JPS5919154A - Printing method of continuous sheet - Google Patents

Abstract

PURPOSE:To easily print a pattern with arbitrary dimensions on a continuous sheet without cutting the sheet or generating useless blanks, by a method wherein a continuous sheet is intermittently supplied by a predetermined length at a time, and a printing plate is brought into the sheet at the time of intermittently supplying the sheet. CONSTITUTION:Sections A, B, C of the continuous sheet constitute prescribed printing regions, in which printing is conducted to produce printed matters A1, B1, C1. The dimension L in the feed direction of the prescribed printing region and an actual printing length l are in the relationship of L>=l, and the printing length l substantially accords with an arch length dimension piD of the printing plate 18. A cylinder 22 is rotated in the direction of an arrow, whereby the continuous sheet 20 is intermittently supplied under tension by the diemsion L of the region at a time by clamping it between an arcuate pulling member 24 (the arch length dimension is adjustable) and a press roller 26, and then the printing plate 18 fitted to a form cylinder 16 is brought onto the sheet when the sheet is supplied in the intermittent manner, resulting in the objective printing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing method capable of printing any size on a continuous sheet, and more specifically, it relates to a printing method capable of printing any size on a continuous sheet, and more particularly, it relates to a printing method that can print any size within the range of the circumferential size of the plate cylinder of a rotary printing press. In print length,
The present invention relates to a novel printing method that can sequentially perform desired printing on each printing scheduled section of a web or other continuous sheet.

In a rotary printing press, a long continuous sheet is fed between a plate cylinder equipped with a curved printing plate and an impression cylinder, and printing is performed by the pressure between the two cylinders. The size of the printing surface is generally determined by the circumferential dimension of the plate cylinder. In other words, it is impossible to print anything larger than the total circumference of the plate cylinder, and it is not possible to print a printing plate whose circumference is less than the total circumference of the plate cylinder.
Although TLF printing is possible, there is a disadvantage that there is a large amount of wasted waste because a margin is created between the IEIJ prints of the continuous sheet 1 every time the plate cylinder rotates. In order to deal with this drawback, the supplied continuous sheets are cut into appropriate sheets using a cutting device, and a printing plate with a size corresponding to the paper size is attached to the plate cylinder. An all-size rotary press for printing has been proposed, but since this is based on the premise of sheet cutting before printing, it cannot be said that it can print on continuous sheets, and it cannot be said to print at high speed. “It is not suitable for the 11th printing.

Furthermore, as another means of printing by any method without cutting the continuous sheet 1-, a desired mark 11 =J'
It is conceivable to replace plate cylinders with circumferential dimensions corresponding to the law each time, but in this case, a desired number of plate cylinders with different circumferential dimensions must be prepared, and the manufacturing cost for monthly LIF will rise. At the same time, the structure of the printing machine becomes complicated and the number of steps involved becomes complicated, making it extremely difficult to realize. In this way, in rotary printing on continuous sheets, the circumferential dimension of the plate cylinder generally determines the printing length on the sheets 1 to 1, so it is possible to print at any printing length (of course within the range of the circumferential dimension of the plate cylinder). ), and it was impossible to perform printing sequentially without creating wasteful margins between each printing.

However, it is difficult to perform high-speed printing on roll paper or other continuous sheets at arbitrary printing lengths without cutting them.
This has been requested in industry for some time. -For example,
A corrugator line that continuously produces corrugated cardboard uses a long rolled core paper and a liner, and the liner is adhesively laminated to the top of the corrugated corrugated corrugated core paper to produce single-sided corrugated cardboard or Although double-sided corrugated cardboard is manufactured, printing on the resulting corrugated cardboard is not carried out in a corrugator line, but after it is cut to a predetermined size and made into sheet-fed corrugated cardboard. By the way, taking double-sided corrugated cardboard as an example, as shown in FIG.
2 are mutually joined by a core paper 14 with a corrugated core 1-, and the outer liner 10 and the back liner 1
2 becomes Franc 1. However, each liner has a portion a that is supported by the corrugated top portion (so-called peak portion) of the core paper and a so-called valley portion that is not supported by the corrugated top portion. Printing pressure is not applied, which tends to cause shading and color unevenness.

For this reason, in order to print clearly and uniformly on corrugated cardboard, it is best to print on the liner that is in the continuous sea 1~ state before laminating the liner and core paper. However, apart from cases in which printing is performed repeatedly in accordance with the circumferential dimensions of a cylinder (for example, using a hinoki machine), it is not possible to print on a liner at high speed without creating a margin with an arbitrary printing length. was impossible, and its realization was long awaited.

