KR102353718B1 - Post-coating method of flame retardant layer for digital printed matters and appartus thereof - Google Patents

Abstract

The present invention relates to a method and apparatus for coating a flame retardant layer on an actual image, and the method according to the present invention is a composite flame retardant composed of a UV-curable resin monomer, oligomer or thermosetting resin and an organic/inorganic phosphorus flame retardant by a continuous coating device. And, after preparing a flame retardant composition comprising a solvent, a curing agent, and a leveling and antifoaming agent, the print-receiving layer formed on the substrate or the print-receiving layer of the polypropylene synthetic paper is printed on the print-receiving layer by digital printing. Then, the flame retardant composition is applied to the outer surface of the printed layer, and a flame retardant layer having a thickness of 2 to 100 μm is formed by ultraviolet irradiation or thermal curing. In addition to providing effective uniformity, it is possible to uniformly coat the printed layer exposed to the outside of the actual printed product after the actual printing has been completed. For custom printing on demand, it can eliminate the need to replace the flame-retardant and non-flame-retardant fabric rollers depending on the situation.

Description

Method and apparatus for coating after flame retardant layer of live-action printouts

The present invention relates to a method and an apparatus for coating after the flame retardant layer of the actual print, and more particularly, after the flame retardant layer of the actual print for imparting flame retardant, antifouling, waterproof, and discoloration prevention functions to the actual print by digital printing. It relates to a coating method and an apparatus used therefor.

In general, digital printing is a technique for directly printing or outputting computer-generated digital-based images, characters, or patterns of various colors and shapes on various media. Printing can produce a variety of prints in a large amount in a short time.

Therefore, in recent years, the print production trend is changing from the existing mass offset printing to the Print on Demand (POD) market.

This digital printing does not require the production of a printing plate with a concave-convex printing plate in the conventional offset printing of the analog method, and it is possible to reduce purchase and operating costs, and it is possible to quickly provide a small amount of printed matter with high quality according to an order. It has the advantage of being able to print in the size of

The dictionary meaning of the term 'photo printing', which is currently widely used, is 'to print and output the appearance of the real thing as it is on a print medium', but generally output by the digital printing. It is recognized as producing advertisements or other forms through various processing operations, such as banners, banners, shoulder straps, signboards, point of purchase (POP) advertisements, personal items, business cards, leaflets. , catalogs, brochures, flyers, posters, etc. are very wide.

Non-engraving photorealistic output by digital printing includes print target media such as inkjet or laser printer, software, ink dye, and textile fabric, and related pre-treatment chemicals and equipment, and fabric post-processing equipment.

These actual printouts respond to short-term delivery by minimizing the process, which is the advantage of digital printing, and reduce fixed and operating costs, expand design freedom through improved expression of various colors and patterns, and enhance marketing effects using advanced networks and database systems. As described above, it has effects such as reducing the burden of wastewater treatment for undyed dyes and treatment agents, and can efficiently respond to rapid changes in the market and satisfy the needs of various customers because it is possible to produce small quantities of various types efficiently.

In the case of actual printing, not only the width of the printing target material has been diversified due to technological development, but also inks and dyes can be utilized almost without limitation.

Water-based ink is mainly used for banners, banners, or polypropylene synthetic paper mainly used for actual printing, but fabrics such as woven fabrics or synthetic papers do not have good printability, so surface modification is required to improve printability.

Although a wide variety of surface modification methods are used, for example, hydrophilic polymers such as PVA (polyvinyl alcohol) or PVP (polyvinyl pyrrolidone) and special ceramic materials such as alumina sol are used as surface treatment agents. Hydrophilic polymers have limitations in water resistance and chemical conversion quality, and special ceramic materials have excellent performance but high cost.

Therefore, recently, by coating a mixture of aqueous urethane and silica or alumina on the surface of fabric or synthetic paper to form an ultra-fine porous gel film on the surface layer, the reception, adhesion, and absorbency of the printing ink are improved, the bleeding phenomenon is small, and relatively Although printing target media with excellent water resistance and friction properties are widely used, in addition to this, a wide variety of surface-modified fabrics and synthetic papers are used.

However, these conventional surface-modified fabrics used for photorealistic printing are not only vulnerable to fire, but also because the printed layer is exposed on the outer surface, so dust or soot sticks to the surface, making the surface easy to be contaminated, vulnerable to rain, and UV rays in sunlight. There is a problem in that the printed layer is easy to discolor.

On the other hand, in order to solve some of these problems, a fabric in which a laminated protective film is laminated on an exposed printing layer has also been proposed, but the laminated protective film after printing is physically deteriorated by wind and rain and photochemical deterioration by ultraviolet rays. There is a problem that partial peeling may occur.

