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WO1997018073A1 - Dispositif pour la fabrication de tubes - Google Patents

Dispositif pour la fabrication de tubes Download PDF

Info

Publication number
WO1997018073A1
WO1997018073A1 PCT/CH1996/000379 CH9600379W WO9718073A1 WO 1997018073 A1 WO1997018073 A1 WO 1997018073A1 CH 9600379 W CH9600379 W CH 9600379W WO 9718073 A1 WO9718073 A1 WO 9718073A1
Authority
WO
WIPO (PCT)
Prior art keywords
displacement
chamber
plastic
blank
tube
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.)
Ceased
Application number
PCT/CH1996/000379
Other languages
German (de)
English (en)
Inventor
Heinrich ÜBEREGGER
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.)
Combitool AG
Original Assignee
Combitool 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 Combitool AG filed Critical Combitool AG
Publication of WO1997018073A1 publication Critical patent/WO1997018073A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
    • B29C31/06—Feeding of the material to be moulded, e.g. into a mould cavity in measured doses, e.g. by weighting
    • B29C31/061—Feeding of the material to be moulded, e.g. into a mould cavity in measured doses, e.g. by weighting using stationary volumetric measuring chambers
    • B29C31/063—Feeding of the material to be moulded, e.g. into a mould cavity in measured doses, e.g. by weighting using stationary volumetric measuring chambers of the piston type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
    • B29C31/042—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds
    • B29C31/048—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds the material being severed at the dispensing head exit, e.g. as ring, drop or gob, and transported immediately into the mould, e.g. by gravity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2001/00—Articles provided with screw threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/20—Flexible squeeze tubes, e.g. for cosmetics

