CN223328122U - Sealing bag, vacuum assembly and pressing device - Google Patents

Abstract

The present application discloses a sealing bag, a vacuum assembly and a pressing device. The sealing bag includes an inner bag, and a storage space is formed in the inner bag. The storage space is used to place the pre-arrangement board. The inner bag is provided with a liquid suction port and a first vacuum port at intervals. The liquid suction port and the first vacuum port are both connected to the storage space. Before the pre-arrangement board is filled with liquid resin, the sealing bag can be vacuumed to discharge the air in the gaps between the core boards in the pre-arrangement board, thereby avoiding the generation of bubbles when filling with liquid resin. By utilizing the sealing effect of the sealing bag, the liquid resin can also be sucked into the sealing bag by vacuuming, thereby solving the problem of the formation of voids due to the lack of resin filling at positions with smaller spacings; by utilizing the sealing bag's retention effect on the liquid resin, the loss of the liquid resin before being pressed and solidified can be avoided, thereby solving the problem of unstable thickness of the liquid resin in the preset gap, avoiding excessive dielectric thickness, and improving the dielectric thickness uniformity of the PCB board.

Description

Sealing bag, vacuum assembly and pressing device

Technical Field

The application relates to the technical field of circuit board manufacturing, in particular to a sealing bag, a vacuum assembly and a pressing device.

Background

The PCB board is generally required to press the core board and the prepreg, and in the press process, the resin in the prepreg is softened after being heated at a high temperature to reduce the viscosity, and then flows and fills the hollow area. The resin filling is small at the positions where the residual copper rate (area of copper/total area of region) is large after the core etching, and the resin filling is large at the positions where the residual copper rate is small, which leads to the thinning of the dielectric thickness. When the copper thickness of the core is thicker (e.g., up to 3 OZ), the greater the copper thickness of the core, the greater the open volume that the resin needs to fill, thus resulting in a thinner dielectric thickness, at comparable copper residue rates. This may not only lead to reduced dielectric thickness uniformity, but also to too thin dielectric thickness affecting the reliability index of the PCB finished product such as impedance, insertion loss, withstand voltage, etc.

In the related art, in order to make the thickness of the PCB more uniform, a method of coating resin in the gaps of the surface pattern of the core plate and then vacuumizing and curing is generally adopted. However, this solution has at least the problem that for some closed small pitch positions, the air bubbles in the small gaps are easily covered by the resin when the resin is roll coated and do not escape easily, which results in voids being formed during lamination, which has an impact on reliability. For this reason, there is a need for an auxiliary tool that seals the pre-assembled core panel to facilitate vacuum evacuation of the core panel prior to or during resin filling and to retain the resin and avoid run-off prior to resin curing.

Disclosure of utility model

In order to solve at least one of the above technical problems, the application provides a sealing bag, a vacuum assembly and a pressing device, wherein the sealing bag can be used for filling liquid resin into gaps of a pre-arranged plate and sealing and maintaining the liquid resin before curing the liquid resin, so that the uniformity of thickness of a core plate after pressing is improved.

In a first aspect, the sealed bag provided by the application comprises an inner bag, wherein a containing space is formed in the inner bag, the containing space is used for containing a pre-arranged plate, a liquid suction port and a first vacuumizing port are arranged on the inner bag at intervals, and the liquid suction port and the first vacuumizing port are both communicated with the containing space.

In certain embodiments of the first aspect of the present application, the first vacuum port is provided with a first elastic bushing, the first elastic bushing being configured to receive a pre-displacement plate when expanded, and configured to seal the first vacuum port when contracted.

In certain embodiments of the first aspect of the present application, the first elastic bushing is a conical sleeve, and an opening at one end of a conical tip of the conical sleeve is connected to the first vacuumizing port.

In certain embodiments of the first aspect of the present application, the sealed bag further includes an outer bag, the outer bag is sleeved on the outer periphery of the inner bag, a first opening is provided in the outer bag corresponding to the position of the liquid suction opening, the liquid suction opening is exposed from the first opening, the outer periphery of the liquid suction opening is in sealed connection with the first opening, a second opening is provided in the outer bag corresponding to the first vacuumizing opening, the first vacuumizing opening is exposed from the second opening, the outer periphery of the first vacuumizing opening is in sealed connection with the second opening, a second vacuumizing opening is further provided in the outer bag, and the first opening, the second opening and the second vacuumizing opening are arranged at intervals.

