JP2009297978A - Protective sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective sheet which is flexible at a low temperature to show very good workability, has a flame retardancy and an abrasion resistance and can prevent a loss of a protective function due to a damage of the protective sheet effectively. <P>SOLUTION: The protective sheet 1 is made by calendering a softening agent-containing flame-retardant polyethylene resin into a laminated sheet. Respective laminate parts 2, 3 and 4 are differently colored to detect a degree of abrasion. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a protective sheet, and more particularly, to protect a high- and low-voltage overhead distribution line from a temporary scaffolding on a construction site or a protruding signboard of a built structure, near a high-voltage edge support insulator or around a transformer. It is related with the protective sheet used by wrapping around the electric wire etc.

Conventionally, as this kind of protective sheet, a laminated sheet mainly composed of ethylene-vinyl acetate copolymer or a single layer sheet mainly composed of chlorinated polyethylene is used.
(See JP-A-64-43903) and the like.
The protective sheet constructed as described above is wound around places with complex shapes, such as the wires around the high-voltage edge support insulators and the wires around the transformer, and the high- and low-voltage overhead distribution lines are protected from temporary scaffoldings at the construction site. It is supposed to be
JP-A 64-43903

By the way, the above-mentioned protective sheet mainly composed of ethylene-vinyl acetate copolymer is rich in flexibility, very easy to adapt to the object to be protected, and is not widely damaged because the flexibility is not impaired even at low temperatures. It is used.
However, such a protective sheet uses a low-mass sheet material, and air is present between the laminated sheet portions, so that the structure for preventing combustion is insufficient. Furthermore, when the protective sheet is contaminated with flying objects, there is a risk that it may ignite due to a ground fault and lead to a burnout accident.

In addition, the protective sheet mainly composed of the above chlorinated polyethylene exhibits excellent properties against flame retardancy, but has a relatively high hardness at low temperatures and causes problems in terms of workability. . Furthermore, even when the object is wrapped around and secured, the shape of the wrinkles remains, which is inferior in resilience and unsuitable for reuse.

The protective sheet mainly composed of ethylene-vinyl acetate copolymer and chlorinated polyethylene is not provided with a means for detecting the degree of wear. For this reason,
When used, the roadside trees may come into contact and wear, and the protective function may be lost, causing serious problems.

The present invention is intended to solve the problems of the conventional example, and to provide a protective sheet having not only good flexibility and excellent workability even at low temperatures, but also flame resistance and wear resistance. It is. Furthermore, it is intended to provide a protective sheet that includes means for detecting the degree of wear and that can effectively prevent loss of the protective function due to wear of the protective sheet.

In order to achieve the above object, the invention according to claim 1 of the present invention is characterized in that it is calendered into a laminated sheet with a flame retardant polyethylene resin to which a softening agent is added. The gist of the protection sheet.

The invention according to claim 2 is the gist of the protective sheet according to claim 1, characterized in that each laminated sheet portion is colored differently in order to detect the degree of wear. It is.

Since the invention according to claim 1 of the present invention is configured as described above, it is rich in flexibility and resilience even at a low temperature, and has not only very good workability but also flame retardancy and wear resistance. It can be effectively used as a protective sheet and can be reused.

Since the invention according to claim 2 is configured as described above, the degree of wear during use is detected by the color change of the laminated sheet, and the loss of the protective function due to wear of the protective sheet is effectively prevented. It can be prevented.

The flame retardant polyethylene resin in the present invention is obtained by blending a polyethylene with a flame retardant, for example, an ultra-low density polyethylene, an organic halogen flame retardant, an organic phosphate flame retardant, or an inorganic type such as magnesium hydroxide. A material containing a flame retardant is preferably used. And a softening agent is added to this flame-retardant polyethylene resin, and the softness | flexibility and restoring property in low temperature are provided.

Examples of the softener include petroleum oligomers such as ethylene and α-olefin co-oligomers, paraffin softeners, aromatic softeners, naphthene softeners, and petrolatum;
Coltal softeners such as ruthenium and coumarone / indene resins; Fatty oil softeners such as fatty acids and fatty acid salts, fatty oils and waxes; Liquid polymers such as polybutene and polyisobutylene;
At least one kind of synthetic softener such as phenol aldehyde resin, styrene resin, low molecular plasticizer, or thermoplastic elastomer such as styrene copolymer or olefin polymer is used.

