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WO2019111117A1 - Dispositif ou circuit de régulation de température pour moules ou systèmes de moulage - Google Patents

Dispositif ou circuit de régulation de température pour moules ou systèmes de moulage Download PDF

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Publication number
WO2019111117A1
WO2019111117A1 PCT/IB2018/059514 IB2018059514W WO2019111117A1 WO 2019111117 A1 WO2019111117 A1 WO 2019111117A1 IB 2018059514 W IB2018059514 W IB 2018059514W WO 2019111117 A1 WO2019111117 A1 WO 2019111117A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
hot
cold
fluid
tank
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/IB2018/059514
Other languages
English (en)
Inventor
Paolo Bonvicini
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.)
Green Box Srl
Original Assignee
Green Box Srl
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 Green Box Srl filed Critical Green Box Srl
Publication of WO2019111117A1 publication Critical patent/WO2019111117A1/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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C45/7306—Control circuits 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/007—Tempering units for temperature control of moulds or cores, e.g. comprising heat exchangers, controlled valves, temperature-controlled circuits for fluids
    • 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
    • B29C45/73—Heating or cooling of the mould
    • B29C2045/7393—Heating or cooling of the mould alternately heating and cooling
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76518—Energy, power
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76775—Fluids
    • B29C2945/76782—Fluids temperature control fluids
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76929—Controlling method
    • B29C2945/76939—Using stored or historical data sets
    • B29C2945/76949—Using stored or historical data sets using a learning system, i.e. the system accumulates experience from previous occurrences, e.g. adaptive control
    • 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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/7666—Measuring, controlling or regulating of power or energy, e.g. integral function of force

