CH655074A5 - SELF-SEALING TRANSPARENT FILM, FOR PACKAGING FOOD. - Google Patents
SELF-SEALING TRANSPARENT FILM, FOR PACKAGING FOOD. Download PDFInfo
- Publication number
- CH655074A5 CH655074A5 CH3775/83A CH377583A CH655074A5 CH 655074 A5 CH655074 A5 CH 655074A5 CH 3775/83 A CH3775/83 A CH 3775/83A CH 377583 A CH377583 A CH 377583A CH 655074 A5 CH655074 A5 CH 655074A5
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- layer
- vinyl acetate
- eva
- film according
- film
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- 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
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- 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
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/246—All polymers belonging to those covered by groups B32B27/32 and B32B27/30
-
- 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
- B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/582—Tearability
- B32B2307/5825—Tear resistant
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/718—Weight, e.g. weight per square meter
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/734—Dimensional stability
- B32B2307/736—Shrinkable
-
- 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
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
- B32B2323/046—LDPE, i.e. low density polyethylene
-
- 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
- B32B2331/00—Polyvinylesters
- B32B2331/04—Polymers of vinyl acetate, e.g. PVA
-
- 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
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
Landscapes
- Laminated Bodies (AREA)
- Wrappers (AREA)
Description
L'invenzione riguarda una pellicola (film) trasparente, estensibile a freddo, autosigillante, atta al confezionamento di cibi, quali carni fresche, frutta, verdure, foraggi e cibi surgelati, impiegabile sia manualmente che su macchine semiautomatiche od automatiche, adatta per supermercati e centri di preconfezionamento. The invention relates to a transparent, cold-stretch, self-sealing film (film) suitable for the packaging of foods, such as fresh meats, fruit, vegetables, fodder and frozen foods, which can be used both manually and on semi-automatic or automatic machines, suitable for supermarkets and prepackaging centers.
La pellicola è stata studiata per essere priva dell'inconveniente di poter cedere tracce di sostanze nocive ai cibi a contatto, che si manifesta nelle pellicole note di PVC, e per offrire bassi costi di produzione ed una efficace funzionalità nell'impiego. The film has been designed to be free from the drawback of being able to release traces of substances harmful to food in contact, which occurs in known PVC films, and to offer low production costs and effective functionality in use.
Sostanzialmente la pellicola è costituita da almeno due strati sovrapposti di materiale termoplastico in perfetta aderenza tra di loro differenziati, il primo dei quali — che fornisce le caratteristiche meccaniche, facendo da supporto — risulta da una miscela di Polietilene lineare a bassa densità (LL.DP) e di Etilenvinilacetato (EVA) con un contenuto di acetato di vinile intorno al 12%, mentre il secondo strato — che serve per ottenere la permeabilità ai gas ed al vapore di acqua adatta al particolare impiego, e la appiccicosità per l'autosigillatura — è costituito essenzialmente da Etilenvenilacetato (EVA) con un contenuto di acetato di vinile intorno al 30%, con aggiunta di percentuali di resina jonomerica, per modificarne le caratteristiche di permeabilità, e di materiale anticondensa. Basically the film is made up of at least two superimposed layers of thermoplastic material in perfect adherence, different from each other, the first of which - which provides the mechanical characteristics, acting as a support - results from a mixture of linear low density polyethylene (LL.DP ) and Ethylene Vinyl Acetate (EVA) with a vinyl acetate content of around 12%, while the second layer - which is used to obtain the permeability to gases and water vapor suitable for the particular use, and the stickiness for self-sealing - it essentially consists of Ethylenevenyl acetate (EVA) with a vinyl acetate content of around 30%, with the addition of percentages of jonomeric resin, to modify its permeability characteristics and anti-condensation material.
II disegno mostra una esemplificazione non limitativa dell'invenzione. The drawing shows a non-limiting example of the invention.
