JP2017223601A - Radiation shield sheet - Google Patents
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- JP2017223601A JP2017223601A JP2016120465A JP2016120465A JP2017223601A JP 2017223601 A JP2017223601 A JP 2017223601A JP 2016120465 A JP2016120465 A JP 2016120465A JP 2016120465 A JP2016120465 A JP 2016120465A JP 2017223601 A JP2017223601 A JP 2017223601A
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- 230000005855 radiation Effects 0.000 title claims abstract description 68
- 239000004744 fabric Substances 0.000 claims abstract description 63
- 229920005989 resin Polymers 0.000 claims abstract description 58
- 239000011347 resin Substances 0.000 claims abstract description 58
- 239000000835 fiber Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 13
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 90
- 239000010410 layer Substances 0.000 claims description 81
- 229910052721 tungsten Inorganic materials 0.000 claims description 20
- 239000010937 tungsten Substances 0.000 claims description 20
- 239000002344 surface layer Substances 0.000 claims description 13
- 229920005992 thermoplastic resin Polymers 0.000 claims description 9
- 239000002759 woven fabric Substances 0.000 claims description 8
- 229910001651 emery Inorganic materials 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 claims description 3
- 229910001930 tungsten oxide Inorganic materials 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims 1
- 238000005192 partition Methods 0.000 abstract description 8
- 238000003475 lamination Methods 0.000 abstract 1
- 238000005202 decontamination Methods 0.000 description 18
- 230000003588 decontaminative effect Effects 0.000 description 18
- 238000005452 bending Methods 0.000 description 14
- 238000000576 coating method Methods 0.000 description 13
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 12
- 230000001681 protective effect Effects 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 9
- 239000000463 material Substances 0.000 description 7
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- 239000000126 substance Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- 239000000839 emulsion Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 239000000356 contaminant Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 229920003051 synthetic elastomer Polymers 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
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- 239000005038 ethylene vinyl acetate Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009940 knitting Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 238000009958 sewing Methods 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
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- 230000007613 environmental effect Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- TVFDJXOCXUVLDH-RNFDNDRNSA-N cesium-137 Chemical compound [137Cs] TVFDJXOCXUVLDH-RNFDNDRNSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 229920006239 diacetate fiber Polymers 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- -1 for example Chemical compound 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000011366 tin-based material Substances 0.000 description 1
- 229920006304 triacetate fiber Polymers 0.000 description 1
Abstract
Description
本発明は、放射線汚染物の輸送や保管に用いるコンテナバッグ、除染物質充填コンテナバッグの貯蔵スペースに用いるシールドカバー、除染物質充填コンテナバッグなどを輸送するトラック幌及び荷台カバー、除染現場に敷き詰めるフロアシート、除染現場の間仕切りシート、除染現場の遮水シート、フレキシブル水槽、及び放射線医療機器附帯の防護シートなどに用いる放射線遮蔽シートに関するものである。 The present invention relates to a container bag used for transporting and storing radiation contaminants, a shield cover used for a storage space for a container bag filled with decontamination material, a truck hood and a cargo bed cover for transporting a container bag filled with decontamination material, and a decontamination site. The present invention relates to a radiation shielding sheet used as a floor sheet to be spread, a partition sheet at a decontamination site, a water shielding sheet at a decontamination site, a flexible water tank, and a protective sheet attached to a radiation medical device.
福島第一原子力発電所の事故により現在も放射線汚染物の除去作業が継続されており、作業の安全性が問題となっている。従来、放射線遮蔽材として、放射線遮蔽性能に優れた鉛を含有したものが使われている。鉛は環境対策による規制物質にも選定されており、その取り扱いは制限されて一般生活環境での使用は好ましくない為、現在は鉛に替わる放射線遮蔽材料に関する検討が多くなされている。鉛に替わる材料としては、安価で環境に対する影響が鉛に比べて少ない硫酸バリウムが挙げられる。しかし、硫酸バリウムは鉛よりも比重が軽く放射線遮蔽性能が大きく劣る為に放射線遮蔽層を形成するには層内に多量に添加する必要性があり、加工性が悪くなる。一方、タングステンは鉛と比較して環境に対する影響が少なく、硫酸バリウムと比較して高比重である為に放射線遮蔽性能の向上が見込める。 Due to the accident at the Fukushima Daiichi Nuclear Power Station, the work to remove radiation contaminants is still ongoing, and the safety of the work has become a problem. Conventionally, as a radiation shielding material, a material containing lead having excellent radiation shielding performance has been used. Lead is also selected as a regulated substance by environmental measures, and its use is restricted and its use in the general living environment is not preferable. Therefore, studies on radiation shielding materials that replace lead are currently being conducted. An example of a material that can replace lead is barium sulfate, which is inexpensive and has less environmental impact than lead. However, since barium sulfate has a specific gravity lighter than lead and its radiation shielding performance is greatly inferior, it is necessary to add a large amount in the layer in order to form a radiation shielding layer, and the workability is deteriorated. On the other hand, tungsten has less influence on the environment than lead, and has higher specific gravity than barium sulfate. Therefore, improvement in radiation shielding performance can be expected.
