JP5304607B2 - Bond sheet for antistatic sheet shutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an explosion-proofing joint sheet for an antistatic sheet shutter, wherein electric conductivity is provided on both front and back sides of the whole including a joint portion by improving an electrically joining state, thereby making the antistatic sheet shutter surely antistatic. <P>SOLUTION: The joint sheet 1 is wound around an electrically-earthed rotatable winding drum made of an aluminum alloy, so that the antistatic sheet shutter opens/closes by winding or winding it back. In the joint sheet 1, edges of a plurality of conductive sheets 3 and 4 are overlapped and then welded or sewn on a stitch line 11, so as to electrically connect them by, for example, overlapping the sewing lines 8 of the opposing edges, thereby an electric charge can be shifted across the whole surface between the conductive sheets 3 and 4. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an antistatic sheet shutter installed at a doorway of a building such as a factory or a warehouse, and a conductive bonding sheet used therefor.

In general, factories and warehouses that frequently open and close doorways are provided with sheet shutters that are lighter and can be opened and closed at a relatively high speed compared to iron shutters.
Such seat shutters are used for various purposes such as maintaining indoor temperature, preventing leakage of production gas into the environment, preventing noise, and preventing insects and dust from entering from outside the building.

A normal sheet used for such a sheet shutter is formed of a composite sheet in which a plastic film such as vinyl chloride is bonded to a base fabric (base material) made of fiber such as cotton, synthetic fiber or glass fiber, and the strength is increased as much as possible. To reduce weight.
However, when the sheet shutter is opened and closed, if the plastic composite sheet is rubbed with each other, static electricity is likely to be accumulated on the sheet.

  The accumulated static electricity may be discharged, so in a factory where flammable gas may accumulate, the sheet itself should have a function to suppress the generation of static electricity as much as possible, or the generated static electricity will be removed. It is necessary to provide an antistatic function.

  For example, in order to give an antistatic function to a sheet, an antistatic agent such as a surfactant is blended in a plastic sheet that forms both the front and back surfaces of the sheet, and self-discharge (corona discharge) is promoted. A method of discharging static electricity little by little is known.

  However, the antistatic property due to the self-discharge property is easily affected by the humidity in the air, and it takes a considerable time to sufficiently discharge and remove static electricity.

  Also, the conductive material (carbon black, metal powder, etc.) is held in a dispersed state so that the entire synthetic resin sheet is conductive, or the conductive material is printed on the surface of the sheet in a net pattern or a thin film. It is also known to remove electricity from a sheet as quickly as possible by applying it in the form of a conductive material (Patent Document 1).

  As shown in FIG. 6, in such a sheet for a sheet shutter, a plurality of strip-shaped sheets of material are cut to be aligned with the width of the shutter opening, and are joined in the width direction of the strip-shaped sheet to cover the entrance / exit. It is prepared in the joining sheet | seat 22 connected with the magnitude | size which can be. The joining of the joining sheets 22 is usually performed by superimposing the edge portions of two sheets and heat-welding them so that the superposed surfaces are electrically connected to each other.

  As shown in FIG. 7, the antistatic sheet shutter has an electrical path from a conductive joining sheet 22 in which a plurality of sheets are connected to the ground (ground). The electrical path is from the surface of the conductive winding drum 2 such as an aluminum alloy in which an end portion of the joining sheet 22 is fixed with a metal bolt 20 from an arbitrary surface of the joining sheet 22 through a conduction portion. It is grounded directly via an electric cord or the like, or is electrically connected from the shaft of the take-up drum 2 to a support frame 21 made of a conductive metal such as iron that supports the entire sheet shutter. When it is fixed to the grounding surface such as inside, it is grounded.

JP 2007-113298 A (refer to claim 18)

  However, as shown in FIG. 6, in the joining sheet 22 that is simply joined by welding with the end portions overlapped like a width joint, the front and back surfaces are not electrically connected. Of the sheet surfaces (total of 4 surfaces), the overlapped surfaces are not electrically connected to each other, and three electrically independent surfaces are formed. Therefore, as shown in FIG. As a result, the sheet shutter cannot be grounded efficiently.

  As described above, in the antistatic sheet shutter in which the front and back surfaces of the joining sheet are not electrically connected, dust may be attracted to a portion where static electricity is charged and the shutter may be inferior in dustproof property. In facilities that may be included in the atmosphere, it is necessary to further improve antistatic properties in order to prevent electrostatic discharge.

  Accordingly, the object of the present invention is to solve the above-described problems and improve the state of electrical bonding between the grounded surfaces in order to more reliably prevent the antistatic sheet shutter bonding sheet. It is assumed that it is electrically connected to both the front and back surfaces of the joining sheet that is connected and integrated by welding two sheets, or other than the joining part (single part), thereby ensuring reliable antistatic and explosion-proof charging A preventive sheet shutter.

