ITTO20010647A1 - USE OF A MULTI-LAYER FILM MATERIAL TO REALIZE ENVELOPES. - Google Patents
USE OF A MULTI-LAYER FILM MATERIAL TO REALIZE ENVELOPES. Download PDFInfo
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- ITTO20010647A1 ITTO20010647A1 IT2001TO000647A ITTO20010647A ITTO20010647A1 IT TO20010647 A1 ITTO20010647 A1 IT TO20010647A1 IT 2001TO000647 A IT2001TO000647 A IT 2001TO000647A IT TO20010647 A ITTO20010647 A IT TO20010647A IT TO20010647 A1 ITTO20010647 A1 IT TO20010647A1
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- Prior art keywords
- layers
- layer
- film material
- material according
- polyethylene
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims description 33
- 239000010410 layer Substances 0.000 claims description 59
- -1 polyethylene Polymers 0.000 claims description 18
- 239000004793 Polystyrene Substances 0.000 claims description 13
- 229920002223 polystyrene Polymers 0.000 claims description 13
- 239000004698 Polyethylene Substances 0.000 claims description 10
- 229920000573 polyethylene Polymers 0.000 claims description 10
- 229920003023 plastic Polymers 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 239000004743 Polypropylene Substances 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 7
- 229920001155 polypropylene Polymers 0.000 claims description 7
- 235000013305 food Nutrition 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 4
- 229920005644 polyethylene terephthalate glycol copolymer Polymers 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- 239000012792 core layer Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 229920001903 high density polyethylene Polymers 0.000 claims description 2
- 239000004700 high-density polyethylene Substances 0.000 claims description 2
- 229920001684 low density polyethylene Polymers 0.000 claims description 2
- 239000004702 low-density polyethylene Substances 0.000 claims description 2
- 229920005601 base polymer Polymers 0.000 claims 1
- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 description 4
- 235000009508 confectionery Nutrition 0.000 description 4
- 239000000976 ink Substances 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- 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
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (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
- B32B27/36—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
- 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
-
- 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
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
-
- 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
- B32B2307/51—Elastic
-
- 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
- B32B2323/043—HDPE, i.e. high 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
- 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
- B32B2323/00—Polyalkenes
- B32B2323/10—Polypropylene
-
- 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
- B32B2325/00—Polymers of vinyl-aromatic compounds, e.g. polystyrene
-
- 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
- B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
-
- 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
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Wrappers (AREA)
- Laminated Bodies (AREA)
Description
DESCRIZIONE dell'invenzione industriale dal titolo: "Impiego di un materiale pellicolare multistrato per realizzare involucri" DESCRIPTION of the industrial invention entitled: "Use of a multilayer film material to make casings"
DESCRIZIONE DESCRIPTION
La presente invenzione si riferisce ad un impiego di un materiale pellicolare multistrato per realizzare involucri, in particolare di prodotti alimentari . The present invention relates to the use of a multilayer film material for making wraps, in particular for food products.
Come noto, alcuni prodotti alimentari, quali ad esempio caramelle, vengono confezionati in un involucro costituito da una pellicola di materiale plastico, solitamente trasparente o semitrasparente, che viene chiuso impartendo una torsione a tale pellicola . As is known, some food products, such as sweets, for example, are packaged in a wrapper consisting of a film of plastic material, usually transparent or semi-transparent, which is closed by imparting a twist to said film.
È scopo dell'invenzione realizzare confezioni per prodotti, in particolare prodotti alimentari, mediante l'impiego di un involucro pellicolare in grado di tenere bene la torsione che gli viene impartita per chiudere la confezione. It is an object of the invention to produce packages for products, in particular food products, by means of the use of a film wrapper capable of holding well the twisting imparted to it to close the package.
Un altro scopo dell'invenzione è di realizzare un involucro pellicolare multistrato in grado di essere stampato o metallizzato su almeno una delle sue superfici esterne senza compromettere le caratteristiche meccaniche sopra citate. Another object of the invention is to provide a multilayer film envelope capable of being printed or metallized on at least one of its external surfaces without compromising the mechanical characteristics mentioned above.
Questi scopi sono raggiunti in accordo con la presente invenzione, mediante l'impiego di un materiale pellicolare multistrato come rivendicato nella rivendicazione 1. Caratteristiche preferenziali dell'invenzione sono definite nelle rivendicazioni dipendenti. These objects are achieved in accordance with the present invention, by using a multilayer film material as claimed in claim 1. Preferred characteristics of the invention are defined in the dependent claims.
