ITTO960393A1 - PROCEDURE FOR THE PRODUCTION BY MOLDING OF HOLLOW ARTICLES OF PLASTIC MATERIALS AND ARTICLES OBTAINED SO. - Google Patents
PROCEDURE FOR THE PRODUCTION BY MOLDING OF HOLLOW ARTICLES OF PLASTIC MATERIALS AND ARTICLES OBTAINED SO. Download PDFInfo
- Publication number
- ITTO960393A1 ITTO960393A1 IT96TO000393D ITTO960393D ITTO960393A1 IT TO960393 A1 ITTO960393 A1 IT TO960393A1 IT 96TO000393 D IT96TO000393 D IT 96TO000393D IT TO960393 D ITTO960393 D IT TO960393D IT TO960393 A1 ITTO960393 A1 IT TO960393A1
- Authority
- IT
- Italy
- Prior art keywords
- core
- plastic material
- process according
- mold
- liquid
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims description 46
- 239000004033 plastic Substances 0.000 title claims description 34
- 229920003023 plastic Polymers 0.000 title claims description 34
- 238000000034 method Methods 0.000 title claims description 32
- 238000000465 moulding Methods 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000007788 liquid Substances 0.000 claims description 26
- 229920001187 thermosetting polymer Polymers 0.000 claims description 11
- -1 polyethylene Polymers 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000004952 Polyamide Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 230000008014 freezing Effects 0.000 claims description 4
- 238000007710 freezing Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 229920002492 poly(sulfone) Polymers 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 239000012815 thermoplastic material Substances 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 238000000071 blow moulding Methods 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 2
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims 1
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000011151 fibre-reinforced plastic Substances 0.000 claims 1
- 150000002334 glycols Chemical class 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 229920001230 polyarylate Polymers 0.000 claims 1
- 238000000605 extraction Methods 0.000 description 5
- 229920001169 thermoplastic Polymers 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000001721 transfer moulding 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
- 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
- B29C45/44—Removing or ejecting moulded articles for undercut articles
- B29C45/4457—Removing or ejecting moulded articles for undercut articles using fusible, soluble or destructible cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/0011—Moulds or cores; Details thereof or accessories therefor thin-walled moulds
- B29C33/0016—Lost moulds, e.g. staying on the moulded object
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
- B29C33/08—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means for dielectric heating
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/52—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles soluble or fusible
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14836—Preventing damage of inserts during injection, e.g. collapse of hollow inserts, breakage
-
- 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
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/12—Dielectric heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2022/00—Hollow articles
Description
DESCRIZIONE dell'Invenzione industriale dal titolo: "Procedimento per la produzione mediante stampaggio di articoli cavi di materiale plastico ed articoli cosi ottenuti" DESCRIPTION of the industrial invention entitled: "Process for the production by molding of hollow articles of plastic material and articles thus obtained"
La presente invenzione si riferisce ad un procedimento per la produzione mediante stampaggio di articoli cavi di materiale plastico. The present invention relates to a process for the production by molding of hollow articles of plastic material.
Nelle tecnologie di stampaggio di articoli termoplastici cavi è nota la tecnica cosiddetta delle "anime fusibili", che prevede l'inserimento nello stampo di un’anima sagomata riproducente la forma della cavità che si intende realizzare ed il sovrastampaggio del materiale plastico sull’anima internamente allo stampo. In tale tecnologia, l'anima fusibile è generalmente formata da un metallo o lega metallica bassofondente, ad esempio da una lega a base di bismuto. In the technologies of molding of hollow thermoplastic articles, the so-called "fusible core" technique is known, which involves the insertion in the mold of a shaped core reproducing the shape of the cavity to be made and the overmoulding of the plastic material on the core internally to the mold. In this technology, the fusible core is generally formed of a low-melting metal or metal alloy, for example a bismuth-based alloy.
A seguito dello stampaggio dell’articolo cavo e della sua estrazione dallo stampo, l'anima viene fusa generalmente in bagno d'olio ed il metallo e recuperato . Following the molding of the hollow article and its extraction from the mold, the core is generally melted in an oil bath and the metal is recovered.
Oggetto della presente invenzione è un procedimento per la produzione mediante stampaggio di un articolo cavo di materiale plastico, in cui nello stampo è inserita un’anima sagomata riproducente la forma della cavità ed il materiale plastico è sovrastampato sull'anima, internamente allo stampo, caratterizzato dal fatto che come anima si utilizza un corpo cavo di materiale plastico riempito con una sostanza liquida a temperatura ambiente. The object of the present invention is a process for the production by molding of a hollow article of plastic material, in which a shaped core reproducing the shape of the cavity is inserted in the mold and the plastic material is overmolded on the core, inside the mold, characterized from the fact that a hollow body of plastic material filled with a liquid substance at room temperature is used as the core.
