Smoke-proof hanging wall

Abstract

To provide a fiber-reinforced resin sheet that are less prone to whitening.SOLUTION: A resin sheet 10 has a fiber-reinforced resin layer 11, in which a glass cloth 12 is impregnated with resin. A weave density of a warp 12a and a weft 12b yarns constituting the glass cloth 12 is 55 threads / 25 mm or less, and a diameter R of the warp 12a and the weft 12b is 80 μm or less. The diameter R=2×(100000000 / (100×π×L×d))0.5 (where L and d represent "length per unit weight (g / m)" and "specific gravity (g / cm3)" determined by a standard of glass fiber used for the warp 12a and the weft 12b, and π represents a circumference).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a fiber-reinforced resin sheet impregnated with resin in a glass cloth, and a smoke-proof curtain wall using the same.

Background Art

[0002] A fiber-reinforced resin sheet impregnated with resin in a glass cloth has incombustibility that is difficult to burn even when exposed to high temperatures such as in a fire. For this reason, the fiber-reinforced resin sheet is used as a smoke-proof curtain wall, a partition sheet, etc. (see, for example, Patent Documents 1 to 3). When the fiber-reinforced resin sheet is used in such applications, transparency is required so as not to obstruct the view or impair the appearance.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the construction of a smoke-proof curtain wall or the like, the fiber-reinforced resin sheet may be bent according to the shape of the mounting frame. Also, during construction, the sharp part of the tool may come into contact with the fiber-reinforced resin sheet.

[0005] However, in the conventional fiber-reinforced resin sheet, when it is bent or comes into contact with a tool, a problem occurs in that whitening occurs and the appearance deteriorates.

[0006] An object of the present disclosure is to provide a fiber-reinforced resin sheet in which whitening hardly occurs.

Means for Solving the Problems

[0007] To achieve the above object, a first aspect according to the present disclosure is a resin sheet having a fiber-reinforced resin layer in which a glass cloth is impregnated with a resin, wherein the weaving density of the warp and weft constituting the glass cloth is 55 threads / 25 mm or less, and the diameters R of the warp and the weft are 80 μm or less. Incidentally, the diameter R = 2 × (100000000 / (100 × π × L × d)) 0.5 (However, L and d are the "length per unit weight ([[]]" and "specific gravity (g / cm m / g )" determined by the standard of the glass fiber used for the warp and the weft, and π represents the pi.) 3 )

[0008] According to the first aspect, the weaving density of the warp and weft (hereinafter sometimes collectively referred to as glass yarns) constituting the glass cloth is low, and the glass yarns are thin. Therefore, the area of the interface between the glass yarns and the resin in the sheet becomes small. Accordingly, it is presumed that the occurrence of whitening is suppressed as the peeling of the interface is suppressed when bent or when in contact with a tool.

[0009] A second aspect according to the present disclosure is, in the first aspect, that the total light transmittance Tt is 85% or more, the haze Hz is 8% or less, and the changes in the total light transmittance Tt and the haze Hz ((value after the test) - (value before the test)) before and after the flexural resistance (cylindrical mandrel method) test conforming to JIS K 5600-5-1:1999 are defined as ΔTt and ΔHz, respectively, then ΔTt is -0.5% or more and 0% or less, and ΔHz is 0% or more and 1.0% or less.

[0010] According to the second aspect, it is possible to provide a fiber-reinforced resin sheet having high transparency and capable of sufficiently suppressing whitening.

[0011] A third aspect according to the present disclosure is, in the first or second aspect, that the ratio of the total surface area of the warp and the weft to the volume of the fiber-reinforced resin layer is 8 mm -1 or more.

[0012] According to the third aspect, a fiber-reinforced resin sheet having good nonflammability can be provided.

[0013] According to a fourth aspect of the present disclosure, in the third aspect, the ratio is 9.5 mm -1 or more and 14.5 mm -1 or less.

[0014] According to the fourth aspect, a fiber-reinforced resin sheet excellent in appearance and having good visibility can be provided.

[0015] According to a fifth aspect of the present disclosure, in any one of the first to fourth aspects, the resin sheet further includes another resin layer laminated on one or both surfaces of the fiber-reinforced resin layer.

