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WO2000029193A1 - Dispositif et procede servant a refroidir et a extraire des corps creux moules par injection - Google Patents

Dispositif et procede servant a refroidir et a extraire des corps creux moules par injection Download PDF

Info

Publication number
WO2000029193A1
WO2000029193A1 PCT/EP1999/007650 EP9907650W WO0029193A1 WO 2000029193 A1 WO2000029193 A1 WO 2000029193A1 EP 9907650 W EP9907650 W EP 9907650W WO 0029193 A1 WO0029193 A1 WO 0029193A1
Authority
WO
WIPO (PCT)
Prior art keywords
parisons
cooling
nozzles
plate
tube
Prior art date
Application number
PCT/EP1999/007650
Other languages
English (en)
Inventor
Giovanni Biraghi
Original Assignee
Bm Biraghi 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 Bm Biraghi S.P.A. filed Critical Bm Biraghi S.P.A.
Priority to AU10354/00A priority Critical patent/AU1035400A/en
Publication of WO2000029193A1 publication Critical patent/WO2000029193A1/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
    • 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
    • B29C45/42—Removing or ejecting moulded articles using means movable from outside the mould between mould parts, e.g. robots
    • B29C45/4225—Take-off members or carriers for the moulded articles, e.g. grippers
    • 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

Definitions

  • the present invention relates to a device and a method for cooling and extracting injection molded hollow bodies.
  • the invention refers in particular to a cooling system for those hollow bodies commonly known as parisons made from thermoplastic material such as PS, PC, PVC, PET etc., and destined for those commercial sectors where it is necessary to replace glass because of its high level of fragility, such as for example, containers for cosmetics and toiletries, for medicines and pharmaceutical products, containers for low pH food products, in particular bottles for water and beverages in general, containers for reusable products, containers that have special necks that are too complex to be produced by other methods.
  • thermoplastic material such as PS, PC, PVC, PET etc.
  • Processing of synthetic resin-based hollow bodies is based on two independent stages: injection molding and blow molding.
  • the parisons are taken from storage and sent to the second stage of blow molding.
  • the parison is heated to a temperature such as to allow it to be stretched and shaped by blowing inside a certain mold, so as to obtain the desired shape.
  • the hollow container in its final shape, is cooled, stored and is then ready to be placed on the market.
  • the parisons are removed from their molds during the injection stage, at a temperature of about 70° C, by means of a carrying device.
  • This carrying device consists of a plate structure bearing hollow seats into which the parisons are sucked by aspiration.
  • the parisons in contact with the air, undergo a first cooling, reaching a temperature of about 60°C.
  • the parisons are removed from the carrying device by means of a take-off plate and positioned in one of a plurality of cooling stations, normally three, in which they reach a temperature of about 30-40°C, which proves sufficiently low to avoid deformation of the parisons while they are conveyed on an underlying conveyor belt, onto which they are unloaded, toward the storage unit.
  • some known injection molding systems use an oversized carrying device capable of housing a number of parisons that is a multiple of the number of molds. In this manner, each molding batch is kept for longer on the carrying device and moved back and forth with it, before being removed by the take-off plate.
  • the object of the invention is to eliminate these drawbacks, providing a device for cooling and extracting hollow injection molded bodies that is compact, economical and simple to make.
  • Another object of the present invention is to provide a cooling and extracting method for hollow injection molded bodies that is able to ensure fast and even cooling thereof.
  • the parisons are removed from the molds by means of a carrying device having cavities wherein the parisons are sucked and cooled by means of a hydraulic cooling system.
  • the carrying device carries the parisons into a position facing a cooling and take-off plate having a plurality of nozzles to receive the parisons. Said nozzles are cooled by making a cooling fluid circulate therein by means of a hydraulic system.
  • the take-off and cooling plate is translated toward the carrying device in such a way that the nozzles enter into the parisons.
  • the take-off plate is then made to stop in said position, so that each parison simultaneously undergoes internal cooling due to heat exchange with the nozzle of the take-off plate and external cooling due to heat exchange with the carrying device.
  • the take-off plate is then withdrawn, retaining on the nozzles the parisons that have been uniformly cooled and can therefore be ejected by means of special ejectors and sent to storage.
  • Figure 1 is a side elevation of the device for cooling and extracting hollow injection molded bodies, according to the invention
  • Figure 2A is a section of a carrying device and a cooling and take-off plate, taken along the line II-II in Figure 1 ;
  • Figures 2B-2D are sections, as in Figure 2A, illustrating various stages of the cooling and extraction process for hollow injection-molded bodies, according to the invention;
  • Figure 3 is an exploded view of a cooling nozzle of the cooling and take-off plate.
  • the carrying device 2 consists of a substantially rectangular plate in which is situated a plurality of bodies 3 having cavities 3a able to receive the parisons 1 obtained from a molding batch.
  • a duct 200 connected to the pneumatic system of the machine is made in each body 3.
  • the parisons are sucked by air aspiration from the molds of the press into the cavities 3 a in which they are accommodated bottom down, whilst the neck of the parisons is disposed on the outside ( Figures 1 and 2A). Retention of the parisons in the cavities 3 a of the carrying device 2 is ensured by the vacuum created therein.
  • the carrying device has two ducts 201 and 202, respectively, for the inlet and outlet of the cooling fluid.
  • the ducts 201 and 202 communicate with a chamber 203, inside the carrying device 2 and surrounding the bodies 3.
