JPH0477253A - Obtaining printed matter with larger plate area than plate area of printing roll - Google Patents

Abstract

PURPOSE:To obtain printed matter with a larger printing pitch than the plate area of a printing roll by extending thermally plastic film in width direction using a belt pressure-holding transport-type film extending device so that a specified extension rate can be obtained, in a post- or pre-extension process. CONSTITUTION:A design for plate making compressed is prepared so that it is similar to an original design prepared to be equal to the unit printing pitch of a final printed matter, then a printing roll is made using said design for plate making and data is printed on thermally plastic film with the help of said printing roll using a printer. After the printed thermally plastic film is heated using a heating device, is is allowed to pass through paired pinch rolls which rotate at a different speed from each other. After that, said thermally plastic film is heated using a heater and then is extended at a specified extension rate using a belt pressure-holding transport-type film extending device so that the width of the thermally plastic film becomes the same as that of the mentioned original design.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention makes it possible to obtain various printed matter with printing rolls of the same size having a printing pitch and printing width larger than the plate area of the printing roll. This invention relates to a method for obtaining printed matter with a larger plate area than the plate area of a printing roll.

[Prior Art] Conventionally, regardless of the printing plate type such as intaglio, lithography, letterpress, or stencil, in rotary printing, in order to obtain a printed matter with a desired printing pitch, it is necessary to set a circumferential length that is the same as the printing pitch each time. For this reason, printing companies stock thousands to tens of thousands of printing rolls with different diameters in increments of approximately 1 cm in warehouses in order to meet the diverse demands of customers. If the printing pitch of the printed matter requested by the customer is, for example, 90 cm, a base roll with a diameter of 28 cm is used, and the printing plate surface is made by bulk plating (copper plating).

However, in the rotary printing system, there has been no method for obtaining various printed matter with a printing pitch and printing width larger than the plate area of the printing roll using the same printing roll. That is, when the size of the printed material requested by the customer is larger than the largest printing roll that can be processed by the printing company's plate-making machine and rotary printing press, printing is impossible.

[Problems to be Solved by the Invention] The present invention has been devised in view of the above-mentioned points, and utilizes a printing roll that has been widely used so far and a series of plate-making machines and printing machines that are intended for the printing roll. With the same size printing roll, it is possible to obtain various printed matter with printing pitches and printing strokes larger than the plate area of the printing roll. The present invention provides a method for obtaining a printed matter having a larger plate area than that of a printing roll.

[Means for Solving the Problems] As a means for solving the above-mentioned problems, the present invention heats a printed thermoplastic film using an appropriate heating means, and heats the thermoplastic film by heating the thermoplastic film in two pairs with different feeding speeds. The thermoplastic film is stretched in the length direction to the required bow stretching ratio by passing it through the pinch rolls of The present invention provides a method for obtaining a printed matter with a printing pitch larger than the plate area of a printing roll, characterized in that the thermoplastic film is stretched by a film stretching device to a required stretching ratio in the radial direction, and the method is the same. With a printing roll of size , it is possible to obtain various printed matter having a printing pitch and printing stroke larger than the plate area of the printing roll.

[Example] As a method of obtaining a printed matter with a larger printing area than the printing roll according to a preferred embodiment, the ratio of the circumferential length of the printing roll used to the unit printing pitch of the final printed matter is calculated, and the ratio of the circumferential length of the printing roll used is calculated. A prepress design is created that is compressed to have a similar shape at the above ratio to the original design created corresponding to the unit printing pitch of the final printed matter, and the printing roll is made using the prepress design. After making a plate, printing on a thermoplastic film using a printing machine using the plate-made printing roll, and heating the printed thermoplastic film with an appropriate heating means, the thermoplastic film is heated at the required feeding speed. By running it between two different pairs of pinch rolls,
The thermoplastic film is stretched at a required stretching ratio so that the unit printing pitch is the same as the length of the original design, and then, after heating the thermoplastic film with a heater, it is stretched with a belt pinch transfer type film stretching device. By stretching the thermoplastic film at a required stretching ratio so that the width of the thermoplastic film is the same as the width of the original design, a final printed matter having the same size as the original design is obtained. This will be explained in detail below.

Step - As shown in FIG. 1, first, an original design a having length Lxradius Wl is created. This is the same as the design A for 7 unit printed pages of the final printed matter shown in FIG. The creation of the original design a is carried out using conventional design work, and in addition to cases in which the design is a photograph or a hand-drawn design on paper, a photographic image or a hand-drawn design is read by a scanner and processed by an image processing device. This includes designs stored in storage devices and computer graphic designs created on a computer.

