A printing device and printing process for water-based ink decorative paper

Abstract

The present invention provides a printing device and a printing process for decorative paper with water-based ink, comprising a printing roller, a printing assembly and a drying assembly, wherein the drying assembly is used for drying base paper printed with ink, the printing assembly comprises a first printing part and a second printing part located at one side of the printing roller, and also comprises an oil scraper and an oil replenishing scraper part, the oil scraper part is located at one side of the printing roller, and the initial ink on the printing roller passes through the oil scraper part and the first printing part in sequence, the oil scraper part is used for scraping off part of the ink on the printing roller, the oil replenishing scraper part is located between the first printing part and the second printing part, the oil replenishing scraper part is used for smearing part of the ink onto the printing roller, and transmission parts for transmitting the base paper into and out of the drying assembly are provided between the first printing part and the drying assembly, as well as between the second printing part and the drying assembly; the advantage of the present invention is that two printings are integrated and completed by a group of printing rollers and drying devices, and the volume of the equipment is relatively reduced without reducing the efficiency and quality of printing.

Description

Technical Field

[0001] The invention relates to the field of decorative paper processing, and more particularly to a printing device and a printing process for water-based ink decorative paper. Background Art

[0002] Decorative paper is usually combined with furniture panels, wall panels, door panels, floors and other substrates to obtain decorative panels. Decorative paper makes the decorative panels beautiful and smooth, and has functions such as wear resistance, corrosion resistance, and waterproofness. It is widely used in public places, medical environments, kindergartens, schools, and home environments.

[0003] At present, the traditional water-based ink printing of decorative paper includes multiple processes, and the corresponding decorative paper printing equipment is assembly line type. Each printing requires a corresponding large printing cylinder group and drying device, that is, they are all independent, occupying a large factory area, which makes it difficult to meet the current new factory's demand for equipment integration. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a printing device and printing process for water-based ink decorative paper. The printing device integrates two printing operations and is completed by a set of printing rollers and drying devices, thereby relatively reducing the size of the equipment without reducing the efficiency and quality of printing.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A printing device for decorative paper with water-based ink comprises a printing roller, a printing assembly and a drying assembly, wherein the printing roller is used to print water-based ink on a base paper of the printing assembly, and the drying assembly is used to dry the base paper printed with ink. The printing assembly comprises a first printing member and a second printing member located on one side of the printing roller, and also comprises an oil scraper and an oil replenishing scraper member, wherein the oil scraper is located on one side of the printing roller, and the initial ink on the printing roller passes through the oil scraper and the first printing member in sequence, the oil scraper member is used to scrape off part of the ink on the printing roller, the oil replenishing scraper member is located between the first printing member and the second printing member, and the oil replenishing scraper member is used to apply part of the ink to the printing roller, and transmission members for transmitting the base paper in and out of the drying assembly are provided between the first printing member and the drying assembly and between the second printing member and the drying assembly.

[0007] Furthermore, the oil-replenishing scraper component includes an oil-replenishing head and a first scraper head, the oil-replenishing head is located on a side close to the first printing part, the first scraper head is located on a side close to the second printing part, an ink groove is provided at the bottom of the printing roller, the printing roller is partially immersed in the aqueous ink of the ink groove, an oil-replenishing pipe is provided between the oil-replenishing head and the ink groove, an ink gap is provided between the head end of the first scraper head and the printing roller, and a telescopic part for adjusting the ink gap is provided at the tail of the first scraper head.

[0008] Furthermore, the printing roller includes an inner cylinder and an outer cylinder, the outer cylinder is sleeved outside the inner cylinder, and an oil collecting chamber is provided between the inner cylinder and the outer cylinder, the outer surface of the outer cylinder is provided with a plurality of protruding printing textures, a plurality of oil ports are provided between two adjacent printing textures, and a plurality of funnel-shaped oil collecting hoppers are provided in the oil collecting chamber, the end of the oil collecting hopper with a larger diameter cooperates with the oil port, and an oil collecting gap is provided between the end of the oil collecting hopper with a smaller diameter and the inner cylinder.

[0009] Furthermore, the oil-replenishing scraper also includes an oil blowing head, which is located on the side of the oil-replenishing head facing the first printed part, and the blowing port of the oil blowing head faces the outer surface of the outer cylinder. The oil blowing head is used to provide a wind force to the outer surface of the outer cylinder to make the dust on the printed texture and the ink on the oil port flow into the oil collecting hopper.

