Ink circulation flow control method for printing mechanism

Abstract

The present application relates to the technical field of packaging film printing, and particularly relates to an ink circulating flow control method of a printing mechanism; an ink concentration adjusting container is arranged, ink in an ink fountain is combined with hot water to be adjusted into a suitable printing concentration, and then is pumped into an ink tray; through rotation of an ink roller, ink is attached to a surface of the ink roller; through a process in which a transfer roller and the ink roller clamp and feed a packaging film, the packaging film surface is printed with ink; since hot water and ink are used for dilution and adjustment, on one hand, mixing and uniformity of the ink and the hot water are accelerated, and on the other hand, drying speed of the ink on the packaging film is accelerated, time for subsequent drying is reduced, production efficiency is improved; through the ink concentration adjustment and circulation system and the control method, the ink in the ink tray can always maintain a suitable ink concentration; even if a large amount of water in high-temperature ink on the ink tray volatilizes, the ink concentration on the ink tray can always be controlled in a suitable range, and printing depth of the packaging film of the same batch is uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging film printing, in particular to an ink circulation flow control method of a printing mechanism. BACKGROUND

[0002] The printing mechanism of the current packaging film includes an ink roller, a transfer roller and an upper film roller. Referring to the patent document with the publication number CN105729993A, the lower part of the ink roller is immersed in an ink box, so that the surface of the ink roller is coated with ink. The upper part of the ink roller cooperates with the transfer roller to clamp the packaging film, so that the ink roller and the transfer roller synchronously rotate to drive the packaging film to forward convey. During the conveying process, the ink on the surface of the ink roller is used to print the passing packaging film.

[0003] In the above patent solution, the ink replenishment and concentration adjustment mechanism of the ink box is not described. The upper part of the existing ink box is in an open state. After a long time of use, on the one hand, the ink in the ink box will be consumed, and on the other hand, due to the volatilization of the ink, the concentration of the ink in the ink box will continuously increase. If the same concentration of ink is directly replenished into the ink box, it will cause the printing depth of the same batch of packaging film to be different, affecting the printing quality. On the other hand, in order to avoid the rapid volatilization of the water in the ink, the ink in the existing ink box is generally controlled at a relatively low temperature, which will cause the drying speed of the ink on the packaging film to be slow, increasing the subsequent drying time, thereby reducing the production efficiency. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an ink circulation flow control method of a printing mechanism, which can ensure that the printing depth of the same batch of packaging film is uniform, and can improve the drying efficiency of the ink on the packaging film.

[0005] In order to solve the above technical problems, the technical scheme adopted by the present application is:

[0006] The ink circulation flow control method of the printing mechanism is based on an ink circulation system, and the ink circulation system comprises:

[0007] a rack;

[0008] an ink tray connected to the rack;

[0009] an ink roller rotatably connected to the rack, the lower part of the ink roller being immersed in the ink tray;

[0010] a transfer roller rotatably connected to the rack, the transfer roller being located above the ink roller, and the transfer roller being used to clamp and feed the packaging film in cooperation with the ink roller;

[0011] An ink concentration adjusting container is connected to the ink tray through a first pipeline, and a concentration detector is arranged in the ink concentration adjusting container;

[0012] A first liquid pump is connected to the first pipeline to pump the ink in the ink concentration adjusting container into the ink tray;

[0013] A first electromagnetic valve is connected to the first pipeline;

[0014] A hot water pipeline has its end connected to the ink concentration adjusting container;

[0015] A second liquid pump is connected to the hot water pipeline to pump the hot water into the ink concentration adjusting container;

[0016] A second electromagnetic valve is connected to the second pipeline;

[0017] An ink fountain is connected to the frame;

[0018] The second pipeline comprises a main pipeline, a first branch pipeline and a second branch pipeline, the beginning of the main pipeline is connected to the ink fountain, the end of the main pipeline is connected to the beginning of the first branch pipeline and the beginning of the second branch pipeline through a three-way valve, the end of the first branch pipeline is connected to the ink concentration adjusting container, and the end of the second branch pipeline is connected to the ink fountain;

[0019] A third liquid pump is connected to the main pipeline;

[0020] A third pipeline is arranged on one side of the ink tray and has its beginning connected to an overflow port and its end connected to the ink fountain;

