JP2003089967A - Fiber opening method of glass fiber woven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for more effectively opening a glass fiber woven fabric having high fiber opening effect. SOLUTION: This fiber opening method of the glass fiber woven fabric is to heat treat the woven fabric containing water and glass fiber in at least one part of the fabric by a cylindrical dryer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for opening a glass fiber fabric used for printed wiring boards and the like.

[0002]

2. Description of the Related Art In recent years, with the high performance and miniaturization of electric and electronic devices, the characteristics required for printed wiring boards have become more sophisticated.

One of such requirements is improvement of surface smoothness of the surface of the fiber base material. If the surface smoothness is inferior, for example, in the resin impregnation treatment step when manufacturing a prepreg to be a printed wiring board, it becomes difficult for the resin to be uniformly impregnated with the fiber, and when used for a printed wiring board, a conduction hole is formed. Although a hole is made with a drill or the like for manufacturing, there is a possibility that a defect may occur such that the hole is displaced or the hole does not become a perfect circle.

Therefore, in order to improve the surface smoothness,
It is preferable to perform the fiber-opening treatment, and many researches and developments have been conducted on the fiber-opening treatment, and it is expected that a more efficient and high fiber-opening method will appear.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel method for opening a glass fiber woven fabric, which has a high opening effect.

[0006]

Means for Solving the Problems The inventors of the present invention have made extensive studies to solve the above problems. When various conditions for producing the glass fiber woven fabric were examined, it was surprising to heat the glass fiber woven fabric after weaving in a wet state with a cylinder dryer that was conventionally used for warp warping. In particular, the glass fiber woven fabric was opened, and it was discovered that the fiber opening effect was unexpectedly high.

In the case of producing a glass fiber woven fabric, the warp yarns constituting the glass fiber woven fabric are usually subjected to a step called warping treatment before weaving. The warping step is a step performed to paste the warp yarns and facilitate the weaving process.When the warp yarns are dried after the warp yarns are glued, a cylinder dryer is used. ,
It was not used to open the fabric. In the present invention, conventionally, a glass fiber woven fabric was prepared, and after this was opened with a water jet, a vibro washer or ultrasonic waves, the glass fiber woven fabric was dried using a ceramic heater or an infrared heater. It was found that, when dried using a cylinder dryer, surprisingly, the glass fiber woven fabric was further opened by the heat treatment by the cylinder dryer. It has been discovered that, in the conventional method of opening, the weft is easier to open out of the warp and the weft, whereas the heat treatment by the cylinder dryer can particularly open the warp. After further study, the present invention has been completed.

That is, the present invention provides (1) a method for opening a glass fiber woven fabric, which comprises subjecting a woven fabric containing water and at least a part of glass fiber to a heat treatment in a cylinder dryer, (2) The glass fiber is E glass, the method for opening a glass fiber woven fabric according to (1) above, (3) the cylinder dryer is composed of two or more cylinders. 1) or the method for opening the glass fiber woven fabric according to (2), (4) 2
The surface temperature of one or more cylinders is different from each other, and relates to the method for opening a glass fiber woven fabric according to (3) above.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The fiber-spreading method of the present invention is characterized in that a woven fabric containing at least a part of glass fibers is heat-treated in a cylinder dryer. Any form may be used as long as such requirements are satisfied. The preferred embodiments will be described below.

The glass fiber used in the present invention is not particularly limited, but for example, E glass, D glass,
Glass fibers such as T glass, C glass and H glass are mentioned. These glass fibers may be manufactured according to a known manufacturing method, or commercially available products may be used. Among them, E glass fiber is particularly preferable.

The glass fiber woven fabric of the present invention may contain fibers other than glass fibers. For example, there may be mentioned a case where an inorganic fiber such as a carbon fiber or a ceramic fiber, for example, an organic synthetic fiber such as an aromatic polyamide fiber or an aromatic polyester fiber is used as a warp or a weft, and a glass fiber is used as a weft or a warp. For example, when manufacturing a printed wiring board, dimensional stability and heat resistance are required, and therefore it is preferable that fibers other than the glass fibers to be mixed also have dimensional stability and heat resistance.

The warp or weft constituting the glass fiber woven fabric used in the present invention may take any form.
That is, it may be a single fiber (monofilament) or a yarn (also referred to as a strand) obtained by combining a plurality of monofilaments. Particularly in the case of a glass fiber woven fabric, it is preferable to use a yarn obtained by bundling about 50 to 400 monofilaments of glass fiber having a diameter of about 3 to 13 μm.

