JP4201680B2 - Glass cloth processing method - Google Patents

Description

  The present invention relates to a method for processing a glass cloth used in a printed wiring board used in the electronic / electric field.

  Combined with the development of chip size packages (hereinafter referred to as CSP) and ball grid arrays (hereinafter referred to as BGA) and the development of build-up printed wiring board technology that enables them to be stacked on printed wiring boards, digital Miniaturization and weight reduction of portable devices have been progressing rapidly in recent years. However, CSP and BGA packages are very susceptible to thermal stress due to the difference in coefficient of thermal expansion between the device and the substrate because the lead connection between the device and the substrate is very short. In particular, when the difference in the coefficient of thermal expansion is large in the XY plane direction of the package, it is known that the thermal stress applied to the connection portion described above becomes large and adversely affects connection reliability.

One of the causes of the difference in thermal expansion coefficient in the XY plane direction of the package is XY of the thermal expansion coefficient of the substrate due to the difference in the glass amount and shape in the vertical direction and the horizontal direction of the glass cloth constituting the substrate. Existence of in-plane differences. In order to solve this problem, the glass cloth has little anisotropy in the XY plane, that is, the amount of glass in the vertical and horizontal directions is uniform, the waviness of the yarn is uniform, and the yarn is widened uniformly. There is a need for a simplified version. Specifically, attempts have been made to achieve the above-mentioned uniformity by optimizing the weave density with respect to the amount of glass and improving the anisotropy by processing into glass cloth with respect to the waviness and widening state of the yarn. (Hereinafter, processing that changes the waviness / widening state of the yarn by applying physical external force is referred to as “physical processing”).
As the above-mentioned physical processing, a rotating cylinder having a structure in which a liquid pressure outlet is arranged in water and having a liquid pressure outlet arranged side by side is provided, and a glass cloth is pressed against the rotating cylinder so that pressure is applied from the liquid pressure outlet. There have been proposed a vibratory oscher method (see Patent Document 1) in which a glass cloth is physically processed by the discharged liquid and pressing on the rotating cylinder (see Patent Document 1) or a method in which the glass cloth is simply pressed against the rotating cylinder (Patent Document 2). reference). However, when these physical processing methods are used, the weft yarn is sufficiently widened, but the warp yarn is insufficiently widened due to the tension acting in the warp direction of the glass cloth during physical processing. There has been a problem that non-uniformity of the widening state of the sheet occurs.

In view of such a problem, a method has been proposed in which the above-described physical processing is performed under conditions where tension is not exerted as much as possible in the warp yarn direction (see Patent Document 3). Patent Document 3 does not describe in which range the tension should actually be set, but the open rate of the warp yarn disclosed in the examples is 61.0-73.4%, and the open rate of the weft yarn From 97.2 to 99.8%, warp yarns are only insufficiently widened compared to weft yarns. That is, it can be seen that the tension in the warp yarn direction is too large.
By holding the glass cloth on the surface of the belt conveyor and transporting it, it is possible to achieve a state where neither the warp yarn nor the weft yarn is under tension, but if there is a completely tension-free state, Another problem arises in that quality degradation such as misalignment and bending of the glass cloth occurs due to processing.
As one of physical processing methods, a method of performing physical processing using an ultrasonic transducer is known (see Patent Document 4). However, the method described in Patent Document 4 is a glass cloth surface treatment method, and a sufficient widening effect cannot be obtained under the described conditions. Moreover, since the ultrasonic vibrator is in contact with the glass cloth, there is a concern that the quality may be lowered.

Japanese Patent No. 2511322 Japanese Patent Laid-Open No. 11-330612 JP 2002-038367 A Japanese Patent Publication No. 07-084703

  An object of the present invention is to provide a method for processing a glass cloth that is less likely to bend and that can sufficiently widen a warp yarn and a weft yarn.

