Glue discharging device and method for MLCC

Abstract

The invention relates to the technical field of capacitor glue discharging, in particular to a glue discharging device and method for an MLCC, and the device comprises a glue discharging box for placing an MLCC green body, the side end of the glue discharging box is provided with an air inlet, the outer side of the glue discharging box is provided with a humidifying barrel, the interior of the humidifying barrel is provided with a protective atmosphere, and the interior of the humidifying barrel is provided with a heater. Heated and humidified protective atmosphere is supplied to the air inlet through a connecting pipe, and the glue discharging device further comprises a rotating frame arranged in the glue discharging box; a circulation gap is formed between every two rotating disc sets, and the rotating disc sets are evenly distributed in the glue discharging box; and the multiple blank containing boxes are evenly distributed on the rotating disc set, MLCC green bodies are placed in the blank containing boxes and among the circulation gaps, during use, the gas pressure can be effectively increased through heated and humidified nitrogen, emission of organic matter in the glue discharging process is promoted, the glue discharging effect can be optimized through an introduced wet nitrogen glue discharging mode, and the oxidation problem can also be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitor debonding, and in particular to a debonding device and method for MLCC. Background Art

[0002] MLCC debinding refers to the process of heat treating the cut ceramic green body to decompose and discharge the organic matter such as binder, plasticizer, dispersant, etc. added to the ceramic powder under certain temperature conditions. Debinding can effectively avoid defects such as delamination and cracking caused by the rapid volatilization of organic matter during the sintering of the ceramic body, thereby improving product reliability. Choosing the appropriate temperature, heating rate and exhaust volume will directly affect the debinding effect of the MLCC chip.

[0003] For example, a Chinese patent with application number CN202311655447.8 discloses a debinding method for MLCC, wherein the method comprises: preparing MLCC green bodies, and evenly placing the MLCC green bodies in a debinding box; introducing a first gas into the debinding box, and raising the temperature in the debinding box to a first preset temperature within a first preset time period; switching the first gas introduced into the debinding box to a second gas, and converting the temperature in the debinding box to a second preset temperature within a second preset time period; switching the second gas introduced into the debinding box to the first gas, and lowering the temperature in the debinding box to room temperature to obtain a debinding-completed MLCC. Compared with the debinding by atmosphere alone, switching the debinding by atmosphere midway can better remove organic matter inside the MLCC green body, shorten the debinding time, have high debinding efficiency, and save nitrogen usage and energy consumption. However, for nickel electrode MLCC, air debinding is adopted. Since nickel will be oxidized above 300℃ in air, the debinding temperature of nickel inner electrode MLCC in air is usually set between 250℃-280℃. However, as the product capacitance value becomes higher and higher, the nickel electrode powder becomes finer and finer. If gas switching is adopted, premature oxidation problem is very likely to occur, and the debinding effect is poor. Summary of the invention

[0004] In view of this, the purpose of the present invention is to propose a debinding device and method for MLCC, so as to solve the problem that the prior art uses air debinding for nickel electrode MLCC. Since nickel will be oxidized above 300°C in the air, the debinding temperature of nickel inner electrode MLCC in the air is usually set between 250°C and 280°C. However, as the product capacitance value becomes higher and higher, the nickel electrode powder becomes finer and finer. If the gas switching method is used, it is very easy to cause the problem of premature oxidation and poor debinding effect.

[0005] Based on the above purpose, the present invention provides a debinding device for MLCC, comprising a debinding box for placing MLCC green sheets, an air inlet is arranged at the side end of the debinding box, a humidifying barrel is arranged on the outside of the debinding box, a protective atmosphere is supplied in the humidifying barrel, a heater is arranged in the humidifying barrel, and a heated and humidified protective atmosphere is supplied to the air inlet through a connecting pipe, and the debinding device also includes:

[0006] A rotating frame, the rotating frame is arranged in the binder removal box;

[0007] Rotating disc groups, wherein flow gaps are provided between the rotating disc groups, and there are a plurality of rotating disc groups, and the rotating disc groups are evenly distributed in the debinding box;

[0008] A blank placing box, wherein there are a plurality of blank placing boxes, and the blank placing boxes are evenly distributed on the rotating disk group, and MLCC green blanks are placed between the flow gaps in the blank placing boxes;

[0009] A driving mechanism for driving the rotating frame to rotate;

[0010] A transmission mechanism is used to drive the rotating disk group to perform a movement with a constant direction.

