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Title:
PROCESS OF BIOCIDAL TREATMENT OF A COATING FOR SURFACES AND COATING FOR SURFACES
Document Type and Number:
WIPO Patent Application WO/2022/070220
Kind Code:
A1
Abstract:
Process of biocidal treatment of a coating (1) for surfaces comprising: - preparing the coating (1) for surfaces comprising a support layer (2) and textile threads (5) woven into the support layer (2), wherein the textile threads (5) protrude from the support layer (2) at a first face (9) of the coating (1) for surfaces; - preparing a biocidal solution; - depositing the biocidal solution onto the first face (9); - drying the biocidal solution.

Inventors:
RADICI MARCO ANTONIO (IT)
Application Number:
PCT/IT2021/050287
Publication Date:
April 07, 2022
Filing Date:
September 21, 2021
Export Citation:
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Assignee:
RADICI PIETRO IND & BRANDS S P A (IT)
International Classes:
D06M16/00; D06M13/352; D06M13/463; D06M13/513; D06M15/256; D06M23/04; D06N3/00
Foreign References:
US20100173121A12010-07-08
US6641829B12003-11-04
US8906115B22014-12-09
Attorney, Agent or Firm:
TIRLONI, Bartolomeo (IT)
Download PDF:
Claims:
CLAIMS

1 . Process of biocidal treatment of a coating (1 ) for surfaces comprising:

- preparing said coating (1 ) for surfaces comprising a support layer (2) and textile threads (5) woven into the support layer (2), said textile threads (5) protruding from said support layer (2) at a first face (9) of said coating (1 ) for surfaces;

- preparing a biocidal solution;

- depositing said biocidal solution onto said first face (9);

- drying said biocidal solution.

2. Process according to claim 1 , wherein said biocidal solution is a liquid mixture, wherein said biocidal solution comprises a first aqueous solution containing a first biocidal component selected in the group: organic silanes, zinc-based biocidal agents, silver-based biocidal agents, or combinations thereof, preferably said first biocidal component is dimethyl-tetradecyl-(3-(trimethoxysilyl)-propylammonium, wherein said first aqueous solution comprises a weight amount of said first biocidal component greater than or equal to 1 .0%, preferably greater than or equal to 2.0%, and less than or equal to 7.0%, preferably less than or equal to 6.0%, and wherein a weight percentage of said first aqueous solution in said biocidal solution is greater than or equal to 10.0%, preferably greater than or equal to 20.0%, and less than or equal to 50.0%, preferably less than or equal to 30.0%.

3. Process according to claim 2, wherein said organic silanes are selected in the group: dimethyl-dichloro-silanes; trimethylsilyl-chlorides; trimethoxysilyl-chlorides; methyltrichloro-silanes; or mixtures thereof, wherein said zinc-based biocidal agents comprise zinc pyrithione, and wherein said silver-based biocidal agents comprise silver ions.

4. Process according to any one of the previous claims, wherein said biocidal solution is a liquid mixture, wherein said biocidal solution comprises a second aqueous solution containing a second biocidal component, wherein said second biocidal component is a combination of reactive silicone polymers selected in the group: poly-dimethyl- siloxane (PDMS); poly-phenyl-siloxane; poly-vinyl-siloxane; poly-tri-fluor-propyl- siloxane; poly-methyl-hydro siloxane (PMHS); cyclo-penta-siloxane; cyclo-hexa- siloxane; or combinations thereof, wherein said second aqueous solution comprises a weight amount of said second biocidal component greater than or equal to 10.0%, preferably greater than or equal to 20.0%, and less than or equal to 60.0%, preferably less than or equal to 40.0%, and wherein a weight percentage of said second aqueous solution in said biocidal solution is greater than or equal to 10.0%, preferably greater than or equal to 20.0%, and less than or equal to 50.0%, preferably less than or equal to 30.0%.

5. Process according to any one of the previous claims, wherein said biocidal solution is a liquid mixture, wherein said biocidal solution comprises a third aqueous solution containing a repellent agent comprising a polymer selected in the group: poly-fluor- olefins, poly-fluor-ethylene, poly-fluor-propylene, tetra-fluor-ethylene copolymers, vinylidene fluoride copolymers, hexa-fluor-propylene or combinations thereof, wherein said third aqueous solution comprises a weight amount of said repellent agent greater than or equal to 10.0%, preferably greater than or equal to 20.0%, and less than or equal to 60.0%, preferably less than or equal to 40.0%, and wherein a weight percentage of said third aqueous solution in said biocidal solution is greater than or equal to 10.0%, preferably greater than or equal to 15.0%, and less than or equal to 30.0%, preferably less than or equal to 20.0%.

