BRPI0710302A2 - corpo tubular de embalagem em material termoplástico com cinta incrustada - Google Patents
corpo tubular de embalagem em material termoplástico com cinta incrustada Download PDFInfo
- Publication number
- BRPI0710302A2 BRPI0710302A2 BRPI0710302-6A BRPI0710302A BRPI0710302A2 BR PI0710302 A2 BRPI0710302 A2 BR PI0710302A2 BR PI0710302 A BRPI0710302 A BR PI0710302A BR PI0710302 A2 BRPI0710302 A2 BR PI0710302A2
- Authority
- BR
- Brazil
- Prior art keywords
- laminate
- belt
- layer
- welded
- strap
- Prior art date
Links
- 239000012815 thermoplastic material Substances 0.000 title claims 2
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000004806 packaging method and process Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract 3
- 230000008569 process Effects 0.000 claims description 26
- 238000003466 welding Methods 0.000 abstract description 18
- 229920001169 thermoplastic Polymers 0.000 abstract description 2
- 239000004416 thermosoftening plastic Substances 0.000 abstract description 2
- 230000004888 barrier function Effects 0.000 description 6
- 239000003292 glue Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
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- 230000000694 effects Effects 0.000 description 4
- 229920001903 high density polyethylene Polymers 0.000 description 4
- 239000004700 high-density polyethylene Substances 0.000 description 4
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 3
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 3
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
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- 229920002873 Polyethylenimine Polymers 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
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- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
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- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 1
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- 238000004321 preservation Methods 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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Abstract
<B>CORPO TUBULAR DE EMBALAGEM EM MATERIAL TERMOPLáSTICO COM CINTA INCRUSTADA.<D> A presente invenção refere-se a um corpo tubular de embalagem formado de um laminado constituído de pelo menos um material termoplástico, cujas extremidades são fixadas por soldagem e recobertas por uma cinta soldada e colada, O corpo tubular, de acordo com a invenção, é caracterizado pelo fato dessa cinta ser pelo menos parcialmente incrustada no laminado. A invenção se refere também aos processos de fabricação desse corpo tubular.
Description
Relatório Descritivo da Patente de Invenção para "CORPO TU-BULAR DE EMBALAGEM EM MATERIAL TERMOPLÁSTICO COM CINTAINCRUSTADA".
Domínio da Invenção
A presente invenção refere-se ao domínio dos tubos flexíveisformados por meio de películas plásticas. Ela se refere mais precisamente aum tubo flexível cujas extremidades são soldadas ponta a ponta.Estado da técnica
Numerosos tubos flexíveis são confeccionados por soldagemdas extremidades de um laminado, contendo pelo menos uma camada deplástico.
O método de soldagem o mais comum consiste em formar umrecobrimento das extremidades do laminado e em ligar a face interna sobrea face superior do laminado. Essa ligação apresenta numerosas vantagens,pois permite notadamente conseguir uma resistência elevada da zona sol-dada, garantir as propriedades de higiene face ao produto embalado e asse-gurar boas propriedades de barreira e de estanqueidade. Todavia, essa liga-ção pode se mostrar insuficiente para o acondicionamento de produtos a-gressivos que migram na zona soldada e levam à deslaminação do Iamina-do. Essa embalagem apresenta também o inconveniente de apresentar umasuperespessura considerável no nível da zona soldada, o que prejudica aspropriedades estéticas da embalagem.
O pedido de patente EP 0187541 (figura 1) propõe a utilizaçãode uma cinta soldada no interior do tubo para proteger a zona soldada damigração de produtos agressivos. A figura ilustra uma ligação 1 para emba-lar produtos contendo ciano acrilatos. De acordo com o modo preferencial dainvenção, o laminado comporta uma primeira camada 5 de polietileno altadensidade (PEHD) em contato com o produto embalado, uma camada dealumínio 4 e uma segunda camada 3 de (PEHD) na superfície externa. Olaminado 2 compreende também uma camada de polietileno imina (PEI) euma camada de etileno ácido acrílico copolímero (EAA) entre as camadas 5e 4, assim como uma camada de (EAA) entre as camadas 4 e 3, a fim de ga-rantir uma boa adesão entre as camadas 3, 4 e 5. As extremidades do lami-nado 2 formam um recobrimento na zona soldada 6. A cinta 7 em PEHD ésoldada sobre a face interna da ligação 1 e se acha no interior do tubo. Acinta 7 permite diminuir a difusão dos ciano acrilatos na zona soldada e evitaos problemas de deslaminação.
