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WO1992001546A1 - Conteneur thermoplastique moule par injection et procedes de fabrication d'un tel conteneur - Google Patents

Conteneur thermoplastique moule par injection et procedes de fabrication d'un tel conteneur Download PDF

Info

Publication number
WO1992001546A1
WO1992001546A1 PCT/SE1991/000314 SE9100314W WO9201546A1 WO 1992001546 A1 WO1992001546 A1 WO 1992001546A1 SE 9100314 W SE9100314 W SE 9100314W WO 9201546 A1 WO9201546 A1 WO 9201546A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
mould
body portion
threaded portion
mandrel
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/SE1991/000314
Other languages
English (en)
Inventor
Hans Linner
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.)
Norden Pac Development AB
Original Assignee
Norden Pac Development AB
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 Norden Pac Development AB filed Critical Norden Pac Development AB
Publication of WO1992001546A1 publication Critical patent/WO1992001546A1/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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/44—Removing or ejecting moulded articles for undercut articles
    • B29C45/4407—Removing or ejecting moulded articles for undercut articles by flexible movement of undercut portions of the articles
    • 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

Definitions

  • the present invention relates to an injection-moulded thermoplastic container according to the preamble of claim 1 and to methods for its production according to the preambles of claims 6 and 8 respectively.
  • Containers of this type are typically assembled from at least two parts, that is, a substantially tubular body portion and a head-piece upon which screw threads are located for cooperation with a closure cap.
  • the pre-moulded tubular body portion is introduced into a mould wherein the head ⁇ piece is injection-moulded onto the body portion.
  • the head ⁇ piece is typically of thicker material than the body and comprises a threaded portion for locating a closure cap.
  • the threads of the threaded portion have a pointed profile and may be angled towards the base of the container.
  • a container body portion is moulded simutaneously with a threaded head-piece in a separate split-mould.
  • the split-mould is then opened and the united body portion and head-piecer is extruded by the introduction of a new batch of material into the apparatus.
  • a combined body portion and head-piece which can be axially withdrawn from the head-piece mould is described in CA-A- 691 156.
  • the head-piece of the container is first formed in a head-piece mould and the tubular body portion is then formed threon through extrusion. Once the desired length of the body portion has been reached, the extrusion process ceases and the head-piece end of the container is pushed from its mould.
  • the threaded portion of the head-piece is given a frustro-conical shape so as to aid the deformation of the head-piece to facilitate the axial ejection of the container from the head-piece mould.
  • a major disadvantage with the above-described process is the need for complex machinery. Furthermore, the axial force required to eject the container from the head-piece mould is high since the threads are shaped such that they cause deformation of the wall of the head-piece to allow its withdrawal.
  • the object of the invention is thus to provide a container and methods for its production which overcome the problems mentioned above.
  • the claimed characteristics of the container allow it to be moulded in one piece and axially withdrawn after moulding, without the need for screwing or split-moulds. Furthermore, the provision of a rounded thread profile reduces the frictional force tending to retain the threaded portion in its mould, thereby allowing a lower axial withdrawal force to be used. Clearly, this reduces the danger of damaging the threads during withdrawal.
  • a container according to the invention may also have a head-piece moulded onto the body portion with the threaded portion being on the head-piece.
  • the dimensions of the head-piece and body portion are likewise chosen such that this thus formed container may similarly be axially withdrawn from the mould.
  • theaded portion is provided on the tubular body portion itself.
  • a container having a wide opening can be produced in which the end wall remote from the threaded portion is moulded simultaneously with the tubular body portion.
  • the provision of a simultaneously moulded end wall means that there is absolutely no danger of leakage from, or into, the container at the junction between the end wall and the tubular body portion, a problem which has affected prior art containers in which an end wall is later heat- sealed to the tubular body portion.