In certain embodiments of the first aspect of the present application, the inner bag further includes a rigid connector connected to the liquid suction port, the first opening is provided with a flexible sleeve, the flexible sleeve is sleeved on the periphery of the rigid connector, the rigid connector is exposed from the flexible sleeve, and the flexible sleeve is connected with the rigid connector in a sealing manner.

In certain embodiments of the first aspect of the present application, the second opening is provided with a second elastic sleeve, the second elastic sleeve being adapted to be placed in or taken out of the inner bag when opened, and adapted to be sealingly connected to the first evacuation port when contracted.

In certain embodiments of the first aspect of the present application, the first vacuum port is provided with a first elastic bushing, the first elastic bushing being configured to be placed in the pre-row plate when opened, and configured to seal the first vacuum port when contracted;

The second elastic bushing is a conical sleeve, an opening at one end of the conical top of the conical sleeve is connected to the second opening, when the outer bag is sleeved with the inner bag, the second elastic bushing is sleeved on the periphery of the first elastic bushing, and when the second elastic bushing contracts, the second elastic bushing can be in sealing connection with the first elastic bushing.

In certain embodiments of the first aspect of the present application, the inner bag and the outer bag are both configured as a cubic bag, the liquid suction port and the first vacuum port are respectively disposed on the top corners of the inner bag, and the second vacuum port is disposed on the top corners of the outer bag.

In a second aspect, the present application further provides a vacuum assembly, including a pressure container, a liquid storage tank, and a sealing bag of the first aspect, where the pressure container is used to accommodate the sealing bag, a third opening is provided in the pressure container, the liquid suction port is exposed from the third opening, the liquid suction port is communicated with the liquid storage tank, the pressure container is further provided with a fourth opening for exposing the first vacuumizing port, and a fifth opening for exposing the second vacuumizing port, and the pressure container is provided with a third vacuumizing port for vacuumizing the pressure container, and the third vacuumizing port is spaced from the third opening, the fourth opening, and the fifth opening.

In a third aspect, the present application further provides a pressing device, including a press and the sealing bag of the first aspect, where a sealing cabin is formed in the press, and the sealing cabin is used for performing heating, pressurizing and pressing on the sealing bag.

The embodiment of the application has the advantages that the pre-row plates can be sealed in the accommodating space by utilizing the sealing bag to accommodate the pre-row plates, and firstly, the sealing bag can be vacuumized before the pre-row plates are filled with liquid resin, so that air in each core plate gap in the pre-row plates is discharged, bubbles or bulges can be avoided when the liquid resin is filled, and the filling quality of the liquid resin is improved. Secondly, by utilizing the sealing effect of the sealing bag, liquid resin can be sucked into the sealing bag through vacuumizing, the liquid resin is filled into the gaps of the core plates by utilizing the fluidity of the resin under the action of negative pressure, the problem that the gaps are formed by filling the resin at the positions with smaller spacing is solved, the filling effect of the resin is improved, and the thickness of the laminated core plates is more uniform. Finally, by utilizing the retaining effect of the sealing bag on the liquid resin, the liquid resin can be prevented from losing before being pressed and solidified, so that the problem that the thickness of the liquid resin in a preset gap is unstable is solved, the problem that the thickness is too thin at the part with small residual copper rate is avoided, and the thickness uniformity of the PCB is improved.

Drawings

The described and/or additional aspects and advantages of embodiments of the present application will become apparent and readily appreciated from the following description taken in conjunction with the accompanying drawings. It should be noted that the embodiments shown in the drawings below are exemplary only and are not to be construed as limiting the application.

FIG. 1 is a schematic view of a sealed bag according to an embodiment of the present application;

FIG. 2 is a schematic view of the inner bag and the outer bag of the sealed bag according to the embodiment of the present application;

FIG. 3 is a schematic view of a first example of a vacuum assembly according to an embodiment of the present application;

FIG. 4 is a schematic view of a second example of a vacuum assembly according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a pressing device according to an embodiment of the present application.

