baber/WOPTO huggingface dataset:
Patent KR-20000015801-A (KR)
Title: Method for forming a carbon film
Inventor: JOHNSON SCOTT V
IPC: C01B31/02
Filed: 1998-01-26
Abstract: PURPOSE: A method is provided for forming a carbon film by vacuum arc scheme. CONSTITUTION: The method can form a carbon film having low concentration of macro particles with the improved deposition rate, by using a switching circuit pulsing high current of high frequency and providing arc current signal having a shorter rise time. That is, the method comprises the steps of providing graphite source (115) within a vacuum arc deposition apparatus (100); forming arc (122) between the graphite source (115) and a cathode (122) of the apparatus; and pulsing the arc (122) for defining arc signal (120) having pulse width within a range of 0.25-100 microseconds and within a range of 10-50% of the period of the pulsed arc signal (120). The method also includes pulsing a current signal (119) within a range of 100-300 amperes from an arc power supply (116), wherein the current signal (119) is pulsed at a power MOSFET switching circuit (200) to provide a pulsed arc signal (120) having a rise time within a range of 5-20 nanoseconds.
Patent KR-20000016130-A (KR)
Title: Short-term heat-sealing of anodized metal surfaces with surfactant-containing solutions
Inventor: KOIRNER TORSTEN
IPC: C25D11/24
Filed: 1997-05-22
Abstract: PURPOSE: An improved method is provided to post-seal for improving an anodized porous coat being generated electric-chemically. CONSTITUTION: Described is a method of sealing anodized metal surfaces, the method being characterized in that the anodized metal is brought in contact, for a length of time between 0.5 and 2 minutes per micrometer of anodized-layer thickness, with an aqueous solution having a temperature between 75°C and the boiling point and a pH in the range 5.5 to 8.5 and containing:a) a total of 0.0004 to 0.05 g/l of one or more cationic, anionic or non-ionic surfactants; and b) a total of 0.0005 to 0.5 g/l of one or more organic acids selected from the group comprising the cyclic polycarboxylic acids with 3 to 6 carboxyl groups and the phosphonic acids. The preferred surfactants are non-ionic surfactants and the preferred acids are polyphosphinocarboxylic acids. Optionally present are alkali-metal and/or alkaline-earth metal cations, preferably Li and/or Mg ions, in amounts of 0.0001 to 5 g/l.
Patent KR-19990045837-A (KR)
Filed: 1999-01-23
Abstract: 본 발명품은 SBR반응조에 생폐수를 투입시 조내의 활성오니가 파괴되지않고 정숙하게 조의 바닥으로부터 유입시키기 위한 정류판과 조내를 무산소상태에서 교반을 하기위해 정류판을 이용 교반을 시키기위한 장치이다. SBR은 하나의 반응조에서 폭기, 침전, 방류의 기능을 수행할수 있어 기존의 수처리 방식의 1, 2차 침전조가 필요 없으며 아울러 반송스러지를 보내지 않으면서도 BOD의 제거는 물론 질소 및 인의 제거에도 탁월한 효과가 있어 환경선진국에서는 널리 사용되고 있는 공법이다. SBR에서는 반송스러지가 없는 반면 조내에 활성스러지가 항시 적당량이 유지되고, 이 활성스러지에 생폐수를 유입한후 혼합- 폭기- 무산소상태- 혼합- 폭기- 침전- 방류 등의과정를 순차적으로 실행 시킴으로서 생폐수중의 오염물질인 BOD, SS, 질소, 인 등을 제거 시키고 있다. 그러나 생폐수를 유입시 폐수를 활성스러지 상부로 급격히, 또는 낙차를 두어 유입시킴으로서 활성스러지에 함유되어 있는 미생물이 파괴되어 사멸되는 예가 있어 이를 다시금 적당한 조건으로 만들기 위해서는 시간과 정성이 요구 되게되어 어려움이 많았다. 
     따라서 초기 생폐수를 유입시 기존의 스러지에 충격이 없이 적절히 혼합이 되도록 하는 필수적이다. 
