baber/WOPTO huggingface dataset:
Patent KR-102178484-B1 (KR)
Inventor: YOO YEN SOON
IPC: E04B1/61
Filed: 2020-06-01
Granted: 2020-11-13
Abstract: The present invention relates to a fastener for connecting and fixing a partition for the purpose of partitioning or blocking an indoor space, or introducing a path. More specifically, provided is the fastener inserted into a fastening hole formed in the vertical bars of partitions adjacent to each other. The fastener comprises: an eccentric lever formed on one side of a fastening body; rotary holding members coupled to upper and lower parts of the other side of the fastening body; and an inclined interference member which is coupled and formed on an operating rod connected to the eccentric lever to be inserted between the rotary holding members and makes surface contact with the rotary holding members. Therefore, the fastener can strongly and stably couple and fix the partitions adjacent to each other only with a single fastener, can be simply operated and can have a simple fastening structure, thereby being very conveniently used, can prevent a gap between the partitions connected and fixed to each other, thereby achieving an improved fastening state between the partitions and representing beautiful partition walls using the partitions due to removal of the gap, and can connect and fix the partitions in various directions by using separate corner connection bars, thereby being very efficient.
Patent KR-102182099-B1 (KR)
Inventor: AHN HYE SIL
IPC: B01D15/22
Filed: 2020-06-17
Granted: 2020-11-23
Abstract: The present invention relates to a column for purification of a gas chromatography analysis sample and to a method for purifying a gas chromatography analysis sample using the same. More specifically, provided are the column for purification of a gas chromatography analysis sample including a detachable column body portion (100) and a valve (200) connected to the color body portion (100) to be rotatable, and the method for purifying a gas chromatography analysis sample using the same.
Patent KR-102420274-B1 (KR)
IPC: E05D11/00
Filed: 2020-06-25
Granted: 2022-07-13
Abstract: 이중 방수판을 갖는 플로어힌지 유닛 및 그 시공방법에 관한 것으로서, 이중 방수판을 갖는 플로어힌지 유닛은, 도어의 하부에 형성된 힌지축구멍에 결합되는 힌지축이 상부로 돌출된 플로어힌지 본체와 상기 플로어힌지 본체를 구성하는 힌지축을 도어의 하부에 형성된 힌지축구멍에 설치하기 위하여 건물의 출입구 바닥에 매립하는 박스와 상기 박스를 밀폐하는 덮개로 구성된다. 상기 박스와 덮개 사이 그리고, 힌지축의 주변을 밀폐하기 위한 힌지축 밀폐판을 포함하여 박스 전체를 밀폐하기 위한 방수판으로 구성되며, 본 발명에 의하면, 박스 전체를 밀폐하기 위한 방수판과 힌지축 밀폐판을 이중으로 적층시켜 힌지축 주변은 물론이고 박스 전체를 밀폐하여 박스 내부에 플로어힌지 본체로 물이 유입되는 것을 완벽하게 차단할 수 있는 장점과, 도어의 장기 사용에 의해서 플로어힌지 본체의 위치를 조정할 때에도 덮개를 열고 방수판을 움직여서 조정을 한 후에 다시 덮개를 덮어도 방수판과 힌지축 밀폐판이 분리되지 않기 때문에 방수기능이 완벽하게 유지되는 장점이 있다.
Patent KR-102319449-B1 (KR)
Title: Substrate drying apparatus
IPC: H01L21/67
Filed: 2020-06-25
Granted: 2021-11-01
Abstract: The present invention relates to a substrate drying apparatus. The substrate drying apparatus according to the present invention includes: a substrate drying chamber that include an upper housing, a lower housing operably coupled to the upper housing, a substrate arrangement plate coupled to the bottom surface of the lower housing and on which a substrate on which an organic solvent is formed is disposed, an integrated supply/discharge port formed extending from one side of the lower housing to the other side and formed so as to face the substrate arrangement plate in the middle region between the one side and the other side, so as to provide a supply path of the supercritical fluid for initial pressurization and a discharge path of the mixed fluid in which the organic solvent formed on the substrate is dissolved, and an upper supply port formed to face the substrate arrangement plate in the central region of the upper housing to provide a supply path of the supercritical fluid for drying; a flexible supply pipe coupled to one side of the lower housing to provide a path through which the supercritical fluid for initial pressurization is supplied to the substrate drying chamber and having a spiral coil shape; and a flexible discharge pipe coupled to the other side of the lower housing to provide a path through which the mixed fluid is discharged from the chamber and has the spiral coil shape. According to the present invention, it prevents the problem of fluid leakage due to damage to the metallic pipe connected to the lower housing caused by repeated lifting and lowering operations of the lower housing performed to open and close the chamber in the substrate drying process using the supercritical fluid, and it prevents fluid heat loss through piping, so that the supercritical drying efficiency is increased.
