WO2009111854A1 - Mécanisme de fermeture intégré au moule et son procédé - Google Patents

Mécanisme de fermeture intégré au moule et son procédé Download PDF

Info

Publication number
WO2009111854A1
WO2009111854A1 PCT/CA2008/000485 CA2008000485W WO2009111854A1 WO 2009111854 A1 WO2009111854 A1 WO 2009111854A1 CA 2008000485 W CA2008000485 W CA 2008000485W WO 2009111854 A1 WO2009111854 A1 WO 2009111854A1
Authority
WO
WIPO (PCT)
Prior art keywords
arm
lid
rotator
base
mold closing
Prior art date
Application number
PCT/CA2008/000485
Other languages
English (en)
Inventor
Ealias C. Joseph
Original Assignee
Stack Teck Systems Limited
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 Stack Teck Systems Limited filed Critical Stack Teck Systems Limited
Priority to PCT/CA2008/000485 priority Critical patent/WO2009111854A1/fr
Publication of WO2009111854A1 publication Critical patent/WO2009111854A1/fr

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
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/006—Joining parts moulded in separate cavities
    • 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
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/0055—Shaping
    • B29C2045/0056—Shaping folding back undercut forming parts, e.g. tabs of closures
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
    • B29L2031/565—Stoppers or lids for bottles, jars, or the like, e.g. closures for containers

