CN104582248A - FR4 reinforcement plate production method and FPC (flexible printed circuit) reinforcement method - Google Patents
FR4 reinforcement plate production method and FPC (flexible printed circuit) reinforcement method Download PDFInfo
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- CN104582248A CN104582248A CN201410826374.9A CN201410826374A CN104582248A CN 104582248 A CN104582248 A CN 104582248A CN 201410826374 A CN201410826374 A CN 201410826374A CN 104582248 A CN104582248 A CN 104582248A
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Abstract
The invention discloses an FR4 reinforcement plate production method. Prepreg is provided, the initial reaction temperature and the peak reaction temperature of the prepreg are determined, the highest hot pressing temperature is between the initial reaction temperature and the peak reaction temperature of the prepreg, and a certain number of prepreg are stacked to form a prepreg assembly; the prepreg assembly is subjected to hot pressing at the highest hot pressing temperature, and an FR4 reinforcement plate is formed. The invention provides a production method of a sticky FR4 reinforcement plate. The FR4 reinforcement plate produced with the method can be directly used for FPC reinforcement, the process flow is saved, and the product thickness is convenient to control; the FR4 reinforcement plate can be matched with a thermosetting adhesive film to reinforce an FPC, and the binding force of the FR4 reinforcement plate and the thermosetting adhesive film is improved. Besides, the invention further discloses the FR4 reinforcement plate produced with the method as well as a method for reinforcing the FPC through the FR4 reinforcement plate.
Description
Technical field
The present invention relates to FPC production technical field, particularly relate to a kind of production method of FR4 stiffening plate and the reinforcement of FPC.
Background technology
Stiffening plate is Stiffeners again, is widely used in electronic product in FPC flexible circuit board, and stiffening plate mainly solves the pliability of flexible PCB, improves the intensity of plugging position, facilitates the overall package of product.
The bonding mode that existing FPC and FR4 stiffening plate (glass fiber-reinforced plate) is general is, first false subsides one deck thermosetting glued membrane on FR4 stiffening plate face, then bores location hole and punching molding, carries out hot pressing after finally fitting with FPC again.
Such way not only increases the work flow of FPC, adds production cost, is also unfavorable for the control of FPC finished product thickness simultaneously.
In addition when using thermosetting glued membrane, in order to improve stiffening plate face and glued membrane vacation is pasted and adhesion after hot pressing, FPC usually has in the industry two kinds of ways, one is the roughness using the mechanical nog plate modes such as roller brush, sandblasting to improve stiffening plate face, and it two be the FR4 stiffening plate obtaining surface coarsening by the mode that the whole plate of FR4 copper-clad plate etches.These ways add the processing link of FPC, cause the increase of production cost.
Therefore need badly and provide a kind of self structure simple, and itself and FPC bonding process can be simplified, improve the FR4 prepreg of adhesive property.
Summary of the invention
One object of the present invention is: the production method providing a kind of FR4 stiffening plate, and it makes its surface have caking property by hot pressing prepreg under specified temp environment, makes its adhesive property more reliable.
Another object of the present invention is: provide a kind of FR4 stiffening plate, and its surface heat thermosetting resin glue does not solidify completely, makes himself to have certain caking property.
Another object of the present invention is: the reinforcement providing a kind of FPC, and it adopts the sticking FR4 stiffening plate of the surperficial tool be made up of prepreg directly to bond with FPC, decreases the hot-setting adhesive membrane process that bonds, enhances productivity.
Another object of the present invention is: the reinforcement providing a kind of FPC, it carries out reinforcement to FPC after adopting the sticking FR4 stiffening plate of the surperficial tool be made up of prepreg and thermosetting glued membrane to bond, and the sticking FR4 stiffening plate of tool and thermosetting glued membrane bond and can significantly improve the adhesion with thermosetting glued membrane.
For reaching this object, the present invention by the following technical solutions:
On the one hand, a kind of production method of FR4 stiffening plate is provided, comprises the following steps:
Step S1, hot compression parameters are determined, a kind of prepreg is provided, determine initial reaction temperature and the peak value reaction temperature of described prepreg, and determine the highest hot pressing temperature by described initial reaction temperature and described peak value reaction temperature, the highest hot pressing temperature described in making is between the initial reaction temperature and peak value reaction temperature of described prepreg;
Step S2, stacking, the described prepreg of some is carried out stacking, forms prepreg assembly;
Step S3, hot pressing, carry out hot pressing in the highest described hot pressing temperature to described prepreg assembly, makes it form FR4 stiffening plate.
