MX2008012806A - Cuerpo de envase tubular termoplastico con una tira incluida. - Google Patents
Cuerpo de envase tubular termoplastico con una tira incluida.Info
- Publication number
- MX2008012806A MX2008012806A MX2008012806A MX2008012806A MX2008012806A MX 2008012806 A MX2008012806 A MX 2008012806A MX 2008012806 A MX2008012806 A MX 2008012806A MX 2008012806 A MX2008012806 A MX 2008012806A MX 2008012806 A MX2008012806 A MX 2008012806A
- Authority
- MX
- Mexico
- Prior art keywords
- strip
- laminate
- layer
- tubular body
- thickness
- Prior art date
Links
- 238000004806 packaging method and process Methods 0.000 title abstract description 4
- 239000012815 thermoplastic material Substances 0.000 title abstract 2
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000003466 welding Methods 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 3
- 229920001169 thermoplastic Polymers 0.000 claims description 2
- 239000004416 thermosoftening plastic Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 239000010410 layer Substances 0.000 description 116
- 238000005304 joining Methods 0.000 description 9
- 230000004888 barrier function Effects 0.000 description 6
- 229920001903 high density polyethylene Polymers 0.000 description 6
- 239000004700 high-density polyethylene Substances 0.000 description 6
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 4
- RZXDTJIXPSCHCI-UHFFFAOYSA-N hexa-1,5-diene-2,5-diol Chemical compound OC(=C)CCC(O)=C RZXDTJIXPSCHCI-UHFFFAOYSA-N 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 229920002799 BoPET Polymers 0.000 description 3
- 239000004716 Ethylene/acrylic acid copolymer Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 3
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 229920001651 Cyanoacrylate Polymers 0.000 description 2
- 229920002873 Polyethylenimine Polymers 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229920006233 biaxially oriented polyamide Polymers 0.000 description 2
- NLCKLZIHJQEMCU-UHFFFAOYSA-N cyano prop-2-enoate Chemical class C=CC(=O)OC#N NLCKLZIHJQEMCU-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920000092 linear low density polyethylene Polymers 0.000 description 2
- 239000004707 linear low-density polyethylene Substances 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 208000031872 Body Remains Diseases 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C65/5042—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like covering both elements to be joined
- B29C65/505—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like covering both elements to be joined and placed in a recess formed in the parts to be joined, e.g. in order to obtain a continuous surface
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
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Abstract
La invención se relaciona con un cuerpo de un envase tubular formado de un laminado compuesto de al menos un termoplástico cuyos extremos están sujetos mediante soldadura y cubiertos por una tira soldada o enlazada. El cuerpo tubular de acuerdo con la invención está caracterizado en que la tira está incluida al menos parcialmente en el laminado. La invención también se relaciona con métodos para fabricar el cuerpo tubular.
Description
CUERPO DE ENVASE TUBULAR TERMOPLASTICO CON UNA TIRA INCLUIDA
CAMPO DE LA INVENCIÓN La invención cae en el campo de los tubos flexibles formados utilizando películas plásticas. De manera más específica, se relaciona con un tubo flexible cuyos extremos están soldados a tope.
