ITMI20081491A1 - MULTILAYER FILM IN BIODEGRADABLE MATERIAL AND PROCESS FOR THE PRODUCTION OF THAT FILM - Google Patents
MULTILAYER FILM IN BIODEGRADABLE MATERIAL AND PROCESS FOR THE PRODUCTION OF THAT FILMInfo
- Publication number
- ITMI20081491A1 ITMI20081491A1 IT001491A ITMI20081491A ITMI20081491A1 IT MI20081491 A1 ITMI20081491 A1 IT MI20081491A1 IT 001491 A IT001491 A IT 001491A IT MI20081491 A ITMI20081491 A IT MI20081491A IT MI20081491 A1 ITMI20081491 A1 IT MI20081491A1
- Authority
- IT
- Italy
- Prior art keywords
- layers
- film
- film according
- coextrusion
- process according
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 15
- 238000004519 manufacturing process Methods 0.000 title description 5
- 229920002472 Starch Polymers 0.000 claims description 10
- 235000019698 starch Nutrition 0.000 claims description 10
- 230000009477 glass transition Effects 0.000 claims description 9
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 9
- 239000004626 polylactic acid Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 6
- 239000008107 starch Substances 0.000 claims description 6
- 239000008187 granular material Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000003490 calendering Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 description 6
- 238000003475 lamination Methods 0.000 description 3
- 240000008415 Lactuca sativa Species 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 235000012045 salad Nutrition 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
-
- 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
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
- B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
Description
DESCRIZIONE DESCRIPTION
Forma oggetto del presente trovato una pellicola multistrato in materiale biodegradabile e compostabile e un processo per la produzione di tale pellicola. The present invention relates to a multilayer film made of biodegradable and compostable material and a process for the production of this film.
E' nota, nella tecnica di imballaggio e/o confezionamento di prodotti vari, la necessità di utilizzare pellicole plastiche atte ad avvolgere e sigillare il prodotto da confezionare. In the packaging and / or packaging technique of various products, the need to use plastic films suitable for wrapping and sealing the product to be packaged is known.
E' anche noto che per tali pellicole il requisito fondamentale, sempre più richiesto, à ̈ quello della biodegradabilità e della compostabilità secondo la attuale norma comunitaria EN 13432. It is also known that for these films the fundamental requirement, increasingly requested, is that of biodegradability and compostibility according to the current Community standard EN 13432.
Sono state pertanto realizzate pellicole a base di componenti biodegradabili quali gli amidi, ad esempio di mais, e simili, oppure gli acidi polilattici (PLA), i quali vengono alimentati a rispettivi estrusori e fatti passare attraverso rispettive calandre per formare la pellicola secondo tecniche convenzionali, con avvolgimento finale della stessa su bobina. Therefore, films have been produced based on biodegradable components such as starches, for example corn, and the like, or polylactic acids (PLA), which are fed to respective extruders and passed through respective calenders to form the film according to conventional techniques. , with final winding of the same on a reel.
Le pellicole così ottenute presentano caratteristiche molto diverse che ne limitano di fatto le possibilità di utilizzo in quanto: The films thus obtained have very different characteristics which actually limit their possibilities of use as:
- la pellicola ottenuta da un amido, pur presentando una elevata morbidezza che la rende difficilmente lacerabile e quindi adatta alla realizzazione di buste per pesi non elevati, risulta tuttavia sostanzialmente opaca (colore biancastro) non consentendo il controllo visivo del prodotto confezionato , - the film obtained from a starch, while presenting a high softness which makes it difficult to tear and therefore suitable for making envelopes for low weights, is nevertheless substantially opaque (whitish color) not allowing visual control of the packaged product,
la pellicola prodotta da PLA risulta, al contrario, perfettamente trasparente, e quindi adatta all'imballo di prodotti alimentari quali insalate e simili, ma, nel contempo, anche molto fragile e conseguentemente soggetta a rotture. the film produced by PLA is, on the contrary, perfectly transparent, and therefore suitable for the packaging of food products such as salads and the like, but, at the same time, also very fragile and consequently subject to breakage.
