ES2208106B1

ES2208106B1 - MACHINE FOR THE MANUFACTURE OF TUBULAR BODIES.

Info

Publication number: ES2208106B1
Application number: ES200202498A
Authority: ES
Inventors: Jesus Sanchez Reñasco
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-10-30
Filing date: 2002-10-30
Publication date: 2005-10-01
Anticipated expiration: 2022-10-30
Also published as: ES2208106A1

Abstract

Máquina para la fabricación de cuerpos tubulares. Prevista para utilizar como materia prima una pluralidad de bandas (5) a base de materias primas consistentes en fibras vegetales y/o sintéticas combinadas con polímeros fundentes, destinadas a arrollarse helicoidalmente para configurar el pretendido cuerpo tubular y cilíndrico, incorpora un desbobinador (1) en el que se instalan una pluralidad de bobinas (4), montadas sobre respectivos ejes independientes entre sí, estableciéndose a continuación de dicho desbobinador (1) un túnel de calentamiento (9), asistido por un generador de aire caliente (12), en disposición lateral y oblicua, accediendo dichas bandas (5) a la extremidad anterior de un mandril (10) fijo, tanto en sentido angular como en sentido axial, montado en voladizo sobre un soporte (15), al que dichas bandas (5) acceden tangencial y oblicuamente siendo arrastradas por una correa plana (14) que provoca el deslizamiento de las bandas, parcialmente superpuestas, sobre el mandril (10), el cual está refrigerado para facilitar la rápida soldadura del plástico, y asistido por un impregnador de líquido suavizante para facilitar el deslizamiento del cuerpo tubular obtenido sobre el mandril, cuerpo tubular continuo que se fragmenta mediante un dispositivo de corte situado más allá del extremo de salida de dicho mandril (10).Machine for the manufacture of tubular bodies. Intended to use as a raw material a plurality of bands (5) based on raw materials consisting of vegetable and / or synthetic fibers combined with melting polymers, intended to coil helically to configure the intended tubular and cylindrical body, incorporates a rewinder (1) in which a plurality of coils (4) are installed, mounted on respective axes independent of each other, a heating tunnel (9) being established following said unwinder (9), assisted by a hot air generator (12), in lateral and oblique arrangement, said bands (5) accessing the front end of a fixed mandrel (10), both angularly and axially, mounted cantilever on a support (15), which said bands (5) access tangentially and obliquely being dragged by a flat belt (14) that causes the bands, partially superimposed, to slide over the mandrel (10), which is cooled to fa cylindrical the rapid welding of the plastic, and assisted by an impregnator of softening liquid to facilitate the sliding of the tubular body obtained on the mandrel, continuous tubular body that is fragmented by a cutting device located beyond the outlet end of said mandrel (10 ).

Description

Máquina para la fabricación de cuerpos tubulares.Machine for manufacturing bodies tubular

Object of the invention

La presente invención se refiere a una máquina que ha sido especialmente concebida para la fabricación de cuerpos tubulares, concretamente de cuerpos cilíndricos, utilizables como envases de diferentes tipos de productos, en forma granular, pulverulenta o pastosa, así como también utilizables como elementos de encofrado, en el ámbito de la construcción, para la obtención de columnas cilíndricas, etc.The present invention relates to a machine which has been specially designed for the manufacture of bodies tubular, specifically cylindrical bodies, usable as containers of different types of products, in granular form, powdery or pasty, as well as usable as elements formwork, in the field of construction, to obtain cylindrical columns, etc.

La máquina utiliza como materia prima varias láminas o bandas continuas, que combinan materias primas a base de fibras vegetales y/o sintéticas, combinadas con polímeros fundentes, agrupándolas en un complejo o banda única que, enrollada helicoidalmente y termosoldada, da lugar al cuerpo tubular y cilíndrico perseguido.The machine uses several raw materials continuous sheets or bands, which combine raw materials based on vegetable and / or synthetic fibers, combined with polymers fluxes, grouping them into a complex or single band that, rolled up helically and heat-welded, it gives rise to the tubular body and cylindrical pursued.

Background of the invention

La propia entidad solicitante es titular de la patente de invención española con número de solicitud P8803814, en la que se describe un procedimiento para la fabricación de envases tubulares y piezas de geometría plana.The requesting entity itself owns the Spanish invention patent with application number P8803814, in which describes a procedure for the manufacture of packaging Tubular and flat geometry pieces.

