Smoke-proof hanging wall construction method and smoke-proof hanging wall sheet

Abstract

To provide a non-inflammable sheet that effectively reduces dust deposition at low cost, and a smoke-blocking hanging wall comprising the non-inflammable sheet.SOLUTION: A sheet for smoke-blocking hanging walls comprises: a non-inflammable sheet comprising glass cloth and a resin layer that at least partially impregnates the glass cloth; and a protective film that coats and protects the non-inflammable sheet and is peeled off when the non-inflammable sheet is used. The protective film comprises a layer with an antistatic agent added thereto.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a sheet for a smoke barrier hanging wall and a smoke barrier hanging wall. [Background technology]

[0002] Smoke barriers are installed in the ceilings of buildings and other structures to prevent the spread of smoke in the event of a fire and ensure evacuation time. Traditionally, most of these were made of glass, but in recent years, secondary disasters caused by falling glass have become a problem, and as a result, smoke barriers made of non-flammable resin sheets are becoming more common.

[0003] In smoke barriers made of non-combustible sheets, the sheets can become statically charged, causing dust present in the air inside the building where the smoke barrier is installed to adhere to the surface of the non-combustible sheets, which can cause the building's appearance to deteriorate.

[0004] To address this problem, for example, Patent Document 1 (JP 2019-98646 A) discloses a non-combustible sheet having an antistatic layer containing a metal or metal oxide that serves as a surface layer when the non-combustible sheet is in use. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-98646 Summary of the Invention [Problem to be solved by the invention]

[0006] However, providing such an antistatic layer on a noncombustible sheet increases the manufacturing cost of the noncombustible sheet, and it is not always necessary to provide an antistatic layer on the main body of the noncombustible sheet in order to prevent dust from adhering to the noncombustible sheet.

[0007] Therefore, an object of the present invention is to provide a non-combustible sheet that can effectively reduce the adhesion of dust at low cost, and a smoke barrier hanging wall that includes this non-combustible sheet. [Means for solving the problem]

[0008] After extensive research, the inventors discovered that by providing an antistatic agent layer on the protective film side that is peeled off when the non-combustible sheet is used, rather than on the non-combustible sheet itself, it is possible to effectively reduce the adhesion of dust to the non-combustible sheet after installation, leading to the completion of the present invention.

[0009] That is, the present invention is a non-combustible sheet including a glass cloth and a resin layer at least partially impregnated into the glass cloth; a protective film that covers and protects the non-combustible sheet and is peeled off when the non-combustible sheet is used; the protective film includes a layer to which an antistatic agent is added; The present invention provides a sheet for smoke-proof hanging walls characterized by the above. Here, the layer to which the antistatic agent is added may be a surface layer, an adhesive layer, or an intermediate layer of the protective film.

[0010] In the smoke-proof hanging wall sheet of the present invention having such a configuration, the protective film is provided with antistatic properties, so static electricity is less likely to be generated on the non-flammable sheet during installation. Therefore, adhesion of dust and the like can be effectively prevented. Furthermore, since an antistatic agent layer is provided on the protective film side, it can be manufactured at low cost.

[0011] In the sheet for smoke-proof hanging walls of the present invention, the surface resistance of the protective film is 1.0 × 10 12 It is preferable that the resistance is Ω / □ or less.

[0012] According to the smoke barrier hanging sheet of the present invention having such a configuration, the protective film has a surface resistance value low enough to exhibit sufficient antistatic properties, and therefore good dust adhesion prevention properties can be obtained.

[0013] In addition, in the sheet for smoke barrier hanging walls of the present invention, it is preferable that the absolute value of the electrification voltage of the noncombustible sheet after the peel test described below is 0.4 kV or less. (Peeling test) The protective film is attached to the non-combustible sheet and left to stand for 2 hours or more in an environment of a temperature of 23±2°C and a humidity of (50±5)%, and then the protective film is peeled off at a speed of 3 m / min.

[0014] With the smoke barrier sheet for hanging walls of the present invention having such a configuration, the charged voltage of the non-combustible sheet after peeling off the protective film is sufficiently low and sufficient discharge occurs, thereby achieving good dust adhesion prevention.

