WO2005084915A1 - Dispositif de conditionnement d'objets en plastique et procede de conditionnement respectif - Google Patents

Dispositif de conditionnement d'objets en plastique et procede de conditionnement respectif Download PDF

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Publication number
WO2005084915A1
WO2005084915A1 PCT/EP2005/050893 EP2005050893W WO2005084915A1 WO 2005084915 A1 WO2005084915 A1 WO 2005084915A1 EP 2005050893 W EP2005050893 W EP 2005050893W WO 2005084915 A1 WO2005084915 A1 WO 2005084915A1
Authority
WO
WIPO (PCT)
Prior art keywords
conditioning
face
rotating
cavities
mould
Prior art date
Application number
PCT/EP2005/050893
Other languages
English (en)
Inventor
Matteo Zoppas
Massimo Coran
Original Assignee
S.I.P.A. Società Industrializzazione Progettazione E Automazione S.P.A.
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 S.I.P.A. Società Industrializzazione Progettazione E Automazione S.P.A. filed Critical S.I.P.A. Società Industrializzazione Progettazione E Automazione S.P.A.
Publication of WO2005084915A1 publication Critical patent/WO2005084915A1/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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded articles
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16—Cooling
    • B29C2035/1616—Cooling using liquids
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded articles
    • B29C2045/7214—Preform carriers for cooling preforms
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42051—Means for stripping, aligning or de-stacking
    • B29C49/42053—Stripping preforms from moulds, e.g. from injection moulds or cores
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6427—Cooling of preforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/258—Tubular

