KR900000855B1 - Resin-impregnated base and method of manufacturing same - Google Patents

Abstract

A resin impregnated sheet having a good moldability at lower temp. and heat resistancy, is prepd. by impregnating fabrics in resin. Thus glass fabrics with 0.15mm thickness and 1050 mm width are impregnated in resin varnish bath of brominated epoxy resin (resin content is 65%) contg. curing agent. The resin impregnated glass fabrics are squeezed to have 45% resin content and dried to give dried sheet. 8 Number of the dried sheet are laminated and compression molded at 30 Kg/cm2, 170≰C for 90 min.

Description

Resin impregnated sheet material and manufacturing method thereof

1 is a partial cross-sectional side view of some embodiments of an apparatus for use in the manufacture of the resin impregnated sheet of the present invention,

2 is a partial cross-sectional side view of the roll covering machine.

3 is a partial mirror view of an enlarged roll coater.

The present invention relates to a sheet-like material impregnated with a resin and a method of manufacturing the same, and more particularly, to a resin-impregnated sheet-like material capable of molding under low pressure and having excellent thermal properties.

The resin impregnated sheet-like material of the type mentioned may be prepared by stacking and molding a plurality of resin impregnated sheet-like materials with metal foils, or by internal circuit board (s), or laminates coated with multiple layers of metal foil. It is useful for producing multi-ply printed-wiring boards of laminated resin impregnated sheet-like materials.

Until now, this type of resin impregnated sheet-like material has been impregnated with a sheet-like material such as glass woven fabric with varnish of a thermosetting resin such as epoxy resin and phenol resin, and then dried in a suitable dryer to produce a resin-impregnated sheet-like material.

The resin-impregnated sheet-like material prepared in this manner can be laminated with a metal foil placed on the uppermost layer thereof and subjected to heat compression molding to obtain a laminate coated with a metal foil for use in a printed wiring board. Examples of this type of resin impregnated sheet-like material are described in Japanese Patent Publication No. 55-38274.

On the other hand, these resin-impregnated sheet-like materials contain 1,000 to 6,000 marks per square inch, and in some cases 50,000 to 100,000 marks, and need to be subjected to heat compression molding under significant pressure to rule out void formation. there was. However, in this case, productivity decreases and high pressure molding is inadequate for continuous production of the laminate, and the application of high pressure increases the dimensional change rate of the resulting laminate, for example, in the case of making a printed wiring board with a laminate coated with metal foil. The problem arises that the printed circuit on the water is easily separated from the intended position. In addition, another problem arises that the high pressure applied during molding reduces the resistance to moisture by reducing the amount of resin at the interface between the resin impregnated sheet-like material and the metal foil.

Therefore, the main object of the present invention is to heat-compress molded products such as metal foil-coated laminates under low pressure in order to improve productivity, and to form them in continuous molding, and the resin impregnated sheet having high dimensional stability and resistance to moisture It is to provide a phase material and a method of manufacturing the same.

According to the present invention, this object can be achieved by providing a resin-impregnated sheet-like material and a method for producing the same, wherein the resin-impregnated sheet-like material is impregnated with a resin varnish and then dried. The amount of missing part is lower than the expected value).

In the measurement according to the invention, the metal foil-coated laminate under low pressure and its composition are sufficiently suppressed that the generation of bubbles is sufficiently suppressed during the heat compression molding of a plurality of resin-impregnated sheet-like materials laminated to allow continuous molding at low pressure. When molding the product, it is possible to retain the optimum amount of resin at the boundary between the resin impregnated sheet-like material and the metal foil, and to produce a product having high resistance to moisture (hygroscopicity).

Other objects and advantages of the present invention will become apparent from the following detailed description of the invention described with reference to preferred embodiments of the invention.

While the invention is now described in terms of preferred embodiments, the invention does not only limit the invention to the specific embodiments, but includes all modifications, additions, and equivalent adjustments possible within the scope of the claims.

