WO2016143600A1 - 電子部品包装用カバーテープおよび電子部品用包装体 - Google Patents
電子部品包装用カバーテープおよび電子部品用包装体 Download PDFInfo
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- WO2016143600A1 WO2016143600A1 PCT/JP2016/056200 JP2016056200W WO2016143600A1 WO 2016143600 A1 WO2016143600 A1 WO 2016143600A1 JP 2016056200 W JP2016056200 W JP 2016056200W WO 2016143600 A1 WO2016143600 A1 WO 2016143600A1
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- Prior art keywords
- cover tape
- packaging
- electronic component
- antistatic layer
- layer
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D73/00—Packages comprising articles attached to cards, sheets or webs
- B65D73/02—Articles, e.g. small electrical components, attached to webs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2585/00—Containers, packaging elements or packages specially adapted for particular articles or materials
- B65D2585/68—Containers, packaging elements or packages specially adapted for particular articles or materials for machines, engines, or vehicles in assembled or dismantled form
- B65D2585/86—Containers, packaging elements or packages specially adapted for particular articles or materials for machines, engines, or vehicles in assembled or dismantled form for electrical components
Definitions
- the present invention relates to an electronic component packaging cover tape and an electronic component packaging body.
- Patent Document 1 discloses that a sealant layer is provided on a base material layer in order to suppress charge generated during peeling from a carrier tape, and the sealant layer includes a polyolefin resin and a polyether / polyolefin copolymer.
- a cover tape including is disclosed.
- Patent Document 2 discloses a cover tape in which the surface resistance value of the surface of the sealant layer is controlled so as to satisfy a specific condition in order to suppress charging caused by friction between the cover tape and the electronic component.
- the present invention provides a cover tape for packaging electronic parts having excellent frictional antistatic properties.
- the present inventor has obtained a base material layer, a sealant layer provided on one surface side of the base material layer, and a charge provided on the other surface of the base material layer. And a surface resistance value on the surface of the antistatic layer measured at 23 ° C. and 50% RH and a surface on the surface of the antistatic layer measured at 23 ° C. and 30% RH The present invention has been completed by obtaining the knowledge that the scale of the resistance value is effective as a design guideline for improving the antistatic properties accompanying peeling of the carrier tape.
- a base material layer A sealant layer provided on one surface side of the base material layer; An antistatic layer provided on a surface opposite to the one surface of the base material layer; A cover tape for packaging electronic parts having The surface resistance value at the surface of the antistatic layer measured at 23 ° C. and 50% RH is defined as R 50, and the value of the surface resistance value at the surface of the antistatic layer measured at 23 ° C. and 30% RH is defined as R 30. Then, a cover tape for packaging electronic parts, in which the value of R 50 / R 30 is 0.35 or more and 2.8 or less, is provided.
- the inventor has conducted extensive research to achieve the above-described problems, and as a result, the base material layer, the sealant layer provided on one surface side of the base material layer, and the other base material layer.
- the cover tape for packaging electronic parts having the antistatic layer provided on the surface of the antistatic layer, the time when the absolute value of the frictional band voltage on the surface of the antistatic layer measured under different humidity conditions decays from 5 kV to 50 V (voltage decay)
- the present invention was completed by obtaining the knowledge that the measure of the rate of change in time) is effective as a design guideline for improving the antistatic properties accompanying peeling of the carrier tape.
- a base material layer A sealant layer provided on one surface side of the base material layer; An antistatic layer provided on a surface opposite to the one surface of the base material layer; A cover tape for packaging electronic parts having With respect to the charging voltage decay time until the absolute value of the frictional charging voltage on the surface of the antistatic layer decays from 5 kV to 50 V, the value of the charging voltage decay time measured at 23 ° C. and 50% RH is S 50.
- a cover tape for packaging electronic parts in which the value of S 50 / S 30 is 0.7 or more and 1 or less, where S 30 is the value of the voltage decay time measured at 0 ° C. and 30% RH.
- a component storage tape comprising a component tape for storing electronic components arranged side by side at a predetermined interval and a cover tape provided so as to cover the component storage portion formed on the carrier tape.
- the component storage tape can be wound in a reel shape
- the cover tape is an electronic component packaging body that is the electronic component packaging cover tape.
- FIG. 1 is a schematic cross-sectional view showing an example of a cover tape for packaging electronic components according to the present embodiment.
- an electronic component packaging cover tape 10 (hereinafter also referred to as “cover tape”) according to the present embodiment is provided on the base layer 1 and one surface side of the base layer 1.
- the sealant layer 2 and the antistatic layer 3 provided on the surface of the base material layer 1 opposite to the one surface are provided.
- the cover tape 10 has a surface resistance value measured on the surface of the antistatic layer 3 measured at 23 ° C. and 50% RH as R 50 and is measured on the surface of the antistatic layer 3 measured at 23 ° C. and 30% RH.
- the surface resistance value is R 30
- the value of R 50 / R 30 is 0.35 or more and 2.8 or less.
- the cover tape excellent in the antistatic property accompanying peeling of a carrier tape is realizable.
- the said surface resistance value can be measured according to IEC61340.
- FIG. 2 is a diagram illustrating an example of a state in which the electronic component packaging cover tape according to the present embodiment is sealed with a carrier tape.
- the cover tape 10 is used as a cover material for a carrier tape 20 in which concave pockets 21 are continuously provided in accordance with the shape of the electronic component.
- the cover tape 10 is used by adhering (for example, heat sealing) to the surface of the carrier tape 20 so as to cover the entire opening of the pocket 21 of the carrier tape 20.
- a structure obtained by bonding the cover tape 10 and the carrier tape 20 will be referred to as a package 100 for an electronic component.
- the package 100 for electronic parts is produced by the following procedure. First, an electronic component is accommodated in the pocket 21 of the carrier tape 20. Next, the cover tape 10 is adhered to the surface of the carrier tape 20 so as to cover the entire opening of the pocket 21 of the carrier tape 20, thereby obtaining a structure in which the electronic component is hermetically housed in the package 100. Can do. A structure containing such electronic components is conveyed to a work area where surface mounting is performed on an electronic circuit board or the like in a state where the package 100 is wound around a paper or plastic reel. As described above, when the electronic component is conveyed with the package 100 wound around the reel, the bottom surface 20 a of the carrier tape 20 is in contact (friction) with the surface 10 a of the cover tape 10.
- the electronic component packaging body includes a carrier tape 20 in which component storage portions (pockets 21) for storing electronic components are arranged at predetermined intervals, and a component storage portion formed on the carrier tape 20. It is comprised with the component storage tape which consists of the cover tape 10 provided so that it might cover. This component storage tape can be wound into a reel.
- the electronic component packaging cover tape (cover tape 10) of the present embodiment may have a sheet shape or a roll shape that can be wound into a reel.
- the present inventor has obtained the following knowledge. Specifically, when transporting a structure containing electronic components produced using a conventional cover tape, the surface where the carrier tape and the cover tape are bonded by vibration during transport, that is, the cover tape Static electricity is generated by friction on the surface opposite to the surface of the sealant layer.
- the static electricity generated by friction during transportation may cause the electronic components contained in the package to break down or cause problems such as sticking when mounted on the board.
- the present inventor has found that the conventional cover tape has room for improvement in terms of countermeasures against static electricity on the surface opposite to the surface of the sealant layer. For example, a method of reducing the surface resistance value can be considered as a normal antistatic measure. However, even if the surface resistance value is lowered, triboelectric charging may occur. As a result of studies based on such knowledge, it has been considered that the generation of frictional charging can be suppressed by suppressing the charging in consideration of the working environment.
- the cover tape according to the present embodiment has the surface resistance value R 50 on the surface of the antistatic layer measured at 23 ° C. and 50% RH and the antistatic layer measured at 23 ° C. and 30% RH as described above.
- the ratio of the surface resistance value R 30 on the surface, the value of R 50 / R 30 satisfies a specific condition.
- the electronic component may be electrostatically damaged due to the vibration that occurs when the electronic component is transported and the bottom surface of the carrier tape and the surface of the cover tape come into contact with each other, or troubles such as sticking when mounting the substrate. It is possible to suppress the occurrence of inconvenience.
- the lower limit value of R 50 / R 30 is, for example, preferably 0.35 or more, more preferably 0.4 or more, and further preferably 0.5 or more.
- the upper limit value of R 50 / R 30 is, for example, preferably 2.8 or less, more preferably 2.5 or less, further preferably 2 or less, and still more preferably 1.5 or less. is there.
- the cover tape according to the present embodiment has a surface resistance value R 50 on the surface of the antistatic layer measured at 23 ° C. and 50% RH, and a surface resistance on the surface of the antistatic layer measured at 23 ° C. and 12% RH.
- the ratio between the value R 12, the value of R 50 / R 12 is, preferably, 0.1 to 10, still more preferably 0.125 to 8, and most preferably, 0.17 or more 6 It is as follows. This makes it possible to more strictly control the change in the surface resistance value of the antistatic layer on the cover tape as humidity changes in the work environment at the manufacturing site of electronic equipment.
- the cover tape can be further improved depending on the property.