[0011] Furthermore, heat insulation cotton and a heating belt are provided in the connecting pipe.

[0012] Furthermore, the driving mechanism comprises:

[0013] A driving motor, the driving motor is fixedly mounted on the inner bottom of the glue removal box, and a driving wheel is installed at the output end of the driving motor;

[0014] A driven wheel, the driven wheel is rotatably mounted on one side of the fixing frame, and the driven wheel is connected to the driving wheel through a synchronous belt;

[0015] A driving roller, the driving roller is coaxially connected to the driven wheel, and the outer edge of the rotating frame abuts against the driving roller;

[0016] The driven roller is rotatably mounted on the other side of the fixed frame, and the driven roller abuts against the outer edge of the rotating frame.

[0017] Furthermore, a protective cover is provided on the outside of the driving motor.

[0018] Furthermore, the transmission mechanism comprises:

[0019] A transmission turntable, the transmission turntable is rotatably mounted on the fixed frame, and the transmission turntable and the rotating frame are staggered in both horizontal and vertical directions;

[0020] A connecting rod, both ends of which are rotatably mounted on the transmission turntable and the rotating frame respectively;

[0021] A support frame, the rotating disk group is installed on the support frame, and the end of the connecting rod passes through the transmission turntable and is connected to the support frame.

[0022] Furthermore, the rotating disk group includes a fixed disk and a movable disk, a telescopic rod is installed on the fixed disk, and an end of the telescopic rod passes through the fixed disk and is connected to the movable disk.

[0023] Furthermore, a slide bar is installed on the movable disk, the movable disk is slidably arranged on the slide bar, a spring is sleeved on the slide bar, one end of the spring abuts against the movable disk, and the other end of the spring abuts against the fixed disk.

[0024] Furthermore, a bracket is detachably provided in the blank placing box.

[0025] Furthermore, the binder removal box is provided with an air flow meter and a protective atmosphere flow meter.

[0026] The present invention also provides a method of use, which is based on the debinding device for MLCC as described in any one of the above items, comprising the following steps:

[0027] S1. Pure water is stored in the humidification barrel, which is heated by the built-in heater to form a constant temperature environment of 30-80℃ in the humidification barrel;

[0028] S2, placing the MLCC green billets to be debinded in each billet box in turn, and positioning them by the rotating disk group, the MLCC green billets are kept in the flow gap, and the protective atmosphere nitrogen can flow smoothly between the flow gaps;

[0029] S3, select nitrogen as the protective atmosphere, then pass the nitrogen into the humidifying barrel, so that the nitrogen can be heated and humidified, and supply the heated and humidified nitrogen to the debonding box through the connecting pipe;

[0030] S4. During the nitrogen supply process after heating and humidification in S3, each MLCC green body is driven up and down by the driving mechanism and the transmission mechanism, and the orientation of each MLCC green body remains unchanged during the movement. The debinding temperature is 400°C and the nitrogen flow rate is 200L / min.

[0031] Beneficial effects of the present invention: When a debinding device and method for MLCC of the present invention is used, the gas pressure can be effectively increased by heating and humidifying nitrogen, thereby promoting the discharge of organic matter during the debinding process. The introduction of wet nitrogen debinding method can optimize the debinding effect and avoid oxidation problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 is a process flow chart of the present invention;

[0034] Figure 2 It is a schematic diagram of the external structure of the debinding device for MLCC in the present invention;

[0035] Figure 3 It is a schematic diagram of the internal structure of the debinding device for MLCC in the present invention;

[0036] Figure 4 It is a schematic diagram of the assembly of the driving mechanism in the present invention;

[0037] Figure 5 It is a schematic diagram of the assembly of the rotating disk group and the rotating frame in the present invention;

[0038] Figure 6 It is a schematic diagram of the assembly of the rotating disk group and the transmission mechanism in the present invention;

[0039] Figure 7 It is a schematic diagram of the assembly of the fixed disk and the movable disk in the present invention.

