WO2012081586A1 - 赤外線透過性保護カバー、その製造方法及びこれを用いたモニタリング方法 - Google Patents
赤外線透過性保護カバー、その製造方法及びこれを用いたモニタリング方法 Download PDFInfo
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- WO2012081586A1 WO2012081586A1 PCT/JP2011/078817 JP2011078817W WO2012081586A1 WO 2012081586 A1 WO2012081586 A1 WO 2012081586A1 JP 2011078817 W JP2011078817 W JP 2011078817W WO 2012081586 A1 WO2012081586 A1 WO 2012081586A1
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- WIPO (PCT)
- Prior art keywords
- protective cover
- infrared
- resin
- sheet
- transparent protective
- Prior art date
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Images
Classifications
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C45/0055—Shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0003—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiant heat transfer of samples, e.g. emittance meter
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/04—Casings
- G01J5/048—Protective parts
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/03—Covers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
Definitions
- the present invention relates to an infrared transparent protective cover, a manufacturing method thereof, and a monitoring method using the same.
- an insulating protective cover or the like is provided on the distribution board.
- this insulating protective cover is opaque to visible light, the connection state in the protective cover cannot be seen from the outside of the protective cover. In that case, in order to confirm a connection state etc., it is necessary to remove the protective cover from a distribution board. If it does so, since a distribution board will be in the state which is not protected by the protective cover, it cannot ensure an operator's safety. From such a point of view, an insulating material that transmits visible light, such as glass, acrylic resin, and polycarbonate, is used for the protective cover.
- Patent Document 1 discloses a protective cover for an organ device in a switchboard.
- Patent Document 1 it is proposed to provide a protective cover for protecting the appliance on the front side of the appliance (built-in appliance) built in the switchboard, and the insulating cover having transparency as the material of the protective cover is proposed. It has been proposed to use a plastic sheet.
- Patent Document 2 discloses an electrical device that uses an insulating slide fastener to protect a row of operation components arranged in an electrical device, and exposes only the operation component to be operated by opening the slide fastener as necessary.
- a protective cover is disclosed. In such a protective cover, only the fastener covering the terminal part to be operated can be opened, so the state of the terminal part can be confirmed visually without removing the protective cover, and workability seems to be improved to some extent, In the state where the fastener is opened, the terminal component is exposed, which causes a problem in safety.
- monitoring methods using an infrared sensor have also been considered when equipment safety inspections in distribution boards have been conducted only by visual inspection. ing. Since it is necessary to stop energization in the visual inspection, it is necessary to stop the operation of the electric device and the electric equipment arranged downstream of the distribution board. Therefore, there is a problem that economic loss is large. In order to solve such a problem, a method capable of performing maintenance inspection and monitoring while energizing is desired. From this point of view, the monitoring method that uses an infrared sensor in particular is a simple and economical method because it is not necessary to stop the operation of the electric device or the electric equipment.
- a protective cover using the above-described glass, acrylic plate, polycarbonate plate, or the like has a large absorption in the infrared region used by the infrared sensor, and is difficult to inspect with infrared rays.
- the conventional protective cover it is difficult to perform both visual inspection and inspection with an infrared sensor with the protective cover attached.
- Patent Document 3 a filter and lens material having a property of transmitting visible light and infrared light are disclosed in Patent Document 3.
- a material such as KRS-5 (a mixture of thallium bromide and thallium iodide) also has a property of transmitting infrared rays, and is therefore widely used as a filter or lens material.
- a very special glass material mainly composed of germanium, sulfur and halogen is used as a material, and germanium, which is one of the main components, is very expensive and widely used in various industries. It is not practical to be used practically.
- germanium has the property of being easily oxidized by water vapor, and there is also a problem of reducing the infrared transmittance.
- KRS-5 has a property of transmitting a wide range of light from visible light to infrared light, but thallium is extremely toxic and has a serious problem in terms of safety.
- Other infrared transmitting materials include infrared crystals such as zinc selenide (ZnSe) and gallium arsenide (GaAs), but these are very expensive, and are used for protective covers of distribution boards. Use as a material is not realistic from an economic point of view.
- Patent Document 4 discloses a molded body in which a white additive is blended with a polyethylene resin.
- the molded article described in Patent Document 4 has a problem that it is necessary to add a white additive, and the visible light transmittance is poor. Therefore, even if the molded body described in Patent Document 4 is used as a protective cover, it is difficult to perform both visual inspection and inspection using an infrared sensor.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a practical infrared transparent protective cover that enables detection of heat generation abnormality and the like of an internal heating element by visual observation and infrared rays.
- the inventors of the present invention consisted of a resin sheet containing a resin composition, and have infrared transmission properties having a light transmission part with specific transmittance for visible light and infrared light, respectively.
- the inventors have found that the above object can be achieved by using a protective cover, and have completed the present invention.
- An infrared transmitting protective cover having a light transmitting part The light transmission part is made of a resin sheet containing a resin composition
- thermoplastic resin is a polyolefin resin.
- density of the polyolefin resin is 925 to 945 kg / m 3 .
- polyolefin resin has an intrinsic viscosity of 7 dL / g or more.
- [11] [1] to [10], comprising a molding step of obtaining the resin sheet from the resin composition by any method selected from the group consisting of an extrusion molding method, an injection molding method, a press molding method and a skive processing method.
- the manufacturing method of the infrared transparent protective cover in any one.
- [13] [1] A method for monitoring a heating element protected by the infrared transparent protective cover according to any one of [1] to [10] using visual observation and infrared thermography.
- the present invention it is possible to provide a practical infrared transmissive protective cover that enables detection of heat generation abnormality or the like of an internal heating element by visual observation or infrared rays.
- the infrared transparent protective cover (hereinafter simply referred to as “protective cover”) of the present embodiment has a light transmission part, and the light transmission part is made of a resin sheet containing a resin composition, and visible light of the light transmission part.
- the total light transmittance in the region is 70% or more, and the average infrared transmittance in the wavelength range of 8 to 14 ⁇ m is 5% or more.
- the total light transmittance in the visible light region of the light transmitting portion is a value measured according to JIS K 7361-1: 1997.
- the total light transmittance in the visible light region of the light transmission part is 70% or more, preferably 80% or more, and more preferably 85% or more.
- the protective cover is inferior in transparency with respect to visible light, and it is difficult to see an object to be detected when viewed through visible light. It becomes difficult to check the state inside the cover.
- the average infrared transmittance of the light transmitting portion means an average value of infrared transmittance in a wavelength region of 8 to 14 ⁇ m.
- the average value of the infrared transmittance is calculated by using the material constituting the light transmitting portion as a test piece, using an infrared spectrophotometer, the resolution is 4 cm ⁇ 1 , the number of integration is 32 times, and the wavelength region is 8 to 14 ⁇ m (wave number region). Then, the transmittance is measured at 1250 to 714 cm ⁇ 1 ), the value obtained from the infrared transmittance for each 1 cm ⁇ 1 obtained in the range of the wavelength region is calculated, and the averaged value is referred to as the infrared transmittance. To do. Specifically, it can be obtained by 1250 ⁇ 714cm the wavelength range of -1 to measure the infrared transmittance for each 1 cm -1, by adding all the obtained value is divided by the total number of data.
- the average infrared transmittance of the light transmitting portion in the wavelength range of 8 to 14 ⁇ m is 5% or more, preferably 10% or more, more preferably 20% or more, and further preferably 30% or more. preferable. Thereby, identification and confirmation by a sensor such as infrared thermography becomes easier.
- the haze value of the light transmission part is preferably 40% or less.
- the haze value is also referred to as haze and is an important indicator for visibility (distant visibility) when viewing a distant subject.
- the haze value is measured by the method defined in JIS K 7136: 2000.
- the haze value is preferably 40% or less, more preferably 30% or less, still more preferably 20% or less, and still more preferably 10% or less.
- the haze value includes an external haze value due to surface scattering and an internal haze value indicating the original transparency of the material.
- the haze value obtained by adding these values is the total haze value.
- the ratio (A / B) of the internal haze value (A) to the total haze value (B) of the light transmission part is preferably 0.5 or more, more preferably 0.7 or more, and 0.8 It is still more preferable that it is above.
- the internal haze is the original haze of the material due to the internal structure of the light transmission part, and the total haze is the haze including external surface scattering due to the surface smoothness.
- the distant visibility here refers to a characteristic that allows a distant view to be visually recognized.
- excellent transparency means that the visible light transmittance is high and the haze value is low.
- the thickness of the light transmitting portion is not particularly limited, but is preferably 0.2 to 3 mm from the viewpoint of the total light transmittance in the visible light region, the balance between the average infrared transmittance and the haze value, and the strength. More preferably, it is 3 to 2 mm, and further preferably 0.5 to 1.5 mm.
