JPH09174815A - Offset rotary press and ink fixing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the ink fixing of an initial cooling cylinder by increasing the diameter of the cylinder in the first contact with a dried matter to be printed of a plurality of cooling cylinders provided at a cooler larger than the other cooling cylinder. SOLUTION: In the offset rotary press, the diameter of a cooling cylinder in initial contact with dried matter to be printed of a plurality of cooling cylinders provided at a cooler is set larger than the other cooling cylinder. As a result, the temperature becomes about 70 deg.C while the matter to be printed is brought into contact with the initial cooling cylinder, the ink is fixed, thereby making it possible to prevent reticulation. Specifically, the diameter of the first cooling cylinder 7 in contact with the matter 8 to be printed is set about 2.5 times as large as those of second to fourth cooling cylinders 7. The diameter of the first cylinder is suitably 600 to 1,000mm in view of the space and cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset rotary printing press, and more particularly to a method and apparatus for cooling and fixing paper and ink when printing with heat set ink.

[0002]

2. Description of the Related Art In a conventional rotary offset press, as shown in FIG. 5, a winding unit 1 is mounted on a paper feeding unit 2, and a material 8 to be supplied is supplied to a printing unit 3, a drying unit 4, a cooling unit 5, and the like. Proceed with Oribe 6.
Although not shown in the drawing, it is folded at the folding portion 6, cut, accumulated, and bound. In the offset rotary printing press, the ink having the solvent component evaporated in the drying unit 4 is cooled in the cooling unit 5 and fixed to the paper. The solvent content of the ink evaporates at about 200 to 250 ° C, but at this time, the surface of the paper is 110 to 140 ° C.
Since it is about C, water in the paper is also evaporated.
The ink adheres to the paper at about 70 ° C.

One of the problems of quality deterioration in the drying unit 4 in offset rotary printing is the occurrence of fire wrinkles (which means corrugation in the grain direction of the paper). This is mainly due to the evaporation of the solvent component in the ink in the image area (printed area),
Although the evaporation of water in the paper is small, the evaporation of water in the paper is large in the non-image area (non-printed portion). for that reason,
The paper shrinkage is different, and this difference causes fire wrinkles. Also, if the ink is not firmly fixed, the ink may adhere to the rollers or contact with the former or turn bar.
Kosure may occur.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention contacts the first cooling cylinder with which the object to be printed (usually paper) comes into contact with the first cooling cylinder at the beginning of the cooling unit. It is an object of the present invention to provide a method capable of fixing ink while printing and an offset rotary printing machine using the method.

[0005]

In order to solve the above-mentioned problems, the invention of claim 1 is an offset rotary printing machine comprising a winding and feeding section, a printing unit section, a drying section, a cooling section, a folding machine section and the like. The cooling unit has a plurality of cooling cylinders, and a diameter of a first cooling cylinder, of the plurality of cooling cylinders, which is first contacted with a dried printing object is larger than that of other cooling cylinders. It is an offset rotary printing machine characterized by. With such a structure, the temperature becomes about 70 ° C. while the material to be printed is in contact with the first cooling cylinder, the ink is fixed, and it is possible to prevent fire wrinkles.

According to a second aspect of the present invention, in an offset rotary printing machine including a winding and feeding section, a printing unit section, a drying section, a cooling section, a folding section, etc., the cooling section has a plurality of cooling cylinders. The positional relationship of the plurality of cooling cylinders is provided such that the center positions of the individual cooling cylinders are moved toward each other so that the contact area with the printed material to be printed is large, and the dried printing material is The offset rotary printing press is characterized in that the first printing cylinder, which comes into contact at the very beginning, has a configuration in which a half or more of the circumferential length of the first cooling cylinder comes into contact with the printing object. With such a configuration, the temperature becomes about 70 ° C. while the material to be printed is in contact with the first cooling cylinder, the ink is fixed, and it is possible to prevent fire wrinkles.

According to a third aspect of the present invention, in an offset rotary printing press including a winding and feeding section, a printing unit section, a drying section, a cooling section, a folding section, etc., the cooling section has a plurality of cooling cylinders. Of the plurality of cooling cylinders, the diameter of the first cooling cylinder with which the dried printing material comes into contact first is made larger than that of the other cooling cylinders, and the positional relationship of the plurality of cooling cylinders is printed. In order to increase the contact area with the printed material to be printed, the central position of each cooling cylinder is provided in such a manner as to move closer to it, and the printed material comes into contact with at least half the circumferential length of the first cooling cylinder. This is an offset rotary printing press having a configuration. With such a configuration, that is, by combining claim 1 and claim 2, the temperature becomes about 70 ° C. and the ink adheres to the first cooling cylinder while the object to be printed is in contact with the first cooling cylinder. Makes it possible to more effectively achieve the action and effect of preventing wadding.

