Hot pressing system

Abstract

The utility model relates to a hot pressing system. The hot pressing system comprises a hot press, a nitrogen supply unit, a vacuumizing unit and a control unit. The hot press is provided with a hot pressing cavity, and a vacuumizing opening and a nitrogen filling opening are formed in the hot pressing cavity; the nitrogen supply unit is connected with the nitrogen filling port through a first pipeline, and a first valve is arranged on the first pipeline; the vacuumizing unit is connected with the vacuumizing opening through a second pipeline, and a second valve is arranged on the second pipeline; the control unit comprises a controller, a vacuum sensor and an oxygen content sensor, the controller is in signal connection with the vacuum sensor, the oxygen content sensor, the first valve and the second valve, the vacuum sensor is used for detecting the vacuum degree in the hot press, and the controller is used for controlling the first valve to be opened according to the vacuum degree. The oxygen content sensor is used for detecting the oxygen content in the hot press, and the controller is used for controlling the first valve and the second valve to be closed according to the oxygen content.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit board manufacturing, in particular to a hot-pressing system. BACKGROUND

[0002] The hot-pressing process of a circuit board generally refers to the pressing process of a multi-layer circuit board, that is, a plurality of inner-layer circuit boards and a copper foil are bonded together by heating and pressing to form a solid multi-layer circuit board. A hot-pressing machine is an important production equipment in the hot-pressing process of a circuit board, and provides a necessary high-temperature and high-pressure environment for the production of a circuit board.

[0003] However, since the circuit board is in a high-temperature and high-pressure state in the hot-pressing machine, the copper-clad etching layer used to form the circuit board is prone to oxidation reaction with the residual oxygen in the hot-pressing machine, which affects the quality of the circuit board. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a hot-pressing system in view of the problem that the circuit board is prone to oxidation reaction in the hot-pressing process.

[0005] A hot-pressing system, comprising:

[0006] a hot-pressing machine having a hot-pressing chamber, wherein a vacuum extraction port and a nitrogen charging port are respectively formed on the hot-pressing chamber, and the vacuum extraction port is located above the nitrogen charging port;

[0007] a nitrogen supply unit connected to the nitrogen charging port through a first pipeline, wherein a first valve is arranged on the first pipeline;

[0008] a vacuum extraction unit connected to the vacuum extraction port through a second pipeline, wherein a second valve is arranged on the second pipeline; and

[0009] a control unit comprising a controller, a vacuum sensor and an oxygen content sensor, wherein the controller is signal-connected to the vacuum sensor, the oxygen content sensor, the first valve and the second valve, respectively, the vacuum sensor is used to detect the vacuum degree in the hot-pressing machine, the controller is used to control the first valve to be opened according to the vacuum degree, the oxygen content sensor is used to detect the oxygen content in the hot-pressing machine, and the controller is used to control the first valve and the second valve to be closed according to the oxygen content.

[0010] In one of the embodiments, the nitrogen charging port is located on the side of the hot-pressing chamber away from the vacuum extraction port.

[0011] In one of the embodiments, the oxygen content sensor is connected to the second pipeline, and the oxygen content sensor is located on the side of the second valve close to the hot-pressing machine.

[0012] In one of the embodiments, the vacuum pumping unit comprises a vacuum pump connected to the vacuum pumping port through the second pipeline, and a second filter arranged on the second pipeline.

[0013] In one of the embodiments, the hot-pressing system further comprises a pressure relief unit connected to the hot press through a third pipeline, and the vacuum sensor is connected to the third pipeline.

[0014] In one of the embodiments, the pressure relief unit comprises a third filter arranged on the third pipeline, and a third stop valve, wherein the third filter is located on the side of the third stop valve away from the hot press, and the third stop valve is connected to the controller.

[0015] In one of the embodiments, the nitrogen supply unit comprises a nitrogen generator for generating nitrogen from air, and the nitrogen generator is connected to the nitrogen filling port through a first pipeline.

[0016] In one of the embodiments, the nitrogen supply unit comprises an oil-water separator with an inlet end connected to the nitrogen outlet of the nitrogen generator, and a first filter arranged on the first pipeline, wherein the outlet end of the oil-water separator is connected to the nitrogen filling port through the first pipeline.