Known resin-impregnated sheet-like materials when bubbles or areas in the fibrous material of sheet-like material, such as glass cloth, not impregnated with a thermosetting resin, i.e., a resin-free sheet-like material produced by impregnation, in a large amount. Based on this fact, the present invention provides a resin-impregnated sheet-like material having a small amount of total amount of a resin-free region (a bubble or a point where the resin is not impregnated) on the basis of this fact.

According to a first aspect of the present invention, there is provided a resin-impregnated sheet-like material in which the total area of the resin-free region is less than 0.3% of the total area of the sheet-like material. More specifically, nonwoven fabrics, such as glass woven fabrics, nylon, tetron (polyester resins produced by Toyo Rayon and Teijin), nonwoven fabrics, papers, etc. are used as sheet-like materials and are usually pressurized and removed during impregnation. The thermosetting resin varnish is impregnated using any of varnishes such as polyamide, polyester, epoxy, and the like, and then the impregnated resin is dried to obtain a resin impregnated sheet-like material.

It will be appreciated that the percentage of areas free of resin can be measured, for example, by known whiteness, optical transmission detection or X-ray images. Furthermore, it is particularly preferable to obtain the total area of the resin free area by adding the number of bubbles multiplied by the average area of the bubbles to the average area of the points where the resin in the fiber multiplied by the point where many resins are not impregnated.

Metal foil-coated laminates obtained from a plurality of resin-impregnated sheet-like materials obtained by laminating by heat compression molding under low pressure with a total area of no resin area of less than 0.3% have no void formation, heat insulation and moisture as well as electrical insulation. It has been found that the resistance to is excellent.

Furthermore, when selecting a resin impregnated sheet-like material having a total area free of resin less than 0.3% by measuring by whiteness or light transmission detection, the whiteness or light transmittance is too high when the thickness of the resin-impregnated sheet-like material is 0.10 mm or less and 0.30. Since it is too low when it is more than mm, it was found that the thickness of the resin impregnated sheet-like material was optimal when the thickness of the resin-impregnated sheet-like material was within the range of 0.10 to 0.3 mm so that the difference between the region without resin and other regions was sufficient.

The comparative example equivalent to the Example which performs this invention and a well-known technique is as follows.

Example 1

A glass woven fabric of 0.15 thick and 1050 mm wide is immersed in a resin varmish bath for impregnation of brominated epoxy resin with 65 wt% resin and containing a curing agent, compressed into a roll and released from it. The fabric was uniformly impregnated with a varnish so that the amount was 45% by weight, and then dried to obtain a resin impregnated sheet-like material. Eight obtained resin-impregnated sheet-like materials were loaded, and the laminated body was shape | molded by heat compression forming for 90 minutes on 30 kg / cm <2> and 170 degreeC conditions.

Example 2

After dipping the glass woven fabric having a thickness of 0.20 mm and a width of 1050 mm in the impregnating bath of the epoxy resin varnish as in Example 1, the impregnating bath was kept at 50 tor Subatmospheric pressure for 2 minutes, and then at atmospheric pressure. After the fiber was uniformly impregnated with varnish so that the resin content was 45% by weight, the fibers were taken out of the bath and dried to obtain a resin impregnated sheet-like material. A laminate of the resin-impregnated sheet-like material obtained as above was obtained under the same conditions as in Example 1.

Comparative Example 1

A resin-impregnated sheet-like material was obtained in the same manner as in Example 1 except for roll compression release in the tank, to obtain a laminate in the same manner as in Example 1.

Comparative Example 2

A resin-impregnated sheet-like material was obtained in the same manner as in Example 1 except that a sheet-like material having a thickness of 0.40 mm was used to obtain a laminate in the same manner as in Example 1.

Comparative measurements for the products of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table (I) below.