The warp or weft constituting the glass fiber woven fabric used in the present invention may be twisted. The twist may be either an S twist or a Z twist, and the number of twists is, for example, the twist of a glass thread that is usually used (0.7 to
1.0 twist / inch), that is, the twist number of the glass yarn is 0.5 turn / inch or less, preferably 0.
By setting the number of yarns to 0.3 times / inch, the yarn width is more likely to be widened, and it becomes easy to form a structure in which the adjacent yarns of the warp yarn and the weft yarn are arranged substantially without a gap. Further, by using the low twisted yarn, the yarn is flattened, the cross-sectional shape of the yarn itself approaches an elliptical shape to a flat plate shape, and the distribution of glass fibers in the glass fiber woven fabric becomes more uniform.

The warp formed by drawing a plurality of single fibers together is preferably subjected to a warping process. The warping treatment may be performed according to a known method. As a preferred embodiment of such a method, the method shown in FIG. 1 can be mentioned. For example, the warp F is wound around the warp beam 67 with equal tension according to the number, length, width, etc. of single fibers designed so that a desired glass fiber woven fabric can be produced. The warp yarn F is dipped in the sizing agent 64 in the sizing bath 63, the warp yarn F is pulled out with a constant tension, and the warp yarn F is passed through the sizing agent 64, so that the sizing agent 64 is sufficiently sewn.
Let it soak into it. Then, the excess sizing agent is squeezed out by the squeezing roll 65, dried in the drying section 66, and wound on the weaving roll 68 for weaving the glass fiber woven fabric, thus completing the warping process. A cylinder dryer is usually used for the drying unit 66, but the dryer is not particularly limited.

A glass fiber woven fabric is woven using the obtained warp and weft. The weaving method is not particularly limited, and for example, plain weave, twill weave, twill weave, leno weave, satin weave,
It may be any such as a triaxial weave or a horizontal strip weave.
Of these, plain weave is preferable. The weaving can be easily performed according to a method known per se, for example, using a known loom such as a jet loom (air jet loom, water jet loom), a sulzer loom, or a lepier loom.

The fabric density when weaving the glass fiber fabric is not particularly limited for both warp and weft. However, the density of the woven fabric is about 10 to 60 pieces / 2 because of the opening process performed later.
It is preferably about 5 mm, and more preferably about 30 to 50 lines / 25 mm. The woven fabric density is the number of yarns existing in a 25 mm square glass fiber woven fabric. At the stage of weaving, there is a part called a basket hole, which is surrounded by warp and weft, and does not have glass yarn.However, by performing the opening process, the existence rate of this basket hole becomes low and the woven surface becomes smooth. become. for that reason,
The woven fabric immediately after weaving according to the present invention preferably has a basket hole, and in a woven fabric having a high woven fabric density with almost no basket holes, the yarns constituting the woven fabric are not substantially opened. Therefore, it is not preferable.

The raised fabric immediately after weaving is also called a raw fabric. Raw fiberglass fabric may be used as a raw material for the method of the present invention. In the manufacturing process of a normal glass fiber fabric, for example, a step of removing the sizing agent and the like attached to the greige by a heat cleaning process, an opening step,
A silane coupling step is included, and the steps may be performed in any order, but are often performed in the order described above. The glass fiber woven fabric according to the present invention may have one or more or all of the above steps performed in advance, and the above steps may be performed according to a known method.

The opening step using the cylinder dryer according to the present invention can be performed in any of a raw machine, that is, immediately after the fabric is produced or at the same time as the fabric is produced, before or after heat cleaning, before the opening process, or at the same time. It may be carried out at any stage as long as it is the process for producing a woven fabric. If the order of the silane coupling step is before the opening step, it may be performed immediately before the silane coupling step. Above all, it is preferable to perform the wet heat treatment by a cylinder dryer immediately after the fabric is produced or at the same time as the fabric is produced. Hereinafter, a preferred embodiment will be described.

The cylinder dryer, which is a feature of the present invention, will be described. Unlike the conventional opening method, the opening method using the cylinder dryer according to the present invention is characterized in that the warp can be opened. By subjecting the glass fiber woven fabric to the heating step in a cylinder dryer, the warp yarns are particularly efficiently opened, and the degree of opening varies depending on the conditions, so it cannot be said unequivocally, but it is usually compared with the warp yarns before opening. About 20
The yarn width is expanded by about 50 μm.