Fig. 1 mostra in ingrandimento una vista in sezione di un breve spezzone della pellicola secondo l'invenzione, in due strati differenziati; Fig. 1 shows an enlarged section view of a short piece of the film according to the invention, in two differentiated layers;
Fig. 2 mostra in ingrandimento una vista in sezione di un breve spezzone della pellicola secondo l'invenzione, con uno strato intermedio tra i due strati differenziati; e Fig. 2 shows an enlarged section view of a short piece of the film according to the invention, with an intermediate layer between the two differentiated layers; is
Figg. 3 e 4 mostrano rispettive viste, in prospettiva e laterale, di una confezione di carne fresca per supermercati o simili, avvolta con la pellicola secondo l'invenzione, prima della sigillatura. Figs. 3 and 4 show respective perspective and side views of a package of fresh meat for supermarkets or the like, wrapped with the film according to the invention, before sealing.
La pellicola secondo l'invenzione, indicata genericamente con 1, è costituita da almeno due strati 3 e 5 sovrapposti e tra loro uniti lungo tutta la superficie in modo che ne risulta impossibile la separazione. Lo spessore della pellicola — anche in relazione al tipo di impiego cosiddetto «a perdere», per avvolgere porzioni, anche di modesto peso, di cibi freschi, in supermercati o simili — è assai sottile, di solito entro la gamma dai 10 ai 25 M-» spessori maggiori venendo impiegati ad esempio per confezioni di peso o dimensioni notevoli o destinate ad essere maneggiate più volte, con maggior rischio di lacerazione. Come le pellicole estensibili di PVC fortemente plastificato finora The film according to the invention, generally indicated by 1, consists of at least two layers 3 and 5 superimposed and joined together along the entire surface so that separation is impossible. The thickness of the film - also in relation to the so-called "disposable" type of use, for wrapping portions, even of modest weight, of fresh food, in supermarkets or the like - is very thin, usually within the range of 10 to 25 M - »greater thicknesses being used, for example, for packages of considerable weight or dimensions or intended to be handled several times, with a greater risk of tearing. Like the highly plasticized PVC stretch films so far
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normalmente impiegate, la pellicola secondo l'invenzione può essere usata per confezionare cibi disposti su vassoietti aperti 7, come mostrato nelle figg. 3 e 4; oppure, come nel caso di pezzi di formaggi a consistenza solida, la pellicola viene usata senza vassoietto. normally used, the film according to the invention can be used to pack food arranged on open trays 7, as shown in figs. 3 and 4; or, as in the case of pieces of cheese with a solid consistency, the film is used without a tray.
In entrambi i casi la pellicola viene tesa (manualmente dall'operatore, o con adatti dispositivi su macchine automatiche o semiautomatiche) nei due sensi sulla superficie superiore del cibo da confezionare e «rimboccata» al di sotto del vassoietto, o del pezzo a consistenza solida, tirando e sovrapponendo per un discreto tratto i suoi lembi, come quelli indicati con 9, 11 e 13, che vengono poi premuti con l'ausilio di una piastra riscaldata contro il fondo 7F del vassoietto (o contro la superficie inferiore del pezzo a consistenza solida) cosicché essi aderiscono tra loro, mantenendo la pellicola in tensione e sigillando la confezione. In both cases the film is stretched (manually by the operator, or with suitable devices on automatic or semi-automatic machines) in both directions on the upper surface of the food to be packaged and "tucked" under the tray, or the piece with a solid consistency by pulling and overlapping its edges for a discreet stretch, such as those indicated by 9, 11 and 13, which are then pressed with the aid of a heated plate against the bottom 7F of the tray (or against the lower surface of the piece with a consistency solid) so that they adhere to each other, keeping the film under tension and sealing the package.