[0010] Furthermore, the oil scraper includes a second scraper and an oil collecting hood, the oil collecting hood is located below the second scraper, an oil scraping gap is provided between the second scraper and the printing roller, the second scraper is provided with an adjusting member for adjusting the oil scraping gap, the oil collecting hood is used to collect ink dripping from the printing roller when the second scraper is scraping, an oil barrel is also provided on one side of the printing roller, an oil collecting pipe communicating with the oil barrel and the oil collecting hood is provided, and an oil supply pipe is provided between the oil barrel and the oil replenishing head.

[0011] Furthermore, the transmission component includes a first conveyor roller, a second conveyor roller, a third conveyor roller and a fourth conveyor roller. A first air-cooling component is provided above the first printed component, and an air outlet of the first air-cooling component faces the back side of the base paper transmitted by the first conveyor roller. A second air-cooling component is provided above the second printed component, and the second air-cooling component is located between the base paper transmitted by the second conveyor roller and the base paper transmitted by the third conveyor roller, and air outlets on both sides of the second air-cooling component face the corresponding back sides of the base paper respectively.

[0012] Furthermore, the drying component includes a first oven and a second oven, a heat exchange plate for heat exchange is provided between the first oven and the second oven, and a multi-layered transmission roller group is provided in the first oven and the second oven. Any group of transmission roller groups in the first oven is provided with a limiter for limiting the position of the bottom paper, and the group of transmission roller groups is slidably arranged with the first oven.

[0013] Furthermore, a plurality of visual cameras and a controller are provided above the printing cylinder, and the controller includes a collection module, a processing module and a control module;

[0014] The acquisition module obtains the image of the printed surface of the base paper after the first printing and drying taken by the visual camera as the image to be analyzed;

[0015] The processing module acquires the image to be analyzed in the acquisition module, and determines and obtains a reasonable value of the oil scraping gap according to the image to be analyzed;

[0016] The control module obtains the reasonable value in the processing module, and controls the telescopic member to adjust the ink gap according to the reasonable value.

[0017] Furthermore, the oil barrel includes a liquid level sensor, and the acquisition module obtains the amount of oil in the oil barrel detected by the liquid level sensor as the remaining oil information;

[0018] The processing module also includes a processing submodule, and the processing submodule also includes an oil replenishment preset value, obtains the remaining oil information in the acquisition module, calculates the oil inlet value of the oil receiving tank and the remaining oil value in the oil barrel according to the remaining oil information, and analyzes the remaining oil value, the oil inlet value and the oil replenishment preset value to obtain the oil supply instruction;

[0019] The control module obtains the oil supply instruction to control the opening or closing of the oil replenishment pipe.

[0020] A printing process for water-based ink decorative paper, further comprising the following steps:

[0021] Step S1, adjusting the scraping gap to a reasonable value, opening the first air cooling part to blow 70-80°C air to the back of the base paper after the first printing;

[0022] Step S2, adjusting the temperature in the first oven to between 90-145° C., conveying the bottom paper after passing through the first air-cooling unit to the first oven for drying, sliding the position of the conveying roller group to output the bottom paper to the outside of the first oven, and then opening the second air-cooling unit to blow air at 40-50° C. to the back of the bottom paper output to the outside of the first oven;

[0023] Step S3, opening the oil supply pipe alone or opening the oil supply pipe and the oil replenishing pipe at the same time, replenishing oil to the printing cylinder after the first printing, scraping off part of the excess ink using the first scraper head, conveying the base paper that has passed through the second air cooling part to the second printing part for printing, and then partially air-drying through the second air cooling part;

[0024] Step S4, adjusting the temperature in the second oven to between 120-165° C., conveying the base paper that has passed through the second air cooling member to the second oven for drying, and outputting the base paper to the outside of the second oven after drying.

[0025] The beneficial effects of the present invention are as follows: 1. By integrating multi-stage printing, one printing device is set up to complete two base paper printings, thus saving space. Specifically, an oil replenishing scraper member and an oil scraping member are set on the outer surface of the printing roller, which can partially scrape off the initial ink rolled up by the printing roller to complete the first printing of the first printed part, and oil is replenished by the oil replenishing head in the oil replenishing scraper member, and then the excess ink is scraped off by the first scraper head in the oil replenishing scraper member. An oil port is set on the surface of the printing roller, an oil collecting hopper is set inside, and negative pressure is set in the oil collecting chamber, which can effectively suck the ink scraped by the first scraper head into the oil collecting chamber from the oil port, thereby preventing the ink scraped by the first scraper head from flowing down to the second printed part, thereby ensuring the efficiency and quality of the second ink printing.

