JP2004256971A - Method for winding glass cloth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for capable of winding glass cloth while suppressing the generation of wrinkles. <P>SOLUTION: This method for winding the glass cloth is equipped with an immersion process of bending the traveling glass cloth 12 by bars arranged in liquid and immersing in the liquid, a drying process of drying the immersed glass cloth immersed in the immersion process and a winding process of winding the glass cloth dried in the drying process, and is characterized with that the bars arranged in the liquid in the immersion process are expanding bars 30a, 30b. Since the expanding bars are arranged in the liquid and tension is imparted towards both edge parts on passing through the expanding bars, it is possible to suppress the generation of wrinkles in the glass cloth. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for winding a glass cloth.
[0002]
[Prior art]
Glass cloth is used as a reinforcing material for a prepreg constituting a printed wiring board. Printed wiring boards using prepregs are used for electronic devices and the like, and electronic devices and the like are aimed at miniaturization and high functionality with the advancement of technology in recent years. For this reason, glass cloth for printed wiring boards is also required to be smooth and thin.
[0003]
Usually, the glass cloth is immersed in a silane coupling agent treatment solution, subjected to a surface treatment, and wound up. Further, in the case of a thin glass cloth, the fiber is generally flattened by opening the fiber with a high-pressure water flow or the like (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-11-315446 [0005]
[Problems to be solved by the invention]
By the way, since the glass cloth decreases in rigidity as it becomes thinner, in the step of winding the glass cloth, the glass cloth is immersed in a liquid as in the above-mentioned fiber opening treatment or silane coupling agent treatment. Wrinkles are likely to occur due to strain that tends to shrink in the width direction, that is, the weft direction. The wrinkles are streaked in the direction in which the glass cloth is conveyed (progressed). If a wrinkled glass cloth is used, a product defect may occur. As described above, the generation of wrinkles impairs the smoothness of the glass cloth and may cause a serious problem in the quality of the printed wiring board.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method capable of winding a glass cloth while suppressing generation of wrinkles.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, in the method of winding a glass cloth of the present invention, the advancing glass cloth is immersed in a immersion step in which the glass cloth is bent by a bar arranged in the liquid and immersed in the liquid. A drying step for drying the glass cloth and a winding step for winding the glass cloth dried in the drying step are provided, and the bar arranged in the liquid in the immersion step is an expanded bar. Here, in the liquid means that the expanded bar is sufficiently wetted with the liquid.
[0008]
In this method, in the immersion step, the advancing glass cloth is bent by an expanding bar disposed in the liquid (bent along the outer peripheral surface of the expanding bar) and immersed in the liquid. Therefore, tension is applied to both edges of the glass cloth by the expanded bar. Therefore, it is difficult to generate a wrinkle by suppressing the strain that tends to shrink in the width direction of the glass cloth in the liquid. Then, the glass cloth in which the generation of wrinkles in the immersion step is suppressed can be dried and wound.
[0009]
In the above-mentioned method for winding a glass cloth, it is preferable that the glass cloth is dried by contacting the glass cloth with a heating roller in the drying step.
[0010]
Since the glass cloth that has passed through the liquid is brought into contact with the heating roller and dried, the drying efficiency of the glass cloth is high. Further, in a dry state, the glass fiber bundle easily slips in a dry state and releases strain easily, and wrinkles are less likely to occur as compared to a wet state. For this reason, by drying the glass cloth with the heating roller, it is possible to prevent wrinkles from being generated in the glass cloth during winding or the like.
[0011]
Furthermore, in the glass cloth winding method of the present invention, it is preferable that the glass cloth is advanced in the dipping step so that the tension applied in the direction of advance of the glass cloth per unit width is 10 to 200 N. Here, the unit width means a unit length expressed in meters (m) in the width direction of the glass cloth, that is, in the weft direction.