Patent KR-102187850-B1 (KR)
Title: Windows system with a duct device
Inventor: LIM TAE SUB
IPC: E06B7/082
Filed: 2020-06-30
Granted: 2020-12-11
Abstract: The present invention relates to a window system with a natural circulation-type ventilation apparatus, which comprises: a pair of left frame and right frame (10) formed in a hollow square frame shape; a lower frame (20) connected to a lower side of the left frame and the right frame (10); an upper frame (30) connected to an upper side of the left frame and the right frame (10); driving apparatuses (40) placed in the left frame and the right frame (10) to be driven by being connected to the lower frame (20) and the upper frame (30) by a lever; and an air flow unit (50) which guides the flow of outdoor air through a left upper blocking member and a right upper blocking member (51) and a separator plate (52), which are placed in the left frame and the right frame (10), and a lower blocking member (53) placed in the lower frame (20). According to the present invention, the window system with a natural circulation-type ventilation apparatus allows the indoor and outdoor air circulation to be conducted by a natural circulation type through the upper and lower window frames by a simple operation, to prevent the outdoor air from being directly introduced indoors, to provide insulation effects and energy-saving effects for cooling and heating, and to remarkably reduce the introduced fine dust, yellow dust, hazardous gas, etc. by a filter.
Patent KR-102148523-B1 (KR)
Title: Frame structure for solar panel installation
Inventor: PARK KWAONG SOO
IPC: H02S20/30
Filed: 2020-07-06
Granted: 2020-08-26
Abstract: One aspect of the present invention stably supports a solar panel so that electricity can be stably generated using sunlight, which is infinite energy. The present invention relates to a solar power generation system implemented to stably generate electricity using solar light, which is infinite energy, wherein the system includes a solar power generation unit which generates electricity using a solar panel.
Patent KR-102419516-B1 (KR)
IPC: A45F3/04
Filed: 2020-07-08
Granted: 2022-07-11
Abstract: 줄 길이 조절구가 개시된다. 본 발명의 줄 길이 조절구는, 복수의 체결홀이 마련된 베이스 바디; 베이스 바디의 내부에 마련되는 탄성체; 및 탄성체의 상면부에 저면부가 지지되며 복수의 체결홀을 통해 줄 부재가 통과되도록 복수의 절개홀이 마련되고 탄성체의 탄성력에 의해 줄 부재를 베이스 바디에 고정시키는 스토퍼부를 포함하고, 탄성체는 외벽이 베이스 바디의 내벽에 접촉되어 스토퍼부를 탄성 지지하고, 복수의 체결홀과 복수의 절개홀은 동일 선상에 마련되는 것을 특징으로 한다.
Patent KR-102305087-B1 (KR)
Title: Pressure tester with improved operating performance of heavy cover, and opening and closing method for heavy cover
Inventor: RYU JE DOO
IPC: G01M3/02
Filed: 2020-07-09
Granted: 2021-09-27
Abstract: The present invention facilitates rapid opening and closing operation of a heavy cover covering a test container for a pressure tester to test an apparatus installed or used under water. The present invention comprises: a test container which has a first flange unit on the top circumference; a heavy cover which has a second flange unit formed along the outer circumference to adhere to the first flange unit; a rotational shaft installed on one side of the top of the test container; and a clamping unit having a first coupling arm and a second coupling arm which are axially coupled with the rotational shaft and make the first flange unit and the second flange unit adhere to each other or release the adhered status.
Patent KR-102222748-B1 (KR)
Title: a golf exercising divot mat
Inventor: YOO CHEOL HO
IPC: A63B69/36
Filed: 2020-07-20
Granted: 2021-03-04
Abstract: The present invention relates to an artificial turf mat used for golf practice. More specifically, the present invention relates to a divot mat for golf exercise in which a divot generated during a swing of striking a golf ball on natural turf is implement in an artificial turf mat. The present invention comprises a main body (110), and an artificial turf part (120), wherein a plurality of artificial turf (121) are formed by gathering together. The present invention has an effect of remarkably increasing the hitting practice efficiency of the golf practice by enabling a golf practitioner to better recognize the divot formed on the artificial turf.
