ES2800098A1 - Method for internal hemming of a plastic bag and device for carrying out this method (Machine-translation by Google Translate, not legally binding) - Google Patents

Method for internal hemming of a plastic bag and device for carrying out this method (Machine-translation by Google Translate, not legally binding) Download PDF

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Publication number
ES2800098A1
ES2800098A1 ES202030548A ES202030548A ES2800098A1 ES 2800098 A1 ES2800098 A1 ES 2800098A1 ES 202030548 A ES202030548 A ES 202030548A ES 202030548 A ES202030548 A ES 202030548A ES 2800098 A1 ES2800098 A1 ES 2800098A1
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Prior art keywords
sheet
hem
fold
plate
section
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Granted
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ES202030548A
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Spanish (es)
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ES2800098B2 (en
Inventor
Sanchez Juan Berenguel
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Construcciones Electromecanicas del Ter SA
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Construcciones Electromecanicas del Ter SA
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Priority to ES202030548A priority Critical patent/ES2800098B2/en
Publication of ES2800098A1 publication Critical patent/ES2800098A1/en
Application granted granted Critical
Publication of ES2800098B2 publication Critical patent/ES2800098B2/en
Priority to FR2105809A priority patent/FR3111093A1/en
Priority to TR2021/009232A priority patent/TR2021009232A2/en
Priority to DE102021114473.6A priority patent/DE102021114473A1/en
Priority to PL438083A priority patent/PL438083A1/en
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Classifications

    • 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/813—Applying closures
    • B31B70/8134—Applying strings; Making string-closed bags
    • 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/008—Stiffening or reinforcing
    • 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/262—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
    • 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/36—Folding sheets, blanks or webs by continuously feeding them to stationary members, e.g. plates, ploughs or cores
    • 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B35/00—Work-feeding or -handling elements not otherwise provided for
    • D05B35/06—Work-feeding or -handling elements not otherwise provided for for attaching bands, ribbons, strips, or tapes or for binding
    • D05B35/062—Work-feeding or -handling elements not otherwise provided for for attaching bands, ribbons, strips, or tapes or for binding with hem-turning
    • 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
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • 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
    • B31B2155/00—Flexible containers made from webs
    • 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0014—Flexible containers made from webs by folding webs longitudinally having their openings facing transversally to the direction of movement
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents

Abstract

The new method comprises a first stage in which a fold (5) is made along the longitudinal edge (6) of the first sheet (3) and at the same time an "S" fold (7) is practiced along of the longitudinal edge (8) of the second sheet (4). In the second stage, the middle section of the "S" fold is undone. The first stage is carried out by means of a device that includes five elements, which in a single step performs the fold (5) and the "S" fold (7). (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPCIÓNDESCRIPTION

Método para realizar dobladillos internos en una bolsa de plástico y dispositivo para llevar a término dicho métodoMethod for internal hemming of a plastic bag and device for carrying out this method

Campo de la invenciónField of the invention

La presente invención se refiere a un método para realizar los dobladillos internos donde se aloja la cinta de cierre y transporte de una bolsa de plástico. Este tipo de bolsa se realiza a partir de una banda de material termoplástico doblada sobre sí misma y se sirve en rollos de varias unidades de bolsas.The present invention refers to a method for making the internal hems where the closure and transport tape of a plastic bag is housed. This type of bag is made from a strip of thermoplastic material folded over itself and is served in rolls of several bag units.

Otro aspecto de la invención se refiere a un mecanismo para realizar los dobladillos según el método descrito en esta invención.Another aspect of the invention relates to a mechanism for hemming according to the method described in this invention.

Estado de la técnica anteriorPrior state of the art

Son conocidas bolsas de basura confeccionadas a partir de una banda de material termoplástico que están dotadas de una cinta para facilitar su cierre y transporte.Garbage bags made from a strip of thermoplastic material are known and are provided with a tape to facilitate their closure and transport.

Bolsas de este tipo se describen en las patentes US4624654, US5057065, US4558463 y FR2291025.Bags of this type are described in patents US4624654, US5057065, US4558463 and FR2291025.

Estas bolsas presentan un cuerpo confeccionado a partir de una lámina de material termoplástico doblada sobre sí misma que es cerrado por sus laterales quedando una abertura en la parte superior, donde se dispone la cinta de cierre y transporte alojada en unos dobladillos conformados con la propia lámina de material termoplástico.These bags have a body made from a sheet of thermoplastic material folded on itself that is closed on its sides, leaving an opening in the upper part, where the closure and transport tape is arranged housed in hems formed with the sheet itself. made of thermoplastic material.

Es conveniente que los dobladillos contenedores de la cinta estén orientados hacia el interior, para que así la superficie externa quede completamente lisa y uniforme facilitando la impresión de ornamentaciones y leyendas.It is convenient that the container hems of the tape are oriented towards the inside, so that the external surface is completely smooth and uniform, facilitating the printing of ornamentation and legends.