- the cover tape 10 has a time when the absolute value of the frictional voltage on the surface of the antistatic layer 3 decays from 5 kV to 50 V, that is, the voltage decay time is 23 ° C.
- the voltage decay time is 23 ° C.
- S 50 is a value measured at 50% RH
- S 30 is a value measured at 23 ° C. and 30% RH
- the value of S 50 / S 30 is 0.7 or more and 1 or less.
- the inventor of the present application can generate triboelectric charge by moving the charge derived from static electricity generated by friction through moisture adhering to the surface of the antistatic layer in the conventional cover tape. Based on the knowledge that it has high characteristics, we focused on the characteristics including humidity change as a factor, and found new design guidelines.
- the cover tape according to the present embodiment is calculated from the charged voltage decay time S 50 measured at 23 ° C. and 50% RH and the charged voltage decay time S 30 measured at 23 ° C. and 30% RH as described above.
- the value of S 50 / S 30 to be satisfied satisfies a specific condition.
- the electronic component is electrostatically damaged due to the vibration generated when the electronic component is transported and the bottom surface of the carrier tape and the surface of the cover tape are in contact with each other, or troubles such as sticking when mounted on the board. It is possible to suppress the occurrence of inconvenience.
- the lower limit value of the above S 50 / S 30 is, for example, 0.7 or more, preferably 0.8 or more, and more preferably 0.9 or more.
- the upper limit value of S 50 / S 30 is not particularly limited, but may be 1 or less, for example.
- the frictional voltage on the surface of the antistatic layer which is carried out to measure the charged voltage decay time S, can be measured, for example, by the following method.
- the frictional voltage according to the present embodiment a result obtained by directly measuring the frictional voltage on the surface of the antistatic layer with a known surface potential meter may be employed, or the frictional voltage on the surface of the object may be used. You may employ
- the value of the charging voltage decay time measured at 23 ° C. and 50% RH is S 50
- the value of the charging voltage decay time measured at 23 ° C. and 12% RH is S 12
- the value of S 50 / S 12 is preferably 0.2 or more and 1 or less, more preferably 0.4 or more and 1 or less, and most preferably 0.5 or more and 1 or less. In this way, it is possible to more strictly control the fluctuation of the triboelectric charge amount of the antistatic layer in the cover tape as the humidity of the work environment at the manufacturing site of the electronic equipment changes.
- the cover tape can be further improved depending on the property.
- the lower limit of the total light transmittance of the cover tape according to the present embodiment is preferably 80% or more, and more preferably 85% or more. In this way, in the package composed of the cover tape and the carrier tape, the necessary transparency is given to the extent that it is possible to inspect whether or not the electronic component is correctly accommodated in the pocket of the carrier tape. Can do. In other words, by making the total light transmittance of the base material layer equal to or higher than the above lower limit value, the electronic component housed in the package body composed of the cover tape and the carrier tape is visually confirmed from the outside of the package body. It becomes possible to do.
- the upper limit of the total light transmittance of the cover tape is not particularly limited, but can be, for example, 100% or less. The total light transmittance of the cover tape can be measured according to JIS K7105 (1981).
- a sheet made of a material made of polystyrene is superposed on the surface of the antistatic layer of the cover tape, and the sheet is rubbed twice at a speed of 100 mm / s at an interval of 50 mm. After 5 seconds, the frictional voltage is measured at 23 ° C. and 50% RH.
- the friction withstand voltage of such a cover tape is not particularly limited, but is preferably, for example, preferably -1800 V or more and 1800 V or less, more preferably -1500 V or more and 1500 V or less, and further preferably -1000 V or more and 1000 V or less, More preferably, it is ⁇ 800V or more and 800V or less.
- the static electricity generated by the contact between the bottom surface of the carrier tape and the surface of the cover tape due to vibration during transportation of the electronic component is stored in the package made of the carrier tape and the cover tape. It is possible to further reduce the influence on the.
- the surface of the antistatic layer in the cover tape and the surface of the object to be brought into contact with the surface of the antistatic layer in the cover tape such as a carrier tape are neutralized.
- the surface of the antistatic layer in the cover tape is brought into contact with the surface of the object twice in one direction, and the frictional voltage is measured using a known surface potential meter.
- the frictional voltage according to the present embodiment a result obtained by directly measuring the frictional voltage on the surface of the antistatic layer with a known surface potential meter may be employed, or the frictional voltage on the surface of the object may be used. You may employ
- the width of the cover tape according to the present embodiment is not particularly limited, but may be, for example, 2 mm or more and 100 mm or less, preferably 2 mm or more and 80 mm or less, and more preferably 2 mm or more and 50 mm or less.
- the material constituting the base material layer can be used when making a cover tape by laminating an antistatic layer or sealant layer on the base material layer, when bonding the cover tape to the carrier tape, or when using the cover tape. As long as it has sufficient mechanical strength to withstand the stress applied from the outside, etc., and heat resistance to withstand the heat history applied when the cover tape is bonded to the carrier tape Good.
- the form of the material which comprises a base material layer is although it does not specifically limit, From a viewpoint with which a process is easy, a film form may be sufficient.
- the material constituting the base material layer include, for example, polyester resins, polyamide resins, polyolefin resins, polyacrylate resins, polymethacrylate resins, polyimide resins, polycarbonate resins, ABS resins, and the like. Can be mentioned. Among these, from the viewpoint of improving the mechanical strength of the cover tape, a polyester resin is preferable, and polyethylene terephthalate is more preferable. Further, from the viewpoint of improving the mechanical strength and flexibility of the cover tape, nylon 6 may be used as a material constituting the base material layer. In addition, you may contain a lubricant in the material which comprises a base material layer. These may be used alone or in combination of two or more.
- the base material layer may be formed of a single layer film including the above-described material, or may be formed using a multilayer film including the above-described material in each layer. Moreover, as a form of the film used for forming the base material layer, an unstretched film or a film stretched in a uniaxial direction or a biaxial direction may be used. From the viewpoint of improving the strength, a film stretched in a uniaxial direction or a biaxial direction may be used.
- the thickness of the base material layer may be, for example, 9 ⁇ m or more and 25 ⁇ m or less, and preferably 9 ⁇ m or more and 16 ⁇ m or less.
- the cover tape is not too high in rigidity, and even if a torsional stress is applied to the carrier tape after sealing, the cover tape is Following the deformation, it is possible to suppress peeling.
- the thickness of the base material layer is equal to or higher than the above upper limit value, the mechanical strength of the cover tape can be improved, so even when the cover tape is peeled off from the carrier tape at a high speed, It can suppress that a cover tape breaks.
- the lower limit of the total light transmittance of the base material layer is, for example, preferably 80% or more, and preferably 85% or more. In this way, in the package composed of the cover tape and the carrier tape, the necessary transparency is given to the extent that it is possible to inspect whether or not the electronic component is correctly accommodated in the pocket of the carrier tape. Can do. In other words, by making the total light transmittance of the base material layer equal to or higher than the above lower limit value, the electronic component housed in the package body composed of the cover tape and the carrier tape is visually confirmed from the outside of the package body. It becomes possible to do.
- the upper limit of the total light transmittance of a base material layer is not specifically limited, For example, it can be 100% or less. The total light transmittance of the base material layer can be measured according to JIS K7105 (1981).
- the sealant layer is a layer provided on the surface of the base material layer opposite to the surface on which the antistatic layer is provided. The surface of the sealant layer comes into contact with the carrier tape when the cover tape is used by the method described above.
- the multi-layer structure including an antistatic layer, a base material layer, and a sealant layer provides a balance between adhesion and peelability to a carrier tape, and an electronic component packaging cover tape having excellent antistatic properties. Can be realized.
- a material constituting the sealant layer for example, a material containing a thermoplastic resin such as an acrylic resin or a polyester resin and an antistatic agent can be used.
- antistatic agents include metal fillers such as tin oxide, zinc oxide, titanium oxide, and smectite, surfactants having a structure such as polyoxyethylene alkylamine, quaternary ammonium, and alkyl sulfonate, polyoxyethylene Polymer type antistatic agent, ionic liquid, polypyrrole, poly (3,4-ethylenedioxythiophene polyacetylene, polyaniline, etc.
- incorporating block structures or random structures such as alkylamine, quaternary ammonium, alkylsulfonate, and polyether
- examples thereof include conductive polymers composed of these derivatives, one kind selected from the group consisting of carbon, or a mixture thereof, and examples of the carbon include various carbons such as carbon black, white carbon, carbon fiber, and carbon tube.
- a filler having the following shape may be used, and these may be used alone or in combination of two or more.
- the material constituting the sealant layer includes oxide particles mainly composed of silicon, magnesium or calcium, inorganic particles such as silica and talc, polyethylene particles, polyacrylate particles, and polystyrene from the viewpoint of preventing blocking that occurs during transportation. 1 type selected from the group which consists of organic particles, such as particles, or these alloys may be contained.
- the thickness of the sealant layer may be, for example, 1 ⁇ m or more and 15 ⁇ m or less, preferably 1 ⁇ m or more and 10 ⁇ m or less, more preferably 1 ⁇ m or more and 5 ⁇ m, from the viewpoint of improving the balance between adhesion to the carrier tape and peelability. It is good also as follows.