Reference numerals 100, sealed bags, 10, inner bags, 11, accommodating spaces, 12, liquid suction ports, 13, a first vacuumizing port, 131, a first elastic bushing, 14, a rigid joint, 20, an outer bag, 21, a first opening, 211, a flexible sleeve port, 22, a second opening, 221, a second elastic bushing, 23, a second vacuumizing port, 30, a vacuum assembly, 31, a pressure container, 311, a third opening, 312, a fourth opening, 313, a fifth opening, 314, a third vacuumizing port, 32, a liquid storage tank, 33, vacuumizing equipment, 34, a buffer device, 35, an electric valve, 36, a liquid level measuring instrument, 37, a controller, 200, a pressing device, 201, a press, 2011, a sealed cabin, 202, a pressurizing pump, 203, a heating device, 204, a pumping device and 300, a core plate.

Detailed Description

Embodiments of the present application are described in detail below with reference to fig. 1 through 5, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

In the description of the present application, it should be understood that, if the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are used as directions or positional relationships based on the directions shown in the drawings, the directions are merely for convenience of description and for simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present application. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

In the related art, in order to make the dielectric thickness of the PCB more uniform, it is generally adopted to coat resin in the pattern gaps on the surface of the core board first, and then press-fit and cure the core board. This can have several problems, one is that for some closed small pitch positions, the air bubbles in the small gaps are easily covered by the resin when the resin is roll coated and are not easily escaped, which can lead to voids being formed during lamination, which can have an impact on reliability. In addition, the mode of coating liquid resin and then overlapping the core plates firstly can lead to unstable coating thickness due to the flowability of the liquid resin, the liquid resin can run off before solidification, the thickness is easy to exceed a tolerance range, the problem of uneven thickness is difficult to solve, the thickness is also difficult to meet the design requirement, and the performance of a PCB product is difficult to ensure.

Based on the above, the application provides a sealing bag suitable for a PCB manufacturing method for sealing a pre-arranged core board and filling liquid resin, wherein the sealing of the pre-arranged core board and the filling of the liquid resin concretely comprise the steps of firstly pre-arranging the core boards according to the stacking sequence of the PCB design, then placing the pre-arranged core boards into the sealing bag for sealing, vacuumizing the sealing bag, thereby sucking the liquid resin into the sealing bag by utilizing the negative pressure effect and filling the liquid resin into a gap of the core boards, and finally pressing the sealing bag filled with the core boards at high temperature and high pressure, so that the liquid resin is solidified to realize the pressing of the core boards. In the process, the sealing bag can realize the PCB manufacturing method, so that the thickness uniformity of the PCB is improved.

Therefore, referring to fig. 1, a first aspect of the present application provides a sealed bag 100, which includes an inner bag 10, wherein a containing space 11 is formed in the inner bag 10, the containing space 11 is used for placing a pre-drainage plate, a liquid suction port 12 and a first vacuum suction port 13 are arranged on the inner bag 10 at intervals, and the liquid suction port 12 and the first vacuum suction port 13 are both communicated with the containing space 11. The pre-row plates (pre-arranged core plates 300) can be sealed in the accommodating space 11 by using the sealing bag 100, and firstly, before filling the pre-row plates with the liquid resin, the sealing bag 100 can be vacuumized, so that air in the gaps of the core plates 300 in the pre-row plates is discharged, bubbles or bulges can be avoided when filling the liquid resin, and the filling quality of the liquid resin is improved. Secondly, by utilizing the sealing effect of the sealing bag 100, liquid resin can be sucked into the sealing bag 100 by vacuumizing, and the liquid resin is filled into the gaps of the core plates 300 by utilizing the fluidity of the resin under the action of negative pressure, so that the problem that voids are formed because the resin cannot be filled at the positions with smaller spacing is solved, the filling effect of the resin is improved, and the thickness of the laminated core plates 300 is more uniform. Finally, by utilizing the retaining effect of the sealing bag 100 on the liquid resin, the liquid resin can be prevented from running off before being pressed and solidified, so that the problem that the thickness of the liquid resin in a preset gap is unstable is solved, the problem that the thickness is too thin at the part with small residual copper rate is avoided, and the thickness uniformity of the PCB is improved.