Conventionally, as a typical prior art with respect to a fabric for actual yarn output having flame retardancy or flame retardancy, the following may be mentioned.

Registered Patent No. 10-0441299 (registration on July 13, 2004) is a sizing woven fabric containing polyester, which is treated with bleach, antistatic agent, and anti-yellowing agent without desizing, scouring or processing, and THPC (tetra Kiss(hydroxymethyl)phosphonium chloride), NaOH, Urea, Triton X, Trimetholol mekamine, Tris(2,3-dibromopropyl)phosphate, a mixture of reactive softener and water After drying, a mixture of silica, acrylic resin, ethylene vinyl alcohol (EVA), urethane resin, polyvinyl alcohol (PVA), and a fixing agent is coated and dried.

In addition, Patent Registration No. 10-0743107 (registered on July 20, 2007) discloses a fabric layer, a flame retardant layer coated with a flame retardant mixed with a resin, a flame retardant, an oil additive, and other solvents on the fabric layer, and a resin on the flame retardant layer and mineral oil fatty acid oil as a filler, TiO ₂ , SiO ₂ as an additive, and an ink absorbent mixed with a solvent. , Aluminum hydroxide, Hexabromocyclododecane, Urea, or Borax is used, and a flame retardant fabric for inkjet practical use is presented by mixing resin, oil, and organic solvent.

In addition, Registered Utility Model No. 20-0324743 (registration on August 18, 2003) discloses a flame-retardant material for inkjet actual use, which is composed of a fabric layer made of flame-retardant yarn and a coating layer containing a hydrophilic resin, absorbent filler and surfactant on it. ) is doing.

In addition, Registered Utility Model No. 20-0349822 (Registered on April 28, 2004) is a dough roller, a dip storage tank containing a dye and a dipping composition, a first guide roller, a second guide roller, a tenter pin, a first coating solution storage tank, and the first We are proposing a manufacturing device for digital printing yarn fabric consisting of a knife coater, a first drying furnace, a cutter and a winding roller, and as a flame retardant and flame retardant, ammonium dibasic phosphate, sodium stannate, ferric oxide, manganese dioxide, antimony trioxide, Halogen compounds such as antimony oxide, antimony pentoxide, urea monophosphate, calcium carbonate, aluminum hydroxide, bromine and chlorine, and group 5 compounds on the periodic table.

However, in all of the above prior art, in addition to the problem that the flame retardant layer is located below the printing layer and the printed layer is exposed on the outer surface, in the actual printing, where custom printing of various types of small quantity production is the main type, for the use of this flame retardant fabric There is a problem in that operation efficiency is lowered because the non-flame-resistant fabric roller must be removed and the flame-retardant fabric roller must be replaced whenever necessary.

Registered Patent Publication No. 10-0441299 (Registered on July 13, 2004) Registered Patent Publication No. 10-0743107 (Registered on July 20, 2007) Registered Utility Model Publication No. 20-0324743 (Registered on August 18, 2003) Registered Utility Model No. 20-0349822 (Registered on April 28, 2004)

Therefore, the first object of the present invention is to provide a method for coating after the flame retardant layer of the actual output for imparting flame retardancy to the printed output on which the actual printing has been completed.

A second object of the present invention is an actual print that can be coated on the printed layer exposed to the outside of the actual print, in addition to the first object, to impart antifouling, waterproof, and weather resistance (discoloration prevention) to the actual print. It is to provide a method of coating after the flame retardant layer.

A third object of the present invention is to provide a method for after-coating the flame-resistant layer of the actual print, which can exhibit high operational efficiency because there is no need to replace and install flame-retardant and non-flame-resistant fabric rollers in on-demand custom printing of small-lot production of various types. will be.

A fourth object of the present invention is to provide a post-coating apparatus for the actual print that can effectively perform the above-described method.