Preferably, determine in step S1 that initial reaction temperature and the peak value reaction temperature of described prepreg record for adopting differential scanning calorimetry.
Concrete, described initial reaction temperature, represents the temperature that molecular resin at this temperature starts to occur cross-linking reaction; Described peak value reaction temperature, represents the reaction rate of molecular resin at this temperature and reaches the highest temperature; The highest described hot pressing temperature, the maximum temperature of bearing when representing prepreg hot pressing.
At a proper temperature hot pressing is carried out to prepreg assembly, make it form not completely crued state, and realize bonding between adjacent prepreg, form an overall FR4 stiffening plate.FR4 stiffening plate two surfaces toward the outer side are not solidified completely, still there is certain viscosity, can make its directly and FPC carry out thermo-compression bonding.
Or adopt the not completely crued FR4 stiffening plate in surface to be first connected with thermosetting glued membrane, connect FPC more afterwards, tool sticking FR4 stiffening plate is connected with thermosetting glued membrane can produce larger cohesive force, improves switching performance.
As a kind of optimal technical scheme of the production method of described FR4 stiffening plate, the process of described hot pressing is continue hot pressing 10min ~ 40min under the highest described hot pressing temperature.
As a kind of optimal technical scheme of the production method of described FR4 stiffening plate, before hot pressing is carried out to described prepreg assembly, separated type material is set on the surface of described prepreg assembly.
Described separated type material can be release film or mould release, described prepreg assembly and heating platen being isolated, preventing described prepreg assembly and heating platen from boning by arranging separated type material.
As a kind of optimal technical scheme of the production method of described FR4 stiffening plate, the quantity of described prepreg depends on the thickness of the thickness of individual prepreg and the obtained described FR4 stiffening plate of needs.
As a kind of optimal technical scheme of the production method of described FR4 stiffening plate, the highest described hot pressing temperature is not higher than described initial reaction temperature+20 DEG C.
As a kind of optimal technical scheme of the production method of described FR4 stiffening plate, after described step S3, perform step S4:
Step S4, after hot pressing completes, the △ Tg of FR4 stiffening plate to be detected.
As a kind of optimal technical scheme of the production method of described FR4 stiffening plate, the curing degree of FR4 stiffening plate is judged according to △ Tg, if △ Tg >=10 DEG C of described FR4 stiffening plate, described FR4 stiffening plate curing degree is qualified, if the △ Tg < 10 DEG C of described FR4 stiffening plate, described FR4 stiffening plate curing degree is defective.
Concrete, adopt same equipment, the Same Way Tg value to FR4 stiffening plate to carry out twice measurement, the difference of twice is the △ Tg of stiffening plate, and the less state of cure of △ Tg is higher, requires △ Tg >=10 DEG C of FR4 stiffening plate in the technical program.In hot pressing, temperature is higher, the time is longer, and △ Tg is less, otherwise temperature is lower, the time is shorter, and △ Tg is larger.
Preferably, DSC is adopted to detect FR4 stiffening plate glass transition temperature, Tg1 and Tg2 is obtained respectively by twice test, △ Tg is drawn by the difference of Tg1 and Tg2, the curing degree of FR4 stiffening plate is judged according to the size of △ Tg, △ Tg and FPC is proportionate with the adhesion of FR4 stiffening plate, and namely the larger adhesion of △ Tg is stronger.
Further, adhesion uses vertical peel strength to characterize, adhesion requirement >=1.0N/mm.
On the other hand, provide a kind of FR4 stiffening plate, it adopts the production method of FR4 stiffening plate as above to obtain, and the thickness range of described FR4 stiffening plate is at 0.05 ~ 3.0mm.
Again on the one hand, provide the reinforcement of a kind of FPC, provide a kind of FR4 stiffening plate, adopt described FR4 stiffening plate and described FPC to carry out hot pressing, carry out reinforcement to described FPC, described FR4 stiffening plate adopts the production method of FR4 stiffening plate as above to obtain.
Direct employing has the FR4 stiffening plate of certain viscosity and FPC carries out thermo-compression bonding, can reduce the work flow of FPC, reduce the thickness that production cost is convenient to control FPC finished product simultaneously.
Another aspect, the reinforcement of a kind of FPC is provided, a kind of FR4 stiffening plate is provided, described FR4 stiffening plate and described FPC is adopted to carry out hot pressing, reinforcement is carried out to described FPC, described FR4 stiffening plate adopts the production method of FR4 stiffening plate as above to obtain, between described FR4 stiffening plate and described FPC, arrange thermosetting glued membrane.
