Gravure printing machine capable of efficiently printing

Abstract

The invention relates to the technical field of gravure printing machines, in particular to an efficient printing gravure printing machine which comprises a rack and further comprises gravure assemblies and paste scraping assemblies, the gravure assemblies are arranged on the rack, the paste scraping assemblies are arranged on the gravure assemblies, the gravure assemblies are arranged in the cloth feeding direction, and the paste scraping assemblies are arranged on the gravure assemblies. The gravure components comprise a rotary screen, the scraping components penetrate through the rotary screen, the number of the scraping components is equal to that of the gravure components, each scraping component comprises an ink scraper, and the ink scrapers block sizing material particles on the surface of the rotary screen when the rotary screen rotates. Through the gravure assembly and the paste scraping assembly, the position of the paste scraping assembly can be adjusted when the rotary screen printing device is adapted to different rotary screen printing circles, so that rubber particles in printing ink are moved towards the end part in the axis direction of the rotary screen in the rotary screen rotating process; and the printing quality is ensured, and meanwhile, the influence on the printing efficiency caused by shutdown maintenance is avoided.

Description

Technical Field

[0001] This invention relates to the field of gravure printing machine technology, specifically to a gravure printing machine capable of high-efficiency printing. Background Technology

[0002] Textile fabric printing refers to the process of fixing dyes or pigments onto the surface of fibers in the form of patterns using different techniques on woven fabrics. It is an important part of textile finishing.

[0003] Traditional textile printing methods primarily employ digital inkjet printing, achieving plateless, high-simulation printing through a process of "digital file → micro-droplet jetting → chemical fixation." However, digital inkjet printing suffers from numerous problems, such as expensive printheads, high ink costs, slow speed, and high maintenance costs, severely limiting the quality and efficiency of textile printing. To address these issues, existing technologies offer relatively good solutions, such as gravure printing combined with rotary screen printing to replace digital inkjet printing. During printing, gravure rollers apply pressure to the fabric, causing it to adhere to the surface of the rotary screen. The pattern is printed onto the fabric as the gravure rollers and rotary screen rotate, effectively improving printing quality and efficiency. However, the following drawbacks remain: to ensure stable ink adhesion to the fabric, pre-coating and base adhesives need to be added to the ink. However, under prolonged working conditions, some of the adhesive dries and adheres to the rotary screen surface. When the squeegee is obstructed by this dried adhesive, it shifts, causing inconsistent squeegee force on the rotary screen, thus affecting printing quality and efficiency.

[0004] Therefore, in order to solve the above problems, a gravure printing machine capable of efficient printing is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a gravure printing machine capable of high-efficiency printing, solving the problem that under prolonged working conditions, some adhesive particles dry and adhere to the surface of the rotary screen, causing inconsistent squeegee force on the screen and affecting printing quality and efficiency. By configuring the gravure printing assembly and squeegee assembly, the position of the squeegee assembly can be adjusted to adapt to different rotary screen patterns. This allows the adhesive particles in the ink to move towards the end along the axis of the rotary screen during rotation, ensuring printing quality while avoiding the impact of downtime for maintenance on printing efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A high-efficiency gravure printing machine includes a frame, a gravure printing assembly, and a squeegee assembly. The gravure printing assembly is mounted on the frame, and the squeegee assembly is mounted on the gravure printing assembly. Multiple gravure printing assemblies are arranged along the fabric feeding direction. Each gravure printing assembly includes a rotary screen. The squeegee assemblies penetrate the rotary screen, and the number of squeegee assemblies is equal to the number of gravure printing assemblies. Each squeegee assembly includes a squeegee. When the rotary screen rotates, the squeegee blocks the adhesive particles on the surface of the rotary screen. When the adhesive particles are blocked by the squeegee, they move between the squeegee and the rotary screen and along the axial direction of the rotary screen.

[0008] Preferably, the gravure printing assembly further includes a mounting frame, a rotary screen holder, and an active chuck. The mounting frame is mounted on the machine frame, and two rotary screen holders are symmetrically arranged on the mounting frame. The included angle between the two rotary screen holders is set to... The circular mesh is mounted on two circular mesh brackets, and the active chuck is mounted on the circular mesh brackets. The two ends of the circular mesh are respectively engaged and mounted inside the corresponding active chucks.