[0017] In one of the embodiments, the nitrogen supply unit comprises a pressure reducing valve and a first pressure sensor arranged on the first pipeline, wherein the pressure reducing valve is arranged on the side of the first pressure sensor away from the hot press, and the pressure reducing valve and the first pressure sensor are respectively connected to the controller, and the controller is configured to adjust the opening degree of the pressure reducing valve according to the detected pressure of the first pressure sensor.

[0018] In one of the embodiments, the hot press comprises a heating mechanism arranged in the hot-pressing chamber.

[0019] The hot-pressing system described above, the vacuum pumping unit is configured to remove air inside the hot press to form a high-vacuum low-pressure environment in the hot press, which is conducive to reducing the oxygen content in the air and removing air in the material to be pressed. The vacuum pumping unit and the nitrogen supply unit act simultaneously to simultaneously pump vacuum and fill nitrogen in the hot press, which is further configured to remove air in the hot press to reduce the oxygen content, thereby reducing the oxygen in the material to be pressed, preventing oxidation of the material to be pressed, and improving product quality. At the same time, it can also avoid the oxidation of the hot press components, thereby avoiding the problem of reduced conductivity caused by the oxidation of the hot press components. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1Fig. 1 is a schematic view of a heat press system according to an embodiment of the present application.

[0021] 100, heat press; 110, heat press chamber; 111, vacuum port; 112, nitrogen filling port; 120, heating mechanism;

[0022] 200, nitrogen supply unit; 210, first pipeline; 220, first valve; 230, nitrogen generator; 240, oil-water separator; 250, first filter; 260, pressure reducing valve; 271, first pressure sensor; 272, second pressure sensor; 281, first manual switch; 282, second manual switch;

[0023] 300, vacuum unit; 310, second pipeline; 320, second valve; 330, vacuum pump; 340, second filter;

[0024] 400, control unit; 410, controller; 420, vacuum sensor; 430, oxygen content sensor;

[0025] 500, pressure relief unit; 510, third pipeline; 521, third manual switch; 530, third filter; 540, third stop valve; 550, muffler. DETAILED DESCRIPTION

[0026] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated that there are many alternate embodiments that fall within the scope of the present application. It is also contemplated that there are many alternative ways of implementing the application.

[0027] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0028] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or implicating the number of indicated technical features. Thus, a feature defined with "first" or "second" can include at least one of the features explicitly or implicitly. In the description of the present application, the term "plurality" means at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0029] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the connection or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the present application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the first feature is lower than the second feature in horizontal height.

[0031] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0032] Reference Figure 1The hot pressing system provided by the embodiment of the present application comprises a hot press 100, a nitrogen supply unit 200, a vacuum pumping unit 300 and a control unit 400. The hot press 100 has a hot pressing chamber 110, and the hot pressing chamber 110 is provided with a vacuum pumping port 111 and a nitrogen charging port 112, respectively. The vacuum pumping port 111 is located above the nitrogen charging port 112. The nitrogen supply unit 200 is connected with the nitrogen charging port 112 through a first pipeline 210, and the first pipeline 210 is provided with a first valve 220. The vacuum pumping unit 300 is connected with the vacuum pumping port 111 through a second pipeline 310, and the second pipeline 310 is provided with a second valve 320. The control unit 400 comprises a controller 410, a vacuum sensor 420 and an oxygen content sensor 430. The controller 410 is signal connected with the vacuum sensor 420, the oxygen content sensor 430, the first valve 220 and the second valve 320, respectively. The vacuum sensor 420 is used for detecting the vacuum degree in the hot press 100. The controller 410 is used for controlling the first valve 220 to be opened according to the vacuum degree. The oxygen content sensor 430 is used for detecting the oxygen content in the hot press 100. The controller 410 is used for controlling the first valve 220 and the second valve 320 to be closed according to the oxygen content.