[0015] The present invention also provides a smoke barrier hanging wall comprising any of the above-described sheets for smoke barrier hanging walls.

[0016] According to the smoke barrier hanging wall of the present invention having such a configuration, the protective film is provided with antistatic properties, so static electricity is less likely to be generated on the non-combustible sheet during installation. Therefore, adhesion of dust and the like can be effectively reduced, so the appearance is not impaired after installation. Furthermore, since the non-combustible sheet can be manufactured at low cost, the manufacturing cost of the smoke barrier hanging wall can be reduced. [Effects of the Invention]

[0017] According to the present invention, a non-combustible sheet that effectively reduces the adhesion of dust can be obtained at low cost, thereby facilitating the construction of a smoke barrier hanging wall. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a schematic diagram of a hanging smoke barrier 1 according to a first embodiment. [Figure 2] 1 is a cross-sectional view showing an example of a sheet 13 for a smoke barrier hanging wall used in the first embodiment. [Figure 3] FIG. 10 is a schematic diagram of a hanging smoke barrier 2 according to a second embodiment. [Figure 4]FIG. 10 is a cross-sectional view showing an example of a sheet 23 for a smoke barrier hanging wall used in the second embodiment. [Figure 5] FIG. 1 is an explanatory diagram of a method for measuring peeling electrification voltage. DETAILED DESCRIPTION OF THE INVENTION

[0019] Representative embodiments of the smoke barrier hanging wall sheet and smoke barrier according to the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to those shown in the drawings. Furthermore, since each drawing is intended to conceptually explain the present invention, the proportions and quantities of parts may be exaggerated or simplified as necessary to facilitate understanding. Furthermore, in the following description, the same or equivalent parts will be designated by the same reference numerals, and duplicate explanations may be omitted.

[0020] 1. Embodiment 1 A smoke barrier wall 1 according to embodiment 1 will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a schematic diagram of the smoke barrier wall 1 according to embodiment 1, and Fig. 2 is a cross-sectional view showing an example of a sheet 13 for the smoke barrier wall used in embodiment 1.

[0021] 1-1. Smoke barrier hanging wall 1 The hanging smoke barrier 1 is attached to a ceiling or the like so as to extend downward in a substantially vertical direction, and prevents the flow and diffusion of smoke in the event of a fire. As shown in Figure 1, the smoke barrier hanging wall 1 is a panel-type smoke barrier hanging wall that includes a substantially rectangular frame 11 made of a metal material such as aluminum, and a sheet material (smoke barrier hanging wall sheet 13) attached to the frame 11.

[0022] The frame 11 includes a pair of opposing vertical frames 111, 112 and a pair of opposing horizontal frames 113, 114. The frame 11 may be configured so that its length in the vertical direction (up and down direction) and horizontal direction can be adjusted by a vertical frame position adjustment means (not shown) and a horizontal frame position adjustment means (not shown).

[0023] 1-2. About Smoke Barrier Hanging Wall Sheet 13 2, the sheet 13 for the smoke barrier hanging wall is a laminated body in which a non-combustible sheet 131 is sandwiched between protective films 132. When constructing the smoke barrier hanging wall 1, the protective film 132 is peeled off and only the non-combustible sheet 131 is installed.

[0024] Specifically, the noncombustible sheet 131 includes a glass cloth (glass fiber cloth) 133 and a resin layer 134 in which at least a portion of the glass cloth 133 is impregnated. In other words, the noncombustible sheet 131 can also be said to be a laminate of the glass cloth 133 and the resin layer 134.

[0025] The glass cloth 133 is a sheet-like material made of a plurality of glass fibers that are intertwined to form a single piece of cloth. For example, it may be made of a plurality of warp threads and a plurality of weft threads made of glass fibers. The weave is not particularly limited, and examples thereof include plain weave, satin weave, twill weave, basket weave, and rib weave.

[0026] The resin forming the resin layer 134 may be either a thermosetting resin or a thermoplastic resin as long as it does not impair the effects of the present invention, but from the viewpoint of non-flammability, a thermosetting resin is preferred, such as a vinyl ester resin, a urethane acrylate resin, a fluorene acrylate resin, an unsaturated polyester resin, a curable acrylic resin, an epoxy resin, etc. Among these, a vinyl ester resin is preferred because of its excellent transparency after impregnation into the glass cloth.