The glass fiber woven fabric to be heat-treated in the cylinder dryer according to the present invention is in a wet state, that is, the woven fabric contains water, and the heat treatment is carried out in the cylinder dryer by the cylinder dryer. And both warp and weft,
In particular, the degree of opening of the warp yarn is improved. Therefore, when the glass fiber woven fabric is heat-treated by the cylinder dryer, it is preferable that the woven fabric contains water before the glass fiber woven fabric is heat-treated by the cylinder dryer. As a method of containing moisture in the fabric, for example, a method of passing the fabric through an aquarium,
Examples thereof include a method of leaving it in steam or a method of spraying water on the fabric by spraying. Above all, the method of passing the fabric through the water tank is preferable because of its simplicity. In any case, the heat treatment by the cylinder dryer is preferably applied to the wet fabric. When heat treatment with a cylinder dryer is performed on a wet woven fabric containing water, both warp and weft are efficiently opened, especially because the warp is heat-set while maintaining the opened state. Surface smoothness is improved.

The cylinder dryer may be a known one. For example, if the cylinder dryer used when producing the warp is used, an extra cylinder dryer is not required, which leads to cost reduction. Further, the number of cylinders of the cylinder dryer is not particularly limited,
It is preferable that the number is about 1 to 5. The surface temperature of the glass fiber when heated by a heat treatment with a cylinder dryer is usually about 50 to 180 ° C, preferably about 80 to 150 ° C. Furthermore, when using a plurality of cylinders, all the cylinders may have the same surface temperature, or may have different surface temperatures. When the cylinders have different surface temperatures, it is preferable that the surface temperature of the cylinders gradually increase in the order in which the fabric passes through the cylinder dryer.
As such an example, there is a case where the cylinder surface temperature gradually rises in order from the cylinder through which the woven fabric first passes, for example, 80 ° C, 120 ° C, 150 ° C. In such a case, the warp and the weft are gradually opened.

A preferred embodiment of the method for opening a glass fiber woven fabric according to the present invention will be described with reference to FIG. Figure 2
FIG. 3 is a schematic view showing an embodiment for opening the glass fiber woven fabric according to the present invention.

The glass fiber woven fabric T woven by the desired weaving method is wound on the feed roller 1 after weaving. The wound glass fiber woven fabric T first travels in the water tank A while being wound on the winding roll 5 with a constant tension, and the surface water is lightly squeezed by the squeezing roller B, and then the cylinder rolls 2 to 4 are used. To be dried. The surface temperature of the cylinder dryers 2, 3, 4 is 80 ° C. and 1 in order from 2.
The temperature is 00 ° C and 120 ° C.

The diameter of the cylinder dryer may be any size. Further, as shown in FIG. 2, when using a plurality of cylinders, the diameters of the cylinders may be different. The winding speed of the glass fiber fabric according to the present invention is not particularly limited, but it is preferably about 1 to 700 m / min in order to sufficiently open the warp and the weft.

Further, preferred specific examples of the glass fiber woven fabric to be subjected to the heat treatment using the cylinder dryer of the present invention will be exemplified.

In the present invention, the glass fiber woven fabric which is subjected to the heat treatment by the cylinder dryer may be one which has been subjected to a heating treatment in order to remove the sizing agent and the like. The heating treatment is usually performed after weaving the glass fiber woven fabric. The heating treatment may be performed according to a known method, for example, by leaving it in a heating furnace at about 300 to 400 ° C. for about 1 to 5 days.

Since the glass fiber woven fabric of the present invention has excellent surface smoothness, it is suitable for use in printed wiring boards and the like which are widely used in electric and electronic devices. The method for manufacturing the semiconductor wiring board may be a conventional method, for example, a glass fiber woven fabric is impregnated with a resin such as an epoxy resin and dried by heating to produce a resin-impregnated prepreg. The resin impregnation may be performed according to a known method. A desired number of the resin-impregnated prepregs are laminated appropriately and heated and pressed to produce a printed wiring board. Also, a copper clad laminate can be produced by simultaneously laminating copper foils at the time of heating and pressing.

[0028]

EXAMPLES The present invention will be described in more detail by way of examples. However, it goes without saying that the present invention is not limited to this.

Example 1 and Comparative Example 1 Comparative Example 1 D450 1/0 glass yarn (manufactured by Unitika Glass Fiber Co., Ltd.) was used for the warp and the weft.
Fabric density is 60 yarns / 25mm on warp side, 47 yarns on weft yarn /
A plain weave glass cloth was produced by an air jet loom so as to have a size of 25 mm (IPC: style # 108).
0). The widths of the warp and the weft, and the gaps between the warps and between the wefts were measured.