[0033] In use, after the hot press 100 is closed, the controller 410 controls the second valve 320 to be opened first, and the vacuum pumping unit 300 is used for pumping the hot press 100 to reduce the oxygen content in the hot press 100. When the vacuum sensor 420 detects that the vacuum degree in the hot press 100 reaches a preset value, the controller 410 controls the first valve 220 to be opened. The nitrogen supply unit 200 is used for charging nitrogen into the hot press 100. At the same time, the second valve 320 is also in an opened state, that is, the hot press 100 is simultaneously subjected to the actions of vacuum pumping and nitrogen charging, so as to further reduce the oxygen content in the hot press 100. When the oxygen content sensor 430 detects that the oxygen content in the hot press 100 reaches a preset value, the controller 410 controls the first valve 220 and the second valve 320 to be closed, and the hot press 100 is subjected to hot pressing.

[0034] In the embodiment, the vacuum pumping unit 300 is used for pumping the air in the hot press 100, so as to form a high-vacuum low-pressure environment in the hot press 100, which is beneficial to reducing the oxygen content in the air and pumping the air in the material to be pressed and combined. The vacuum pumping unit 300 and the nitrogen supply unit 200 simultaneously act, so as to simultaneously pump the hot press 100 and charge nitrogen, further pump the air in the hot press 100 to reduce the oxygen content, and then reduce the oxygen in the material to be pressed and combined, prevent the material to be pressed and combined from being oxidized, and improve the product quality. At the same time, the components of the hot press 100 can also be prevented from being oxidized, and then the problem of the decrease in the conductive performance caused by the oxidation of the components of the hot press 100 can be avoided.

[0035] The controller 410 can be a PLC or an MCU, etc. The preset value can be pre-stored in the controller, and the specific value can be set according to actual needs.

[0036] The material to be pressed is a material to be pressed for forming a circuit board.

[0037] In some embodiments, the nitrogen filling port 112 is located on the side of the hot pressing chamber 110 away from the vacuum port 111, so as to facilitate the rapid extrusion of nitrogen to expel air in the hot press 100.

[0038] For example, the hot press 100 has a rectangular structure, the vacuum port 111 is located on the upper wall and close to the left wall and the rear wall, and the nitrogen filling port 112 is located on the lower wall and close to the front wall and the right wall.

[0039] In some embodiments, the oxygen content sensor 430 is connected to the second pipeline 310, and the oxygen content sensor 430 is located on the side of the second valve 320 close to the hot press 100.

[0040] In the present embodiment, the vacuum unit 300 draws vacuum in the hot press 100 through the second pipeline 310, the oxygen content sensor 430 is connected to the second pipeline 310 through the pipeline, and the oxygen content in the hot press 100 can be directly detected, and then the detected oxygen content is transmitted to the controller 410. The oxygen content sensor 430 is located on the side of the second valve 320 close to the hot press 100, which facilitates to ensure that the detected oxygen content reflects the oxygen content in the hot press 100 in real time, and at the same time avoids the damage of the high temperature environment in the hot press 100 to the oxygen content sensor 430 when the oxygen content sensor 430 is directly arranged in the hot press 100.

[0041] In some embodiments, the vacuum unit 300 includes a vacuum pump 330 and a second filter 340 arranged on the second pipeline 310, and the vacuum pump 330 is connected to the vacuum port 111 through the second pipeline 310.

[0042] Specifically, the second filter 340 is arranged between the oxygen content sensor 430 and the second valve 320, and the second filter 340 is used to filter impurities in the hot press 100 to prevent impurities from entering the vacuum pump 330. The vacuum unit 300 is signal connected to the controller 410, and the start and stop of the vacuum unit 300 can be controlled through the controller 410.

[0043] In some embodiments, the hot pressing system further includes a pressure relief unit 500, the pressure relief unit 500 is connected to the hot press 100 through a third pipeline 510, and the vacuum sensor 420 is connected to the third pipeline 510.

[0044] In the embodiment, when the pressing is completed, the pressure relief unit 500 is opened, and the ambient air enters the hot press 100 through the third pipeline 510, so that the hot press 100 is relieved. The vacuum sensor 420 is connected with the third pipeline 510 through a pipeline, instead of being arranged on the first pipeline 210 or the second pipeline 310, which can prevent the flowing gas in the first pipeline 210 or the second pipeline 310 from affecting the vacuum sensor 420, and ensure the detection accuracy of the vacuum sensor 420 in the vacuumizing process.

