Heating plate for improving water streak defects of prepreg

Abstract

The utility model discloses a heating plate for improving water flow pattern defects of a prepreg, comprising a first heating plate and a second heating plate, wherein the first heating plate and the second heating plate are both provided with a clearance opening for exposing the prepreg and an air outlet for letting gas flow out, and the first heating plate and the second heating plate are arranged relatively to each other up and down to enclose and form a mounting position for accommodating the prepreg; the air outlet of the first heating plate is vertically connected to the air outlet of the second heating plate; through the structural design and coordination of the first heating plate and the second heating plate, the air outlet is used to compress air, so that the edge portion of the prepreg located in the mounting position is in a suspended state, so that the curing degree of the edge portion of the prepreg is higher than that of the center; the curing degree of the prepreg is effectively controlled, so that the fluidity of the prepreg during the lamination process is retained, so as to avoid water flow patterns and improve the thickness uniformity and consistency of the plate at various locations.

Description

Technical Field

[0001] The utility model relates to the field technology of prepreg processing, in particular to a heating plate for improving water flow pattern defects of prepreg. Background Art

[0002] As terminal electronic products develop in the direction of "light", "small", "thin" and "fast", circuit boards are constantly developing towards line density and interlayer thinning. Therefore, more stringent control requirements are put forward for the impedance characteristics and reliability of transmission lines, the assembly and processing accuracy of components, and thus the requirements for the thickness accuracy of the substrate insulation layer are becoming more and more stringent. As the substrate material of the circuit board, the thickness accuracy of the circuit board mainly depends on the thickness uniformity of the copper clad laminate.

[0003] The existing copper clad laminate preparation method mainly includes the following steps: (1) take at least one prepreg and laminate copper foil on one or both sides of it; (2) place it between the upper and lower heating plates of a laminator and laminate it under high temperature and high pressure; the copper clad laminate can be obtained; the lamination process generally includes a melting stage, a curing stage and a cooling stage. In the melting stage of the prepreg lamination process, the impregnated glue will gather at the edge of the glass fiber cloth under the action of high temperature and high pressure to form a glue flow phenomenon;

[0004] The prior art discloses a manufacturing method for improving the thickness uniformity of copper clad laminates, which mainly adopts prepregs with different resin curing degrees in the middle and at the edges, thereby improving the problem of glue flow during the lamination process of the copper clad laminates, and the curing degree of the resin in the edge areas around the prepregs is increased from the original 40% to 60% to 60% to 80%; this scheme can improve the glue flow problem of the copper clad laminates, but it is difficult to produce such special prepregs using the current existing manufacturing equipment. If a heating device is used to cure the edge of the prepreg during the shearing process of the rolled prepreg, and the periphery of the entire prepreg cannot be cured, and a large amount of fillers are added to the formula to improve the performance, this will also cause 5-10 cm resin lines (water flow lines) to appear on the edge of the board under subsequent high-temperature pressing due to the different fluidity of the filler and the resin.

[0005] Therefore, it is necessary to study a new technical solution to solve the above problems. Utility Model Content

[0006] In view of this, the utility model aims to improve the deficiencies of the prior art, and its main purpose is to provide a heating plate for improving the water flow mark defects of semi-cured sheets. Through the structural design and coordination of the first heating plate and the second heating plate, it effectively solves the problem of resin lines (water flow marks) appearing on the edge of the plate under high-temperature pressing conditions, thereby causing uneven and inconsistent thickness of the plate.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A heating plate for improving water flow defects of a prepreg, comprising a first heating plate and a second heating plate, both of which have a clearance opening for exposing the prepreg and an air outlet for gas to flow out, the first heating plate and the second heating plate are arranged opposite to each other up and down to enclose and form a mounting position for accommodating the prepreg; the air outlet of the first heating plate passes through the air outlet of the second heating plate up and down.

[0009] As a preferred embodiment, the first heating plate and the second heating plate each include a first transverse edge, a second transverse edge, a first vertical edge and a second vertical edge, one end of the first transverse edge is connected to one end of the first vertical edge, and the other end of the first transverse edge is connected to one end of the second vertical edge; the second transverse edge is connected to the other end of the first vertical edge, and the second transverse edge is connected to the other end of the second vertical edge to form a clearance opening.

[0010] As a preferred solution, the first transverse edge, second transverse edge, first vertical edge and second vertical edge of the first heating plate are arranged vertically opposite to the first transverse edge, second transverse edge, first vertical edge and second vertical edge of the second heating plate and enclose to form an installation position.