Per soddisfare le modalità di impiego così sommariamente descritte, la pellicola secondo l'invenzione presenta caratteristiche di estensibilità ed appiccicosità almeno pari a quelle del film di PVC plastificato in uso finora, senza l'inconveniente che il PVC presenta di poter cedere ai cibi confezionati tracce anche minime (valutabili come «parti per milione») di sostanze sospette di essere nocive, quali vinile monomero, plastificanti, come DOA, ecc. Caratteristicamente, secondo l'invenzione, tale estensibilità e tale appiccicosità sono ottenute realizzando i due strati 3 e 5 differenziati, al primo strato — che fa da supporto — essendo dovute le caratteristiche meccaniche della pellicola e cioè la estensibilità unita alla resistenza alla lacerazione o fessurazione, ed al secondo strato essendo dovuta l'appiccicosità per rendere la pellicola autosigillante nonché la caratteristica della giusta permeabilità ai gas ed al vapore d'acqua. In sostanza, per una buona conservazione dei cibi freschi occorre di solito che la pellicola destinata ad avvolgerli sia solo parzialmente impermeabile ai gas e vapori, mentre ai fini estetici è necessario che non risultino visibili condense all'interno della pellicola che sovrasta il materiale confezionato. To satisfy the methods of use thus briefly described, the film according to the invention has characteristics of extensibility and stickiness at least equal to those of the plasticized PVC film in use so far, without the drawback that PVC has the ability to give traces to packaged foods. even minimal (evaluable as «parts per million») of substances suspected of being harmful, such as vinyl monomer, plasticizers, such as DOA, etc. Characteristically, according to the invention, this extensibility and stickiness are obtained by making the two layers 3 and 5 differentiated, to the first layer - which acts as a support - the mechanical characteristics of the film being due, i.e. the extensibility combined with the resistance to tearing or cracking , and the second layer being due to the stickiness to make the film self-sealing as well as the characteristic of the right permeability to gases and water vapor. In essence, for a good preservation of fresh food it is usually necessary that the film destined to wrap them is only partially impermeable to gases and vapors, while for aesthetic purposes it is necessary that no condensation is visible inside the film that dominates the packaged material.
Per dar luogo alle caratteristiche accennate, i due strati differenziati sono ottenuti da miscele di materiali termoplastici, la cui composizione deve risultare da determinati componenti dosati entro una certa gamma di contenuti percentuali. Verranno ora indicati — con la relativa gamma entro cui essi possono variare — i componenti di ciascuno strato, le percentuali di impiego per un risultato tecnicamente ottimale, nonché quelle per un risultato senz'altro favorevole ai fini delle applicazioni pratiche, ma anche corrispondente ad un costo di produzione relativamente economico. To give rise to the characteristics mentioned, the two differentiated layers are obtained from mixtures of thermoplastic materials, the composition of which must result from certain components dosed within a certain range of percentage contents. We will now indicate - with the relative range within which they can vary - the components of each layer, the percentages of use for a technically optimal result, as well as those for a result that is certainly favorable for the purposes of practical applications, but also corresponding to a relatively cheap production cost.
Il primo strato della pellicola secondo l'invenzione è ottenuto da una miscela di Polietilene lineare a bassa densità (che viene comunemente indicato con la sigla L.L.D.P. corrispondente alle iniziali della sua denominazione in inglese) e di Etilenvinilacetato (che viene comunemente indicato con la sigla EVA) avente un contenuto di acetato di vinile relativamente basso, cioè intorno al 12%. Il secondo strato è invece costituito essenzialmente da Etzilenvinilacetato (sigla EVA) con un contenuto di acetato di vinile relativamente alto, cioè intorno al 30%; tale secondo strato può risultare anche dal 100% di EVA, ma per le applicazioni pratiche è preferibile miscelare con detta EVA una certa percentuale di resina jonomerica, quale SURLYN o simile, ed una certa percentuale di materiale anticondensa (in inglese «antifog»), del tipo comunemente usato in pellicola termoplastica per avvolgere alimenti. La resina jonomerica di cui è fatto uso nella miscela del secondo strato è di solito un copoli-mero di etilene con acido acrilico o metacrilico, nella cui molecola sono presenti legami jonici per la presenza di atomi di Zn e Na. La resina jonomerica conferisce alla pellicola secondo l'invenzione, in modo più o meno pronunciato, le caratteristiche de permeabilità ai gas e vapori a cui si è fatto cenno, ai fini della conservazione dei cibi freschi. The first layer of the film according to the invention is obtained from a mixture of linear low density polyethylene (which is commonly indicated with the initials LLDP corresponding to the initials of its denomination in English) and of ethylene vinyl acetate (which is commonly indicated with the initials EVA ) having a relatively low vinyl acetate content, i.e. around 12%. The second layer, on the other hand, consists essentially of Etzilenvinilacetato (abbreviation EVA) with a relatively high vinyl acetate content, that is around 30%; this second layer can also result from 100% EVA, but for practical applications it is preferable to mix with said EVA a certain percentage of jonomeric resin, such as SURLYN or similar, and a certain percentage of anti-condensation material (in English «antifog»), of the type commonly used in thermoplastic film for wrapping food. The jonomeric resin which is used in the mixture of the second layer is usually a copolymer of ethylene with acrylic or methacrylic acid, in whose molecule there are ionic bonds due to the presence of Zn and Na atoms. The jonomeric resin gives the film according to the invention, in a more or less pronounced way, the characteristics of permeability to the gases and vapors mentioned, for the purpose of preserving fresh food.
