IT201800002977A1 - Stratified paper material with high mechanical resistance and relative production method - Google Patents
Stratified paper material with high mechanical resistance and relative production method Download PDFInfo
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- IT201800002977A1 IT201800002977A1 IT102018000002977A IT201800002977A IT201800002977A1 IT 201800002977 A1 IT201800002977 A1 IT 201800002977A1 IT 102018000002977 A IT102018000002977 A IT 102018000002977A IT 201800002977 A IT201800002977 A IT 201800002977A IT 201800002977 A1 IT201800002977 A1 IT 201800002977A1
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- paper material
- high mechanical
- mechanical strength
- threads
- stratified
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- 239000000463 material Substances 0.000 title claims description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000000123 paper Substances 0.000 claims description 50
- 239000000126 substance Substances 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 19
- 239000003292 glue Substances 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 12
- 239000011256 inorganic filler Substances 0.000 claims description 10
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 10
- 229920000642 polymer Polymers 0.000 claims description 10
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000013067 intermediate product Substances 0.000 claims description 8
- 239000012209 synthetic fiber Substances 0.000 claims description 8
- 229920002994 synthetic fiber Polymers 0.000 claims description 8
- 229920003043 Cellulose fiber Polymers 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 7
- 229920002472 Starch Polymers 0.000 claims description 5
- 239000002174 Styrene-butadiene Substances 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 5
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- 239000011115 styrene butadiene Substances 0.000 claims description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 5
- YIXSKDRXJTZCHT-UHFFFAOYSA-N 2-acetylbutanedioic acid Chemical compound CC(=O)C(C(O)=O)CC(O)=O YIXSKDRXJTZCHT-UHFFFAOYSA-N 0.000 claims description 4
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 4
- 229920000881 Modified starch Polymers 0.000 claims description 4
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 4
- -1 alkyl ketene dimer Chemical compound 0.000 claims description 4
- 235000012211 aluminium silicate Nutrition 0.000 claims description 4
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 4
- 238000009499 grossing Methods 0.000 claims description 4
- 235000019426 modified starch Nutrition 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 4
- 239000000454 talc Substances 0.000 claims description 4
- 229910052623 talc Inorganic materials 0.000 claims description 4
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000012764 mineral filler Substances 0.000 claims description 3
- 229920001353 Dextrin Polymers 0.000 claims description 2
- 239000004375 Dextrin Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 235000019425 dextrin Nutrition 0.000 claims description 2
- 239000000049 pigment Substances 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 2
- 229920002554 vinyl polymer Polymers 0.000 claims description 2
- 241001311547 Patina Species 0.000 claims 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000003892 spreading Methods 0.000 claims 1
- 239000001993 wax Substances 0.000 claims 1
- 239000003208 petroleum Substances 0.000 description 3
- 241000209149 Zea Species 0.000 description 2
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 2
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 2
- 239000011111 cardboard Substances 0.000 description 2
- 235000005822 corn Nutrition 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 229920001222 biopolymer Polymers 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
Classifications
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- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- B32B29/00—Layered products comprising a layer of paper or cardboard
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- B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
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- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/02—Layered products comprising a layer of paper or cardboard next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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- B32B2255/00—Coating on the layer surface
- B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
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- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
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- B32B2264/10—Inorganic particles
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- B32B2264/12—Mixture of at least two particles made of different materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B32B2307/716—Degradable
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/00—Properties of the layers or laminate
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- B32B2439/00—Containers; Receptacles
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- B32B2439/06—Bags, sacks, sachets
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2553/00—Packaging equipment or accessories not otherwise provided for
Landscapes
- Paper (AREA)
- Glass Compositions (AREA)
Description
Descrizione di una domanda di brevetto per invenzione industriale Description of a patent application for an industrial invention
DESCRIZIONE DESCRIPTION
La presente invenzione si riferisce ad un materiale cartaceo stratificato ad elevata resistenza meccanica. The present invention refers to a stratified paper material with high mechanical resistance.
Nel settore cartario è costante la ricerca di nuovi tipi di carte e cartoncini aventi caratteristiche meccaniche particolari, soprattutto destinate all’imballaggio, al confezionamento, alla stampa di qualità, eccetera. In the paper industry, there is a constant search for new types of paper and cardboard with particular mechanical characteristics, especially for packaging, wrapping, quality printing, etc.
