Gravure printing device and wood grain decorative paper printing process

Abstract

The present application relates to the technical field of intaglio printing, and particularly relates to an intaglio printing device and a wood grain decorative paper printing process, which comprises a machine body, a wood grain intaglio roller is rotatably installed on the machine body, a counterweight roller is slidably arranged on the machine body and above the wood grain intaglio roller, an ink box is arranged below the wood grain intaglio roller, a scraper is fixedly installed on the ink box, a displacement assembly is arranged on the ink box and below the scraper, and a material collecting assembly for cleaning the scraper is arranged on the displacement assembly. The ink condensate on the scraper is cleaned and collected by the reciprocating material collecting assembly, and the wear of the scraper is detected while the scraper is cleaned every time. When the wear of the scraper affects the cleaning of the blank surface of the wood grain intaglio roller, the system can detect the information in the first time, so that the scraper can be replaced in time, and the decorative paper in printing is prevented from being polluted by the uncleaned ink.

Description

Technical Field

[0001] This invention relates to the field of gravure printing technology, specifically to a gravure printing apparatus and a wood grain decorative paper printing process. Background Technology

[0002] A gravure printing press is a printing device that uses an intaglio plate as the printing plate. The image areas of the printing plate are recessed, while the blank areas are flush with the outer circumference of the printing cylinder. During the printing process, ink is filled into the recessed areas of the gravure plate. Excess ink is scraped off the plate surface by a doctor blade, leaving only the ink in the recesses. The ink is then transferred to the substrate to achieve the printing effect. Wood grain decorative paper is a decorative material with a wood grain pattern printed on its surface. When a gravure printing press is used to print wood grain decorative paper, the doctor blade needs to be in contact with the gravure cylinder for a long time to scrape off excess ink. If the doctor blade is exposed to air for a long time, the ink on it is prone to condensation, which will affect the cleaning effect of the doctor blade on the gravure cylinder and thus reduce the printing quality of the wood grain decorative paper. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a gravure printing apparatus and a wood grain decorative paper printing process, which can effectively solve the problem that the ink on the doctor blade is easily condensed when the doctor blade is exposed to the air for a long time, thus affecting the cleaning effect of the doctor blade on the gravure roller.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The present invention provides a gravure printing apparatus, including a machine body, on which a wood grain gravure roller is rotatably mounted, and a counterweight roller is slidably inserted on the machine body above the wood grain gravure roller. An ink box is disposed below the wood grain gravure roller, and a doctor blade is fixedly mounted on the ink box. A displacement component is disposed on the ink box below the doctor blade, and a material collection component for cleaning the doctor blade is disposed on the displacement component.

[0006] The material collection assembly includes a material collection trough, a sliding block is slidably installed in the material collection trough, a trapezoidal block is fixedly installed on the sliding block, a fixing groove is opened on the top of the trapezoidal block, a spring a is fixedly connected in the fixing groove, a detection block is fixedly installed at the end of the spring a, and an electrical sensitive element is fixedly installed in the fixing groove.

[0007] Furthermore, sliding grooves are provided on both sides of the material collection trough, and a spring b is fixedly installed in the sliding groove. A sliding rod is fixedly installed at the end of the spring b, and a limit plate is fixedly installed at the end of the sliding rod.

[0008] Furthermore, a telescopic rod is fixedly installed on one side of the limiting plate, a push plate is fixedly installed on the telescopic end of the telescopic rod, and a connecting rod is fixedly connected to one side of the push plate.

[0009] Furthermore, two sets of positioning grooves are symmetrically provided on the sliding block, and a spring c is fixedly installed in the positioning groove. A magnetic block is fixedly connected to the end of the spring c.

[0010] Furthermore, two sets of push rods are symmetrically fixedly installed on the body, and through holes are provided on the limiting plate.

[0011] Furthermore, a guide roller is provided on the machine body and on one side of the wood grain gravure roller. Support rods a are rotatably installed at both ends of the guide roller. A sliding groove is provided on the machine body, and the end of the support rod a is slidably inserted into the sliding groove. A support base is fixedly installed on the machine body, and a helical spring is fixedly installed on the support base. A connecting block is fixedly connected to the helical spring, and the connecting block is fixedly sleeved on the support rod a. An electrostatic adsorption roller is slidably installed on the machine body, and the electrostatic adsorption roller is located above the guide roller.