[0021] A controller is electrically connected to the first liquid pump, the second liquid pump, the third liquid pump, the first electromagnetic valve, the second electromagnetic valve, the three-way valve and the concentration detector respectively;

[0022] The ink circulation flow control method comprises the following steps:

[0023] Step 1: control the first liquid pump and the first electromagnetic valve to be closed, control the second liquid pump, the second electromagnetic valve and the third liquid pump to be opened, and control the three-way valve to increase the opening degree of the passage to the first branch pipeline, so that the hot water and the ink in the ink fountain are mixed in the ink concentration adjusting container;

[0024] Step 2: adjust the opening degrees of the second electromagnetic valve and the three-way valve according to the concentration detected by the concentration detector until the concentration detected by the concentration detector reaches a preset value, and control the first liquid pump and the first electromagnetic valve to be opened, so that the ink in the ink concentration adjusting container is pumped into the ink tray;

[0025] Step 3: The control concentration detector continuously detects the ink concentration in the ink concentration adjusting container, and adjusts the opening degree of the second electromagnetic valve and the three-way valve according to the detection value, so as to keep the ink concentration in the ink concentration adjusting container within the preset range.

[0026] Further, in the above-mentioned ink circulation flow control method, the ink fountain is connected with a heating device, the heating device is electrically connected with the controller, and in the step 1, the method further comprises: controlling the heating device to be turned on.

[0027] Further, in the above-mentioned ink circulation flow control method, the ink concentration adjusting container is provided with a stirring device, the stirring device is electrically connected with the controller, and in the step 1, the method further comprises: controlling the stirring device to be turned on.

[0028] Further, in the above-mentioned ink circulation flow control method, the hot water pipeline is connected with a flow sensor, and the flow sensor is electrically connected with the controller.

[0029] Further, in the above-mentioned ink circulation flow control method, the controller is a PLC.

[0030] Further, in the above-mentioned ink circulation flow control method, the ink circulation system further comprises:

[0031] A protective cover is arranged above the ink tray, and the protective cover is provided with a avoiding hole for avoiding the ink roller.

[0032] Further, in the above-mentioned ink circulation flow control method, the distance between the edge of the avoiding hole and the edge of the ink roller is 1-10mm.

[0033] Further, in the above-mentioned ink circulation flow control method, the protective cover is provided with a refrigeration device.

[0034] Further, in the above-mentioned ink circulation flow control method, the bottom of the ink tray is provided with a heat preservation device.

[0035] The beneficial effects of the present application are that: by setting the ink concentration adjusting container, the ink in the ink fountain is combined with hot water to adjust the concentration suitable for printing, and then pumped into the ink tray, the surface of the ink tray is attached with ink through the rotation of the ink roller, and the surface of the packaging film is printed through the process of clamping the packaging film by the transfer roller and the ink roller. Since hot water and ink are used for dilution and adjustment, on the one hand, the mixing and uniformity of the ink and hot water are accelerated, on the other hand, the drying speed of the ink on the packaging film is accelerated, the drying time is reduced, the production efficiency is improved, and on the other hand, the excess ink of the ink tray is overflowed back to the ink fountain through the overflow port for circulation, the ink in the ink fountain realizes circulation flow through the second pipeline and the three-way valve, so that the ink in the ink fountain always keeps flowing state, avoids precipitation and stratification caused by long-term standing, through the ink concentration adjustment and circulation system and control method, the ink in the ink tray can always keep the appropriate ink concentration, even if the water in the high-temperature ink on the ink tray evaporates a lot, the ink concentration on the ink tray can always be controlled in the appropriate range, and the printing depth of the packaging film of the same batch is uniform. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The structure diagram of the ink circulation system involved in the specific embodiment of the present application is shown in the figure.

[0037] Label explanation:

[0038] 1, ink tray; 11, heat preservation device;

[0039] 2, ink roller;

[0040] 3, transfer roller;

[0041] 4, packaging film;

[0042] 5, ink concentration adjusting container; 51, concentration detector;

[0043] 6, first pipeline; 61, first liquid pump; 62, first electromagnetic valve;

[0044] 7, hot water pipeline; 71, second liquid pump; 72, second electromagnetic valve; 73, flow sensor;

[0045] 8, ink fountain; 81, heating device; 82, third pipeline;

[0046] 9, second pipeline; 91, main pipe; 911, third liquid pump; 92, first branch pipe; 93, second branch pipe; 94, three-way valve;

[0047] 10, protective cover; 101, avoiding hole; 102, first guide plate; 103, second guide plate. DETAILED DESCRIPTION

[0048] In order to explain the technical contents, the purposes and the effects of the present application in detail, the following will be described in conjunction with the embodiments and the accompanying drawings.

