CN112829468A

CN112829468A - Composite printing machine

Info

Publication number: CN112829468A
Application number: CN202110169119.1A
Authority: CN
Inventors: 孙清涛; 王吉晖
Original assignee: Weifang Caihong Digital Technology Co ltd
Current assignee: Weifang Caihong Digital Technology Co ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2021-05-25

Abstract

The invention belongs to the technical field of printing, and particularly relates to a composite printing machine which comprises an unreeling unit, a substrate receiving unit, a unit printing mechanism, a digital printing mechanism, a unit gloss oil feeding mechanism and a reeling unit which are sequentially arranged, wherein the digital printing mechanism comprises a jet printing frame, a jet printing roller and a compression roller are rotatably arranged on the jet printing frame, and a jet printing assembly is arranged above the jet printing roller on the jet printing frame. According to the composite printing machine provided by the invention, the printing base material is firstly subjected to spot color printing through the unit printing mechanism, then is subjected to digital printing through the digital printing mechanism, the printing base material is wound around the jet printing roller for ink jet printing through the digital printing, the printing base material is good in conveying stability and high in printing precision, the advantages of the printing base material are complementary, the wide-width high-speed full-color printing of the printing base material is realized, the width of the base material can exceed 1 meter, and the conveying speed of the base material is high and exceeds 100 meters per minute.

Description

Composite printing machine

Technical Field

The invention belongs to the technical field of printing, and particularly relates to a composite printing machine.

Background

There are multiple printing modes in the printing packaging trade, including flexography, gravure, offset printing and digital printing etc, flexography, gravure, offset printing all belong to the unit formula printing, there is huge advantage in printing big color lump, aspect such as bottom color, have with low costs, high efficiency, there is not advantage such as poor, but have certain not enough in the printing of overprint, gradual change look, site, current digital printing technique is mostly plane scanning formula printing and small-size roll-to-roll printing, industry printing application effect is unsatisfactory, wherein small-size roll-to-roll printing is mainly applied to the printing trade, low speed and breadth are narrower.

At present, for printing of packages with large breadth and rich colors, unit type printing is mainly adopted, after a layout of one color is printed, other color layouts are printed after drying, a plurality of colors are printed for several times, the process is complicated, the equipment size is large, and the problems of low precision and low printing quality exist in overprinting, gradient color and dot printing.

Disclosure of Invention

The invention aims to provide a composite printing machine which combines the advantages of unit printing and digital printing and realizes high-speed full-color printing on a wide packaging base material.

In order to achieve the technical purpose, the technical scheme of the invention is as follows:

the composite printing machine comprises an unreeling unit, a substrate receiving unit, a unit printing mechanism, a digital printing mechanism, a unit gloss oil feeding mechanism and a reeling unit which are sequentially arranged, wherein the unit printing mechanism is provided with more than one.

As an improvement, the printing mechanism and the gloss oil mechanism of the unit both comprise an anilox roller, a printing roller, a bottom roller, a rubber roller and a doctor blade, the printing roller is connected with the inking mechanism, the rubber roller is abutted against the bottom roller, and the bottom roller is connected with a traction motor in a transmission manner.

As a further improvement, the digital printing mechanism comprises a jet printing frame, a jet printing roller is rotatably arranged on the jet printing frame, and a jet printing component is arranged on the jet printing frame and close to the jet printing roller.

As a further improvement, a drying device is arranged on the jet printing rack, and the jet printing roller is provided with a cooling structure.

As a further improvement, the spray printing roller comprises a roller body, one end of the roller body is connected with an in-out medium end cover, the other end of the roller body is connected with a reversing end cover, and a central shaft penetrates through the centers of the in-out medium end cover and the reversing end cover;

the cooling structure comprises a cooling channel arranged on the cylinder body, the extension direction of the cooling channel is parallel to the axial direction of the cylinder body, the cooling channel comprises a plurality of groups of medium inlet cooling channels and medium return cooling channels which are arranged at intervals, a medium inlet groove and a medium return groove are arranged on a medium inlet end cover, a reversing groove is arranged on a reversing end cover, the medium inlet groove is connected with the medium inlet cooling channels, the medium return groove is connected with the medium return cooling channels, the reversing groove is connected with the same group of medium inlet cooling channels and medium return cooling channels, a medium inlet channel and a medium outlet channel which are coaxially arranged are arranged on the central shaft, the medium inlet groove is connected with the medium inlet channel, and the medium return groove is connected with the medium outlet channel through a medium return pipe.