According to a preferred aspect for smoothly achieving the first to third objects of the present invention, (A) with respect to 100 parts by weight of the UV-curable resin monomer or oligomer, red phosphorus, ammonium phosphate or ammonium polyphosphate inorganic phosphorus flame retardant and aromatic 10 to 40 parts by weight of a complex flame retardant comprising a phosphate or haloalkyl phosphate organophosphorus flame retardant, 15 to 40 parts by weight of a solvent, 1 to 5 parts by weight of a curing agent, 0.1 to 3 parts by weight of a leveling and defoaming agent, 0.01 to a photocatalyst 1 part by weight and 0.01 to 5 parts by weight of organic beads, wherein the composite flame retardant comprises an inorganic phosphorus flame retardant: organic phosphorus flame retardant = 1: 0.1 to 10 weight ratio, and the organic beads are silicone resin, polyacrylate, poly At least one organic bead selected from the group consisting of urethane, polyethylene, polypropylene, nylon, polystyrene, and polymethyl methacrylate, with an average particle diameter of 0.1 μm or more to less than 0.5 μm: 1.0 from an average particle diameter of 0.5 μm or more Beads less than μm: preparing a flame retardant composition in which the beads having an average particle diameter of 1.0 μm or more to 10 μm or less are mixed in a weight ratio of 1:0.5-5:0.5-5; (B) a print-out step of forming a print layer by digital printing on the print-receiving layer of a fabric fabric or polypropylene synthetic paper having a print-receiving layer formed on a substrate; and (C) applying the flame retardant composition to the outer surface of the print layer, and curing it by UV irradiation to form a flame retardant layer having a thickness of 2 to 100 μm. .

According to another preferred aspect for smoothly achieving the first to third objects of the present invention, (A) based on 100 parts by weight of the thermosetting resin, an inorganic phosphorus flame retardant of red phosphorus, ammonium phosphate or ammonium polyphosphate and an aromatic phosphate or halo 10 to 40 parts by weight of a complex flame retardant composed of an organic phosphorus flame retardant of alkyl phosphate, 15 to 40 parts by weight of a solvent, 1 to 5 parts by weight of a curing agent, 0.1 to 3 parts by weight of a leveling and defoaming agent, and 0.01 to 1 parts by weight of a photocatalyst and 0.01 to 5 parts by weight of organic beads, wherein the composite flame retardant includes an inorganic phosphorus flame retardant: an organic phosphorus flame retardant = 1: 0.1 to 10 by weight, and the organic beads are silicone resin, polyacrylate, polyurethane, polyethylene , polypropylene, nylon, polystyrene, and at least one organic bead selected from the group consisting of polymethyl methacrylate, with an average particle diameter of 0.1 μm or more to less than 0.5 μm: Beads having an average particle diameter of 0.5 μm or more to less than 1.0 μm : Preparing a flame retardant composition in which beads having an average particle diameter of 1.0 μm or more to 10 μm or less are mixed in a weight ratio of 1:0.5-5:0.5-5; (B) a print-out step of forming a print layer by digital printing on the print-receiving layer of a fabric fabric or polypropylene synthetic paper having a print-receiving layer formed on a substrate; and (C) applying the flame retardant composition to the outer surface of the print layer, and heating and curing it at a temperature of 60 to 160° C. to form a flame retardant layer having a thickness of 2 to 100 μm. A method is provided.

In addition, the application of the flame retardant composition may be uniformly applied under vibration by an ultrasonic transducer of 80 to 150 kHz.

According to a preferred aspect for smoothly achieving the fourth object of the present invention, a frame installed on a die; a supply roller on which the actual output having the printed layer is wound and located on one side of the frame; a guiding roller and a wiping roller supported by a supporter, and a dispersing roller; a spout positioned above the supporter and supplying a flame retardant; a flame retardant recovery tray positioned below the supporter; a drying oven positioned above the frame; It is composed of a product roller located on the other side of the frame: the flame retardant liquid made of the flame retardant composition discharged from the spout while passing through the guiding roller and the wiping roller supported by the supporter and the guiding roller supported by the supporter of the actual print with a printed layer is the dispersion roller It falls in a dispersed state by the and is supplied to the printed layer of the printed matter, and is controlled to a uniform coating thickness by the wiping roller, while the surplus flame-retardant solution is recovered through a recovery tray, and the flame-retardant solution is applied to the printed layer surface A device is provided after the flame-retardant layer coating of the printed output, which is coated with a uniform thickness, is transferred to the upper part of the frame and cured by a drying oven.

Here, the dispersing roller has first and second threaded portions formed on left and right halves, respectively, and the threads of the first and second threaded portions are formed in opposite directions to each other.

According to another preferred aspect for smoothly achieving the fourth object of the present invention, a guiding roller for conveying the actual output having a printed layer; a flame retardant tank in which a plurality of ultrasonic transducers are installed and the flame retardant composition is contained; an application roller for applying the flame retardant of the flame retardant tank to the actual print; a conveying roller adjacent to the application roller for controlling the application thickness of the flame retardant liquid by nip pressing; There is provided an apparatus for coating after the flame retardant layer of the printed output having a UV irradiation curing unit for curing by irradiating ultraviolet rays to the transferred printed output to which the flame retardant is applied.