[0027] Furthermore, the resin of the resin layer 134 fills the gaps between the multiple glass fibers that make up the glass cloth 133, and may extend from one surface side portion of the resin layer 134 to the other surface side portion through the gaps.

[0028] In this embodiment, the resin layer 134 is formed on both surfaces (outer surfaces) of the glass cloth 133, but this is not limited thereto, and it may be formed on one surface or may be formed as an intermediate layer. In order to protect the glass cloth 133, a protective layer (not shown) such as a PET film may be laminated on the surface of the glass cloth 133.

[0029] The protective film 132 is laminated (attached) to the noncombustible sheet 131 to cover and protect it, and is peeled off when the noncombustible sheet 131 is to be used. The protective film 132 includes a layer 136 to which an antistatic agent is added. In other words, the protective film 132 can also be said to be an antistatic film to which antistatic (antistatic) properties have been added. The antistatic agent may also be added to the noncombustible sheet 131, but from the viewpoint of cost reduction, etc., it is preferably added only to the protective film 132.

[0030] For example, protective film 132 is configured as a laminate of a layer (layer 136) in which a polymeric antistatic agent is added to a base resin such as polyethylene, an intermediate layer made of a base resin such as polyethylene, and an adhesive layer made of an adhesive resin such as ethylene vinyl acetate copolymer resin (EVA). However, the number of layers constituting protective film 132 can be adjusted as appropriate within a range that does not impair the effects of the present invention, and the antistatic agent may be added to any layer of protective film 132, not limited to the outer layer (surface layer), but also to the adhesive layer or intermediate layer.

[0031] Examples of polymeric antistatic agents include polymeric materials in which hydrophilic segments such as polyethylene oxide (PEO) chains are incorporated into the molecule as conductive units, and various types can be used as long as the effects of the present invention are not impaired. For example, nonionic types including polyetheresteramide types, ethylene oxide-epichlorohydrin types, and polyetherester types, anionic types including sulfonic acid types such as polystyrene sulfonic acid, and cationic types including quaternary ammonium salt types can be used. Molecular bonds in the polymer chain may be formed by metal ions.

[0032] Specific examples include polyethylene oxide, polypropylene oxide, polyether ester amide, ethylene oxide-epihalohydrin copolymer, ethylene (meth)acrylate copolymer, methoxypolyethylene glycol (meth)acrylate copolymer, quaternary ammonium base-containing (meth)acrylate copolymer, quaternary ammonium base-containing maleimide copolymer, quaternary ammonium base-containing methacrylimide copolymer, polysodium styrene sulfonate, carbobetaine graft copolymer, polyacrylate, polystyrene sulfonate, polystyrene sulfonate amine salt, alternating block copolymer of a styrene polymer block and a hydrophilic polymer block, having styrene as an essential constituent monomer, resin in which a (meth)acrylic acid ester in which polyethylene glycol has been introduced has been grafted onto a polystyrene resin, hydrophilic polymer in which a polyether compound is used as an antistatic segment, polymaleate, polymaleic acid amine salt, cationic polymer having an ammonium ion as the main component, polyamide polyether copolymer, polyolefin polyether copolymer, polyether ester amide or polyether ester.

[0033] Furthermore, the antistatic agent is not limited to a polymer type (organic type) and may be a metal (inorganic type). Examples of metal elements constituting a metal-based antistatic agent include Ag, Ni, Cu, Sn, Sb, Al, In, and Ti, and examples of metal elements having a standard electrode potential of less than 0 eV when taken as a simple metal include metal compounds such as antimony pentoxide, tin oxide, zinc oxide, indium oxide, antimony-doped indium oxide, tin-doped indium oxide, and silver oxide.

[0034] The adhesive layer is not limited to EVA, and may be made of, for example, polyolefin, synthetic rubber, polyurethane, polyamide, polyester, or acrylic.

[0035] From the viewpoint of ensuring the anti-static property to prevent adhesion of dust and the like, the surface resistance value of the protective film 132 is 1.0×10 12It is preferable that the resistance is Ω / □ or less, and in particular, 1.0×10 9 ~1.0×10 12 It is preferable that the resistance is about Ω / □, and 1.0×10 10 ~1.0×10 12 It is more preferable that the absolute value of the charged voltage of the non-combustible sheet 131 immediately after peeling off the protective film 132 is 0.4 kV or less, and more preferably 0.2 kV or less. The lower limit may be 0 kV.