(Example 1) The glass cloth of Comparative Example 1 was cylinder-dried by using the apparatus shown in FIG. 2 while allowing the glass cloth to contain water and running the glass cloth at a winding speed of 50 m / min. Machine dried. However, the surface temperatures of the cylinder dryers 2, 3 and 4 were 80 ° C, 100 ° C and 120 ° C, respectively. In the same manner as in Comparative Example 1, the yarn width of the warp and the weft and the gaps between the warps and between the wefts were measured. The results are shown in Table 1.

Example 2 and Comparative Example 2 (Comparative Example 2) A glass yarn of E225 1/0 (manufactured by Unitika Glass Fiber Co., Ltd.) was used as a warp and a weft.
Fabric density is 60 yarns / 25mm on the warp side, 58 yarns on the weft side /
A plain weave glass cloth was produced with an air jet loom so as to have a size of 25 mm (IPC: Style # 211).
6). The widths of the warp and the weft, and the gaps between the warps and between the wefts were measured.

(Example 2) The glass cloth of Comparative Example 2 was cylinder-dried by using the apparatus shown in Fig. 2 while allowing the glass cloth to contain water and running the glass cloth at a winding speed of 50 m / min. Machine dried. However, the surface temperatures of the cylinder dryers 2, 3 and 4 were 80 ° C, 100 ° C and 120 ° C, respectively. In the same manner as in Comparative Example 2, the widths of the warp and the weft, and the gaps between the warps and between the wefts were measured. The results are shown in Table 1.

[Example 3 and Comparative Example 3] (Comparative Example 3) A glass yarn of G75 1/0 (manufactured by Unitika Glass Fiber Co., Ltd.) was used for the warp and the weft, and the fabric density was 44 yarns / 25 mm on the warp side. Weft side 33 threads / 2
A plain weave glass cloth was produced with an air jet loom so as to have a size of 5 mm (IPC: style # 7628).
The widths of the warp and the weft, and the gaps between the warps and between the wefts were measured.

(Example 3) The glass cloth of Comparative Example 3 was cylinder-dried by using the apparatus shown in Fig. 2 while allowing the glass cloth to contain water and running the glass cloth at a winding speed of 50 m / min. Machine dried. However, the surface temperatures of the cylinder dryers 2, 3 and 4 were 80 ° C, 100 ° C and 120 ° C, respectively. In the same manner as in Comparative Example 3, the widths of the warp and the weft, and the gaps between the warps and between the wefts were measured. The results are shown in Table 1.

In Table 1, the yarn width is the width of the yarns forming the glass cloth, and the gap is the distance between the yarns, for example, the distance between the warp yarns.

[0036]

[Table 1]

From Table 1, when the glass cloth to which water is applied is dried by a cylinder dryer, it is about 20 to 40 μm.
It was found that the yarns of both warp and weft were opened.

[0038]

The method for opening the glass fiber woven fabric of the present invention comprises:
Since it does not require a special device, it is a useful method that can efficiently open the fabric at low cost.

[Brief description of drawings]

FIG. 1 is a schematic view showing a preferred embodiment of a warping process according to the present invention.

FIG. 2 is a schematic diagram showing a preferred embodiment of the fiber-spreading process according to the present invention.

[Explanation of symbols]

1 Feed roll 2 cylinders 3 cylinders 4 cylinders 5 winding roll 61 Sending section 62 winding section 63 glue bath 64 glue 65 squeeze roll 66 Drying section 67 Warping beam 68 woven roll F warp T glass fiber fabric A water tank B squeezing roller

Continued front page    (72) Inventor Jun Sugiura             2210 Unitika Glass, Tarui-cho, Fuwa-gun, Gifu Prefecture             Fiber Co., Ltd. Tarui Factory F term (reference) 3B154 AA07 AA08 AA13 AA14 AA18                       AB20 BA25 BB12 BC26 BF01                       DA30

Claims (4)

[Claims] 1. A method for opening a glass fiber woven fabric, which comprises heat-treating a woven fabric containing water and at least a part of glass fiber in a cylinder dryer. 2. The method for opening a glass fiber woven fabric according to claim 1, wherein the glass fiber is E glass. 3. The method for opening a glass fiber woven fabric according to claim 1, wherein the cylinder dryer comprises two or more cylinders. 4. The method for opening a glass fiber woven fabric according to claim 3, wherein the surface temperatures of the two or more cylinders are different from each other.