Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J31/00—Ink ribbons; Renovating or testing ink ribbons
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
  • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
  • Y10T428/264—Up to 3 mils
  • Y10T428/265—1 mil or less
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
  • Y10T428/269—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension including synthetic resin or polymer layer or component

Definitions

• the frangible nature of the body material presents many surfaces for light reflectance within the boundaries of a printed character. A desirable sparkle is thereby obtained which often cannot be duplicated by liquid inks.
• the conventional filled ink also remains on the surface of the copy paper to thereby block the surface in a manner which contributes to opacity. Liquid inks differ greatly in this regard since liquid inks tend to penetrate the paper and are thereby toned down by adsorption on to the White copy paper.
• Typewriter ribbons which provide the special print characteristics just described almost always comprise a plastic or paper substrate supporting a layer of a wax or resin based filled ink lightly bonded to the substrate. Those providing the best quality of print completely transfer the ink layer conforming to an image impression to paper or other receptive material and are therefore not capable of reuse. Each successive area of such a transfer medium is generally used, and then the transfer medium must be discarded.
• a primary deficiency of the prior art filled ink transfer mediums is therefore complete lack of reusability when the transfer medium is formulated and designed to produce high print quality. It is the primary object of this invention to provide a high print quality typewriter ribbon which can be overprinted and similarly reused a plurality of times. Similarly, it is a general object of this invention to provide a transfer medium having improved characteristics beneficial to reuse of the transfer medium.
• a transfer medium which has a resinous supporting area, topped by an area of somewhat random mixing of a resin phase and a filled ink phase; the random area merges with and is topped by an outer area containing substantially only a filled ink.
• a process is devised to achieve the desired product.
• a layer of resin having substantially no transfer material is supported on a temporary substrate. This layer can be quite thin because the temporary substrate will carry most of the mechanical stresses created in the process.
• a layer of the filled ink material dispersed in a solvent for the resin of the resin layer is then deposited on the resin layer, and the solvent is then driven off. An intermiXing takes place because the solvent initially dissolves significant amounts of the resin. An excess of filled ink over the amount of ink mixed with the resin dissolved in the process is provided so that a substantial portion of the filled ink will be left on the outer surface. In this manner the product desired is obtained.
• the outer surface of the resin is undoubtedly jagged and otherwise irregular. This tends to grasp or lock around the filled ink. In this manner the transfer layer is held from working off or flaking during the normal handling of the transfer medium.
• the final product obtained is about as thin as the prior art, high print quality, filled ink ribbons.
• a thin ribbon is benefited both in print quality and by the increased amount of ribbon which can be stored in a typewriter.
• the outer surface has substantially a pure filled ink layer and more filled ink is available from the internal areas of the product. At least the first two strikeovers have been found to be essentially as good in print quality as the print quality obtained by those prior art filled ink ribbons which are considered of the highest quality.
• a transfer medium is known in which liquid ink is held in a bulbous material to replenish the liquid ink held in a spongeous transfer layer of a kind similar to the spongeous transfer layer of this invention.
• a transfer medium is taught in which liquid ink is held in a bulbous material to replenish the liquid ink held in a spongeous transfer layer of a kind similar to the spongeous transfer layer of this invention.
• an essentially solid ink within a transfer layer is taught. Reusability of a filled ink containing transfer layer is believed to be an unsolved problem in the prior art, with the immaterial exception of conventional carbon papers, in which the transfer characteristics of the filled ink are very poor.
• liquid ink mixture may be first compounded.
• Methyl violet base (dyestutf) 3 Liquid mixture of fatty acid esters (Kronisol R9 Product of FMC Corp.) 18
• the above mixture is compounded by simply combining the components and ball milling for a time required to achieve a complete dispersion. No elevation of temperature is required.
• the carbon black will be suspended colloidally.
• the nigrosine oleate is a viscous liquid which dissolves into the fatty acid esters.
• the methyl violet base is a solid material which dissolves into the fatty acid esters. The dispersion obtained will remain indefinitely without setting or other separation.
• liquid ink All of the components of the liquid ink are either liquid vehicles or imaging materials.