According to a fourth aspect of the present invention, in the second aspect, the plurality of cooling cylinders in the cooling section have a diameter of 6 mm.
The offset rotary printing press is characterized in that it has a size of 0 to 1000 mm. Cooling cylinder diameter 600
By limiting the thickness to 1000 mm, the above-mentioned actions and effects can be exhibited in a practical range.

According to a fifth aspect of the present invention, in the first or third aspect, the diameter of the first cooling cylinder is 60.
The offset rotary printing press is characterized in that it is set to 0 to 1000 mm. This also has a cooling cylinder diameter of 6
By limiting the thickness to 00 mm to 1000 mm, the above-described actions and effects can be exhibited within a practical range.

According to a sixth aspect of the present invention, there is provided an ink fixing method for an offset rotary printing press including a winding and feeding section, a printing unit section, a drying section, a cooling section, a folding section, and the like. It is a method of fixing ink in an offset rotary printing press that prevents the occurrence of fire wrinkles by prolonging the time of contact with a plurality of cooling cylinders in a cooling unit. This captures the category of the above items in the category of method called ink fixing method.

According to a seventh aspect of the present invention, in order to prolong the time of contact with the plurality of cooling cylinders, at least one printing material entering the cooling section from the drying section has a diameter of 600 to 1000 mm. 7. The ink fixing method for an offset rotary printing press according to claim 6, wherein the ink is brought into contact with the cooling cylinder. This is one in which a diameter of 300 to 400 mm, which is usually used, is replaced with a diameter of more than double. It is effective to set the diameter of the first cooling cylinder to 600 to 1000 mm.

According to an eighth aspect of the present invention, in the sixth or seventh aspect, in order to prolong the time in which the plurality of cooling cylinders are in contact with each other, the printing material entering the cooling section from the drying section is , Zigzag passing between the individual cooling cylinders provided by moving in the direction of approaching the center position, and at least half the circumference of the first cooling cylinder with which the dried printing material comes into contact first An ink fixing method for an offset rotary printing press, characterized in that the printed matter is brought into contact. By doing so, the temperature becomes about 70 ° C. while the material to be printed is in contact with the first cooling cylinder, the ink is fixed, and the action and effect of preventing fire wrinkles can be achieved more efficiently. To do.

[0013]

Embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 are explanatory views in which a portion of the cooling unit 5 in FIG. 5 is partially taken out. Inside the cooling unit 5, there is a cooling cylinder 7, and cooling water or the like flows through the cooling cylinder 7. By controlling the temperature and flow rate of this cooling water, it is possible to maintain appropriate cooling conditions. FIG.
Is the diameter of the first cooling cylinder with which the printed material 8 first comes into contact with the diameter of the second to fourth cooling cylinders, which is about 2.
It is explanatory drawing which made 5 times. In the figure, the cooling cylinder 7
The number of is described as four, but is not particularly limited. The diameter of the first cooling cylinder is 600 mm
If there is no physical problem above, it is preferable that the size is large, but in reality, 600 to 1000 mm is preferable in terms of space and cost.

In FIG. 2, the cooling cylinder 7 has a diameter of 30.
0 to 400 mm, but the arrangement is such that the center position of the cooling cylinder is brought closer, the printed material 8 passes in a zigzag manner, and the contact area between the first cooling cylinder and the printed material 8 is 1/2 or more of the circumference. There is something. The diameter of the first cooling cylinder is normal, but if the contact area is increased, the temperature of the cooling water is controlled to be low, and the amount of cooling water is increased, while the printing medium is in contact with the first cooling cylinder, Ink can be fixed. Further, in FIG. 2, the center position of the cooling cylinder is made to approach in the vertical direction, but the center position of the cooling cylinder may be made to approach in the horizontal direction at the same time.

FIG. 3 is a combination of FIG. 1 and FIG.
The diameter of the cooling cylinder is 750 mm and the second to fourth
In this example, the diameter of the cooling cylinder is 300 mm. Further, the center of the cooling cylinder 7 is further brought closer, and the contact area between the first cooling cylinder and the printed material is set to ½ or more of the surface. This increases the cooling effect on the first cooling cylinder, and
Overall cooling efficiency is also improved.

FIG. 4 shows the configuration of FIG.
The diameter of the cooling cylinder is also enlarged. The cooling capacity can be maximized in the illustrated embodiments.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. <Example 1> An offset rotary press as shown in FIG.
The cooling cylinder 7 having the structure as shown in FIG. 1 is arranged in the cooling section 5 (color + four colors) and the flow rate of the cooling water is adjusted so that the surface temperature of the cooling cylinder 7 becomes 10 to 15 ° C. The occurrence of fire wrinkles was reduced compared to the conventional type with a cooling unit.

