JP2001269933A - Method of impregnation of resin liquid into basic material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a resin liquid to be impregnated evenly into a base material by lessening the dispersion of an amount of a resin adhering to both sides SOLUTION: By feeding a base material 2, with its lower surface bringing into contact with the resin liquid 1 flowing down being inclined with a prescribed angle, in parallel to the surface of the resin liquid 1, the resin liquid 1 is permeated to the base material from the lower surface. Then the liquid 1 is coated to the upper surface of the base material 2, then, by bringing a liquid-removing roller 3 into contact with the lower side of the material 2, the resin liquid of the lower surface is removed. By removing the resin liquid by the resin-removing roller 3 the adhering amount of which at the lower surface of the base material 2 is apt to become large, the dispersion of the adhering amount at the both sides of the base material 2 can be lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for impregnating a substrate with a resin liquid when preparing a resin-impregnated substrate used for manufacturing a laminate.

[0002]

2. Description of the Related Art A resin-impregnated base material used for manufacturing a laminated board is manufactured by impregnating a base material such as a glass cloth with a resin liquid of a thermosetting resin such as an epoxy resin.

[0003] In preparing a resin-impregnated base material, a method of impregnating the base material with a resin solution is to use a long base material and dip the base material into the resin solution while continuously feeding the base material. Although the dipping method is generally used, such a dipping method has a problem in that air is trapped in the inside of the base material, which becomes bubbles and unimpregnated portions tend to remain.

Therefore, there has been provided a kiss coating method in which one surface of a substrate is brought into contact with the outer peripheral surface of a kiss roll, and a resin liquid is applied to one surface of the substrate by the kiss roll. In the kiss coating method, since the resin liquid permeates from one surface of the base material and is impregnated, it is possible to prevent air from being trapped inside the base material. However, even in this kiss coating method, since the kiss roll is in contact with one surface of the base material at a predetermined kiss pressure, the resin liquid is pushed into the other surface of the base material by this kiss pressure and flows around. The liquid may trap air in the substrate, and it is difficult to completely eliminate the unimpregnated portion.

[0005] To this end, the present applicant has proposed a method of impregnating a resin liquid from one side of a substrate without applying a pressure such as a kiss pressure in Japanese Patent Application Laid-Open No. 9-248823.
As shown in FIG. 5, the resin liquid 1 flows down on the upper surface of a plate pan 10 inclined at a predetermined angle, and the lower surface of the substrate 2 is fed while the substrate 2 is fed in parallel with the plate pan 10. The resin liquid 1 is made to penetrate and impregnate the base material 2 from the lower surface by being brought into contact with the base material 2. In this case, when the resin liquid 1 permeates the base material 2 from the lower surface, no pressure acts on the base material 2, so that air is not trapped in the base material 2, The material 2 can be impregnated with the resin liquid 1.

[0006]

Since the air is not trapped in the substrate 2 in this manner, the unimpregnated portion of the resin liquid 1 into the substrate 2 can be eliminated. Since the resin penetrates into the material 2 from the lower surface, the resin adhesion amount is large on the lower surface side of the substrate 2 and decreases on the upper surface side of the substrate 2, and the variation in the resin adhesion amount on both surfaces of the substrate 2 becomes large. there were. As described above, when the variation in the resin adhesion amount on both sides of the base material 2 is large, a resin-impregnated base material having different resin contents on both sides is produced, and a stable quality laminated board can be manufactured. There is a possibility that problems such as inability to do so may occur.

Therefore, the resin liquid 1 is impregnated into the base material 2 as described above, and then the resin liquid 1 is applied to the upper surface of the base material 2 to reduce the variation in the amount of resin adhesion on both surfaces of the base material 2. In order to reduce the size, see Japanese Patent Application Laid-Open No. H11-277534.
This is done in the official gazette. However, the resin liquid 1 applied to the upper surface of the substrate 2 easily penetrates the substrate 2 by its own weight and sinks to the lower surface side of the substrate 2, and the amount of resin on the lower surface side of the substrate 2 tends to increase. Therefore, in this case as well, it is difficult to reduce the variation in the amount of resin adhesion on both surfaces of the base material 2.

