JP2008120055A - Printed matter with photocatalyst and its continuous manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To continuously manufacture printed matters with a photocatalyst thinly and uniformly applied without impairing the presentable appearance of a printing surface of the short length printed matter. <P>SOLUTION: The printed matter 2 having the photocatalyst of ultrafine particle additionally applied to the surface of a printing layer of a short length printing paper, without impairing the presentable appearance of the printing surface substantially is obtained by performing in order the following processes: (1) a printing process A to print a short length base material 1 to be printed, (2) a movement process B to move the obtained printed matter 2 by a conveyor 5, (3) a photocatalyst applying process C to form a transparent layer by briefly jetting a dispersion medium 7 containing the photocatalyst 3 of ultrafine particle, while moving the printed matter 2, and (4) a catalyst activation process D to activate the photocatalyst by irradiating the transparent layer with energy from a light source 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, normal printing is continuously performed on a short substrate to be typified by paper, and a printed matter having a transparent layer of a photocatalyst on the obtained printed matter, followed by continuous printing. It relates to a manufacturing method.

Conventionally, a technique for forming a transparent paint containing a photocatalyst on a substrate to be printed is known from Japanese Patent Application Laid-Open No. 2001-089704. In this known technique, a transparent paint having an environment-friendly photocatalyst is applied to a long printed matter by a spraying device.

  However, after printing on the surface of a short printing paper using this technology, a photocatalyst that exerts effects such as air purification, deodorization, sterilization, etc. on the printed layer of the obtained printed matter, particularly titanium oxide. A transparent layer having no can not be formed. That is, the known technique requires use of an apparatus for applying a photocatalyst while a long substrate to be printed is continuously moving.

Further, as shown in FIG. 5, following the printing process A in which printing is continuously performed on the short substrate 1, the appearance of the printing surface P is displayed on the printed short printed matter 2. If it is going to adopt the photocatalyst coating process C which forms the transparent film Q which has the photocatalyst 3 continuously without impairing, the transfer speed of the printed matter 2 between the conveyor 4 in the printing process A and the conveyor 5 in the photocatalyst coating process C is increased. There is a problem that they must be the same. Next, even if the speeds are the same, if the known photocatalyst injection means 6 is used without any particular effort, this time, the photocatalyst injection means 6 does not follow the transfer speed. There is a problem that the photocatalyst cannot be applied to the printing surface P thinly and uniformly.
JP 2001-089704 A

  The present invention is intended to solve the above-mentioned problems. Therefore, the object of the present invention is to apply a predetermined print on a short substrate to be printed, particularly paper, and then to apply the print on the printed matter. The object is to continuously produce a printed matter in which a photocatalyst is thinly and uniformly applied without impairing the appearance of the printed surface.

  In order to solve the above-mentioned problems, the present invention provides a printing layer printed on the surface of a short printing paper, and an ultrafine photocatalyst that does not substantially impair the appearance of the printing layer on the printing layer. A printed matter having a photocatalyst obtained by sequentially laminating transparent layers containing s is formed.

  Similarly, in order to solve the above-described problems, the present invention provides a printing process (A) in which predetermined printing is continuously performed on a short substrate to be printed, and the obtained printed matter is placed on a conveyor. A conveying step (B) for conveying, and a dispersive medium containing ultrafine photocatalyst on the printed material conveyed on the conveyor is intermittently ejected from the ejecting means, so that the appearance of the printed surface is substantially formed on the printed material. A method comprising a photocatalyst coating step (C) of laminating and forming a transparent coating layer that does not impair the top is adopted.

In the present invention, the “substrate to be printed” means a planar substrate that is not printed and is about to be printed. The “printed product” means a printed planar substrate or a planar substrate on which a transparent paint containing a photocatalyst is applied, to which a transparent paint containing a photocatalyst is to be applied. Furthermore, in the present invention, the dispersion medium means a mixture of water or an organic solvent in which the photocatalyst is dispersed and a medium that exhibits a function of fixing the photocatalyst on the printed planar substrate.

  In the present invention, by adopting the above-mentioned means, the ejection means intermittently ejects the dispersion medium according to the length of the short substrate to be printed moving on the conveyor. Therefore, in the process of transporting a short printed product by the conveyor, it is possible to stop and start the operation of the ejection unit in accordance with the time space formed between the printed products.

Furthermore, in order to achieve the above-described problem more efficiently, the present invention places a printing process (A) for continuously printing on a short substrate to be printed and the obtained printed matter on a conveyor. The conveying step (B) for conveying the ink and the dispersion medium containing the ultrafine photocatalyst onto the printed material conveyed on the conveyor are continuously ejected from the ejecting means, and the appearance of the printing surface is substantially formed on the printed material. A photocatalyst coating step (C) for laminating and forming a transparent paint layer that does not impair the top, and a photocatalyst dispersed in the transparent paint layer of the printed matter by irradiating light from a light source installed near the conveyor The continuous production method of the printed matter which consists of the catalyst activation process (D) to activate is employ | adopted.

