JP2008087184A - Dryer in printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the drying efficiency of a drying apparatus in a printer which uses one having optical transmitting property as an article to be printed, and at the same time, uses an ultraviolet ray drying. <P>SOLUTION: The printer performs the printing on the article 4 to be printed having optical transmissivity by using an ultraviolet curing type ink, and dries the printed image by an ultraviolet dryer 5. In the dryer of the printer, a reflective member the surface of which is made white is installed on the counter section with the ultraviolet dryer, and the article to be printed is made to run between the ultraviolet dryer and the reflective member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention uses an ultraviolet dryer to dry a printed image on a light-transmitting printed material printed using an ultraviolet curable ink, such as offset printing, direct printing, and printing by an inkjet printer. The present invention relates to a drying device in a printing apparatus.

  In a drying apparatus using an ultraviolet dryer, the downstream side of the printing unit of the printing material travels on the printing surface of the long printing material printed by the printing unit using ultraviolet curable printing ink. The printed image is dried by irradiating with ultraviolet rays from an ultraviolet dryer in a path, for example, a state wound around the impression cylinder, or at a position off the impression cylinder.

JP 55-124658 A

  In the case of a drying apparatus using the above-described ultraviolet dryer, when the printed material is a general printing paper or a film having no light transmittance, the ultraviolet ray is favorably absorbed on the surface of the printed material. Ink drying with ultraviolet rays is performed satisfactorily. However, when the printed material has a light-transmitting property such as a transparent film, the irradiated ultraviolet rays are transmitted as they are. There was a problem that it was lower than that of a light-transmitting substrate. In order to make up for this problem, it has been unavoidable that the drying apparatus has a large capacity and a large size. For this reason, problems such as an increase in installation space and an increase in equipment costs have occurred.

  In the case of drying with ultraviolet rays while being wound around the impression cylinder of the rotary printing unit, the surface of the conventional impression cylinder is subjected to chrome plating, and the reflectance of ultraviolet rays on this chrome plating surface is 45. Since it is as low as ˜50%, most of the ultraviolet light transmitted through the transparent film is absorbed and reflected off the surface of the impression cylinder, and the ultraviolet light transmitted through the transparent film is wasted.

  The present invention has been made in view of the above, and in a drying apparatus using an ultraviolet dryer, it is possible to effectively utilize ultraviolet rays that have passed through the printing material, and even a printing material such as a highly light-transmitting film, It is an object of the present invention to provide a drying apparatus in a printing apparatus that can efficiently dry the printing surface with ultraviolet rays.

  In order to achieve the above-mentioned object, the invention described in claim 1 prints on a printed material having light permeability using an ultraviolet curable ink, and the printed image is dried by an ultraviolet dryer. In the drying device in the printing apparatus, a reflection member having a white surface is provided at a facing portion of the ultraviolet dryer, and the printed material is caused to travel between the ultraviolet dryer and the reflection member.

  According to the second aspect of the present invention, an ultraviolet curable ink is applied to a printed material having a light transmission property that is wound around a pressure drum of a rotary printing unit and is transferred to the pressure drum by a blanket or a plate cylinder. In a drying apparatus in a printing apparatus in which a printed image of this printing material is dried with an ultraviolet dryer, the peripheral surface of the impression cylinder is white, and the ultraviolet dryer is opposed to the circumferential surface of the impression cylinder It is a configuration that was allowed to.

  In the invention according to claim 3, printing is performed on a printed material having light permeability using an ultraviolet curable ink in a rotary printing unit, and the printed image is dried by an ultraviolet dryer. In the drying device of the printing apparatus, a reflecting plate with a white surface is installed on the downstream side of the rotary printing unit so that the surface of the reflecting plate faces the back side of the printing material, and the printing material is placed on the surface of the reflecting plate. An ultraviolet dryer is provided so as to face each other at a distance.

  According to a fourth aspect of the present invention, a printed material having light permeability is printed by an inkjet printer using ultraviolet curable ink, and the printed image is dried by an ultraviolet dryer. In the drying device in the printing apparatus, a reflection member having a white surface is provided at the opposite portion of the ultraviolet dryer, and the printed material is allowed to travel between the ultraviolet dryer and the reflection member.

  And in the apparatus of each said invention, the white surface was made into the fine irregular reflection property.