Patent KR-102179860-B1 (KR)
Inventor: CHOI EUN SEONG
IPC: A47J37/04
Filed: 2020-07-21
Granted: 2020-11-17
Abstract: The present invention relates to an automatic reversing oven cooker having a reciprocating rotating bar in a semi-cylindrical U-shaped pot. The automatic reversing oven cooker having a reciprocating rotating bar in a semi-cylindrical U-shaped pot comprises: an upper open semi-cylindrical pot (10); a reciprocating rotation bar (40); an adjuster (50); and a glass lid (60). According to the present invention, a semi-cylindrical pot can be supported by integrally coupling a plate body to the outer bottom surface of the semi-cylindrical pot.
Patent KR-102297691-B1 (KR)
Title: air-quality measurement device of digital clock-integrated type for presenting indoor-to-outdoor air-quality comparative analysis by use of open data server
Inventor: KIM IN KI
IPC: G04G21/04
Filed: 2020-08-11
Granted: 2021-09-03
Abstract: The present invention relates to a digital watch integrated-air quality measurement device based on comparative analysis and display of indoor and outdoor air quality using public data server, which is a technic that compares and analyses the indoor air quality of a place where a user wants to know the air quality such as the user's residence and the most recent actual outdoor air quality for that place from the outside, so as to practically determine and control whether the window of the space in which the user lives is opened or closed and whether various IoT devices are operated to improve the air quality installed in the room. By implementing an air quality measurement device with an air quality measuring technology to a digital watch installed indoors, a luminous color in an hour hand and minute hand of the digital clock is adjusted in response to the indoor air quality of the residence and the outdoor air quality around the residence, and this helps residents to intuitively judge the indoor/outdoor air quality around the residence and helps determine whether ventilation of indoor and outdoor air is appropriate or whether it is appropriate to operate an air quality improvement device installed indoors. According to the present invention, as a gas meter reading data transmission/reception member is provided, the gas meter reading data transmission/reception member serves as a gateway to receive a meter reading measurement value from a nearby gas meter reader and provide the same to an external gas management server.
Patent KR-102227653-B1 (KR)
Title: Polyethylene composition with excellent pressure and scratch resistance and high elasticity polyethylene folded pipe for repair of non-excavated pipes using the same
Inventor: LEE GUK NO
IPC: F16L55/18
Filed: 2020-08-12
Granted: 2021-03-16
Abstract: The present invention relates to a polyethylene composition with excellent pressure and scratch resistances, and a high-elasticity polyethylene foldable pipe for repairing a non-excavated pipe by using the polyethylene composition. The present invention provides the polyethylene composition with excellent pressure and scratch resistances, wherein with respect to 100 parts by weight of polyethylene (PE), a rigid nucleating agent is used to maximize rigidity, a nucleating agent including a metal salt-based nucleating agent that induces β crystals is included, a primary antioxidant is included, and 0.02 to 0.8 parts by weight of a secondary antioxidant and an external lubricant and 0.2 to 0.8 parts by weight of an internal lubricant are included.
Patent KR-102182260-B1 (KR)
Inventor: PARK YOUNG JIN
IPC: B23K9/32
Filed: 2020-08-13
Granted: 2020-11-24
Abstract: The present invention relates to an apparatus for welding a pressure vessel. According to the present invention, the apparatus for welding a pressure vessel comprises: a vertical support part (110) installed vertically to the ground; a lifting body (120); a horizontal support part (130); a lifting part (140); a horizontal transfer part (150); a welding part (160) installed at one end of the horizontal support part (130); a seating part (170); a control part (180); and a base material support part (190). According to the present invention, welding can be performed in a convenient manner.