In addition, if the corrugated cardboard is formed and then passed through a rotary printing machine and compressed between a plate cylinder and an impression cylinder, there is a concern that the compressive strength of the corrugated cardboard itself will decrease. If this is done, such concerns will be completely eliminated, which is desirable from this point of view as well.

The present invention has been devised in view of the drawbacks inherent in the prior art, and allows printing at any printing length in a continuous state without cutting the web or other continuous sheet. Moreover, it is an object of the present invention to provide a continuous sheet rotary printing method in which wasteful margins are not generated between adjacent printed matter.

In order to achieve this object, the printing method according to the present invention is characterized in that when a continuous sheet is passed through a printing section where a plate cylinder and an impression cylinder face each other for printing, the arc length dimension of the printing plate attached to the plate cylinder is The continuous sheet is intermittently supplied to the printing unit by a predetermined length that is the same or larger, and printing is performed by bringing a printing plate onto the continuous sheet during the intermittently feeding of the continuous sheet 1-. do.

Next, the printing method according to the present invention will be described in detail below with reference to the accompanying drawings. As an example, the description will be made in relation to a corrugator line for manufacturing corrugated board, but the present invention is not limited to this and can be widely applied to printing of webs such as general paper rolls, resin films, and other continuous sheets. Of course you can get it.

The printing method according to the present invention is suitably carried out using a multi-color rotary printing press with two or more colors, but for convenience of explanation, the printing method will be described using a case where it is carried out with a single rotary printing press as an example. Make it. That is, FIG. 2 shows each mode when printing is performed by the printing method according to the present invention in an intermittent state with time (D to ■), and the symbols 1
Reference numeral 6 indicates a plate cylinder of a rotary printing press, and 18 indicates an arc-shaped printing plate attached to this plate cylinder 16, and the arc length dimension of the printing plate 18 is 1/4 of the circumference dimension πD of the plate cylinder 16. It is assumed that this has been set. Reference numeral 20 indicates a continuous sheet to be printed, and in the plan view of the continuous sheet 20 shown below, the planar state of the continuous sheet 2o is divided by vertical lines. Each section A, B, C
,... are the areas where printing is planned, and by printing in these areas, printed matter A,, B,, C
,,... becomes. In addition, in the illustrated case, the dimension in the flow direction of the planned printing area is larger than the actual printing length 1, but in the case of full-page printing, the area dimension is equal to the printing length 1 (■-≧, I2). . In addition, the printing length 1 is the printing plate 1
This approximately corresponds to the arc length dimension (7CD) of No.8.

In FIG. 3, as means for intermittently tensioning and supplying the continuous sheet 20 according to the area size, an arc-shaped tensioning member is arranged in the circumferential direction of a circle M22 and the cylinder 22 so that the arc length dimension can be freely adjusted. 24 and a suppressing roller 26 disposed below opposite to the circle WR22 is disposed forward in the feeding direction of the printing plate M416. That is, in FIGS. 2 and 3, the arc length dimension of the tension member 24 is set equal to the dimension in the machine direction of the printing area, and therefore the cylinder 2
It will be understood that if the continuous sheet 20 is rotated in the direction of the arrow and the continuous sheet 20 is pinched by the tension member 24 and the pressure roller 26, the continuous sheet 20 will be intermittently pulled and supplied in the direction of the arrow by the above dimension length. .

Then, during this continuous sheet 1 - intermittent supply, so that the printing plate 18 attached to the first plate cylinder 16 arrives on the continuous sheet 20.
All you have to do is perform appropriate timing control. One embodiment of the printing method according to the present invention will be described with reference to FIGS. 2 and 3. In FIG. 1-20, clamps the sheet 1-20 together with the pressing roller 26, and starts pulling the sheet 1-20 in the direction of the arrow. At this time, the leading end of the printing plate 18 mounted on the printing cylinder 16 has arrived at a position slightly before the predetermined printing contact position C, but the tip of the printing plate 18 attached to the printing cylinder 16 has reached the position C.
20 (note that the arc long distance between b and c is the vertical margin dimension d in each printed matter A+ 9 B+ + C+ 9...).

Next, as the cylinder 22 rotates clockwise, the sheet 20 is pulled forward in the direction of the arrow as shown in FIG. The printer arrives and printing begins. Furthermore, through the processes shown in FIG. 2 (1) to (2), the continuous sheet 20 is stretched and fed by the arc length dimension of the tensioning member 24, and as a result, printed matter A having a printing length of 1 is completed.

