IT202100019223A1 - EXTRUSION AND BLOW MOLDING EQUIPMENT - Google Patents
EXTRUSION AND BLOW MOLDING EQUIPMENT Download PDFInfo
- Publication number
- IT202100019223A1 IT202100019223A1 IT102021000019223A IT202100019223A IT202100019223A1 IT 202100019223 A1 IT202100019223 A1 IT 202100019223A1 IT 102021000019223 A IT102021000019223 A IT 102021000019223A IT 202100019223 A IT202100019223 A IT 202100019223A IT 202100019223 A1 IT202100019223 A1 IT 202100019223A1
- Authority
- IT
- Italy
- Prior art keywords
- parison
- extrusion
- cavity
- blow molding
- mold
- Prior art date
Links
- 238000001125 extrusion Methods 0.000 title claims description 10
- 238000000071 blow moulding Methods 0.000 title claims description 9
- 238000007664 blowing Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000003570 air Substances 0.000 description 13
- 229920000642 polymer Polymers 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000012815 thermoplastic material Substances 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- 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
- B29C49/4242—Means for deforming the parison prior to the blowing operation
-
- 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
- B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
- B29C2049/4673—Environments
- B29C2049/4676—Environments being dry air to surround or flush parts of the blow moulding apparatus, e.g. blow mould, preforms or parisons
-
- 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
- B29C49/58—Blowing means
- B29C49/60—Blow-needles
- B29C2049/6072—Blow-needles being movable, e.g. blow needles move to pierce the parison
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- B29C49/04—Extrusion blow-moulding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
DESCRIZIONE dell'invenzione industriale dal titolo: DESCRIPTION of the industrial invention entitled:
"APPARECCHIATURA DI ESTRUSIONE E SOFFIAGGIO" "EXTRUSION AND BLOW MOLDING EQUIPMENT"
TESTO DELLA DESCRIZIONE DESCRIPTION TEXT
La presente invenzione si riferisce ad un'apparecchiatura di estrusione e soffiaggio, particolarmente per la produzione di elementi tubolari in materiale termoplastico. The present invention relates to an extrusion and blow molding apparatus, particularly for the production of tubular elements in thermoplastic material.
Uno dei principali problemi nello stampaggio a soffiaggio tridimensionale assistito dal vuoto (3D blow molding suction process) ? l'incremento di viscosit? del tubo di massa fusa quando il flusso di aria generata dalla pompa del vuoto lambisce il tubo stesso e sottrae calore, impedendo cos? l'attraversamento di curve strette a causa dell'irrigidimento del polimero. One of the main problems in the vacuum assisted three-dimensional blow molding (3D blow molding suction process)? the increase in viscosity? of the tube of molten mass when the flow of air generated by the vacuum pump touches the tube itself and removes heat, thus preventing? the crossing of sharp curves due to the stiffening of the polymer.
La presenza di curve strette e/o variazioni di sezione della cavit? di stampo, polimeri con finestre di processo termico particolarmente strette e la lunghezza del manufatto, sono le condizioni che spesso determinano la stampabilit?, o la ripetibilit?, di alcuni prodotti, in particolare i condotti in tecnopolimeri utilizzati nell'industria automobilistica. The presence of tight curves and/or variations in the section of the cavity? of the mould, polymers with particularly narrow thermal process windows and the length of the product, are the conditions that often determine the printability, or repeatability, of some products, in particular the technopolymer ducts used in the automotive industry.
US2005133969A1 descrive la produzione di corpi tubolari estrusi tridimensionali, a partire da un tubo di materiale flessibile termoplastico, mediante un sistema di soffiaggio aspirato nel quale la portata dell'aria aspirata ? prodotta in quantit? corrispondente a quella richiesta per determinare lo scorrimento del tubo flessibile di partenza all'interno della cavit? dello stampo. US2005133969A1 describes the production of three-dimensional extruded tubular bodies, starting from a tube of flexible thermoplastic material, by means of an aspirated blowing system in which the flow rate of the aspirated air is ? produced in quantity? corresponding to that required to determine the sliding of the flexible starting hose inside the cavity? of the mould.