Here, the ultrasonic transducer may be to oscillate an ultrasonic wave of 80 ~ 150kHz.

The method and apparatus for coating after the flame retardant layer of the actual output according to the present invention provide a flame retardant layer effectively and uniformly to the actual output on which the actual output is completed, and uniformly on the printed layer exposed to the outside of the printed output on which the actual output is completed. Because it can be coated, it gives antifouling, waterproof, and weather resistance (discoloration prevention) to the actual print, and it is possible to eliminate the need to replace and install flame-retardant and non-flame-resistant fabric rollers depending on the situation in custom-made printing for small-lot production of various types. have.

1 is a cross-sectional view of a post-coating apparatus according to a first embodiment for carrying out a method for after-coating a flame retardant layer of a live-action printout according to the present invention.
Fig. 2 is a front view of the dispersing roller in Fig. 1;
Figure 3 is a cross-sectional view of the after-coating apparatus according to the second embodiment for performing the method for after-coating the flame retardant layer of the actual output according to the present invention.

The method for coating after the flame retardant layer of the actual output according to the present invention includes the following steps.

(A) flame retardant composition preparation steps:

10 to 40 parts by weight of a complex flame retardant comprising an inorganic phosphorus flame retardant of red phosphorus, ammonium phosphate or ammonium polyphosphate and an organophosphorus flame retardant of an aromatic phosphate or haloalkyl phosphate based on 100 parts by weight of the UV curable resin monomer, oligomer, or thermosetting resin; 15 to 40 parts by weight of a solvent, 1 to 5 parts by weight of a curing agent, 0.1 to 3 parts by weight of a leveling and defoaming agent, and the composite flame retardant is inorganic phosphorus flame retardant: organic phosphorus flame retardant = 1: Flame retardant containing in a weight ratio of 0.1 to 10 Prepare the composition.

(B) Steps for actual printing:

A print layer is formed by digital printing on the print-receiving layer of a textile fabric or polypropylene synthetic paper having a print-receiving layer formed on the substrate.

(C) curing the flame retardant layer:

The flame retardant composition is applied to the outer surface of the printed layer and cured by ultraviolet irradiation, infrared irradiation, or heating with a heater in a heating oven to form a flame retardant layer having a thickness of 2 to 100 μm.

Application of the flame retardant composition may be performed by various means such as spraying, poring, dipping, etc., and the application thickness may be determined by the adoption of a wiping roller, adjustment of the nip spacing between a set of rollers, or the use of a blade, etc. can be appropriately controlled by

In addition, the application of the flame retardant composition may be uniformly applied in the flame retardant tank under vibration by an ultrasonic transducer of 80 to 150 kHz.

The flame-retardant composition used in the method for coating after the flame-resistant layer of the actual print according to the present invention and the device is formulated in the form of a flame-retardant solution.

First, the flame retardant composition as the flame retardant will be described in detail.

The flame retardant composition is printed on the surface of polypropylene synthetic paper, various paper papers, or woven fabrics that have undergone processes such as singeing, desizing, scouring, bleaching, and fluorescent whitening. Printing target layer formed of various surface modifiers including ceramic materials such as silica, calcium carbonate, or titanium dioxide, various aqueous resins, and mineral oil and solvents for improving the adhesion of printing inks for preventing ink smearing and improving whiteness The formed printing target medium is coated with a coating film thickness of 2 to 100 μm, specifically 10 to 100 μm, as a flame retardant layer and a protective layer on the exposed outer surface of the printed layer of the medium on which the actual output by digital printing is completed.

If the thickness of the flame retardant layer is less than 2㎛, there is a fear that the flame retardant performance is insufficient, conversely, when it exceeds 100㎛, there is a risk of causing a decrease in adhesion to the printing target medium (substrate) and deterioration of the physical properties of the printing target medium have.

The ultraviolet curable resin may be a polyurethane acrylate, an epoxy acrylate, a polyester acrylate, an acrylic acrylate, or an unsaturated polyester known in the art, and specifically may be an acrylic acrylate.

In addition, the thermosetting resin may be a polyurethane, an epoxy resin, a phenol resin, a melamine resin, an alkyd resin, a urea resin, a silicone resin, or a diallyl phthalate resin known in the art, and specifically may be an aqueous polyurethane.

The composite flame retardant is composed of an inorganic phosphorus flame retardant such as red phosphorus, ammonium phosphate, or ammonium polyphosphate and an organic phosphorus flame retardant such as an aromatic phosphate or haloalkyl phosphate.