Estos dobladillos se realizan durante el proceso de fabricación de la bolsa, existiendo varios métodos de confección.These hems are made during the bag's manufacturing process, and there are several manufacturing methods.

La patente US4624654 describe un método para confeccionar bolsas de plástico, donde para formar dobladillos orientados hacia el interior de la bolsa, se parte de una banda de material termoplástico doblada por su eje central, que tras ser desbobinada, es abierta para efectuar un plegado de 180° de los laterales tal como se muestra en la figura 3 del documento, con lo que se forman los dobladillos en los que se insertará la cinta de cierre y asido.Patent US4624654 describes a method for making plastic bags, where to form hems facing the inside of the bag, a strip of thermoplastic material is started, folded along its central axis, which after being unwound, is opened to make a fold of 180 ° from the sides as shown in figure 3 of the document, thus forming the hems in which the closure and grip tape will be inserted.

La lámina termoplástica, con los dobladillos realizados y las cintas insertadas, se vuelve a doblar por su eje central superponiéndose nuevamente las dos mitades de la banda, haciendo coincidir los dobladillos en la cara interior como se muestra en la figura 9 del documento. Finalmente se cierran por los laterales con líneas de soldadura perpendiculares a la banda con lo que la bolsa queda terminada.The thermoplastic sheet, with the hems made and the tapes inserted, is re- fold along its central axis, overlapping again the two halves of the band, making the hems coincide on the inside as shown in figure 9 of the document. Finally, they are closed on the sides with weld lines perpendicular to the band, so the bag is finished.

Este método comporta la desventaja de que, cuando la lámina termoplástica se vuelve a doblar por su eje central, queda atrapada una cierta cantidad de aire que no puede ser expulsada. Como consecuencia, las bolsas con aire atrapado en su interior no pueden enrollarse herméticamente, por lo que el volumen de los rollos es superior al deseado.This method has the disadvantage that, when the thermoplastic sheet is folded again at its central axis, a certain amount of air is trapped and cannot be expelled. As a consequence, the bags with air trapped inside cannot be rolled hermetically, so the volume of the rolls is greater than desired.

Como solución a este problema la patente EP3393782 describe un procedimiento que también parte de una banda de material termoplástico doblada por su eje central, en el que no es necesario abrir la banda de material para conformar los dobladillos de la bolsa.As a solution to this problem, patent EP3393782 describes a process that also starts with a strip of thermoplastic material folded along its central axis, in which it is not necessary to open the strip of material to form the hems of the bag.

Como se aprecia en la figura 5a del documento EP3393782, el método parte de una lámina termoplástica doblada por su eje central sobre la que se realizan los siguientes dobleces: As can be seen in figure 5a of document EP3393782, the method starts from a thermoplastic sheet folded along its central axis on which the following folds are made:

En primer lugar, es doblada hacia atrás parte de una de las mitades de la lámina termoplástica. First, part of one half of the thermoplastic sheet is folded back.

En segundo lugar, es doblado hacia atrás el borde lateral libre de la parte doblada previamente quedando configurado un primer dobladillo en posición invertida a su uso.Second, the free side edge of the previously folded part is folded back, leaving a first hem in an inverted position for use.

En tercer lugar, es doblado el borde de la segunda mitad de lámina termoplástica quedando configurado el segundo dobladillo de la bolsa.Third, the edge of the second half of the thermoplastic sheet is folded, leaving the second hem of the bag configured.

Finalmente, es plegado el primer dobladillo realizado, de manera que se solapa sobre el segundo dobladillo.Finally, the first made hem is folded so that it overlaps the second hem.

Dado que no es necesario abrir la banda de material para conformar los dobladillos, este procedimiento soluciona el problema del aire atrapado en las bolsas, sin embargo, comporta una nueva desventaja.Since it is not necessary to open the web of material to form the hems, this procedure solves the problem of air trapped in the bags, however, it brings a new disadvantage.

Cada doblez es realizado por un dispositivo de doblado independiente, por lo que son necesarios entre tres y cuatro dispositivos de doblado, así como un mínimo de cuatro a cinco rodillos de fijación, que son situados a la entrada y salida de cada dispositivo de doblado para fijar el doblez.Each bend is made by an independent bending device, so between three and four bending devices are necessary, as well as a minimum of four to five fixing rollers, which are located at the entrance and exit of each bending device to fix the fold.