A patente US 4733800 (figura 2) divulga a utilização de uma cin-ta soldada no interior de um tubo plástico, a fim de suprimir o efeito de retor-no elástico da embalagem, quando é comprimido para extrair o produto. Es-se retorno elástico, denominado também "dead fold' pelo técnico faz entrar o ar na embalagem e à medida que esta se esvazia, o que resulta em umaoxidação acelerada do produto embalado. Para prevenir esse inconveniente,a patente US 4733800 propõe a utilização de uma cinta soldada no interiordo tubo e compreendendo uma camada metálica. O tubo é formado pelaligação 1 de um laminado 2 soldado ponta a ponta. Esse laminado 2 com- porta pelo menos uma camada metálica 4 de espessura compreendida entre5 e 40 mícrons e uma camada 5 soldante. A cinta 7 soldada sobre a faceinterna da ligação 1 se sobrepõe às extremidades do laminado 2 no nível dazona de soldagem ponta a ponta 6. A cinta 7 situada no interior do tubocomporta pelo menos uma camada metálica de espessura compreendida entre 40 e 200 mícrons, assim como duas camadas soldantes 8 e 10. Essacinta 7 permite evitar o retorno elástico do tubo, quando da extração do pro-duto e reforça a zona soldada, devido à espessura da camada metálica 9.Todavia, a invenção descrita na patente US 4733800 apresenta vários in-convenientes maiores. Um primeiro inconveniente reside no fato da camada metálica 9 se achar em contato direto com o produto embalado, o que criaproblemas, quando o produto é alimentício. Um segundo inconveniente éligado à espessura importante da cinta que torna difícil até mesmo impossí-vel a ligação da cabeça do tubo sobre o corpo tubular.
O pedido de patente JP06166107 (figura 3) propõe a utilização de uma cinta soldada no interior do tubo, a fim de prevenir os inconvenientesda soldagem por recobrimento das extremidades do laminado. O pedido depatente JP 06166107 propõe notadamente evitar o contato das camadasbarreiras com o produto embalado, posicionando as extremidades do lami-nado ponta a ponta e soldando uma cinta que liga essas extremidades. Umtubo é formado da ligação 1 de um laminado 2, cujas extremidades são po-sicionadas ponta a ponta. As extremidades 6 não são soldadas entre si; elassão ligadas por intermédio da cinta 7 soldada sobre a face inferior do lami-nado. De acordo com o pedido de patente JP 06166107, a cinta pode com-portar várias camadas e a camada soldada é de natureza idêntica à camadainferior 5 do laminado. A invenção descrita no pedido de patente JP06166107 é interessante para associar laminados não soldantes ponta aponta. Todavia, ela apresenta vários inconvenientes. Um primeiro inconveni-ente é de ordem estética, pois a superfície externa do tubo comporta umaruptura de sua superfície externa no nível da ligação ponta a ponta 6. Umsegundo inconveniente é ligado à superespessura criada pela cinta internaque torna difícil a ligação da cabeça de tubo sobre o corpo tubular.
roblema a Resolver
O acréscimo de uma cinta que liga as extremidades de um lami-nado soldado ponta a ponta para formar corpos tubulares apresenta nume-rosas vantagens. Todavia, os tubos formados a partir desses corpos tubula-res apresentam vários inconvenientes.
Quando a cinta é soldada ou colada sobre a superfície externado laminado, podem aparecer defeitos, quando da impressão do corpo tubu-lar, esses defeitos de decoração sendo ligados à superespessura criada pelacinta. Um outro inconveniente do acréscimo de uma cinta sobre a superfícieexterna da embalagem é ligado ao fato do consumidor poder sentir a super-espessura de cinta, quando do ato de segurar na mão a embalagem. A sen-sação criada é particularmente prejudicial à utilização desses tubos sobre omercado dos produtos cosméticos.