6. Process according to any one of the previous claims, wherein said biocidal solution is a liquid mixture, wherein said biocidal solution comprises a fourth aqueous solution containing a foaming agent, wherein said foaming agent is an amine-oxide-based surfactant and/or a amine-oxide-based blowing agent, wherein said fourth aqueous solution comprises a weight amount of said foaming agent greater than or equal to 25.0%, preferably greater than or equal to 35.0%, and less than or equal to 80.0%, preferably less than or equal 60.0%, wherein a weight percentage of said fourth aqueous solution in said biocidal solution is greater than or equal to 0.5%, preferably greater than or equal to 1 .0%, and less than or equal to 5.0%, preferably less than or equal to 3.0%, and wherein preparing said biocidal solution comprises adding water such that a weight percentage of said water added in the biocidal solution is greater than or equal to 10.0%, preferably greater than or equal to 20.0%, and less than or equal to 50.0%, preferably less than or equal to 40.0%.

7. Process according to any one of the previous claims, wherein said biocidal solution comprises a first aqueous solution which is a solution marketed by DEVAN under the trade name BI-OME AM5™, wherein said biocidal solution comprises a second aqueous solution which is a solution marketed by DEVAN under the trade name Crealink AV™, wherein said biocidal solution comprises a third aqueous solution which 14 is a solution marketed by Prochimica Novarese S.p.A. under the trade name FLUOROTEX ECO MT™, and wherein said biocidal solution comprises a fourth aqueous solution which is a solution marketed by PULCHRA LACHITER under the trade name Nonalux UL™.

8. Process according to any one of the previous claims, comprising foaming said biocidal solution to obtain a biocidal foam, wherein depositing said biocidal solution comprises depositing said biocidal foam onto said first face (9), wherein drying said biocidal solution comprises drying said biocidal foam, the process further comprising advancing said coating (1 ) for surfaces unwound from a roll (80) on a spreading surface (85) along an advancement direction (400) parallel to the spreading surface (85), wherein said depositing said biocidal foam comprises dispensing said biocidal foam from a fixed dispensing station (36), wherein said depositing said biocidal foam is carried out by spraying or gravity casting of said biocidal foam, and wherein said biocidal foam has a density greater than or equal to 10 g/l and less than or equal to 50 g/L

9. Process according to claim 8, wherein said depositing said biocidal foam is carried out with a flow rate such that a mass of said biocidal foam per surface unit of said coating (1 ) is greater than or equal to 50 g/m2, preferably greater than or equal to 70 g/m2, and/or less than or equal to 150 g/m2, preferably less than or equal to 100 g/m2, and wherein said drying said biocidal foam comprises subjecting said biocidal foam to a temperature greater than or equal to 50°C, preferably greater than or equal to 70°C, and/or less than or equal to 120°C, preferably less than or equal to 90°C, for a time interval greater than or equal to 80 s, preferably greater than or equal to 115 s, and/or less than or equal to 240 s, preferably less than or equal to 170 s.

10. Coating (1 ) for surfaces comprising a support layer (2), textile threads (5) woven into the support layer (2), said textile threads (5) protruding from said support layer (2) at a first face (9) of said coating (1 ) for surfaces and a structural layer (3) arranged at opposite side of said support layer (2) with respect to said first face (9), wherein onto said first face (9) of said coating (1 ) a dry biocidal solution is deposited.

Description:
DESCRIPTION

Title: PROCESS OF BIOCIDAL TREATMENT OF A COATING FOR SURFACES

AND COATING FOR SURFACES

Technical field of the invention

The present invention relates to a process of biocidal treatment of a coating for surfaces, in particular walkable surfaces, and a coating for surfaces comprising a face onto which a dry biocidal solution is deposited.

Stat of the art

Coating for surfaces means a coating (e.g., carpet and/or moquette) comprising (e.g., natural and/or synthetic) textile fibres woven for creating a walkable and/or aesthetic surface, for example as used in the construction of flooring for commercial and/or residential use (e.g., hotels, residences, private homes, offices etc.) and/or for naval use (e.g., cabins, internal corridors, covered common areas).