[0049] Please refer to Figure 1 The embodiment of the present application relates to an ink circulation flow control method of a printing mechanism, which is based on an ink circulation system, the ink circulation system comprising:

[0050] a rack;

[0051] an ink tray 1 connected to the rack;

[0052] an ink roller 2 rotatably connected to the rack, a lower part of the ink roller 2 being immersed in the ink tray 1;

[0053] a transfer roller 3 rotatably connected to the rack, the transfer roller 3 being located above the ink roller 2 and being used to cooperate with the ink roller 2 to clamp the packaging film 4;

[0054] an ink concentration adjusting container 5 connected to the ink tray 1 through a first pipeline 6, the ink concentration adjusting container 5 being provided with a concentration detector 51;

[0055] a first liquid pump 61 connected to the first pipeline 6 and used to pump the ink in the ink concentration adjusting container 5 into the ink tray 1;

[0056] a first electromagnetic valve 62 connected to the first pipeline 6;

[0057] a hot water pipeline 7, a terminal end of the hot water pipeline 7 being connected to the ink concentration adjusting container 5;

[0058] a second liquid pump 71 connected to the hot water pipeline 7 and used to pump hot water into the ink concentration adjusting container 5;

[0059] a second electromagnetic valve 72 connected to the second pipeline 9;

[0060] an ink fountain 8 connected to the rack;

[0061] a second pipeline 9, the second pipeline 9 comprising a main pipeline 91, a first branch pipeline 92 and a second branch pipeline 93, a starting end of the main pipeline 91 being connected to the ink fountain 8, a terminal end of the main pipeline 91 being connected to a starting end of the first branch pipeline 92 and a starting end of the second branch pipeline 93 through a three-way valve 94, a terminal end of the first branch pipeline 92 being connected to the ink concentration adjusting container 5, and a terminal end of the second branch pipeline 93 being connected to the ink fountain 8;

[0062] a third liquid pump 911 connected to the main pipeline 91;

[0063] The third pipe 82 has an overflow port on one side of the ink tray 1. The beginning of the third pipe 82 is connected to the overflow port, and the end of the third pipe 82 is connected to the ink fountain 8.

[0064] The controller is electrically connected to the first liquid pump 61, the second liquid pump 71, the third liquid pump 911, the first solenoid valve 62, the second solenoid valve 72, the three-way valve 94, and the concentration detector 51.

[0065] The ink circulation flow control method includes the following steps:

[0066] Step 1: Control the first liquid pump 61 and the first solenoid valve 62 to close, control the second liquid pump 71, the second solenoid valve 72 and the third liquid pump 911 to open, and control the three-way valve 94 to increase the opening of the passage to the first branch pipe 92, so that the hot water and the ink in the ink fountain 8 are mixed in the ink concentration adjustment container 5.

[0067] Step 2: Based on the concentration detected by the concentration detector 51, adjust the opening of the second solenoid valve 72 and the three-way valve 94 until the concentration detected by the concentration detector 51 reaches the preset value, and control the first liquid pump 61 and the first solenoid valve 62 to open, so that the ink in the ink concentration adjustment container 5 is pumped into the ink tray 1.

[0068] Step 3: Control the concentration detector 51 to continuously detect the ink concentration in the ink concentration adjustment container 5, and finely adjust the opening of the second solenoid valve 72 and the three-way valve 94 according to the detection value to keep the ink in the ink concentration adjustment container 5 within the preset range.

