EP0417554A1 - Container with threaded cap - Google Patents

Container with threaded cap Download PDF

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Publication number
EP0417554A1
EP0417554A1 EP90116604A EP90116604A EP0417554A1 EP 0417554 A1 EP0417554 A1 EP 0417554A1 EP 90116604 A EP90116604 A EP 90116604A EP 90116604 A EP90116604 A EP 90116604A EP 0417554 A1 EP0417554 A1 EP 0417554A1
Authority
EP
European Patent Office
Prior art keywords
screw cap
container
mouth
peripheral wall
ring
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP90116604A
Other languages
German (de)
French (fr)
Inventor
Albert Gollasch
Johannes Engst
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
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
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP0417554A1 publication Critical patent/EP0417554A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
    • B65D41/04—Threaded or like caps or cap-like covers secured by rotation
    • B65D41/0435—Threaded or like caps or cap-like covers secured by rotation with separate sealing elements
    • B65D41/0442—Collars or rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
    • B65D41/04—Threaded or like caps or cap-like covers secured by rotation
    • B65D41/0407—Threaded or like caps or cap-like covers secured by rotation with integral sealing means
    • B65D41/0414—Threaded or like caps or cap-like covers secured by rotation with integral sealing means formed by a plug, collar, flange, rib or the like contacting the internal surface of a container neck

Definitions

  • the invention relates to a container with a screw cap - both made of plastic -, the screw cap having a conical sealing ring which, in the closed state, presses from the inside sealingly against the mouth edge of the spout.
  • Such containers such as bottles, canisters, jugs, cans, are often used for highly concentrated liquid or pasty chemicals, such as for pesticides.
  • the mouth of the spout has been sealed with a film after filling to ensure absolute tightness at least until the contents are opened and removed for the first time. If, for example, spraying devices are connected directly to the outlet nozzle, the sealing film must be removed completely. It is usually contaminated with the chemical and its disposal is problematic. The mouth of the outlet nozzle of such containers required a mechanical after-treatment, so that the film could be welded on in an absolutely sealing manner. After loosening or piercing the sealing film, it lost its function and there is no longer a tight seal.
  • cone seals, cup seals and sealing inserts made of rubber or other flexible materials are known. All of these embodiments are limited in their application. In particular, rubber seals swell under the influence of various chemicals and lose their sealing effect in this way. If a closed container falls from a certain height, there is a risk that the screw cap will snap off or that the container mouth will leak due to deformation.
  • the object is to improve a container with a screw cap so that a tight and fall-proof closure is ensured even without a sealing film.
  • the O-ring seal primarily takes over the sealing against the escape of vapors and it has the function of a safety seal, so to speak, in the event that the upstream sealing seat between the conical sealing ring and the mouth of the outlet nozzle does not seal sufficiently for manufacturing or other reasons. Should the O-ring nevertheless swell, it can only expand through the narrow opening in the direction of the front edge of the mouth of the outlet nozzle due to its storage in an undercut ring groove, thereby increasing the sealing effect.
  • the screw cap has an internally flat end section, and the conical sealing ring and the annular groove with an O-ring are arranged on or in an insert disk.
  • the container is labeled 1 and the screw cap is labeled 2. They are made of plastic by injection molding.
  • the container 1 is provided with an outlet 3, which has an external thread 4.
  • the actual mouth edge 5 of this outlet nozzle 3 is free of thread.
  • the screw cap 2 has a flat part (end face) 6, which merges into a peripheral wall 7. At the transition there is a thread-free section 8 on the peripheral edge 7, to which an internal thread 9 corresponding to the external thread 4 then connects.
  • a conical sealing ring 10 protrudes from the end face 6 into the outlet connection 3 and forms a sealing seat with its mouth rim 5.
  • the mouth edge 5 is pressed so far out that it is almost against the thread-free section 8, but does not exert any significant pressure on it.
  • the correct dimensioning of the thickness of the mouth rim 5 and the conical sealing ring 10 is therefore important.
  • an annular groove 11 Between the peripheral wall 7 and the conical sealing ring 10 there is an annular groove 11, the opening 12 of which is narrower than its width.
  • an elastomeric O-ring 13 is arranged, against which the end edge of the mouth edge 5 presses sealingly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)