[0026] 2. A control and detection system is set up to ensure that the oil replenishment amount of the oil replenishing head can reach the preset oil replenishment value, so as to ensure that the second printed piece can efficiently complete the printing purpose. Specifically, the remaining oil amount, the oil inlet amount and the preset oil replenishment value in the oil barrel are detected by the liquid level sensor to analyze whether the oil in the oil barrel can complete the oil replenishment. If the oil barrel cannot complete the oil replenishment, it is necessary to open the oil replenishment pipe to extract some oil from the ink tank for replenishment. If the oil in the oil barrel can complete the oil replenishment, the oil replenishment amount of the oil replenishing head can be well controlled according to the oil inlet and outlet of the oil barrel to avoid excessive oil resulting in insufficient oil replenishment at the oil port. The oil scraped off by the first scraper head will flow down to the second printed piece, causing the base paper to be directly contaminated by the scraped ink. Therefore, the control system can accurately monitor the oil replenishment situation and improve printing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the overall structural diagram of the present invention;

[0028] Figure 2 is a partially simplified diagram of the present invention;

[0029] Figure 3 It is a structural diagram of the printing roller in the present invention;

[0030] Figure 4 is a cross-sectional view of a printing cylinder in the present invention;

[0031] Figure 5 It is a control relationship diagram in the present invention.

[0032] Subsidiary markings: 1. Printing cylinder; 111. Inner cylinder; 112. Outer cylinder; 113. Oil collecting chamber; 114. Oil port; 115. Oil collecting bucket; 116. Oil collecting gap; 2. Drying assembly; 21. First oven; 22. Second oven; 23. Transmission roller group; 24. Limiting member; 3. Bottom paper; 4. First printing member; 5. Second printing member; 6. Oil scraping member; 61. Second scraper; 62. Oil collecting cover; 63. Oil drum; 64 , oil supply pipe; 7, oil supply scraper component; 71, oil supply head; 72, first scraper head; 73, oil supply pipe; 74, telescopic component; 75, oil blowing head; 8, ink tank; 91, first conveying roller; 92, second conveying roller; 93, third conveying roller; 94, fourth conveying roller; 10, first air-cooling component; 11, second air-cooling component; 101, acquisition module; 102, processing module; 103, control module; 104, processing submodule. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The same parts are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0034] Since the conventional water-based ink printing of decorative paper includes multiple times, and the corresponding decorative paper printing equipment is of assembly line type, each printing needs to correspond to a large printing cylinder group and a drying device, that is, they are all in an independent state, occupying a large plant area, and it is difficult to meet the current new plant for equipment integration requirements; therefore, the present invention designs such a water-based ink decorative paper printing device, the specific structure is as follows Figure 1As shown, it includes a printing roller 1, a printing assembly and a drying assembly 2. The printing roller assembly is used to print water-based ink on the base paper 3 of the printing assembly. The drying assembly 2 is used to dry the base paper 3 printed with ink. The printing assembly includes a first printing member 4 and a second printing member 5 located on one side of the printing roller 1. The first printing member 4 and the second printing member 5 are both printing roller shafts installed on a frame. The first printing member 4 is located on the top of the printing roller 1, and the second printing member 5 is located on the right side of the printing roller 1. It also includes an oil scraper 6 and an oil replenishing scraper 7. The oil scraper 6 is located on one side of the printing roller 1, and the printing roller 1 is The initial ink passes through the scraper 6 and the first printing member 4 in sequence. The printing cylinder 1 rotates clockwise. When the printing cylinder 1 rotates, the ink in the ink groove 8 is rolled up on the surface, that is, the raised impression on the outer surface of the printing cylinder 1 is attached with ink. The scraper 6 is used to scrape off part of the ink on the printing cylinder 1 so that the ink on the impression reaches a specified thickness. The oil-replenishing scraper 7 is located between the first printing member 4 and the second printing member 5. The oil-replenishing scraper 7 is used to apply part of the ink to the printing cylinder 1. After the printing cylinder 1 rotates clockwise, the rolled-up ink is scraped off partly by the scraper 6, and the remaining part After the first printing piece 4 is printed, the print lacks ink, so the oil-replenishing scraper 7 needs to add a layer of ink of a specified thickness, that is, to realize the printing of the second printing piece 5. A transmission member for transmitting the bottom paper 3 in and out of the drying assembly 2 is provided between the first printing piece 4 and the drying assembly 2, and between the second printing piece 5 and the drying assembly 2. The printing principle is as follows: the bottom paper 3 enters the frame from one side and is transmitted to the first printing piece 4 by the transmission roller. The printing roller 1 rotates to print ink on the bottom paper 3 of the first printing piece 4. The bottom paper 3 with the first printing enters the drying assembly 2 under the transmission of the transmission member. The bottom paper 3 after the second printing piece 5 can be further dried in the drying component 2 under the action of the transmission component, and then the dried bottom paper 3 is transmitted out by the transmission component to be rolled and transported to the next step of dipping in glue. The present invention integrates multi-stage printing and sets one printing device to complete two printings of the bottom paper 3, thereby saving the space occupied by the equipment.