- the thickness of the light transmission part 3 mm or less By making the thickness of the light transmission part 3 mm or less, the visible light and infrared transmission performance and haze value described above are further improved, and the visual visibility and the detection by the infrared sensor are further improved. Can be.
- By setting the thickness of the light transmission portion to 0.2 mm or more, it is possible to impart further excellent mechanical strength to the protective cover.
- the falling weight impact strength of the light transmission part is preferably 1 J or more, more preferably 2 J or more, and further preferably 5 J or more. Because the drop weight impact strength of the light transmission part is 1J or more, even when a tool such as a screwdriver comes in contact with the protective cover during maintenance on a distribution board or switchboard where the protective cover is used, it is not destroyed. Excellent strength can be imparted to the protective cover.
- the falling weight impact strength is a value of impact energy when a striker having a striker diameter of 10 mm ⁇ and a striker weight of 3.2 kgf is applied to a test piece at a drop speed of 5.9 m / s at normal temperature. The falling weight impact strength can be measured by the method described in Examples described later.
- the resin composition used for the light transmission part contains a thermoplastic resin. Since the thermoplastic resin can be molded by various molding methods such as extrusion molding, injection molding, compression molding, blow molding, etc., it is easy to make the shape of the light transmission part a desired shape.
- polyolefin resin As the kind of thermoplastic resin, polyolefin resin is preferable.
- a resin when a resin is irradiated with infrared rays, specific absorption occurs at the wavelength of the irradiated infrared rays, and the amount of transmitted infrared rays tends to decrease depending on the type and amount of functional groups in the molecular chain constituting the resin. It is in. From this viewpoint, a polyolefin resin having a large infrared transmission amount is preferable.
- Density of the polyolefin resin is not particularly limited, the lower limit is preferably 880 kg / m 3, more preferably 910 kg / m 3. By setting the density of the polyolefin resin to 880 kg / m 3 or more, excellent rigidity can be obtained.
- the upper limit of the density of the polyolefin resin is preferably 960 kg / m 3, more preferably from 950 kg / m 3, and still more preferably from 945 kg / m 3. By setting the density of the polyolefin resin to 960 kg / m 3 or less, the proportion of the amorphous portion increases, and as a result, the haze value can be further lowered while maintaining excellent rigidity.
- the intrinsic viscosity in a 135 ° C. decalin solution of a polyolefin resin is not particularly limited.
- the intrinsic viscosity is preferably 7 dL / g or more, and more preferably 10 dL / g or more.
- the intrinsic viscosity of the polyolefin resin is preferably 7 to 20 dL / g.
- the intrinsic viscosity can be measured by a solution viscosity method.
- polyethylene resin for example, polyethylene resin, polypropylene resin, polybutadiene resin, cycloolefin resin, butene-1 resin, ethylene / propylene rubber, and hydrogenated products thereof are preferable.
- a polyethylene resin and a polypropylene resin are more preferable, and a polyethylene resin is more preferable from the viewpoint of infrared transmittance.
- the polyethylene resin has a simpler structure and has a small amount of functional groups that absorb infrared rays, and therefore has a large infrared transmission amount.
- the polyethylene resin is known as a semicrystalline resin, and usually has a crystalline part and an amorphous part.
- the comonomer used in the polyethylene copolymer is preferably propylene or 1-butene.
- the polyethylene resin here may be a homopolymer of ethylene, or ethylene and another comonomer copolymerizable with ethylene (for example, ⁇ such as propylene, 1-butene, 1-hexene, 1-octene). -Olefin, vinyl acetate, vinyl alcohol, etc.).
- Specific examples of the polyethylene resin include high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE), and ultra high molecular weight polyethylene. (UHMWPE), cross-linked polyethylene (PEX) and the like. These polyethylene resins may be used individually by 1 type, and may use 2 or more types together.
- the polyethylene resin is preferably a polyethylene resin having a narrow molecular weight distribution. More specifically, the molecular weight distribution (Mw / Mn) of the polyethylene resin obtained from gel permeation chromatography (GPC) measurement is preferably 10 or less, more preferably 8 or less, and 6 or less. More preferably it is. Examples of a method for obtaining a polyethylene resin having a narrow molecular weight distribution include a method of performing polymerization using a single site catalyst such as a metallocene catalyst.
- GPC for example, “150C ALC / GPC” manufactured by Waters is used, and “AT-807S” manufactured by Shodex and “TSK-gelGMH-H6” manufactured by Tosoh are connected in series as a column. It can be measured at 140 ° C. using trichlorobenzene containing 10 ppm of antioxidant “Irganox 1010”.
- the melt flow rate (MFR) of the polyethylene resin is preferably 20 g / 10 min or less, more preferably 10 g / 10 min or less, and further preferably 5 g / 10 min or less. preferable.
- MFR is measured at a temperature of 190 ° C. and a load of 2.16 kgf according to JIS K 7210: 1999.
- the polypropylene resin here may be a homopolymer of propylene, or other comonomer copolymerizable with propylene and propylene (for example, ⁇ , such as ethylene, 1-butene, 1-hexene, 1-octene). -Olefin, vinyl acetate, vinyl alcohol, etc.).
- polypropylene resin examples include a propylene homopolymer; a copolymer of propylene with one or more monomers selected from the group consisting of ethylene and an ⁇ -olefin having 4 to 20 carbon atoms; and a mixture thereof.
- propylene homopolymers propylene / ethylene copolymers, propylene / 1-butene copolymers, propylene / 1-pentene copolymers, propylene / 1-hexene copolymers, propylene / 1-octene copolymers.
- a polymer, a propylene / ethylene / 1-butene copolymer, and a propylene / ethylene / 1-hexene copolymer are preferable.
- the polypropylene resin is a copolymer of propylene and one or more monomers selected from the group consisting of ethylene and an ⁇ -olefin having 4 to 20 carbon atoms, it may be a random copolymer, It may be a block copolymer.
- These polypropylene resins may be used alone or in combination of two or more.
- the bonding type is not particularly limited, and may be a random copolymer or a block copolymer, for example.
- the protective cover of the present embodiment may be any cover as long as it has the above-described light transmission part, and may be a protection cover composed of only the light transmission part. From the viewpoint of strength and the like, the protective cover of the present embodiment is preferably a protective cover including the above-described light transmission part and a frame body that supports the light transmission part. By supporting the light transmission part by the frame, good strength can be imparted to the protective cover.
- FIG. 1 is a front view of one embodiment of the protective cover of the present embodiment
- FIG. 2 is a side view of the same embodiment.
- the protective cover 1 has a light transmission part 10 made of a resin sheet, and the light transmission part 10 is supported by a frame body 12 made of a base material. It is fixed by being pinched.
- the holding plate 14 is fixed to the frame body 12 with screws 16.
- the frame body 12 has an opening H and is an area corresponding to the light transmission portion 10. The object can be monitored through the opening H by visual observation and infrared thermography.
- the material of the frame 12 is not particularly limited, and examples thereof include plastics, metals such as aluminum and iron. Among these, plastic is preferable from the viewpoint of insulation.
- plastic acrylic resin, polycarbonate resin, polyethylene terephthalate resin, polyvinyl chloride resin, polyacetal resin, polyethylene resin, and polyamide resin are more preferable. Among these, an acrylic resin is preferable from the viewpoint of rigidity.
- the shape of the frame body 12 is not particularly limited, and can be suitably set to a suitable shape and size in accordance with the shape and size of a member (terminal or the like) to be protected.
- a member terminal or the like
- the thickness, width, length, etc. of the frame are preferably 4 mm or more from the viewpoint of mechanical strength.
- an acrylic resin plate (acrylic plate) is cut to form the opening H to form the frame 12 so as to cover the opening H.
- the peripheral edge can be fixed by the pressing plate 14.
- fixing members such as the light transmissive part 10 you may fix with the screw
- the protective cover 1 may be used as a protective cover for protecting the entire panel such as a distribution board in order to protect high-voltage terminals or the like, or a protective cover that protects only a portion that requires infrared monitoring. It may be used as In this case, a protective cover that can be opened and closed by sliding the light transmitting portion is preferable (not shown). By using such a slide-type protective cover, it is possible to prevent contact between the terminal and the light transmitting portion, and it is also possible to directly confirm the terminal visually.
- the protective cover 1 may have a portion other than the light transmitting portion 10 and the frame body 12 described above.
- the material of the member is preferably an insulating material from the viewpoint of preventing electric shock.
- FIG. 3 is a schematic cross-sectional side view of an example when the terminal block is protected using the protective cover of the present embodiment.
- FIG. 4 shows a side view of the state immediately before installing the protective cover on the terminal block in FIG.
- the protective cover 2 is set on the terminal block 3 by fitting both ends of the protective cover 2 into the fitting grooves 31 and 32 of the terminal block 3.