As a result of intensive studies to solve the above problems, the present inventors have found that the above problems can be solved by performing physical processing under a constant low tension.
That is, this invention is invention of the processing method of the following glass cloth.
(1) A method of processing a glass cloth, in which a woven glass cloth has a tension of 1.5 × 10 ^{−4 to} 6 × 10 ⁻³ N per warp yarn constituting the glass cloth. And applying at least one physical processing selected from the group consisting of processing by pressure by water flow, processing by high-frequency vibration using a liquid as a medium, processing by pressurization by a roll, and processing by ultrasonic waves, and drying. A processing method of a glass cloth characterized by the above.
(2) physical processing 10N / cm ² ~1000N / processing methods glass cloth (1) above, wherein the pressure in the range of cm ^2, which is a physical process using water having.
(3) The method for processing a glass cloth according to (1) above, wherein the physical processing is physical processing using ultrasonic waves generated by an ultrasonic vibrator that vibrates at a frequency in the range of 10 kHz to 100 kHz.
(4) The woven glass cloth is subjected to physical processing and dried so that the tension applied to one weft yarn constituting the glass cloth is in the range of 1.5 × 10 ^{−4 to} 6 × 10 ⁻³ N. The method for processing a glass cloth according to any one of (1), (2), and (3) above,

  According to the glass cloth processing method of the present invention, it is possible to provide a glass cloth processing method in which the occurrence of bending is small and the warp yarn and the weft yarn can be sufficiently widened.

  The glass cloth used in the present invention is preferably processed in a state in which a lubricant applied to the glass yarn is attached during weaving (hereinafter referred to as “green machine”). The lubricant contains a glass fiber sizing agent such as starch or resin as an essential component, and may contain components such as an oil agent or a softening agent. 0.1-5 mass% is preferable with respect to the mass of the whole glass cloth, and, as for the application quantity of a lubricant, 1-4 mass% is more preferable.

In general, when a glass cloth is physically processed, tension is applied to move the glass cloth in the vertical direction because it is continuously performed by interposing a roll for conveyance before and after the apparatus for performing the physical processing. . When this tension is high, the movement of the monofilament constituting the warp yarn is limited, and sufficient warp yarn widening cannot be achieved. On the contrary, the weft can be sufficiently widened because there is no influence of tension. For this reason, the widened state of the warp yarn and the weft yarn is different, resulting in an unbalanced fabric structure. From this problem, in order to sufficiently and uniformly physically process the warp yarn and the weft yarn, it is necessary to remove the influence of the hindering tension. For this reason, it is preferable that no tension is applied during physical processing.
However, when physical processing is performed completely under no tension, fluttering occurs in the processed glass cloth. In addition, there is a problem that the glass cloth moves obliquely during the transition to the glass cloth, resulting in performance degradation in terms of quality such as misalignment, bending, and wrinkles. The physical processing in is not optimal for practical use.

As a result of intensive studies, the present inventors have found a processing method in which warp yarns and weft yarns are sufficiently and uniformly widened, and quality such as bending is maintained without problems.
That is, the tension at the time of physical processing in order to ensure that the warp yarn and the weft yarn are sufficiently and uniformly opened and the quality such as misalignment is maintained without any problem is applied to each warp yarn constituting the glass cloth. The working tension is preferably in the range of 2 × 10 ⁻⁵ to 2 × 10 ⁻² N, more preferably in the range of 1.5 × 10 ^{−4 to} 6 × 10 ⁻³ N, Most preferably, it is in the range of 3 × 10 ^{−4 to} 3 × 10 ⁻³ N. In physical processing under a tension of less than 2 × 10 ⁻⁵ N, sagging or the like occurs in the glass cloth, and quality deterioration occurs. Further, in physical processing under a tension higher than 2 × 10 ⁻² N, the warp yarn is not sufficiently widened, resulting in a woven fabric structure having a poor balance between warp and width. Here, “a widened state is sufficient” means that the interval between adjacent yarns is within 20 times the average diameter of monofilaments constituting the yarn. More preferably, the interval between adjacent yarns is widened to within 10 times the average diameter of the monofilament.

