RU2103178C1 - Hot-stamping foil, method and apparatus for manufacturing thereof - Google Patents

Abstract

FIELD: printing production and branding. SUBSTANCE: foil contains polyethylene, terephthalate film, and coating based on polyvinylacetate (thermoplastic binder), segment, and filler. According to invention, coating is supplemented by polyvinyl alcohol and a surfactant as binding agents, so its composition is as follows (in wt %): polyvinylacetate, 20.6-36.0; polyvinyl alcohol, 1.3-2.4; pigment, 19.2-35.7; filler, 37.6-42.0, and surfactant, 0.3-4.7. Foil is manufactured by initially preparing aqueous suspension of polyvinylacetate-based coating, applying suspension upon polyethylene- terephthalate film, and drying resulting material. Aqueous suspension of component is supplemented with aqueous solution of polyvinyl alcohol, surfactant, and butanol as antifoaming agent. EFFECT: improved quality of hot stamping. 3 cl, 2 dwg

Description

 The invention relates to the production of hot stamping foils of various colors, which can be used in the printing industry, as well as for branding requisites of goods obtained from materials of various nature, such as genuine leather, polymethyl methacrylate, polystyrene and polystyrene copolymers. The foil can be used for marking electrical wires and insulating tubes with insulation made of polyvinyl chloride, fluoroplastic or polyethylene.

 The types of hot stamping foils known to date have been developed for use on specific materials, so the possibility of their use was selective. So, for printing on plastics, a material is proposed consisting of a polymer film and a background layer containing a binder and a pigment, where polystyrene varnish is used as a binder.

 Known hot stamping foil for use in printing, which is made of a polyethylene terephthalate film coated with a thermal coating based on a copolymer of butyl ether of methacrylic acid with amide of methacrylic acid, nitrocellulose and titanium dioxide.

All of the above types of hot stamping foils were obtained using suspensions of coating components in organic solvents. The use of organic solvents creates a fire hazard in the workplace and, in addition,
Attempts have been made to make hot stamping foils using aqueous suspensions of coating components.

The quantitative composition of the components of the coating of white foil hot stamping,%:
Polyvinyl acetate dispersion - 15.85
NB wetting agent - 0.98
Titanium Dioxide - 62.50
Aluminosilicate - 15.7
Milori - 0.026
Dibutyl phthalate - 2.96
Xylitan - 2.0 - 100
The quantitative composition of the components of the coating of black foil hot stamping,%:
Polyvinyl acetate dispersion - 33.83
NB wetting agent - 3.6
Glycerin - 9.73
Chalk - 10.0
Milory - 14.28
Primary green varnish - 14.28
Channel gas soot - 14.28 - 100
(Technological regulations. Color foil series 411 V).

 However, these brands of hot stamping foil had a limited scope, since they were intended for specific materials of the printed surfaces, such as lederin, calico, paper.

 The closest analogue is foil, which is used in printing for binding books with a polyvinyl chloride coating for embossing and is made of a polyethylene terephthalate film with thermal coating based on a polymer binder - a copolymer of vinyl chloride and vinyl acetate, a pigment - carbon black and a filler - chemically deposited chalk.

 The disadvantage is the use of organic solvents.

 A known method of manufacturing a hot stamping foil, comprising preparing a coating based on a thermoplastic binder - polyvinyl acetate, applying a suspension to a polyethylene terephthalate film and drying the resulting material.

 Until now, it has not been possible to produce hot stamping foils of various colors on high-speed equipment without the use of organic solvents for the preparation and application of suspensions of coating components on a polymer film.

 Typically, devices for applying liquid components to a long material include a bath for liquid components, an applicator and squeeze roll. The disadvantage of such devices is the inability to create the necessary pressure in the area of application of the liquid material, which significantly reduces the quality of the resulting material.