Il polietilene lineare a bassa densità della miscela del primo strato deve essere di grado (o melt index) piuttosto basso preferibilmente di grado 1. Tale polietilene lineare può essere inoltre in parte sostituito, per abbassare il costo del prodotto, con comune polietilene a bassa densità e di caratteristiche adatte alla produzione di film sottili e quindi anch'esso di basso grado (o melt index). The low density linear polyethylene of the mixture of the first layer must be of rather low grade (or melt index) preferably of grade 1. This linear polyethylene can also be partially replaced, to lower the cost of the product, with common low density polyethylene and characteristics suitable for the production of thin films and therefore also of low grade (or melt index).
Gli intervalli entro cui possono variare le percentuali dei componenti del primo strato e del secondo strato entro i quali la pellicola secondo l'invenzione presenta le proprietà della estensibilità a freddo e della autosigillatura, unitamente a quella della giusta permeabilità a gas e vapori, sono i seguenti: The intervals within which the percentages of the components of the first layer and of the second layer may vary within which the film according to the invention has the properties of cold extensibility and self-sealing, together with that of the right permeability to gases and vapors, are the following:
Primo strato: First layer:
Polietilene lineare a b.d. Linear polyethylene b.d.
di basso grado dal low grade since
20% 20%
al to the
50% 50%
Polietilene convenz. a b.d. Conventional polyethylene to b.d.
di basso grado dallo low grade from
0% 0%
al to the
40% 40%
EVA con il 12% circa EVA with about 12%
di acetato di vinile dal of vinyl acetate from
30% 30%
al to the
50% 50%
Secondo strato: Second layer:
EVA con il 30% circa EVA with about 30%
di acetato di vinile dal of vinyl acetate from
50% 50%
al to the
90% 90%
Resina jonomerica Jonomeric resin
(quale SURLYN o simile) (such as SURLYN or similar)
dallo from
0% 0%
al to the
40% 40%
Materiale «antifog» "Antifog" material
dal from
7% 7%
al to the
12% 12%
A prescindere dal costo, risultati tecnicamente eccellenti si ottengono con le seguenti percentuali: Regardless of the cost, technically excellent results are obtained with the following percentages:
Primo strato: First layer:
35 Polietilene lineare a b.d. di basso grado EVA con il 12% circa di acetato di vinile 35 Linear polyethylene b.d. low grade EVA with about 12% of vinyl acetate
Secondo strato: Second layer:
EVA con il 30% circa di acetato di vinile EVA with about 30% of vinyl acetate
40 40
Resina jonomerica (quale SURLYN o simile) Materiale «antifog» Jonomeric resin (such as SURLYN or similar) «Antifog» material
50% 50% 50% 50%
50% 40% 10% 50% 40% 10%
Dal punto di vista economico, si ottengono risultati senz'al-45 tro favorevoli — ai fini della funzionalità, nello specifico impiego del confezionamento e della conservazione dei cibi freschi, unitamente ad un costo di produzione tale da rendere competitivo il prodotto — con le seguenti percentuali: From an economic point of view, results are obtained without any other favorable - for the purposes of functionality, in the specific use of the packaging and storage of fresh food, together with a production cost that makes the product competitive - with the following percentages:
so Primo strato: so First layer:
Polietilene lineare a b.d. di basso grado Polietilene convenzionale a b.d. di basso grado EVA con il 12% circa di acetato di vinile Linear polyethylene b.d. low grade Conventional polyethylene b.d. low grade EVA with about 12% of vinyl acetate
55 Secondo strato: 55 Second layer:
EVA con il 30% circa di acetato di vinile Resina jonomerica (quale SURLYN o simile) Materiale «antifog» EVA with about 30% of vinyl acetate Jonomeric resin (such as SURLYN or similar) «Antifog» material
35% 35% 30% 35% 35% 30%