Abstract

Bei Behältern (1) mit Schraubverschlußkappe (2) - beides aus Kunststoff - wird die Abdichtung und der feste Sitz der Schraubkappe (2) bei Fall dadurch verbessert, daß eine Konusringdichtung (10), welche von innen gegen den Mündungsrand (5) des Auslaufstutzens (3) drückt, mit einer O-Ringdichtung (13) kombiniert ist, welche in eine in die Stirnfläche (6) der Schraubverschlußkappe (2) zwischen Konusringdichtung (10) und Umfangswand (7) eingelassene hinterschnittene Ringnut (11) eingelegt ist, und wobei im Verschlußzustand der Mündungsrand (5) eng gegen die Umfangswandung (7) anliegt.For containers (1) with screw cap (2) - both made of plastic - the seal and the tight fit of the screw cap (2) is improved in the case that a conical ring seal (10), which from the inside against the mouth edge (5) of the outlet nozzle (3) presses, is combined with an O-ring seal (13), which is inserted into an undercut ring groove (11) inserted into an end face (6) of the screw cap (2) between the conical ring seal (10) and the peripheral wall (7), and wherein in the closed state the mouth edge (5) lies closely against the peripheral wall (7).

Description

Die Erfindung betrifft einen Behälter mit Schraubver­schlußkappe - beides aus Kunststoff -, wobei die Schraubverschlußkappe einen Konusdichtring aufweist, welcher im Verschlußzustand abdichtend von innen gegen den Mündungsrand des Auslaufstutzens drückt.The invention relates to a container with a screw cap - both made of plastic -, the screw cap having a conical sealing ring which, in the closed state, presses from the inside sealingly against the mouth edge of the spout.

Derartige Behälter, wie Flaschen, Kanister, Kannen, Do­sen, werden häufig für hochkonzentrierte flüssige oder pastöse Chemikalien verwendet, wie beispielsweise für Pflanzenschutzmittel.Such containers, such as bottles, canisters, jugs, cans, are often used for highly concentrated liquid or pasty chemicals, such as for pesticides.

Bisher hat man zusätzlich den Mündungsrand des Auslauf­stutzens nach dem Füllen mit einer Folie versiegelt, um absolute Dichtigkeit wenigstens bis zum erstmaligen Öff­nen und Entnehmen des Inhalts zu gewährleisten. Werden beispielsweise Spritzgeräte direkt an den Auslaufstutzen angeschlossen, so muß die Siegelfolie völlig entfernt werden. Sie ist meist mit der Chemikalie behaftet und ihre Entsorgung ist problematisch. Die Mündungskante des Auslaufstutzens solcher Behälter bedurfte einer mechani­ schen Nachbehandlung, damit die Folie auch wirklich ab­solut dichtend aufgeschweißt werden konnte. Nach dem Lö­sen oder Durchstoßen der Siegelfolie hat diese ihre Funktion verloren, und ein dichter Verschluß ist nicht mehr gegeben. Abgesehen von der Versiegelung sind Konus­dichtungen, Napfdichtungen und Dichteinlagen aus Gummi oder anderen flexiblen Werkstoffen bekannt. Alle diese Ausführungsformen sind in ihrer Anwendung begrenzt. Ins­besondere quellen Gummidichtungen unter dem Einfluß ver­schiedener Chemikalien auf und verlieren auf diese Weise ihre Dichtwirkung. Fällt ein verschlossener Behälter aus einiger Höhe, so besteht die Gefahr, daß die Schraubver­schlußkappe abspringt oder daß die Behältermündung durch Deformation undicht wird.So far, the mouth of the spout has been sealed with a film after filling to ensure absolute tightness at least until the contents are opened and removed for the first time. If, for example, spraying devices are connected directly to the outlet nozzle, the sealing film must be removed completely. It is usually contaminated with the chemical and its disposal is problematic. The mouth of the outlet nozzle of such containers required a mechanical after-treatment, so that the film could be welded on in an absolutely sealing manner. After loosening or piercing the sealing film, it lost its function and there is no longer a tight seal. Apart from the sealing, cone seals, cup seals and sealing inserts made of rubber or other flexible materials are known. All of these embodiments are limited in their application. In particular, rubber seals swell under the influence of various chemicals and lose their sealing effect in this way. If a closed container falls from a certain height, there is a risk that the screw cap will snap off or that the container mouth will leak due to deformation.

Es besteht die Aufgabe, einen Behälter mit Schraubver­schlußkappe dahingehend zu verbessern, daß ein dichter und fallsicherer Verschluß auch ohne Siegelfolie gewähr­leistet ist.The object is to improve a container with a screw cap so that a tight and fall-proof closure is ensured even without a sealing film.