[0012]
By applying a tension of 10 to 200 N in the traveling direction per unit width of the glass cloth, it is possible to more efficiently suppress the occurrence of wrinkles of the glass cloth in the above-described expanded bar, and further, the above-described range. Since the glass cloth is dried and wound while applying the tension, the glass cloth hardly generates wrinkles in all the steps of winding the glass cloth.
[0013]
Further, on the outer peripheral surface of the above-described expandable bar, a plurality of grooves inclined with respect to the axial direction of the expandable bar are formed symmetrically with respect to a predetermined surface perpendicular to the axis, and when the expandable bar is fixed or When rotating relatively slower than the traveling speed of the glass cloth, place the expanding bar in the liquid so that the groove of the expanding bar facing the glass cloth expands in the traveling direction of the glass cloth. When rotating relatively faster than the moving speed of the cloth, it is desirable to dispose the expanding bar in the liquid such that the groove of the expanding bar facing the glass cloth becomes narrower in the moving direction of the glass cloth. Here, the case where the expanding bar rotates relatively slower than the traveling speed of the glass cloth includes the case where the expanding bar is rotated in the direction opposite to the traveling direction of the glass cloth so as not to hinder the traveling of the glass cloth.
[0014]
When the expanded bar having the groove as described above is fixed, when rotating relatively slower than the traveling speed of the glass cloth, when rotating relatively faster than the traveling speed of the glass cloth, When the expandable bar is arranged as described above, when the outer peripheral surface of the expandable bar is rubbed against and touches the glass cloth as the glass cloth advances, tension is applied to both edges of the glass cloth. Therefore, since the glass cloth is spread in the width direction, it is possible to prevent the occurrence of wrinkles.
[0015]
Furthermore, in the glass cloth winding method of the present invention, in the immersion step, the glass cloth may be subjected to a fiber opening treatment in a liquid.
[0016]
Since the wrinkles are prevented from being generated in the glass cloth by the expanding bar arranged in the liquid, the fiber cloth can be uniformly spread over the entire glass cloth, and the fiber cloth can be efficiently and reliably spread. Can be done.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same reference numerals are used for the same elements, and redundant description will be omitted.
[0018]
FIG. 1 is a schematic configuration diagram of a winding system for winding a glass cloth.
[0019]
The winding system 10 includes a delivery roller 14 around which a glass cloth 12 to be wound is wound, an immersion treatment tank 16 for applying a fiber opening treatment, a silane coupling agent treatment, and the like to the glass cloth 12, and the immersion treatment tank 16. A heating roller 18 for drying the glass cloth 12 that has passed therethrough, a pair of feed rollers 20a and 20b for adjusting the traveling speed of the glass cloth 12, a winding roller 22 for winding the glass cloth 12, a delivery roller 14, and an immersion tank 16 and guide rollers 24a and 24b which are disposed between the immersion tank 16 and the heating roller 18 and support the glass cloth 12, respectively.
[0020]
The rotation axes of the delivery roller 14, the heating roller 18, the feed rollers 20a and 20b, the take-up roller 22, and the guide rollers 24a and 24b are parallel to each other, and the glass cloth 12 is wound thereon.
[0021]
A motor (not shown) is connected as a drive source to the feed rollers 20a and 20b and the take-up roller 22, and the motors rotate in synchronization with each other so that the glass cloth 12 moves in the direction of arrow A in FIG. Is to progress.
[0022]
The glass cloth 12 is wound around the delivery roller 14 as described above. The glass cloth 12 wound around the delivery roller 14 is manufactured by weaving a glass fiber bundle obtained by bundling a plurality of glass fiber filaments with a glass fiber sizing agent as a warp and a weft. In the present embodiment, the glass cloth 12 wound around the delivery roller 14 has a thickness of 40 μm, and is a so-called thin glass cloth. The delivery roller 14 is free to rotate with respect to the rotation axis, and the glass cloth 12 is fed out with the rotation of the take-up roller 22 and the feed rollers 20a, 20b. A brake mechanism (not shown) for controlling the feeding of the glass cloth 12 is attached to the delivery roller 14.