Le tecniche di stampaggio attuali non permettono di stampare parti lunghe. Current molding techniques do not allow for long parts to be molded.
Le parti di una certa lunghezza sono infatti attualmente realizzate tramite saldatura, oppure formate da pi? parti collegate. The parts of a certain length are in fact currently made by welding, or formed by more? connected parts.
Compito della presente invenzione ? quello di realizzare un sistema che superi gli inconvenienti della tecnica nota citata. Task of the present invention ? that of realizing a system which overcomes the drawbacks of the cited prior art.
Nell'ambito di questo compito, uno scopo dell?invenzione ? quello di realizzare un dispositivo che permetta di realizzare parti tubolari in termopolimero pi? lunghe rispetto alle parti tubolari attualmente realizzabili secondo la tecnica nota. Within the scope of this task, a purpose of the invention is to create a device that allows you to create tubular parts in thermopolymer more? longer than the tubular parts which can currently be manufactured according to the prior art.
Un altro scopo della presente invenzione ? quello di realizzare una struttura che, per le sue peculiari caratteristiche realizzative, sia in grado di assicurare le pi? ampie garanzie di affidabilit? e di sicurezza nell'uso. Another object of the present invention ? that of creating a structure which, due to its particular construction characteristics, is able to ensure the most? extensive guarantees of reliability? and safety in use.
Questi scopi ed altri che meglio appariranno in seguito, sono raggiunti da un'apparecchiatura di estrusione e soffiaggio, comprendente una testa di estrusione atta a generare un parison in corrispondenza di uno stampo; detto stampo avendo una cavit? di stampo nella quale viene formato un pezzo per insufflazione con aria compressa tramite un ago che perfora detto parison, una volta che detto parison ? stato introdotto e guidato in detta cavit? da detto flusso di aria; detta apparecchiatura essendo caratterizzata dal fatto di comprendere un dispositivo di generazione di aria calda atto a preriscaldare detto flusso di aria che guida il tubo di massa fusa all'interno di detta cavit? di stampo. These objects and others which will become apparent hereinafter are achieved by an extrusion and blow molding apparatus, comprising an extrusion head adapted to generate a parison at a mould; said mold having a cavity? of mold in which a piece is formed by blowing with compressed air through a needle that pierces said parison, once said parison ? been introduced and guided in said cavity? by said air flow; said apparatus being characterized in that it comprises a hot air generation device capable of preheating said air flow which guides the molten mass tube inside said cavity; of mold.
Ulteriori caratteristiche e vantaggi risulteranno maggiormente dalla descrizione di forme di realizzazione preferite, ma non esclusive, dell'invenzione, illustrate a titolo indicativo e non limitativo negli uniti disegni, in cui: Further characteristics and advantages will become clearer from the description of preferred, but not exclusive, embodiments of the invention, illustrated for indicative and non-limiting purposes in the attached drawings, in which:
la figura 1 ? una vista prospettica del dispositivo di preriscaldamento dell'apparecchiatura secondo la presente invenzione; figure 1 ? a perspective view of the preheating device of the apparatus according to the present invention;
la figura 2 ? una vista schematica in sezione del dispositivo di preriscaldamento dell'apparecchiatura secondo la presente invenzione; figure 2 ? a schematic sectional view of the preheating device of the apparatus according to the present invention;
la figura 3 ? una vista prospettica in spaccato della calotta del dispositivo secondo l'invenzione; figure 3 ? a perspective cutaway view of the cap of the device according to the invention;
la figura 4 ? una vista in alzato, in sezione, dell'apparecchiatura secondo l'invenzione. figure 4 ? a sectional elevation view of the apparatus according to the invention.