<Embodiment 2> A cooling cylinder 7 is arranged in the cooling unit 5 of an offset rotary press (front 4 colors + back 4 colors) as shown in FIG. The flow rate of cooling water was adjusted so that the surface temperature was 10 to 15 ° C. The cooling effect was improved, and the fire wrinkles were better than in Example 1.

[0019]

When the offset rotary press according to any one of claims 1 to 3 is used, the contact time with the cooling cylinder becomes long, and the ink adheres particularly during the contact with the first cooling cylinder. Fire wrinkles are reduced. Also,
The inventions of claims 4 and 5 limit the diameter of the cooling cylinder to be increased to 600 to 1000 mm. As a result, the above effect can be obtained within a realistic range such as space. Claims 6 to 8 are methods for preventing the occurrence of fire wrinkles by prolonging the time of contact with the cooling cylinder, and when they are implemented, the configurations of claims 1 to 5 are obtained. When used, fire wrinkles can be prevented and a high quality offset printed matter can be provided, which is very effective. Further, there is also an effect that it is possible to prevent the ink from being fixedly adhered to the roller and the like due to the increased cooling efficiency.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a cooling cylinder of a cooling unit showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a cooling cylinder of a cooling unit showing an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a cooling cylinder of a cooling unit showing an embodiment of the present invention.

FIG. 4 is an explanatory diagram of a cooling cylinder of a cooling unit showing an embodiment of the present invention.

FIG. 5 is a schematic explanatory diagram of a conventional offset rotary printing press.

[Explanation of symbols]

1 ... Winding up 2 ... Paper feeding unit 3 ... Printing unit 4 ... Drying unit 5 ...
Cooling part 6 ... Folding part 7 ... Cooling cylinder 8 ... Printed material

Claims (8)

[Claims] 1. A winding paper feeding section, a printing unit section, a drying section,
In an offset rotary printing press including a cooling unit and a folding unit, the cooling unit has a plurality of cooling cylinders,
Among the plurality of cooling cylinders, a diameter of a first cooling cylinder with which a dried printing material comes into contact first is made larger than that of other cooling cylinders, and an offset rotary printing press is characterized. 2. A take-up and feeding section, a printing unit section, a drying section,
In an offset rotary printing press including a cooling unit and a folding unit, the cooling unit has a plurality of cooling cylinders,
The positional relationship of the plurality of cooling cylinders is provided such that the center positions of the individual cooling cylinders are moved toward each other so that the contact area with the printed material to be printed is large, and the dried printing material is An offset rotary printing press characterized in that at least half of the circumferential length of the first cooling cylinder that comes into contact with the very beginning is brought into contact with the printing material. 3. A winding and feeding section, a printing unit section, a drying section,
In an offset rotary printing press including a cooling unit and a folding unit, the cooling unit has a plurality of cooling cylinders,
Of the plurality of cooling cylinders, the diameter of the first cooling cylinder with which the dried printing material comes into contact first is made larger than that of the other cooling cylinders, and the positional relationship of the plurality of cooling cylinders is printed. In order to increase the contact area with the printed material to be printed, the central position of each cooling cylinder is provided in such a manner as to move closer to it, and the printed material comes into contact with at least half the circumferential length of the first cooling cylinder. An offset rotary printing press characterized by having a configuration. 4. The rotary offset printing press according to claim 2, wherein the plurality of cooling cylinders in the cooling section have a diameter of 600 to 1000 mm. 5. The diameter of the first cooling cylinder is 6
The offset rotary printing press according to claim 1 or 3, wherein the offset rotary printing press has a length of 0 to 1000 mm. 6. A winding and feeding section, a printing unit section, a drying section,
In the ink fixing method for an offset rotary printing press including a cooling unit and a folding unit, the time during which the printed and dried printing material is in contact with a plurality of cooling cylinders in the cooling unit is lengthened to cause fire wrinkles. Method to prevent ink from sticking to offset rotary printing press. 7. In order to prolong the time in which the plurality of cooling cylinders are in contact with each other, at least one substrate having a diameter of 600 to 600 is introduced into the cooling section from the drying section.
7. The ink fixing method for an offset rotary printing press according to claim 6, wherein the ink is brought into contact with a 1000 mm cooling cylinder. 8. In order to prolong the time in which the plurality of cooling cylinders are in contact with each other, an object to be printed entering the cooling section from the drying section is provided by moving in a direction approaching the center position. 7. A zigzag passage between the cooling cylinders, and more than half of the circumference of the first cooling cylinder with which the dried printing material comes into contact first is brought into contact with the printing material. An ink fixing method for an offset rotary printing press according to claim 7.