[0016] According to the fifth aspect, rigidity (stiffness) can be imparted to the resin sheet, so that workability can be improved.

[0017] According to a sixth aspect of the present disclosure, a smoke-proof curtain using the resin sheet according to any one of the first to fifth aspects, the resin sheet includes a frame for holding the resin sheet.

[0018] According to the sixth aspect, since a fiber-reinforced resin sheet in which whitening hardly occurs is used, a smoke-proof curtain excellent in appearance can be provided.

Advantages of the Invention

[0019] According to the present disclosure, a fiber-reinforced resin sheet in which whitening hardly occurs can be provided.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0021] (Embodiment) Hereinafter, the resin sheet and the smoke-proof curtain according to an embodiment of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications can be made without departing from the technical idea of the present disclosure.

[0022] <Configuration of Resin Sheet> The resin sheet 10 of the present embodiment has, for example, as shown in FIG. 1, a fiber-reinforced resin layer 11 in which a resin is impregnated into a glass cloth 12. The thickness of the fiber-reinforced resin layer 11 is, for example, about 50 μm to 150 μm, and the thickness of the glass cloth 12 is, for example, about 25 μm to 60 μm. The mass per unit area of the glass cloth 12 is, for example, 20 g / m 2 ~100 g / m 2 and more preferably about 35 g / m 2 ~50 g / m 2 The type of resin to be impregnated into the glass cloth 12 is not particularly limited, and for example, thermosetting resins such as vinyl ester and unsaturated polyester, or photocurable resins such as epoxy, acrylic, and urethane may be used.

[0023] The fiber-reinforced resin layer 11 can be manufactured using a known manufacturing method. For example, while continuously running a glass cloth, a first carrier film coated with an uncured resin is continuously run and pressed against one surface of the glass cloth. At the same time, a second carrier film is continuously run and pressed against the other surface of the glass cloth. Thereby, the glass cloth and the uncured resin are sandwiched between the first and second carrier films to impregnate the resin. Then, the fiber-reinforced resin layer 11 can be manufactured by a continuous molding method by curing the resin and molding it into a fiber-reinforced resin sheet.

[0024] In the present embodiment, resin layers 13 are formed on both surfaces of the fiber-reinforced resin layer 11 by the resin impregnated in the glass cloth 12, but the resin layers 13 may not be formed.

[0025] Also, in the present embodiment, in order to impart rigidity (stiffness) to the resin sheet 10 and improve workability, other resin layers 14 are formed on both surfaces of the fiber-reinforced resin layer 11, but the other resin layers 14 may be formed on only one side of the fiber-reinforced resin layer 11, or may not be formed on both sides. The other resin layer 14 may be composed of, for example, a base material layer having a thickness of about 10 μm to 20 μm made of polyethylene terephthalate, polyethylene, polypropylene, polycarbonate, etc., and an adhesive layer having a thickness of about 10 μm to 20 μm made of, for example, acrylic.

[0026] As shown in FIG. 2, the glass cloth 12 is configured by combining a plurality of warp threads 12a and a plurality of weft threads 12b. That is, the glass cloth 12 is woven using glass fibers for the warp threads 12a and the weft threads 12b. The weave of the glass cloth 12 may be, for example, plain weave, twill weave, satin weave, twill weave, or rib weave. In the glass cloth 12, the gaps between adjacent warp threads 12a and the gaps between adjacent weft threads 12b are, for example, 0.5 mm or less. The glass fibers used for the glass cloth 12 are not particularly limited, and may be, for example, general-purpose non-alkali glass fibers (E glass), acid-resistant alkali-containing glass fibers (C glass), alkali-resistant glass fibers (AR glass), etc.

[0027] As shown in FIG. 3, the warp 12a and the weft 12b of the glass cloth 12 (hereinafter sometimes collectively referred to as glass yarns 12a and 12b) are formed by converging a plurality of filaments 15. The diameter of the filament 15 is, for example, about 1 μm to 20 μm, more preferably about 3 μm to 7 μm.

[0028] The glass cloth 12 may be woven with one type of glass fiber or may be woven with two or more types of glass fibers. For example, different glass fibers may be used for the warp 12a and the weft 12b. When two or more types of glass fibers are used, the filament diameter and the count of each glass fiber may be the same or different. For example, the composition of each glass fiber may be the same, and the filament diameter and the count may be changed.