En dicha patente se da por conocida la existencia de envases y piezas obtenidas a base de varias láminas o capas a base de materiales fibrosos o no, tales como papeles y cartones o fibra kraft, en número variable en función del grosor que se desee conferir a las paredes del envase o pieza a obtener, siendo dichas láminas unidas entre sí mediante pegamentos o productos adhesivos hasta formar un cuerpo que, en el caso específico de envases tubulares, se somete a un arrollamiento en espiral, mientras que en el caso de una pieza de geometría plana se remata mediante corte y troquelado.In said patent the existence is considered known of containers and pieces obtained based on several sheets or layers to base of fibrous materials or not, such as paper and cardboard or Kraft fiber, in variable number depending on the desired thickness confer to the walls of the container or piece to be obtained, said sheets joined together by glue or adhesive products to form a body that, in the specific case of packaging tubular, it undergoes a spiral winding, while in the case of a piece of flat geometry is finished off by cutting and die cut

En dicha patente de invención, para eliminar los problemas inherentes a la utilización de adhesivos, se preveía la combinación de las láminas de papel o similar anteriormente citadas con láminas plásticas, de manera que la definitiva fijación entre capas del envase o pieza plana se conseguía mediante termosoldadura del material plástico.In said invention patent, to eliminate problems inherent to the use of adhesives, the combination of the paper sheets or similar mentioned above with plastic sheets, so that the definitive fix between layers of the container or flat piece was achieved by heat welding of plastic material.

Obviamente el término "envases tubulares", engloba tanto a cualquier tipo de envase propiamente dicho obtenido a base de este tipo de material, como a los cuerpos tubulares y cilíndricos utilizados como encofrado para la obtención de columnas asimismo cilíndricas, o cualquier otro supuesto práctico en el que se requiera de un cuerpo de estas características.Obviously the term "tubular containers", It encompasses both any type of container itself obtained based on this type of material, such as tubular bodies and cylindrical used as formwork to obtain columns also cylindrical, or any other practical assumption in which a body of these characteristics is required.

Description of the invention

La máquina que la invención propone ha sido especialmente concebida para obtener cuerpos tubulares cilíndricos, utilizando el procedimiento de la citada patente de invención, utilizando concretamente materias primas a base de fibras vegetales y/o sintéticas combinadas con polímeros fundentes, configurando una banda o complejo, que puede incorporar también en su seno una lámina de aluminio.The machine that the invention proposes has been specially designed to obtain cylindrical tubular bodies, using the method of said invention patent, specifically using raw materials based on vegetable fibers and / or synthetics combined with melting polymers, configuring a band or complex, which can also incorporate a aluminum foil.

De forma más concreta dicha máquina está estructurada a partir de un mandril cilíndrico fijo, es decir inmovilizado tanto en sentido rotatorio como en sentido axial, de diámetro acorde con el del cuerpo tubular a obtener, hueco y dotado de medios de refrigeración, cuya finalidad será descrita más adelante.More specifically said machine is structured from a fixed cylindrical mandrel, that is immobilized both rotationally and axially, of diameter according to that of the tubular body to be obtained, hollow and endowed of cooling means, whose purpose will be described more ahead.

Dicho mandril está destinado a recibir simultáneamente en disposición oblicua y desfasadas longitudinalmente, a una pluralidad de bandas que se superponen parcialmente sobre el mismo, bandas suministradas desde respectivas bobinas montadas independientemente en un desbobinador y que acceden al mandril previo paso por un túnel de calentamiento, asistido por un generador de aire caliente, que ataca lateral y oblicuamente a dicho túnel en la zona inicial del mismo y que provoca un calentamiento de las bandas adecuado para que el material plástico que participa en las mismas se reblandezca y adopte unas condiciones de adhesión térmica en la superposición entre capas, produciéndose la definitiva adhesión de forma prácticamente inmediata merced al sistema de refrigeración de que está previsto el mandril.Said mandrel is intended to receive simultaneously in oblique arrangement and outdated longitudinally, to a plurality of bands that overlap partially on it, bands supplied from respective coils mounted independently on a rewinder and that they access the mandrel after passing through a heating tunnel, assisted by a hot air generator, which attacks lateral and obliquely to said tunnel in its initial zone and that causes adequate heating of the bands so that the plastic material that participates in them will soften and adopt thermal adhesion conditions in the overlay between layers, producing the definitive adhesion of form virtually immediately thanks to the cooling system that the mandrel is provided.