  In order to solve the above-described problems, in the present invention, an antistatic sheet shutter that opens and closes by winding or rewinding a joining sheet in which a plurality of conductive sheets are joined to a rotatable winding drum. In the bonding sheet used in the above, the conductive sheet is made of a conductive wire that penetrates the front and back surfaces in a mesh shape on both the front and back surfaces so that the charge can be moved between the front and back surfaces, The joint sheet is formed by joining edges of a plurality of the conductive sheets, and electrically connecting sewing lines of the stacked conductive sheets. It is used as a joining sheet.

  Since the conductive sheet used for the joining sheet of the present invention configured as described above is provided with sewing lines made of conductive yarns penetrating the front and back surfaces in a mesh pattern on both front and back surfaces, the front and back surfaces are conductive. Electrically conducted by the yarn, the electric charge can move between the front and back surfaces via the conductive yarn, and the mesh of the conductive yarn is arranged on the front and back surfaces. Charges are wide and can be moved on the front and back surfaces.

  And since the joining sheet | seat of this invention overlaps and joins the edges of the said some conductive sheet, and electrically connects the sewing line of the laminated | stacked conductive sheet, it is one side of a conductive sheet. The surface is electrically connected to one surface of the other conductive sheet via the back surface, and the one surface of the other conductive sheet is electrically connected to the back surface.

Thereby, the surface of the joining sheet in which the two conductive sheets are joined together is not only electrically connected to the back surface of the same conductive sheet, but is also electrically connected to the front surface and the back surface of the other conductive sheet to constitute the joining sheet. If any one of the plurality of conductive sheets is grounded, the entire surface of the bonding sheet is grounded to prevent charging.
In addition, as a result, the grounding, which conventionally required about three places for antistatic, can sufficiently exhibit the antistatic function in only one place in the present invention.

  As the sewing line, it is preferable to employ a sewing line in which an upper thread and a lower thread are entangled by a main sewing or a chain stitch with a sewing machine in order to increase conductivity and efficiently manufacture the sewing line. That is, by using such an antistatic sheet shutter joining sheet on which such a sewing line is formed, a mesh-like sewing line made of conductive thread on the front and back surfaces of the conductive sheet can be efficiently obtained by means of sewing sewing. The mesh can be produced in any size, shape, and arrangement, and the sewing line can be provided in a known form such as a dotted line, a chain line or a continuous line.

Furthermore, when the sewing line is a sewing line having a mesh size of 500 cm ² or less in the mesh area, a sheet shutter joining sheet having excellent antistatic properties can be produced.

  Moreover, it is preferable that the conductive sheet is formed by coating a sheet base material with a thermoplastic resin, and the bonding sheet is a bonding sheet in which a plurality of conductive sheets are bonded by welding of the thermoplastic resin. This is because when a plurality of sheets are joined together to form a joining sheet, the sewing lines that are opposed to each other with their edges overlapped can be brought into contact with each other, and in this state, the thermoplastic resin can be welded and joined together. This is because an electrically connected state can be obtained easily and reliably between the conductive sheets.

  By using the bonding sheet for the antistatic sheet shutter configured as described above, the antistatic sheet shutter can be opened and closed by winding or rewinding on an electrically grounded and rotatable winding drum. An antistatic sheet shutter with improved safety and high safety can be obtained.

  In this invention, a conductive sheet used for an antistatic sheet shutter is provided with a sewing line made of conductive thread on the front and back surfaces of a sheet base material coated with a synthetic resin, and the joining sheet is Since the edges of the plurality of conductive sheets are overlapped and the sewing lines of the stacked conductive sheets are electrically connected to each other, the electric charge of the joining sheet obtained by joining the plurality of conductive sheets is reliably moved on all surfaces. Accordingly, there is an advantage that the number of grounds required for the antistatic sheet shutter can be reduced to a minimum of one place and the antistatic can be surely performed.

  In addition, there is an advantage of using an antistatic sheet shutter with improved antistatic properties and high safety using such a bonding sheet.