Adopt the FR4 stiffening plate with certain viscosity to be connected with thermosetting glued membrane, the adhesion of itself and thermosetting glued membrane can be significantly improved by the viscosity on its surface.
Beneficial effect of the present invention is: provide a kind of production method carrying close-burning FR4 stiffening plate, and the FR4 stiffening plate adopting the method to produce can be directly used in FPC reinforcement, saves work flow, is convenient to control product thickness; Also may be used for coordinating with thermosetting glued membrane and the adhesion that reinforcement improves itself and thermosetting glued membrane is carried out to FPC.
Accompanying drawing explanation
According to drawings and embodiments the present invention is described in further detail below.
Fig. 1 is the production method flow chart of FR4 stiffening plate described in the embodiment of the present invention.
Fig. 2 is FR4 stiffening plate structural representation described in the embodiment of the present invention.
In figure:
1, FR4 stiffening plate; 2, prepreg.
Embodiment
Technical scheme of the present invention is further illustrated by comparative example and embodiment below in conjunction with accompanying drawing.
As shown in Figure 1, 2:
A production method for FR4 stiffening plate, comprises the following steps:
Step S1, hot compression parameters are determined, provide a kind of prepreg, determine initial reaction temperature and the peak value reaction temperature of prepreg, and determine the highest hot pressing temperature by initial reaction temperature and peak value reaction temperature; Initial reaction temperature and peak value reaction temperature record for adopting differential scanning calorimetry;
Step S2, stacking, according to the thickness of individual prepreg and need the thickness of obtained FR4 stiffening plate to be undertaken stacking by the prepreg of some, form prepreg assembly;
Step S3, hot pressing, after two surfaces of prepreg assembly arrange separated type material respectively, carry out hot pressing in the highest hot pressing temperature to prepreg assembly, hot pressing time is 10min ~ 40min, makes it form FR4 stiffening plate;
Step S4, detection, after hot pressing completes, adopt same equipment, the Same Way Tg value to FR4 stiffening plate to carry out twice measurement, the difference of twice is the △ Tg of stiffening plate, judges state of cure and the adhesion of FR4 stiffening plate according to △ Tg.
A kind of FR4 stiffening plate, adopt the production method of FR4 stiffening plate as above to obtain, the thickness range of this FR4 stiffening plate is at 0.05 ~ 3.0mm.
A reinforcement of FPC, provides a kind of FR4 stiffening plate, adopts FR4 stiffening plate and FPC to carry out hot pressing, carries out reinforcement to FPC, and FR4 stiffening plate adopts the production method of FR4 stiffening plate as above to obtain.
The reinforcement of another FPC, a kind of FR4 stiffening plate is provided, adopts FR4 stiffening plate and FPC to carry out hot pressing, reinforcement is carried out to FPC, FR4 stiffening plate adopts the production method of FR4 stiffening plate as above to obtain, and arranges thermosetting glued membrane between FR4 stiffening plate and FPC.
Embodiment one:
In the present embodiment, introduce the production method that a kind of thickness specification is the FR4 stiffening plate of 0.4 ㎜, there is provided two models be 7628 prepreg 2, adopting DSC to detect to determine the initial reaction temperature of this prepreg 2 to be 130 DEG C and peak value reaction temperature is 165 DEG C, and determines that the highest hot pressing temperature is 150 DEG C by this initial reaction temperature and peak value reaction temperature; These two prepregs 2 are carried out stacking, forms prepreg assembly; After respectively release film is arranged to prepreg assembly two surface, the highest hot pressing temperature 150 DEG C, hot pressing 30min is carried out to prepreg assembly, make it form FR4 stiffening plate 1.The △ Tg being detected this FR4 stiffening plate 1 by DSC is 15 DEG C.
Making it direct is 1.0N/mm with testing vertical peel strength after FPC hot binding.
Use this FR4 stiffening plate 1 and 1 ounce of electrolytic copper foil, 25 μm of thermosetting glued membranes carry out superimposed, at 170 DEG C, hot pressing 40min under the parameter of 200PSI, then test the peel strength of 90 °, glued membrane.Can show that the adhesion of FR4 stiffening plate and thermosetting glued membrane is 2.3N/mm thus.