Alternatively, the inner bag 10 of the sealing bag 100 may be provided with an opening through which the pre-discharge plate is placed into the accommodating space 11, and the opening may be elastically folded by itself or bound, capped, adhered, etc. by other auxiliary structures to thereby seal the inner bag 10. Or the first vacuumizing hole 13 is used for placing the pre-discharging plate, that is, the first vacuumizing hole 13 can be used for vacuumizing the inner bag 10 and can be used as an inlet for placing the pre-discharging plate, so that the number of openings in the sealed bag 100 can be reduced, and the sealing effect of the sealed bag 100 is improved.

Specifically, in some embodiments, the first vacuum port 13 is provided with a first elastic bushing 131, and the first elastic bushing 131 can be used for placing the pre-row plate when being opened, and can be used for sealing the first vacuum port 13 when the first elastic bushing 131 is contracted. By utilizing the self-elastic action of the first elastic bushing 131, on one hand, the first vacuumizing port 13 can be opened to a size allowing the pre-arranged plate to pass through, and the first vacuumizing port 13 is closed by being folded under the self-elastic action. On the other hand, the first elastic bushing 131 can also realize sealing in a binding manner, and the first elastic bushing 131 can increase the connection area of the inner bag 10 and the vacuumizing pipe or joint of the vacuumizing device 33, so that the sealing performance of the inner bag 10 and the vacuumizing device 33 is improved, and the vacuumizing effect of the inner bag 10 is improved.

In some embodiments, the first elastic bushing 131 is a conical sleeve, and an opening at one end of a conical tip of the conical sleeve is connected to the first vacuum suction port 13. The taper sleeve has opposite ends, and wherein the opening size of the cone top end is less than the opening size of the cone bottom end, through setting the first elastic bushing 131 as the taper sleeve, on the one hand, the opening of the cone top end is less, through being connected with the first vacuum pumping mouth 13 with the cone top end, can reduce the opening size of the first vacuum pumping mouth 13, improves the sealed effect of the first vacuum pumping mouth 13. On the other hand, the opening at one end of the cone bottom is larger, so that the cone bottom is beneficial to being opened when the pre-arranged plates are placed, the pre-arranged plates are guided to be placed into the accommodating space 11, and the convenience of operation is improved.

After the sealing bag 100 is pressed with the pre-row board, the liquid resin filled in the sealing bag 100 is adhered to the sealing bag 100 after being solidified, so that the sealing bag 100 needs to be destroyed after the pre-row board is pressed and formed into the PCB, and the PCB can be taken out. In order to enable recycling of the sealed bag 100, the sealed bag 100 may be used in combination of the inner bag 10 and the outer bag 20.

Therefore, in some embodiments, referring to fig. 2, the sealed bag 100 further includes an outer bag 20, the outer bag 20 is sleeved on the outer periphery of the inner bag 10, a first opening 21 is provided at a position corresponding to the liquid suction port 12 of the outer bag 20, the liquid suction port 12 is exposed from the first opening 21, the outer periphery of the liquid suction port 12 is in sealing connection with the first opening 21, the outer bag 20 is provided with a second opening 22 corresponding to the first vacuumizing port 13, the first vacuumizing port 13 is exposed from the second opening 22, the outer periphery of the first vacuumizing port 13 is in sealing connection with the second opening 22, the outer bag 20 is further provided with a second vacuumizing port 23, and the first opening 21, the second opening 22 and the second vacuumizing port 23 are arranged at intervals. By combining the inner bag 10 and the outer bag 20 with the sealed bag 100, on the one hand, the outer bag 20 can be removed before the pre-arranging plate is pressed, and only the inner bag 10 with the pre-arranging plate is pressed, the outer bag 20 can be recycled, after the pre-arranging plate is pressed, the liquid resin filled in the inner bag 10 is solidified and adhered to the inner bag 10, and the inner bag 10 can be removed by edge milling or the like, and recycling of the outer bag 20 is not affected (of course, in other examples, the outer bag 20 can be pressed together, and the inner bag 10 and the outer bag 20 are separated after the pressing is finished, and the outer bag 20 is recycled). On the other hand, by providing a two-layer bag structure, the sealing performance of the sealed bag 100 can be further improved, and by making the air pressure in the inner bag 10 reach a preset value, it is possible to ensure a good vacuum degree in the inner bag 10 before filling the liquid resin, and to avoid the occurrence of voids or bubbles in the liquid resin during filling of the residual air in the gap of the core plate 300. The outer bag 20 can be vacuumized by using the second vacuumizing port 23, and illustratively, when the sealed bag 100 is vacuumized, the outer bag 20 is vacuumized first and then the inner bag 10 is vacuumized, so that the accommodating space 11 in the inner bag 10 can have a good vacuum degree. When the inner bag 10 needs to be separated from the outer bag 20, the outer bag 20 can be inflated by using the second vacuumizing port 23, the fit between the inner bag 10 and the outer bag 20 is released, and the second opening 22 is opened to take out the inner bag 10 from the outer bag 20.