 Currently used three-color machine "Color" for the manufacture of hot stamping foil includes a bath with a suspension of coating components, a bathing raster shaft, on which there is an intaglio printing raster, a pressure roller, and a doctor blade. Suspensions of the coating components in organic solvents are satisfactorily applied to the polyethylene terephthalate film at a sufficiently high speed of the film, which is more than 50 m / min. A suspension of the coating components in water cannot be applied to the film at the above film speeds, since a defective coating is obtained. At low speeds of the film - not more than 20 m / min - it is possible to more or less satisfactorily apply a coating of an aqueous suspension to the film, but at the same time the productivity of the equipment is significantly reduced.

 The present invention is the manufacture of high-quality hot stamping foils on high-speed equipment and at the same time ensuring high productivity of the equipment, fire safety of production and environmental ecology.

 The problem is solved due to the fact that the hot stamping foil includes a polyethylene terephthalate film with a thermal coating on it based on a polymer binder, pigment and filler, where polyvinyl acetate in combination with polyvinyl alcohol is used as a polymer binder, titanium dioxide or carbon black combined as a pigment with blue phthalocyanine pigment or pigments of various colors, and as a filler - chemically precipitated chalk or its combination with aerosil. In this case, a hot stamping foil is obtained by using dispersions of the starting components in an aqueous medium with the addition of surfactants.

To obtain a hot stamping colored foil, a PET-M brand film 12 μm thick is used (GOST 24234-80). On the polymer film can be applied pre-wax layer of peat wax or polyethylene wax with a dropping point of at least 82 ^o C.

Polyvinyl alcohol (PVA) of grades B-1H, 18/11, GF (TU 6-11-020-9955-20-99, GOST 10779-76) with a density of 1.20 - 1.40 g / cm ³ at 20 ^o C. In addition, a polyvinyl acetate dispersed coarse dispersion grade D51B, DF 57/15 VP without plasticizer is also used as a polymer binder (GOST 18992-84).

 As a filler in the manufacture of foil, you can use chemically deposited chalk (GOST 8253-79) or its mixture with aerosil. The dispersion of the polymer binder further includes a surfactant, for example, polyoxypropylene (laprol 503) (TU 6-05-16-79-83) in combination with the Rainbow washing powder (TU 10.14.48-91) or a mixture thereof with ammonium polyphosphate "Fakkor" (TU 6-08-495-81). The dispersion of the polymer binder includes butanol as a defoamer (GOST 5208-81). The amounts of all of the listed components used for the manufacture of hot stamping colored foils are presented in table 3.

 Upon receipt of a white foil, titanium dioxide (GOST 9808-84) is used as a pigment, and upon receipt of a black foil, carbon black K-354 (GOST 6220-76) is used as a pigment. To obtain a hot stamping colored foil of various colors, such as blue, red, yellow, green, etc., appropriate dyes are used: blue varnish in combination with turquoise varnish or scarlet pigment in combination with yellow pigment, green phthalocyanine pigment in combination with turquoise varnish and others. Dispersions of thermal coating components are prepared with stirring in water with the addition of surfactants and butanol as an antifoam. The content of the components in the aqueous suspension are shown in table 1.

 The invention is illustrated by the following examples.

Example 1 (the closest analogue). A suspension based on a copolymer of vinyl chloride with vinyl acetate in an organic solvent, including, by weight, is applied onto a polyethylene terephthalate film 12 μm thick at room temperature. %: copolymer 23, pigment - carbon black 38.5 and filler - chalk 38.5. After drying at 90-110 ^° C., a hot stamping foil is obtained.

