WO2017177760A1

WO2017177760A1 - Sheet-fed flexo printing machine

Info

Publication number: WO2017177760A1
Application number: PCT/CN2017/073585
Authority: WO
Inventors: 马立项; 吴金平
Original assignee: 南京造币有限公司; 中国印钞造币总公司
Priority date: 2016-04-11
Filing date: 2017-02-15
Publication date: 2017-10-19
Also published as: EP3444115A1; JP6408170B2; CN107160827A; EP3444115B1; JP2018514415A; EP3444115A4; CN107160827B

Abstract

A sheet-fed flexo printing machine comprises a first printing unit and a second printing unit for respectively printing on two surfaces of a material to be printed. The first printing unit comprises a first stamping roller (1), a first printing sheet transfer roller I (2), and a first printing sheet transfer roller II (3); the second printing unit comprises a second stamping roller (4), a second printing sheet transfer roller I (5), and a second printing sheet transfer roller II (6). The first printing sheet transfer roller I (2), the first printing sheet transfer roller II (3), the second printing sheet transfer roller I (5), and the second printing sheet transfer roller II (6) are configured as rollers with temperature control or quality inspection means. An even number of printing sheet transfer rollers are separately provided between and after the printing units corresponding to two surfaces of a material to be printed. On the one hand, printing on the two surfaces of the material to be printed is ensured by means of an even number of sheet transfer procedures, and on the other hand, by additionally endowing the printing sheet transfer rollers with a temperature control function and a borne material quality inspection function, the heat accumulation problem and the timeliness problem in quality control of a material to be printed are solved.

Description

Sheetfed flexo printing machine

Technical field

The invention relates to the technical field of printing equipment, and in particular to a sheet-fed flexographic printing machine.

Background technique

In the existing flexographic printing presses, especially the double-sided flexographic printing presses, in order to meet the requirements of increasing production efficiency, it is necessary to perform drying and curing of the printing surface ink immediately after each printing, in order to perform the next or next printing operation. . The existing rapid drying technology of printed matter adopts the principles of hot air, infrared or ultraviolet light drying and curing to achieve rapid drying of printed products. The above drying methods will have a thermal effect on the surface of the printed product, which may cause the temperature of one side of the printed product to rise and slightly warp, which may cause significant deformation of the printed product. In special cases, even the coking of the printed product may be caused. Or burn. In addition, in the case of continuous improvement in the quality of printing production, the user has put forward requirements for the online quality inspection system for printing equipment. The existing flexographic printing machine still has insufficient considerations in the configuration of the online inspection system for printing quality.

Figure 4 is a flow chart showing a conventional double-sided flexographic printing press in which two printing color groups corresponding to two sides of a print are sequentially connected. After the first side (A side) is printed and dried by the drying device, the other side (B side) is printed and dried and solidified, and then the quality inspection of the two printing surfaces is performed on the inspection roller, respectively. The structure has the problem of continuous drying and heat accumulation of the printed matter, and the deformation caused by the overheating of the printed product affects the printing quality, and is not conducive to the neat collection of the printed product. In addition, in the printing machine structure adopting this process, the online inspection on both sides of the printed product is performed after two printings are completed, so that the quality problem of the first side printing needs to be obtained after the second side printing is completed, so the quality is There is a lack of timeliness in control.

FIG. 5 is a schematic view showing the arrangement structure of the printing unit drum of the conventional double-sided flexographic printing machine. The printing unit drum arrangement structure conforms to the printing flow shown in FIG. 4, and the flexographic printing machine continuously prints on both sides of the printing product. In the way, the above-mentioned problems of heat accumulation of printed products and timeliness of quality control of printed products exist in the production process.

Summary of the invention

In order to overcome the deficiencies of the prior art described above, the present invention provides a sheet-fed flexographic printing press that reduces the thermal accumulation of prints and the problem of timely finding print quality.