TÉCNICA ANTERIOR Muchos tubos flexibles están hechos soldando los extremos de un laminado que contiene al menos una capa plástica . El método más común de soldadura consiste en formar una superposición de los extremos del laminado y en unir la cara interna en la cara superior del laminado. Esta junta tiene muchas ventajas, puesto que hace posible obtener especialmente una alta resistencia en la zona de soldadura, para garantizar las propiedades de higiene con respecto al producto envasado y asegurar buenas propiedades de barrera y de sellado. Sin embargo, esta junta puede probar ser inadecuada para envasar productos agresivos que migran a la zona de soldadura y resultan en la deslaminación del laminado. Este envase también tiene la desventaja de tener un sobreespesor significativo en la zona de soldadura, lo cual arruina las propiedades estéticas del envase. La solicitud de Patente EP 0 187 541 (Figura 1), propone el uso de una tira soldada dentro del tubo con el fin de proteger la zona de soldadura de la migración de los productos agresivos. La Figura 1 ilustra una junta 1 para envasar productos que contienen cianoacrilatos . De acuerdo con la modalidad preferida de la invención, el laminado 2 comprende una primera capa de polietileno de alta densidad (HDPE) 5 en contacto con el producto envasado, una capa de aluminio 4 y una segunda capa de HDPE 3 en la superficie externa. El laminado 2 también comprende una capa de polietilenimina (PEI) y una capa de un copolimero de etileno/ácido acrilico (EAA) entre las capas 5 y 4 y también una capa de EAA entre las capas 4 y 3 con el fin de asegurar una buena adhesión entre las capas 3, 4 y 5. Los extremos del laminado 2 forman una superposición en la zona de soldadura 6. La tira de HDPE 7 se suelda en la cara interna de la junta 1 y se localiza adentro del tubo. La tira 7 permite que la difusión de los cianoacrilatos en la zona de soldadura se haga más lenta, y evita los problemas de deslaminación. La Patente US 4 733 800 (Figura 2), describe el uso de una tira soldada en el interior de un tubo de plástico con el fin de eliminar el efecto de deformación residual del envase cuando se comprime el producto. Esta falta de deformación residual, también conocida como "pliegue muerto" por una persona con experiencia en la técnica, permite que el aire entre al envase conforme el último es vaciado, lo cual resuelta en una oxidación acelerada del producto envasado. Para superar esta desventaja, la Patente US 4733800, propone el uso de una tira soldada dentro del tubo, que comprende una capa metálica. El tubo se forma por la junta 1 de un laminado 2, soldado a tope. El laminado 2 comprende al menos una capa metálica 4 que tiene un espesor de entre 5 y 40 mieras y una capa soldable 5. La tira 7 soldada en la cara interna de la junta 1 se superpone sobre los extremos del laminado 2 en la zona 6 de soldadura a tope. La tira 7 localizada en el interior del tubo comprende al menos una capa metálica que tiene un espesor de entre 40 y 200 mieras y también dos capas soldables 8 y 10. La tira 7 hace posible evitar la deformación residual del tubo durante la extracción del producto, y refuerza la zona de soldadura debido al espesor de la capa metálica 9. Sin embargo, la invención descrita en la Patente US 4733800 tiene varias desventajas principales. Una primera desventaja es el hecho de que la capa metálica 9 está en contacto directo con el producto envasado, lo cual crea problemas cuando el producto es comida. Una segunda desventaja está relacionada con el gran espesor de la tira, lo cual hace la unión de la parte superior del tubo en el cuerpo tubular deficiente, o incluso imposible. La Solicitud de Patente JP 06166107 (Figura 3), propone el uso de una tira soldada dentro del tubo, con el fin de superar las desventajas de soldar superponiendo los extremos del laminado. La Solicitud de Patente JP 06166107, propone especialmente evitar el contacto de las capas de barrera con el producto envasado colocando los extremos del laminado de manera que se unen a tope y soldando una tira que une los extremos. Un tubo se forma de la junta 1 de un laminado 2 cuyos extremos se colocan de manera que se unen a tope. Los extremos 6 no se sueldan juntos; se unen vía la tira 7 soldada en la cara interna del laminado. De acuerdo con la Solicitud de Patente JP 06166107, la tira puede comprender varias capas, y la capa soldada es de naturaleza idéntica a la capa inferior 5 del laminado. La invención descrita en la Solicitud de Patente JP 06166107, es ventajosa para unir laminados no soldables de manera que se unen a tope. Sin embargo, tiene varias desventajas. Una primera desventaja está relacionada con la estética, puesto que la superficie externa del tubo incluye una ruptura en su superficie externa en la junta a tope 6. Una segunda desventaja está relacionada con el sobreespesor creado por la tira interna, lo cual hace difícil la unión de la parte superior del tubo en el cuerpo tubular. Problema a ser resuelto La adición de una tira que une los extremos de un laminado soldado a tope con el fin de formar cuerpos tubulares, tiene muchas ventajas. Sin embargo, los tubos formados de estos cuerpos tubulares tienen varias desventa as . Cuando la tira se suelda o enlaza en la superficie externa del laminado, pueden aparecer defectos durante la impresión del cuerpo tubular; estos defectos en la decoración están relacionados con el sobreespesor creado por la tira. Otra desventaja de la adición de una tira en la superficie externa del envase está relacionada con el hecho de que el consumidor puede sentir el sobreespesor de la tira cuando sostiene el envase. La sensación creada es particularmente dañina para el uso de estos tubos en el mercado de cosméticos. Cuando la tira se agrega en la superficie interna del cuerpo tubular, es la soldadura de la parte superior del tubo en el cuerpo tubular la que plantea dificultades. En realidad, se observa que el sobreespesor creado por la tira conduce al riesgo de que el envase se fugue en la parte superior soldada.