[0036] 1-3. Construction of smoke-proof hanging walls 1 Next, a method for constructing the smoke barrier hanging wall 1 will be described. First, prepare the smoke barrier hanging wall 1. The smoke barrier hanging wall 1 may be of a type in which the smoke barrier hanging wall sheet 13 is integrated with the frame 11 at the time of shipment, or of a type in which the smoke barrier hanging wall sheet 13 is attached to the frame 11 at the construction site.

[0037] At the work site, the protective film 132 is peeled off from the non-combustible sheet 131 of the smoke barrier hanging wall sheeting 13. At this time, it is assumed that sufficient discharge has occurred several minutes after the protective film 132 has been peeled off. In other words, the antistatic agent added to the protective film 132 removes static electricity that is generated when the protective film 132 is peeled off, thereby effectively preventing dust and the like from adhering to the non-combustible sheet 131.

[0038] In addition, for the smoke barrier hanging wall sheet 13 that is attached to the frame 11 on-site, a non-combustible sheet 131 is further attached to the frame 11 using a fixing means such as double-sided tape. At this time, the non-combustible sheet 131 is sufficiently discharged, so it is prevented from sticking due to static electricity.

[0039] Furthermore, if the frame 11 has a vertical frame position adjustment means (not shown) and a horizontal frame position adjustment means (not shown), the positions of the vertical frames 111, 112 and the horizontal frames 113, 114 can be adjusted using these means to adjust the tension applied to the non-combustible sheet 131 and eliminate wrinkles and sagging in the non-combustible sheet 131.

[0040] A smoke barrier section can be set at a desired location by connecting multiple smoke barrier hanging walls 1 assembled in this way with rails, joints, etc. and attaching them so that they extend vertically downward from a ceiling, etc. The attached non-combustible sheet 131 is unlikely to become electrically charged by the air currents in the room, so the adhesion of dust and the like to the non-combustible sheet 13 is prevented even after the smoke barrier hanging walls 1 are installed.

[0041] 1-4. Effects of the First Embodiment According to the first embodiment, since the protective film 132 has antistatic properties, static electricity is less likely to be generated on the noncombustible sheet 131 during installation. Therefore, dust is less likely to adhere to the noncombustible sheet 131 during installation and after installation. Therefore, the installation of the noncombustible sheet 131 can be easily performed, and the appearance of the noncombustible sheet 131 can be maintained by preventing the adhesion of dust and the like even after installation. Furthermore, the non-combustible sheet 131 is transparent and highly visible, and is also lightweight and will not break even if dropped, so it goes without saying that it is safe.

[0042] 2. Embodiment 2 The smoke barrier hanging wall 2 according to the second embodiment will be described with reference to Fig. 3 and Fig. 4. However, the following description will focus on the differences from the first embodiment. Fig. 3 is a schematic diagram of the smoke barrier hanging wall 2 according to the second embodiment, and Fig. 4 is a cross-sectional view showing an example of a sheet 23 for the smoke barrier hanging wall used in the second embodiment.

[0043] 2-1. About Smoke Barrier Hanging Wall 2 3, the smoke barrier hanging wall 2 includes a pair of opposing vertical frames 21, 22 and a sheet 23 for the smoke barrier hanging wall that is fixed in a tensioned state between the vertical frames 21, 22. In other words, the smoke barrier hanging wall 2 is a tension type.

[0044] 2-2. About Smoke Barrier Hanging Wall Sheet 23 4, the sheet 23 for the smoke barrier hanging wall is a laminated body in which a non-combustible sheet 231 is sandwiched between protective films 232 (antistatic films). However, the protective film 232 may be formed on only one surface of the non-combustible sheet 231. When constructing the smoke barrier hanging wall 2, the protective film 232 is peeled off from the non-combustible sheet 231, and only the non-combustible sheet 231 is constructed.