[0009] Preferably, the doctor blade assembly further includes a doctor blade lifting device, which is mounted on a mounting frame and located at both ends of the doctor blade. The doctor blade includes an ink supply beam and an ink blade. Both ends of the ink supply beam are connected to the doctor blade lifting device. The ink blade is located at the bottom of the ink supply beam and its upper end is inclined towards the fabric feeding direction. The ink outlet of the ink supply beam is located at the bottom of the ink supply beam and is located on the side of the ink blade away from the fabric feeding direction.

[0010] Preferably, the ink knife includes blade one, blade two, and blade three, which are arranged sequentially along the fabric feeding direction, and the cutting edge of blade one is in contact with the surface of the circular screen.

[0011] Preferably, the cutting edges of both blade two and blade three are inclined, and the included angles between the cutting edges of both blade two and blade three and the surface of the circular mesh are both set to... .

[0012] Preferably, the cutting edges of blades two and three are inclined in opposite directions.

[0013] Preferably, both blade two and blade three have guide grooves on the side facing the ink outlet of the ink supply beam, and the length of the guide grooves is greater than the length of the circular screen.

[0014] Preferably, the width and depth of the guide grooves on the surfaces of blade two and blade three are proportional to the distance between their own cutting edges and the circular mesh.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. With the gravure printing component and squeegee component, effective squeegee operation can be performed when adapting to rotary screens of different diameters. Under long-term printing operation conditions, it can block the gradually drying and forming of the adhesive particles, and avoid the stickiness of the adhesive particles causing the position of the squeegee to shift, resulting in inconsistent squeegee force on the rotary screen. While ensuring printing quality, it also avoids the reduction in printing efficiency caused by downtime for maintenance.

[0017] 2. By dividing the ink knife into three blades, blade two and blade one arranged sequentially along the fabric feeding direction, the dried adhesive particles can be scraped off under the action of blade three and blade two, avoiding the accumulation of adhesive particles on the surface of blade one. This reduces the scraping resistance of blade one and also prevents the position of blade one from shifting, which would lead to inconsistent scraping force, thus ensuring printing quality and printing efficiency.

[0018] 3. By tilting the blades of blades two and three in opposite directions and providing guide grooves on the side of blades two and three away from the fabric feeding direction, the ink can smoothly contact the blade of blade one while the rotation of the rotary screen guides the adhesive particles in the ink to the outside of the rotary screen, further preventing the adhesive particles from affecting blade one and further ensuring printing quality and printing efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the connection structure between the gravure printing assembly and the scraping assembly of the present invention;

[0021] Figure 3 This is a schematic diagram of the connection structure between the circular screen and the scraper assembly of the present invention;

[0022] Figure 4 This is a schematic diagram of the connection structure between the circular screen, the ink supply beam, and the ink knife of the present invention.

[0023] Figure 5 For the present invention Figure 4 A magnified view of part A in the middle section;

[0024] Figure 6 For the present invention Figure 5 End view;

[0025] Figure 7 For the present invention Figure 6 Rear view.

[0026] In the diagram: 1. Frame; 2. Gravure printing assembly; 21. Rotary screen; 22. Mounting frame; 23. Rotary screen support; 24. Active chuck; 3. Doctor blade assembly; 31. Doctor blade; 311. Ink supply blade beam; 312. Ink blade; 3121. Blade 1; 3122. Blade 2; 3123. Blade 3; 3124. Guide groove; 32. Doctor blade lifting device; 4. Fabric. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1 to 7 This invention provides a gravure printing machine capable of high-efficiency printing, the technical solution of which is as follows:

[0029] For details, please refer to Figure 1 and Figure 2 A gravure printing machine capable of high-efficiency printing includes a frame 1, a gravure printing assembly 2, and a squeegee assembly 3. The gravure printing assembly 2 is mounted on the frame 1, and the squeegee assembly 3 is mounted on the gravure printing assembly 2. Multiple gravure printing assemblies 2 are arranged along the feeding direction of the fabric 4. Printing is performed through multiple gravure printing assemblies 2, using a superimposed process, which can print fabric 4 with various colors and patterns. The gravure printing assembly 2 includes a rotary screen 21, and the squeegee assembly 3 is arranged through the rotary screen 21. The number of squeegee assembly 3 is equal to that of the gravure printing assembly 2. A liftable gravure roller is arranged below the rotary screen 21. During the process of the rotary screen 21 and the gravure roller rotating in opposite directions at the same speed, the double-sided printing operation of the fabric 4 is performed. The gravure roller is prior art and therefore will not be described in detail in this application, nor is it shown in the accompanying drawings.