- the surface resistance value of the sealant layer may be set to, for example, 10 4 ⁇ or more and 10 11 ⁇ or less under the conditions of 23 ° C. and 50 RH% from the viewpoint of efficiently discharging static electricity generated by various factors to the outside. It may be from 10 5 ⁇ to 10 10 ⁇ , and more preferably from 10 5 ⁇ to 10 9 ⁇ .
- the surface resistance value can be measured according to IEC61340.
- the antistatic layer is a layer provided on the surface of the base material layer opposite to the surface on which the sealant layer is provided. As described above, the surface of the antistatic layer has a possibility of coming into contact with the bottom surface of the carrier tape when the electronic component is accommodated and transported in a package made of the carrier tape and the cover tape.
- the material forming the antistatic layer is, for example, a charged column compared to a material forming an object that contacts the surface of the antistatic layer when an electronic component such as a material forming the bottom surface of the carrier tape is accommodated and transported. It is preferable to include a “positive compound” located on the positive side in FIG. 5 and a “negative compound” located on the negative side in the charged column as compared with the material forming the object. By doing so, it is possible to suppress the generation of static electricity due to friction when the surface of the antistatic layer comes into contact with the object.
- the positive compound contained in the material forming the antistatic layer is charged positively, while the negative compound is negatively charged Therefore, it is considered that it can be electrically neutralized in the antistatic layer.
- Examples of the method for measuring the positive and negative charge amounts include a method in which the surface of a resin sheet or the surface of a film coated on the sheet is rubbed with a cotton cloth (cotton 100%) and then measured with a surface potential meter.
- a surface electrometer such as 3M Static Sensor 718 can be used.
- the positive compound of the present embodiment may be a compound that is positively charged with respect to the cotton cloth.
- an aziridinyl compound and its ring-opening compound may be used as a positive compound.
- the aziridinyl compound generally refers to a compound having an aziridinyl group, and specific examples thereof include N, N′-hexamethylene-1,6-bis (1-aziridycarboxamide), N, N′-diphenylmethane.
- the ring-opening compound of an aziridinyl compound refers to the compound in the state which the aziridinyl group in an aziridinyl compound was ring-opened.
- the content of the positive compound described above is preferably 0.2% by weight or more and 98% by weight or less, and preferably 0.5% by weight or more and 90% by weight or less with respect to the total amount of the material forming the antistatic layer. And more preferred. By doing so, the physical strength of the coating film is increased and the antistatic agent slips off due to contact.
- the negative compound of the present embodiment may be a compound that is negatively charged with respect to the cotton cloth, and examples thereof include a negative binder resin such as a fluororesin and a polyester compound. These may be used alone or in combination of two or more.
- an ester compound refers to a compound formed by combining an organic acid or inorganic acid and an alcohol by a dehydration reaction. Specific examples thereof include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and derivatives thereof. Is mentioned.
- the content of the negative compound described above is preferably 0.2% by weight or more and 98% by weight or less, and preferably 0.5% by weight or more and 90% by weight or less with respect to the total amount of the material forming the antistatic layer. And more preferred. By doing so, the physical strength of the coating film is increased and the antistatic agent slips off due to contact.
- the antistatic property of the antistatic layer can be improved by using the positive compound and the negative compound in combination. Furthermore, the antistatic layer in which the positive compound and the negative compound are sufficiently dispersed can appropriately control the characteristics including the surface resistance value and the humidity change such as the charging voltage decay time as a factor. It has been found that prevention can be realized. Although the detailed mechanism is not clear, since the triboelectric charge generated by friction can be neutralized by the positive compound and the negative compound, it is considered that the characteristics including humidity change can be appropriately controlled.
- the blending amount of the positive compound and the negative compound is determined based on the solid content, thereby facilitating the control of the frictional antistatic property by the combined use thereof.
- the lower limit value of the solid content of the negative compound is, for example, 50% by weight or more with respect to the total value of 100% by weight of the solid content of the positive compound and the solid content of the negative compound.
- 60% by weight or more is preferable, and 70% by weight or more is more preferable.
- the upper limit value of the solid content of the negative compound is not particularly limited.
- the upper limit value is 99% by weight or less with respect to 100% by weight of the total solid content of the positive compound and the solid content of the negative compound. Alternatively, it may be 95% by weight or less, or 90% by weight or less.
- the upper limit of the surface resistance value of the antistatic layer is, for example, preferably 10 11 ⁇ or less, more preferably 10 10 ⁇ or less, further preferably 10 9 ⁇ or less, and 10 7 ⁇ or less, under the conditions of 23 ° C. and 15 RH%. Is more preferable. Thereby, antistatic property can be improved.
- the lower limit of the surface resistance value of the antistatic layer is not particularly limited under the conditions of 23 ° C. and 15 RH%, but may be, for example, 10 3 ⁇ or more, and preferably 10 4 ⁇ or more.
- the surface resistance value can be measured according to IEC61340.
- the material for forming the antistatic layer preferably contains a conductive polymer from the viewpoint of reducing the surface resistance value of the antistatic layer and suppressing the generation of static electricity due to friction.
- a conductive polymer include polyaniline, polypyrrole and the like, and among them, a polyethylenedioxythiophene / polystyrene sulfonic acid (PEDOT / PSS) based compound can be suitably used. These may be used alone or in combination of two or more.
- the material for forming the antistatic layer preferably contains a surfactant from the viewpoint of improving the wettability and leveling properties when forming the antistatic layer.
- a surfactant may be a low molecular surfactant or a high molecular surfactant, but a surfactant having a fluorine alkyl structure can be suitably used. These may be used alone or in combination of two or more.
- the frictional voltage of the antistatic layer is, for example, preferably from ⁇ 1800 V to 1800 V, more preferably from ⁇ 1500 V to 1500 V, and even more preferably from ⁇ 1000 V to 1000 V under the conditions of 23 ° C. and 50% RH. Or less, more preferably from ⁇ 800 V to 800 V, and most preferably from ⁇ 500 V to 500 V.
- the absolute value of the frictional voltage of the antistatic layer is, for example, preferably 1800 V or less, more preferably 1500 V or less, and further preferably 1000 V or less under the conditions of 23 ° C. and 50% RH. More preferably, it is 800 V or less, and most preferably 500 V or less.
- the electronic component may be electrostatically damaged due to the vibration that occurs when the electronic component is transported and the bottom surface of the carrier tape and the surface of the cover tape come into contact with each other, or trouble occurs when mounting the board. It is possible to suppress the occurrence of inconvenience.
- the lower limit value of the film thickness of the antistatic layer of the present embodiment is not particularly limited, but may be, for example, 1 nm or more, preferably 10 nm or more, and more preferably 20 nm or more. Thereby, the mechanical strength of the antistatic layer can be improved.
- the upper limit value of the film thickness of the antistatic layer is not particularly limited, but may be, for example, 5 ⁇ m or less, preferably 4 ⁇ m or less, and more preferably 3 ⁇ m or less. Thereby, the softness
- the cover tape which concerns on this embodiment may provide an intermediate
- Examples of the material for forming the intermediate layer described above include olefin resins, styrene resins, and cyclic olefin resins.
- an olefin resin may be used from the viewpoint of improving the adhesion with the carrier tape to be bonded. These may be used alone or in combination of two or more.
- the thickness of the intermediate layer may be, for example, 10 ⁇ m or more and 30 ⁇ m or less, and preferably 15 ⁇ m or more and 25 ⁇ m or less, from the viewpoint of improving the adhesion with the carrier tape that is the object to be bonded.
- the cover tape according to the present embodiment may be provided with an adhesive layer between the base material layer and the sealant layer or between the base material layer and the antistatic layer. By doing so, the mechanical strength of the cover tape can be improved.
- the material for forming the adhesive layer described above contains a resin.
- resins include urethane-based dry laminate adhesive resins, anchor coat adhesive resins, and the like, and generally a combination of a polyester composition such as polyester polyol or polyether polyol and an isocyanate compound, or polybutadiene. Polyimine resin or the like can be used.
- the object includes the bottom surface of the carrier tape, etc., but has the possibility of coming into contact with the surface of the antistatic layer when accommodating and transporting the electronic component or mounting the electronic component. If it is a thing, it will not be limited.
- Specific examples of the material forming the object include materials for forming carrier tapes such as polystyrene, polyethylene terephthalate, and polycarbonate, polyethylene, rubber (material processed from natural rubber, synthetic rubber, etc.), and the like. .
- the manufacturing method of the cover tape in this embodiment is different from the conventional manufacturing method, and it is necessary to highly control the manufacturing conditions described later. That is, for the first time by a manufacturing method that highly controls various factors relating to the following two conditions, the surface resistance value R 50 on the surface of the antistatic layer measured at 23 ° C. and 50% RH, and at 23 ° C. and 30% RH It is possible to obtain a cover tape in which the measured ratio of the surface resistance value R 30 on the surface of the antistatic layer and the value of R 50 / R 30 satisfies the above-mentioned specific conditions.