- the protective cover 2 is preferably fitted into the terminal block 3 and used as shown in FIGS.
- the protective cover of this embodiment when both ends of the protective cover 2 are fitted in the fitting grooves 31 and 32 of the terminal block 3, no whitening or cracking occurs even if stress is applied to the protective cover 2.
- the resin sheet used for the light transmission part of the protective cover 2 contains a polyolefin resin, this tendency becomes remarkable.
- the protective cover of this embodiment can be attached to various types of terminal blocks.
- FIG. 5 shows a schematic sectional side view of another example when the protective cover of the present embodiment is installed on the terminal block.
- FIG. 6 is a schematic sectional side view showing a state in which the protective cover is installed on the terminal block in FIG. After the upper side of the terminal block 5 (the right side in FIGS. 5 and 6) is covered with the protective cover 4, both ends of the protective cover 4 are bent and fixed with screws 51 and 52.
- the screws 51 and 52 may be screws. It is also possible to place the protective cover 4 on the terminal block 5 after bending the protective cover 4 in advance (see, for example, FIG. 6).
- a preferable production method includes a production method having a molding step of obtaining a resin sheet from a resin composition by any method selected from the group consisting of an extrusion molding method, an injection molding method, a press molding method, and a skive processing method. .
- Polyolefin resin such as polyethylene resin can be formed into a sheet by a commonly used forming method.
- extrusion molding performed by attaching a die provided with a slit having a desired shape to the tip of the extruder; injection molding in which a molten resin is inserted into a mold processed into a desired shape; desired shape Press molding in which resin is laid in a metal mold, and the polyolefin resin is melted and heated under a predetermined temperature and pressure, and then cooled in a pressurized state; a molded product that has been compression-molded into a cylindrical shape in advance with a cutting blade And so-called skive processing, which cuts into a desired thickness.
- a step of stretching, rolling or stretching the resin sheet at a temperature lower than the melting point after the molding step thereby, it can be set as the resin sheet which has orientation, and can be set as the protective cover which is further excellent in mechanical strength and transparency.
- Examples of the stretching method include a method in which the end is clamped and stretched uniaxially or biaxially.
- Examples of the rolling method include a method of rolling with a pair of rolls rotating in opposite directions. In particular, roll rolling is preferred when a thick resin sheet is desired. Rolling can be performed in one stage, or multistage rolling in which two or more stages are rolled. For example, when performing multi-stage rolling, the multi-stage rolling may be performed continuously, the rolled material may be taken up once, passed through the same rolling roll a plurality of times, or passed through another rolling roll. In this case, the multi-stage rolling process may be performed.
- Examples of the stretching method include a method in which a heated sheet is stretched in a biaxial direction while being pressed using a press board or the like.
- the upper limit of the stretching temperature is preferably lower than the melting point of the resin composition, more preferably the melting point is ⁇ 3 ° C., and further preferably the melting point is ⁇ 5 ° C.
- the lower limit of the stretching temperature is preferably a melting point of ⁇ 60 ° C., more preferably a melting point of ⁇ 30 ° C., still more preferably a melting point of ⁇ 10 ° C.
- the melting point is measured by differential scanning calorimetry (DSC) according to the method defined in JIS K 7121: 1987, and the peak apex is defined as the melting point. In addition, when several peaks are recognized, let the value of the peak of the lowest temperature be melting
- the stretching step may be uniaxial stretching or biaxial stretching.
- the stretch ratio of the thickness of the polyolefin resin sheet is preferably 1.3 times or more, more preferably 2 times or more, and still more preferably 3 times or more.
- the stretching ratio here refers to the ratio of the thickness before stretching to the thickness after stretching (thickness before stretching / thickness after stretching).
- a polyethylene resin is preferable, and a high-density polyethylene resin (HDPE) and an ultrahigh molecular weight polyethylene resin (UHMWPE) are more preferable.
- the stretch ratio is preferably 3 times or more, more preferably 4.5 times or more, and further preferably 5 times or more.
- the draw ratio is preferably 3.3 times or more, more preferably 3.7 times or more, and further preferably 3.9 times or more. More preferably, it is 4.8 times or more.
- any stretch ratio (rolling) Ratio) resin sheet can be obtained.
- These conditions can be selected according to the composition and thickness of the raw sheet, the desired stretch ratio (rolling ratio), and the like.
- any stretching ratio can be controlled by controlling the pressing speed, the die thickness of the press panel, the pressing pressure, and the like.
- Resin sheet can be obtained. These conditions can be selected according to the composition and thickness of the raw sheet, the desired stretch ratio (elongation ratio), and the like.
- the orientation at the time of stretching can be represented by a stretching orientation parameter f (hereinafter abbreviated as “f”) that can be determined by wide-angle X-ray scattering measurement (WAXS) represented by the following formula (2).
- f 1 ⁇ ( ⁇ / 360 °) (2)
- ⁇ half width of peak obtained by the following method
- 2 ⁇ is integrated over a range of 21.0 ° ⁇ 2 ⁇ ⁇ 22.0 °, a relationship diagram between the azimuth angle and the normalized scattering intensity is obtained, and the half-value width ( ⁇ ) of the obtained peak is determined.
- Example of WAXS measurement conditions Using a molded sheet as a test piece, “Nano Viewer” manufactured by Rigaku Corporation is used, and measurement is performed under the following conditions.
- the optical system uses point collimation (1st: 0.4 mm ⁇ , 2nd: 0.2 mm, guard: 0.6 mm ⁇ ), and X-rays are incident from the normal direction of the sheet (Through View).
- an imaging plate as a detector, the irradiation is performed for 15 minutes with a camera length of 78.8 mm, a measurement time, and a WAXS profile scattered image is obtained.
- F is preferably 0.880 or more, more preferably 0.900 or more, and further preferably 0.920 or more.
- the protective cover has excellent transparency in the visible light region, and the defect and the state of deterioration of the subject can be easily observed visually. Furthermore, it is also preferable from the viewpoint of excellent impact strength of the protective cover.
- f is the stretching temperature and stretching ratio at the time of stretching described above, and especially in the case of rolling, the roll gap width, the roll temperature, the sheet temperature before rolling of the original sheet, the temperature difference between the sheet and the roll, or the original sheet And the thickness of the sheet after rolling (rolling ratio).
- the production method of the raw sheet is also important.
- a preferable method for producing the raw sheet differs depending on the type of resin used. For example, if a high molecular weight material such as ultra high molecular weight polyethylene (UHMWPE) is prepared by extrusion molding, the surface of the sheet may be rough due to high viscosity, and transparency after stretching may be inferior. For this reason, when a high molecular weight polyethylene resin is used, a skive sheet that is cut into a thin skin shape with a cutting blade from a cylindrical molded product produced by compression molding is preferred as the original fabric sheet.
- Ultra high molecular weight polyethylene (UHMWPE) preferably has an intrinsic viscosity of 7 dL / g or more.
- High density polyethylene (HDPE) and low molecular weight polyethylene resins are high in density, and when a skive sheet is produced as a raw sheet from a compression molded body, the sheet does not scrape well due to the high rigidity of the molded body. Since the scar of a knife etc. remains and the surface becomes rough, the transparency after stretching may be lowered. From this point of view, when a raw sheet is produced using high density polyethylene (HDPE) or a polyethylene resin having a relatively low molecular weight as a raw material, an extruded sheet is preferable as the raw sheet.
- the high density polyethylene (HDPE) preferably has a density of 931 to 945 kg / m 3 .
- the resin sheet may have a total light transmittance in the visible light region of the light transmitting portion of 70% or more and an average infrared transmittance in the wavelength range of 8 to 14 ⁇ m of 5% or more.
- Any resin composition can be used as long as it can be used. Among them, for example, in the case of ultra high molecular weight polyethylene (UHMWPE) or other low crystalline low density polyethylene (LDPE), only the steps such as extrusion molding, injection molding, press molding, skive processing, etc. Even so, a resin sheet excellent in balance between total light transmittance and average infrared transmittance tends to be obtained efficiently.
- UHMWPE ultra high molecular weight polyethylene
- LDPE low crystalline low density polyethylene
- the total light transmittance and average infrared light transmission can be achieved by performing a stretching process in addition to the extrusion molding method, injection molding method, press molding method, skive processing method and the like. It tends to be able to efficiently obtain a resin sheet having a higher rate.
- the infrared transparent protective cover of the present embodiment can be manufactured from a single-layer resin sheet, but can be laminated with other sheets within a range not impairing the effects of the present embodiment, or the film can be laminated on one or both sides of the resin sheet. Or a coating material or the like may be applied to one or both sides of the resin sheet.