特許文献１には、熱可塑性樹脂１００質量部に対して、スズ系材料を５〜５００質量部、タングステン系材料を９００〜１２００質量部含有するシート状の放射線遮蔽体を布帛と一体化させて、当該布帛を所望の形状に縫合してなる放射線防護衣が開示されている。しかし、多量の金属材料を含む放射線遮蔽体は脆く、布帛との接着性にも劣るため、放射線防護衣を着用時の屈曲によりひび割れ易く、さらに布帛から剥がれ易いという問題を有している。そこで、放射線汚染物の輸送や保管に用いるコンテナバッグ、除染物質充填コンテナバッグの貯蔵スペースに用いるシールドカバー、除染物質充填コンテナバッグなどを輸送するトラック幌及び荷台カバー、除染現場に敷き詰めるフロアシート、除染現場の間仕切りシート、除染現場の遮水シート、フレキシブル水槽、及び放射線医療機器附帯の防護シートなどの放射線関連作業現場での安全性が見込める高遮蔽性能を有し、しかも耐屈曲性に優れる放射線遮蔽シートが望まれていた。 In Patent Document 1, a sheet-shaped radiation shield containing 5 to 500 parts by mass of a tin-based material and 900 to 1200 parts by mass of a tungsten-based material with respect to 100 parts by mass of a thermoplastic resin is integrated with a fabric. A radiation protective garment formed by stitching the fabric into a desired shape is disclosed. However, since the radiation shield containing a large amount of metal material is brittle and inferior in adhesion to the fabric, it has a problem that it is easily cracked due to bending when the radiation protective clothing is worn, and further easily peeled off from the fabric. Therefore, container bags used for transport and storage of radioactive contaminants, shield covers used for storage spaces for container bags filled with decontamination substances, truck hoods and cargo bed covers for transporting decontamination substance-filled container bags, floors spread on decontamination sites Sheets, partition sheets at decontamination sites, water shielding sheets at decontamination sites, flexible water tanks, protective sheets attached to radiological medical devices, etc. A radiation shielding sheet having excellent properties has been desired.
本発明は、かかる技術的背景を鑑み、放射線汚染物の輸送や保管に用いるコンテナバッグ、除染物質充填コンテナバッグの貯蔵スペースに用いるシールドカバー、除染物質充填コンテナバッグなどを輸送するトラック幌及び荷台カバー、除染現場に敷き詰めるフロアシート、除染現場の間仕切りシート、除染現場の遮水シート、フレキシブル水槽、及び放射線医療機器附帯の防護シート、などの放射線関連作業現場での安全性が見込める高遮蔽性能を有し、しかも耐屈曲性に優れる放射線遮蔽シートの提供を目的としている。 In view of such technical background, the present invention provides a container bag used for transporting and storing radiation contaminants, a shield cover used for a storage space for a decontamination substance-filled container bag, a truck hood for transporting a decontamination substance-filled container bag, and the like. Safety at radiation-related work sites such as cargo bed covers, floor sheets spread at decontamination sites, partition sheets at decontamination sites, water shielding sheets at decontamination sites, flexible water tanks, and protective sheets attached to radiation medical equipment can be expected. The object is to provide a radiation shielding sheet having high shielding performance and excellent bending resistance.
本発明の放射線遮蔽シートは、（１）経糸及び／または緯糸に短繊維紡績糸を含んでなる起毛布地を基布として、この起毛布地の一面上にタングステン類粉末充填樹脂層が形成され、もう一方の一面上にタングステン類粉末非含有樹脂層が形成された可撓性積層体であって、少なくともタングステン類粉末充填樹脂層内に起毛布地の起毛部が埋没し、（２）布地が、短繊維紡績糸を２５〜１００質量％含む織物または編物であって、（３）布地のカバーファクターが１８００〜２４００であり、（４）起毛布地の起毛部が、短繊維紡績糸から解れた毛羽で、針布起毛、またはエメリー起毛処理によって毛羽立ちしたもので、（５）タングステン類粉末充填樹脂層は少なくともタングステン類粉末及び熱可塑性樹脂との構成要素から成り、タングステン類粉末が、タングステン金属粉末及び／または酸化タングステン粉末であり、（６）タングステン類粉末充填樹脂層が表層及び内層とで構成され、表層：内層の厚さ比が１：１０〜１：５であり、内層に含有するタングステン類粉末の質量含有率が表層よりも１．１〜１．５倍大きく、かつ内層内に起毛布地の起毛部が埋没したものとすることで完成に至った。 In the radiation shielding sheet of the present invention, (1) a tungsten powder-filled resin layer is formed on one surface of a raised fabric including a warp and / or weft containing short fiber spun yarn as a base fabric. A flexible laminate having a tungsten powder-free resin layer formed on the other surface, wherein at least the tungsten powder-filled resin layer has a raised portion of the raised fabric buried therein, and (2) the fabric Is a woven fabric or a knitted fabric containing 25 to 100% by mass of short fiber spun yarn, (3) the cover factor of the fabric is 1800 to 2400, and (4) the raised portion of the raised fabric is formed from the short fiber spun yarn. An unraveled fluff that has been fuzzed by a needle cloth raising or an emery raising process. (5) The tungsten powder-filled resin layer comprises at least components of tungsten powder and a thermoplastic resin. The stainless powder is a tungsten metal powder and / or a tungsten oxide powder, and (6) the tungsten powder-filled resin layer is composed of a surface layer and an inner layer, and the thickness ratio of the surface layer: the inner layer is 1:10 to 1: 5. The mass content of the tungsten powder contained in the inner layer is 1.1 to 1.5 times larger than that of the surface layer, and the raised portion of the raised fabric is buried in the inner layer. .
本発明によれば、鉛よりも安全性が高いタングステンを使用して、高い放射線遮蔽性を有しながら柔軟性を有し、耐屈曲性に優れた放射線遮蔽シートを得ることが可能となる。本発明の放射線遮蔽シートは、縫製などの二次加工時の屈曲によるタングステン類粉末充填樹脂層のひび割れや剥離が起こりにくい事から放射線防護服への二次加工に好適に用いる事が出来、従来に比べて耐久性・安全性に優れた、放射線汚染物の輸送や保管に用いるコンテナバッグ、除染物質充填コンテナバッグの貯蔵スペースに用いるシールドカバー、除染物質充填コンテナバッグなどを輸送するトラック幌及び荷台カバー、除染現場に敷き詰めるフロアシート、除染現場の間仕切りシート、除染現場の遮水シート、フレキシブル水槽、及び放射線医療機器附帯の防護シート、などを得る事が出来る。 ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to obtain the radiation shielding sheet which has flexibility while having high radiation shielding property, and was excellent in bending resistance, using tungsten whose safety is higher than lead. The radiation shielding sheet of the present invention can be suitably used for secondary processing to radiation protective clothing because it is difficult for cracking and peeling of the tungsten powder-filled resin layer due to bending during secondary processing such as sewing. A truck hood that transports container bags used for transporting and storing radioactive contaminants, shield covers used for storage space for decontaminated substance-filled container bags, container bags filled with decontaminated substances, etc. In addition, a cargo bed cover, a floor sheet spread on the decontamination site, a partition sheet on the decontamination site, a water shielding sheet at the decontamination site, a flexible water tank, and a protective sheet attached to the radiation medical device can be obtained.