[0030] As one embodiment of the present invention, refer to Figure 1 , Figure 2 and Figure 3 The gravure printing assembly 2 also includes a mounting frame 22, a rotary screen holder 23, and an active chuck 24. The mounting frame 22 is mounted on the frame 1. Two rotary screen holders 23 are provided and symmetrically arranged on the mounting frame 22. The included angle between the two rotary screen holders 23 is set to... Each circular mesh bracket 23 is hinged to the mounting frame 22 via a pivot. The mounting frame 22 has an arc-shaped guide rail corresponding to the position of each circular mesh bracket 23. The base of each circular mesh bracket 23 has a slider that mates with the arc-shaped guide rail. A locking handle passes through the slider to lock the circular mesh bracket 23 at any position on the arc-shaped guide rail. By releasing the locking handle, the circular mesh bracket 23 can be manually pushed along the arc-shaped guide rail, thereby changing the included angle. Similarly, the active chuck 24 is mounted on a slide table that can be moved on the rotary screen bracket 23 via a screw and nut device. Its position can be precisely adjusted by rotating the screw. The angle adjustment of the two rotary screen brackets 23 and the installation position adjustment of the active chuck are existing technologies and are therefore not shown in the attached drawings. The rotary screen 21 is set on the two rotary screen brackets 23, and the active chuck 24 is set on the rotary screen brackets 23. The rotary screen brackets 23 can rotate on the active chuck 24 about their own axis, ensuring the smooth progress of the printing operation. The two ends of the rotary screen 21 are respectively clamped and set inside the corresponding active chuck 24.

[0031] Under the above-mentioned conditions, the active chuck 24 can clamp the two ends of the circular mesh 21, ensuring the stability of the circular mesh 21 during rotation. Furthermore, the position of the active chuck 24 on the circular mesh bracket 23 is adjustable, allowing for adjustment of the included angle. The angle allows the changed diameter circular mesh 21 to better fit. The angle satisfies the condition that the diameter of the circular mesh 21 is in the range of R = 640~1206 (where, =640, =726, =820, =914, =1018, =1206), in increasing The angle is suitable for larger diameter circular mesh 21, while reducing The angle is adapted to smaller diameter circular mesh 21, so that the 6 types of circular mesh 21 can be interchanged and used interchangeably, achieving the effect of changing the circular mesh pattern.

[0032] As one embodiment of the present invention, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The scraper assembly 3 includes a scraper 31. When the rotary screen 21 rotates, the scraper 31 blocks the adhesive particles on the surface of the rotary screen 21. When the adhesive particles are blocked by the scraper 31, they move between the scraper 31 and the rotary screen 21 and along the axial direction of the rotary screen 21. The scraper assembly 3 also includes a scraper lifting device 32, which is mounted on the mounting frame 22 and located at both ends of the scraper 31. To ensure that the two ends of the scraper 31 rise and fall synchronously, the scraper lifting device contains multiple cylinders respectively mounted at both ends of the mounting frame 22. The multiple cylinders work synchronously to achieve precise mechanical synchronization and are used to adjust the height position of the scraper 31 to adapt to rotary screens 21 of different diameters. The scraper 31 includes an ink supply blade. The beam 311 and the ink knife 312 are connected at both ends to the doctor blade lifting device 32. The ink knife 312 is located at the bottom of the ink knife beam 311 and the upper end is inclined towards the feeding direction of the fabric 4. The ink outlet of the ink knife beam 311 is located at the bottom of the ink knife beam 311 and is located on the side of the ink knife 312 away from the feeding direction of the fabric 4. The ink knife 312 includes a first blade 3121, a second blade 3122 and a third blade 3123. The third blade 3123, the second blade 3122 and the first blade 3121 are arranged in sequence along the feeding direction of the fabric 4. The cutting edge of the first blade 3121 is in contact with the surface of the circular screen 21. The rigidity of the second blade 3122 and the third blade 3123 is greater than that of the first blade 3121.