Oltre a ciò la pellicola ottenuta da PLA non à ̈ realizzabile per mezzo di procedimenti standardizzati ad alta produzione quali l'estrusione in bolla. In addition to this, the film obtained from PLA is not achievable by means of standardized high production processes such as blown extrusion.
Si pone pertanto il problema tecnico di realizzare una pellicola in materiale biodegradabile che presenti caratteristiche di trasparenza simili a quelle delle pellicole ottenute da PLA, ma, nel contempo, caratteristiche di ridotta fragilità simili a quelle delle pellicole ottenute da amidi. Nell'ambito di tale problema si richiede inoltre che tale pellicola sia ottenibile tramite macchinari di tipo convenzionale di basso costo e di elevato rendimento . The technical problem therefore arises of making a film in biodegradable material which has transparency characteristics similar to those of films obtained from PLA, but, at the same time, characteristics of reduced brittleness similar to those of films obtained from starches. In the context of this problem, it is also required that this film be obtainable by means of low-cost and high-performance conventional machinery.
Tali risultati sono ottenuti secondo il presente trovato da una pellicola secondo le caratteristiche di rivendicazione 1 e da un processo per la produzione di tale pellicola secondo le caratteristiche di rivendicazione 15. These results are obtained according to the present invention by a film according to the characteristics of claim 1 and by a process for the production of this film according to the characteristics of claim 15.
Maggiori dettagli potranno essere rilevati dalla seguente descrizione di un esempio non limitativo di attuazione dell'oggetto del presente trovato effettuata con riferimento ai disegni allegati, in cui si mostra: More details can be found from the following description of a non-limiting example of embodiment of the object of the present invention made with reference to the attached drawings, which show:
in figura 1 : una vista laterale schematica di un estrusore a bolla per la produzione di una pellicola secondo il presente trovato ; in figure 1: a schematic side view of a bubble extruder for the production of a film according to the present invention;
in figura 2 una vista in pianta dell'estrusore di fig.l; in Figure 2 a plan view of the extruder of Figure 1;
in figura 3 una sezione schematica parziale evidenziante il materiale in uscita dalla testa di estrusione e in ingresso all'anello di raffreddamento, e in figure 3 a partial schematic section showing the material exiting the extrusion head and entering the cooling ring, and
in figura 4: la pellicola secondo il presente trovato . in figure 4: the film according to the present invention.
La pellicola secondo il presente trovato à ̈ una pellicola multistrato, che comprende almeno due strati di differenti materiali, di cui uno interno A ottenuto da amidi e uno esterno B ottenuto da un acido polilattico, tutti biodegradabili. The film according to the present invention is a multilayer film, which comprises at least two layers of different materials, one of which is internal A obtained from starches and an external one B obtained from a polylactic acid, all biodegradable.
Secondo una forma preferita di attuazione, formante oggetto della dettagliata descrizione che segue relativa ad un esempio particolare, la pellicola à ̈ composta da almeno uno strato interno A di materiale ottenuto da amidi e almeno due strati esterni B che possono essere disposti da un solo lato dello strato esterno A-B-B, oppure contrapposti allo strato interno B-A-B, e formati da un materiale ottenuto da un acido polilattico (PLA). According to a preferred embodiment, which is the subject of the detailed description that follows relating to a particular example, the film is composed of at least one internal layer A of material obtained from starch and at least two external layers B which can be arranged on one side only. of the outer layer A-B-B, or opposed to the inner layer B-A-B, and formed by a material obtained from a polylactic acid (PLA).
Secondo forme preferite di attuazione si prevede anche che gli spessori dello strato A interno e degli strati B esterni siano tali da determinare rapporti A su B compresi tra 0,25 < A/B < 10. According to preferred embodiments, it is also envisaged that the thicknesses of the internal layer A and of the external B layers are such as to determine ratios A on B comprised between 0.25 <A / B <10.