Non di rado, però, le proprietà meccaniche derivanti dall’utilizzo della carta per la produzione dei sacchetti risultano inferiori alle medesime ottenute da polimeri derivati dal petrolio, ottenendo quindi un prodotto finito qualitativamente inferiore. Not infrequently, however, the mechanical properties deriving from the use of paper for the production of bags are inferior to the same obtained from polymers derived from petroleum, thus obtaining a lower quality finished product.
Uno scopo della presente invenzione è quello di fornire un materiale cartaceo alternativo ai suddetti polimeri derivati dal petrolio o ai biopolimeri derivati per esempio dal mais mantenendo o superando le proprietà meccaniche di questi ultimi. An object of the present invention is to provide an alternative paper material to the aforementioned petroleum-derived polymers or to biopolymers derived for example from corn while maintaining or overcoming the mechanical properties of the latter.
Altro scopo della presente invenzione è altresì quello di fornire un metodo altamente produttivo per la fabbricazione di un materiale cartaceo ad elevata resistenza meccanica. Another object of the present invention is also that of providing a highly productive method for the manufacture of a paper material with high mechanical strength.
Altro scopo ancora della presente invenzione è infine quello di fornire un sacchetto riciclabile e/o compostabile ad elevata resistenza meccanica. Finally, another object of the present invention is to provide a recyclable and / or compostable bag with high mechanical resistance.
Il compito tecnico dell’invenzione è risolto provvedendo un materiale cartaceo stratificato ad elevata resistenza meccanica caratterizzato dal fatto di comprendere un supporto stratiforme di base in nastri intrecciati e/o in fili intrecciati accoppiato ad almeno un foglio di carta, detti nastri e/o fili intrecciati di supporto di base comprendendo una miscela di fibre di cellulosa e/o fibre sintetiche riciclabili e/o compostabili come per esempio le fibre in pva, almeno una sostanza polimerica, atta a conferire alla miscela di fibre resistenza meccanica, e almeno una carica inorganica, detto supporto di base presentando almeno una superficie trattata con almeno un collante conferente resistenza alla penetrazione di acqua e/o di sostanze grasse. The technical task of the invention is solved by providing a stratified paper material with high mechanical resistance characterized by the fact of comprising a basic stratiform support in intertwined tapes and / or in interwoven threads coupled to at least one sheet of paper, said tapes and / or threads. basic support braids comprising a mixture of cellulose fibers and / or recyclable and / or compostable synthetic fibers such as pva fibers, at least one polymeric substance, capable of giving the fiber mixture mechanical strength, and at least one inorganic filler , said base support having at least one surface treated with at least one glue which gives resistance to the penetration of water and / or fatty substances.
Il materiale cartaceo, che può essere carta o cartoncino, grazie all’accoppiamento del supporto di base in nastri denominati “piattina” e/o fili intrecciati con uno o più fogli di carta, è vantaggiosamente utilizzabile per la realizzazione di un sacchetto riciclabile e/o compostabile avente una resistenza meccanica alla trazione e alla lacerazione uguale o superiore ad un sacchetto formato da polimeri derivati dal petrolio o da bio polimeri derivati per esempio dal mais. The paper material, which can be paper or cardboard, thanks to the coupling of the base support in ribbons called "flat" and / or threads intertwined with one or more sheets of paper, can be advantageously used for the realization of a recyclable bag and / or compostable having a mechanical resistance to traction and tearing equal to or greater than a bag made of polymers derived from petroleum or from bio-polymers derived for example from corn.
Il materiale cartaceo dell’invenzione risulta inoltre perfettamente stampabile con elevata qualità di stampa. The paper material of the invention is also perfectly printable with high print quality.
La presente invenzione rivela altresì un metodo di fabbricazione di un materiale cartaceo stratificato ad elevata resistenza meccanica, comprendente le fasi di: The present invention also discloses a method of manufacturing a laminated paper material with high mechanical strength, comprising the steps of:
(a) predisporre un impasto acquoso comprendente fibre di cellulosa e/o fibre sintetiche riciclabili e/o compostabili, almeno una sostanza polimerica, atta a conferire alla miscela di fibre resistenza meccanica, e almeno una carica inorganica; (a) preparing an aqueous slurry comprising cellulose fibers and / or recyclable and / or compostable synthetic fibers, at least one polymeric substance, capable of giving the fiber mixture mechanical strength, and at least one inorganic filler;
(b) formare un prodotto intermedio stratiforme rimuovendo acqua dall’impasto; (b) form a stratiform intermediate product by removing water from the mixture;
(c) trattare almeno una superficie del prodotto intermedio con almeno un collante conferente resistenza alla penetrazione di acqua e/o di sostanze grasse; (c) treating at least one surface of the intermediate product with at least one adhesive which gives resistance to the penetration of water and / or fatty substances;
(d) tagliare il prodotto intermedio in strisce, torcere dette strisce a formare nastri e/o fili e intrecciare detti nastri e/o fili a formare un supporto di base; e (d) cutting the intermediate product into strips, twisting said strips to form ribbons and / or threads and intertwining said ribbons and / or threads to form a base support; And
(e) accoppiare detto supporto di base con almeno un foglio di carta. (e) coupling said base support with at least one sheet of paper.
