WO2004039570A1

WO2004039570A1 - Machine for the production of tubular bodies

Info

Publication number: WO2004039570A1
Application number: PCT/ES2003/000560
Authority: WO
Inventors: Jesus SANCHEZ REÑASCO; José Maria SANCHEZ REÑASCO
Original assignee: Sanchez Renasco Jesus; Sanchez Renasco Jose Maria
Priority date: 2002-10-30
Filing date: 2003-10-30
Publication date: 2004-05-13

Abstract

The invention relates to a machine for the production of tubular bodies. The inventive machine comprises a decoiler (1) having numerous coils (5) installed therein, said coils being mounted on respective independent shafts. Next, the invention comprises a heating tunnel (9) which is assisted by a hot air generator (12) which is disposed in a lateral, oblique position. According to the invention, bands (5) arrive at the front end of a fixed mandrel (10) in both the angular and axial directions, said support being cantilever mounted to a support (15) at which the above-mentioned bands (5) arrive in a tangential oblique manner. Moreover, the bands are driven by a flat belt (14) which causes the bands to slide, said bands being partially disposed on top of the mandrel (10). The mandrel is cooled in order to facilitate the fast welding of the plastic and is assisted by a softening-liquid-impregnation device in order to facilitate the sliding of the tubular body obtained on the mandrel. The continuous tubular body thus obtained is divided using a cutting device which is located beyond the outlet end of the mandrel (10).

Description

MACHINE FOR THE MANUFACTURE OF TUBULAR BODIES

D E S C R I P C I Ó N

OBJECT OF THE INVENTION

The present invention relates to a machine that has been specially designed for the manufacture of tubular bodies, specifically cylindrical bodies, usable as packages of different types of products, in granular, powdery or pasty form, as well as usable as formwork elements , in the field of construction, to obtain cylindrical columns.

The machine uses as a raw material, several sheets or continuous bands, which combine raw materials or base of vegetable and / or synthetic fibers, combined with melting polymers, grouping them into a single complex or band that, helically wound and heat welded, gives rise to the body Tubular and cylindrical pursued.

The invention also presents the quality of incorporating heating means of the bands, necessary for a softening of the plastic material, which participates in such bands, and the consequent fusion or heat welding between them to configure the desired tubular body.

The invention consequently contemplates the quality of obtaining a drastic dimensional reduction in the machine or installation, with the consequences that this brings with it from the point of view of use of the cabin in which said machine is established.

BACKGROUND OF THE INVENTION

The applicant is the holder of the Patent of

Invention requested in Spain with the number P8803814, which describes a procedure for the manufacture of tubular containers and pieces of flat geometry.

In said Patent of Invention, the existence of packages and pieces obtained based on sheets or layers of fibrous or non-fibrous materials, such as paper and cardboard or kraft fiber, is known in varying numbers depending on the thickness that it is desired to confer to the walls of the package or piece to be obtained, said sheets being joined together by adhesives or adhesive products, to form a body that, in the specific case of tubular containers, is subjected to a spiral winding, while in the case of a flat geometry piece, is finished off by cutting and die cutting.

In the aforementioned Patent of Invention, in order to eliminate the problems inherent in the use of adhesives, the combination of the paper sheets or the like mentioned above as plastic sheets was foreseen, so that the definitive fixation between layers of the container or flat piece, is achieved by welding the plastic material.

Obviously, the term "tubular containers" encompasses both any type of container itself. said obtained based on this type of material, such as the tubular and cylindrical bodies 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

The machine for the manufacture of tubular bodies that the invention proposes, has been specially designed to obtain cylindrical tubular bodies, using the method of the said Invention Patent, specifically using raw materials based on vegetable and / or synthetic fibers combined with melting polymers , configuring a band or complex, which can also incorporate an aluminum foil within it.

The invention also contemplates the fact that in order to achieve a substantially greater use of the space, a plurality of heat sources, specifically one for each band to be heated, is disposed in the immediate vicinity of a mandrel and in the situation of said tunnel, so that keeping the bands properly spaced by an adequate guidance of them, despite their confluence on the mandrel, in the vicinity of it, leave enough space for the location between them of the heat sources.

More specifically, the machine for the manufacture of tubular bodies object of the invention is structured from a fixed cylindrical mandrel, that is, immobilized, both rotationally and axially, of diameter according to the diameter of the tubular body to be obtained, hollow and provided with cooling means, whose purpose will be described later.