Sectional drawing on the sewing line of the electroconductive sheet used for embodiment The perspective view which expands and shows the edge of the joining sheet of an embodiment (a) (b) is sectional drawing on the sewing line which each shows embodiment of an electroconductive sheet Enlarged perspective view of an edge showing an embodiment of a conductive sheet Schematic side view showing the winding structure of the antistatic sheet shutter of the embodiment The perspective view which shows the electroconductive sheet of a prior art example, and expands and shows the edge part of an electroconductive sheet Schematic side view showing a winding structure of a conventional antistatic sheet shutter

Embodiments of an antistatic sheet shutter bonding sheet and an antistatic sheet shutter according to the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1, 2, and 5, the antistatic sheet shutter joining sheet 1 according to the first embodiment is formed by bonding conductive sheets 3, 4, 5, and 6 (see FIG. 5). The sheet shutter 7 is an antistatic sheet shutter 7 which is wound around an electrically grounded rotatable aluminum alloy winding drum 2 and wound or rewound to be opened and closed.

As shown in FIG. 1, the conductive sheet 3 has a three-layer structure in which a thermoplastic resin layer 3 b is coated on both front and back surfaces of a sheet base material 3 a such as a woven fabric that serves as a core material for maintaining the strength of the entire sheet. It is made of a material provided with a base material, and a sewing wire 8 using a conductive thread penetrating the front and back surfaces is provided in a square mesh pattern on both front and back surfaces so that electric charges can be moved between the front and back surfaces. Yes.
For example, a cloth knitted with glass fiber, cotton fiber, or synthetic fiber is adopted as the sheet base material 3a, and the thermoplastic resin layer 3b can be exemplified by a thermoplastic resin such as polyvinyl chloride.

  Examples of the thermoplastic resin include polyvinyl chloride vinyl resins having good weldability, olefin resins such as polyethylene and polypropylene, nylon, urethane, and acrylic resins. Further, if necessary, carbon black, copper, nickel, aluminum or powders of these conductive compounds can be incorporated into the thermoplastic resin as a conductive material. In this way, the conductivity of the entire sheet surface is further increased.

  Such conductive sheets 3, 4, 5, 6 are all made of the same material. In addition to the above-described examples, well-known materials such as a sheet base material and a thermoplastic resin are required for conditions such as required strength of the sheet shutter. It is also possible to employ depending on the situation.

  As another embodiment of the conductive sheets 9 and 10 as shown in FIG. 3, two or more thermoplastic resin layers 9b and 9c are provided on both front and back surfaces of the sheet base material 9a and 10a coated with the thermoplastic resin. 10b and 10c may be provided, and they may be formed separately by forming a thin thermoplastic resin layer with good heat-weldability and laminating the thermoplastic resin layer on the surface of the thermoplastic resin layer.

  In addition, as shown in FIG. 2, the joining sheet 1 is formed by overlapping the edges of the plurality of conductive sheets 3 and 4 and welding them with a heat sealer or by sewing (sewing line 11 in FIG. 2). Examples are those in which the joining lines 8 are overlapped and electrically connected by overlapping the sewing lines 8 at the opposite ends so that the charge can be moved between the conductive sheets 3 and 4.

For the sewing involved in the joining, conductive yarn such as metal thread is usually used. In order to increase the joining strength between the conductive sheets 3 and 4, it is non-conductive as necessary, but has excellent strength. It is also possible to use synthetic fiber yarns.
The sewing line 8 only needs to be in a series of states in which the conductive thread is electrically conductive, and the sewing form thereof is, for example, an arbitrary shape formed in a broken line shape (FIG. 2), a chain line shape, or a continuous line shape. It may be a sewing line.

By the way, the conductive yarn itself is a well-known material. Metal yarn made of copper or stainless steel, metal yarn mixed with natural fiber or synthetic fiber and twisted, or acrylic fiber or nylon fiber with copper sulfide. A chemically bonded organic conductive fiber (for example, Sanderon (registered trademark), manufactured by Nippon Shah Dyeing Co., Ltd.) or the like can be used.
The sewing line 8 is preferably formed by a sewing machine with good manufacturing efficiency, but may be manufactured by hand-sewing if necessary.

As shown in FIGS. 1 and 3 (a), the form of the sewing line 8 formed by the sewing machine is referred to as main sewing, or is referred to as ring stitching as shown in FIG. 3 (b). Is mentioned.
In these, one or both of the upper thread 8a and the lower thread 8b have linked loop portions that penetrate the sheet base materials 3a, 9a, and 10a, whereby the upper thread 8a and the lower thread 8b are sufficiently electrically connected at a number of locations. A continuous linear sewing machine line is formed on the sheet surface and is almost uninterrupted. The electric charge moves between the front and back surfaces of the sheet via the sewing line 8 in the vicinity of the sewing line 8 or from the mesh-shaped circle surrounded by the circle, and further flows to a grounded conductive path.