Como consecuencia, La cadena mecánica para realizar los dobladillos según el método descrito en el documento EP3393782 es muy larga, necesitando un gran espacio para su implantación en la línea de fabricación de bolsas, siendo difícil el enhebrado de la banda en los dispositivos, que requiere de un meticuloso trabajo de calibrado y sincronizado, debiéndose modificar todos estos ajustes en todos dispositivos cada vez que es modificada la medida de bolsa a confeccionar.As a consequence, the mechanical chain to make the hems according to the method described in document EP3393782 is very long, requiring a large space for its implementation in the bag manufacturing line, the threading of the band in the devices being difficult, which requires meticulous calibration and synchronization work, all these settings having to be modified in all devices each time the bag size to be made is modified .

Por último, el largo recorrido de la banda de material termoplástico por los cuatro dispositivos de doblado y los cinco rodillos de fijación, aumenta el riesgo de desplegado durante el avance del material.Lastly, the long path of the thermoplastic material strip through the four folding devices and the five fixing rollers increases the risk of unfolding during the advance of the material.

Objeto de la invenciónObject of the invention

Un objeto de la invención consiste en proporcionar un método para la realización de los dobladillos de una bolsa de plástico sin la necesidad de abrir totalmente la lámina termoplástica durante el proceso de fabricación y con un número de pasos o etapas inferior a los métodos conocidos. En concreto un método para la realización de dos dobladillos en la zona interna de la bolsa de plástico con únicamente dos pasos o etapas.An object of the invention is to provide a method for hemming a plastic bag without the need to fully open the thermoplastic sheet during the manufacturing process and with a lower number of steps or stages than known methods. Specifically, a method for making two hems in the internal area of the plastic bag with only two steps or stages.

Otro objetivo adicional de la invención consiste en proporcionar un dispositivo de doblado adecuado para hacer bolsas de plástico de acuerdo con el nuevo método reivindicado, capaz de actuar a la vez sobre las dos láminas de la banda termoplástica.A further objective of the invention is to provide a folding device suitable for making plastic bags according to the new claimed method, capable of acting on the two sheets of the thermoplastic band at the same time.

Mediante la implementación del método y el dispositivo de la invención, se reduce el espacio requerido en la línea de fabricación de bolsas para efectuar los dobladillos respecto a lo descrito en el estado de la técnica y, en consecuencia, la máquina es más compacta y simple. By implementing the method and device of the invention, the space required in the bag manufacturing line to make the hems is reduced compared to that described in the state of the art and, consequently, the machine is more compact and simple. .

También se simplifica la operación de enhebrado de la banda de material termoplástico y se reduce el riesgo de desplegado durante el avance del material.The threading operation of the thermoplastic material web is also simplified and the risk of unfolding during the advance of the material is reduced.

Explicación de la invención y ventajasExplanation of the invention and advantages

Partiendo de una banda de material termoplástico doblada por su eje central conformando un par de láminas superpuestas, el método de la invención simplifica la confección de los dobladillos internos de una bolsa de plástico al comprender solo dos etapas.Starting from a strip of thermoplastic material folded along its central axis forming a pair of superimposed sheets, the method of the invention simplifies the making of the internal hems of a plastic bag by comprising only two steps.

En la primera etapa, se interviene a la vez sobre las dos láminas de la banda de material termoplástico.In the first stage, the two sheets of the thermoplastic material strip are intervened at the same time.

Se practica un doblez a lo largo del borde longitudinal de la primera lámina con una anchura mayor al de la cinta de cierre y transporte, y a la vez se practica un plegado en "S” a lo largo del borde longitudinal de la segunda lámina, en el cual, el tramo superior presenta un ancho igual al del doblez practicado en el borde longitudinal de la primera lámina, mientras que el tramo medio presenta un ancho igual o ligeramente mayor al del tramo superior.A fold is made along the longitudinal edge of the first sheet with a width greater than that of the closure and transport tape, and at the same time an "S" fold is made along of the longitudinal edge of the second sheet, in which the upper section has a width equal to that of the fold made on the longitudinal edge of the first sheet, while the middle section has a width equal to or slightly greater than that of the upper section.

La superficie de las láminas no afectada por los dobleces permanece en contacto, por lo que no existe posibilidad de entrada de aire.The surface of the sheets not affected by the bends remains in contact, so there is no possibility of air entry.

En la segunda etapa se deshace el tramo medio del plegado en "S” abatiéndolo sobre el borde doblado de la lámina contraria.In the second stage, the middle section of the "S" fold is undone by folding it over the folded edge of the opposite sheet.

La primera etapa del método se lleva a cabo mediante el dispositivo de plegado también objeto de la invención que comprende un conjunto de cinco placas entre las cuales se desplazan los bordes longitudinales de las dos láminas de la banda de material termoplástico sin afectar al resto de la banda, de manera que en un solo paso quedan conformados el dobladillo de la lámina inferior en su posición operativa y el dobladillo de la lámina superior en posición invertida.The first stage of the method is carried out by means of the folding device, also object of the invention, which comprises a set of five plates between which the longitudinal edges of the two sheets of the thermoplastic material strip move without affecting the rest of the band, so that in a single step the hem of the lower sheet is formed in its operative position and the hem of the upper sheet in an inverted position.