La tracción sobre las bandas es producida por un dispositivo arrastrador, a base de una correa plana que actúa sobre toda la periferia del mandril, con interposición del haz de bandas adaptado a este último, provocando un arrastre de las bandas, con simultáneo deslizamiento de las mismas sobre el mandril, que por la inclinación de dichas bandas da lugar al arrollamiento helicoidal de las mismas sobre el mandril, con simultáneo desplazamiento longitudinal a lo largo del mismo, del tubo que se va obteniendo.The traction on the bands is produced by a dragging device, based on a flat belt that acts on the entire periphery of the mandrel, with interposition of the band bundle adapted to the latter, causing a drag of the bands, with simultaneous sliding of the same on the mandrel, than by the inclination of said bands results in helical winding of them on the mandrel, with simultaneous displacement longitudinal along it, of the tube that goes getting.

El mandril está montado en voladizo sobre una estructura soporte a partir de su extremo correspondiente a la entrada de las bandas, de manera que el cuerpo tubular obtenido sale libremente por la otra extremidad del mandril, donde un dispositivo de corte lo fragmentará en tramos de longitud predeterminada.The mandrel is cantilever mounted on a support structure from its end corresponding to the entrance of the bands, so that the tubular body obtained leaves freely on the other end of the mandrel, where a device cutting will fragment it into sections of predetermined length.

La no adherencia del material plástico que participa en las bandas, generalmente polímero, al mandril, viene asegurada por la refrigeración de dicho mandril, y para facilitar el deslizamiento de las bandas sobre el mandril se ha previsto la aportación al mismo, en la zona de recepción de las bandas, de un líquido suavizante, que actúa como lubricante entre la superficie de las bandas y la superficie del mandril.The non-adhesion of the plastic material that participates in the bands, usually polymer, to the mandrel, comes assured by the cooling of said mandrel, and to facilitate the sliding of the bands on the mandrel is provided the contribution to it, in the reception area of the bands, of a softening liquid, which acts as a lubricant between the surface of the bands and the surface of the mandrel.

No obstante la no adherencia del material constitutivo del cuerpo tubular al mandril puede conseguirse por otros medios, concretamente los siguientes:Notwithstanding the non-adhesion of the material constitutive of the tubular body to the mandrel can be achieved by other means, specifically the following:

--: Enfriamiento del mandril hasta el nivel de escarcha.Cooling the mandrel to the level of frost.

--: Establecimiento de un colchón de aire envolvente del mandril, mediante toberas inclinadas en el sentido de arrollamiento de las bandas.Establishment of an air mattress casing of the mandrel, by means of nozzles inclined in the direction of winding of the bands.

--: Tratamiento del mandril con teflón-3.Mandrel treatment with Teflon-3.

--: Aportación, simultáneamente a las diferentes bandas constitutivas del cuerpo tubular, de una banda auxiliar de silicona que constituye el medio de apoyo y deslizamiento sobre el mandrilContribution, simultaneously at different bands constituting the tubular body, of a band silicone auxiliary that constitutes the support medium and sliding on the mandrel

Las bandas son suministradas independientemente desde un desbobinador de alimentación, en el que cada bobina está montada sobre su propio eje, con giro independiente de las demás, para que manteniendo sensiblemente uniforme su desplazamiento lineal puedan tener diferentes velocidades angulares, en función de distintos diámetros de las bobinas utilizadas, estando además cada bobina asistida por una bobina auxiliar que permite reponer de forma sumamente rápida la alimentación de la máquina al consumirse la primera bobina. La independencia física entre los ejes de las diferentes bobinas, permite a su vez absorber las diferencias en la velocidad lineal de las respectivas bandas, generadas por su distinto nivel en el arrollamiento de las mismas sobre el mandril.Bands are supplied independently from a feed unwinder, in which each coil is mounted on its own axis, with independent rotation of the others, so that keeping its movement substantially uniform linear can have different angular speeds, depending on different diameters of the coils used, each being also coil assisted by an auxiliary coil that allows replenishment of extremely fast feeding the machine when consumed The first coil. The physical independence between the axes of the different coils, allows in turn to absorb differences in the linear speed of the respective bands, generated by their different level in the winding of them on the mandrel

Description of the drawings

Para complementar la descripción que se está realizando y con objeto de ayudar a una mejor comprensión de las características del invento, de acuerdo con un ejemplo preferente de realización práctica del mismo, se acompaña como parte integrante de dicha descripción, un juego de dibujos en donde con carácter ilustrativo y no limitativo, se ha representado lo siguiente:To complement the description that is being performing and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical realization of it, is accompanied as part member of that description, a set of drawings where with illustrative and non-limiting nature, what has been represented next:

La figura 1.- Muestra una representación esquemática en planta de la máquina para la fabricación de cuerpos tubulares que constituye el objeto de la presente invención, en su conjunto.Figure 1.- Shows a representation plant schematic of the machine for manufacturing bodies tubular which constitutes the object of the present invention, in its set.