[0008] The present invention has been made in view of the above points, and is intended to reduce the variation in the amount of adhered resin on both surfaces and to uniformly impregnate the substrate with the resin liquid. It is an object to provide an impregnation method.

[0009]

According to a first aspect of the present invention, there is provided a method of impregnating a base material with a resin liquid, wherein the base material is brought into contact with the liquid surface of the resin liquid 1 flowing down at a predetermined angle. The material 2 is sent in parallel to the liquid surface of the resin liquid 1 to allow the resin liquid 1 to permeate the base material 2 from the lower surface, and then the resin liquid 1 is supplied and applied to the upper surface of the base material 2, It is characterized in that the resin liquid 1 on the lower surface is removed by bringing the resin dropping roll 3 into contact.

According to a second aspect of the present invention, in the first aspect, the winding angle of the base material 2 around the resin removing roll 3 is set to 90 degrees.
° or less.

According to a third aspect of the present invention, in the first or second aspect, the application of the resin liquid 1 to the upper surface of the substrate 2 is performed by an application roll 4 disposed on the upper surface side of the substrate 2. It is characterized in that a resin dropping roll 3 is arranged on the lower surface of the substrate 2 so as to face the roll 4 and the resin liquid 1 on the lower surface is removed.

According to a fourth aspect of the present invention, in the third aspect, the resin dropping roll 3 is rotated in synchronization with the coating roll 4 at the same speed.

According to a fifth aspect of the present invention, there is provided a method for impregnating a base material with a resin liquid while the lower surface is in contact with the liquid surface of the resin liquid flowing down at a predetermined angle. The resin liquid 1 is permeated from the lower surface into the base material 2 by sending the resin liquid 1 from the lower surface, and immediately thereafter, the resin dropping roll 3 is brought into contact with the lower surface of the base material 2 to remove the resin liquid on the lower surface. Things.

[0014]

Embodiments of the present invention will be described below.

FIG. 1 shows an example of an embodiment of the present invention. A plate pan 10 is arranged to be inclined at a predetermined angle of 90 ° or less, and a supply tank 11 is provided at an upper end of the plate pan 10. However, a receiving tank 12 is integrally provided at the lower end of the plate pan 10. The inclination angle of the plate pan 10 is preferably in the range of 10 to 70 °, more preferably 25 to 60 °, and most preferably 30 to 45 °. The resin liquid 1 is supplied to the supply tank 11 from the inflow port 13 at a predetermined constant flow rate. The resin liquid 1 thus supplied to the supply tank 11 overflows from the supply tank 11, and the overflowed resin liquid 1 It flows into the inclined upper surface of the plate pan 10 from its upper end, flows down, and flows into the receiving tank 12 from its lower end. The resin liquid 1 flowing into the receiving tank 12 flows out of the outlet 14, but is circulated to the supply tank 11.

The resin liquid 1 can be used without any particular limitation as long as it is a liquid used in the production of a laminated board. A varnish of a thermosetting resin, for example, epoxy resin, phenol Resins, polyimide resins, melamine resins, and varnishes of radical polymerization type thermosetting resins can be used. The radical polymerization type thermosetting resin is a resin in which the curable resin contains a radically polymerizable double unsaturated group and is cured by a radical polymerization reaction of the unsaturated group, and is an unsaturated polyester, epoxy acrylate resin, diallyl phthalate resin. , Vinyl ester resin, polyester acrylate resin, urethane acrylate resin, spirane resin and the like. Further, in the present invention, a crosslinking monomer such as a styrene monomer or a polymerization initiator can be blended and used as a crosslinking agent in the resin liquid 1, and further, an inorganic filler (for example, silica or calcium carbonate), A solvent for adjusting the viscosity of the resin composition or liquefying (for example, ketones such as acetone, alcohols such as methanol, and amides such as N, N-dimethylformamide) can be used.