- the protective cover of the present embodiment can be suitably used as a protective cover in electrical equipment, for example, a protective cover for connection terminals in a distribution board, taking advantage of the above characteristics.
- the protective cover of the present embodiment has excellent transparency to both visible light and infrared light, the state of the connection terminal and the like can be monitored both visually and by infrared light. Moreover, since resin is used, sufficient insulation can be secured. As a result, the state of the connection terminal can be confirmed in a state of being energized, so there is no need to stop the equipment and devices after the distribution board, which is economically advantageous. It is possible to visually monitor the state of the connection terminal and the like, and to detect Joule heat generated from the electrical connection terminal during operation by infrared rays. Furthermore, automation is possible, and as a result, labor saving is also possible. Further, since it is not necessary to remove the protective cover, the safety of the worker can be ensured.
- the protective cover of the present embodiment can be suitably used for monitoring abnormal heat generation of a terminal block in a distribution board.
- the monitoring method using the protective cover is a method of monitoring the heating element protected by the protective cover using visual observation and infrared thermography.
- the heating element is an object (object) to be monitored, and examples thereof include electrical members such as a terminal block and a circuit breaker (breaker).
- monitoring can be performed using visual observation and infrared thermography without causing a power failure to occur in an electric member such as a terminal block or a circuit breaker (breaker) protected by a protective cover.
- the timing of visual confirmation and confirmation by infrared thermography are not particularly limited, and may be confirmed at the same time, or may be confirmed first by one of the methods and then confirmed by the other method. But you can.
- Density ( ⁇ : kg / m 3 ) The measurement was performed by a density gradient tube method (23 ° C.) according to JIS K 7112: 1999.
- the melting point was measured according to JIS K 7121: 1987. Specifically, it measured by the following operation. About 8 mg of a sample was weighed and placed in an aluminum pan and sealed. The temperature was raised from 50 ° C. to 180 ° C. at a rate of temperature increase of 10 ° C./min and maintained for 5 minutes, and then the temperature was decreased to 50 ° C. at a rate of temperature decrease of 10 ° C./min and maintained for 5 minutes. Next, the temperature was raised again to 180 ° C. at a temperature raising rate of 10 ° C./min. The temperature of the endothermic peak accompanying melting at the time of the second temperature increase was measured with a thermogravimetric measuring device (“Pyris 1 DSC”, manufactured by Perkin Elmer Co., Ltd.) to obtain a melting point.
- a thermogravimetric measuring device (“Pyris 1 DSC”, manufactured by Perkin Elmer Co., Ltd.)
- Haze A molded sheet was cut into a size of 35 mm ⁇ 50 mm to obtain a test piece, which was measured according to JIS K 7136: 2000 :.
- the measuring instrument was measured using “Haze Meter NDH2000” manufactured by Nippon Denshoku Industries Co., Ltd.
- Total light transmittance A molded sheet was cut into a size of 35 mm ⁇ 50 mm to obtain a test piece, which was measured according to JIS K 7361-1: 1997.
- the measuring instrument was measured using “Haze Meter NDH2000” manufactured by Nippon Denshoku Industries Co., Ltd.
- Drop weight impact strength A sheet-like test piece having a length of 100 mm and a width of 100 mm was prepared using an IFW tester manufactured by ROSAND. Then, at room temperature, a striker having a striker diameter of 10 mm ⁇ and a striker weight of 3.2 kgf was dropped on the test piece at a drop speed of 5.9 m / s to give an impact. The impact energy value at this time was defined as drop weight impact strength.
- a protective cover (protective cover consisting only of a light transmitting part) 7 is installed at a position 200 mm away from the dial 6 on which characters of different font sizes are written.
- a digital camera 81 was installed at a location about 600 mm away via the cover 7 to image the dial 6.
- the size of the character printed on the dial 6 is seven types of character heights 2, 3, 4, 5, 6, 7, and 8 mm (see the left area in FIG. 10).
- MS Gothic was selected as the font type using numbers (0 to 9) and alphabets (A to Z) as fonts.
- the digital camera 81 was photographed using a digital camera (model: Fine Pix S2500HD, number of effective pixels: 12.2 million pixels) manufactured by Fuji Film.
- FIG. 8 is a captured photograph showing the arrangement of the on-site inspection apparatus performed in the example.
- a circuit connecting the terminal block 9 and a no-fuse breaker (NFB: rated current 30 A) is connected to a 100 V AC power source and a 1200 W heating halogen heater as a NFB load using a 2 mm 2 vinyl wire ( The maximum allowable current 27A) was connected and the temperature difference was detected by infrared thermography.
- the energization current is 12 A (12 A because 100 V is connected to 1200 W).
- a conductive plastic sheet was sandwiched between the connection terminals of one terminal block 9 of the primary side electric wire, and the connection resistance was set to be large.
- the infrared thermography device 82, the protective cover 7, and the terminal block 9 were installed as shown in FIG. 9, and the detectability of the temperature difference in the abnormal heat generation state was judged by the thermal image.
- the distance between the terminal block 9 and the infrared thermography device 82 was 700 mm, and the distance between the terminal block 9 and the protective cover 7 was 10 mm (see FIG. 9).
- thermotracer (model: TH7102WV, temperature range: ⁇ 40 to 120 ° C.) manufactured by NEC Sanei Co., Ltd. was used. At the time of shooting, a thermal image was finally obtained after correcting the infrared transmittance of the protective cover 7 used for the measurement (transmittance correction).
- D impossible: Even when the transmittance was corrected, a temperature increase was not detected and a temperature difference could not be confirmed.
- Example 1 Asahi Kasei Chemicals Co., Ltd., ultra high molecular weight polyethylene (UHMWPE, trade name “Sunfine TM UL901”; density 920 kg / m 3 , intrinsic viscosity (IV) 16.9 dL / g, melting point 128 ° C.)
- UHMWPE ultra high molecular weight polyethylene
- IV intrinsic viscosity 16.9 dL / g, melting point 128 ° C.
- a sheet was produced. The thickness of the skive sheet was skived to 1.0 mm.
- a rolled sheet was prepared with a roll gap width (roll GAP) of 0.25 mm, a roll temperature of 120 ° C., and a roll rotation speed of 1.0 m / min, and the final sheet thickness was adjusted to 0.3 mm. That is, the ratio of the thickness before rolling to the thickness after rolling was 3.3.
- Table 1 shows the values of each physical property.
- Example 2 A sheet was produced under the same conditions as in Example 1 except that the thickness of the skive sheet was 2.5 mm, the roll GAP was 0.35 mm, and the final sheet thickness was 0.5 mm. Table 1 shows the values of each physical property.
- Example 3 A rolled sheet was produced under the same conditions as Example 1 except that the skive sheet thickness was 3.0 mm, the roll GAP was 0.50 mm, and the final sheet thickness was 0.8 mm. Table 1 shows the values of each physical property.
- Example 5 A rolled sheet was produced under the same conditions as in Example 1 except that the skive sheet thickness was 3.5 mm, the roll GAP was 0.82 mm, and the final sheet thickness was 1.2 mm. Table 1 shows the values of each physical property.
- Example 6 Asahi Kasei Chemicals Co., Ltd., ultra high molecular weight polyethylene (UHMWPE, trade name “Sunfine TM UL901”; density 920 kg / m 3 , intrinsic viscosity (IV) 16.9 dL / g, melting point 128 ° C.)
- UHMWPE ultra high molecular weight polyethylene
- IV intrinsic viscosity 16.9 dL / g
- the preheated extruded sheet is passed through a rolling mill under conditions of roll GAP of 0.85 mm, roll temperature of 120 ° C., roll rotation speed of 1.0 m / min, take-up tension of 400 N ⁇ 20 N, and thickness A 1.0 mm rolled sheet was produced.
- Table 2 shows the values of each physical property.
- Example 8 No abnormality was confirmed in the visual inspection of Example 8 by visual inspection.
- a photograph of the dial of Example 8 is shown.
- FIG. 10 is a dial used for visually confirming visibility in the present embodiment, and represents a captured photograph in a state where the right cover of the dial is covered with the protective cover of the eighth embodiment.
- no abnormality was confirmed in the field inspection by infrared thermography of Example 8.
- a thermal image photograph of an actual inspection by infrared thermography of Example 8 is shown.
- FIG. 11 shows a thermal image photograph of an actual inspection (without a protective cover) by infrared thermography in Example 8. The temperature of the measurement target in FIG. 11 was 42.9 ° C.
- FIG. 11 The temperature of the measurement target in FIG. 11 was 42.9 ° C.
- FIG. 12 shows a thermal image photograph of an actual inspection (with a protective cover) by infrared thermography in Example 8.
- the temperature of the measurement target in FIG. 12 was 32.5 ° C.
- FIG. 13 shows a thermal image photograph of an actual inspection (with a protective cover and with transmittance correction) by infrared thermography.