In addition, since it is not necessary to apply tension to the weft yarn for conveyance, in the prior art, no tension was applied to the weft yarn during physical processing. However, in order to achieve the purpose of sufficiently widening the warp yarn and the weft yarn, it is preferable to give the warp yarn the same tension as the warp yarn. Accordingly, it is preferable that the processing tension per weft yarn constituting the glass cloth is in the range of 2 × 10 ⁻⁵ to 2 × 10 ⁻² N, and 1.5 × 10 ^{−4 to} 6 ×. more preferably within 10 ^-3 N range, and most preferably in the range of ^{3 × 10 -4 ~3 × 10 -3} N. Further, the ratio of the tension per warp yarn to the tension per weft yarn during processing is preferably 0.25 to 4.0, more preferably 0.5 to 2.0, and 0.8 to 1.2 is particularly preferred.

  The tension applied to the glass cloth during physical processing is preferably measured by a tension detection method using a tension detector generally used in the film field. In this tension detection method, two guide rolls and a tension detection roll are arranged at the apex of an isosceles triangle so as to be bilaterally symmetrical, and the glass cloth passes through the guide roll 1, the tension detection roll, and the guide roll 2 in this order. Set to. In the tension detection roll, the tension acting on the guide roll 1 side, the tension acting on the guide roll 2 side, and the resultant force of gravity acting on the tension detection roll act as a load below the tension detection roll. The tension can be obtained by calculation from the measured value of the load sensor set below.

  As a method of giving the above-mentioned range of tension to the warp yarn of the glass cloth during physical processing, the tension in the warp yarn direction is constantly monitored by the above-described tension detector, and the rotational speed of the drive roll arranged before and after the processing step is tensioned. A method of controlling by a control device can be preferably used. When the tension is high, the tension control device operates to slow down the rotation of the front drive roll in the traveling direction and speed up the rotation of the rear drive roll. When the tension is low, the tension control device The tension in the warp yarn direction is controlled by operating so as to speed up the rotation and slow down the rotation of the driving roll behind. Moreover, when conveyance with a lower tension is required, a method of conveying while applying a low tension with a driving roll while holding the glass cloth on the surface with a net-like conveyor can be suitably used.

  A tenter method can be suitably used as a method of applying a tension in the above-described range to the weft yarn of the glass cloth during physical processing. In the tenter method, a certain tension is applied in the weft direction by sandwiching both ends in the weft direction with tenter clips. By attaching the tenter clip to the glass cloth before the processing step and removing it from the glass cloth after the processing step, a constant tension can be applied in the weft direction during physical processing. However, since it is difficult to constantly monitor the tension in the weft direction, the tension applied to the glass cloth by the tenter clip needs to be measured offline.

Examples of the physical processing of the glass cloth include processing by pressure using a water flow, processing by high-frequency vibration using a liquid as a medium, processing by pressurization using a roll, processing by ultrasonic waves, and the like. The present inventors have made extensive studies on a processing method suitable for the physical processing under constant low tension, physical processing with water having a pressure in the range of ^{10N / cm 2 ~1000N / cm 2} , or, in 10kHz~100kHz We have found that physical processing with ultrasonic waves generated by an ultrasonic transducer that vibrates at a range of frequencies is preferred.
As the above-described physical processing method using water flow, spray processing or columnar flow processing is preferable.

  Spray processing is physical processing performed by a high-pressure water spout injected from a nozzle having a spread angle. The nozzles used for spraying are roughly divided into fan-shaped nozzles, uniform fan-shaped nozzles, full-cone nozzles, and empty-cone nozzles. However, fan-shaped nozzles or uniform fan-shaped nozzles are preferable for widening the filaments and the weaving intersections in the yarn bundle. . When a full conical nozzle is used, the amount of water sprayed onto the glass cloth is significantly different between the lower part of the nozzle and the end of the sprinkling flow, so misalignment occurs in the glass cloth due to the high-pressure water concentrated immediately below the nozzle. There is a fear. Moreover, when an empty conical nozzle is used, the impact force with respect to the amount of water to be sprayed is significantly lower than that of a sector nozzle, so that the efficiency of physical processing is reduced.