- Composition of resin material for forming antistatic layer (2) Combination of material for forming antistatic layer and material for forming base material layer
- the cover tape in the present embodiment adopts various specific manufacturing conditions such as temperature setting of the manufacturing apparatus, on the premise that various factors related to the above two conditions are highly controlled. Can do.
- the cover tape in the present embodiment can be manufactured by adopting a known method except for highly controlling various factors related to the above two conditions.
- a positively charged positive compound and a negatively charged negative compound are used in combination with the antistatic layer, and these are well dispersed. It is mentioned as an element for appropriately controlling the characteristics included in the factors and making R 50 , R 30 , and R 50 / R 30 within a desired numerical range.
- an example of a cover tape manufacturing method will be described on the assumption that various factors related to the above two conditions are highly controlled.
- an antistatic layer is formed by applying a predetermined material to one surface of the base material layer and drying it.
- a sealant layer is laminated by extrusion lamination on the surface of the base material layer opposite to the surface on which the antistatic layer is formed.
- the cover tape which concerns on this embodiment can be produced.
- the manufacturing method of the cover tape in this embodiment is different from the conventional manufacturing method, and it is necessary to highly control the manufacturing conditions described later. That is, until the absolute value of the friction band voltage on the surface of the antistatic layer measured at 23 ° C. and 50% RH is attenuated from 5 kV to 50 V for the first time by a manufacturing method that highly controls various factors related to the following two conditions.
- the cover tape in the present embodiment adopts various specific manufacturing conditions such as temperature setting of the manufacturing apparatus, on the premise that various factors related to the above two conditions are highly controlled. Can do.
- the cover tape in the present embodiment can be manufactured by adopting a known method except for highly controlling various factors related to the above two conditions. Among these, for example, a positively charged positive compound and a negatively charged negative compound are used in combination, and these are well dispersed. Is controlled as appropriate, and the above S 50 , S 30 , and S 50 / S 30 are included as elements in a desired numerical range.
- an example of a cover tape manufacturing method will be described on the assumption that various factors related to the above two conditions are highly controlled.
- an antistatic layer is formed by applying a predetermined material to one surface of the base material layer and drying it.
- a sealant layer is laminated by extrusion lamination on the surface of the base material layer opposite to the surface on which the antistatic layer is formed.
- the cover tape according to this embodiment can be manufactured.
- the intermediate layer when forming the above-described intermediate layer, the intermediate layer may be laminated by extrusion lamination on the surface of the base material layer opposite to the surface on which the antistatic layer is formed. After the sheet is formed by the extrusion method, the obtained sheet may be laminated on the surface of the base material layer opposite to the surface on which the antistatic layer is formed.
- the material of the adhesive layer may be applied to the target surface by a conventionally known application method.
- Example A In Example A and Comparative Example A, the respective raw material components used for the production of the antistatic layer and the sealant layer are shown below.
- Antistatic agent A1 Conductive polymer containing polyethylenedioxythiophene / polystyrene sulfonic acid (PEDOT / PSS) based compound (manufactured by Heraeus, CLEVIOS P)
- Antistatic agent A2 tin dioxide (manufactured by Diary Catalysts)
- Antistatic agent A3 cationic low-molecular surfactant (manufactured by NOF Corporation, Elegan 264-30)
- Antistatic agent A4 cationic polymer surfactant (manufactured by Taisei Fine Chemical Co., Ltd., ACRYT 1SX-1090)
- Diluting solvent A2: toluene: methyl ethyl ketone 1: 1 Diluting solvent
- Positive binder resin A1 Carbodiimide (Nisshinbo Chemical Co., Ltd., Carbodilite V-02-L2)
- Positive binder resin A2 Acrylic resin (Aron S-1001 manufactured by Toa Gosei Co., Ltd.)
- Negative binder resin A3 water-soluble polyester resin (manufactured by Kyoyo Chemical Co., Ltd., plus coat Z760)
- Negative binder resin A4 water-soluble polyester resin (manufactured by Kyoyo Chemical Co., Ltd., plus coat Z565)
- Styrene- (meth) methyl acrylate copolymer manufactured by Nippon Steel Chemical Co., Ltd., Estyrene MS-600.
- St-MMA Styrene- (meth) methyl acrylate copolymer
- Ethylene-methyl acrylate copolymer Mitsubishi Chemical Co., Ltd., Elvalloy AC 1820, hereinafter also referred to as “EMA”
- EMA Ethylene-methyl acrylate copolymer
- PEG-PP Polyether / polyolefin copolymer
- a biaxially stretched polyester film (Toyobo Co., Ltd. product: E5102) having a thickness of 16 ⁇ m was prepared as a base material layer.
- the total light transmittance of the obtained base material layer was 87.7%.
- a material for forming the antistatic layer was prepared by the following method.
- the composition of each reagent is as shown in Table 1.
- the antistatic agent was stirred for 30 seconds while adding a diluent solvent.
- the binder resin and the surfactant were added, followed by stirring for 30 seconds. In this way, a material for forming a liquid antistatic layer was prepared.
- the material (liquid form) for forming the obtained antistatic layer was applied to one surface of the base material layer using a bar coater or a gravure coater so that the wet film thickness was 4 ⁇ m. Then, the antistatic layer was formed into a film by making it dry at 100 degreeC.
- a sealant layer was laminated by extrusion lamination on the surface of the base material layer opposite to the surface on which the antistatic layer was formed.
- a resin composition comprising 15 parts by weight of St-MMA, 65 parts by weight of EMA and 20 parts by weight of PEG-PP was used.
- the thickness of the sealant layer was 5 ⁇ m.
- the cover tape which concerns on Example A1, A2 was produced.
- the width of the obtained cover tape was 8 mm.
- a cover tape was prepared in the same manner as in Example A using a mixed solution of an antistatic agent and a diluting solvent obtained without adding a binder resin and a surfactant. .
- Total light transmittance The total light transmittance of the cover tape was measured according to JIS K7105 (1981). The unit is%.
- Friction band voltage The friction band voltage measured at 23 ° C. and 50% RH was measured by the method described in (1) to (7) below with reference to FIG. The unit is V.
- a plate-like rubber body 40 having a surface resistance value of 1.0 ⁇ 10 13 ⁇ or more was installed on the pedestal 30 with a wheel whose surface resistance value is less than 1.0 ⁇ 10 11 ⁇ .
- two insulators 50 were installed on the rubber body 40 at a predetermined interval.
- the insulator 50 is a quadrangular prism having a thickness of 10 mm or more and a surface resistance value of 1.0 ⁇ 10 13 ⁇ or more.
- a polystyrene sheet 70 manufactured by Electrochemical Co., Ltd., Clearen CST2401
- seat 70 is a friction target object made to contact with each cover tape in the measurement mentioned later.
- the wheeled pedestal 30 was always in a grounded state.
- the polystyrene sheet 70 was neutralized using an ionizer (BLH-H, manufactured by Kasuga Denki Co., Ltd.).
- the cover tape 10 was wound around a rod-shaped support 80 having a surface resistance value of less than 1.0 ⁇ 10 9 ⁇ so that the antistatic layer became the surface layer.
- a support made of a conductor made of a carbon kneaded film was used.
- the cover tape 10 was also neutralized by the same method as that for the polystyrene-based sheet 70.
- the cover tapes of Examples A1 and A2 were both excellent in antistatic properties associated with the peeling of the carrier tape, as well as the balance between the adhesiveness to the carrier tape and the peeling property.
- the cover tapes of Examples A1 and A2 include both a positive binder resin and a negative binder resin, and the antistatic layer is formed using a material including a conductive polymer. It was hard to generate.
- the cover tapes of Comparative Examples A1 and A2 have humidity dependency in terms of antistatic properties accompanying peeling of the carrier tape, and did not satisfy the required level. The obtained cover tape and a polystyrene carrier tape were rubbed, and the absolute value of the charged voltage on the surface of the cover tape was measured.
- Examples A1 and A2 have good anti-friction properties.
- Comparative Examples A1 and A2 were inferior in frictional antistatic properties.
- the obtained cover tape was heat-sealed on a carrier tape, and then wound on a seal to obtain a package for electronic parts wound up in a reel shape.
- Example B In Example B and Comparative Example B, the respective raw material components used for producing the antistatic layer and the sealant layer are shown below.
- Antistatic agent B1 Conductive polymer containing polyethylenedioxythiophene / polystyrene sulfonic acid (PEDOT / PSS) based compound (manufactured by Heraeus, CLEVIOS P)
- Antistatic agent B2 tin dioxide (manufactured by Diary Catalysts)
- Antistatic agent B3 cationic low-molecular surfactant (manufactured by NOF Corporation, Elegan 264-30)
- Antistatic agent B4 Cationic polymer surfactant (manufactured by Taisei Fine Chemical Co., Ltd., ACRYT 1SX-1090)
- B2: toluene: methyl ethyl ketone 1: 1 Diluting solvent
- B3 isopropyl alcohol
- Binder resin -Positive binder resin B1: Carbodiimide (Nisshinbo Chemical Co., Carbodilite V-02-L2) Positive binder resin B2: Acrylic resin (Aron S-1001 manufactured by Toa Gosei Co., Ltd.)