Quando a cinta é acrescentada sobre a superfície interna docorpo tubular, acontece que a soldagem da~cabeça de tubo sobre o corpotubular apresenta dificuldades. Foi observado que com efeito a superespes-sura criada pela cinta gera um risco de escapamento da embalagem no nívelda cabeça soldada.Definição dos termos utilizados no exposto da invenção
No exposto da invenção os termos e abreviações seguintes são
utilizados:
Laminado: película multicamada resultante da complexagem devárias películas;
BOPET: polietileno tereftalato biorientadoBOPP: polipropileno biorientadoΒΟΡΑ: poliamida biorientadoPE: polietilenoLDPE: polietileno baixa densidadeLLDPE: polietileno baixa densidade linearHDPE: polietileno alta densidadeEVOH: etileno álcool vinílico
Adesivo: cola utilizada quando da confecção dos laminados paraassociar várias películas
Cola: produto adesivo servindo para colar a cinta sobre o lami-nado
Soldagem: a operação de soldagem chega a ligar, fazendo-sefundir dois materiais de mesma natureza ou miscíveis no estado fundido,essa miscibilidade manifestando-se pela difusão e pela interpenetração dascadeias moleculares; depois fazendo-se resfriar esses materiais, a fim desolidificar o estado de interpenetração molecular.
Colagem: por oposição à soldagem, a colagem é definida comouma operação de ligação de dois materiais não sendo de mesma naturezaou imiscível no estado fundido. A colagem pode fazer intervir mecanismosquímicos (reação das extremidades de cadeia, reticulação), mecanismosfísicos (forças de Van des Waals, evaporação). A colagem é uma operaçãode ligação que pode ser realizada à temperatura ambiente ou aquecendo osmateriais.
Exposto Geral da Invenção
A invenção consiste em incrustar pelo menos parcialmente acinta soldada no laminado, a fim de que a espessura emergente da cintasoldada seja inferior à espessura dessa cinta.
No presente texto, conforme será visto na seqüência, o termo"incrustar" significa indiferentemente "inserir em uma superfície alargada" ou"introduzir em uma superfície inicialmente desprovida de cavidade".
De acordo com um modo de realização da invenção, a cinta éincrustada no laminado e as superfícies respectivas do laminado e da cintasão tangentes.
O primeiro processo de incrustação consiste em exercer umapressão sobre essa cinta, a fim de fazê-la penetrar na espessura do Iamina-do, quando este se acha em um estado pelo menos parcialmente fundido.
Um segundo processo consiste em incrustar a cinta em um la-minado no estado sólido e compreende pelo menos uma operação de colo-cação da cinta em pressão.
Um terceiro processo de incrustação da cinta é baseado sobreuma deformação do laminado previamente à aplicação da cinta. Esse pro-cesso compreende uma etapa de deformação a quente ou a frio do lamina-do, a fim de criar o local da cinta.
Um quarto processo de incrustação consiste em criar o local dacinta por retirada de matéria. A espessura do laminado é reduzida Iocalmen-te no nível das extremidades, a fim de criar o local da cinta.
A fim de facilitar a inserção da cinta, as bordas dessa cinta po-dem ser facetadas.
Quando a cinta é incrustada sobre a superfície externa da emba-lagem, a estética da embalagem não é degradada.
Quando a cinta é incrustada sobre a superfície interna da emba-lagem,a soldagem do componente sobre o corpo tubular continua de grandequalidade.
A invenção será melhor compreendida com o auxílio da descri-ção de modos de execução destas e das figuras seguintes, nas quais:as figuras 1 a 3 descrevem as principais utilizações de uma cintade soldagem conhecidas na técnica anterior para ligar as extremidades sol-dadas de um laminado;a figura 1 ilustra a utilização de uma cinta para limitar a migraçãode componentes agressivos contidos na embalagem;
a figura 2 ilustra a utilização de uma cinta para o efeito de retor-no elástico do tubo, quando é comprimido para extrair o produto;
a figura 3 ilustra a utilização de uma cinta soldada no interior dotubo, a fim de prevenir os inconvenientes da soldagem por recobrimento dasextremidades do laminado;
as figuras 4 a 6 ilustram vários modos de realização da inven-ção.
A figura 4 apresenta um primeiro exemplo de realização da in-venção que consiste em incrustar pelo menos parcialmente a cinta na cama-da que forma a superfície da embalagem.
A figura 5 apresenta um outro exemplo de realização da inven-ção que consiste em incrustar pelo menos parcialmente a cinta na espessurado laminado.