Second Step Next, a plate-making design a' having a length πD×radius W2 shown in FIG. 2 is created. In this case, D is the diameter precisely measured after the printing roll to be used is appropriately selected and plated. The plate-making design a'' has a circumferential length (πD) of the printing roll with respect to the length of the original design a shown in FIG.
) is calculated, and the length and width directions of the original design a are compressed by the ratio (=πD/L), resulting in a similar shape. If the original design a is a hard design, the original design a is compressed by a compression ratio πD/
To make the plate-making design a° reduced to a similar shape in L, it can be done by camera work, and if the original design a is a software design stored in a storage device, #
A compression ratio πD/
This can be easily processed by performing multiplication processing of L.

In the third step, a plate is made into a printing roll which has been subjected to two rounds of plate making using the plate making design a°. That is, for the printing roll, ■ photoresist film coating → image baking → development →
Etching → chrome plating process, or ■ Engraving halftone image with electronic engraving machine → chrome plating process.

Image printing in the process (2) includes printing using film and filmless printing using a laser plotter. In the case of continuous patterns, an endless plate-making method is used.

In the plate-making process, it is preferable to increase the density of one color as necessary to form a plate with high contrast in order to prevent a decrease in the color density of the printed matter and a soft design with small density difference in the final film stretching process. .

Incidentally, the plate making for the printing roll is not limited to a plated printing roll, and also includes the case where an image is directly formed on a plastic-coated printing roll with a laser plotter.

Fourth step: Subsequently, printing is performed on a thermoplastic film F such as polyethylene using a printing machine using the plate-made printing roll.
Obtain the print shown in the figure. Since the design printed on the thermoplastic film F is obtained by the plate-making design a shown in FIG. 2, it is naturally a design that is reduced to a similar shape to the original design a shown in FIG. , and is printed with a pitch of πD.

In this printing process, in conjunction with the plate-making process, ultraviolet drying ink (solvent-free ink) is used to prevent a decrease in the color density of printed matter and a soft design with small density difference in the final film stretching process. ), heat the printing roll to a required temperature, for example 50°C, to ensure a good ink scraping function of the doctor, and then dry the ink with an ultraviolet lamp to remove the ink printed on the thermoplastic film. Preferably, the thickness is several times that of conventional methods using solvent inks.

Fifth step Finally, the printed thermoplastic film F is stretched in the length direction as shown in FIG. 4 using the stretching device shown in FIG. A final printed product A is obtained.

The stretching device sets the printed thermoplastic film roll R, and passes the printed thermoplastic film F through the guide roll rl to the first vinyl roll r2. r2
After that, it is passed through a hood equipped with a heater H1, and then passed between a second vinci roll r3°13, and then a third vinci roll r4. r 4, and then pass it between the fourth vinyl rolls re and re via the guide roll r5,
The film is again passed through a hood equipped with a heater H2, passed between second pinch rolls R7 and 17, and further passed through a belt pinch transfer type film stretching device V, and then guided to a winding device K via a guide roll R8 and wound up. It looks like this.

And the first pinch roll r2.
r 2 and second pinch roll r 3. r3 is driven so that the film feed speed is the same, and the third,
Fourth and fifth pinch rolls r4. r4, r6. r 6
, r7. r7 and the winding device k are adapted to be driven.

The continuously variable transmission X is the third vinyl roll r4. The speed ratio of the film feed speed v4 of r 4 to the film feed speed v3 of the second vinyl roll r3° is L/πD (L is the length of the final print to be obtained, and D is the diameter of the printing roll used) It is set so that the speed increase value is as follows.

The belt pinch transfer type film stretching device V has a pair of left and right sides that are wound along the flow of the thermoplastic film above and below both edges of the thermoplastic film F stretched in the length direction. It has two pairs of endless belts, and the two pairs of left and right endless belts pinch both edges of the thermoplastic film F' to control the flow of the thermoplastic film so that the downstream side spreads in the conveying direction of each belt. By transferring the thermoplastic film at a required angle, the thermoplastic film can be stretched at a required stretching ratio so that the radius of the thermoplastic film becomes the same as the width of the original design.

Therefore, the thermoplastic film F on which the plate-making design a° is printed is heated to the required temperature by the heater H1, and then transferred to the second pinch roll r3. r 3 and third vintilol r
4. By being stretched in the length direction between r
Design a stretched to have the same length L as
”, and then heated to the required temperature with the heater H2, and then stretched in the width direction by the belt-pinch transfer type film stretching device (■) at the inverse ratio Lπ/D of the compression ratio πD/L. The design is the same as the width W1 of the original design a, and thus it is possible to obtain a final printed matter having the design A of the same size as the original design.