Gelöst wird diese Aufgabe dadurch, daß innen in die Stirnfläche der Schraubverschlußkappe zwischen Konus­dichtring und Umfangswand eine Ringnut eingelassen ist, deren Öffnung schmaler ist als ihre Breite, wobei in dieser Ringnut ein elastomerer O-Ring angeordnet ist, und daß im Verschlußzustand der Mündungsrand eng an der Umfangswand anliegt.This object is achieved in that an annular groove is inserted into the end face of the screw cap between the conical sealing ring and the circumferential wall, the opening of which is narrower than its width, an elastomeric O-ring being arranged in this annular groove, and that in the closed state the muzzle edge is tight the peripheral wall rests.

Dadurch wird erreicht, daß der Dichtsitz zwischen Konus­dichtring und Mündungsrand des Auslaufstutzens die O-­ Ringdichtung vor dem Gefäßinhalt weitgehend schützt, so daß die Gefahr des Aufquellens wesentlich herabgesetzt ist. Die O-Ringdichtung übernimmt vor allem die Abdich­tung gegen den Austritt von Dämpfen und ihr kommt sozu­sagen die Funktion einer Sicherheitsdichtung zu für den Fall, daß der vorgelagerte Dichtsitz zwischen Konus­dichtring und Mündungsrand des Auslaufstutzens aus fer­tigungstechnischen oder sonstigen Gründen nicht genügend abdichtet. Sollte der O-Ring dennoch aufquellen, kann er sich aufgrund seiner Lagerung in einer hinterschnit­tenen Ringnut nur durch die schmale Öffnung in Richtung auf die Stirnkante des Mündungsrandes des Auslaufstut­zens ausdehnen und verstärkt dabei die Dichtwirkung. Durch die besondere Bemessung der Wandung des Mündungs­randes, nämlich daß dieser im Verschlußzustand unter dem Druck des Konusdichtringes an der Umfangswand der Ver­schlußkappe innen eng anliegt, wird bei einem Fall des Behälters verhindert, daß die Mündung verformt wird oder die Kappe abspringen kann. Mit solchen Gefäßen wird die Zulassungsforderung erfüllt, nämlich daß die Verschluß­kappe bei einem Fall des Gefäßes aus beispielsweise 1,50 m Höhe fest und dicht sitzen muß. Damit erübrigt sich eine Siegelfolie mit all ihren Nachteilen. Der Mün­dungsrand soll aber keinesfalls erheblichen Druck auf die Umfangswand ausüben, weil ansonsten Schwierigkeiten beim Abschrauben der Verschlußkappe auftreten könnten.This ensures that the sealing seat between the cone sealing ring and the mouth of the outlet nozzle Ring seal largely protects against the contents of the vessel, so that the risk of swelling is significantly reduced. The O-ring seal primarily takes over the sealing against the escape of vapors and it has the function of a safety seal, so to speak, in the event that the upstream sealing seat between the conical sealing ring and the mouth of the outlet nozzle does not seal sufficiently for manufacturing or other reasons. Should the O-ring nevertheless swell, it can only expand through the narrow opening in the direction of the front edge of the mouth of the outlet nozzle due to its storage in an undercut ring groove, thereby increasing the sealing effect. Due to the special dimensioning of the wall of the mouth edge, namely that it lies tightly against the inside of the closure cap under the pressure of the conical sealing ring on the circumferential wall of the closure cap, it is prevented that the mouth is deformed or the cap can come off when the container falls. With such vessels, the approval requirement is met, namely that the closure cap must fit tightly and tightly when the vessel falls, for example from a height of 1.50 m. This eliminates the need for a sealing film with all of its disadvantages. The edge of the mouth should under no circumstances exert considerable pressure on the peripheral wall, because otherwise difficulties could arise when unscrewing the closure cap.

Gemäß einer äquivalenten Ausführungsform besitzt die Schraubverschlußkappe einen innen ebenen Stirnabschnitt, und Konusdichtring sowie Ringnut mit O-Ring sind an bzw. in einer Einlegescheibe angeordnet.According to an equivalent embodiment, the screw cap has an internally flat end section, and the conical sealing ring and the annular groove with an O-ring are arranged on or in an insert disk.

In der Zeichnung ist der neue Behälter in einem Ausfüh­rungsbeispiel rein schematisch dargestellt und nachste­hend näher erläutert. Es zeigen:

  • Fig. 1 den Behälter im geschnittenen Abriß und
  • Fig. 2 die Einzelheit A in vergrößertem Maßstab.
In the drawing, the new container is shown purely schematically in one embodiment and explained in more detail below. Show it:
  • Fig. 1 the container in cut outline and
  • Fig. 2 shows the detail A on an enlarged scale.