TABLE 1

(*) The heat resistance (A) is the heat resistance of the humidified laminate after immersing the laminate in boiling water for 4 hours and then placed on 260 ° C. molten solder, and the heat resistance (B) is immersed in 260 ° C. molten solder. Other than that, the heat resistance of the humidified laminate is similar.

The comparative measurements of Table (I) show that the laminate produced from the resin-impregnated sheet-like material according to the present invention is free of voids and excellent in heat resistance.

According to a second aspect of the present invention, there is provided a resin-impregnated sheet-like material having a bubble number of less than 500pcs / in ² in the resin-free region. In particular, the sheet-like material may be one of paper or nonwovens containing not only one of the woven fabrics mentioned in the first feature but also asbestos or any other inorganic fibers or blends thereof, the varnish being the thermosetting number of the first feature. In addition to the varnish, it may be a thermoplastic resin varnish such as polyimide, polyphenylene polysulfide resin, polyamide resin and the like. When the sheet-like material is impregnated in the impregnation bath to impregnate the sheet-like material with a resin varnish, the sheet-like material is treated under negative pressure or as in the case of the first feature, ie, between the upper and lower nip rolls disposed in the varnish bath. The same roll pressurization and disengagement are performed. In practice, the sheet-like material is passed through a double roll arranged in three stages under a pressure of 10 kg / cm 2 to make the resin impregnation amount to 35 to 64% by weight as a solid content, and dried at 100 to 160 ° C., to less than 500pcs / in ² . The resin-impregnated sheet-like material containing the bubble of is obtained.

By laminating a predetermined number of resin impregnated sheet-like materials with the metal foil, the metal foil is disposed on one or both surfaces of the laminated sheet-like material, for example, a pressure of 10 to 30 kg / cm 2 and an upper portion at 150 to 170 ° C. And a sheet-like material laminated between the lower moving belts, followed by continuous heat compression molding to obtain a metal foil-coated laminate. In this case, the metal foil is copper, aluminum, brass, nickel, stainless steel, iron or the like. In addition, a plurality of laminated resin impregnated sheet-like material (set) is disposed between each of the two metal sheets, and then heat compression molding at 10 to 30kg / ㎠ and 150 to 170 ℃ for 10 to 30kg / ㎠ Metallic foil coated laminates can be obtained.

Examples of carrying out the second aspect of the present invention and comparative examples equivalent to the known art are as follows.

Example 3

A glass woven fabric having a thickness of 0.2 mm and a width of 1050 mm is immersed in a resin varnish for impregnation of an epoxy resin with a resin content of 70% by weight and containing a curing agent, compressed under pressure of 10 kg / cm 2 while passing through a roll roll, and then separated therefrom. The fabric is uniformly impregnated with a varnish so that the resin impregnation amount is 45% by weight, followed by drying to obtain a resin impregnated sheet-like material. After laminating the obtained six resin-impregnated sheet-like materials, a copper foil having a thickness of 0.035 mm was disposed on each of the upper and lower portions of the laminate, and was placed between the upper and lower flow belts at 20 kg / cm &lt; 2 &gt; Heat compression molding yields a laminate coated with copper foil. Furthermore, if the heating compression molding pressure is changed to 15 kg / cm 2, a quadruple printed wiring board is produced in the same manner as when producing a laminate coated with copper foil.

Example 4

A resin impregnated sheet-like material was obtained in the same manner as in Example 3 except that the resin varnish impregnation was carried out in a varnish bath under vacuum, and a quadruple printed wiring board was obtained in the same manner as in Example 3.

Example 5

A resin impregnated sheet-like material having a resin impregnation amount of 45% by weight was obtained in the same manner as in Example 4, except that kelimide (product of Rhino Poulenc) having a resin impregnation amount of 58% by weight was used instead of the impregnation resin varnish. In the same manner as 3, a quadruple printed wiring board and a laminate coated with copper foil were obtained.