Le caratteristiche e i vantaggi dell'invenzione risulteranno dalla descrizione dettagliata di alcuni suoi esempi di realizzazione, fatta con riferimento ai disegni allegati, dati a titolo indicativo e non limitativo, che sono viste schematiche in sezione di quattro forme di realizzazione alternative di un materiale pellicolare multistrato secondo l'invenzione destinato ad essere impiegato come involucro per confezionare prodotti di vario genere. The characteristics and advantages of the invention will emerge from the detailed description of some of its embodiment examples, made with reference to the attached drawings, given by way of non-limiting example, which are schematic sectional views of four alternative embodiments of a multilayer film material according to the invention intended to be used as a wrapper for packaging products of various kinds.
Facendo inizialmente riferimento alla figura 1, con il numero 10 è indicato un materiale pellicolare multistrato in cui si distinguono cinque strati: uno strato centrale o di nucleo interno 11, due strati intermedi opposti 12 e 13, e due strati esterni 14, 15. Referring initially to Figure 1, the number 10 indicates a multilayer film material in which five layers are distinguished: a central or inner core layer 11, two opposite intermediate layers 12 and 13, and two outer layers 14, 15.
Lo strato interno 11 è essenzialmente a base di polietilene o polipropilene, mentre i due strati intermedi 12, 13 sono essenzialmente a base di polistirene e gli strati di rivestimento esterni 14, 15 sono essenzialmente a base di polietilene. The internal layer 11 is essentially based on polyethylene or polypropylene, while the two intermediate layers 12, 13 are essentially based on polystyrene and the external covering layers 14, 15 are essentially based on polyethylene.
Lo strato interno 11 e gli strati esterni 14, 15 a base di polietilene, possono essere realizzati come una composizione comprendente polietilene a bassa densità con polietilene ad alta densità, e preferibilmente comprendono polietilene metallocene, ad esempio il polietilene metallocene disponibile con i nomi commerciali Exxon ML 1018 o 18Pfax Basel. Per quanto riguarda lo strato interno 11, il polietilene metallocene è presente ad una concentrazione di circa il 90% in peso rispetto al peso complessivo dello strato interno. Negli strati esterni 14, 15, il polietilene metallocene è presente ad una concentrazione di circa il 90% in peso. The inner layer 11 and the outer layers 14, 15 based on polyethylene, can be made as a composition comprising low density polyethylene with high density polyethylene, and preferably comprise metallocene polyethylene, for example the metallocene polyethylene available under the trade names Exxon ML 1018 or 18Pfax Basel. As regards the inner layer 11, the metallocene polyethylene is present at a concentration of about 90% by weight with respect to the total weight of the inner layer. In the outer layers 14, 15, the metallocene polyethylene is present at a concentration of about 90% by weight.
Gli strati intermedi 12, 13 sono invece di preferenza realizzati come una composizione comprendente polistirene base miscelato con polistirene modificato quale ad esempio il copolimero di stirene-butadiene commercializzato dalla Phillips Chemical Company con il nome commerciale K-Resin®. The intermediate layers 12, 13 are instead preferably made as a composition comprising basic polystyrene mixed with modified polystyrene such as the styrene-butadiene copolymer marketed by Phillips Chemical Company under the trade name K-Resin®.
Nella forma di realizzazione alternativa rappresentata schematicamente nella figura 2, ciascuno strato intermedio comprende a sua volta due strati: In the alternative embodiment schematically represented in Figure 2, each intermediate layer in turn comprises two layers:
uno strato più interno 12a, 13a a base di polistirene, a contatto con lo strato centrale 11, e uno strato più esterno 12b, 13b a base di polistirene modificato quale ad esempio il copolimero di stirene-butadiene disponibile in commercio sotto il nome commerciale K-Resin®. an innermost layer 12a, 13a based on polystyrene, in contact with the central layer 11, and an outermost layer 12b, 13b based on modified polystyrene such as for example the styrene-butadiene copolymer commercially available under the trade name K -Resin®.
Le funzioni svolte dai vari strati sono le seguenti. The functions performed by the various layers are as follows.
Lo strato di nucleo centrale 11, oltre a svolgere una funzione di legante per i due strati intermedi 12, 13, sfrutta le proprietà elastiche del polietilene o del polipropilene per conferire alla pellicola multistrato nel suo insieme buone proprietà di flessibilità nonché di resistenza alle deformazioni locali, in particolare quelle prodotte per torsione, senza permettere la formazione di fessure o discontinuità che potrebbero consentire l'ingresso, all'interno di una confezione, di agenti contaminanti esterni quali acqua, polvere, sporcizia, ecc. The central core layer 11, in addition to performing a binder function for the two intermediate layers 12, 13, exploits the elastic properties of polyethylene or polypropylene to give the multilayer film as a whole good properties of flexibility as well as resistance to local deformations , in particular those produced by twisting, without allowing the formation of cracks or discontinuities that could allow the entry, inside a package, of external contaminants such as water, dust, dirt, etc.
