ES1078665U - Waterproof paper sack with air output for pressure relief (Machine-translation by Google Translate, not legally binding) - Google Patents

Waterproof paper sack with air output for pressure relief (Machine-translation by Google Translate, not legally binding) Download PDF

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ES1078665U
ES1078665U ES201330125U ES201330125U ES1078665U ES 1078665 U ES1078665 U ES 1078665U ES 201330125 U ES201330125 U ES 201330125U ES 201330125 U ES201330125 U ES 201330125U ES 1078665 U ES1078665 U ES 1078665U
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gluing
layer
paper
pressure relief
spaces
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ES1078665Y (en
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Josep SURIOL SAUMELL
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Industrias Bolcar SL
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Industrias Bolcar SL
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Abstract

Waterproof paper bag with air outlet for pressure relief, being of the type that is configured from a multilayer tubular body comprising at least one outer paper layer (2), an intermediate plastic layer ( 3) and, at least one layer of inner paper (4) which are fixed to each other by gluing zones (5) provided in folds (1a and 1b) by bending their ends forming, respectively their upper and lower base, is characterized in that, at least in its upper or lower base, the gluing zone (5) between the intermediate layer of plastic (3) and the inner layer of paper (2) has unglued spaces (6) that allow the passage of air, while the area of gluing (5) between the rest of layers is complete and covers the entire fold. (Machine-translation by Google Translate, not legally binding)

Description

Saco de papel impermeable con salida de aire para alivio de presión. Waterproof paper bag with air outlet for pressure relief.

OBJETO DE LA INVENCIÓN OBJECT OF THE INVENTION

La invención, tal como expresa el enunciado de la presente memoria descriptiva, se refiere a un saco de papel impermeable con salida de aire para alivio de presión, el cual aporta a la función a que se destina una serie de ventajas e innovadoras características estructurales y constitutivas, que se describirán en detalle más adelante y que suponen una mejorada alternativa a lo ya conocido dentro de su campo de aplicación. The invention, as stated in the present specification, refers to a waterproof paper bag with air outlet for pressure relief, which contributes to the function to which a series of advantages and innovative structural characteristics are intended and constitutive, which will be described in detail below and that represent an improved alternative to what is already known within its scope.

Más en particular, el objeto de la invención se centra en un saco para envasado de productos, principalmente materiales pulverulentos o granulosos, el cual, siendo de tipo tubular multicapa, configurado a partir de una o más capas de papel y una capa de plástico que lo hace impermeable, estando dichas capas cerradas en su base superior e inferior mediante pliegues en los que se incorpora cola, presenta la particularidad de contar con un innovador sistema de distribución de dicha cola de cierre cuya finalidad es proporcionar un medio práctico y efectivo para descargar el aire del interior del saco durante el proceso de llenado, que permite reducir el tiempo de llenado y mantener durante más tiempo las características del producto envasado en su interior, ya que evita la existencia de perforaciones o ranuras en la capa de plástico. More particularly, the object of the invention is focused on a bag for the packaging of products, mainly powdery or granular materials, which, being of a multilayer tubular type, configured from one or more layers of paper and a layer of plastic that it makes it waterproof, said layers being closed at its upper and lower base by means of folds in which glue is incorporated, it has the peculiarity of having an innovative distribution system of said closing glue whose purpose is to provide a practical and effective means for unloading the air inside the bag during the filling process, which allows to reduce the filling time and maintain the characteristics of the product packed inside it for a longer time, since it avoids the existence of perforations or grooves in the plastic layer.

CAMPO DE APLICACIÓN DE LA INVENCIÓN FIELD OF APPLICATION OF THE INVENTION

El campo de aplicación de la presente invención se enmarca dentro del sector de los envases, centrándose particularmente en el ámbito de la industria dedicada a la fabricación de sacos tubulares de papel impermeable The scope of the present invention is part of the packaging sector, focusing particularly on the field of industry dedicated to the manufacture of waterproof paper tubular bags

ANTECEDENTES DE LA INVENCIÓN BACKGROUND OF THE INVENTION

El saco que la presente invención preconiza es del tipo que se utiliza para contener y transportar diferentes materiales, principalmente pulverulentos o granulosos, que utilizan el aire como medio de transporte. La hoja de papel permite en mayor o menor medida el paso del aire a través de él. The bag that the present invention recommends is of the type that is used to contain and transport different materials, mainly powdery or granular, that use the air as a means of transport. The sheet of paper allows to a greater or lesser extent the passage of air through it.