In addition, FIG. 6 shows a preferable belt pinching transfer type film stretching device V, in which a pair of upper and lower pels (top and bottom) are turned on the left and right by turning screw shafts Sl and s2 with reverse threads. The figure shows an apparatus in which the angle θ of the width of the width direction can be kept constant and changed freely, thereby allowing the stretching ratio in the width direction to be freely set.

[Effects of the Invention] As explained above, the method of obtaining a printed matter having a larger plate area than the printing roll of the present invention has the following effects.

(2) Using printing rolls of the same diameter, it is possible to obtain final printed matter of various scorch sizes with printing pitches and printing widths larger than the plate area of the printing rolls. The design of the final printed matter can not only be enlarged to have a similar shape to that of the printing plate, but also be produced as a printed matter whose printing pitch and printing width are enlarged at different ratios as desired.

■The diameter that printing companies traditionally have is relatively small (
Utilizing a series of plate-making machines and rotary printing machines that are intended for printing rolls (approximately 300 cm or less) that are larger than those printed by the largest printing rolls that the plate-making machines and rotary printing machines are capable of processing. can be produced.

■Since printing rolls of the same size can be used to obtain printed matter of various sizes that are larger than the plate area of the printing roll, it is not necessary to prepare printing rolls with different diameters in 1cm increments as in the past. For example, it is now possible to prepare printing rolls with different diameters in 5cm increments, which greatly reduces the number of idle rolls, reduces warehouse space, and significantly reduces roll purchase costs. can.

[Brief explanation of drawings]

Figure 1 is a surface view showing the original design that is first created, Figure 2 is a surface view showing the design for plate making in which the length direction of the original design has been compressed to the required ratio, and Figure 3 is plate making on thermoplastic film. 4th surface view showing the printed design for
The figure is a surface view showing a part of the final printed matter obtained by stretching the thermoplastic film on which the design for plate making has been printed, and FIG. 5 is a schematic front view of a stretching device for the printed thermoplastic film. FIG. 6 is a plan view of a hood equipped with a heater and a belt pinch transfer type film stretching device. 80...Final printed matter, F...Printed thermoplastic film, r3. r3 m e e second pinch roll, r 4.
r 4...Third vinyl roll, ■...Belt pressure transfer type film stretching device, patent applicant Meiwa Gravure Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Procedure amendment form 1990 November 27, 1990 Patent Application No. 189847 Name of the invention Printing surface larger than the printing roll Method for obtaining my printed matter Relationship with the case of person who makes an amendment Patent applicant address Aida Higashimachi, Higashiosaka City, Osaka Prefecture 12 No. 28 name
Meiwa Gravure Co., Ltd. (1 other person) Representative Director and Vice President Oshima Political Opponent Agent Postal Code 277 Location 0471 (66)
2788 Address Sakura House 2, 7-6 Sakuradai, Ai City, Chiba Prefecture
F Name: Patent Attorney (8124) Koji Onuma - Contents of the amendment in the fields 1) Power of attorney to be amended and detailed explanation of the invention in the specification 1) A separate power of attorney has been attached. 2) rlcmJ on page 2, line 11 of the specification,
Correct it as FlmmJ. 3) Correct r28cmj on page 2, line 14 of the specification to F 282 mmJ. "Sa," he corrected. 5) On page 8, line 6 of the specification, r polyethylene j is corrected to r vinyl chloride j. 6) In the 9th line of page 11 of the specification, the ``Inverse ratio Lπ/DI'' is corrected to ``Inverse ratio L/πDJ.'' 7) In the 15th line of Page 11 of the specification, 1 inverse ratio Lπ /DJ should be corrected as l'r inverse ratio L/D1. Address of patent applicant other than above 610-1 Umebayashi, Ai City, Chiba Prefecture Name Think 0 Laboratory Co., Ltd. Representative Director Tatsuo Shigeta

Claims (1)

[Claims] By heating a printed thermoplastic film with an appropriate heating means and running the thermoplastic film between two pairs of pinch rolls having different feeding speeds, the thermoplastic The film is stretched in the length direction to a required stretching ratio, and as a post- or pre-stretching process, the thermoplastic film is stretched in the width direction to the required stretching ratio using a belt pinch transfer type film stretching device. A method for obtaining a printed matter with a printing pitch larger than the plate area of a printing roll, which method comprises stretching the printed matter so that the printing pitch becomes larger than the plate area of the printing roll.