Typically, the structure of a carpet and/or moquette type coating for surfaces comprises a support layer for the textile fibres (commonly called “primary backing”) and a structural layer (commonly called “secondary backing”), typically glued to the support layer at opposite side with respect to the textile fibres.

Summary of the invention

The Applicant has perceived to be advantageous subjecting the coatings for surfaces, prior to installation, to a surface treatment for reducing, or eliminating, the pathogenic agents which may be onto the walkable face, i.e., the face from which the textile fibers protrude.

In such context, the Applicant has observed that these processes of biocidal treatment have to be very effective in the breaking down of the pathogenic load present on the walkable face for limiting health problems for the users, especially during a health crisis such as a violent epidemic or pandemic. Furthermore, the biocidal effect must last over time, even after long storage periods and/or laying periods and/or walking on periods. The Applicant has also observed that such processes of biocidal treatment must not significantly lengthen the times and/or costs of the normal manufacturing process of a coating for walkable surfaces.

Furthermore, such processes of biocidal treatment must avoid causing a damage of the textile fibers of the coating for surfaces, and a consequent loss of the aesthetic and/or physical properties. The Applicant has therefore perceived and faced the problem of realizing a process of biocidal treatment of a coating for surfaces having a high and long-lasting efficiency in the breaking down of the pathogenic load, while keeping low the costs and/or manufacturing times of the coating for surfaces, and/or intact the aesthetic and/or physical properties of the coating for surfaces.

According to the Applicant, this problem is solved by a process of biocidal treatment of a coating for surfaces and by a coating for surfaces comprising a face onto which a dry biocidal solution is deposited according to the attached claims and/or having one or more of the following features.

According to an aspect the invention relates to a process of biocidal treatment of a coating for surfaces comprising:

- preparing said coating for surfaces comprising a support layer and textile threads woven into the support layer, said textile threads protruding from said support layer at a first face of said coating for surfaces;

- preparing a biocidal solution;

- depositing said biocidal solution onto said first face;

- drying said biocidal solution.

According to an aspect the invention relates to a coating for surfaces comprising a support layer, textile threads woven into the support layer, said textile threads protruding from said support layer at a first face of said coating for surfaces and a structural layer arranged at opposite side of said support layer with respect to said first face, wherein onto said first face of said coating a dry biocidal solution is deposited.

The Applicant has surprisingly found that the biocidal solution deposited onto the face of the coating for surfaces from which the textile threads protrude has a high and durable ability to reduce the pathogenic load present onto this face of the coating for surfaces. In this way it is therefore possible, on one hand, (almost) instantaneously breaking down the pathogenic load nested between the textile threads of the coating for surfaces at the time of application of the biocidal solution, and, on the other hand, maintaining over time the pathogenic load present onto the first face of the coating for surfaces at very low, or substantially null, levels. Furthermore, the Applicant believes that the process of biocidal treatment according to the present invention, in light of its simplicity, allows keeping low the manufacturing times and/or the manufacturing costs of the treated coating for surfaces. The present invention in one or more of the aforesaid aspects can have one or more of the following preferred features.

Preferably it is provided foaming said biocidal solution to obtain a biocidal foam. Preferably said depositing said biocidal solution comprises depositing said biocidal foam onto said first face. Preferably said drying said biocidal solution comprises drying said biocidal foam. The Applicant has observed that the biocidal foam, obtained by foaming the biocidal solution, allows a deposition of the biocidal solution onto the first face of the coating for surfaces so that the active component/s is/are uniformly distributed, even in case wherein it/they is/are present in small percentages.

Preferably said textile threads are woven by tufting into the support layer. Alternatively, one or more of the following manufacturing types can be used: Axminster, Wilton, Face to Face, Needle-punching.

Preferably it is provided providing a roll of said coating for surfaces.

Preferably it is provided advancing said coating for surfaces, more preferably unwound from said roll, on a spreading surface along an advancement direction parallel to the spreading surface.

Preferably said depositing said biocidal foam comprises dispensing said biocidal foam from a fixed dispensing station.

In this way the process of biocidal treatment can be performed in an industrially simple way.

Preferably said biocidal solution is a liquid mixture (i.e. , without solid parts). In this way, the production of the biocidal solution is simplified since the mixing of the constituents of the biocidal mixture is simpler.