- the temperature of the measurement target in FIG. 13 was 43.0 ° C.
- HDPE high density polyethylene
- Example 12 A rolled sheet was produced under the same conditions as in Example 9 except that the thickness of the extruded sheet was 2.5 mm and the roll GAP was 0.25 mm. The thickness of the rolled sheet was 0.3 mm. Table 2 shows the values of each physical property.
- Example 9 except that Prime Polymer Co., Ltd., linear low density polyethylene (LLDPE, trade name “Ultzex 3520L”; density 931 kg / m 3 , MFR 2.1 g / 10 min, melting point 124 ° C.) was used as a raw material.
- An extruded sheet was produced under the same conditions as in Example 1.
- a rolled sheet was produced under the same conditions as in Example 8 except that the roll GAP was 0.35 mm, the roll temperature was 110 ° C., and the take-up tension was 240 N. The thickness of the rolled sheet was 0.6 mm. Table 3 shows the values of each physical property.
- Example 15 Tosoh Corporation ultra-low density polyethylene (VLDPE, trade name “Nipolon 08L55A”; density 884 kg / m 3 , MFR 3.6 g / 10 min) is used as a raw material, and a 0.5 mm thick mold is used as a press sheet.
- VLDPE ultra-low density polyethylene
- Nipolon 08L55A density 884 kg / m 3 , MFR 3.6 g / 10 min
- Example 16 Using a very low density polyethylene (VLDPE, trade name “Excellen VL-100”; density 900 kg / m 3 , MFR 0.8 g / 10 min) manufactured by Sumitomo Chemical Co., Ltd. as a raw material under the same conditions as in Example 15, Produced. Table 3 shows the values of each physical property.
- VLDPE very low density polyethylene
- Example 19 Using a linear low density polyethylene (LLDPE, trade name “MORETEC 0278G”; density 939 kg / m 3 , MFR 2.8 g / 10 min) manufactured by Prime Polymer Co., Ltd. Produced. Table 3 shows the values of each physical property.
- LLDPE linear low density polyethylene
- Example 20 Using a linear low density polyethylene (LLDPE, trade name “Evolue SP2520”; density 925 kg / m 3 , MFR 1.9 g / 10 min) manufactured by Prime Polymer Co., Ltd. as a raw material under the same conditions as in Example 15, Produced. Table 3 shows the values of each physical property.
- LLDPE linear low density polyethylene
- Example 21 Prime Polymer Co., Ltd., linear low density polyethylene (LLDPE, trade name “Ultzex 3520L”; density 931 kg / m 3 , MFR 2.1 g / 10 min, melting point 124 ° C.) was used as a raw material under the same conditions as in Example 15. Thus, a press sheet was produced. Table 3 shows the values of each physical property.
- LLDPE linear low density polyethylene
- Example 22 A press sheet was produced under the same conditions as in Example 15 using low density polyethylene (LDPE, trade name “Suntech LD M2713”; density 929 kg / m 3 , MFR 1.3 g / 10 min) manufactured by Asahi Kasei Chemicals Co., Ltd.). . Table 3 shows the values of each physical property.
- LDPE low density polyethylene
- Example 23 Asahi Kasei Chemicals Co., Ltd., ethylene vinyl acetate copolymer (EVA, trade name “Suntec EVA EF0510”; vinyl acetate concentration 4.8%, MFR 1.0 g / 10 min) was used as a raw material under the same conditions as in Example 15. A press sheet was produced. Table 3 shows the values of each physical property.
- EVA ethylene vinyl acetate copolymer
- Example 24 Asahi Kasei Chemicals, ethylene vinyl acetate copolymer (EVA, trade name “Suntech EVA EF0910”; vinyl acetate concentration 9.0%, MFR 1.0 g / 10 min) was used as a raw material under the same conditions as in Example 15. A press sheet was produced. Table 3 shows the values of each physical property.
- EVA ethylene vinyl acetate copolymer
- Example 25 Asahi Kasei Chemicals Co., Ltd., ethylene vinyl acetate copolymer (EVA, trade name “Suntech EVA EF1531”; vinyl acetate concentration 15.0%, MFR 3.0 g / 10 min) was used as a raw material and pressed under the same conditions as in Example 15. A sheet was produced. Table 3 shows the values of each physical property.
- EVA ethylene vinyl acetate copolymer
- Example 26 A press sheet was produced under the same conditions as in Example 15 using polypropylene (PP, trade name “NOVATEC EA9ET”; density 900 kg / m 3 , MFR 0.5 g / 10 min) manufactured by Prime Polymer Co., Ltd. Table 3 shows the values of each physical property.
- PP polypropylene
- NOVATEC EA9ET density 900 kg / m 3 , MFR 0.5 g / 10 min
- Example 8 A press sheet was produced under the same conditions as in Example 16 except that high-density polyethylene (HDPE, trade name “KM590L”, density 962 kg / m 3 , MFR 5.0 g / 10 min) manufactured by JPO was used as a raw material.