[0023]
The guide roller 24a is disposed between the delivery roller 14 and the immersion tank 16 so as to support the glass cloth 12 from below. A tension detector (not shown) for detecting the tension in the traveling direction of the glass cloth 12 is attached to the guide roller 24a.
[0024]
The treatment liquid 26 is stored in the immersion treatment tank 16, and an opening device 28 for opening the glass cloth 12 may be provided. As the fiber opening processing device 28, for example, a high pressure water shower generator, an ultrasonic generator, a vibrating washer, or the like can be considered. The treatment liquid 26 may be, for example, a silane coupling agent-containing liquid when the silane coupling agent treatment is performed, and may be water or a silane coupling agent-containing liquid when performing the fiber opening treatment.
[0025]
In the immersion tank 16, two expanded bars 30 a and 30 b are arranged and fixed in the processing liquid 26. The expand bars 30a and 30b are attached to the immersion tank 16 so as to be detachable.
[0026]
The expanded bars 30a and 30b will be described with reference to FIG. FIG. 2 is a view taken along the line II-II in FIG. 1, and an arrow A in FIG. 2 indicates the traveling direction of the glass cloth 12. A plurality of grooves 32 are formed at equal intervals on the outer peripheral surfaces of the expand bars 30a and 30b. The groove 32 is inclined with respect to the axial direction of the glass cloth 12, and is formed so as to be symmetric with respect to a predetermined plane perpendicular to the axis, for example, a plane passing through a midpoint between both ends and perpendicular to the axis. As shown in FIG. 2, the expand bars 30 a and 30 b have axes whose axes are substantially perpendicular to the traveling direction of the glass cloth 12 and face the glass cloth 12 (that is, the surfaces that rub against and touch the glass cloth 12) as shown in FIG. 2. A groove 32 is widened in the traveling direction of the glass cloth, and is fixed to the immersion treatment tank 16 so that the outer peripheral surfaces of the expand bars 30a and 30b are rubbed and contacted with the glass cloth 12 as the glass cloth 12 advances. I have.
[0027]
The guide roller 24b is disposed between the immersion tank 16 and the heating roller 18 so as to support the glass cloth 12 from below. The guide roller 24b is also provided rotatably with respect to the rotation shaft. The guide roller 24b has a tension detector (not shown) that detects the tension in the traveling direction of the glass cloth 12.
[0028]
The heating roller 18 can also freely rotate with respect to the rotation axis. The outer peripheral surface of the heating roller 18 is preferably heated to 80 ° C. to 160 ° C. in order to evaporate the processing liquid 26 such as water attached to the glass cloth and to dry the glass cloth. More preferably, it is heated to 120 ° C.
[0029]
The pair of feed rollers 20 a and 20 b are arranged between the heating roller 18 and the winding roller 22. The upstream feed roller 20a is rotated clockwise in FIG. 1 by a motor, and the downstream feed roller 20b is rotated counterclockwise in FIG.
[0030]
As described above, the motor serving as a driving source is connected to the winding roller 22, and rotates in a clockwise direction in FIG. The glass cloth 12 that has passed through the immersion tank 16 and has been dried by the heating roller 18 is wound on the outer peripheral surface of the winding roller 22.