[0012] Furthermore, a dryer is provided on the machine body and on the other side of the wood grain gravure roller, a take-up roller is provided on one side of the dryer, and a pressure roller is slidably installed on the machine body, with the pressure roller located above the take-up roller.

[0013] A wood grain decorative paper printing process using a gravure printing apparatus includes:

[0014] S: Pass the end of the decorative paper through the space between the guide roller and the electrostatic adsorption roller, between the wood grain gravure roller and the counterweight roller, and through the dryer connection port. Then, pass it through the space between the take-up roller and the pressure roller and fix it to the take-up roller.

[0015] S: During the winding process of the decorative paper, the counterweight roller presses the decorative paper against the wood grain gravure roller, so that the concave wood grain pattern with ink on the wood grain gravure roller is imprinted on the decorative paper.

[0016] S: During the printing process, the doctor blade removes the ink from the surface of the wood grain gravure roller. The displacement component controls the material collection component to move along the bottom surface of the doctor blade. The material collection component cleans the ink condensate on the doctor blade and monitors the wear of the doctor blade in real time. Beneficial effects

[0017] The technical solution provided by this invention has the following advantages compared with known public technologies:

[0018] This invention uses a reciprocating material collection component to clean and collect ink condensates on the doctor blade. During each cleaning cycle, the system can also detect the wear of the doctor blade. When the wear of the doctor blade affects its ability to clean the blank surface of the wood grain gravure roller, the system can detect the information immediately, allowing for timely replacement of the doctor blade and preventing uncleaned ink from contaminating the decorative paper during printing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 For the present invention Figure 1 Enlarged structural diagram at point A in the middle;

[0022] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0023] Figure 4 This is a side view of the material collection trough of the present invention.

[0024] Figure 5 This is a schematic diagram of the material collection assembly of the present invention;

[0025] Figure 6 This is a cross-sectional structural diagram of the material collection assembly of the present invention;

[0026] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B;

[0027] Figure 8 This is a diagram showing the state of the ink condensate when the pusher plate of this invention is extruded.

[0028] Figure 9 This is a diagram showing the state of the ink condensate during the pouring process of this invention.

[0029] In the attached image:

[0030] 1. Body; 101. Slide groove;

[0031] 2. Guide roller; 201. Support rod a; 202. Support base; 203. Helical spring; 204. Connecting block; 205. Electrostatic adsorption roller;

[0032] 3. Wood grain gravure roller; 301. Counterweight roller; 302. Ink cartridge; 303. Doctor blade; 304. Displacement assembly; 305. Material collection assembly; 3051. Material collection trough; 3052. Sliding block; 3053. Trapezoidal block; 3054. Limiting plate; 3055. Telescopic rod; 3056. Push plate; 3057. Connecting rod; 3058. Sliding rod; 3059. Push rod; 306. Detection block; 307. Electrosensitive element; 308. Filter screen;

[0033] 4. Dryer;

[0034] 5. Take-up roller; 501. Pressure roller. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] The present invention will be further described below with reference to embodiments.

[0037] Example: Refer to Appendix Figure 1 —Appendix Figure 7 As shown, a gravure printing apparatus includes a machine body 1, on which a wood grain gravure roller 3 is rotatably mounted. The wood grain gravure roller 3 is provided with grooves for wood grain patterns to be printed. A counterweight roller 301 is slidably inserted on the machine body 1 and above the wood grain gravure roller 3. The counterweight roller 301 uses its own weight to press down on the decorative paper, pressing part of the decorative paper into the groove of the counterweight roller 301, thereby forming a wood grain pattern on the decorative paper.

[0038] Below the wood grain gravure roller 3 is an ink box 302, which is filled with printing ink. A doctor blade 303 is fixedly installed on the ink box 302. The doctor blade 303 scrapes away the ink from the blank areas on the surface of the wood grain gravure roller 3, excluding the grooves. A displacement component 304 is provided on the ink box 302 and below the doctor blade 303. A material collection component 305 for cleaning the doctor blade 303 is provided on the displacement component 304. The displacement component 304 drives the material collection component 305 to move back and forth along the edge of the doctor blade 303.