As a further improvement, the drying device comprises a first drying oven and a second drying oven, the second drying oven is arranged close to the printing substrate, the first drying oven comprises a shell, a cavity is arranged in the shell, an air inlet and an air outlet are arranged on the shell, one side edge of the shell close to the spray printing roller is arc-shaped, and one side of the shell close to the spray printing roller is provided with an air guide structure;

be equipped with the baffle in the cavity of casing, the baffle will the cavity divide into positive pressure chamber and negative pressure chamber, air intake connection positive pressure chamber, the negative pressure chamber is connected to the air outlet, air intake and air outlet pass through the fan and connect.

As a further improvement, wind-guiding structure includes that a plurality of settings are in the wind-guiding strip at the arc edge of casing, the wind-guiding strip is the rectangular of cross section for the V-arrangement, rectangular V word point is kept away from spout the seal cylinder setting, and is adjacent form the air-out clearance between the wind-guiding strip.

As a further improvement, spout the seal subassembly including spouting the seal support, spout the seal support and pass through the vertical slidable mounting of vertical lead screw module and be in the frame, spout the printing shower nozzle that is equipped with the arc arrangement in rows setting on the seal support, lie in the frame the below of printing the shower nozzle is equipped with the support of moisturizing, the support of moisturizing is installed through horizontal lead screw module in the frame, be equipped with on the support of moisturizing a plurality of with the sealed frame of moisturizing that the printing shower nozzle position corresponds, it is equipped with on the support of moisturizing to slide and scrapes the china ink pole, it is equipped with the doctor-bar on the china ink pole to scrape, the position of doctor-bar corresponds with the position of the printing shower nozzle of.

As a further improvement, the spray printing support is provided with a printing nozzle mounting strip, the printing nozzles are mounted on the printing nozzle mounting strip, each row of printing nozzles are mounted on two printing nozzle mounting strips arranged in parallel, and the positions of the printing nozzles on the two printing nozzle mounting strips correspond to each other.

As a further improvement, the printing nozzle is provided with an ink inlet and an ink outlet, the ink inlet is connected with a main ink box, the ink outlet is connected with a backflow ink box, and the main ink box and the backflow ink box are respectively connected with a negative pressure device.

Due to the adoption of the technical scheme, the invention has the beneficial effects that:

the composite printing machine provided by the invention comprises a unit printing mechanism, a digital printing mechanism and a unit gloss oil feeding mechanism, so that the advantages of unit printing and digital printing are complementary, a large color block is printed by the unit printing mechanism, overprinting, gradient color and dot printing are realized by the digital printing mechanism, the digital printing is realized by conveying a base material through a spray printing roller, the stability is good, the printing precision is high, the composite printing machine is well connected with the unit printing mechanism, the high-speed wide-width full-color printing of a reel base material is realized, the width of the base material reaches more than 1 meter, the speed exceeds 100 meters per minute, the process is simplified, the efficiency is improved, the cost is reduced, no color difference exists, the color gamut is wide, the overprinting is accurate, the gradient property.

In the application, the number of the unit printing mechanisms is set as required, and one or more units can be set.

The machine set printing mechanism is a traction and printing integrated machine, can be used for traction or printing independently, and can also realize two functions simultaneously, and the machine set printing mechanism in front of the ink jet printing mechanism and the oil polishing color group behind the ink jet printing mechanism are provided with power traction, so that the printing function is completed, and power is provided for the base material, and the base material of the ink jet printing unit stably runs under a constant tension state.

Drying device includes first oven and second oven, first oven is close to and spouts seal cylinder and sets up drying device, the second oven is close to and prints the substrate setting, the substrate after accomplishing the printing is dried, make the ink drying on it, concretely, first oven and second oven can the exclusive use, also can cooperate the use, because drying and equipment operation can make and spout seal cylinder and the printing substrate temperature rise on it, the temperature rise can arouse the change of printing substrate elongation, influence and print the quality, consequently, spout seal cylinder and set up cooling structure, cool down the cooling to spouting seal cylinder, cooperate with drying device, make and spout seal cylinder and the printing substrate on it keep the constant temperature, the index such as the elongation that makes the printing substrate is stable, guarantee the printing accuracy nature.