Patent KR-102334722-B1 (KR)
Title: Ventilation system with control of each room
Inventor: KIM MIN KYU
IPC: F24F11/00
Filed: 2020-08-26
Granted: 2021-12-06
Abstract: The present invention relates to a ventilation system with the control of each room. A total heat exchanger makes outdoor air introduced from outdoors through a purifier exchange heat with indoor air discharged from the indoors, and conducts a ventilation mode for discharging the indoor air to the outdoors and supplying the fresh outdoor air into the indoors, and a recirculation mode for purifying the indoor air and re-supplying the indoor air into the indoors. Multi-step electric diffusers are connected to the total heat exchanger in each room, and ventilate the air by supplying and discharging air, and varies the air volume by multiple steps. A range hood ventilates the air in multiple steps in the kitchen. A line diffuser is connected to the total heat exchanger in the kitchen, and supplies the air. A system controller controls the total heat exchanger, the multi-step electric diffusers, the range hood, and the line diffuser based on the information measured by carbon dioxide sensors and fine dust sensors and the information on the operation or non-operation of a heating cooking table. The present invention aims to provide a ventilation system which is capable of improving ventilation efficiency.
Patent KR-102211456-B1 (KR)
Title: Intelligent system of distribution line
Inventor: HAN AE YOUNG
IPC: G01R31/58
Filed: 2020-08-27
Granted: 2021-02-04
Abstract: The present invention relates to an intelligent management system for distribution lines. More specifically, the present invention relates to the intelligent management system for distribution lines wherein currents and voltages of the distribution line are always measured, and failure information is transmitted to a receiving device or an intermediate information collector in the central control room when an overcurrent is energized on the distribution line due to a cause such as a failure or the like. In the intelligent management system for distribution lines, the case comprising first and second cases can be smoothly opened and closed, and can be easily attached to and detached from the distribution line.
Patent KR-102323493-B1 (KR)
Title: 체액 성분 분리 장치
IPC: A61M1/02
Filed: 2020-08-27
Granted: 2021-11-09
Abstract: 일 실시예에 따른 체액 성분 분리 장치는, 하우징; 상기 하우징을 제1공간 및 제2공간으로 분리하고, 상기 제1공간 및 상기 제2공간을 유체 연결하는 피스톤; 및 상기 피스톤에 작동 가능하게 결합되고, 상기 제1공간 및 상기 제2공간 사이의 압력 평형을 유지시키면서, 상기 제1공간이 제1용적을 갖는 제1위치 및 상기 제1공간이 상기 제1용적과 다른 제2용적을 갖는 제2위치 사이에서 상기 피스톤의 이동을 조절하고, 상기 제1위치 및 상기 제2위치 사이의 임의의 위치에 상기 피스톤을 고정시키도록 구성된 매니퓰레이터를 포함할 수 있다.
Patent KR-102266055-B1 (KR)
Title: Elastic support of distribution lines on power distribution poles
Inventor: Song shang ho
IPC: H02G7/02
Filed: 2020-08-27
Granted: 2021-06-17
Abstract: The present invention relates to an elastic support arm of a distribution wire of an electric pole for distribution, which greatly reduces the working time and construction costs, comprising: a fixing band to which a fastener is fixed by welding; a C-shaped expandable spring plate formed with a spring body; an insulator formed with a fixed shaft; and upper and lower tensioners, respectively formed with upper and lower springs.
Patent KR-102424071-B1 (KR)
Title: 환기 시스템 및 그 제어방법
IPC: F24F13/20
Filed: 2020-09-04
Granted: 2022-07-22
Abstract: 본 발명은 환기 시스템 및 그 제어방법에 관한 것으로, 본 발명의 실시예에 따른 환기 시스템은 수증기 분압의 차이를 이용해, 실외에서 공급되는 외기와 실내에서 배출되는 실내 배기 사이에 수분을 교환시켜, 외기의 습도를 조절하는 조습모듈(10), 조습모듈(10)을 통과한 외기와, 조습모듈(10)로 유입되기 전의 실내 배기 사이에 열을 교환시켜, 외기의 온도를 조절하는 현열 교환기(20), 외기를 조습모듈(10)로 안내하는 제1 외기 통로(31), 조습모듈(10)을 통과한 외기를 현열 교환기(20)로 안내하는 제2 외기 통로(33), 및 현열 교환기(20)를 통과한 외기를 실내로 안내하는 제3 외기 통로(35)를 포함하는 외기 통로부(30), 및 실내 배기를 현열 교환기(20)로 안내하는 제1 실내 배기 통로(41), 현열 교환기(20)를 통과한 실내 배기를 조습모듈(10)로 안내하는 제2 실내 배기 통로(43), 및 조습모듈(10)을 통과한 실내 배기를 실외로 안내하는 제3 실내 배기 통로(45)를 포함하는 실내 배기 통로부(40)를 포함한다.