Illustratively, the inner bag 10 may be a film material having sealing and high temperature resistance properties, which ensures that the structure and sealability of the inner bag 10 are not compromised when the inner bag 10 is placed into the press 201 for pressing. The inner bag 10 may be made of a material that does not react with the resin. The outer bag 20 may be made of a flexible material, and the outer bag 20 is capable of carrying the weight of the plurality of core plates 300. Alternatively, the thickness of the outer bag 20 may be greater than the thickness of the inner bag 10.

By providing the first opening 21 and the second opening 22 to the outer bag 20, the liquid suction port 12 and the first vacuum suction port 13 of the inner bag 10 can be easily exposed from the outer bag 20, so that the inner bag 10 can be vacuumized and the liquid resin can be sucked. It will be appreciated that the portions of the inner bag 10 extending from the first and second openings 21, 22 of the outer bag 20 need to be sealingly connected to each other with the outer bag 20 to ensure a sealing effect when the outer bag 20 is evacuated.

In some embodiments, the inner bag 10 further comprises a rigid connector 14 connected to the liquid absorbing port 12, the first opening 21 is provided with a flexible sleeve opening 211, the flexible sleeve opening 211 is sleeved on the periphery of the rigid connector 14, the rigid connector 14 is exposed from the flexible sleeve opening 211, and the flexible sleeve opening 211 is in sealing connection with the rigid connector 14. With the rigid connection 14 connected to the liquid suction port 12, further, the rigid connection 14 may be connected to a liquid reservoir 32 storing liquid resin through a pipe to suck the liquid resin into the inner bag 10. The rigid joint 14 can ensure that the inner walls of the liquid suction port 12 are not adhered to each other under the negative pressure of the vacuum suction of the inner bag 10, thereby ensuring the smoothness of the liquid suction port 12. Illustratively, the rigid joint 14 may be a hard pipe capable of maintaining the rigidity of the pipe wall under negative pressure to ensure the pipe is clear. By using the flexible sleeve 211 of the outer bag 20, on one hand, the rigid joint 14 can be exposed to ensure that the inner bag 10 can be connected with the external liquid resin liquid storage tank 32 through the liquid suction port 12, and on the other hand, the flexible sleeve 211 can be in sealing connection with the outer periphery of the rigid joint 14 by utilizing the self-flexibility or elasticity, so that the sealing property between the first opening 21 of the outer bag 20 and the liquid suction port 12 of the inner bag 10 is improved. Optionally, the flexible cuffs 211 may further improve the seal with the rigid joints 14 by strapping.

In some embodiments, the second opening 22 is provided with a second elastic bushing 221, the second elastic bushing 221 being adapted to be placed in or out of the inner bag 10 when opened, and the second elastic bushing 221 being adapted to be sealingly connected to the first vacuum-evacuation port 13 when contracted. By the self-elastic action of the second elastic bushing 221, on the one hand, the second opening 22 can be opened to a size through which the inner bag 10 can pass, and the second opening 22 can be closed by folding under the self-elastic action. On the other hand, the second elastic bushing 221 can increase the contact area with the first elastic bushing 131, improving the sealing effect between the first vacuum suction port 13 and the second opening 22. Alternatively, the tightness between the second elastic bushing 221 and the first elastic bushing 131 may be further improved by means of banding.