The position can be adjusted from top to bottom to spout the seal subassembly, when not printing, can scrape incomplete china ink and foul on the printing shower nozzle with the wiping piece, keeps printing the spraying clean, later sees to stretch into the sealed frame of moisturizing with printing the shower nozzle in, makes the printing shower nozzle not expose in the air, keeps printing the printing performance of shower nozzle.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of a configuration of a unit printing mechanism;

FIG. 3 is a perspective view of a digital printing mechanism;

FIG. 4 is a schematic view of a digital printing mechanism;

FIG. 5 is a schematic view of the construction of an inkjet printing cylinder;

FIGS. 6 and 7 are schematic structural views of an access media end cap;

FIG. 8 is a schematic structural view of a reversing end cap;

FIG. 9 is a schematic view of the construction of a reversing slot;

fig. 10 is a schematic structural view of the drying apparatus;

FIG. 11 is a schematic structural view of the drying device in cooperation with the inkjet printing roller;

FIG. 12 is a schematic structural view of an inkjet printing assembly;

fig. 13 is a schematic structural view of a moisturizing scaffold;

FIG. 14 is a schematic view of the ink supply structure;

in the attached drawings, 1-an unreeling unit, 2-a substrate receiving unit, 3-a unit printing mechanism, 31-an anilox roller, 32-a plate roller, 33-a bottom roller, 34-a rubber roller, 35-a doctor blade, 36-a plating mechanism, 4-a digital printing mechanism, 41-a spray printing frame, 42-a spray printing roller, 421-a barrel, 422-an in-and-out medium end cover, 423-a reversing end cover, 424-a central shaft, 425-a medium inlet cooling channel, 426-a medium return cooling channel, 427-a medium inlet groove, 428-a medium return groove, 429-a reversing groove, 4210-a medium inlet channel, 4211-a medium outlet channel, 4212-a rotary joint, 4213-a reinforcing sleeve, 4214-a reinforcing rib plate, 4215-a medium return pipe and 43-a press roller, 44-spray printing component, 441-spray printing bracket, 442-vertical screw module, 443-printing nozzle, 444-moisture-preserving bracket, 445-horizontal screw module, 446-moisture-preserving sealing frame, 447-ink scraping rod, 448-doctor blade, 449-printing nozzle mounting strip, 4410-main ink box, 4411-backflow ink box, 4412-main ink barrel, 4413-main negative pressure bottle, 4414-negative pressure pump, 4415-positive pressure pump, 4416-backflow pump, 4417-backflow negative pressure bottle, 4418-control board, 45-first oven, 451-shell, 452-air inlet, 453-air outlet, 454-partition board, 455-positive pressure cavity, 456-negative pressure cavity, 457-air guide strip, 46-second oven, 5-unit gloss oil mechanism, 6-rolling unit, 7-deviation rectifying mechanism.

Detailed Description

The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.

As shown in fig. 1 to 14, a composite printing machine includes an unwinding unit 1, a substrate receiving unit 2, a unit printing mechanism 3, a digital printing mechanism 4, a unit gloss oil applying mechanism 5, and a winding unit 6, which are sequentially disposed, and specifically, the unit printing mechanism is disposed at least one, and since each unit printing mechanism can only print one color, the number of the unit printing mechanisms can be set as required, and can be set as many as necessary. In the use process, the unreeling unit realizes the switching unreeling of left and right reels of a reel substrate, the automatic substrate receiving unit finishes the non-stop substrate receiving and reel changing, the unit printing mechanism, the digital printing mechanism and the unit varnish mechanism finish printing and varnish, so that the advantages of unit printing and digital printing are complementary, a large color block is printed by the unit printing mechanism firstly, overprinting, gradient color and dot printing are realized by the digital printing mechanism, the digital printing conveys the substrate by a spray printing roller, the stability is good, the printing precision is high, in specific use, a deviation correcting mechanism 7 can be arranged in front of the unit printing mechanism and behind the unit varnish mechanism, the front deviation correcting mechanism does not deviate in the running process of the substrate before printing each unit, the printing and overprinting precision is ensured, the rear deviation correcting mechanism ensures the reeling effect and quality before reeling, and finally, the non-stop reeling unit, the unreeling unit, The base material receiving unit, the rolling unit and the front and back deviation correcting mechanism can all adopt the structures which are used in the prior art.