[0029] In the present embodiment, the weaving density of the glass yarns 12a and 12b is 55 threads / 25 mm or less. The lower limit of the weaving density of the glass yarns 12a and 12b is, for example, 25 threads / 25 mm. The diameter of the glass yarns 12a and 12b is 80 μm or less, more preferably 75 μm or less. The lower limit of the diameter of the glass yarns 12a and 12b is, for example, 30 μm.

[0030] In the present disclosure, the "diameter R (μm) of the glass yarn" means that a glass yarn formed by converging a large number of filaments is regarded as a single fiber having a circular cross-section for convenience, and the length per unit weight of the glass yarn is L ( km / kg (that is m / g ), the specific gravity of the glass yarn is d (g / cm 3 ), and using π as the pi, R = 2×(100000000 / (100×π×L×d)) 0.5 represents the value calculated by. Incidentally, L and d are determined according to the standard of the glass fiber. For example, the specific gravity d of E glass is 2.55 (g / cm 3 ). Also, the reciprocal 1 / L of L ( g / m ) represents the weight per unit length of the glass yarn.

[0031] The calculation formula for the diameter R is derived as follows. Assuming that the cross-sectional shape of a glass fiber (a single fiber) is a circle with a diameter R (radius r), the weight A (g) of 1 cm of the glass fiber can be expressed using L as A [g] = 1 [cm] × 1 / 100L [g / cm], and using d as A [g] = r [cm] × r [cm] × π × 1 [cm] × d [g / cm 3 . Thus, 1 / 100L = r 2 × π × d holds, so r 2 = 1 / (100 × π × L × d) [cm 2 = 100000000 / (100 × π × L × d) [μm 2 is derived. Therefore, since the radius r = (100000000 / (100 × π × L × d)) 0.5 [μm], the diameter R = 2 × (100000000 / (100 × π × L × d)) 0.5 [μm] is derived.

[0032] Also, in this embodiment, the ratio of the mass of the glass cloth 12 to the mass of the fiber-reinforced resin layer 11 (the total mass of the glass cloth 12 and the resin impregnating it) is 55% or less, preferably 46% or less. When this ratio exceeds 55%, that is, when the proportion of the glass cloth 12 is large, the glass fibers are likely to be visible and the appearance is likely to deteriorate. From the viewpoint of non-combustibility, this ratio is preferably 28% or more, and from the viewpoint of visibility, it is preferably 33% or more. This is because when the proportion of the glass cloth 12 is small, that is, when the proportion of the impregnating resin is large, the haze (visibility) is likely to deteriorate.

[0033] Also, in this embodiment, the ratio of the surface area of the glass fibers 12a and 12b (the total surface area of the warp 12a and the weft 12b) (mm 3 ) to the volume of the fiber-reinforced resin layer 11 (mm 2 ) is 20 mm -1 or less, and preferably 14.5 mm -1 or less from the viewpoint of appearance. This ratio is 7 mm -1 or more, preferably 8 mm -1 or more from the viewpoint of non-combustibility, and 9.5 mm -1It is preferably as described above. An example of the calculation method of the ratio is as follows. (1) Calculate the surface area S (mm 2 ) of the glass yarn by S = ((warp weaving density [threads / 25 mm] × warp diameter [mm]) + (weft weaving density [threads / 25 mm] × weft diameter [mm])) × π × 25 [mm]. That is, in accordance with the unit of the weaving density, calculate the surface area per unit area (25 mm square). Here, the areas of both end faces of the warp and weft are assumed to be sufficiently small and not included in the calculation. (2) Calculate the volume V (mm 3 ) of the fiber-reinforced resin layer by V = thickness [mm] × 25 [mm] × 25 [mm]. (3) Calculate the ratio S / V (mm -1 ) of the surface area S of the glass yarn to the volume V of the fiber-reinforced resin layer.