A figura 6 ilustra um terceiro exemplo de realização da invençãoque consiste em incrustar e deformar a cinta.Exposto Detalhado da Invenção
A invenção consiste em um novo processo de confecção de tubopor soldagem ponta a ponta das extremidades de um laminado; o processoconsistindo em acrescentar uma cinta ligando as extremidades do laminadoe em incrustar pelo menos parcialmente essa cinta na superfície do lamina-do, a fim de suprimir os efeítos negativos de ordem estética ou técnica liga-dos à presença dessa cinta; e a fim de melhorar a resistência da ligação.
A figura 4 ilustra um primeiro exemplo de realização da inven-ção. Um corpo tubular 1 é formado por soldagem ponta a ponta das extremi-dades de um laminado 2. Uma cinta 7 liga as extremidades do laminado ereforça a zona soldada 6. A invenção se caracteriza pelo fato da cinta 7 serincrustada na camada 3 que forma a superfície superior do laminado. Depreferência, a espessura emergente da cinta é inferior à sua semi-espessura. Idealmente, essa cinta é totalmente incrustada no laminado, afim da superfície de ligação formar uma superfície lisa e contínua.O laminado ilustrado na figura 4 comporta uma camada 3 queforma a superfície superior do laminado; uma segunda camada 5 formando asuperfície inferior do laminado e uma camada 4 presa entre as camadas 3 e5; essas camadas 3, 4 e 5 podendo ser de natureza diferente; e essas ca- madas 3, 4 e 5 sendo ligadas entre si no nível de sua interface. O laminado2 comporta geralmente uma ou várias camadas não soldantes ponta a pon-ta. A camada 4 que forma uma fina camada com propriedades barreira não égeralmente soldada no nível de suas extremidades. A camada 4 é, por e-xemplo, uma folha de alumínio ou uma camada de EVOH (etileno álcool vini- Ia). Na figura 4, a camada 5 que forma a superfície interna do tubo é soldadano nível de suas extremidades, a fim de garantir uma preservação correta doproduto embalado e evitar que o produto embalado possa se achar em con-tato com as extremidades não soldadas desse laminado 2. Uma camada 5em poliolefina é vantajosa. A cinta 7 é tornada solidária à camada superior 3 por soldagem ou colagem. Quando a cinta 7 é soldada, a cinta 7 comportapelo menos uma camada de mesma natureza que a camada superior 3 dolaminado. Quando a cinta 7 é soldada, a camada 3 é vantajosamente com-posta de poliolefina (PE ou PP).
A cinta 7 ilustrada na figura 4 é preferencialmente de espessura estreita, a fim de facilitar sua incrustação na camada 3 do laminado; essaespessura sendo habitualmente inferior à semi-espessura do laminado, a fimde evitar uma superespessura considerável no nível da zona soldada 6. Acinta 7 compreende vantajosamente várias camadas das quais uma camadade grande resistência e de espessura fina. Essa camada de grande resistên- cia é, por exemplo, em polímero biorientado. A cinta pode também conteruma camada de efeito barreira de espessura fina. A cinta 7 comporta tam-bém uma camada de ligação com a camada 3 do laminado; essa camada deligação sendo de mesma natureza que a camada 3, quando a cinta é solda-da; essa camada sendo uma cola, quando a cinta é colada sobre essa ca-mada 3. Com uma cinta comportando várias camadas, a espessura da cintapode ser reduzida e sua incrustação na espessura do laminado facilitada. Acinta 7 permite reforçar a resistência da zona soldada 6 e previne o fato dasoldadura ponta a ponta das extremidades do laminado apresentar uma re-sistência menor do que aquela do laminado. No mínimo, a cinta compensa ofato de certas camadas do laminado não serem soldadas.
A figura 4 ilustra a incrustação de uma cinta 7 sobre a superfíciesuperior de um laminado 2 que forma a superfície externa de um corpo tubu-lar 1. De acordo com um outro modo de realização da invenção, a cinta 7 éincrustada na camada inferior 5 do laminado que forma a camada interna daembalagem. De acordo com esse modo de realização, a cinta 7 comportapelo menos uma camada que se solda sobre a camada 5 do laminado. Depreferência, a cinta 7 comporta uma camada de mesma natureza que a ca-mada 5 do laminado; habitualmente, essa camada 5 é uma camada de polio-lefina. A cinta 7 comporta preferencialmente uma fina camada de polímerobiorientada presa entre duas camadas soldantes; uma primeira camadapermitindo soldar a cinta 7 na camada 5, e uma segunda camada permitindosoldar a cinta 7 sobre a cabeça de tubo que é ligada à camada interna 5 docorpo tubular 1.