In this embodiment, the printing mechanism and the gloss oil applying mechanism of the unit both include an anilox roller 31, a printing roller 32, a bottom roller 33, a rubber roller 34 and a doctor blade 35, the printing roller is connected with the gloss oil applying mechanism 36, the rubber roller abuts against the bottom roller, the bottom roller is connected with a traction motor in a transmission manner, the printing mechanism of the unit is a traction and printing integrated machine, and can be used for traction or printing independently or simultaneously, and the two functions can be realized simultaneously.

In this embodiment, the digital printing mechanism includes a jet printing frame 41, a jet printing roller 42 is rotatably disposed on the jet printing frame, the jet printing roller is used in cooperation with a pressing roller 43 in normal use, so as to improve the use effect, and a jet printing assembly 44 is disposed above the jet printing roller on the jet printing frame.

This embodiment is when digital printing, through spouting the seal cylinder and carry the substrate, stability is good, do not have swing and the jump from top to bottom about printing the substrate, in order to reach substrate transportation process's stability, improve the printing precision, well link up with unit printing mechanism, realize the full-color printing of high-speed broad width of reel substrate, the substrate width reaches more than 1 meter, speed exceeds 100 meters/minute, and the process has been simplified moreover, raise the efficiency, reduce cost, no colour difference, the colour gamut is wide, overprinting is accurate, the gradual change nature is good, realize high quality printing.

In actual use, the spray printing roller is connected with the auxiliary traction motor, the traction motor and the auxiliary traction motor run synchronously, the rubber roller tightly presses the base material on the bottom roller and the spray printing roller, the bottom roller and the spray printing roller rotate to provide traction power for the base material to pull the printed base material to move forward, the spray printing roller provides auxiliary traction power, the traction force requirement of the bottom roller is reduced, and stable transmission of the printed base material is realized. The unit printing mechanism of this embodiment is pull and printing all-in-one, compares with current special drive mechanism that sets up, simplifies equipment structure, and reduce cost practices thrift equipment occupation space, increases the bottom roll moreover, has both increased intensity and has increased peripheral space again.

In this embodiment, be equipped with drying device in the spout seal frame, dry the substrate after accomplishing the printing, make the ink drying on it, because drying and equipment operation can make the spout seal cylinder and the last printing substrate temperature rise, the temperature rise can arouse the change of printing substrate elongation, influence the printing quality, consequently, set up cooling structure at the spout seal cylinder, cool down the spout seal cylinder, with drying device cooperation, make the spout seal cylinder and the last printing substrate that prints keep the constant temperature, the index such as elongation that makes the printing substrate is stable, guarantee the printing accuracy nature.

In this embodiment, the inkjet printing roller 42 includes a cylinder 421, one end of the cylinder is connected to the medium inlet and outlet end cap 422, the other end is connected to the reversing end cap 423, and a central shaft 424 penetrates through the centers of the medium inlet and outlet end cap and the reversing end cap;

the cooling structure comprises a cooling channel arranged on the cylinder, the extension direction of the cooling channel is parallel to the axial direction of the cylinder, concretely, the cylinder is a seamless steel pipe, the cooling channel is a through hole arranged in the pipe wall of the cylinder, the cooling channel comprises a plurality of groups of medium inlet cooling channels 425 and medium return cooling channels 426 which are arranged at intervals, medium inlet and outlet end covers are provided with a medium inlet groove 427 and a medium return groove 428, the reversing end cover is provided with a reversing groove 429 which is connected with the medium inlet cooling channels, the medium return groove is connected with the medium return cooling channels, the reversing groove is connected with the same group of medium inlet cooling channels and medium return cooling channels, a central shaft is provided with a medium inlet channel 4210 and a medium outlet channel 4211 which are coaxially arranged, the medium inlet groove is connected with the medium inlet channel, the medium return groove is connected with the medium outlet channel through a medium return pipe 4215, the central shaft is provided with a through hole which is communicated with the medium inlet groove and the, the through hole corresponds to the position of the chamfer structure. In actual use, the central shaft is connected with the rotary joint 4212, the medium inlet of the rotary joint is connected with the medium inlet channel, and the medium outlet of the rotary joint is connected with the medium outlet channel.

