JP4081769B2 - Drying device for dry-down confirmation of printed matter - Google Patents

Description

  The present invention relates to a drying apparatus for confirming dry-down of a printed material, in which a sheet-like printed material just printed is dried one by one in a short time, and a color change caused by drying of the printed material can be quickly confirmed. Is.

Conventionally, the ink on the surface of a printed sheet printed by offset printing takes 6 to 24 hours to dry. When drying immediately and seeing the color change after drying, a small area of the printed material was dried using a hair dryer or the like. In addition, a large printing machine has a drying device attached to the inside of the machine, but is not a drying device for confirming the dry-down of a printed matter that has just been printed. In addition, although the kind of ink was different, there was a drying device that applied hot air from above to dry the aqueous coating liquid. Further, in UV printing using UV ink, a dedicated drying device for irradiating a flat table with ultraviolet rays has been used.
JP-A-10-109405

However, the above technique has the following drawbacks.
(A) There was no device that uniformly dried a large area of printed matter such as the entire chrysanthemum size in units of one sheet within a short time.
(B) In order to confirm the influence of dry-down, it was necessary for the operator to operate it completely to dry it partially using a hair dryer or the like.
(C) When a flat drying device for an aqueous coating liquid was used for a printed matter for offset printing, drying was poor and it was insufficient for confirming dry-down.
(D) In printing work, it takes time and effort to adjust the color, and even if the color is adjusted according to the color sample in the wet state, the color tone is shifted due to the effect of dry-down after drying, and the object of the complaint There was a case.

In order to solve the above problems, the present invention
(A) A cylindrical drying chamber serving as a main body is provided, and the printed matter is temporarily fixed along the cylindrical curved surface of the inner wall ;
(B) providing an impeller-type rotary fan having a plurality of horizontally long plates attached to the inside of the cylindrical drying chamber ;
(C) the rotating fans, the drying chamber the central axis of rotation and the center line of the cylinder of the match and as the distance to the periphery and the drying chamber walls of rotation becomes less than half the diameter of the rotating outer periphery ,
(D) A heat source such as a heater is provided inside or outside the drying chamber, and a control device capable of controlling the temperature inside the drying chamber to be constant is provided so that the hot air flows along the cylindrical curved surface of the drying chamber wall through the rotating fan. Then, the entire surface of the temporarily fixed printed material is uniformly applied, and the ink on the surface of the printed material is dried with heat and wind. By using this drying apparatus, it is possible to obtain the print color tone after the printed material is dried down. Further, in consideration of safety and thermal efficiency, the heat generation source inside the drying chamber is characterized in that the heating element is attached to the blade of the rotary fan, or the blade of the rotation fan itself is the heating element.

  According to the present invention, a sheet-like printed matter that has just been printed by offset printing is dried one by one in a short time, and a decrease in ink density (dry down) caused by drying of the printed matter can be quickly confirmed. . In printing work, color adjustment requires time and labor, but this can be reduced. In addition, it is possible to reduce complaints about color shift due to the effect of dry-down. Furthermore, in addition to confirmation of dry-down, there is also an application as a drying device for short-time processing when a printed material is used in a hurry. In particular, when dealing with proof prints in the printing industry, there is an advantage as a measure for quick delivery.

  It is an object of the present invention to realize uniform drying of a sheet-like large-sized printed matter that has just been printed within a short period of time, thereby enabling quick confirmation of dry-down.