La segunda etapa se lleva a cabo mediante un dispositivo de plegado convencional que solo afecta a una lámina de la banda de material y en la misma se reposiciona el dobladillo realizado en la etapa previa para colocarlo en posición operativa enfrentado al dobladillo de la lámina contraria.The second stage is carried out by means of a conventional folding device that only affects one sheet of the material web and in it the hem made in the previous stage is repositioned to place it in an operative position facing the opposite sheet hem.

Otro aspecto de la invención se refiere a un dispositivo para efectuar los dobladillos de una bolsa de plástico dotada de tiras para cierre y transporte realizada según el método de la invención.Another aspect of the invention relates to a device for hemming a plastic bag provided with strips for closure and transport made according to the method of the invention.

El nuevo dispositivo comporta cinco elementos mediante los cuales se practica en un solo paso, un doblez a lo largo del borde longitudinal de la primera lámina y un plegado en "S” a lo largo del borde longitudinal de la segunda lámina de la banda de material termoplástico.The new device includes five elements by means of which it is performed in a single step, a fold along the longitudinal edge of the first sheet and an "S" fold along the longitudinal edge of the second sheet of the material band. thermoplastic.

De estos cinco elementos, dos actúan sobre la primera lámina y los tres restantes sobre la segunda.Of these five elements, two act on the first sheet and the remaining three on the second.

El dispositivo comporta dos placas patín paralelas, de las cuales, una actúa sobre la primera lámina y otra sobre la segunda.The device has two parallel skid plates, of which one acts on the first sheet and the other on the second.

Ambas placas patín presentan un tramo de entrada y un tramo de salida contenidos en diferentes planos inclinados . Both skid plates have an inlet section and an outlet section contained in different inclined planes.

En cada caso, el tramo de entrada presenta una arista lateral inclinada en dirección al eje longitudinal de la pieza, por la que la lámina rodea la placa patín pasando de un lado a otro. In each case, the input section has a lateral edge inclined in the direction of the longitudinal axis of the piece, through which the sheet surrounds the skid plate, passing from one side to the other.

El tramo de entrada de la placa patín de la segunda lámina está adelantado respecto al tramo de entrada de la placa patín de la primera lámina, de manera que el borde longitudinal de la segunda lámina comienza a girar antes que el de la primera. Así, el paso de un lado a otro de la placa se realiza progresivamente.The entry section of the skid plate of the second sheet is ahead of the entry section of the skid plate of the first sheet, so that the longitudinal edge of the second sheet begins to rotate before that of the first sheet. Thus, the passage from one side of the plate to the other is carried out progressively.

El tramo de salida de la placa patín asociado a la primera lámina presenta una placa pisadora, con una arista lateral inclinada en dirección al eje, que completa el giro del borde longitudinal de la primera lámina, de forma que a la salida ya se ha conformado el dobladillo de la primera lámina en posición de uso.The outlet section of the skid plate associated with the first sheet has a treading plate, with a lateral edge inclined in the direction of the axis, which completes the rotation of the longitudinal edge of the first sheet, so that at the exit it has already been formed the hem of the first sheet in use position.

El tramo de salida de la placa patín asociado a la segunda lámina comporta una placa pisadora intermedia. La placa pisadora intermedia presenta una arista lateral inclinada en dirección al eje longitudinal de la banda, que genera el tramo medio del plegado en "S”. También incorpora un patín vertical alineado con la arista inclinada, que conduce el borde longitudinal de la segunda lámina hacia una placa pisadora final. La placa pisadora final presenta una arista lateral inclinada en dirección al eje longitudinal de la banda, la cual completa el giro del borde longitudinal de la segunda lámina para generar el tramo superior del plegado en "S”, de manera que a la salida se ha conformado el dobladillo de la segunda lámina en posición invertida.The outlet section of the skid plate associated with the second sheet includes an intermediate tread plate. The intermediate pressing plate has a lateral edge inclined in the direction of the longitudinal axis of the strip, which generates the middle section of the "S" fold. It also incorporates a vertical skate aligned with the inclined edge, which leads the longitudinal edge of the second sheet. towards a final pressing plate. The final pressing plate has an inclined lateral edge in the direction of the longitudinal axis of the strip, which completes the rotation of the longitudinal edge of the second sheet to generate the upper section of the "S" fold, so that at the exit the hem of the second sheet has been formed in an inverted position.