[0045] The tension-type non-combustible sheet 231 includes a glass cloth 233, a resin layer 234 at least partially impregnated in the glass cloth 233, and laminated PET (polyethylene terephthalate) film layers 235 on both surface sides. The laminated PET film layers 235 provide the non-combustible sheet 231 with rigidity that can withstand the tension when installed.

[0046] The protective film 232 covers and protects the non-combustible sheet 231, and is peeled off when the non-combustible sheet 231 is used. The protective film 232 includes a layer 236 to which an antistatic agent is added.

[0047] The protective film 232 is configured as a laminate of an outer layer (layer 236) made of polyethylene with an antistatic agent added, an intermediate layer made of polyethylene, and an adhesive layer made of EVA. However, the antistatic agent is not limited to being added to the outer layer (surface layer) of the protective film 232, but may also be added to the adhesive layer or the intermediate layer. As described above, various antistatic agents can be added, and various materials can be used as the adhesive layer material, not just EVA.

[0048] From the viewpoint of preventing adhesion of dust and the like, the surface resistance value of the protective film 232 is set to 10 12 It is preferably Ω / □ or less, and more preferably 1.0×10 9 ~1.0×10 12 It is preferable that the resistance is about Ω / □, and 1.0×10 10 ~1.0×10 12It is more preferable that the absolute value of the electrification voltage of the non-combustible sheet 231 immediately after the protective film 232 is peeled off is preferably 0.4 kV or less, and particularly preferably 0.2 kV or less.

[0049] 2-3. Construction of Smoke Barrier 2 Next, a method for constructing the smoke barrier hanging wall 2 will be explained. First, the vertical frames 21, 22 and the sheet 23 for the smoke barrier hanging wall that constitute the smoke barrier hanging wall 2 are prepared. At the work site, the protective film 232 is peeled off from the non-combustible sheet 231 of the smoke barrier hanging wall sheet 23. At this time, the antistatic agent added to the protective film 232 removes static electricity that is generated when the protective film 232 is peeled off, thereby effectively preventing the adhesion of dust and the like.

[0050] Next, the non-combustible sheets 231 are attached to the vertical frames 21 and 22. At this time, the work is easy because the non-combustible sheets 231 are free of static electricity and do not stick to each other or other objects.

[0051] The smoke-proof compartment can be set in the desired position by attaching the vertical frames 21, 22 to a supporting material such as a wall. The attached non-combustible sheet 231 is unlikely to become electrically charged by the air currents in the room, so it is possible to prevent dust and other particles from adhering to it even after installation.

[0052] 2-4. Effects of the Second Embodiment According to the second embodiment, since the protective film 232 has antistatic properties, static electricity is less likely to be generated on the noncombustible sheet 231 during installation. Therefore, dust is less likely to accumulate on the noncombustible sheet 231 during installation and after installation. Therefore, the installation of the noncombustible sheet 231 can be easily performed, and the appearance of the noncombustible sheet 231 can be maintained even after installation.

[0053] Although the representative embodiments of the present invention have been described above, the present invention is not limited to these, and various design modifications are possible. It goes without saying that such modified forms (variations) of the design are also included in the technical scope of the present invention. For example, the smoke-proof hanging wall sheet 13 of the first embodiment may be attached to the vertical frames 21 and 22 of the second embodiment, or the smoke-proof hanging wall sheet 23 of the second embodiment may be attached to the frame 11 of the first embodiment. [Example]

[0054] The present invention will be described in detail below with reference to examples and comparative examples. The examples are not limiting.

[0055] (1) Protective film (1-1) As the protective film 1, a PE (polyethylene) antistatic protective film (manufactured by Enshu Chemical Industry Co., Ltd., product number: EH-50-10CN, transparent, containing antistatic agent) having the following specifications was used. - PE antistatic protective film specifications Outer layer: Polyethylene + polymer antistatic agent Middle layer: Polyethylene (PE) Adhesive layer: Ethylene vinyl acetate copolymer (EVA) (Total thickness: 50 μm) In other words, PE antistatic protective film is a three-layer co-extruded film with an antistatic agent added to the surface layer, and the antistatic agent used is a polymeric antistatic agent (a type of resin in which the molecules of copolymers such as EMA (ethylene-methyl acrylate copolymer) and EAA (ethylene-acrylic acid copolymer) are bonded together with metal ions).