[0034] Also, in this embodiment, the total light transmittance Tt of the resin sheet 10 is 85% or more, preferably 88% or more, and more preferably 90% or more. The haze Hz of the resin sheet 10 is 8% or less, preferably 7% or less, and more preferably 5% or less. By setting the total light transmittance Tt and the haze Hz within the above ranges, the visibility of the resin sheet 10 is improved, and it is possible to make the resin sheet 10 inconspicuous when constructing a smoke-proof curtain wall or the like using the resin sheet 10. Incidentally, when the change amounts ((value after the test) - (value before the test)) of the total light transmittance Tt and the haze Hz before and after the flexural resistance (cylindrical mandrel method) test conforming to JIS K 5600-5-1:1999 are defined as ΔTt and ΔHz, it is preferable that ΔTt is -0.5% or more and 0% or less, and ΔHz is 0% or more and 1.0% or less.

[0035] <Effects of the Embodiment> According to the resin sheet 10 of the present embodiment described above, it has a fiber-reinforced resin layer 11 impregnated with resin in a glass cloth 12, and the weaving density of the glass yarns (warp 12a and weft 12b) constituting the glass cloth 12 is 55 threads / 25 mm or less, and the diameters R of the glass yarns 12a and 12b are 80 μm or less. Thus, since the weaving density of the glass yarns 12a and 12b is low and the glass yarns 12a and 12b are thin, the area of the interface between the glass yarns 12a and 12b and the resin in the resin sheet 10 becomes small. Therefore, it is presumed that the generation of whitening can be suppressed as a result of suppressing the peeling of the interface when folding or contacting with a tool.

[0036] In the resin sheet 10 of the present embodiment, the total light transmittance Tt is 85% or more, the haze Hz is 8% or less, and taking the respective change amounts of the total light transmittance Tt and the haze Hz before and after the flexural resistance (cylindrical mandrel method) test conforming to JIS K 5600-5-1:1999 as ΔTt and ΔHz, ΔTt may be -0.5% or more and 0% or less, and ΔHz may be 0% or more and 1.0% or less. By doing so, a resin sheet 10 having high transparency and capable of sufficiently suppressing whitening can be provided.

[0037] In the resin sheet 10 of the present embodiment, when the ratio of the surface area of the glass yarns (the total of the surface areas of the warp 12a and the weft 12b) to the volume of the fiber-reinforced resin layer 11 is 8 mm -1 or more, a resin sheet 10 having good non-combustibility can be provided. In this case, when the ratio is 9.5 mm -1 or more and 14.5 mm -1 or less, a resin sheet 10 having excellent appearance and good visibility can be provided.

[0038] In the resin sheet 10 of the present embodiment, when further provided with another resin layer 14 laminated on one or both sides of the fiber-reinforced resin layer 11, rigidity (stiffness) can be imparted to the resin sheet 10, so that the workability can be improved.

[0039] In the resin sheet 10 of the present embodiment, when vinyl ester is used as the resin to be impregnated into the glass cloth 12, a resin sheet 10 less likely to turn white can be provided.

[0040] In the resin sheet 10 of the present embodiment, when the stiffness measured in accordance with JIS L 1906 (General test method for non-woven fabrics) is 1.5 mN or more, a resin sheet 10 less likely to turn white, having good rigidity and good workability can be provided.

[0041] <Example> Hereinafter, the results of performance evaluations such as a non-combustibility test and a flexural resistance (bending whitening property) test on the resin sheet 10 of the example will be described.

[0042] Table 1 shows the configurations of the glass cloth and the fiber reinforced resin layer of each resin sheet of the examples (1 to 7) and comparative examples (1 to 7) for which performance evaluations were conducted.

[0043]

Table 1

[0044] As shown in Table 1, in Examples 1 to 7, as the glass yarns, the same glass cloth was formed using the product symbol ECD 450 1 / 0 manufactured by Nitto Boseki Co., Ltd. for both the warp and weft yarns. The diameter of the filaments constituting the glass yarns was 5 μm for both the warp and weft yarns, the diameter of the glass yarns was 74.8 μm for both the warp and weft yarns, the weight per unit length of the glass yarns was 11.2 tex for both the warp and weft yarns, and the weaving density of the glass yarns was 53.0 yarns / 25 mm for both the warp and weft yarns. Note that the diameter R of the glass yarns was set to the standard value of 89.2 m / g of ECD 450 1 / 0 for both the warp and weft yarns for “the length L per unit weight ( m / g )”, and the specific gravity d (g / cm 3 ) of E glass was used for both the warp and weft yarns as 2.55 (g / cm 3 ), and the following calculation formula R = 2×(100000000 / (100×π×L×d)) 0.5 It was calculated using