[0035] like Figure 1 and Figure 2As shown, the oil replenishing scraper member 7 includes an oil replenishing head 71 and a first scraper head 72. The oil replenishing head 71 is located on a side close to the first printing piece 4, and the first scraper head 72 is located on a side close to the second printing piece 5. An ink tank 8 is provided at the bottom of the printing roller 1, and the printing roller 1 is partially immersed in the water-based ink in the ink tank 8. An oil replenishing pipe 73 is provided between the oil replenishing head 71 and the ink tank 8. When the oil replenishing head 71 needs to be replenished with oil, the oil supply pump of the oil replenishing pipe 73 is turned on, and the oil supply pump can fill the ink in the ink tank 8 into the oil replenishing head 71 through the oil replenishing pipe 73. The oil replenishing head 71 can be a plurality of nozzles, each of which is evenly arranged side by side, and is sprayed on the printing roller 1 through the nozzles. The nozzle is a nozzle of an existing paint spray gun, and the spraying amount of the nozzle can be adjusted, and the oil replenishing head 71 can be adjusted to be aligned with the printing roller 1. The distance between the two ends can usually be adjusted by sliding the oil filling head 71 through a slide rail. Alternatively, the oil filling head 71 can be an oil brush, and the bristles of the oil brush are in contact with the outer surface of the printing cylinder 1. When the printing cylinder 1 rotates, the ink on the oil brush can be brushed onto the imprint. Similarly, the oil brush can be connected to the slide rail to adjust the distance between it and the printing cylinder 1. There is an ink gap between the head end of the first scraper head 72 and the printing cylinder 1. The tail of the first scraper head 72 is provided with a telescopic part 74 for adjusting the ink gap. The telescopic part 74 is a guide rail and a cylinder. The cylinder drives the first scraper head 72 to move on the guide rail to adjust the distance between the first scraper head 72 and the printing cylinder 1, that is, to adjust the size of the ink gap. The smaller the ink gap, the more ink is scraped off by the first scraper head 72.

[0036] Since the printing cylinder 1 rotates clockwise, if the ink scraped off by the first scraper head 72 cannot be collected or processed, the scraped ink will fall on the second printing member 5, affecting the second printing. Figure 3 and Figure 4 As shown, the printing cylinder 1 comprises an inner cylinder 111 and an outer cylinder 112, the outer cylinder 112 is sleeved outside the inner cylinder 111, and an oil collecting chamber 113 is provided between the inner cylinder 111 and the outer cylinder 112, the outer surface of the outer cylinder 112 is provided with a plurality of protruding printing textures (imprints), a plurality of oil ports 114 are provided between two adjacent printing textures, a plurality of funnel-shaped oil collecting buckets 115 are provided in the oil collecting chamber 113, a large-diameter end of the oil collecting bucket 115 cooperates with the oil port 114, and an oil collecting gap 113 is provided between a small-diameter end of the oil collecting bucket 115 and the inner cylinder 111 16. When the first scraper head 72 scrapes the ink on the imprint, the ink will be pushed into between two adjacent imprints. At this time, due to the negative pressure in the oil collecting chamber 113, the scraped ink is sucked from the oil port 114 into the oil collecting bucket 115. The oil collecting bucket 115 is funnel-shaped, with a lower opening on the outside and a larger opening on the inside. In a negative pressure scenario, the ink is more likely to enter the oil collecting bucket 115 to the oil collecting gap 116, and finally flow to the bottom of the printing roller 1. The negative pressure is achieved by setting air ducts at the center of the rotating shaft on both sides of the printing roller 1, and always sucking air outward to form negative pressure.