本発明の放射線遮蔽シートは、表面起毛を有する布地を基布として、起毛面に形成されるタングステン類粉末及び熱可塑性樹脂との構成要素から成るタングステン類粉末充填樹脂層と、タングステン類粉末充填樹脂層の反対面に形成されるタングステン類粉末非含有樹脂層から構成される。本発明に用いられる布地としては、短繊維紡績糸を２５〜１００質量％含む織物または編物であることが好ましい。短繊維紡績糸を２５質量％以上含むことで、タングステン類粉末充填樹脂層形成時に加工液の一部が基布に含浸されやすくなり、起毛布地の起毛部の一部をタングステン類粉末充填樹脂層に埋没させることが出来る。短繊維紡績糸が２５質量％未満では、起毛布地の起毛部の埋没が不十分となり、屈曲時にタングステン類粉末充填樹脂層が基布から剥離しやすくなる場合がある。短繊維紡績糸は１０番手（５９１ｄｔｅｘ）〜６０番手（９７ｄｔｅｘ）の範囲、特に１０番手（５９１ｄｔｅｘ）、１４番手（４２２ｄｔｅｘ）、１６番手（３７０ｄｔｅｘ）、２０番手（２９５ｄｔｅｘ）、２４番手（２４６ｄｔｅｘ）、３０番手（１９７ｄｔｅｘ）が適している。短繊維紡績糸が１０番手より太いと布地が厚くなってしまい、得られる放射線遮蔽シートの柔軟性が損なわれてしまう事がある。短繊維紡績糸が６０番手より細いと布地の引裂強力が充分に得られず、放射線防護服として着用した際に損傷を受けやすくなり、充分な放射線遮蔽性能を発揮できない事がある。前記布地は、使用目的に応じて、平織り、綾織、丸編、緯編、及び経編などの編織物を選ぶことができ、またその目付は５０〜１０００ｇ／ｍ２程度で、特に１００〜３５０ｇ／ｍ２が好ましい。 The radiation shielding sheet of the present invention includes a tungsten powder-filled resin layer composed of a tungsten powder and a thermoplastic resin, and a tungsten powder-filled resin. It is comprised from the tungsten powder non-containing resin layer formed in the opposite surface of a layer. The fabric used in the present invention is preferably a woven or knitted fabric containing 25 to 100% by mass of short fiber spun yarn. By containing 25% by mass or more of short fiber spun yarn, part of the processing liquid is easily impregnated into the base fabric when forming the tungsten powder-filled resin layer, and part of the raised portion of the raised fabric is filled with tungsten powder-filled resin. Can be buried in layers. When the short fiber spun yarn is less than 25% by mass, the raised portion of the raised fabric is not sufficiently buried, and the tungsten powder-filled resin layer may be easily peeled off from the base fabric when bent. Short fiber spun yarn ranges from 10th (591 dtex) to 60th (97 dtex), especially 10th (591 dtex), 14th (422 dtex), 16th (370 dtex), 20th (295 dtex), 24th (246 dtex), 30th (197 dtex) is suitable. If the short fiber spun yarn is thicker than 10th, the fabric becomes thick, and the flexibility of the resulting radiation shielding sheet may be impaired. If the short fiber spun yarn is thinner than 60th, the tear strength of the fabric cannot be obtained sufficiently, and it becomes easy to be damaged when worn as a radiation protective clothing, and sufficient radiation shielding performance may not be exhibited. The fabric can be selected from knitted fabrics such as plain weave, twill, circular knitting, weft knitting, and warp knitting according to the purpose of use, and the basis weight is about 50 to 1000 g / m 2 , particularly 100 to 350 g. / M 2 is preferred.
本発明において短繊維紡績糸としては、ＰＥ繊維、ＰＰ繊維、ビニロン繊維、ポリエステル繊維（ＰＥＴ、ＰＢＴ、ＰＴＴ、ＰＥＮ、ＰＢＮなど）、ポリアミド繊維（ナイロン６６、ナイロン６など）、などの合成繊維、木綿、麻などの天然繊維、ビスコースレーヨン、キュプラなどの再生繊維、ジアセテート繊維、トリアセテート繊維などの半合成繊維、炭素繊維などから選択した１種または複数種の紡績糸、あるいは混紡糸などを用いることができる。 In the present invention, the short fiber spun yarn includes PE fiber, PP fiber, vinylon fiber, polyester fiber (PET, PBT, PTT, PEN, PBN, etc.), synthetic fiber such as polyamide fiber (nylon 66, nylon 6, etc.), Natural fiber such as cotton and linen, recycled fiber such as viscose rayon and cupra, semi-synthetic fiber such as diacetate fiber and triacetate fiber, one or more kinds of spun yarn selected from carbon fiber, or mixed yarn Can be used.
