ITMI20090080A1 - METHOD FOR THE PRODUCTION OF PRESENTATION LENSES. - Google Patents
METHOD FOR THE PRODUCTION OF PRESENTATION LENSES. Download PDFInfo
- Publication number
- ITMI20090080A1 ITMI20090080A1 IT000080A ITMI20090080A ITMI20090080A1 IT MI20090080 A1 ITMI20090080 A1 IT MI20090080A1 IT 000080 A IT000080 A IT 000080A IT MI20090080 A ITMI20090080 A IT MI20090080A IT MI20090080 A1 ITMI20090080 A1 IT MI20090080A1
- Authority
- IT
- Italy
- Prior art keywords
- mold
- lens
- polyethylene terephthalate
- granules
- injection
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 23
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 23
- 239000008187 granular material Substances 0.000 claims description 15
- -1 polyethylene terephthalate Polymers 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000007791 dehumidification Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
- 238000000151 deposition Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 claims 1
- 239000003507 refrigerant Substances 0.000 claims 1
- 238000007493 shaping process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 239000012815 thermoplastic material Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 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
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
- B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
-
- 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
- B29C2045/0096—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor drying the moulding material before injection, e.g. by 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/42—Removing or ejecting moulded articles using means movable from outside the mould between mould parts, e.g. robots
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
Description
"METODO PER LA PRODUZIONE DI LENTI DI PRESENTAZIO-NE" "METHOD FOR THE PRODUCTION OF PRESENTATION LENSES"
D E S C R I Z I O N E DESCRIPTION
Il presente trovato ha come oggetto un metodo per la produzione di lenti di presentazione. The present invention relates to a method for producing presentation lenses.
Come à ̈ noto, le lenti di presentazione, o lenti dimostrative, sono generalmente lenti stampate in materia plastica, realizzate mediante stampi multi-impronta, nei quali viene eseguita l’iniezione della materia plastica, che costituisce la lente stessa. As is known, presentation lenses, or demonstration lenses, are generally lenses molded in plastic material, made by means of multi-impression molds, in which the plastic material, which constitutes the lens itself, is injected.
La materia plastica attualmente utilizzata per la realizzazione delle lenti dimostrative à ̈ il polimetilmetacrilato. The plastic material currently used for the realization of the demonstration lenses is polymethylmethacrylate.
Compito del presente trovato à ̈ quello di mettere a punto un metodo per la produzione di lenti di presentazione che permetta di realizzare lenti dimostrative di qualità e nel contempo di ridurre i costi di produzione. The aim of the present invention is to provide a method for the production of presentation lenses which allows to produce quality demonstration lenses and at the same time to reduce production costs.
Nell’ambito di questo compito, uno scopo del trovato à ̈ quello di realizzare un'apparecchiatura in grado di produrre lenti dimostrative secondo il nuovo metodo, che risulti affidabile ed economicamente competitiva. Within the scope of this aim, an object of the invention is to provide an apparatus capable of producing demonstration lenses according to the new method, which is reliable and economically competitive.
Un ulteriore scopo à ̈ quello di realizzare una lente di presentazione di ottima qualità costituita da un materiale più economico e più vantaggioso anche dal punto di vista ambientale. A further object is to provide an excellent quality presentation lens made of a cheaper and more advantageous material also from the environmental point of view.
Questo ed altri scopi, che meglio appariranno evidenziati in seguito, sono raggiunti da un metodo per la produzione di lenti di presentazione caratterizzato dal fatto di comprendere le seguenti fasi: This and other purposes, which will be better highlighted below, are achieved by a method for the production of presentation lenses characterized by the fact that it comprises the following steps:
- deumidificazione di Polietilene Tereftalato solido in granuli; - trasformazione del Polietilene Tereftalato da solido in granuli a forma liquida tramite riscaldamento; - dehumidification of solid Polyethylene Terephthalate in granules; - transformation of Polyethylene Terephthalate from solid into liquid granules by heating;
- iniezione del Polietilene Tereftalato in forma liquida all’interno di uno stampo; - injection of polyethylene terephthalate in liquid form inside a mold;
- raffreddamento spinto dello stampo, durante la fase di iniezione; - forced cooling of the mold, during the injection phase;
- prelievo e deposito dei pezzi finiti. - picking up and depositing of finished pieces.