Existen diversos tipos de materiales que necesitan un envase de papel con una lámina de material impermeable, tal como de plástico, para que esta última mantenga las propiedades del material y lo proteja de la humedad, lo haga impermeable a las condiciones exteriores durante un periodo de tiempo. There are various types of materials that need a paper container with a sheet of impermeable material, such as plastic, so that the latter maintains the properties of the material and protects it from moisture, makes it impervious to external conditions during a period of weather.

Con el fin de que este tipo de sacos de papel con la lámina plástica puedan ser envasado sin dificultad y con una productividad adecuada a las envasadoras o ensacadoras que existen hoy en el mercado, es necesario que la lámina de plástico esté perforada o incluso rasgada (con cortes en la misma), para hacer que el aire introducido en el saco junto con el material se extraiga lo más rápidamente posible, consiguiendo una mayor eficiencia en el envasado. La existencia de dichas perforaciones en la lámina de plástico permite que el aire introducido en el saco se expulse a través de ellas. In order that this type of paper bags with the plastic sheet can be packaged without difficulty and with adequate productivity to the packing machines or baggers that exist today in the market, it is necessary that the plastic sheet is perforated or even torn ( with cuts in it), to make the air introduced into the bag along with the material as quickly as possible, achieving greater efficiency in packaging. The existence of such perforations in the plastic sheet allows the air introduced into the bag to be expelled through them.

Sin embargo, estas perforaciones en la lámina plástica debilitan la protección de las características del material así como la permeabilidad del mismo, siendo el objetivo de la presente invención desarrollar un nuevo tipo de saco de papel impermeable que permita subsanar dicho inconveniente y permita la extracción del aire durante el envasado sin la necesidad de perforar o rasgar la lámina de plástico. However, these perforations in the plastic sheet weaken the protection of the characteristics of the material as well as the permeability of the same, being the objective of the present invention to develop a new type of waterproof paper bag that allows to overcome said inconvenience and allows the extraction of the air during packaging without the need to puncture or tear the plastic sheet.

Cabe señalar, por otra parte, que si bien se conocen en el estado de la técnica algunos documentos en los que se divulgan soluciones alternativas, al menos por parte del solicitante, no se ha encontrado ninguno que presente unas características técnicas, estructurales y constitutivas semejantes a las que presenta el saco que aquí se preconiza, según se reivindica. It should be noted, on the other hand, that although some documents are known in the state of the art in which alternative solutions are disclosed, at least by the applicant, none have been found that have similar technical, structural and constitutive characteristics to those presented by the sack that is recommended here, as claimed.

EXPLICACIÓN DE LA INVENCIÓN EXPLANATION OF THE INVENTION

Así, el saco de papel impermeable que la invención propone se configura como una novedad alternativa dentro de su campo de aplicación, ya que a tenor de su implementación y de forma taxativa, se alcanzan satisfactoriamente los objetivos anteriormente señalados como idóneos, estando los detalles caracterizadores que lo distinguen de lo ya conocido, convenientemente recogidos en las reivindicaciones finales que acompañan a la presente descripción del mismo. Thus, the waterproof paper bag that the invention proposes is configured as an alternative novelty within its field of application, since in accordance with its implementation and in a restrictive way, the objectives previously indicated as suitable are satisfactorily achieved, with the characterizing details being which distinguish it from what is already known, conveniently included in the final claims that accompany the present description thereof.

En concreto, lo que la invención preconiza es un saco de papel impermeable con salida de aire para alivio de presión cuya finalidad es reducir el tiempo de llenado del saco para lo cual cuenta con salidas de aire, y permitir la mejor conservación del material envasado, evitando tener que perforar o rasgar la lámina o capa de plástico que lo hace impermeable. Specifically, what the invention advocates is a waterproof paper bag with air outlet for pressure relief whose purpose is to reduce the filling time of the bag for which it has air outlets, and allow the best preservation of the packed material, avoiding having to pierce or tear the plastic sheet or layer that makes it waterproof.