Definitions

  • This invention relates generally to the field of plastics injection molding. More particularly, this invention relates to the closing of lids on injection molded parts before completely ejecting parts from a mold.
  • “Flip-top” closures are typically molded in an open configuration wherein a part and its lid are molded side by side, joined by a flexible or "living" hinge.
  • the lid be secured over a corresponding opening in the part as soon as possible after molding.
  • interlocking and sealing components on the part and its lid tend to mate better if allowed to cool together.
  • Another reason is to avoid damage to the part during packaging and shipping.
  • automated equipment for placing the part, which is typically a closure, over a container opening requires that the part be closed.
  • Previous in-mold closing arrangements have been relatively slow in action, limited to one to two rows of molded parts and obstructed the operator side of a molding machine. Previous in-mold closing arrangements have also tended to be heavy, imposing vibration and overhang weight problems on moving stripper plates.
  • a method for in-mold closing of a hinged lid molded in an injection mold integrally with but adjacent to a part comprising the steps of: (i) at least partially stripping said part and said lid from said mold to provide a space between said mold and said lid;
  • the arc is about an axis axially aligned with an axis of the hinge.
  • the lid engaging arm may be configured to simultaneously engage a plurality of lids set out in a row.
  • a plurality of the lid engaging arms may be employed and simultaneously actuate to simultaneously engage a plurality of the rows of lids.
  • An in-mold closing mechanism for a molding apparatus which produces a molded part having a lid hingedly attached thereto and rotatable about a hinge axis between an initial open configuration adjacent the part and a closed configuration covering an opening in the molded part and lockingly engaging the molded part.
  • the mechanism includes a base to which a rotator arm is mounted at a base end of the rotator arm.
  • the rotator arm is rotatable about an arm axis parallel to the hinge axis.
  • a lid engaging arm is attached to the rotator arm opposite the base end and configured to engage the Hd for moving the lid toward its closed configuration.
  • a translator is connected to the base to move the base and in turn the rotator arm between a deployed position wherein the lid engaging arm can engage the lid and a non- deployed position, clear of the lid to allow closure of the molding apparatus.
  • a rotator is connected to the rotator arm for rotating the arm about the arm axis.
  • the closing arm axis preferably substantially aligns with the hinge axis in the deployed position.
  • the rotator may comprise a toothed rack connected to a telescopic actuator for reciprocal movement thereby and pinion teeth attached to the rotator arm and meshing with the toothed rack to cause the rotator arm to rotate about the arm axis in response to reciprocal movement of the rack.
  • the rack may be slidably mounted on a rail which forms part of the translator.
  • the actuator may be a first fluid pressure actuated piston and cylinder arrangement connected to act between the rack and the translator.
  • the translator may comprise a second fluid pressure response of piston and cylinder arrangement acting between the rail and the molding apparatus.
  • the closing arm may extend between at least two of the rotator arms and service a plurality of lids.
  • the closing mechanism may have a plurality of rails with a plurality of the mechanisms mounted in rows thereon to service a molding apparatus having a multi-cavity mold which forms a plurality of lids simultaneously in a plurality of rows and columns.
  • the part may be a container closure.
  • Figure 1 is a front elevation of a multi-cavity cavity part of an injection molding mold incorporating an in-mold closing apparatus according to the present invention
  • Figure IA is a view corresponding to figure 1 but showing the in-mold closing apparatus on its own;
  • Figure 2 is a section through line B-B of Figure 1 illustrating part of a closing mechanism according to the present invention
  • Figure 3 is a section through line C-C of Figure 1 ;
  • Figure 4 is a side view of an in-mold closing mechanism according to the present invention in a mold open position
  • Figure 5 is a view corresponding to Figure 4 but showing the mechanism after rail movement
  • Figure 6 corresponds to Figures 4 and 5 but showing movement of a closing arm on the mechanism during closing;
  • Figure 7 is a section on line A-A of Figure 1 illustrating the mold in a closed configuration with a mold closing mechanism according to the present invention in the non-deployed position;
  • Figure 8 corresponds to Figure 7 but illustrates the mold in an open configuration with first stage ejection complete and the in-mold closing mechanism actuated;
  • Figure 9 corresponds to Figures 7 and 8 and illustrates the in- mold closing mechanism returned to its non-deployed position with a second stage of ejection complete.
  • An in-mold closing mechanism according to the present invention is generally indicated by reference 20 in the accompanying illustrations.
  • the in-mold closing mechanism 20 is shown in Figure 1 within the context of a core part 30 of an injection molding apparatus (reference 60 in Figure 7) having a plurality of mold cores 32 arranged in rows and columns and surrounded by a stripper plate 34.
  • each core 32 partially defines a part 40, which has a lid 42 hingedly attached to it for rotation about a respective hinge axis 44.
  • the balance of the part is defined by a mold cavity 52 which, as illustrated in Figure 7 is on a cavity part 50 of the molding apparatus.
  • the mold core 32 aligns with the mold cavity 52 to define the part 40 therebetween.
  • the core 32 is in three parts, an inner part 36 and an outer part
  • the inner part 36 and outer part 38 are telescopic relative to the middle sleeve 37.
