JP6592695B2 - Insulating sheet - Google Patents

Description

  The present invention relates to an insulating sheet formed into a sheet shape from an insulating material.

Conventionally, for example, in the case of telecommunication work performed in a live line state, an insulating sheet formed in a sheet shape by an insulating material such as polyurethane resin, which is used to prevent electric shock due to contact in a working environment, is known. Yes. By covering the insulation target object in an exposed state with this insulating sheet, it is possible to ensure an electrical insulation state in the insulation target object.
For example, Patent Document 1 relates to an electrical insulating member formed using such a polyurethane resin.

Utility model registration No. 3147883

By the way, in the case where an insulating sheet has a hole or foreign matter mixed in during production, the electrical insulation function is impaired due to energization from that part, so an electrical insulation test is performed after production, and the electrical insulation function is impaired. Those that had been removed were excluded as poor electrical insulation. For this reason, it is required not to cause holes or foreign matters to be mixed during manufacturing, but it is not easy to eliminate holes or foreign matters during manufacturing due to various factors. It was.
An object of the present invention is to provide an insulating sheet having a structure in which poor electrical insulation is unlikely to occur.

In order to achieve the above object, an insulating sheet according to the present invention is characterized in that a plurality of electrical insulating layers made of polyurethane resin are laminated to form a single sheet.
By having the above-described configuration, it is possible to provide a structure in which poor electrical insulation is unlikely to occur.
In the insulating sheet of the present invention, it is preferable that the plurality of electrical insulating layers include layers having different thicknesses. According to this configuration, a plurality of electrically insulating layers are formed including layers having different thicknesses.

In the insulating sheet of the present invention, it is preferable that the electrical insulating layer is formed of a polyurethane sheet made of the polyurethane resin. According to this configuration, a plurality of polyurethane sheets are laminated to form one sheet.
In the insulating sheet of this invention, it is preferable to provide a change visualizing function that can visually recognize a change of the polyurethane resin over time in an ultraviolet environment. According to this structure, the change with time passage of the polyurethane resin in the ultraviolet environment can be recognized visually.

  In the insulating sheet of the present invention, the change visualizing function is provided in a printing unit that is printed using a dye component that is provided on the sheet surface and causes a color change with time in an ultraviolet environment. Is preferable. According to this configuration, the change visualizing function is provided in the printing unit that is printed using the pigment component that causes the color of the sheet surface to change with time in an ultraviolet environment.

  According to the present invention, it is possible to provide an insulating sheet having a structure in which poor electrical insulation is unlikely to occur.

It is a top view of the insulating sheet which concerns on one embodiment of this invention. It is sectional drawing which shows the structure of the insulating sheet of FIG. 1 typically. It is sectional drawing which shows typically the structure of the other example of an insulating sheet.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
As shown in FIG.1 and FIG.2, the insulating sheet 10 of this embodiment is formed in one sheet by laminating a plurality of electrical insulating layers 11 made of polyurethane resin. In the present embodiment, the number of the electrically insulating layers 11 stacked is two (see FIG. 2), but is not limited thereto, and may be three or three or more.
The insulating sheet 10 according to the present embodiment is used to prevent an electric shock or the like due to contact in a work environment during, for example, a telecommunications work performed in a live state in a facility, and is an insulated object in an exposed state. By covering the surface with the insulating sheet 10, it is possible to ensure the insulation state of the object to be insulated. The working environment in which the insulating sheet 10 is used is an ultraviolet environment, and the polyurethane resin is inevitably deteriorated (embrittled) over time due to the influence of ultraviolet rays.

  The insulating sheet 10 of the present embodiment is formed into a thin plate shape having a flexible shape that can be easily folded, for example, having a rectangular shape and a thickness of 0.4 mm, and is lightly colored (as an example, pink). It has sufficient transparency. The insulating sheet 10 has a shape and a size necessary for covering the object to be insulated, and the thickness is not limited to 0.4 mm, preferably 0.1 to 1.0 mm, more preferably 0.2 to 0. .6 mm, which is not colorless and transparent, but has an arbitrary color (pink or other color) while ensuring transparency.