50% 40% 10% 50% 40% 10%
La pellicola secondo l'invenzione presenta ancora caratteristiche di funzionalità accettabili con il contenuto percentuale dei componenti del primo strato a cui corrisponde il più basso costo possibile, mentre, come appare evidente da quanto prece-65 de, la composizione del secondo strato viene stabilita principalmente in relazione all'uso a cui la pellicola è destinata e consente solo in parte variazioni al fine di abbassare i costi. The film according to the invention still has acceptable functional characteristics with the percentage content of the components of the first layer which corresponds to the lowest possible cost, while, as is clear from the foregoing, the composition of the second layer is mainly established in relation to the use to which the film is intended and allows only in part variations in order to lower costs.
La pellicola estensibile a freddo secondo l'invenzione può The cold stretch film according to the invention can
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essere realizzata, ad esempio, per costituire «barriera» al passaggio di gas e vapori, anche in tre strati, cioè con uno strato intermedio 15 (fig. 2) interposto tra i due strati differenziati descritti. Lo strato intermedio, avente la funzione di «barriera» può essere costituito da un film sottile di Cloruro di Polivinili-dene (sigla PVDC) oppure da un film sottile di resina poliam-midica (ad es. di Nylon). be made, for example, to constitute a "barrier" to the passage of gases and vapors, also in three layers, ie with an intermediate layer 15 (fig. 2) interposed between the two differentiated layers described. The intermediate layer, having the function of "barrier", can be constituted by a thin film of Polyvinyl Chloride (abbreviation PVDC) or by a thin film of polyamide resin (for example Nylon).
Sia nel caso in cui essa è realizzata in due strati sia nel caso in cui viene interposto uno strato intermedio, la pellicola secondo l'invenzione può venire prodotta secondo i comuni procedimenti di coestrusione per l'ottenimento di films sottili coestrusi. È tuttavia preferibile ottenere tale pellicola per coestrusione e soffiaggio utilizzando il metodo e l'attrezzatura descritti nella domanda di Brevetto italiano per Invenzione Industriale depositata in data 9.5.80 con il N° 9426 A/80 a nome PULEO Gaspare, in Italia. Both in the case in which it is made in two layers and in the case in which an intermediate layer is interposed, the film according to the invention can be produced according to the common coextrusion processes for obtaining coextruded thin films. However, it is preferable to obtain such a film by coextrusion and blow molding using the method and equipment described in the Italian Patent Application for Industrial Invention filed on 9.5.80 with No. 9426 A / 80 in the name of PULEO Gaspare, in Italy.
È comunque evidente che la pellicola secondo l'invenzione — in due strati soltanto, oppure con l'aggiunta di uno strato intermedio — può essere prodotta realizzando separatamente gli strati ed accoppiandoli successivamente tra di loro utilizzando i normali metodi e le normali attrezzature per la produzione di films accoppiati. It is however evident that the film according to the invention - in only two layers, or with the addition of an intermediate layer - can be produced by making the layers separately and subsequently coupling them together using normal methods and normal production equipment of coupled films.
s La pellicola secondo l'invenzione può anche essere resa ter-moretraibile, utilizzando procedimenti noti, per particolari tipi di impiego, sempre nel campo della conservazione di cibi o di prodotti alimentari. s The film according to the invention can also be made heat-shrinkable, using known processes, for particular types of use, always in the field of preserving food or food products.