Dibujos y referenciasDrawings and references

Con el objeto de ilustrar cuanto hasta ahora hemos expuesto, se acompaña a la presente memoria descriptiva de unos dibujos en la que se ha representado un ejemplo de realización únicamente ilustrativo y no limitativo de las posibilidades prácticas de la invención.In order to illustrate what we have discussed so far, the present specification is accompanied by some drawings in which an exemplary embodiment which is only illustrative and not limiting of the practical possibilities of the invention has been represented.

La figura 1 representa un diagrama de los movimientos de la banda de material termoplástico en la primera etapa del método.Figure 1 represents a diagram of the movements of the thermoplastic material strip in the first stage of the method.

La figura 2 representa un diagrama de los movimientos de la banda de material termoplástico en la segunda etapa del método.Figure 2 represents a diagram of the movements of the thermoplastic material strip in the second stage of the method.

La figura 3 representa una sucesión de vistas de la banda de material termoplástico en el estado de partida, tras la primera etapa del método y tras la segunda etapa del método. Figure 3 represents a succession of views of the strip of thermoplastic material in the initial state, after the first stage of the method and after the second stage of the method.

La figura 4 representa una vista en perspectiva de los cambios efectuados en la segunda lámina durante la primera etapa del método de la invención.Figure 4 represents a perspective view of the changes made in the second sheet during the first stage of the method of the invention.

La figura 5 representa una vista en perspectiva de los cambios efectuados en la primera lámina durante la primera etapa del método de la invención.Figure 5 represents a perspective view of the changes made in the first sheet during the first stage of the method of the invention.

La figura 6 representa una vista explotada del dispositivo de la invención.Figure 6 represents an exploded view of the device of the invention.

La figura 7 representa una vista en perspectiva con líneas ocultas del dispositivo con el tramo de entrada en primer plano.Figure 7 represents a perspective view with hidden lines of the device with the inlet section in the foreground.

La figura 8 representa una vista en perspectiva con líneas ocultas del dispositivo con el tramo de salida en primer plano.Figure 8 represents a perspective view with hidden lines of the device with the outlet section in the foreground.

La figura 9 representa una vista frontal del tramo de entrada del dispositivo de la invención en la que se aprecia el desarrollo de la banda de material termoplástico.Figure 9 represents a front view of the inlet section of the device of the invention in which the development of the thermoplastic material strip can be seen.

La figura 10 representa una vista en perspectiva del dispositivo de la invención con el tramo de entrada en primer plano y en el que se aprecia el desarrollo de la banda de material termoplástico por el mismo.Figure 10 represents a perspective view of the device of the invention with the inlet section in the foreground and in which the development of the strip of thermoplastic material can be seen through it.

La figura 11 representa una vista frontal del tramo de salida del dispositivo de la invención en la que se aprecia el desarrollo de la banda de material termoplástico.Figure 11 represents a front view of the outlet section of the device of the invention in which the development of the thermoplastic material strip can be seen.

La figura 12 representa una vista en perspectiva del dispositivo de la invención con el tramo de salida en primer plano y en el que se aprecia el desarrollo de la banda de material termoplástico por el mismo.Figure 12 represents a perspective view of the device of the invention with the outlet section in the foreground and in which the development of the thermoplastic material band is seen through it.

La figura 13 representa una vista de la placa patín de la segunda lámina.Figure 13 represents a view of the skid plate of the second sheet.

La figura 14 representa una vista de la placa patín de la primera lámina.Figure 14 represents a view of the skid plate of the first sheet.

La figura 15 representa una vista de la placa pisadora final.Figure 15 represents a view of the final tread plate.

La figura 16 representa una vista de la placa pisadora intermedia.Figure 16 represents a view of the intermediate pressing plate.

La figura 17 representa una vista de la placa pisadora.Figure 17 represents a view of the tread plate.

En estas figuras están indicadas las siguientes referencias:The following references are indicated in these figures:

1- Banda de material termoplástico 1- Strip of thermoplastic material

- Eje central- Central axis

- Primera lámina- First sheet

- Segunda lámina- Second sheet

- Doblez- Fold

- Borde longitudinal- Longitudinal edge

- Plegado en "S”- Fold in "S"

- Borde longitudinal- Longitudinal edge

- Tramo superior- Upper section

0- Tramo medio0- Middle section

1- Primer dobladillo1- First hem

2- Segundo dobladillo2- Second hem

3- Placa patín3- Skate plate

4- Placa patín4- Skate plate

5- Tramo de entrada5- Entrance section

6- Tramo de salida6- Exit section

7- Arista lateral inclinada 8- Placa pisadora7- Inclined lateral edge 8- Tread plate

9- Arista lateral inclinada 0- Placa pisadora intermedia 1- Arista lateral inclinada 2- Patín vertical9- Inclined lateral edge 0- Intermediate pressing plate 1- Inclined lateral edge 2- Vertical skid

3- Placa pisadora final 24-Arista lateral inclinada3- Final tread plate 24-Inclined lateral edge

Exposición de una realización preferentePresentation of a preferred embodiment

El presente método para realizar los dobladillos internos en una bolsa de plástico, parte de una banda de material termoplástico (1) doblada por su eje central (2) conformando una primera lamina (3) y una segunda lámina (4) superpuestas y en contacto total. Este método comprende dos etapas diferenciadas.The present method to make the internal hems in a plastic bag, starts with a strip of thermoplastic material (1) folded by its central axis (2) forming a first sheet (3) and a second sheet (4) superimposed and in contact total. This method comprises two different stages.