Examples of the aromatic phosphate include Isopropylphenyl Diphenyl Phosphate (IPPP), Tripheyl Phosphate (TPP), Resorcinol diphosphate (RDP), or Tricresyl Phosphate (TCP). As the haloalkyl phosphate, TCEP (Tris (2-chloroethyl) Phosphate) and the like.

This phosphorus-based flame retardant imparts permanent flame retardancy to the object to be treated, has excellent light fastness, is transparent without changing the color of the coating surface when mixed with resin, and does not contain harmful substances to the human body such as formaldehyde or TBT (tributyl tin). this is high

Most of the phosphorus-based flame retardants are commercially available in various forms such as transparent liquids, powders, or sols, and it is more preferable to use a liquid form of the phosphorus-based flame retardants to impart uniform flame retardancy.

Most of the phosphorus-based flame retardant forms a carbonaceous char when pyrolyzed, and the generation of this char reduces combustible materials and blocks heat by creating a thick barrier on the surface of burning molecules. The action takes place in the condensed phase. Phosphorus is an important condensed phase flame retardant. Phosphorus is thermally decomposed to form phosphoric acid, and phosphoric acid acts as a dehydration catalyst in combustible materials to increase the amount of tea.

On the other hand, red phosphorus acts as a flame retardant by increasing the residual rate after interfering with decomposition during condensation, and the haloalkyl functional group prevents the flame retardant from evaporating or dissolving in water to prevent the flame retardant from being dissolved in water.

It is important to use the composite flame retardant in a weight ratio of inorganic phosphorus flame retardant: organic phosphorus flame retardant = 1:0.1-10, specifically 1:0.5-5.

If the weight ratio is less than 1:0.1, the homogeneity, adhesion, and flexibility of the coating flame retardant layer are inferior, and there is a risk of fine drop-off of the flame retardant layer due to cracks caused by external harmful environments such as wind and rain. If the weight ratio exceeds 1:10, the coating flame retardant layer Flexibility is improved, but there is a risk of insufficient flame retardancy.

In addition, in the present invention, a bromine-based flame retardant, an antimony-based flame retardant, or a silicone-based flame retardant can be further included.

The bromine-based flame retardant has a problem of poor environmental friendliness, but exhibits excellent flame retardancy, and includes tetrabromobisphenol, decabromodiphenyl oxide, hexabromocyclododecane, octabromodiphenyl oxide, bistribromophenoxyethane, and tribromophenol, ethylene bistetrabromophthalimide, brominated polystyrene, ethylene bispentabromodiphenyl, polybromophenyl oxide, and hexabromobenzene.

In addition, the antimony-based flame retardant causes a synergistic effect of the halo flame retardant and the flame retardant, and antimony trioxide or antimony phenoxide is typical.

In addition, as the silicone-based flame retardant, silica gel and hydrophilic aerosol silica can be mentioned, which adsorb the combustion component into the micropores on the surface during combustion, while the generated non-combustible layer exhibits heat insulation and barrier effects, so that high flame retardancy can be obtained.

When the weight of the phosphorus-based flame retardant is 1, they are used in a weight ratio of 0.01 to 0.1, and if the weight ratio is less than 0.01 weight ratio, there is a fear that the expected effect of addition may be insufficient. There is a possibility of masking the printed layer.

On the other hand, the flame retardant composition, optionally, as a photocatalyst TiO ₂ , ZnO, CdS, ZrO ₂ , SnO ₂ , V ₂ O ₃ , WO ₃ , SrTiO ₃ , Alternatively, any mixture thereof may be included in an amount of 0.01 to 1 part by weight based on 100 parts by weight of the UV-curable resin monomer or oligomer, or thermosetting resin to improve surface antifouling and weathering resistance (discoloration prevention) and antibacterial properties.

If the content is less than 0.01 part by weight, there is a fear that the intended effect may be insufficient, and conversely, if it exceeds 1 part by weight, there is a fear that a masking effect may appear on the printed layer.

Also optionally, organic beads made of silicone resin, polyacrylate, polyurethane, polyethylene, polypropylene, nylon, polystyrene, polymethyl methacrylate, or any mixture thereof having an average particle diameter of 0.1 to 10 μm are UV-curable. By further including 0.01 to 5 parts by weight based on 100 parts by weight of the resin monomer or oligomer, or the thermosetting resin, the retroreflection and reflection effect of the incident light by refraction can be improved, thereby remarkably improving visibility.

The content of the organic beads may vary depending on factors such as the type and background color of the printing target medium, the color tone and saturation and brightness of the print layer, and the required visibility, but in general, if it is less than 0.01% by weight, retroreflection and The reflective effect may be insufficient, and conversely, if it exceeds 5% by weight, it may rather lead to a decrease in visibility for the printed layer.