Preferably said biocidal solution comprises a first biocidal, more preferably antibacterial, component.

Preferably said first biocidal component is selected in the group: organic silanes, zinc- based biocidal agents, silver-based biocidal agents, or combinations thereof. More preferably said first biocidal component is an organic silane. The Applicant has found that these components substantially do not cause either an instantaneous damage or a deterioration over time of the textile threads, which allows keeping the aesthetic and/or physical properties of the coating for surfaces substantially intact.

Preferably said organic silanes are selected in the group: dimethyl-dichloro-silanes; trimethylsilyl-chlorides; trimethoxysilyl-chlorides; methyl-trichloro-silanes; or mixtures thereof. In this way, it is used an easily available biocidal component having good biocidal, in particular antibacterial, properties.

In one particularly preferred embodiment said first biocidal component comprises a trimethoxysilyl-chloride, more preferably said first biocidal component is dimethyl- tetradecyl-(3-(trimethoxysilyl)-propylammonium chloride. In this way, according to the Applicant, a class of compounds able to provide high biocidal properties to the solution is used, since the compounds of the above class, and in particular the above compound, are able to form a thin film capable of instantly eliminating microorganisms once deposited onto the first face of the coating and to maintain over time the pathogenic load at very low, if not null, levels. Furthermore, according to the Applicant, this class of compounds is particularly suitable for being used for both synthetic and natural textile threads.

Preferably said zinc-based biocidal agents comprise zinc pyrithione. In this way, the first biocidal component is provided with a broad-spectrum biocidal action since zinc- based compounds, and in particular zinc pyrithione, are also effective against molds and fungi.

Preferably said silver-based biocidal agents comprise silver ions. In this way, it is used a biocidal compound that has proven safety in terms of health risks for users, since silver is classified as a hypoallergenic material.

Preferably said biocidal solution comprises a first aqueous solution containing said first biocidal component. Preferably said first aqueous solution comprises a weight amount of said first biocidal component greater than or equal to 1 .0%, more preferably greater than or equal to 1 .5%, even more preferably greater than or equal to 2.0%, and less than or equal to 7.0%, more preferably less than or equal to 6.5%, even more preferably less than or equal to 6.0%.

In one particularly preferred embodiment said first aqueous solution is a solution marketed by DEVAN under the trade name BI-OME AM5™.

Preferably a weight percentage of said first aqueous solution in said biocidal solution is greater than or equal to 10.0%, more preferably greater than or equal to 15.0%, even more preferably greater than or equal to 20.0%, and less than or equal to 50.0%, more preferably less than or equal to 40.0%, even more preferably less than or equal to 30.0%.

In this way, it is used an amount of the first biocidal component in the biocidal solution able to provide the biocidal capacity to the solution, in particular against bacteria, molds and fungi.

Preferably said biocidal solution comprises a second biocidal component.

Preferably said second biocidal component is a reactive polymer or a combination of reactive polymers, more preferably selected in the group of silicone alkyl- or arylpolymers (i.e., comprising the covalent bond silicon-oxygen (Si-O)). Preferably said silicone polymers are selected in the group: poly-dimethyl-siloxane (PDMS); poly- phenyl-siloxane; poly-vinyl-siloxane; poly-tri-fluor-propyl-siloxane; poly-methyl-hydro siloxane (PMHS); cyclo-penta-siloxane; cyclo-hexa-siloxane; or combinations thereof. According to the Applicant, these reactive polymers are able to increase the biocidal capacity of the solution since, in particular in case wherein the first biocidal component is an organic silane, these reactive polymers give biocidal capacity to the solution also against virus types characterized by the presence of a protective envelope (such as influenza viruses, H1 N1 viruses - e.g., swine flu or avian flu -, hepatitis C virus, etc.). Preferably said biocidal solution comprises a second aqueous solution containing said second biocidal component. Preferably said second aqueous solution comprises a weight amount of said second biocidal component greater than or equal to 10.0%, more preferably greater than or equal to 15.0%, even more preferably greater than or equal to 20.0%, and less than or equal to 60.0%, more preferably less than or equal to 50.0%, even more preferably less than or equal to 40.0%.

In one particularly preferred embodiment said second aqueous solution is a solution marketed by DEVAN under the trade name Crealink AV™.