Nella forma di attuazione preferita del procedimento secondo l'invenzione, il corpo cavo costituente l'anima è un involucro o contenitore di materiale plastico a parete sottile, che di per sé non presenta una resistenza strutturale sufficiente a sopportare la pressione e resistere alla temperatura che si stabiliscono internamente allo stampo; in questa forma di attuazione, l’anima è inserita nello stampo previo congelamento del liquido ivi contenuto ed il materiale plastico è alimentato internamente .ìlio stampo, quando il liquido internamente all’anima si trova allo stato di congelamento. Il liquido congelato internamente all'anima, inserito nello stampo, contribuisce così alla resistenza strutturale dell'anima nel corso dello stampaggio. In the preferred embodiment of the method according to the invention, the hollow body constituting the core is a casing or container of thin-walled plastic material, which in itself does not have a structural strength sufficient to withstand the pressure and withstand the temperature that they are established inside the mold; in this embodiment, the core is inserted into the mold after freezing the liquid contained therein and the plastic material is fed internally to the mold, when the liquid inside the core is in a frozen state. The liquid frozen inside the core, inserted in the mold, thus contributes to the structural strength of the core during molding.
Il procedimento secondo l’invenzione consente la produzione di articoli cavi sia di materiale plastico termoplastico, sia di materiale plastico termoindurente. Nel caso di impiego di materiale plastico termoindurente, preferibilmente, il procedimento comprende, al fine di ottenere la corretta polimerizzazione del materiale plastico, uno stadio di riscaldamento del liquido congelato internamente all'anima, per provocarne la liquefazione ed innalzare la temperatura interna fino ad una temperatura atta alla polimerizzazione del termoindurente. The process according to the invention allows the production of hollow articles both of thermoplastic plastic material and of thermosetting plastic material. In the case of use of thermosetting plastic material, preferably, the process comprises, in order to obtain the correct polymerization of the plastic material, a stage of heating the liquid frozen inside the core, to cause liquefaction and raise the internal temperature up to a temperature suitable for the polymerization of the thermosetting agent.
La fase di riscaldamento può essere agevolmente effettuata mediante l'applicazione di un campo di alte frequenze internamente allo stampo. Le temperature finali di riscaldamento sono variabili in funzione del liquido utilizzato all'interno dell'anima ed in funzione del materiale termoindurente impiegato . The heating phase can be easily carried out by applying a high frequency field inside the mold. The final heating temperatures are variable according to the liquid used inside the core and according to the thermosetting material used.
Si intende tuttavia che l’operazione di riscaldamento dell'anima potrà essere effettuato anche in caso di impiego di materiali termoplastici, qualora sia desiderato, in funzione della specifica geometria del pezzo, ottenere una più rapida liquefazione del liquido congelato. However, it is understood that the core heating operation can also be carried out in the case of using thermoplastic materials, if it is desired, depending on the specific geometry of the piece, to obtain a more rapid liquefaction of the frozen liquid.
Ulteriori caratteristiche e vantaggi del procedimento secondo la presente invenzione risulteranno evidenti nel corso della descrizione dettagliata che segue, fornita a puro titolo di esempio non limitativo, effettuata con riferimento al disegno annesso, in cui è illustrata in modo schematico un'apparecchiatura per l’attuazione del procedimento. Further characteristics and advantages of the process according to the present invention will become evident in the course of the detailed description that follows, provided purely by way of non-limiting example, carried out with reference to the attached drawing, in which an apparatus for implementing of the procedure.
L'apparecchiatura illustrata è costituita da una convenzionale pressa per stampaggio ad iniezione per materiali plastici o termoindurenti. Si intende che il procedimento potrà essere applicato in qualsiasi procedimento di formatura di materiali plastici, quali stampaggio ad iniezione, a compressione, ad inietto-compressione ed a trasferimento. The illustrated apparatus is constituted by a conventional injection molding press for plastic or thermosetting materials. It is understood that the process can be applied in any plastic material forming process, such as injection, compression, injection-compression and transfer molding.
Nella forma di attuazione illustrata, il materiale plastico allo stato granulare, alimentato alla pressa ad iniezione tramite una tramoggia di carico 2, viene compresso e riscaldato internamente alla pressa fino allo stato fuso. Uno stantuffo 4 inietta il materiale fuso internamente ad uno stampo 6, formato da due semistampi 8, 10. In the illustrated embodiment, the plastic material in the granular state, fed to the injection molding machine by means of a loading hopper 2, is compressed and heated inside the press to the molten state. A plunger 4 injects the molten material inside a mold 6, formed by two half-molds 8, 10.