Embodiment two:
In the present embodiment, introduce the production method that another kind of thickness specification is the FR4 stiffening plate of 0.4 ㎜, there is provided two models be 7628 prepreg 2, adopting DSC to detect to determine the initial reaction temperature of this prepreg 2 to be 130 DEG C and peak value reaction temperature is 165 DEG C, and determines that the highest hot pressing temperature is 140 DEG C by this initial reaction temperature and peak value reaction temperature; These two prepregs 2 are carried out stacking, forms prepreg assembly; After respectively release film is arranged to prepreg assembly two surface, the highest hot pressing temperature 140 DEG C, hot pressing 30min is carried out to prepreg assembly, make it form FR4 stiffening plate 1.The △ Tg being detected this FR4 stiffening plate 1 by DSC is 20 DEG C.
Making it direct is 1.8N/mm with testing vertical peel strength after FPC hot binding.
Use this FR4 stiffening plate 1 and 1 ounce of electrolytic copper foil, 25 μm of thermosetting glued membranes carry out superimposed, at 170 DEG C, hot pressing 40min under the parameter of 200PSI, then test the peel strength of 90 °, glued membrane.Can show that the adhesion of FR4 stiffening plate and thermosetting glued membrane is 2.7N/mm thus.
Embodiment three:
In the present embodiment, introduce the production method that another kind of thickness specification is the FR4 stiffening plate of 0.4 ㎜, there is provided two models be 7628 prepreg 2, adopting DSC to detect to determine the initial reaction temperature of this prepreg 2 to be 130 DEG C and peak value reaction temperature is 165 DEG C, and determines that the highest hot pressing temperature is 160 DEG C by this initial reaction temperature and peak value reaction temperature; These two prepregs 2 are carried out stacking, forms prepreg assembly; After respectively release film is arranged to prepreg assembly two surface, the highest hot pressing temperature 160 DEG C, hot pressing 30min is carried out to prepreg assembly, make it form FR4 stiffening plate 1.The △ Tg being detected this FR4 stiffening plate 1 by DSC is 10 DEG C.
Making it direct is 0.8N/mm with testing vertical peel strength after FPC hot binding.
Use this FR4 stiffening plate and 1 ounce of electrolytic copper foil, 25 μm of thermosetting glued membranes to carry out superimposed, at 170 DEG C, hot pressing 40min under the parameter of 200PSI, then test the peel strength of 90 °, glued membrane.Can show that the adhesion of FR4 stiffening plate and thermosetting glued membrane is 1.7N/mm thus.
Embodiment four:
In the present embodiment, introduce the production method that a kind of thickness specification is the FR4 stiffening plate of 0.4 ㎜, there is provided two models be 7628 prepreg 2, adopting DSC to detect to determine the initial reaction temperature of this prepreg 2 to be 130 DEG C and peak value reaction temperature is 165 DEG C, and determines that the highest hot pressing temperature is 150 DEG C by this initial reaction temperature and peak value reaction temperature; These two prepregs 2 are carried out stacking, forms prepreg assembly; After respectively release film is arranged to prepreg assembly two surface, the highest hot pressing temperature 150 DEG C, hot pressing 20min is carried out to prepreg assembly, make it form FR4 stiffening plate 1.The △ Tg being detected this FR4 stiffening plate 1 by DSC is 18 DEG C.
Making it direct is 1.3N/mm with testing vertical peel strength after FPC hot binding.
Use this FR4 stiffening plate 1 and 1 ounce of electrolytic copper foil, 25 μm of thermosetting glued membranes to carry out superimposed, at 170 DEG C, hot pressing 40min under the parameter of 200PSI, then test the peel strength of 90 °, glued membrane.Can show that FR4 stiffening plate 1 is 2.4N/mm with the adhesion of thermosetting glued membrane thus.
It is pointed out that in the above-described embodiments, initial reaction temperature, represent the temperature that molecular resin at this temperature starts to occur cross-linking reaction; Peak value reaction temperature, represents the reaction rate of molecular resin at this temperature and reaches the highest temperature; The highest hot pressing temperature, the maximum temperature of bearing when representing prepreg hot pressing.
Comparative example one:
In comparative example, adopt conventional FR4 stiffening plate, the △ Tg being tested FR4 stiffening plate by DSC is 4 DEG C.
Making it direct is 0.3N/mm with testing vertical peel strength after FPC hot binding.
Use this stiffening plate and 1 ounce of electrolytic copper foil, 25 μm of thermosetting glued membranes carry out superimposed, at 170 DEG C, hot pressing 40min under the parameter of 200PSI, then test the peel strength of 90 °, glued membrane.Can show that the adhesion of conventional FR4 stiffening plate and thermosetting glued membrane is 1.2N/mm thus.
