OFFICE DESIGN & INTERIOR ACOUSTICS
Working time is also living time. Therefore, a workplace has to foster concentration, but also radiate comfort. Only if we are comfortable, we can fully commit ourselves to our job. Versatile, individual office design is the watchword. In the rest area, in the meeting area, in open-plan offices and in factory buildings components which are both functional and appealing are in demand. fibercomfort® nonwovens offer this combination—made of the same fibres used in our clothing and yet so much more than a classic textile. Sandler's breathable and resilient nonwovens offer a high level of seat comfort in office chairs, whilst dimensionally stable nonwovens with their open pore structure efficiently dampen noise in suspended ceilings, partition walls or in textile wall coverings.
These products contribute a quiet working environment and enable the creation of customised room designs. Sandler nonwovens are easy-to-handle, kind to the skin and are odourless. They are resistant to moisture, UV light and flame, fulfilling the highest requirements for product safety, health and durability. As single-polymer textiles, they are recyclable, thus conserving valuable resources. Finishes such as printing or embossed designs, moulding or lamination increase fibre integrity whilst offering potential design features. With Sandler nonwovens your products will create a feel-good atmosphere in the workplace.
Health is our greatest asset; protecting it is Sandler’s philosophy. Using specific combinations of raw materials and manufacturing technologies, Sandler nonwovens actively contribute to furthering this objective. They may be made of polyester from recycled drinking bottles and even the single-polymer nonwovens used in our clothing styles are fully recyclable. Sandler does not employ any chemical additives in the manufacture of these materials and furthermore, they are odourless. These nonwovens therefore protect the health of converters and end-users alike.
In processing and using synthetic materials, various emissions may occur. Some examples of these are:
- total carbon emissions; measured according to the VDA 277 standard
- odours; for which the material is tested according to VDA 270-C3
- formaldehyde emissions; measured according to VDA 275. This substance may cause headaches, mucosal irritation or respiratory problems and can even trigger asthma or allergies upon long-term exposure.
- fogging—condensation on windows in vehicles generated by the aforementioned emissions; measured according to DIN 75201
Materials for a defined product are specially chosen to avoid these emissions, resulting in Sandler nonwovens falling below the accepted limits in all of these categories.
- Hygiene & wipes industry: These products are intended to protect the well-being of the user, while remaining virtually unobserved. Only high-quality base materials are selected to which rigorous criteria are applied in order to ensure a low level of emissions. Sandler applies no chemical additives to avoid the generation of unpleasant odours.
- Automotive industry: Sandler nonwovens do not release unpleasant or harmful emissions—designed for comfortable handling and long-term enjoyment.
- Filter media: In ventilation and air-conditioning systems Sandler nonwovens allow us to breathe freely without having odours and other emissions impairing the air quality.
- Insulation materials for construction: In buildings, low-emission Sandler nonwovens are an excellent alternative for people suffering from allergies, contributing to the preservation of the occupants' health.
- Acoustics in offices & home textiles: Sandler nonwovens are odourless and virtually free from formaldehyde*, rendering both workplace and our homes as real comfort zones.
In cooperation with our partners, Sandler also offers an anti-odour finish that eliminates odours, for example for nonwovens applied in vacuum cleaner bags.
* below the detection limit
Sound absorption describes the conversion of sound energy into heat. Materials featuring high sound absorption are excellently suited to sound insulation in construction or the automotive industry. Fibrous components such as nonwovens commend themselves to these applications owing to their porous structure. Fine fibres create a more or less flexible “fibre skeleton“, featuring a large inner surface. Sound is diffracted in numerous places, whereby sound waves are absorbed and dampened by the nonwoven. Their structure also makes nonwovens an ideal heat insulator.
Properties such as the material’s thickness, density, porousness and flow resistance determine the level of absorption. The measurement of sound absorption under random incidence is carried out in a reverberation room according to DIN EN ISO 354, or in a smaller alpha cabin. Sound absorption under vertical sound incidence can be determined according to DIN EN ISO 10534 in a Kundt's tube, or impedance tube. Sandler nonwovens are tested for their sound absorption properties in cooperation with external institutes.
