ID18221A - Bahan filter yang dapat terurai secara biologi dan metode untuk pembuatannya - Google Patents

Bahan filter yang dapat terurai secara biologi dan metode untuk pembuatannya

Info

Publication number
ID18221A
ID18221A IDP962789A ID962789A ID18221A ID 18221 A ID18221 A ID 18221A ID P962789 A IDP962789 A ID P962789A ID 962789 A ID962789 A ID 962789A ID 18221 A ID18221 A ID 18221A
Authority
ID
Indonesia
Prior art keywords
declined
making
filter materials
biological filter
biological
Prior art date
Application number
IDP962789A
Other languages
English (en)
Indonesian (id)
Inventor
Jurgen Lorcks
Harald Schmidt
Original Assignee
Biotech Biolog Naturverpackung
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7773698&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ID18221(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Biotech Biolog Naturverpackung filed Critical Biotech Biolog Naturverpackung
Publication of ID18221A publication Critical patent/ID18221A/id

Links

Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/067—Use of materials for tobacco smoke filters characterised by functional properties
    • A24D3/068—Biodegradable or disintegrable
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/48—Processes of making filters

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Biological Depolymerization Polymers (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Filtering Materials (AREA)
IDP962789A 1995-09-29 1996-09-30 Bahan filter yang dapat terurai secara biologi dan metode untuk pembuatannya ID18221A (id)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19536505A DE19536505A1 (de) 1995-09-29 1995-09-29 Biologisch abbaubares Filtermaterial und Verfahren zu seiner Herstellung

Publications (1)

Publication Number Publication Date
ID18221A true ID18221A (id) 1998-03-19

Family

ID=7773698

Family Applications (1)

Application Number Title Priority Date Filing Date
IDP962789A ID18221A (id) 1995-09-29 1996-09-30 Bahan filter yang dapat terurai secara biologi dan metode untuk pembuatannya

Country Status (22)

Country Link
US (1) US6062228A (fr)
EP (1) EP0861036B1 (fr)
JP (1) JP3266272B2 (fr)
KR (1) KR100261855B1 (fr)
CN (1) CN1113618C (fr)
AR (1) AR003751A1 (fr)
AT (1) ATE188599T1 (fr)
AU (1) AU696205B2 (fr)
BR (1) BR9611208A (fr)
CA (1) CA2233368C (fr)
CO (1) CO4750781A1 (fr)
DE (2) DE19536505A1 (fr)
ES (1) ES2141539T3 (fr)
GR (1) GR3032900T3 (fr)
ID (1) ID18221A (fr)
PL (1) PL180599B1 (fr)
PT (1) PT861036E (fr)
RU (1) RU2153828C2 (fr)
TR (1) TR199800561T1 (fr)
TW (1) TW546125B (fr)
WO (1) WO1997012528A1 (fr)
ZA (1) ZA968199B (fr)