Definitions

  • the present patent is related to mould temperature control systems and in particular concerns a new device or temperature control circuit for moulds or moulding systems with alternating multiple temperatures and a procedure for the startup and operation of the circuit.
  • the prior art comprises temperature control devices for moulding systems intended for plastic items based on the circulation of the thermoregulation fluid inside the mould itself.
  • the temperature control devices of the prior art comprise a heating and cooling system for a fluid, usually water, which regulate the temperature of the fluid entering the mould depending on the moulding phase.
  • a mould temperature control device in the prior art comprises at least one line to load the fluid into a circuit, at least one pump for the circulation of the fluid in the circuit itself, and means to regulate the temperature of the fluid in the circuit.
  • the aforementioned means comprise a fluid heating tank, in which there is an electrical element and a temperature sensor which brings the fluid temperature to a preset value before the fluid is pumped into the mould to be heated.
  • These means also comprise at least one heat exchanger with a cooling fluid, where the temperature of fluid to be pumped into the mould is lowered for the cooling phase where the hardening of the plastic occurs.
  • Patent document EP 1563975 A2 describes a device to control the moulding temperature in a moulding machine comprising a mould equipped with a temperature probe.
  • the device described comprises a cooling tank and a heating tank which are hydraulically connected to each other by a pipe or the like equipped with an opening/closing valve.
  • the cooling tank is not airtight and therefore the device requires two pumps to ensure sufficient pressure for the processes: the first pump to pump cold water into the circuit and the second pump to increase the pressure of the circuit itself.
  • Patent document WO2013/186287 Al describes a device to change the temperature of an object and comprises a circuit with a cold water tank and a hot water tank which communicate with each other via a compensation line with a valve, and where the water coming from these tanks is mixed in various ways and brought into contact with the object to control the temperature.
  • Patent document DE 2217545 Al concerns a heating/cooling apparatus for rotational moulds, also comprising a cold tank and a hot tank hydraulically connected to each other.
  • the object of the present patent is a new device or temperature control circuit for moulds or moulding systems with alternating multiple temperatures.
  • the main object of the present invention is to alternately inject hot and cold fluid into moulds and/or systems to rapidly and cyclically raise/lower their surface temperature and enable specific production sequences.
  • Another important object of the present invention is to have two sub-circuits, one of which is for the circulation of hot fluid, for example and advantageously having a temperature of l80°C, and one for the circulation of cold fluid, for example and advantageously having a temperature of 8°C.
  • hot fluid for example and advantageously having a temperature of l80°C
  • cold fluid for example and advantageously having a temperature of 8°C.
  • Still another important object of the present invention is to speed up the alternation between hot fluid and cold fluid inside the mould, which can also be performed in a few seconds, even in a time interval of 2-3 seconds.
  • a further important object of the present invention is that this alternation between hot fluid and cold fluid may be implemented in different times and sequences on different parts of the mould at the same time.
  • One important advantage achieved by the present invention is that it effectively separates the hot and cold fluids which are partially mixed in the mould, directing them to the respective separate sub-circuits of the device. Another advantage resulting from the effective separation of fluids at different temperatures is that the production cycle can be carried out with very low energy consumption.
  • Another object of the present invention is that it is able to regulate, manually and/or automatically, the opening/closing of the hot and cold fluid delivery/retum valves during the moulding processes, so as to optimize energy consumption while simultaneously achieving the desired performance.
  • the new device or circuit includes, in its main parts:
  • a hot circuit in turn comprising at least one recirculation pump, at least one heating element, from which the process fluid receives heat; at least one hot fluid delivery line to the mould, at least one air vent valve, at least one airtight fluid tank, hereinafter called the hot tank, at least one return line of fluid from the mould to the hot tank, at least one first by-pass line calibrated between the delivery line and the return line;
  • the heating element is for example a tank with one or more electric elements;
  • this hot circuit also advantageously comprises at least one safety valve;
  • a cold circuit in turn comprising at least one recirculation pump, at least one heat exchanger, wherein the process fluid transfers heat to a cooling fluid, at least one cold fluid delivery line to the mould, at least one airtight fluid tank, hereinafter called the cold tank, at least one fluid return line from the mould to the cold tank, at least one first adjustable by-pass line between the delivery line and the cold tank, at least one second adjustable by-pass line between the hot circuit delivery line and return line;
  • the cold circuit also advantageously comprises at least one expansion tank and preferably at least one drain valve hydraulically connected to the cold tank;
  • valve system for the selective injection of the hot and cold fluids into the mould, the valves being mounted on the hot and cold circuit delivery pipes, in correspondence with each of the possible branches of the delivery pipes themselves;
  • valve system for the extraction of fluid from the mould and for the separation of the hot and cold fluids, these valves being mounted on the hot and cold circuit return pipes at each of the possible branches of the return pipes themselves, to selectively convey the fluid leaving the mould to the hot circuit or to the cold circuit according to the temperature of the fluid itself; and where the circuit also comprises at least one device, hereinafter called flow conveying device, in turn comprising at least one connection pipe between the hot and cold tanks and at least one cut-off valve mounted on the connecting pipe.
  • the new circuit is advantageously equipped with at least one electronic control unit, with interface, to manage functions, and store and exchange data with external equipment.
  • the new circuit also comprises at least one exchanger cooling circuit, comprising at least one cooling liquid delivery and return line, usually water.
  • This cooling circuit in turn also comprises at least one regulation valve.
  • valves for the injection and separation of the hot and cold fluids in the mould are preferably remote controlled and are equipped with temperature probes with which it is possible to detect the temperature of the hot and cold fluids entering and leaving the mould.
  • start up and operation procedure comprises the following operations:
  • loading phase the process fluid is loaded into the circuit by means of the loading line, after opening at least one loading valve. It is recommended that the correct pressure of the circuit be verified by means of a possible pressurization pump, able to load additional process fluid in the circuit, if necessary, so as to guarantee the required pressure; in this loading phase, the flow conveying device is configured with the cut-off valve open, so that the hot and cold tanks are hydraulically connected to each other.
  • the flow conveying device valve closes, hydraulically insulating the hot and cold tanks from each other.
  • the valves for the injection and separation of the hot and cold fluids in the mould begin to function in a programmed manner according to the moulding cycles: the hot and cold fluids are then injected separately and alternately in the mould, according to the moulding cycles.
  • the valves separate the fluid in the hot and cold circuits according to the detected temperatures of the outbound fluid.
  • the temperature values of the fluids, as well as the valve opening and closing times, are preset in the control unit and can be modified manually or automatically according to the operating requirements.
  • the hot fluid flow rate and the cold fluid flow rate are balanced due to the differentiated pressures in the respective hot and cold tanks.
  • the storage tanks are airtight and have a fixed volume, therefore the volume of the air contained therein works as a buffer to balance the pressure of the respective fluids and thus the flow rates of the respective pumps.
  • the new circuit ensures relevant energy savings.
  • the hot and cold tanks have a preferably vertical layout, which therefore allow the stratification of the fluid, partially separating the fluid at a higher temperature from that at a lower temperature.