La figura 2.- Muestra un detalle en perspectiva del desbobinador.Figure 2.- Shows a detail in perspective of the unwinder.

La figura 3.- Muestra, también según una vista en perspectiva, un detalle parcial del túnel de calentamiento, observándose en la misma el acceso de las bandas al interior del mismo.Figure 3.- Shows, also according to a view in perspective, a partial detail of the heating tunnel, observing in it the access of the bands inside the same.

La figura 4.- Muestra otra vista en perspectiva del túnel de calentamiento, por su lateral opuesto al de la figura anterior.Figure 4.- Shows another perspective view of the heating tunnel, on its side opposite that of the figure previous.

La figura 5.- Muestra una perspectiva parcial y superior del extremo del mandril a través del que acceden al mismo las diferentes bandas y sobre el que actúa el dispositivo arrastrador.Figure 5.- Shows a partial perspective and upper end of the mandrel through which they access it the different bands and on which the device acts drag

La figura 6.- Muestra una perspectiva lateral de la misma zona del mandril, en la que se observa la superposición parcial entre bandas.Figure 6.- Shows a lateral perspective of the same area of the mandrel, in which the overlap is observed partial between bands.

La figura 7.- Muestra, finalmente, un detalle en perspectiva del citado dispositivo arrastrador de las bandas.Figure 7.- Shows, finally, a detail in perspective of the aforementioned band dragging device.

Preferred Embodiment of the Invention

A la vista de las figuras reseñadas puede observarse como en la máquina que se preconiza participa un desbobinador (1), representado en detalle en la figura 2, en el que sobre un bastidor soporte (2) se establecen una pluralidad de ejes (3), independientes entre sí, destinados a recibir a respectivas bobinas (4) suministradoras de sendas bandas continuas (5) del papel estratificado y plastificado a que se ha hecho mención con anterioridad, contando cada bobina principal (4) con al menos una bobina auxiliar (6) destinada a permanecer en reserva para eliminar el tiempo muerto de la máquina cuando se produce el agotamiento de la bobina principal (4), momento en el que al extremo terminal de la banda (5) se fija, por ejemplo mediante un adhesivo a dos caras (7), la extremidad inicial de la bobina complementaria (6).In view of the figures outlined you can be observed as in the machine that is recommended participates a unwinder (1), shown in detail in Figure 2, in which a plurality of axes are established on a support frame (2) (3), independent of each other, intended to receive respective coils (4) suppliers of two continuous bands (5) of the laminated and laminated paper referred to with before, counting each main coil (4) with at least one auxiliary coil (6) intended to remain in reserve to eliminate machine downtime when depletion occurs the main coil (4), at which point at the terminal end of the band (5) is fixed, for example by a two-sided adhesive (7), the initial end of the complementary coil (6).

Las diferentes bandas (5) son convenientemente guiadas mediante rodillos (8) o por cualquier otro medio hacia un túnel de calentamiento (9) que desemboca en las proximidades del mandril (10). Dicho túnel (9), provisto de separadores interiores (11) que mantienen debidamente independizadas las bandas (5), está asistido por un generador de aire caliente (12) que ataca lateral y oblicuamente a dicho túnel (9) y que con la colaboración de un ventilador (13) suministra aire a la zona inicial del túnel (9) a una temperatura comprendida entre 160° C y 200° C, de manera que a la salida del túnel (9) se mantiene una temperatura a su vez comprendida entre 140° C y 190° C, adecuada para que el material plástico, concretamente el polietileno, que participa en las bandas (5), se encuentre en condiciones térmicas de adherirse tanto a otra capa de polietileno como a cualquier otra capa del complejo.The different bands (5) are conveniently guided by rollers (8) or by any other means towards a heating tunnel (9) leading to the vicinity of the mandrel (10). Said tunnel (9), provided with interior dividers (11) that keep the bands properly independent (5), is assisted by a hot air generator (12) that attacks lateral and obliquely to said tunnel (9) and that with the collaboration of a fan (13) supplies air to the initial tunnel area (9) a a temperature between 160 ° C and 200 ° C, so that at the tunnel outlet (9) maintains a temperature in turn between 140 ° C and 190 ° C, suitable for the material plastic, specifically polyethylene, which participates in the bands (5), is in a thermal condition to adhere to another polyethylene layer like any other layer of the complex.