Said mandrel is intended to receive simultaneously in oblique arrangement and longitudinally offset, to a plurality of bands that partially overlap thereon, bands supplied from respective coils independently mounted in a rewinder and that access the mandrel, after passing through a heating tunnel , assisted by a hot air generator, which attacks said tunnel laterally and obliquely in the initial zone of the tunnel and causes adequate heating of the bands, so that the plastic material that participates in them, softens and adopts conditions of thermal adhesion in the superposition between layers, the definitive adhesion taking place practically immediately, thanks to the cooling system of which the mandrel is provided.

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, which by the inclination of said bands, gives rise to the helical winding thereof on the mandrel, with simultaneous longitudinal displacement along the same, of the tube that is obtained.

The mandrel is cantilevered mounted on a support structure from its end corresponding to the entrance of the bands, so that the tubular body obtained comes out freely through the other end of the mandrel, where a cutting device will fragment it into sections of predetermined length.

The non-adhesion of the plastic material that participates in the bands, generally polymeric, to the mandrel, is ensured by the cooling of said mandrels, and in order to facilitate the sliding of the bands on the mandrel, the contribution thereto is provided, in the zone of reception of the bands, of a softening liquid, which acts as a lubricant between the surface of the bands and the surface of the mandrel.

However, the non-adhesion of the constituent material of the tubular body to the mandrel can be achieved by other means, specifically the following:

- Chuck cooling to frost level.

Establishment of a cushion of air surrounding the mandrel, by means of inclined nozzles in the direction of winding the bands.

Mandrel treatment with Teflon-3.

- Simultaneously contributing to the different constituent bands of the tubular body, a silicone auxiliary band that constitutes the support and sliding means on the mandrel. The 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 linear displacement substantially uniform, they can have different angular speeds, depending on the different diameters of the coils used, each coil also being assisted by an auxiliary coil that allows the machine's power to be replenished substantially quickly when the first coil is consumed.

The physical independence between the axes of the different coils, in turn, allows to absorb the differences in the linear speed of the respective bands, generated by their different level in the winding of the same on the mandrel.

It is also the object of the invention, to achieve a better use of space by being configured in the disposition of said mandrel, and in the form of a tunnel, a plurality of heat sources, specifically one for each band to be heated, so that maintaining the bands duly distanced by an adequate guidance of the same, despite their confluence on the mandrel, in the vicinity of it, leave enough space for the location between them of the heat sources, so that the occupation of space generated by the heat sources, be minimal, practically negligible, and with which the mandrel can be located practically next to the unwinder.

Each of the mentioned heat sources, it can be materialized in a nozzle for high temperature air pressure blowing, being configured as an elongated nozzle corresponding to the width of the band and arranged transversely with respect to the latter, in which case, the air pressure circuit may incorporate a coil housed inside a boiler, where the heating of the air occurs, up to temperatures that can reach 300 degrees C, so that the blowing of pressurized air on the continuous bands, causes their instantaneous heating to the working temperature considered as ideal.

Optionally, the aforementioned pressurized hot air nozzles can be replaced by burners located directly in the vicinity of the continuous, gas or infrared bands.

DESCRIPTION OF THE DRAWINGS

To complement the description that is being made and in order to help a better understanding of the features of the invention, this descriptive report is attached, as an integral part thereof, a set of drawings in which for illustrative purposes and not limiting, the following has been represented:

Figure number 1.- Shows a schematic plan representation of the machine for the manufacture of tubular bodies that constitutes the object of the present invention, as a whole, relative to a machine for the manufacture of tubular bodies. Figure number 2.- Shows a detail in perspective of the unwinder.

Figure number 3.- Shows, also according to a perspective view, a partial detail of the heating tunnel, observing in it the access of the bands to the interior thereof.

Figure number 4.- Shows another perspective view of the heating tunnel, on its side opposite to that shown in figure number 3.

Figure number 5.- Shows in partial and upper perspective of the end of the mandrel, through which the different bands access it and on which the dragging device acts.

Figure number 6.- Corresponds to a lateral perspective of the same area of the mandrel, in which the partial overlap between bands is observed.

Figure number 7.- Represents a detail in perspective of said band dragging device.

Figure number 8.- Reflects a schematic plan representation of a machine for manufacturing tubular bodies made in accordance with this embodiment.