前記布地はタングステン類粉末充填樹脂層、及びタングステン類粉末非含有樹脂層を積層する際のコーティング加工時の裏抜け防止として、カバーファクターが１８００〜２４００であることが好ましく、最も好ましくは１９５０〜２１００である。カバーファクターが１８００未満では、コーティング加工時に加工液が裏抜けして、タングステン類粉末充填樹脂層にピンホールを生じるなどして、得られるシートの放射線遮蔽性能が充分に得られない事がある。カバーファクターが２４００を超えると、放射線遮蔽シートが剛直となり、縫製などの二次加工が困難になり、コンテナバッグ、シールドカバー、トラックの荷台幌、フロアシート、間仕切りシート、遮水シート及び放射線医療機器附帯の防護シートなどに用いた時のフレキシブル性を損う事がある。なお、カバーファクターとは、糸密度と糸の太さより、下記式で求められる値であり、大きければ大きいほど織密度が高く、糸間の隙間が小さいことを意味する。
カバーファクター（ＣＦ）＝ｘ・ｄ１／２ ＋ｙ・ｄ’１／２
ｘ ：布地の２．５４ｃｍ当たりの経糸本数
ｙ ：布地の２．５４ｃｍ当たりの緯糸本数
ｄ ：経糸のトータル繊度（デシテックス）
ｄ’：緯糸のトータル繊度（デシテックス）
The cloth preferably has a cover factor of 1800 to 2400, most preferably 1950 to 2100 as a back-through prevention during coating processing when a tungsten powder-filled resin layer and a tungsten powder-free resin layer are laminated. It is. If the cover factor is less than 1800, the working fluid may be exposed through the coating process, causing pinholes in the tungsten powder-filled resin layer, and the resulting sheet may not have sufficient radiation shielding performance. When the cover factor exceeds 2400, the radiation shielding sheet becomes rigid and secondary processing such as sewing becomes difficult, and container bags, shield covers, truck bed tops, floor sheets, partition sheets, water shielding sheets, and radiological medical equipment The flexibility may be impaired when used for incidental protective sheets. The cover factor is a value obtained by the following formula from the yarn density and the thickness of the yarn, and the larger the value, the higher the weave density and the smaller the gap between the yarns.
Cover factor (CF) = x · d 1/2 + y · d ′ 1/2
x: number of warps per 2.54 cm of the fabric y: number of wefts per 2.54 cm of the fabric d: total fineness of the warp (decitex)
d ': Total fineness of the weft (decitex)
前記布地の針布起毛による起毛度合は針密度[本／ｃｍ２]で現し、１００本／ｃｍ２以上の度合で起毛処理していることが好ましい。一方、エメリー起毛による起毛度合は１００番手前後の研磨紙を使い、１〜３回起毛処理していることが好ましい。起毛処理から生じた毛羽が放射線遮蔽層と立体的に密着することにより、耐摩耗性に優れ、縫製などの二次加工時の屈曲によるタングステン類粉末充填樹脂層のひび割れや剥離を抑止する事が出来、耐久性・安全性に優れた放射線遮蔽シートを得る事が出来る。本発明に於いては、少なくともタングステン類粉末充填樹脂層の形成面が起毛されていればよい。 The raising degree of the fabric by raising the needle cloth is expressed by a needle density [lines / cm 2 ], and it is preferable that the raising treatment is performed at a degree of 100 pieces / cm 2 or more. On the other hand, it is preferable that the degree of raising by emery raising is raised 1 to 3 times by using about 100th abrasive paper. The fluff resulting from the raising process is three-dimensionally in close contact with the radiation shielding layer, providing excellent wear resistance and preventing cracking and peeling of the tungsten powder-filled resin layer due to bending during secondary processing such as sewing. It is possible to obtain a radiation shielding sheet excellent in durability and safety. In the present invention, at least the surface on which the tungsten powder-filled resin layer is formed should be raised.
本発明のタングステン類粉末充填樹脂層には、バインダーの熱可塑性樹脂（例えば軟質塩化ビニル樹脂、ウレタン樹脂、エチレン−酢酸ビニル共重合体など）に対して５０質量％以上のタングステン類粉末を含むことが必須であり、更に好ましくは８０質量％以上である。タングステン類粉末の含有量が５０質量％未満の場合、放射線遮蔽性能が劣るものとなり、性能の低い遮蔽層を厚く塗工しても高い放射線遮蔽性を発現できない事がある。タングステン類粉末には格別の制限はなく、例えば市販のタングステン金属粉末、酸化タングステン粉末などから適宜選択して用いることができる。市販品のタングステン類粉末は固体粉末状であり、一般の粉末冶金には粒度２〜５μｍが用いられるが、本発明においては３〜１０μｍが通常、好ましくは３〜５μｍ、最も好ましくは３．５μｍ前後である。また、タングステン類粉末非含有樹脂層は、タングステン類粉末充填樹脂層からタングステン類粉末を省略した、例えば軟質塩化ビニル樹脂、ウレタン樹脂などによるコーティング層、及び／またはフィルム層であることが屈曲耐久性及び耐摩耗性に優れ最も好ましいが、タングステン類粉末以外の充填剤、例えば硫酸バリウムなど、または顔料を含有する着色層であってもよい。本発明の放射線遮蔽シートをコンテナバッグ、シールドカバー、トラックの荷台幌、フロアシート、間仕切りシート、遮水シート及び放射線医療機器附帯の防護シートなどに用いる際には、タングステン類粉末非含有樹脂層側を露出面（表面）側とすることで更に屈曲耐久性と耐摩耗性が向上する。 The tungsten powder-filled resin layer of the present invention contains 50% by mass or more of tungsten powder with respect to the binder thermoplastic resin (for example, soft vinyl chloride resin, urethane resin, ethylene-vinyl acetate copolymer, etc.). Is essential, and more preferably 80% by mass or more. When the content of the tungsten powder is less than 50% by mass, the radiation shielding performance is inferior, and even if the shielding layer having a low performance is applied thick, high radiation shielding properties may not be exhibited. There is no special restriction | limiting in tungsten powder, For example, it can select and use suitably from commercially available tungsten metal powder, tungsten oxide powder, etc. Commercially available tungsten powders are in the form of a solid powder, and a particle size of 2 to 5 μm is used for general powder metallurgy. In the present invention, 3 to 10 μm is usually preferable, preferably 3 to 5 μm, and most preferably 3.5 μm. Before and after. Further, the tungsten powder-free resin layer is a coating layer and / or a film layer made of, for example, a soft vinyl chloride resin or a urethane resin in which the tungsten powder is omitted from the tungsten powder-filled resin layer. In addition, it is most preferable because of excellent abrasion resistance, but it may be a filler other than tungsten powder, for example, barium sulfate, or a colored layer containing a pigment. When the radiation shielding sheet of the present invention is used for a container bag, a shield cover, a truck bed hood, a floor sheet, a partition sheet, a water shielding sheet, a protective sheet attached to a radiation medical device, etc., the tungsten powder-free resin layer side Bending durability and wear resistance are further improved by making the exposed surface (surface) side.