In some embodiments, the second elastic bushing 221 is also configured as a conical sleeve, the opening at the top end of the conical sleeve is connected to the second opening 22, when the outer bag 20 is sleeved with the inner bag 10, the second elastic bushing 221 is sleeved on the outer periphery of the first elastic bushing 131, and when the second elastic bushing 221 is contracted, the second elastic bushing 221 can be in sealing connection with the first elastic bushing 131. By arranging the second elastic bushing 221 as a conical sleeve, on one hand, the connection of one end of the conical top with the second opening 22 can be satisfied to reduce the opening size of the second opening 22 and improve the sealing effect, and on the other hand, the opening of one end of the conical bottom can be satisfied to be large enough to facilitate taking and placing of the inner bag 10, and on the other hand, the second elastic bushing 221 and the first elastic bushing 131 are arranged in the same shape, so that the two are more attached when being mutually sealed, and the sealing effect between the second opening 22 and the first vacuumizing opening 13 is improved.

In some embodiments, the inner bag 10 and the outer bag 20 are each configured as a cubic bag, the liquid suction port 12 and the first vacuum port 13 are respectively disposed on the top corners of the inner bag 10, and the second vacuum port 23 is disposed on the top corners of the outer bag 20. Since the shape of the core plate 300 is generally rectangular, the pre-row plates formed after stacking the plurality of core plates 300 are in a cubic shape, so that the inner bag 10 and the outer bag 20 are also arranged as cubic bags, the fitting degree of the sealing bag 100 and the pre-row plates can be improved, the profile of the sealing bag 100 provided with the pre-row plates is more regular, the plurality of sealing bags 100 can be conveniently and compactly discharged and simultaneously pressed, the occupied space of each sealing bag 100 is reduced, and the manufacturing efficiency of the PCB is improved. It will be appreciated that the inner and outer pockets 10, 20 may be flexibly selected to accommodate the size according to the actual specifications of the core plate 300, and the specific dimensions of the inner and outer pockets 10, 20 are not limited herein.

In a second aspect, referring to fig. 3 and 4, the present application further provides a vacuum assembly 30, including a pressure container 31, a liquid storage tank 32, and the sealed bag 100 provided in the first aspect, where the pressure container 31 is used for accommodating the sealed bag 100, a third opening 311 is provided in the pressure container 31, the liquid suction port 12 is exposed from the third opening 311, the liquid suction port 12 is communicated with the liquid storage tank 32, the pressure container 31 is further provided with a fourth opening 312 for exposing the first vacuum suction port 13, and a fifth opening 313 for exposing the second vacuum suction port 23, the pressure container 31 is provided with a third vacuum suction port 314 for evacuating the interior of the pressure container 31, and the third vacuum suction port 314 is spaced from the third opening 311, the fourth opening 312, and the fifth opening 313. The liquid resin can be stored by using the liquid storage tank 32, the liquid storage tank 32 can be connected with the liquid suction port 12 of the inner bag 10 through a pipeline, and the liquid resin can enter the inner bag 10 and be filled into the gaps of the core plates 300 of the pre-row plates in the process of vacuumizing the inner bag 10. By using the pressure container 31, the pressure container 31 has certain rigidity, on one hand, the sealing bag 100 can be supported and fixed in the vacuumizing process, and the stability of the sealing bag 100 in the vacuumizing process is improved, and on the other hand, the pressure container 31 can be vacuumized, so that the sealing bag 100 can be attached to the inner wall of the pressure container 31, and enough space is provided for the flow of liquid resin in the sealing bag 100, and the filling effect of the liquid resin is improved. On this basis, the sealing bag 100 (including the inner bag 10 and the outer bag 20) may be provided as a flexible bag, and the flexible sealing bag 100 has a certain deformability, can help to adapt to the shape of the core plate 300, and in a state that the flexible sealing bag 100 is vacuumized, the flexible sealing bag 100 can be attached to the outer surface of the core plate 300, so that the liquid resin filled in the gap of the core plate 300 can be better maintained, and the liquid resin is further prevented from running off from the gap before being solidified.