[0040] The markings in the figure are:

[0041] 1. Glue removal box; 2. Humidification barrel; 3. Connecting pipe; 4. Rotating frame; 5. Blank placing box; 6. Driving motor; 7. Fixed frame; 8. Driven wheel; 9. Synchronous belt; 10. Active roller; 11. Driven roller; 12. Transmission turntable; 13. Connecting rod; 14. Support frame; 15. Fixed plate; 16. Movable plate; 17. Telescopic rod; 18. Sliding rod; 19. Spring; 20. Bracket; 21. Air flow meter; 22. Protective atmosphere flow meter. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0043] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0044] The embodiment of the present invention provides a debinding device for MLCC, such as Figure 1-7 As shown, it includes a debinding box 1 for placing MLCC green bodies, an air inlet is arranged at the side end of the debinding box 1, a humidifying barrel 2 is arranged on the outside of the debinding box 1, a protective atmosphere is supplied in the humidifying barrel 2, a heater is arranged in the humidifying barrel 2, and a heated and humidified protective atmosphere is supplied to the air inlet through a connecting pipe 3. The debinding device also includes:

[0045] A rotating frame 4 is arranged in the glue removal box 1;

[0046] Rotating disc groups, with flow gaps between the rotating disc groups, there are several rotating disc groups, and the rotating disc groups are evenly distributed in the glue removal box 1;

[0047] There are several blank placing boxes 5, which are evenly distributed on the rotating disk group, and MLCC green blanks are placed between the circulation gaps in the blank placing boxes 5;

[0048] A driving mechanism for driving the rotating frame 4 to rotate;

[0049] A transmission mechanism used to drive the rotating disk group to perform a movement without changing its direction.

[0050] In this embodiment, insulation cotton and heating belt are provided in the connecting pipe 3. The insulation cotton and heating belt are required to maintain a certain temperature in the connecting pipe 3 through which gas is introduced to keep warm, so as to ensure that the protective atmosphere entering the debinding box 1 is gas without condensed water.

[0051] In this embodiment, the driving mechanism includes:

[0052] A driving motor 6 is arranged at the inner bottom of the glue removal box 1 through a fixing frame 7, and a driving wheel is installed at the output end of the driving motor 6;

[0053] A driven wheel 8 is rotatably mounted on one side of the fixed frame 7, and the driven wheel 8 is connected to the driving wheel through a synchronous belt 9;

[0054] The driving roller 10 is coaxially connected with the driven wheel 8, and the outer edge of the rotating frame 4 abuts against the driving roller 10;

[0055] The driven roller 11 is rotatably mounted on the other side of the fixed frame 7 , and the driven roller 11 abuts against the outer edge of the rotating frame 4 .

[0056] In this embodiment, a protective cover is provided outside the driving motor 6 .

[0057] In this embodiment, the transmission mechanism includes:

[0058] A transmission turntable 12, the transmission turntable 12 is rotatably mounted on the fixed frame 7, and the transmission turntable 12 and the rotating frame 4 are staggered in both horizontal and vertical directions;

[0059] A connecting rod 13, both ends of which are rotatably mounted on the transmission turntable 12 and the rotating frame 4;

[0060] The support frame 14 is provided with a rotating disk assembly mounted on the support frame 14 , and the end of the connecting rod 13 passes through the transmission rotating disk 12 and is connected to the support frame 14 .

[0061] In this embodiment, the rotating disk assembly includes a fixed disk 15 and a movable disk 16 . A telescopic rod 17 is mounted on the fixed disk 15 . An end of the telescopic rod 17 passes through the fixed disk 15 and is connected to the movable disk 16 .

[0062] In this embodiment, a protective cover is provided on the outside of the telescopic rod 17 .

[0063] In this embodiment, the binder removal box 1 is provided with an air flow meter 21 and a protective atmosphere flow meter 22 .