Con riferimento alle figure citate, l'apparecchiatura di estrusione e soffiaggio, secondo l'invenzione, indicata globalmente con il numero di riferimento 1, comprende una testa di estrusione 2 atta a generare un parison in corrispondenza di uno stampo 3 il quale presenta una cavit? di stampo. With reference to the cited figures, the extrusion and blow molding apparatus, according to the invention, globally indicated with the reference number 1, comprises an extrusion head 2 able to generate a parison in correspondence with a mold 3 which has a cavity ? of mold.
Il pezzo ? formato per insufflazione con aria compressa tramite un ago che perfora il parison, una volta che questo ? stato introdotto e guidato nella cavit? dal flusso di aria, preriscaldata o meno, in modo di per s? noto. The piece ? formed by insufflation with compressed air via a needle that pierces the parison, once this ? been introduced and guided into the cavity? from the flow of air, preheated or not, in a way per se? known.
Secondo la presente invenzione, l'apparecchiatura comprende un dispositivo di generazione di aria calda, globalmente indicato con il numero di riferimento 10, atto a preriscaldare il flusso di aria che guida il tubo di massa fusa all'interno della cavit? di stampo. According to the present invention, the apparatus comprises a hot air generating device, globally indicated with the reference number 10, suitable for preheating the air flow which guides the molten mass tube inside the cavity. of mold.
Secondo una forma realizzativa preferita dell'invenzione, il dispositivo di pre-riscaldamento comprende una calotta, in due met?, la quale sigilla l'entrata 12 del parison, in corrispondenza dell'attacco della filiera. According to a preferred embodiment of the invention, the pre-heating device comprises a cap, in two halves, which seals the inlet 12 of the parison, at the attachment of the die.
Il dispositivo 10 comprende un canale laterale 13 il quale convoglia un flusso di aria riscaldata, per esempio tramite elettroriscaldatori o altri sistemi di riscaldamento dell'aria. The device 10 comprises a lateral channel 13 which conveys a flow of heated air, for example by electric heaters or other air heating systems.
Il flusso di aria calda del dispositivo oggetto della presente invenzione sostituisce il cuscino di aria ambiente che, allo stato dell'arte attuale, viene utilizzato per il "galleggiamento" del parison durante l'attraversamento della cavit? di stampo. The hot air flow of the device object of the present invention replaces the cushion of ambient air which, in the current state of the art, is used for the "floating" of the parison as it passes through the cavity. of mold.
Il dispositivo di preriscaldamento secondo la presente invenzione elimina o almeno riduce sostanzialmente la perdita di energia termica da parte del polimero, durante la fase di introduzione nello stampo, ritardando cos? la fase di cristallizzazione del polimero, aumentando il tempo ammissibile di introduzione e consentendo parimenti un pi? accurato profilo assiale/radiale degli spessori attraverso gli usuali sistemi di controllo del parison. The preheating device according to the present invention eliminates or at least substantially reduces the loss of thermal energy by the polymer during the phase of introduction into the mould, thus delaying the the crystallization phase of the polymer, increasing the admissible time of introduction and also allowing a pi? accurate axial/radial profile of the thicknesses through the usual parison control systems.
Si ? in pratica constatato come l'invenzione raggiunga il compito e gli scopi prefissati avendo realizzato un'apparecchiatura che, grazie al dispositivo di preriscaldamento, permette di realizzare pezzi di lunghezza sensibilmente maggiore rispetto ai pezzi prodotti con le macchine di estrusione e soffiaggio tradizionali utilizzati per la produzione di elementi tubolari. Yes ? in practice it has been observed that the invention achieves the intended aim and objects, having provided an apparatus which, thanks to the preheating device, allows to produce pieces of considerably greater length than the pieces produced with traditional extrusion and blow molding machines used for production of tubular elements.
L'apparecchiatura secondo l'invenzione ? suscettibile di numerose modifiche e varianti, tutte rientranti nell'ambito del concetto inventivo; inoltre tutti i dettagli potranno essere sostituiti da elementi tecnicamente equivalenti. The apparatus according to the invention ? susceptible to numerous modifications and variations, all of which are within the scope of the inventive concept; furthermore, all the details may be replaced by technically equivalent elements.