Definición de los términos utilizados en el sumario de la invención En el sumario de la invención, se utilizan los siguientes términos y abreviaturas: Laminado: película con múltiples capas que resulta de la laminación de varias películas; BOPET: tereftalato de polietileno orientado biaxialmente; BOPP: polipropileno orientado biaxialmente; BOPA: poliamida orientada biaxialmente; PE: polietileno; LDPE: polietileno de baja densidad; LLDPE: polietileno lineal de baja densidad; HDPE: polietileno de alta densidad; EVOH: alcohol etilen-vinílico; Adhesivo: adhesivo utilizado durante la preparación de los laminados para unir varias películas j untas; Pegamento: producto adhesivo utilizado para enlazar la tira al laminado; Soldadura: la operación de soldadura que tiene el objeto de unir, mediante fusión, dos materiales que tienen la misma naturaleza o que son miscibles en el estado fundido, la miscibilidad se manifiesta por la difusión y la interpenetración de las cadenas moleculares; a continuación mediante el enfriamiento de los materiales con el fin de congelar el estado de la interpenetración molecular. Enlace: a diferencia de la soldadura, el enlace se define como una operación para unir dos materiales que no son de la misma naturaleza o que son inmiscibles en el estado fundido. El enlace puede tener lugar mediante mecanismos químicos (reacción de los extremos de la cadena, reticulación) , o mecanismos físicos (fuerzas de van der Waals, evaporación) . El enlace es una operación que puede llevarse a cabo a temperatura ambiente o mediante calentamiento de los materiales.
SUMARIO GENERAL DE LA INVENCIÓN La invención consiste en incluir, al menos parcialmente, la tira soldada en el laminado, de manera que el espesor de la tira soldada que sobresale es menor que el espesor de la tira. En el presente texto, como se observará posteriormente, el término "incluir" significa ya sea "insertar en una superficie rebajada" o "empujar en una superficie que inicialmente carece de un rebajo". De acuerdo con una modalidad de la invención, la tira está incluida en el laminado y las superficies respectivas del laminado y de la tira son tangenciales. El primer método de inclusión consiste en ejercer
52-543 una presión en la tira con el fin de hacerla penetrar en el espesor del laminado cuando el último está en un estado al menos parcialmente fundido. Un segundo método consiste en incluir la tira en un laminado en el estado sólido, y comprende al menos una operación para presurizar la tira. Un tercer método de incluir la tira se basa en una deformación del laminado antes de la aplicación de la tira. Este método comprende un paso de deformación en frío o caliente del laminado con el fin de crear la ubicación para la tira. Un cuarto método de inclusión consiste en crear la ubicación de la tira retirando el material. El espesor del laminado se reduce localmente a nivel con los extremos con el fin de crear la ubicación de la tira. Para facilitar la inserción de la tira, los bordes de la tira pueden estar biselados. Cuando la tira se incluye en la superficie externa del envase, el atractivo del empaque no se arruina. Cuando la tira se incluye en la superficie interna del envase, la soldadura del componente en el cuerpo tubular permanece de alta calidad. La invención se entenderá mejor a partir de la descripción de las modalidades de ésta y de las siguientes Figuras, en las cuales:
52-543 Las Figuras 1 a 3 describen los usos principales de una tira de soldadura conocida en la técnica anterior para unir los extremos soldados de un laminado. La Figura 1 ilustra el uso de una tira para limitar la migración de los componentes agresivos contenidos en el envase. La Figura 2 ilustra el uso de una tira para eliminar el efecto de deformación residual del tubo cuando se comprime para extraer el producto. La Figura 3 ilustra el uso de una tira soldada en el interior del tubo, con el fin de superar las desventajas de la soldadura mediante superposición de los extremos del laminado . Las Figuras 4 a 6 ilustran varias modalidades de la invención. La Figura 4 presenta una primera modalidad ejemplar de la invención, que consiste en incluir al menos parcialmente la tira en la capa que forma la superficie del envase . La Figura 5 presenta otra modalidad ejemplar de la invención, que consiste en incluir al menos parcialmente la tira en el espesor del laminado. La Figura 6 ilustra una tercera modalidad ejemplar de la invención, que consiste en incluir y deformar la tira.