En una primera etapa se practica un doblez (5) a lo largo del borde longitudinal (6) de la primera lámina (3) con una anchura "A” mayor al de la cinta de cierre y transporte a contener. Este doblez (5) origina el primer dobladillo (11). A la vez se practica un plegado en "S” (7) a lo largo del borde longitudinal (8) de la segunda lámina (4), en el cual, el tramo superior (9) presenta un ancho "A” igual al del doblez (5), mientras que el tramo medio (10) presenta un ancho "B” ligeramente mayor al del tramo superior (9).In a first stage, a fold (5) is made along the longitudinal edge (6) of the first sheet (3) with a width "A" greater than that of the closure and transport tape to contain. This fold (5) originates the first hem (11). At the same time an "S" fold (7) is made along the longitudinal edge (8) of the second sheet (4), in which the upper section (9) presents a width "A" equal to that of the fold (5), while the middle section (10) has a width "B" slightly greater than that of the upper section (9).

El plegado en "S” (7) da origen al segundo dobladillo (12) el cual al completarse la primera etapa se halla en posición invertida.The "S" fold (7) gives rise to the second hem (12) which upon completion of the first stage is in an inverted position.

En la segunda etapa se deshace el tramo medio (10) del plegado en "S” (7) abatiéndolo sobre la primera lámina (3) como se muestra en la figura 2.In the second stage, the middle section (10) of the "S" fold (7) is undone by folding it over the first sheet (3) as shown in figure 2.

Otro aspecto de la invención se refiere a un dispositivo para efectuar los dobladillos de una bolsa de plástico realizada según el método de la invención descrita que comporta cinco elementos mediante los cuales se practica en un solo paso, un doblez (5) a lo largo del borde longitudinal (6) de la primera lámina (3) y un plegado en "S” (7) a lo largo del borde longitudinal (8) de la segunda lámina (4).Another aspect of the invention refers to a device for hemming a plastic bag made according to the method of the invention described, comprising five elements by means of which a fold (5) is made in a single step, along the longitudinal edge (6) of the first sheet (3) and an "S" fold (7) along the longitudinal edge (8) of the second sheet (4).

El dispositivo comporta una placa patín (13) que actúa sobre la primera lámina (3) y una placa patín (14) que actúa sobre la segunda lámina (4) dispuestas en paralelo y que presentan un tramo de entrada (15) y un tramo de salida (16) contenidos en diferentes planos se hallan inclinados un ángulo "C” que en el ejemplo representado es de 135°.The device comprises a skid plate (13) that acts on the first sheet (3) and a skid plate (14) that acts on the second sheet (4) arranged in parallel and that have an inlet section (15) and a section outlet (16) contained in different planes are inclined by an angle "C" which in the example shown is 135 °.

Cada tramo de entrada (15) presenta una arista lateral inclinada (17) por la que la lámina rodea la placa patín pasando de un lado a otro de esta.Each inlet section (15) has an inclined lateral edge (17) through which the sheet surrounds the skid plate, passing from one side of it to the other.

El tramo de entrada (15) de la placa patín (14) está adelantado respecto al tramo de entrada (15) de la placa patín (13) de manera que la segunda lamina (4) comienza a girar antes que la primera lámina (3). The entry section (15) of the skid plate (14) is advanced with respect to the entry section (15) of the skid plate (13) so that the second sheet (4) begins to rotate before the first sheet (3 ).

El tramo de salida (16) de la placa patín (13) presenta una placa pisadora (18) con una arista lateral inclinada (19) que completa el giro del borde longitudinal (6) de la primera lámina (3), conformando el primer dobladillo (11) en posición de uso.The outlet section (16) of the skid plate (13) has a tread plate (18) with an inclined lateral edge (19) that completes the rotation of the longitudinal edge (6) of the first sheet (3), forming the first hem (11) in use position.