La fase di deumidificazione del PET in granuli à ̈ effettuata attraverso un deumidificatore, il quale elimina l'umidità in eccesso presente nel granulo di PET attraverso l'utilizzo di aria compressa filtrata attraverso filtri minerali. The dehumidification phase of PET in granules is carried out through a dehumidifier, which eliminates the excess humidity present in the PET granule through the use of compressed air filtered through mineral filters.
Vantaggiosamente, lo stampo presenta un raffreddamento molto spinto cosicché la forma amorfa del granulo, che in origine à ̈ una forma cristallina che assa alla forma amorfa attraverso il riscaldamento nella parte riscaldante della pressa, venga fissata al l'interno dello stampo freddo. Advantageously, the mold has a very intense cooling so that the amorphous form of the granule, which is originally a crystalline form which takes on the amorphous form through heating in the heating part of the press, is fixed inside the cold mold.
Ulteriori caratteristiche e vantaggi dell'oggetto del presente trovato risulteranno maggiormente evidenziati attraverso un esame della descrizione di una forma di realizzazione preferita, ma non esclusiva, del trovato. Further characteristics and advantages of the object of the present invention will become more evident through an examination of the description of a preferred, but not exclusive, embodiment of the invention.
Il metodo di produzione secondo il presente trovato permette di realizzare lenti di presentazione in Polietilene Tereftalato (PET), anziché in tradizionale polimetilmetacrilato. The production method according to the present invention allows to produce presentation lenses in Polyethylene Terephthalate (PET), instead of in traditional polymethylmethacrylate.
Il metodo comprende la trasformazione del Polietilene Tereftalato solido in granuli, tramite pressa ad iniezione, in forma liquida e la successiva iniezione all’interno di uno stampo studiato per la formazione del pezzo desiderato. The method includes the transformation of solid Polyethylene Terephthalate into granules, by injection press, in liquid form and the subsequent injection inside a mold designed for the formation of the desired piece.
Secondo il presente trovato, prima della fase di iniezione il Polietilene Tereftalato à ̈ sottoposto ad una fase di deumidificazione, effettuata tramite un deumidificatore, il quale elimina l'umidità in eccesso presente nel granulo di PET. According to the present invention, before the injection step the Polyethylene Terephthalate is subjected to a dehumidification step, carried out by means of a dehumidifier, which eliminates the excess humidity present in the PET granule.
La deumidificazione à ̈ effettuata mediante aria compressa, filtrata attraverso filtri minerali. Dehumidification is carried out by means of compressed air, filtered through mineral filters.
La fase di deumidificazione permette di eliminare l'umidità dal granulo di PET, umidità che degraderebbe il granulo stesso. The dehumidification phase allows to eliminate the humidity from the PET granule, humidity which would degrade the granule itself.
Una volta deumidificato il PET Ã ̈ pronto per essere trasformato in lente attraverso lo stampaggio. Once dehumidified, PET is ready to be transformed into a lens through molding.
La fase di stampaggio à ̈ effettuata in condizioni di raffreddamento molto s into affinché il materiale risulti tras arente mantenendo la forma amorfa ottenuta attraverso il riscaldamento nella parte riscaldante della pressa. The molding phase is carried out in very low cooling conditions so that the material is transparent while maintaining the amorphous shape obtained by heating the heating part of the press.
Infatti, il granulo in origine à ̈ cristallino e passa alla forma amorfa, necessaria per diventare trasparente, durante il riscaldamento nella parte riscaldante della pressa. In fact, the granule is originally crystalline and passes to the amorphous form, necessary to become transparent, during heating in the heating part of the press.
Il raffreddamento dello stampo permette di fissare tale forma amorfa all'interno dello stampo. The cooling of the mold allows to fix this amorphous shape inside the mold.
Preferibilmente la fase di stampaggio à ̈ effettuata mantenendo lo stampo ad una temperatura compresa tra i 10 ed i 18 gradi centigradi. Preferably the molding phase is carried out by keeping the mold at a temperature between 10 and 18 degrees centigrade.