In the case of the organic beads, having a diameter of less than 0.1 μm is difficult to manufacture, and when it exceeds 10 μm, transparency and visibility may be reduced.

It is particularly preferable in terms of improving visibility to use a mixture of various types of organic beads having different diameters.

Beads with an average particle diameter of 0.1 μm or more to less than 0.5 μm have a relatively long wavelength and insufficient diffusivity for incident light of infrared and red series with a relatively low frequency, but have a relatively short wavelength and a relatively high frequency of ultraviolet and violet light. spreads effectively.

In addition, beads having an average particle diameter of 0.5 μm or more to less than 1.0 μm appropriately diffuse visible light of a relatively short wavelength and relatively high frequency from a red series having a relatively long wavelength and a relatively low frequency.

On the other hand, beads having an average particle diameter of 1.0 μm or more to 10 μm or less effectively diffuse incident light of infrared and red series having a relatively long wavelength and relatively low frequency.

Therefore, beads having an average particle diameter of 0.1 μm or more to less than 0.5 μm: Beads having an average particle diameter of 0.5 μm or more to less than 1.0 μm: Beads having an average particle diameter of 1.0 μm or more to 10 μm or less are mixed in a weight ratio of 1:0.5-5:0.5-5. It can be used, and exceeding the above range may result in insufficient results to improve the visibility of the actual output.

In addition, the solvent used in the flame retardant composition is distilled water, methanol, ethanol, MEK (methyl ethyl ketone), toluene, acetone, DMF (dimethyl formamide), or any mixture thereof, UV-curable resin monomer or oligomer, or thermosetting It can be used in an amount of 15 to 40 parts by weight based on 100 parts by weight of the resin.

On the other hand, as the curing agent, an isocyanate-based curing agent, an epoxy-based curing agent, or a melamine-based curing agent known in the art is selected according to the type of resin or monomer or oligomer used, and 1 to 100 parts by weight of the UV-curable resin monomer, oligomer, or thermosetting resin It is used in an amount of 5 parts by weight.

In addition, as the leveling and antifoaming agent, in general, a silicone-based antifoaming agent or a non-silicone-based agent known in the art can be used, and typical examples are silicone-based antifoaming agents such as Tween 80 and Tween 100, and the amount used is a UV curable resin monomer or oligomer, or 100 parts by weight of a thermosetting resin. It is used in an amount of 0.1 to 3 parts by weight.

The flame retardant composition is coated to form a coating film thickness of 2 to 100 μm on the outer surface of the printed layer formed by actual printing, and then instantaneously cured by UV curing, or from 1 to 53 m/min at a temperature of 60 to 160 ° C. After thermal curing (drying) by IR irradiation or heater irradiation at a speed, specifically, a speed of 3 m/min, natural curing is performed.

Next, with reference to the drawings will be described with respect to the after-coating device after the flame-retardant layer of the printed matter according to the present invention.

1 is a cross-sectional view of an apparatus 1 after a flame retardant layer of a live-action printout according to a first embodiment for carrying out a method for coating a fire-resistant layer of a live-action print according to the present invention, after the flame-retardant layer of the actual counting output according to the present invention; The coating apparatus 1 includes a frame 10 installed on a die 11, and a feed roller 2 on which a photorealistic output having a printed layer is wound and located on one side of the frame. and a guiding roller 4 and a wiping roller 5 supported by a supporter 3, and a dispersion roller 6, located above the supporter 3, and supplying a flame retardant solution a spout (8), a flame retardant recovery tray (14) positioned below the supporter (3), and a drying oven (or IR irradiator) (12) positioned above the frame (10), and the It consists of a product roller (9) for winding the final product formed with a flame retardant layer located on the other side of the frame (10).

It will be referred to with respect to the operating relationship of the after-coating device (1) after the flame retardant layer of the actual output according to the present invention.

A guiding roller that is rotatably fixed to the supporter 3 in which the printed output having the printed layer is wound, and the printed layer is supplied from the supply roller 2 located on one side of the frame 10 . It moves continuously while passing through (4) and the wiping roller (5).

On the other hand, a dispersion roller 6 is positioned on the upper portion of the supporter 3, and the dispersion roller 6 includes first and second threaded portions 6a formed in the left and right halves, respectively, as shown in FIG. 2 , 6b), and the threads of the first and second threaded parts 6a and 6b are formed in opposite directions to each other, so that the flame retardant liquid discharged from the spout 8 above the supporter 3 is applied to the dispersion roller ( 6) is uniformly distributed in the width direction on both left and right sides and supplied to the printed layer of the actual print.