[0037] like Figure 1 As shown, the oil supply scraper 7 also includes an oil blowing head 75, which is located on the side of the oil supply head 71 facing the first printing member 4, and the blowing port of the oil blowing head 75 faces the outer surface of the outer cylinder 112. The oil blowing head 75 includes a plurality of air blowing nozzles arranged evenly and side by side, each of which is vertically facing the outer surface of the printing cylinder 1, and each of which is connected to the air cavity. The air in the air cavity is inflated so that the air blowing nozzle blows air toward the printing cylinder 1, and the oil blowing head 75 is used to provide a The wind force causes the dust on the printed texture and the ink on the oil port 114 to flow into the oil collecting bucket 115. As the printing roller 1 is scraped by the oil scraper 6, part of the ink will enter the oil port 114, but the ink will produce a layer of bubble film at the oil port 114, which can be broken by the air blowing nozzle, and the ink between two adjacent prints can also be completely blown into the oil port 114, so that the oil port 114 is in an open state, ensuring that the ink scraped by the subsequent first scraper head 72 can be sucked into the oil port 114 under negative pressure.

[0038] like Figure 2 As shown, the scraper 6 includes a second scraper 61, and an oil scraping gap is provided between the second scraper 61 and the printing cylinder 1. The second scraper 61 is provided with an adjusting member for adjusting the oil scraping gap (the adjusting member is a cylinder and a guide rail, and the cylinder drives the second scraper 61 to move on the guide rail so that the second scraper 61 is close to or away from the printing cylinder 1). In the traditional process, the ink scraped by the second scraper 61 drips into the oil tank. Since the dripping ink drips into the ink tank 8, a large number of bubbles will be generated, thereby affecting the rotation of the printing cylinder 1 and the adhered ink, an oil collecting cover is also provided. 62, the oil collecting hood 62 is located below the second scraper 61, and the oil collecting hood 62 is used to collect the ink dripping from the printing roller 1 when the second scraper 61 is scraping. An oil barrel 63 is also provided on one side of the printing roller 1, and a communicating oil collecting pipe is provided between the oil barrel 63 and the oil collecting hood 62, and an oil supply pipe 64 is provided between the oil barrel 63 and the oil replenishing head 71. Under normal circumstances, the oil replenishing head 71 is supplied with ink from the oil barrel 63 for a circulation. The oil collecting hood 62 is fixedly arranged with the second scraper 61, so when the second scraper 61 moves, the oil collecting hood 62 also moves therewith.

[0039] like Figure 1 and Figure 2As shown, the transmission member includes a first transmission roller 91, a second transmission roller 92, a third transmission roller 93 and a fourth transmission roller 94, wherein the first transmission roller 91 is a transmission roller for conveying the bottom paper 3 after the first printing and dyeing into the drying component 2, the second transmission roller 92 is a transmission roller for conveying the bottom paper 3 after the first drying out of the drying component 2, the third transmission roller 93 is a transmission roller for conveying the bottom paper 3 after the second printing and dyeing into the drying component 2, and the fourth transmission roller 94 is a transmission roller for conveying the bottom paper 3 after the second drying out of the drying component 2. A first air-cooling member 10 is provided above the first printing member 4. If it is blown directly to the printed and dyed front side of the bottom paper 3, it is easy to blow away the printed and dyed ink. Therefore, the air outlet of the first air-cooling member 10 faces the back side of the bottom paper 3 conveyed by the first transmission roller 91 for air drying, and the second printing A second air-cooling member 11 is provided above the brush member 5, and the second air-cooling member 11 is located between the base paper 3 transmitted by the second conveying roller 92 and the base paper 3 transmitted by the third conveying roller 93. The air outlets on both sides of the second air-cooling member 11 are respectively directed to the back sides of the corresponding base paper 3. When the base paper 3 after the first drying is output to the second printed member 5, since the temperature of the base paper 3 is still relatively high, the second air-cooling member 11 will blow out a cold wind to cool down the base paper 3, so that the second printing can be smoothly unaffected. When the second printing is completed and transmitted to the drying component 2, the second air-cooling member 11 will blow out cold wind to dry the back side of the base paper 3 printed for the second time. The wind blown out by the first air-cooling member 10 and the second air-cooling member 11 is located on the back side of the base paper 3, and the first air-cooling member 10 and the second air-cooling member 11 are both fans.

[0040] like Figure 2 As shown, the drying component 2 includes a first oven 21 and a second oven 22, a heat exchange plate for heat exchange is provided between the first oven 21 and the second oven 22, the temperature of the first oven 21 is between 90-145°C, and the temperature of the second oven 22 is between 120-165°C, and a multi-layered transmission roller group 23 is provided in the first oven 21 and the second oven 22. In order to realize the printing on the base paper 3 to present tree grain, the positions of the first printing and the second printing are different, that is, any group of transmission roller groups 23 in the first oven 21 is provided with a limiter 24 for limiting the position of the base paper 3, and the group of transmission roller groups 23 is slidably arranged with the first oven 21. When the driving unit drives the group of transmission roller groups 23 to slide, so that the position of the transmission roller group 23 is misaligned with the position of the previous group of sliding roller groups, the corresponding base paper 3 will be offset in position, and the grain of the second printing can be printed between the grains of the first printing.