In the present invention, the catalyst activation step (D) is further added to the printing step (A), the conveyance step (B), and the photocatalyst coating step (C), so that the energy of the light source installed near the conveyor The photocatalyst is activated and drying of the transparent paint is promoted. In addition, since paper is selected as the substrate to be printed, in the printing method according to the present invention, the paper is easier to transport and handle than other daily printing substrates.

Further, in the present invention, when the printed matter that is continuously printed enters under the influence of the ejecting means in the photocatalyst coating step (C), the ejecting means is operated to eject the dispersion medium onto the printed matter. To do. Conversely, when the printed matter is no longer under the influence of the ejecting means, the operation of the ejecting means is stopped. By doing so, the ejection unit can suppress the amount of the dispersion medium containing the photocatalyst for the printed matter to the minimum necessary, and the amount of ejection of the dispersion medium to the region other than the printed matter can be reduced. Never do.

As described above, in the present invention, the application of the dispersion medium containing the ultrafine photocatalyst to the printed matter and the stop thereof are synchronized with the moving speed of the conveyor, and the photocatalyst ejected from the ejecting means from the ejecting means to the printed matter is contained. In order to further shorten the arrival time of the dispersion medium, preferably, a so-called ink jet, that is, a means in which the dispersion medium is ejected at high speed from the jet nozzle as fine droplets by bubbles is adopted as the ejection means.

  In the present invention, titanium oxide is preferably used as the photocatalyst. And in order to be able to be ejected to an ink jet as ejecting means and not to substantially impair the aesthetics of printing itself, ultrafine particles having an average particle diameter of 1 to 100 nm, preferably 3 to 70 nm. Titanium oxide is used. When the average particle diameter of titanium oxide is less than 1 nm, the photocatalytic effect is not sufficiently exhibited although it depends on the distribution amount. When the average particle diameter is larger than 100 nm, the appearance on the printed surface is impaired. Then, in order to improve the environment in which the titanium oxide sprayed on the printed material exhibits a catalytic effect and the printed material is placed, the titanium oxide is dispersed and adhered to the printed material at a predetermined distance. Therefore, in the present invention, a dispersion medium having a titanium oxide concentration of 0.5 to 10% by weight, preferably 1 to 5% by weight, is used, and the medium is substantially overcoated on the substrate to be printed. Apply the dispersion medium to the extent that does not occur.

  The present invention provides a short printed material in which a photocatalyst is thinly and uniformly applied to an environment without damaging the aesthetics of the printed surface after printing a short substrate to be printed. Can be manufactured efficiently in accordance with the processing speed of the printing process.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings. As shown in FIG. 1, the method of the present invention is a printing process A in which predetermined printing is continuously performed on a short substrate 1 typified by paper, and the obtained printed matter 2 is placed on a conveyor 5. The dispersion medium 7 containing the ultrafine photocatalyst 3 is intermittently ejected from the ejecting means 6 onto the printed matter 2 on the printed matter 2 by moving the moving step B to be placed and moved, and onto the printed matter 2 moving on the conveyor 5. Photocatalyst coating process C for laminating and forming a transparent coating film that does not substantially impair the aesthetics of the surface, and the energy of the light source 20 installed on the conveyor 5 is irradiated to the coating film of the printed matter 3 and dispersed therein And a catalyst activation step D for activating the photocatalyst 3 being activated.

  The printing process A comprises a conventionally known apparatus. For example, the plate cylinder 8, the ink roller 9 for supplying ink to the plate cylinder 8, and the plate cylinder 8 to which ink is applied are transferred, and the blanket cylinder 10 is printed on the blanket cylinder 10. It is comprised from the impression cylinder 11 etc. which the base material 1 contacts.

  The conveyor 5 in the moving process B includes a first transporter 5a and a second transporter 5b, and the first transporter 5a includes a pair of rotating bodies 13 and 14 installed in parallel at a predetermined interval. It consists of a chain stretched over the peripheral surfaces and a gripping claw 15 installed intermittently on the chain, and conveys the printed matter 2 from the printing step A to the second conveyor 5b.

  The second conveyor 5b includes a pair of rotating bodies 16 and 17 installed in parallel at a predetermined interval, and an endless belt stretched on the peripheral surface thereof, and is gripped by the first conveyor 5a. The printed material 2 held by the nail 15 is placed on an endless belt and conveyed to the photocatalyst coating step C.

  The photocatalyst coating step C includes a storage tank 18 for the dispersion medium 7 containing the photocatalyst 3, and an ink jet 6 for injecting the dispersion medium 7 in the tank 18, that is, a dispersion medium containing titanium oxide as a photocatalyst by jetting bubbles. And injection means for injecting. As a dispersion medium used in the present invention, water and a binder or an organic solvent, that is, an alcohol, a hydrocarbon, an aldehyde, a ketone and the like are used. The titanium oxide mixed in the dispersion medium has the above-described mixing range.

