CN111372389B

CN111372389B - Expansion and shrinkage control method for printed circuit board core board

Info

Publication number: CN111372389B
Application number: CN202010161835.0A
Authority: CN
Inventors: 王欣; 周刚; 曾祥福
Original assignee: Guangdong Kexiang Electronic Technology Co ltd
Current assignee: Guangdong Kexiang Electronic Technology Co ltd
Priority date: 2020-03-10
Filing date: 2020-03-10
Publication date: 2021-06-08
Anticipated expiration: 2040-03-10
Also published as: CN111372389A

Abstract

The invention relates to a method for controlling the expansion and shrinkage of a core board of a printed circuit board, which is a method for controlling the expansion and shrinkage of the core board by adopting a layered board baking mode in a baking procedure. The baking process is to place the core plate in the baking device in sequence to bake, the baking device comprises a baking chamber, a baking rack arranged at intervals of multiple layers is arranged in the baking chamber, the baking rack comprises a baking plate and a supporting structure, the supporting structure is arranged in the baking chamber, and the baking plate is arranged on the supporting structure and used for placing and baking the core plate. The method for controlling the expansion and shrinkage of the core board of the printed circuit board has the advantages of stable and uniform baking.

Description

Expansion and shrinkage control method for printed circuit board core board

Technical Field

The invention relates to the technical field of printed circuit boards, in particular to a method for controlling the expansion and contraction of a core board of a printed circuit board.

Background

In the printed circuit board, as the core board is not allowed to be tangent to the concentric circles after being pressed, the core board is baked before being pressed so as to dissipate moisture in the board surface and further cure resin on the board surface. Baking refers to heating and baking the core plates in a baking chamber, a baking frame is generally arranged in the traditional baking chamber, and a plurality of core plates are sequentially stacked on the baking frame. This kind of tradition piles up the mode of toasting in the baking chamber with polylith core board in proper order, and it is easy to appear the phenomenon that each core board toasts the degree and differs in the baking process, and it toasts inhomogeneously.

Disclosure of Invention

The invention provides a method for controlling the expansion and contraction of a printed circuit board core board with stable baking plate and good uniformity.

In order to achieve the above purpose, the following technical solutions are provided.

A method for controlling the expansion and shrinkage of a core board of a printed circuit board is a method for controlling the expansion and shrinkage of the core board in a layered baking mode in a baking procedure. The method for controlling the expansion and shrinkage of the core board of the printed circuit board adopts a layered baking board mode, and adopts a layered baking board, so that the core boards can be placed in a layered mode, the upper part and the lower part of each core board are uniformly heated, the temperature uniformity of the baked core board is good, the stability of the baked board is improved, and the expansion and shrinkage amount of the core boards is reduced.

Further, toast the process and place the core in baking equipment in proper order and toast, baking equipment includes the baking chamber, be equipped with the griddle that the multilayer interval set up in the baking chamber, the griddle includes griddle board and bearing structure, bearing structure installs in the baking chamber, griddle board is installed on bearing structure for place and toast the core, place a core on every layer of griddle board. The setting of the griddle that the multilayer interval set up in the toasting chamber makes polylith core plate place respectively on the baking tray of different layers, ensures at the toasting in-process, and the core plate on each baking tray is heated evenly, makes the interior moisture of board scatter and disappear and the face resin solidification is even, promotes the roast board stability of core plate, and then reduces the harmomegathus volume of core plate.

Furthermore, the baking plate is a circular baking plate, the baking plate is composed of a plurality of groups of circular parts with different sizes, and the circular parts are distributed in a concentric circle shape. Circular baking tray that each circular member that differs in size is the concentric circles form and distributes and constitute, and the back is placed on baking tray to the core, and in toasting the in-process, it is unanimous to be heated from top to bottom, and the homogeneity is good.