     또한 질소제거를 위하여는 암모니아 또는 아질산을 질산화로 한후 무산소 상태에서 탈질화의 과정을 거쳐야 하는데 이때 무산소 상태의 반응조내를 적절히 교반함으로서 탈질화가 이루어 지게 된다. 또한 생물학적으로 인을 제거하기 위하여 는 혐기성상태에서 무산소 분위기를 거쳐 호기성상태로 만들어 주어야 하는데 이때 또한 정숙한 상태의 교반이 필요하게 된다. 본 발명품의 목적은 SBR반응조내에서 생폐수가 바닥으로부터 각 방향으로 정류가되고 정숙하게 조의 아래부분으로부터 혼합이 이루어 지도록 유도를 하고 질산화된 질소물질을 적절히 교반을 함으로서 탈질화를 이루도록 함과 동시에 생물학적인 탈인이 이루어 질수 있는 분위기을 만들 수 있는 장치를 발명함에 있다. 
     즉 생폐수는 유입구(1)를 통하여 유입된후 1, 2차안내관을 통과하면서 유 속의 흐름이 느려지게 되고, 이러한 폐수가 정류판을 통과함으로서 조의 각 부분으로 균등 분배함과 동시에 속도 는 더한층 느려지게 되어 정숙하게 유입이 되도록 유도를 함한다. 다음으로 무산소 상태의 교반을 위해 정류판을 교반기로 이용 조의 바닥으로부터 교반효과를 얻도록 한 것이다.
Patent KR-20000051970-A (KR)
Title: Auto guided vehicle system
Inventor: KIM DONG WON
IPC: B65G43/00
Filed: 1999-01-28
Abstract: PURPOSE: An auto guided vehicle system is provided to prevent the vehicle system from being dislocated while installing a location detecting member for determining the location of the vehicle system at a ceiling of production line. CONSTITUTION: An auto guided vehicle system comprises an auto guide vehicle(250), a caster (254)installed under the vehicle(250) so as to move along the bottom surface of the production line, a caster driving unit for driving the caster(254), and a control unit for controlling the caster driving unit so that the caster moves along the designated path, the system further comprises a location detecting member(256b) installed at a portion separated by a predetermined height from the bottom of the production line, and an auto guide vehicle location detecting unit(256) having a transmitter(256e) installed at the vehicle(250) and which transmits a detection signal to the location detecting member(256b), and a receiver(256f) for receiving the detected signal reflected from the location detecting member(256b).
Patent KR-19990072384-A (KR)
Title: 압출성형용폴리우레탄수지조성물
IPC: C08G18/10
Filed: 1999-02-03
Abstract: 본 발명은 용융시의 겔화가 적고, 용융 압출 성형기에 의한 장기 연속 성형이 가능하며, 또한 여러가지 물성이 우수한 압출 성형물을 제공하는 폴리우레탄 수지 조성물에 관한 것이다. 
     상기 폴리우레탄 수지 조성물은 구체적으로, 3-메틸-1,5-펜틸렌 아지페이트(A), 폴리테트라메틸렌에테르글리콜(B) 및 1,4-부탄디올(C)로 이루어진 폴리히드록시 성분과 4,4'-디페닐메탄디이소시아네이트(D)를 반응시켜서 얻어지는 것으로, 190℃에서의 특정 유동값, 특정의 10% DMF 용액 점도를 갖는 열가소성 폴리우레탄 탄성 중합체(E)와, 이소시아네이트 말단 화합물(F)을 특정 비율로 배합하여 제조된 것이다.
Patent KR-20000034806-A (KR)
Title: Integrated circuit fabrication
Inventor: BITTING DONALD STEPHEN
IPC: H01L21/00
Filed: 1999-03-02
Abstract: PURPOSE: An integrated circuit fabrication is provided to solve the problem of the conventional plasma etching apparatus that liberated oxygen degrades etching uniformity across the wafer. CONSTITUTION: A method of fabricating an integrated circuit includes the steps of surrounding the wafer with a shadow ring, prior to placing a wafer in the vicinity of a plasma for etching. The shadow ring having at least an upper surface which is incapable of liberating sufficient oxygen to significantly alter the plasma's etching properties. Polyimide is suitable for covering the upper surface of the shadow ring.
Patent KR-20000056932-A (KR)
Inventor: KWON SAM DEUK
IPC: A61N5/06
Filed: 1999-02-23
Abstract: PURPOSE: A spirit-supplying device is designed to supply energy or vitality and absorb or neutralize the bad spirits by mixing the minerals such as Kaolin, talc, activated white clay, diatomite, bentonite which generates spirits such as far-infrared rays or anions. CONSTITUTION: A spirit-supplying device is produced by meshing the minerals such as Kaolin, talc, activated white clay, diatomite, bentonite into fine particles and mixing in the same ratio; adding plant adhesives and spraying on the surface of sheets in the 2-10mm thickness to make it possible to put on body. The device can be adapted to the parts of clothes, socks, gloves, hats, mats, shoes or cushions.