- Negative binder resin B4 water-soluble polyester resin (manufactured by Kyoyo Chemical Co., Ltd., plus coat Z565)
- Surfactant B1 BYK-3440 manufactured by Big Chemie Japan Surfactant B2: manufactured by San Nopco, SN Dispersant 9228
- Styrene- (meth) methyl acrylate copolymer manufactured by Nippon Steel Chemical Co., Ltd., Estyrene MS-600.
- St-MMA Styrene- (meth) methyl acrylate copolymer
- Ethylene-methyl acrylate copolymer Mitsubishi Chemical Co., Ltd., Elvalloy AC 1820, hereinafter also referred to as “EMA”
- EMA Ethylene-methyl acrylate copolymer
- PEG-PP Polyether / polyolefin copolymer
- a biaxially stretched polyester film (Toyobo Co., Ltd. product: E5102) having a thickness of 16 ⁇ m was prepared as a base material layer.
- the total light transmittance of the obtained base material layer was 87.7%.
- a material for forming the antistatic layer was prepared by the following method.
- the composition of each reagent is as shown in Table 2.
- the antistatic agent was stirred for 30 seconds while adding a diluent solvent.
- the binder resin and the surfactant were added, followed by stirring for 30 seconds. In this way, a material for forming a liquid antistatic layer was prepared.
- the material (in liquid form) for forming the obtained antistatic layer was applied to one surface of the base material layer using a bar coater or a gravure coater so that the wet thickness was 4 ⁇ m. Then, the antistatic layer was formed into a film by making it dry at 100 degreeC.
- a sealant layer was laminated by extrusion lamination on the surface of the base material layer opposite to the surface on which the antistatic layer was formed.
- a resin composition comprising 15 parts by weight of St-MMA, 65 parts by weight of EMA and 20 parts by weight of PEG-PP was used.
- the thickness of the sealant layer was 5 ⁇ m.
- the cover tape which concerns on Example B1, B2 was produced.
- the width of the obtained cover tape was 8 mm.
- Attenuation time of charged voltage the absolute value of the friction voltage on the surface of the antistatic layer measured using the method described later under three humidity conditions of 50% RH, 30% RH and 12% RH at a temperature of 23 ° C. The time until the value decayed from 5 kV to 50 V was measured. The unit is seconds (s). Further, in Table 1 below, the time until the friction band voltage value decays from +5 kV to +50 V is defined as S +, and the time until the friction band voltage value decays from ⁇ 5 kV to ⁇ 50 V is denoted as S ⁇ . did.
- Friction band voltage The friction band voltage measured at 23 ° C. and 50% RH was measured by the same method as in Example A with reference to FIG. The unit is V.
- Total light transmittance The total light transmittance of the cover tape was measured according to JIS K7105 (1981). The unit is%.
- the cover tapes of Examples B1 and B2 were both excellent in antistatic properties accompanying the peeling of the carrier tape, as well as the balance between the adhesiveness to the carrier tape and the peeling property.
- the cover tapes of Examples 1B and B2 include both a positive binder resin and a negative binder resin, and the antistatic layer is formed using a material containing a conductive polymer. It was hard to generate.
- the cover tapes of Comparative Examples B1 and B2 have humidity dependency in terms of antistatic properties accompanying peeling of the carrier tape, and did not satisfy the required level. The obtained cover tape and a polystyrene carrier tape were rubbed, and the absolute value of the charged voltage on the surface of the cover tape was measured.
- Examples B1 and B2 have good anti-friction properties.
- Comparative Examples B1 and B2 were inferior in frictional antistatic properties.
- the obtained cover tape was heat-sealed on a carrier tape, and then wound on a seal to obtain a package for electronic parts wound up in a reel shape.
- Example C In Example C, the raw material components used for the production of the antistatic layer are shown below.
- Positive compound C1 acrylate copolymer resin (manufactured by Toagosei Co., Ltd., Jurimer FC-80)
- Negative compound C1 water-soluble polyester resin (manufactured by Kyoyo Chemical Co., Ltd., plus coat Z565)
- Antistatic agent C1 Conductive polymer containing polyethylenedioxythiophene / polystyrene sulfonic acid (PEDOT / PSS) -based compound (Orgacon ICP1010, manufactured by Japan Agfa Materials)
- Diluent C1 Isopropyl alcohol
- Diluent C2 Water Neutralizer
- C1 Triethylamine (Wako Pure Chemical Industries, Ltd. TEA)
- Surfactant C1 BYK-3440 manufactured by Big Chemie Japan
- Example C ⁇ Production of Cover Tape According to Example C> First, a biaxially stretched polyester film (Toyobo Co., Ltd. product: E5102) having a thickness of 16 ⁇ m was prepared as a base material layer. The total light transmittance of the obtained base material layer was 87.7%.
- a material for forming the antistatic layer was prepared by the following method.
- the composition of the materials forming the antistatic layer is as shown in Table 3.
- the mixture was stirred for 30 seconds while adding a neutralizing agent and a diluting solvent to the antistatic agent.
- the binder resin and the surfactant were added, followed by stirring for 30 seconds. In this way, a material for forming a liquid antistatic layer was prepared.
- the material (in liquid form) for forming the obtained antistatic layer was applied to one surface of the base material layer using a bar coater or a gravure coater so that the wet thickness was 4 ⁇ m. Then, the antistatic layer was formed into a film by making it dry at 100 degreeC.
- a sealant layer was laminated by extrusion lamination on the surface of the base material layer opposite to the surface on which the antistatic layer was formed.
- a resin composition comprising 15 parts by weight of St-MMA, 65 parts by weight of EMA and 20 parts by weight of PEG-PP was used.
- the thickness of the sealant layer was 5 ⁇ m.
- cover tapes according to Examples C1 to C3 were produced.
- the widths of the obtained cover tapes were all 8 mm.
- the surface resistance value on the surface of the antistatic layer was measured according to IEC61340 under three humidity conditions of 50 RH%, 30 RH% and 12 RH% at a temperature of 23 ° C. The unit is ⁇ .
- Total light transmittance The total light transmittance of the cover tape was measured according to JIS K7105 (1981). The unit is%.
- the obtained cover tape and a polystyrene carrier tape were rubbed, and the absolute value of the charged voltage on the surface of the cover tape was measured. As a result, it was found that Examples C1 to C3 have good anti-friction properties.
- the obtained cover tape was heat-sealed on a carrier tape, and then wound on a seal to obtain a package for electronic parts wound up in a reel shape.
- the cover tapes of Examples C1 to C3 were all excellent in antistatic properties against friction generated during transportation or the like and antistatic properties accompanying peeling of the carrier tape.
- Example D In Example D, the respective raw material components used for the production of the antistatic layer and the sealant layer are shown below.
- Positive compound D1 Acrylic ester copolymer resin (Arakawa Chemical Industries, Ltd .: Aracoat CL910)
- Negative compound D1 water-soluble polyester resin (manufactured by Kyoyo Chemical Co., Ltd., plus coat Z565)
- Antistatic agent D1 Conductive polymer containing polyethylenedioxythiophene / polystyrene sulfonic acid (PEDOT / PSS) -based compound (Arakawa Chemical Co., Ltd., Aracoat ACS332)
- Styrene- (meth) methyl acrylate copolymer manufactured by Nippon Steel Chemical Co., Ltd., Estyrene MS-600.
- St-MMA Styrene- (meth) methyl acrylate copolymer
- Ethylene-methyl acrylate copolymer Mitsubishi Chemical Co., Ltd., Elvalloy AC 1820, hereinafter also referred to as “EMA”
- EMA Ethylene-methyl acrylate copolymer
- PEG-PP Polyether / polyolefin copolymer
- Example D ⁇ Preparation of Cover Tape for Electronic Component Packaging According to Example D> First, a biaxially stretched polyester film (Toyobo Co., Ltd. product: E5102) having a thickness of 25 ⁇ m was prepared as a base material layer. The total light transmittance of the obtained base material layer was 87.7%.
- a material for forming the antistatic layer was prepared by the following method.
- the composition of the material forming the antistatic layer is as shown in Table 4. It stirred for 30 seconds, adding the diluting solvent which mix
- the material (in liquid form) for forming the obtained antistatic layer was applied to one surface of the base material layer using a bar coater or a gravure coater so that the wet thickness was 4 ⁇ m. Thereafter, an antistatic layer was formed by drying at 100 ° C. for 1 minute.
- a sealant layer was laminated by extrusion lamination on the surface of the base material layer opposite to the surface on which the antistatic layer was formed.
- a resin composition comprising 15 parts by weight of St-MMA, 65 parts by weight of EMA and 20 parts by weight of PEG-PP was used.
- the thickness of the sealant layer was 5 ⁇ m.
- cover tapes for packaging electronic parts according to Examples D1 to D4 were produced.
- the widths of the obtained cover tapes were all 8 mm.
- the surface resistance value on the surface of the antistatic layer was measured according to IEC61340 under three humidity conditions of 50 RH%, 30 RH% and 12 RH% at a temperature of 23 ° C. The unit is ⁇ .