On the other hand, in the present invention, the substrate 2 is not particularly limited as long as it is used for manufacturing a laminated board. For example, inorganic fibers such as glass fiber and ceramic fiber, polyester fiber, polyamide Cloths, papers, mats, and the like using organic fibers such as fibers, polyacrylic fibers, and polyimide fibers, and natural fibers such as cellulose fibers and cotton can be used. The yarn constituting the base material may be a monofilament yarn or a multifilament yarn. In particular, when a substrate composed of a multifilament yarn is applied to the method of the present invention, the resin liquid 1 is filled not only in the relatively large voids between the yarns but also in the relatively fine voids between the filaments constituting the yarn. It is more advantageous because it can be impregnated.

The substrate 2 is formed in a continuous strip-like shape and is always fed at a predetermined constant speed.
Then, the base material 2 is stretched between the upper surface of the feed roll 18 disposed above the inclination of the plate pan 10 and the lower surface of the application roll 4 disposed below the inclination of the plate pan 10, and Pan 10 above
The gap between the substrate 2 and the plate pan 10 is set so as to be substantially equal to the liquid thickness of the resin liquid 1 flowing down the upper surface of the plate pan 10. .

A resin liquid supply tank 15 is provided above the application roll 4, and a discharge port 16 at the lower end of the resin liquid supply tank 15 is arranged to face the outer peripheral surface of the application roll 4.
The resin liquid supply tank 15 is supplied with the resin liquid 1. The resin liquid 1 supplied to the resin liquid supply tank 15 is discharged from the discharge port 16 to the outer peripheral surface of the application roll 4. is there. As the resin liquid 1, it is preferable to use the same resin liquid 1 flowing down on the upper surface of the plate pan 10.

In this case, when the substrate 2 is fed as shown by an arrow in FIG. 1 while the resin liquid 1 is caused to overflow from the supply tank 11 and flow down the upper surface of the plate pan 10, Makes contact in parallel with the liquid surface of the resin liquid 1 on the plate pan 10, and the resin liquid 1 permeates into the base material 2 from the lower surface thereof. Since the upper surface of the substrate 2 on the side opposite to the side in contact with the resin liquid 1 is in a free state in which it does not contact, if the resin liquid 1 penetrates from the lower surface of the substrate 2, when the resin liquid 1 penetrates, The air in the base material 2 is expelled from the upper surface, and the resin liquid 1 can be impregnated in the base material 2 without air remaining in the base material 2.

In addition, the lower surface of the substrate 2 is only in contact with the liquid surface of the resin liquid 1, and the resin liquid 1 penetrates from the lower surface to the upper surface of the substrate 2 by capillary action. Since the pressing force as in the case of the kiss coat method using the liquid is not applied, the resin liquid 1 is not pushed into the upper surface side of the base material 2 and goes around. This prevents air from being trapped in the base material 2 and allows the unimpregnated portion to be completely eliminated.

When the substrate 2 is impregnated with the resin liquid 1 as described above, the resin liquid 1 penetrates into the substrate 2 from the lower surface. Lumber 2
As shown in FIG. 2A, the amount of the resin liquid 1 adhered on the upper and lower surfaces of the base material 2 which has decreased on the upper surface side of the plate pan 10 greatly varies (see 2a in FIG. 2). Indicates a fiber constituting the base material 2). Then, the resin liquid 1 supplied to the outer peripheral surface of the application roll 4 from the discharge port 16 of the resin liquid supply tank 15 is transferred to the upper surface of the substrate 2, and the upper surface of the substrate 2 immediately after passing over the plate pan 10. Resin liquid 1
2B, so that the amount of the resin liquid 1 deposited on the upper and lower surfaces of the substrate 2 is made uniform, as shown in FIG. 2B.