El tramo de salida (16) de la placa patín (14) presenta una placa pisadora intermedia (20), con una arista lateral inclinada (21) que genera el tramo medio (10) del plegado en "S” (7), y con un patín vertical (22) alineado con la arista lateral inclinada (21), que conduce el borde longitudinal (8) de la segunda lámina (4) hacia una placa pisadora final (23) que comporta una arista lateral inclinada (24), la cual completa el giro del borde longitudinal (8) para generar el tramo superior (9) de plegado en "S” (7) generando el segundo dobladillo (12) en posición invertida. The outlet section (16) of the skid plate (14) has an intermediate tread plate (20), with an inclined side edge (21) that generates the middle section (10) of the "S" fold (7), and with a vertical skid (22) aligned with the inclined lateral edge (21), which leads the longitudinal edge (8) of the second sheet (4) towards a final tread plate (23) that includes an inclined lateral edge (24), which completes the rotation of the longitudinal edge (8) to generate the upper section (9) of the "S" fold (7) generating the second hem (12) in an inverted position.

Claims (8)

REIVINDICACIONES 1. - Método para realizar los dobladillos internos en una bolsa de plástico que parte de una banda de material termoplástico (1) doblada por su eje central (2) conformando una primera lamina (3) y una segunda lámina (4) superpuestas y en contacto total entre ellas, caracterizado porque comprende:1. - Method to make the internal hems in a plastic bag that starts from a strip of thermoplastic material (1) folded by its central axis (2) forming a first sheet (3) and a second sheet (4) superimposed and in total contact between them, characterized in that it comprises: • Una primera etapa en la que se practica simultáneamente un doblez (5) a lo largo del borde longitudinal (6) de la primera lámina (3) con una anchura "A” mayor al de la cinta de cierre y transporte a contener, que origina el primer dobladillo (11), y un plegado en "S” (7) a lo largo del borde longitudinal (8) de la segunda lámina (4), en el cual, el tramo superior (9) presenta un ancho "A” igual al del doblez (5), mientras que el tramo medio (10) presenta un ancho "B” igual o ligeramente mayor al ancho "A” del tramo superior (9), de manera que el plegado en "S” (7) origina el segundo dobladillo (12).• A first stage in which a fold (5) is simultaneously made along the longitudinal edge (6) of the first sheet (3) with a width "A" greater than that of the closure and transport tape to contain, which originates the first hem (11), and an "S" fold (7) along the longitudinal edge (8) of the second sheet (4), in which the upper section (9) has a width "A ”Equal to that of the fold (5), while the middle section (10) has a width" B "equal to or slightly greater than the width" A "of the upper section (9), so that the" S "fold (7 ) forms the second hem (12). • Una segunda etapa en la que se deshace el tramo medio (10) del plegado en "S” (7) realizado en la segunda lámina (4) abatiéndolo sobre la primera lámina (3) y enfrentado el segundo dobladillo (12) al primer dobladillo (11).• A second stage in which the middle section (10) of the "S" fold (7) made in the second sheet (4) is undone by folding it over the first sheet (3) and facing the second hem (12) to the first hem (11). 2. - Dispositivo para efectuar los dobladillos de una bolsa de plástico según el método de la invención caracterizado porque comporta una placa patín (13) que actúa sobre la primera lámina (3) y una placa patín (14) que actúa sobre la segunda lámina (4) dispuestas en paralelo y que presentan en ambos casos un tramo de entrada (15) y un tramo de salida (16) contenidos en diferentes planos inclinados un ángulo "C”.2. - Device to hem a plastic bag according to the method of the invention characterized in that it includes a skid plate (13) that acts on the first sheet (3) and a skid plate (14) that acts on the second sheet (4) arranged in parallel and presenting in both cases an inlet section (15) and an outlet section (16) contained in different inclined planes at an angle "C". 3. - Dispositivo para efectuar los dobladillos de una bolsa de plástico según reivindicación 2 caracterizada porque cada tramo de entrada (15) presenta una arista lateral inclinada (17) en dirección al eje longitudinal de la pieza, por la que la lámina rodea la placa patín pasando de un lado a otro de esta.3. - Device for making the hems of a plastic bag according to claim 2 characterized in that each entry section (15) has an inclined lateral edge (17) in the direction of the longitudinal axis of the piece, by which the sheet surrounds the plate skate going from one side of this to the other. 4. - Dispositivo para efectuar los dobladillos de una bolsa de plástico según reivindicación 2 y 3 caracterizado porque el tramo de entrada (15) de la placa patín (14) está adelantado respecto al tramo de entrada (15) de la placa patín (13).4. - Device to hem a plastic bag according to claims 2 and 3, characterized in that the entry section (15) of the skid plate (14) is ahead of the entry section (15) of the skid plate (13 ). 5. - Dispositivo para efectuar los dobladillos de una bolsa de plástico según reivindicación 2 caracterizado porque el tramo de salida (16) de la placa patín (13) presenta una placa pisadora (18), con una arista lateral inclinada (19), que completa el giro del borde longitudinal (6) de la primera lámina (3) sobre la placa patín (13) para formar el primer dobladillo (11). 5. - Device for making the hems of a plastic bag according to claim 2 characterized in that the outlet section (16) of the skid plate (13) has a treading plate (18), with an inclined side edge (19), which completes the rotation of the longitudinal edge (6) of the first sheet (3) on the skid plate (13) to form the first hem (11). 6. - Dispositivo para efectuar los dobladillos de una bolsa de plástico según reivindicación 2 caracterizado porque el tramo de salida (16) de la placa patín (14) presenta una placa pisadora intermedia (20), con una arista lateral inclinada (21), que genera el tramo medio (10) del plegado en "S” (7) al completar el giro del borde longitudinal (8) de la segunda lámina (4) sobre la placa patín (14).6. - Device for making the hems of a plastic bag according to claim 2, characterized in that the outlet section (16) of the skid plate (14) has an intermediate treading plate (20), with an inclined side edge (21), generated by the middle section (10) of the "S" fold (7) upon completing the rotation of the longitudinal edge (8) of the second sheet (4) on the skid plate (14). 7. - Dispositivo para efectuar los dobladillos de una bolsa de plástico según reivindicación 6 caracterizado porque la placa pisadora intermedia (20) comporta un patín vertical (22) alineado con la arista lateral inclinada (21), que conduce del borde longitudinal (8) de la segunda lámina (4) hacia una placa pisadora final (23).7. - Device for making the hems of a plastic bag according to claim 6 characterized in that the intermediate tread plate (20) includes a vertical skid (22) aligned with the inclined side edge (21), which leads from the longitudinal edge (8) from the second sheet (4) towards a final tread plate (23). 8.- Dispositivo para efectuar los dobladillos de una bolsa de plástico según reivindicación 7 caracterizado porque la placa pisadora final (23) comporta una arista lateral inclinada (24), que completa el giro del borde longitudinal (8) sobre la placa pisadora intermedia (20) para generar el tramo superior (9) de plegado en "S” (7) que junto al tramo medio (10) conforma el segundo dobladillo (12). 8. Device to hem a plastic bag according to claim 7, characterized in that the end plate (23) has an inclined side edge (24), which completes the rotation of the longitudinal edge (8) on the intermediate plate ( 20) to generate the upper section (9) of folding in "S" (7) that together with the middle section (10) forms the second hem (12).
ES202030548A 2020-06-08 2020-06-08 Method for internal hemming of a plastic bag and device for carrying out this method Active ES2800098B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
ES202030548A ES2800098B2 (en) 2020-06-08 2020-06-08 Method for internal hemming of a plastic bag and device for carrying out this method
FR2105809A FR3111093A1 (en) 2020-06-08 2021-06-02 Method for making inner hems in a plastic bag and device for carrying out this method
TR2021/009232A TR2021009232A2 (en) 2020-06-08 2021-06-04 A method of crimping the inner edges of a plastic bag and a device for performing this method.
DE102021114473.6A DE102021114473A1 (en) 2020-06-08 2021-06-05 METHOD FOR MANUFACTURING INTERIOR HEMS IN A PLASTIC BAG AND DEVICE FOR CARRYING OUT THIS METHOD
PL438083A PL438083A1 (en) 2020-06-08 2021-06-07 Method of making inner edges in a plastic bag and a device for carrying out this method