For spraying, a nozzle with a spread angle in the range of 10 to 150 ° is preferable, but a nozzle with a spread angle in the range of 50 ° to 110 ° is more preferable. For nozzles with a divergence angle of less than 10 °, the degree of widening of filaments and weaving intersections in the yarn bundle is small, and for nozzles greater than 150 °, the distance from the center of the nozzle to the end of the sprinkling flow becomes extremely long, and The impact force at the time of colliding with the cloth is remarkably different between the nozzle center and the sprinkling flow spreading end.
The nozzle array used for the spray process is preferably a staircase array such as a staggered array, an irregular staggered array, or a combination of a staggered array and a constant angle tilt array. The nozzles are preferably arranged at a certain angle with respect to the width direction of the glass cloth, for example, about 5 to 10 ° from the direction perpendicular to the glass cloth and parallel to the width direction of the glass cloth.
The arrangement pitch of the nozzles is appropriately adjusted depending on the spread width of the high-pressure water spray, the distance from the nozzle to the glass cloth, the degree of overlap between the adjacent high-pressure water streams, and the like.

  The columnar flow processing is a physical processing method performed by columnar flow high-pressure water ejected from a nozzle group having pores having a diameter of 0.1 to 0.5 mm. As the nozzles used for the columnar flow processing, linear nozzles and plate nozzles arranged in large numbers independently are preferably used. Generally, the nozzles having a water flow spread angle of 0 °, which are generally called linear nozzles, are independently used. A large number of nozzles having pores can also be arranged. If these nozzles are arranged in one row, it will be difficult to uniformly spray columnar flow high-pressure water over the entire surface of the glass cloth. Therefore, the nozzle groups should be arranged with the positions in the width direction shifted over a plurality of rows. Is preferred. Further, for the purpose of preventing localization of the impact force of the spray water with respect to the glass cloth, it is preferable to swing or circularly move the nozzle group itself.

The pressure of the water used during the spray process, or columnar stream processing described above is preferably ^{10N / cm 2 ~1000N / cm 2} , more preferably ^{50N / cm 2 ~800N / cm 2} , 50N / cm 2 ~500N / cm ² is most preferred. If the water pressure used during physical processing is less than 10 N / cm ^2, the effect of widening the yarn bundle and the weaving intersection of the glass cloth cannot be obtained. If it is greater than 1000 N / cm ^{2, the} glass cloth is constituted by the widening force. There is a risk that the texture of the warp and weft threads will shift. The processing by ultrasonic waves is performed by applying ultrasonic waves to the glass cloth through a medium made of either liquid or gas by an ultrasonic vibrator that vibrates at a specific frequency. The medium for transmitting ultrasonic waves is appropriately selected within a range in which the effect of physical processing is achieved, but is preferably a liquid in order to obtain the effect of processing. Examples of the liquid include water, an organic solvent such as alcohol, and water in which an organic solvent is dispersed.

The frequency of the ultrasonic vibrator in the present invention is preferably 10 to 100 kHz, more preferably 15 to 70 kHz, and most preferably 20 to 50 kHz. When the frequency is less than 10 kHz, the uniformity of the widened state is poor, and when it is higher than 100 kHz, the widened state is low.
The output of the ultrasonic oscillator for driving the ultrasonic transducer is appropriately selected depending on the glass cloth subjected to physical processing, but is most preferably 20 to 5000 W, preferably 100 to 1500 W, and more preferably 200 to 1000 W. An example of such an apparatus is a Phoenix series ultrasonic oscillator manufactured by Kaijo Corporation.
In a preferred embodiment of the present invention, the glass cloth and the ultrasonic vibrator are both immersed in a liquid bath, and the ultrasonic wave is generated from the ultrasonic vibrator by an ultrasonic oscillator to physically remove the glass cloth. Process. During physical processing, the glass cloth and the ultrasonic vibrator are arranged so as not to contact each other.

  That is, transmission of ultrasonic waves to the glass cloth in the present invention is not performed by direct contact between the glass cloth and the ultrasonic vibrator, but is performed through a medium. The distance between the glass cloth and the ultrasonic vibrator is preferably in the range of 1 to 30 cm, more preferably in the range of 1 to 10 cm. When the distance between the glass cloth and the ultrasonic vibrator is less than 1 cm, the processing state of the glass cloth may be locally deformed, resulting in poor appearance. Further, when the distance is larger than 30 cm, the loss until the energy of the ultrasonic transducer is transmitted to the glass cloth increases. The distance between the glass cloth and the ultrasonic vibrator is preferably determined in consideration of conditions such as the type of glass cloth, the type of liquid, the frequency of the ultrasonic vibrator, the output of the ultrasonic oscillator, and the transmission direction of the ultrasonic wave. . Further, since it is only necessary to install the ultrasonic vibrator so that the distance between the vibration surface and the glass cloth is substantially constant, the number of the ultrasonic vibrators may be one or plural.