Definitions

  • the present invention relates to a device for producing tubes, in particular for producing a plastic blank for the tube head, for producing the tube head and for connecting the tube head to the tube, according to the preamble of patent claim 1.
  • Such devices are well known, for example from CH 638 716 A5, CH 652 966 A5 and DE 38 04 464 Cl.
  • the known devices essentially consist on the one hand of a mandrel which carries the prefabricated tube and the free end of which is designed as an inner part of the pressing tool of the tube head, and on the other hand of an external pressing mold for the tube head, thirdly of one Extrusion device, which forms an annular blank from the thermoplastic material from which the tube head is to be formed.
  • the devices of the publications mentioned differ in the manner in which this blank is introduced between the two parts of the press mold mentioned. Tubes are a mass product. In general, it can be assumed that their production is carried out on multi-station machines, mostly on rotary tables.
  • a known device is constructed in such a way that the mandrel with the pressing tool is vertically upwards under the extrusion device.
  • a ring-shaped part of the outer die forms the likewise ring-shaped blank from the extrusion tool in such a way that the blank remains stuck to the outer die until the other parts of the outer die are attached in the intended manner and the mentioned die is included prepared tube in the next - or possibly the next - work station and the blank is pressed together. In mass production, this process could not be carried out with the necessary Reliability can be reproduced, since the blank occasionally falls out of the external mold.
  • the device known from the document CH 638 716 mentioned is intended to improve this method - and the structure of the device.
  • the arrangement of the mandrel and the outer shape of the tube head is reversed such that the outer shape is now at the bottom.
  • the blank is shaped as a ring by an extruder, which is controlled by a pressure-time profile, and is conveyed downwards by an annular gas jet from the ring gap of the extruder into the external shape provided. This process has become known as "free fall technology".
  • the blank does not detach everywhere at the same time, which can lead to the blank lying crooked in the outer shape; if the pressing tool does not have a punch due to the type of tube head to be manufactured, the position of the annular blank, which is otherwise centered by the punch, is poorly defined. Furthermore, the blank is in the cooled outer shape until the pressing process, which takes place in the next machine station, which means that it is already locally solidified at the support points. This leads to aesthetically unsatisfactory results of the outer skin of the tube head or the shoulder.
  • the type of extrusion depends on the pressure exerted on the plastic and its temperature-dependent toughness. The latter in particular is a parameter that is difficult to maintain.
  • a solution is disclosed in DE 38 04 464 Cl, in which the annular gas flow for detaching the blank from the annular gap of the extruder is maintained, but the blank is placed on an intermediate carrier while avoiding the free fall and by withdrawing the intermediate carrier in the outer shape below. The blank can thus be positioned exactly.
  • the two other disadvantages namely those of the fluctuating quantity, remain. dosing of the blank and that of local cooling.
  • the object of the present invention is to provide a device with which - within the framework of the technique described - the blank can be precisely metered and positioned, while avoiding pre-cooled places on the outer skin of the tube head or shoulder.
  • Fig. 1 shows a first part of the device partially in section.
  • FIG. 2 shows the subject of FIG. 1 in a second working cycle.
  • FIG. 3 shows the subject of FIG. 1 in a third working cycle.
  • Fig. 4 shows a second part of the device.
  • a mandrel 1 which is designed at its upper free end as an inner compression mold 9 for the tube neck and shoulder, carries - in the working step shown - a prefabricated tube tube 2 which is clamped to the mandrel with a tube brake (not shown).
  • a tube brake (not shown).
  • Above the dome 1 there is an extrusion nozzle 3 with an annular gap 4, from which so much plastic can be extruded with the means shown in FIG. 4 that a blank, denoted by number 5, is produced, which in a next step leads to a tube neck and shoulder is formed and pressed simultaneously with the tube tube 2.
  • FIG. 2 shows the same part of the device as FIG. 1 after the knife 6 has been lowered.
  • FIG. 3 shows the next processing cycle of the tube to be produced: the tube tube 2 seated on the mandrel 1 is moved into a press mold 12, which presses the upper part of the mandrel 1 with the inner mold 9 into a corresponding outer mold 11 and then - with means not shown but known per se - presses on the mold 12, whereby the blank 5 is deformed to the tube head and shoulder on the one hand and on the other hand is connected to the tube tube 2.
  • Lines 10 for the cooling medium are also arranged in the outer mold 11 and the mold 12.
  • FIG. 4 shows the part of the device according to the invention omitted in FIGS. 1 and 2, the metering device.
  • a heating device 13 with schematically drawn heating medium lines 14 a multiply structured hollow body 15 connects to the extrusion nozzle 3.
  • a displacement member 22 is arranged to be longitudinally movable. It is divided into a displacement piston 23, to which a rod 24 with a closing valve piston 25 connects at the bottom; upward, the displacement element 22 continues into a plunger 26.
  • the upper edge of the displacement chamber and the lower edge of the displacement piston 23 then lie against each other and seal the displacement chamber 18 after the supply chamber 17 hm, where the valve piston 25 clears the passage between the displacement chamber 18 and the first intermediate chamber 19.
  • the downward stroke of the displacement member 22 from then essentially determines the amount of plastic emerging from the annular gap 4.
  • the displacement member 22 is then raised again by a device shown on the plunger 26 and only by a double arrow.
  • a lifting and pushing device is known per se and can be moved mechanically or hydraulically with respect to the frame 8.
  • the plastic blank 5 formed and adhering to the annular gap 4 is cut off as described by the annular knife 6 and placed on the inner mold 9.
  • the stroke of the plunger 26 the amount of plastic forming the blank 5 can be changed accordingly.
  • FIG. 5 A variation of the device according to the invention is shown in FIG. 5.
  • the mandrel with tube tube 2 already mentioned is positioned under the extrusion nozzle 3.
  • the latter has, for example, a round opening 27 from which a round strand 29 can also be pressed, using the device shown in FIG. 4.
  • This round strand 29 forms a drop 31 or is placed directly on the inner die 9.
  • An anti-stick knife 28 is then moved over the extrusion nozzle 3 and the round strand 29 is cut off at the opening 27 of the extrusion nozzle 3.
  • Numeral 30 denotes a schematically illustrated hydraulic cylinder with which the knife 28 can be moved.
  • other actuators are also known and possible.
  • a hot wire (not shown) can also be used, as is known per se in plastics processing.
  • the shaping of an annular blank 5 (according to FIG. 3) or a pill-shaped blank 32 formed from the drop 31 can be more advantageous.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Robotics (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Le dispositif selon l'invention comprend un mandrin dirigé vers le haut (1), dont l'extrémité supérieure est réalisée sous la forme d'une matrice de compression intérieure (9) pour la tête et l'épaulement du tube, ainsi qu'un dispositif de dosage pour l'extrusion de la quantité prévue de matière plastique servant à réaliser ultérieurement la tête et l'épaulement. Le dispositif de dosage présente un corps creux polystructuré (15), dans lequel un organe de refoulement (22) est déplaçable longitudinalement par l'intermédiaire d'une tige-poussoir (26). La structure du corps creux (15) est constituée par une chambre d'alimentation (17), une chambre de refoulement (18), une première chambre intermédiaire (19) et une deuxième chambre intermédiaire (21). A la deuxième chambre intermédiaire (21) est raccordée la buse d'extrusion (3) qui peut présenter, suivant la forme recherchée d'une ébauche en matière plastique à réaliser (5), un espace annulaire (4) ou une ouverture circulaire. La première chambre intermédiaire (19) est raccordée à la deuxième (21) par des ouvertures (20). L'organe de refoulement (22) porte la tige-poussoir (26), un piston de refoulement (23) et, sur le côté opposé à la tige-poussoir (26), une tige (24) qui se termine dans un piston à soupape (25). Par déplacement de la tige-poussoir (26), le piston de refoulement (23) fait sortir de la chambre de refoulement (18), par compression, la quantité voulue de matière plastique formant l'ébauche annulaire (5), ladite matière plastique étant expulsée dans l'espace annulaire, découpée par une lame annulaire déplacée verticalement (6) et amenée dans la matrice de compression intérieure (9). Durant le cycle opératoire suivant, l'ébauche (5) est configurée de manière à prendre la forme de la tête et de l'épaulement du tube et est compressée conjointement avec le corps du tube (2) fixé sur le mandrin (1).
PCT/CH1996/000379 1995-11-14 1996-10-28 Dispositif pour la fabrication de tubes Ceased WO1997018073A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH322195 1995-11-14
CH3221/95 1995-11-14