Patent KR-20000012167-A (KR)
Inventor: JEONG DAE WON
IPC: C07J75/00
Filed: 1999-03-04
Abstract: PURPOSE: A phytosterol substituents is prepared by combining a phytosterol with a macromolecular polymer. CONSTITUTION: Phytosterol and succinic anhydride in the mole ratio of 1:1.0- 1:1.3 are reacted in a nonpolar solvent such as toluene, methylene chloride, tetrahydrofuran, benzene or diethyl ether in the presence of alkali catalysts such as 4-dimethylaminopyridine, pyridine or triethylamine to give sterol intermediates. The sterol intermediates and a hydrophilic carrier are esterified with a binder such as 1,3-dicyclohexylcarboimide, 1-ethyl-3-(3'-dimethylaminopropyl)carbodiimide(1-ethyl-3-£3'-dimethylaminopropyl|carbodiimide), oxalyl chloride, carbonyl diimidazole, 2-chloropyridinum, 2,2'-dipyridyl disulfide or 2-imidazoyl disulfide to give the phytosterol(formula 1; R= H or phytosterol group; n=30- 95).
Patent KR-20000011232-A (KR)
Inventor: YONEMURA MASATSUKU
IPC: E03F5/04
Filed: 1999-04-02
Abstract: PURPOSE: A cover of a drain pipe is provided to easily assemble, to have good drain efficiency and low production cost, not to generate noise. CONSTITUTION: The installation method of a cover of a drain pipe has the steps of: forming a side block main body(1) by concrete; establishing current channel(1a) whose cutaway section is U-shape having circular arc shaped current bottom(1a); forming the length(L1) of the side block main body(1) to be 2000mm; forming the upper part of the current channel(1a) as an opening; arranging a cover(2) through a slit(3) extends to lengthwise at both sides of left and right in parallel; installing two cover plate(4,4), a supporting lever(6) projected to support the cover plate(4,4) to improve the drainage efficiency and also to reduce the production expenses.
Patent KR-20000066402-A (KR)
Title: Lithium ion polymer battery
Inventor: JANG YUN HAN
IPC: H01M2/30
Filed: 1999-04-16
Abstract: PURPOSE: A lithium ion polymer battery is provided to improve the battery capacity by maximizing a space of a battery body occupied within a case. CONSTITUTION: A lithium ion polymer battery comprises a battery body(34), a pantograph(35), a case(37), and an electrode terminal(38). The battery body comprises a positive electrode plate(31), a negative electrode plate(32), and a separator(33). The pantograph is connected with the positive electrode plate and the negative electrode plate in order to collect the current. The case covers the battery body and the pantograph. The electrode terminal is connected with the pantograph and it is formed on the case. The electrode terminal comprises an outer terminal portion and an inner terminal portion.
Patent KR-19990083677-A (KR)
Title: 이중벽하수관제조방법및장치
IPC: B29C53/58
Filed: 1999-04-19
Abstract: 본 발명은 이중벽하수관 제조방법 및 그 장치에 관한 것으로 구조적으로 관의 강도를 향상 시키고 결함이 적은 고품질의 이중벽하수관을 제조하기 위한 것이다. 
     본 발명의 이중벽하수관 제조방법은, 압출기를 통해 프로파일을 연속적으로 압출하고, 프로파일을 진공 성형하여 고형화된 사각 프로파일을 제조하는 공정과, 고형화된 사각 프로파일을 드럼으로 인도하는 프로파일 유도 과정을 거쳐 회전하는 드럼에 프로파일을 공급하고, 사각 프로파일의 접합 해당 간극의 온도를 높히는 공정 및 사각 프로파일의 고형화가 완료된 상태에서 액상의 수지를 프로파일의 간극에 공급하여 사각 프로파일을 접합하는 공정을 포함하고, 사각 프로파일 결합면 사이에 접합수지를 공급하여 프로파일을 접합하고 드럼에 나선형상으로 감겨지는 사각 프로파일의 내벽에 방사상으로 냉각공기를 공급하여 관을 냉각 시키는 냉각공정으로 이중벽하수관을 제조하는 것을 특징으로 하며, 이중벽하수관 제조장치는, 수평방향으로 설치된 프로파일 성형장치와, 프로파일 성형장치에 대하여 직교되는 수직방향에 배치된 수지공급부, 드럼의 측면부에 설치된 가이드롤러, 드럼의 주변부에 설치된 가이드플레이트 및 온풍공급기를 구비하며, 드럼의 중심부에는 방사상의 냉각공기 분배드럼을 설치한 것을 특징으로 한다. 이에 따라 강도가 크고 결함이 적은 고품질의 이중벽하수관이 제작된다.