  • the cooling fluid coming from the hydraulic system of the machine, through the duct 201, enters the chamber 203 and, through heat exchange, cools the bodies 3 which in turn externally cool the parisons 1 housed inside them.
  • the cooling fluid after having gained heat, leaves the duct 202 to be cooled again and then recirculated.
  • High precision drive means such as brushless motors for example, control the movement of the carrying device 2, to allow precise positioning thereof with respect to a cooling and takeoff plate 4, disposed in a vertical parison receiving position, as shown in Figure 1.
  • the cooling plate 4 has a plurality of nozzles 5 on the surface thereof facing the carrying device.
  • Said nozzles 5 are substantially cylindrical in shape with a slightly smaller outside diameter than the inside diameter of the parisons 1 , so that each nozzle 5 can enter the respective parison 1 carried by the carrying device 2.
  • the single nozzle 5 comprises a first central tubular element 11.
  • Said tube 11 is connected to the pneumatic system of the press to create a vacuum during holding of the parisons 1 and to give out a jet of compressed air during ejection of the parisons 1.
  • a second tubular element 60 having an inside diameter greater than the outside diameter of the first tube 11 is disposed coaxially to the tube 11 , so as to create a hollow space or inner duct 8 between the inner surface thereof and the outer surface of the tube 11.
  • a third tubular element 70 having an inside diameter greater than the outside diameter of the tube 60 is disposed coaxially to the tubes 11 and 60, so as to form a hollow space or outer duct 9 between the inner surface thereof and the outer surface of the tube 60.
  • the tubes 1 1 and 70 are fixed in the point of the nozzle 5 by means of a stopper 46 which closes the tube 70 and has a central hole 48 to allow the inside of the tube 11 to communicate with the outside of the stopper 46.
  • a base 80 is provided at the end opposite to the point of the nozzle in which a circular seat 81 is made such as to house the corresponding end of the tube 70 and more internally a second circular seat 82 housing the corresponding end of the tube 60.
  • a terminal cavity 84 with a smaller diameter allows for passage of the tube 11 , which is fixed to the base 80 by means of a nut 85.
  • an inlet duct 7 that allows entry of the cooling fluid into the inner duct 8 of the nozzle and a duct 10 that allows the fluid to leave from the outer duct 9 of the nozzle 5.
  • the base 80 is destined to engage in a corresponding seat 90 made in the take-off and cooling plate 4.
  • the tube 11 communicates tightly with a duct 45 made in the plate 4 and connected by means of at least one outer tube 50 (see Figure 1) to a pneumatic system;
  • the duct 7 for entry of the cooling fluid is connected to a duct 40 made in the plate 4 and connected by means of at least one outer tube 50 (see Figure 1) to a pneumatic system;
  • the cooling fluid inlet duct 7 is connected to a duct 40 made in the plate 4 and connected by means of an incoming outer tube 12 to the hydraulic cooling system;
  • the fluid outlet duct 10 is connected to a duct 41 made in the plate 4 and connected by means of a return outer tube 12' to the hydraulic cooling system.
  • the cooling fluid from the cooling system of the machine is sent to an outer tube 12 that lets it into the duct 40 inside the plate 4; by means of the inlet ducts 7 the fluid enters the duct 8 of the nozzle, then flows into the outermost duct 9 cooling the tube 70. In this manner the parison
  • An ejector 205 is mounted on the cooling and take-off plate 4.
  • the ejector 205 comprises a plate 215 that is interposed between the base of the cooling and take-off plate 4 and the edge of the neck of the parisons 1 when the nozzles 5 are completely inserted therein.
  • the ejector 205 is mounted on sliding rings 216 that surround the nozzles 5. Thus the ejector 205 is free to translate longitudinally along the axis of the nozzles 5, so as to be able to abut against the edge of the neck of the parisons.
  • FIGs 1 and 2 A show the cooling plate 4 in its vertical position for reception of the parisons 1 from the carrying device 2.
  • drive means such as linear actuators or electric motors, for example, the cooling and take-off plate 4 is translated horizontally toward the carrying device 2.
  • the cooling and take-off plate 4 stops in a position wherein the nozzle 5 has entered partially inside the parison 1. leaving a hollow space 206 between the point of the nozzle 5 and the bottom of the parison 1.
  • the parison 1 is cooled externally and internally at the same time.
  • the outer surface of the parison is in contact with the body 3 cooled by the fluid circulating in the chamber 203 and the inner surface of the parison is in contact with the nozzle 5 which is cooled by the fluid circulating in the ducts 8 and 9 of the nozzle.
  • the pneumatic system of the machine is activated and a blow of compressed air is given off from the duct 200 of the carrying device, pushing the parison 1 toward the nozzle, while at the same time air is sucked in through the duct 11 of the nozzle, creating a vacuum in the hollow space
  • the parison 1 is then sucked onto the nozzle 5, as shown in Figure 2C and the edge of the neck of the parison abuts against the ejector 205.
  • the take-off plate is then rotated about 90°, placing itself in a horizontal ejection position.
  • the ejector 205 is activated and is made to slide axially on the nozzles 5 ejecting the parisons 1, which fall onto a conveyor belt that carries them to storage. Ejection of the parisons may be aided by a jet of compressed air sent into the channels 45 of the cooling and take-off plate.
  • a cooling and take-off plate 4 can be provided, having a number (n x m) of nozzles in which m is a whole number, so as to form m consecutive sections of nozzles.
  • the carrying device 2 positions the parisons in the m consecutive sections of the cooling and take-off plate. Once the cooling and take-off plate has been filled, the parisons relative to the first section, that is the coolest ones that have reached an optimal temperature of 20 °C, are ejected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Robotics (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