[0041] Control part, such as Figure 5 As shown, a plurality of visual cameras and a controller are also provided above the printing cylinder 1, and the controller includes a collection module 101, a processing module 102 and a control module 103;

[0042] The acquisition module 101 obtains the image of the printed surface of the base paper 3 after the first printing and drying taken by the visual camera as the image to be analyzed. Since the scraping gap of the second scraper 61 is set, the image after the first printing is taken first;

[0043] The processing module 102 obtains the image to be analyzed in the acquisition module 101, and determines the reasonable value of the scraper gap according to the image to be analyzed; according to the image analysis after the first printing, whether the printed texture is too thick or too thin, if it does not reach the specified width, it needs to be adjusted until it is adjusted to the optimal state, and the corresponding distance value of the scraper gap is recorded as the reasonable value;

[0044] The control module 103 obtains the reasonable value in the processing module 102, and controls the telescopic member 74 to adjust the ink gap according to the reasonable value.

[0045] The oil barrel 63 includes a liquid level sensor, and the acquisition module 101 obtains the amount of oil in the oil barrel 63 detected by the liquid level sensor as the remaining oil information;

[0046] The processing module 102 also includes a processing submodule 104, and the processing submodule 104 also includes an oil replenishment preset value, which obtains the remaining oil information in the acquisition module 101, calculates the oil inlet value of the oil receiving tank and the remaining oil value in the oil barrel 63 according to the remaining oil information, and obtains the oil supply instruction according to the remaining oil value, the oil inlet value and the oil replenishment preset value. For example, at time a, the remaining oil amount in the oil barrel 63 is V1, the oil inlet value per second is V2, and the oil replenishment preset value per second is V3. V1+V2 is compared with V3. If it is assumed that V1+V2 is less than or equal to V3 after t seconds, an oil supply instruction to open the oil replenishment pipe 73 will be issued. If it is assumed that V1+V2 is greater than V3, an oil replenishment pipe 73 will be closed, and the normal oil supply pipe 64 can be opened.

[0047] The control module 103 obtains the oil supply instruction to control the opening or closing of the oil replenishing pipe 73; a control detection system is provided to ensure that the oil replenishing amount of the oil replenishing head 71 can reach the preset oil replenishing value, so as to ensure that the second printed part 5 can efficiently complete the printing purpose. Specifically, the remaining oil amount, the oil inlet amount and the preset oil replenishing value in the oil barrel 63 are detected by the liquid level sensor to analyze whether the oil in the oil barrel 63 can complete the oil replenishment. If the oil barrel 63 cannot complete the oil replenishment, it is necessary to open the oil replenishing pipe 73 to extract a part of the oil from the ink tank 8 for replenishment. If the oil in the oil barrel 63 can complete the oil replenishment, the oil replenishing amount of the oil replenishing head 71 can be well controlled according to the oil inlet and outlet of the oil barrel 63 to avoid excessive oil resulting in insufficient oil receiving amount at the oil port 114. The oil scraped off by the first scraper head 72 will flow down to the second printed part 5, causing the base paper 3 to be directly contaminated by the scraped ink. Therefore, the control system can accurately monitor the oil replenishment situation and improve the printing efficiency.

[0048] It also includes a feedback module. The acquisition module 101 can obtain the image of the printed surface of the base paper 3 after the second printing and drying taken by the visual camera as a comparison image. The feedback module obtains the comparison image and analyzes it. If the analysis shows that the texture on the base paper 3 does not meet the specified requirements, it is necessary to adjust the ink gap or adjust the oil replenishment amount of the oil replenishing head 71. There is a balance value between the oil replenishment amount and the ink gap. If the oil replenishment amount is too large and the ink gap is too small, the amount of oil scraped off is too large, and the amount of oil entering the oil port 114 is less than the amount of oil scraped off, then part of the ink will drip down onto the second printed part 5. Therefore, the feedback module also has the function of monitoring the balance value.