[0039] The collecting assembly 305 includes a collecting tank 3051, into which ink and its condensate scraped off from the doctor blade 303 are guided. (See attached drawing.) Figure 4 —Appendix Figure 5 , attached Figure 5To be close to the displacement component 304, a filter screen 308 is provided on the side of the collection tank 3051 that is close to the displacement component 304. Fine ink can pass through the filter screen 308 and fall back into the ink cartridge 302, while condensate will remain in the collection tank 3051.

[0040] A sliding block 3052 is slidably installed inside the collection trough 3051. A trapezoidal block 3053 is fixedly installed on the sliding block 3052. The sliding block 3052 supports the trapezoidal block 3053 to slide back and forth inside the collection trough 3051. The cross-section of the trapezoidal block 3053 is trapezoidal. The two inclined surfaces of the trapezoidal block 3053 will scrape off the condensate on the scraper 303 and guide the condensate into the collection trough 3051.

[0041] Due to long-term scraping of condensate, the surface of the doctor blade 303 will be worn and damaged, which will prevent it from completely adhering to the surface of the wood grain gravure roller 3 to completely scrape off the ink on the blank surface of the wood grain gravure roller 3. This will have a certain impact on the wood grain printing of decorative paper and reduce the quality of wood grain printing.

[0042] Specifically, a fixing groove is provided on the top of the trapezoidal block 3053, and a spring a is fixedly connected in the fixing groove. A detection block 306 is fixedly installed at the end of the spring a. When the detection block 306 is in close contact with the intact scraper 303, the detection block 306 and the trapezoidal block 3053 are kept on the same plane. An electrosensitive element 307 is fixedly installed in the fixing groove, and the detection block 306 and the electrosensitive element 307 are in close contact. When the scraper 303 is severely worn, the spring a pushes the detection block 306 out of the fixing groove according to the degree of wear. The detection block 306 moves, the connection between the detection block 306 and the electrosensitive element 307 is broken, and the electrosensitive element 307 sends a warning to the system that the scraper 303 needs to be repaired and replaced, so as to avoid the problem of poor printing quality of the roll of decorative paper due to the failure to detect the wear of the scraper 303 in time.

[0043] Furthermore, sliding grooves are provided on both sides of the material collection trough 3051. A spring b is fixedly installed in the sliding groove. The spring b is a tension spring. A sliding rod 3058 is fixedly installed at the end of the spring b. The sliding rod 3058 is telescopic. A limiting plate 3054 is fixedly installed at the end of the sliding rod 3058. The spring b tightly fits the limiting plate 3054 against the side of the material collection trough 3051 through the sliding rod 3058.

[0044] A telescopic rod 3055 is fixedly installed on one side of the limiting plate 3054. The telescopic rod 3055 is equipped with a tension spring to keep the telescopic end of the telescopic rod 3055 in a retracted state without external force. A push plate 3056 is fixedly installed on the telescopic end of the telescopic rod 3055. The push plate 3056 prevents the condensate from falling into the ink box 302 during the movement of the collection trough 3051, thereby preventing the condensate from adhering to the wood grain gravure roller 3 with the ink.

[0045] When the displacement component 304 moves the collecting component 305 to one end of the scraper 303, it can clean the condensate stored in the collecting trough 3051. (See also...) Figure 8 The limiting plate 3054 has a through hole. Two sets of push rods 3059 are symmetrically fixed on the machine body 1. The end of the push rod 3059 is a suction cup. When the material collection groove 3051 moves to the left and the displacement component 304 moves to the end, the push rod 3059 will be inserted into the material collection groove 3051 through the through hole, adsorbed on the side of the push plate 3056 on the left, and continuously push the push plate 3056 into the material collection groove 3051. The push plate 3056 and the sliding block 3052 together collect the condensate between them, squeeze the ink attached to it, and compress the collected condensate into a block.

