DESCRIPTION

The present invention relates to a method for manufacturing a tubular device of round or polygonal shape for acoustic insulation, in particular for the insulation of pipes for the forced or natural ventilation.

Tubular devices are known for the sound insulation of rigid or semi-rigid ventilation pipes.

The object of the present invention is to provide a method for manufacturing a round or polygonal tubular device for acoustic insulation of ventilation tubes of flexible and soft type.

Another object is to provide for a method for making a round or polygonal tubular device for acoustic insulation, which is of simple construction.

In accordance with the present invention, these aims and others are achieved by a method for manufacturing a tubular device of round or polygonal shape for acoustic insulation that comprises: a first flexible fabric of glass fiber; a second flexible fabric of glass fiber; an insulating material made of fibreglass, placed between said first fabric and said second fabric; said method comprises the steps of: joining together said first fabric and said insulating material by means of at least two longitudinal joining means; fold in two said first fabric and said insulating material so as to join the outer sides and so that said insulating material is arranged externally; joining said outer sides by means of longitudinal connection means to form an intermediate tubular element; placing on said intermediate tubular element said second fabric; joining said intermediate tubular element and said second fabric, to form said polygonal tubular device, by means of transverse joining means placed in proximity of the heads of said polygonal tubular device.

Additional features of the invention are described in the dependent claims.

Thanks to the present invention a tubular device for the flexible acoustic insulation and collapsible on itself is obtained.

It will also be easily transported, thanks to the minimum space when is squeezed on itself, being all the materials used flexible.

The characteristics and advantages of the present invention will become apparent from the following detailed description of an embodiment thereof, illustrated by way of non- limiting example in the accompanying drawings, in which:

Figure 1 shows a polygonal tubular device for acoustic insulation, in a first phase of manufacturing, according to the present invention;

Figure 2 shows a polygonal tubular device for the acoustic isolation, in a second phase of manufacturing, according to the present invention;

Figure 3 shows a polygonal tubular device for acoustic insulation, in a third phase of manufacturing, according to the present invention;

Figure 4 shows a polygonal tubular device for acoustic insulation, in a fourth phase of manufacturing, according to the present invention;

Figure 5 shows a polygonal tubular device for acoustic insulation, in a fifth phase of manufacturing, according to the present invention;

Figure 6 shows a polygonal tubular device for acoustic insulation, in a sixth phase of manufacturing, according to the present invention;

Figure 7 shows a series of variants of tubular devices of round and polygonal shape for sound insulation, according to the present invention. Referring to the attached figures, a polygonal tubular device 10 for acoustic insulation, according to the present invention, comprises a first flexible fabric 11 in a glass fiber fabric for example from 120-250 g/m ^A 2, or other material suitable for the purpose, which constitutes the inner sheath of the device 10, a second flexible fabric 12 in a glass fiber fabric for example from 200-250 g/m ^A 2, or other material suitable for the purpose, which constitutes the outer sheath of the device 10.

Between first fabric 11 and second fabric 12 is placed an insulating acoustic material 13 in a tubular shape for example of fibreglass from 15-25 kg/m ^A 3 with the thickness for example of 40-50mm, or other material suitable for the purpose, for example of the type having trade name ULTRACOUSTIC or Ekovetro®M.

The fibreglass makes the acoustic insulation and at the same time, also carries out the thermal insulation.

The length of the device 10 may be any according to requirements, for example 60 cm. For carrying out the device 10, it is placed on a floor the insulating material 13 and above the first fabric 11.

The size of the first fabric 11 and the insulating material 13 is that required to provide a device 10, and then for a tubular device 10, for example a square cross section long 60 cm and with a side of 10 cm, the size will be 60 x 40 cm.

Sewings 14 are made on the two extreme sides (or external) 15 and 16, in the longitudinal direction of the tube (along the 60 cm length), then, in the case of a square section tubular device 10, are carried out three more longitudinal sewing 17 equidistant spaced from each other and from the first two sewings 14.

The first fabric 11 and the insulating material 13 stitched to each other, are folded along the central sewing 17 so as to have the outer sides 15 and 16 surmounted between them, and the insulating material 13 external.

The external sides 15 and 16 are then sewn on the edge with a further sewing 18.

Alternatively to the sewings may be used staples or other fastening system suitable for the purpose and at the state of technic.

Pushing the outer sides of the manufactured article will be obtained a tubular element 20 with a square section.

On the tubular element 20 is fitted the second fabric 12, preferably already in a tubular shape.

It is then made the top sewing 21, edgings or other system suitable for the purpose, to fix the second fabric 12 to the tubular element 20, and get the device 10.

In proximity of the top sewing 21 are fixed one or more clips, buttons, Velcro or other system for the purpose, 22 for each side, for merging multiple devices 10 between them. With the same process of this embodiment, you can obtain other forms in addition to the square, carrying out the appropriate number of longitudinal sewings, for example, triangular 30, octagonal 31, or still other forms as rectangular, hexagonal etc., or even circular 32.

In fact, they are realized sewings or other fastening system, suitable for the purpose, for each edge of the polygon to be obtained.