In order to provide the sewing line 8 in a square mesh shape, a plurality of sewing lines 8 are formed in parallel to one direction of the sheet surface, and further, a plurality of parallel lines in the other direction so as to intersect at right angles or at an appropriate angle. The sewing line 8 may be provided by sewing. The shape and size of such a mesh is not limited to a square shape, and a desired size mesh can be selectively employed in an arbitrary shape for forming a surface with which required conductivity can be obtained.
For example, the sewing line can be formed in a curved shape, and the mesh shape can be a ring shape made up of a curve such as a circle or an ellipse. Further, as shown in FIG. 4, the sewing line 8 may be provided in a bias shape that intersects with the longitudinal direction of the conductive sheet 12 in an oblique direction.

Further, the size of the mesh is preferably 500 cm ² or less in order to have a practical antistatic function, and the edges of the conductive sheets 3 and 4 (FIG. 2) It is preferable for the practical configuration of the seat shutter 7 that the portion without the sewing line 8 has a width of 2 cm or less.

  As shown in FIG. 2, in the bonding sheet 1, one side surface of one conductive sheet 4 is electrically connected to one side surface of the other conductive sheet 3 via the back side thereof. One side surface is electrically connected to the back side. Therefore, all the surfaces can be electrically grounded by grounding one place of the joining sheet 1.

  Moreover, as shown in FIG. 4, as a means for electrically connecting the sewing lines of the stacked conductive sheets 12 and 14, the sewing lines 8 are overlapped and electrically connected directly as described above. In addition to conductive metal eyelets (eyelets) 16 and other known fasteners such as hooks and pins, the needle wires 16 are inserted into the punched holes and fixed in contact with the sewing wire 8, and these stoppers are fixed. The sewing wires 8 may be electrically connected to each other through a tool.

  Further, when electrically connecting the sewing wires 8, more conductive wires 8 are connected by overlapping the conductive sheets 12 and 14 with the conductive plate 17 sandwiched between copper plates, nickel plates, and the like. Thus, conductivity can be ensured.

Then, as shown in FIG. 5, the sheet is wound around a winding drum 2 that is electrically grounded and rotatable to wind or unwind the joining sheet 1 to form an antistatic sheet shutter that opens and closes.
In the drawing, an example in which a part of the winding drum 2 is grounded is shown, but it is needless to say that an electrical connection cord for directly grounding may be provided on one side or both sides of the joining sheet 1.

In such an antistatic sheet shutter, the electrically conductive path from the joining sheet 1 to the ground (ground) passes through the conducting path of the joining portion of the joining sheet 1 and further has a conductive winding made of an aluminum alloy or the like. The sheet drum is fixed by a metal bolt 20 through a metal presser plate 13 with the sheet end folded back on the surface of the take-up drum 2, and the take-up drum 2 is a sheet shutter at the end of the rotating shaft. 7 is electrically connected to a support frame 15 made of a conductive metal such as iron (not shown) that supports the entire body 7, and the support frame 15 is fixed to the ground and grounded.
In this way, the antistatic sheet shutter 7 with improved antistatic property and high safety can be obtained by using the bonding sheet 1 having one earth.

1, 22 Bonding sheet 2 Winding drum 3, 4, 5, 6, 9, 10, 12, 14 Conductive sheet 3a, 4a, 9a, 10a Sheet base material 3b, 4b, 9b, 9c, 10b, 10c Thermoplastic Resin layer 7 Antistatic sheet shutter 8 Sewing line 8a Upper thread 8b Lower thread 11 Sewing line 13 Presser plates 15, 21 Support frame 16 Eyelet 17 Conductive plate 20 Bolt

Claims (5)

In the bonding sheet used for the antistatic sheet shutter which is wound around or wound around a rotatable winding drum and wound up or unwound by opening and closing the bonding sheet.
The conductive sheet comprises a sewing line using a conductive thread penetrating the front and back surfaces in a mesh shape on both front and back surfaces so that electric charges can be moved between the front and back surfaces. A joint sheet for an antistatic sheet shutter, characterized in that the edges of the conductive sheets are joined with being overlapped and the sewing lines of the overlapped conductive sheets are electrically connected.   The joining sheet for an antistatic sheet shutter according to claim 1, wherein the sewing line is a sewing line that is sewn by sewing or ring stitching with a sewing machine. Sewing lines, antistatic sheet joined sheets shutter according to claim 1 or 2 is a sewing line to form a network of area 500 cm ² or less in size in the mesh.   The conductive sheet is composed of a sheet base material coated with a thermoplastic resin, and the bonding sheet is formed by bonding a plurality of conductive sheets by welding the thermoplastic resin. The antistatic sheet shutter bonding sheet according to the description.   An antistatic sheet shutter that opens and closes by winding or rewinding the bonding sheet for an antistatic sheet shutter according to any one of claims 1 to 4 on a winding drum that is electrically grounded and rotatable.

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