本発明においてタングステン類粉末充填樹脂層は、タングステン類粉末と熱可塑性樹脂を含む液状組成物（軟質塩化ビニル樹脂ペースト、有機溶剤に溶かしたウレタン樹脂、有機溶剤に溶かした合成ゴム及びエラストマー、ウレタン樹脂エマルジョン、エチレン−酢酸ビニル共重合体エマルジョン、アクリル系樹脂エマルジョンなど）を、表面起毛を有する布地にコーティング、固化することで形成することが出来る。コーティング時に液状組成物の一部は布地に含浸し、かつ起毛布地の起毛部の全表面を濡らすことで、液状組成物を熱処理固化、あるいは乾燥固化させて形成されるタングステン類粉末充填樹脂層には、起毛布地の起毛部の一部が埋没する構造を形成することができる。このようなコーティングにおいて、タングステン類粉末充填樹脂層を表層及び内層に分け、表層：内層の厚さ比を１：１０〜１：５とした時、内層に含有するタングステン類粉末の含有率が表層よりも１．１〜１．５倍大きく、かつ内層内に起毛布地の起毛部の一部が埋没していることが、得られる放射線遮蔽シートの耐屈曲強さ、及び耐摩耗性を維持するための実用的観点において好ましい。このようなタングステン類粉末の含有率傾斜状態は、タングステン類粉末の沈降堆積によって形成されるか、タングステン類粉末の含有率の互いに異なる２種以上のコーティング組成物の併用による複層コーティングによって形成され、特にタングステン類粉末の沈降堆積によって形成される場合、起毛布地の起毛部はタングステン類粉末の沈降堆積によって、より強固にタングステン類粉末充填樹脂層内に取り込まれて埋没する状態を形成する。タングステン類粉末の含有量は５００ｇ／ｍ２以上が必須である。遮蔽性能を高めるためにはより高濃度に遮蔽剤を含有させることが必要となり、５００ｇ／ｍ２以上が好ましく、更に好ましくは８００ｇ／ｍ２以上である。含有量が５００ｇ／ｍ２未満では、放射線の遮蔽効果が激減し、強度の強いガンマ線等の遮蔽効果が発現しなくなる。 In the present invention, the tungsten powder-filled resin layer is a liquid composition containing a tungsten powder and a thermoplastic resin (soft vinyl chloride resin paste, urethane resin dissolved in an organic solvent, synthetic rubber and elastomer dissolved in an organic solvent, urethane resin. (Emulsion, ethylene-vinyl acetate copolymer emulsion, acrylic resin emulsion, etc.) can be formed by coating and solidifying on a fabric having surface raising. Part of the liquid composition during coating is impregnated into the fabric, and the entire surface of the raised portion of the raised fabric is wetted to solidify the liquid composition by heat treatment or dry-solidify the tungsten powder-filled resin layer A structure in which a part of the raised portion of the raised fabric is buried can be formed. In such coating, when the tungsten powder-filled resin layer is divided into a surface layer and an inner layer, and the thickness ratio of the surface layer: the inner layer is 1:10 to 1: 5, the content of the tungsten powder contained in the inner layer is the surface layer. 1.1 to 1.5 times larger than that and part of the raised portion of the raised fabric is buried in the inner layer, maintaining the bending resistance and wear resistance of the resulting radiation shielding sheet This is preferable from a practical viewpoint. Such a tungsten powder content gradient state is formed by sedimentation deposition of tungsten powder or by multi-layer coating using a combination of two or more coating compositions having different tungsten powder contents. In particular, when formed by sedimentation deposition of tungsten powder, the raised portion of the raised fabric forms a state of being more firmly taken into and buried in the tungsten powder-filled resin layer by sedimentation deposition of tungsten powder. The content of tungsten powder is essential to be 500 g / m 2 or more. In order to enhance the shielding performance, it is necessary to contain a shielding agent at a higher concentration, preferably 500 g / m 2 or more, and more preferably 800 g / m 2 or more. When the content is less than 500 g / m 2 , the radiation shielding effect is drastically reduced, and the shielding effect such as strong gamma rays is not exhibited.
本発明においてタングステン類粉末非含有樹脂層は、タングステン類粉末を含まず熱可塑性樹脂を主体として構成されるもの、またはタングステン類以外の粉末、例えば硫酸バリウム、三酸化アンチモン、水酸化アルミニウム、炭酸カルシウムなどと熱可塑性樹脂から構成されるものの何れであってもよい。タングステン類粉末非含有樹脂層は、軟質塩化ビニル樹脂ペースト、有機溶剤に溶かしたウレタン樹脂、有機溶剤に溶かした合成ゴム及びエラストマー、ウレタン樹脂エマルジョン、エチレン−酢酸ビニル共重合体エマルジョン、アクリル系樹脂エマルジョンなどの液状樹脂組成物を、表面起毛を有する布地にコーティング、固化することで形成することが好ましいが、特に熱可塑性樹脂を主体として、他の成分を含まない場合、及び多く含まない場合は、タングステン類粉末非含有樹脂層が形成される布地面に表面起毛が無くてもよい。 In the present invention, the tungsten powder-free resin layer is composed mainly of a thermoplastic resin without containing tungsten powder, or powder other than tungsten, such as barium sulfate, antimony trioxide, aluminum hydroxide, calcium carbonate. Any of those composed of a thermoplastic resin may be used. Tungsten powder-free resin layer consists of soft vinyl chloride resin paste, urethane resin dissolved in organic solvent, synthetic rubber and elastomer dissolved in organic solvent, urethane resin emulsion, ethylene-vinyl acetate copolymer emulsion, acrylic resin emulsion It is preferable to form a liquid resin composition such as coating on a fabric having surface raising and solidifying, especially when mainly containing a thermoplastic resin and not containing other components, The fabric surface on which the tungsten powder-free resin layer is formed may have no surface raising.