As shown in FIG.
0, the progress is stopped instantly. However, the plate cylinder 16 and the cylinder 22 (both of which are designed to have the same diameter and rotate at the same speed) continue to rotate regardless of the stoppage of supply of the continuous sheet 20, and again as shown in FIG. Repeat the steps shown in (1) to (2). For this reason, the sheet 20 is intermittently fed by a predetermined size in the direction of the arrow, and the printing unit where the plate 1Ilii 16 and the impression cylinder face each other is moved every time the next printing area B, C, . . . arrives intermittently. Printing with a printing length of 1 is applied to each area, and prints B+ that are adjacent to each other in the longitudinal direction on the same sheet I~
I C+ 1... is obtained.

FIG. 4 shows an example of the arrangement of a rotary printing press (hereinafter referred to as a preprinting apparatus) in the case where this printing method according to the present invention is carried out in a corrugator line for manufacturing corrugated board. FIG. 4 shows a preprint device 28 installed in a double backer machine for manufacturing double-sided corrugated cardboard, in which a first single-sided corrugated cardboard 30 and a second single-sided corrugated cardboard 32 are transferred on a compare 34, and For example, the liner 36 is 2
Preprint device 28 consisting of a base plate cylinder 38 and an impression cylinder 40
During the passage, printing is performed with a printing length of arbitrary size. Next, the first and second single-sided corrugated boards 30 and 32 pass through a 1-ribrex heater 42 to be preheated and humidity controlled, join with the printed liner 36 in a glue machine 44, and are laminated with glue. Heating section 46 consisting of a box and hot plate
It is heated and pressed.

In addition, since the printing method according to the present invention is capable of printing a continuous sheet 1- with a printing length of 1° using the flat knee method, it is possible to print on the front liner after manufacturing a continuous corrugated board. It's okay. For example, in Figure 5, continuous corrugated cardboard 4
After passing through the double facer 50, C1 enters the Surinotascorer device 52 and is printed at an arbitrary printing length of 1° by the preprinting device @28 installed here. In this case, the continuous corrugated board 48 that has undergone predetermined printing via the preprint device 28 is subjected to predetermined slit processing and ruled line processing by a slitter scorer device 52 that operates simultaneously in accordance with the printed sections.

A correspondingly synchronized cutter 54 cuts the material into temporary balls of a predetermined length.

As described above, according to the printing method of the present invention, when printing on a continuous sheet, the continuous sheet is intermittently fed by a predetermined length while the plate cylinder is always rotating at a constant speed, and the continuous sheet is intermittently fed by a predetermined length. Since printing is performed by bringing the printing plate onto the sheet, it is possible to print at any printing length while the continuous sheet is in a continuous state without cutting it. (The printing length is determined by the length of the printing plate attached to one printing cylinder, and is therefore limited to the circumferential dimension of the printing cylinder).Moreover, the printing length is determined by the length of the printing plate attached to one printing cylinder, and is limited to the circumferential dimension of the printing cylinder). This has many beneficial effects, such as eliminating unnecessary blank spaces between... The present invention is suitably used for printing on continuous liners in corrugator lines for producing corrugated board.
In addition, it can be widely applied to printing long films, fabrics, webs, etc. at arbitrary printing lengths.

Fig. 1 is a sectional view of double-sided corrugated board, Fig. 2 is an explanatory diagram schematically showing the printing process in each mode for carrying out the printing method according to the present invention, and Fig. 3 is an apparatus for carrying out the method of the present invention. 4 and 5 are schematic diagrams of a case where a preprint device is installed in a corrugator line to carry out the printing method according to the present invention.

10... Front liner 12... Back liner 14
... Core paper 16 ... Plate cylinder 18 ...
Printing plate 20...Continuous sheet 22...Cylinder 24...Tension member 26...Press roller 28 Preprint device 30.32...Single-sided corrugated board.

34... Conveyor 36... Liner 38...
... Plate cylinder 40 ... Impression cylinder 42 ... Triplex heater 44 ... Glue machine 46 ... Heating sexigon 48 ... Continuous corrugated board 50 ... Double facer 52 ... Slitter scorer device 54 ... Cutter

Claims (1)

[Claims] When printing by passing a continuous sheet through a printing section where a plate cylinder and an impression cylinder face each other, the continuous sheet is passed intermittently by a predetermined length that is the same as or larger than the arc length of the printing plate attached to the plate cylinder. A method for printing a continuous sheet, characterized in that the continuous sheet is supplied to the printing unit at intervals, and printing is performed by bringing a printing plate onto the continuous sheet during intermittent feeding of the continuous sheet.