[0064] The method of using the above-mentioned debinding device for MLCC comprises the following steps:

[0065] S1, pure water is stored in the humidifying barrel 2, and after being heated by the built-in heater, a constant temperature environment of 30-80°C is formed in the humidifying barrel 2;

[0066] S2, placing the MLCC green sheets to be debinded in each of the green sheet boxes 5 in turn, and positioning them by the rotating disk group, the MLCC green sheets are kept in the flow gap, and the protective atmosphere nitrogen can flow smoothly between the flow gaps;

[0067] S3, selecting nitrogen as the protective atmosphere, and then passing the nitrogen into the humidifying barrel 2, so that the nitrogen can be heated and humidified, and the heated and humidified nitrogen is supplied to the debinding box 1 through the connecting pipe 3;

[0068] S4. During the nitrogen supply process after heating and humidification in S3, each MLCC green body is driven up and down by the driving mechanism and the transmission mechanism, and the orientation of each MLCC green body remains unchanged during the movement. The debinding temperature is 400°C and the nitrogen flow rate is 200L / min.

[0069] In this embodiment, when the above-mentioned moisture debinding step is used, the humidifying barrel 2 maintains a certain water level. In order to detect the water level, water level detection is added to control the water level more accurately. Then, the driving motor 6 in the driving mechanism drives the active roller 10 to rotate, and then cooperates with the driven roller 11 on the other side to drive the rotating frame 4 to rotate, and then the MLCC green billets in the circulation gap can be driven to reciprocate up and down, so as to avoid differences in the debinding environment of the MLCC green billets at different heights in the debinding box 1, and ensure that each MLCC green billet can achieve debinding conditions of the same temperature and pressure;

[0070] At the same time, under the action of the transmission mechanism, the rotating rotating frame 4 cooperates with the connecting rod 13, which will also drive the various rotating disk groups on the transmission turntable 12 that are staggered in both horizontal and vertical directions to perform synchronous lifting and lowering actions with unchanged directions, thereby making the debinding direction of each MLCC green billet unchanged, thereby preventing the volatile organic substances decomposed from the MLCC green billet located below from affecting the debinding of the MLCC green billet above.

[0071] Compare with the traditional dry debinding without humidification under the same conditions;

[0072] Weight loss comparison: Using the same temperature of 400℃ and the same debinding for 2H, taking the temperature rise of 0.5℃ / min, 5mm*5mm*2mm MLCC semi-finished product as an example (the same ceramic film is stacked, and the organic matter content is equivalent), the nitrogen flow rate is also 200L / min, and the weight ratio of the semi-finished product before and after firing is weighed to measure the difference:

[0073]

[0074] From the product comparison, the difference in weight loss is ~0.58%;

[0075] Failure data comparison: the temperature was increased by 0.5℃ / min, the temperature was 400℃ for debinding for 2H, half of them were humidified, numbered 1; the other half were not humidified, and the sintering was also sintered at 1320℃, numbered 2. According to the general MLCC process of chamfering-copper dipping-burning end-electroplating-testing, and then the product reliability was evaluated. 40pcs of products were taken and the products were pressurized 4 times (rated voltage 16V), that is, 64V, at a temperature of 85℃:

[0076] Product Number Voltage 64V / Temperature 85℃ / Time 96h 1 2pcs failed, the time was 37h and 46h respectively 2 No failure

[0077] By comparing the failure time, it was found that products without humidification are prone to premature death. Humidification can obviously improve product reliability and solve the variability problem in the process.

[0078] In this embodiment, if Figure 6 As shown, a slide bar 18 is installed on the movable disk 16, and the movable disk 16 is slidably arranged on the slide bar 18. A spring 19 is sleeved on the slide bar 18. One end of the spring 19 abuts against the movable disk 16, and the other end of the spring 19 abuts against the fixed disk 15, so as to realize flexible clamping and positioning of the MLCC green billet in the billet box 5 to avoid damage to the product during the positioning process.

[0079] In this embodiment, if Figure 6 As shown, a bracket 20 is detachably provided in the blank placing box 5. According to different specifications of MLCC blanks, the bracket 20 of the corresponding model can be replaced, so that the debinding device is more adaptable.