  • a further advantage of this type of container is that its wall thickness i substantially uniform about the entire container.
  • Fig. 1 is a sectional view through a container according to the invention with a cooperating cap
  • Fig. 2 is a sectional view through a container according to the invention in which the cap portion -is externally threaded
  • Fig. 3 is a schematic sectional view of a mould assembly for the production of a container according to the invention
  • Fig. 4 is a perspective view of a container according to a further embodiment of the present invention.
  • reference numeral 1 denotes a thermoplastic container according to the invention.
  • the container comprises a substantially tubular body portion 2 with an end wall 3 and a cap portion 4.
  • upper region 5 of the body portion 2 is provided with integrally moulded screw-threads 6.
  • the wall thickness, length and diameter of the body portion 2 are chosen to allow a certain degree of flexing of the body portion 2 to permit its axial withdrawal from an injection-moulding machine.
  • the axial withdrawal is greatly facilitated by the provision of a rounded thread profile, as clearly seen from the figures.
  • a container according to the invention can have a body length of 50 mm, a diameter of 25 mm and a wall thickness of less than 1 mm.
  • a cap for use of such a container naturally has the same diameter of 25 mm and may have a length of 25 mm. Clearly these dimensions depend on the type of material used.
  • the tubular body portion 2 is provided with a head-piece 13 which is moulded onto the preformed body portion.
  • the head ⁇ piece 13 is of smaller diameter than the body portion at a region in which an outlet for the contents of the container is situated.
  • the threaded portion 5 instead of being located on the tubular body portion 2, is in this case located on the head-piece 13.
  • the threads have a rounded profile and the length, diameter and wall thickness parameters relating to the head-piece 13 are chosen such that the container can still be axially withdrawn from its mould assembly.
  • Fig. 3 shows a schematic view of a mould assembly for producing a container according to the present invention.
  • Reference numeral 7 denotes a mould having a rounded thread profile formed at a region 8 thereof.
  • Said mould 7 is provided with a passageway 10 for the introduction of molten thermoplastic material.
  • Reference numeral 9 denotes a mandrel which is introduced into the mould 7 to a position in which a gap of substantially constant thickness is left between it and the mould wall. This gap corresponds to the container to be moulded.
  • the open end of the mould is sealed by a plate 11 or similar so that injection of molten material can take place.
  • the moulded container is cooled by not shown cooling means, for example with the aid of cooling passages in the mould, to a desired temperature.
  • the moulded container shrinks somewhat.
  • Said desired temperature is chosen such that a predetermined amount of shrinkage of the container is achieved whilst the container also possesses sufficient flexibility to be axially removed from the mould. So that the threads on the container will not be damaged by the mould assembly during axial removal, the container material must have solidified sufficiently.
  • the desired temperature is naturally dependent on the choice of material, the dimensions of the container and the size of the thread profile. The fact that the thread profile is rounded means that a greatly reduced frictional force results during the axial withdrawal.
  • the mandrel 9 and sealing plate 11 are moved away from the mould 7 and the container is ejected from the mould 7 by ejection means 12.
  • ejection means 12 Although a mechanical pusher is shown in Fig. 3, it is clear that any suitable type of ejecting means, such as pneumatic means, may be used.
  • the container is withdrawn from the mould 7 at a temperature at which it is sufficiently flexible and because it has a thread profile which least resists axial displacement, the container can be removed from the mould by the exertion of solely an axial force, i.e. without the need for complicated screwing machinery or split moulds.
  • the mould assembly consists of a smooth-walled mould and a mandrel with the desired thread profile therein.
  • the corresponding cap-portion 4 can be produced in a similar mould assembly so that a cooperating threaded portion is achieved.
  • the axial withdrawal method may be applied to any substanially tubular elongated object having a threaded portion.
  • examples of such objects include low pressure pipes and flexible tubing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Closures For Containers (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