Con 12 è indicata un’anima secondo l’invenzione, la cui superficie esterna riproduce la forma della cavità dell'articolo cavo che si intende realizzare mediante stampaggio. L’anima 12 è costituita da un corpo cavo di materiale plastico, quale ottenibile mediante la tecnica convenzionale di soffiaggio (blow-moulding) . Come è noto, con tale tecnica è possibile ottenere corpi cavi anche di forma particolarmente complessa. Grazie all’impiego di un'anima 12 di materiale plastico ottenuta per soffiaggio, il procedimento secondo l’invenzione consente cosi di produrre articoli cavi, quali in particolare elementi strutturali con elevate proprietà di resistenza meccanica che, necessariamente, presentano cavità complesse con nervature e scanalature. 12 indicates a core according to the invention, whose external surface reproduces the shape of the cavity of the hollow article that is to be made by molding. The core 12 consists of a hollow body of plastic material, which can be obtained by means of the conventional blow-molding technique. As is known, with this technique it is possible to obtain hollow bodies even with a particularly complex shape. Thanks to the use of a core 12 of plastic material obtained by blowing, the process according to the invention thus allows to produce hollow articles, such as in particular structural elements with high mechanical resistance properties which necessarily have complex cavities with ribs and grooves.
L’anima 12 presenta preferibilmente mezzi atti a consentire l’evacuazione del liquido ivi contenuto a seguito dell’estrazione dell’articolo stampato dallo stampo 6; tali mezzi possono ad esempio essere costituiti da un’apertura provvista di un tappo, ad esempio un tappo a vite. Si intende che la geometria dell'articolo stampato dovrà essere tale da consentire l’apertura dell’anima 12 per recuperare il liquido o, in altre parole, l’apertura nell'anima dovrà essere disposta in posizione, relativamente alla geometria dell’articolo stampato, atta a consentire 1 recupero del liquido. The core 12 preferably has means suitable for allowing the evacuation of the liquid contained therein following the extraction of the molded article from the mold 6; such means can for example consist of an opening provided with a cap, for example a screw cap. It is understood that the geometry of the molded article must be such as to allow the opening of the core 12 to recover the liquid or, in other words, the opening in the core must be arranged in position, relative to the geometry of the molded article. , suitable for allowing the recovery of the liquid.
I materiali plastici atti alla produzione dell'anima 12 possono essere del tutto simili, per qualità e spessore, a quelli utilizzati per i normali recipienti, destinati ad esempio a prodotti detergenti per uso domestico, quali polivinilcloruro, polipropilene, polietilene, polietilentereftalato ,poliammlde e simili. Nel caso in cui l'anima 12 debba contribuire alla resistenza strutturale del pezzo stampato, si intende che per questa potranno essere adottati anche materiali più sofisticati, quali ad esempio polisulfoni e poliàrilati. The plastic materials suitable for the production of the core 12 can be entirely similar, in quality and thickness, to those used for normal containers, intended for example for cleaning products for domestic use, such as polyvinyl chloride, polypropylene, polyethylene, polyethylene terephthalate, polyamide and similar. In the event that the core 12 has to contribute to the structural strength of the molded piece, it is understood that more sophisticated materials, such as for example polysulfones and polyaclates, can also be used for this.
L’anima 12 è riempita con un liquido 18 caratterizzato da rapido congelamento, quale in particolare acqua o glicole, particolarmente glicole monoetilenico, puro o diluito. Si intende che l'invenzione non è in alcun modo limitata dalla scelta del liquido utilizzato. The core 12 is filled with a liquid 18 characterized by rapid freezing, such as in particular water or glycol, particularly monoethylene glycol, pure or diluted. It is understood that the invention is in no way limited by the choice of the liquid used.
I materiali plastici utilizzati per la produzione dell'articolo cavo possono essere scelti in un’ampia gamma di materiali termoplastici e termoindurenti e sono eventualmente rinforzati con cariche e fibre, quali fibre di vetro e carbonio. A titolo di esempio, tali materiali potranno essere scelti tra poliammidi, polipropilene, polisulfoni, poliesteri e compounds. The plastic materials used for the production of the hollow article can be chosen from a wide range of thermoplastic and thermosetting materials and are possibly reinforced with fillers and fibers, such as glass and carbon fibers. By way of example, such materials can be chosen from polyamides, polypropylene, polysulfones, polyesters and compounds.
Particolarmente nel caso di impiego di materiali termoplastici, il procedimento comprende, nella sua forma di attuazione preferita, le seguenti operazioni : Particularly in the case of use of thermoplastic materials, the process comprises, in its preferred embodiment, the following operations:
a) congelamento del liquido contenuto nell’anima, b) inserimento dell'anima nello stampo, a) freezing of the liquid contained in the core, b) insertion of the core into the mold,
c) chiusura dello stampo sotto pressa, c) closing of the mold under the press,
d) iniezione del termoplastico, d) injection of thermoplastic,
e) apertura dello stampo, e) opening the mold,
f) estrazione del pezzo, e f) extraction of the piece, e
g) recupero del liquido. g) liquid recovery.