Definitions

  • the invention refers to a rotating conditioning device for plastic objects, for conditioning them outside the mould.
  • plastic objects may be in particular «pre-forms» or «parisons» which are later transformed into containers, especially bottles or plastic pots, by means of a further blowing operation.
  • plastics such as PET (polyethylene terephthalate) are widely used. Though these containers may be of various types, for example bottles, pots, phials, they will be indicated here generally with the name bottles, which represents the containers most used.
  • the preforms are obtained with different processes, for example by injection moulding, by extrusion combined with other hot-moulding operations, etc.
  • the preforms obtained for example by injection moulding generally using moulds with a large number of moulding cavities, are cooled and kept in an intermediate storage place at environment temperature.
  • the blowing operation is performed later, after heating to make the preforms sufficiently plastic.
  • the sliding plate is extracted from the mould and positioned vertically on a rotating turret, on each of the two faces of which is arranged a plurality of cooling cups, of the type described for example in the application for patent WO02/074518.
  • the preforms are let fall into the cooling cups of one of the two faces of the rotating turret, when they can continue cooling, outside the injection mould, until the desired temperature is reached.
  • An important aim of the present invention is to provide a rotating device for conditioning plastic objects and a respective conditioning method, for increasing the cycle time of a moulding station by carrying out part of the cooling of the moulded objects outside the extraction mould, which are an improvement on the methods of the prior art, in particular with respect to the devices and methods described in patent EP 1252007.
  • Another aim of the present invention is to provide an alternative rotating conditioning device which has a simpler and more economic construction and which maintains a characteristic of modularity that allows it to be used also on existing moulding systems.
  • a further aim of the present invention is to provide a conditioning device which produces preforms of better quality, eliminating an element of additional handling, and which achieves a better production efficiency.
  • the aims described above are achieved with a conditioning method for plastic objects having the characteristics according to claim 8. Thanks to the configuration of the device in the invention, preforms may be produced in shorter sequences, of better quality because the amount of handling to which they are subjected is reduced, handling which often causes scratching or other types of damage. Moreover the greater compactness of the cooling cups, which may be arranged on a rotating turret, allows preforms to be made with a larger diameter while the overall bulk of the turret remains the same.
  • Figure 1 shows an overhead view of a device according to the invention
  • Figure 2 shows a side view of the device in Figure 1
  • Figure 3 shows another side view of the device in Figure 1
  • Figure 4 shows a section along the plain A-A of the device in Figure 1
  • Figure 5 shows an enlargement of detail B in Figure 4.
  • Figure 1 shows a rotating device for conditioning plastic objects that are substantially oblong, in particular preforms of PET with which to obtain, in a subsequent blow-moulding operation, bottles, jars, phials or other types of containers, in a preferred embodiment of the present invention.
  • This rotating conditioning device referred to below in the description also as rotating turret, is indicated globally with the reference 20. Generally, but not necessarily, it is used for cooling preforms.
  • box-shaped element substantially in the form of a parallelepiped with two faces A and B opposed to each other, with a surface area greater than that of other faces, and comprises a plurality of housing bodies 21 , more or less tubular in shape, or anyway hollow, and indicated also, in this description, as «cooling cups» 21.
  • the cooling cups 21 are fixed onto a suitable frame or supporting body 10, forming a box-like structure, aligned in two spatial directions, horizontal and vertical, and arranged in rows and in columns so as to form a grid of square links.
  • the inside of the cups forms a suitable seat 22 for housing the preforms, in which they are inserted through the opening 23.
  • the conditioning cups 22 are arranged in such a way that each cup with opening on face B is coaxial with a cup with opening on face A, thus defining coaxial pairs of cups.
  • the bottom of the cups in each coaxial pair is arranged facing and adjacent so as not to leave any spaces between them, or to leave only the minimum space indispensable to arrange the elements that are indispensable to perform determined functions.
  • pairs of cups on the opposite faces may also be slightly offset, though remaining with the bottoms of the cups, of each pair, very close to each other.
  • the overall external height of the rotating turret is smaller, so that the turret may be introduced directly between the two open halves of a mould, mounted on a press for moulding preforms, instead of having to use an intermediate sliding support thin enough to be inserted between the two open half- moulds.
  • the cooling cycle time may therefore be reduced, since the transfer operation from an intermediate support to the cooling turret is avoided, and this also avoids leaving the preforms for a determined period on a non-conditioned intermediate support.
  • the cooling seats 22 are made in housing cups 21 with a relatively simple geometry, for example without shells, cavities or internal cooling ducts, and all the housing bodies 21 are placed in a casing composed of two metal front plates 24, 25 and of side plates 26, welded and/or screwed together so as to form a caisson; only the open ends of the cups 21 protrude from this caisson, just enough for the cups to be gripped by known extraction devices, not illustrated in the Figures.
  • the space inside the caisson, between the outside walls 24, 25, 26 and the cooling cups, may be filled or passed through by a cooling liquid so as to cool the preforms inserted in the various cooling seats 22.
  • the rotating turret 20 is also provided with suitable means for holding the preforms, suited for blocking the preforms and holding them in their cooling seats 22 when the seats are facing downwards.
  • this preform holding system is achieved with a system of ducts 29 connected to a pneumatic circuit: to hold a preform in a cooling seat 22 in the ducts 29, a pneumatic vacuum is generated, while to command or at least facilitate the expulsion of the preform, compressed air is blown into the ducts 29.
  • a manifold 30 is provided in the central area of the turret, the function of which is to allow the circulation of compressed air or to produce a vacuum inside the cups.
  • the rotating support 20 may be provided with holding and extraction systems of a different type, for example mechanical blocking systems, which may or may not be combined with pneumatic means, not shown in the Figures.
  • a first preferred example of operation of the rotating turret 20 described above will now be presented, together with further characteristics of the construction and operation of a cooling station, or more generally a conditioning station, indicated globally with the reference 100, on which the turret is mounted.
  • the rotating turret is mounted on a suitable metal frame so as to be able to slide horizontally and to rotate - substantially by about 180° - around an axis of rotation X, also horizontal, so as to tip and turn alternatively the first or the second face A, B upwards or downwards or, in other embodiments, towards another predetermined direction.
  • the rotating turret 20 assumes a first preform loading position, between the open halves of a mould, mounted on an injection moulding press, so as to be under the upper half-mould.
  • a predefined group of N preforms obtained with one moulding operation, is dropped from the half-mould into N cooling seats 22.
  • Both the support 20 and the mould are made in such a way that on the vertical plane of a moulding shell of the mould there is a seat 22 of the support.
  • the group of N preforms is let fall into the seats 22 of the rotating turret 20, filling rows of cups 21 according to a predetermined filling sequence which depends on the production rate chosen for the moulding system.
  • the turret is extracted from the mould, by means of a traverse movement, so as to be able to close the mould and perform another moulding cycle of N preforms as soon as the space between the half-moulds is freed from the turret.
  • the turret 20 is again inserted between the two open half-moulds under the top half-mould, and the second group of N moulded preforms is let fall onto the support 20 so as to fill other rows of empty cups 21.
  • the turret is rotated around its own axis of rotation. The process of receiving the preforms is repeated until all the cups on the turret have been filled, or until the moment predetermined for starting to extract the preforms which have concluded the conditioning cycle.
  • the turret 20 is put into an unloading position, and a first group of N preforms is released by the rotating turret 22, letting it fall, with the aid of mechanical extraction means, possibly combined with a jet of compressed air supplied by the ducts 29, 30, onto another unloading support, for example a conveyor belt or a crate for collecting the cooled preforms.
  • the extraction moulds are of the prior art and are not described in detail.
  • the cooling station can then repeat the operating cycle described above, at steady operating speed unloading at each cycle a group of N cooled preforms, generally corresponding to the number of preforms moulded in a moulding cycle.
  • N cooled preforms generally corresponding to the number of preforms moulded in a moulding cycle.
  • the turret may be made not only as a set of metal plates welded or screwed together to form a caisson, but more generally as a casing defining one or more internal cavities in which there are placed the substantially tubular bodies 22, and suited to contain a cooling fluid; the cooling cups may also present internal cooling ducts; the cooling seats 22 may be located on two faces A, B of the rotating turret, not only aligned according to two directions in one plane pe ⁇ endicular to each other, but also according to two directions simply not parallel, or even in a more irregular way; or not only according to a grid of square mesh, but also with other arrangements, such as grids with rectangular or rhomboid mesh.
  • a further advantage achieved with the device in the invention is the saving of space obtained between the various cups in realising a structure with the cups entirely immersed in the body of the turret and with the cooling circuit made in the structure of the turret itself, and also being able to make cups with seats for holding preforms with a larger diameter.
  • the walls of cups, without associated cooling circuits are thinner than those with cups of the prior art.