Machine de moulage par injection servant à produire des paraisons (1) de matériau thermoplastique et comportant un dispositif de support (2) permettant d'enlever les paraisons des moules et de les apporter à proximité d'une plaque de refroidissement (4) comprenant des ajutages (5); cette plaque de refroidissement peut être mise en service de sorte que lesdits ajutages pénètrent dans les paraisons (1) qui sont refroidies à l'extérieur au moyen d'un échange de chaleur avec le dispositif de support et à l'intérieur au moyen d'un échange de chaleur avec les ajutages (5); les ajutages (5) et le dispositif de support (2) étant refroidis par l'intermédiaire d'un liquide de refroidissement circulant à l'intérieur de ceux-ci et des moyens (205) servant à éjecter les paraisons qui sont recueillies par une bande transporteuse vers une unité de stockage.
PCT/EP1999/007650 1998-11-13 1999-10-12 Dispositif et procede servant a refroidir et a extraire des corps creux moules par injection WO2000029193A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU10354/00A AU1035400A (en) 1998-11-13 1999-10-12 Device and method for cooling and extracting injection-molded hollow bodies

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI98A002470 1998-11-13
IT1998MI002470 IT1303900B1 (it) 1998-11-13 1998-11-13 Dispositivo e metodo di raffreddamento ed estrazione di corpi cavistampati ad iniezione

Publications (1)

Publication Number Publication Date
WO2000029193A1 true WO2000029193A1 (fr) 2000-05-25

Family

ID=11381059

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/007650 WO2000029193A1 (fr) 1998-11-13 1999-10-12 Dispositif et procede servant a refroidir et a extraire des corps creux moules par injection

Country Status (3)

Country Link
AU (1) AU1035400A (fr)
IT (1) IT1303900B1 (fr)
WO (1) WO2000029193A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000059703A1 (fr) * 1999-04-02 2000-10-12 Mold-Masters Limited Systeme de navette conçu pour un procede et un dispositif de moulage par injection
US6391244B1 (en) 2000-04-05 2002-05-21 R & D Tool & Engineering, Co. Air-powered ejection system for preform take out plate assembly
WO2004024418A1 (fr) * 2002-09-13 2004-03-25 Polymold Ag Dispositif d'injection comportant des mandrins temperes montes dans un porte-mandrin pour mouler par soufflage des corps creux en plastique
US6887418B2 (en) 2001-10-24 2005-05-03 Mold-Masters Limited Post mold cooling of preforms
IT201600095904A1 (it) * 2016-09-23 2018-03-23 Sipa Progettazione Automaz Apparato di raffreddamento e manipolazione di preforme in materiale plastico