[0069] In the above embodiments, by setting up an ink concentration adjustment container 5, the ink in the ink fountain 8 is mixed with hot water to a suitable printing concentration before being pumped into the ink tray 1. The ink roller 2 rotates, causing ink to adhere to its surface. During the process of conveying the packaging film 4 through the transfer roller 3 and the ink roller 2, ink is printed on the surface of the packaging film 4. Because hot water is used to dilute and mix the ink, the mixing of ink and hot water is accelerated, and the drying speed of the ink on the packaging film 4 is also accelerated, reducing subsequent drying time and improving production efficiency. Furthermore, excess ink in the ink tray 1 overflows back into the ink fountain 8 through the overflow port for circulation. The ink fountain 8 is circulated through the second pipe 9 and the three-way valve 94, ensuring that the ink in the ink fountain 8 remains in a flowing state, preventing sedimentation and stratification caused by prolonged stagnation. Through the ink concentration adjustment and circulation system and control method, the ink in the ink tray 1 can always maintain a suitable ink concentration. Even if a large amount of moisture evaporates from the high-temperature ink on the ink tray 1, the ink concentration on the ink tray 1 can still be controlled within a suitable range, ensuring uniform printing depth for the packaging film 4 in the same batch.

[0070] In a preferred embodiment, the ink fountain 8 is connected to a heating device 81, which is electrically connected to a controller. Step 1 further includes: controlling the heating device 81 to turn on.

[0071] In the above embodiments, the ink fountain 8 itself is heated by the heating device 81, so that the ink in the ink tray 1 is kept at a high temperature through circulation, thereby further making the ink printed on the packaging film 4 dry faster. The heating device 81 can be in various forms, such as setting an electric heating wire outside the ink fountain 8 to heat the ink fountain 8 by heat transfer.

[0072] In a preferred embodiment, the ink concentration adjusting container 5 is provided with a stirring device, which is electrically connected to the controller. Step 1 further includes: controlling the stirring device to turn on.

[0073] In the above embodiments, the stirring device can be a stirring rod driven by a motor. The stirring rod extends into the ink concentration adjustment container 5 to stir and mix the ink and hot water therein evenly. This structure is not shown in the figure.

[0074] In a preferred embodiment, the hot water pipe 7 is connected to a flow sensor 73, which is electrically connected to the controller.

[0075] In a preferred embodiment, the controller is a PLC.

[0076] In a preferred embodiment, the ink circulation system further includes:

[0077] A protective cover 10 is disposed above the ink tray 1, and the protective cover 10 is provided with a clearance hole 101 for avoiding the ink roller 2.

[0078] In a preferred embodiment, the distance between the edge of the clearance hole 101 and the edge of the ink roller 2 is 1-10 mm.

[0079] In the above embodiments, the protective cover 10 avoids the ink roller 2 only through the avoidance hole 101 in the middle, and a small gap is maintained between the two, so that most of the vapor generated in the ink tray 1 is intercepted by the protective cover 10, and the vapor is prevented from directly acting on the packaging film 4 above and affecting the printing quality of the packaging film 4.

[0080] In a preferred embodiment, the protective cover 10 is provided with a cooling device.

[0081] Preferably, one side of the protective cover 10 is provided as an inclined first guide plate 102. The lower end of the first guide plate 102 is connected to the ink concentration adjustment container 5. The refrigeration device can take many forms. For example, the evaporator of the refrigeration device can be coiled around the upper part of the first guide plate 102, so that the vapor generated by the evaporation of ink in the ink tray 1 is condensed on the first guide plate 102. The surface tension of the condensate is used to make the condensate flow back to the ink concentration adjustment container 5 along the first guide plate 102, so as to avoid the vapor directly acting on the packaging film 4 above and avoid the vapor affecting the quality of the packaging film 4. On the other hand, the vapor is recovered by condensation, which reduces the vapor diffusion into the surrounding environment.

[0082] Preferably, an inclined second guide plate 103 is provided on the other side of the protective cover 10. The lower end of the second guide plate 103 is connected to the third pipe 82. The refrigeration device can take many forms. For example, the evaporator of the refrigeration device can be coiled around the upper part of the second guide plate 103, so that some of the vapor condenses on the second guide plate 103. Using the surface tension of the condensate, the condensate flows along the second guide plate 103 to the third pipe 82 and flows back to the ink fountain 8 through the third pipe 82. This prevents the ink in the ink fountain 8 from becoming too dry and viscous, and ensures that the ink in the ink fountain 8 has good fluidity.