Patent KR-20000066657-A (KR)
Inventor: SIM WAN SEOK
IPC: H04B7/24
Filed: 1999-04-20
Abstract: PURPOSE: A radio interface unit in the WLL(Wireless Local Loop) using mobile communications is provided so as to use data communications or facsimile transmitting/receiving while changing locations by coupling a radio interface unit and a mobile communication terminal. CONSTITUTION: A radio interface unit in the WLL using mobile communications is composed of a radio interface unit(100), a mobile communication terminal(110) and a portable phone interface unit(10). The radio interface unit(100) comprises a data communication unit(60) supporting data communications, a facsimile interface unit(40) supporting facsimile communications and a voice communication unit(50) supporting hands free. The facsimile interface unit(40) is composed of a facsimile modem(41) and a facsimile port(42) connecting a facsimile terminal(120) and the facsimile modem(41). The voice communication unit(50) is composed of a DTMF receiving unit(51) and a phone port(52) connecting a telephone(130) and the DTMF receiving unit(51). The data communication unit(60) is composed of a data transmitting/receiving unit(61) and an RS-232C port(62) supporting the interface between a computer(140) and the data transmitting/receiving unit(61). In addition, the radio interface unit(100) comprises an SLAC(Subscriber Line Audio Codec)(20) and an SLIC(Subscriber Line Interface Circuit)(30).
Patent KR-20000067454-A (KR)
Inventor: KIM DONG GWON
IPC: B01D71/70
Filed: 1999-04-28
Abstract: PURPOSE: A polymer membrane prepared with a polymer material introduced a crosslinked structure in an inside polymer and a siloxane group in main chains is provided which has excellent processability, mechanical strength and separation performance. CONSTITUTION: Siloxane diamine of formula 1 and one or two or more dicarboxylic acid derivatives selected from diacylchloride, disulfonylchloride, diacid, dianhydride and monoacid-monoanhydride are polycondensated and crosslinked to produce a polymer separation membrane containing crosslinked organopolysiloxane. The polymer separation membrane exhibits excellent separation performance by applying to general membrane separation process such as gas separation and permeation evaporation.
Patent KR-20000074646-A (KR)
Title: Head drum assembly
Inventor: OH YONG GYU
IPC: G11B5/53
Filed: 1999-05-24
Abstract: PURPOSE: A head drum assembly is provided to easily eliminate static electricity generated through a carbon tip during movement of a tape and reduce a number of components, thereby reducing a fabricating cost and facilitating an assembling operation. CONSTITUTION: A head drum assembly comprises a fixing shaft(10); and a lower drum(30) fixed to a lower end of the fixing shaft to have a stator transformer at a central upper portion thereof; an upper drum(20) rolling supported by an upper and lower bearing at an upper face of the fixing shaft to have a rotor transformer(21) at a central lower portion thereof and a plurality of heads at an outer lower portion thereof; a motor(40) having a rotor fixed to the upper drum and a stator(43) fixed to the fixing shaft through a boss(50); and a grounding portion disposed at a center portion of the upper drum to earth static electricity generated at the upper and lower drum through a boss(50) and the fixing shaft to an outer side. In the head drum, the grounding portion comprised of an earth cap(100) having a through-hole(110) at a center portion thereof to be inserted into the central upper face of the upper drum; and a carbon tip(200) formed at an upper side of the earth cap to be contacted with the boss of the motor.