52-543 SUMARIO DETALLADO DE LA INVENCIÓN La invención consiste de un método novedoso para preparar un tubo soldando a tope los extremos de un laminado; el método consiste en agregar una tira que une los extremos del laminado y en incluir al menos parcialmente la tira en la superficie del laminado, de manera que se elimina la falta de atractivo y los efectos técnicos adversos relacionados con la presencia de la tira; y con el fin de mejorar la resistencia de la junta. La Figura 4 ilustra una primera modalidad ejemplar de la invención. Un cuerpo tubular 1 se forma soldando a tope los extremos de un laminado 2. Una tira 7 une los extremos del laminado y refuerza la zona de soldadura 6. La invención está caracterizada en que la tira 7 está incluida en la capa 3 que forma la superficie superior del laminado. De manera preferida, el espesor de la tira que sobresale es menor que la mitad de su espesor. Idealmente, la tira está incluida completamente en el laminado, de manera que la superficie de la junta forma una superficie uniforme y continua. El laminado ilustrado en la Figura 4 comprende una capa 3 que forma la superficie superior del laminado; una segunda capa 5 que forma la superficie inferior del laminado y una capa 4 atrapada entre las capas 3 y 5; las capas 3, 4 y 5 pueden posiblemente ser de naturalezas
52-543 diferentes; y las capas 3, 4 y 5 se unen en su interfaz. El laminado 2 comprende generalmente una o más capas que no pueden soldarse a tope. La capa 4 que forma una capa delgada que tiene propiedades de barrera, no se suelda generalmente en sus extremos. La capa 4 es, por ejemplo, una hoja delgada de aluminio o una capa de EVOH (alcohol etilen-vinilico) . En la Figura 4, la capa 5 que forma la superficie interna del tubo se suelda en sus extremos con el fin de garantizar la preservación correcta del producto envasado y para evitar que el producto envasado entre en contacto con los extremos no soldados del laminado 2. Una capa 5 hecha de poliolefina es ventajosa. La tira 7 se une a la capa superior 3 mediante soldadura o enlace. Cuando la tira 7 se suelda, la tira 7 comprende al menos una capa de la misma naturaleza de la capa superior 3 del laminado. Cuando la tira 7 se suelda, la capa 3 está compuesta de manera ventajosa de poliolefina (PE o PP) . La tira 7 ilustrada en la Figura 4 es de manera preferida de un espesor pequeño con el fin de hacer más fácil la inclusión en la capa 3 del laminado; el espesor usualmente es menor que la mitad del espesor del laminado con el fin de evitar un sobreespesor significativo en la zona de soldadura 6. La tira 7 comprende de manera ventajosa varias capas, de las cuales una es una capa con alta resistencia y una es una capa con un bajo espesor.