- the thickness of the press sheet was 1.1 mm. Table 4 shows the values of each physical property.
- each example has practically sufficient transmittance for both visible light and infrared light.
- the result of the on-site inspection by visual observation or infrared thermography was poor, and it was confirmed that the transmittance with respect to at least one of visible light and infrared light was poor.
- the infrared transparent protective cover of the present invention can be used as a protective cover for connection terminals in a distribution board.
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Abstract
Description
〔1〕
光透過部を有する赤外線透過性保護カバーであって、
前記光透過部は、樹脂組成物を含む樹脂シートからなり、
前記光透過部の可視光領域における全光線透過率が、70%以上であり、かつ、波長8~14μmの範囲における平均赤外線透過率が、5%以上である、赤外線透過性保護カバー。
〔2〕
前記光透過部の波長8~14μmの範囲における平均赤外線透過率が、20%以上である、〔1〕に記載の赤外線透過性保護カバー。
〔3〕
前記光透過部のヘーズ値が、40%以下である、〔1〕又は〔2〕に記載の赤外線透過性保護カバー。
〔4〕
前記光透過部の厚さが、0.2~3mmである、〔1〕~〔3〕のいずれかに記載の赤外線透過性保護カバー。
〔5〕
前記光透過部の落錘衝撃強度が、1J以上である、〔1〕~〔4〕のいずれかに記載の赤外線透過性保護カバー。
〔6〕
前記樹脂組成物が、熱可塑性樹脂を含む、〔1〕~〔5〕のいずれかに記載の赤外線透過性保護カバー。
〔7〕
前記熱可塑性樹脂が、ポリオレフィン樹脂である、〔6〕に記載の赤外線透過性保護カバー。
〔8〕
前記ポリオレフィン樹脂の密度が、925~945kg/m3である、〔7〕に記載の赤外線透過性保護カバー。
〔9〕
前記ポリオレフィン樹脂の極限粘度が、7dL/g以上である、〔7〕に記載の赤外線透過性保護カバー。
〔10〕
前記光透過部と、
前記光透過部を支持する枠体と、
を備える、〔1〕~〔9〕のいずれかに記載の赤外線透過性保護カバー。
〔11〕
押出成形法、射出成形法、プレス成形法及びスカイブ加工法からなる群より選ばれるいずれかの方法によって、前記樹脂組成物から前記樹脂シートを得る成形工程を有する、〔1〕~〔10〕のいずれかに記載の赤外線透過性保護カバーの製造方法。
〔12〕
前記成形工程の後に、前記樹脂シートを、前記樹脂組成物の融点未満の温度で延伸、圧延又は伸長する工程を、更に有する、〔11〕に記載の赤外線透過性保護カバーの製造方法。
〔13〕
〔1〕~〔10〕のいずれかに記載の赤外線透過性保護カバーにより保護された発熱体を、目視及び赤外線サーモグラフィーを用いてモニタリングする方法。
ηsp/C=(ts/tb-1)/0.1 (1)
圧延の方法としては、例えば、相互に逆方向に回転する一対以上のロールで圧延する方法が挙げられる。特に、厚肉の樹脂シートとしたい場合には、ロール圧延が好ましい。圧延は、1段で行うことも可能であるし、2段以上の圧延を行う多段圧延でもよい。例えば、多段圧延を行う場合は、連続して多段の圧延を施してもよいし、一度圧延したものを巻取り、複数回同一の圧延ロールに通過させてもよいし、別の圧延ロールに通過させて多段圧延処理してもよい。
伸長の方法としては、例えば、加熱したシートを、プレス盤等を用いて加圧しながら平面2軸方向に伸長する方法等が挙げられる。
f=1-(Δ/360°) (2)
Δ:下記方法で得られるピークの半値幅
WAXS測定によって得られる、2θ=21.2°に存在する(110)面由来のピーク強度の方位角依存性を求める。具体的には、2θが21.0°< 2θ <22.0°の範囲を積算し、方位角と規格化散乱強度の関係図を得、得られるピークの半値幅(Δ)を決定する。
成形シートを試験片として、リガク社製「Nano Viewer」を用い、以下の条件で測定する。光学系は、ポイントコリメーション(1st:0.4mmφ、2nd:0.2mm、guard:0.6mmφ)を用い、シート法線方向からX線を入射(Through View)する。検出器としてイメージングプレートを用い、カメラ長、78.8mm、測定時間、15分間照射し、WAXSプロフィール散乱像を得る。
JIS K 7112:1999に準拠し、密度勾配管法(23℃)により測定を行った。
ポリエチレン(PE)及びポリプロピレン(PP)については、JIS K 7210:1999に準拠し、測定を行った。
超高分子量ポリエチレンの粘度については、溶液粘度法によって測定を行った。20mLのデカリン(デカヒドロナフタレン)に試料20mgを入れ、150℃、2時間攪拌して試料を溶解させた。その溶液を135℃の恒温槽に入れて、ウベローデタイプの粘度計を用いて、標線間の落下時間(ts)を測定した。なお、ブランクとして、試料を入れていない、デカリンのみの落下時間(tb)を測定した。以下の式(3)に従い、試料の比粘度(ηsp/C)をプロットし、濃度0に外挿した極限粘度(η;I.V)を求めた。
ηsp/C=(ts/tb-1)/0.1 (3)
融点は、JIS K 7121:1987に準拠して測定した。具体的には、以下の操作によって測定した。試料約8mgを秤量し、アルミパンに入れて封入した。そして、50℃から180℃まで昇温速度10℃/分で昇温させ、5分間維持した後に、降温速度10℃/分で50℃まで降温させ、5分間維持した。次に、再び昇温速度10℃/分で180℃まで昇温させた。2回目の昇温時における融解に伴う吸熱ピークの温度を、熱重量測定装置(パーキンエルマー社製、「Pyris 1 DSC」)により測定し、融点とした。
(5-1)プレスシートの成形
平板開口部の寸法が、縦200mm、横200mm、厚さ(0.5mm又は1.0mm)の金型を用い、JIS K 6936-2:2007に従って、樹脂原料を圧縮成形することによりプレスシートを作製した。具体的には、以下の方法によって作製した。
厚さ5mmの平滑な鉄板に厚さ0.1mmのアルミニウム板を載せ、さらに厚さ50μmのポリエチレンテレフタレートフィルム(東レ社製、商品名「ルミラー」)を載せ、この上に前述の金型(開口部を有する金型)を載せ、その開口部に試料を入れた。この上に、ポリエチレンテレフタレートフィルム、前述のアルミニウム板、前述の鉄板の順に載せた。これを210℃に温度調節された圧縮成形機(神藤金属工業所社製、「SFA-37」)に入れ、210℃で5MPa、5分間加熱後、エアー抜きを行った後、10MPaで25分間加圧した。加圧終了後、サンプルを取り出して、25℃に温度調節された圧縮成形機(神藤金属工業所社製、「SFA-37」)に入れ、15±2℃/分の冷却速度で、10MPaの圧力下に5分間加圧しながら冷却した。冷却時には冷却水を一定量通水し、上記冷却速度になるよう調整した。
外径600mmφ、内径に90mmφの穴があいたドーナツ状の金型に、厚さが最終的に130mm程度になるように、超高分子量ポリエチレン粉末を投入し、約10MPaで30分間、内部のエアーを逃がした。その後、約9MPa、約140~145℃の条件下で、13時間加熱した。さらに、圧力を約9MPaに保ったまま、約7時間放置して、冷却を行った。次に、金型から取り出したドーナツ状の成形体を、2日間以上室温にて放置して、内部の熱を更に徐熱することで冷却を行った。この後、ドーナツ状の成形体をスカイブマシーンに固定してスカイブすることで、厚さ1~4mmのスカイブシートを得た。
上記スカイブシート又はプレスシートをロール径300mmφ、ロール幅500mmの圧延ロールにより、任意のギャップに調整し、1m/分のロール回転速さでシートの圧延を行った。ロールの温度も120℃で圧延を行った。圧延ロールから出た圧延シートは、引き取り速度を変えて引き取り、テンションコントローラーをモニターしながら200N以上の張力を掛けながら巻き取りを行った。巻き取ったシートは、常温で数時間放置し冷却することで、厚さ0.3~1.2mmの圧延シートを得た。
シートの厚さは、マイクロメーター(ミツトヨ社製、「395-541:BMD-25DM」)を用いて、小数点以下第2位まで測定し、小数点以下第2位の値を四捨五入して、求めた。なお、延伸比は、実測したシートの厚さの小数点以下第2位を四捨五入して、算出した。
成形シートを35mm×50mmに切り出して試験片とし、JIS K 7136:2000:に準じて測定した。測定機器は、日本電色工業社製、「ヘーズメーターNDH2000」を用いて測定した。
成形シートを35mm×50mmに切り出して試験片とし、JIS K 7361-1:1997に準じて測定した。測定機器は、日本電色工業社製、「ヘーズメーターNDH2000」を用いて測定した。
成形シートを35mm×50mmに切り出して試験片とし、FT-IRフーリエ変換赤外分光光度計(日本分光計社製、「FT/IR4100」)を用いて、透過法で測定した。測定条件は、分解能4cm-1、積算回数32回、波長領域8~14μmとした。1250~714cm-1の波長領域の範囲を、1cm-1毎に赤外線透過率を測定し、得られた値を全て加算して全データ数で除することにより、平均赤外線透過率とした。
ROSAND社製 IFW試験機を用い、縦100mm、横100mmのシート状の試験片を作製した。そして、常温下において、ストライカー径10mmφ、ストライカー重量3.2kgfのストライカーを、試験片の上に落下速度5.9m/sで落下させて、衝撃を与えた。このときの衝撃エネルギー値を落錘衝撃強度とした。