Para ello, el saco de la invención se compone de diferentes capas de papel, al menos una capa interior y una capa exterior, y una capa intermedia de plástico que lo hace impermeable, situada entre las mencionadas capas de papel. El conjunto de capas tiene forma tubular con pliegues a modo de cierre tanto en la parte superior como en la inferior. Estos pliegues se presentan fijados mediante cola situada a lo largo de su extensión y entre las diferentes capas de papel y plástico. For this, the sack of the invention is composed of different layers of paper, at least one inner layer and one outer layer, and an intermediate layer of plastic that makes it impermeable, located between said layers of paper. The set of layers has a tubular shape with folds as a closure both at the top and bottom. These folds are presented fixed by glue located along its length and between the different layers of paper and plastic.

A partir de dicha configuración ya conocida, el saco presenta como característica esencial el hecho de que la zona de encolado entre la capa intermedia de plástico y la capa interior de papel e inmediatamente inferior a esta, presenta espacios sin encolar por los que el aire será canalizado durante el proceso de llenado, pudiendo estar situados estos en los pliegues de la base superior o en los de la inferior o en ambas, según las necesidades de cada caso. From this already known configuration, the sack has as an essential feature the fact that the gluing area between the intermediate plastic layer and the inner layer of paper and immediately below this, presents unglued spaces whereby the air will be channeled during the filling process, these may be located in the folds of the upper base or those of the lower base or both, depending on the needs of each case.

Por su parte, la zona de encolado prevista entre el resto de capas de papel es completa y abarca la totalidad de cada pliegue. For its part, the area of gluing provided between the other layers of paper is complete and covers the entire fold.

Conviene señalar que, en el caso de que el saco cuente con tiras cubrefondo encoladas sobre los pliegues como protección de los mismos, la zona encolada de estas también presenta espacios sin encolar, los cuales se disponen en coincidencia con los antedichos espacios sin encolar de la zona de encolado entre la capa intermedia de plástico y la capa interior de papel inmediatamente inferior, permitiendo así el flujo de aire a través de dichos espacios. It should be noted that, in the case that the bag has bottom cover strips glued on the folds to protect them, the glued area of these also has unglued spaces, which are arranged in coincidence with the aforementioned non-glued spaces of the gluing zone between the intermediate plastic layer and the immediately inferior inner layer of paper, thus allowing the flow of air through said spaces.

Así, la capa o capas de papel interiores permiten el paso del aire del interior del saco hasta la lamina de plástico impermeable que actúa a modo de barrera impermeable, conduciendo el aire bajo presión hacia los citados espacios sin encolar de los pliegues, permitiendo evacuar el aire y aliviar la presión de forma rápida y eficiente. Thus, the inner layer or layers of paper allow the passage of air from the inside of the bag to the waterproof plastic sheet that acts as a waterproof barrier, leading the air under pressure to the aforementioned spaces without gluing the folds, allowing evacuate the air and relieve pressure quickly and efficiently.

Con esto se consigue evacuar el aire sin comprometer las cualidades de conservación del saco, ya que como se ha señalado anteriormente la capa de plástico impermeable no tiene perforaciones ni aberturas. With this it is possible to evacuate the air without compromising the preservation qualities of the bag, since, as previously indicated, the waterproof plastic layer has no perforations or openings.

Visto lo que antecede, se constata que el descrito saco de papel con salida de aire para alivio de presión representa una estructura innovadora de características estructurales y constitutivas desconocidas hasta ahora para el fin a que se destina, razones que unidas a su utilidad práctica, la dotan de fundamento suficiente para obtener el privilegio de exclusividad que se solicita. In view of the above, it is found that the described paper bag with air outlet for pressure relief represents an innovative structure of structural and constitutive characteristics unknown until now for the purpose to which it is intended, reasons that together with its practical utility, the provide sufficient grounds to obtain the privilege of exclusivity that is requested.