Comparative Example 3

A resin-impregnated sheet-like material was obtained in the same manner as in Example 3, except that the woven fabric was not pressurized in the varnish tank for coating, and the coated laminate of the quadruple printed wiring board and copper foil was obtained in the same manner as in Example 3. To obtain.

Comparative Example 4

A resin impregnated sheet-like material was obtained in the same manner as in Example 5 except that the varnish bath was not vacuumed during the impregnation of the resin, and the laminate and quadruple printing coated with copper foil in the same manner as in Example 3. Obtain a wiring board.

Comparative Example 5

In the same manner as in Comparative Example 3, a resin-impregnated sheet-like material was obtained, and six of these resin-impregnated sheet-like materials were loaded, and a top and bottom copper foil having a thickness of 0.035 mm was placed on the top and bottom of the stacked material, followed by 50 kg / cm 2 and 170. Heat compression molding was performed at 60 DEG C for 60 minutes to obtain a laminate. The same heat compression molding was also performed at 50 kg / cm 2 and 170 ° C. for 60 minutes to obtain a quadruple printed wiring board.

Table (2) below shows comparative measurements for the products of Examples 3, 4 and 5 and Comparative Examples 3, 4 and 5.

TABLE 2

(*) The rate of dimensional change is measured within 500mm.

(**) Penetration of plating solution is measured by drilling holes in the laminate.

Looking at the comparative measurements in Table (2), according to the present invention. It will be appreciated that laminates made using resin-impregnated sheet-like materials are generally free of voids and are particularly excellent in permeability.

According to a third aspect of the present invention, there is provided a resin-impregnated sheet-like material in which the number of bubbles in a resin-free region is 500pcs / in ² and a metal foil is bonded to a resin layer treated on one side with a foil.

Using the same material as the sheet material as the second feature, a glass cloth preferably having a thickness of 0.10 to 0.30 mm and a weight of 100 to 300 g / m 2 is treated with the same impregnation resin varnish as the second feature, A resin impregnated sheet-like material was obtained in the same manner as in. In addition, a metal foil-coated laminate was obtained in the same manner as in the second feature by using the same metal foil except that the resin foil-treated metal foil was used so that the laminate of the resin-impregnated sheet-like material could be bonded. can do. In this case, the resin layer may be of the same material as the resin varnish, but should be in the range of 5 to 100 g / m 2 because the weight thereof is less than 5 g / m 2, which only leads to disadvantageous results. In particular, when the surface of the metal foil is uneven, it is preferable to set a value with respect to the rising part of the nonuniform metal foil on the basis of the thinnest part of the treated resin layer.

Examples according to the third aspect of the present invention and comparative examples thereof are as follows.

Example 6

A resin impregnated sheet-like material was obtained in the same manner as in Example 3 except that the weight of the glass cloth was selected to be 200 g / m 2. Subsequently, eight impregnated sheet-like materials were laminated, and a laminate of a resin-impregnated sheet-like material in which a copper foil having an epoxy resin layer treated to a thickness of 0.035 mm and a weight of 25 g / m &lt; 2 &gt; Placed on top, the laminate and metal foil were fixed between the upper and lower flow belts to continue heat compression molding under conditions of 15 kg / cm 2 and 170 ° C. to obtain a 1.6 mm thick copper coated laminate.

Example 7

Except for immersing the glass woven fabric in a varnish bath under vacuum for resin impregnation, a sheet-like material impregnated with resin was obtained in the same manner as in Example 6, except that a resin layer was formed on the copper foil so that the weight was 20 g / m 2. In the same manner as 6, a copper foil-coated laminate was obtained.

Example 8

A resin impregnated sheet-like material was obtained in the same manner as in Example 7, except that a glass woven fabric having a weight of 150 g / m 2 was used, and the numerical impregnation amount was 50% by weight using an impregnation tank containing 58% by weight of polyimide resin. Impregnation as possible. Using the obtained impregnated sheet-like material, a laminate coated with copper foil was obtained in the same manner as in Example 6.