In the present embodiment, the plurality of electrical insulating layers 11 include layers having different thicknesses. A plurality of the electrical insulating layers 11 of the insulating sheet 10 of the present embodiment are laminated, and the laminated electrical insulating layers 11 include layers having different thicknesses even though the thicknesses are the same. Also good. When the thicknesses of the respective electric insulating layers 11 are different, all the electric insulating layers 11 may be different, or some of the electric insulating layers 11 may be different, and the electric insulating layers 11 having different thicknesses may be used. Any of these may be on the top, and an arbitrary vertically arranged structure irrespective of the thickness can be obtained.
As an example, in the case where the thickness of the insulating sheet 10 of the present embodiment is about 0.4 mm and has a two-layer structure, the electric insulating layer 11 having the same thickness of about 0.2 mm and about 0.2 mm is overlapped, and about 0 .., 1 mm and about 0.3 mm, or about 0.15 mm and about 0.25 mm, etc., and the electric insulating layer 11 having any different thickness may be stacked.

The plurality of electrical insulation layers 11 of the present embodiment are transparent with each of the electrical insulation layers 11 being lightly colored and sufficiently transparent, as well as with the lightly colored insulated electrical insulation layers 11. The insulating sheet 10 may be combined with the insulating electrical insulating layer 11 as long as the insulating sheet 10 of the present embodiment is lightly colored and has sufficient transparency.
Since the insulating sheet 10 of the present embodiment has an arbitrary color instead of being colorless and transparent, the insulating object that needs to be covered is already covered with the insulating sheet 10 and is still covered with the insulating sheet 10. It is possible to easily and clearly visually recognize that there is an insulation target that needs to be covered. In addition, since the insulating sheet 10 of the present embodiment ensures transparency, the state of the object to be insulated covered with the insulating sheet 10 can be surely passed through the insulating sheet 10 to the details even under natural light, for example. It becomes possible to grasp.

The electrical insulating layer 11 of the insulating sheet 10 of this embodiment is formed of a polyurethane sheet made of a polyurethane resin. A plurality of polyurethane sheets (in this embodiment, two as an example) are bonded together as an electrical insulating layer 11 to form a polyurethane sheet having an electrical insulating function, thereby forming a single insulating sheet 10. Has been.
In the present embodiment, as an example, the polyurethane sheet serving as the electrical insulating layer 11 is roughly flowed through a liquid polyurethane resin on a roller base (not shown), and the polyurethane resin flows to a required thickness on the roller base. It is formed by curing while adjusting the amount.

In the present embodiment, each of a plurality of polyurethane sheets to be the electrical insulating layer 11 is bonded over the entire surface with a general adhesive 12 capable of bonding the polyurethane sheet interposed therebetween, for example. Thus, the polyurethane sheets are in close contact with each other.
In the present embodiment, when a plurality of polyurethane sheets to be the electrical insulation layers 11 have different thicknesses, as shown in FIG. 2, for example, an electrical insulation layer made of a polyurethane sheet having a thickness h1 of about 0.3 mm. 11a and an electrically insulating layer 11b made of a polyurethane sheet having a thickness h2 of about 0.1 mm can be stacked and bonded together with the adhesive 12 interposed therebetween to form an insulating sheet 10 having a thickness of about 0.4 mm. .

In addition, in the layer structure by the polyurethane sheet used as the some electric insulation layer 11, the number of the polyurethane sheets bonded together is not restricted to two sheets, Three or more sheets may be sufficient, The kind of thickness of several polyurethane sheets is 1 Only one sheet, two or more sheets, all of which may be different, and can have an arbitrary vertically arranged structure regardless of the thickness of the polyurethane sheet.
The insulating sheet 10 of the present embodiment is provided with a change visualizing function capable of visually recognizing a change of polyurethane resin with time in an ultraviolet environment.
In the present embodiment, this change visualizing function is provided in the printing unit 13 provided on the sheet surface 10a of the insulating sheet 10 (see FIG. 1), and the printing unit 13 is provided with the passage of time in an ultraviolet environment. It is printed using a pigment component that causes a change in color. The sheet surface 10a of the insulating sheet 10 refers to, for example, a surface on the side where the insulating sheet 10 covering the object to be insulated is exposed to ultraviolet rays, that is, a surface that can reliably reflect the influence of ultraviolet rays.

In the printing unit 13 of the present embodiment, with time, specifically, a color that easily causes a color change (fading) with time, such as yellow or red, with time. Using (red) color, for example, the product name (insulating sheet), test conditions such as test voltage and time, use conditions such as use temperature, manufacturer name, etc. are printed (see FIG. 1). Therefore, in the printing unit 13, it is possible to visually recognize a change with time in an ultraviolet environment as a discoloration, a blur, a color loss, or the like accompanying a color change.
By providing the printing unit 13 on the sheet surface 10a of the insulating sheet 10 of the present embodiment, the period (elapsed time) in which the insulating sheet 10 of the present embodiment is exposed to ultraviolet rays is printed. Since the color change with the passage of time in the unit 13 can be dealt with, the deterioration state of the insulating sheet 10 can be estimated based on the change with the passage of time of the printing unit 13 recognized visually. .