Il metodo comprende infine una fase di prelievo e di deposito dei pezzi finiti tramite un robot cartesiano che utilizza la tecnica del vuoto, aspirando i pezzi direttamente dallo stampo e trasportandoli nell'area dedicata al deposito. Finally, the method includes a phase of picking up and depositing the finished pieces by means of a Cartesian robot that uses the vacuum technique, sucking the pieces directly from the mold and transporting them to the area dedicated to the deposit.
Il metodo oggetto del presente trovato à ̈ realizzato tramite un'apparecchiatura che comprende un deumidificatore per materie plastiche, una pressa ad iniezione, uno stampo per iniezione del materiale termoplastico, con condizionamento dedicato per PET, una centralina di refrigerazione per stampi, ed un robot cartesiano, funzionante a vuoto, per il prelievo e il deposito del pezzo finito. The method of the present invention is carried out by means of an apparatus which comprises a dehumidifier for plastic materials, an injection press, a mold for injection of thermoplastic material, with dedicated conditioning for PET, a refrigeration unit for molds, and a robot Cartesian, running empty, for picking up and depositing the finished piece.
Il deumidificatore elimina l'umidità in eccesso presente nel granulo di PET attraverso l'utilizzo di aria compressa filtrata attraverso filtri minerali. The dehumidifier eliminates the excess humidity present in the PET granule through the use of compressed air filtered through mineral filters.
Una volta deumidificato, il PET Ã ̈ pronto per essere trasformato in lente attraverso lo stampo. Once dehumidified, the PET is ready to be transformed into a lens through the mold.
Lo stampo comprende un sistema di raffreddamento molto spinto in modo da mantenere lo stampo stesso ad una temperatura compresa tra i 10 ed i 18 gradi centigradi. The mold includes a very thorough cooling system in order to keep the mold itself at a temperature between 10 and 18 degrees centigrade.
Il sistema di raffreddamento dello stampo comprende ricircoli di liquido refrigerante che arrivano a raffreddare anche il tassello che dà la forma al pezzo. The cooling system of the mold includes recirculations of coolant which also cool the piece that gives the piece its shape.
Il sistema di raffreddamento comprende inoltre una centralina refrigerante a circuito chiuso, in grado di dare al liquido refrigerante una temperatura compresa tra i 7 ed i 20 gradi centigradi. The cooling system also includes a closed-circuit refrigerating unit, capable of giving the coolant a temperature between 7 and 20 degrees centigrade.
Secondo il presente trovato l'apparecchiatura à ̈ inoltre costituita da un robot cartesiano che utilizza la tecnica del vuoto, aspirando i pezzi direttamente dallo stampo e trasportandoli nell'area dedicata al deposito. According to the present invention, the apparatus is also constituted by a Cartesian robot which uses the vacuum technique, sucking the pieces directly from the mold and transporting them to the area dedicated to storage.
Si à ̈ in pratica constatato che il trovato raggiunge il compito e gli scopi prefissati. In practice it has been found that the invention achieves the intended aim and objects.
Il metodo e l'apparecchiatura in precedenza descritti permettono infatti di produrre lenti dimostrative in Polietilene Tereftalato (PET), di qualità analoga o superiore rispetto alle lenti realizzate tradizionalmente, ma con costi di produzione sensibilmente ridotti grazie al minor costo del Polietilene Tereftalato rispetto ad altri materiali termoplastici utilizzati precedentemente quali il polimetilmetacrilato. The method and the equipment previously described allow in fact to produce demonstration lenses in Polyethylene Terephthalate (PET), of similar or superior quality compared to traditionally made lenses, but with significantly reduced production costs thanks to the lower cost of Polyethylene Terephthalate compared to others. previously used thermoplastic materials such as polymethylmethacrylate.