Specifically, the medium inlet grooves extend along the radial direction of the medium inlet and outlet end covers, the positions, close to the peripheral surfaces of the end covers, of the medium inlet grooves extend in a turning mode and extend in parallel with the axial direction of the medium inlet and outlet end covers, the medium inlet grooves are arranged in a plurality of numbers and are uniformly distributed along the circumferential direction of the medium inlet and outlet end covers, the medium return grooves are located on the peripheral surfaces of the medium inlet and outlet end covers and extend along the circumferential direction of the medium inlet and outlet end covers, the groove walls of the medium return grooves are lower than those of the medium inlet grooves, correspondingly, the medium inlet ends of the medium inlet cooling channels are longer than the medium outlet ends of the medium return cooling channels, and therefore when the medium inlet and outlet end covers are connected with the cylinder body, the medium.

In this embodiment, the reinforcing ribs are disposed between the central shaft and the end caps, and include a reinforcing sleeve 4213 fixedly secured to the central shaft, and reinforcing ribs 4214 are connected to the periphery of the reinforcing sleeve, and radially distributed around the reinforcing sleeve to reinforce the structural strength of the entire drum.

In this embodiment, center pin and end cover adopt the connected mode of interference fit hot packing, avoid welding etc. to the damage of center pin, cause stress deformation, and end cover and barrel adopt the outside welding mode to be connected, and end cover and clamp plate also adopt the outside welding connected mode, guarantee enough joint strength, and is less to the intensity influence of end cover, clamp plate and barrel, and the welding seam can not contact coolant.

In practical use, the roller is a seamless steel pipe integrated type, an inner clamping sleeve and an outer clamping sleeve do not exist, the pipe wall is provided with uniformly distributed long holes serving as cooling medium channels, every two adjacent rollers are in a group and respectively serve as a medium inlet channel and a medium return channel, the cooling medium flows back from the medium inlet side to the reversing side, and temperature difference generated on two sides when the cooling medium flows into the other side from one side is avoided.

In the traditional jacket type, a spiral medium separation baffle is welded in a jacket along the circumference, and the length of a cooling channel is the product of the diameter of the circumference and the number of spiral turns, so the length of the cooling channel is too long. The invention, in order to circulate in the straight hole, the cycle period is one tenth of the original cycle period under the same flow velocity, thus greatly accelerating the circulation speed and leading the temperature control response to be faster and more accurate. In addition, the long hole structure is adopted in the embodiment, welding processing is not needed, and the structure is simple and difficult to rust.

When the cooling device is used, cooling medium flows into the medium inlet cooling channel from the medium inlet channel of the central shaft through the medium inlet groove of the end cover, then flows into the medium return cooling channel through the reversing end cover in a reversing mode, and finally flows into the medium outlet channel through the medium return pipe to finish the cooling process.

In this embodiment, the drying device includes a first oven 45 and a second oven 46, the second oven 46 is disposed near the printing substrate, the first oven 45 includes a housing 451, a cavity is disposed in the housing, an air inlet 452 and an air outlet 453 are disposed on the housing, an edge of one side of the housing near the spray printing roller is arc-shaped, and an air guide structure is disposed on one side of the housing near the spray printing roller;

a partition plate 454 is arranged in the cavity of the shell, the partition plate divides the cavity into a positive pressure cavity 455 and a negative pressure cavity 456, the air inlet is connected with the positive pressure cavity, the air outlet is connected with the negative pressure cavity, and the air inlet and the air outlet are connected through a fan.

Specifically, the structure of the second oven is not specifically limited, and an existing oven structure on the market may be adopted, and the first oven and the second oven may be used separately or in combination, and may be determined according to the use environment, the drying capability of the ink, the printing speed, and other factors.

When first oven in-service use, hot-blast air gets into the positive pressure chamber from the air intake and blows to the substrate through wind-guiding structure, under the pressure differential effect, gets into the negative pressure chamber, flows from the air outlet, through fan recycle, the energy saving, pressure differential effect wind-guiding makes hot-blast laminating substrate surface flow, is different from the direct-blow mode of traditional drying, improves drying efficiency.

In this embodiment, wind-guiding structure includes a plurality of wind-guiding strips 457 that set up at the arc edge of casing, and wind-guiding strip is the rectangular of cross section for the V-arrangement, and rectangular V word point is kept away from the setting of jet printing cylinder, forms the air-out clearance between the adjacent wind-guiding strip, makes hot-blast vertical blowing to the substrate uniformly, and wind-guiding strip still plays the effect of strengthening shell structure intensity.