[0080] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0081] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A binder removal device for MLCC, comprising a binder removal box (1) for placing MLCC green sheets, wherein an air inlet is arranged at a side end of the binder removal box (1), characterized in that: A humidifying barrel (2) is provided outside the debinding box (1), a protective atmosphere is supplied inside the humidifying barrel (2), a heater is provided inside the humidifying barrel (2), and the heated and humidified protective atmosphere is supplied to the air inlet through a connecting pipe (3), and the debinding device further comprises: A rotating frame (4), wherein the rotating frame (4) is arranged in the binder removal box (1); A rotating disk group, wherein a flow gap is provided between the rotating disk groups, and there are a plurality of rotating disk groups, and the rotating disk groups are evenly distributed in the debinding box (1); A blank placing box (5), wherein there are a plurality of blank placing boxes (5), and the blank placing boxes (5) are evenly distributed on the rotating disk group, and MLCC green blanks are placed in the blank placing boxes (5) between the flow gaps; A driving mechanism for driving the rotating frame (4) to rotate; A transmission mechanism is used to drive the rotating disk group to perform a movement with a constant direction.

2. A binder removal device for MLCC according to claim 1, characterized in that: The connecting pipe (3) is provided with heat insulation cotton and a heating belt.

3. A binder removal device for MLCC according to claim 1, characterized in that: The driving mechanism comprises: A driving motor (6), wherein the driving motor (6) is arranged at the inner bottom of the adhesive removal box (1) via a fixing frame (7), and a driving wheel is installed at the output end of the driving motor (6); A driven wheel (8), the driven wheel (8) being rotatably mounted on one side of the fixed frame (7), and the driven wheel (8) being connected to the driving wheel via a synchronous belt (9); A driving roller (10), wherein the driving roller (10) is coaxially connected to the driven wheel (8), and the outer edge of the rotating frame (4) abuts against the driving roller (10); A driven roller (11), wherein the driven roller (11) is rotatably mounted on the other side of the fixed frame (7), and the driven roller (11) abuts against the outer edge of the rotating frame (4).

4. A binder removal device for MLCC according to claim 3, characterized in that: A protective cover is provided on the outside of the driving motor (6).

5. A binder removal device for MLCC according to claim 3, characterized in that: The transmission mechanism comprises: A transmission turntable (12), the transmission turntable (12) being rotatably mounted on the fixed frame (7), the transmission turntable (12) and the rotating frame (4) being staggered in both horizontal and vertical directions; A connecting rod (13), the two ends of which are rotatably mounted on the transmission turntable (12) and the rotating frame (4) respectively; A support frame (14), the rotating disk group is installed on the support frame (14), and the end of the connecting rod (13) passes through the transmission rotating disk (12) and is connected to the support frame (14).

6. A binder removal device for MLCC according to claim 1, characterized in that: The rotating disk group comprises a fixed disk (15) and a movable disk (16); a telescopic rod (17) is installed on the fixed disk (15); an end of the telescopic rod (17) passes through the fixed disk (15) and is connected to the movable disk (16).

7. A binder removal device for MLCC according to claim 6, characterized in that: A slide bar (18) is installed on the movable disk (16), and the movable disk (16) is slidably arranged on the slide bar (18). A spring (19) is sleeved on the slide bar (18), and one end of the spring (19) abuts against the movable disk (16), and the other end of the spring (19) abuts against the fixed disk (15).

8. The binder removal device for MLCC according to claim 1, characterized in that: The blank placing box (5) is detachably provided with a bracket (20).

9. A binder removal device for MLCC according to claim 1, characterized in that: The binder removal box (1) is provided with an air flow meter (21) and a protective atmosphere flow meter (22).

10. A method for using the debinding device for MLCC according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1, pure water is stored in the humidifying barrel (2), and after being heated by the built-in heater, a constant temperature environment of 30 to 80° C. is formed in the humidifying barrel (2); S2, placing the MLCC green sheets to be debinded in each of the green sheet boxes (5) in turn, and positioning them by a rotating disk assembly, so that the MLCC green sheets are kept in the flow gap, and the protective atmosphere nitrogen can flow smoothly between the flow gaps; S3, selecting nitrogen as the protective atmosphere, and then passing the nitrogen into the humidifying barrel (2) so that the nitrogen can be heated and humidified, and supplying the heated and humidified nitrogen to the debinding box (1) through the connecting pipe (3); S4. During the nitrogen supply process after heating and humidification in S3, each MLCC green body is driven up and down by the driving mechanism and the transmission mechanism, and the orientation of each MLCC green body remains unchanged during the movement. The debinding temperature is 400°C and the nitrogen flow rate is 200L / min.

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