[0045] Also, as shown in Table 1, in Examples 1 to 7, the thickness of the glass cloth was 45 μm, and the mass of the glass cloth per unit area was 47.5 g / m 2 and the surface area of the glass fibers in a 25 mm square of the glass cloth was 311.4 m for both the warp and weft threads 2 and, when added together, it was 622.7 m 2

[0046] In Examples 1 to 7, the glass cloth shown in Table 1 was impregnated with a vinyl ester resin to form a fiber-reinforced resin layer. The ratio (weight ratio) of glass fibers in the fiber-reinforced resin layer was 23% in Example 1, 32% in Example 2, 34% in Example 3, 38% in Example 4, 43% in Example 5, 50% in Example 6, and 38% in Example 7. The thickness of the fiber-reinforced resin layer (including the resin layer formed on the glass cloth surface) was 140 μm in Example 1, 110 μm in Example 2, 97 μm in Example 3, 85 μm in Example 4, 73 μm in Example 5, 60 μm in Example 6, and 85 μm in Example 7. The "surface area of glass fibers (glass fibers) / volume of fiber-reinforced resin layer (including the resin layer formed on the glass cloth surface)" at each thickness of the fiber-reinforced resin layer was 7.12 mm -1 in Example 1, 9.06 mm in Example 2 -1 10.27 mm in Example 3 -1 11.72 mm in Example 4 -1 13.65 mm in Example 5 -1 16.61 mm in Example 6 -1 11.72 mm in Example 7 -1

[0047] ​​In Examples 1 to 7, vinyl ester resin SSP50C-06P manufactured by Showa Denko KK was used as the resin to be impregnated into the glass cloth. Specifically, for 100 parts by weight of the vinyl ester resin SSP50C-06P, 0.5 part by weight of Perkadox P16 manufactured by Kayaku Akzo Co., Ltd. and 0.5 part by weight of Perocta O-70 manufactured by NOF Corporation were each mixed as curing agents, and after stirring for about 20 minutes using a stirrer, the resulting mixture was left standing in an oven at 30 degrees for about 30 minutes to degas, and the resulting uncured resin composition was impregnated into the glass cloth.

[0048] In Example 7, on both sides of the fiber-reinforced resin layer obtained by impregnating the glass cloth with the resin as described above, a resin base material layer made of polyethylene terephthalate with a thickness of 16 μm was formed via a resin adhesive layer made of acrylic with a thickness of 15 μm.

[0049] On the other hand, in Comparative Examples 1 to 5, the same glass cloth was constructed using, as the glass yarns, product symbol ECE 225 1 / 0 1.0Z manufactured by Nitto Boseki Co., Ltd. for the warp and product symbol ECD 450 1 / 0 0.8Z manufactured by Nitto Boseki Co., Ltd. for the weft. The diameter of the filaments constituting the glass yarns was 7 μm for the warp and 5 μm for the weft, the diameter of the glass yarns was 105.8 μm for the warp and 74.8 μm for the weft, the weight per unit length of the glass yarns was 22.5 tex for the warp and 11.2 tex for the weft, and the weave density of the glass yarns was 72.0 threads / 25 mm for the warp and 65.0 threads / 25 mm for the weft. The diameter R of the glass yarns was calculated using the following formula with the standard value of 44.6 m / g for the warp of the specification number of ECE 225 1 / 0 and 89.2 m / g for the weft of the specification number of ECD 450 1 / 0 for "length L per unit weight ( m / g )", and the specific gravity of E-glass of 2.55 (g / cm 3 ) for both the warp and the weft for "specific gravity d (g / cm 3 )". R = 2 × (100000000 / (100 × π × L × d)) 0.5 It was calculated using.

[0050] Also, as shown in Table 1, in Comparative Examples 1 to 5, the thickness of the glass cloth was 82 μm, and the mass of the glass cloth per unit area was 94 g / m 2 and the surface area of the glass yarns in a 25 mm square of the glass cloth was 598.2 m for the warp yarns 2 and 381.9 m for the weft yarns 2 and, when totaled, it was 980.0 m 2 .