  • the design may enable the flow conveying device to draw the water from the upper zone of the cold tank, so as to transfer the warmest water to the hot tank by compensation, thus further limiting energy consumption to bring/maintain the hot fluid to/at the desired temperature.
  • the aforementioned flow conveying device also selectively enables the communication between the two circuits, that is, the cold and hot circuits, or to separate them completely.
  • the cooling circuit heat exchanger enables the substantially immediate availability of cold fluid.
  • the availability of hot fluid is also substantially immediate since the hot circuit recirculating pump is installed in series with respect to the hot tank.
  • temperature probes are also installed to monitor the temperature of the fluid exiting the moulds in order to enable the management of the separation valves and direct the fluid into the hot circuit or the cold circuit.
  • injection valves and separation valves can all operate synchronously or asynchronously.
  • the control unit makes it possible to set operating parameters to optimize the separation of fluids and energy consumption.
  • the operation and the injection and separation valve opening/closing time, as well as the regulation of the operating parameters are a function of the process temperature to be obtained in the mould at least in the initial start up of the work phase. Subsequently, these parameters and the valve opening/closing times are adjusted manually or automatically so as to optimize energy consumption.
  • control unit of the new device or circuit works according to a management program that manages these parameters after an initial "self-learning" phase, in which those parameters can be manually entered by an operator. After this initial learning phase, the management program regulates the parameters in a substantially continuous manner so as to obtain the greatest possible energy savings while maintaining the desired performance.
  • the hot/cold heat exchange times are determined on the return lines, that is, the opening/closing times of the separation valves located at the mould outlet;
  • the management program starts and automatically regulates the parameters, including the valve opening/closing times, so as to optimize the energy consumption.
  • the first "self-learning" phase may take place automatically by the control unit in question which, by means of the management program and once the process requirements are established, automatically regulates the operating parameters (valve opening/closing times, flow rates, hot/cold fluid pressure and temperature) thus enabling even this first phase of use as described above to be automated.
  • control unit calculates the relevant operating parameters, controls them and, if necessary, regulates them continuously, with the aim of minimizing the energy consumption of the entire system.
  • This regulation is continuously updated, adapting to any change in operating conditions determined by the process in which the system is used, so as to always obtain the lowest energy consumption.
  • Figure 1 shows a diagram of the new circuit (100) where for simplicity a single mould (S) is shown with two delivery lines (23, 33) and two return lines (25, 35) for the hot and cold fluids.
  • the new temperature control device (10) for moulds or moulding systems (S) comprises at least one process fluid loading line (11) for the circuit, where that process fluid is normally water.
  • the loading line (11) comprises the necessary input fluid control devices, such as a valve (112), a pump (111), a non-return valve (113), a pressure sensor (114), etc.
  • the circuit (10) comprises one first sub-circuit, hereinafter called hot circuit (20), shown in Figure 1 with a thick line, and one second sub-circuit, hereinafter called cold circuit (30), shown in Figure 1 with a fine line.
  • the hot circuit (20) comprises a recirculation pump (21), at least one heating element (22), in which the fluid is heated, at least one vent valve (223), at least one temperature probe (28) suitably installed downstream of the heating element (22), at least one delivery line (23) for the hot fluid towards the mould (S), at least one fluid storage tank, hereinafter called hot tank (24), at least one return line (25) of the fluid from the mould (S) to the hot tank (24).
  • the heating element (22) is suitably a tank (221) containing at least one electric element (222) in which the fluid to be heated circulates.
  • the hot circuit (20) also comprises at least one first adjustable by-pass line (26) between the delivery line (23) and the return line (25).
  • the hot circuit (20) also advantageously comprises one or more safety valves (27).
  • the cold circuit (30) comprises at least one recirculation pump (31), at least one heat exchanger (32), wherein the process fluid transfers heat to a cooling fluid, at least one temperature probe (38), suitably installed downstream of the at least one heat exchanger (32), at least one cold fluid delivery line (33) towards the mould (S), at least one fluid storage tank, hereinafter called cold tank (34), and at least one return line (35) of the fluid from the mould (S) to the cold tank (34).
  • the circuit (10) also comprises at least one heat exchanger (32) cooling circuit (50), comprising at least one delivery line (51) and at least one outlet line (52) of the cooling fluid which is normally water.
  • the cooling circuit (50) in turn also comprises at least one regulation valve (53).
  • the cold circuit (30) also comprises at least one first adjustable by-pass line (36) between the delivery line (33) and the cold tank (34), at least one second adjustable by-pass line (37) between the delivery line (33) and the return line (25) of the hot circuit (20).
  • the cold circuit (30) also advantageously comprises at least one expansion tank (341) hydraulically connected to the cold tank (34) and preferably at least one drain valve (342) and a drain/vent/overpressure valve (343) hydraulically connected to the cold tank (34).
  • Each of the delivery lines (23, 33) of the hot circuit (20) and cold circuit (30) preferably comprise delivery branches (231, 331) for the distribution of the fluid on the mould (S).
  • At least one injection valve (232, 332) is installed on each of the delivery branches (231, 331) for the selective injection of hot and cold fluids into the mould (S).
  • Each of the return lines (25, 35) of the hot circuit (20) and cold circuit (30) preferably comprise the return branches (251, 351) conveying the fluid from the mould (S).
  • At least one separation valve (252, 352) is installed on each of the return branches (251, 351) to selectively convey the fluid exiting the mould to the hot circuit (20) or to the cold circuit (30) depending on the measured temperature of the fluid itself.
  • the hot and cold fluid injection (232, 332) and separation (252, 352) valves in the mould (S) are preferably remotely controlled and equipped with temperature probes with which it is possible to detect the temperature values of the hot and cold fluids entering and exiting the mould (S).
  • temperature probes (12) are also installed upstream of the separation valves (252, 352) and, according to the temperature of the fluid exiting the mould (S), the valves (252, 352) convey the fluid towards the hot circuit (20) or towards the cold circuit (30).
  • the circuit (10) also comprises at least one flow conveying device (40) in turn comprising at least one connection pipe (41) between the hot tank (24) and the cold tank (34) and at least one cut-off valve (42) installed on the connection pipe (41).
  • the valve (42) of the pipe (41) selectively connects the cold tank (34) and the hot tank (24) depending on the operating phase of the circuit (10) and depending on the temperature and pressure of the fluids in the cold circuit (30) and hot circuit (20).
  • These injection valves and separation valves can all operate synchronously or asynchronously.
  • the control unit makes it possible to set operating parameters to optimize the separation of fluids and energy consumption.
  • the system also advantageously comprises pressure sensors, specially installed in the delivery lines (23, 33) of the hot (20) and cold (30) circuits.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un circuit de régulation de température (10) pour des moules (S) ou des systèmes de moulage, comprenant une conduite de charge (11) appropriée pour charger un fluide de traitement, un circuit chaud (20) pourvu d'un élément chauffant (22) et d'un réservoir d'accumulation ou d'un réservoir chaud (24), un circuit froid (30) pourvu d'un échangeur de chaleur (32) et d'un réservoir d'accumulation ou d'un réservoir froid (34). Le circuit (10) comprend également un tuyau de raccordement (41) avec une vanne (42), monté entre ledit réservoir chaud (24) et ledit réservoir froid (34), afin de placer sélectivement ledit réservoir chaud (24) et ledit réservoir froid (34) en communication hydraulique l'un avec l'autre.
PCT/IB2018/059514 2017-12-07 2018-11-30 Dispositif ou circuit de régulation de température pour moules ou systèmes de moulage Ceased WO2019111117A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT201700141561 2017-12-07
IT102017000141561 2017-12-07

