ES2731935A1 - Soldadura de una boquilla de toma - Google Patents

Soldadura de una boquilla de toma Download PDF

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Publication number
ES2731935A1
ES2731935A1 ES201830478A ES201830478A ES2731935A1 ES 2731935 A1 ES2731935 A1 ES 2731935A1 ES 201830478 A ES201830478 A ES 201830478A ES 201830478 A ES201830478 A ES 201830478A ES 2731935 A1 ES2731935 A1 ES 2731935A1
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ES
Spain
Prior art keywords
sheets
ribs
welding
plastic
outer edges
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Pending
Application number
ES201830478A
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English (en)
Inventor
Cortina Ramón Pradas
I Arbusà Martí Nogue
Morujo Carlos Almor
Torres Luis Alberto Santini
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Georg Menshen GmbH and Co KG
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Georg Menshen GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Georg Menshen GmbH and Co KG filed Critical Georg Menshen GmbH and Co KG
Priority to ES201830478A priority Critical patent/ES2731935A1/es
Priority to PCT/EP2019/000143 priority patent/WO2019219235A1/de
Priority to EP19727824.5A priority patent/EP3793808B1/de
Priority to RS20240229A priority patent/RS65227B1/sr
Publication of ES2731935A1 publication Critical patent/ES2731935A1/es
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/003—Protecting areas of the parts to be joined from overheating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/234—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being in the form of tessellations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/302—Particular design of joint configurations the area to be joined comprising melt initiators
    • B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
    • B29C66/30223—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined said melt initiators being rib-like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/322—Providing cavities in the joined article to collect the burr
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B29C66/5326—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially flat
    • B29C66/53261—Enclosing tubular articles between substantially flat elements
    • B29C66/53262—Enclosing spouts between the walls of bags, e.g. of medical bags
    • B29C66/53263—Enclosing spouts between the walls of bags, e.g. of medical bags said spouts comprising wings, e.g. said spouts being of ship-like or canoe-like form to avoid leaks in the corners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/74—Auxiliary operations
    • B31B50/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B50/84—Forming or attaching means for filling or dispensing contents, e.g. valves or spouts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/18—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for making package-opening or unpacking elements
    • B65B61/186—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for making package-opening or unpacking elements by applying or incorporating rigid fittings, e.g. discharge spouts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5861—Spouts
    • B65D75/5872—Non-integral spouts
    • B65D75/5883—Non-integral spouts connected to the package at the sealed junction of two package walls

Abstract

La invención se refiere a un procedimiento para soldar una boquilla de toma con su área de soldadura, que presenta nervios, entre las láminas de plástico flexibles de una bolsa de envase, en el que los bordes exteriores de los nervios del área de soldadura se calientan a la temperatura de soldadura y se disponen en estado fundido entre las zonas marginales de las láminas de plástico de la bolsa, y las láminas se aprietan contra los bordes exteriores de los nervios.