DESCRIPCIÓN DE LOS DIBUJOS DESCRIPTION OF THE DRAWINGS

Para complementar la descripción que se está realizando y con objeto de ayudar a una mejor comprensión de las características de la invención, se acompaña a la presente memoria descriptiva, como parte integrante de la misma, de un juego de planos, en los que con carácter ilustrativo y no limitativo se ha representado lo siguiente: To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, this descriptive report is attached, as an integral part thereof, of a set of drawings, in which with character Illustrative and not limiting, the following has been represented:

La figura número 1.- Muestra una vista en planta de un ejemplo de realización del saco de papel impermeable con salida de aire para alivio de la presión, objeto de la invención, en el cual se observa su configuración general externa y se puede apreciar los pliegues de cierre de sus bases superior e inferior. Figure number 1.- It shows a plan view of an embodiment of the waterproof paper bag with air outlet for pressure relief, object of the invention, in which its general external configuration is observed and the closing folds of its upper and lower bases.

La figura número 2.- Muestra una vista en sección de una porción de la unión de las diferentes capas del saco y zonas de encolado, habiéndose exagerado en ella las proporciones de tales elementos para facilitar su comprensión. Figure number 2.- Shows a sectional view of a portion of the junction of the different layers of the bag and gluing areas, the proportions of such elements having been exaggerated therein for ease of understanding.

La figura número 3.- Muestra una vista de los pliegues de la parte superior con una representación de la zona de encolado entre capas que no tienen salida de aire entre las capas de papel. Figure number 3.- Shows a view of the folds of the upper part with a representation of the gluing area between layers that have no air outlet between the paper layers.

La figura número 4.- Muestra una vista de los pliegues de la parte superior con una representación de la zona de encolado con salida de aire entre la capa intermedia de plástico y la capa interior de papel inmediatamente inferior. Figure number 4.- Shows a view of the folds of the upper part with a representation of the gluing area with air outlet between the intermediate plastic layer and the immediately inferior inner paper layer.

La figura número 5.- Muestra una vista en alzado de otro ejemplo de realización del saco, según la invención, en este caso con tiras cubrefondo. Figure number 5.- Shows an elevation view of another embodiment of the bag, according to the invention, in this case with bottom covers.

La figura número 6.- Muestra de nuevo una vista en sección de una porción de la unión de las diferentes capas del saco con tiras cubrefondo y sus zonas de encolado. Figure number 6.- Shows again a sectional view of a portion of the junction of the different layers of the bag with bottom covers and their gluing areas.

REALIZACIÓN PREFERENTE DE LA INVENCIÓN PREFERRED EMBODIMENT OF THE INVENTION

A la vista de las mencionadas figuras, y de acuerdo con la numeración adoptada, se puede apreciar en ellas sendos ejemplos de realización del saco de papel impermeable con salida de alivio de presión objeto de la invención, el cual comprende las partes y elementos que se indican y describen en detalle a continuación. In view of the aforementioned figures, and according to the numbering adopted, it can be seen in them two examples of realization of the waterproof paper bag with pressure relief outlet object of the invention, which comprises the parts and elements that are indicate and describe in detail below.

Así, tal como se aprecia en dichas figuras, el saco (1) en cuestión se configura a partir de un cuerpo tubular multicapa cuyos extremos se doblan en pliegues superior (1a) e inferior (1b) formando, respectivamente, su base superior e inferior, y donde dicho cuerpo multicapa comprende, al menos, una capa de papel exterior (2), una capa de plástico intermedia (3) y, al menos, una capa de papel interior (4) que se fijan entre sí mediante zonas de encolado (5) previstas en dichos pliegues (1a y 1b). Thus, as can be seen in these figures, the sack (1) in question is configured from a multilayer tubular body whose ends are folded into upper (1a) and lower (1b) folds, respectively forming their upper and lower base , and wherein said multilayer body comprises, at least, an outer paper layer (2), an intermediate plastic layer (3) and, at least, an inner paper layer (4) that are fixed together by gluing areas (5) provided in said folds (1a and 1b).

Atendiendo a las figuras 2 a 4, se puede apreciar cómo, de forma caracterizadora, entre la capa de plástico intermedia (3) y la capa de papel interior (4) inmediatamente inferior a esta, la zona de encolado (5) presenta espacios (6) sin encolar que permiten el paso del aire, mientras que, entre el resto de capas, la zona de encolado (5) no presenta ningún espacio sin encolar que deje pasar el aire, y por tanto es completa y abarca la totalidad del pliegue. According to figures 2 to 4, it can be seen how, characterizingly, between the intermediate plastic layer (3) and the inner paper layer (4) immediately below this, the gluing area (5) has spaces ( 6) without gluing that allow the passage of air, while, among the rest of the layers, the gluing area (5) does not have any space without gluing that allows the air to pass, and therefore is complete and covers the entire fold .