Patent KR-102261665-B1 (KR)
Title: Apparatus for automatic navigation, method for automatic navigation and midget submarine using the same
Inventor: KWAK SEUNG CHUL
IPC: G06K9/62
Filed: 2020-09-08
Granted: 2021-06-07
Abstract: The present invention is a device for identifying information on a floating target, and relates to an automatic search apparatus, an automatic search method, and a submarine having the same, comprising: an information acquisition unit for acquiring information on the sea level; a target identification unit that pre-learns about the floating target based on artificial intelligence, detects the floating target using the learned information, and identifies peer information of the detected floating target; and an information sharing unit using the information identified by the target identification unit and sharing location information on the floating target to other users who did not identify the floating target.
Patent KR-102256365-B1 (KR)
Inventor: LEE JONG HWAN
IPC: C02F1/40
Filed: 2020-09-15
Granted: 2021-05-27
Abstract: The present invention relates to a skimmer apparatus using a two-chain system of a flotation bath for wastewater treatment. A skimmer installed in the upper portion of a treatment tank main body (100) and dropping floating sludge into a back sludge collection tank (120) has a two-chain system of: a front skimmer (200a) where multiple circulation scrapers (220) of a chain portion (210) pushes sludge floating in the upper portion of the treatment tank main body (100) to the back of the treatment tank main body (100); and a back skimmer (200b) installed next to the front skimmer (200a) and where the circulation scraper (220) drops the floating sludge pushed back by the front skimmer (200a) into the sludge collection tank (120). In the front skimmer (200a) and the back skimmer (200b) of the two-chain system, multiple filtration holes (221) are provided in the scraper (220). Accordingly, floating sludge can be filtered out efficiently. In addition, a malfunctioning skimmer part can be repaired with ease and the rate of operation can be increased.
Patent KR-102214306-B1 (KR)
IPC: H01L21/687
Filed: 2020-10-05
Granted: 2021-02-10
Abstract: 대면적 기판에 대한 안정적인 핸들링 목적으로 종래의 클램핑 유닛을 개선하였다. 즉, 본 발명은 절곡 공정을 적용하기 때문에 정밀하게 제작할 수 없는 구조의 클램퍼 플레이트를 절곡없이 제작하도록 개선하여 정밀도를 확보함으로써 기판의 파손에 대한 위험성을 낮추었고, 클램퍼 자석 및 본체 자석의 배치를 최적화 하여 클램핑 포스를 최대로 이끌어내 대면적 기판이 점착제에서 탈락하는 경우에도 안정적으로 지지 및 고정할 수 있도록 하였다. 클램퍼와 본체의 자석의 외벽은 스톱퍼 역할을 겸하며, 정확한 위치에서 클램핑 될 수 있도록 하는 역할을 한다. 
클램핑 유닛의 클램퍼 플레이트는 구동 푸셔와 맞닿는 부분으로 경도가 높은 열처리된 금속 재질을 사용하고 추가적인 코팅을 활용하여 파티클 발생을 억제 하였다. 구동 푸셔는 두 가지 타입으로 필요에 따라 적용하며 첫 번째 타입은 경사면을 적용하여 일정 높이 이하로 클램프 유닛을 가압할 수 없는 구조를 적용하였도,갈림 및 긁힘 등에 대한 내구성 확보를 위해 열처리 한 금속을 사용하고 코팅을 활용하여 파티클 발생을 억제하였다. 두 번째 타입은 갈림 및 긁힘 등에 대한 내구성 확보를 위해 베어링을 사용하며, 역시 코팅을 활용하여 파티클 발생을 억제하였다.  
또한, 클램프 유닛에 적용되는 볼트는 모두 척에 클램프 유닛을 취부한 상태로 정비/점검 할 수 있도록 하여 클램퍼 플레이트는 취부한 상태로 교체 가능하도록 하여 정비 및 점검의 용이성을 향상시키도록 하였다.