52-543 Esta capa de alta resistencia es hecha, por ejemplo, de un polímero orientado biaxialmente . La tira también puede contener una capa delgada que tiene un efecto de barrera. La tira 7 también comprende una capa de unión con la capa 3 del laminado; esta capa de unión es de la misma naturaleza que la capa 3 cuando la tira se suelda; esta capa es un adhesivo cuando la tira se enlaza en la capa 3. Con una tira que comprende varias capas, el espesor de la tira puede reducirse y la inclusión de la misma en el espesor del laminado puede facilitarse. La tira 7 hace posible incrementar la resistencia de la zona de soldadura 6 y superar el hecho de que la soldadura a tope de los extremos del laminado tiene una resistencia menor que aquélla del laminado. Al final, la tira compensa el hecho de que algunas capas del laminado no están soldadas. La Figura 4 ilustra la inclusión de una tira 7 en la superficie superior de un laminado 2 que forma la superficie externa de un cuerpo tubular 1. De acuerdo con otra modalidad de la invención, la tira 7 está incluida en la capa inferior 5 del laminado que forma la capa interna del envase. De acuerdo con esta modalidad, la tira 7 comprende al menos una capa que está soldada en la capa 5 del laminado. De manera preferida, la tira 7 comprende una capa de la misma naturaleza que la capa 5 del laminado; usualmente la capa 5 es una capa de poliolefina. La tira 7
52-543 comprende de manera preferida una capa delgada de un polímero orientado biaxialmente atrapada entre dos capas soldables; una primera capa que permite que la tira 7 se suelde a la capa 5, y una segunda capa que permite que la tira 7 se suelde en la parte superior del tubo que se una a la capa interna 5 del cuerpo tubular 1. Otra modalidad de la invención consiste en incluir únicamente los bordes de la tira 7; la tira 7 posiblemente está incluida en la capa superior 3 o la capa inferior 5 del laminado 2. La Figura 5 ilustra otro ejemplo de incluir una tira en un laminado que comprende al menos dos capas; una primera capa superior 3 que forma la superficie superior del laminado y una segunda capa 5 que forma la superficie inferior del laminado y la superficie interna del envase. La tira 7 se sujeta a la capa 3 que forma la capa superior del envase y se incluye en el espesor del laminado; la inclusión de la tira 7 en el espesor de la capa 3 no es posible tomando en cuenta el espesor o las propiedades de la capa 3. La Figura 5 ilustra el enlace de la tira 7 en la capa 3. El enlace de la tira 7 es particularmente ventajoso cuando la capa superior 3 es una capa de un polímero orientado biaxialmente (BOPET o BOPP) o cuando la capa superior 3 está impresa en su superficie externa. Una tira que comprende una capa de un polímero orientado
52-543 biaxialmente y una capa adhesiva es particularmente ventajosa tomando en cuenta su espesor muy pequeño y su alta transparencia. La Figura 5 ilustra el hecho de que la tira es unida a la capa 3 e incluida en el laminado deformando la capa inferior 5. La Figura 6 ilustra un tercer ejemplo de incluir una tira en el espesor de un laminado. Un cuerpo tubular 1 se forma de un laminado 2 cuyos extremos están soldados a tope. El laminado comprende una capa 3 que forma la superficie superior del laminado; una capa 4 que forma la superficie inferior del laminado y la superficie interna del envase y una capa 4 atrapada entre las capas 3 y 5. Generalmente, la capa 4 del laminado no está soldada a tope tomando en cuenta su pequeño espesor o sus propiedades. Una tira 7 se une a la capa 3 del laminado y refuerza la zona de soldadura 6. La tira 7 ilustrada en la Figura 6 comprende al menos dos capas; una primera capa 9 de alta resistencia y de un espesor pequeño y una segunda capa 8 que está soldada en la capa 3 del laminado. De manera preferida, las capas 8 y 3 son de la misma naturaleza. La tira 7 se suelda e incluye en la capa 3 del laminado. La tira 7 se deforma por el flujo de la capa 8 al momento en que la tira se incluye en el espesor del laminado. Varios métodos para incluir la tira en el espesor del laminado pueden considerarse.