The flame retardant liquid is controlled to a predetermined application thickness by the wiping roller 5 installed at a predetermined distance from the frame of the supporter 3, while the surplus flameproof liquid is removed from the recovery tray 14 below the supporter 3 ), and the printed output with the flame retardant applied with a uniform thickness on the surface of the printed layer is transferred to the upper side of the frame 10 and cured by heating by a drying oven 12 .

In the continuous (continuous) flame retardant layer coating device (1), the transfer speed of the actual output is not limited, but is 1 to 5 m/min, specifically about 3 m/min, as described above, and the curing temperature is the actual output product Although it can be variously changed according to various parameters such as the type and thickness and density of the substrate, the thickness of the flame retardant layer, the resin type of the flame retardant layer, etc., in general, it is heated at a temperature of 60 to 160 ° C. for 0.1 to 5 minutes.

Then, the final product in which the flame retardant layer is formed on the surface of the printed layer of the actual print is wound on the product roller 9 via the guiding roller 4a, and at this time, if necessary, optionally a cooler mounted on the die 11 ( 13) can be cooled.

Unexplained reference numeral 7 in the drawing is a pull-rod for adjusting the spacing of the supporter 3 with respect to the frame 10 .

Figure 3 is a schematic cross-sectional view of an apparatus 1a after the flame retardant layer of the actual counting output according to the second embodiment for performing the method for coating the fire retardant layer of the actual counting output according to the present invention, the flame retardant layer of the actual counting output according to the present invention The post-coating device (1a) includes a guiding roller (4) for transporting a printed output having a printed layer, and a flame retardant tank (15) in which a plurality of 80-150 kHz ultrasonic transducers (16) are installed, and, the The application roller 18 for applying the flame retardant liquid 17 of the flame retardant tank 15 to the actual print, and the coating thickness of the flame retardant 15 by nip pressing adjacent to the application roller 18 UV irradiation curing unit 20 (in some cases, IR irradiation or heater heating tactics) for curing by irradiating ultraviolet rays to the transfer roller 19 for controlling the transfer roller 19 and the transferred flame retardant 15 coated output thermosetting part as described above).

Although not shown in FIG. 3, as in FIG. 1, it includes a supply roller for supplying the actual output, and a product roller on which the final product in which the flame retardant layer is cured in the ultraviolet curing unit 20 is wound.

Even in the continuous (continuous) flame-retardant layer coating device (1a), the transfer speed of the actual output is not limited, but is 1-5 m/min, specifically about 3 m/min.

The amount of UV accumulated light and irradiation time in the UV curing unit 20 may vary according to various parameters such as the composition and thickness of the flame retardant layer, the type of monomer or oligomer of the flame retardant layer, the type of catalyst, the type and amount of the curing agent, etc. However, in general terms, the amount of accumulated UV light is 50 to 1,000 mJ/cm2 and the irradiation time is about 0.1 to 10 seconds.

1,1a: post-coating device according to the present invention
2: Realistic print feed roller 3: Supporter
4,4a: guiding roller 5: wiping roller
6: dispersion roller 6a: first threaded portion
6b: second threaded portion 7: pull-rod
8: flame retardant supply spout 9: product roller
10: Frame 11: Die
12: drying oven or IR irradiator 13: cooler
14: flame retardant recovery tray 15: flame retardant tank
16: ultrasonic transducer (transducer) 17: flame retardant solution
18: application roller 19: transfer roller
20: UV irradiation hardening part (or thermosetting part of IR irradiation or heater heating)
As mentioned above, although the present invention has been described in detail, the present invention is not limited thereto, and various changes and modifications can be made thereto by those skilled in the art, and this is also within the scope of the present invention.

Claims (7)