以下、本発明について実施例を挙げて具体的に説明するが、本発明はこれらに限定されるものではない。下記実施例及び比較例において、試験サンプルの放射線遮蔽性能評価および耐屈曲性評価は下記の試験方法により測定し、評価した。
［放射線遮蔽性能評価］
公称値１０ＭＢｑのセシウム１３７線源をガンマ線源として、試験サンプルの透過線量より遮蔽率を算出した。（地方独立行政法人東京都立産業技術研究センターにて測定）
［耐屈曲性評価］
ＪＩＳ Ｋ ６４０４−６に準拠した方法でスコット試験機を用いて測定した。１ｋｇ荷重の負荷を掛けて２０００回の屈曲試験を行い、２００回毎にサンプルの状態を観察し以下の判断基準で評価した。
１：基布からのタングステン類粉末充填樹脂層の亀裂や脱落が無く、
サンプル本体にも損傷が見られないレベル
２：タングステン類粉末充填樹脂層の軽微な摩耗、または微細な亀裂を認めるが、
サンプル本体に損傷は見られず実用に問題ないレベル
３：タングステン類粉末充填樹脂層の部分的剥離、または広範囲に亀裂を認め、
実用的耐久性に劣る
４：基布から樹脂層の剥離や脱落が顕著で、実用性に問題がある
EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these. In the following examples and comparative examples, the radiation shielding performance evaluation and the bending resistance evaluation of the test samples were measured and evaluated by the following test methods.
[Evaluation of radiation shielding performance]
Using a cesium 137 source with a nominal value of 10 MBq as a gamma ray source, the shielding rate was calculated from the transmitted dose of the test sample. (Measured at the Tokyo Metropolitan Industrial Technology Research Center)
[Bend resistance evaluation]
It measured using the Scott tester by the method based on JISK6404-6. A bending test was performed 2000 times with a load of 1 kg, and the state of the sample was observed every 200 times and evaluated according to the following criteria.
1: There is no crack or falling off of the tungsten powder-filled resin layer from the base fabric.
Level 2: no damage to the sample body: Minor wear or cracks in the tungsten powder-filled resin layer are observed,
There is no damage to the sample body, and there is no problem in practical use. Level 3: Partial peeling of the tungsten powder-filled resin layer, or cracks in a wide range,
Inferior to practical durability 4: Peeling and dropping of the resin layer from the base fabric is remarkable, and there is a problem in practicality
［実施例１］
繊維性基布として、
ポリエステル紡績糸高密度平織布：
４２２ｄｔｅｘ（１４番手） × ４２２ｄｔｅｘ（１４番手）
６０ × ４６（本／インチ）
を使用した。基布質量は１９０ｇ／ｍ２、カバーファクターは２１７８であった。
基布の一面上に針布による起毛処理を１２０本／ｃｍ２で実施した。
また、起毛処理面にウレタン系樹脂を用いた下記組成のタングステン粉末充填コート液を調製、もう一方の面にはポリ塩化ビニル樹脂を用いた下記組成のタングステン粉末非含有コート液を調整した。
（タングステン粉末充填コート液配合）
タングステン粉末（比重１９．２５） ６０質量部
ウレタン系樹脂 ２７質量部
アクリル系共重合体樹脂 ３質量部
溶剤イソプロピルアルコール ５質量部
配合中のタングステン粉末は６３質量％である。配合を上記基布の片面にクリアランスコートを２回施し、熱処理することでタングステン粉末充填層を形成した。形成された放射線遮蔽シートの総質量は２４１０ｇ／ｍ２であった。そのシート中のタングステン粉末充填層の質量は２２２０ｇ／ｍ２であり、タングステン粉末の含有量は１９３０ｇ／ｍ２（表層：内層の厚さ比を１：５とした時、内層含有率は、表層含有率の１．１５倍のタングステン粉末の含有量）８７質量％であった。
（タングステン粉末非含有コート液配合）
ポリ塩化ビニル樹脂 １００質量部
ＤＯＰ（ジオクチルフタレート、可塑剤） ６０質量部
エポキシ化大豆油 ４質量部
Ｂａ−Ｚｎ系安定剤 ２質量部
上記配合を用いてタングステン粉末充填層の反対面にコートを施し、熱処理することでタングステン粉末非含有層を形成した。形成させた放射線遮蔽シートの総質量は２５１０ｇ／ｍ２であった。得られた放射線遮蔽シートは、起毛処理で生じた毛羽が放射線遮蔽層と立体的に密着することにより耐摩耗性に優れ、１ｋｇ荷重で２０００回の屈曲試験でもタングステン類粉末充填樹脂層の亀裂や脱落は認められなかった。
[Example 1]
As a fibrous base fabric
Polyester spun yarn high density plain woven fabric:
422 dtex (14th) x 422 dtex (14th)
60 x 46 (books / inch)
It was used. The base fabric mass was 190 g / m 2 and the cover factor was 2178.
Brushing with a needle cloth was performed on one surface of the base cloth at 120 / cm 2 .
Further, a tungsten powder-filled coating solution having the following composition using a urethane-based resin was prepared on the brushed surface, and a tungsten powder-free coating solution having the following composition using a polyvinyl chloride resin was prepared on the other surface.