[0051] In Comparative Examples 1 to 5, the glass cloths shown in Table 1 were each impregnated with a vinyl ester resin in the same manner as in Examples 1 to 7 to form a fiber-reinforced resin layer. The ratio (weight ratio) of the glass fibers in the fiber-reinforced resin layer was 40% for Comparative Example 1, 43% for Comparative Example 2, 45% for Comparative Example 3, 49% for Comparative Example 4, and 53% for Comparative Example 5. The thickness of the fiber-reinforced resin layer (including the resin layer formed on the glass cloth surface) was 154 μm for Comparative Example 1, 145 μm for Comparative Example 2, 132 μm for Comparative Example 3, 120 μm for Comparative Example 4, and 108 μm for Comparative Example 5. The "surface area of the glass yarns (glass fibers) / volume of the fiber-reinforced resin layer (including the resin layer formed on the glass cloth surface)" at each thickness of the fiber-reinforced resin layer was 9.50 mm for Comparative Example 1 -1 , 10.81 mm for Comparative Example 2 -1 , 11.88 mm for Comparative Example 3 -1 , 13.07 mm for Comparative Example 4 -1 , 14.52 mm for Comparative Example 5 -1 .

[0052] Also, in Comparative Example 6, as the glass yarns, a glass cloth was formed using the product symbol ECE 225 1 / 0 manufactured by Nitto Boseki Co., Ltd. for the warp yarns and the product symbol ECD 450 1 / 0 manufactured by Nitto Boseki Co., Ltd. for the weft yarns. The diameter of the filaments constituting the glass yarns was 7 μm for the warp yarns and 5 μm for the weft yarns, the diameter of the glass yarns was 105.8 μm for the warp yarns and 74.8 μm for the weft yarns, the weight per unit length of the glass yarns was 22.5 tex for the warp yarns and 11.2 tex for the weft yarns, and the weaving density of the glass yarns was 59.0 threads / 25 mm for the warp yarns and 57.0 threads / 25 mm for the weft yarns. Incidentally, the diameter R of the glass yarns is "the length L per unit weight ( m / g)」The warp has a standard value of 44.6 m / g according to ECE 225 1 / 0, and the weft has a standard value of 89.2 m / g according to ECD 450 1 / 0. For "specific gravity d (g / cm 3 )", the specific gravity of E-glass for both the warp and the weft is 2.55 (g / cm 3 ). Using the following calculation formula R = 2×(100000000 / (100×π×L×d)) 0.5 it was calculated.

[0053] Also, as shown in Table 1, in Comparative Example 6, the thickness of the glass cloth was 90 μm, the mass of the glass cloth per unit area was 104 g / m 2 , and the surface area of the glass fibers in a 25 mm square of the glass cloth was 490.2 m for the warp 2 and 334.9 m for the weft 2 . In total, it was 825.0 m 2 .

[0054] In Comparative Example 6, the glass cloth shown in Table 1 was impregnated with a vinyl ester resin in the same manner as in Examples 1 to 7 to form a fiber-reinforced resin layer. The ratio (weight ratio) of the glass fibers in the fiber-reinforced resin layer was 49%. The thickness of the fiber-reinforced resin layer (including the resin layer formed on the glass cloth surface) was 120 μm. The "surface area of the glass yarns (glass fibers) / volume of the fiber-reinforced resin layer (including the resin layer formed on the glass cloth surface)" at each thickness of the fiber-reinforced resin layer was 11.00 mm -1 .

[0055] Also, in Comparative Example 7, as the glass yarns, a glass cloth was constructed using the product symbol ECDE 300 1 / 0 manufactured by Nitto Boseki Co., Ltd. for both the warp and the weft. The diameter of the filaments constituting the glass yarns was 6 μm for both the warp and the weft, the diameter of the glass yarns was 91.9 μm for both the warp and the weft, the weight per unit length of the glass yarns was 16.9 tex for both the warp and the weft, and the weaving density of the glass yarns was 60.5 threads / 25 mm for the warp and 61.5 threads / 25 mm for the weft. Incidentally, the diameter R of the glass yarns is "the length L per unit weight ( m / g)」 was set as the standard value of 59.2 m / g of ECDE 300 1 / 0 for both the warp and weft threads, and the "specific gravity d (g / cm 3 )」 was set as the specific gravity of E-glass of 2.55 (g / cm 3 ) for both the warp and weft threads, and calculated using the following formula R = 2×(100000000 / (100×π×L×d)) 0.5 as used.