[0031]
In the above configuration, when the motors of the feed rollers 20a and 20b and the winding roller 22 are started, the glass cloth 12 is sent to the winding roller 22 by the feed rollers 20a and 20b, and the winding roller 22 winds the glass cloth 12. Therefore, the glass cloth 12 is pulled out in the direction shown by the arrow A in FIG. The glass cloth 12 fed from the delivery roller 14 is bent by the expand bar 30a in the immersion tank 16 via the guide roller 24a, and advances toward the expand bar 30b while being rubbed by the expand bar 30. Here, “bent” means that the glass cloth 12 bends along the outer peripheral surface of the expanded bar, that is, the glass cloth 12 is in contact with the outer peripheral surface of the expanded bar by a certain area. When the glass cloth 12 bends at the expanded bar 30a in this manner, since the groove 32 is formed on the outer peripheral surface of the expanded bar 30a as described above, the glass cloth 12 is oriented in the direction in which the groove 32 extends (FIG. 2). in the direction of arrow B ₁ and B _2), i.e., the tension towards the edges of the glass cloth 12 is applied through the expanded bar 30a.
[0032]
The glass cloth 12 that has passed through the expanded bar 30a passes through the processing liquid 26 in the immersion processing tank 16 and heads toward the expanded bar 30b (immersion step). Then, it is bent by the expander bar 30b, passes through the outer peripheral surface while contacting the outer peripheral surface thereof, and heads toward the guide roller 24b. In this case, as in the case of expanding bars 30a, tension is applied in the direction (direction of arrow B ₁ and B ₂ in FIG. 2) which extends in the groove 32.
[0033]
In the case where the fiber opening treatment is performed in the immersion treatment tank 16, for example, high-pressure water is blown out of the glass cloth 12 by the fiber opening treatment device 28 with respect to the glass cloth 12 that has passed through the expand bar 30a. An opening process for opening is performed.
[0034]
As described above, the tension detector is attached to each of the guide rollers 24a and 24b, and the brake mechanism is attached to the delivery roller 14. Therefore, the tension in the longitudinal direction of the glass cloth 12 can be detected by the tension detectors of the guide rollers 24a and 24b. Then, in accordance with the detection result, the brake mechanism of the delivery roller 14 is operated to adjust the longitudinal tension of the glass cloth 12. In the present embodiment, the tension, which is the tension per unit width of the glass cloth 12 in the liquid and is applied in the traveling direction of the glass cloth 12, is controlled to be 10 to 200 N. This is because when the tension per unit width is less than 10 N, the tension in the traveling direction is weak and the traveling speed of the glass cloth 12 is slow, and the tension applied to the glass cloth 12 in the width direction by the expandable bars 30 a and 30 b is weak. This is because wrinkles are likely to occur. On the other hand, if the tension per unit width is greater than 200 N, the tension applied to both edges by the expandable bars 30 a and 30 b becomes relatively smaller than the tension in the traveling direction, and wrinkles are generated. is there.
[0035]
The glass cloth 12 that has passed through the guide roller 24b rotates along the outer peripheral surface of the heating roller 18 toward the feed rollers 20a and 20b. Since the surface temperature of the heating roller 18 is heated to 90 ° C. to 120 ° C., the glass cloth 12 is dried by contacting the outer peripheral surface (drying step). The dried glass cloth 12 is wound around the winding roller 22 via the feed rollers 20a and 20b (winding step).
[0036]
When performing the fiber opening treatment or the like in the immersion treatment tank 16 as described above, the glass cloth 12 is immersed in the treatment liquid 26 such as water. When the glass cloth 12 gets wet with a processing liquid such as water, there is a case where a strain to shrink occurs. In the case of the glass cloth 12 used in this embodiment, that is, a so-called thin glass cloth having a thickness of 50 μm or less, the generation of the wrinkles becomes more remarkable because the rigidity is reduced. Since the wrinkled glass cloth 12 has a poor appearance and the smoothness of the glass cloth 12 is impaired, there is a possibility that a product defect may occur in the prepreg.