Description

DESCRIPCIÓN
Soldadura de una boquilla de toma
La invención se refiere a un procedimiento para soldar una boquilla de toma con su área de soldadura, que presenta nervios, entre las láminas de plástico flexibles de una bolsa de envase.
Por el documento DE 102006 030 234 A1 se conoce el procedimiento consistente en calentar una boquilla de toma (spout) e introducir la misma en estado caliente en una abertura de una bolsa de plástico. Después, la boquilla de toma introducida se suelda con la bolsa dentro de la abertura mediante una aportación de calor adicional. Un procedimiento de este tipo requiere mucho tiempo y trabajo.
El objetivo de la invención consiste en perfeccionar un procedimiento para soldar una boquilla de toma en una bolsa de tal modo que con poco gasto de producción, tiempo y energía se logre una unión muy hermética entre la bolsa de envase y la boquilla de toma.
Este objetivo se logra de acuerdo con la invención de la siguiente manera: los bordes exteriores de los nervios del área de soldadura se calientan a la temperatura de soldadura y se disponen en estado fundido entre las zonas marginales de las láminas de plástico de la bolsa, y las láminas se aprietan contra los bordes exteriores de los nervios.
En este procedimiento no se calienta toda la boquilla de toma a la temperatura de soldadura, sino únicamente los bordes exteriores de los nervios que sobresalen de la boquilla de toma. Una radiación calorífica de este tipo dirigida únicamente a la cara exterior de la boquilla de toma solo ha de ser aplicada muy brevemente para fundir los bordes exteriores de los nervios.
En este contexto resulta especialmente ventajoso que la sección transversal de los bordes exteriores de los nervios se deforme en forma de T cuando éstos son apretados en estado fundido contra la pared interior de las láminas, para de este modo crear una mayor superficie de apoyo en la pared interior de las láminas.
Preferiblemente se propone que los nervios, que sobresalen hacia afuera en el área de soldadura, formen entre sí numerosas cámaras para recoger material plástico fundido. Las cámaras recogen con seguridad la masa fundida desplazada, correspondiendo el tamaño de las cámaras preferiblemente al volumen desplazado, con lo que se crea una superficie lisa entre la lámina y la boquilla de toma o pieza de soldadura y, con ello, un bonito aspecto liso ideal por la cara exterior. La sección transversal vertical de las cámaras puede tener una forma circular, ovalada, rectangular o rómbica.
Preferiblemente, el área de soldadura de la boquilla de toma configura nervios cuyos bordes exteriores se funden por el calentamiento, y las superficies interiores de las láminas de la bolsa se aprietan sobre los bordes exteriores fundidos. Además se propone que la boquilla de toma y al menos las superficies interiores de las áreas marginales de las láminas consistan en el mismo plástico o en el mismo tipo de plástico, y que las láminas de una, dos o más capas de la bolsa de envase consistan en el mismo plástico o en el mismo tipo de plástico que el de la boquilla de toma. De este modo se puede lograr una alta pureza de variedad de la bolsa de envase.
Las ventajas arriba mencionadas también se logran de forma óptima si el calentamiento de los bordes exteriores de los nervios del área de soldadura a la temperatura de soldadura tiene lugar sin contacto a través de calor radiante o de rayos láser. Esto reduce además la formación de vapores y gases durante el calentamiento.
En los dibujos están representados en perspectiva ejemplos de realización del área de soldadura de la boquilla de toma según la invención. Se muestran
en la Figura 1 el área de soldadura con cuatro nervios horizontales con espacios intermedios,
en la Figura 2 el área de soldadura con cuatro nervios horizontales con espacios intermedios cerrados lateralmente,
en la Figura 3 el área de soldadura con numerosas cámaras rectangulares abiertas hacia afuera,
en la Figura 4 el área de soldadura con numerosas cámaras rectangulares de tamaños diferentes abiertas hacia afuera,
en la Figura 5 el área de soldadura con numerosas cámaras rómbicas abiertas hacia afuera,
en la Figura 6 el área de soldadura con numerosas cámaras anulares abiertas hacia afuera,
en la Figura 7 el área de soldadura con numerosas cámaras circulares abiertas hacia afuera.
La invención se refiere a una boquilla de toma de plástico para bolsas de envase, tal como está descrita por ejemplo en el documento DE 10 2007 029 541 A1 y en el documento DE 102010006426 B4. En los dibujos adjuntos de la Figura 1 a la Figura 7 está representada únicamente el área de soldadura 1 en forma de lanzadera, que está conformada en la boquilla de vertido tubular que se puede cerrar mediante un tapón de rosca, que se puede enroscar con su rosca interior sobre la rosca exterior de la boquilla de vertido.
Una boquilla de toma de este tipo se suelda con su área de soldadura 1 entre las dos paredes laterales de la bolsa de lámina de plástico. Para ello, los dos lados del área de soldadura disponen de nervios 2 curvados horizontales (cuando el eje de la boquilla de toma tubular es vertical) que sobresalen lateralmente, sobre cuyos bordes exteriores 3 se suelda la superficie interior de las paredes laterales de la bolsa. En la realización representada en la Figura 1, los nervios 2 están formados por cuatro superficies 4 horizontales en forma de lanzadera o de rombo, que se extienden paralelas una sobre otra a distancias iguales y que forman entre las mismas tres espacios intermedios 5. A través del centro de las cuatro superficies 4 se extiende la boquilla de vertido 6 tubular. En la realización según la Figura 2, los tres espacios 5 están cerrados lateralmente por las paredes laterales 7.
Para soldar las paredes laterales de la bolsa de envase en el área de soldadura 1 de la boquilla de toma, los bordes exteriores 3 de los nervios 2 del área de soldadura se calientan a la temperatura de soldadura y se disponen en estado fundido entre las zonas marginales de las láminas de plástico de la bolsa, y las láminas se aprietan contra los bordes exteriores 3 de los nervios 2. En este contexto no se ha de calentar toda el área de soldadura, sino que solo es necesario calentar los bordes exteriores 3 de los nervios 2 hasta que se fundan. A este respecto es importante que la sección transversal de los bordes exteriores de los nervios se deforme en forma de T cuando éstos son apretados en estado fundido contra la pared interior de las láminas, para de este modo crear una mayor superficie de apoyo en la pared interior de las láminas.
En las realizaciones representadas en las Figuras 3 a 7, las dos caras exteriores 9 verticales de las áreas de soldadura 1 constituyen numerosas cámaras 8 en forma de escotaduras abiertas hacia afuera, cada una de ellas con una superficie de fondo 8a plana vertical retrasada y un borde 8b que rodea la superficie de fondo y que está configurado con forma circular, ovalada, rectangular o rómbica, de modo que la sección transversal vertical de las cámaras es circular, ovalada, rectangular o rómbica. De esta forma, cada una de las dos caras exteriores 9 verticales está dividida en numerosas cámaras 8 abiertas hacia afuera, que cubren el área de soldadura 1 distribuidas de modo uniforme y que forman entre sí los nervios 2, cuyos bordes exteriores 3 se funden tal como se explica más arriba. Al apretar la pared lateral de la bolsa sobre los nervios 2, el material plástico fundido de los nervios 2 entra a presión lateralmente en las cámaras 8, de modo que después la superficie exterior 9 o la pared lateral del área de soldadura constituye una capa uniforme con la pared interior de la lámina de bolsa.
La cantidad, el tamaño, la forma y la profundidad de las cámaras 8 dependen de la cantidad de material plástico fundido producido que ha de ser recogido por las cámaras. Cuando se produce una superficie ininterrumpida uniforme de masa de plástico fundido, se logra una función de adherencia óptima.
Resulta especialmente ventajoso que el calentamiento de los bordes exteriores 3 de los nervios 2 del área de soldadura a la temperatura de soldadura tenga lugar mediante rayos láser. Alternativamente, esto también puede tener lugar mediante calor radiante. Para ello se disponen cuerpos calientes a lo largo de los contornos de los bordes 3. En las dos alternativas de calentamiento se evita en gran medida la formación de vapores y gases.