[0056] Also, as shown in Table 1, in Comparative Example 7, the thickness of the glass cloth was 73 μm, and the mass of the glass cloth per unit area was 82 g / m 2 , and the surface area of the glass yarns in a 25 mm square of the glass cloth was 436.3 m for the warp 2 and 443.5 m for the weft 2 , and when added together, it was 879.8 m 2 .

[0057] In Comparative Example 7, the glass cloth shown in Table 1 was impregnated with a vinyl ester resin in the same manner as in Examples 1 to 7 to form a fiber-reinforced resin layer. The ratio (weight ratio) of the glass fibers in the fiber-reinforced resin layer was 49%. The thickness of the fiber-reinforced resin layer (including the resin layer formed on the glass cloth surface) was 120 μm. The "surface area of the glass yarns (glass fibers) / volume of the fiber-reinforced resin layer (including the resin layer formed on the glass cloth surface)" at each thickness of the fiber-reinforced resin layer was 11.73 mm -1 .

[0058] Table 2 shows the results of performing a non-combustibility test and a flexural resistance (bending whitening) test on each of the resin sheets of the above-described Examples (1 to 7) and Comparative Examples (1 to 7).

[0059]

Table 2

[0060] The nonflammability test was conducted in accordance with ISO 5660-1:2002 using a cone calorimeter C3 type manufactured by Toyo Seiki Seisakusho Co., Ltd. for the heat release test. As a result, as shown in Table 2, except for Example 1 and Comparative Example 1, it had good nonflammability. That is, for the examples, it was found that when the ratio of the surface area of the glass yarn (the total surface area of the warp and weft) to the volume of the fiber-reinforced resin layer was 8 mm -1 or more, it had good nonflammability.

[0061] The flexural resistance (bending whitening resistance) test was conducted in accordance with JIS K 5600-5-1:1999 using a flexural resistance (cylindrical mandrel method) evaluation apparatus. A resin sheet was pressed against test cylinders with diameters of 60 mm, 50 mm, 40 mm, 30 mm, 25 mm, 20 mm, 10 mm, 6 mm, and 3 mm, respectively, and the presence or absence of whitening was observed. The size of the resin sheet used as the test piece was 20 mm × 100 mm, and the number of test specimens N was 3. As a result of the flexural resistance test, as shown in Table 2, in Examples 1 to 7, whitening did not occur even with the test cylinder having a minimum diameter of 3 mm, while in Comparative Examples 1 to 7, whitening occurred with the test cylinder having a minimum diameter of 3 cm. In addition, in all examples and comparative examples, whitening did not occur with the test cylinders having diameters of 60 mm, 50 mm, 40 mm, 30 mm, 25 mm, 20 mm, 10 mm, and 6 mm.

[0062] Also, the total light transmittance Tt and haze Hz before and after the flexural resistance test were measured in accordance with JIS K 7375 using a haze meter NDH-4000 type manufactured by Nippon Denshoku Industries Co., Ltd., and the respective change amounts ΔTt and ΔHz ((value after the test) - (value before the test)) of Tt and Hz were calculated. As a result, as shown in Table 2, in Examples 1 to 7, ΔTt was suppressed to -0.5% or more and 0% or less, and ΔHz was suppressed to 0% or more and 1.0% or less, respectively, and a resin sheet having high transparency and capable of sufficiently suppressing whitening was obtained. On the other hand, in Comparative Examples 1 to 7, ΔTt deteriorated more than -0.5%, and ΔHz increased by 1.0% or more.

[0063] In addition, the following was confirmed from Tables 1 and 2. (1) When the weaving density of the glass yarns (warp and weft) is 55 yarns / 25 mm or less and the diameter R of the glass yarns (warp and weft) is 80 μm or less, the occurrence of whitening can be suppressed. (2) When the ratio of the surface area of the glass yarns (total surface area of the warp and weft) to the volume of the fiber-reinforced resin layer is 9.5 mm -1 or more and 14.5 mm -1 or less (Examples 3 to 5, 7), a resin sheet having excellent appearance (high Tt) and good visibility (low Hz) was obtained.