Si prevede inoltre che i due strati del componente esterno B possano essere tra loro uguali con temperatura di transizione vetrosa compresa tra 70°C e 90°C, preferibilmente tra 75°C e 85°C, il che rende la pellicola particolarmente adatta all 'utilizzo nella termoformatura, termoretrazione, laminazione e carta e a cartoncino e laminazione con altri materiali biodegradabili e compostabili e/o laminazione ad altri film poliolef inici quali polietilene ad alta e bassa densità molecolare, poliesteri, polipropileni, PVC, PET, cellulosa, cellophane . It is also envisaged that the two layers of the external component B can be equal to each other with a glass transition temperature between 70 ° C and 90 ° C, preferably between 75 ° C and 85 ° C, which makes the film particularly suitable for use in thermoforming, shrinking, lamination and paper and cardboard and lamination with other biodegradable and compostable materials and / or lamination with other polyolef inic films such as high and low molecular density polyethylene, polyesters, polypropylenes, PVC, PET, cellulose, cellophane.
Alternativamente si prevede che gli strati esterni B possano essere tra loro differenti; in tal caso uno dei due prevede temperatura di transizione vetrosa compresa tra 70°C e 90°C, preferibilmente tra 75°C e 85°C, mentre l'altro prevede temperatura di transizione vetrosa compresa tra 45°C e 75°C, preferibilmente tra 55°C e 65°C. Alternatively, it is envisaged that the external layers B can be different from each other; in this case one of the two provides for a glass transition temperature between 70 ° C and 90 ° C, preferably between 75 ° C and 85 ° C, while the other has a glass transition temperature between 45 ° C and 75 ° C, preferably between 55 ° C and 65 ° C.
In entrambi i casi di strati di uguale o differente spessore, la pellicola risulta anche adatta all 'utilizzo diretto su macchine confezionatrici, automatiche, per l'imballo verticale ed orizzontale e/o l'applicazione a coperchi per vaschette per prodotti alimentari e/o di quarta gamma quali le insalate lavate e pronte all'uso. In both cases of layers of equal or different thickness, the film is also suitable for direct use on automatic packaging machines, for vertical and horizontal packaging and / or application to lids for trays for food products and / or fourth range such as washed and ready-to-use salads.
Da prove di laboratorio effettuate su una pellicola campione formata da tre strati A-B-A- con spessori relativi 25%-50%-25% Ã ̈ risultato che la pellicola secondo il presente trovato presenta i seguenti valori dei parametri fondamentali: From laboratory tests carried out on a sample film formed by three layers A-B-A- with relative thicknesses of 25% -50% -25% it has emerged that the film according to the present invention has the following values of the fundamental parameters:
RESISTENZA ALLA TRAZIONE SM (sensomacchina)-ASTM D882 TRACTION RESISTANCE SM (sensomachine) -ASTM D882
compresitra30nM e60nM including between 30nM and 60nM
RESISTENZA ALLA TRAZIONE ST (sensotrasversale)-ASTM D882 TRACTION RESISTANCE ST (transversal sense) -ASTM D882
compresitra30nM e60nM including between 30nM and 60nM
MODULO DIYOUNG (ELASTICITÀ’)-ASTM 882 DIYOUNG MODULE (ELASTICITY) - ASTM 882
compresitra 500MPa e1000MPa between 500MPa and 1000MPa
ALLUNGAMENTO SM -ASTM 88210 ELONGATION SM -ASTM 88210
compresitra10% e50% between 10% and 50%
LACERAZIONE - INIZIO - ASTM DI 938 TEAR - START - ASTM OF 938
compresi tra 30 N/mm e 150 N/mm between 30 N / mm and 150 N / mm
LACERAZIONE - PROPAGAZIONE - ASTM DI 938 TEAR - PROPAGATION - ASTM OF 938
compresi tra 30 N/mm e 150 N/mm between 30 N / mm and 150 N / mm
TRASPARENZA TRANSPARENCY
compresa tra 4% e 8% HAZE between 4% and 8% HAZE
Come illustrato in fig.l e assunte per sola comodità di descrizione e senza significato limitativo una terna di riferimento con direzioni rispettivamente longitudinale X-X, trasversale Y-Y e verticale Z-Z, si prevede inoltre un processo per la formazione della pellicola multistrato biodegradabile e compostabile secondo il presente trovato che comprende le seguenti fasi: As illustrated in Fig. 1 and assuming for convenience of description and without limiting meaning a reference frame with longitudinal X-X, transversal Y-Y and vertical Z-Z directions respectively, a process is also provided for the formation of the biodegradable and compostable multilayer film according to the present invention which includes the following steps:
predisposizione di un'apparecchiatura 100 di coestrusione ad almeno due strati, comprendente un estrusore centrale 110 e almeno un estrusore 120,130, laterale rispetto alla testa 140 di coestrusione a due strati; la quale prevede, tra l'altro, un anello di raffreddamento 141 per l'estrusione in bolla; provision of a coextrusion apparatus 100 with at least two layers, comprising a central extruder 110 and at least one extruder 120, 130, lateral to the two-layer coextrusion head 140; which includes, among other things, a cooling ring 141 for blown extrusion;
predisposizione dì due materiali A e B in granuli biodegradabili rispettivamente ottenuti da un amido A e da un acido polilattico (PLA) B; preparation of two materials A and B in biodegradable granules respectively obtained from a starch A and a polylactic acid (PLA) B;
alimentazione del rispettivo materiale A o B in granuli alle singole viti 111;121,-131 di alimentazione del relativo estrusore; feeding of the respective material A or B in granules to the single screws 111; 121, -131 for feeding the relative extruder;
fusione dei materiali A e B nel rispettivo estrusore; melting of materials A and B in the respective extruder;
alimentazione degli stessi alla testa 140 di coestrusione,-passaggio dei due componenti attraverso l'anello 141 di raffreddamento orizzontale; feeding them to the coextrusion head 140, passing of the two components through the horizontal cooling ring 141;
raffreddamento dei tre componenti; cooling of the three components;
alimentazione contemporanea di aria forzata alla testa di estrusione per la formazione di una bolla 1 i cui lati verticali lb sono, ciascuno, costituiti da una pellicola composta da due strati A e B secondo il presente trovato; simultaneous supply of forced air to the extrusion head for the formation of a bubble 1, the vertical sides 1b of which each consist of a film composed of two layers A and B according to the present invention;
raccolta attraverso due rulli 142 di calandratura dei detti lati verticali per formare un tubolare, piatto, raccolto in bobine 151 su una corrispondente bobinatrice 150. collected through two rollers 142 for calendering said vertical sides to form a flat tubular, collected in reels 151 on a corresponding winding machine 150.
Con tale composizione multistrato à ̈ possibile ottenere una pellicola caratterizzata da un'elevata resistenza a rottura, tipica della pellicola prodotta da amidi, e una trasparenza tipica della pellicola derivata da PLA, il che consente di utilizzare la pellicola secondo il trovato anche in applicazioni fino ad oggi precluse quali i coperchi per vaschette, l'imballo verticale ed orizzontale per i citati prodotti di quarta gamma. With this multilayer composition it is possible to obtain a film characterized by a high breaking strength, typical of the film produced from starches, and a transparency typical of the film derived from PLA, which allows to use the film according to the invention even in applications up to currently precluded such as lids for trays, vertical and horizontal packaging for the aforementioned fourth range products.
Utilizzando materiali A e B biodegradabili e compostabili a norma EN 13432, si ottiene un prodotto finito ancora biodegradabile e compostabile ai sensi di detta norma. By using biodegradable and compostable materials A and B according to EN 13432, a finished product is obtained that is still biodegradable and compostable according to this standard.
Risulta inoltre come il processo di formazione del pellicola sia attuabile tramite estrusori a bolla di ridotto costo ed elevato rendimento, rendendo in tal modo economicamente conveniente la realizzazione della pellicola multistrato, biodegradabile, secondo il trovato. It also appears that the film formation process can be carried out by means of low cost and high efficiency bubble extruders, thus making it economically convenient to produce the biodegradable multilayer film according to the invention.
Benché descritta in dettaglio in relazione a una configurazione preferita a tre strati B-A-B , si prevede anche che la pellicola possa essere realizzata a più strati ad esempio B-A-A-A-B e/o B-B-A-B-B e/o B-A-B-A-B tramite macchine di coestrusione a 5 strati, oppure B-B-A-A-A-B-B e/o B A-A-A-A-A-B e/o B-B-B-A-B-B-B e/o B-B-A-B-A-B-B tramite macchine di coestrusione a 7 strati. Although described in detail in relation to a preferred three-layer configuration B-A-B, it is also envisaged that the film can be made in multiple layers, for example B-A-A-A-B and / or B-B-A-B-B and / or B-A-B-A-B by means of 5-layer coextrusion machines, or B-B-A-A-A-B-B and / or B A-A-A-A-A-B and / or B-B-B-A-B-B-B and / or B-B-A-B-A-B-B through 7-layer coextrusion machines.