Example 2 (according to the invention). A white colored suspension is applied to a polyethylene terephthalate film 12 μm thick at room temperature and, after drying at a temperature of 110 - 120 ^° C, a white hot stamping foil is obtained. A white colored suspension is prepared by dissolving 200 g of polyvinyl alcohol (PVA) in 16 L of water while heating to boiling water, followed by cooling of the solution. Then, a polyvinyl acetate acetate dispersion with a concentration of 51% in an aqueous medium in the amount of 3.13 kg and 1 kg of water used to wash off the polyvinyl acetate dispersion from the container for its preparation is added to the resulting solution with stirring. After stirring for 15-20 minutes, a surfactant (polyoxypropylene (laprol 503) in the amount of 0.68 kg and 0.5 kg of water obtained from washing off the specified surfactant from the tank is added to the attritor. After 15 to 20 minutes, 7.2 kg of titanium dioxide and 3.6 kg of chemically precipitated chalk are fed into the attritor with stirring. After loading the dry components, the dispersion is continued for three hours, after which the maximum size of the suspension solid particles is measured (according to the wedge GOST 6589-57). If the degree of milling in the range of 7-10 microns is achieved, 3.0 kg of water is added to the attritor, obtained from washing off the residues of the aqueous solution of PVA from the reactor, and after mashing for 15 to 20 minutes, add a solution of another surfactant - washing powder "Rainbow" based 200 g of powder in 2.0 kg of water, as well as 0.5 water from washing off the residues of this surfactant from the reactor and 2.26 kg of water with a temperature of at least 20 ^o C. Stirring is continued for 15 to 20 minutes, and then into the suspension 0.9 kg of butanol are added and stirred for 15 minutes. Then left at room temperature for 10 to 15 hours to stabilize. Before applying to the film, the resulting suspension must be mixed. Moreover, it should have a temperature not lower than 20 ^o C and the following indicators: conditional viscosity on the viscometer VZ-4 at 20 ^o C 12 - 16 s; the degree of milling ("wedge") 7 - 19 microns. To obtain a hot stamping foil of various colors, the following pigments must be used (table 2).

Example 3. A colorful black suspension is applied to a polyethylene terephthalate film at a thickness of 12 μm at room temperature and, after drying at a temperature of 110 - 120 ^° C, a black hot stamping foil is obtained. A black suspension of black color is prepared by dissolving 188 g of polyvinyl alcohol (PVA) in 16 L of water while heating to a boiling water and stirring, followed by cooling of the solution, after which a polyvinyl acetate dispersion with a concentration of 51% in an aqueous medium in the amount of 3 is added to the resulting solution with stirring , 98 kg and 1 kg of water used to rinse the polyvinyl acetate dispersion from the tank for its preparation. After dispersing for 15-20 minutes, a surfactant (polyoxypropylene (laprol 503) in the amount of 0.82 kg and 0.5 kg of water obtained from washing off the specified surfactant from the tank is added to the attritor. Dispersion is continued for 15 to 20 minutes. After that, another surfactant is fed into the attritor with stirring - ammonium polyphosphate (FACCOR) in the amount of 0.035 kg, and then chemically precipitated chalk is added in the amount of 7.98 kg, water obtained from the flushing of PVA in the amount of 3.0 kg, the blue phthalocyanine pigment in the amount of 0.034 kg and carbon black in the amount of 2.19 kg. As the mixture thickens, add water with a temperature of at least 20 ^o C in an amount of 1.85 kg. Stirring is continued for 4 hours, after which they measure the size of the solid particles of the suspension ("wedge" GOST 6589-57). If the required degree of dispersion is achieved (particle size 7 - 10 microns), the third surfactant is added to the attritor - washing powder "Rainbow" at the rate of 0.268 kg of powder in 2.0 kg of water, as well as 0.5 kg of water obtained from washing the tank, in which prepare a solution of washing powder "Rainbow". Stirring is continued for 15 minutes, after which 1.11 kg of butanol is added to the mixture and stirred for 10 minutes. The mixture is then left at room temperature for 10-15 hours to stabilize. Before applying to the film, the suspension must be moved. Moreover, it should have a temperature not lower than 20 ^o C and the following indicators: conditional viscosity on the viscometer VZ-4 at 20 ^o C 16 - 21 s; the degree of milling ("wedge") 7 - 10 microns.

 Example 4 (according to the invention). On a 12 μm thick polyethylene terephthalate film, a wax layer is preliminarily applied from a solution of a wax composition (SF-3 alloy 85% and brown coal wax 15% crude) in a mixture of solvents: gasoline - toluene in a ratio of 85: 15, while the concentration of the wax solution is 0.2 % After applying the wax layer, any of the listed colorful layers is applied.