Figure number 9.- Represents a detail in perspective of the area of the machine shown in figure number 8, on which the characteristics of the second embodiment of the invention are located. Figure number 10.- Finally corresponds to a schematic representation in side elevation of the assembly represented in figure number 9.

PREFERRED EMBODIMENT OF THE INVENTION

In view of the figures numbers 1 to 7, it can be seen how in the machine for the manufacture of tubular bodies that is recommended, a rewinder (1), represented in detail in figure number 2, participates in which on a support frame (2), a plurality of axes (3) are established, independent of each other, intended to receive respective coils (4) that supply continuous bands (5) of the plasticized paper, each main reel (4) counting with at least one auxiliary coil (6) intended to remain in reserve to eliminate the dead time of the machine when the main coil (4) runs out, at which point the terminal end of the band (5) is fixed, for example, by means of a two-sided adhesive (7), the initial end of the complementary coil (6).

The different bands (5) are conveniently guided by rollers (8) or by any other means towards a heating tunnel

(9), which flows into the vicinity of the mandrel

(10)

Said heating tunnel (9) is provided with interior separators (11), which keep the bands (5) duly independent, being assisted by a hot air generator (12) that attacks said tunnel (9) laterally and obliquely and which in collaboration with a fan (13), supplies air at the initial tunnel zone (9) at a temperature between 160 ° C and 200 ° C, so at the exit of the tunnel (9), a temperature in turn between 140 ° C and 190 ° C is maintained , suitable for the plastic material, specifically the polyethylene, which participates in the bands (5), is in a thermal condition to adhere to both another layer of polyethylene and any other layer of the complex.

After leaving the tunnel (9), the bands (5) reach obliquely to the mandrel (10), being offset in the axial direction of the mandrel (10), as specifically observed in figure number 6, but mostly superimposed, being located in this initial end of the mandrel (10), a drag device materialized in a flat belt (14), which acting externally on the bands (5) and constituting the mandrel (10), a static element, causes said bands (5) to slide ) around the mandrel (10), with a parallel axial displacement thereof, due to its own inclination, that is, causing a helical winding of the bands on the mandrel, with parallel axial displacement thereof along said mandrel (10)

The mandrel (10), which, as previously stated, remains static, both in a rotating and axial direction, is connected by its initial end and by means of a robust support (15), to the structure of the machine, so that its terminal end is cantilevered, to allow the free exit of the cylindrical tube (16) already formed, being located beyond said free end of the mandrel (10), a cutting mechanism, not shown, for the adequate fragmentation of the tube continued to be is getting

The mandrel (10) is refrigerated, having for this purpose an inlet (17) and an outlet (18) of water, in order to prevent the high temperature at which the bands (5) reach said mandrel (10 ), causes them to adhere to the mandrel (10), and in addition, in this initial area of said mandrel (10), a softening liquid is applied thereto which facilitates the surface sliding of the bands (5) with respect to the repeatedly cited mandrel (10), softening liquid of an oily nature, which can be applied drop by drop or with any other type of impregnator.

The dragging device for the bands

(5) on the mandrel (10), consists, as already mentioned above, in a wide flat, annular belt (14), which perimetrically hugging the mandrel (10), extends between two cylinders (19), of parallel shafts, mounted on both sides of the mandrel (10).

These two parallel-axis cylinders (19) can be driven independently and synchronously, by means of respective motors housed in the support base thereof, or said motorization can exclusively affect one of the cylinders (19), moving the other cylinder synchronously with it, through the transmission itself generated by the flat belt (14), being able to be used in any case, mechanical or hydraulic motors.

Because the belt (14) exerts a strong tension on the cylinders (19), with a tendency to approximate them, it is expected that between the upper and free end thereof, that is, of the cylinders (19), a stabilizer bar (21), preferably telescopic, is established, that is to say, of adjustable length by means of a spindle-nut system, in which a steering wheel of drive (22), so that not only the stability in the axes of the cylinders (19) is ensured, but also the tension of the flat belt (14) can be regulated, that is, the pressure thereof on the mandrel (10).

Following the object represented in figures numbers 8, 9 and 10 corresponding to a second embodiment of the invention, it is observed in figure number 8, as in the machine a rewinder participates

(31) in which on a support (32) a plurality of axes (33) are established, independent of each other, intended to receive respective coils (34) supplying two continuous bands (35) based on the vegetable fibers and / or synthetic combined with melting polymers, to which mention has been made previously, each main coil (34) having at least one auxiliary coil (36) destined to remain in reserve to eliminate the dead time of the machine when it occurs the depletion of the main coil. (34), at which time a two-sided adhesive is attached to the terminal end of the band (35), the initial end of the complementary coil (36).