52-543 Un primer método para incluir la tira consiste en empujar la tira en un laminado al menos parcialmente fundido y comprende al menos una operación de ejercer presión en la tira. La inclusión de la tira puede llevarse a cabo junto con, o después de la soldadura a tope del laminado, y junto con o después de la soldadura o enlace de la tira en el laminado. Un segundo método de incluir la tira consiste en empujar la tira en un laminado en estado sólido, y comprende al menos una operación de ejercer presión en la tira. La inclusión de la tira se lleva a cabo después de la soldadura a tope del laminado y junto con, o después de la soldadura o enlace de la tira en el laminado. Un tercer método de incluir la tira se basa en una deformación del laminado antes de la aplicación de la tira. Este método comprende un paso de deformación en caliente o frió del laminado, con el fin de crear la ubicación de la tira. La deformación del laminado se lleva a cabo de manera preferida cuando está plano, antes de unir los extremos del laminado de manera que se unen a tope. Un cuarto método de inclusión consiste en crear la ubicación de la tira retirando material. El espesor del laminado se reduce localmente a nivel con los extremos con el fin de crear la ubicación de la tira. La junta ilustrada en la Figura 4 puede obtenerse
52-543 utilizando el primer método de inclusión. De acuerdo con este método, al menos la capa 3 del laminado 2 se calienta con el fin de hacer que se funda. Una presión se ejerce a continuación en la tira 7 con el fin de incluirla en la capa 3. Cuando la presión es ejercida en la tira 7, la capa 3, la cual está fundida, se deforma. De acuerdo con este método, la capa 3 debe calentarse sobre un ancho que es mayor que, o igual al ancho de la tira 7. Si varias capas del laminado se calientan durante la inclusión de la tira 7, todas las capas calentadas pueden deformarse. En general, la deformación de las capas se controla por el espesor deseado de la zona de soldadura, el espesor de la zona de soldadura es mayor que o igual al espesor del laminado. Finalmente, la junta se enfria en la zona de soldadura y la zona de inclusión. Cuando sólo los bordes de la tira 7 se incluyen en el laminado, el primer método de inclusión consiste en ejercer al menos una presión en los bordes a ser incluidos. El uso del primer método de inclusión de la tira 7 también se ilustra en la Figura 5. El primer paso del método consiste en calentar al menos la capa 5 del laminado con el fin de hacer que se funda; en aplicar una presión a la tira 7 con el fin de incluirla en el laminado; y en enfriar la junta. La Figura 6 ilustra otra junta que resulta del
52-543 uso del primer método de inclusión. La junta está caracterizada por una deformación del laminado y la tira en la zona de soldadura. Este método de incluir la tira 7 en la capa 3 del laminado 2, comprende un primer paso que consiste en calentar al menos las capas 3 y 8 con el fin de hacer que se fundan; un segundo paso de poner la tira 7 bajo presión y finalmente un tercer paso de enfriar la junta. Cuando la presión se ejerce en la tira 7, las capas 3 y 8, las cuales están fundidas, se deforman. De acuerdo con este método, la capa 3 debe calentarse sobre un ancho mayor que o igual al ancho de la tira 7. Si varias capas del laminado se calientan durante la inclusión de la tira 7, todas las capas calentadas pueden deformarse. La deformación de la tira mediante el flujo de la capa 8 es particularmente ventajosa, puesto que evita que los bordes de la tira sobresalgan, y conduce a un espesor más homogéneo de la zona de soldadura. Este método permite que una tira se incluya en la superficie externa o interna del envase . Con el fin de evitar que los bordes de la tira sobresalgan y con el fin de facilitar la operación de inclusión, un corte a bisel de los bordes de la tira es particularmente ventajoso. La tira incluida 7 puede ser impresa o transparente; puede enlazarse o soldarse en la superficie del
52-543 laminado; puede contener una capa de barrera con el fin de compensar una posible discontinuidad de la capa de barrera en la zona de soldadura. De manera preferida, el espesor de la tira es menor que la mitad del espesor del laminado. La invención es particularmente ventajosa en que permite que el envase se produzca soldando a tope las películas que combinan las capas soldables a tope con las capas que no pueden soldarse a tope. La invención permite que los extremos de una película se unan de manera que se unen a tope, los extremos de película la cual están parcialmente soldados juntos. La invención hace posible obtener un envase soldado con una variación despreciable en el espesor en la zona de soldadura y que tiene una resistencia de la zona de soldadura que es equivalente a la resistencia de la película. El envase obtenido puede imprimirse sobre toda su superficie sin una interrupción de la impresión en la zona de soldadura. La invención hace posible obtener un envase que tiene una alta resistencia y una estética mejorada. La invención no está limitada a los ejemplos ilustrados en las Figuras 4 a 6. En particular, se relacionan sólo con los tubos cuyos extremos están soldados a tope, sino también con tubos cuyos extremos se superponen. Además, la invención también se aplica a tiras incluidas en la superficie interna de tubos.