  • This configuration enables the formation of a depending skirt 46 within the part 40 extending about an inwardly depending wall 48 defining a passage or opening 49 through the part 40.
  • the skirt 46 and wall 48 are respectively defined, during molding, between the middle sleeve 37, outer part 38 and the inner part 36 of the core 32.
  • Figure 7 illustrates the molding apparatus 60 in a mold closed configuration.
  • Figures 8 and 9 illustrate respectively first and second stages of part ejection in a mold open configuration.
  • the stripper plate 34 and middle sleeve 37 of the mold core 32 are simultaneously moved, upward as illustrated (laterally as it would be installed in most molding machines) to lift the part 40 out of and away from the outer part 38 and inner part 36.
  • the stripper plate 34 continues to move upwardly to lift the molded part 40 off of the middle sleeve 37 of the mold core 32. This completes ejection.
  • the part 40 has a Hd 42 hingedly attached to it.
  • the lid 42 When the part 40 is molded, the lid 42 is in an open configuration as illustrated in Figures 7 and 8.
  • the lid is movable about the hinge axis 44 to a closed configuration illustrated in Figure 9.
  • the lid 42 In the closed configuration the lid 42 extends over the opening 49.
  • a protuberance 47 extending from an inside face of the lid 42 is received in the opening 49 to releasably engage the wall 48 extending thereabout in a locking and sealing manner.
  • the protuberance has a lip 45 extending outwardly thereabout to effect the locking/sealing engagement.
  • the protuberance 47 may not be present in some lid designs and is not necessary for operation of the in-mold closing mechanism 20.
  • the in- mold closing mechanism 20 of the present invention closes the lid 42 before the part 40 is fully ejected from the mold.
  • the mechanism 20 has a base 70 slidably mounted to an elongate rail 74.
  • the rail 74 is in turn rigidly mounted to the ejector plate 34.
  • pinion housings 72 Extending upwardly from the base 70 and spaced apart along its length are pinion housings 72.
  • the pinion housings 72 support a rotatable shaft 80.
  • a rotator arm 90 and a pinion 100 To rotatable shaft 80 are mounted, for co-rotation therewith, a rotator arm 90 and a pinion 100.
  • the mounting may be by any suitable means including, without limitation, keying, splines or being machined as an integral assembly.
  • the rotator arm 90 attaches to the shaft 80 at a base end 92 and rotates about an arm axis 94 which coincides with the axis of the shaft 80. It should be borne in mind that this is but one mounting arrangement. Alternatives may be apparent to persons of ordinary skill in mechanical structures. For example, while the rotator arm 90 and pinion 100 are shown in the illustrations as being rigidly secured to the shaft 80, as an alternative the rotator arm 90 and pinion 100 may be rotatable about the shaft 80 and rotationally coupled to each other by means other than the shaft 80, such as for example, by being co-machined or having mating dogs and recesses.
  • the rotator arm 90 has a lid engaging arm 110 attached to it opposite its base end 92.
  • the lid engaging arm 110 is shaped or configured in such a way as to engage the lid 42, when the mechanism 20 is in a deployed position as discussed in more detail below.
  • a single lid engaging arm 110 may service a single lid 42 or a row of lids 42.
  • a plurality of lid engaging arms 110 may be used, each extending between and carried by a pair of rotator arms 90 and servicing all or part of a row of lids.
  • the Hd engaging arms are accommodated in recesses 102 in the mold cavity 32 so as not to interfere with mold closing and part molding.
  • the stripper plate 34 advances in a machine direction (up as illustrated in Figures 7-9) away from the cores 32.
  • the mechanism 20 advances with the stripper plate 34 by virtue of being mounted thereon. This initial movement, or first stage of ejection, lifts the lid engaging arm(s) 110 out of the recesses 102.
  • a first hydraulic cylinder 120 is mounted to act between the stripper plate 34 and the base 70 to move the base 70 to the left and right as illustrated in Figures 1, 4-9. In this manner the first hydraulic cylinder 120 acts as a "translator” by causing translation or movement of the base along the rails 74 mounted to the stripper plate 34.
  • Other translator means might be apparent to persons of relevant skill such as cam and follower, screw drives or crank arrangements.
  • the base 70 is then moved to the left as illustrated for the lid engaging arm 110 to move from an initial, non-deployed position (to the right) to a deployed position under the lid 42 (to the left).
  • the rotator arm 90 is then caused to rotate, in a manner described in more detail below, to cause the lid engaging arm 110 to travel in an arc anti-clockwise (as illustrated). As shown in Figure 8, this causes the lid engaging arm 110 to urge the lid 42 from its open to its closed configuration.
  • a rotator in the form of pinion 100 and a rack 112 which meshes therewith is used to rotate the rotator arm 90.
  • Other mechanisms might be substitutable therefor however the rack and pinion arrangement is sturdy, compact and robust.
  • the rack 112 In order to rotate the pinion 100, the rack 112 is advanced along the base 72. Movement of the rack 112 may be effected by a second hydraulic cylinder 130 acting between the rack 112 and the base 70. Other solutions might be feasible for moving the rack 112 such as perhaps a screw arrangement or a pneumatic cylinder.
  • a plurality of racks 112 may be connected to a common rack connecting member 114 for simultaneous movement by the second hydraulic cylinder 130.
  • a plurality of bases may be connected to a common base connecting member 116 for simultaneous movement by the first cylinder 120.
  • the arm axis 94 will align axially with the hinge axis
  • rollers 140 may be provided about the lid engaging arm 110 to further cushion closing.
  • the rollers 140 may for example be of polyurethane or other suitable material.

