Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
  • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
  • D06P5/003—Transfer printing
  • D06P5/004—Transfer printing using subliming dyes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
  • B41M5/035—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic

Definitions

• the invention relates to a porous transfer web for a sublimation printing process, in which the sublimable substances are transferred in an air stream from the transfer web to the goods to be printed.
• Such a transfer path is required to have a corresponding porosity that allows a desired air flow to pass through it, so that the transfer path can be used for printing on porous materials.
• Most known transmission lines are not porous.
• a color is printed on a non-porous paper web, the web is arranged adjacent to a fabric and then the image from the transfer web is transferred to the fabric by the action of heat on the back of the transfer web, with a vacuum on the opposite Side of the fabric can be applied to pull the color from the transfer path to the fabric.
• Porous transmission lines are already known e.g. from DE-OS 28 15 864. These known transmission lines have a high porosity of 12 to 90 m / min. They are therefore not easy to print on. So you can e.g. Hardly or not at all with the engraved rollers of gravure printing technology and only with difficulty with the screen printing process.
• the transmission according to the invention is much easier to produce sheets whose porosity is between 0.5 and 17.5 cm / sec. lies. It was also found that these new transfer webs with low porosities are very well suited for dyeing and printing so-called three-dimensional textile webs according to the transfer printing method, which is usually carried out in a gas stream in an air stream.
• the invention thus relates to transmission webs, preferably paper webs, which are printed with printing inks containing sublimable dyes.
• sublimable dyes are to be understood both dyes which change to the vapor state at atmospheric pressure between 150 and 200 ° C, as well as those which, e.g. Evaporate at 100-150 mbar and 200 ° -220 ° C. Most of these dyes go into the vapor form without melting (sublimation); some evaporate on or after melting. These dyes are largely known and, if they were not commercially available, can be prepared by known methods.
• the porosity of the web in the unprinted state is such that it has a uniform air permeability of between 0.5 and 17.5 cm / s at 1.25 mbar (ie that it has a lot of air at a pressure drop of 1.25 mbar) from 0.3 to 10.5 m 3 per minute and per square meter).
• the transfer path must be able to release at least 50 7 of the sublimation ink that was printed during the printing process.
• the transmission path according to the invention is particularly suitable for printing on three-dimensional textiles such as carpets, velvet and the like.
• a printed transfer path is arranged on the front of a textile structure and warm air is passed through the transfer path and the fabric to be printed in order to move the color from the transfer path to the textile structure.
• the process takes place continuously in that the textile and transfer path move continuously through an area in which the color transfer is carried out.
• the need for a continuous process using a transfer web requires that the transfer material have widths of at least 0.8 m, preferably 1.40 - 2.0 m and up to 4.0 or 5.0 m for dyeing three-dimensional fabrics is available.
• the transmission line must be strong enough to withstand the continuous process.
• the transmission path must be able to maintain the required operating temperatures for at least 0.5-2 minutes. endure without losing its structural integrity or subject to excessive dimensional changes.
• the transfer path must have a surface that is relatively smooth and continuous and can be printed using the gravure printing process or the so-called screen printing process.
• the transmission path must have a uniform air permeability over the surface of the path.
• the air permeability determined by Frazier, is 0.5 to 17.5 cm / s, preferably 2 to 15 cm / s.
• a certain amount of air is drawn through the paper, the porosity of which is to be measured, at a constant pressure drop of 1.25 mbar; the amount of air (X) is measured, which per unit area in the Unit of time goes through.
• a porosity of, for example, 15 cm / s therefore corresponds to an air volume of 150 liters per m in one second or 9 m 3 / min.
• the transmission path according to the invention has a porous structure such that there is an air permeability of 0.3 to 10.5 m 3 / min . m 2 at 1.25 cm water column. It has an unspecified length because it is used in the continuous printing process. However, it has a width of at least 0.8 m, so that it can be used for printing commercial goods of this width. Sheets in widths of up to 5 m can be used while maintaining the overall shape, ie without losing the structural integrity.
• the tensile strength of the webs according to the invention should have at least 100 g both in the longitudinal and in the transverse direction according to the Elmendorf test ASTM D-689-62, and a tensile strength of at least 60 kg / cm 2 at 230 ° C.
• the transmission path is used at an air flow temperature in the range from 190 ° C to 250 ° C, with the overall structure being retained and without a change in dimension of more than 1/2 7.
• porous papers that have a smooth surface, so that they are best lightly printed using the rotogravure process with an acceptable design of 48 lines / cm.
• Materials with a rough surface such as jute or papers with a greater porosity than that of the present invention, cannot be printed with individual details by the gravure printing process and are not usable.
• the amount of dye released by the transfer path is found to be influenced by the type of binder used.
• binders in the production of the webs according to the invention, which experience has shown that they retain little dye on the paper in the classic transfer printing process.
• binders are the cellulose ethers and esters such as ethyl cellulose or cellulose acetopropionate, cellulose acetobutyrate and the like.
• the transmission paths according to the invention can be produced by practically all continuous printing methods. For example, they can be printed using the screen printing method as well as the indirect gravure printing method, with any colorless spots preferably also being printed with a colorless printing ink which may contain a sublimable optical brightener. They can also be produced using the classic gravure method. With this method, higher amounts of dye can be used than with the indirect method, and the amount of printing ink that is deposited per unit area on the web to be printed is easier to control than with the screen printing method.
• the dyes used for the production of the webs according to the invention are sublimable dispersion dyes which reach the maximum of their transfer curve at temperatures which are higher than 210 ° C. in 30 seconds under pressures which are between 50 and 1000 mbar to reach. Dyes that sublimate more easily, such as the dyes of US Pat. No. 4,088,442, are not recommended. Higher subliming, ie those which are too volatile at 50-100 mbar at 220 ° -230 ° C, will also not provide usable transmission paths. It is therefore necessary to use dyes which are used either in classic transfer printing under atmospheric pressure or under reduced pressure on the so-called vacuum piping, it being advantageous if a less volatile dye is also used with a more volatile dye of the same or a similar color.
• Example 1 According to the gravure printing process, multicolored motifs are printed on a 1.6 m wide paper web made of porous paper with alcoholic printing inks of the following composition:
• the paper obtained, which at 200 ° C has a porosity according to Frazier of 16 cm / sec. can be used as follows:
• the printed side of the paper web is placed on a PAC velor web and 200 ° warm air is pressed through from the back of the paper for 15 seconds in such a way that the paper on the velor creates a contact pressure of 3 mbar. After separating the paper from the velor, the velor web has a brilliant print in various light and wet-fast motifs.
• Example 2 With the same printing inks as in Example 1, 1.6 m wide paper webs are printed using the gravure printing process, which at 200 ° and a pressure drop of 1.25 mbar has a Frazier porosity of 2, 10 and 15 cm / sec. exhibit.
• the paper webs obtained can be used in gas flow transfer for printing on PAC fabrics or, in particular the most porous ones, also for printing three-dimensional textiles made of polyacrylonitrile in real shades.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Coloring (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=4223981

Family Applications (1)

Country Status (2)

Cited By (2)

Families Citing this family (1)

Citations (7)

• 1982
  • 1982-03-19 EP EP82810128A patent/EP0061428A3/fr not_active Withdrawn
  • 1982-03-25 JP JP57046484A patent/JPS57171780A/ja active Pending

Patent Citations (8)

Also Published As

Similar Documents

Legal Events