Claims (9)

REIVINDICACIONES
1. Procedimiento para soldar una boquilla de toma con su área de soldadura (1), que presenta nervios, entre las láminas de plástico flexibles de una bolsa de envase, caracterizado por que los bordes exteriores (3) de los nervios (2) del área de soldadura se calientan a la temperatura de soldadura y se disponen en estado fundido entre las zonas marginales de las láminas de plástico de la bolsa, y las láminas se aprietan contra los bordes exteriores (3) de los nervios (2).
2. Procedimiento según la reivindicación 1, caracterizado por que la sección transversal de los bordes exteriores (3) de los nervios (2) se deforma en forma de T cuando éstos son apretados en estado fundido contra la pared interior de las láminas, para de este modo crear una mayor superficie de apoyo en la pared interior de las láminas.
3. Procedimiento según la reivindicación 1 o 2, caracterizado por que los nervios (2), que sobresalen hacia afuera en el área de soldadura (1), forman entre sí numerosas cámaras (8) para recoger material plástico fundido.
4. Procedimiento según la reivindicación 3, caracterizado por que la sección transversal vertical de las cámaras (8) tiene una forma circular, ovalada, rectangular o rómbica.
5. Procedimiento según una de las reivindicaciones precedentes, caracterizado por que el área de soldadura (1) de la boquilla de toma configura nervios (2) cuyos bordes exteriores se funden por el calentamiento, y las superficies interiores de las láminas de la bolsa se aprietan sobre los bordes exteriores (3) fundidos.
6. Procedimiento según la reivindicación 1 o 2, caracterizado por que la boquilla de toma y al menos las superficies interiores de las áreas marginales de las láminas consisten en el mismo plástico o en el mismo tipo de plástico.
7. Procedimiento según una de las reivindicaciones precedentes, caracterizado por que las láminas de una, dos o más capas de la bolsa de envase consisten en el mismo plástico o en el mismo tipo de plástico que el de la boquilla de toma.
8. Procedimiento según una de las reivindicaciones precedentes, caracterizado por que el plástico de las láminas de la bolsa de envase y de la boquilla de toma consiste en una poliolefina, preferiblemente en polietileno o en polipropileno.
9. Procedimiento según una de las reivindicaciones precedentes, caracterizado por que el calentamiento de los bordes exteriores (3) de los nervios (2) del área de soldadura a la temperatura de soldadura tiene lugar sin contacto a través de calor radiante o de rayos láser.
ES201830478A 2018-05-18 2018-05-18 Soldadura de una boquilla de toma Pending ES2731935A1 (es)

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EP19727824.5A EP3793808B1 (de) 2018-05-18 2019-05-15 Einschweissen eines entnahmestutzens
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EP3793808C0 (de) 2023-12-27

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