Gli strati intermedi 12, 13, intimamente legati tramite lo strato centrale 11, sono invece più inclini, rispetto a questo, di subire deformazioni plastiche permanenti, in particolare quando al materiale multistrato viene impartita una torsione. The intermediate layers 12, 13, intimately bonded by means of the central layer 11, are instead more prone, with respect to the latter, to undergo permanent plastic deformations, in particular when a torsion is imparted to the multilayer material.
Gli strati esterni di rivestimento 14, 15 sono quelli che ricevono gli inchiostri di stampaggio, che vengono applicati sul materiale pellicolare multistrato per riportare immagini e/o scritte in funzione della sua destinazione finale. The external coating layers 14, 15 are those that receive the printing inks, which are applied on the multilayer film material to carry images and / or writings according to its final destination.
Le esperienze condotte dal Richiedente dimostrano che per effetto delle diverse caratteristiche elastiche e plastiche dei vari strati, la tendenza dello strato interno (più elastico) di riprendere la sua forma originale in contrasto alla torsione che viene impartita alla pellicola multistrato, è contrastata efficacemente dagli strati intermedi 12 e 13, i quali reagiscono al movimento di ritorno elastico dello strato centrale agendo con un braccio di coppia resistente "b" elevato e approssimativamente individuabile come la distanza che unisce i baricentri G12 e G13 dei due strati intermedi, misurata in direzione perpendicolare al piano di sviluppo della pellicola. The experiments carried out by the Applicant show that due to the different elastic and plastic characteristics of the various layers, the tendency of the inner (more elastic) layer to resume its original shape in contrast to the torsion that is imparted to the multilayer film, is effectively counteracted by the layers. intermediate layers 12 and 13, which react to the elastic return movement of the central layer by acting with a high resistant torque arm "b" and approximately identifiable as the distance that joins the centers of gravity G12 and G13 of the two intermediate layers, measured perpendicular to the film development plan.
Le esperienze condotte dal Richiedente hanno dimostrato che un materiale multistrato di questo tipo permette di conseguire risultati eccellenti per il confezionamento di prodotti alimentari, quali ad esempio prodotti dolciari, dove l'involucro viene avvolto attorno al prodotto, ad esempio una caramella, e quindi chiuso impartendo all'involucro una torsione. The experiences carried out by the Applicant have shown that a multilayer material of this type allows excellent results to be achieved for the packaging of food products, such as confectionery products, where the wrapping is wrapped around the product, for example a candy, and then closed. giving the casing a twist.
In assenza degli strati esterni 14, 15, se lo stampaggio fosse effettuato direttamente sugli strati 12, 13 a base di polistirene, questi ultimi verrebbero intaccati dalle sostanze con proprietà solventi (alcool, acetati) presenti nella maggior parte degli inchiostri, e pertanto il materiale pellicolare tenderebbe ad attorcigliarsi o accartocciarsi (subendo il fenomeno noto con il termine anglosassone "curling"), con conseguente perdita di caratteristiche tecniche ed estetiche del prodotto. In the absence of the external layers 14, 15, if the molding were carried out directly on the polystyrene-based layers 12, 13, the latter would be affected by the substances with solvent properties (alcohol, acetates) present in most of the inks, and therefore the material film would tend to twist or crumple (undergoing the phenomenon known with the Anglo-Saxon term "curling"), with consequent loss of technical and aesthetic characteristics of the product.
Il materiale pellicolare multistrato della presente invenzione può quindi essere stampato vantaggiosamente anche con qualsiasi inchiostro normalmente utilizzato per lo stampaggio su polipropilene, e non richiede necessariamente l'utilizzazione di inchiostri all'acqua (che non intaccano il polistirene) . The multilayer film material of the present invention can therefore be advantageously printed also with any ink normally used for printing on polypropylene, and does not necessarily require the use of water-based inks (which do not damage the polystyrene).
Secondo una ulteriore forma di attuazione della presente invenzione, come illustrato schematicamente nella figura 3, è previsto un solo strato di rivestimento esterno 14 atto ad essere stampato ed avente le caratteristiche sopra citate con riferimento agli esempi di realizzazione già descritti. According to a further embodiment of the present invention, as schematically illustrated in Figure 3, a single outer coating layer 14 is provided which is suitable for being molded and having the characteristics mentioned above with reference to the embodiments already described.
Secondo un'altra forma di attuazione della presente invenzione, come illustrato in figura 4, il singolo strato 14 o i due strati 14, 15 di rivestimento esterno/i possono essere realizzati in PET (tereftalato di polietilene) o PETG (poliestere amorfo di acido tereftalico), unito/i allo strato intermedio 12, 13 mediante un adesivo 16. According to another embodiment of the present invention, as illustrated in Figure 4, the single layer 14 or the two layers 14, 15 of the outer coating (s) can be made of PET (polyethylene terephthalate) or PETG (amorphous polyester of terephthalic acid). ), joined to the intermediate layer 12, 13 by means of an adhesive 16.