- Total light transmittance The total light transmittance of the cover tape was measured according to JIS K7105 (1981). The unit is%.
- the obtained cover tape and a polystyrene carrier tape were rubbed, and the absolute value of the charged voltage on the surface of the cover tape was measured.
- Examples D1 to D4 have good anti-friction properties.
- the obtained cover tape was heat-sealed on a carrier tape, and then wound on a seal to obtain a package for electronic parts wound up in a reel shape.
- the cover tapes of Examples D1 to D4 were all excellent in antistatic properties against friction generated during transportation and the antistatic properties associated with peeling of the carrier tape, regardless of the type of material constituting the carrier tape. It was a thing.
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Abstract
Description
本発明者は、従来のカバーテープについて各種の検討を行った結果、次のような課題を見出した。
電子部品を収容した包装体をリールに巻かれた状態で搬送する際に、搬送時の振動によってキャリアテープとカバーテープとを接着している面、すなわち、カバーテープにおけるシーラント層表面とは反対側の表面における摩擦により静電気が発生する。このような静電気により、包装体内に収容している電子部品が故障する、又は基盤実装時に貼り付きなどのトラブルを引き起こす場合がある。
このような知見に基づき、本発明者は、従来のカバーテープについて、シーラント層表面とは反対側の表面における静電気対策という点に改善の余地があることを見出した。
前記基材層の一方の面側に設けられるシーラント層と、
前記基材層の前記一方の面とは反対側の面に設けられる帯電防止層と、
を有する電子部品包装用カバーテープであって、
23℃、50%RHで測定した前記帯電防止層の表面における表面抵抗値の値をR50とし、23℃、30%RHで測定した前記帯電防止層の表面における表面抵抗値の値をR30としたとき、R50/R30の値が、0.35以上2.8以下である、電子部品包装用カバーテープが提供される。
前記基材層の一方の面側に設けられるシーラント層と、
前記基材層の前記一方の面とは反対側の面に設けられる帯電防止層と、
を有する電子部品包装用カバーテープであって、
前記帯電防止層の表面における摩擦帯電圧の絶対値が5kVから50Vに減衰するまでの帯電圧減衰時間について、23℃、50%RHで測定した前記帯電圧減衰時間の値をS50とし、23℃、30%RHで測定した前記帯電圧減衰時間の値をS30としたとき、S50/S30の値が0.7以上1以下である、電子部品包装用カバーテープが提供される。
また、本発明によれば、
電子部品を収納する部品収納部が所定の間隔で並んで形成されているキャリアテープと前記キャリアテープに形成された前記部品収納部を覆うように設けられたカバーテープとからなる部品収納テープで構成されており、
前記部品収納テープは、リール状に巻き取り可能であり、
前記カバーテープは、上記電子部品包装用カバーテープである、電子部品用包装体が提供される。
図1に示すように、本実施形態に係る電子部品包装用カバーテープ10(以下、「カバーテープ」とも示す。)は、基材層1と、基材層1の一方の面側に設けられるシーラント層2と、基材層1の上記一方の面とは反対側の面に設けられる帯電防止層3と、を有するものである。そして、かかるカバーテープ10は、23℃、50%RHで測定した帯電防止層3の表面における表面抵抗値の値をR50とし、23℃、30%RHで測定した帯電防止層3の表面における表面抵抗値の値をR30としたとき、R50/R30の値が、0.35以上2.8以下である。これにより、キャリアテープの剥離に伴う帯電防止性に優れたカバーテープを実現することができる。なお、上記表面抵抗値は、IEC61340に準じて測定することができる。
まず、カバーテープの使用方法について、図2を参照して説明する。図2に示すように、カバーテープ10は、電子部品の形状に合わせて凹状のポケット21が連続的に設けられたキャリアテープ20の蓋材として用いられる。具体的には、カバーテープ10は、キャリアテープ20のポケット21の開口部全面を覆うように、キャリアテープ20の表面に接着(例えば、ヒートシール)させて使用する。なお、後述においては、カバーテープ10と、キャリアテープ20とを接着して得られた構造体のことを、電子部品用の包装体100と称して説明する。
また、本実施形態の電子部品包装用カバーテープ(カバーテープ10)は、シート形状でもよく、リール状に巻き取り可能なロール形状でもよい。
このような知見から、本発明者は、従来のカバーテープには、シーラント層表面とは反対側の表面における静電気対策という点に改善の余地があることを見出した。
たとえば、通常の帯電防止対策として表面抵抗値を下げるという方法が考えられる。しかしながら、表面抵抗値を下げたとしても、摩擦帯電が生じてしまう事があった。こうした知見に基づいて検討した結果、作業環境を踏まえた上で帯電を抑制することにより、摩擦帯電の発生を抑制できると考えるに至った。
なお、上記カバーテープにおける帯電防止層の表面と、たとえば、キャリアテープ等の上記カバーテープにおける帯電防止層の表面と接触させる対象物表面とを除電する。次いで、対象物表面に対してカバーテープにおける帯電防止層の表面を、一方向に2回接触させ、公知の表面電位計を用いて上記摩擦帯電圧を測定する。なお、本実施形態に係る摩擦帯電圧は、公知の表面電位計により、帯電防止層の表面における摩擦帯電圧を直接測定して得られた結果を採用してもよいし、対象物表面における摩擦帯電圧を測定して得られた結果から算出した結果を採用してもよい。
基材層を構成する材料は、当該基材層に対して帯電防止層やシーラント層を積層してカバーテープを作製する際、キャリアテープに対してカバーテープを接着させる際、カバーテープの使用時等に外部から加わる応力に耐えうることができる程度の機械的強度、キャリアテープに対してカバーテープを接着させる際に加わる熱履歴に耐えうることができる程度の耐熱性を有したものであればよい。また、基材層を構成する材料の形態は、特に限定されないが、加工が容易である観点から、フィルム状でもよい。
本実施形態に係るカバーテープにおいて、シーラント層は、基材層における帯電防止層が設けられた面とは反対側の面に設けられる層である。かかるシーラント層の表面は、上述した方法でカバーテープを使用する場合、キャリアテープと接触することになる。本実施形態において、帯電防止層、基材層、およびシーラント層を含む多層構造とすることにより、キャリアテープに対する接着性と剥離性とのバランスとともに、帯電防止性に優れた電子部品包装用カバーテープを実現することができる。
本実施形態に係るカバーテープにおいて、帯電防止層は、基材層におけるシーラント層が設けられた面とは反対側の面に設けられる層である。かかる帯電防止層の表面は、上述したように、キャリアテープとカバーテープとからなる包装体に電子部品を収容して搬送する際に、キャリアテープの底面と接触する可能性を有している。
具体的には、負の化合物の固形分の含有量の下限値は、例えば、正の化合物の固形分と負の化合物の固形分との合計値100重量%に対して、50重量%以上が好ましく、60重量%以上が好ましく、70重量%以上がさらに好ましい。負の化合物の固形分の含有量の上限値は、特に限定されないが、例えば、正の化合物の固形分と負の化合物の固形分との合計値100重量%に対して、99重量%以下としてもよく、95重量%以下としてもよく、90重量%以下としてもよい。このように正の化合物と負の化合物とのバランスを図ることにより、摩擦帯電防止性に優れた帯電防止層の製造安定性を向上させることができる。
本実施形態に係るカバーテープは、基材層とシーラント層の間に中間層(図示せず)を設けてもよい。こうすることで、カバーテープ全体のクッション性を向上させるとともに、接着対象であるキャリアテープとの密着性を向上させることができる。
本実施形態におけるカバーテープの製造方法は、従来の製造方法とは異なるものであって、後述する製造条件を高度に制御する必要がある。すなわち、以下の2つの条件に係る各種因子を高度に制御する製造方法によって初めて、23℃、50%RHで測定した帯電防止層の表面における表面抵抗値R50と、23℃、30%RHで測定した帯電防止層の表面における表面抵抗値R30との比、R50/R30の値が、上述した特定の条件を満たすカバーテープを得ることができる。
(1)帯電防止層を形成する樹脂材料の配合組成
(2)帯電防止層を形成する材料と基材層を形成する材料との組み合わせ
まず、基材層の一方の面に所定の材料を塗布し乾燥させることによって、帯電防止層を形成する。次いで、基材層の帯電防止層を形成した面とは反対側の面にシーラント層を押出しラミネート法によって積層する。このようにして、本実施形態に係るカバーテープを作製することができる。なお、シーラント層を押出し加工法によりシート形成した後、基材層の帯電防止層を形成した面とは反対側の面に得られたシートを積層してもよい。