[0064] In addition, in accordance with JIS L 1906 (General test method for nonwoven fabrics), when the stiffness and flexibility of each resin sheet of Examples 1 to 7 and Comparative Examples 1 to 7 were measured using a Gurley stiffness tester (Gurley stefness tester) manufactured by Toyo Seiki Co., Ltd., it was less than 1.5 mN in Examples 1 to 6, whereas it was 1.5 mN or more in Example 7 and Comparative Examples 1 to 7.

[0065] (Other embodiments) The resin sheet 10 of the above-described embodiment (including examples; the same shall apply hereinafter) can be used, for example, as a smoke-proof curtain, partition sheet, shutter material, etc. that require nonflammability.

[0066] FIG. 4 shows a configuration example of a smoke-proof curtain 100 using the resin sheet 10 of the above-described embodiment. As shown in FIG. 4, the smoke-proof curtain 100 includes a resin sheet 10 and a frame body 20 that holds the resin sheet 10. The frame body 20 may have a relay member 21 that relays the resin sheets 10 to each other and an adjustment member 22 that adjusts the tension of the resin sheet 10. In the configuration example of FIG. 4, a mode in which the frame body 20 surrounds the periphery of the resin sheet 10 is shown, but the structure of the frame body 20 is not limited to this mode. For example, the frame body 20 may be attached only to the upper side of the resin sheet 10, or to three sides, i.e., the upper side and both side sides. By using the resin sheet 10 of the above-described embodiment in which whitening hardly occurs, a smoke-proof curtain 100 having excellent appearance can be provided.

[0067] Furthermore, the resin sheet 10 of the above-described embodiment can also be used in applications that do not require nonflammability, such as clear partitions and splash prevention sheets.

[0068] As described above, the embodiments have been explained. However, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims. Also, the above embodiments may be combined or replaced as appropriate as long as the functions of the object of the present disclosure are not impaired. Furthermore, the descriptions such as "first", "second",... described above are used to distinguish the terms to which these descriptions are given, and do not limit even the number and order of those terms.

Explanation of Reference Numerals

[0069] 10 Resin sheet 11 Fiber-reinforced resin layer 12 Glass cloth 12a Warp 12b Weft 13 Resin layer 14 Other resin layer 15 Filament 20 Frame 21 Relay member 22 Adjusting member 100 Smoke curtain

Claims

1. A smoke-proof curtain wall comprising a resin sheet having a fiber-reinforced resin layer impregnated with resin in a glass cloth, and a frame for holding the resin sheet, wherein the weave density of the warp and weft constituting the glass cloth is 55 threads / 25 mm or less, the diameters R of the warp and the weft are 80 μm or less, the diameter R = 2×(100000000 / (100×π×L×d)) 0.5 (wherein L and d are the "length per unit weight (m / g)" and "specific gravity (g / cm 3 )" determined by the standard of the glass fiber used for the warp and the weft, and π represents the pi), one surface of the fiber-reinforced resin layer is exposed, another resin layer is laminated on the other surface of the fiber-reinforced resin layer, the ratio of the total surface area of the warp and the weft to the volume of the fiber-reinforced resin layer is 8 mm-1 or more, A smoke-proof curtain wall.

2. The resin sheet has a total light transmittance Tt of 85% or more, a haze Hz of 8% or less, and the changes in the total light transmittance Tt and the haze Hz ((value after the test) - (value before the test)) before and after the flexural resistance (cylindrical mandrel method) test conforming to JIS K 5600-5-1:1999 are defined as ΔTt and ΔHz, respectively. Then, ΔTt is -0.5% or more and 0% or less, and ΔHz is 0% or more and 1.0% or less. The smoke-proof curtain wall according to Claim 1.

3. the ratio is -1 9.5 mm -1 or more and 14.5 mm or less, The smoke-proof curtain wall according to Claim 1 or 2. The smoke-proof curtain wall according to any one of Claims 1 to 3.

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