Naturalmente i materiali impiegati, nonché le dimensioni, potranno essere qualsiasi, secondo le esigenze. Naturally, the materials used, as well as the dimensions, may be any according to requirements.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI2009A000080A IT1393078B1 (en) | 2009-01-26 | 2009-01-26 | METHOD FOR THE PRODUCTION OF PRESENTATION LENSES. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI2009A000080A IT1393078B1 (en) | 2009-01-26 | 2009-01-26 | METHOD FOR THE PRODUCTION OF PRESENTATION LENSES. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ITMI20090080A1 true ITMI20090080A1 (en) | 2010-07-27 |
| IT1393078B1 IT1393078B1 (en) | 2012-04-11 |
Family
ID=41258731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ITMI2009A000080A IT1393078B1 (en) | 2009-01-26 | 2009-01-26 | METHOD FOR THE PRODUCTION OF PRESENTATION LENSES. |
Country Status (1)
| Country | Link |
|---|---|
| IT (1) | IT1393078B1 (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0821979A (en) * | 1994-07-04 | 1996-01-23 | Masahito Takeuchi | Demonstration lens blank for spectacles and production of demonstration lens formed by using the same |
| EP0881246A2 (en) * | 1997-05-28 | 1998-12-02 | Shimadzu Corporation | Biodegradable resin for forming spectacle-molded body and spectacle-molded body |
| JP2000015662A (en) * | 1998-07-06 | 2000-01-18 | Canon Inc | Method for supplying resin material for molding machine, molding, molding machine, and resin material supplying apparatus for molding machine |
| JP2001018266A (en) * | 1999-07-05 | 2001-01-23 | Yushin Precision Equipment Co Ltd | Injection molded product taking-out apparatus |
| JP2001028266A (en) * | 1999-07-06 | 2001-01-30 | Mitsubishi Chemicals Corp | Battery electrode containing surface modifying component, battery, and manufacture thereof |
| WO2002020254A1 (en) * | 2000-09-08 | 2002-03-14 | Sola International, Inc | Process for molding thermoplastic lenses and, steeply curved and/or thin lenses produced thereby |
| US20040232030A1 (en) * | 2003-05-19 | 2004-11-25 | Tomoaki Koseki | PET resin mold processed goods |
| WO2005077628A1 (en) * | 2004-02-16 | 2005-08-25 | Plastic Systems S.P.A. | Process and plant for dehumidification, heating and injection moulding of granulated plastics materials |
-
2009
- 2009-01-26 IT ITMI2009A000080A patent/IT1393078B1/en active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0821979A (en) * | 1994-07-04 | 1996-01-23 | Masahito Takeuchi | Demonstration lens blank for spectacles and production of demonstration lens formed by using the same |
| EP0881246A2 (en) * | 1997-05-28 | 1998-12-02 | Shimadzu Corporation | Biodegradable resin for forming spectacle-molded body and spectacle-molded body |
| JP2000015662A (en) * | 1998-07-06 | 2000-01-18 | Canon Inc | Method for supplying resin material for molding machine, molding, molding machine, and resin material supplying apparatus for molding machine |
| JP2001018266A (en) * | 1999-07-05 | 2001-01-23 | Yushin Precision Equipment Co Ltd | Injection molded product taking-out apparatus |
| JP2001028266A (en) * | 1999-07-06 | 2001-01-30 | Mitsubishi Chemicals Corp | Battery electrode containing surface modifying component, battery, and manufacture thereof |
| WO2002020254A1 (en) * | 2000-09-08 | 2002-03-14 | Sola International, Inc | Process for molding thermoplastic lenses and, steeply curved and/or thin lenses produced thereby |
| US20040232030A1 (en) * | 2003-05-19 | 2004-11-25 | Tomoaki Koseki | PET resin mold processed goods |
| WO2005077628A1 (en) * | 2004-02-16 | 2005-08-25 | Plastic Systems S.P.A. | Process and plant for dehumidification, heating and injection moulding of granulated plastics materials |
Non-Patent Citations (2)
| Title |
|---|
| DATABASE WPI Week 200014, Derwent World Patents Index; AN 2000-155497, XP002554515 * |
| DATABASE WPI Week 200124, Derwent World Patents Index; AN 2001-229477, XP002554514 * |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1393078B1 (en) | 2012-04-11 |
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