WAXS測定は、成形シートを35mm×50mmに切り出して試験片とし、リガク社製、「Nano Viewer」を用い、以下の条件で測定を実施した。
光学系は、ポイントコリメーション(1st:0.4mmφ、2nd:0.2mm、guard:0.6mmφ)を用い、シート法線方向からX線を入射(Through View)させた。検出器としてイメージングプレートを用い、カメラ長78.8mm、測定時間15分間でX線を照射し、WAXSプロフィール散乱像を得た。得られたWAXSプロフィール散乱像より、(110)面由来のピーク(2θ=21.2°)強度の方位角依存性を求めた。2θが21.0°< 2θ <22.0°の範囲を積算し、方位角と規格化散乱強度の関係図から得られたピークの半値幅(Δ)を決定し、下記式(4)により決定した。
f=1-(Δ/360°) (4)
分電盤内の電気結線端子から15mmの距離に保護カバーを設置し、目視による検査(目視による視認性確認)、及び赤外線サーモグラフィーによる検査(赤外線サーモグラフィーによる温度差の検知確認)を実施した。赤外線サーモグラフィーによる検査は、NEC三栄社製の赤外線サーモグラフィー装置、「TH710ZWV」を使用して行った。
異なるフォントサイズの文字が書かれた文字盤6から200mm離した位置に保護カバー(光透過部のみからなる保護カバー)7を設置し、文字盤6から保護カバー7を介して約600mm離れた場所にデジタルカメラ81を設置して、文字盤6を撮像した。文字盤6に印字した文字の大きさは、文字高さ2、3、4、5、6、7、8mmの7種類である(図10の左側領域参照)。また、文字の種類は数字(0~9)、アルファベット(A~Z)をフォントとしてMSゴシックを選定した。デジタルカメラ81は富士フィルム社製、デジタルカメラ(型式:Fine Pix S2500HD、有効画素数1220万画素)を用いて写真撮影を行った。なお、200mmの距離で文字高さ2mmの文字が視認できなかった場合は、文字盤6と保護カバー7の距離を10mmにして、同様の操作を繰り返した。
(目視による視認性の評価)
A(優):200mmの距離で文字高さ2mmの文字が容易に視認できた。
B(良):200mmの距離で文字高さ2mmの文字が何とか視認できた。
C(可):200mmの距離で文字高さ2mmの文字は視認できないが、10mmの距離では文字高さ2mmの文字が視認できた。
D(不可):10mmの距離で文字高さ2mmの文字は視認することができなかった。
図8は、実施例で行った実地検査の装置の配置を示す撮像写真である。図8に示すように、端子台9とノーヒューズブレーカー(NFB:定格電流30A)を接続した回路に、100Vの交流電源と、NFBの負荷として1200Wの暖房用ハロゲンヒーターを2mm2のビニール電線(最大許容電流27A)とを接続し、赤外線サーモグラフィーによる温度差の検知性について試験した。通電電流は12Aである(100Vを1200Wに接続しているので12Aとなる。)。意図的に片側のみを異常発熱状態に設定するために、1次側電線の一方の端子台9の接続端子に導電性プラスチックシートを挟んで接続し、接続抵抗が大きくなるように設定した。赤外線サーモグラフィー装置82、保護カバー7、端子台9を図9に示すように設置し、異常発熱状態における温度差の検知性を熱画像によって判断した。端子台9と赤外線サーモグラフィー装置82との距離を700mmとし、端子台9と保護カバー7との距離を10mmとした(図9参照)。赤外線サーモグラフィー装置82は、NEC三栄社製、サーモトレーサー(型式:TH7102WV、温度レンジ:-40~120℃)を用いた。撮影に際しては、最終的に、測定に用いた保護カバー7の赤外線透過率を補正(透過率補正)した上で、熱画像を得た。
(赤外線サーモグラフィーによる温度差検知の視認性の評価)
A(優):透過率補正をしなくても温度上昇が検知され温度差が確認できた。
B(良):透過率補正をすれば温度上昇が検知され温度差が確認できた。
C(可):透過率補正をして何とか温度上昇が検知され温度差が確認できた。
D(不可):透過率補正をしても温度上昇が検知されず温度差が確認できなかった。
旭化成ケミカルズ社製、超高分子量ポリエチレン(UHMWPE、商品名「サンファイン(商標) UL901」;密度920kg/m3、極限粘度(I.V)16.9dL/g、融点128℃)を用いてスカイブシートを作製した。スカイブシートの厚さは1.0mmにスカイブした。ロールギャップ幅(ロールGAP)を0.25mm、ロール温度を120℃、ロール回転数を1.0m/分として圧延シートを作製し、最終のシート厚さを0.3mmに調整した。すなわち、圧延後の厚さに対する圧延前の厚さの比は、3.3であった。各物性の値を表1に示す。
スカイブシートの厚さが2.5mm、ロールGAPを0.35mmとし、最終シートの厚さを0.5mmとした以外は実施例1と同じ条件でシートを作製した。各物性の値を表1に示す。
スカイブシートの厚さが3.0mm、ロールGAPを0.50mmとし、最終シートの厚さを0.8mmとした以外は実施例1と同じ条件で圧延シートを作製した。各物性の値を表1に示す。
スカイブシートの厚さが3.7mm、ロールGAPを0.55mmとし、最終シートの厚さを1.0mmとした以外は実施例1と同じ条件で圧延シートを作製した。各物性の値を表1に示す。
スカイブシートの厚さが3.5mm、ロールGAPを0.82mmとし、最終シートの厚さを1.2mmとした以外は実施例1と同じ条件で圧延シートを作製した。各物性の値を表1に示す。
旭化成ケミカルズ社製、超高分子量ポリエチレン(UHMWPE、商品名「サンファイン(商標) UL901」;密度920kg/m3、極限粘度(I.V)16.9dL/g、融点128℃)を用いてスカイブシートを作製した。スカイブシートの厚さは0.5mmであった。各物性の値を表1に示す。
旭化成ケミカルズ社製、超高分子量ポリエチレン(UHMWPE、商品名「サンファイン(商標) UL901」)を用いてスカイブシートを作製した。スカイブシートの厚さは1.0mmであった。各物性の値を表1に示す。
旭化成ケミカルズ社製、超高分子量ポリエチレン(UHMWPE、商品名「サンファイン(商標) UL901」)を原料として用い、厚さ1.0mmの金型を用いてプレスシートを作製した。プレスシートの厚さは1.0mmであった。各物性の値を表1に示す。
旭化成ケミカルズ社製、超高分子量ポリエチレン(UHMWPE、商品名「サンファイン(商標) UH950」;密度935kg/m3、極限粘度(I.V)19.6dL/g、融点145℃)を原料として用いた以外は、比較例1と同じ条件でプレスシートを作製した。プレスシートの厚さは1.0mmであった。各物性の値を表1に示す。
旭化成ケミカルズ社製、メタロセン触媒を用いて得られた高密度ポリエチレン(HDPE、商品名「クレオレックス(商標) K4125」、密度:941kg/m3、MFR:2.5g/10分、融点126℃)を、原料として用いた。そして、単軸押出機(東芝社製、スクリュー径;φ65mm、L/D=28)にて、シリンダー温度、ダイス温度及びアダプターダイ温度を、それぞれ190℃とし、スクリュー回転数を50rpmの押出条件で、ダイス幅400mm、リップ幅5.5mmのTダイを用いて溶融パリソンを押出した。次に、95℃で温調しているチルロールに溶融パリソンを導入し、GAPを5mmとし、厚さ5.0mmの押出シートを作製した。得られた押出シートを100℃の加熱槽に通過させ、通過後の押出シートの表面温度が80℃±15℃になるように維持した。なお、ロール通過直前の押出シートの表面温度を赤外センサーで測定した結果、84℃であった。この予備加熱した押出シートを、ロールGAPを0.85mm、ロール温度を120℃、ロール回転数を1.0m/分、引き取り張力を400N±20Nの条件で、圧延機に通過させて、厚さ1.0mmの圧延シートを作製した。各物性の値を表2に示す。
また、実施例8の赤外線サーモグラフィーによる実地検査でも異常は確認されなかった。ここで、一例として、実施例8の赤外線サーモグラフィーによる実地検査の熱画像写真を示す。図11は、実施例8の赤外線サーモグラフィーによる実地検査(保護カバーなし)の熱画像写真を表す。図11における測定対象の温度は42.9℃であった。図12は、実施例8の赤外線サーモグラフィーによる実地検査(保護カバーあり)の熱画像写真を表す。図12における測定対象の温度は32.5℃であった。図13は、赤外線サーモグラフィーによる実地検査(保護カバーあり・透過率補正あり)の熱画像写真を表す。図13における測定対象の温度は43.0℃であった。
これらからも明らかなように、目視及び赤外線サーモグラフィーによる実地検査はいずれも優れていた。
旭化成ケミカルズ社製、メタロセン触媒を用いて得られた高密度ポリエチレン(HDPE、商品名「クレオレックス(商標) K4125」、密度941kg/m3、MFR2.5g/10分、融点126℃)を用いて、単軸押出機(創研社製、スクリュー径;φ30mm、L/D=38)にて、シリンダー温度、ダイス温度及びアダプターダイ温度を、それぞれ190℃とし、スクリュー回転数を100rpmの押出条件で、ダイス幅300mm、リップ幅1.5mmのTダイを用いて溶融パリソンを押出した。次に、95℃で温調しているチルロールに溶融パリソンを導入し、GAPを2mmとし、厚さ2.0mmの押出シートを作製した。得られた押出シートを、常温のまま、ロールGAPを0.75mm、ロール温度を120℃、ロール回転数を1.0m/分、引き取り張力を400N±20Nの条件で圧延機に通過させて、厚さ0.9mmの圧延シートを作製した。各物性の値を表2に示す。
ロールGAPを0.50mmとした以外は実施例9と同じ条件で圧延シートを作製した。圧延シートの厚さは0.7mmであった。各物性の値を表2に示す。
ロールGAPを0.35mmとした以外は実施例9と同じ条件で圧延シートを作製した。圧延シートの厚さは0.5mmであった。各物性の値を表2に示す。
押出シートの厚さを2.5mmとし、ロールGAPを0.25mmとした以外は実施例9と同じ条件で圧延シートを作製した。圧延シートの厚さは0.3mmであった。各物性の値を表2に示す。
旭化成ケミカルズ社製、メタロセン触媒を用いて得られた高密度ポリエチレン(HDPE、商品名「クレオレックス(商標) K4125」、密度941kg/m3、MFR2.5g/10分、融点126℃)を用いた以外は、比較例1と同じ条件でプレスシートを作製した。プレスシートの厚さは1.0mmであった。各物性の値を表2に示す。