Families Citing this family (74)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE242295T1 (de) * 1995-04-07 2003-06-15 Biotec Biolog Naturverpack Biologisch abbaubare polymermischung
US5911224A (en) * 1997-05-01 1999-06-15 Filtrona International Limited Biodegradable polyvinyl alcohol tobacco smoke filters, tobacco smoke products incorporating such filters, and methods and apparatus for making same
US6573340B1 (en) 2000-08-23 2003-06-03 Biotec Biologische Naturverpackungen Gmbh & Co. Kg Biodegradable polymer films and sheets suitable for use as laminate coatings as well as wraps and other packaging materials
US7297394B2 (en) 2002-03-01 2007-11-20 Bio-Tec Biologische Naturverpackungen Gmbh & Co. Kg Biodegradable films and sheets suitable for use as coatings, wraps and packaging materials
US7241832B2 (en) * 2002-03-01 2007-07-10 bio-tec Biologische Naturverpackungen GmbH & Co., KG Biodegradable polymer blends for use in making films, sheets and other articles of manufacture
DE10206924B4 (de) * 2002-02-19 2005-12-15 Papierfabrik Schoeller & Hoesch Gmbh & Co. Kg Heisssiegelfähige Filtermaterialien
KR20030075882A (ko) * 2002-03-21 2003-09-26 주식회사 그린메이드 전분 화이버 부직포로 제조된 에어필터 및 그 제조방법
US6863074B2 (en) * 2002-08-30 2005-03-08 Philip Morris Usa Inc. Cigarette filters comprising unfunctionalized porous polyaromatic resins for removing gas phase constituents from mainstream tobacco smoke
DE10252823A1 (de) * 2002-11-13 2004-06-09 Biotec Biologische Naturverpackungen Gmbh & Co. Kg Filterelement
US7306093B2 (en) * 2003-02-14 2007-12-11 Eastman Chemical Company Packages, packaging systems, methods for packaging and apparatus for packaging
US7172814B2 (en) * 2003-06-03 2007-02-06 Bio-Tec Biologische Naturverpackungen Gmbh & Co Fibrous sheets coated or impregnated with biodegradable polymers or polymers blends
ATE361004T1 (de) 2003-09-03 2007-05-15 Hauni Maschinenbau Ag Verfahren und vorrichtung zur herstellung eines filterstrangs
US20050238774A1 (en) * 2004-04-22 2005-10-27 Gold Medal Products Co. Cotton candy machine
CA2566989A1 (fr) * 2004-06-03 2005-12-15 Novamont S.P.A. Systeme ventile de collecte de dechets organiques
US7856989B2 (en) * 2004-12-30 2010-12-28 Philip Morris Usa Inc. Electrostatically produced fast dissolving fibers
US7989524B2 (en) * 2005-07-19 2011-08-02 The United States Of America, As Represented By The Secretary Of Agriculture Fiber-reinforced starch-based compositions and methods of manufacture and use
US20070021515A1 (en) * 2005-07-19 2007-01-25 United States (as represented by the Secretary of Agriculture) Expandable starch-based beads and method of manufacturing molded articles therefrom
US20070074733A1 (en) * 2005-10-04 2007-04-05 Philip Morris Usa Inc. Cigarettes having hollow fibers
CN1817253B (zh) * 2005-12-21 2010-05-12 宁波经济技术开发区亚太实业有限公司 一种烟气过滤材料及其制备方法
MX2008012396A (es) 2006-03-28 2009-02-11 Philip Morris Prod Articulo para fumar con un restrictor.
DE102006018101A1 (de) * 2006-04-18 2007-10-25 Hauni Maschinenbau Ag Aufbereitungseinheit zur Aufbereitung mindestens eines Filtertowstreifens sowie eine Vorrichtung mit mindestens zwei derartigen Aufbereitungseinheiten
US20080047571A1 (en) * 2006-07-12 2008-02-28 Philip Morris Usa Inc. Smoking article with plate impactor
US8353298B2 (en) * 2006-07-12 2013-01-15 Philip Morris Usa Inc. Smoking article with impaction filter segment
US8602036B2 (en) * 2006-08-03 2013-12-10 Philip Morris Usa Inc. Smoking articles enhanced to deliver additives incorporated within electrospun microfibers and nonofibers, and related methods
US7896011B2 (en) * 2006-08-08 2011-03-01 Philip Morris Usa, Inc. Method of forming a filter component
US8424539B2 (en) * 2006-08-08 2013-04-23 Philip Morris Usa Inc. Smoking article with single piece restrictor and chamber
TW200911138A (en) * 2007-03-09 2009-03-16 Philip Morris Prod Smoking articles with restrictor and aerosol former
TW200911143A (en) * 2007-03-09 2009-03-16 Philip Morris Prod Restrictor attachment for unfiltered smoking article
TW200911141A (en) * 2007-03-09 2009-03-16 Philip Morris Prod Super recessed filter cigarette restrictor
TW200900014A (en) * 2007-03-09 2009-01-01 Philip Morris Prod Smoking article filter with annular restrictor and downstream ventilation
US7878210B2 (en) * 2007-06-04 2011-02-01 Philip Morris Usa Inc. Cellulose acetate fiber modification
US8113215B2 (en) * 2007-06-21 2012-02-14 Philip Morris Usa Inc. Smoking article filter having liquid additive containing tubes therein