Moreover, the processing method of the above-mentioned glass cloth can be performed by either a continuous type or a batch type. When processing continuously, for example, a method is adopted in which an ultrasonic vibrator is fixed in a tank containing a liquid and a glass cloth is run so as to pass through the tank. The traveling speed of the glass cloth is appropriately set within a range in which the processing effect of the present invention is achieved, but is preferably 0.1 to 100 m / min.
The arrangement of the ultrasonic vibrator and the glass cloth is usually set so that the width direction of the vibrator is perpendicular to the traveling direction of the glass cloth, but may be set to form an angle of several tens of degrees. . The immersion time of the glass cloth in the liquid is appropriately set under the condition that the effect of the present invention is achieved, but is preferably about 0.01 to 30 seconds.
The glass cloth subjected to the above-described physical processing is dried by an infrared heater, a hot air dryer or the like. The drying conditions are preferably 100 to 200 ° C. and about 10 seconds to 2 minutes. When the tension applied to the warp yarn, or warp yarn and weft yarn during drying is high, the warp yarn which has been sufficiently widened by physical processing, or the warp yarn and weft yarn may return due to the tension. Also, it is preferable to perform the warp yarn in the same range as the physical processing, or under the warp yarn and weft yarn tension conditions.

When the glass cloth physically processed and dried by the method of the present invention is wound on a roll, the tension applied to the warp yarn in the warp yarn direction is 1.5 × 10 ^{−4 to} 6 × 10. ^-3 N is preferable, 6 × 10 ^{−4 to} 4.5 × 10 ⁻³ N is more preferable, and 1.5 × 10 ^{−3 to} 3 × 10 ⁻³ N is preferable. It is most preferable to be within the range. In the case of winding with a tension of less than 1.5 × 10 ⁻⁴ N, it is difficult to prevent the occurrence of collapse. Further, when winding with a tension larger than 6 × 10 ⁻³ N, the warp yarn sufficiently widened by the processing method of the present invention may be returned by the tension, which is not preferable.
The glass cloth wound around the roll is made into a product by removing the lubricant such as a sizing agent applied to the surface by high temperature de-glue and applying a silane coupling agent.

Hereinafter, the present invention will be described in detail with reference to examples.
The physical properties and test methods of the glass cloths in Examples and Comparative Examples were measured by the following methods.
1. Measurement method of physical properties of glass cloth: Measured according to JIS R3420.
2. Method for measuring the amount of bending of glass cloth: In a glass cloth having a length of 100 m, the amount of bending of ten places every 10 m (when a ruler is arranged in parallel to the width direction of the cloth and the yarns are arranged at equal intervals. The maximum amount of deviation between the yarn position and the actual yarn position) was measured, and the average amount of bending was determined.
In Examples 1 to 4 and Comparative Examples 1 to 3 other than Example 5, physical processing was performed without applying tension in the weft direction.

(Example 1)
As a glass cloth, an E glass composition glass yarn having an average filament diameter of 5.0 μm, a filament count of 100, and a twist number of 1.0 Z is used for warp and weft yarns. In an air jet loom, the warp yarn density is 70 / Inch, weft glass cloth with a weft density of 70 / inch and weaving density of 1N in the warp direction on the resulting green machine (cross width 1280mm) (tension applied per warp thread) Is 2.8 × 10 ⁻⁴ N. The tension applied to one yarn is obtained by dividing the tension applied in the warp direction of the raw machine by the product of the warp yarn density (lines / inch) and the cross width (mm). can be determined by applying a 25.4 to one. in), the physical process by the high-pressure water spray stream (processing pressure 300N / cm ^2), at 170 ° C. under conditions giving tension of 1N in warp direction 0 seconds and dried. Thereafter, the film was wound on a roll under the condition that the tension applied per one warp yarn was 2 × 10 ⁻³ N, and was subjected to high temperature desizing at 400 ° C. for 24 hours.
Subsequently, the glass cloth was dipped in an aqueous solution of SZ6032 (manufactured by Dow Corning Toray Co., Ltd.), which is a silane coupling agent, as a surface treatment, and after drying, dried at 170 ° C. for 1 minute. As a result, the weight is 30 g / m ² , the thickness is 0.028 mm, the ratio of the warp width to the weft thread width (warp / width) is 0.95, the warp thread direction thread-thread interval is 0.056 mm, and the weft direction. A glass cloth having a yarn-thread interval of 0.040 mm, an air permeability of 38 cm ³ / cm ² / sec, and a bend amount of 4 mm was obtained.

