[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-323700-105":59,"doc-detail-323700-en":131},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","a-method-of-melt-spinning-of-multifilaments-for-carbon-fiber-patent","A method of melt spinning of multifilaments for carbon fiber - Patent","","A patent describes a method for melt spinning pitch into carbon-fiber multifilaments, targeting a low fluctuation rate in single-filament fineness. The approach extrudes molten pitch using a multi-hole spinneret while maintaining discharge-hole backpressure above 2.0 kg/cm²·G (preferably higher). The disclosure explains prior limits caused by pitch viscosity dependence on temperature and composition, and shows that higher backpressure stabilizes flow among spinneret holes, enabling uniform multifilaments even with spinnerets exceeding 200–500 holes.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/a-method-of-melt-spinning-of-multifilaments-for-carbon-fiber-patent/323700/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/a-method-of-melt-spinning-of-multifilaments-for-carbon-fiber-patent/323700.png","ImageObject",300,407,{"name":92,"@type":93},"Genevieve","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-28","2026-09-21",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",13,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What is the core objective of the invention?","Question",{"text":113,"@type":114},"To produce pitch-based carbon fiber multifilaments with a low fluctuation rate in single-fiber fineness, enabling stable industrial production.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"How does the method address problems specific to pitch spinning?",{"text":118,"@type":114},"It controls discharge-hole backpressure to stabilize flow and reduce fineness fluctuation that arises from pitch viscosity dependence on temperature and uneven viscosity among pitch components.",{"name":120,"@type":111,"acceptedAnswer":121},"What backpressure condition is required in the patent claim?",{"text":122,"@type":114},"Melt spinning of pitch is conducted using a multi-hole spinneret at a discharge hole backpressure exceeding 2.0 kg/cm²·G, with preferable and most preferred higher thresholds also stated.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},323700,1790220114,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":140,"language":141,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":142,"faqs":143,"seo_title":144,"seo_description":67,"update_tm":145,"read_time":146,"preview_page_count":4},1374391974585,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","Matsumoto,Tadayuki.  \nMethod of melt spinning of multifilaments forcarbon fiber /by Tadayuki Matsumoto and others.14 p.  \nPatent(Japanese)No.59-168113(1984).Filed:  TRANSLATION NO.4629.  \n# 12 OFFICIAL GAZETTE FOR UNEXAMINED PATENTS(A)\n\n1l Disclosure Number59~168113-1984  \n51 Int.C1.3  \nIdentificationSymbols  \nD 01 F 6/00  \n//D 01 F 9/14  \n# 43 Date of Provisional Publication\n\nNumber of InventionsRequest for Examination  \n54Method of melt spinning of multifilaments for carbon fiber  \n21 Application Number  \n22 Filing Date  \n72 Inventors  \n71 Applicant  \nIntra-agency File Nos.  \nSeptember 21,1984  \none  \nOtsu-shi,Sonoyama lchome 1-1Toray Ltd.,Shiga office  \nTokyo-to,Chuo-ku,Nipponbashi Muromachi 2chome 2  \n6791-4L  \n7199-4L  \nNot requested(total 8 pages)  \n40765-1983  \nMarch 14,1983  \nTadayuki MatsumotoMitsuhiro ShiokawaTadakazu Endo  \nToray,Ltd.  \nDigitized by the Internet Archivein 2016  \nhttps://archive.org/details/methodofmeltspin00mats  \nSpecifications  \n# 1.Title of Invention\n\nA method of melt spinning of multifilaments for carbonfiber.  \n# 2.Scope of Patent Claim\n\nA method of melt spinning of multifilaments for carbon fiberin which melt spinning of pitch is conducted using a multi-holespinneret at a discharge hole backpressure exceeding 2.0kg/cm²·G.  \n# 3.Detailed Description of the Invention\n\nThis invention concerns a method of melt spinning of pitchfibers with a low rate of fluctuation in singles fineness,especially a method of melt spinning to produce pitch-basedcarbon fiber multifilaments.  \nThe method of extruding molten pitch using a staticspinneret and the method of rotating centrifugal spinning areknown methods of producing carbon fibers through melt spinning ofpitch in the past.  However,attention has only been directed toproblems involving the pitch as the raw spinning solution orproblems involving carbonization or graphitization in suchtechniques,and the relation between the characteristics of thethread subjected to melt spinning and the carbon fibers orgraphite fibers has not been examined yet.  \nSpecifically,problems include  \n(1)the molten viscosity of pitch has a very great  \ndependence on the temperature,and the viscosity changes greatlywith even slight temperature changes.  \n(2)variations in viscosity readily develop since pitch is ablend.  Differences in viscosity develop among opticallyanisotropic fractions in pitch consisting of ingredients withoptical anisotropy,and there is a strong tendency for unevenviscosity to develop.  \n(3)the viscosity is usually very low,only 10~300 poise,atthe temperature of melt spinning of pitch,and the fluctuation inthe singles fineness is great in usual melt spinning,makinguniform yarn difficult to produce.  \nMelt spinning has usually been conducted at the extremelyslow speed of 20 m/min using a single hole spinneret whenproducing carbon fibers from pitch in the past,but such  \ntechniques have been unavoidable in light of the aforementionedproblems involving pitch.  However,the rate of fluctuation inthe singles fineness has been great in such conventional  \ntechniques since no method of reducing the fluctuation in singlesfineness and of making the yarn more uniform has been seen.  Suchfibers readily undergo yarn cutting etc.in procedures followingthe spinning of fiber fractions with low fineness in filaments,but the resistance to melting becomes inadequate and the cross-sectional area becomes great.  Increase in the fineness toprevent yarn cutting leads to decline in strength,but pitch-based carbon fiber has been produced while sacrificing such yarncharacteristics.  \nSuch unevenness in the fineness becomes more serious as thenumber of filaments subjected to melt spinning increases,andmultifilaments of pitch-based fiber have not been produced on thepractical level.  \nThe inventors have conducted thorough research into  \ntechniques of industrial production of multifilaments from pitchin which the unevenness in the fineness is slight in light ofsuch a technical background. ","cbCainnKR6EGgWxl","https://ap.wps.com/l/cbCainnKR6EGgWxl","pdf",793788,32,"English","# 1. Title of Invention\n# 2. Scope of Patent Claim\n# 3. Detailed Description of the Invention","[{\"question\":\"What is the core objective of the invention?\",\"answer\":\"To produce pitch-based carbon fiber multifilaments with a low fluctuation rate in single-fiber fineness, enabling stable industrial production.\"},{\"question\":\"How does the method address problems specific to pitch spinning?\",\"answer\":\"It controls discharge-hole backpressure to stabilize flow and reduce fineness fluctuation that arises from pitch viscosity dependence on temperature and uneven viscosity among pitch components.\"},{\"question\":\"What backpressure condition is required in the patent claim?\",\"answer\":\"Melt spinning of pitch is conducted using a multi-hole spinneret at a discharge hole backpressure exceeding 2.0 kg/cm²·G, with preferable and most preferred higher thresholds also stated.\"}]","A method of melt spinning of multifilaments for carbon fiber - Patent | PDF",1789965919,81]