EP2253231A1 (fr) * 2009-05-18 2010-11-24 Philip Morris Products S.A. Article à fumer avec élément de restriction de flux amélioré
US9220297B2 (en) * 2009-08-07 2015-12-29 R. J. Reynolds Tobacco Company Materials, equipment, and methods for manufacturing cigarettes
US8434498B2 (en) * 2009-08-11 2013-05-07 R. J. Reynolds Tobacco Company Degradable filter element
US8424540B2 (en) * 2009-10-09 2013-04-23 Philip Morris Usa Inc. Smoking article with valved restrictor
GB2474694B (en) * 2009-10-23 2011-11-02 Innovia Films Ltd Biodegradable composites
GB0922253D0 (en) * 2009-12-21 2010-02-03 British American Tobacco Co Sheet filter materials with additives
CN102134758B (zh) * 2010-01-27 2012-06-13 大亚科技股份有限公司 一种改性烟用丝束制备方法
US9226524B2 (en) 2010-03-26 2016-01-05 Philip Morris Usa Inc. Biopolymer foams as filters for smoking articles
TW201204272A (en) 2010-03-26 2012-02-01 Philip Morris Prod Smoking articles with significantly reduced gas vapor phase smoking constituents
US20120000480A1 (en) 2010-06-30 2012-01-05 Sebastian Andries D Biodegradable cigarette filter
US20120000481A1 (en) 2010-06-30 2012-01-05 Dennis Potter Degradable filter element for smoking article
US8950407B2 (en) 2010-06-30 2015-02-10 R.J. Reynolds Tobacco Company Degradable adhesive compositions for smoking articles
WO2012012053A1 (fr) 2010-06-30 2012-01-26 R.J. Reynolds Tobacco Company Filtre à cigarette biodégradable
US20120017925A1 (en) 2010-06-30 2012-01-26 Sebastian Andries D Degradable cigarette filter
CN101889732A (zh) * 2010-07-19 2010-11-24 湖北金叶玉阳化纤有限公司 一种聚乳酸纤维烟用丝束的制备方法
GB201105455D0 (en) * 2011-03-31 2011-05-18 British American Tobacco Co Blends of a polylactic acid and a water soluble polymer
US20120305015A1 (en) * 2011-05-31 2012-12-06 Sebastian Andries D Coated paper filter
TR201815766T4 (tr) 2011-06-23 2018-11-21 British American Tobacco Investments Ltd Polilaktid fiberleri içeren filtre materyali.
GB201112402D0 (en) 2011-07-19 2011-08-31 British American Tobacco Co Cellulose acetate compositions
US8973588B2 (en) 2011-07-29 2015-03-10 R.J. Reynolds Tobacco Company Plasticizer composition for degradable polyester filter tow
US9289012B2 (en) 2011-07-29 2016-03-22 R. J. Reynolds Tobacco Company Plasticizer composition for degradable polyester filter tow
KR101414000B1 (ko) 2011-07-29 2014-08-06 조대행 생분해성 유체 여과용 필터
CN102511929A (zh) * 2011-11-10 2012-06-27 云南正邦生物技术有限公司 一种通风固形复合嘴棒及其制备方法
PL219777B1 (pl) * 2012-03-26 2015-07-31 Int Tobacco Machinery Poland Układ czyszczący do transportera bębnowego urządzenia do podawania segmentów filtrowych do urządzenia produkującego filtry wielosegmentowe oraz sposób czyszczenia transportera bębnowego
US9179709B2 (en) 2012-07-25 2015-11-10 R. J. Reynolds Tobacco Company Mixed fiber sliver for use in the manufacture of cigarette filter elements
US9119419B2 (en) 2012-10-10 2015-09-01 R.J. Reynolds Tobacco Company Filter material for a filter element of a smoking article, and associated system and method
PL223115B1 (pl) * 2013-02-15 2016-10-31 Int Tobacco Machinery Poland Spółka Z Ograniczoną Odpowiedzialnością Sposób, mechanizm i urządzenie do chwilowego kompresowania materiału filtracyjnego
CN103300475B (zh) * 2013-06-28 2014-12-03 湖北中烟工业有限责任公司 可降解型烟用复合滤棒的制备方法
US20160073686A1 (en) 2014-09-12 2016-03-17 R.J. Reynolds Tobacco Company Tobacco-derived filter element
US10400105B2 (en) 2015-06-19 2019-09-03 The Research Foundation For The State University Of New York Extruded starch-lignin foams
JP2017007296A (ja) * 2015-06-25 2017-01-12 株式会社カネカ 断熱性能に優れた押出発泡成形体の製造方法
CN105011346B (zh) * 2015-08-04 2017-01-25 湖南中烟工业有限责任公司 一种再造烟草薄片丝的制备方法
CN105686074B (zh) * 2016-03-08 2019-11-26 云南中烟工业有限责任公司 一种可生物降解的滤嘴香料棒及其制备方法
US10524500B2 (en) 2016-06-10 2020-01-07 R.J. Reynolds Tobacco Company Staple fiber blend for use in the manufacture of cigarette filter elements
CN106245157A (zh) * 2016-08-30 2016-12-21 甘木林 一种多功能高分子过滤纤维材料
CN109123771B (zh) * 2017-06-28 2021-03-16 湖南中烟工业有限责任公司 一种空芯卷烟滤棒及其制备方法和应用
KR102035303B1 (ko) * 2018-02-13 2019-10-22 대구보건대학교산학협력단 치기공용 폐석고 처리장치
HUE060747T2 (hu) * 2018-12-18 2023-04-28 Philip Morris Products Sa Eljárás és berendezés lap elõállítására alkaloidokat tartalmazó anyagból
KR20210102260A (ko) * 2018-12-18 2021-08-19 필립모리스 프로덕츠 에스.에이. 알칼로이드 함유 물질의 시트를 제조하기 위한 방법 및 장치
KR102327742B1 (ko) * 2021-04-14 2021-11-17 김순연 담체 제조방법 및 그 제품
CN115413819A (zh) * 2022-09-23 2022-12-02 云南中烟工业有限责任公司 一种分组加工的聚乳酸纤维滤棒及其制备方法
US20240180237A1 (en) * 2022-12-06 2024-06-06 Greenbutts Llc Fiber cell structure expansion process