In the protective sheet of the present invention, a necessary softening agent is added to a flame-retardant polyethylene resin, and the sheet is calendered into a laminated sheet. There is no limitation on the apparatus and method for calendering, and the calendering is performed by a known method using a known calender molding machine. At this time, the protective sheet is preferably formed into a three-layer laminated sheet, and each laminated sheet portion is colored in a different color so that the degree of wear can be properly detected. Examples of the colorant include titanium white, zinc white, petal, vermilion, ultramarine, titanium yellow, yellow lead, carbon black, and other inorganic pigments, isoindolinone, Hansaero A, quinacridone, permanent red 4R, phthalocyanine. An organic pigment such as blue or aniline black (or a dye) is used. Further, the protective sheet is formed to have a required thickness and size as appropriate according to the application, for example, 2 mm and a size of 75 cm × 60 cm, 75 cm × 38 cm, or 38 cm × 37.5 cm.

The flame-retardant polyethylene resin in the present invention can be blended with various additives and auxiliary materials in accordance with the intended use within the range not impairing the properties of the present invention, in addition to the above-mentioned softener. And
These additives and auxiliary materials include stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, lubricants, fillers, dispersants, copper damage inhibitors, neutralizing agents, and the like. I can do it.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
1 to 3 show an embodiment of the present invention. In the figure, reference numeral 1 denotes a protective sheet which is calendered into a laminated sheet by adding a necessary softener to a flame retardant polyethylene resin. -G, 2.3
Reference numeral 4 denotes a surface layer sheet portion, an intermediate layer sheet portion, and a back layer sheet portion constituting the protective sheet 1, and the front and back layer sheet portions 2 and 4 are each colored yellow. At the same time, the intermediate layer sheet portion 3 is colored black.
In addition, 5 is an aerial distribution line, 6 is a wire protection tube, 7 is a high-pressure pin insulator, 8 is a tension insulator, and 9 is a fixing tape.

In the embodiment configured as described above, the overhead distribution line 5 having a complicated shape such as the vicinity of the high-voltage edge supporting support insulator or the periphery of the transformer is wound around in a covering state to be protected.
For example, as shown in FIG. 2, in the vicinity of the high-pressure pin insulator 7 that supports the overhead distribution line (not shown) with the wire protection tube 6, the protection sheet 1 is placed along the outer peripheral surface of the wire protection tube 6. After winding from one end to the other end and covering the head of the high-voltage pin insulator 7 together with the overhead distribution line, the fixing tape 9 is wound and fixed to securely protect the overhead distribution line. At this time, the protective sheet 1 is calendered into a laminated sheet with a flame-retardant polyethylene resin to which a softening agent is added. Not only can it be carried out very easily and reliably, it also has a restoring property, and as a result, the protective sheet 1 can be used for reuse, which is very economical. Further, the protective sheet 1 is excellent in flame retardancy and wear resistance, and not only can effectively exert the function as the protective sheet 1, but even if it is worn, the surface sheet portion 2. The intermediate sheet 3 and the back sheet 4 are colored differently so that the degree of wear can be easily detected and the protective sheet
It is possible to effectively prevent the loss of the protective function due to wear of the G1.

In addition, as shown in FIG. 3, the protective sheet 1 is provided with a tension insulator at a location where the retention clamp portion of the overhead distribution line 5 with the wire protection tube 6 is covered with a retention clamp cover (not shown). After being wound around the tension clamp cover together with a part of 8, the fixing tape 9 is wound and fixed to securely protect the overhead distribution line 5.
At this time, similar to the above-described example of use, the protective sheet 1 can be wound easily and surely, and the same effect can be obtained.

In the above embodiment, the protective sheet 1 is formed in a three-layered sheet form by the surface layer sheet portion 2, the intermediate layer sheet portion 3, and the back layer sheet portion 4. However, the number of laminated sheets may be increased or decreased as necessary. Front and back layer sheet 2
-4 is colored yellow, and the intermediate layer sheet 3 is colored black, but is not limited to this, and may be appropriately colored with different colors as necessary. It ’s good.

It is the perspective view which fractured | ruptured a part which shows one Example of this invention. It is a side view which shows the use condition of an Example. It is a side view which shows the other use condition of an Example.

Explanation of symbols

1 Protective sheet 2 Surface layer sheet 3 Intermediate layer sheet 4 Back layer sheet

Claims (2)

A protective sheet characterized by being calendered into a laminated sheet with a flame retardant polyethylene resin to which a softening agent is added. 2. The protective sheet according to claim 1, wherein each laminated sheet portion is colored in a different color so as to detect the degree of wear.

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