EP2108599A1 - Piston à cartouche - Google Patents

Piston à cartouche Download PDF

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Publication number
EP2108599A1
EP2108599A1 EP09157743A EP09157743A EP2108599A1 EP 2108599 A1 EP2108599 A1 EP 2108599A1 EP 09157743 A EP09157743 A EP 09157743A EP 09157743 A EP09157743 A EP 09157743A EP 2108599 A1 EP2108599 A1 EP 2108599A1
Authority
EP
European Patent Office
Prior art keywords
cartridge
piston
protective edge
sealing lip
side wall
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.)
Granted
Application number
EP09157743A
Other languages
German (de)
English (en)
Other versions
EP2108599B1 (fr
Inventor
Achim Helmenstein
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.)
Fischbach KG Kunststoff Technik
Original Assignee
Fischbach KG Kunststoff Technik
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 Fischbach KG Kunststoff Technik filed Critical Fischbach KG Kunststoff Technik
Priority to PL09157743T priority Critical patent/PL2108599T3/pl
Publication of EP2108599A1 publication Critical patent/EP2108599A1/fr
Application granted granted Critical
Publication of EP2108599B1 publication Critical patent/EP2108599B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/0005—Containers or packages provided with a piston or with a movable bottom or partition having approximately the same section as the container
    • 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
    • B65D2205/00—Venting means
    • B65D2205/04—Venting means for venting during the initial insertion of a piston