[0046] Furthermore, two sets of positioning grooves are symmetrically formed on the sliding block 3052. A spring c is fixedly installed in the positioning groove, and a magnetic block is fixedly connected to the end of the spring c. When there is no external force pressing, the surface of the magnetic block is flush with the surface of the sliding block 3052, preventing ink and its condensed matter from entering the positioning groove. A connecting rod 3057 is fixedly connected to one side of the push plate 3056. A strong magnetic block is provided at the end of the connecting rod 3057. When the connecting rod 3057 is pushed towards the sliding block 3052, it will insert into the positioning groove, and the strong magnetic block will attract the magnetic block. During this process, the push plate 3056 pushes the ink and its condensed matter towards the sliding block 3052, and at the same time, the ink and its condensed matter will also push the sliding block 3052 to slide, so that the sliding block 3052 and the push plates 3056 on both sides together squeeze the condensed matter between them until... Figure 8 The connecting rods 3057 on both sides shown are inserted into the positioning grooves.

[0047] Furthermore, see the appendix. Figure 9 When the displacement component 304 controls the collection trough 3051 to move in the reverse direction, the position of the push plate 3056, which is attracted by the push rod 3059, relative to its push rod 3059 remains unchanged. Furthermore, due to the attraction between the strong magnetic blocks and the friction between the trapezoidal block 3053 and the scraper 303, the position of the sliding block 3052 relative to the push plate 3056 also remains unchanged. During the continuous movement of the collection trough 3051, the push plate 3056 eventually pushes the limiting plate 3054 to move and separate from the end of the collection trough 3051, at which point the spring b is stretched. In this state, the movement of the collection trough 3051 exposes the space between the sliding block 3052 and the push plate 3056, causing the condensate between them to fall from this gap, thus achieving the purpose of cleaning the condensate inside the collection trough 3051.

[0048] During the winding process of the decoction paper being wound up by the winding roller 5, the surface tension of the decoction paper will change due to the feeding and winding process, either becoming tight or loose. A guide roller 2 is provided on the machine body 1 and located on one side of the wood grain gravure roller 3. The guide roller 2 supports the newly fed decoction paper. Support rods a201 are rotatably installed at both ends of the guide roller 2. A groove 101 is provided on the machine body 1, and the end of the support rod a201 is slidably inserted into the groove 101. When the decoction paper is wound up, its tension increases, and the decoction paper will press down on the guide roller 2, reducing the tilt angle of the decoction paper from the guide roller 2 and the wood grain gravure roller 3, thereby reducing the surface tension of the decoction paper.

[0049] Conversely, when the surface tension of the decorative paper weakens, a support base 202 is fixedly installed on the machine body 1, a spiral spring 203 is fixedly installed on the support base 202, and a connecting block 204 is fixedly connected to the spiral spring 203. The connecting block 204 is fixedly sleeved on the support rod a201. The spiral spring 203 pushes the support rod a201 upward through the connecting block 204. The support rod a201 with the decorative paper adheres to the electrostatic adsorption roller 205. The electrostatic adsorption roller 205 is slidably installed on the machine body 1 and is located above the guide roller 2. The electrostatic adsorption roller 205 rotates with the movement of the decorative paper. The electrostatic adsorption roller 205 removes dust and debris from the surface of the decorative paper, preventing dust and debris from hindering the printing ink from adhering to the decorative paper.

[0050] Furthermore, a dryer 4 is provided on the machine body 1 and on the other side of the wood grain gravure roller 3. After the ink adheres to the decorative paper, the dryer 4 dries the area to prevent the ink on the decorative paper from being printed onto the already wound part of the decorative paper when it is wound up. A winding roller 5 is provided on one side of the dryer 4. The winding roller 5 winds up the decorative paper printed with wood grain. A pressure roller 501 is slidably installed on the machine body 1 and is located above the winding roller 5. The pressure roller 501 is always in close contact with the decorative paper to prevent the decorative paper from wrinkling during the winding process.

[0051] A wood grain decorative paper printing process using a gravure printing apparatus includes:

[0052] S1: Pass the end of the decorative paper through the guide roller 2 and the electrostatic adsorption roller 205, the wood grain gravure roller 3 and the counterweight roller 301 and the dryer 4 through the connection port, and then pass it through the take-up roller 5 and the pressure roller 501 and fix it to the take-up roller 5.