本実施形態におけるカバーテープの製造方法は、従来の製造方法とは異なるものであって、後述する製造条件を高度に制御する必要がある。すなわち、以下の2つの条件に係る各種因子を高度に制御する製造方法によって初めて、23℃、50%RHで測定した帯電防止層の表面における摩擦帯電圧の絶対値が5kVから50Vに減衰するまでの帯電圧減衰時間S50、23℃、30%RHで測定した帯電防止層の表面における摩擦帯電圧の絶対値が5kVから50Vに減衰するまでの帯電圧減衰時間S30、S50/S30の値が、上述した特定の条件を満たすカバーテープを得ることができる。
(1)帯電防止層を形成する樹脂材料の配合組成
(2)帯電防止層を形成する材料と基材層を形成する材料との組み合わせ
まず、基材層の一方の面に所定の材料を塗布し乾燥させることによって、帯電防止層を形成する。次いで、基材層の帯電防止層を形成した面とは反対側の面にシーラント層を押出しラミネート法によって積層する。このようにして、本実施形態に係るカバーテープは作製することができる。なお、シーラント層を押出し加工法によりシート形成した後、基材層の帯電防止層を形成した面とは反対側の面に得られたシートを積層してもよい。
実施例A及び比較例Aにおいて、帯電防止層およびシーラント層の作製に用いた各原料成分を下記に示した。
(帯電防止剤)
・帯電防止剤A1:ポリエチレンジオキシチオフェン/ポリスチレンスルホン酸(PEDOT/PSS)系の化合物を含む導電性ポリマー(ヘレウス社製、CLEVIOS P)
・帯電防止剤A2:二酸化錫(日記触媒社製)
・帯電防止剤A3:カチオン系低分子界面活性剤(日油社製、エレガン264-30)
・帯電防止剤A4:カチオン系高分子界面活性剤(大成ファインケミカル社製、アクリット1SX-1090)
・希釈溶剤A1:イソプロピルアルコール:水=1:1
・希釈溶剤A2:トルエン:メチルエチルケトン=1:1
・希釈溶剤A3:イソプロピルアルコール
・正のバインダー樹脂A1:カルボジイミド(日清紡ケミカル社製、カルボジライトV-02-L2)
・正のバインダー樹脂A2:アクリル樹脂(東亜合成社製、アロンS-1001)
・負のバインダー樹脂A3:水溶性ポリエステル樹脂(互応化学社製、プラスコートZ760)
・負のバインダー樹脂A4:水溶性ポリエステル樹脂(互応化学社製、プラスコートZ565)
・界面活性剤A1:ビックケミージャパン社製、BYK-3440
・界面活性剤A2:サンノプコ社製、SNディスパーサント9228
・スチレン-(メタ)アクリル酸メチル共重合体(新日鐵化学社製、エスチレンMS-600。以下「St―MMA」とも言う。)
・エチレン-アクリル酸メチル共重合体(三井・デュポンポリケミカル社製、エルバロイAC 1820。以下、「EMA」とも言う。)
・ポリエーテル/ポリオレフィン共重合体(三洋化成工業社製、ペレスタット212。以下「PEG-PP」とも言う。)
まず、基材層として、厚さが16μmの二軸延伸ポリエステルフィルム(東洋紡績株式会社製:E5102)を準備した。得られた基材層の全光線透過率は、87.7%であった。
帯電防止剤に対して、希釈溶剤を加えながら30秒間撹拌した。次に、基材密着性および分散安定性を高めるため、バインダー樹脂と界面活性剤を加えてから30秒間撹拌した。このようにして、液体状の帯電防止層を形成する材料を準備した。
帯電防止層は、表1に示すようにバインダー樹脂と界面活性剤を加えることなく得られた帯電防止剤と希釈溶剤の混合溶液を用いて、実施例Aと同様の方法でカバーテープを作製した。
・帯電防止層の表面における表面抵抗値:23℃という温度にて50RH%、30RH%および12RH%の3つの湿度条件下での帯電防止層の表面における表面抵抗値を、IEC61340に準じて測定した。なお、単位は、Ωである。
得られたカバーテープとポリスチレン製キャリアテープとを摩擦させて、カバーテープの表面の帯電圧の絶対値を測定した。その結果、実施例A1、A2については、摩擦帯電防止性が良好であることが分かった。一方、比較例A1、A2については、摩擦帯電防止性が劣ることが分かった。
また、得られたカバーテープをキャリアテープに熱シール後、シールに巻くことにより、リール状に巻き取られた電子部品用包装体が得られた。
実施例B及び比較例Bにおいて、帯電防止層およびシーラント層の作製に用いた各原料成分を下記に示した。
(帯電防止剤)
・帯電防止剤B1:ポリエチレンジオキシチオフェン/ポリスチレンスルホン酸(PEDOT/PSS)系の化合物を含む導電性ポリマー(ヘレウス社製、CLEVIOS P)
・帯電防止剤B2:二酸化錫(日記触媒社製)
・帯電防止剤B3:カチオン系低分子界面活性剤(日油社製、エレガン264-30)
・帯電防止剤B4:カチオン系高分子界面活性剤(大成ファインケミカル社製、アクリット1SX-1090)
・希釈溶剤B1:イソプロピルアルコール:水=1:1
・希釈溶剤B2:トルエン:メチルエチルケトン=1:1
・希釈溶剤B3:イソプロピルアルコール
・正のバインダー樹脂B1:カルボジイミド(日清紡ケミカル社製、カルボジライトV-02-L2)
・正のバインダー樹脂B2:アクリル樹脂(東亜合成社製、アロンS-1001)
・負のバインダー樹脂B3:水溶性ポリエステル樹脂(互応化学社製、プラスコートZ760)
・負のバインダー樹脂B4:水溶性ポリエステル樹脂(互応化学社製、プラスコートZ565)
・界面活性剤B1:ビックケミージャパン社製、BYK-3440
・界面活性剤B2:サンノプコ社製、SNディスパーサント9228
・スチレン-(メタ)アクリル酸メチル共重合体(新日鐵化学社製、エスチレンMS-600。以下「St―MMA」とも言う。)
・エチレン-アクリル酸メチル共重合体(三井・デュポンポリケミカル社製、エルバロイAC 1820。以下、「EMA」とも言う。)
・ポリエーテル/ポリオレフィン共重合体(三洋化成工業社製、ペレスタット212。以下「PEG-PP」とも言う。)
まず、基材層として、厚さが16μmの二軸延伸ポリエステルフィルム(東洋紡績株式会社製:E5102)を準備した。得られた基材層の全光線透過率は、87.7%であった。
帯電防止剤に対して、希釈溶剤を加えながら30秒間撹拌した。次に、基材密着性および分散安定性を高めるため、バインダー樹脂と界面活性剤を加えてから30秒間撹拌した。このようにして、液体状の帯電防止層を形成する材料を準備した。
帯電防止層を形成する材料として、バインダー樹脂と界面活性剤を加えることなく得られた帯電防止剤と希釈溶剤の混合溶液を用いた点以外は、実施例1および2と同様の方法でカバーテープを作製した。
・帯電圧減衰時間:23℃という温度にて50%RH、30%RHおよび12%RHの3つの湿度条件下、後述する方法を用いて測定された帯電防止層の表面における摩擦帯電圧の絶対値が5kVから50Vに減衰するまでの時間を測定した。なお、単位は、秒(s)である。さらに、下記表1においては、摩擦帯電圧の値が+5kVから+50Vに減衰するまでの時間を、S+とし、摩擦帯電圧の値が-5kVから-50Vに減衰するまでの時間を、S-とした。
得られたカバーテープとポリスチレン製キャリアテープとを摩擦させて、カバーテープの表面の帯電圧の絶対値を測定した。その結果、実施例B1、B2については、摩擦帯電防止性が良好であることが分かった。一方、比較例B1、B2については、摩擦帯電防止性が劣ることが分かった。
また、得られたカバーテープをキャリアテープに熱シール後、シールに巻くことにより、リール状に巻き取られた電子部品用包装体が得られた。
実施例Cにおいて、帯電防止層の作製に用いた各原料成分を下記に示した。
・正の化合物C1:アクリル酸エステル共重合体樹脂(東亜合成社製、ジュリマーFC-80)
・負の化合物C1:水溶性ポリエステル樹脂(互応化学社製、プラスコートZ565)
・帯電防止剤C1:ポリエチレンジオキシチオフェン/ポリスチレンスルホン酸(PEDOT/PSS)系の化合物を含む導電性ポリマー(日本アグフアマテリアルズ社製、Orgacon ICP1010)
・希釈剤C1:イソプロピルアルコール
・希釈剤C2:水
・中和剤C1:トリエチルアミン(和光純薬社製:TEA)
・界面活性剤C1:ビックケミージャパン社製、BYK-3440
まず、基材層として、厚さが16μmの二軸延伸ポリエステルフィルム(東洋紡績株式会社製:E5102)を準備した。得られた基材層の全光線透過率は、87.7%であった。
帯電防止剤に対して、中和剤と希釈溶剤を加えながら30秒間撹拌した。次に、基材密着性および分散安定性を高めるため、バインダー樹脂と界面活性剤を加えてから30秒間撹拌した。このようにして、液体状の帯電防止層を形成する材料を準備した。
また、得られたカバーテープをキャリアテープに熱シール後、シールに巻くことにより、リール状に巻き取られた電子部品用包装体が得られた。
実施例C1~C3のカバーテープは、いずれも、搬送時等に生じる摩擦に対する摩擦帯電防止性やキャリアテープの剥離に伴う帯電防止性に優れたものであった。
実施例Dにおいて、帯電防止層およびシーラント層の作製に用いた各原料成分を下記に示した。
(バインダー樹脂)
・正の化合物D1:アクリル酸エステル共重合体樹脂(荒川化学社製:アラコートCL910)
・負の化合物D1:水溶性ポリエステル樹脂(互応化学社製、プラスコートZ565)
・帯電防止剤D1:ポリエチレンジオキシチオフェン/ポリスチレンスルホン酸(PEDOT/PSS)系の化合物を含む導電性ポリマー(荒川化学社製:、アラコートACS332)
・希釈剤D1:イソプロピルアルコール
・希釈剤D2:水
・界面活性剤D1:荒川化学社製、アラコートACS347
・スチレン-(メタ)アクリル酸メチル共重合体(新日鐵化学社製、エスチレンMS-600。以下「St―MMA」とも言う。)
・エチレン-アクリル酸メチル共重合体(三井・デュポンポリケミカル社製、エルバロイAC 1820。以下、「EMA」とも言う。)