  Specifically, visually, a change with time of the printing unit 13 of the insulating sheet 10 of the present embodiment, that is, discoloration, fading, discoloration, etc. due to fading (fading) of characters or the like of the printing unit 13 Is compared with characters or the like of the printing unit 13 that is not discolored or faded due to fading (fading), for example, the printing unit 13 of the insulating sheet 10 immediately after manufacture. As a result of comparison, when it is determined that discoloration, fading, color fading, or the like due to fading (fading) of the printing unit 13 has progressed, and the degree of discoloration, fading, fading, or the like due to fading (fading) has reached a predetermined determination criterion, It is estimated that the deterioration state of the insulating sheet 10 has reached the predetermined use period of the insulating sheet 10. Based on the estimation of the deterioration state, the used insulating sheet 10 is not exposed to ultraviolet rays, and is replaced with a new insulating sheet 10 having an original function, and the used insulating sheet 10 is stopped. .

Therefore, when the insulating sheet 10 of this embodiment is used in an environment exposed to ultraviolet rays, the deterioration state of the insulating sheet 10 can be clearly estimated based on the change of the printing unit 13 visually recognized. For this reason, the deterioration of the insulating sheet 10 progresses with time, and even if there is a possibility that the original function of the insulating sheet 10 is impaired due to, for example, being easily damaged, the use can be stopped. The insulating sheet 10 whose original function has been impaired can be prevented from being used.
In addition, a part 13a of the printing unit 13 of the insulating sheet 10 according to the present embodiment, for example, a part described in a product name (insulating sheet) (see FIG. 1) or a display unit (such as a dedicated character or symbol provided on the sheet surface 10a) ( (Not shown) is described using a color that does not easily cause a color change (fading) even with the lapse of time exposed to ultraviolet rays, such as blue (indigo) or black, and changes with time. It is good also as the object which compares the condition of.

  The insulating sheet 10 of this embodiment is provided with, for example, a checkered release paper 14 on the sheet surface 10a (see FIG. 1), and the checkered release paper 14 is easily peeled off from the insulating sheet 10. be able to. Since the release paper 14 with a mesh is attached, the insulation sheet 10 can be easily and accurately sized and shaped according to the insulation target object and the insulation target location covered with the insulation sheet 10 using the mesh as a guide. Can be cut into pieces. Note that the release paper 14 with a mesh may be attached to the sheet back surface 10b, which is the opposite side surface of the sheet surface 10a, or may not be attached to the insulating sheet 10.

Moreover, you may give an embossing to the sheet | seat back surface 10b of the insulating sheet 10 of this embodiment. By applying the wrinkle processing, a wrinkle pattern or the like is formed on the sheet back surface 10b, and the sheet back surface 10b becomes difficult to be energized. Therefore, the electrical insulation of the insulating sheet 10 can be further enhanced by using the insulating sheet 10 of the present embodiment with the sheet back surface 10b side that has been subjected to the embossing process directed toward an object to be insulated or an insulating symmetrical portion. .
The embossing may be performed not on the sheet back surface 10b but on the sheet surface 10a, or on both surfaces of the sheet back surface 10b and the sheet surface 10a. Use toward the symmetrical location.

In the insulating sheet 10 described above, the electrical insulating layer 11 is formed of a polyurethane sheet made of polyurethane resin, but a plurality of electrical insulating layers 11 made of polyurethane resin may be stacked to form an insulating sheet. Thereby, it can be set as the insulating sheet 20 in which the electrical insulating layer 11 was laminated | stacked and formed in one sheet.
As shown in FIG. 3, the insulating sheet 20 of the present embodiment is, as an example, schematically, a liquid polyurethane resin is allowed to flow on a roller base (not shown), and the polyurethane resin is made to have a required thickness on the roller base. The first electric insulating layer 11a is formed by curing while adjusting the flow amount, and then the first electric insulating layer 11a is further formed on the first electric insulating layer 11a. By forming the second electrical insulating layer 11b in the same manner as described above, the electrical insulating layer 11a and the electrical insulating layer 11b are laminated to form a single sheet.