In some embodiments, vacuum assembly 30 further comprises a vacuum apparatus 33, an electrically operated valve 35, a level gauge 36, and a controller 37, electrically operated valve 35 being connected to the liquid suction port 12 of the inner bag 10, electrically operated valve 35 being configured to open to allow liquid resin to enter the inner bag 10 or to close to block the flow of liquid resin into the inner bag 10. The liquid level gauge 36 may be used to detect the vacuum level in the inner bag 10, and when the vacuum level in the inner bag 10 reaches a preset value, the electric valve 35 is opened, so that it can be ensured that the inner bag 10 has enough vacuum level before the liquid resin enters the inner bag 10, and the residual air in the inner bag 10 is prevented from generating bubbles when the liquid resin is filled, so that it is ensured that the liquid resin can achieve a good filling effect.

Alternatively, both the level gauge 36 and the electric valve 35 are electrically connected to the controller 37, and the controller 37 detects the vacuum degree of the inner bag 10 using the level gauge 36, and when the air pressure in the inner bag 10 is higher than a preset value, the electric valve 35 is maintained in a closed state, and the liquid resin cannot enter the inner bag 10. The inner bag 10 is evacuated until the vacuum degree in the inner bag 10 is detected to reach a preset value, at which time the controller 37 controls the electric valve 35 to be opened, thereby sucking liquid resin into the inner bag 10 by the evacuating device 33 to fill the gap of the sub-boards. Illustratively, a conductive liquid (e.g., mercury) may be disposed in the level gauge 36, and a change in the level of the conductive liquid can produce different electrical signals to enable detection of the vacuum level of the inner bag 10.

Optionally, a buffer device 34 may be further provided between the evacuation device 33 and the first evacuation port 13 of the inner bag 10, the buffer device 34 being used for storing liquid resin waste material that is evacuated from the inner bag 10, and the resin volatiles being able to be discharged after condensation.

In a third aspect, referring to fig. 5, the present application further provides a pressing device 200, where the pressing device 200 includes a press 201 and the sealing bag 100 provided in the first aspect, a sealing cabin 2011 is formed in the press 201, and the sealing cabin 2011 is used for heating, pressing and pressing the sealing bag 100. By utilizing the sealed cabin 2011, the cabin can be pressurized and heated, so that the core plates 300 can be mutually pressed under the action of high temperature and high pressure to form a PCB finished product. Illustratively, the press 201 may be a cabin press 201, the cabin press 201 having a sealed cabin 2011 configuration.

In some embodiments, the press 201 may be purged with an inert gas during operation, which does not react with the core plate 300, resin, etc. The inert gas can be pressurized and heated by the pressurizing pump 202 and the heating device 203, and is introduced into the cabin pressure type press 201 after reaching the set pressure and temperature, so that the pressing effect of the pre-arranged plates can be further improved in a high-temperature and high-pressure environment.

Optionally, with continued reference to fig. 5, the arrow in fig. 5 shows the flow direction of the inert gas of the high-temperature and high-pressure gas, and the inert gas may be introduced through the top, bottom, peripheral side, etc. of the cabin pressure press 201 to form a surrounding air flow for the sealing bag 100 and the pre-row board placed in the cabin pressure press 201, so that the pre-row board is heated and pressed more uniformly during the pressing process, thereby improving the pressing quality of the pre-row board. The cabin pressure press 201 may also be provided with an air extraction device 204 connected to the cabin for extracting inert gas to control the air pressure in the cabin.

In some embodiments, the pressing device 200 may further be provided with a buffer device 34 connected to the sealing bag 100, where the buffer device 34 has a liquid storage function, and when the sealing bag 100 is vacuumized before or during pressing, waste liquid formed after the volatile gas in the sealing bag 100 is cooled and an overflow portion of the resin in the sealing bag 100 after being heated and expanded can be discharged into the buffer device 34, so that the influence of the volatile gas and the overflowed resin on the pressing quality of the pre-discharge plate is avoided, and the pressing effect of the pre-discharge plate is further improved.