A technical solution for achieving the object of the present invention is: a sheet-fed flexographic printing machine comprising a first printing unit and a second printing unit for respectively printing two surfaces of a substrate, the first printing unit comprising a first printing cylinder First printing pass a first printing cylinder 2 and a first printing cylinder II, the second printing unit comprising a second impression cylinder, a second printing paper cylinder I and a second printing paper cylinder II, a first printing paper roller I and a first printing paper The paper cylinder II is disposed between the first impression cylinder and the second impression cylinder, and the second printing paper cylinder I and the second printing paper cylinder II are disposed behind the second impression cylinder, the first printing paper cylinder I The first printing paper conveying roller II, the second printing paper conveying roller I and the second printing paper conveying roller II are provided as a drum having a temperature control or quality inspection device, and the temperature controlled roller has a temperature adjustment for the flow of the liquid medium inside. The control mechanism, the drum having the quality inspection device, is a drum to which the photovoltaic device or the camera is mounted.

As an optimization scheme of the present invention, the first printing paper transfer roller I and the first printing paper conveying roller II are externally provided with a first inspection device, and the second printing paper transfer roller I and the second printing paper roller roller 2 are externally provided with a second The inspection device, the first inspection device and the second inspection device are both used to check the material or print quality of the substrate transferred from the front end.

As an optimization scheme of the present invention, the first impression cylinder, the first printing paper roller I, the first printing paper roller II, the second impression cylinder, the second printing paper roller I and the second printing paper roller II The inside of the device is equipped with a caries mechanism for holding the substrate.

As an optimization of the invention, the first impression cylinder and the second impression cylinder have a temperature adjustment control mechanism for the flow of the liquid medium.

As an optimization of the present invention, at least one first flexographic printing cylinder for mounting a flexo is disposed on the first impression cylinder, and the first flexographic printing cylinder is provided with a corresponding first ink supply system, and the second imprinting At least one second flexographic printing cylinder for mounting a flexo is disposed on the drum, and the second flexographic printing cylinder is configured with a corresponding second ink supply system.

As an optimization scheme of the present invention, a first printing ink drying and curing device is disposed outside the first impression cylinder, and a second printing ink drying and curing device is disposed outside the second impression cylinder.

As an optimization of the invention, the front end of the first printing unit is provided with an input paper feeding device.

As an optimization scheme of the present invention, a multi-storage paper take-up device is disposed at the rear end of the second printing unit.

The invention has a positive effect: the invention installs two sets of four printing paper rollers respectively between the units where the two impression cylinders are located and after the unit, and these printing paper rollers can be set with temperature control and quality. Check the required rollers. The temperature control function is set on the printing paper roller to reduce the heat accumulation of the printed product, creating conditions for the control of the printing quality and the neat collection of the printed product; installing the quality inspection device on the printing paper roller can be based on the quality. The inspection needs, the inspection requirements for different quality inspection features or optical features on both sides of the printed product, and the scope of inspection is expanded. At the same time, the addition of inspection devices between the units also provides conditions for timely feedback on the quality of printed products, such as printing on the first side. After the brush, when the inspection finds that there is a quality problem, it can be set to timely alarm, stop, print cylinder pressure or separate collection of printed products, etc., to reduce unnecessary waste of printed materials and substrates.

DRAWINGS

In order to make the content of the present invention easier to understand, the present invention will be further described in detail below in accordance with the specific embodiments and the accompanying drawings.

Figure 1 is a structural view of the present invention;

Figure 2 is a diagram of an embodiment of the present invention;

Figure 3 is a flow chart of the operation of the present invention;

Figure 4 is a flow chart of a conventional double-sided flexographic printing machine;

Fig. 5 is a schematic view showing the arrangement of the printing unit drum of the conventional double-sided flexographic printing machine.

Wherein: 1, the first impression cylinder, 2, the first printing paper roller I, 3, the first printing paper roller II, 4, the second impression cylinder, 5, the second printing paper roller I, 6, a second printing paper transfer roller II, 7, a first inspection device 8, a second inspection device 9, a first flexographic printing cylinder, 10, a first ink supply system, 11, a second flexographic printing cylinder, 12 a second ink supply system, 13, a first printing ink drying and curing device, 14, a second printing ink drying and curing device, 15, an input paper feeding device, 16, a multi-storage paper delivery device, 17, a flexographic printing cylinder.