Tras salir del túnel (9) las bandas (5) alcanzan oblicuamente al mandril (10), quedando desfasadas en el sentido axial del mandril (10), como se observa especialmente en la figura 6, pero mayoritariamente superpuestas, situándose en este extremo inicial del mandril (10) un dispositivo arrastrador materializado en una correa (14), plana, que actuando exteriormente sobre las bandas (5) y constituyendo el mandril (10) un elemento estático, provoca el deslizamiento de dichas bandas (5) alrededor del mandril (10), con un paralelo desplazamiento axial de las mismas, debido a su propia inclinación, es decir provocando un arrollamiento helicoidal de las bandas sobre el mandril, con paralelo desplazamiento axial de las mismas a lo largo de dicho mandril (10).After leaving the tunnel (9) the bands (5) reach obliquely to the mandrel (10), being offset in the direction axial of the mandrel (10), as seen especially in the figure 6, but mostly overlapping, standing at this end initial of the mandrel (10) a materialized drag device on a belt (14), flat, which acting externally on the bands (5) and constituting the mandrel (10) a static element, causes the sliding of said bands (5) around the mandrel (10), with a parallel axial displacement thereof, due to its own inclination, that is causing a winding helical bands on the mandrel, with parallel axial displacement thereof along said mandrel (10)

El mandril (10), que como anteriormente se ha dicho se mantiene estático tanto en sentido giratorio como en sentido axial, está solidarizado por su extremidad inicial y mediante un robusto soporte (15) a la estructura de la máquina, de manera que su extremo terminal queda en voladizo, para permitir la libre salida del tubo cilíndrico (16) ya conformado, situándose más allá de dicha extremidad libre del mandril (10) un mecanismo de corte, no representado, para la adecuada fragmentación del tubo continuo que se está obteniendo.The mandrel (10), which as previously said remains static both in a rotating direction and in axial sense, is in solidarity with its initial limb and by a robust support (15) to the structure of the machine, of so that its terminal end is cantilevered, to allow the free exit of the cylindrical tube (16) already formed, placing more beyond said free end of the mandrel (10) a mechanism of cut, not shown, for proper tube fragmentation Continuous being obtained.

El mandril (10) está refrigerado, contando a tal efecto con una entrada (17) y una salida (18) de agua, al objeto de evitar que la alta temperatura a la que las bandas (5) llegan a dicho mandril provoque la adherencia de las mismas al mandril, y además en esta zona inicial de dicho mandril (10), se aplica al mismo un líquido suavizante que facilite el deslizamiento superficial de las bandas (5) con respecto al repetidamente citado mandril (10), líquido suavizante de naturaleza aceitosa, que puede aplicarse gota a gota o con cualquier otro tipo de impregnador.The mandrel (10) is refrigerated, counting such effect with an inlet (17) and an outlet (18) of water, in order to prevent the high temperature at which the bands (5) reach said mandrel causes their adhesion to the mandrel, and also in this initial zone of said mandrel (10), it is applied to the same a softening liquid that facilitates the sliding surface of the bands (5) with respect to the repeatedly cited mandrel (10), an oily softening liquid, which can be applied drop by drop or with any other type of impregnator.

El dispositivo arrastrador para las bandas (5) sobre el mandril (10), consiste, como ya se ha dicho con anterioridad, en una ancha correa plana (14), anular, que abrazando perimetralmente al mandril (10) se extiende entre dos cilindros (19), de ejes paralelos, montados a ambos lados del mandril (10). Estos dos cilindros (19) pueden estar accionados independiente y sincronizadamente, mediante respectivos motores alojados en el zócalo (20) de sustentación de los mismos, o bien dicha motorización puede afectar exclusivamente a uno de los cilindros (19), moviéndose el otro sincronizadamente con él a través de la propia transmisión generada por la correa plana (14), pudiendo utilizarse en cualquier caso motores mecánicos o hidráulicos.The dragging device for the bands (5) on the mandrel (10), consists, as already said with previously, on a wide flat belt (14), annular, than hugging perimeter to the mandrel (10) extends between two cylinders (19), with parallel shafts, mounted on both sides of the mandrel (10). These two cylinders (19) can be operated independently and synchronously, by means of respective motors housed in the support base (20) thereof, or said motorization can exclusively affect one of the cylinders (19), the other moving in sync with him through the own transmission generated by the flat belt (14), being able to used in any case mechanical or hydraulic motors.