Altre caratteristiche dell’invenzione sono descritte nelle rivendicazioni di seguito riportate. Other features of the invention are described in the following claims.
L’invenzione sarà meglio compresa alla lettura della descrizione che segue di sue forme di realizzazione preferite. The invention will be better understood by reading the following description of its preferred embodiments.
Il materiale cartaceo stratificato ad elevata resistenza meccanica comprende dunque un supporto stratiforme di base in nastri e/o fili intrecciati accoppiato ad uno o più fogli di carta bianca o colorata. Preferibilmente il supporto stratiforme di base è in nastri intrecciati o in fili intrecciati. The stratified paper material with high mechanical resistance therefore comprises a basic stratiform support made of intertwined ribbons and / or threads coupled to one or more sheets of white or colored paper. Preferably, the basic layered support is made of intertwined ribbons or intertwined threads.
In alternativa il supporto di base può essere in parte in fili intrecciati e in parte in nastri intrecciati secondo una determinata proporzione. Di seguito faremo riferimento per semplicità al caso in cui vi sia un solo foglio di carta, ma è chiaro che i fogli di carta presenti possono essere due o più di due. Alternatively, the base support can be partly made of intertwined threads and partly of intertwined ribbons according to a determined proportion. Below we will refer for simplicity to the case in which there is only one sheet of paper, but it is clear that the sheets of paper present can be two or more than two.
I nastri intrecciati, denominati “piattina”, e/o i fili intrecciati che formano il supporto di base sono composti da una miscela di fibre di cellulosa e/o fibre sintetiche riciclabili e/o compostabili come per esempio le fibre in alcol polivinilico, almeno una sostanza polimerica, atta a conferire alla miscela di fibre resistenza meccanica, e almeno una carica inorganica. The intertwined tapes, called "flat", and / or the intertwined threads that form the base support are composed of a mixture of cellulose fibers and / or recyclable and / or compostable synthetic fibers such as polyvinyl alcohol fibers, at least one polymeric substance, suitable to give the mixture of fibers mechanical strength, and at least one inorganic filler.
La sostanza polimerica inclusa nel supporto di base comprende una o più resine a base di colofonia e/o di alchil chetene dimero e/o di acido acetil succinico e/o di epocloridrina, e/o amidi modificati. The polymeric substance included in the base carrier comprises one or more resins based on rosin and / or alkyl ketene dimer and / or acetyl succinic acid and / or epochlorhydrin, and / or modified starches.
La carica inorganica è una carica minerale e comprende una o più sostanze scelte nel gruppo costituito da carbonati, caolini, talco, loro miscele. The inorganic filler is a mineral filler and includes one or more substances selected from the group consisting of carbonates, kaolins, talc, their mixtures.
Di seguito faremo riferimento per semplicità al caso in cui vi sia una sola sostanza polimerica ed una sola carica organica nei nastri intrecciati e/o fili intrecciati che formano il supporto di base, ma è chiaro che come sopra precisato le sostanze polimeriche e le cariche organiche presenti possono essere due o più di due. Below we will refer for simplicity to the case in which there is only one polymeric substance and only one organic charge in the intertwined tapes and / or intertwined threads that form the base support, but it is clear that as specified above, the polymeric substances and organic fillers present may be two or more than two.
Il supporto di base presenta inoltre almeno una superficie trattata con almeno un collante conferente resistenza alla penetrazione di acqua e/o di sostanze grasse. The base support also has at least one surface treated with at least one glue which gives resistance to the penetration of water and / or fatty substances.
Il collante è a base di amido e/o alcol polivinilico e/o polimeri acrilici, poliuretanici e/o stirolo-butadienici. The glue is based on starch and / or polyvinyl alcohol and / or acrylic, polyurethane and / or styrene-butadiene polymers.