• the combination selected is one which will produce an intense, dark color, but not the dull black obtained from using carbon black alone as the imaging material.
• a dispersed, filled ink mixture may then be compounded as follows.
• the ethyl alcohol is then added to the ball mill. Milling is continued at the 120 F. temperature until a permanent fluid mixture is obtained. With a filled ink mixture of two pounds thus may require two hours of milling.
• the wax is not soluble in the alcohol. However, a complete dispersion is obtained. This would be colloidal in nature, at least with regard to the carbon black and the wax.
• the dyes used are soluble in the alcohol and are believed to function in the dispersion as dispersing agents for the insoluble materials. The dispersed, filled ink mixture will remain indefinitely without settling or other separation.
• Final compounding of the product may be by generally conventional apparatus.
• the temporary substrate is a wide,
• pliable roll of polyethylene glycol terephthalate Preferably a nylon film is applied as a solution by a roll coater in a manner generally similar to that described in the above mentioned application Ser. No. 171,188.
• the solvent for the nylon is evaporated by heat and air circulation and the polyethylene glycol terephthalate carrying a solid film of nylon 0.001 inch thick is rolled up at the end of the coater. This bulk roll is progressed through the same coater when desired to continue the fabrication of this preferred embodiment.
• the nylon supported on the temporary substrate is moved for coating of the nylon by the roll coater.
• the coating mixture is the dispersed, filled ink mixture above described. It is applied by the applicator roll in quantities of 7 pounds per ream (500 20" x 30" sheets) of nylon.
• the temporary substrate moves continuously to almost immediately carry the coated nylon into a drying environment. In the drying environment the surrounding air is circulated vigorously and the temperature is initially kept at F. for about one minute. The temperature is then raised to 220 F. for one minute. This completes the drying.
• the alcohol is expelled. Prior to that expulsion, however, the alcohol partially dissolves the nylon (without the temporary substrate the nylon would fail under the stresses of movement in the system). Furthermore, the heat of the drying environment is above a critical point with relation to the wax-liquid ink mixture. An internal reorganization of some kind takes place causing the mixture to solidify.
• the temporary substrate carrying bulk quantities of the finished transfer medium is rolled into a large roll.
• the transfer medium may be easily grasped and peeled or separated from the polyethylene glycol terephthalate. After such separation, the transfer medium may be slit and rolled into typewriter ribbons or cut a otherwise desired.
• the final product is a unitary film of about 0.0015 inch thick.
• One side of the film is essentially pure nylon. This is desirable to add cut resistance to the transfer medium and to prevent the expression of ink from the impacted side of the transfer medium. (A finely divided, inert filler could be added to the pure nylon if, for example, a stiffer ribbon is desired.)
• the filled ink is situated in cavities and openings, or voids.
• On the side opposite the pure nylon a layer of essentially pure filled ink without nylon approximately 0.0005 inch thick exists. The voids communicate filled ink to the side holding the filled ink.
• the surface of the nylon facing this filled ink layer is doubtless somewhat rough, and doubtless projections of the nylon enter into this essentially pure filled ink layer to a significant extent.
• a process to prepare a transfer medium comprising the steps of:
• said liquid ink comprising coloring material dispersed or dissolved in a liquid vehicle, and particles of a high melting point wax with a solvent for said resin at a temperature below the melting point of said Wax, said solvent being a non-solvent for said wax such that said wax particles are dispersed in said solvent,
• a transfer medium produced by the proces comprising the steps of:
• said liquid ink comprising coloring material dispersed or dissolved in a liquid vehicle, and particles of a high melting point wax with a solvent for said resin at a temperature below the melting point of said wax, said solvent being a non-solvent for said wax such that said wax particles are dispersed in said solvent,

Landscapes

• Thermal Transfer Or Thermal Recording In General (AREA)
• Inks, Pencil-Leads, Or Crayons (AREA)
• Impression-Transfer Materials And Handling Thereof (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24109194

Family Applications (1)

Country Status (7)

Cited By (3)

Families Citing this family (1)

Citations (3)

• 1966
  • 1966-02-23 US US529269A patent/US3463697A/en not_active Expired - Lifetime
• 1967
  • 1967-01-23 GB GB3318/67A patent/GB1139861A/en not_active Expired
  • 1967-02-09 BE BE693842D patent/BE693842A/xx unknown
  • 1967-02-16 DE DE1671622A patent/DE1671622C3/de not_active Expired
  • 1967-02-16 SE SE02166/67A patent/SE329637B/xx unknown
  • 1967-02-22 CH CH258367A patent/CH475088A/de not_active IP Right Cessation
  • 1967-02-22 ES ES337154A patent/ES337154A1/es not_active Expired

Patent Citations (3)

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