[0011] As a preferred solution, the plurality of air outlet holes are arranged at intervals on the corresponding first transverse edge, the second transverse edge, the first vertical edge and the second vertical edge in sequence; the plurality of air outlet holes respectively penetrate the upper and lower surfaces of the corresponding first transverse edge, the second transverse edge, the first vertical edge and the second vertical edge.

[0012] As a preferred solution, the diameter of the air outlet hole is 0.001mm-100mm.

[0013] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it mainly adopts the structural design and coordination of the first heating plate and the second heating plate. During the lamination process, the installation position is used to provide a holding space for the semi-cured sheet, and the first heating plate and the second heating plate are heated and baked around by light radiation. The air outlet is used to compress the air, and the upper and lower gas flow ratios of the first heating plate and the second heating plate are controlled to be 1:3, so that the edge portion of the semi-cured sheet located in the installation position is in a suspended state, so that the edge portion of the semi-cured sheet has a higher degree of curing than the center; the degree of curing of the semi-cured sheet is effectively controlled (specifically, the degree of curing at the edge of the semi-cured sheet becomes larger, but the degree of curing of the central semi-cured sheet remains unchanged), so that the molecular weight of the resin of the semi-cured sheet increases when it is heated, and the viscosity of the resin increases after the molecular weight increases, and the filler is carried along by the high-viscosity resin to flow, thereby retaining the fluidity of the semi-cured sheet during the lamination process to avoid water flow lines and improve the thickness uniformity and consistency of the board at various locations.

[0014] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of an embodiment of the utility model (prepreg sheet is not shown);

[0016] Figure 2 It is a front view of an embodiment of the utility model;

[0017] Figure 3 It is a cross-sectional view of an embodiment of the utility model;

[0018] Figure 4 It is another cross-sectional view of an embodiment of the present utility model (prepreg sheet not shown).

[0019] Description of the accompanying drawings:

[0020] 10. First heating plate 11. Make way

[0021] 12. Installation position 13. Vent hole

[0022] 14. First transverse edge 15. Second transverse edge

[0023] 16. First vertical edge 17. Second vertical edge

[0024] 20. Second heating plate 30. Prepreg. DETAILED DESCRIPTION

[0025] Please refer to Figures 1 to 4 As shown, it shows the specific structure of an embodiment of the utility model.

[0026] In the description of the present invention, it should be noted that directional words such as the terms "up", "down", "front", "back", "left", "right", etc., which indicate directions and positional relationships, are based on the directions or positional relationships shown in the drawings or during normal wearing and use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present invention.

[0027] A heating plate for improving water flow defects of a prepreg comprises a first heating plate 10 and a second heating plate 20.

[0028] The first heating plate 10 and the second heating plate 20 both have a clearance opening 11 for exposing the prepreg 30 and an air outlet 13 for letting gas flow out. The first heating plate 10 and the second heating plate 20 are arranged opposite to each other up and down to enclose and form a mounting position 12 for accommodating the prepreg 30; the air outlet 13 of the first heating plate 10 passes through the air outlet 13 of the second heating plate 20 up and down.

[0029] Preferably, the first heating plate 10 and the second heating plate 20 each include a first transverse edge 14, a second transverse edge 15, a first vertical edge 16 and a second vertical edge 17, one end of the first transverse edge 14 is connected to one end of the first vertical edge 16, and the other end of the first transverse edge 14 is connected to one end of the second vertical edge 17; the second transverse edge 15 is connected to the other end of the first vertical edge 16, and the second transverse edge 15 is connected to the other end of the second vertical edge 17, so as to enclose and form a make way opening 11.

[0030] Preferably, the first transverse side 14, the second transverse side 15, the first vertical side 16 and the second vertical side 17 of the first heating plate 10 are arranged vertically opposite to the first transverse side 14, the second transverse side 15, the first vertical side 16 and the second vertical side 17 of the second heating plate 20 and surround and form a mounting position 12. Preferably, the plurality of air outlet holes 13 are sequentially arranged at intervals on the corresponding first transverse side 14, the second transverse side 15, the first vertical side 16 and the second vertical side 17; the plurality of air outlet holes 13 are respectively connected to the upper and lower surfaces of the corresponding first transverse side 14, the second transverse side 15, the first vertical side 16 and the second vertical side 17. Preferably, the aperture of the air outlet hole 13 is 0.001mm-100mm.