[0049] Since the traditional printing process is formed by corresponding printing equipment, the first step of the traditional printing process is to transport the base paper 3 to the printing roller shaft through the printing cylinder 1, and after the first printing is completed, it is transmitted to the drying device for the first drying, and after drying, it is transmitted to the second printing roller shaft through the second printing cylinder 1 to complete the second printing, and then enters the drying device for the second drying after printing, and then outputs and rolls up for the subsequent dipping process. However, this printing process easily causes the base paper 3 to affect the printing and dyeing of the ink due to the high temperature, and the printing cost is too high. Therefore, the present invention is equipped with this kind of printing process of water-based ink decorative paper, which also includes the following steps:

[0050] Step S1, adjusting the scraping gap to a reasonable value, opening the first air cooling part 10 to blow air at 70-80°C to the back of the bottom paper 3 after the first printing;

[0051] Step S2, adjusting the temperature in the first oven 21 to between 90°C and 145°C, conveying the bottom paper 3 after passing through the first air cooling unit 10 to the first oven 21 for drying, sliding the position of the conveying roller group 23 to output the bottom paper 3 to the outside of the first oven 21, and then opening the second air cooling unit 11 to blow air at 40°C to the back of the bottom paper 3 output to the outside of the first oven 21;

[0052] Step S3, opening the oil supply pipe 64 alone or opening the oil supply pipe 64 and the oil replenishing pipe 73 at the same time, replenishing oil to the printing cylinder 1 after the first printing, and then scraping off part of the excess ink using the first scraper head 72, conveying the base paper 3 passing through the second air-cooling part 11 to the second printing part 5 for printing, and then partially air-drying through the second air-cooling part 11;

[0053] Step S4, adjusting the temperature in the second oven 22 to between 120° C. and 165° C., conveying the base paper 3 after passing through the second air cooling unit 11 to the second oven 22 for drying, and outputting the base paper 3 to the outside of the second oven 22 after drying.

[0054] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A printing device for decorative paper with water-based ink, comprising a printing roller (1), a printing assembly and a drying assembly (2), wherein the printing roller (1) is used to print water-based ink on a base paper (3) of the printing assembly, and the drying assembly (2) is used to dry the base paper (3) printed with ink, characterized in that: The printing assembly comprises a first printing element (4) and a second printing element (5) located on one side of the printing roller (1), and also comprises an oil scraper (6) and an oil replenishing scraper (7), wherein the oil scraper (6) is located on one side of the printing roller (1), and the initial ink on the printing roller (1) passes through the oil scraper (6) and the first printing element (4) in sequence, and the oil scraper (6) is used to scrape off part of the ink on the printing roller (1), and the oil replenishing scraper (7) is located between the first printing element (4) and the second printing element (5), and the oil replenishing scraper (7) is used to apply part of the ink to the printing roller (1), and a transmission element for transmitting the base paper (3) into and out of the drying element (2) is provided between the first printing element (4) and the drying element (2) and between the second printing element (5) and the drying element (2); The oil replenishing scraper component (7) comprises an oil replenishing head (71) and a first scraper head (72), wherein the oil replenishing head (71) is located on a side close to the first printing component (4), and the first scraper head (72) is located on a side close to the second printing component (5); an ink groove (8) is provided at the bottom of the printing roller (1), and the printing roller (1) is partially immersed in the water-based ink in the ink groove (8); an oil replenishing pipe (73) is provided between the oil replenishing head (71) and the ink groove (8); an ink gap is provided between the head end of the first scraper head (72) and the printing roller (1); and a telescopic component (74) for adjusting the ink gap is provided at the tail end of the first scraper head (72); The printing cylinder (1) comprises an inner cylinder (111) and an outer cylinder (112); the outer cylinder (112) is sleeved outside the inner cylinder (111); an oil collecting chamber (113) is provided between the inner cylinder (111) and the outer cylinder (112); a plurality of protruding printing textures are provided on the outer surface of the outer cylinder (112); a plurality of oil ports (114) are provided between two adjacent printing textures; a plurality of funnel-shaped oil collecting buckets (115) are provided in the oil collecting chamber (113); a large-diameter end of the oil collecting bucket (115) cooperates with the oil port (114); and an oil collecting gap (116) is provided between a small-diameter end of the oil collecting bucket (115) and the inner cylinder (111).

2. The printing device for water-based ink decorative paper according to claim 1, characterized in that: The oil supply scraper (7) further comprises an oil blowing head (75), the oil blowing head (75) being located on a side of the oil supply head (71) facing the first printing piece (4), the blowing port of the oil blowing head (75) facing the outer surface of the outer cylinder (112), the oil blowing head (75) being used to provide a wind force to the outer surface of the outer cylinder (112) so that dust on the printed texture and ink on the oil port (114) flow into the oil collecting bucket (115).