The wax solution is applied to the base plate on an Isis-700 machine, drying is carried out at a temperature of 100 - 110 ^o C. The mass of the wax layer is not determined, the quality of the wax layer is determined visually.

 The water-dispersed composition of the paint layer is applied using a raster method at the Colorit installation (LK02LM). In FIG. 1 shows an installation diagram; in FIG. 2 shows a diagram of a raster method for applying a layer of foil. A device for manufacturing hot stamping foils includes a bath 1 for suspension of coating components, a bathing raster shaft 2, a doctor blade 3, a pressure shaft 4 and a tear-off stabilizer 5.

The device additionally contains a stabilizer 5 of the angle of separation of the film made of a plate 6 of stainless steel with a chrome coating in the form of a frame, which is fixed using the holder 7 at an angle of 70 ± 10 ^o to the surface of the raster shaft. The length of the working edge of the stabilizer should be 10 mm less than the width of the film (1300 mm) to prevent the stabilizer from contacting the composition on the surface of the raster shaft. The radius of the working edge of the stabilizer in the cross section should be no more than 1 mm.

 The above materials indicate that a hot stamping foil of various colors and a method for its manufacture using aqueous suspensions of the coating components have been developed, which ensures fire safety of the production and the environment.

 The created device allows you to apply an aqueous suspension of the paint layer of the foil on high-speed equipment, which ensures its high performance.

 The invention will find application in the printing industry, for branding the requisites of shoes, plastics, marking electrical wires and disposable syringes.

The foil obtained according to the invention has the following characteristics:
hiding power complete without spaces;
clarity of prints on a 3-point scale, not less than 3 points;
clarity of stamping in prints on a 3-pole model stamp at a temperature of 85 - 110 ^o C - 3 points, at a temperature of 120 - 150 ^o C - 2 points;
resistance of prints to water, gasoline and mineral oil, not less than - 30 cycles;
resistance of prints to abrasion on wet samples, not less than - 5 cycles;
resistance of prints to light, at least 5 points;
durability of prints to abrasion, in cycles, not less than - 15 cycles.

Claims (3)

 1. Hot stamping foil, including a polyethylene terephthalate film and a coating based on a thermoplastic binder of polyvinyl acetate, a pigment and a filler, characterized in that the coating additionally contains polyvinyl alcohol and a surfactant as a binder in the following ratio of components, wt. Polyvinyl acetate 20.6 36.0
Polyvinyl alcohol 1.3 2.4
Pigment 19.2 35.7
Filler 37.6 42.0
Surfactant 0.3 4.7
2. The foil according to claim 1, characterized in that it further comprises a wax layer located between the polyethylene terephthalate film and the coating based on a thermoplastic binder.  3. A method of manufacturing a hot stamping foil, comprising preparing a coating suspension based on a thermoplastic binder of polyvinyl acetate, applying the suspension to a polyethylene terephthalate film and drying the resulting material, characterized in that an aqueous solution of polyvinyl alcohol, a surfactant and butanol are introduced into an aqueous suspension of coating components as a defoamer in the following ratio of components of the suspension, wt. Polyvinyl acetate 6.0 11.0
Polyvinyl alcohol 0.4 0.7
Pigment 3.2 19.0
Filler 7.0 20.0
Surfactant 0.05 2.5
Butanol 3.2 5.8
Water Else
4. The method according to claim 3, characterized in that the application of an aqueous suspension of the coating components on the polyethylene terephthalate film is carried out after applying a separating wax layer on it. 5. A device for manufacturing a hot stamping foil, comprising a bath for suspension of coating components, a bathing raster shaft, a pressure roller and a doctor blade, characterized in that it comprises a film tear-off stabilizer made of stainless steel with a chrome coating in the form of a frame fixed to using the holder at an angle of 70 ± 10 ^o to the surface of the bathing raster shaft.

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