FIG. 1 is a perspective view showing an outline of an apparatus of the present invention 1, and Example 1 is as follows.
(A) A stainless steel cylindrical drying chamber (1) serving as a main body having a diameter of 40 cm and a length of 90 cm is provided, and the printed matter (2) of all chrysanthemums is temporarily fixed along the inner wall. As a temporary fastening method, a vacuum suction method or a method using a guide plate is used. In the method using the guide plate, the printed material is placed on the plate, the periphery of the printed material is pressed, and the guide plate is slid along the inner wall of the cylindrical drying chamber (1).
(B) An impeller-type aluminum rotating fan (3) having a diameter of 30 cm and a length of 85 cm is provided in the center of the inside of the drying chamber (1), and is temporarily fixed to the inner wall of the drying chamber (1) by rotating the fan. The printed product (2) is allowed to be evenly blown. A plurality of blades were used, and eight blades were used this time.
(C) A blower (4) and an air heater (5) are provided outside the drying chamber (1), and hot air is blown toward the center of the rotary fan (3).
(D) A partition plate and a return plate are provided so that hot air is collected in the center, and a flow is made such that hot air blows out in the circumferential direction by the rotation of the rotating fan (3).
(E) The rotating fan (3) is rotated at 500 rpm, and the hot air hits the printed matter (2) temporarily fixed to the inner wall of the drying chamber (1), and the ink on the surface of the printed matter is dried with heat and air.
(F) The wind striking the printed matter (2) escapes from the exhaust ports of the side plates provided on both sides of the drying chamber (1). The exhaust port should be throttled so that the displacement can be adjusted.

  The drying apparatus as described above. The air heater was adjusted in the range of 40 ° C to 100 ° C with a thermostat. In the experiment, good results were obtained at 60 ° C to 70 ° C. Drying was performed at 65 ° C. ± 5 ° C. for 5 minutes, and the art system and the coating system were 90% dried. 70% dried in mat system. The mat system was added for an additional 5 minutes to give 100% dryness. Here, “%” indicating the degree of drying represents a change in the solid density of the printing ink, and “100%” means that the density value has not changed even after a lapse of time. In addition, the color tone at a drying degree of 70% is sufficient for confirmation of dry-down.

FIG. 2 is a perspective view showing the outline of the apparatus of the present invention 2, and the second embodiment is as follows.
(A), (b), (d) described in “Example 1”, in which a resistance heating element (6) is attached to the blade surface of the rotating fan (3) as a heat source inside the drying chamber (1). ) To (f), a 1 kW resistance heating element was used for each plate surface of the eight blades. As a result of the experiment, sufficient hot air was obtained even when the rotational speed was reduced to 300 rpm, and drying ability was obtained. As a result of the experiment, a result of 70% for the mat system was obtained in 5 minutes, almost as in “Example 1”. Safety and thermal efficiency were improved by attaching a resistance heating element (6) to the rotating fan (3) as a heat source inside the drying chamber (1).

  In the printing operation of offset printing, the dry-down of the printed material can be confirmed within a short time, and the color adjustment for the printing of the printed material is completed quickly. This shortens the preparation time until OK paper printing and leads to cost reduction. Furthermore, in addition to the purpose of confirming dry-down, using this drying device at work sites where proof printing is the main business will be a measure for quick delivery.

  It is the perspective view which showed the outline | summary of this invention 1. FIG.   It is the perspective view which showed the outline | summary of this invention 2. FIG.

Explanation of symbols

1. Drying room
2. Printed matter
3. Rotating fan
4). Blower
5. Air heater
6). Resistance heating element

Claims (2)

In the drying device for drying the sheet-like printed matter and confirming the dry-down ,
(A) A cylindrical drying chamber serving as a main body is provided, and the printed matter is temporarily fixed along the cylindrical curved surface of the inner wall ;
(B) providing an impeller-type rotary fan having a plurality of horizontally long plates attached to the inside of the cylindrical drying chamber ;
(C) the rotating fans, the drying chamber the central axis of rotation and the center line of the cylinder of the match and as the distance to the periphery and the drying chamber walls of rotation becomes less than half the diameter of the rotating outer periphery ,
(D) A heat source such as a heater is provided inside or outside the drying chamber, and a control device capable of controlling the temperature inside the drying chamber to be constant is provided so that the hot air flows along the cylindrical curved surface of the drying chamber wall through the rotating fan. A drying apparatus for confirming dry-down of a sheet-like printed product, wherein the entire surface of the temporarily printed product is uniformly applied and the ink on the surface of the printed product is dried with heat and wind. 2. The sheet-like printed material according to claim 1 , wherein the heating source is a heating element attached to a blade of the rotary fan , or the blade of the rotary fan itself is a heating element. Down confirmation drying equipment.

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