  According to the first aspect of the present invention, the ultraviolet rays transmitted through the printing material irradiated from the ultraviolet dryer are reflected with a very high reflectance on the white surface of the reflecting member located on the back side of the printing material. By irradiating from the back side of the printed material, it is possible to efficiently dry the printed image of the printed material printed with the ultraviolet curable ink with an ultraviolet dryer.

  As a result, it is possible to prevent an increase in the size of the apparatus due to an increase in installation space accompanying an increase in the capacity of the drying action, and it is possible to suppress an increase in equipment costs and power consumption of the ultraviolet dryer.

  In particular, in the invention described in claim 2, when the present invention is applied to a rotary printing press, the above-described effects can be obtained only by changing the surface treatment of the impression cylinder without particularly changing the apparatus configuration. it can.

  In the invention of claim 3, as in the invention of claim 3, in the rotary printing machine, a simple reflector is provided opposite to the ultraviolet dryer on the back side of the travel path of the substrate. The effects of the above-described invention can be achieved.

  Even when the present invention is applied to a printing apparatus using an ink jet printer, the same effects as those of the above inventions can be obtained, and an image printed by the ink jet printer can be efficiently dried.

  Further, in the invention according to claim 5, by making the white surfaces of the reflecting member, the impression cylinder and the reflecting plate irregularly reflective, the ultraviolet rays transmitted through the printing material and irradiated on these surfaces are: By uniformly irradiating the substrate with irregular reflection, a uniform drying effect can be obtained on the substrate.

  FIG. 1 shows a printing unit portion of an offset type printing apparatus. In the figure, 1 is an impression cylinder, 2 is a blanket cylinder, 3 is a plate cylinder, and a long printed material 4 is an impression cylinder 1 and a blanket cylinder 2. By passing through, the image transferred from the plate cylinder 3 to the blanket cylinder 2 is printed on the substrate 4. At this time, the printing unit section uses an ultraviolet curable ink, and the printed material 4 uses a light transmissive transparent film.

  In the first embodiment, the ultraviolet dryer 5 is opposed to the contact point of the impression cylinder 1 with the blanket cylinder 2, that is, the downstream side from the printing point, and the printing is performed by the ultraviolet rays irradiated from the ultraviolet dryer 5. The printed image printed at the dots is dried. As the ultraviolet dryer 5, a known one is used in which an ultraviolet lamp 7 is installed inside the reflecting mirror 6 directed in the irradiation direction.

  The peripheral surface of the impression cylinder 1 is made white by surface treatment.

Thus, the image of the substrate 4 printed by the printing unit is dried by the ultraviolet rays irradiated from the ultraviolet dryer 5.

  At this time, the ultraviolet rays from the ultraviolet dryer 5 are applied to the entire width direction of the substrate 4 and the printed image of the substrate 4 is primarily dried by the direct ultraviolet rays. The printed material 4 is a transparent film having light transmittance, so that the direct ultraviolet light passes through the printed material and is reflected by the white surface of the impression cylinder 1, and the reflected ultraviolet light is transmitted to the back surface of the printed material 4. Irradiation is performed, and the printed image of the printing material 4 is secondarily dried by the reflected ultraviolet rays.

  Since the peripheral surface of the impression cylinder 1 is white at this time, the transmitted ultraviolet rays irradiated on the surface are reflected by nearly 100%, and the reflected ultraviolet rays are efficient for secondary drying of the printed image of the substrate 4. It is often used and the drying efficiency by the ultraviolet dryer 5 is improved.

  In Example 2, in a printing unit similar to the printing unit in Example 1 described above, ultraviolet drying is performed at a position downstream of the impression cylinder 1 in the traveling direction of the substrate 4 and immediately downstream of the impression cylinder 1. The machine 5 is arranged so as to face the printing surface at a right angle. Further, a reflecting plate 8 is provided at a position facing the ultraviolet dryer 5 via the printing material 4 so that the surface of the printing material 4 is parallel to the surface. And the surface of this reflector 8 is made white by the surface treatment.

  Even in the second embodiment, as in the first embodiment, the printed image of the printing material 4 printed by the printing unit unit is dried by the ultraviolet rays irradiated from the ultraviolet dryer 5.