The bands (35), after undergoing a heating phase with a mechanism that in the schematic representation of figure number 8 has been referenced with (39), obliquely reach the mandrel (40), where they are offset in axial direction, such as it is noted specifically in figure number 9, but mostly superimposed, being located at this initial end of the mandrel (40), a dragging device materialized in a flat belt (41), acting externally on the bands (35) and constituting the mandrel (40) a static element, causes said bands to slide around the mandrel (40) with a parallel axial displacement thereof, due to their own inclination, that is, causing a helical winding of the bands on the mandrel (40), with a parallel axial displacement thereof along the latter, thus continuously configuring the tube (42) to be obtained.

Well, according to a preferred example of this second practical embodiment of the invention, under each of the continuous bands (35), a nozzle (43) is established for blowing at high temperature air pressure, specifically at the temperature suitable for the plastic material, specifically polystyrene, which participates in the bands (35), is in thermal conditions, to adhere to both another polystyrene plate and any other layer of the complex, temperature that can reach 300 ° C.

For the supply of the nozzles (43), the use of a boiler (44) in which a coil (45) is established for the circulation of the air that reaches the nozzles (43), pressurized by the fan ( 46), so that the boiler (44) can conveniently distance itself from the heating element

(39) as a whole, that is to say, of the nozzles (43), having no repercussion on the occupation of space, since it allows a more rational use of it.

As mentioned above, the nozzles (43) for blowing hot pressurized air can be replaced by burners located directly next to the bands (35), such as gas burners or infrared burners.

Claims

R E I V I N D I C A C I O N E S

1.- Machine for the manufacture of tubular bodies, which using as a raw material a plurality of bands, each of them based on a plurality of layers obtained by plant and / or synthetic fibers, combined with melting polymers, with the possibility of incorporation of aluminum layers, bands intended 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, 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 dragging device materialized in a flat belt (14), which surrounds the mandrel (10) with interposition of the gr upo 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 the first claim, characterized in that immediately before the mandrel (10), it 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 (12) that attacks the tunnel (9) laterally and obliquely in the vicinity of the end of the tunnel through which they penetrate the s bands (5).

3. Machine for the manufacture of tubular bodies, according to the preceding 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 coils (4) ) suppliers of the corresponding bands (5), each main coil (4) being provided to collaborate at least one auxiliary coil (6) 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 the preceding claims, characterized in that the mandrel (10) is refrigerated, counting for this purpose with an inlet (17) and an outlet

(18) of cold water, to avoid the adhesion of the bands (5) on said mandrel (10), when coming into contact with the latter.

5. Machine for the manufacture of tubular bodies, according to the preceding 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, 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 the first, second and third claims, characterized in that, optionally and to avoid the adhesion of the bands (5) to the mandrel (10), when coming into contact with the latter, it is provided to said mandrel (10) of cooling means up to the level of frost, of a cushion of enveloping air thereof or of a Teflon-3 treatment, the possibility of using a silicone auxiliary band that is wound on the mandrel being also provided (10) under the bands (5) constituting the tubular body.

one . - Machine for the manufacture of tubular bodies, according to the preceding 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 (14).

8. Machine for the manufacture of tubular bodies, according to the preceding claims, characterized in that in a second embodiment, replacing the heating tunnel for the continuous bands (35), with which said bands are brought to thermal adhesion conditions among them, the use of a plurality of heat sources (39), one for each continuous band (35), which are located between them and in position of maximum proximity to the mandrel (40) of winding such bands (35) is provided. ), having provided that the latter tangentially access the mandrel (40) with a degree of angular offset sufficient to allow the location between them of the said heat sources (39).

9. - Machine for the manufacture of tubular bodies, according to the eighth claim, characterized in that the heat sources (39) materialize in pressure blown nozzles (43), which project air transversely with respect to the continuous bands (35), at high temperature, which can reach 300 ° C, said nozzles being

(43) fed at the expense of a heating boiler (44) crossed by a coil (45) through which the pressurized air circulates through a fan

(46).

10. Machine for the manufacture of tubular bodies, according to the eighth claim, characterized in that optionally the heat sources (39) materialize in two burners conveniently distanced from the continuous bands (35), burners that can be gas, infrared or Similary.