[0053] S2: During the winding process of the decorative paper, the counterweight roller 301 presses the decorative paper against the wood grain gravure roller 3, so that the concave wood grain pattern with ink on the wood grain gravure roller 3 is imprinted on the decorative paper.

[0054] S3: During the printing process, the doctor blade 303 removes the ink from the surface of the wood grain gravure roller 3, the displacement component 304 controls the material collection component 305 to move along the bottom surface of the doctor blade 303, the material collection component 305 cleans the ink condensate on the doctor blade 303, and at the same time monitors the wear degree of the doctor blade 303 in real time.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gravure printing apparatus, comprising a body (1), characterized in that: A wood grain gravure roller (3) is rotatably mounted on the machine body (1). A counterweight roller (301) is slidably inserted on the machine body (1) above the wood grain gravure roller (3). An ink box (302) is provided below the wood grain gravure roller (3). A scraper (303) is fixedly mounted on the ink box (302). A displacement component (304) is provided on the ink box (302) below the scraper (303). A material collection component (305) for cleaning the scraper (303) is provided on the displacement component (304). The material collection assembly (305) includes a material collection trough (3051), a sliding block (3052) is slidably installed in the material collection trough (3051), a trapezoidal block (3053) is fixedly installed on the sliding block (3052), a fixing groove is opened at the top of the trapezoidal block (3053), a spring a is fixedly connected in the fixing groove, a detection block (306) is fixedly installed at the end of the spring a, and an electrical sensitive element (307) is fixedly installed in the fixing groove. The material collection trough (3051) has sliding grooves on both sides. A spring b is fixedly installed in the sliding groove. A sliding rod (3058) is fixedly installed at the end of the spring b. A limit plate (3054) is fixedly installed at the end of the sliding rod (3058). A telescopic rod (3055) is fixedly installed on one side of the limiting plate (3054), and a push plate (3056) is fixedly installed on the telescopic end of the telescopic rod (3055). A connecting rod (3057) is fixedly connected to one side of the push plate (3056). Two sets of positioning grooves are symmetrically opened on the sliding block (3052). A spring c is fixedly installed in the positioning groove, and a magnetic block is fixedly connected to the end of the spring c. Two sets of push rods (3059) are symmetrically fixed on the body (1), and through holes are provided on the limiting plate (3054).

2. The gravure printing apparatus according to claim 1, characterized in that: A guide roller (2) is provided on the machine body (1) and on one side of the wood grain gravure roller (3). Support rods a (201) are rotatably installed at both ends of the guide roller (2). A groove (101) is provided on the machine body (1). The end of the support rod a (201) is slidably inserted into the groove (101). A support seat (202) is fixedly installed on the machine body (1). A helical spring (203) is fixedly installed on the support seat (202). A connecting block (204) is fixedly connected to the helical spring (203). The connecting block (204) is fixedly sleeved on the support rod a (201). An electrostatic adsorption roller (205) is slidably installed on the machine body (1) and is located above the guide roller (2).

3. The gravure printing apparatus according to claim 1, characterized in that: A dryer (4) is provided on the machine body (1) and on the other side of the wood grain gravure roller (3). A take-up roller (5) is provided on one side of the dryer (4). A pressure roller (501) is slidably installed on the machine body (1) and the pressure roller (501) is located above the take-up roller (5).

4. A wood grain decorative paper printing process for a gravure printing apparatus, which is applied to the gravure printing apparatus according to any one of claims 1-3, characterized in that, include: S1: Pass the end of the decorative paper through the guide roller (2) and the electrostatic adsorption roller (205), the wood grain gravure roller (3) and the counterweight roller (301) and the dryer (4) connection port, then pass it through the take-up roller (5) and the pressure roller (501) and fix it on the take-up roller (5); S2: During the winding process of the decorative paper, the counterweight roller (301) presses the decorative paper against the wood grain gravure roller (3), so that the concave wood grain pattern with ink on the wood grain gravure roller (3) is printed on the decorative paper. S3: During the printing process, the doctor blade (303) removes the ink from the surface of the wood grain gravure roller (3), the displacement component (304) controls the material collection component (305) to move along the bottom surface of the doctor blade (303), the material collection component (305) cleans the ink condensate on the doctor blade (303), and at the same time monitors the wear degree of the doctor blade (303) in real time.

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