Naturalmente i materiali impiegati, nonch? le dimensioni, potranno essere qualsiasi secondo le esigenze e lo stato della tecnica, Of course the materials used, as well as? the dimensions, may be any according to the requirements and the state of the art,
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102021000019223A IT202100019223A1 (en) | 2021-07-20 | 2021-07-20 | EXTRUSION AND BLOW MOLDING EQUIPMENT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102021000019223A IT202100019223A1 (en) | 2021-07-20 | 2021-07-20 | EXTRUSION AND BLOW MOLDING EQUIPMENT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT202100019223A1 true IT202100019223A1 (en) | 2023-01-20 |
Family
ID=78086795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT102021000019223A IT202100019223A1 (en) | 2021-07-20 | 2021-07-20 | EXTRUSION AND BLOW MOLDING EQUIPMENT |
Country Status (1)
| Country | Link |
|---|---|
| IT (1) | IT202100019223A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02117809A (en) * | 1988-10-27 | 1990-05-02 | Placo Co Ltd | Blow molding device |
| JPH05104613A (en) * | 1991-10-16 | 1993-04-27 | Tonen Chem Corp | Manufacture and device of bent blow molded product |
| DE19845269A1 (en) * | 1998-10-01 | 2000-04-13 | Mbk Maschinenbau Koetke Gmbh | Extrusion of flexible tubular preform into e.g. snaking or spiraling mold, employs air cushion to guide it through before blow-molding into e.g. automobile ventilation-air ducting |
| EP1040904A2 (en) * | 1999-04-01 | 2000-10-04 | Eberhard Ferger | Method and apparatus for manufacture of hollow articles made from thermoplastics material |
| US20020041913A1 (en) * | 2000-10-06 | 2002-04-11 | Sig Blowtec Gmbh & Co. Kg | Mold for suction/blowing system |
| US20050133969A1 (en) | 2003-12-23 | 2005-06-23 | Mario Tietto | Vacuum blow-molding method for producing three-dimensional extruded tubular bodies, vacuum blow-molding device for performing the method, and vacuum blow-molding machine provided with the device |
| DE102005038638A1 (en) * | 2005-08-09 | 2007-02-15 | Maik Hentschel | Proportional blow molding of extruded preforms involves passing tubular preforms supported on cushions of air in gaseous medium passed through cavity of molding tool and introduced under raised pressure on inlet side |
-
2021
- 2021-07-20 IT IT102021000019223A patent/IT202100019223A1/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02117809A (en) * | 1988-10-27 | 1990-05-02 | Placo Co Ltd | Blow molding device |
| JPH05104613A (en) * | 1991-10-16 | 1993-04-27 | Tonen Chem Corp | Manufacture and device of bent blow molded product |
| DE19845269A1 (en) * | 1998-10-01 | 2000-04-13 | Mbk Maschinenbau Koetke Gmbh | Extrusion of flexible tubular preform into e.g. snaking or spiraling mold, employs air cushion to guide it through before blow-molding into e.g. automobile ventilation-air ducting |
| EP1040904A2 (en) * | 1999-04-01 | 2000-10-04 | Eberhard Ferger | Method and apparatus for manufacture of hollow articles made from thermoplastics material |
| US20020041913A1 (en) * | 2000-10-06 | 2002-04-11 | Sig Blowtec Gmbh & Co. Kg | Mold for suction/blowing system |
| US20050133969A1 (en) | 2003-12-23 | 2005-06-23 | Mario Tietto | Vacuum blow-molding method for producing three-dimensional extruded tubular bodies, vacuum blow-molding device for performing the method, and vacuum blow-molding machine provided with the device |
| DE102005038638A1 (en) * | 2005-08-09 | 2007-02-15 | Maik Hentschel | Proportional blow molding of extruded preforms involves passing tubular preforms supported on cushions of air in gaseous medium passed through cavity of molding tool and introduced under raised pressure on inlet side |
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