Note that the formation of the second electrical insulating layer 11b by the same formation method as the first electrical insulating layer 11a described above is repeated after the formation of the second electrical insulating layer 11b, so that three or more layers are formed. The electrical insulating layer 11 can be formed.
That is, the insulating sheet 20 of the present embodiment is formed by repeatedly forming the electrical insulating layer 11 a plurality of times (twice in the present embodiment), thereby stacking the electrical insulating layer 11 a plurality of times (two layers in the present embodiment). Thus, a plurality of electrical insulating layers 11 are stacked in a state where the vertically adjacent layers are in direct contact with each other.

  Other configurations and operations of the insulating sheet 20 are the same as those of the insulating sheet 10, and the printing portion 13 is provided on the sheet surface 20 a of the insulating sheet 20, and the sheet back surface 20 b is subjected to embossing. The square-like release paper 14 is also the same as the insulating sheet 10 (see FIG. 3).

As described above, the insulating sheets 10 and 20 of the present embodiment are formed in one sheet by laminating a plurality of electrical insulating layers 11 made of polyurethane resin. It is possible to avoid the occurrence of defective portions as the sheets 10 and 20 as much as possible. In other words, in the production of the insulating sheets 10 and 20, it is prevented as much as possible from occurring in the normal manufacturing process, and even if it occurs, it is removed in the inspection process after manufacturing, for example, perforation (pinhole), foreign matter contamination, etc. Even if a defective portion should be present in the electrical insulating layer 11, the occurrence of a defective portion as the insulating sheets 10 and 20 can be avoided as much as possible.
This is because, if a plurality of electrical insulating layers 11 are laminated, even if a defective portion exists in one electrical insulating layer 11, all of the plurality of laminated electrical insulating layers 11 are defective. It is because it is almost impossible to become a defective part which communicates.

Therefore, it is possible to prevent the insulating sheets 10 and 20 according to the present embodiment from generating energized locations based on the defective locations existing in the electrical insulating layer 11 without limit.
In addition, in the insulating sheets 10 and 20 of the present embodiment, each time a plurality of laminated electric insulating layers 11 (that is, an electric insulating layer 11 made of polyurethane resin or a polyurethane sheet made of polyurethane resin) is formed. Since it is possible to take measures to prevent the occurrence of defective parts, it is possible to prevent the generation of hierarchical defective parts.
For this reason, the insulating sheets 10 and 20 of this embodiment can be provided with a structure in which poor electrical insulation is unlikely to occur.

In addition, the insulating sheets 10 and 20 of the present embodiment are formed by laminating the electric insulating layers 11 having different thicknesses instead of the electric insulating layers 11 having the same thickness, so that the thickness is more than about 0.2 mm. Since the 0.3 mm electric insulating layer 11 can be used, the insulating sheets 10 and 20 of about 0.4 mm can be formed using the electric insulating layer 11 having higher strength. As a result, in comparison with the case where the electrical insulation layers 11 having the same thickness are laminated, the electrical insulation layers 11 having different thicknesses are laminated in the insulation sheets 10 and 20 with, for example, holes. It is possible to make it difficult to generate a defective portion such as opening or contamination.
For this reason, the insulating sheets 10 and 20 of this embodiment can be provided with a structure in which poor electrical insulation is unlikely to occur.

  According to this invention, since it has a structure in which electrical insulation failure is unlikely to occur, a polyurethane resin or the like used to prevent electric shock due to contact in the working environment during telecommunications work performed in a live state It is optimal as an insulating sheet formed into a sheet shape from the insulating material.

DESCRIPTION OF SYMBOLS 10,20 Insulation sheet 10a, 20a Sheet surface 10b, 20b Sheet back surface 11, 11a, 11b Electrical insulation layer 12 Adhesive 13 Printing part 13a Part 14 Release paper h1, h2 Thickness

Claims (4)

A pigment component formed by laminating a plurality of electrical insulating layers made of polyurethane resin into a single sheet, and capable of visually recognizing changes in the polyurethane resin over time in an ultraviolet environment by color change. Insulating sheet characterized by including a change visualizing function (excluding changes due to hole opening or breakage) .   The insulating sheet according to claim 1, wherein the plurality of electrical insulating layers include layers having different thicknesses.   The insulating sheet according to claim 1, wherein the electrical insulating layer is formed of a polyurethane sheet made of the polyurethane resin. The change visual function, provided on the seat surface, with time under the ultraviolet environment was printed with a dye component causes a change in color, is provided on the printing unit, according to claim 1 Insulating sheet.

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