Patent KR-20000005808-A (KR)
Inventor: KOULLIEOSEU IKONOMOSEUEI
IPC: H04B1/54
Filed: 1999-06-01
Abstract: PURPOSE: A two-way filter is provided for signal paths of transmission and reception of a transceiver which operates in a half-duplex mode by using an intermediate single filter stage. CONSTITUTION: The transceiver(200) has two separated signal paths of the transmission and the reception between a baseband circuit(205) and an antennae(210). The signal path comprises the two-way filter(220) which comprises a switching circuit(223) coupled to an intermediate filter stage(224). The filter stage(224) operates as a function of the baseband circuit only in the selected path between the transmission path and the reception path.
Patent KR-20000005880-A (KR)
Inventor: HUJIWARAKIYOSI
IPC: G01M11/00
Filed: 1999-06-03
Abstract: PURPOSE: An image obtain method for testing flat panel display and apparatus thereof is provided to remove moire component. CONSTITUTION: The method comprises the steps of:storing display pixel data to image memory, detecting moire of one direction of X-axis or Y-axis, the moire generating in the display pixel data stored in the image memory, forming plurality of data string according to number of pixel included the moire generating period, and removing defect composition by smoothing pixel value of the plurality of data string, evaluating an image data of defect composition, storing the image data of the defect composition to image memory for defect composition, storing smooth image data to a smooth image memory.
Patent KR-20010002419-A (KR)
Inventor: HA YONG HAE
IPC: H01L21/768
Filed: 1999-06-15
Abstract: PURPOSE: A method for forming a multi-layered metal layer is to deposit a substance of a high melting point, and to allow the multi-layered metal layer to deposit at a high temperature. CONSTITUTION: Aluminum layer(11) of the first conductive layer is layered on a surface of a silicon substrate(10) using a sputtering process. A desired pattern of photoresist film is formed on an area of the aluminum layer, and is etched to form a pattern of the aluminum layer. After removing the pattern of the photoresist film, a nitride film(13) of the first insulation film is formed on the substrate containing the pattern of the aluminum layer using a plasma enhanced chemical vapor deposition. A pattern of photoresist film is formed on the nitride film to position a window of the phtoresist film on the pattern of the aluminum layer. The nitride film exposed through the window is etched using a reactive ion etching process to form a pattern of the nitride film. After removing the pattern of the photoresist film, a phospho-silicate glass(15) of the second insulation film is formed on the pattern of the nitride film.
Patent KR-20000011971-A (KR)
Inventor: NAKAO FUJIMASA
IPC: C07C63/10
Filed: 1999-07-26
Abstract: PURPOSE: A process for producing aromatic carboxylic acis is provided wherein an efficient use of the upper space of the reactor and maximization of the reactor are possible by means of reducing driving force and vibration by simplifying and reducing the structure of the reactor. CONSTITUTION: The process comprises: transforming an alkyl aromatic compound in reaction solvent containing aromatic carboxylic acids to aromatic carboxylic acids in the presence of an oxidase in the reactor; forming a slurry by crystallization of thus produced solution; purifying the slurry, and; recrystallizing and separating the purified aromatic compound. In the process above, the oxidization and/or recrystallization is conducted in such a manner that the crystals of aromatic carboxylic acids formed in the agitator have average diameter of less than 500 micro meter, and the concentration of the crystals from the slurry is 60wt.% or less.
Patent KR-20000034893-A (KR)
Inventor: IWAWAKI TOSHIO
IPC: A63F13/55
Filed: 1999-07-28
Abstract: PURPOSE: A novel video game apparatus which is easy for a player to cause a player object to operate, and a game program memory medium to be used thereon are provided. CONSTITUTION: The video game apparatus includes a CPU. The CPU detects an action code of a land object existing in front of a hole. If detecting "jump" set as an action code, a height (or depth) of the hole is calculated. When the hole height is greater than a predetermined height, a jump distance is calculated for the player object. The player object is caused to jump in accordance with that distance.
Patent KR-20010011498-A (KR)
Inventor: KO SEUNG HAN
IPC: H04B7/155
Filed: 1999-07-28
Abstract: PURPOSE: A method for testing the performance of a base station in a mobile communication system, is provided to have directional couplers for couple signals in each sub block of the base station, and to additionally install ports to a radio frequency(RF) transmission path and an RF receiving path. CONSTITUTION: A call is set to an optional sub block located on a radio frequency(RF) transmission/receiving path of a base station. A signal is coupled from the set sub block setting the call, and transmitted to a base station test unit(BTU). The BTU analyzes the coupled signal, to measure whether the sub block setting the call has an error. A coupling operation is performed through ports added to the sub block, by using a directional coupler. If more than one call is set, signals coupled from each sub block are mutually isolated and transmitted to the BTU.