Preferably a weight percentage of said second aqueous solution in said biocidal solution is greater than or equal to 10.0%, more preferably greater than or equal to 15.0%, even more preferably greater than or equal to 20.0%, and less than or equal to 50.0%, more preferably less than or equal to 40.0%, even more preferably less than or equal to 30.0%.

In this way, a sufficient amount of the second biocidal component is used in the biocidal solution for giving the desired capacities to the biocidal solution.

Preferably, said weight percentage of said first aqueous solution and said weight percentage of said second aqueous solution are equal. In this way, the biocidal capacity of the solution is maximized, using the same amount of first and second biocidal component. The Applicant has in fact found that, in particular in case wherein the first biocidal component is an organic silane, equal weight percentages of the first and second aqueous solutions allow an amplification of the biocidal effect of the solution, since the interaction between the first and the second biocidal component is maximized.

Preferably said biocidal solution comprises a repellent agent, more preferably comprising a polymer comprising an aliphatic chain made of at least four, more preferably at least six, carbon atoms and partially, more preferably totally, fluorinated. Preferably said polymer is selected in the group: poly-f luor-olef ins, poly-fluor-ethylene, poly-fluor-propylene, tetra-fluor-ethylene copolymers, vinylidene fluoride copolymers, hexa-fluor-propylene, or combinations thereof. In this way, according to the Applicant, it is possible giving to the biocidal solution also hydro-repellent and oil-repellent properties since the aforesaid polymers increase the hydrophobic properties of the biocidal solution and significantly decrease the surface tension of the biocidal solution. In other words, the presence of fluorinated polymers in the biocidal solution gives antistain properties to the solution.

Preferably said biocidal solution comprises a third aqueous solution, more preferably an aqueous emulsion, containing said repellent agent. Preferably said third aqueous solution comprises a weight amount of said repellent agent greater than or equal to 10.0%, more preferably greater than or equal to 15.0%, even more preferably greater than or equal to 20.0%, and less than or equal to 60.0%, more preferably less than or equal to 50.0%, even more preferably less than or equal to 40.0%.

In one particularly preferred embodiment said third aqueous solution is a solution marketed by Prochimica Novarese S.p.A. under the trade name FLUOROTEX ECO MT™.

Preferably a weight percentage of said third aqueous solution in said biocidal solution is greater than or equal to 10.0%, more preferably greater than or equal to 12.0%, even more preferably greater than or equal to 15.0%, and less than or equal to 30.0%, more preferably less than or equal to 25.0%, even more preferably less than or equal to 20.0%.

In this way the percentage of repellent agent in the solution is enough for providing suitable anti-stain properties to the biocidal solution.

Preferably said biocidal solution comprises a foaming agent. In this way it is possible obtaining the foaming of the biocidal solution. Preferably said foaming agent is a surfactant and/or a blowing agent, more preferably an amine-oxide-based blowing agent. In this way, it is used a foaming agent easily available on the market and which simply allows the transition from liquid solution to foam.

Preferably said biocidal solution comprises a fourth aqueous solution containing said foaming agent. Preferably said fourth aqueous solution comprises a weight amount of said foaming agent greater than or equal to 25.0%, more preferably greater than or equal to 30.0%, even more preferably greater than or equal to 35.0%, and less than or equal to 80.0%, more preferably less than or equal to 70.0%, even more preferably less than or equal to 60.0%.

In one particularly preferred embodiment said fourth aqueous solution is a solution marketed by PULCHRA LACHITER under the trade name Nonalux UL™.

Preferably a weight percentage of said fourth aqueous solution in said biocidal solution is greater than or equal to 0.5%, more preferably greater than or equal to 0.8%, even more preferably greater than or equal to 1 .0%, and less than or equal to 5.0%, more preferably less than or equal to 4.0%, even more preferably less than or equal to 3.0%. In this way the percentage of foaming agent in the solution is sufficient to allow the foaming of the biocidal solution.

Preferably preparing said biocidal solution comprises adding water so that a weight percentage of said water added in the biocidal solution is greater than or equal to 10.0%, more preferably greater than or equal to 15.0%, even more preferably greater than or equal to 20.0%, and less than or equal to 50.0%, more preferably less than or equal to 45.0%, even more preferably less than or equal to 40.0%. In this way the biocidal solution has a suitable dilution for simplifying the subsequent application.