Definitions

  • the invention relates to a one-piece cartridge piston for extruding mass from a cartridge, with a front piston breast, a circumferential side wall and at least one provided on the side wall, projecting forward flexible sealing lip.
  • Cartridges for auspressbare masses consist of a tubular cartridge body, in which the mass is filled.
  • the cartridge body is closed at the front end and the filling of the mass takes place from the open rear end.
  • the cartridge piston is also inserted from the rear end into the cartridge body to seal it.
  • the air trapped between the cartridge piston and the mass contained in the cartridge must be able to escape. If the air remained in the cartridge, the risk of hardening of the mass would exist.
  • the mass When filling a cartridge with a measured amount of the extrudable mass, the mass forms an end surface with a central dome surrounded by an annular trench.
  • the piston breast When setting the cartridge piston, the piston breast first hits against the middle dome. As a result, its mass is forced outwards and enters the tip region of the sealing lips. If the air can not escape backwards enough along the piston, air bubbles will be created. This is particularly due to the relatively long and narrow flow path of the air along the side wall of the piston. Another difficulty is that the side obliquely protruding sealing lips can be damaged when setting the piston, whereby their sealing function suffers when pressing the mass.
  • the invention has for its object to provide a cartridge piston with improved venting behavior when setting the piston and low susceptibility to piston handling.
  • the cartridge piston according to the invention is characterized by the patent claim 1. It is characterized in that the side wall has a circumferential or interrupted front protective edge, which covers a partial region of the at least one sealing lip in axial projection.
  • the protective edge has a greater rigidity than the sealing lips. It is relatively rigid and serves as a protective screen, which covers and shields a portion of the sealing lip when inserting the piston into the cartridge. This avoids that when inserting the piston into the cartridge, one of the sealing lips on the rear edge of the cartridge kinks over and is damaged.
  • the protective edge which is rigid relative to the sealing lips, protects the sealing lips from damage by mutual impacting in the transport carton of the pistons and also on the piston conveying sections, eg, in the direction of travel. As in the production of pistons and on the filling machines for filling the cartridge packaging.
  • the sealing lips must have a high degree of flexibility in order to be able to tightly conform to the cartridge wall in a sealing manner even at low pressures.
  • the sealing lips are designed so flexible by having at least in some areas a small wall thickness, but at the same time have the greatest possible length.
  • the sealing lips are at least three times, better five times, more preferably at least eight times longer than the thinnest point of the sealing lip is thick.
  • a sealing lip which is protected by a protective edge is provided. The intended for this sealing lip protective edge is then executed in any case more rigid than the associated sealing lip and then covered with its axial shadow at least a portion of the sealing lip.
  • the protective edge covers at least 50%, better more than 70%, even better more than 90% of the radial height of a sealing lip.
  • a front protective edge and / or a rear protective edge on the piston is provided.
  • a front protective edge is at the front end of the side wall, laterally projecting from this, mainly transverse to Axial direction of the piston arranged.
  • a rear protective edge is arranged at the rear end of the side wall in a mainly axis-parallel orientation to the piston axis.
  • the front protective edge also causes a rejection of the auspressbaren mass when inserting the piston into the cartridge, wherein the mass initially pushed outward and then penetrates after deflection around the front protective edge in the annular gap between the side wall and the sealing lip.
  • This deflection causes an extension of the path of the mass along the end wall of the piston, so that the air has sufficient time to escape on the side wall of the piston to its rear end.
  • the front protective edge effectively forms a projection on which the mass can be distributed during advancement of the piston without air bubbles being trapped in the mass in front of the piston.
  • the front guard edge preferably has no contact with the cartridge wall (its diameter is thus smaller than the cartridge inner diameter).
  • the rear guard edge is preferably in contact with the cartridge wall (its diameter is thus larger than the cartridge inner diameter).
  • the respective protective edge is always in front of the sensitive end of the sealing lip.
  • the protective edge is located at the front end of the side wall.
  • the protective edge is located at the rear end of the side wall.
  • the protective edge may have various embodiments. It can be closed circumferentially or interrupted. It may even be so far interrupted that only segments of a protective edge are present. In extreme embodiments, the protective edge even consists only of at least three ribs, which also also form an axial covering shadow over the sealing lip for the protective function.
  • a front protective edge acts against the product, which is the squeezable mass, and protects the sealing lip from the product.
  • a rear protective edge is useful when the extrusion of the mass from the cartridge is effected by means of compressed air. The rear protection edge then protects the sealing lip against the compressed air acting from behind.
  • the protective edges also have a supporting effect, by supporting the piston on the cartridge wall and guide to avoid tilting.
  • the front protective edge is made relatively rigid and inflexible so that it protects the sealing lip mainly when inserting the piston into the cartridge.
  • the rear protective edge can be designed to be more flexible than the front protective edge, since it is intended to protect the sealing lip mainly in the transport carton and on the piston conveyor line during production of the pistons or during cartridge filling. This load is not as critical as the load when inserting the piston into the cartridge.
  • the front guard also serves as additional centering of the piston to the cartridge. The more distant sealing lip has in contact with the edge of the cartridge to this only a small offset. The risk of damage to the sensitive flexible sealing lip is thereby minimized.
  • the front guard edge has an outer diameter which is slightly smaller than the inner diameter of the cartridge.
  • the diameter difference is about 1 mm, so that an annular gap with a width of about 0.5 mm around the front guard edge remains around.
  • This annular gap allows the escape of air from the product space of the cartridge.
  • the rear protective edge has an outer diameter which is at least equal to the inner diameter of the cartridge. The rear protective edge therefore strokes circumferentially touching the cartridge wall along. It has passages for the escape of air when putting the piston in the cartridge.