detailed description

As shown in FIG. 1, the present invention discloses a sheet-fed flexographic printing machine comprising a first printing unit and a second printing unit for respectively printing two surfaces of a substrate, the first printing unit including the first printing unit. a drum 1, a first printing paper transport roller I2 and a first printing paper transport roller II3, the second printing unit comprising a second printing cylinder 4, a second printing paper transport roller I5 and a second printing paper transport roller II6, the first printing The transfer cylinder I2 and the first transfer transfer cylinder II3 are disposed between the first impression cylinder 1 and the second impression cylinder 4, and the second printing transfer cylinder I5 and the second printing transfer cylinder II6 are disposed at the second pressure After the printing cylinder 4, the first printing paper conveying roller I2, the first printing paper conveying roller II3, the second printing paper conveying roller I5 and the second printing paper conveying roller II6 are provided as a drum having a temperature control or quality inspection device, having a temperature The controlled drum has a temperature adjustment control mechanism for the flow of the liquid medium, and the drum with the quality inspection device is a drum to which the photovoltaic device or the camera is mounted. Connect the optoelectronic device or camera to an analysis device such as a computer to view the print quality of the paper in real time.

In the drum arrangement structure, two (even) are installed between and after the printing units corresponding to the two surfaces of the printed product. Printing paper transfer roller, on the one hand, guarantees the printing of the two sides of the printed product by the even number of times of paper transfer, and on the other hand, solves the heat of printing by adding a temperature control function and a quality inspection function to the printed paper transfer cylinder. Accumulation and quality control timeliness issues.

a first inspection device 7 is disposed outside the first printing paper transport roller I2 and the first printing paper transport roller II3, and a second inspection device 8 is disposed outside the second printing paper transport roller I5 and the second printing paper transport roller II6. Both the inspection device 7 and the second inspection device 8 are used to inspect the material or print quality of the substrate transferred from the front end in the forward direction, and both the first inspection device 7 and the second inspection device 8 are used to check the transfer of the front end adjacent direction. The quality of the substrate, wherein the first inspection device 7 and the second inspection device 8 can be high-speed cameras, and the quality of the print can be checked by connecting the high-speed camera to the computer.

The inside of the first impression cylinder 1, the first printing paper roller I2, the first printing paper roller II3, the second impression cylinder 4, the second printing paper roller I5, and the second printing paper roller II6 are installed inside. The present invention is mainly applicable to a sheet-fed double-sided flexographic printing machine, and therefore is provided in an empty space of a drum, such as an impression cylinder, a printing transfer cylinder, and the like, which involves paper clamping and transfer. The caries mechanism that holds the substrate.

The first impression cylinder 1 and the second impression cylinder 4 have a temperature adjustment control mechanism for the flow of the liquid medium. At least one first flexographic printing cylinder 9 for mounting a flexo is disposed on the first impression cylinder 1, and the first flexographic printing cylinder 9 is provided with a corresponding first ink supply system 10, and the second impression cylinder 4 At least one second flexographic printing cylinder 11 for mounting a flexo is disposed, and the second flexographic printing cylinder 11 is provided with a corresponding second ink supply system 12. Wherein, the first ink supply system 10 and the second ink supply system 12 are an anilox roller ink supply system.

The invention can perform flexographic printing on both sides of the printed product, and needs to adopt a fast drying and curing type ink, and is equipped with a corresponding drying and curing device, and the first printing cylinder 1 is externally disposed with a first printing ink drying and curing device 13, The second impression cylinder 4 is externally disposed with a second printing ink drying and curing device 14, and the rapid drying and solidification method causes a certain amount of heat radiation, which causes the temperature of the roller and other parts and the printed product to rise, so as to avoid the temperature rise and cause the mechanical parts. Effects and resulting print quality problems in the first impression cylinder 1, the first printing transfer cylinder I2, the first printing transfer cylinder II3, the second impression cylinder 4, the second printing transfer cylinder I5 and the second The inside of the printing paper roller II6 is designed with a pipeline for the flow of the liquid medium, and the temperature control of the liquid medium and the flow of the liquid medium can be externally controlled to control the temperature of the drum and the printing product.

Figure 3 is a schematic illustration of a printing process for printing using the present invention, which illustrates a sequential flow of double-sided printing, dry curing, cooling, and quality inspection of the printing press. By using this printing, drying, cooling and quality inspection process, double The problem of heat accumulation and quality control timeliness of printed flexo printing will be better solved.