[0033] Under the above-mentioned conditions, during the rotation of the rotary screen 21, the ink flows out through the ink outlet at the bottom of the ink supply beam 311 to the surface of the third blade 3123. Under its own gravity, it flows down along the surface of the third blade 3123 to the inner wall of the rotary screen 21. Since the rotary screen 21 is constantly rotating, the ink flowing to the inner wall of the rotary screen 21 will rotate with the rotary screen 21. When the ink rotates to the position of the first blade 3121, the first blade 3121 will scrape off the excess ink to ensure the printing effect. Under long-term working conditions, the dried and formed adhesive particles will be blocked and scraped off by the first blade 3121 and the second blade 3122, avoiding the accumulation of adhesive particles that may cause the position of the first blade 3121 to shift. This effectively avoids inconsistent scraping force on the rotary screen 21, ensuring printing quality while also avoiding the problem of low printing efficiency caused by downtime for maintenance.

[0034] As one embodiment of the present invention, refer to Figure 6 and Figure 7 Both blades 3122 and 3123 have their cutting edges angled, with opposite directions of inclination. The angles between the cutting edges of both blades 3122 and 3123 and the surface of the circular mesh 21 are both set to... .

[0035] Under the above-mentioned settings, The angle of the blades 3122 and 3123 is such that the distance between the blade edges and the rotary screen 21 is 0.2–30 micrometers. Furthermore, the distance between the blade edges and the rotary screen 21 increases arithmetically along the axial direction of the rotary screen 21, preventing both missed areas and damage to the rotary screen 21. Simultaneously, the inclined blades 3122 and 3123 effectively remove adhesive particles generated during long-term printing operations. Because the blade edges of blades 3122 and 3123 are inclined in opposite directions, the adhesive particles removed by blade 3123 can be scraped along the blade... The gap between blade 3123 and the inner wall of rotary screen 21 moves towards one end of rotary screen 21. After passing the gap between the blade 3123 and rotary screen 21, the scraped adhesive particles are scraped off by blade 22 and move towards the other end of rotary screen 21 along the gap between the blade 22 and rotary screen 21 (the greater the distance between the blade and the rotary screen, the faster the ink flow rate at that point. According to Bernoulli's principle, the faster the flow rate, the lower the pressure, which will cause the ink to gradually move towards that point). This prevents the scraped adhesive particles from clogging and causing deformation of blade 3121, resulting in inconsistent scraping force, and further ensures the printing quality and efficiency.

[0036] As one embodiment of the present invention, refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 Both blade 2 3122 and blade 3 3123 have guide grooves 3124 on the side facing the ink outlet of the ink supply beam 311. The length of the guide groove 3124 is greater than the length of the circular screen 21. The width and depth of the guide groove 3124 on the surface of blade 2 3122 and blade 3 3123 are proportional to the distance between their own blade edge and the circular screen 21.

[0037] Under the above settings, since the upper ends of blade 1 3121, blade 2 3122 and blade 3 3123 are all inclined towards the direction of fabric 4 feeding, and as the rotary screen 21 continues to rotate, the adhesive particles scraped off by blade 2 3122 and blade 3 3123, as well as some ink, will enter the interior of the corresponding guide groove 3124 under their own intermolecular forces. As the amount of ink inside the guide groove 3124 increases, the adhesive particles will move along the guide groove 3124 and eventually be discharged to the outside of the guide groove 3124, thereby avoiding the accumulation of adhesive particles on the surface of the rotary screen 21 and blade 2 3122 and blade 3 3123, further ensuring the printing quality and efficiency.

[0038] Working principle:

[0039] Before use, first adjust the included angle between the two circular screen brackets 23, set the circular screen 21 to be used on the two circular screen brackets 23, and fix the two ends of the circular screen 21 by the active chuck 24 to ensure the stability of the circular screen 21 during operation; then adjust the height of the ink supply blade beam 311 by the doctor blade lifting device 32 so that the distance between the blade 3121 and the circular screen 21 is within a suitable working range;

[0040] When feeding the fabric 4, ink is supplied through the ink supply beam 311. The ink flows out from the ink outlet at the bottom of the ink supply beam 311 to the bottom inner wall of the rotary screen 21. Some ink adheres to the side of the blade 3123 away from the feeding direction of the fabric 4. As the rotary screen 21 rotates, the blade 3121 scrapes off the excess ink to avoid excessive ink and smudging.