During the concrete use, the casing passes through slide rail and cylinder slidable mounting and spouts the seal frame, is convenient for adjust the casing and spouts the distance between the base material on the seal cylinder, guarantees to dry the effect and avoids too closely and dry excessively from the base material again, is convenient for wear to draw the base material moreover and spouts the maintenance of seal cylinder, during operating condition, adjusts the casing and is close to and spouts the seal cylinder, during non-operating condition, makes the casing keep away from spouting the seal cylinder. In actual use, the direction of hot air flowing from the positive pressure cavity to the negative pressure cavity is opposite to the rotation direction of the jet printing roller, the relative speed of the hot air and the base material is increased, and the drying effect is improved.

In this embodiment, the inkjet printing assembly 44 includes an inkjet printing support 441, the inkjet printing support is vertically slidably mounted on the frame through a vertical lead screw module 442, the inkjet printing support is provided with printing nozzles 443 arranged in rows in an arc shape, the frame is provided with a moisturizing support 444 below the printing nozzles, the moisturizing support is mounted on the frame through a horizontal lead screw module 445, the moisturizing support is provided with a plurality of moisturizing sealing frames 446 corresponding to the positions of the printing nozzles, the top end of the moisturizing sealing frame is open, the other surfaces of the moisturizing sealing frames are closed, a certain amount of ink can be contained in the moisturizing support, the moisturizing support is slidably provided with an ink scraping rod 447, the ink scraping rod is provided with a scraping blade 448, the position of the scraping blade corresponds to the positions of the printing nozzles arranged in rows, the inkjet printing assembly can be adjusted in position from top to bottom, when the inkjet printing is not being printed, residual ink and dirt on the printing nozzles can be scraped by the scraping blade, the printing nozzles can be kept clean, the printing nozzle is not exposed in the air, and the printing performance of the printing nozzle is kept. In particular, the moisturizing support can be configured as a pool-like structure to store scraped residual ink and dirt, avoiding contamination of other components.

In this embodiment, be equipped with on the seal support and print shower nozzle mounting bar 449, it installs on printing the shower nozzle mounting bar to print the shower nozzle, every row of printing shower nozzle is installed on two print shower nozzle mounting bars that set up side by side, the position of the shower nozzle of printing on two print shower nozzle mounting bars is corresponding, adopt the mode of printing the shower nozzle double pin, make when one print the shower nozzle when stifled or damage, can print with another print shower nozzle of installing side by side, two probability that print the shower nozzle damage simultaneously of installing side by side in the in-service use is extremely low, greatly improve the stability of printing, be convenient for in time dismantle the maintenance with the print shower nozzle that breaks down.

In this embodiment, the inkjet printing assembly adopts a dual negative pressure circulation ink supply structure, the printing nozzle is provided with an ink inlet and an ink outlet, the ink inlet is connected with a main ink cartridge 4410, the ink outlet is connected with a return ink cartridge 4411, the main ink cartridge and the return ink cartridge are respectively connected with a negative pressure device, specifically, the ink inlet of the main ink cartridge is connected with a main ink barrel 4412 through a connecting pipeline, an ink supply pump, a filter and a degasser are arranged on the connecting pipeline, a vent of the main ink cartridge is connected with one inlet of a three-way valve, one outlet of the three-way valve is connected with a main negative pressure bottle 4413, the main negative pressure bottle is connected with a negative pressure pump 4414 through a valve, and the other; the ink outlet of the backflow ink box 4411 is connected with a backflow pump 4416, the backflow pump is connected with a main ink barrel 4412, the air vent of the backflow ink box is connected with a backflow negative pressure bottle 4417, the backflow negative pressure bottle is connected with a negative pressure pump 4414 through a valve, the air pressure of a negative pressure system is controlled by controlling the states of the pump and the valve through a control panel 4418, the main negative pressure bottle generates negative pressure for the main ink box, the backflow negative pressure bottle generates negative pressure for the backflow ink box, the main ink box adopts low negative pressure, the backflow ink box adopts high negative pressure to generate negative pressure difference, the ink is ensured to return to the backflow ink box from the main ink box through a printing nozzle, the ink of the backflow ink box returns to the main ink barrel, the main ink barrel returns to the main ink box through an ink supply pump, the normal circulation of the ink is realized by adopting a double negative pressure mode, meanwhile, the ink in the printing nozzle is ensured not to drip down, and, the stability of ink supply and ink is ensured.