Naturalmente, il riferimento all'utilizzazione del materiale multistrato per il confezionamento di prodotti dolciari non deve essere in alcun modo interpretato come limitativo della portata del brevetto. L'invenzione potrà, in particolare, essere utilizzata per il confezionamento di prodotti alimentari in generale e/o di prodotti di altro genere che si desidera confezionare mediante un involucro pellicolare che si chiude per mantenimento della torsione che viene ad esso impartita. Naturally, the reference to the use of multilayer material for the packaging of confectionery products must in no way be interpreted as limiting the scope of the patent. The invention can, in particular, be used for the packaging of food products in general and / or of other kinds of products that it is desired to pack by means of a film wrapper which closes by maintaining the torsion imparted to it.
Ovviamente la caratteristica meccanica della pellicola multistrato è funzione del suo spessore; tuttavia, anche utilizzando pellicole aventi uno spessore complessivo di circa 20 micron si sono ottenute caratteristiche di tenacia eccellenti. Obviously the mechanical characteristic of the multilayer film is a function of its thickness; however, even using films having an overall thickness of about 20 microns excellent tenacity characteristics were obtained.
Idealmente, per gli scopi e le applicazioni sopra menzionate, lo spessore complessivo della pellicola dovrebbe essere generalmente compreso tra circa 20 e circa 50 micron. In una forma di attuazione particolarmente preferita, le percentuali di spessore dei vari strati costituenti la pellicola sono ripartite uniformemente. Tuttavia, al fine di ottenere un prodotto che complessivamente non sia troppo fragile né troppo elastico, è preferibile che gli strati intermedi, essenzialmente a base di polistirene, abbiano ciascuno uno spessore compreso tra circa il 20% e circa il 40% dello spessore totale della pellicola, mentre lo strato centrale, a base di polietilene, dovrebbe avere uno spessore compreso tra il 20% ed il 60% dello spessore totale. Ideally, for the purposes and applications mentioned above, the overall film thickness should generally be between about 20 and about 50 microns. In a particularly preferred embodiment, the percentages of thickness of the various layers constituting the film are uniformly distributed. However, in order to obtain a product that overall is neither too fragile nor too elastic, it is preferable that the intermediate layers, essentially based on polystyrene, each have a thickness between about 20% and about 40% of the total thickness of the film, while the central layer, based on polyethylene, should have a thickness between 20% and 60% of the total thickness.
Claims (11)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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IT2001TO000647A ITTO20010647A1 (en) | 2001-07-04 | 2001-07-04 | USE OF A MULTI-LAYER FILM MATERIAL TO REALIZE ENVELOPES. |
PCT/IT2002/000431 WO2003004268A1 (en) | 2001-07-04 | 2002-07-01 | Use of a multilayer film material for packaging, multilayer film material and wrapper capable of being closed by twisting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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IT2001TO000647A ITTO20010647A1 (en) | 2001-07-04 | 2001-07-04 | USE OF A MULTI-LAYER FILM MATERIAL TO REALIZE ENVELOPES. |
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ITTO20010647A1 true ITTO20010647A1 (en) | 2003-01-04 |
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IT2001TO000647A ITTO20010647A1 (en) | 2001-07-04 | 2001-07-04 | USE OF A MULTI-LAYER FILM MATERIAL TO REALIZE ENVELOPES. |
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IT (1) | ITTO20010647A1 (en) |
WO (1) | WO2003004268A1 (en) |
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EP2692536A4 (en) * | 2011-03-31 | 2014-11-05 | Dainippon Ink & Chemicals | Inkjet recording medium, printed material, method for producing same, and package |
JP2015532223A (en) * | 2012-10-05 | 2015-11-09 | ユニリーバー・ナームローゼ・ベンノートシヤープ | New laminated film for packaging |
CN106081344B (en) * | 2016-06-20 | 2017-05-31 | 广东宝佳利彩印实业有限公司 | A kind of plastic containers containing soy sauce are not swollen encapsulating closing lid film preparation method |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT405628B (en) * | 1996-11-18 | 1999-10-25 | Teich Ag | USE OF A MULTI-LAYER PACKAGING MATERIAL PRODUCED BY COEXTRUSION FOR TWIST PACKAGING |
FR2774078B1 (en) * | 1998-01-29 | 2000-03-03 | Soplaril Sa | FILM FOR THE WRAPPING OF OBJECTS |
-
2001
- 2001-07-04 IT IT2001TO000647A patent/ITTO20010647A1/en unknown
-
2002
- 2002-07-01 WO PCT/IT2002/000431 patent/WO2003004268A1/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
WO2003004268A1 (en) | 2003-01-16 |
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