プライムポリマー社製、直鎖状低密度ポリエチレン(LLDPE、商品名「ウルトゼックス 3520L」;密度931kg/m3、MFR2.1g/10分、融点124℃)を原料として用いた以外は、実施例9と同じ条件で押出シートを作製した。次に、ロールGAPを0.35mm、ロール温度110℃、引取り張力を240Nとした以外は、実施例8と同じ条件で圧延シートを作製した。圧延シートの厚さは0.6mmであった。各物性の値を表3に示す。
押出シートは実施例13と同じ条件で作製した。圧延シートについては、圧延後のシートの引取り時の張力を390Nとした以外は、実施例9と同じ条件で圧延シートを作製した。圧延シートの厚さは0.5mmであった。各物性の値を表3に示す。
東ソー社製、超低密度ポリエチレン(VLDPE、商品名「ニポロン 08L55A」;密度884kg/m3、MFR3.6g/10分)を原料として用い、0.5mm厚さの金型を用いて、プレスシートを作製した。各物性の値を表3に示す。
住友化学社製、超低密度ポリエチレン(VLDPE、商品名「エクセレン VL-100」;密度900kg/m3、MFR0.8g/10分)を原料として用い、実施例15と同じ条件で、プレスシートを作製した。各物性の値を表3に示す。
東ソー社製、超低密度ポリエチレン(VLDPE、商品名「ニポロン 08L55A」;密度884kg/m3、MFR3.6g/10分)を原料として用い、1.0mm厚さの金型を用いてプレスシートを作製した以外は、実施例15と同じ条件で、プレスシートを作製した。各物性の値を表3に示す。
住友化学社製、超低密度ポリエチレン(VLDPE、商品名「エクセレン VL-100」;密度900kg/m3、MFR0.8g/10分)を原料として用い、1.0mm厚さの金型を用いてプレスシートを作製した以外は、実施例15と同じ条件で、プレスシートを作製した。各物性の値を表3に示す。
プライムポリマー社製、直鎖状低密度ポリエチレン(LLDPE、商品名「モアテック 0278G」;密度939kg/m3、MFR2.8g/10分)を原料として用い、実施例15と同じ条件で、プレスシートを作製した。各物性の値を表3に示す。
プライムポリマー社製、直鎖状低密度ポリエチレン(LLDPE、商品名「エボリュー SP2520」;密度925kg/m3、MFR1.9g/10分)を原料として用い、実施例15と同じ条件で、プレスシートを作製した。各物性の値を表3に示す。
プライムポリマー社製、直鎖状低密度ポリエチレン(LLDPE、商品名「ウルトゼックス 3520L」;密度931kg/m3、MFR2.1g/10分、融点124℃)を原料として用い、実施例15と同じ条件で、プレスシートを作製した。各物性の値を表3に示す。
旭化成ケミカルズ社製、低密度ポリエチレン(LDPE、商品名「サンテック LD M2713」;密度929kg/m3、MFR1.3g/10分)を原料として用い、実施例15と同じ条件で、プレスシートを作製した。各物性の値を表3に示す。
旭化成ケミカルズ社製、エチレン酢酸ビニル共重合体(EVA、商品名「サンテック EVA EF0510」;酢酸ビニル濃度4.8%、MFR1.0g/10分)を原料として用い、実施例15と同じ条件で、プレスシートを作製した。各物性の値を表3に示す。
旭化成ケミカルズ社製、エチレン酢酸ビニル共重合体(EVA、商品名「サンテック EVA EF0910」;酢酸ビニル濃度9.0%、MFR1.0g/10分)を原料として用い、実施例15と同じ条件で、プレスシートを作製した。各物性の値を表3に示す。
旭化成ケミカルズ社製、エチレン酢酸ビニル共重合体(EVA、商品名「サンテック EVA EF1531」;酢酸ビニル濃度15.0%、MFR3.0g/10分)を原料として用い、実施例15と同じ条件でプレスシートを作製した。各物性の値を表3に示す。
プライムポリマー社製、ポリプロピレン(PP、商品名「ノバテック EA9ET」;密度900kg/m3、MFR0.5g/10分)を用い、実施例15と同じ条件でプレスシートを作製した。各物性の値を表3に示す。
厚さ0.5mmのタキロン社製のポリカーボネート製シート(PC、商品名「PCSM PS600」)の諸物性を測定した。各物性の値を表4に示す。
厚さ1.0mmのタキロン社製のポリエチレンテレフタレート製シート(PET、商品名「PETEC-6010」)の諸物性を測定した。各物性の値を表4に示す。
厚さ0.6mmのポリメタクリル酸メチル製シート(PMMA、旭化成ケミカルズ社製、商品名「デラグラスA」、密度1190kg/m3、屈折率1.49、シャルピー衝撃強さ19kJ/m2、曲げ強さ120MPa)の諸物性を測定した。なお、シャルピー衝撃強さは、ISO 179/1fUに準拠したものであり、曲げ強さは、ISO 178に準拠したものである。各物性の値を表4に示す。
厚さ0.8mmのポリメタクリル酸メチル製シート(PMMA、旭化成ケミカルズ社製、商品名「デラグラスSR」、密度1180kg/m3、屈折率1.49、シャルピー衝撃強さ47kJ/m2、曲げ強さ94MPa)の諸物性を測定した。各物性の値を表4に示す。
JPO社製、高密度ポリエチレン(HDPE、商品名「KM590L」、密度962kg/m3、MFR5.0g/10分)を原料として用いた以外は、実施例16と同じ条件でプレスシートを作製した。プレスシートの厚さは1.1mmであった。各物性の値を表4に示す。
Claims (13)
- 光透過部を有する赤外線透過性保護カバーであって、
前記光透過部は、樹脂組成物を含む樹脂シートからなり、
前記光透過部の可視光領域における全光線透過率が、70%以上であり、かつ、波長8~14μmの範囲における平均赤外線透過率が、5%以上である、赤外線透過性保護カバー。 - 前記光透過部の波長8~14μmの範囲における平均赤外線透過率が、20%以上である、請求項1に記載の赤外線透過性保護カバー。
- 前記光透過部のヘーズ値が、40%以下である、請求項1又は2に記載の赤外線透過性保護カバー。
- 前記光透過部の厚さが、0.2~3mmである、請求項1~3のいずれか一項に記載の赤外線透過性保護カバー。
- 前記光透過部の落錘衝撃強度が、1J以上である、請求項1~4のいずれか一項に記載の赤外線透過性保護カバー。
- 前記樹脂組成物が、熱可塑性樹脂を含む、請求項1~5のいずれか一項に記載の赤外線透過性保護カバー。
- 前記熱可塑性樹脂が、ポリオレフィン樹脂である、請求項6に記載の赤外線透過性保護カバー。
- 前記ポリオレフィン樹脂の密度が、925~945kg/m3である、請求項7に記載の赤外線透過性保護カバー。
- 前記ポリオレフィン樹脂の極限粘度が、7dL/g以上である、請求項7に記載の赤外線透過性保護カバー。
- 前記光透過部と、
前記光透過部を支持する枠体と、
を備える、請求項1~9のいずれか一項に記載の赤外線透過性保護カバー。 - 押出成形法、射出成形法、プレス成形法及びスカイブ加工法からなる群より選ばれるいずれかの方法によって、前記樹脂組成物から前記樹脂シートを得る成形工程を有する、請求項1~10のいずれか一項に記載の赤外線透過性保護カバーの製造方法。
- 前記成形工程の後に、前記樹脂シートを、前記樹脂組成物の融点未満の温度で、延伸、圧延又は伸長する工程を、更に有する、請求項11に記載の赤外線透過性保護カバーの製造方法。
- 請求項1~10のいずれか一項に記載の赤外線透過性保護カバーにより保護された発熱体を、目視及び赤外線サーモグラフィーを用いてモニタリングする方法。
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- 2011-12-13 US US13/993,824 patent/US20130329765A1/en not_active Abandoned
- 2011-12-13 EP EP11848150.6A patent/EP2654148B1/en active Active
- 2011-12-13 WO PCT/JP2011/078817 patent/WO2012081586A1/ja active Application Filing
- 2011-12-13 JP JP2012548795A patent/JP5622866B2/ja active Active
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JP2012126769A (ja) * | 2010-12-13 | 2012-07-05 | Japan Atom Power Co Ltd:The | 可視光線・赤外線透過シート |
JP2013019821A (ja) * | 2011-07-13 | 2013-01-31 | Tokyo Electric Power Co Inc:The | 電気機器監視システム及び電気機器監視方法 |
CN105990805A (zh) * | 2015-01-30 | 2016-10-05 | 上海华林工业气体有限公司 | 一种用于制氢装置的带电监测的封闭式电气开关柜 |
JP2016189638A (ja) * | 2015-03-30 | 2016-11-04 | テンパール工業株式会社 | 分電盤 |
JP2021132511A (ja) * | 2020-02-21 | 2021-09-09 | 東芝プラントシステム株式会社 | 保護カバー、電気設備及び検査方法 |
Also Published As
Publication number | Publication date |
---|---|
CN103563192B (zh) | 2017-08-29 |
EP2654148B1 (en) | 2019-08-07 |
CN103563192A (zh) | 2014-02-05 |
EP2654148A1 (en) | 2013-10-23 |
US20130329765A1 (en) | 2013-12-12 |
US20170068026A1 (en) | 2017-03-09 |
EP2654148A4 (en) | 2018-03-14 |
JP5622866B2 (ja) | 2014-11-12 |
JPWO2012081586A1 (ja) | 2014-05-22 |
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