[0045] The third pipeline 510 is connected with a branch pipeline, the branch pipeline is located at the end of the vacuum sensor 420 close to the hot press 100, and the third manual switch 521 is arranged on the branch pipeline. The third manual switch 521 is used to open the third pipeline 510 in the emergency pressure relief.

[0046] Further, the pressure relief unit 500 comprises a third filter 530 and a third stop valve 540 arranged on the third pipeline 510, the third filter 530 is located at the side of the third stop valve 540 away from the hot press 100, and the third stop valve 540 is signal-connected with the controller 410.

[0047] In the embodiment, when the pressing is completed, the controller 410 controls the third stop valve 540 to be opened, so that the air can enter the third pipeline 510 through the third filter 530, and finally enter the hot press 100 through the third pipeline 510. The third filter 530 is used to filter the impurities in the air, so as to avoid the impurities entering the third stop valve 540 and the hot press 100.

[0048] Specifically, the pressure relief unit 500 further comprises a silencer 550, and the silencer 550 is arranged at the end of the third filter 530 away from the third stop valve 540.

[0049] In the embodiment, the air is used to sequentially pass through the third filter 530, the third stop valve 540 and the silencer 550 from the silencer 550 and enter the hot press 100, and the silencer 550 is used to reduce the noise when the hot press 100 is relieved.

[0050] In some embodiments, the nitrogen supply unit 200 comprises a nitrogen generating device 230, the nitrogen generating device 230 is used to generate nitrogen by air, and the nitrogen generating device 230 is connected with the nitrogen filling port 112 through the first pipeline 210. That is, the nitrogen is directly generated by air, which is clean and environmentally friendly.

[0051] In some embodiments, the nitrogen supply unit 200 comprises an oil-water separator 240 and a first filter 250, the inlet end of the oil-water separator 240 is connected with the nitrogen outlet of the nitrogen generating device 230, the outlet end of the oil-water separator 240 is connected with the nitrogen filling port 112 through the first pipeline 210, and the first filter 250 is arranged on the first pipeline 210.

[0052] In the embodiment, the oil-water separator 240 is used to filter the nitrogen gas in the nitrogen generator 230, and the first filter 250 is used to further filter the impurities in the nitrogen gas. The outlet end of the oil-water separator 240 is provided with a second pressure sensor 272 for detecting the pressure of the outlet end of the oil-water separator 240. A first manual switch 281 is arranged between the first filter 250 and the second pressure sensor 272, which is used to manually close the nitrogen supply unit 200 to stop the supply of nitrogen gas when the hot press 100 is overhauled. The nitrogen generator 230 is signal connected with the controller 410, and the start and stop of the nitrogen generator 230 can be controlled through the controller 410.

[0053] In some embodiments, the nitrogen supply unit 200 comprises a pressure reducing valve 260 and a first pressure sensor 271 arranged on the first pipeline 210. The pressure reducing valve 260 is arranged on the side of the first pressure sensor 271 away from the hot press 100. The pressure reducing valve 260 and the first pressure sensor 271 are signal connected with the controller 410, and the controller 410 is used to adjust the opening degree of the pressure reducing valve 260 according to the detected pressure of the first pressure sensor 271.

[0054] In the embodiment, the first pressure sensor 271 is arranged on the side close to the hot press 100, which is used to detect the pressure in the hot press 100. The controller 410 is used to adjust the opening degree of the pressure reducing valve 260 according to the detected pressure of the pressure sensor, so that the nitrogen gas enters the hot press chamber 110 through the nitrogen filling port 112 at an appropriate speed and flow rate, and dilutes the residual air in the hot press chamber 110.

[0055] Specifically, the first valve 220 is arranged on the side of the first pressure sensor 271 close to the hot press 100, which is used to quickly close the nitrogen supply unit 200. A second manual switch 282 is arranged between the nitrogen generator 230 and the oil-water separator 240, which is used to manually close the nitrogen filling port 112.