Sono evidenti i vantaggi della pellicola secondo l'invenzio-io ne, la quale sostituisce validamente la pellicola di PVC estensibile a freddo, nell'impiego della conservazione dei cibi freschi (o surgelati) senza presentare l'inconveniente di cedere, ai cibi con cui la pellicola viene a contatto, tracce di componenti nocivi. Da rigorosi esperimenti effettuati è risultato che detta pelli-15 cola è chimicamente inerte e non dà luogo a cessione di tracce benché minime di sostanze di nessun tipo. Anche assoggettando la pellicola alla prova di cessione in olio vegetale, che è la più severa, la cessione è zero. The advantages of the film according to the invention are evident, which validly replaces the cold extensible PVC film, in the use of the preservation of fresh (or frozen) food without presenting the inconvenience of yielding, to the foods with which the film comes into contact, traces of harmful components. From rigorous experiments carried out it has been found that said leathers-15 cola is chemically inert and does not give rise to the release of traces, although minimal, of substances of any kind. Even subjecting the film to the release test in vegetable oil, which is the most severe, the transfer is zero.
v v
1 foglio disegni 1 sheet of drawings
Claims (9)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT09466/82A IT1192473B (en) | 1982-07-09 | 1982-07-09 | SELF-SEALING COLD EXTENDABLE TRANSPARENT FILM, FOR PACKAGING FOOD AND OTHER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH655074A5 true CH655074A5 (en) | 1986-03-27 |
Family
ID=11130555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH3775/83A CH655074A5 (en) | 1982-07-09 | 1983-07-08 | SELF-SEALING TRANSPARENT FILM, FOR PACKAGING FOOD. |
Country Status (7)
| Country | Link |
|---|---|
| BE (1) | BE897222A (en) |
| CH (1) | CH655074A5 (en) |
| DE (1) | DE3323629A1 (en) |
| DK (1) | DK318983A (en) |
| GB (1) | GB2123747B (en) |
| IT (1) | IT1192473B (en) |
| SE (1) | SE8303914L (en) |
Families Citing this family (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4551380A (en) * | 1984-05-10 | 1985-11-05 | W. R. Grace & Co., Cryovac Div. | Oriented heat-sealable multilayer packaging film |
| US4643943A (en) * | 1984-05-30 | 1987-02-17 | W. R. Grace & Co., Cryovac Div. | Multi-layer polyolefin shrink film |
| US4514465A (en) * | 1984-05-30 | 1985-04-30 | W. R. Grace & Co., Cryovac Div. | Storm window film comprising at least five layers |
| GB8518564D0 (en) * | 1985-07-23 | 1985-08-29 | Drg Uk Ltd | Multi-layer packaging material |
| US4740400A (en) * | 1986-03-27 | 1988-04-26 | Viskase Corporation | Tinted heat-shrinkable multilayer films comprising a vinylidene chloride-vinyl chloride copolymer |
| US4981734A (en) * | 1987-07-17 | 1991-01-01 | Fuji Photo Film Co., Ltd. | Packaging materials |
| US5141809A (en) * | 1987-11-19 | 1992-08-25 | Exxon Chemical Patents Inc. | Low comonomer content ethylene-acrylate polymers in stretch/cling films |
| US5049423A (en) * | 1987-11-19 | 1991-09-17 | Exxon Chemical Patents Inc. | Composite thermoplastic films for use in stretch/cling applications |
| US5154981A (en) * | 1987-11-19 | 1992-10-13 | Exxon Chemical Patents Inc. | Tackified ethylene-acrylate cling layers in stretch/cling films |
