ITMC20010037A1 - INJECTION MOLDING PROCESS ASSISTED BY GAS MIXED WITH A REFRIGERANT SUBSTANCE. - Google Patents
INJECTION MOLDING PROCESS ASSISTED BY GAS MIXED WITH A REFRIGERANT SUBSTANCE. Download PDFInfo
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- ITMC20010037A1 ITMC20010037A1 IT2001MC000037A ITMC20010037A ITMC20010037A1 IT MC20010037 A1 ITMC20010037 A1 IT MC20010037A1 IT 2001MC000037 A IT2001MC000037 A IT 2001MC000037A IT MC20010037 A ITMC20010037 A IT MC20010037A IT MC20010037 A1 ITMC20010037 A1 IT MC20010037A1
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- Prior art keywords
- gas
- mold
- mixture
- nozzle
- process according
- Prior art date
Links
- 239000003507 refrigerant Substances 0.000 title claims description 10
- 239000000126 substance Substances 0.000 title claims description 8
- 238000001746 injection moulding Methods 0.000 title claims description 4
- 239000007789 gas Substances 0.000 claims description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 16
- 239000012778 molding material Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000000859 sublimation Methods 0.000 claims description 2
- 230000008022 sublimation Effects 0.000 claims description 2
- 238000002663 nebulization Methods 0.000 claims 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims 1
- 238000000465 moulding Methods 0.000 description 10
- 239000012530 fluid Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009692 water atomization Methods 0.000 description 1
Classifications
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- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1734—Nozzles 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
- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
-
- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
- B29C2045/1707—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances using a liquid, e.g. water
-
- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
- B29C2045/1709—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances using a cooling fluid
-
- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
- B29C2045/171—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances using an evaporating substance
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
DESCRIZIONE DESCRIPTION
a corredo di una domanda di brevetto per invenzione industriale avente per titolo: accompanying a patent application for an industrial invention entitled:
“PROCESSO DI STAMPAGGIO AD INIEZIONE ASSISTITO DA GAS MISCELATO CON UNA SOSTANZA REFRIGERANTE”. “INJECTION MOLDING PROCESS ASSISTED BY GAS MIXED WITH A REFRIGERANT SUBSTANCE”.
TESTO DELLA DESCRIZIONE TEXT OF THE DESCRIPTION
La presente domanda di brevetto per invenzione industriale ha per oggetto un processo di stampaggio ad iniezione assistito da gas miscelato con una sostanza refrigerante, preferibilmente acqua nebulizzata. The present patent application for industrial invention relates to a gas-assisted injection molding process mixed with a coolant, preferably nebulized water.
Resta inteso che la tutela brevettuale si estende anche all’impianto per l’attuazione del processo secondo il trovato. It is understood that patent protection also extends to the plant for the implementation of the process according to the invention.
La tecnologia di stampaggio assistita da gas si è sviluppata negli ultimi decenni ed è stata subito individuata come la più indicata per la formatura di manufatti di grosso spessore, con riferimento ai quali detta tecnologia consente di ridurre il consumo di materiale di stampaggio e di abbreviare i cicli di lavorazione. The gas-assisted molding technology has developed in recent decades and was immediately identified as the most suitable for forming thick products, with reference to which this technology allows to reduce the consumption of molding material and to shorten the processing cycles.
Detta tecnica di stampaggio prevede di immettere gas allinteno dello stampo, dopo avervi iniettato una quantità di materiale di stampaggio sufficiente per riempirne la relativa impronta solo parzialmente, così che lo stesso gas possa sospingere in avanti la massa fluida di materiale fino a completare il riempimento di detta impronta; in questa fase il gas scava in seno alla massa fluida un canale centrale, stendendo contemporaneamente detta massa contro le pareti interne dell’impronta. Said molding technique involves introducing gas into the mold, after having injected a quantity of molding material sufficient to fill its impression only partially, so that the same gas can push forward the fluid mass of material until the filling of the material is completed. said imprint; in this phase the gas digs a central channel within the fluid mass, simultaneously spreading said mass against the internal walls of the impression.