  At this time, the ultraviolet rays irradiated from the ultraviolet dryer 5 and firstly dried after passing through the image ink of the printing material 4 are reflected by the reflecting plate 8 and irradiated again on the back side of the printing material 4. The image ink is secondarily dried.

  In both the above embodiments, an example of the offset printing type is shown in the printing unit section. However, this may be a direct printing type in which convex printing is performed by rolling the plate cylinder 3 to the impression cylinder 1. Not too long.

  FIGS. 3 and 4 show Embodiments 3 and 4 of the present invention. A print head 10 of an ink jet printer using ultraviolet curable ink for a printing material 4 that is guided by a guide roller 9 and travels. An example of a drying apparatus in which an image printed by this apparatus is dried by an ultraviolet dryer 5 is shown.

  3 shows that the ultraviolet dryer 5 is opposed to the drawing of the guide roller 9, and the printed image of the printing material 4 is dried on the peripheral surface of the guide roller 9. This guide is shown in FIG. The peripheral surface of the roller 9 is made white by surface treatment like the impression cylinder 1 in the first embodiment.

  4, the ultraviolet dryer 5 is provided so as to face the traveling path of the substrate 4 and the printed image of the substrate 4 is dried on the traveling path. Is provided with a reflecting plate 8 whose surface is white so that the surface of the substrate 4 and the surface of the substrate 4 are parallel to each other.

  In the third and fourth embodiments, the third embodiment shown in FIG. 3 is the same as the first embodiment, and the fourth embodiment shown in FIG. 4 is the same as the second embodiment. 4 print images are dried.

  The white surface in each of the above-described embodiments has fine irregular reflection properties such as matte and satin.

  In each of the above-described embodiments, the surface treatment for making each white surface white is performed by means such as white ceramic spraying, titanium dioxide, alumina coating, and white synthetic rubber application. Of course, materials and means other than these may be used. Further, in the reflection plate 8, a white paint may be used because the surface does not rub against the substrate 4.

  The white color used for the reflection surface of the ultraviolet rays is ideally a white tancal having a whiteness of 85% or more as defined by JIS, but it may be white up to a whiteness of about 65%.

It is explanatory drawing which shows Example 1 of this invention. It is explanatory drawing which shows Example 2 of this invention. It is explanatory drawing which shows Example 3 of this invention. It is explanatory drawing which shows Example 4 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Impression cylinder, 2 ... Bracket cylinder, 3 ... Plate cylinder, 4 ... Printed material, 5 ... Ultraviolet dryer, 6 ... Reflector, 7 ... Ultraviolet lamp, 8 ... Reflector, 9 ... Guide roller, 10 ... Print head .

Claims (5)

In a drying apparatus in a printing apparatus that uses a UV curable ink to print on a light-transmitting substrate and that the printed image is dried with an ultraviolet dryer.
A drying apparatus in a printing apparatus, wherein a reflection member having a white surface is provided at a facing portion of an ultraviolet dryer, and the substrate is allowed to travel between the ultraviolet dryer and the reflection member. Printed on a printed material having light permeability, which is wound around the impression cylinder of a rotary printing unit, using ultraviolet curable ink on a blanket or a plate cylinder that is in contact with the impression cylinder. In the drying device in the printing device that is to be dried with an ultraviolet dryer,
A drying device in a printing apparatus, wherein the peripheral surface of the impression cylinder is white and an ultraviolet dryer is opposed to the peripheral surface of the impression cylinder. In a rotary printing unit, printing is performed on a printed material having a light transmission property using an ultraviolet curable ink, and this printing image is dried by a UV dryer.
A reflector having a white surface is installed downstream of the printing unit of the rotary printing press so that the surface of the reflector faces the back side of the substrate, and the substrate is opposed to the surface of the reflector with the substrate separated. A drying apparatus in a printing apparatus, wherein an ultraviolet dryer is provided. In a drying apparatus in a printing apparatus, which is printed on a traveling material having light permeability, printed by an inkjet printer using ultraviolet curable ink, and the printed image is dried by an ultraviolet dryer.
A drying apparatus in a printing apparatus, wherein a reflection member having a white surface is provided at a facing portion of an ultraviolet dryer, and the substrate is allowed to travel between the ultraviolet dryer and the reflection member.   5. The drying apparatus for a printing apparatus according to claim 1, wherein the white surface has a fine irregular reflection property.

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