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0158105A1 (fr) * 1984-03-16 1985-10-16 Sidel Procédé de fabrication de bouteilles en matière plastique à partir d'ébauches creuses obtenues par moulage et dispositifs pour la mise en oeuvre de ce procédé
US5114327A (en) * 1991-01-25 1992-05-19 Williamson James T Rapid cooling apparatus for an injection molding machine
DE4212115A1 (de) * 1992-04-10 1993-06-09 Krupp Maschinentechnik Gmbh, 4300 Essen, De Transporteinrichtung zum halten und kuehlen noch warmer vorformlinge
DE4425795A1 (de) * 1994-07-21 1996-01-25 Krupp Maschinentechnik Transporteinrichtung für noch warme Vorformlinge
US5631030A (en) * 1995-05-05 1997-05-20 Electra Form, Inc. Cooled injection core for an integrated injection blow mold machine
EP0937566A1 (fr) * 1998-02-23 1999-08-25 BM Biraghi S.p.A. Système de refroidissement et d'enlèvement de corps creux moulés par injection
EP0947304A2 (fr) * 1998-03-31 1999-10-06 Husky Injection Molding Systems Ltd. Procédé de refroidissement d'une préforme après moulage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0158105A1 (fr) * 1984-03-16 1985-10-16 Sidel Procédé de fabrication de bouteilles en matière plastique à partir d'ébauches creuses obtenues par moulage et dispositifs pour la mise en oeuvre de ce procédé
US5114327A (en) * 1991-01-25 1992-05-19 Williamson James T Rapid cooling apparatus for an injection molding machine
DE4212115A1 (de) * 1992-04-10 1993-06-09 Krupp Maschinentechnik Gmbh, 4300 Essen, De Transporteinrichtung zum halten und kuehlen noch warmer vorformlinge
DE4425795A1 (de) * 1994-07-21 1996-01-25 Krupp Maschinentechnik Transporteinrichtung für noch warme Vorformlinge
US5631030A (en) * 1995-05-05 1997-05-20 Electra Form, Inc. Cooled injection core for an integrated injection blow mold machine
EP0937566A1 (fr) * 1998-02-23 1999-08-25 BM Biraghi S.p.A. Système de refroidissement et d'enlèvement de corps creux moulés par injection
EP0947304A2 (fr) * 1998-03-31 1999-10-06 Husky Injection Molding Systems Ltd. Procédé de refroidissement d'une préforme après moulage

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000059703A1 (fr) * 1999-04-02 2000-10-12 Mold-Masters Limited Systeme de navette conçu pour un procede et un dispositif de moulage par injection
US6391244B1 (en) 2000-04-05 2002-05-21 R & D Tool & Engineering, Co. Air-powered ejection system for preform take out plate assembly
US6887418B2 (en) 2001-10-24 2005-05-03 Mold-Masters Limited Post mold cooling of preforms
WO2004024418A1 (fr) * 2002-09-13 2004-03-25 Polymold Ag Dispositif d'injection comportant des mandrins temperes montes dans un porte-mandrin pour mouler par soufflage des corps creux en plastique
US7147457B2 (en) 2002-09-13 2006-12-12 Polymold Ag Injection device used for blow molding hollow plastic bodies, comprising extrusion mandrels that can be tempered and are inserted into extrusion mandrel fastener
CN100375671C (zh) * 2002-09-13 2008-03-19 波利莫尔德公司 包括插入喷吹芯棒支架中的温度可控喷吹芯棒的用于吹塑成型中空塑料体的注射装置
KR100953602B1 (ko) * 2002-09-13 2010-04-21 폴리몰드 아게 블로잉 맨드렐 홀더와 그 안에 삽입된 온도제어가 가능한블로잉 맨드렐로 이루어진 할로우 플라스틱 바디의 블로우성형에 사용되는 주입장치
IT201600095904A1 (it) * 2016-09-23 2018-03-23 Sipa Progettazione Automaz Apparato di raffreddamento e manipolazione di preforme in materiale plastico
WO2018055142A1 (fr) * 2016-09-23 2018-03-29 S.I.P.A. Societa' Industrializzazione Progettazione E Automazione S.P.A. Appareil de refroidissement et de manipulation de préformes en matière plastique

Also Published As

Publication number Publication date
IT1303900B1 (it) 2001-03-01
ITMI982470A1 (it) 2000-05-13
AU1035400A (en) 2000-06-05

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