  In the present invention, the inkjet 6 ejects the dispersion medium 7 in synchronization with the endless belt 5 so as to operate when the printed matter 2 moves to a predetermined position on the endless belt 5. Specifically, as shown in FIG. 2, when the front end 2a of the printed material 2 that is intermittently fed on the endless belt 5 comes under the influence of the ink jet 6, as shown in FIG. The inkjet 6 is started by turning it on. Next, when the printed material 2 moves and the rear end 2b is removed from the influence of the ink jet 6, the ink jet 6 is stopped by turning off the sensor in the same manner as described above. By doing so, wasteful blowing of the dispersion medium 7 is eliminated to save resources and to suppress deterioration of the printing environment.

  In the present invention, as a catalyst activation step D, as shown in FIG. 1, a light source 20 is installed on the conveyor 5, the energy is irradiated onto the coating film of the printed matter 2, and dispersed therein. The activated photocatalyst 3 is activated and drying of the coating film is promoted. In this step, the coating film is dried at about 70 to 100 ° C. In this way, the desired photocatalyst-added printed matter 19 according to the present invention is obtained.

  By carrying out the present invention in this way, after printing on a short substrate to be printed, it is continuously environmentally friendly and photocatalyst without damaging the aesthetics of the printed surface on the printed matter. Can be applied thinly and uniformly. As a result, after printing is continuously performed on the substrate to be printed, the photocatalyst can be subsequently adhered semi-continuously.

  The present invention follows the fundamental technical idea, and can be carried out by changing a part of the above-described embodiment as long as the effects of the invention are not significantly impaired. For example, a fragrance | flavor can be mixed in a dispersion medium, and the obtained printed matter can emit fragrance. Moreover, as shown in FIG. 4, the said photocatalyst application | coating process C can be provided in the 1st conveying machine 5a, and this invention can be implemented. This embodiment is employed when it is not necessary to immediately activate the catalyst.

  INDUSTRIAL APPLICATION After printing on a short to-be-printed base material, this invention can apply widely to the field | area which adheres a photocatalyst and manufactures the printed material useful for environmental improvement.

These are process drawings which constitute the method of the present invention. These are explanatory drawings of the main steps of the present invention. These are the diagrams which show the ON-OFF operation | movement of the sensor which operate | moves corresponding to the said main process. These are process drawings which show another aspect of the present invention. These are process drawings of the prior art.

Explanation of symbols

1: printed substrate (paper), 2: printed material, 2a: leading edge, 2b: trailing edge, 3: photocatalyst, 4, 5: conveyor, 5a: first conveying machine, 5b: second conveying machine, 6: inkjet 7: dispersion medium, 8: plate cylinder, 9: ink roller, 10: blanket cylinder, 11: impression cylinder, 12: claw, 13: rotating body, 14: rotating body, 15: gripping claw, 16: rotating body, 17: Rotating body, 18: Photocatalyst tank, 19: Photocatalyst-added printed material, 20: Light source, A: Printing process, B: Moving process, C: Catalyst application process, D: Catalyst activation process.

Claims (9)

A printed printing layer and a transparent layer containing an ultrafine photocatalyst that does not substantially impair the aesthetics of the printing layer are sequentially laminated on the surface of a short printing paper. Printed material having a photocatalyst characterized. A printing process (A) for continuously printing on a short substrate to be printed, a moving process (B) for moving the obtained printed material on a conveyor, and a printed material moving on the conveyor A photocatalyst coating step (C) in which a dispersion medium containing ultrafine photocatalyst is intermittently jetted from jetting means to laminate and form a transparent layer on the printed matter that does not substantially impair the appearance of the printed surface. The continuous manufacturing method of the printed matter which has the photocatalyst which becomes. A printing process (A) for continuously printing on a short substrate to be printed, a moving process (B) for moving the obtained printed material on a conveyor, and a printed material moving on the conveyor A photocatalyst coating step (C) in which a dispersion medium containing ultrafine photocatalyst is intermittently jetted from jetting means, and a transparent layer that does not substantially impair the appearance of the printed surface is laminated and formed on the printed matter; Continuous production of a printed matter having a photocatalyst comprising a catalyst activation step (D) for irradiating light of a light source installed on the conveyor to the transparent layer of the printed matter and activating the photocatalyst dispersed therein Method. The method for continuously producing a printed matter having a photocatalyst according to claim 2 or 3, wherein the substrate to be printed is paper. The method for continuously producing a printed matter having a photocatalyst according to claim 1 or 2, wherein the jetting means in the photocatalyst coating step (C) jets a dispersion medium when the printed matter in the moving step (B) passes below. The continuous production method of a printed matter having a photocatalyst according to claim 1 or 2, wherein the jetting means is an ink jet in which a dispersion medium containing an ultrafine photocatalyst is jetted by jetting bubbles. The said inkjet is a continuous manufacturing method of the printed matter which has a photocatalyst of Claim 6 which operate | moves synchronizing with a conveyor, when a printed matter moves to the predetermined position of a conveyor. The method for continuously producing a printed matter having a photocatalyst according to claim 1 or 2, wherein the photocatalyst is titanium oxide. The method for continuously producing a printed matter having a photocatalyst according to claim 8, wherein the titanium oxide has an average particle diameter of 3 to 70 nm.

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