NOISEFREETEX- Demonstrative Solutions To Reduce Noise Pollution In Industrial Areas, Using Finishing Technologies In Textile Materials
LIFE09 ENV/ES/000461
This website provides public information about NOISEFREETEXT project co-funded by LIFE+ programm with number LIFE09 ENV/ES/000461.
Official start date of the project was 1st January 2011 with a duration of 36 months

Project objectives:

This project aims to validate demonstrative solutions to reduce noised pollution mainly in industrial zones that are close to the urban areas. Finishing technologies in textile material will be used to that purpose. These solutions based on textile materials, will be used as constructive elements in industrial facilities walls, floors, ceilings and acoustic barrier walls in roads, in order to minimize the environmental noise impact.
The use of textile materials in the infrastructures can provide significant improvements in the acoustic absorption of all the frequency range of interest to this field, including low and mid- to-low frequencies. These frequency ranges show more problems in the decrease of noise levels. Textile materials are mostly lightweight, resistant, and adaptable substrates which can be treated with finishing processes to improve their basic properties. Production of synthetic and natural textile materials permits optimised products to be produced through the design and adaptation of structural and morphologic properties; in addition textile materials can be coated and finished improving acoustic absorption and isolation. Moreover, by their characteristics, these materials are ideal for the decrease of the scenic impact.


Specific Objectives:

  • To know the national and European acoustic specifications in building and environmental requirements, mainly to industrial areas.
  • To define specific textile materials which have interesting properties like sound absorption materials and moreover that can be improved and optimized. One option will be to reuse the textile waste from industrial processes like resins, spinning powder, cut-offs, selvages, defective items.
  • To work with different kinds of finishing processes, mainly electrospinning, plasma surface treatments and coatings to improve results of basic textile materials.
  • To validate the demonstrative solutions or prototype materials developed in acoustic field to reduced noise pollution, for example, noise barriers, encapsulated systems, etc.
  • To study the compatibility of the developed solutions with the fire behaviour in order to abide by the specific laws and requirements in this field, like the case of the “32002L0049 - Assessment and management of environmental noise Directive 2002/49/EC of the European Parliament and of the Council of 25 June 2002 relating to the assessment and management of environmental noise OJ L 189, 18.7.2002, p. 12 – 25 and its transcriptions to the state members of the CEE.
  • The dissemination and transfer of these solutions to construction industry, including them into the Constructive Elements Catalogue which is a public document annually issued by Instituto de Ciencias de la Construcción Eduardo Torroja.
  • The dissemination and transfer of these solutions to textile, and acoustic isolation materials companies via leaflets, web pages, publication in specialist magazines, mail shots and demonstrations at fairs etc. Moreover, articles publication and conferences for the acoustic community. 
  • To organize events at European level in order to disseminate the Project results to all the target public.

Actions and means involved:

The methodology used to achieve these objectives is primarily based on the compilation of all the documentation and information, related to acoustic specifications in building and environmental requirements and on the other hand, all the information related to specific textile materials with some sound absorption and other properties, both nationally and internationally.
The second step to develop in this project is focused on applying different finishing processes to improve and optimize the acoustic properties of the textile materials:
  • Electrospinning: Is a technology which uses a high voltage source of energy to create a web or covering formed by the fibres, with diameters ranging from 50 to 500 nm. The procedure is based on the creation of a polymeric solution of the chosen polymer, which maintains the adequate properties for electrospinning in terms of viscosity, electrical conductivity, and surface tension. Previous experiences show that the nanofibre webs can improve the absorption of the base material with only a negligible increase in weight and volume (1 g/m2 and 0.2 mm thickness).
  • Plasma surface treatments: Surface modification of fabrics and polymeric materials using plasma technology causes important changes in the wettability and roughness of treated surfaces. Cold plasma is one of the most effective surface modification processes of textile materials and it could improve the adhesion between different textile materials to perform the final solution in order to reduce the noise pollution.
  • Coating processes: This kind of processes allows to improve and to optimize the basic and conventional textile properties and characteristics because the interaction between the textile substrate and the polymeric resins enhances the basic ones and give new properties to the final product. The coating processes offer wide range of possibilities depending on the chemical products and the kind of technology applied: hot melt, air knife, knife over cylinder, grave roller.
The validation of the demonstrative solutions or prototype materials will be developed in three clearly defined stages:
  • Validation laboratory scale: The results of these analyses will confirm if the materials are appropriate or not for the project objectives. They will indicate, as well, the improvement possibilities and the directives to continue with the second stage.
  • Validation of the demonstrative solutions: The second stage in the validation phase includes two procedures; the first one consists of performing the simulations with specific programs from the obtained results in the previous stage. The second one will be the validation of the constructive solutions in the chambers. At the beginning, the solutions will be tested in a scaled reverberation chamber that will be designed for this project with the near field holographic technique and a thermographic camera. Afterwards, the solutions will be tested in the transmission chamber and the reverberation chamber. These results will allow elaborating the technical sheets of textile materials for acoustic applications in construction.
  • Validation “in situ”: During validation phase, it will be expected to validate some of the developed textile material “in situ”, it means in a real industrial installation. These materials will be built into the walls, floors or ceilings. The third stage of the validation will allow knowing the real behaviour of the materials when they are installed and consequently we could know all the characteristics of the final demonstrative solution.
    Other phase to study and to develop in the project is related to the fire behaviour of the developed materials and constructive solutions because they must abide the specific laws and requirements related to the construction facilities.
    The results will help us to estimate if the designed materials can be included into the catalogue of constructive elements that some of the European States are developing. For example, in Spain, the publication of the “Código Técnico de la Edificación (Real Decreto 1371/2007, 19th October), has induced the creation of a catalogue of materials and constitutes a method to incorporate new materials that can be used in edification.

Expected results (outputs and quantified achievements):

This project intends to find a satisfactory and efficient demonstrative solution to reduce noise pollution in industrial areas, using finishing technologies in textile materials. The solutions will have to be validated in a real industrial installation.
The achievement of the final demonstrative solution implies a lot of partial results. The partial results from each phase of the project are very important in order to carry on the rest of the phases. The expected results are collected in the following statements:
  • To find textile materials with specific acoustic properties to begin working with them. It is planned to purchase between five and ten different base textile materials.
  • To characterize the acquired textile materials (acoustic properties and fire behaviour)
  • To improve the acoustic base-properties with finishing processes. It is expected to improve minimum 20% absorption coefficient in normal incidence.
  • To select the solutions which show the best results as acoustic materials. It is expected to work with between three and five different materials depending on the preliminary results. These materials will be validated, as it was mentioned previously
    with software simulations and chambers. It is necessary to work with big size of samples (9-13m2). We will expect to improve the lab results because in this case the absorption occurs in all directions not only at normal incidence.
  • At the same time, the selected solutions from the first stage have to improve their fire behaviour and they have to abide the requirement standards depending on the final application.