# US 2021/0172089 A1 · Method for producing thread bundle derived from bagworm silk threads spun on the surface of a base material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0172089 A1 - Document ID: US20210172089A1 - Status: Published application - Kind: A1 - Application number: 17/271,518 - Filed: 2019-08-27 - Published: 2021-06-10 - Earliest claimed: 2018-08-27 - Assignees: National Agriculture and Food Research Organization; Kowa Company, Ltd. - Applicants: National Agriculture and Food Research Organization; Kowa Company, Ltd. - Inventors: Taiyo YOSHIOKA; Tsunenori KAMEDA; Akimune ASANUMA; Norihiko FUKUOKA - Web page: https://patentgrep.com/patent/US20210172089A1 ## CPC - D01C 3/02: De-gumming silk - D01F 4/02: from fibroin - D01F 4/00: Monocomponent artificial filaments or the like of proteins; Manufacture thereof - D04H 1/4266: Natural fibres not provided for in group D04H1/425 - D01B 7/00: Obtaining silk fibres or filaments - D01C: CHEMICAL OR BIOLOGICAL TREATMENT OF NATURAL FILAMENTARY OR FIBROUS MATERIAL TO OBTAIN FILAMENTS OR FIBRES FOR SPINNING; CARBONISING RAGS TO RECOVER ANIMAL FIBRES - D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS - D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B) - D01B: MECHANICAL TREATMENT OF NATURAL FIBROUS OR FILAMENTARY MATERIAL TO OBTAIN FIBRES OF FILAMENTS, e.g. FOR SPINNING (crude extraction of asbestos fibres from ores B03B; apparatus for retting D01C) ## Abstract A bagworm silk thread spun on a base material was conventionally difficult to be collected, and thus, cannot be utilized. An object of the present invention is to develop and provide a method in which such a bagworm silk thread is peeled off from a base material with a weak force without being damaged and is collected as a thread bundle. Provided is a method for producing a thread bundle of a bagworm silk thread, including: applying, to a bagworm silk thread spun on the surface of a base material, a wetting liquid which presents a liquid form at least in the range of 20° C. or more and less than 30° C. and does not damage, denature, or dissolve the silk thread; and then separating the bagworm silk thread from the base material. ## Claims ### Claim 1 A method for producing a thread bundle of a bagworm silk thread, comprising: wetting liquid applying process of applying a wetting liquid to the bagworm silk thread spun on the surface of a base material; and separating the bagworm silk thread from the base material, wherein the wetting liquid is in a liquid form at least in the range of 20° C. or more and less than 30° C. under the atmospheric pressure, and is a pure substance or a mixture that does not damage, denature, or dissolve a fibroin protein which is a fiber component of the bagworm silk thread. ### Claim 2 (depends on 1) The method according to claim 1, further comprising a spinning process of placing a bagworm on the surface of the base material before the wetting liquid applying process and allowing the bagworm to spin the thread. ### Claim 3 (depends on 2) The method according to claim 2, further comprising a bagworm collection process of collecting the bagworm together with a nest after the spinning process and before the wetting liquid applying process. ### Claim 4 (depends on 1) The method according to claim 1, further comprising a washing process of washing the separated bagworm silk thread. ### Claim 5 (depends on 1) The method according to claim 1, further comprising a degumming process of degumming the separated bagworm silk thread. ### Claim 6 (depends on 1) The method according to claim 1, wherein the wetting liquid is a pure substance or a mixture that has a melting point of less than 20° C. and a boiling point of 30° C. or more and 300° C. or less. ### Claim 7 (depends on 1) The method according to claim 1, wherein the wetting liquid is an aqueous solution or an organic solvent. ### Claim 8 A method for collecting a bagworm silk thread spun on the surface of a base material, comprising: applying a wetting liquid to the bagworm silk thread spun on the surface of the base material; and separating the bagworm silk thread from the base material, wherein the wetting liquid is in a liquid form at least in the range of 20° C. or more and less than 30° C. under the atmospheric pressure, and is a pure substance or a mixture that does not damage, denature, or dissolve a fibroin protein which is a fiber component of the bagworm silk thread. ### Claim 9 (depends on 8) The method according to claim 8, wherein the wetting liquid is an aqueous solution or an organic solvent. ### Claim 10 (depends on 1) A bagworm silk thread(s) obtainable by the method according to claim 1. ### Claim 11 (depends on 1) An unwoven fabric formed of a bagworm silk thread(s) obtainable by using the method for producing a thread bundle according to claim 1. ### Claim 12 (depends on 8) A bagworm silk thread(s) obtainable by the method for collecting a bagworm silk thread according to claim 8.