[0083] As a preferred embodiment, the bottom of the ink tray 1 is provided with a heat preservation device 11, which can ensure that the ink in the ink tray 1 has a high temperature, thereby further enabling the ink printed onto the packaging film 4 to dry faster. The heat preservation device 11 can take many forms, such as a coiled heating wire at the bottom of the ink tray 1, which heats and preserves the ink in the ink tray 1 through heat transfer.

[0084] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for controlling the ink circulation flow in a printing mechanism, characterized in that, Based on the ink recycling system, the ink recycling system includes: frame; Ink tray, the ink tray being connected to the frame; An ink roller, rotatably connected to the frame, with its lower part immersed in an ink tray; A transfer roller, rotatably connected to the frame, is positioned above the ink roller and is used to cooperate with the ink roller to clamp and feed the packaging film; An ink concentration adjusting container is connected to an ink tray via a first pipe, and a concentration detector is installed inside the ink concentration adjusting container; A first liquid pump, connected to a first pipeline, is used to pump ink from an ink concentration adjustment container into an ink tray; A first solenoid valve is connected to a first pipeline; A hot water pipe, the end of which is connected to an ink concentration adjustment container; The second liquid pump, which is connected to the hot water pipe, is used to pump hot water into the ink concentration adjustment container; The second solenoid valve is connected to the second pipeline; Ink fountain, which is connected to the frame; The second pipe includes a main pipe, a first branch pipe, and a second branch pipe. The beginning of the main pipe is connected to the ink fountain, and the end of the main pipe is connected to the beginning of the first branch pipe and the beginning of the second branch pipe respectively through a three-way valve. The end of the first branch pipe is connected to the ink concentration adjustment container, and the end of the second branch pipe is connected to the ink fountain. A third liquid pump, which is connected to the main pipe; The third pipe has an overflow port on one side of the ink tray, the beginning of the third pipe is connected to the overflow port, and the end of the third pipe is connected to the ink fountain. The controller is electrically connected to the first liquid pump, the second liquid pump, the third liquid pump, the first solenoid valve, the second solenoid valve, the three-way valve, and the concentration detector, respectively. The ink circulation system also includes: A protective cover is disposed above the ink tray, and the protective cover is provided with clearance holes for avoiding the ink roller; One side of the protective cover is configured as an inclined first guide plate, and the lower end of the first guide plate is connected to the ink concentration adjustment container; An inclined second guide plate is provided on the other side of the protective cover, and the lower end of the second guide plate is connected to a third pipe; The ink circulation flow control method includes the following steps: Step 1: Control the first liquid pump and the first solenoid valve to close, control the second liquid pump, the second solenoid valve and the third liquid pump to open, and control the three-way valve to increase the opening of the first branch pipe passage, so that the hot water and the ink in the ink fountain can be mixed in the ink concentration adjustment container. Step 2: Based on the concentration detected by the concentration detector, adjust the opening of the second solenoid valve and the three-way valve until the concentration detected by the concentration detector reaches the preset value, and control the first liquid pump and the first solenoid valve to open, so that the ink in the ink concentration adjustment container is pumped into the ink tray. Step 3: Control the concentration detector to continuously monitor the ink concentration in the ink concentration adjustment container, and fine-tune the opening of the second solenoid valve and the three-way valve according to the detection value to keep the ink in the ink concentration adjustment container within the preset range.

2. The ink circulation control method for a printing mechanism according to claim 1, characterized in that, The ink fountain is connected to a heating device, which is electrically connected to a controller. Step 1 further includes: controlling the heating device to turn on.

3. The ink circulation control method for a printing mechanism according to claim 1, characterized in that, The ink concentration adjustment container is equipped with a stirring device, which is electrically connected to the controller. Step 1 further includes: controlling the stirring device to turn on.

4. The ink circulation control method for a printing mechanism according to claim 1, characterized in that, The hot water pipe is connected to a flow sensor, which is electrically connected to the controller.

5. The ink circulation control method for a printing mechanism according to claim 1, characterized in that, The controller is a PLC.

6. The ink circulation control method for a printing mechanism according to claim 1, characterized in that, The distance between the edge of the clearance hole and the edge of the ink roller is 1-10mm.

7. The ink circulation control method for a printing mechanism according to claim 1, characterized in that, The protective cover is equipped with a cooling device.

8. The ink circulation control method for a printing mechanism according to claim 1, characterized in that, The bottom of the ink tray is equipped with a heat preservation device.

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