(Example 2)
As a glass cloth, an E glass composition glass yarn having an average filament diameter of 5.0 μm, a filament count of 100, and a twist number of 1.0 Z is used for warp and weft yarns. In an air jet loom, the warp yarn density is 70 / Inch, weft glass cloth with a weft density of 70 / inch and weaving density of 1N in the warp direction on the resulting green machine (cross width 1280mm) (tension applied per warp thread) 2.8 × 10 ⁻⁴ N) was used for physical processing by ultrasonic waves (frequency 38 kHz, output 600 W), and dried at 170 ° C. for 30 seconds under a condition in which a tension of 1 N was applied in the warp yarn direction. Thereafter, the film was wound on a roll under the condition that the tension applied per one warp yarn was 2 × 10 ⁻³ N, and was subjected to high temperature desizing at 400 ° C. for 24 hours.
Subsequently, the glass cloth was dipped in an aqueous solution of SZ6032 (manufactured by Dow Corning Toray Co., Ltd.), which is a silane coupling agent, as a surface treatment, and after drying, dried at 170 ° C. for 1 minute. As a result, the weight is 30 g / m ² , the thickness is 0.027 mm, the ratio of the warp width to the weft thread width (warp / width) is 0.97, the warp thread direction thread-to-thread distance is 0.049 m, the weft direction. A glass cloth having a thread-thread interval of 0.039 mm, an air permeability of 32 cm ³ / cm ² / sec, and a bending amount of 3 mm was obtained.

(Example 3)
As the glass cloth, an E glass composition glass yarn having an average filament diameter of 5.0 μm, a filament count of 200, and a twist number of 1.0 Z is used for the warp and weft yarns. Inch, weft glass cloth with a weft density of 60 / inch and weaving a glass cloth with a tension of 1N in the warp direction on the resulting green machine (cross width 1280 mm) (tension applied per warp thread) 3.3 × 10 ⁻⁴ N) was subjected to physical processing using a high-pressure water spray (processing pressure 300 N / cm ² ) and dried at 170 ° C. for 30 seconds under a condition in which a tension of 1 N was applied in the warp yarn direction. Thereafter, the film was wound on a roll under the condition that the tension applied per one warp yarn was 2 × 10 ⁻³ N, and was subjected to high temperature desizing at 400 ° C. for 24 hours.
Subsequently, the glass cloth was immersed in an aqueous solution of SZ6032 (manufactured by Toray Dow Corning Co., Ltd.), which is a silane coupling agent, as the surface treatment, and after squeezing, it was dried at 170 ° C. for 1 minute. As a result, the weight is 53 g / m ² , the thickness is 0.048 mm, the ratio of the warp width to the weft thread width (warp / width) is 0.95, the warp thread direction thread-to-thread distance is 0.058 mm, and the weft direction. A glass cloth having a thread-thread interval of 0.039 mm, an air permeability of 11 cm ³ / cm ² / sec, and a bending amount of 3 mm was obtained.