Una volta terminata la fase di raffreddamento, il gas viene scaricato e lo stampo viene aperto, per procedere con la sformatura del pezzo, allinteno del quale resta una caratteristica intercapedine vuota, corrispondente all’ anzidetto canale scavato dal gas. Once the cooling phase is complete, the gas is discharged and the mold is opened, to proceed with the demoulding of the piece, inside which a characteristic empty cavity remains, corresponding to the aforementioned channel dug by the gas.
La tecnologia di stampaggio assistito da gas offre il vantaggio di una riduzione del peso del pezzo stampato nonché una riduzione dei suoi tempi di raffreddamento in seno allo stampo, con conseguente abbattimento della durata di ciascun ciclo di stampaggio. The gas-assisted molding technology offers the advantage of a reduction in the weight of the molded piece as well as a reduction in its cooling time inside the mold, with a consequent reduction in the duration of each molding cycle.
Va detto, però, che non è sempre facile attuare questa tecnologia di stampaggio che presenta tutt’ora molti problemi sia sotto l’aspetto della progettazione dei manufatti, sia sotto l’aspetto della messa a punto del processo. It must be said, however, that it is not always easy to implement this molding technology which still presents many problems both in terms of the design of the products, and in terms of the development of the process.
Un problema quanto mai delicato da risolvere è quello legato ai lunghi tempi di raffreddamento delle pareti interne del manufatto, quelle che circoscrivono detta intercapedine scavata dal gas, dove la temperatura si mantiene su valori molto elevati, a differenza di quanto accade sulle pareti esterne del manufatto, le quali possono smaltire il calore cedendolo alle pareti interne della matrice, raffreddate per mezzo di un opportuno impianto di refrigerazione di cui risulta dotato lo stampo. A very delicate problem to solve is that linked to the long cooling times of the internal walls of the product, those that circumscribe said cavity dug by the gas, where the temperature is kept on very high values, unlike what happens on the external walls of the product. , which can dissipate the heat by transferring it to the internal walls of the matrix, cooled by means of a suitable refrigeration system with which the mold is equipped.
L’elevata temperatura all’ interno del pezzo non solo allunga i tempi del ciclo di stampaggio, ma può determinare anche deformazioni imprevedibili ed intollerabili del pezzo a causa dell’ insorgere di stati tensionali, imputabili ai differenti tempi di ritiro fra le zone più interne e quelle più esterne del pezzo. The high temperature inside the piece not only lengthens the times of the molding cycle, but can also cause unpredictable and intolerable deformations of the piece due to the onset of stress states, attributable to the different withdrawal times between the innermost and the outermost ones of the piece.
Scopo della presente invenzione è quello di risolvere entrambi gli inconvenienti sopra denunciati, realizzando un processo ad iniezione assistito da gas, in cui è possibile mantenere al di sotto di valori prefissati la temperatura dell’intercapedine piena di gas, così da annullare in pratica il gradiente termico fra le pareti interne e quelle esterne del pezzo, fin tanto che quest’ultimo staziona nello stampo. The purpose of the present invention is to solve both the aforementioned drawbacks, realizing a gas-assisted injection process, in which it is possible to keep the temperature of the gas-filled cavity below predetermined values, so as to practically cancel the gradient. between the internal and external walls of the piece, as long as the latter remains in the mold.
Questo risultato viene raggiunto dal processo di stampaggio secondo il trovato, il quale si caratterizza per il fatto di iniettare all’ interno dello stampo gas contenente acqua nebulizzata, che, per effetto dell’ elevate pressioni di iniezione del gas, non riesce ad assumere lo stato di vapore, nonostante l’elevata temperatura presente all’interno dello stampo in fase di iniezione. This result is achieved by the molding process according to the invention, which is characterized by injecting inside the mold gas containing atomized water, which, due to the effect of the high gas injection pressures, is unable to assume the state of steam, despite the high temperature inside the mold during the injection phase.