A method of coating after the flame retardant layer of the actual output comprising the steps of:
(A) 10 to 40 parts by weight of a complex flame retardant comprising an inorganic phosphorus flame retardant of red phosphorus, ammonium phosphate or ammonium polyphosphate and an organic phosphorus flame retardant of an aromatic phosphate or haloalkyl phosphate based on 100 parts by weight of the UV-curable resin monomer or oligomer, and a solvent; 15 to 40 parts by weight, 1 to 5 parts by weight of a curing agent, 0.1 to 3 parts by weight of a leveling and defoaming agent, 0.01 to 1 parts by weight of a photocatalyst, and 0.01 to 5 parts by weight of organic beads, wherein the composite flame retardant is inorganic phosphorus-based Flame retardant: organic phosphorus-based flame retardant = 1: including in a weight ratio of 0.1 to 10, wherein the organic bead is from the group consisting of silicone resin, polyacrylate, polyurethane, polyethylene, polypropylene, nylon, polystyrene, and polymethyl methacrylate As at least one organic bead selected, a bead having an average particle diameter of 0.1 μm or more to less than 0.5 μm: Beads having an average particle diameter of 0.5 μm or more to less than 1.0 μm: Beads having an average particle diameter of 1.0 μm or more to 10 μm or less are 1:0.5-5 by weight : Preparing a flame retardant composition mixed in a ratio of 0.5 to 5;
(B) a print-out step of forming a print layer by digital printing on the print-receiving layer of a fabric fabric or polypropylene synthetic paper having a print-receiving layer formed on a substrate; and
(C) applying the flame retardant composition to the outer surface of the print layer, and curing by ultraviolet irradiation to form a flame retardant layer having a thickness of 2 to 100㎛. A method of coating after the flame retardant layer of the actual output comprising the steps of:
(A) Based on 100 parts by weight of the thermosetting resin, 10 to 40 parts by weight of a composite flame retardant comprising an inorganic phosphorus flame retardant of red phosphorus, ammonium phosphate or ammonium polyphosphate and an organophosphorus flame retardant of an aromatic phosphate or haloalkyl phosphate, and 15 to 40 parts by weight of a solvent and 1 to 5 parts by weight of a curing agent, 0.1 to 3 parts by weight of a leveling and defoaming agent, 0.01 to 1 parts by weight of a photocatalyst, and 0.01 to 5 parts by weight of an organic bead, wherein the composite flame retardant is an inorganic phosphorus flame retardant: an organic phosphorus flame retardant = 1: at least one selected from the group consisting of a weight ratio of 0.1 to 10, wherein the organic beads are silicone resin, polyacrylate, polyurethane, polyethylene, polypropylene, nylon, polystyrene, and polymethyl methacrylate As an organic bead of, beads having an average particle diameter of 0.1 μm or more to less than 0.5 μm: Beads having an average particle diameter of 0.5 μm or more to less than 1.0 μm: Beads having an average particle diameter of 1.0 μm or more to 10 μm or less are 1:0.5-5:0.5-5 by weight Preparing a flame retardant composition that is mixed in a ratio;
(B) a print-out step of forming a print layer by digital printing on the print-receiving layer of a fabric fabric or polypropylene synthetic paper having a print-receiving layer formed on a substrate; and
(C) applying the flame retardant composition to the outer surface of the print layer, and heat curing at a temperature of 60 to 160 ℃ to form a flame retardant layer having a thickness of 2 to 100㎛. The method of claim 1 or 2, wherein the application of the flame retardant composition is homogeneously applied under vibration by an ultrasonic transducer of 80 to 150 kHz. a frame installed on the die;
a supply roller on which the actual output having the printed layer is wound and located on one side of the frame;
a guiding roller, a wiping roller, and a dispersion roller supported by the supporter;
a spout positioned above the supporter and supplying a flame retardant;
a flame retardant recovery tray positioned below the supporter;
a drying oven positioned above the frame;
and a product roller positioned on the other side of the frame:
The flame-retardant liquid made of the flame-retardant composition according to claim 1 or 2, which is discharged from the spout while the printed layer is formed through the guiding roller and the wiping roller supported by the supporter, is dispersed by the dispersion roller. It falls and is supplied to the printed layer of the printed matter, and is controlled to a uniform coating thickness by the wiping roller, while the surplus flame-retardant liquid is recovered through a recovery tray, and the flame-retardant liquid is uniformly applied to the surface of the printed layer. The applied actual print is transferred to the upper part of the frame and cured by a drying oven.
A device for coating after the flame-retardant layer of the actual print. According to claim 4, wherein the dispersion roller has first and second threaded portions formed in left and right halves, respectively, and the first and second threads of the threaded portion are formed in opposite directions to each other. After-layer coating device. a guiding roller for transporting the printed material having a printed layer;
A flame retardant tank in which a plurality of ultrasonic transducers are installed and containing the flame retardant composition according to claim 1 or 2;
an application roller for applying the flame retardant liquid of the flame retardant tank to the actual print;
a conveying roller adjacent to the application roller for controlling the application thickness of the flame retardant liquid by nip pressing;
Having a UV irradiation curing unit or a thermosetting unit for curing by irradiating ultraviolet rays to the transferred printed matter coated with the flame retardant solution
A device for coating after the flame-retardant layer of the actual print. [Claim 7] The apparatus of claim 6, wherein the ultrasonic transducer oscillates an ultrasonic wave of 80 to 150 kHz.

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