52-543
Claims (1)
- REIVINDICACIONES : 1. Un cuerpo de un envase tubular formado de un laminado compuesto de al menos un termoplástico, cuyos extremos están sujetos mediante soldadura y cubiertos por una tira soldada o enlazada; el cuerpo tubular está caracterizado en que la tira está incluida al menos parcialmente en el laminado. 2. El cuerpo tubular según la reivindicación 1, en el cual los extremos están soldados a tope; el espesor de la zona de soldadura es menor que la suma del espesor del laminado y de la tira. 3. El cuerpo tubular según la reivindicación 1 ó 2, en el cual la tira está incluida en su superficie externa . 4. El cuerpo tubular según cualquiera de las reivindicaciones anteriores, en el cual la tira está incluida completamente en el laminado. 5. El cuerpo tubular según cualquiera de las reivindicaciones anteriores, en el cual los extremos de la tira están biselados. 6. Un método para fabricar un cuerpo tubular según cualquiera de las reivindicaciones anteriores, que comprende un paso de incluir la tira en el laminado, que consiste en ejercer una presión en la tira con el fin de hacerla penetrar en el espesor del laminado. 52-543 7. El método según la reivindicación 6, en el cual el laminado está al menos parcialmente fundido al momento en que la tira se incluye. 8. El método según la reivindicación 6, en la cual el laminado está en estado sólido al momento en que la tira se incluye. 9. Un método para fabricar un cuerpo tubular según cualquiera de las reivindicaciones 1 a 5 anteriores, que comprende el paso de preparar un rebajo en el laminado seguido por un paso durante el cual la tira se coloca en el rebaj o . 10. El método según la reivindicación 8, en el cual el rebajo se prepara deformando el material. 11. El método según la reivindicación 8, en el cual el rebajo se prepara retirando material. 52-543
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CN114868087A (zh) | 2019-12-29 | 2022-08-05 | 兰达公司 | 印刷方法和系统 |
EP4082757A1 (fr) | 2021-04-26 | 2022-11-02 | Aisapack Holding SA | Emballage dont la soudure est dissimulee dans l'impression et procede de fabrication |
EP4257020A1 (fr) | 2022-04-08 | 2023-10-11 | Aisapack Holding SA | Recharge pour emballage et procédé de fabrication |
EP4276030A1 (fr) | 2022-05-11 | 2023-11-15 | Aisapack Holding SA | Emballage barriere a l humidite |
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-
2007
- 2007-04-06 EP EP07735418A patent/EP2004389B1/fr active Active
- 2007-04-06 CA CA2646731A patent/CA2646731C/fr active Active
- 2007-04-06 DE DE602007012215T patent/DE602007012215D1/de active Active
- 2007-04-06 JP JP2009503724A patent/JP2009532240A/ja active Pending
- 2007-04-06 US US12/296,192 patent/US8916247B2/en active Active
- 2007-04-06 CN CN200780012188XA patent/CN101415537B/zh active Active
- 2007-04-06 AT AT07735418T patent/ATE496759T1/de active
- 2007-04-06 PL PL07735418T patent/PL2004389T3/pl unknown
- 2007-04-06 RU RU2008143421/05A patent/RU2431589C2/ru active
- 2007-04-06 ES ES07735418T patent/ES2358229T3/es active Active
- 2007-04-06 MX MX2008012806A patent/MX2008012806A/es active IP Right Grant
- 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
-
2009
- 2009-07-03 HK HK09105950.8A patent/HK1126724A1/xx unknown
Also Published As
Publication number | Publication date |
---|---|
ATE496759T1 (de) | 2011-02-15 |
DE602007012215D1 (de) | 2011-03-10 |
JP2009532240A (ja) | 2009-09-10 |
RU2008143421A (ru) | 2010-05-20 |
CN101415537B (zh) | 2012-06-27 |
CA2646731A1 (fr) | 2007-10-11 |
PL2004389T3 (pl) | 2011-06-30 |
RU2431589C2 (ru) | 2011-10-20 |
ES2358229T3 (es) | 2011-05-06 |
EP2004389A2 (fr) | 2008-12-24 |
CA2646731C (fr) | 2013-09-10 |
EP2004389B1 (fr) | 2011-01-26 |
BRPI0710302B1 (pt) | 2018-05-22 |
HK1126724A1 (en) | 2009-09-11 |
CN101415537A (zh) | 2009-04-22 |
WO2007113782A2 (fr) | 2007-10-11 |
US20090286025A1 (en) | 2009-11-19 |
US8916247B2 (en) | 2014-12-23 |
WO2007113782A3 (fr) | 2007-12-06 |
BRPI0710302A2 (pt) | 2011-08-09 |
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