Una volta completata la fase di svuotamento della massa fluida di materiale di stampaggio ad opera di detta miscela di gas ed acqua nebulizzata, il processo secondo il trovato prevede di mettere in comunicazione con un ambiente a pressione atmosferica la camera in cui staziona detta miscela, con conseguente e istantanea evaporazione di tutta la massa di acqua nebulizzata in essa contenuta. Once the step of emptying the fluid mass of molding material by said mixture of gas and nebulized water has been completed, the process according to the invention provides for the chamber in which said mixture is stationed to communicate with an atmospheric pressure environment, with consequent and instantaneous evaporation of the whole mass of atomized water contained in it.
Naturalmente il passaggio di stato da liquido a vapore avviene con l’assorbimento da parte dell’acqua nebulizzata del cosiddetto calore latente di vaporizzazione a pressione atmosferica, con conseguente raffreddamento delle pareti interne del pezzo, ancora contenuto nello stampo, che viene aperto soltanto dopo che è stata completata la fase di estrazione del gas e del vapore d’acqua contenuti in quella stessa camera che il gas aveva scavato in seno alla massa fluida del materiale di stampaggio. Naturally, the transition from liquid to vapor occurs with the absorption by the nebulized water of the so-called latent heat of vaporization at atmospheric pressure, with consequent cooling of the internal walls of the piece, still contained in the mold, which is opened only after the phase of extraction of the gas and of the water vapor contained in that same chamber that the gas had excavated within the fluid mass of the molding material was completed.
Per maggior chiarezza esplicativa la descrizione del processo secondo il trovato prosegue con riferimento alle tavole di disegno allegate, riportate solo a titolo esemplificativo e non limitativo, in cui: For greater clarity, the description of the process according to the invention continues with reference to the attached drawing tables, reported only by way of non-limiting example, in which:
- la fig.l mostra schematicamente rimpianto per l’attuazione del processo secondo il trovato; - fig. 1 schematically shows regret for the implementation of the process according to the invention;
- le figure da 2 a 6 mostrano schematicamente le condizioni che si generano all’ interno dello stampo durante le varie fasi operative del processo di stampaggio secondo il trovato. - Figures 2 to 6 schematically show the conditions that are generated inside the mold during the various operating phases of the molding process according to the invention.
- la fig. 7 è una sezione schematica dell’ugello utilizzato per immettere nello stampo il gas e la miscela di gas e di acqua nebulizzata. - fig. 7 is a schematic section of the nozzle used to introduce the gas and the mixture of gas and atomized water into the mold.
Con riferimento alla fig. 1, rimpianto per l’attuazione del processo di stampaggio secondo il trovato comprende: With reference to fig. 1, regret for the implementation of the molding process according to the invention includes:
- una unità (1) di compressione del gas (solitamente azoto) prelevato da una bombola (la); - a unit (1) for compressing the gas (usually nitrogen) taken from a cylinder (la);
- un’unita (2) di nebulizzazione dell’acqua, dove viene immessa acqua ed il gas in pressione proveniente dall’unità (1) e dalla quale fuoriesce una miscela in pressione di gas ed acqua nebulizzata; - a water atomization unit (2), where water and the pressurized gas coming from the unit (1) are introduced and from which a pressurized mixture of gas and atomized water comes out;
- uno speciale ugello (3), a tre vie, che consente di iniettare la miscela di gas e acqua nebulizzata all’ interno dello stampo (4) e di scaricare la miscela di gas e vapor d’acqua dallo stampo in un ambiente a pressione atmosferica; - a special nozzle (3), three-way, which allows to inject the mixture of gas and atomized water into the mold (4) and to discharge the mixture of gas and water vapor from the mold in a pressurized environment atmospheric;
- un comune ugello (5) che consente di iniettare il materiale di stampaggio all’ interno dello stampo (4). - a common nozzle (5) that allows you to inject the molding material inside the mold (4).