Conteneur (1) thermoplastique moulé par injection, comprenant une paroi d'extrémité (3), une partie de corps (2) tubulaire, et une partie filetée (5) éloignée de la partie d'extrémité (3) qui reçoit un chapeau (4) ayant des filetages mutuellement concourants, dans lequel les filetages (6) sont arrondis, par conséquent la partie filetée (5) recevant le chapeau (4) se situe sur la partie de corps tubulaire (2) et l'épaisseur de la paroi, le diamètre interne et la longueur axiale de ladite partie de corps tubulaire sont choisis de manière que la partie filetée (5) puisse s'infléchir suffisamment pour permettre le démoulage axial du conteneur (1) d'une machine à moulage par injection sans qu'aucun moment de torsion ne s'exerce sur le conteneur et sans qu'il soit nécessaire de séparer le moule en deux parties. L'invention concerne également des procédés de fabrication d'un conteneur de ce type.
PCT/SE1991/000314 1990-07-16 1991-05-02 Conteneur thermoplastique moule par injection et procedes de fabrication d'un tel conteneur Ceased WO1992001546A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9002442A SE9002442D0 (sv) 1990-07-16 1990-07-16 Injection thermoplastic container and methods for producing the same
SE9002442-3 1990-07-16

Publications (1)

Publication Number Publication Date
WO1992001546A1 true WO1992001546A1 (fr) 1992-02-06

Family

ID=20380008

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000314 Ceased WO1992001546A1 (fr) 1990-07-16 1991-05-02 Conteneur thermoplastique moule par injection et procedes de fabrication d'un tel conteneur

Country Status (4)

Country Link
JP (1) JPH0473121A (fr)
AU (1) AU7996591A (fr)
SE (1) SE9002442D0 (fr)
WO (1) WO1992001546A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6059356A (en) * 1997-09-05 2000-05-09 Daimlerchrysler Ag Two part roof arrangement
US6213666B1 (en) * 1995-05-24 2001-04-10 Merz & Krell Gmbh & Co. Production of releasable sleeve sections
LU90796B1 (en) * 2001-06-27 2002-12-30 Delphi Tech Inc Process for injection moulding a connection pipe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2568983B2 (ja) * 1994-04-12 1997-01-08 信号器材株式会社 背面入射光方式による高輝度図柄発光表示装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB795154A (en) * 1954-12-28 1958-05-14 Tuboplast Sa Thermoplastic container
FR1345603A (fr) * 1962-08-31 1963-12-13 Unilever Nv Dispositif et procédés pour la fabrication de récipients
CA691156A (en) * 1964-07-21 Guignard Boris Production of containers of plastic material
US3260410A (en) * 1962-11-13 1966-07-12 American Can Co Collapsible container structure
FR2596699A1 (fr) * 1986-04-08 1987-10-09 Miellet Albert Procede de fabrication de tubes de conditionnement et installation de mise en oeuvre dudit procede

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA691156A (en) * 1964-07-21 Guignard Boris Production of containers of plastic material
GB795154A (en) * 1954-12-28 1958-05-14 Tuboplast Sa Thermoplastic container
FR1345603A (fr) * 1962-08-31 1963-12-13 Unilever Nv Dispositif et procédés pour la fabrication de récipients
US3260410A (en) * 1962-11-13 1966-07-12 American Can Co Collapsible container structure
FR2596699A1 (fr) * 1986-04-08 1987-10-09 Miellet Albert Procede de fabrication de tubes de conditionnement et installation de mise en oeuvre dudit procede

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6213666B1 (en) * 1995-05-24 2001-04-10 Merz & Krell Gmbh & Co. Production of releasable sleeve sections
US6059356A (en) * 1997-09-05 2000-05-09 Daimlerchrysler Ag Two part roof arrangement
LU90796B1 (en) * 2001-06-27 2002-12-30 Delphi Tech Inc Process for injection moulding a connection pipe
EP1270169A1 (fr) * 2001-06-27 2003-01-02 Delphi Technologies, Inc. Procédé pour la moulage par injection d'une tube

Also Published As

Publication number Publication date
SE9002442D0 (sv) 1990-07-16
JPH0473121A (ja) 1992-03-09
AU7996591A (en) 1992-02-18

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