponding binder.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Paper (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=32309900

Family Applications (1)

Country Status (5)

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Family Cites Families (2)

• 2002
  • 2002-12-02 FR FR0215132A patent/FR2847915B1/fr not_active Expired - Lifetime
• 2003
  • 2003-11-20 EP EP03786031A patent/EP1567719A2/de not_active Withdrawn
  • 2003-11-20 AU AU2003295037A patent/AU2003295037A1/en not_active Abandoned
  • 2003-11-20 WO PCT/FR2003/003432 patent/WO2004061234A2/fr not_active Application Discontinuation
• 2005
  • 2005-05-12 MA MA28280A patent/MA27527A1/fr unknown

Non-Patent Citations (1)

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