De esta forma, bajo la presión del envasado, el aire puede ser expulsado hacia el exterior del saco a través de dichos espacios (6) sin encolar, con lo que se evita la realización de perforaciones o rasgaduras de cualquier tipo en la capa de plástico intermedia (3). In this way, under the pressure of the packaging, the air can be expelled out of the sack through said spaces (6) without gluing, thereby avoiding perforations or tears of any kind in the plastic layer intermediate (3).

Conviene señalar que dichos espacios (6) sin encolar de la zona de encolado (5) que queda situada entre la capa de plástico intermedia (3) y la capa de papel interior (4) inmediatamente inferior a esta, se contempla o bien en el pliegue superior (1a) del saco, o bien en el pliegue inferior (1b) o bien en ambos pliegues, según convenga en cada caso. It should be noted that said spaces (6) without gluing the gluing area (5) that is located between the intermediate plastic layer (3) and the inner paper layer (4) immediately below it, is contemplated either in the upper fold (1a) of the bag, either in the lower fold (1b) or in both folds, as appropriate in each case.

Así pues, al llenar el saco de papel (1) el aire bajo presión escapa a través del espacio (6) entre la capa de plástico intermedia (3) y la capa de papel interior (4) inmediatamente inferior a esta que queda abierto. Thus, when filling the paper sack (1) the air under pressure escapes through the space (6) between the intermediate plastic layer (3) and the inner paper layer (4) immediately below that which is open.

En otra variante de realización el saco, mostrada en las figuras 5 y 6, éste cuenta con tiras cubrefondo (7) para proteger la zona de los pliegues superior e inferior (1a, 1b). En este caso las tiras cubrefondo (7) también están fijadas con una zona de encolado (5) que presenta espacios (6) sin encolar, los cuales se disponen en coincidencia con los espacios (6) sin encolar de la zona de encolado (5) que une la capa de plástico intermedia (3) y la capa de papel interior (4) inmediatamente inferior a esta, para permitir así la salida de aire. In another variant embodiment, the sack, shown in figures 5 and 6, has a bottom cover strip (7) to protect the area from the upper and lower folds (1a, 1b). In this case the bottom cover strips (7) are also fixed with a gluing area (5) that has spaces (6) without gluing, which are arranged in coincidence with the spaces (6) without gluing the gluing area (5) ) that joins the intermediate plastic layer (3) and the inner paper layer (4) immediately below it, thus allowing air to escape.

Descrita suficientemente la naturaleza de la presente invención, así como la manera de ponerla en práctica, no se considera necesario hacer más extensa su explicación para que cualquier experto en la materia comprenda su alcance y las ventajas que de ella se derivan, haciéndose constar que, dentro de su esencialidad, los ejemplos representados podrán presentar otras formas de realización que difieran solo en los detalles. Describing sufficiently the nature of the present invention, as well as the way of putting it into practice, it is not considered necessary to make its explanation more extensive so that any person skilled in the art understands its scope and the advantages that derive from it, stating that, Within their essentiality, the examples represented may present other embodiments that differ only in the details.

Claims (3)