Um outro modo de realização da invenção consiste em incrustarsomente as bordas dessa cinta 7; essa cinta 7 podendo ser incrustada sobrea camada superior 3 ou a camada inferior 5 do laminado 2.
A figura 5 ilustra um outro exemplo de incrustação de uma cintaem um laminado que compreende pelo menos duas camadas; uma primeiracamada superior 3 que forma a superfície superior do laminado e uma se-gunda camada 5 que forma a superfície inferior do laminado e a superfícieinterna da embalagem. A cinta 7 é fixada sobre a camada 3 que forma a ca-mada superior da embalagem e incrustada na espessura do laminado; a in-crustação da cinta 7 na espessura da camada 3 não sendo possível devido àespessura ou às propriedades dessa camada 3. A figura 5 ilustra uma cola-gem da cinta 7 sobre a camada 3. Uma colagem da cinta 7 é particularmentevantajosa, quando a camada superior 3 é uma camada de polímero biorien-tada (BOPET ou BOPP), ou quando a camada superior 3 é impressa sobresua superfície externa. Uma cinta que comporta uma camada de polímerobiorientada e uma camada de cola é particularmente vantajosa, devido à suaespessura muito estreita e à sua grande transparência. A figura 5 ilustra ofato da cinta ser fixada sobre a camada 3 e incrustada no laminado por de-formação da camada inferior 5.
A figura 6 ilustra um terceiro exemplo de incrustação de umacinta na espessura de um laminado. Um corpo tubular 1 é formado de umlaminado 2, cujas extremidades são soldadas ponta a ponta. O laminadocomporta uma camada 3 que forma a superfície superior do laminado; umacamada 4 que forma a superfície inferior do laminado e a superfície internada embalagem; e uma camada 4 presa entre as camadas 3 e 5. Geralmente,a camada 4 do laminado não é soldada ponta a ponta devido à sua espessu-ra estreita ou às suas propriedades. Uma cinta 7 é fixada sobre a camada 3do laminado e reforça a zona soldada 6. A cinta 7 ilustrada na figura 6 com-porta pelo menos duas camadas; uma primeira camada 9 de grande resis-tência e de fina espessura; e uma segunda camada 8 que se solda sobre acamada 3 do laminado. Preferencialmente, as camadas 8 e 3 são de mesmanatureza. A cinta 7 é soldada e incrustada na camada 3 do laminado. A cinta7 se deformou por escoamento da camada 8, quando da incrustação dessazona na espessura do laminado.
Vários processos de incrustação da cinta na espessura do Iami-nado podem ser considerados.
Um primeiro processo de incrustação da cinta consiste em intro-duzir a cinta no laminado pelo menos parcialmente fundido e compreendepelo menos uma operação de colocação da cinta em pressão. A incrustaçãoda cinta pode ser feita conjunta ou sucessivamente à soldagem ponta a pon-ta do laminado, conjunta ou sucessivamente à soldagem ou colagem da cin-ta sobre o laminado.
Um segundo processo de incrustação da cinta consiste em in-troduzir a cinta em um laminado no estado sólido e compreende pelo menosuma operação de colocação da cinta em pressão. A incrustação da cinta éfeita sucessivamente à soldagem ponta a ponta do laminado, e conjunta ousucessivamente à soldagem ou colagem da cinta sobre o laminado.
Um terceiro processo de incrustação da cinta é baseado sobreuma deformação do laminado previamente à aplicação da cinta. Esse pro-cesso compreende uma etapa de deformação a quente ou a frio do lamina-do, a fim de criar o local da cinta. A deformação do laminado é feita prefe-rencialmente em toda a extensão, antes da ligação ponta a ponta das extre-midades do laminado.
Um quarto processo de incrustação da cinta consiste em criar olocal da cinta por retirada de matéria. A espessura do laminado é reduzidalocalmente no nível das extremidades, a fim de criar o local da cinta.