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ES202030548A ES2800098B2 (en) 2020-06-08 2020-06-08 Method for internal hemming of a plastic bag and device for carrying out this method

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ES2800098B2 ES2800098B2 (en) 2021-05-11

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ES (1) ES2800098B2 (en)
FR (1) FR3111093A1 (en)
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3406610A (en) * 1965-08-17 1968-10-22 Bertie C. Golden Plastic drawstring bag machine
US5057065A (en) * 1989-12-08 1991-10-15 Reynolds Metals Company Process for making draw tape bags with integrally formed draw tapes
WO2010086794A1 (en) * 2009-01-29 2010-08-05 Lohia Starlinger Limited A device and a method for making a double fold
EP3393782B1 (en) * 2015-12-22 2020-02-05 Roll-o-Matic A/S Method and apparatus for making draw strip bags

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3406610A (en) * 1965-08-17 1968-10-22 Bertie C. Golden Plastic drawstring bag machine
US5057065A (en) * 1989-12-08 1991-10-15 Reynolds Metals Company Process for making draw tape bags with integrally formed draw tapes
WO2010086794A1 (en) * 2009-01-29 2010-08-05 Lohia Starlinger Limited A device and a method for making a double fold
EP3393782B1 (en) * 2015-12-22 2020-02-05 Roll-o-Matic A/S Method and apparatus for making draw strip bags

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FR3111093A1 (en) 2021-12-10
ES2800098B2 (en) 2021-05-11
TR2021009232A2 (en) 2021-12-21
PL438083A1 (en) 2021-12-13
DE102021114473A1 (en) 2021-12-09

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