REIVINDICACIONES 1.- SACO DE PAPEL IMPERMEABLE CON SALIDA DE AIRE PARA ALIVIO DE PRESIÓN que, siendo del tipo que se configura a partir de un cuerpo tubular multicapa que comprende, al menos, una capa de papel exterior (2), una 5 capa de plástico intermedia (3) y, al menos, una capa de papel interior (4) las cuales se fijan entre sí mediante zonas de encolado (5) previstas en pliegues (1a y 1b) por los que se doblan sus extremos formando, respectivamente, su base superior e inferior, está caracterizado porque, al menos en su base superior o inferior, la zona de encolado (5) entre la capa intermedia de plástico (3) y la capa interior de papel (2) presenta espacios sin encolar (6) que permiten el paso de aire, mientras que la zona de encolado (5) entre el resto de capas es completa y abarca la totalidad del 1.- WATERPROOF PAPER SACK WITH AIR OUTLET FOR PRESSURE RELIEF which, being of the type that is configured from a multilayer tubular body comprising at least one outer paper layer (2), a plastic layer intermediate (3) and, at least, an inner paper layer (4) which are fixed together by gluing areas (5) provided in folds (1a and 1b) by which their ends are folded forming, respectively, their upper and lower base, is characterized in that, at least in its upper or lower base, the gluing area (5) between the intermediate plastic layer (3) and the inner paper layer (2) has spaces without gluing (6) that allow the passage of air, while the gluing area (5) between the rest of the layers is complete and covers the entire 10 pliegue. 10 fold. 2.- SACO DE PAPEL IMPERMEABLE CON SALIDA DE AIRE PARA ALIVIO DE PRESIÓN, según la reivindicación 1, caracterizado porque, tanto en su base superior como en la inferior, la zona de encolado (5) entre la capa intermedia de plástico (3) y la capa interior de papel (4) inmediatamente inferior presenta espacios sin encolar (6) 2. WATERPROOF PAPER SACK WITH AIR OUTLET FOR PRESSURE RELIEF, according to claim 1, characterized in that, both at its upper and lower base, the gluing area (5) between the intermediate plastic layer (3) and the inner layer of paper (4) immediately below presents spaces without glueing (6) 15 que permiten el paso de aire, mientras que la zona de encolado (5) entre el resto de capas es completa y abarca la totalidad del pliegue. 15 that allow the passage of air, while the gluing area (5) between the rest of the layers is complete and covers the entire fold. 3.- SACO DE PAPEL IMPERMEABLE CON SALIDA DE AIRE PARA ALIVIO DE PRESIÓN, según la reivindicación 1 o 2, caracterizado porque, cuando el saco cuenta con tiras cubrefondo (7) encoladas sobre los pliegues de su 3.- WATERPROOF PAPER SACK WITH AIR OUTLET FOR PRESSURE RELIEF, according to claim 1 or 2, characterized in that, when the bag has bottom cover strips (7) glued on the folds of its 20 base superior o inferior, dichas tiras cubrefondo (7) también están fijadas con una zona de encolado (5) que presenta espacios (6) sin encolar, estando dichos espacios dispuestos en coincidencia con los espacios (6) sin encolar de la zona de encolado (5) que une la capa de plástico intermedia (3) y la capa de papel interior (4) inmediatamente inferior a esta. 20 upper or lower base, said bottom cover strips (7) are also fixed with a gluing area (5) having spaces (6) without gluing, said spaces being arranged in coincidence with the spaces (6) without gluing the area of gluing (5) that joins the intermediate plastic layer (3) and the inner paper layer (4) immediately below it.
ES201330125U 2013-02-05 2013-02-05 WATERPROOF PAPER SACK WITH AIR OUTLET FOR PRESSURE RELIEF Expired - Fee Related ES1078665Y (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2568555A1 (en) * 2014-10-29 2016-04-29 Industrias Bolcar, S.A. Multilayer bag with pressure outlet (Machine-translation by Google Translate, not legally binding)
ES2582611A1 (en) * 2015-03-13 2016-09-14 Industrias Bolcar, S.A. Multilayer bag with pressure outlet (Machine-translation by Google Translate, not legally binding)
US20190217994A1 (en) * 2016-03-25 2019-07-18 Yozgat Kraft Torba Sanayi Ve Ticaret Anonim Sirketi Sack
CN110914166A (en) * 2017-05-23 2020-03-24 比朔夫+霍莱恩欧洲股份及合伙两合公司 Valve bag capable of exhausting air

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2568555A1 (en) * 2014-10-29 2016-04-29 Industrias Bolcar, S.A. Multilayer bag with pressure outlet (Machine-translation by Google Translate, not legally binding)
ES2582611A1 (en) * 2015-03-13 2016-09-14 Industrias Bolcar, S.A. Multilayer bag with pressure outlet (Machine-translation by Google Translate, not legally binding)
US20190217994A1 (en) * 2016-03-25 2019-07-18 Yozgat Kraft Torba Sanayi Ve Ticaret Anonim Sirketi Sack
CN110914166A (en) * 2017-05-23 2020-03-24 比朔夫+霍莱恩欧洲股份及合伙两合公司 Valve bag capable of exhausting air
US11214407B2 (en) * 2017-05-23 2022-01-04 Bischof + Klein Se & Co. Kg Ventilatable valve bag

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