[0056] In some embodiments, the hot press 100 comprises a heat generating mechanism 120 arranged in the hot press chamber 110.

[0057] In the embodiment, the heat generating mechanism 120 can be an electric heating mechanism or a chemical heat generating mechanism. The heat generating mechanism 120 is arranged in the hot press chamber 110, which is a vacuum environment, used to reduce the heat convection or heat radiation of the heat generating mechanism 120, and further reduce the heat loss.

[0058] The technical features of the above-mentioned embodiments can be combined in any way. In order to make the description simple, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0059] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A hot pressing system, characterized in that, The hot pressing system includes: A hot press (100) has a hot pressing chamber (110), and the hot pressing chamber (110) is provided with a vacuum port (111) and a nitrogen filling port (112), and the vacuum port (111) is located above the nitrogen filling port (112); A nitrogen supply unit (200) is connected to the nitrogen filling port (112) via a first pipeline (210), and a first valve (220) is provided on the first pipeline (210); A vacuum unit (300) is connected to the vacuum port (111) via a second pipe (310), and a second valve (320) is provided on the second pipe (310); and The control unit (400) includes a controller (410), a vacuum sensor (420), and an oxygen content sensor (430). The controller (410) is connected to the vacuum sensor (420), the oxygen content sensor (430), the first valve (220), and the second valve (320) respectively. The vacuum sensor (420) is used to detect the vacuum level inside the hot press (100), and the controller (410) is used to control the first valve (220) to open according to the vacuum level. The oxygen content sensor (430) is used to detect the oxygen content inside the hot press (100), and the controller (410) is used to control the first valve (220) and the second valve (320) to close according to the oxygen content.

2. The hot pressing system according to claim 1, characterized in that, The nitrogen filling port (112) is located on the side of the thermo-pressurized chamber (110) away from the vacuum port (111).

3. The hot pressing system according to claim 1, characterized in that, The oxygen content sensor (430) is connected to the second pipeline (310), and the oxygen content sensor (430) is located on the side of the second valve (320) near the hot press (100).

4. The hot pressing system according to claim 1, characterized in that, The vacuum pumping unit (300) includes a vacuum pump (330) and a second filter (340). The vacuum pump (330) is connected to the vacuum port (111) through the second pipeline (310), and the second filter (340) is disposed on the second pipeline (310).

5. The hot pressing system according to claim 1, characterized in that, The hot pressing system also includes a pressure relief unit (500), which is connected to the hot press (100) via a third pipeline (510), and the vacuum sensor (420) is connected to the third pipeline (510).

6. The hot pressing system according to claim 5, characterized in that, The pressure relief unit (500) includes a third filter (530) and a third shut-off valve (540) disposed on the third pipeline (510). The third filter (530) is located on the side of the third shut-off valve (540) away from the hot press (100). The third shut-off valve (540) is signal-connected to the controller (410).

7. The hot pressing system according to claim 1, characterized in that, The nitrogen supply unit (200) includes a nitrogen generator (230) for generating nitrogen from air. The nitrogen generator (230) is connected to the nitrogen filling port (112) via a first pipeline (210).

8. The hot pressing system according to claim 7, characterized in that, The nitrogen supply unit (200) includes an oil-water separator (240) and a first filter (250). The inlet end of the oil-water separator (240) is connected to the nitrogen outlet of the nitrogen generator (230), and the outlet end of the oil-water separator (240) is connected to the nitrogen filling port (112) through the first pipeline (210). The first filter (250) is installed on the first pipeline (210).

9. The hot pressing system according to any one of claims 1-8, characterized in that, The nitrogen supply unit (200) includes a pressure reducing valve (260) and a first pressure sensor (271) disposed on the first pipeline (210). The pressure reducing valve (260) is disposed on the side of the first pressure sensor (271) away from the hot press (100). The pressure reducing valve (260) and the first pressure sensor (271) are respectively connected to the controller (410). The controller (410) is used to adjust the opening degree of the pressure reducing valve (260) according to the detected pressure of the first pressure sensor (271).

10. The hot pressing system according to claim 1, characterized in that, The hot press (100) includes a heating mechanism (120), which is disposed in the hot pressing chamber (110).

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