Comparative Example 6

A resin impregnated sheet-like material was obtained in the same manner as in Example 6 except that copper foil without a resin layer was used, and a laminate coated with copper foil was obtained in the same manner as in Example 6.

Comparative Example 7

Eight resin-impregnated sheet-like materials were laminated, and a copper foil having a thickness of 0.035 mm was placed on top of the laminated sheet-like material, followed by heat compression molding for 60 minutes at 50 kg / cm &lt; 2 &gt; A laminate coated with phosphorus copper foil is obtained.

Comparative measuring devices for the products of Examples 6 to 8 and Comparative Examples 6 to 8 are shown in Table 3 below.

TABLE 3

(*) The rate of dimensional change is measured within 500mm.

(**) Penetration of plating solution is measured by drilling holes in the laminate.

It will be seen from Table (3) that the laminate of the present invention has been effectively improved in terms of the various factors required for the laminates of the kind mentioned.

According to a fourth aspect of the present invention, a glass cloth having a thickness of 0.10 to 0.30 mm and a weight of 100 to 300 g / m 2 is synthesized with a thermosetting resin and then dried to obtain a resin impregnated sheet-like material. The resin-impregnated sheet-like material and the metal foil-coated laminate are obtained using a method substantially the same as the second feature of the present invention except for using a specific sheet-like woven material and a resin material for impregnation. The measurements of the examples and comparative examples according to the fourth aspect of the invention are generally the same as the measurements of the third feature.

In addition, according to the fifth aspect of the present invention, in any one of the above-described features, the resin-impregnated sheet-like material is subjected to heat compression molding under a relatively low pressure of 1 to 40 kg / cm 2, thereby producing a metal foil-coated laminate. do. The measurements of the examples according to the fifth feature and comparative examples thereof are generally the same as the measurements described in connection with the first to fourth features. In particular, the rate of dimensional change has been significantly improved, and as a result, the circuit portion of the printed wiring board made of the metal foil-coated laminate can be reliably eliminated from the foreseen position during the heat compression.

In addition, the production method effective for obtaining the resin-impregnated sheet-like material of the present invention will be described. When the resin material is impregnated with the sheet-like material, the sheet-like material is continuously supplied to the pressure reduction chamber, and at the outlet of the pressure reduction chamber. It can be obtained by impregnating the resin varnish into a sheet-like material by using a pressure difference between the outside and the inside, and then drying it outside the pressure reducing chamber. Apparatus used for carrying out such a manufacturing method, comprising: a pressure reducing chamber having a means for impregnating resin varnish in a sheet-like material using a pressure difference between the outside and the inside at the outlet; a means for continuously supplying the sheet-like material to the pressure-reducing chamber, a sheet An apparatus for producing a resin-impregnated sheet-like material is provided, which is provided with a means for continuously drawing out the phase material through the outlet of the decompression chamber and a means for drying the sheet-like material continuously drawn out from the decompression chamber.

Hereinafter, a novel manufacturing method for obtaining the resin-impregnated sheet-like material of the present invention and an apparatus used for carrying out the same will be described with reference to the drawings.

In FIG. 1, the sheet-like material 1 is wound in a roll shape, is fixed to the tarlet 2, and is continuously sent therefrom. The means for continuously supplying the sheet-like material is not limited to this.

