Thermal and acoustic insulation from PET bottles

Publisher
Tisková zpráva
24.03.2020 18:15
RETEX a.s.

The company Retex, a. s., has joined forces with universities and has come up with a new product in the form of two types of thermal and acoustic insulation made from synthetic fibers. The insulation, named ENVIZOL TB OH 26 and 50, is made from recycled materials and boasts exceptional utility properties.


The modern and dynamic company RETEX, a. s., with over 65 years of tradition, focuses on the development and production of non-woven textiles. Its products are primarily intended for the manufacture of components for the automotive industry and construction. The company exports its goods to Europe and overseas, and in addition to high-quality products, it also provides top-notch service to its clients.

Now, in collaboration with universities, it has developed thermal and acoustic insulation made from synthetic fibers – ENVIZOL TB OH 26 and ENVIZOL TB OH 50. Their production takes place on a modern line in Moravský Krumlov, and the main raw material processed is technological waste from the production of insulation made from polyester fibers from PET bottles. This is essentially a double recycling. Thanks to the careful selection of raw material – very fine fibers up to 2 dtex[1] without contamination from coarse fibers – the desired properties are achieved.
Thermal insulation board (TB OH 26) is a thermally bonded textile for thermal insulation applications in construction. It is composed of recycled polyester fibers and bicomponent polyester fibers referred to as BICO (which is a two-component polyester fiber with differing melting temperatures of each component). The fiber surface melts at approximately 110 °C and bonds adjacent polyester fibers. The core with a higher melting temperature (about 250 °C) remains stable. This property allows the polyester insulation fibers to bond together with long-term durability. This insulation has a very interesting diffusion permeability (µ = 1.5/2.2) and other exceptional properties.

Thermal and acoustically absorbing board (TB OH 50) is a nonwoven thermally bonded textile mainly for acoustic applications. It consists of 90% recycled polyester fibers and 10% BICO fibers.

Product Advantages

The advantages of these insulations are dimensional stability, flexibility (elasticity, strength, and resistance to deformation), and above all, low dust generation, which does not irritate the skin and respiratory system. These advantages apply not only to the installation phase but also to the actual use throughout the lifespan of the building.

The insulation is resistant to mechanical damage and contains no chemical binders. Moreover, it also withstands moisture – even in the event of structural failure or water damage, it is not necessary to replace the insulation, as the original properties remain intact. Its high resistance to vibrations is also remarkable, as it does not lead to settling of the insulation.

Usage

The product is manufactured in two bulk densities and thicknesses from 40 to 100 mm. Interior thermal insulation with a bulk density of 26 kg/m³ is primarily intended for civil construction. It can be used for insulating ceilings, walls, and partitions, including dry construction. For sound insulation inside buildings, insulation with a bulk density of 50 kg/m³ is suitable, characterized by its ability to absorb a wide spectrum of noise. Insulations are supplied in dimensions of 60 × 120 cm and should be stored in covered, clean, and dry areas.


[1] Unit of thread structure fineness: 1 tex means that 1 km of fiber has a weight of 1 gram. The fineness of chemical textile fibers is most often expressed in tenths of tex, thus in decitex: 1 dtex represents a fiber weighing 1 gram and measuring 10 km in length.
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