Preferably said biocidal foam has a density greater than or equal to 10 g/l, more preferably greater than or equal to 20 g/l, and less than or equal to 50 g/l, more preferably less than or equal to 40 g/l. In this way, the application degree of the solution is easily controlled.

Preferably said depositing of said biocidal foam is carried out by spraying or gravity casting of said biocidal foam.

Preferably said depositing said biocidal foam is carried out with a flow rate such that a mass of said biocidal foam per surface unit of said coating is greater than or equal to 50 g/m 2 , more preferably greater than or equal to 60 g/m 2 , even more preferably greater or equal to 70 g/m 2 , and/or less than or equal to 150 g/m 2 , more preferably less than or equal to 120 g/m 2 , even more preferably less than or equal to 100 g/m 2 . In this way, according to the Applicant, a sufficient mass per surface unit of the first and/or second biocidal component is deposited for obtaining the desired breaking down and maintenance at low, or null, levels of the pathogenic load.

Preferably said drying said biocidal foam comprises subjecting said biocidal foam to a temperature for a time interval. Preferably said temperature is greater than or equal to 50°C, more preferably greater than or equal to 60°C, even more preferably greater than or equal to 70°C, and/or less than or equal to 120°C, more preferably less than or equal to 105°C, even more preferably less than or equal to 90°C. Preferably said time interval is greater than or equal to 80 s, more preferably greater than or equal to 100 s, even more preferably greater than or equal to 1 15 s, and/or less than or equal to 240 s, more preferably less than or equal to 200 s, even more preferably less than or equal to 170 s.

In this way it is possible obtaining the evaporation of the aqueous component of the biocidal foam, favouring the drying of the biocidal foam in an industrial way.

Brief description of the drawings

Figures 1 a-1 c schematically show subsequent steps of an example of process for manufacturing a coating for surfaces that will undergo a process of biocidal treatment according to an embodiment of the present invention;

Figure 2 shows an example of coating for surfaces which will undergo a process of biocidal treatment according to an embodiment of the present invention.

Figures 3a-3b schematically show an example of a process of biocidal treatment of a coating for surfaces according to the present invention.

Detailed description of some embodiments of the invention

The features and the advantages of the present invention will be further clarified by the following detailed description of some embodiments of the present invention, presented by way of non-limiting example, with reference to the attached figures.

In general, the process of biocidal treatment of the present invention is applicable to any type of coating for surfaces. In the following paragraphs, an example of coating for surfaces and a related manufacturing process, particularly suitable for undergoing the process of biocidal treatment the present invention, is described, purely by way of illustration. In the figures, in particular in figure 2, with number 1 it is exemplarily indicated a coating for surfaces which exemplarily comprises a support layer 2 (“primary backing”), textile threads 5 woven by tufting in the support layer 2 which protrude from the support layer 2 at a first face 9 of the coating 1 , a structural layer 3 (“secondary backing”) arranged at opposite side of the support layer 2 with respect to the first face 9, and exemplarily a fixing layer 4 interposed between the support layer 2 and the structural layer 3 for fixing the support layer 2 and the structural layer 3 to each other.

In the embodiment shown, exemplarily the structural layer 3 is a needle-punched nonwoven fabric, while the support layer 2 is a spun-bond type non-woven fabric made of polyamide (PA) and polypropylene (PP) fibers.

Exemplarily the fixing layer 4 is made of styrene-butadiene rubber latex (SBR latex) or styrene-butadiene latex (SBL).

Exemplarily the textile threads 5 are made of wool (about 80%) and polyamide (PA), and exemplarily the textile threads 5 have a velvety structure. In one not shown embodiment, the textile threads comprise a first plurality of threads having a velvety structure and a second plurality of threads having a curly structure. In this embodiment, the twisted curly threads averagely remain more proximal to the support layer and have different aesthetic characteristics with respect to velvety threads.

With reference to figure 1 a, it is shown a step of weaving by tufting 33, at the tufting station 75 (for example comprising a tufting machine marketed by Cobble™), of a yarn inside the support layer 2 for obtaining the artificial threads 5 which entirely pass through the support layer 2. Typically, weaving by tufting the yarn into the support layer 2 comprises making end portions of the artificial threads 5 which protrude from the support layer 2, through the cutting of the yarn loops.