[0041] As the printing process continues, some of the adhesive in the ink gradually dries and forms particles that aggregate together. At this point, the blades 3123 and 3122 can scrape off the formed adhesive particles. When the adhesive particles are blocked by the blade 3123, some of the adhesive particles will move towards the end where the distance between the blade 3123 and the inner wall of the rotary screen 21 increases in an arithmetic progression. Other adhesive particles will aggregate on the surface of the blade 3123 due to the intermolecular forces of the ink and the tilt angle of the blade 3123. As the amount of aggregate increases, the adhesive particles will enter the interior of the guide groove 3124. The ink and adhesive particles inside the guide groove 3124 will move towards one end of the blade 3123 due to the depth of the guide groove 3124 and their own gravity, thereby discharging the adhesive particles from the guide groove 3124.

[0042] Similarly, ink and adhesive particles that pass through blade 3123 will be blocked by blade 2 3122. Under the action of the cutting edge of blade 2 3122 and the guide groove 3124 on the surface of blade 2 3122, the adhesive particles are discharged to the opposite end of blade 3123. This avoids the formed adhesive particles causing uneven scraping force of blade 1 3121, ensuring printing quality and improving printing efficiency.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gravure printing machine capable of high-efficiency printing, comprising a frame (1), characterized in that: It also includes a gravure printing assembly (2) and a squeegee assembly (3). The gravure printing assembly (2) is mounted on the frame (1), and the squeegee assembly (3) is mounted on the gravure printing assembly (2). Multiple gravure printing assemblies (2) are arranged along the fabric (4) feeding direction. The gravure printing assembly (2) includes a rotary screen (21). The squeegee assembly (3) is arranged through the rotary screen (21). The number of squeegee assemblies (3) is equal to that of the gravure printing assembly (2). The squeegee assembly (3) includes a squeegee (31). When the rotary screen (21) rotates, the squeegee (31) blocks the adhesive particles on the surface of the rotary screen (21). When the adhesive particles are blocked by the squeegee (31), they move between the squeegee (31) and the rotary screen (21) and along the axial direction of the rotary screen (21).

2. The gravure printing machine capable of high-efficiency printing according to claim 1, characterized in that: The gravure printing assembly (2) further includes a mounting frame (22), a rotary screen holder (23), and an active chuck (24). The mounting frame (22) is mounted on the frame (1). Two rotary screen holders (23) are symmetrically arranged on the mounting frame (22), and the included angle between the two rotary screen holders (23) is set to... The circular mesh (21) is set on two circular mesh brackets (23), and the active chuck (24) is set on the circular mesh brackets (23). The two ends of the circular mesh (21) are respectively clamped and set inside the corresponding active chuck (24).

3. The gravure printing machine capable of high-efficiency printing according to claim 2, characterized in that: The scraper assembly (3) also includes a scraper lifting device (32), which is mounted on the mounting frame (22) and located at both ends of the scraper (31). The scraper (31) includes an ink supply beam (311) and an ink blade (312). Both ends of the ink supply beam (311) are connected to the scraper lifting device (32). The ink blade (312) is located at the bottom of the ink supply beam (311) and its upper end is inclined towards the feeding direction of the fabric (4). The ink outlet of the ink supply beam (311) is located at the bottom of the ink supply beam (311) and is located on the side of the ink blade (312) away from the feeding direction of the fabric (4).

4. The gravure printing machine capable of high-efficiency printing according to claim 3, characterized in that: The ink knife (312) includes blade one (3121), blade two (3122) and blade three (3123). Blade three (3123), blade two (3122) and blade one (3121) are arranged sequentially along the feeding direction of the fabric (4). The blade of blade one (3121) is in contact with the surface of the circular screen (21).

5. The gravure printing machine capable of high-efficiency printing according to claim 4, characterized in that: The blades of blade two (3122) and blade three (3123) are both inclined, and the angles between the blades of blade two (3122) and blade three (3123) and the surface of the circular mesh (21) are both set to... .

6. The gravure printing machine capable of high-efficiency printing according to claim 5, characterized in that: The blades 2 (3122) and 3 (3123) have opposite blade inclination directions.

7. The gravure printing machine capable of high-efficiency printing according to claim 4, characterized in that: Both blade 2 (3122) and blade 3 (3123) have guide grooves (3124) on the side facing the ink outlet of the ink supply beam (311), and the length of the guide grooves (3124) is greater than the length of the circular screen (21).

8. The gravure printing machine capable of high-efficiency printing according to claim 4, characterized in that: The width and depth of the guide groove (3124) on the surface of the second blade (3122) and the third blade (3123) are proportional to the distance between their own cutting edge and the circular mesh (21).

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