I nastri intrecciati denominati “piattina” e/o i fili intrecciati del supporto di base preferibilmente sono schiacciati così da formare una struttura a rete robusta a spessore ridotto. The intertwined ribbons called "flat" and / or the intertwined threads of the base support are preferably squeezed so as to form a sturdy net structure with reduced thickness.
Preferibilmente ma non necessariamente la struttura a rete ha una configurazione a nido d’ape. Preferably, but not necessarily, the mesh structure has a honeycomb configuration.
La base dei nastri intrecciati denominati piattina e/o dei fili intrecciati è data da un foglio di carta bianca o colorata; tale foglio di carta bianca o colorata è formato da una miscela di fibre cellulosiche e/o se necessario fibre sintetiche riciclabili e/o compostabili come per esempio le fibre in alcol polivinilico in percentuale variabile e contiene almeno una sostanza polimerica, atta a conferire alla miscela di fibre resistenza meccanica (a secco e ad umido), almeno una carica inorganica, atta a conferire al materiale buone caratteristiche di macchinabilità, e/o coloranti ad uso cartario atti a dare una superficie uniformemente colorata. The base of the intertwined ribbons called flat and / or intertwined threads is given by a sheet of white or colored paper; this white or colored paper sheet is made up of a mixture of cellulosic fibers and / or, if necessary, recyclable and / or compostable synthetic fibers such as for example polyvinyl alcohol fibers in a variable percentage and contains at least one polymeric substance, capable of giving the mixture of fibers mechanical resistance (dry and wet), at least one inorganic filler, suitable to give the material good characteristics of runnability, and / or dyes for paper use able to give a uniformly colored surface.
Preferibilmente, la sostanza polimerica inclusa nel supporto base comprende una o più resine a base di colofonia e/o di alchil chetene dimero e/o di acido acetil succinico e/o di epocloridrina, e/o amidi modificati. Preferably, the polymeric substance included in the base support comprises one or more resins based on rosin and / or alkyl ketene dimer and / or acetyl succinic acid and / or epochlorhydrin, and / or modified starches.
La carica inorganica preferibilmente è una carica minerale comprendente una o più sostanze scelte nel gruppo costituito da carbonati, caolini, talco, loro miscele. The inorganic filler is preferably a mineral filler comprising one or more substances selected from the group consisting of carbonates, kaolins, talc, their mixtures.
Il collante superficiale è per esempio un collante a base di amido e/o di alcol polivinilico e/o di polimeri acrilici, poliuretanici e/o stirolobutadienici. The surface adhesive is, for example, an adhesive based on starch and / or polyvinyl alcohol and / or acrylic, polyurethane and / or styrene-butadiene polymers.
La grammatura del materiale cartaceo è compresa tra circa 15 e circa 450 g/mq. The weight of the paper material is between about 15 and about 450 g / m2.
Il materiale cartaceo appena descritto viene realizzato, in accordo con un ulteriore aspetto della presente invenzione, con il metodo seguente. The paper material just described is made, in accordance with a further aspect of the present invention, with the following method.
Viene realizzato con la tecnica di formazione della carta sostanzialmente nota, per esempio su una macchina continua per la fabbricazione della carta. It is carried out with the substantially known paper forming technique, for example on a paper making machine.
In sostanza, si predispone un impasto acquoso con fibre di cellulosa e/o quando necessario fibre sintetiche riciclabili e/o compostabili come per esempio le fibre in alcol polivinilico in percentuale variabile tipicamente fino al 15% in peso, la sostanza polimerica (resine a base di colofonia e/o di alchil chetene dimero e/o di acido acetil succinico e/o di epocloridrina, e/o amidi modificati) in percentuale tipica di circa 1% in peso, la carica inorganica (carbonati, caolini, talco, eccetera) nella percentuale tipica del 15% in peso, e/o coloranti per uso cartario di varia natura che possono raggiungere tipicamente fino al 15% in peso del composto totale. Successivamente, si rimuove acqua dall’impasto per formare il supporto base del materiale cartaceo. Basically, an aqueous mixture is prepared with cellulose fibers and / or when necessary recyclable and / or compostable synthetic fibers such as polyvinyl alcohol fibers in a variable percentage typically up to 15% by weight, the polymeric substance (based resins rosin and / or alkyl ketene dimer and / or acetyl succinic acid and / or epochlorhydrin, and / or modified starches) in a typical percentage of about 1% by weight, the inorganic filler (carbonates, kaolins, talc, etc.) in the typical percentage of 15% by weight, and / or dyes for paper use of various kinds which can typically reach up to 15% by weight of the total compound. Subsequently, water is removed from the mixture to form the basic support of the paper material.