Example 4
As the glass cloth, an E glass composition glass yarn having an average filament diameter of 5.0 μm, a filament count of 200, and a twist number of 1.0 Z is used for the warp and weft yarns. Inch, weaving glass cloth with a weft density of 60 yarns / inch, and applying a tension of 1N in the warp direction to the resulting raw machine (cross width 1280 mm) (tension applied per warp yarn) 3.3 × 10 ⁻⁴ N) was subjected to physical processing by ultrasonic waves (vibration frequency 38 kHz, output 600 W), and dried at 170 ° C. for 30 seconds under a condition in which a tension of 1 N was applied in the warp yarn direction. Thereafter, the film was wound on a roll under the condition that the tension applied per one warp yarn was 2 × 10 ⁻³ N, and was subjected to high temperature desizing at 400 ° C. for 24 hours.
Subsequently, the glass cloth was immersed in an aqueous solution of SZ6032 (manufactured by Toray Dow Corning Co., Ltd.), which is a silane coupling agent, as the surface treatment, and after squeezing, it was dried at 170 ° C. for 1 minute. As a result, the weight is 53 g / m ² , the thickness is 0.046 mm, the ratio of the warp width to the weft thread width (warp / width) is 0.97, the warp thread direction thread-thread interval is 0.046 mm, and the weft direction. A glass cloth having a thread-thread interval of 0.035 mm, an air permeability of 9 cm ³ / cm ² / sec, and a bending amount of 2 mm was obtained.

(Example 5)
As the glass cloth, an E glass composition glass yarn having an average filament diameter of 5.0 μm, a filament count of 200, and a twist number of 1.0 Z is used for the warp and weft yarns. Inch, weaving glass cloth with a weft density of 60 yarns / inch, and 1N tension in the warp yarn direction on the resulting raw machine (cross width 1280 mm) (the tension applied per warp yarn is 3.3 × 10 ^-4 N), physical processing (processing pressure 300 N / cm ² ) by high-pressure water sprinkling is performed under the condition that a tension of 3.3 × 10 ^-4 N is applied to one weft by a tenter in the weft direction. The film was dried at 170 ° C. for 30 seconds under a condition in which a tension of 1N was applied in the warp direction and a tension of 3.3 × 10 ⁻⁴ N was applied to one weft by a tenter in the weft direction. Thereafter, the film was wound on a roll under the condition that the tension applied per one warp yarn was 2 × 10 ⁻³ N, and was subjected to high temperature desizing at 400 ° C. for 24 hours.
Subsequently, the glass cloth was immersed in an aqueous solution of SZ6032 (manufactured by Toray Dow Corning Co., Ltd.), which is a silane coupling agent, as the surface treatment, and after squeezing, it was dried at 170 ° C. for 1 minute. As a result, the weight is 53 g / m ² , the thickness is 0.048 mm, the ratio of the warp width to the weft thread width (warp / width) is 0.93, the warp direction thread-to-thread distance is 0.068 mm, the width direction A glass cloth having a yarn-thread interval of 0.042 mm, an air permeability of 10 cm ³ / cm ² / sec, and a bending amount of 2 mm was obtained.

(Comparative Example 1)
As a glass cloth, an E glass composition glass yarn having an average filament diameter of 5.0 μm, a filament count of 100, and a twist number of 1.0 Z is used for warp and weft yarns. In an air jet loom, the warp yarn density is 70 / Inch, weft glass cloth with a weft density of 70 / inch, and under the condition that tension is not applied in the warp direction to the resulting raw machine (cross width 1280mm) (0N tension per warp thread) Was subjected to physical processing (processing pressure 300 N / cm ² ) using a high-pressure water spray, and dried at 170 ° C. for 30 seconds under a condition in which no tension was applied in the warp yarn direction. Thereafter, the film was wound on a roll under the condition that the tension applied per one warp yarn was 2 × 10 ⁻³ N, and was subjected to high temperature desizing at 400 ° C. for 24 hours.
Subsequently, the glass cloth was dipped in an aqueous solution of SZ6032 (manufactured by Dow Corning Toray Co., Ltd.) that is a silane coupling agent as a surface treatment, and after squeezing, it was dried at 170 ° C. for 1 minute. As a result, the weight is 30 g / m ² , the thickness is 0.031 mm, the ratio of the warp width to the weft thread width (warp / width) is 0.89, the warp thread direction thread-thread interval is 0.077 mm, and the weft direction. A glass cloth having a yarn-thread interval of 0.042 mm and an air permeability of 80 cm ³ / cm ² / sec was obtained, but the amount of bending was as large as 35 mm.