  • the invention is particularly applicable to cartridge piston with rigid piston breast.
  • cartridge pistons which have a so-called "membrane bottom".
  • the membrane bottom swings outward so that a piston breast bulges out to the front.
  • the release pressure on the cartridge piston decreases, the diaphragm bottom elastically returns to its original shape. As a result, the product is sucked back into the cartridge, so that dripping is prevented.
  • the piston 10 has a front piston breast 11 and a circumferential side wall 12.
  • the piston breast 11 forms the front end wall of the piston.
  • the side wall 12 is externally provided with rings 13 which may be formed like a sawtooth. The rings prevent extensive contact of the side wall 12 on the inner wall of the cartridge.
  • the interior of the piston 10 is hollow. From the piston breast 11, ribs 14 extend in the rearward direction. The rearward ends of the ribs 14 are approximately in a plane against which the plate of a (not shown) Auspresswerkmaschineschwes, which advances the piston in the cartridge body.
  • the front or inner sealing lip 20 is designed arcuate or cup-shaped, so that its diameter is larger towards the front end.
  • the outer sealing lip 21, which surrounds the sealing lip 20 at a radial distance, essentially represents an extension of the outer contour of the side wall 12. Its front end is slightly bent outward.
  • the two sealing lips 20 and 21 surround the constricted region 16.
  • the sealing lip 20 has circumferentially distributed openings 22 in the form of slots, which are arranged in the root area, ie near the shoulder 17.
  • the outer sealing lip 21 has openings 23 at its front edge.
  • the openings 22 of the sealing lip 20 and the openings 23 of the sealing lip 21 are arranged to each other in gap, d. H. they are not on a common radius.
  • a front protective edge 30 is new, which is provided in the transition between the region 16 and the piston breast 11 and forms an annular roof, which covers the sealing lip 20 at least partially when viewed in the axial direction of the piston.
  • the protective edge 30 casts an axial shadow, which radially covers a portion of the sealing lip 20, and possibly the sealing lip 21.
  • the entire cartridge piston is made in one piece from a plastic.
  • the sealing lips 20, 21 are so thin-walled that they have the flexibility required to stroke along the cartridge wall with radial pressure.
  • the protective edge 30, however, has a greater wall thickness, so that it is relatively rigid and it extends substantially radially outward.
  • the outer ends of the two sealing lips 20, 21 project approximately equidistant.
  • the protective edge 30 is back by a small amount.
  • the protective edge covers more than 20% of the radial height R 1 of a sealing lip, better more than 35%, more preferably more than 50% of the radial height R 1 of the sealing lip.
  • the piston breast 11 merges into the protective edge 30 in a continuous arc.
  • the protective edge 30 has, inter alia, the function of a deflector which, when setting the piston, directs the mass contained in the cartridge to the outside, while the central dome is deformed by the piston breast.
  • the airway from the piston breast remains open through the apertures 22 and 23 so that the air can escape on a meandering path to subsequently flow outwardly on the sidewall 12 to the rear.
  • the reduced diameter of the protective rim 30 is intended to facilitate the insertion of the piston into a cartridge and to pre-center the piston. Another reason is to let the air flow past the guard edge to the rear.
  • FIGS. 4 and 5 corresponds largely to the first embodiment, to which reference is made.
  • a rearwardly facing sealing lip 32 is provided on the side wall 12.
  • the piston is also suitable for a pneumatic extrusion tool, wherein the rear sealing lip 32 rests against the cartridge wall and seals the pressure chamber.
  • a rear protective edge 33 is formed on the side wall 12. This protective edge 33 is annular. It is also rigid and covers in axial projection a portion of the associated sealing lip 32. The two protective edges 30 and 33 cause the piston in the front and in the rear area along the cartridge wall is guided stable.
  • longitudinal grooves 36 are provided, which openings 38 open in the root region of the protective edge 33.
  • the purpose of the apertures 38 is to ensure a venting of the cartridge during the piston setting also for the case when the protective edge 33 bears tightly against the cartridge inner wall. Furthermore, compressed air can flow from a pneumatic extrusion tool through these openings and press the sealing lip behind it sealingly against the cartridge wall.
  • FIGS. 6 and 7 two front, forward facing sealing lips 20, 21 are provided, and two rear, rearwardly facing sealing lips 32, 34.
  • the front sealing lips 20, 21 are partially covered in axial projection from the front radial protection edge 30 and the rear sealing lips 32, 34th are partially covered by the rear axial protective edge 33 in axial projection.
  • the rear protective edge 33 has on the outside axial passages 37, which form air ducts through which the outside of the piston, which passes along the piston during piston setting, can escape to the rear.
  • FIG. 7 shows in the third embodiment, the relations between the cartridge piston and the inner surface of the cartridge.
  • the free ends of the sealing lips 20, 21 and 32, 34 are pressed inwardly by the cartridge wall.
  • the rear protective edge 33 strips along the inner surface 39 of the cartridge, while the front protective edge 30 maintains a distance a from the inner surface 39.
  • FIG. 8 shows the same piston structure as in the first embodiments, but with a diaphragm bottom 40 in the piston breast 11.
  • the diaphragm bottom 40 consists of a flexible annular bellows 41, the two film hinges 42, 43 and is shown in the drawing in the relaxed, folded state.
  • the piston of FIG. 8 has flexible sealing lips 20, 21 and in front of these a front protective edge 30.
  • FIG. 9 shows a longitudinal section through a cartridge 50 in combination with a cartridge piston 10.
  • the cartridge 50 has an elongated cylindrical cartridge body 51 which is closed at one end by an end wall 52.
  • an outlet pipe 53 with a thread for screwing on a nozzle.
  • the outlet port 53 is closed. It can be opened by severing its outer end.
  • the cartridge 50 includes an expulsible mass 55 that is filled through the rear opening 56 before the piston 10 is set.
  • the mass 55 forms a central dome 57 after filling, which is surrounded by an annular trench 58.
  • the front protective edge 30 prevents the premature closure of the piston edge for the escaping air.
  • the protective edge 30 acts a pre-centering of the piston when inserted into the cartridge 50 and a protection of the sealing lip 20 during storage and handling of the piston and during insertion of the piston in the cartridge.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Toys (AREA)
  • Valve Device For Special Equipments (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Coating Apparatus (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
EP09157743A 2008-04-12 2009-04-09 Piston à cartouche Active EP2108599B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09157743T PL2108599T3 (pl) 2008-04-12 2009-04-09 Tłoczek do nabojów