Landscapes

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

Abstract

L’invention concerne un mécanisme de fermeture intégré au moule pour appareil de moulage produisant une pièce moulée possédant un couvercle fixé de manière articulée à celui-ci et rotatif sur un axe d'articulation entre une configuration ouverte initiale adjacente à la pièce et une configuration fermée recouvrant une ouverture dans la pièce moulée et s’engageant par verrouillage dans la pièce moulée. Le mécanisme comporte un socle sur lequel un bras rotatif est monté au niveau d'une extrémité côté socle du bras rotatif. Le bras rotatif est rotatif sur un axe de bras parallèle à l’axe d’articulation. Un bras d’engagement dans le couvercle est fixé au bras rotatif à l'opposé de l’extrémité côté socle et configuré pour s'engager dans le couvercle afin de déplacer le couvercle vers sa configuration fermée. Un système de translation est connecté au socle pour déplacer le socle et par conséquent le bras rotatif entre une position déployée dans laquelle le bras d’engagement dans le couvercle peut s’engager dans le couvercle et une position non déployée, écartée du couvercle pour permettre la fermeture de l’appareil de moulage. Un rotateur est connecté au bras rotatif pour faire tourner le bras sur son axe.
PCT/CA2008/000485 2008-03-12 2008-03-12 Mécanisme de fermeture intégré au moule et son procédé WO2009111854A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CA2008/000485 WO2009111854A1 (fr) 2008-03-12 2008-03-12 Mécanisme de fermeture intégré au moule et son procédé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA2008/000485 WO2009111854A1 (fr) 2008-03-12 2008-03-12 Mécanisme de fermeture intégré au moule et son procédé

Publications (1)

Publication Number Publication Date
WO2009111854A1 true WO2009111854A1 (fr) 2009-09-17

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016141461A1 (fr) * 2015-03-12 2016-09-15 Husky Injection Molding Systems Ltd. Moule à injection ayant un dispositif de fermeture de couvercle dans le moule
EP3281759A1 (fr) * 2016-08-10 2018-02-14 ITC Packaging, S.L.U. Procédé de fabrication de joints pour emballage par injection dans un moule
IT201700104124A1 (it) * 2017-09-18 2019-03-18 Ermo apparato associato ad una pressa ad iniezione
EP3546170A1 (fr) * 2018-03-28 2019-10-02 3M Innovative Properties Company Procédé de formation d'un couvercle à dessus rabattable et couvercle à dessus rabattable
WO2019209335A1 (fr) 2018-04-27 2019-10-31 Nypromold Inc. Appareil pneumatique de fermeture de couvercle dans le moule
US20210399543A1 (en) * 2018-06-13 2021-12-23 Nypromold Inc. In-mold lid closing apparatus

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4040595A (en) * 1976-08-09 1977-08-09 Weatherchem Corporation Injection molding machine
US4340352A (en) * 1980-12-31 1982-07-20 Global Precision Inc. Hinge exercising mechanism
US4351630A (en) * 1980-12-31 1982-09-28 Global Precision Inc. Pivoting hinge exercising mechanism
US5906841A (en) * 1996-11-19 1999-05-25 Marland Mold, Inc. Mold for a closure cap
US20040222559A1 (en) * 2003-05-07 2004-11-11 Gomes Manuel J. In mold closing mechanism
US20050271765A1 (en) * 2002-11-05 2005-12-08 Vanderploeg James A Side shuttle apparatus and method for an injection molding machine
CA2511640A1 (fr) * 2004-07-12 2006-01-12 Polytop Corporation Flacon a capsule a charniere et methode de fabrication
US20060033238A1 (en) * 2001-11-19 2006-02-16 Gram Technology Aps Tool with closing mechanism and method of manufacturing preferably plastic parts with hinges
CA2505962A1 (fr) * 2005-05-02 2006-11-02 Stackteck Systems Limited Dispositif de fermeture de moule
CA2495719C (fr) * 2002-09-13 2008-03-18 Husky Injection Molding Systems Ltd. Dispositif et procede pour refermer une piece moulee articulee