As described above, even if the resin liquid 1 is applied to the upper surface of the base material 2 to make the amount of adhesion on both upper and lower surfaces uniform, the resin liquid 1 on the upper surface side of the base material 2 causes the base material 2 to go to a drying step. While sending horizontally,
By passing between the fibers 2a of the base material 2 by its own weight, it sinks to the lower surface side of the base material 2, and the amount of resin on the lower surface side of the base material 2 increases as shown in FIG. This tendency is particularly large in the case of a thin substrate 2. Therefore, in the present invention, the resin dropping roll 3 is disposed on the downstream side of the application roll 4 in the feed direction of the substrate 2,
The base material 2 is sent while the lower surface thereof is in contact with the outer periphery of the resin dropping roll 3. By bringing the lower surface of the substrate 2 into contact with the outer periphery of the resin dropping roll 3 in this manner, a part of the resin liquid 1 adhering to the lower surface of the substrate 2 is removed so as to be transferred to the outer peripheral surface of the resin dropping roll 3. As shown in FIG. 2 (d), the amount of the resin liquid 1 attached to the upper and lower surfaces of the substrate 2 can be made uniform.

Here, the direction of rotation of the resin dropping roll 3 is not particularly limited, but the resin liquid 1
When the removal amount of the resin is increased, it is preferable to set the reverse direction in which the feeding direction of the base material 2 and the rotation direction of the upper surface of the resin dropping roll 3 are opposite. Further, the angle (embrace angle) θ of the winding of the substrate 2 around the outer periphery of the resin dropping roll 3 is shown in FIG.
It is preferable to set the angle in the range of 0 to 90 ° as described above. When the wrapping angle θ exceeds 90 °, the resin liquid 1 on the lower surface of the substrate 2 is pushed by the resin dropping roll 3 and comes off to the upper surface side of the substrate 2, and conversely, the resin liquid on the upper surface side of the substrate 2 The attached amount of the liquid 1 may be larger than that on the lower surface side, and the attached amount may be non-uniform.

FIG. 3 shows another embodiment of the present invention, in which a resin dropping roll 3 is disposed immediately below the above-mentioned coating roll 4, and a substrate 2 is coated with a coating roll 4 and a resin dropping roll 3. It is made to pass between. The resin removal roll 3
The application roll is synchronized with the rotation drive of the application roll 4, that is, so that the rotation direction of the upper surface of the resin dropping roll 3 is the same as the rotation direction of the lower surface of the application roll 4 (same as the feed direction of the base material 2). The substrate 2 is driven to rotate at the same rotational speed as that of the substrate 4, so that the substrate 2 can be sent out from between the application roll 4 and the resin dropping roll 3, and the substrate 2 can be transported.

Also in this case, a part of the resin liquid 1 adhering to the lower surface of the base material 2 can be removed by transferring it to the outer peripheral surface of the resin dropping roll 3 as shown in FIG. As shown in d), the amount of the resin liquid 1 adhering to the upper and lower surfaces of the substrate 2 can be made uniform.

FIG. 4 shows another example of the embodiment of the present invention. In this embodiment, a resin dropping roll is provided on the lower side of the plate pan 10 without using the resin supply tank 15 and the coating roll 4. 3 are arranged. And plate bread 1
When the base material 2 impregnated with the resin liquid 1 is brought out from the plate pan 10 by bringing the lower surface into contact with the liquid surface of the resin liquid 1 flowing down the upper surface of the base material 2, the lower surface of the base material 2 A portion of the resin liquid 1 that comes into contact with the outer peripheral surface of the dropping roll 3 and adheres to the lower surface of the base material 2 can be removed by being transferred to the outer peripheral surface of the resin dropping roll 3;
This makes it possible to equalize the amount of the resin liquid 1 adhering to the upper and lower surfaces of the substrate 2.

[0028]

As described above, the method for impregnating a base material with a resin liquid according to the first aspect of the present invention is characterized in that the base material is brought into contact with the liquid surface of the resin liquid flowing down at a predetermined angle. Is fed in parallel with the liquid surface of the resin liquid to allow the resin liquid to penetrate the base material from the lower surface, then supply and apply the resin liquid to the upper surface of the base material, and contact the resin dropping roll to the lower surface of the base material to bring the lower surface into contact. Because the resin liquid is removed, the resin liquid that increases the amount of adhesion on the lower surface of the substrate can be removed with a resin dropping roll, reducing the variation in the amount of resin adhesion on both surfaces of the substrate. The substrate can be uniformly impregnated with the resin liquid.