Patent KR-20010019919-A (KR)
Inventor: HONG SANG PIL
IPC: A23L13/50
Filed: 1999-08-31
Abstract: PURPOSE: A method for preparing seasoned chicken containing Chitosan Oligosaccharide is provided for the chicken product having anticancer and antibacterial activities, activating lactic acid bacteria in the intestines, and promoting immunity. CONSTITUTION: The chicken is prepared by adding 20-40wt% of a seasoning liquid containing Chitosan Oligosaccharide containing more than 50% of 4-8mer to 100g of chicken and soaking the chicken in the seasoning at a temperature of 30deg.C for 2-5hr. The seasoning liquid comprises 30% of chikide, 20% of salt, 4% of MSG and curry powder, 5% of sugar, 15% of powdered garlic, 8% of powdered ginger, 3% of ground pepper, 2.5% of cinnamon, 3% of seasoning complex, 5.5% of flavoring agent and 0.05-3.0% of Chitosan Oligosaccharide.
Patent KR-20010026083-A (KR)
Inventor: CHO JONG WAN
IPC: F21S2/00
Filed: 1999-09-03
Abstract: PURPOSE: An ornamental cover of a lighting apparatus is provided to intercept a direct ray of light twice or more and make a tender atmosphere by a diffused-reflective refraction. CONSTITUTION: A lighting apparatus includes a lamp(10) which is turned on/off by an electric signal and a reflecting plate which is fixed to a plate(12) for supporting the lamp(10). A frame(16) is fixedly mounted by the supporting plate(12) and has a predetermined space for receiving the lamp(10). An ornamental cover(22) is attached to the frame(16) and comprises at least twofold synthetic resins(24), e.g. a urethane and PVC(polyvinyl chloride). The ornamental cover(22) keeps a specific ornamental appearance by means of the air which is injected into the twofold synthetic resins(24), and refracts irregularly the light radiated from the lamp(10), thereby making a tender atmosphere.
Patent KR-20010026232-A (KR)
Inventor: YU KYEONG WOON
Filed: 1999-09-03
Abstract: PURPOSE: A direct transaction system is provided to give a profit to a producer and a consumer by directly supplying commodities to a consumer and setting a demanding quantity and buying/selling price between a producer and a consumer. CONSTITUTION: A plurality of terminals(10-12) are provided for paying purchasing amount by an electronic money or a credit card. A main server(20) is connected to the plurality of terminals(10-12) and manages a registration information, buying/selling information and operation of the terminals(10-12). A registration database(22) is connected to the main server(20) and stores a registration information with respect to the sold commodities. A purchasing database(24) is connected to the main server(20) and stores a purchasing information of a user. A direct transacting database(32) stores information with respect to all commodities bought and sold by direct transacting. A producer database(34) stores general information with respect to a producer performing a direct transacting. A direct transacting market place database(36) stores information with respect to a direct transacting market place formed by a producer and a consumer. An information offering server(30) is connected to the main server(20) and manages the databases(32, 34, 36).
Patent KR-20010027032-A (KR)
Inventor: BAEK SUN GWON
IPC: H01Q1/12
Filed: 1999-09-10
Abstract: PURPOSE: A broadcasting receiving antenna for a vehicle is provided to be easily mounted to a vehicle without any limitations of mounting positions and achieve a good receiving capability without being affected by obstacles. CONSTITUTION: An antenna comprising a dielectric(21) and a conducting plate(22) is mounted in an air spoiler which is mounted to the rear end of a roof or a trunk cover of a vehicle. The conducting plate has a predetermined height(h) and includes upper and lower bending surfaces(23) to form an opening. The upper and lower bending surfaces slant downward and upward respectively, so that the dielectric inserted into the opening can not be easily separated therefrom. In order to receive TV broadcastings of the UHF band, i.e. the broad-band from channel 14(470MHz) to channel 83(890MHz), a pair of first cutting parts(24) and a pair of second cutting parts(25) are formed alternately at the upper bending surface. Each first cutting part has a predetermined width(W) and depth(D), and each second cutting part has a width(W1) and depth(D1) smaller than those of the first cutting part.