JP3334482B2 - Printing method for web offset press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a printing method for an offset rotary press.

[0002]

2. Description of the Related Art In a conventional offset rotary press, printing is performed by using winding according to a printable paper width according to specifications. Accordingly, offset rotary presses have been used only for printing using winding in accordance with the printable paper width according to specifications.

[0003]

In the conventional offset rotary press, printing can be performed only by winding according to the printable paper width according to specifications. The equipment of the offset rotary press may be arranged only within the range that can satisfy the specifications, but if the width is reduced to less than half of the maximum printable paper width, the area where blankets contact each other increases, and printing occurs due to heat generation. This is because failures occur and the life of the blanket is shortened. For this reason, for example, in a double-width offset rotary press, only the printing of a double-width paper roll can be used. However, in recent years, small lots of printed materials have been
The efficiency of a double-width offset rotary press is reduced, and a situation in which the web offset press cannot operate sufficiently is occurring. The present invention has been made under the above circumstances, and an object of the present invention is to provide a roll having a paper width equal to or less than half the maximum paper width that can be printed on an offset rotary press.
To provide a printing method for an offset rotary press characterized in that printing can be performed without increasing the area where the blankets come into contact with each other, preventing a printing failure due to heat generation, or shortening the life of the blanket. is there.

[0004]

According to the present invention, there is provided an offset rotary press including a sheet feeding device, an infeed device, a printing unit, a drying device, a cooling device, and a folding machine. A method for printing a roll having a paper width equal to or less than half of a maximum paper width printable by the offset rotary press, wherein the printing is performed by mounting a blanket having a lateral width slightly larger than a substantially print paper width. The printing method. As a result, even when the paper width is equal to or less than half of the maximum printable paper width, the area where the blankets contact each other does not increase, and it is possible to perform printing while preventing a print failure due to heat generation or shortening the life of the blanket. .

[0005]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic explanatory view of a double-width offset rotary press. The double-width offset rotary press according to the present invention includes a sheet feeding device 1, an infeed device 2, a printing unit 3, a drying device 4, a cooling device 5, and a folder 6. The printing unit 3 is provided with a blanket for full width.

The printing paper 7 unwound from the paper feeding device 1 is
It passes through the infeed device 2 to the printing unit 3. The printing unit 3 prints the required number of colors. The printing paper 7 printed by the printing unit 3 is passed through the drying device 4. The printing paper 7 dried by the drying device 4 is cooled by the cooling device 5 to fix the ink. The printing paper 7 that has passed through the cooling device 5 enters the folding machine 6, where it is folded to form a printed book. The web offset press embodying the present invention is not limited to a double-width web offset press, and can be wound on a web offset of any width, such as a full-width web offset press, with a paper width equal to or less than half the maximum printable web width. Is also possible.

FIG. 2 is a schematic explanatory diagram of a full-width offset rotary press. A full-width offset rotary press that implements the present invention is:
It comprises a sheet feeding device 1, an infeed device 2, a printing unit 3, a drying device 4, a cooling device 5, and a folder 6. A blanket for half width is mounted on a blanket cylinder in the printing unit 3. At this time, the mounting position of the blanket is not particularly limited, and may be mounted at a position where the printing paper 7 can be easily passed. The take-up is set in the sheet feeding device 1. If the take-up position is set to be an extension of the position of the blanket attached to the blanket cylinder in the printing unit 3, there is no need to shift the printing paper 7 before entering the printing unit 3, and stable printing can be performed. .

The printing paper 7 unwound from the paper feeding device 1 is
It passes through the infeed device 2 to the printing unit 3. The printing unit 3 prints the required number of colors. The printing paper 7 printed by the printing unit 3 is passed through the drying device 4. The printing paper 7 dried by the drying device 4 is cooled by the cooling device 5 to fix the ink. The printing paper 7 that has passed through the cooling device 5 enters the folding machine 6, where it is folded to form a printed book. The web offset press embodying the present invention is not limited to a full width web offset press, and can be wound on a web offset of any width, such as a double width web offset press, with a paper width equal to or less than half the maximum printable web width. Is also possible.

[0010]

The present invention will be described in detail with reference to the following examples. First Embodiment FIG. 1 is a schematic explanatory diagram of a double-width offset rotary press. The double-width offset rotary press includes a sheet feeding device 1, an infeed device 2, a printing unit 3, a drying device 4, a cooling device 5, and a folding device 6.
Consists of The blanket cylinder in the printing unit 3 was provided with only one blanket of the full-width offset rotary press on the drive side. The take-up was carried out using a take-up having a basis weight of 70 g / m 2 over the entire width, and the feeder 1 was mounted on the driving side so as to be an extension of the position of the blanket attached to the blanket cylinder in the printing unit 3. The printing paper 7 unwound from the paper feeding device 1 passes through the infeed device 2 and is passed to the printing unit 3 so that printing of four colors on the front and back sides is performed. The printing paper 7 on which printing has been performed by the printing unit 3 is passed through a drying device 4 and, after being dried, is cooled by a cooling device 5 to fix the ink. The printing paper 7 that has passed through the cooling device 5 enters the folding machine 6, where it is folded to form a printed book.

[0011]

According to the printing method of an offset rotary press according to the first aspect of the present invention, a full-width web can be printed by a double-width web offset press, and a half-width web can be printed by a full-width web offset press. Therefore, various uses are possible with one offset rotary press. As a result, the operation rate of the offset rotary press can be improved by selectively using the offset rotary press according to the work of winding the paper width to be printed, and the production efficiency can be increased by increasing the production amount.

[0012]

[0013]

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a double-width offset rotary printing press according to a printing method of the present invention.

FIG. 2 is a schematic explanatory view of a full-width offset rotary printing press according to the printing method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Paper feed device 2 ... Infeed device 3 ... Printing unit 4 ... Drying device 5 ... Cooling device 6 ... Folding machine 7 ... Printing paper 8 ... Double width offset printing machine 9 ... Full width offset Printer

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masashi Sugimura 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. Examiner Nobuhiko Koizumi (58) Field surveyed (Int. Cl. ⁷ , DB name) B41F 7/00-7/02

Claims (1)

(57) [Claims] 1. An offset rotary press comprising a sheet feeding device, an infeed device, a printing unit, a drying device, a cooling device, and a folding machine, wherein a roll having a paper width equal to or less than half the maximum paper width printable by the offset rotary press. A method of printing a bird,
A printing method for an offset rotary press, wherein printing is performed by mounting a blanket having a paper width slightly larger than a substantially printing paper width.