Con particolare riferimento alla fig.7, detto ugello (3) reca una bocca di ingresso (3 a) in cui perviene la miscela di gas e acqua nebulizzata, una prima bocca di scarico (3b) attraverso cui detta miscela può essere iniettata dentro lo stampo (4) ed una seconda bocca di scarico (3c) attraverso cui la miscela di gas e vapor d’acqua può essere scaricata dallo stampo (4) in un ambiente a pressione atmosferica. With particular reference to fig. 7, said nozzle (3) has an inlet (3 a) into which the mixture of gas and nebulized water reaches, a first outlet (3b) through which said mixture can be injected into the mold (4) and a second discharge mouth (3c) through which the mixture of gas and water vapor can be discharged from the mold (4) in an atmospheric pressure environment.
Un apposito otturatore (3d), scorrevole in seno all’ugello (3), determina, a seconda della posizione assunta, l’apertura o la chiusura selezionate delle anzidette tre vie di attraversamento dell’ugello (3). A special shutter (3d), sliding inside the nozzle (3), determines, depending on the position taken, the selected opening or closing of the aforementioned three nozzle crossing ways (3).
La sequenza delle fasi del ciclo operativo previsto dal processo di stampaggio in parola è la seguente: The sequence of the phases of the operating cycle foreseen by the molding process in question is as follows:
- iniezione del materiale di stampaggio nello stampo (4) attraverso l’ugello (5) fino a parziale riempimento dell’impronta interna (4a) dello stampo (4), come mostrato in fig. 2, dove è illustrato anche l’ugello (3), le cui bocche (3a) e (3c) sono entrambe chiuse; - injection of the molding material into the mold (4) through the nozzle (5) until the internal impression (4a) of the mold (4) is partially filled, as shown in fig. 2, where the nozzle (3) is also shown, whose mouths (3a) and (3c) are both closed;
- iniezione della miscela di gas e acqua nebulizzata nello stampo (4) attraverso l’ugello (3) fino a completo riempimento della matrice (4a) dello stampo da parte del materiale di stampaggio, che viene distribuito sulle pareti interne di detta impronta, mentre all’ interno del materiale di stampaggio si forma un’intercapedine (6) scavata da detta miscela in pressione, come mostrato nelle figg. 3 e 4, dove è possibile notare che, in questa fase, le bocche (3 a e 3b) sono aperte mentre la bocca (3c) è chiusa; - injection of the mixture of gas and nebulized water into the mold (4) through the nozzle (3) until the mold matrix (4a) is completely filled by the molding material, which is distributed on the internal walls of said impression, while inside the molding material a cavity (6) is formed, hollowed out by said mixture under pressure, as shown in figs. 3 and 4, where it is possible to notice that, in this phase, the mouths (3a and 3b) are open while the mouth (3c) is closed;
- apertura della seconda bocca di scarico (3c) dell’ugello (3) così da mettere in contatto detta intercapedine (6) con un ambiente a pressione atmosferica, provocando l’evaporazione istantanea della acqua nebulizzata, come mostrato in fig. 5, dove è possibile notare che, in questa fase, le bocche (3b e 3c) sono aperte mentre la bocca (3 a) è chiusa; - opening of the second discharge mouth (3c) of the nozzle (3) so as to put said cavity (6) in contact with an environment at atmospheric pressure, causing the instant evaporation of the atomized water, as shown in fig. 5, where it is possible to note that, in this phase, the mouths (3b and 3c) are open while the mouth (3 a) is closed;
- scarico all’atmosfera, sempre tramite l’ugello (3), del gas e del vapor d’acqua presenti all’interno di detta intercapedine (6), come mostrato in fig. 6, dove è possibile notare che, in questa fase, le bocche (3b e 3c) vengono mantenute aperte mentre viene mantenuta chiusa la bocca (3 a). - discharge to the atmosphere, again through the nozzle (3), of the gas and water vapor present within said cavity (6), as shown in fig. 6, where it is possible to note that, in this phase, the mouths (3b and 3c) are kept open while the mouth (3 a) is kept closed.
E’ evidente che a quest’ultima fase segue quella di apertura dello stampo e sformatura del pezzo. It is evident that this last phase is followed by the opening of the mold and the demoulding of the piece.