Patent KR-102243030-B1 (KR)
Title: Device Of Abnormality Detection And Blocking For Low Voltage Power And Method Of Driving The Same
Inventor: SO BYUNG SOO
IPC: H02H3/16
Filed: 2020-10-07
Granted: 2021-04-27
Abstract: An apparatus for detecting and blocking abnormality of low voltage power according to various embodiments of the present invention comprises: a power blocking means; a first power source unit connected to the power blocking means to supply an alternate current power source; a second power source unit connected to the power blocking means to supply a direct current power source; a plurality of voltage signal detecting sensors generating voltage signals for determining a normal arc and a harmful arc; a plurality of current signal detecting sensors detecting current signals; a short circuit signal detecting sensor detecting a short circuit signal; and a micro processor unit (MPU) analyzing the voltage signals from the plurality of voltage signal detecting sensors, the current signals from the plurality of current signal detecting sensors and the short circuit signal from the short circuit signal detecting sensor to control blocking of the first power source unit and the second power source unit. The present invention can prevent a sudden failure, a wide area power failure and an electrical fire in a substation due to a defect of a control board.
Patent KR-102479327-B1 (KR)
IPC: G01K13/02
Filed: 2020-10-08
Granted: 2022-12-19
Abstract: 세포 온도 측정 장치 및 방법이 개시된다. 본 개시의 일 실시 예에 따른 세포 온도 측정 장치는, 복수의 말단부를 포함하고, 이상 홀 효과(Anomalous Hall Effect, AHE) 특성을 갖는 홀 소자와, 말단부 중 한 쌍의 제 1 말단부에 전기적으로 연결되어 홀 소자에 전류를 인가하는 전류 인가부와, 홀 소자에 인가된 전류 방향과 수직한 방향으로 외부 자기장을 인가하는 자기장 인가부와, 말단부 중 한 쌍의 제 2 말단부에 연결되어 홀 소자의 홀 전압을 측정하는 신호 분석부와, 홀 전압과 온도의 관계 특성을 포함하는 온도 테이블, 홀 소자에 인가된 전류 및 외부 자기장에 기초하여 홀 소자와 직접적 또는 간접적으로 열전도 연결된 대상체의 온도를 산출하는 제어부를 포함할 수 있다.
Patent KR-102366855-B1 (KR)
Inventor: BAEK SANG MIN
IPC: H01Q1/12
Filed: 2020-10-08
Granted: 2022-02-22
Abstract: An apparatus for inspecting a radar absorbing structure comprises: a table including a first layer and a second layer located on the first layer; an electromagnetic wave absorber disposed on the first layer; an inspection target supporter disposed on the second layer and extended in a first direction to support a radar absorbing structure component; a pair of linear rails extended in a second direction along both edges of the table on the second layer; a semicircle-shaped circular rail in which both ends are fastened to each of the pair of linear rails to be movable along the linear rails in the second direction; and a phase array antenna fastened to the circular rail to be movable along the circular rail.
Patent KR-102284702-B1 (KR)
Title: Apparatus for Surface vehicle and method for spaying coolant
Inventor: MOON HYUN WOO
IPC: B05B12/12
Filed: 2020-10-12
Granted: 2021-08-02
Abstract: The present invention relates to a surface vehicle and a coolant injection method, comprising: a body part having an accommodating space, and provided with a chimney communicating with the accommodating space and extending up and down; a support part installed on the chimney and extending along the perimeter of the chimney; an antenna installed on the support part to transmit and receive signals; and a cooling part installed on the support part and disposed between the antenna and the chimney so as to spray a coolant toward the chimney.
Patent KR-102270888-B1 (KR)
Title: High funtional fiber having linoleic acids and manufacturing method thereof.
Inventor: TAK BYUNG HWAN
IPC: D01F1/10
Filed: 2020-10-15
Granted: 2021-07-01
Abstract: In a high-functional fiber of the present invention, a core part in which 0.7 to 2.5 wt% of a functional material is contained in which a ratio of vegetable oil having 70 wt% or more of the content of volcanic ash : linolenic acid, and less than 5 wt% of low molecular weight volatile substances with boiling points in the range of 120 to 220 is contained 70 to 90 : 10 to 30 in a weight ratio, and a sheath part in which 0.7 to 2.5 wt% of a functional material is contained in which a ratio of vegetable oil having 70 wt% or more of the content of volcanic ash : linolenic acid, and less than 5 wt% of low molecular weight volatile substances with boiling points in the range of 120 to 220 is contained 5 to 20 : 80 to 95 in a weight ratio.