・ポリエーテル/ポリオレフィン共重合体(三洋化成工業社製、ペレスタット212。以下「PEG-PP」とも言う。)
まず、基材層として、厚さが25μmの二軸延伸ポリエステルフィルム(東洋紡績株式会社製:E5102)を準備した。得られた基材層の全光線透過率は、87.7%であった。
帯電防止剤に対して、イソプロピルアルコールと水とを所定の比率で配合した希釈溶剤を加えながら30秒間撹拌した。次に、基材密着性および分散安定性を高めるため、バインダー樹脂と界面活性剤を加えてから30秒間撹拌した。このようにして、液体状の帯電防止層を形成する材料を準備した。
また、得られたカバーテープをキャリアテープに熱シール後、シールに巻くことにより、リール状に巻き取られた電子部品用包装体が得られた。
実施例D1~D4のカバーテープは、いずれも、キャリアテープを構成する素材の種類に関係なく、搬送時等に生じる摩擦に対する摩擦帯電防止性や該キャリアテープの剥離に伴う帯電防止性に優れたものであった。
Claims (17)
- 基材層と、
前記基材層の一方の面側に設けられるシーラント層と、
前記基材層の前記一方の面とは反対側の面に設けられる帯電防止層と、
を有する電子部品包装用カバーテープであって、
23℃、50%RHで測定した前記帯電防止層の表面における表面抵抗値の値をR50とし、23℃、30%RHで測定した前記帯電防止層の表面における表面抵抗値の値をR30としたとき、R50/R30の値が、0.35以上2.8以下である、電子部品包装用カバーテープ。 - 請求項1に記載の電子部品包装用カバーテープであって、
23℃、50%RHで測定した前記帯電防止層の表面における表面抵抗値の値をR50とし、23℃、12%RHで測定した前記帯電防止層の表面における表面抵抗値の値をR12としたとき、R50/R12の値が、0.1以上10以下である、電子部品包装用カバーテープ。 - 基材層と、
前記基材層の一方の面側に設けられるシーラント層と、
前記基材層の前記一方の面とは反対側の面に設けられる帯電防止層と、
を有する電子部品包装用カバーテープであって、
前記帯電防止層の表面における摩擦帯電圧の絶対値が5kVから50Vに減衰するまでの帯電圧減衰時間について、23℃、50%RHで測定した前記帯電圧減衰時間の値をS50とし、23℃、30%RHで測定した前記帯電圧減衰時間の値をS30としたとき、S50/S30の値が0.7以上1以下である、電子部品包装用カバーテープ。 - 請求項3に記載の電子部品包装用カバーテープであって、
23℃、50%RHで測定した前記帯電圧減衰時間の値をS50とし、23℃、12%RHで測定した前記帯電圧減衰時間の値をS12としたとき、S50/S12の値が、0.2以上1以下である、電子部品包装用カバーテープ。 - 請求項1から4のいずれか1項に記載の電子部品包装用カバーテープであって、
当該電子部品包装用カバーテープの全光線透過率が、80%以上である、電子部品包装用カバーテープ。 - 請求項1から5のいずれか1項に記載の電子部品包装用カバーテープであって、
当該電子部品包装用カバーテープの前記帯電防止層の表面に対して、ポリスチレンからなる材料により形成されたシートを重ね合わせ、前記表面に対して前記シートを速度100mm/sで50mmの間隔で2回摩擦させてから5秒後に、23℃、50%RHで測定した摩擦帯電圧が、-1800V以上1800V以下である、電子部品包装用カバーテープ。 - 請求項1から6のいずれか1項に記載の電子部品包装用カバーテープであって、
前記帯電防止層が、エステル化合物を含む、電子部品包装用カバーテープ。 - 請求項1から7のいずれか1項に記載の電子部品包装用カバーテープであって、
前記帯電防止層が、正に帯電する正の化合物と負に帯電する負の化合物とを含む、電子部品包装用カバーテープ。 - 請求項8に記載の電子部品包装用カバーテープであって、
前記負の化合物の固形分の含有量が、前記正の化合物の固形分と前記負の化合物の固形分との合計値100重量%に対して、50重量%以上である、電子部品包装用カバーテープ。 - 請求項1から9のいずれか1項に記載の電子部品包装用カバーテープであって、
前記帯電防止層が、導電ポリマーを含む、電子部品包装用カバーテープ。 - 請求項1から10のいずれか1項に記載の電子部品包装用カバーテープであって、
前記帯電防止層が、界面活性剤を含む、電子部品包装用カバーテープ。 - 請求項1から11のいずれか1項に記載の電子部品包装用カバーテープであって、
前記帯電防止層の膜厚が、1μm以上20μm以下である、電子部品包装用カバーテープ。 - 請求項1から12のいずれか1項に記載の電子部品包装用カバーテープであって、
前記シーラント層の表面抵抗値が、23℃、50RH%の条件で105Ω以上1011Ω以下である、電子部品包装用カバーテープ。 - 請求項1から13のいずれか1項に記載の電子部品包装用カバーテープであって、
前記シーラント層の膜厚が、1μm以上15μm以下である、電子部品包装用カバーテープ。 - 請求項1から14のいずれか1項に記載の電子部品包装用カバーテープであって、
前記基材層の全光線透過率が、80%以上である、電子部品包装用カバーテープ。 - 請求項1から15のいずれか1項に記載の電子部品包装用カバーテープであって、
当該電子部品包装用カバーテープの幅が2mm以上100mm以下である、電子部品包装用カバーテープ。 - 電子部品を収納する部品収納部が所定の間隔で並んで形成されているキャリアテープと前記キャリアテープに形成された前記部品収納部を覆うように設けられたカバーテープとからなる部品収納テープで構成されており、
前記部品収納テープは、リール状に巻き取り可能であり、
前記カバーテープは、請求項1から16のいずれか1項に記載の電子部品包装用カバーテープである、電子部品用包装体。
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JP2016543252A JP6011750B1 (ja) | 2015-03-10 | 2016-03-01 | 電子部品包装用カバーテープおよび電子部品用包装体 |
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JP2019199013A (ja) * | 2018-05-16 | 2019-11-21 | 住友ベークライト株式会社 | カバーテープおよび電子部品包装体 |
WO2021070935A1 (ja) * | 2019-10-11 | 2021-04-15 | 大日本印刷株式会社 | 電子部品包装用カバーテープおよび包装体 |
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JP2005178811A (ja) * | 2003-12-17 | 2005-07-07 | Nitto Denko Corp | 電子部品搬送用ボトムカバーテープ及び電子部品搬送体 |
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JPH11286079A (ja) * | 1998-04-02 | 1999-10-19 | Toyo Chem Co Ltd | カバーテープ |
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TW200426030A (en) * | 2003-04-24 | 2004-12-01 | Dainippon Printing Co Ltd | Electronic part taping packaging cover tape |
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US8828535B2 (en) * | 2008-11-12 | 2014-09-09 | Denki Kagaku Kogyo Kabushiki Kaisha | Cover tape |
US8584859B2 (en) * | 2009-07-22 | 2013-11-19 | Sumitomo Bakelite Co., Ltd | Cover tape for packaging electronic part and electronic part package |
JP2012214252A (ja) * | 2010-09-30 | 2012-11-08 | Sumitomo Bakelite Co Ltd | 電子部品包装用カバーテープ |
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JP2005178811A (ja) * | 2003-12-17 | 2005-07-07 | Nitto Denko Corp | 電子部品搬送用ボトムカバーテープ及び電子部品搬送体 |
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WO2021070935A1 (ja) * | 2019-10-11 | 2021-04-15 | 大日本印刷株式会社 | 電子部品包装用カバーテープおよび包装体 |
JP2021062881A (ja) * | 2019-10-11 | 2021-04-22 | 大日本印刷株式会社 | 電子部品包装用カバーテープおよび包装体 |
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JP6011750B1 (ja) | 2016-10-19 |
PH12017501660A1 (en) | 2018-03-19 |
TWI663109B (zh) | 2019-06-21 |
KR101876696B1 (ko) | 2018-07-09 |
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