Anche se nel testo della descrizione che precede si è fatto sempre riferimento all’acqua, resta inteso che il principio inventivo resta inalterato, così come i vantaggi che ne derivano, se al posto dell’acqua nebulizzata viene utilizzato, come sostanza refrigerante, un altro fluido nebulizzato che, fatto scendere improvvisamente a pressione atmosferica e trovandosi a temperature comprese fra i 100°C ed i 300 °C dia luogo al fenomeno del passaggio di stato da liquido a gassoso. Even if in the text of the above description reference has always been made to water, it is understood that the inventive principle remains unchanged, as well as the advantages deriving from it, if another nebulized fluid which, suddenly dropped to atmospheric pressure and finding itself at temperatures between 100 ° C and 300 ° C, gives rise to the phenomenon of the transition of state from liquid to gaseous.
Nulla vieta, poi, di utilizzare , quale sostanza refrigerante, polvere di un gas allo stato solido, destinata a dar luogo ad un fenomeno di sublimazione piuttosto che di evaporazione. Furthermore, nothing prevents the use of a solid state gas powder as a refrigerant, destined to give rise to a phenomenon of sublimation rather than evaporation.
In questa prospettiva, al posto dell’acqua nebulizzata potrebbero essere utilizzati, ad esempio, alcol nebulizzato o butiline nebulizzato, se non addirittura polvere di ghiaccio secco (anidride carbonica alla stato solido) atta a sublimare non appena la camera (6) scende a pressione atmosferica. In this perspective, instead of nebulized water, for example, nebulized alcohol or nebulized butyline could be used, or even dry ice powder (carbon dioxide in the solid state) able to sublimate as soon as the chamber (6) drops to pressure atmospheric.
Claims (6)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2001MC000037A ITMC20010037A1 (en) | 2001-03-29 | 2001-03-29 | INJECTION MOLDING PROCESS ASSISTED BY GAS MIXED WITH A REFRIGERANT SUBSTANCE. |
| PCT/IT2002/000173 WO2002078928A1 (en) | 2001-03-29 | 2002-03-19 | Gas & refrigerant assisted injection molding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2001MC000037A ITMC20010037A1 (en) | 2001-03-29 | 2001-03-29 | INJECTION MOLDING PROCESS ASSISTED BY GAS MIXED WITH A REFRIGERANT SUBSTANCE. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ITMC20010037A1 true ITMC20010037A1 (en) | 2002-09-29 |
Family
ID=11443403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT2001MC000037A ITMC20010037A1 (en) | 2001-03-29 | 2001-03-29 | INJECTION MOLDING PROCESS ASSISTED BY GAS MIXED WITH A REFRIGERANT SUBSTANCE. |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | ITMC20010037A1 (en) |
| WO (1) | WO2002078928A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2391831B (en) * | 2002-08-15 | 2007-02-14 | Adrian Joseph Lloyd | Improvements relating to vehicle external rearview mirrors |
| DE102005049919A1 (en) * | 2005-10-17 | 2007-04-19 | Battenfeld Gmbh | Process for the production of molded plastic parts |
| EP2607051B1 (en) * | 2011-12-21 | 2018-07-04 | Kyoraku CO., LTD | Use of a blow moulded foam duct |
| US9266259B2 (en) | 2011-12-23 | 2016-02-23 | Kyoraku Co. Ltd. | Method of forming hollow blow-molded foam and such hollow blow-molded foam |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07124987A (en) * | 1993-11-08 | 1995-05-16 | Asahi Chem Ind Co Ltd | Method for blow injection molding |
| JP3376751B2 (en) * | 1995-03-30 | 2003-02-10 | 豊田合成株式会社 | Method and apparatus for manufacturing resin hollow body |
-
2001
- 2001-03-29 IT IT2001MC000037A patent/ITMC20010037A1/en unknown
-
2002
- 2002-03-19 WO PCT/IT2002/000173 patent/WO2002078928A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002078928A1 (en) | 2002-10-10 |
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