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026226A (en) * 1957-12-09 1962-03-20 Eastman Kodak Co Process of manufacturing filters
DE3710677A1 (de) * 1987-03-31 1988-10-13 Bat Cigarettenfab Gmbh Vorrichtung zum expandieren von zerkleinertem tabakmaterial
GB8712617D0 (en) * 1987-05-28 1987-07-01 British American Tobacco Co Tobacco smoke filters
IE66735B1 (en) * 1988-11-03 1996-02-07 Biotec Biolog Naturverpack Thermoplastically workable starch and a method for the manufacture thereof
US4863655A (en) * 1988-12-30 1989-09-05 National Starch And Chemical Corporation Biodegradable packaging material and the method of preparation thereof
US5153037A (en) * 1988-12-30 1992-10-06 National Starch And Chemical Investment Holding Corporation Biodegradable shaped products and the method of preparation thereof
DE4013304C2 (de) * 1990-04-26 1993-11-25 Bat Cigarettenfab Gmbh Verfahren zur Herstellung von Cigarettenfiltern sowie Cigarettenfilter
DE4013293A1 (de) * 1990-04-26 1991-11-07 Bat Cigarettenfab Gmbh Cigarettenfilter
JP3194580B2 (ja) * 1991-03-11 2001-07-30 日本たばこ産業株式会社 シガレット
DE4109603A1 (de) * 1991-03-23 1992-09-24 Hauni Werke Koerber & Co Kg Verfahren und vorrichtung zum herstellen von filterstaeben fuer zigaretten
DE4116404A1 (de) * 1991-05-18 1992-11-19 Tomka Ivan Polymermischung fuer die herstellung von folien
JPH0525152A (ja) * 1991-07-22 1993-02-02 Japan Tobacco Inc ３−ｄｐａ−ラクトンの製造法
AT396862B (de) * 1991-10-22 1993-12-27 Austria Tabakwerke Ag Verfahren zur herstellung eines zelluloseazetat-kabels und zigarettenfilter daraus
GB9122447D0 (en) * 1991-10-23 1991-12-04 Rothmans Int Tobacco Lightweight cigarette filter and cigarettes incorporating such filters
DE4136694C2 (de) * 1991-11-07 1996-10-10 Inventa Ag Stärkefaser oder Stärke-modifizierte Faser, Verfahren zu ihrer Herstellung sowie ihre Verwendung
SG47625A1 (en) * 1991-11-14 1998-04-17 Bio Tech Biolog Naturverparkun Biodegradable mould material
JP3283574B2 (ja) * 1992-06-30 2002-05-20 日本たばこ産業株式会社 たばこ製造機の紙巻たばこ軸方向移動装置
TW256845B (fr) * 1992-11-13 1995-09-11 Taisyal Kagaku Kogyo Kk
GB9305066D0 (en) * 1993-03-12 1993-04-28 British American Tobacco Co Improvements relating to filtration materials
DE4322966C2 (de) * 1993-07-09 1995-10-26 Rhodia Ag Rhone Poulenc Aus Celluloseacetat geformte Gebilde und ihre Verwendung als Filtertow und Tabakrauchfilterelement
DE4322967C1 (de) * 1993-07-09 1994-10-13 Rhodia Ag Rhone Poulenc Filtertow aus Celluloseacetat, dessen Herstellung und Verwendung als Tabakrauchfilterelement
DE4322965C1 (de) * 1993-07-09 1994-10-06 Rhodia Ag Rhone Poulenc Filtertow und Verfahren zu dessen Herstellung sowie dessen Verwendung als Tabakrauchfilterelement
CA2127817C (fr) * 1993-07-13 2007-07-03 Hitoshi Tsugaya Filtres a tabac et methode pour leur production
TW241198B (en) * 1993-09-06 1995-02-21 Daicel Chem A tobacco filter material and a method of producing the same
US5497793A (en) * 1993-09-22 1996-03-12 Kubica; Stephen A. Cigarette and soluble cigarette filter therefor
US5396909A (en) * 1993-12-16 1995-03-14 R. J. Reynolds Tobacco Company Smoking article filter
DE4409465A1 (de) * 1994-03-19 1995-09-21 Kinkel Werner Helmut Biologisch abbaubare Vliese und Vliesverbundmaterialien