Publications (1)

Publication Number Publication Date
WO2019111117A1 true WO2019111117A1 (fr) 2019-06-13

Family

ID=61868620

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2018/059514 Ceased WO2019111117A1 (fr) 2017-12-07 2018-11-30 Dispositif ou circuit de régulation de température pour moules ou systèmes de moulage

Country Status (1)

Country Link
WO (1) WO2019111117A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2217545A1 (de) * 1972-04-12 1973-10-31 Amtrust Ag Heiz- und kuehleinrichtung fuer doppelwandige rotationshohlformen
JPH03244512A (ja) * 1990-02-22 1991-10-31 Ube Ind Ltd 金型加熱冷却装置
EP1563975A2 (fr) * 2004-02-12 2005-08-17 Mitsubishi Heavy Industries, Ltd. Dispositif et procédé de réglage de la température pour un moule, et unité de commande de la température d'un moule
WO2013186287A1 (fr) * 2012-06-15 2013-12-19 Messer Group Gmbh Dispositif et procédé destinés à modifier la thermorégulation d'objets
US20170274571A1 (en) * 2016-03-23 2017-09-28 iMFLUX Inc. Injection molding controller interface with user-adjustable variables
WO2019025122A1 (fr) * 2017-08-03 2019-02-07 Kraussmaffei Technologies Gmbh Procédé et dispositif de thermorégulation variothermique d'outils de moulage par injection

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2217545A1 (de) * 1972-04-12 1973-10-31 Amtrust Ag Heiz- und kuehleinrichtung fuer doppelwandige rotationshohlformen
JPH03244512A (ja) * 1990-02-22 1991-10-31 Ube Ind Ltd 金型加熱冷却装置
EP1563975A2 (fr) * 2004-02-12 2005-08-17 Mitsubishi Heavy Industries, Ltd. Dispositif et procédé de réglage de la température pour un moule, et unité de commande de la température d'un moule
WO2013186287A1 (fr) * 2012-06-15 2013-12-19 Messer Group Gmbh Dispositif et procédé destinés à modifier la thermorégulation d'objets
US20170274571A1 (en) * 2016-03-23 2017-09-28 iMFLUX Inc. Injection molding controller interface with user-adjustable variables
WO2019025122A1 (fr) * 2017-08-03 2019-02-07 Kraussmaffei Technologies Gmbh Procédé et dispositif de thermorégulation variothermique d'outils de moulage par injection

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