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202008005097U DE202008005097U1 (de) 2008-04-12 2008-04-12 Kartuschenkolben

Publications (2)

Publication Number Publication Date
EP2108599A1 true EP2108599A1 (fr) 2009-10-14
EP2108599B1 EP2108599B1 (fr) 2010-12-01

Family

ID=40888180

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09157743A Active EP2108599B1 (fr) 2008-04-12 2009-04-09 Piston à cartouche

Country Status (5)

Country Link
EP (1) EP2108599B1 (fr)
AT (1) ATE490198T1 (fr)
DE (2) DE202008005097U1 (fr)
ES (1) ES2357096T3 (fr)
PL (1) PL2108599T3 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2399846A3 (fr) * 2010-06-22 2012-01-18 Fischbach KG Kunststoff-Technik Piston à cartouche
EP2610012A1 (fr) * 2010-08-24 2013-07-03 Kaga Works Co. Ltd. Procédé de remplissage pour un matériau visqueux
NO334135B1 (no) * 2011-06-27 2013-12-16 Bjoernar Sjursen Ernæringsstomisystem og fremgangsmåte for å la en person med ernæringsstomi delta i et måltid
US9598223B2 (en) 2012-04-02 2017-03-21 Kaga Works Co., Ltd. Plunger for pneumatic dispenser
EP3366612A1 (fr) * 2017-02-28 2018-08-29 Fischbach KG Kunststoff-Technik Pistons pour cartouches
US10293361B2 (en) 2015-10-19 2019-05-21 Kaga Works Co., Ltd. Cartridge for viscous-material dispenser
US10479587B2 (en) 2014-08-25 2019-11-19 Kaga Works Co., Ltd. Cartridge for viscous-material dispenser

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021108642A1 (de) * 2021-04-07 2022-10-13 Ritter Gmbh Nachlaufender Kolben mit Stützlippe

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7627128U1 (de) * 1976-08-31 1977-01-20 Alcan Aluminiumwerke Gmbh, 3400 Goettingen Kolben vorzugsweise aus Kunststoff insbesondere für einen Massebehälter
DE3005855A1 (de) 1980-02-16 1981-08-20 Alfred Fischbach Kg Kunststoff-Spritzgusswerk, 5250 Engelskirchen Bodenverschluss fuer einen hohlzylindrischen strangpressbehaelter
DE3148490A1 (de) 1981-12-08 1983-07-07 Alfred Fischbach Kg Kunststoff-Spritzgusswerk, 5250 Engelskirchen Bodenverschluss fuer einen hohlzylindrischen strangpressbehaelter
DE8502083U1 (de) 1985-01-26 1986-05-28 Bramlage Gmbh, 2842 Lohne Behälter mit Auspreßkolben
DE20319464U1 (de) * 2002-12-10 2004-04-22 Topic, Anton Kolben für eine Kartusche zum Aufbewahren und Auspressen von pastösen Substanzen und Kartusche mit demselben
DE202005000531U1 (de) * 2005-01-14 2005-08-25 Topic, Anton Kolben für eine Kartusche zum Aufbewahren und Auspressen von pastösen Substanzen und Kartusche mit demselben
DE102006025873A1 (de) 2006-06-02 2007-12-06 Fischbach Kg Kunststoff-Technik Kartusche für auspressbare Massen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030643A (en) * 1975-12-11 1977-06-21 Voplex Corporation Contents-conserving plunger for cartridge
DE10006157B4 (de) * 2000-02-11 2005-02-10 Wella Ag Pumpspender mit einer Handpumpe und einem Kolben aus Kunststoff zum Entnehmen von Teilmengen eines flüssigen Produkts aus einem Behälter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7627128U1 (de) * 1976-08-31 1977-01-20 Alcan Aluminiumwerke Gmbh, 3400 Goettingen Kolben vorzugsweise aus Kunststoff insbesondere für einen Massebehälter
DE3005855A1 (de) 1980-02-16 1981-08-20 Alfred Fischbach Kg Kunststoff-Spritzgusswerk, 5250 Engelskirchen Bodenverschluss fuer einen hohlzylindrischen strangpressbehaelter
DE3148490A1 (de) 1981-12-08 1983-07-07 Alfred Fischbach Kg Kunststoff-Spritzgusswerk, 5250 Engelskirchen Bodenverschluss fuer einen hohlzylindrischen strangpressbehaelter
DE8502083U1 (de) 1985-01-26 1986-05-28 Bramlage Gmbh, 2842 Lohne Behälter mit Auspreßkolben
DE20319464U1 (de) * 2002-12-10 2004-04-22 Topic, Anton Kolben für eine Kartusche zum Aufbewahren und Auspressen von pastösen Substanzen und Kartusche mit demselben
DE202005000531U1 (de) * 2005-01-14 2005-08-25 Topic, Anton Kolben für eine Kartusche zum Aufbewahren und Auspressen von pastösen Substanzen und Kartusche mit demselben
DE102006025873A1 (de) 2006-06-02 2007-12-06 Fischbach Kg Kunststoff-Technik Kartusche für auspressbare Massen