Der Behälter ist mit 1 und die Schraubverschlußkappe mit 2 bezeichnet. Sie sind aus Kunststoff im Spritzgießver­fahren hergestellt. Der Behälter 1 ist mit einem Aus­laufstutzen 3 versehen, welcher ein Außengewinde 4 auf­weist. Der eigentliche Mündungsrand 5 dieses Auslauf­stutzens 3 ist frei von Gewinde. Die Schraubverschluß­kappe 2 weist einen flachen Teil (Stirnfläche) 6 auf, welcher in eine Umfangswand 7 übergeht. Am Übergang be­findet sich ein gewindefreier Abschnitt 8 am Umfangsrand 7, an welchen dann ein mit dem Außengewinde 4 korrespon­dierendes Innengewinde 9 anschließt. Aus der Stirnfläche 6 ragt ein Konusdichtring 10 in den Auslaufstutzen 3 hinein und bildet mit dessen Mündungsrand 5 einen Dicht­sitz. Dabei ist der Mündungsrand 5 so weit nach außen gedrückt, daß er am gewindefreien Abschnitt 8 nahezu anliegt, aber keinen wesentlichen Druck auf ihn ausübt. Die richtige Bemessung der Stärke des Mündungsrandes 5 und des Konusdichtringes 10 sind also wichtig. Zwischen der Umfangswand 7 und dem Konusdichtring 10 ist eine Ringnut 11 eingelassen, deren Öffnung 12 schmaler ist als ihre Breite. In ihr ist ein elastomerer O-Ring 13 angeordnet, gegen welchen die Stirnkante des Mündungs­randes 5 abdichtend drückt.The container is labeled 1 and the screw cap is labeled 2. They are made of plastic by injection molding. The container 1 is provided with an outlet 3, which has an external thread 4. The actual mouth edge 5 of this outlet nozzle 3 is free of thread. The screw cap 2 has a flat part (end face) 6, which merges into a peripheral wall 7. At the transition there is a thread-free section 8 on the peripheral edge 7, to which an internal thread 9 corresponding to the external thread 4 then connects. A conical sealing ring 10 protrudes from the end face 6 into the outlet connection 3 and forms a sealing seat with its mouth rim 5. The mouth edge 5 is pressed so far out that it is almost against the thread-free section 8, but does not exert any significant pressure on it. The correct dimensioning of the thickness of the mouth rim 5 and the conical sealing ring 10 is therefore important. Between the peripheral wall 7 and the conical sealing ring 10 there is an annular groove 11, the opening 12 of which is narrower than its width. In it an elastomeric O-ring 13 is arranged, against which the end edge of the mouth edge 5 presses sealingly.

Claims (1)

Behälter (1) mit Schraubverschlußkappe (2) - beides aus Kunststoff -, wobei die Schraubverschlußkappe (2) einen Konusdichtring (10) aufweist, welcher im Verschlußzu­stand abdichtend von innen gegen den Mündungsrand (5) des Auslaufstutzens (3) drückt, dadurch gekennzeichnet, daß innen in die Stirnfläche (6) der Schraubverschluß­kappe (2) zwischen Konusdichtring (10) und Umfangswand (7) eine Ringnut (11) eingelassen ist, deren Öffnung (12) schmaler ist als ihre Breite, wobei in dieser Ring­nut (11) ein elastomerer O-Ring (13) angeordnet ist, und daß im Verschlußzustand der Mündungsrand (5) eng an der Umfangswand (7) anliegt.Container (1) with a screw cap (2) - both made of plastic -, the screw cap (2) having a conical sealing ring (10) which, when closed, presses from the inside against the mouth rim (5) of the outlet nozzle (3), characterized in that that in the end face (6) of the screw cap (2) between the conical sealing ring (10) and the peripheral wall (7) an annular groove (11) is inserted, the opening (12) is narrower than its width, with an annular groove (11) in this Elastomeric O-ring (13) is arranged, and that in the closed state, the mouth edge (5) lies closely against the peripheral wall (7).
EP90116604A 1989-09-13 1990-08-30 Container with threaded cap Withdrawn EP0417554A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3930519 1989-09-13
DE3930519A DE3930519A1 (en) 1989-09-13 1989-09-13 CONTAINER WITH SCREW CAP

Publications (1)

Publication Number Publication Date
EP0417554A1 true EP0417554A1 (en) 1991-03-20

Family

ID=6389304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90116604A Withdrawn EP0417554A1 (en) 1989-09-13 1990-08-30 Container with threaded cap