The decompression chamber 4 is decompressed by the vacuum pump 23 or the like. The sheet-like material 1 is sent to the inlet chamber 5 of the decompression chamber 4 by the guide roll 3 and enters into the decompression chamber 4 from between the inlet chambers 5. The sheet-like material 1 that has entered the decompression chamber 4 is degassed to the inside thereof while being led to the roll coating machine 7 by the turn rolls 6. The roll 8 of the roll coating machine 7 is arranged so that a part is contained in the tank 10 in which the resin varnish 9 is contained, and the sheet-like material 1 passes therethrough. Moreover, as shown in FIG. 3, this roll 8 is arrange | positioned so that a fixed space | interval A may be made so that only resin varnish may contact, without contacting the sheet-like material 1 which passes over it. This is because when the roll 8 and the sheet-like material 1 come into contact with each other, before the resin varnish 9 penetrates into the inside of the sheet-like material 1, the sheet-like material 1 passes through the rough eyes of the sheet-like material 1. Returning to the opposite surface of), both sides of the sheet-like material 1 are wetted to prevent degassing of the sheet-like material 1, and voids may be left to prevent this. In addition, the constant space | interval A here is an interval | interval such that the roll 8 does not contact the sheet-like material 1, and the resin varnish 9 is coat | covered on one side (here bottom) of the sheet-like material 1 here. Therefore, the thickness of the resin varnish 9 adhering to the surface of the roll 8 is equal to or less than that.

In this embodiment, as shown in FIG. 2, the surface of the roll 8 that faces the sheet-like material 1 travels in a direction opposite to the traveling direction C of the sheet-like material 1. . Therefore, the amount to be coated on the bottom surface of the sheet-like material 1 is easily adjusted by changing the rotational speed of the roll 8.

The roll 8 is, for example, as shown in FIG. 3, the shaft 14 of which the rotation of the motor 12 provided in the upper part of the lid 11 of the decompression chamber 4 is provided with the mechanical chamber 13. And the shafts 15 orthogonal to the gears 15, 16 and the shaft 14 at the ends thereof. The rotation speed of the roll 8 can be adjusted by changing the rotation speed of the motor 12. Although the motor may be provided in the decompression chamber, the installation of the decompression chamber does not need to enlarge the decompression chamber, so that the capacity of the vacuum pump can be reduced. It is also easy to operate.

Returning to FIG. 1, in the roll coating machine 7, the sheet-like material 1 coated with resin varnish from the bottom is immersed in the dip 18 containing the resin varnish 9 under reduced pressure, and the resin varnish is coated on both sides. It is impregnated from both sides. The sheet-like material 1 exiting the dip 18 is pulled out by a sheet-like material winding machine (not shown in the drawing) or the like to exit the decompression chamber 4 between the outlet seat rollers 19. At this time, the sheet-like material 1 is again impregnated with the resin varnish 9 in the outlet seal unit 20. The impregnation here is a pressurized impregnation in which the sheet-like material 1 is shifted by atmospheric pressure under reduced pressure and under reduced pressure, unlike the aforementioned two impregnations (impregnation by a roll coating machine and impregnation in a dip bath).

In this way, when the resin varnish at the outlet serves as a chamber (liquid chamber) bordering the inside and the outside during the decompression, the airtightness of the decompression chamber is increased, and the capacity of the vacuum pump used for decompression can be reduced. The sheet-like material 1 leaving the decompression chamber 4 is controlled by the squeeze roll 21 or the like and sent to the dryer 22 for drying. As a means for continuously withdrawing the sheet-like material from the decompression chamber, it is possible to use other than a winding machine.

In the apparatus for continuously vacuum-impregnating the sheet-like material shown in FIG. 1, the absence of the roll coater 7 and the dip tank 18 produces the resin-impregnated sheet-like material which is the first point of the present invention. One embodiment of an apparatus for practicing the method. In this case, the sheet-like material 1 which is degassed and moved inside the decompression chamber 4 decompressed by the vacuum pump 23 or the like can be removed from the outlet of the decompression chamber 4 by using the pressure difference between the inside and the outside. The varnish 9 is impregnated and dried by the dryer 22 outside the pressure reduction chamber 4. In this embodiment, the resin varnish also served as the liquid chamber of the decompression chamber at the outlet, but it is not necessary to serve as the liquid chamber.

Like reference numerals in FIG. 1, FIG. 2, and FIG. 3 indicate the same thing. The arrow next to the sheet-like material 1 in FIG. 1 indicates the traveling direction of the sheet-like material.