Dado que la correa (14) ejerce una fuerte tensión sobre los cilindros (19), con tendencia a la aproximación de los mismos, se ha previsto que entre la extremidad superior y libre de los mismos se establezca una barra estabilizadora (21), preferentemente telescópica, es decir de longitud regulable mediante un sistema husillo-tuerca, en el que participa un volante de accionamiento (22), de manera que no sólo se asegura la estabilidad en los ejes de los cilindros (19), sino que además se puede regular la tensión de la correa plana (14), es decir la presión de la misma sobre el mandril.Since the belt (14) exerts a strong tension on the cylinders (19), with a tendency towards the approximation of same, it is planned that between the upper limb and free of they establish a stabilizer bar (21), preferably telescopic, i.e. adjustable length by means of a spindle-nut system, in which a driving wheel (22) participates, so that not only stability in the axes of the cylinders (19) is ensured, but which can also adjust the tension of the flat belt (14), is say the pressure of it on the mandrel.

Claims

1. Machine for the manufacture of tubular bodies, which using as a raw material a plurality of bands each based on a plurality of layers obtained by plant and / or synthetic fibers, combined with melting polymers, with the possibility of incorporating layers of aluminum, bands destined to be wound helically with partial overlapping to configure a tubular body, in which the different bands are definitively fixed to each other by heat welding their plastic component, preferably polymer, is characterized by being constituted from a mandrel (10 ) fixed, both angularly and axially, mounted cantilevered by its initial end on a support (15) and intended to receive tangentially and obliquely to a plurality of bands (5), collaborating with said fixed mandrel (10) a drag device materialized on a flat belt (14), which surrounds the mandrel (10) with interposition of the gru po of bands (5), causes the surface sliding of the latter on the mandrel causing both winding and axial displacement of said bands (5).

2. Machine for the manufacture of tubular bodies, according to claim 1, characterized in that immediately before the mandrel (10) incorporates a tunnel (9) for heating the bands (5), crossed by the latter, tunnel (9) assisted by a hot air generator (12), provided with a fan (13), generator that attacks the tunnel (9) laterally and obliquely in the vicinity of the end of the tunnel through which the bands (5) penetrate.

3. Machine for the manufacture of tubular bodies, according to previous claims, characterized in that the bands (5) are supplied by a rewinder (1), provided with a plurality of independent shafts (3) for the assembly of respective supply coils (4) of the corresponding bands (5), with at least one auxiliary coil (6) collaborating with each main coil (4), mounted on an axis parallel to that of the first one and which becomes operational when the latter is exhausted.

4. Machine for the manufacture of tubular bodies, according to previous claims, characterized in that the mandrel (10) is refrigerated, having for this purpose an inlet (17) and an outlet (18) of cold water, to avoid adhesion of the bands (5) on said mandrel (10) upon contact with the latter.

5. Machine for the manufacture of tubular bodies, according to previous claims, characterized in that in the initial area of the mandrel (10), specifically in the area of incidence thereon for the bands (5), an applicator of a softening liquid is established , oily in nature, to facilitate the sliding of the bands (5) on the mandrel (10).

6. Machine for the manufacture of tubular bodies, according to claims 1 to 3, characterized in that, optionally and to avoid adhesion of the bands (5) to the mandrel (10) when coming into contact with the latter, said means mandrel is provided for cooling to the level of frost, a mattress of the same air or a treatment with Teflon-3, the possibility of using an auxiliary silicone band that is wound on the mandrel under the constituent bands of the tubular body .

7. Machine for manufacturing tubular bodies, according to previous claims, characterized in that the belt (14) that surrounds the initial area of the mandrel (10) and that participates in the dragging device of the band group (5), extends towards both sides of the mandrel (10) and coupled to two cylinders (19), with parallel shafts, which act as draggers of said belt (14), which are properly motorized and synchronized and which also have tensioning means (21) for cited belt.