(Comparative Example 2)
As a glass cloth, an E glass composition glass yarn having an average filament diameter of 5.0 μm, a filament count of 100, and a twist number of 1.0 Z is used for warp and weft yarns. In an air jet loom, the warp yarn density is 70 / Inch, weaving a glass cloth with a weft density of 70 pieces / inch, and applying a tension of 100 N in the warp direction to the resulting raw machine (cross width 1280 mm) (tension applied per warp thread) 0.028 N) was processed with a high-pressure water spray (processing pressure 300 N / cm ² ), and was dried at 170 ° C. for 30 seconds under a condition in which a tension of 100 N was applied in the warp yarn direction. Thereafter, the film was wound on a roll under the condition that the tension applied per one warp yarn was 2 × 10 ⁻³ N, and was subjected to high temperature desizing at 400 ° C. for 24 hours.
Subsequently, the glass cloth was dipped in an aqueous solution of SZ6032 (manufactured by Dow Corning Toray Co., Ltd.) that is a silane coupling agent as a surface treatment, and after squeezing, it was dried at 170 ° C. for 1 minute. As a result, the weight is 30 g / m ² , the thickness is 0.033 mm, the ratio of the warp width to the weft thread width (warp / width) is 0.52, the warp direction thread-thread interval is 0.176 mm, and the direction is horizontal. A glass cloth having a yarn-thread interval of 0.004 mm, an air permeability of 50 cm ³ / cm ² / sec, and a bending amount of 12 mm was obtained. As can be seen from the fact that the warp / width is as small as 0.52, the opening of the warp was insufficient for the weft.

(Comparative Example 3)
As the glass cloth, an E glass composition glass yarn having an average filament diameter of 5.0 μm, a filament count of 200, and a twist number of 1.0 Z is used for the warp and weft yarns. Inch, weft glass cloth with a weft density of 60 / inch and weaving density of 100N in the warp direction to the resulting green machine (cross width 1280mm) (tension applied per warp thread) 0.033N) was processed with a high-pressure water spray (processing pressure 300 N / cm ² ), and dried at 170 ° C. for 30 seconds under a condition in which a tension of 100 N was applied in the warp yarn direction. Thereafter, the film was wound on a roll under the condition that the tension applied per one warp yarn was 2 × 10 ⁻³ N, and was subjected to high temperature desizing at 400 ° C. for 24 hours.
Subsequently, the glass cloth was dipped in an aqueous solution of SZ6032 (manufactured by Dow Corning Toray Co., Ltd.) that is a silane coupling agent as a surface treatment, and after squeezing, it was dried at 170 ° C. for 1 minute. As a result, the weight is 53 g / m ² , the thickness is 0.053 mm, the ratio of the warp width to the weft thread width (warp / width) is 0.57, the warp direction thread-to-thread distance is 0.185 mm, and the direction is horizontal. A glass cloth having a yarn-thread interval of 0.005 mm, an air permeability of 23 cm ³ / cm ² / sec, and a bending amount of 10 mm was obtained. As can be seen from the fact that the warp / width is as small as 0.57, the opening of the warp was insufficient with respect to the weft.

  The processing method of this invention can be utilized suitably in the field | area of manufacture of the glass cloth used for a printed wiring board.

Claims (4)

Method for processing a glass cloth, a woven glass cloth, the range of tension on the warp yarn per one constituting the glass cloth is ^{1.5 × 10 -4 ~6 × 10 -3} N, water Characterized in that at least one physical processing selected from the group consisting of processing by pressure, processing by high-frequency vibration using a liquid medium, processing by pressurizing with a roll, and processing by ultrasonic waves is applied and dried. How to process glass cloth. ^2. The method for processing a glass cloth according to claim 1, wherein the physical processing is physical processing by a water flow having a pressure in a range of 10 N / cm < ² > to 1000 N / cm < ² >.   2. The method of processing a glass cloth according to claim 1, wherein the physical processing is physical processing using ultrasonic waves generated by an ultrasonic vibrator that vibrates at a frequency in a range of 10 kHz to 100 kHz. The woven glass cloth is subjected to physical processing and dried in a range of tension of 1.5 × 10 ^{−4 to} 6 × 10 ⁻³ N per weft yarn constituting the glass cloth. The processing method of the glass cloth of any one of Claims 1-3.