(Contains tungsten powder-filled coating solution)
Tungsten powder (specific gravity 19.25) 60 parts by mass Urethane resin 27 parts by mass Acrylic copolymer resin 3 parts by mass Solvent isopropyl alcohol 5 parts by mass The tungsten powder in the composition is 63% by mass. The blending was performed twice on one side of the base fabric, followed by heat treatment to form a tungsten powder packed layer. The total mass of the formed radiation shielding sheet was 2410 g / m 2 . The mass of the tungsten powder packed layer in the sheet is 2220 g / m 2 , and the content of tungsten powder is 1930 g / m 2 (surface layer: inner layer thickness ratio is 1: 5, the inner layer content is the surface layer Content of tungsten powder 1.15 times the content) was 87% by mass.
(Contains coating solution containing no tungsten powder)
Polyvinyl chloride resin 100 parts by mass DOP (dioctyl phthalate, plasticizer) 60 parts by mass Epoxidized soybean oil 4 parts by mass Ba-Zn-based stabilizer 2 parts by mass A tungsten powder-free layer was formed by heat treatment. The total mass of the formed radiation shielding sheet was 2510 g / m 2 . The obtained radiation shielding sheet is excellent in abrasion resistance because the fluff produced by the raising treatment is three-dimensionally adhered to the radiation shielding layer, and the tungsten powder-filled resin layer has cracks or the like even in a bending test of 2000 times with a 1 kg load. Dropout was not observed.
［実施例２］
実施例１と同様に得られた放射線遮蔽シートのタングステン粉末充填層の反対面に、ウレタン樹脂を用いた下記組成のタングステン粉末非含有コート液を塗工した。
（タングステン粉末非含有コート液配合）
ウレタン系樹脂 ９７質量部
溶剤イソプロピルアルコール ５質量部
得られた放射線遮蔽シートの総質量は２５１０ｇ／ｍ２であった。そのシート中のタングステン粉末充填層の質量は２２２０ｇ／ｍ２であり、タングステン粉末の含有量は１９３０ｇ／ｍ２であり、起毛処理で生じた毛羽が放射線遮蔽層と立体的に密着することにより耐摩耗性に優れ、１ｋｇ荷重で２０００回の屈曲試験でもタングステン類粉末充填樹脂層の亀裂や脱落は認められなかった。
[Example 2]
A tungsten powder-free coating solution having the following composition using a urethane resin was applied to the opposite surface of the tungsten powder-filled layer of the radiation shielding sheet obtained in the same manner as in Example 1.
(Contains coating solution containing no tungsten powder)
Urethane resin 97 parts by mass Solvent isopropyl alcohol 5 parts by mass The total mass of the obtained radiation shielding sheet was 2510 g / m 2 . The mass of the tungsten powder packed layer in the sheet is 2220 g / m 2 , the content of tungsten powder is 1930 g / m 2 , and the fluff generated by the raising treatment is sterically adhered to the radiation shielding layer in a three-dimensional manner. It was excellent in abrasion, and no cracks or dropping off of the tungsten powder-filled resin layer was observed even in a bending test of 2000 times with a 1 kg load.
［比較例１］
実施例１と同様に放射線遮蔽シートを作製した。但し、繊維性基布として、実施例１で使用したポリエステルスパン糸高密度平織布：
４２２ｄｔｅｘ（１４番手） × ４２２ｄｔｅｘ（１４番手）
６０ × ４６（本／インチ）
を使用、起毛処理は省略とした。
このときの放射線遮蔽シートの総質量は２５１０ｇ／ｍ２であった。そのシート中の放射線遮蔽層の質量は２２２０ｇ／ｍ２であり、タングステン類粉末の含有量は１９３０ｇ／ｍ２、８７質量％であったが、起毛処理を省略したことで、タングステン類粉末充填樹脂層がポリエステルスパン糸高密度平織布から脱落し易く、１ｋｇ荷重で２００回の屈曲試験でタングステン類粉末充填樹脂層の部分的剥離、広範囲に亀裂を認め、１ｋｇ荷重で８００回で基布から樹脂層の剥離や脱落が顕著となるなど、実用性を欠くものであった。
[Comparative Example 1]
A radiation shielding sheet was produced in the same manner as in Example 1. However, the polyester spun yarn high density plain woven fabric used in Example 1 as the fibrous base fabric:
422 dtex (14th) x 422 dtex (14th)
60 x 46 (books / inch)
The brushing treatment was omitted.
The total mass of the radiation shielding sheet at this time was 2510 g / m 2 . The mass of the radiation shielding layer in the sheet was 2220 g / m 2 , and the content of tungsten powder was 1930 g / m 2 , 87% by mass. The layer is easy to come off from the polyester spun yarn high-density plain woven fabric. Partial peeling of the tungsten powder-filled resin layer was observed in the bending test 200 times at 1 kg load, and cracks were observed in a wide range. The resin layer lacked practicality, such as exfoliation and falling off of the resin layer.
［比較例２］
実施例１と同様に放射線遮蔽シートを作製した。但し繊維性基布として、
ポリエステルフィラメント糸高密度平織布：
２８０ｄｔｅｘ × ２８０ｄｔｅｘ
２６ × ５０（本／インチ）
を使用した。基布質量は８０ｇ／ｍ２、カバーファクターは１２７２であった。
起毛処理は針布起毛、１２０本／ｃｍ２で実施した。
このときの放射線遮蔽シートの総質量は２３００ｇ／ｍ２であった。そのシート中の放射線遮蔽層の質量は２２２０ｇ／ｍ２であり、タングステン粉末の含有量は１９３０ｇ／ｍ２（表層：内層の厚さ比を１：５とした時、内層含有率は、表層含有率の１．１５倍のタングステン粉末の含有量）、８７質量％であったが、起毛処理を施したにも係わらず、ポリエステルフィラメント糸高密度平織布には短繊維紡績糸を含んでいないことによって、実質的に起毛が形成されなかったことで、タングステン類粉末充填樹脂層がポリエステルフィラメント糸高密度平織布から脱落し易く、１ｋｇ荷重で２００回の屈曲試験でタングステン類粉末充填樹脂層の部分的剥離、広範囲に亀裂を認め、１ｋｇ荷重で４００回で基布から樹脂層の剥離や脱落が顕著となるなど、実用性を欠くものであった。
[Comparative Example 2]
A radiation shielding sheet was produced in the same manner as in Example 1. However, as a fibrous base fabric,
Polyester filament yarn high density plain woven fabric:
280 dtex x 280 dtex
26 x 50 (books / inch)
It was used. The base fabric mass was 80 g / m 2 and the cover factor was 1272.