Si prevede inoltre che, tramite opportune apparecchiature di coestrusione appositamente predisposte, sia possibile realizzare pellicole secondo il presente trovato con qualunque altra combinazione di almeno uno strato interno A ed almeno due strati esterni contrapposti B, adatta alla specifica applicazione. It is also envisaged that, by means of suitable coextrusion apparatuses specially prepared, it is possible to produce films according to the present invention with any other combination of at least one internal layer A and at least two opposite external layers B, suitable for the specific application.
Oltre a ciò si prevede anche la predisposizione dì mezzi di taglio - schematizzati con 500 in fig. 1 -dei bordi longitudinali del tubolare 2, detti mezzi di taglio 500 sono disposti lungo il percorso dello tubolare al fine di ottenere due fogli singoli e separati che possono essere raccolti separatamente (linea a tratto) sulle due bobine 151. In addition to this, the provision of cutting means is also envisaged - schematized with 500 in fig. 1 - of the longitudinal edges of the tubular 2, said cutting means 500 are arranged along the path of the tubular in order to obtain two single and separate sheets which can be collected separately (broken line) on the two reels 151.
Benché descritta nel contesto di alcune forme di realizzazione e di alcuni esempi preferiti di attuazione dell'invenzione si intende che l'ambito di protezione del presente brevetto sia determinato solo dalle rivendicazioni che seguono. Although described in the context of some embodiments and some preferred examples of embodiment of the invention, it is intended that the scope of protection of the present patent is determined only by the following claims.
Claims (23)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI2008A001491A IT1392386B1 (en) | 2008-08-07 | 2008-08-07 | MULTILAYER FILM IN BIODEGRADABLE MATERIAL AND PROCESS FOR THE PRODUCTION OF THAT FILM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI2008A001491A IT1392386B1 (en) | 2008-08-07 | 2008-08-07 | MULTILAYER FILM IN BIODEGRADABLE MATERIAL AND PROCESS FOR THE PRODUCTION OF THAT FILM |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ITMI20081491A1 true ITMI20081491A1 (en) | 2010-02-08 |
| IT1392386B1 IT1392386B1 (en) | 2012-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ITMI2008A001491A IT1392386B1 (en) | 2008-08-07 | 2008-08-07 | MULTILAYER FILM IN BIODEGRADABLE MATERIAL AND PROCESS FOR THE PRODUCTION OF THAT FILM |
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| IT (1) | IT1392386B1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5391423A (en) * | 1992-06-26 | 1995-02-21 | The Procter & Gamble Company | Biodegradable, liquid impervious multilayer film compositions |
| WO2007118828A1 (en) * | 2006-04-14 | 2007-10-25 | Biotec Biologische Naturverpackungen Gmbh & Co. Kg | Multilayered film and method for manufacturing same |
| US20080044650A1 (en) * | 2005-01-11 | 2008-02-21 | Masayuki Sukigara | Matte Film or Sheet |
| WO2009049667A1 (en) * | 2007-10-15 | 2009-04-23 | Biotec Biologische Naturverpackungen Gmbh & Co. Kg | Multi-layer film and method for the production thereof |
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2008
- 2008-08-07 IT ITMI2008A001491A patent/IT1392386B1/en active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5391423A (en) * | 1992-06-26 | 1995-02-21 | The Procter & Gamble Company | Biodegradable, liquid impervious multilayer film compositions |
| US20080044650A1 (en) * | 2005-01-11 | 2008-02-21 | Masayuki Sukigara | Matte Film or Sheet |
| WO2007118828A1 (en) * | 2006-04-14 | 2007-10-25 | Biotec Biologische Naturverpackungen Gmbh & Co. Kg | Multilayered film and method for manufacturing same |
| WO2009049667A1 (en) * | 2007-10-15 | 2009-04-23 | Biotec Biologische Naturverpackungen Gmbh & Co. Kg | Multi-layer film and method for the production thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1392386B1 (en) | 2012-03-02 |
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