Further, each round piece all adopts metal material to make, the cross section of round piece is circular, the circular cross-sectional diameter of round piece is 3mm, and adjacent round piece interval is 5 cm. The adoption is a plurality of circular members made by the metal material and is the circular baking tray that the concentric structure distributes and forms, and metal material heat transfer rate is fast and stable, and each adjacent circular member interval 5 cm's setting makes the distance between each circular member equal, and the even stability of distribution can evenly pass to the core with the heat in the baking chamber on, makes the inboard moisture scatter and disappear, the face resin solidification is even, effectively avoids traditional multilayer to stack the uneven phenomenon of baking that toasts and cause.

Further, the quantity of circular member is 6 at least groups, and the specific quantity of circular member is decided according to the size of the core plate and the size of the size in the baking chamber, sets up 6 at least groups of circular members, effectively ensures that each group of circular member evenly distributed forms stable baking tray, makes the core plate place on baking tray after stable.

Further, the metal material may be any one of stainless steel, copper or aluminum, or may be other common heat-transfer metal materials.

Furthermore, the supporting structure comprises at least two supporting strips which are crossed with each other, and two ends of each supporting strip are respectively connected with the inner wall of the baking chamber. The support bar is arranged and used for supporting the round piece.

Further, the width of support bar is 1cm, and thickness is 1 cm's square support bar, support bar 1cm x 1 cm's square structure, and it is stable in structure not only, and the consumptive material is few moreover, is convenient for install simultaneously.

Furthermore, the inner wall of the baking chamber, which is contacted with the end part of the supporting bar, is provided with a supporting groove matched with the supporting bar, and the supporting groove is used for supporting and fixing the supporting bar, so that the supporting structure is stably arranged in the baking chamber.

Furthermore, the baking temperature in the baking chamber is 160 ℃, the baking time is 4 hours, so that the baking process of the core plate is more stable, the effect is better, and the expansion and shrinkage amount of the core plate during baking is further reduced.

Compared with the prior art, the method for controlling the expansion and shrinkage of the core board of the printed circuit board has the following beneficial effects:

the method for controlling the expansion and shrinkage of the core board of the printed circuit board adopts a layered baking board mode, and adopts a layered baking board, so that the core boards can be placed in a layered mode, the upper part and the lower part of each core board are uniformly heated, the temperature uniformity of the baked core board is good, the stability of the baked board is improved, and the expansion and shrinkage amount of the core boards is reduced.

Drawings

FIG. 1 is a schematic plan view of a baking rack in the method for controlling expansion and contraction of a core board of a printed circuit board according to the present invention;

FIG. 2 is a partial schematic view of a baking chamber with a core board in the method for controlling the expansion and contraction of the core board of the printed circuit board of the present invention.

Detailed Description

The method for controlling the expansion and contraction of the core board of the printed circuit board according to the present invention will be described in further detail with reference to the following embodiments and the accompanying drawings.