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010048062B4 (de) 2010-06-22 2018-08-23 Fischbach Kg Kunststoff-Technik Kartuschenkolben
CN102407977A (zh) * 2010-06-22 2012-04-11 菲施巴赫塑料技术有限公司 一种料筒活塞
US8505785B2 (en) 2010-06-22 2013-08-13 Fischbach Kg Kunststoff Technik Cartridge piston
EP2399846A3 (fr) * 2010-06-22 2012-01-18 Fischbach KG Kunststoff-Technik Piston à cartouche
EP2610012A1 (fr) * 2010-08-24 2013-07-03 Kaga Works Co. Ltd. Procédé de remplissage pour un matériau visqueux
EP2610012A4 (fr) * 2010-08-24 2014-05-14 Kaga Works Co Ltd Procédé de remplissage pour un matériau visqueux
US9126702B2 (en) 2010-08-24 2015-09-08 Kaga Works Co., Ltd. Viscous-material filling method
US9340306B2 (en) 2010-08-24 2016-05-17 Kaga Works Co., Ltd. Viscous-material filling apparatus
EP3064282A1 (fr) * 2010-08-24 2016-09-07 Kaga Works Co. Ltd. Procédé de remplissage de matériau visqueux
US10336478B2 (en) 2010-08-24 2019-07-02 Kaga Works Co., Ltd. Viscous-material filling method
US9731846B2 (en) 2010-08-24 2017-08-15 Kaga Works Co., Ltd. Viscous-material filling method
NO334135B1 (no) * 2011-06-27 2013-12-16 Bjoernar Sjursen Ernæringsstomisystem og fremgangsmåte for å la en person med ernæringsstomi delta i et måltid
US9598223B2 (en) 2012-04-02 2017-03-21 Kaga Works Co., Ltd. Plunger for pneumatic dispenser
US10479587B2 (en) 2014-08-25 2019-11-19 Kaga Works Co., Ltd. Cartridge for viscous-material dispenser
US10293361B2 (en) 2015-10-19 2019-05-21 Kaga Works Co., Ltd. Cartridge for viscous-material dispenser
US10507487B2 (en) 2015-10-19 2019-12-17 Kaga Works Co., Ltd. Cartridge for viscous-material dispenser
EP3366612A1 (fr) * 2017-02-28 2018-08-29 Fischbach KG Kunststoff-Technik Pistons pour cartouches

Also Published As

Publication number Publication date
PL2108599T3 (pl) 2011-05-31
ES2357096T3 (es) 2011-04-18
ATE490198T1 (de) 2010-12-15
DE202008005097U1 (de) 2009-10-29
EP2108599B1 (fr) 2010-12-01
DE502009000202D1 (de) 2011-01-13

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