Embodiment and comparative example parameter lookup table:
By above-described embodiment and comparative example known, the less state of cure of △ Tg is higher.In hot pressing, temperature is higher, the time is longer, and △ Tg is less; Otherwise temperature is lower, the time is shorter, △ Tg is larger.△ Tg and FPC is proportionate with the adhesion of FR4 stiffening plate, and namely the larger adhesion of △ Tg is stronger.
Therefore, at a proper temperature hot pressing is carried out to prepreg assembly and make it form not completely crued state, and realize bonding between adjacent prepreg, form an overall FR4 stiffening plate.
FR4 stiffening plate two surfaces toward the outer side are not solidified completely, still there is certain viscosity, can make its directly and FPC carry out thermo-compression bonding.The adhesion of itself and FPC has been greater than the adhesion of conventional FR4 stiffening plate in comparative example one and thermosetting glued membrane under suitable condition, therefore directly uses itself and FPC to bond and can play better effect.
Adopt surface not solidify FR4 stiffening plate and thermosetting glued membrane completely to bond and also can produce larger adhesion simultaneously.
It is to be understood that; above-mentioned embodiment is only preferred embodiment of the present invention and institute's application technology principle; in technical scope disclosed in this invention, the change that any those skilled in the art of being familiar with easily expect or replacement, all should be encompassed in protection scope of the present invention.
Claims (10)
1. a production method for FR4 stiffening plate, is characterized in that, comprises the following steps:
Step S1, hot compression parameters are determined, a kind of prepreg is provided, determine initial reaction temperature and the peak value reaction temperature of described prepreg, and determine the highest hot pressing temperature by described initial reaction temperature and described peak value reaction temperature, the highest hot pressing temperature described in making is between the initial reaction temperature and peak value reaction temperature of described prepreg;
Step S2, stacking, the described prepreg of some is carried out stacking, forms prepreg assembly;
Step S3, hot pressing, carry out hot pressing in the highest described hot pressing temperature to described prepreg assembly, makes it form FR4 stiffening plate.
2. the production method of FR4 stiffening plate according to claim 1, is characterized in that, the process of described hot pressing is continue hot pressing 10min ~ 40min under the highest described hot pressing temperature.
3. the production method of FR4 stiffening plate according to claim 1, is characterized in that, before carrying out hot pressing to described prepreg assembly, arrange separated type material on the surface of described prepreg assembly.
4. the production method of FR4 stiffening plate according to claim 1, is characterized in that, the quantity of described prepreg depends on the thickness of the thickness of individual prepreg and the obtained described FR4 stiffening plate of needs.
5. the production method of FR4 stiffening plate according to claim 1, is characterized in that, the highest described hot pressing temperature is not higher than described initial reaction temperature+20 DEG C.
6. the production method of the FR4 stiffening plate according to any one of Claims 1 to 5, is characterized in that, after described step S3, perform step S4:
Step S4, after hot pressing completes, the △ Tg of FR4 stiffening plate to be detected.
7. the production method of FR4 stiffening plate according to claim 6, it is characterized in that, the curing degree of FR4 stiffening plate is judged according to △ Tg, if △ Tg >=10 DEG C of described FR4 stiffening plate, described FR4 stiffening plate curing degree is qualified, if the △ Tg < 10 DEG C of described FR4 stiffening plate, described FR4 stiffening plate curing degree is defective.
8. a FR4 stiffening plate, is characterized in that, adopt the production method of the FR4 stiffening plate according to any one of claim 1 to 7 to obtain, the thickness range of described FR4 stiffening plate is at 0.05 ~ 3.0mm.
9. the reinforcement of a FPC, a kind of FR4 stiffening plate is provided, adopts described FR4 stiffening plate and described FPC to carry out hot pressing, reinforcement is carried out to described FPC, it is characterized in that, described FR4 stiffening plate adopts the production method of the FR4 stiffening plate according to any one of claim 1-7 to obtain.
10. the reinforcement of a FPC, a kind of FR4 stiffening plate is provided, described FR4 stiffening plate and described FPC is adopted to carry out hot pressing, reinforcement is carried out to described FPC, it is characterized in that, described FR4 stiffening plate adopts the production method of the FR4 stiffening plate according to any one of claim 1-7 to obtain, between described FR4 stiffening plate and described FPC, arrange thermosetting glued membrane.
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| CN1960605A (en) * | 2005-11-01 | 2007-05-09 | 比亚迪股份有限公司 | Reinforced bonding method and bonding method between shielding layer of print circuit board and supporting material |
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