Referring to fig. 1 and 2, a method for controlling the expansion and contraction of a core board 30 of a printed circuit board according to a non-limiting embodiment of the present invention is a method for controlling the expansion and contraction of the core board 30 by using a layered baking board in a baking process. The method for controlling the expansion and shrinkage of the core board of the printed circuit board adopts a layered baking board mode, the core boards 30 can be placed in layers by adopting the layered baking board, the upper part and the lower part of each core board 30 are heated uniformly, the temperature uniformity of the baked core boards 30 is good, the stability of the baked core boards is improved, and the expansion and shrinkage amount of the core boards 30 is reduced.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, the core plates 30 are sequentially placed in a baking device for baking, the baking temperature in the baking chamber 10 is 160 ℃, and the baking time is 4 hours, so that the baking process of the core plates 30 is more stable, the effect is better, and the expansion and shrinkage of the core plates 30 during baking are further reduced. The baking device comprises a baking chamber 10, a baking rack 20 with multiple layers arranged at intervals is arranged in the baking chamber 10, the baking rack 20 comprises a baking tray 22 and a supporting structure 21, the supporting structure 21 is installed in the baking chamber 10, the baking tray 22 is installed on the supporting structure 21 and used for placing and baking the core plates 30, and one core plate 30 is placed on each layer of the baking tray 22. The setting of toasting frame 20 that the multilayer interval set up in toasting chamber 10 makes polylith core plate 30 place respectively on the toasting disc 22 of different layers, ensures to toast the in-process, and the core plate 30 on each toasting disc 22 is heated evenly, makes the interior moisture of board scatter and disappear and the face resin solidification is even, promotes the roast board stability of core plate 30, and then reduces the harmomegathus volume of core plate 30.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, the bake plate 22 is a circular bake plate 22, and the bake plate 22 is formed by a plurality of circular members with different sizes, and the circular members are distributed in concentric circles. Circular baking tray 22 that each circular member that differs in size is the concentric circles form and distributes and constitute, and after core 30 placed on baking tray 22, in the baking process, it is unanimous to be heated from top to bottom, and the homogeneity is good.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, each circular member is made of a metal material, the cross section of the circular member is circular, the diameter of the circular section of the circular member is 3mm, and the distance between adjacent circular members is 5 cm. Adopt a plurality of circular members made by the metal material to be the circular baking tray 22 that the concentric structure distributes and form, the metal material heat transfer rate is fast and stable, and the setting of each adjacent circular member interval 5cm makes the distance between each circular member equal, and the distribution is even stable, can evenly pass to the core 30 with baking chamber 10 internal heat on, makes the moisture in the board scatter and disappear, the face resin solidification is even, effectively avoids traditional multilayer to stack the stoving inequality phenomenon that toasts the cause.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, the number of the circular members is at least 6, the specific number of the circular members depends on the size of the core plate 30 and the size of the baking chamber 10, and at least 6 circular members are provided to effectively ensure that the circular members of each group are uniformly distributed to form a stable baking plate 22, so that the core plate 30 is stably placed on the baking plate 22.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, the metal material is any one of a stainless steel material, a copper material and an aluminum material, and may be other common heat-transfer metal materials.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, the support structure 21 includes at least two support bars crossing each other, and both ends of the support bars are respectively connected to the inner wall of the oven chamber 10. The support bar is arranged and used for supporting the round piece. The width of support bar is 1cm, and thickness is 1 cm's square support bar, support bar 1cm x 1 cm's square structure, and it is stable in structure not only, and the consumptive material is few moreover, is convenient for install simultaneously. The inner wall of the baking chamber 10 contacted with the end part of the supporting bar is provided with a supporting groove matched with the supporting bar, and the supporting groove is used for supporting and fixing the supporting bar, so that the supporting structure 21 is stably arranged in the baking chamber 10.

In the description of the present invention, it is to be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate orientations or positional relationships, are used based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and for the simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The above embodiments are only specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.

Claims

1. A method for controlling the expansion and shrinkage of a core board of a printed circuit board is characterized in that: the control method is for adopting the mode of the roast board of layering to carry out the method of controlling the harmomegathus of core in toasting the process, toast the process and toast for placing the core in baking equipment in proper order, baking equipment includes the baking chamber, be equipped with the carriage that the multilayer interval set up in the baking chamber, carriage is including toasting dish and bearing structure, bearing structure installs in the baking chamber, bearing structure includes two at least intercrossing's support bar, the both ends of support bar respectively with bake the indoor wall connection of chamber, toast the dish and install on bearing structure for place and toast the core, it toasts the dish for circular, it comprises the circular member that the multiunit size differs to toast the dish, and each circular member is concentric circle form distribution.

2. The method of claim 1, wherein each circular member is made of a metal material, the circular member has a circular cross-section, the circular cross-section has a diameter of 3mm, and the adjacent circular members are spaced apart by 5 cm.

3. The printed circuit board core expansion and contraction control method according to claim 2, wherein the number of the circular members is at least 6 groups.

4. The method of claim 3, wherein the metal material is any one of stainless steel, copper or aluminum.

5. The method of claim 4, wherein the support bar has a width of 1cm and a thickness of 1 cm.

6. The method of controlling expansion and contraction of a printed circuit board core as claimed in any one of claims 1 to 5, wherein the inner wall of the baking chamber contacting the end of the supporting bar is provided with a supporting groove for fitting with the supporting bar.

7. The method of claim 6, wherein the baking temperature in the baking chamber is 160 ℃ and the baking time is 4 hours.