Examples of the sheet-like material include paper such as kraft paper and linter paper, glass woven fabric, glass nonwoven fabric, nylon fiber woven fabric, nylon fiber nonwoven fabric, fiber such as woven fabric and / or nonwoven fabric of polyester fiber, and the like.

As the resin varnish, thermosetting resin varnishes such as thermoplastic resin varnishes, phenol resin varnishes, polyester resins, epoxy resin varnishes, and polyimide resin varnishes can be used.

In this manufacturing method, the resin varnish impregnation of the sheet-like material under reduced pressure is made so that the impregnation is facilitated by completely removing the gas present in the voids in the sheet-like material, and / or no bubbles remain in the sheet-like material. It is for.

The method for producing a resin-impregnated sheet-like material according to the present invention is based on the continuous vacuum impregnation method. According to this method, the resin-like sheet-like material impregnated with resin varnish is sufficiently or uniformly impregnated with resin varnish and voids. It becomes a high quality resin impregnated sheet-like material without. By using this resin-impregnated sheet-like material, for example, when manufacturing a laminate for a printed wiring board, there are no defects due to voids or streaks, reliability of through holes is improved, and defects due to infiltration of plating liquid are also eliminated. High quality printed wiring boards can be obtained.

The manufacturing method of the resin impregnated sheet-like material of this invention, and the apparatus used for the implementation are not limited to the said Example, There are many types. For example, the sheet-like material may be short rather than long. The actual method of the inlet for supplying the sheet-like material to the decompression chamber is not particularly limited, and the practical method of the outlet is not particularly limited, except that the actual method of the outlet is a liquid chamber, and can be implemented in various ways.

The method of coating one side of the sheet-like material with resin varnish is not limited to the method of roll coating the bottom surface, but there are various methods such as the method of roll coating the top surface and the method of shower coating. The roll coater is not limited to the coater described above, and the method of rotating the roll is also not limited. Whether or not to provide a means for impregnating the sheet-like material under reduced pressure, or if it is to be a double-sided coating means such as a dip jaw, a single-side coating means such as a roll coating machine, or one-side coating means. After passing through the double-sided coating means or other resin varnish impregnation means, it may be appropriately selected depending on the change in the processing speed of the sheet-like material, the characteristics of the sheet-like material, the viscosity of the resin varnish, and the like. .

For example, one-side coating only when it is difficult to impregnate the resin varnish uniformly to the inside of the sheet-like material due to the high processing speed of the sheet-like material, the thin eyes of the sheet-like material, and the high viscosity of the resin varnish. Means may be used, otherwise otherwise impregnated at the outlet without the single-sided coating described above, or dip impregnation under reduced pressure and liquid chamber at the outlet.

In addition, when the single-side impregnation means and the double-side impregnation means are used, the resin varnish penetrates into the inside of the sheet-like material because both sides of the sheet-like material are wetted by coating and impregnating the resin varnish from one side of the sheet-like material first. This is to prevent the voids (unimpregnated parts) from remaining inside the sheet-like material.

The manufacturing method of the present invention and the apparatus used in the implementation of the present invention may be one pressure reducing chamber, and at the outlet of the pressure reducing chamber, the resin varnish is impregnated using a pressure difference inside and outside the pressure reducing chamber. no need. In addition, the vacuum impregnation is carried out continuously, good productivity and excellent workability. As described above, the method for producing a resin-containing sheet-like material according to the present invention and the apparatus used therein continuously supply the sheet-like material to the decompression chamber, and utilize the pressure difference between the outside and the inside at the outlet of the decompression chamber. Since the resin varnish is impregnated with the sheet-like material to be dried outside the decompression chamber, a sufficient amount of the resin varnish is impregnated to the inside of the sheet-like material, whereby a high-quality resin-impregnated sheet-like material without voids can be produced.

As a result, using the resin impregnated sheet-like material thus obtained yields the following effects.