Abstract

Une tourelle révolver (20) conçue pour extraire et refroidir des préformes, pour un moule à préforme, se compose d'une structure en forme de caisson, creuse, parallélépipédique, possédant deux faces opposées (A) et (B), présentant plusieurs coupelles de refroidissement (22) intégrées à la structure en caisson de la tourelle, dans lesquelles les préformes sont insérées. Le circuit de refroidissement est obtenu dans la structure elle-même.
PCT/EP2005/050893 2004-03-02 2005-03-01 Dispositif de conditionnement d'objets en plastique et procede de conditionnement respectif WO2005084915A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000108A ITRM20040108A1 (it) 2004-03-02 2004-03-02 Dispositivo e metodo di stampaggio di oggetti in materia plastica.
ITRM2004A000108 2004-03-02

Publications (1)

Publication Number Publication Date
WO2005084915A1 true WO2005084915A1 (fr) 2005-09-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/050893 WO2005084915A1 (fr) 2004-03-02 2005-03-01 Dispositif de conditionnement d'objets en plastique et procede de conditionnement respectif

Country Status (2)

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IT (1) ITRM20040108A1 (fr)
WO (1) WO2005084915A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITRM20120035A1 (it) * 2012-01-31 2013-08-01 Sipa Progettazione Automaz Apparato di trasporto e raffreddamento di preforme

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0592021A1 (fr) * 1992-10-08 1994-04-13 Inter Tooling Services B.V. Dispositif à mouler par injection
US6143225A (en) * 1999-03-03 2000-11-07 Husky Injection Molding Systems Ltd. Turret cooling block for an index machine
US6299431B1 (en) * 1998-07-28 2001-10-09 Husky Injection Molding Systems Ltd. Cooling apparatus for injection molding machines
US20030108638A1 (en) * 1998-03-31 2003-06-12 Witold Neter Post-mold cooling apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0592021A1 (fr) * 1992-10-08 1994-04-13 Inter Tooling Services B.V. Dispositif à mouler par injection
US20030108638A1 (en) * 1998-03-31 2003-06-12 Witold Neter Post-mold cooling apparatus
US6299431B1 (en) * 1998-07-28 2001-10-09 Husky Injection Molding Systems Ltd. Cooling apparatus for injection molding machines
US6143225A (en) * 1999-03-03 2000-11-07 Husky Injection Molding Systems Ltd. Turret cooling block for an index machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITRM20120035A1 (it) * 2012-01-31 2013-08-01 Sipa Progettazione Automaz Apparato di trasporto e raffreddamento di preforme
WO2013114292A3 (fr) * 2012-01-31 2013-10-31 S.I.P.A. Societa' Industrializzazione Progettazione E Automazione S.P.A. Appareil de transport et de refroidissement pour des préformes
CN104125879A (zh) * 2012-01-31 2014-10-29 S.I.P.A.工业设计自动化合伙股份有限公司 用于预成型件的输送和冷却设备
US9073254B2 (en) 2012-01-31 2015-07-07 S.I.P.A. Societa' Industrializzazione Progettazione E. Automazione S.P.A. Conveying and cooling apparatus for preforms
CN104125879B (zh) * 2012-01-31 2016-08-10 S.I.P.A.工业设计自动化合伙股份有限公司 用于预成型件的输送和冷却设备

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