[0056] Here, the surface resistance of the protective film 1 was measured by the following method (the same applies to the following protective films), and was found to be 1.0 × 10 10 It was Ω / □. - Measuring equipment: Nitto Seiko Analic Co., Ltd., product number: MCP-HT450 - Measurement method: Compliant with JIS K 6911, measured at an applied voltage of 500V under an environment of temperature 23±2°C and humidity (50±5)%.

[0057] (1-2) As the protective film 2, a polyolefin antistatic protective film (manufactured by Nitto Denko Corporation, product number: E-MASK RB-100S) having the following specifications was used. - Polyolefin antistatic protective film specifications Polyolefin, an organic antistatic agent layer, and an acrylic adhesive layer laminated in this order (Total thickness: 45 μm) Surface resistance: 6.3 x 10 11 Ω / □

[0058] (1-3) As a comparative protective film 1, the following PET film (product number: Emblet S, manufactured by Unitika Ltd.) was used. - PET film specifications 25μm thick PET film with no surface treatment such as corona Surface resistance: >1.0×10 13 Ω / □

[0059] (1-4) As a comparative protective film 2, the following PE protective film (1) (manufactured by Enshu Chemical Industry Co., Ltd., product number: EH-50-10CN) was used. - PE Protective Film (1) Specifications PE and EVA laminate (total thickness: 50 μm) Surface resistance: >1.0×10 13 Ω / □

[0060] (1-5) As a comparative protective film 3, the following PE protective film (2) (manufactured by Nitto Denko Corporation, product number: E-MASK R-50EP) was used. - PE Protective Film (2) Specifications PE and acrylic adhesive laminate (total thickness: 60 μm) Surface resistance: >1.0×10 13 Ω / □

[0061] (2) Non-flammable sheet Next, as the non-combustible sheets, a non-combustible sheet for panels corresponding to embodiment 1 and a non-combustible sheet for tension corresponding to embodiment 2 were used. The specifications of the non-combustible sheets used are as follows: (2-1) Non-flammable sheet for panels "Dance Smoke N Panel Sheet" manufactured by Takiron C.I. Co., Ltd. PET (polyethylene terephthalate) film (25 μm), Glass cloth / vinyl ester resin composite sheet (85 μm), and A non-flammable sheet made of a laminate of PET films (25 μm) stacked in this order.

[0062] (2-2) Non-flammable tension sheet "Dance Smoke N Tension Sheet" manufactured by Takiron C.I. Co., Ltd. Laminated PET film (PET: 16 μm, acrylic adhesive layer: 15 μm), Glass cloth 133 / vinyl ester resin composite sheet (85 μm), and A non-flammable sheet made of a laminated body consisting of laminated PET film (PET: 16 μm, acrylic adhesive layer: 15 μm) in this order.

[0063] <Examples 1 to 4> The protective film 1 was laminated onto one side of each of the non-combustible sheets 1 and 2 to prepare the sheets 1 and 2 for smoke barrier hanging walls of the present invention. Furthermore, protective film 2 was attached to one side of each of non-combustible sheets 1 and 2 to form laminated sheets 3 and 4 for smoke barrier hanging walls of the present invention.

[0064] <Comparative Examples 1 to 6> Comparative protective film 1 was laminated onto one side of each of non-combustible sheets 1 and 2 to prepare comparative sheets for smoke-proof hanging walls 1 and 2. Comparative protective film 2 was laminated onto one side of each of non-combustible sheets 1 and 2 to prepare comparative sheets 3 and 4 for smoke-proof hanging walls. Furthermore, comparative protective film 3 was laminated onto one side of each of non-combustible sheets 1 and 2 to prepare comparative smoke barrier sheets 5 and 6.