This embodiment is in the specific use, print the substrate and carry out the spot color printing through unit printing mechanism earlier, then carry out digital printing through digital printing mechanism, unit printing mechanism and digital printing structure all are equipped with stoving structure, dry after every step of printing process, then enter into process on next step, the digital printing of this embodiment will print the substrate winding and spout the seal cylinder and carry out ink jet printing, and it keeps constant temperature to spout the seal cylinder, it carries stability good to print the substrate, the printing precision is high, with unit printing mechanism cooperation, the advantage is complementary, realize the high-speed full-color printing of broad width of printing substrate, the substrate width can exceed 1 meter, and substrate transport speed is fast, exceed 100 meters/minute.

The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The composite printing machine is characterized by comprising an unreeling unit, a substrate receiving unit, a unit printing mechanism, a digital printing mechanism, a unit gloss oil feeding mechanism and a reeling unit which are sequentially arranged, wherein the unit printing mechanism is provided with more than one.

2. The composite printing machine according to claim 1, wherein the unit printing mechanism and the unit varnishing mechanism each comprise an anilox roller, a plate roller, a bottom roller, a rubber roller and a doctor blade, the plate roller is connected with the plate feeding mechanism, the rubber roller abuts against the bottom roller, and the bottom roller is connected with a traction motor in a transmission manner.

3. The combination printing machine according to claim 1 or 2, wherein the digital printing mechanism comprises an inkjet printing frame, an inkjet printing cylinder is rotatably arranged on the inkjet printing frame, and an inkjet printing assembly is arranged on the inkjet printing frame and close to the inkjet printing cylinder.

4. The composite printing machine according to claim 3, wherein a drying device is provided on the inkjet printing frame, and the inkjet printing cylinder is provided with a cooling structure.

5. The composite printing machine according to claim 4, wherein the jet printing roller comprises a cylinder body, one end of the cylinder body is connected with an in-out medium end cover, the other end of the cylinder body is connected with a reversing end cover, and a central shaft penetrates through the centers of the in-out medium end cover and the reversing end cover;

6. The composite printing machine as claimed in claim 4, wherein the drying device comprises a first oven and a second oven, the second oven is arranged close to the printing substrate, the first oven comprises a housing, a cavity is arranged in the housing, an air inlet and an air outlet are arranged on the housing, one side edge of the housing close to the jet printing roller is arc-shaped, and one side of the housing close to the jet printing roller is provided with an air guide structure;

7. The composite printing machine as claimed in claim 6, wherein the air guide structure includes a plurality of air guide strips disposed on the arc-shaped edge of the casing, the air guide strips are long strips with V-shaped cross sections, the V-shaped tips of the long strips are disposed away from the jet printing cylinder, and air outlet gaps are formed between adjacent air guide strips.

8. The combination printing machine according to claim 2, wherein the inkjet printing assembly comprises an inkjet printing support, the inkjet printing support is vertically slidably mounted on the frame through a vertical lead screw module, the inkjet printing support is provided with printing nozzles arranged in rows in an arc shape, the frame is provided with a moisturizing support below the printing nozzles, the moisturizing support is mounted on the frame through a horizontal lead screw module, the moisturizing support is provided with a plurality of moisturizing sealing frames corresponding to the positions of the printing nozzles, the moisturizing support is provided with an ink scraping rod in a sliding manner, the ink scraping rod is provided with scraping blades, and the positions of the scraping blades correspond to the positions of the printing nozzles arranged in rows.

9. The combination printing machine according to claim 8, wherein a printing nozzle mounting bar is provided on the printing support, the printing nozzles are mounted on the printing nozzle mounting bar, each row of printing nozzles are mounted on two printing nozzle mounting bars arranged in parallel, and the positions of the printing nozzles on the two printing nozzle mounting bars correspond to each other.

10. The composite printer according to claim 8, wherein the print head is provided with an ink inlet and an ink outlet, the ink inlet is connected with a main ink cartridge, the ink outlet is connected with a return ink cartridge, and the main ink cartridge and the return ink cartridge are respectively connected with a negative pressure device.