Also Published As

Publication number Publication date
DE19536505A1 (de) 1997-04-10
GR3032900T3 (en) 2000-07-31
CN1198080A (zh) 1998-11-04
ES2141539T3 (es) 2000-03-16
CA2233368C (fr) 2000-12-05
KR100261855B1 (ko) 2000-08-01
PL180599B1 (pl) 2001-03-30
ATE188599T1 (de) 2000-01-15
AU696205B2 (en) 1998-09-03
AU7215996A (en) 1997-04-28
PT861036E (pt) 2000-06-30
CN1113618C (zh) 2003-07-09
JPH11500629A (ja) 1999-01-19
KR19990044684A (ko) 1999-06-25
RU2153828C2 (ru) 2000-08-10
JP3266272B2 (ja) 2002-03-18
EP0861036A1 (fr) 1998-09-02
BR9611208A (pt) 1999-04-06
AR003751A1 (es) 1998-09-09
CA2233368A1 (fr) 1997-04-10
US6062228A (en) 2000-05-16
DE59604195D1 (de) 2000-02-17
TW546125B (en) 2003-08-11
TR199800561T1 (xx) 1998-06-22
EP0861036B1 (fr) 2000-01-12
PL325968A1 (en) 1998-08-17
ZA968199B (en) 1997-05-02
WO1997012528A1 (fr) 1997-04-10
CO4750781A1 (es) 1999-03-31

Similar Documents

Publication Publication Date Title
ID18221A (id) Bahan filter yang dapat terurai secara biologi dan metode untuk pembuatannya
DE69709697D1 (de) Gasfilter und verfahren zur reinigung desselben
ID18531A (id) Pembersih antar-gigi dan proses untuk pembuatannya
HU9602224D0 (en) Hematopoietic protein and materials and methods for making it
GB2332380B (en) Membrane filter apparatus and method for operating the membrane filter apparatus
ZA963196B (en) NOx catalyst/trap and method of using the same
AU3506495A (en) Structure and method for bonding or fusion of biological materials
DE69403797T2 (de) Nichtgewebte materialien und methode zur herstellung derselben
GB9412967D0 (en) Disposable receptacle and method of forming the same
DE69619615D1 (de) Verfahren zur digitalen Breitbandfilterung und Filter zur Durchführung des Verfahrens
DE69517466D1 (de) Material zur Entfernung von HIV und verwandten Substanzen
ID19385A (id) Adesif termosetting dan metoda pembuatannya
EP1013295A4 (fr) Unite de filtrage permettant d'extraire les leucocytes et mode d'utilisation
IL131312A0 (en) Method and apparatus for continuous flow isoelectric focusing for purifying biological substances
ID30044A (id) Metode dan komposisi untuk meminimkan pengotor biologi dan koloid
ID18534A (id) Proses pembuatan bahan penyaring
DE69523362D1 (de) Bilderzeugungsverfahren und Prozesskassette
IL135301A0 (en) Filter material construction and method
GB9818412D0 (en) Jig for manufacturing long period grating filter and apparatus and method for manufacturing long period grating filter using the same
ID18860A (id) Katalis hidrocracking distilat dan proses pembuatannya
DE69529066D1 (de) Effizienter medianfilter und verfahren
AU4393497A (en) Method for the sterilization of biological materials
ID18246A (id) Papan saringan dan metoda pembuatannya
GB9510928D0 (en) Analysis of biological material
BR9507375A (pt) Tratamento de superficies particuladas