The raising treatment was carried out with a raised nap, 120 pieces / cm 2 .
The total mass of the radiation shielding sheet at this time was 2300 g / m 2 . The mass of the radiation shielding layer in the sheet is 2220 g / m 2 , and the content of tungsten powder is 1930 g / m 2 (when the surface layer: inner layer thickness ratio is 1: 5, the inner layer content is the surface layer content The content of tungsten powder 1.15 times the ratio) was 87% by mass, but the polyester filament yarn high-density plain woven fabric did not contain staple fiber spun yarns despite the raising treatment. As a result, the tungsten powder-filled resin layer is easily removed from the polyester filament yarn high-density plain woven fabric due to the fact that no raising is substantially formed, and the tungsten powder-filled resin layer is subjected to a bending test of 200 times with a 1 kg load. The resin layer was partially peeled, cracks were observed in a wide range, and the resin layer peeled off or dropped off from the base fabric 400 times at 1 kg load.
以上説明した本実施形態の放射線遮蔽シートであれば、高比重で取り扱い性に難がある鉛等、安価だが放射線遮蔽性能が低く多量添加を必要とする硫酸バリウム等と比べて、タングステンであれば効果的な添加量で放射線遮蔽性能を付与することが可能となる。また、本シートは少なくとも１面上に放射線遮蔽層を付与しており片面はタングステン類粉末非含有樹脂層の耐屈曲性と耐摩耗性を維持しているため、タングステン類粉末非含有樹脂層を露出面とするコンテナバッグ、シールドカバー、トラックの荷台幌、フロアシート、間仕切りシート、遮水シート及び放射線医療機器附帯の防護シートなどは放射線遮蔽作業現場での実用耐久性に格段の信頼性を得ることができる。 If the radiation shielding sheet of the present embodiment described above is lead, such as lead having high specific gravity and difficulty in handling, it is tungsten, compared with barium sulfate etc. which is inexpensive but has low radiation shielding performance and requires a large amount of addition. It becomes possible to impart radiation shielding performance with an effective addition amount. In addition, this sheet has a radiation shielding layer on at least one surface, and one surface maintains the bending resistance and wear resistance of the tungsten powder-free resin layer. Container bags, shield covers, truck bed hoods, floor sheets, partition sheets, water shielding sheets and protective sheets attached to radiological medical equipment, which are exposed surfaces, are remarkably reliable for practical durability at radiation shielding work sites. be able to.
Claims (6)
ただし、カバーファクター（ＣＦ）＝ｘ・ｄ１／２ ＋ｙ・ｄ’１／２
ｘ ：布地の２．５４ｃｍ当たりの経糸本数
ｙ ：布地の２．５４ｃｍ当たりの緯糸本数
ｄ ：経糸のトータル繊度（デシテックス）
ｄ’：緯糸のトータル繊度（デシテックス） The radiation shielding sheet according to claim 1 or 2, wherein a cover factor of the brushed fabric is 1800 to 2400.
However, the cover factor (CF) = x · d 1/2 + y · d ′ 1/2
x: number of warps per 2.54 cm of the fabric y: number of wefts per 2.54 cm of the fabric d: total fineness of the warp (decitex)
d ': Total fineness of the weft (decitex)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7016036B2 (en) | 2017-04-25 | 2022-02-04 | パナソニックＩｐマネジメント株式会社 | Fireproof materials, clothing and building materials |
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| JPH0985864A (en) * | 1995-09-26 | 1997-03-31 | Morita Sangyo Kk | Resin laminated sheet |
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| JP2014035225A (en) * | 2012-08-08 | 2014-02-24 | Hiraoka & Co Ltd | Radiation shield sheet |
| JP2014041040A (en) * | 2012-08-22 | 2014-03-06 | Hiraoka & Co Ltd | Flexible composite sheet |
| JP2015225062A (en) * | 2014-05-30 | 2015-12-14 | 東レ株式会社 | Radiation shielding sheet and radiation shielding member |
| JP2017083367A (en) * | 2015-10-30 | 2017-05-18 | 平岡織染株式会社 | Radiation shield sheet |
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2016
- 2016-06-17 JP JP2016120465A patent/JP2017223601A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0214079A (en) * | 1988-06-27 | 1990-01-18 | Du Pont Toray Co Ltd | Stretchable sueded fabric |
| JPH0985864A (en) * | 1995-09-26 | 1997-03-31 | Morita Sangyo Kk | Resin laminated sheet |
| US20070152197A1 (en) * | 2003-12-05 | 2007-07-05 | Lagace Arthur P | Flexible Polymer Sheet Filled With Heavy Metal Having a Low Total Weight |
| JP2013104785A (en) * | 2011-11-14 | 2013-05-30 | Keiwa Inc | Radiation protective sheet and method for manufacturing radiation protective sheet |
| JP2014035225A (en) * | 2012-08-08 | 2014-02-24 | Hiraoka & Co Ltd | Radiation shield sheet |
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| JP2015225062A (en) * | 2014-05-30 | 2015-12-14 | 東レ株式会社 | Radiation shielding sheet and radiation shielding member |
| JP2017083367A (en) * | 2015-10-30 | 2017-05-18 | 平岡織染株式会社 | Radiation shield sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7016036B2 (en) | 2017-04-25 | 2022-02-04 | パナソニックＩｐマネジメント株式会社 | Fireproof materials, clothing and building materials |
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