[0031] The preparation method thereof comprises the following steps:

[0032] First, take at least one prepreg 30 and laminate copper foil on one or both sides thereof to obtain a prepreg 30 assembly;

[0033] Secondly, take at least one group of the above-mentioned prepregs 30 and put them between the first heating plate 10 and the second heating plate 20 of the laminator, remove the first heating plate 10 by a pulley (not shown in the figure), and then put the prepregs 30 on the second heating plate 20, and then close the first heating plate 10, use the air outlet 13 to compress the air, and control the upper and lower gas flow ratio of the first heating plate 10 and the second heating plate 20 to be 1:3, so that the edge of the prepreg 30 located in the installation position 12 is in a suspended state (and does not touch the first heating plate 10), so that the edge of the prepreg 30 is cured more than the center, ready for lamination;

[0034] Then the heating temperature range of the first heating plate 10 and the second heating plate 20 is 180°C.

[0035] -200 ℃, the hot plate irradiates the edge of the semi-cured sheet 30 for 3-5 minutes, so that the curing degree of the edge of the semi-cured sheet 30 is more than 80%. By controlling the radiation time and temperature, the curing degree of the semi-cured sheet 30 is effectively controlled, so that the molecular weight of the resin of the semi-cured sheet 30 increases when heated, and the viscosity of the resin increases after the molecular weight increases. The filler flows together with the high-viscosity resin, thereby avoiding water flow marks. According to the conventional step-type lamination operation, the first horizontal edge 14, the second horizontal edge 15, the first vertical edge 16 and the second vertical edge 17 of the first heating plate 10 and the second heating plate 20 are in the normal plate cutting edge position and will be cut off, which will not affect the subsequent plate quality.

[0036] The design focus of the utility model is that it mainly uses the structural design and coordination of the first heating plate and the second heating plate. During the lamination process, the installation position is used to provide a holding space for the semi-cured sheet, the first heating plate and the second heating plate are heated and baked in a light radiation manner, the air outlet is used to compress the air, and the upper and lower gas flow ratios of the first heating plate and the second heating plate are controlled to be 1:3, so that the edge portion of the semi-cured sheet located in the installation position is in a suspended state, so that the edge portion of the semi-cured sheet has a higher degree of curing than the center; the degree of curing of the semi-cured sheet is effectively controlled (specifically, the degree of curing at the edge of the semi-cured sheet becomes larger, but the degree of curing of the central semi-cured sheet remains unchanged), so that the molecular weight of the resin of the semi-cured sheet increases when it is heated, and the viscosity of the resin increases after the molecular weight increases, and the filler is brought together to flow through the high-viscosity resin, thereby retaining the fluidity of the semi-cured sheet during the lamination process, so as to avoid water flow lines and improve the thickness uniformity and consistency of the board at various locations.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A heating plate for improving water flow defects of prepreg, characterized in that: The invention comprises a first heating plate and a second heating plate, each of which has a clearance opening for exposing a semi-cured sheet and an air outlet for letting gas flow out, and the first heating plate and the second heating plate are arranged opposite to each other up and down to enclose and form a mounting position for accommodating the semi-cured sheet; the air outlet of the first heating plate passes through the air outlet of the second heating plate up and down.

2. The heating plate for improving water flow defects of prepreg according to claim 1, characterized in that: The first heating plate and the second heating plate each include a first transverse edge, a second transverse edge, a first vertical edge and a second vertical edge, one end of the first transverse edge is connected to one end of the first vertical edge, and the other end of the first transverse edge is connected to one end of the second vertical edge; the second transverse edge is connected to the other end of the first vertical edge, and the second transverse edge is connected to the other end of the second vertical edge to form a clearance opening.

3. The heating plate for improving water flow defects of prepreg according to claim 2, characterized in that: The first transverse side, the second transverse side, the first vertical side and the second vertical side of the first heating plate are arranged vertically opposite to the first transverse side, the second transverse side, the first vertical side and the second vertical side of the second heating plate and surround a mounting position.

4. The heating plate for improving water flow defects of prepreg according to claim 2, characterized in that: The plurality of air outlet holes are sequentially spaced apart on the corresponding first transverse edge, the second transverse edge, the first vertical edge and the second vertical edge; the plurality of air outlet holes respectively penetrate the upper and lower surfaces of the corresponding first transverse edge, the second transverse edge, the first vertical edge and the second vertical edge.

5. The heating plate for improving water flow defects of prepreg according to claim 1, characterized in that: The aperture of the air outlet is 0.001mm-100mm.

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