In the description of the present specification, if a description appears that makes reference to the term "one embodiment," "some examples," "some embodiments," "an exemplary embodiment," "an example," "a particular example," or "some examples," etc., it is intended that the particular feature, structure, material, or characteristic described in connection with the embodiment or example be included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present application.

In the description of the present application, the terms "and" if used in the singular are intended to mean "and" as opposed to "or". For example, patent name "one A, B" describes that the claimed application is a technical solution with a subject name a and a technical solution with a subject name B.

Claims (10)

1. A sealing bag is characterized by comprising

The inner bag, be formed with the accommodation space in the inner bag, the accommodation space is used for placing the board of arranging in advance, the interval is provided with liquid suction mouth and first evacuating mouth on the inner bag, liquid suction mouth with first evacuating mouth all communicate in the accommodation space.

2. The sealed bag of claim 1, wherein said first vacuum port is provided with a first elastomeric bushing, said first elastomeric bushing being adapted to receive a pre-evacuation plate when expanded and adapted to seal said first vacuum port when contracted.

3. The sealed bag according to claim 2, wherein said first elastic bushing is a conical sleeve, and an opening at one end of a conical tip of said conical sleeve is connected to said first vacuum suction port.

4. The sealed bag of claim 1, wherein the sealed bag further comprises an outer bag, the outer bag is sleeved on the periphery of the inner bag, a first opening is formed in the outer bag corresponding to the liquid suction opening, the liquid suction opening is exposed out of the first opening, the periphery of the liquid suction opening is in sealing connection with the first opening, a second opening is formed in the outer bag corresponding to the first vacuumizing opening, the first vacuumizing opening is exposed out of the second opening, the periphery of the first vacuumizing opening is in sealing connection with the second opening, a second vacuumizing opening is further formed in the outer bag, and the first opening, the second opening and the second vacuumizing opening are arranged at intervals.

5. The sealed bag of claim 4, wherein said inner bag further comprises a rigid connector connected to said liquid suction port, said first opening is provided with a flexible cuff, said flexible cuff is sleeved on the outer periphery of said rigid connector, said rigid connector is exposed from said flexible cuff, and said flexible cuff is in sealing connection with said rigid connector.

6. The sealed bag of claim 4, wherein said second opening is provided with a second elastomeric bushing, said second elastomeric bushing being adapted to be placed in and out of said inner bag when opened and adapted to be sealingly connected to said first evacuation port when contracted.

7. The sealed bag of claim 6, wherein said first vacuum port is provided with a first elastomeric bushing, said first elastomeric bushing being adapted to receive a pre-evacuation plate when expanded and adapted to seal said first vacuum port when contracted;

The second elastic bushing is a conical sleeve, an opening at one end of the conical top of the conical sleeve is connected to the second opening, when the outer bag is sleeved with the inner bag, the second elastic bushing is sleeved on the periphery of the first elastic bushing, and when the second elastic bushing contracts, the second elastic bushing can be in sealing connection with the first elastic bushing.

8. The sealed bag according to claim 4, wherein the inner bag and the outer bag are both cubic bags, the liquid suction port and the first vacuum suction port are respectively arranged on the top corners of the inner bag, and the second vacuum suction port is arranged on the top corners of the outer bag.

9. A vacuum assembly, which is characterized by comprising a pressure container, a liquid storage tank and a sealing bag according to any one of claims 1 to 8, wherein the pressure container is used for accommodating the sealing bag, a third opening is arranged in the pressure container, a liquid suction opening is exposed from the third opening, the liquid suction opening is communicated with the liquid storage tank, the pressure container is further provided with a fourth opening used for exposing the first vacuumizing opening and a fifth opening used for exposing the second vacuumizing opening, the pressure container is provided with a third vacuumizing opening used for vacuumizing the pressure container, and the third vacuumizing opening is arranged at intervals with the third opening, the fourth opening and the fifth opening.

10. A pressing device, which is characterized by comprising a pressing machine and the sealing bag as claimed in any one of claims 1 to 8, wherein a sealing cabin is formed in the pressing machine and is used for heating, pressing and pressing the sealing bag.