As shown in FIG. 2, the substrate is first transferred to the first impression cylinder 1 by the paper feed roller, and sequentially passes through the first flexographic cylinder 9 and the flexographic cylinder 17 to complete the two-color overprint printing of the first surface of the print. Then, the ink is dried and solidified by the first printing ink drying and curing device 13, and then cooled by the first printing paper transfer roller I2, and transferred to the second impression cylinder 4 through the first printing paper transfer roller II3 to complete the other side. The two-color overprinting is completed by the second printing ink drying and curing device 14 to dry and solidify the ink, and then cooled by the second printing paper conveying roller I5 and the second printing paper conveying roller II6, and finally the paper is discharged. In this process, the two-sided printing can be quality checked and controlled by the first inspection device 7 and the second inspection device 8, respectively, to ensure the quality of the printed product. Further, an input paper feeding device 15 is provided at the front end of the first printing unit, and a multi-storage paper delivery device 16 is disposed at the rear end of the second printing unit. It is convenient to print large quantities of paper by setting the input paper feeding device 15 and the multi-storage paper delivery device 16.

The specific embodiments of the present invention have been described in detail, and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A sheet-fed flexographic printing machine comprising a first printing unit and a second printing unit for respectively printing two surfaces of a substrate, wherein the first printing unit comprises a first impression cylinder (1) ), a first printing transfer cylinder I ( 2 ) and a first printing transfer cylinder II ( 3 ), said second printing unit comprising a second impression cylinder ( 4 ), a second printing paper roller I (5) And a second printing paper transfer roller II (6), the first printing paper transfer roller I (2) and the first printing paper transfer roller II (3) are disposed on the first impression cylinder (1) and the second Between the impression cylinders (4), the second printing paper transfer roller I (5) and the second printing paper transfer roller II (6) are disposed behind the second impression cylinder (4), the first The printing paper transport roller I (2), the first printing paper transport roller II (3), the second printing paper transport roller I (5) and the second printing paper transport roller II (6) are provided with a temperature control or quality inspection device The drum having a temperature control has a temperature adjustment control mechanism for flowing a liquid medium, and the drum having the quality inspection device is equipped with a photoelectric device or phase Drum.
A sheet-fed flexographic printing machine according to claim 1, wherein said first printing transfer cylinder I (2) and said first printing paper transfer cylinder II (3) are externally provided with a first The inspection device (7), the second printing paper transfer roller I (5) and the second printing paper transfer roller II (6) are externally provided with a second inspection device (8), the first inspection device (7) Both the second inspection device (8) are used to check the material or print quality of the substrate transferred from the front end.
A sheet-fed flexographic printing machine according to claim 1 or 2, characterized in that: said first impression cylinder (1), first printing transfer cylinder I (2), first printing pass The inside of the paper cylinder II (3), the second impression cylinder (4), the second printing paper roller I (5) and the second printing paper roller II (6) are mounted with a caries mechanism for holding the substrate .
A sheet-fed flexographic printing machine according to claim 1 or 2, wherein said first impression cylinder (1) and said second impression cylinder (4) have a liquid medium for flow therein. Temperature regulation control mechanism.
A sheet-fed flexographic printing machine according to claim 1 or 2, wherein said first impression cylinder (1) is provided with at least one first flexographic printing for mounting a flexo a roller (9), the first flexographic printing cylinder (9) is provided with a corresponding first ink supply system (10), and at least one of the second impression cylinders (4) is provided for mounting softness A second flexographic printing cylinder (11) of the plate, the second flexographic printing cylinder (11) being provided with a corresponding second ink supply system (12).
The sheet-fed flexographic printing machine according to claim 1 or 2, wherein the first impression cylinder (1) is externally disposed with a first printing ink drying and curing device (13), The second impression cylinder (4) is externally provided with a second printing ink drying and curing device (14).
A sheet-fed flexographic printing press according to claim 1 or 2, characterized in that the front end of the first printing unit is provided with an input paper feeding device (15).
A sheet-fed flexographic printing press according to claim 1 or 2, wherein said second printing unit has a multi-storage paper take-up device (16) disposed at the rear end thereof.