| US5066526A (en) * | 1987-11-19 | 1991-11-19 | Exxon Chemical Patents Inc. | Thermoplastic films for use in stretch/cling applications |
| US5147708A (en) * | 1987-11-19 | 1992-09-15 | Exxon Chemical Patents Inc. | Thermoplastic films for use in stretch/cling applications |
| US5173343A (en) * | 1987-11-19 | 1992-12-22 | Exxon Chemical Patents Inc. | Narrow molecular weight distribution ethylene-acrylate cling layer in stretch/cling films |
| NZ228332A (en) * | 1988-03-18 | 1991-06-25 | Exxon Chemical Patents Inc | Food wrap film comprising ethylene vinyl acetate, polyethylene and an elastomer |
| DE3911695A1 (en) * | 1989-04-10 | 1990-10-11 | Inventa Ag | COMPOSITIONS AND THEIR USE |
| GB8914703D0 (en) * | 1989-06-27 | 1989-08-16 | Dow Europ Sa | Bioriented film |
| US5298202A (en) * | 1989-07-28 | 1994-03-29 | W. R. Grace & Co.-Conn. | Double bubble process for making strong, thin film |
| US5219666A (en) * | 1990-03-23 | 1993-06-15 | W.R. Grace & Co.-Conn. | Oriented film of high clarity and gloss |
| US5158836A (en) * | 1991-02-21 | 1992-10-27 | W. R. Grace & Co.-Conn. | Oriented film of high clarity and gloss |
| US5272236A (en) * | 1991-10-15 | 1993-12-21 | The Dow Chemical Company | Elastic substantially linear olefin polymers |
| CA2048296C (en) * | 1990-08-13 | 2002-09-24 | Henry G. Schirmer | Blends of polypropylene and ethylene copolymer and films made from the blend |
| US5114763A (en) * | 1990-12-28 | 1992-05-19 | Exxon Chemical Patents Inc. | Tackified polyethylene layers in stretch/cling films |
| US5562958A (en) * | 1991-10-15 | 1996-10-08 | The Dow Chemical Company | Packaging and wrapping film |
| US5525695A (en) * | 1991-10-15 | 1996-06-11 | The Dow Chemical Company | Elastic linear interpolymers |
| US5518119A (en) * | 1992-05-27 | 1996-05-21 | Kohjin Co., Ltd. | Heat-seal package and method of packaging |
| US5225257A (en) * | 1992-06-04 | 1993-07-06 | Exxon Chemical Patents Inc | Fluorine treatment of stretch/cling films |
| US5792534A (en) | 1994-10-21 | 1998-08-11 | The Dow Chemical Company | Polyolefin film exhibiting heat resistivity, low hexane extractives and controlled modulus |
| EP1705219A1 (en) * | 1996-10-04 | 2006-09-27 | E.I.Du pont de nemours and company | Process for producing ethylene vinyl acetate film |
-
1982
- 1982-07-09 IT IT09466/82A patent/IT1192473B/en active
- 1982-10-27 GB GB08230894A patent/GB2123747B/en not_active Expired
-
1983
- 1983-06-30 DE DE19833323629 patent/DE3323629A1/en not_active Withdrawn
- 1983-07-05 BE BE0/211123A patent/BE897222A/en not_active IP Right Cessation
- 1983-07-08 CH CH3775/83A patent/CH655074A5/en not_active IP Right Cessation
- 1983-07-08 SE SE8303914A patent/SE8303914L/en not_active Application Discontinuation
- 1983-07-11 DK DK318983A patent/DK318983A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| SE8303914D0 (en) | 1983-07-08 |
| BE897222A (en) | 1983-11-03 |
| DK318983A (en) | 1984-01-10 |
| IT8209466A0 (en) | 1982-07-09 |
| DK318983D0 (en) | 1983-07-11 |
| GB2123747B (en) | 1986-03-26 |
| GB2123747A (en) | 1984-02-08 |
| SE8303914L (en) | 1984-01-10 |
| DE3323629A1 (en) | 1984-01-12 |
| IT1192473B (en) | 1988-04-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PL | Patent ceased |