(1) Since there is no unimpregnated portion inside, defects caused by voids or streaks after molding are eliminated, (2) adhesion between layers is improved, so that the penetration of plating solution is reduced, and the reliability of the liquor hole is improved. Since there is no impregnation, molding is possible at low temperatures, and residual stress is reduced, thereby improving dimensional stability.

Claims (14)

Resin impregnated sheet consisting of sheet-like material and resin varnish impregnated with the sheet-like material, wherein the total amount of the resin-free region is less than the expected value, that is, the total area of the resin-free region is less than 0.3% of the total area of the resin-impregnated sheet-like material. Phase material. The resin impregnated sheet-like material according to claim 1, wherein the number of bubbles in the resin free region is less than 500pcs / in ² . The resin-impregnated sheet-like material according to claim 1, wherein the substrate is a glass cloth having a thickness of 0.10 to 0.30 mm and a weight of 100 to 300 g / m 2. A method of producing a resin-impregnated sheet-like material, characterized by impregnating the sheet-like material with resin varnish so that the total area of the resin-free region is less than 0.3% of the total area of the sheet-like material, and then drying the sheet-like material. . 5. The method of claim 4, wherein the impregnating step comprises immersing the sheet-like material in the resin varnish and then compressing the sheet-like material in the bath. 6. The method of claim 5, wherein the impregnating step further comprises the step of leaving in the compressing bath. 5. The method of claim 4, wherein the impregnation step comprises immersing the sheet-like material in the resin bath while maintaining the vacuum. A laminate of laminated resin-impregnated sheet-like material comprising a sheet-like material and a resin varnish impregnated and dried in the sheet-like material, and a laminate of at least metal foil bonded to the resin-impregnated sheet-like material laminated through the resin layer. Metal foil coated laminate. The laminate according to claim 8, wherein the resin layer has a weight of 5 to 100 g / m 2. A laminate of a plurality of laminated resin impregnated sheet-like materials consisting of a sheet-like material and a resin varnish impregnated and dried in a sheet-like material, wherein the total area of the resin-free region of the resin-impregnated sheet-like material is 0.3 of the total area of the sheet-like material. A laminate comprising less than% and laminated resin impregnated sheet-like material is heat compression molded under a pressure of 1 to 40 kg / cm 2. In impregnating the sheet-like material with resin varnish, the sheet-like material is continuously supplied to the decompression chamber, and the resin-like material is impregnated into the sheet-like material at the outlet of the decompression chamber to dry out of the decompression chamber. A method for producing a resin-impregnated sheet-like material, characterized by the above-mentioned. A pressure reducing chamber with means for impregnating resin varnish into the sheet-like material by using a pressure difference between the outside and the inside at the outlet, means for continuously supplying the sheet-like material from the pressure reducing chamber, and sheet-like material from the pressure reducing chamber through the outlet. A device for producing a resin-impregnated sheet-like material, comprising means for continuously drawing out and means for drying the sheet-like material drawn out continuously from the decompression chamber. In impregnating the sheet-like material with resin varnish, the sheet-like material is continuously supplied to the decompression chamber with the resin varnish impregnation means therein, and the sheet-like material is impregnated under reduced pressure, and then the boundary between the outside and the inside of the decompression chamber. A method for producing a sheet-like material, characterized in that the resin varnish is again impregnated using the external and internal pressure at the outlet where the resin varnish is used for drying. From a decompression chamber using resin varnish at the outer and inner boundaries at the outlet, means for continuously supplying sheet-like material to the decompression chamber, means for continuously drawing sheet-like material from the decompression chamber through the outlet, and from the decompression chamber The resin impregnated sheet is provided with a means for drying the sheet-like material continuously drawn out, and a resin impregnation means in the decompression chamber, and the sheet-like material is led through the resin varnish impregnation means and then led to the outlet of the pressure reduction chamber. Apparatus for the production of phase materials.

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