According to a second aspect of the present invention, in the first aspect, the winding angle of the base material around the resin removing roll is set to 90 ° or less, so that the resin liquid on the lower surface of the base material is removed by the resin removing roll. It is possible to prevent the resin liquid from being unevenly attached to the upper and lower surfaces of the substrate without being pushed and falling off to the upper surface side of the substrate.

According to a third aspect of the present invention, in the first or second aspect, the application of the resin liquid 1 to the upper surface of the base material is performed by a coating roll disposed on the upper surface side of the base material. A resin dropping roll is placed on the lower surface of the substrate to remove the resin liquid on the lower surface, so that the resin liquid can be applied to the upper surface of the substrate with an application roll and the resin on the lower surface of the substrate at the same time. The liquid can be removed with a resin dropping roll, and the variation in the amount of resin adhered to both surfaces of the substrate can be reduced, so that the substrate can be uniformly impregnated with the resin liquid.

According to a fourth aspect of the present invention, in the third aspect, the resin dropping roll is rotated and driven at the same speed in synchronization with the application roll. The base material can be fed using a resin dropping roll for removing the resin liquid on the lower surface of the base material.

In the method for impregnating a base material with a resin liquid according to a fifth aspect of the present invention, the base material is brought into contact with the liquid surface of the resin liquid while the lower surface is in contact with the liquid surface of the resin liquid flowing down at a predetermined angle. The resin liquid penetrates the base material from the lower surface by sending it in parallel with the base material. Part of the resin liquid can be removed with a resin dropping roll, and the amount of resin liquid adhering to the upper and lower surfaces of the base material can be made uniform.

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of the present invention,
(A) is a schematic sectional view, (b) is a partial front view.

FIG. 2 shows a state in which a substrate is impregnated with a resin liquid,
(A) to (d) are enlarged cross-sectional views.

FIG. 3 is a schematic sectional view showing another example of the embodiment of the present invention.

FIG. 4 is a schematic sectional view showing another example of the embodiment of the present invention.

FIG. 5 is a schematic sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin liquid 2 Substrate 3 Resin removal roll 4 Coating roll

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Miku Sugawa 1048 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Works, Ltd. (reference) 4F072 AA04 AB02 AB08 AB09 AB28 AB29 AD08 AD09 AD13 AD21 AD23 AD45 AG03 AH02 AH16 AH17 AH22 AH25 AH26 AH41 AH42 AH53 AL12

Claims (5)

[Claims] 1. A substrate is fed in parallel with a liquid surface of a resin liquid while the lower surface is in contact with a liquid surface of a resin liquid flowing down at a predetermined angle to allow the resin liquid to permeate the lower surface from the lower surface. A method for impregnating a base material with a resin liquid, comprising supplying and applying a resin liquid to an upper surface of the base material, and bringing a resin dropping roll into contact with the lower surface of the base material to remove the resin liquid on the lower surface. 2. The method for impregnating a base material with a resin liquid according to claim 1, wherein the winding angle of the base material around the resin dropping roll is set to 90 ° or less. 3. The application of the resin liquid on the upper surface of the substrate is performed by a coating roll disposed on the upper surface side of the substrate, and a resin dropping roll is disposed on the lower surface of the substrate opposite to the application roll. The resin liquid on the lower surface is removed.
The method for impregnating a base material with a resin liquid according to the above. 4. The method of impregnating a base material with a resin liquid according to claim 3, wherein the resin dropping roll is rotated in synchronization with the application roll at the same speed. 5. A substrate is fed in parallel with the liquid surface of the resin liquid while the lower surface is in contact with the liquid surface of the resin liquid flowing down at a predetermined angle to allow the resin liquid to permeate the lower surface from the lower surface. A method for impregnating a base material with a resin liquid, comprising immediately contacting a resin dropping roll with the lower surface of the base material to remove the resin liquid on the lower surface.