Nel caso di impiego di materiali termoindurenti, le operazioni d)-g) sopra citate sono preferibilmente sostituite dalle seguenti operazioni: d’) iniezione del termoindurente, In the case of use of thermosetting materials, the operations d) -g) mentioned above are preferably replaced by the following operations: d ') injection of the thermosetting agent,
e') riscaldamento del liquido con alte frequenze, f') apertura dello stampo, e ') heating of the liquid with high frequencies, f') opening of the mold,
g’) estrazione del pezzo, e g ') extraction of the piece, e
h ') recupero del liquido. h ') liquid recovery.
Come si è precedentemente indicato, la fase del riscaldamento del liquido con alte frequenze potrà essere applicata, qualora desiderato, anche nel caso di impiego di materiali termoplastici per accelerare il cambiamento di stato del liquido congelato. As previously indicated, the phase of heating the liquid with high frequencies can be applied, if desired, even in the case of using thermoplastic materials to accelerate the change of state of the frozen liquid.
Per l’applicazione del campo di alte frequenze, i due 3emistampi 8, 10 costituenti lo stampo 6 possono essere dotati di emettitori e ricevitori 14, 16, localizzati all'interno dei due semistampi 8, 10, in posizione atta a generare un campo di alte frequenze che interferisce con il liquido contenuto nell'anima 12. Per evitare la formazione di condense sulla superficie dell’anima 12, è raccomandabile operare in ambiente ad umidità controllata. For the application of the high frequency field, the two 3 half-molds 8, 10 making up the mold 6 can be equipped with emitters and receivers 14, 16, located inside the two half-molds 8, 10, in a position suitable for generating a high frequencies which interferes with the liquid contained in the core 12. To avoid the formation of condensation on the surface of the core 12, it is recommended to operate in an environment with controlled humidity.
A seguito dell’estrazione del pezzo e dell’evacuazione del liquido, l'anima 12 di materiale plastico resta inglobata internamente al pezzo e può contribuire alla resistenza strutturale del pezzo. Si intende che i materiali plastici costituenti l’anima 12 ed il materiale plastico costituente il pezzo dovranno essere scelti in modo da essere mutuamente compatibili. Following the extraction of the piece and the evacuation of the liquid, the core 12 of plastic material remains incorporated inside the piece and can contribute to the structural strength of the piece. It is understood that the plastic materials making up the core 12 and the plastic material making up the piece must be chosen so as to be mutually compatible.
Si intende che, fermo restando il principio dell’invenzione, i modi di attuazione ed i particolari di realizzazione potranno essere ampiamente variati rispetto a quanto descritto ed illustrato. It is understood that, without prejudice to the principle of the invention, the implementation methods and construction details may be widely varied with respect to what is described and illustrated.
Claims (17)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO960393A ITTO960393A0 (en) | 1996-05-13 | 1996-05-13 | PROCEDURE FOR THE PRODUCTION BY MOLDING OF HOLLOW ARTICLES OF PLASTIC MATERIALS AND ARTICLES OBTAINED SO. |
Publications (2)
Publication Number | Publication Date |
---|---|
ITTO960393A1 true ITTO960393A1 (en) | 1997-11-13 |
IT1285100B1 IT1285100B1 (en) | 1998-06-03 |
Family
ID=11414628
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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IT96TO000393D IT1285100B1 (en) | 1996-05-13 | 1996-05-13 | PROCEDURE FOR THE PRODUCTION BY MOLDING OF HOLLOW ARTICLES OF PLASTIC MATERIALS AND ARTICLES OBTAINED SO. |
ITTO960393A ITTO960393A0 (en) | 1996-05-13 | 1996-05-13 | PROCEDURE FOR THE PRODUCTION BY MOLDING OF HOLLOW ARTICLES OF PLASTIC MATERIALS AND ARTICLES OBTAINED SO. |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ITTO960393A ITTO960393A0 (en) | 1996-05-13 | 1996-05-13 | PROCEDURE FOR THE PRODUCTION BY MOLDING OF HOLLOW ARTICLES OF PLASTIC MATERIALS AND ARTICLES OBTAINED SO. |
Country Status (1)
Country | Link |
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IT (2) | IT1285100B1 (en) |
-
1996
- 1996-05-13 IT IT96TO000393D patent/IT1285100B1/en active IP Right Grant
- 1996-05-13 IT ITTO960393A patent/ITTO960393A0/en active IP Right Grant
Also Published As
Publication number | Publication date |
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ITTO960393A0 (en) | 1996-05-13 |
IT1285100B1 (en) | 1998-06-03 |
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