3. The printing device for water-based ink decorative paper according to claim 2, characterized in that: The oil scraping member (6) comprises a second scraper (61) and an oil collecting hood (62). The oil collecting hood (62) is located below the second scraper (61). An oil scraping gap is provided between the second scraper (61) and the printing roller (1). An adjusting member for adjusting the oil scraping gap is provided on the second scraper (61). The oil collecting hood (62) is used to collect ink dripping from the printing roller (1) when the second scraper (61) scrapes. An oil barrel (63) is also provided on one side of the printing roller (1). An oil collecting pipe communicating with the oil barrel (63) and the oil collecting hood (62) is provided. An oil supply pipe (64) is provided between the oil barrel (63) and the oil supply head (71).

4. The printing device for water-based ink decorative paper according to claim 3, characterized in that: The transmission component comprises a first conveying roller (91), a second conveying roller (92), a third conveying roller (93) and a fourth conveying roller (94); a first air-cooling component (10) is arranged above the first printing component (4); an air outlet of the first air-cooling component (10) faces the back side of the base paper (3) transmitted by the first conveying roller (91); a second air-cooling component (11) is arranged above the second printing component (5); the second air-cooling component (11) is located between the base paper (3) transmitted by the second conveying roller (92) and the base paper (3) transmitted by the third conveying roller (93); and air outlets on both sides of the second air-cooling component (11) face the back side of the corresponding base paper (3) respectively.

5. The printing device for water-based ink decorative paper according to claim 4, characterized in that: The drying component (2) comprises a first oven (21) and a second oven (22); a heat exchange plate for heat exchange is provided between the first oven (21) and the second oven (22); a multi-layered transmission roller group (23) is provided in each of the first oven (21) and the second oven (22); a limiting member (24) for limiting the position of the bottom paper (3) is provided on any one of the transmission roller groups (23) in the first oven (21); the transmission roller group (23) and the first oven (21) are slidably arranged.

6. The printing device for water-based ink decorative paper according to claim 3, characterized in that: A plurality of visual cameras and a controller are also provided above the printing cylinder (1), wherein the controller comprises a collection module (101), a processing module (102) and a control module (103); The acquisition module (101) acquires the image of the printed surface of the base paper (3) after the first printing and drying, which is captured by the visual camera, as an image to be analyzed; The processing module (102) acquires the image to be analyzed in the acquisition module (101), and processes and determines a reasonable value of the oil scraping gap according to the image to be analyzed; The control module (103) obtains the reasonable value in the processing module (102), and controls the telescopic member (74) to adjust the ink gap according to the reasonable value.

7. The printing device for water-based ink decorative paper according to claim 6, characterized in that: The oil barrel (63) includes a liquid level sensor, and the acquisition module (101) obtains the amount of oil in the oil barrel (63) detected by the liquid level sensor as remaining oil information; The processing module (102) further includes a processing submodule (104), and the processing submodule (104) further includes an oil replenishment preset value, which obtains the remaining oil information in the acquisition module (101), calculates the oil inlet value of the oil receiving tank and the remaining oil value in the oil barrel (63) according to the remaining oil information, and obtains the oil supply instruction by analyzing the remaining oil value, the oil inlet value and the oil replenishment preset value; The control module (103) obtains the oil supply instruction to control the opening or closing of the oil replenishment pipe (73).

8. A printing process for decorative paper using water-based ink, characterized in that: The printing device according to claim 5 further comprises the following steps: Step S1, adjusting the scraping gap to a reasonable value, opening the first air cooling part (10) to blow air at 70-80°C to the back of the base paper (3) after the first printing; Step S2, adjusting the temperature in the first oven (21) to between 90°C and 145°C, conveying the bottom paper (3) that has passed through the first air-cooling unit (10) to the first oven (21) for drying, sliding the position of the conveying roller group (23) to output the bottom paper (3) to the outside of the first oven (21), and then opening the second air-cooling unit (11) to blow air at 40°C to the back of the bottom paper (3) that is output to the outside of the first oven (21); Step S3, opening the oil supply pipe (64) alone or opening the oil supply pipe (64) and the oil replenishing pipe (73) simultaneously, replenishing oil to the printing cylinder (1) after the first printing, scraping off part of the excess ink using the first scraper head (72), conveying the base paper (3) passing through the second air-cooling part (11) to the second printing part (5) for printing, and then partially air-drying through the second air-cooling part (11); Step S4, adjusting the temperature in the second oven (22) to between 120-165°C, conveying the base paper (3) that has passed through the second air cooling unit (11) to the second oven (22) for drying, and outputting it to the outside of the second oven (22) after drying.

Images