With reference to Figure 1 b, it is exemplarily shown the direct application on the support layer 2 of a liquid mixture 50 precursor of the fixing layer 4. The mixture 50 (e.g., LAITEX NF-5617 of LAIEX™) is arranged in the tank 200 at the spreading station 34.

Alternatively, the liquid mixture can be directly applied on the structural layer instead of on the support layer.

In figure 1 c, after the application of the mixture 50, the structural layer 3 (or the support layer, in the alternative embodiment) is laid on the liquid mixture 50, on the opposite side with respect to the support layer 2 (or the structural layer), and for example simultaneously with the laying of the structural layer 3 (or of the support layer), it is provided thermosetting the mixture 50 (for example by an oven 71 thermostated at a temperature equal to about 135°C for a time interval equal to about 10 minutes) for transforming it into the fixing layer 4.

Exemplarily, during the making of the coating 1 for surfaces, it is provided preparing a biocidal solution inside a mixer 81 (fig. 3a). In this way, the process of biocidal treatment is speeded up since the manufacturing operations of the coating for surfaces and of the biocidal solution take place in parallel.

Exemplarily the biocidal solution is a liquid mixture comprising:

- a first aqueous solution containing a first biocidal component. For example, the first aqueous solution is a solution marketed by DEVAN under the trade name BI-OME AM5™ containing dimethyl-tetradecyl-(3-(trimethoxysilyl)-propylammonium;

- a second aqueous solution containing a second biocidal component. For example, the second aqueous solution is a solution marketed by DEVAN under the trade name Crealink AV™ containing a combination of reactive silicone polymers;

- a third aqueous solution, exemplarily in the form of an emulsion, containing a repellent agent. For example, the third aqueous solution is a solution marketed by Prochimica Novarese S.p.A. under the trade name FLUOROTEX ECO MT™ containing an aliphatic polymer made of six totally fluorinated carbon atoms;

- a fourth aqueous solution containing a foaming agent. For example, the fourth aqueous solution is a solution marketed by PULCHRA LACHITER under the trade name Nonalux UL™ containing an amine-oxide-based foaming agent.

Exemplarily the biocidal solution comprises a weight percentage for each of the first and second aqueous solutions equal to 25.0%, a weight percentage of the third aqueous solution equal to 18.0%, a weight percentage of the fourth aqueous solution equal to 2.0% and a weight percentage of additional water equal to 30.0%.

Subsequently to the preparation of the biocidal solution, the process of biocidal treatment comprises foaming the biocidal solution for obtaining a biocidal foam which exemplarily has a density equal to 30 g/l . Exemplarily the biocidal foam is obtained by mechanical stirring inside the foaming station 35.

Once the biocidal foam has been obtained as explained above, as schematically shown in figure 3a, the process of biocidal treatment exemplarily comprises placing the coating 1 for surfaces in the shape of a roll 80 on a carriage (not shown) which comprises an unwinding system (also not shown) comprising one or more rotation members for rotating the roll 80 and unwinding a flap of the coating 1 for surfaces.

Exemplarily the unrolled coating 1 for surfaces is advanced on a spreading plane 85 along an advancement direction (represented by arrow 400) parallel to the spreading plane 85.

Preferably the biocidal foam is deposited onto the first face 9 of the coating 1 (i.e., the face from which the textile threads 5 protrude) by dispensing nozzles, forming part of a dispensing station 36 exemplarily fixed and integral with the foaming station 35.

Exemplarily a mass of biocidal foam equal to 90 g is deposited on each square meter of the first face 9 of the coating 1 for surfaces.

In one not shown embodiment, it is provided keeping the coating for surfaces fixed on the spreading plane after unwinding from the roll and depositing the biocidal foam onto the first face of the coating by sliding a dispensing station movable with respect to the unwound coating for surfaces. In this way it is possible to carry out the deposition of the biocidal foam in an industrially simple way.

Subsequent to the deposition of the biocidal foam onto the first face of the coating, the process comprises drying the biocidal foam (fig.3b), exemplarily by passing the coating for surfaces thermostated at a temperature exemplarily equal to about 80°C in an oven for a time interval exemplarily equal to about 140 seconds.

Upon exiting the oven 86, the coating for surfaces is thus obtained, which comprises the support layer 2, the textile threads 5, the structural layer 3 and the dry biocidal solution deposited onto the first face 9 of the coating 1 .