Segue una fase di trattamento superficiale di una o entrambe le facce del supporto base con una soluzione acquosa di collante superficiale, per esempio composto da una soluzione acquosa di amido al 10% in peso, e/o collante acrilico al 5% in peso, o collanti similari a base di alcol polivinilico e/o di polimeri acrilici, poliuretanici e/o stirolobutadienici. This is followed by a step of surface treatment of one or both faces of the base support with an aqueous solution of surface glue, for example composed of an aqueous solution of starch at 10% by weight, and / or acrylic glue at 5% by weight, or similar adhesives based on polyvinyl alcohol and / or acrylic, polyurethane and / or styrene-butadiene polymers.
Il metodo comprende poi, dopo il trattamento superficiale con collante, una fase di lisciatura della carta in cui la carta base è lisciata fino a valori di liscio Bendsten ISO 2494 inferiore a circa 50 ml/min anche se tipicamente si arriva a valori introno a 350 ml/min. Infine, il metodo può comprendere una fase di trattamento meccanico della superficie, in particolare una fase di goffratura oppure un fase di ulteriore trattamento superficiale attraverso il processo di patinatura con macchine in uso in ambito cartaio (lama d’aria, lama lisciante etc) atta a dare effetti ottici particolari come per esempio effetto metallico, effetto plastico, etc attraverso preparazioni a base d’acqua date da varie componenti spalmabili con composizione tipica di 80% in peso di pigmento e 20% in peso di leganti e coleganti sulla superfice e sottoposte a conseguente processo di asciugatura in forno ad infrarossi e/o ad aria calda a temperatura compresa tra circa 100°C e circa 180°C e con tempo di permanenza in forno compreso fra 0,5 e 4 minuti. The method then includes, after the surface treatment with glue, a paper smoothing phase in which the base paper is smoothed down to Bendsten ISO 2494 smooth values lower than about 50 ml / min even if typically values around 350 are reached. ml / min. Finally, the method can comprise a mechanical treatment step of the surface, in particular an embossing step or a step of further surface treatment through the coating process with machines used in the paper industry (air knife, smoothing knife, etc.) suitable for to give particular optical effects such as metallic effect, plastic effect, etc through water-based preparations given by various spreadable components with a typical composition of 80% by weight of pigment and 20% by weight of binders and bonding agents on the surface and subjected a consequent drying process in an infrared and / or hot air oven at a temperature between about 100 ° C and about 180 ° C and with a residence time in the oven between 0.5 and 4 minutes.
A questo punto il prodotto intermedio viene tagliato in strisce, le strisce vengono ritorte a formare nastri o fili e i nastri o i fili così ottenuti vengono intrecciati ed eventualmente schiacciati a formare il supporto di base. At this point the intermediate product is cut into strips, the strips are twisted to form ribbons or threads and the ribbons or threads thus obtained are intertwined and possibly crushed to form the base support.
La grammatura del supporto di base così ottenuto è compresa tra circa 15 e circa 450 g/mq. The weight of the base support thus obtained is between about 15 and about 450 g / m2.
Infine il supporto di base così ottenuto è accoppiato con il foglio di carta. Finally, the base support thus obtained is coupled with the sheet of paper.
Il supporto di base è accoppiato al foglio di carta con colle naturali a base di destrine o con colle viniliche mediante accoppiatrice a rotolo o a foglio. The base support is coupled to the paper sheet with natural dextrin-based glues or with vinyl glues by means of a roll or sheet laminator.
Resta poi inteso che al materiale cartaceo e al relativo metodo di fabbricazione qui descritti ed illustrati possono essere apportate modifiche e varianti che non escono dall’ambito dell’invenzione come definito nelle annesse rivendicazioni. It is then understood that the paper material and its manufacturing method described and illustrated here may be subject to modifications and variations that do not go beyond the scope of the invention as defined in the attached claims.
Claims (16)
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| CN201721736U (en) * | 2010-06-24 | 2011-01-26 | 林小明 | a paper plastic bag |
| EP2520710A1 (en) * | 2011-05-06 | 2012-11-07 | GRUPPO CORDENONS S.p.A. | Silk-effect paper material and corresponding manufacturing method |
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