A ligação ilustrada na figura 4 pode ser obtida, utilizando-se oprimeiro processo de incrustação. De acordo com esse processo, pelo me-nos a camada 3 do laminado 2 é aquecida, a fim de fazê-la se fundir. Umapressão é em seguida exercida sobre a cinta 7, a fim de incrustá-la na ca-mada 3. Quando a presente invenção é exercida sobre a cinta 7, a camada 3que é fundida se deforma. De acordo com esse processo, a camada 3 deveser aquecida em uma largura superior ou igual à largura da cinta 7. Se váriascamadas do laminado forem aquecidas, quando da incrustação da cinta 7, oconjunto dessas camadas aquecidas poderá se deformar. Em geral, a de-formação das camadas é controlada pela espessura desejada da zona sol-dada, a espessura da zona soldada sendo superior ou igual à espessura dolaminado. Finalmente, a ligação é resfriada no nível da zona soldada e dazona de incrustação.
Quando só as bordas da cinta 7 são incrustadas no laminado; oprimeiro-processo de incrustação-consiste-em exercer pelo menos umapressão sobre essas bordas a incrustar.
A utilização do primeiro processo para incrustar a cinta 7 é ilus-trada também na figura 5r A primeira etapa do processo consiste em aque-cer pelo menos a-camada 5 do laminado, a fim de fazê-la se fundir; em apli-car uma pressão sobre a cinta, a fim de incrustá-la no laminado; em resfriara ligação.
A figura 6 ilustra uma outra ligação resultante da utilização doprimeiro processo de incrustação. A ligação se caracteriza por uma defor-mação do laminado e da cinta no nível da zona soldada. Esse processo deincrustação da cinta 7 na camada 3 do laminado 2 compreende uma primei-ra etapa que consiste em aquecer pelo menos as camadas 3 e 8, a fim defazê-las se fundirem; uma segunda etapa de colocação da cinta 7 em pres-são; e enfim uma terceira etapa de resfriamento da ligação. Quando a pres-são é exercida sobre a cinta 7, as camadas 3 e 8 que são fundidas se de-formam. De acordo com esse processo, a camada 3 deve ser aquecida emuma largura superior ou igual à largura da cinta 7. Se várias camadas dolaminado forem aquecidas, quando da incrustação da cinta 7, o conjuntodessas camadas aquecidas poderá ser deformado. A deformação da cintapor escoamento da camada 8 é particularmente vantajosa, pois permite su-primir as bordas salientes dessa cinta, e leva a uma espessura da zona sol-dada mais homogênea. Esse processo permite incrustar uma cinta sobre asuperfície externa ou interna da embalagem.
A fim de evitar as bordas salientes dessa cinta e a fim de facilitara incrustação, um corte facetado das bordas da cinta é particularmente van-tajoso.
A cinta incrustada 7 pode ser impressa ou transparente; ela po-de ser colada ou soldada sobre a superfície do laminado; ela pode conteruma camada barreira, a fim de compensar uma eventual descontinuidade dacamada barreira no nível da zona soldada. Preferencialmente, a espessuradessa cinta é inferior à semi-espessura do laminado.
A invenção é particularmente vantajosa, pois ela permite realizarembalagens, soldando ponta a ponta películas que associam camadas sol-dantes e camadas que não se soldam ponta a ponta. A invenção permiteligar ponta a ponta as extremidades de uma película, cujas extremidades sesoldam parcialmente.
A invenção permite obter embalagens soldadas com uma varia-ção de espessura desprezível no nível da zona soldada e tendo uma resis-tência da zona soldada equivalente à resistência da película. As embalagensobtidas podem ser impressas sobre toda a sua superfície em ruptura da im-pressão na zona soldada. A invenção permite a obtenção de embalagens degrande resistência e com estética melhorada.A invenção não se limita aos exemplos ilustrados pelas figuras 4a 6. Em particular, ela não se refere somente aos tubos, cujas extremidadessão soldadas ponta a ponta, mas também os tubos cujas extremidades sesobrepõem.
Por outro lado, a invenção se aplica também a cintas incrustadassobre a superfície interna dos tubos.