Publications (1)

Publication Number Publication Date
WO1997018073A1 true WO1997018073A1 (fr) 1997-05-22

Family

ID=4251265

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1996/000379 Ceased WO1997018073A1 (fr) 1995-11-14 1996-10-28 Dispositif pour la fabrication de tubes

Country Status (1)

Country Link
WO (1) WO1997018073A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997049545A1 (fr) * 1996-06-25 1997-12-31 Packtech Limited Procede pour fabriquer des tubes d'emballage
DE102012001504A1 (de) * 2012-01-27 2013-08-01 Saeta Gmbh & Co. Kg Vorrichtung und Verfahren zur Dosierung von in einem Extruder plastifizierter Dichtungsmasse
WO2015181668A1 (fr) 2014-05-29 2015-12-03 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa Procédé et appareil pour l'application de doses annulaires
WO2017137615A1 (fr) 2016-02-10 2017-08-17 Inovia Technologies Sa Dispositif de dosage en continu de matiere plastique notamment pour unite de production de composants en matiere plastique ou similaire
CN109278230A (zh) * 2018-08-06 2019-01-29 董田田 活塞环制造设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160690A (en) * 1961-08-14 1964-12-08 Owens Illinois Glass Co Method for making plastic articles
US3313875A (en) * 1961-04-19 1967-04-11 Magerle Karl Plastic forming process and apparatus
JPS5871118A (ja) * 1981-10-23 1983-04-27 Toshiba Mach Co Ltd 押出−プレス成形方法
EP0543771A1 (fr) * 1991-11-20 1993-05-26 Sulzer Chemtech AG Dispositif de coupe, pour une extrudeuse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313875A (en) * 1961-04-19 1967-04-11 Magerle Karl Plastic forming process and apparatus
US3160690A (en) * 1961-08-14 1964-12-08 Owens Illinois Glass Co Method for making plastic articles
JPS5871118A (ja) * 1981-10-23 1983-04-27 Toshiba Mach Co Ltd 押出−プレス成形方法
EP0543771A1 (fr) * 1991-11-20 1993-05-26 Sulzer Chemtech AG Dispositif de coupe, pour une extrudeuse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 165 (M - 230) 20 July 1958 (1958-07-20) *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997049545A1 (fr) * 1996-06-25 1997-12-31 Packtech Limited Procede pour fabriquer des tubes d'emballage
DE102012001504A1 (de) * 2012-01-27 2013-08-01 Saeta Gmbh & Co. Kg Vorrichtung und Verfahren zur Dosierung von in einem Extruder plastifizierter Dichtungsmasse
WO2015181668A1 (fr) 2014-05-29 2015-12-03 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa Procédé et appareil pour l'application de doses annulaires
CN106414012A (zh) * 2014-05-29 2017-02-15 萨克米伊莫拉机械合作社合作公司 用于施放环形成形物的方法及装置
JP2017517417A (ja) * 2014-05-29 2017-06-29 サチミ、コオペラティバ、メッカニーチ、イモラ、ソチエタ、コオペラティバＳａｃｍｉ Ｃｏｏｐｅｒａｔｉｖａ Ｍｅｃｃａｎｉｃｉ Ｉｍｏｌａ Ｓｏｃｉｅｔａ’ Ｃｏｏｐｅｒａｔｉｖａ 環状ドーズを適用するための方法及び装置
US20170239848A1 (en) * 2014-05-29 2017-08-24 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa Method and apparatus for applying annular doses
US10603820B2 (en) 2014-05-29 2020-03-31 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa Method and apparatus for applying annular doses
US10899043B2 (en) 2014-05-29 2021-01-26 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa Method and apparatus for applying annular doses
EP3148762B1 (fr) * 2014-05-29 2022-12-14 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa Procédé et appareil pour l'application de doses annulaires
WO2017137615A1 (fr) 2016-02-10 2017-08-17 Inovia Technologies Sa Dispositif de dosage en continu de matiere plastique notamment pour unite de production de composants en matiere plastique ou similaire
CN109278230A (zh) * 2018-08-06 2019-01-29 董田田 活塞环制造设备

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