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4040595A (en) * 1976-08-09 1977-08-09 Weatherchem Corporation Injection molding machine
US4340352A (en) * 1980-12-31 1982-07-20 Global Precision Inc. Hinge exercising mechanism
US4351630A (en) * 1980-12-31 1982-09-28 Global Precision Inc. Pivoting hinge exercising mechanism
US5906841A (en) * 1996-11-19 1999-05-25 Marland Mold, Inc. Mold for a closure cap
US20060033238A1 (en) * 2001-11-19 2006-02-16 Gram Technology Aps Tool with closing mechanism and method of manufacturing preferably plastic parts with hinges
CA2495719C (fr) * 2002-09-13 2008-03-18 Husky Injection Molding Systems Ltd. Dispositif et procede pour refermer une piece moulee articulee
US20050271765A1 (en) * 2002-11-05 2005-12-08 Vanderploeg James A Side shuttle apparatus and method for an injection molding machine
US20040222559A1 (en) * 2003-05-07 2004-11-11 Gomes Manuel J. In mold closing mechanism
CA2511640A1 (fr) * 2004-07-12 2006-01-12 Polytop Corporation Flacon a capsule a charniere et methode de fabrication
CA2505962A1 (fr) * 2005-05-02 2006-11-02 Stackteck Systems Limited Dispositif de fermeture de moule

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3268204B1 (fr) * 2015-03-12 2020-09-16 Husky Injection Molding Systems Ltd. Moule à injection ayant un dispositif de fermeture de couvercle dans le moule
CN107530931A (zh) * 2015-03-12 2018-01-02 赫斯基注塑系统有限公司 具有模具内盖子闭合装置的注塑模具
WO2016141461A1 (fr) * 2015-03-12 2016-09-15 Husky Injection Molding Systems Ltd. Moule à injection ayant un dispositif de fermeture de couvercle dans le moule
US10926443B2 (en) 2015-03-12 2021-02-23 Husky Injection Molding Systems Ltd. Injection mold having an in-mold lid closing device
EP3281759A1 (fr) * 2016-08-10 2018-02-14 ITC Packaging, S.L.U. Procédé de fabrication de joints pour emballage par injection dans un moule
IT201700104124A1 (it) * 2017-09-18 2019-03-18 Ermo apparato associato ad una pressa ad iniezione
WO2019053292A1 (fr) * 2017-09-18 2019-03-21 Ermo Appareil associe a une presse d'injection
WO2019186327A1 (fr) * 2018-03-28 2019-10-03 3M Innovative Properties Company Procédé de formation d'un capuchon rabattable, et capuchon rabattable
EP3546170A1 (fr) * 2018-03-28 2019-10-02 3M Innovative Properties Company Procédé de formation d'un couvercle à dessus rabattable et couvercle à dessus rabattable
WO2019209335A1 (fr) 2018-04-27 2019-10-31 Nypromold Inc. Appareil pneumatique de fermeture de couvercle dans le moule
EP3784467A4 (fr) * 2018-04-27 2021-10-27 Nypromold Inc. Appareil pneumatique de fermeture de couvercle dans le moule
US11613058B2 (en) 2018-04-27 2023-03-28 Nypromold, Inc. Pneumatic in-mold lid closing apparatus
US20210399543A1 (en) * 2018-06-13 2021-12-23 Nypromold Inc. In-mold lid closing apparatus

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