Claims (11)
1. Corpo tubular de embalagem formado de um laminado consti-tuído de pelo menos um material termoplástico, cujas extremidades são fixa-das por soldagem e recobertas por uma cinta soldada e colada; corpo tubu-lar caracterizado pelo fato dessa cinta ser pelo menos parcialmente incrus-tada no laminado.
2. Corpo tubular de acordo com a reivindicação 1, no qual asextremidades são soldadas ponta a ponta; a espessura da zona soldadasendo inferior à soma da espessura do laminado e da zona.
3. Corpo tubular de acordo com a reivindicação 1 ou 2, no qual acinta é incrustada sobre sua superfície externa.
4. Corpo tubular de acordo com qualquer uma das reivindica-ções precedentes, no qual a cinta é inteiramente incrustada no laminado.
5. Corpo tubular de acordo com qualquer uma das reivindica-ções precedentes, no qual as extremidades da cinta são facetadas.
6. Processo de fabricação de um corpo tubular de acordo comqualquer uma das reivindicações precedentes, compreendendo uma etapade incrustação da cinta no laminado que consiste em exercer uma pressãosobre essa cinta, a fim de fazê-la penetrar na espessura do laminado.
7. Processo de acordo com a reivindicação 6, no qual o lamina-do é pelo menos parcialmente fundido, quando da incrustação da cinta.
8. Processo de acordo com a reivindicação 6, no qual o Iamina--do é-pelo menos parcialmente fundido,-quando da incrustação da cinta.
9. Processo de fabricação de um corpo tubular de acordo comqualquer uma das reivindicações precedentes 1 a 5, compreendendo umaetapa de preparo de uma cavidade no laminado seguida de uma etapa,quando da qual a cinta é disposta na cavidade.
10. Processo de acordo com a reivindicação 8, no qual se prepa-ra a cavidade por deformação de matéria.
11. Processo de acordo com a reivindicação 8, no qual se prepa-ra a cavidade por retirada de matéria.
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-
2007
- 2007-04-06 US US12/296,192 patent/US8916247B2/en active Active
- 2007-04-06 AT AT07735418T patent/ATE496759T1/de active
- 2007-04-06 CA CA2646731A patent/CA2646731C/fr active Active
- 2007-04-06 DE DE602007012215T patent/DE602007012215D1/de active Active
- 2007-04-06 ES ES07735418T patent/ES2358229T3/es active Active
- 2007-04-06 BR BRPI0710302-6A patent/BRPI0710302B1/pt active IP Right Grant
- 2007-04-06 WO PCT/IB2007/051249 patent/WO2007113782A2/fr active Application Filing
- 2007-04-06 PL PL07735418T patent/PL2004389T3/pl unknown
- 2007-04-06 MX MX2008012806A patent/MX2008012806A/es active IP Right Grant
- 2007-04-06 EP EP07735418A patent/EP2004389B1/fr active Active
- 2007-04-06 JP JP2009503724A patent/JP2009532240A/ja active Pending
- 2007-04-06 CN CN200780012188XA patent/CN101415537B/zh active Active
- 2007-04-06 RU RU2008143421/05A patent/RU2431589C2/ru active
-
2009
- 2009-07-03 HK HK09105950.8A patent/HK1126724A1/xx unknown
Also Published As
Publication number | Publication date |
---|---|
WO2007113782A2 (fr) | 2007-10-11 |
EP2004389B1 (fr) | 2011-01-26 |
JP2009532240A (ja) | 2009-09-10 |
RU2008143421A (ru) | 2010-05-20 |
DE602007012215D1 (de) | 2011-03-10 |
CN101415537B (zh) | 2012-06-27 |
RU2431589C2 (ru) | 2011-10-20 |
US20090286025A1 (en) | 2009-11-19 |
ATE496759T1 (de) | 2011-02-15 |
CA2646731A1 (fr) | 2007-10-11 |
US8916247B2 (en) | 2014-12-23 |
WO2007113782A3 (fr) | 2007-12-06 |
CN101415537A (zh) | 2009-04-22 |
EP2004389A2 (fr) | 2008-12-24 |
CA2646731C (fr) | 2013-09-10 |
HK1126724A1 (en) | 2009-09-11 |
MX2008012806A (es) | 2008-10-15 |
ES2358229T3 (es) | 2011-05-06 |
BRPI0710302B1 (pt) | 2018-05-22 |
PL2004389T3 (pl) | 2011-06-30 |
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