[0037]
In the present embodiment, in the immersion tank 16, expanded bars 30 a and 30 b having grooves 32 that are inclined so as to expand in the traveling direction of the glass cloth 12 are provided. Therefore, even if the glass cloth 12 is immersed in the processing liquid 26 such as water in the immersion processing tank 16, the glass cloth 12 spreads in the direction in which the groove 32 extends by advancing while being in contact with the expanded bars 30 a and 30 b. Tension is applied as follows. This makes it difficult for the glass cloth 12 to be wrinkled. Since the above-described expanded bars 30a and 30b are used, it is only necessary to dispose the expanded bars 30a and 30b in the processing liquid 26 such as water so as to be in contact with the glass cloth 12, and it is possible to easily prevent the generation of wrinkles. It can be carried out. Further, since tension is applied to the direction in which the grooves 32 extend by the expandable bars 30a, 30b, that is, to both edges of the glass cloth 12, the difference in tension between the warp direction and the weft direction of the glass cloth 12 is obtained. Is small. In such a state, the glass cloth 12 is evenly spread, and the glass cloth 12 is efficiently and reliably opened.
[0038]
Furthermore, since the glass cloth 12 that has passed through the immersion tank 16 is dried by the heating roller 18, the drying efficiency of the glass cloth 12 is good. The glass cloth 12 is less likely to wrinkle in a dry state than in a wet state. Therefore, by drying the glass cloth 12 with the heating roller 18, it is possible to prevent wrinkles from occurring on the subsequent winding and the path to the winding roller 22.
[0039]
Furthermore, as described above, the guide rollers 24a and 24b have a tension detector, and the delivery roller 14 can be brake-controlled. Therefore, if the brake mechanism of the delivery roller 14 is adjusted according to the result of the tension detector, the tension in the traveling direction of the glass cloth 12 can be adjusted. By appropriately adjusting the tension in the traveling direction, the tension applied to the glass cloth 12 by the expandable bars 30a and 30b can be effectively applied, and wrinkles are less likely to occur.
[0040]
As described above, the preferred embodiments of the present invention have been described in detail, but it goes without saying that the present invention is not limited to the above embodiments.
[0041]
For example, in the above-described embodiment, the grooves 32 are formed as the expandable bars 30a and 30b on the outer peripheral surface facing the glass cloth 12 so as to be inclined toward the traveling direction of the glass cloth 12. However, the present invention is not limited to this. Absent. For example, a material in which the above-mentioned groove portion is filled with a material having a different coefficient of friction from the protrusion between the grooves, and the outer peripheral surface is flat may be used. In this case, bands having different friction coefficients are formed so as to spread in the traveling direction of the glass cloth 12. As a result, when the glass cloth 12 passes while contacting the expanded bar, tension is applied to the glass cloth 12 so that the glass cloth 12 spreads in the traveling direction due to a difference in friction coefficient between the bands. Therefore, wrinkles are not easily generated in the glass cloth 12.
[0042]
Further, as shown in FIG. 3, no grooves are formed on the outer peripheral surfaces of the expanded bars 30a and 30b, and the diameter of the central portion between both ends is larger than the diameter of both ends, that is, the central portion between both ends. The expanded bar 34 having a curved shape in which the bulges may be used. In this case, since the glass cloth 12 is bent along the curved shape of the expanded bar 34, the glass cloth 12 is stretched toward both edges, and the wrinkles are extended.
[0043]
Although the expand bars 30a and 30b are assumed to be fixed, they are not limited to being fixed and may be rotated.
[0044]
Here, when the expanding bars 30a, 30b rotate relatively slower than the traveling speed of the glass cloth 12, the grooves 32 of the expanding bar 12 face the glass cloth 12 at a portion facing the glass cloth 12 as in the present embodiment. May be arranged so as to spread in the direction of travel.
[0045]
Further, when the expanding bars 30a, 30b rotate relatively faster than the traveling speed of the glass cloth 12, that is, when the glass cloth 12 is pushed out by the expanding bars 30a, 30b, the grooves 32 of the expanding bars 30a, 30b. May be disposed so as to become narrower in the traveling direction of the glass cloth 12 at a portion facing the glass cloth 12.