Country Status (4)

Country Link
US (1) US5060813A (en)
EP (1) EP0417554A1 (en)
JP (1) JPH03111263A (en)
DE (1) DE3930519A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000048919A1 (en) * 1999-02-19 2000-08-24 Alcoa Deutschland Gmbh Verpackungswerke Plastic screw cap for containers and method for manufacturing a plastic screw cap
WO2011138062A1 (en) 2010-05-04 2011-11-10 Robert Bosch Gmbh Screw closure for soft packagings
ITMI20120443A1 (en) * 2012-03-21 2013-09-22 Roem S R L IMPROVED ENCLOSURE FOR CONTAINERS
EP3382239B1 (en) * 2017-03-27 2020-09-30 Medisca Pharmaceutique Inc. Lockable container assembly

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US5411157A (en) * 1990-05-30 1995-05-02 Beeson And Sons Limited Container and the manufacture thereof
GB2257693B (en) * 1991-07-10 1995-08-02 Beeson & Sons Ltd A container and closure
US5560504A (en) * 1993-03-24 1996-10-01 Molinaro; Luca Snap on pull off tamper indicating flexible cap and neck configuration
DE9407719U1 (en) * 1994-05-10 1994-09-22 Rathor Ag, Appenzell Detachable detergent bottle
DE9419630U1 (en) * 1994-12-09 1995-02-02 Fresenius AG, 61352 Bad Homburg Device for closing a line
US6116440A (en) * 1996-11-01 2000-09-12 Colgate - Palmolive Company Resealable thermoformed container
US5860546A (en) * 1997-03-15 1999-01-19 The Procter & Gamble Company Interference squeeze contour seal assembly closure having a dual thickness neck portion
US5845798A (en) * 1997-03-15 1998-12-08 The Procter & Gamble Company Closure assembly having a deformable anti-backoff feature independent of the screw threads
US6702133B1 (en) * 2000-10-12 2004-03-09 Crown Cork & Seal Technologies Corporation Plastic retorable container system having a closure with an improved conformable liner
US6485655B1 (en) * 2001-08-02 2002-11-26 General Electric Company Method and apparatus for retaining an internal coating during article repair
JP4484029B2 (en) * 2001-12-28 2010-06-16 東洋製罐株式会社 Container sealing structure, container provided with the sealing structure, and method for producing the sealing structure
AUPS053202A0 (en) * 2002-02-15 2002-03-07 Zork Pty Ltd Closure
US20050194343A1 (en) * 2004-03-08 2005-09-08 Drug Plastics & Glass Company, Inc. Closure with linerless seal
MX2011000018A (en) * 2008-07-03 2011-06-01 Eleven Inc 7 Rolling information display for roller grill.
WO2011082246A2 (en) * 2009-12-30 2011-07-07 Tim Andis Quick access closure apparatus and methods of use
WO2015022396A1 (en) * 2013-08-14 2015-02-19 Basf Se A container for transporting and storing a liquid
US9687849B2 (en) * 2015-06-06 2017-06-27 IGU Holdings, LLC Leak proof, air tight plastic container device
CN111762448A (en) * 2020-07-29 2020-10-13 付启桓 Sealing structure of bottle body and bottle cap
CN113682633B (en) * 2021-08-27 2022-10-28 芜湖集拓橡胶技术有限公司 Low-hardness low-emission ethylene propylene diene monomer sealing element

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000048919A1 (en) * 1999-02-19 2000-08-24 Alcoa Deutschland Gmbh Verpackungswerke Plastic screw cap for containers and method for manufacturing a plastic screw cap
WO2011138062A1 (en) 2010-05-04 2011-11-10 Robert Bosch Gmbh Screw closure for soft packagings
DE102010028522A1 (en) 2010-05-04 2011-11-10 Robert Bosch Gmbh Screw cap for soft packaging
ITMI20120443A1 (en) * 2012-03-21 2013-09-22 Roem S R L IMPROVED ENCLOSURE FOR CONTAINERS
EP2641841A1 (en) * 2012-03-21 2013-09-25 Affaba & Ferrari S.r.l. Closure for containers with improved sealing
EP3382239B1 (en) * 2017-03-27 2020-09-30 Medisca Pharmaceutique Inc. Lockable container assembly

Also Published As

Publication number Publication date
US5060813A (en) 1991-10-29
DE3930519C2 (en) 1992-07-30
DE3930519A1 (en) 1991-03-21
JPH03111263A (en) 1991-05-13

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