[0065] [evaluation] For the above-mentioned smoke-proof hanging wall sheets 1 to 4 of the present invention and the comparative smoke-proof hanging wall sheets 1 to 6, a peeling test was carried out to peel the protective film from each noncombustible sheet, and the charged voltage of the noncombustible sheet after peeling was measured. The test conditions were as follows (see Figure 5): - Measuring equipment: SIMCO static electricity measuring instrument FMX-003 - Measurement conditions: After preparation, smoke barrier hanging wall sheets 1 to 4 and comparative smoke barrier hanging wall sheets 1 to 6 were left for at least two hours in an environment with a temperature of 23±2°C and a humidity of (50±5)%. Then, under the same conditions, the protective film was peeled off by hand at a speed of 3 m / min, and the maximum peel electrification voltage was read. The distance D between the measuring device M and the non-combustible sheet was 100 mm. Measurements were taken at three points on an A4-sized sample: the corner, the center, and the diagonal. The measurement results are shown in Table 1 together with the surface resistance value of each protective film.

[0066] [Table 1]

[0067] From Table 1, the surface resistance of protective films 1 and 2 according to Examples 1 to 4 was 1.0 × 10 12 Ω / □ or less, whereas the surface resistance of comparative protective films 1 to 3 according to comparative examples 1 to 6 was 1.0 × 10 13 It is larger than Ω / □. Generally, the lower the surface resistance of a protective film, the better the antistatic properties. Therefore, it can be seen that the protective films of Examples 1 to 4 exhibited better antistatic properties than the comparative protective films 1 to 3 of Comparative Examples 1 to 6.

[0068] It is generally known that the smaller the absolute value of the electrostatic charge, the better the resistance to adhesion of dust, etc. As can be seen from Table 1, in Examples 1 to 4, the electrostatic charge of the noncombustible sheets 1 and 2 after peeling off the protective films 1 and 2 was smaller than that of Comparative Examples 1 to 6, confirming that they exhibit sufficient resistance to adhesion of dust, etc. It was also confirmed that in the noncombustible sheets 1 and 2 according to Examples 1 to 4, discharge was completed within a few minutes after peeling off the protective films 1 and 2. [Explanation of symbols]

[0069] 1,2 Smoke barrier 13,23 Smoke-proof hanging wall sheet 131,231 Non-flammable sheet 132,232 protective film 133,233 Glass cloth 134,234 Resin layer 136,236 Layer with added antistatic agent

Claims

1. a non-combustible sheet including a glass cloth and a resin layer at least partially impregnated into the glass cloth; a protective film that covers and protects the non-combustible sheet and is peeled off when the non-combustible sheet is used; a frame to which the non-flammable sheet is attached; Equipped with When constructing a smoke barrier using a sheet for a smoke barrier, the protective film of which contains a layer to which an antistatic agent is added, The protective film is peeled off from the non-combustible sheet in advance, and the discharge is performed after the application. A construction method for a smoke-proof hanging wall characterized by the above.

2. The surface resistance of the protective film is 1.0×10 １２ Ω / □ or less, 2. A method for constructing a smoke barrier hanging wall according to claim 1.

3. the absolute value of the electrostatic potential of the non-combustible sheet after the peel test described below is 0.4 kV or less; 3. A method for constructing a smoke barrier hanging wall according to claim 1 or 2, characterized by: (Peeling test) The protective film is attached to the non-combustible sheet and left to stand for 2 hours or more in an environment of a temperature of 23±2° C. and a humidity of (50±5)%, and then the protective film is peeled off at a speed of 3 m / min.

4. A non-flammable sheet comprising a glass cloth and a resin layer at least partially impregnated in the glass cloth, the non-flammable sheet being attached to a frame; a protective film that covers and protects the non-combustible sheet and is peeled off when the non-combustible sheet is used; Equipped with the resin forming the resin layer is a vinyl ester resin, a urethane acrylate resin, a fluorene acrylate resin, an unsaturated polyester resin, a curable acrylic resin, or an epoxy resin; the protective film includes a layer containing an antistatic agent and has a surface resistance value of 1.0×10 9 Ω to 1.0×10 12 Ω / □; the absolute value of the electrostatic potential of the non-combustible sheet after the peel test described below is 0.4 kV or less; A smoke-proof sheet for hanging walls characterized by the above. (Peeling test) The protective film is attached to the non-combustible sheet and left to stand for 2 hours or more in an environment of a temperature of 23±2° C. and a humidity of (50±5)%, and then the protective film is peeled off at a speed of 3 m / min.

5. The absolute value of the charged voltage of the non-combustible sheet after the peel test described below is 0.2 kV or less, 5. The sheet for a smoke barrier hanging wall according to claim 4,

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