[0046]
Furthermore, although two expand bars are used, it is not necessarily limited to two expand bars. For example, one may be used, and three or more may be used. These may be appropriately selected according to the size of the immersion treatment tank and the treatment to be performed on the glass cloth 12, for example, a silane coupling agent treatment.
[0047]
The processing performed on the glass cloth in the immersion processing tank 16 does not need to be limited to the fiber opening processing. For example, a silane coupling agent treatment may be performed as described above. In this case, the immersion tank 16 may be filled with a silane coupling agent-containing liquid. Thus, the liquid to be stored in the processing tank is not limited to water, but may be changed according to the method of processing the glass cloth. For example, in the case of an aqueous processing liquid such as water, warm water, a silane coupling agent-containing liquid, or a resin dispersion liquid, the processing liquid is particularly effective in suppressing wrinkles, but is not limited thereto.
[0048]
Further, the present invention is applicable to a glass cloth having a dipping step, and may be applied to a glass cloth to which a sizing agent is adhered, a glass cloth after deoiling, a glass cloth subjected to a coupling treatment, and the like.
[0049]
Furthermore, each of the guide roller 24b and the heating roller 18 may be an expanded bar.
[0050]
Furthermore, the heating roller 18 is configured to contact only one surface of the glass cloth 12, but, for example, the glass cloth 12 is sandwiched between two heating rollers or the glass cloth 12 is hung on two heating rollers at different levels. Alternatively, both sides may be in contact with the heating roller.
[0051]
【The invention's effect】
According to the present invention, in the immersion step, a tension is applied to the glass cloth passing through the liquid toward both edges by the expanding bar. Since the tension is applied to both edges in this manner, the glass cloth passing through the expand bar is stretched so as to spread to both edges, that is, outward. Therefore, the generation of wrinkles on the glass cloth in the liquid can be suppressed, and the glass cloth in which the generation of wrinkles has been suppressed can be dried and wound in the immersion step as described above.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a glass cloth winding system 10 to which the present invention is applied.
FIG. 2 is an arrow view along the line II-II in FIG.
FIG. 3 is a view showing a modification of the expand bar shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Winding system, 12 ... Glass cloth, 14 ... Discharge roller, 16 ... Immersion processing tank, 18 ... Heating roller, 20a, 20b ... Feed roller, 22 ... Winding roller, 24a, 24b ... Guide roller, 26 ... Treatment liquid, 28: Opening processing apparatus, 30a, 30b: Expanded bar, 32: Groove, 34: Curved expanded bar.

Claims (5)

An immersion step in which the advancing glass cloth is bent by a bar arranged in the liquid and immersed in the liquid,
A drying step of drying the glass cloth immersed in the immersion step,
Winding step of winding the glass cloth dried in the drying step,
A method for winding a glass cloth, wherein the bar disposed in the liquid in the immersion step is an expanded bar. The method according to claim 1, wherein in the drying step, the glass cloth is dried by contacting the glass cloth with a heating roller. 3. The glass cloth according to claim 1, wherein, in the immersion step, the glass cloth is advanced such that a tension applied to the glass cloth in a traveling direction per unit width is 10 to 200 N. 4. Winding method. On the outer peripheral surface of the expandable bar, a plurality of grooves inclined with respect to the axial direction of the expandable bar are formed symmetrically with respect to a predetermined plane perpendicular to the axis,
When the expandable bar is fixed or when rotating relatively slower than the traveling speed of the glass cloth, the groove of the expandable bar facing the glass cloth expands in the traveling direction of the glass cloth. Placing the expandable bar in the liquid,
When the expand bar rotates relatively faster than the traveling speed of the glass cloth, the expand bar is such that the groove of the expand bar facing the glass cloth becomes narrower in the traveling direction of the glass cloth. The method according to claim 1, wherein the glass cloth is disposed in a liquid. The method for winding a glass cloth according to any one of claims 1 to 4, wherein in the immersion step, the glass cloth is subjected to a fiber opening treatment.

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