Together with renowned partners from research and the automotive industry, Sandler developed a simulation tool, enabling the calculation of the required absorption level. New variants and products can be computer-simulated based on the required absorption profiles before the first trial production is undertaken. In this way, time and costs are saved and valuable resources conserved.
See also: Air-permeability
Flame-resistant products meet particular demands in the event of fire. Subjected to blaze, sparks or open fire, they do not catch fire immediately. When ignited, these structures do not continue to burn, but extinguish after a specific time.
Depending on the specific application and national regulations, various test standards apply:
- Automotive applications: DIN 75200, MV SS 302, PV 3357 and UL 94
- Filtration: The provisions regarding flame-resistance are laid down in DIN 53438 standard.
- Construction: Nonwovens for office fittings and mattresses used on ships and trains are evaluated according to DIN 4102 or DIN EN 13501 standards.
- Upholstered furniture: BS 5852 standard is decisive in this sector.
Our nonwovens are tested for flame-resistance in cooperation with external testing institutes.
STRUCTURE & SURFACE
The fibrous structure of nonwovens combined with diverse bonding technologies creates a multitude of different structures and surfaces, optimising and complementing function and efficiency of these materials depending on their respective application:
No plain surface is like the other. Depending on the requirements of the application, numerous “plain“ surfaces variants are available. A smooth / plain surface also characterises optimised surface integrity.
- Wipes: Smoothing the surface reduces linting. Furthermore, the nonwoven gains a more compact feel and becomes more stable due to a reduction in elongation.
- Automotive industry: Surface smoothing lends stability to the material and improves processability.
- Fashion: A well-bonded surface prevents fibres from penetrating the outer fabric.
Perforating or aperturing offers a specific method of surface structuring. It changes the material’s surface, giving the nonwoven a special design as well as additional functional properties. In wipes substrates perforation improves the cleaning effect: It enlarges the material’s surface area, enhancing its dust hold capacity.
Embossed nonwovens combine design and function. The material can be embossed with various motifs as a visual eyecatcher. In many cases, however, these designs also enlarge the nonwoven’s surface—a definite “plus” when it comes to dirt collection in wipes or absorbency in hygiene products. Multi-layer structures may be bonded via an embossing process, attaining adhesion between the layers without binders. Depending on the material and the utilised polymers these structures can be created thermally or by using hydro embossing. Visit our Design section for more details.
In offices or public spaces embossed acoustic components made of nonwovens may also offer a design feature.
Many Sandler qualities are available with end use oriented print motifs. Various designs for the hygiene and wipes industry emphasise the respective application. Visit our Design section and see for yourself or contact Sandler for your customised print design.
In technical applications such as filtration or construction, performance parameters such as the filter grade, relevant testing standards or the classification pertaining to thermal conductivity can be printed onto the material using inkjet printing upon special request of the customer.
Nonwovens can also be used in the form of composites consisting of several layers. Different nonwovens are combined with one another or with other materials. These multi-layered structures combine the diverse properties and functionalities into one product, fulfilling the highest quality standards. Multi-layer composites may also facilitate processing. The possible combinations are virtually unlimited:
- Hygiene industry: Multi-layer nonwovens combine several functions in one product, such as the transport and storage of fluids.
- Medical applications: Together with other materials nonwovens also function as padding for improved in use comfort, particularly in extended use.
- Wipes: In cosmetics and other applications the combination of fine and coarse layers improves the cleaning effect.
- Automotive & upholstered furniture: Multi-layer nonwovens facilitate processing and lend stability, for example to leather seats: when laminated onto the leather, they prevent overextension in use, thereby reducing unsightly creases in the seat.
- Filtration: Multi-layer composites lend stability to the products: Ceiling filters, for example, are rendered more stable by a polyester fabric laminated to the medium.
- Technical applications: Composites of nonwovens or with a multitude of other materials can increase the stability or even the resistance to heat, acids or other influences.
- Fashion: Lamination to nonwovens imparts optimum surface integrity and prevents pilling and fibre penetration.
Sandler nonwovens can be offered with different finishes to supplement functionality: for example with lotions, cleaning agents, an antibacterial finish or a flame-retardant finish to increase flame-resistance.
Nonwovens can be printed all-over or with detailed motifs using thermal transfer printing, digital printing, flexo printing or other established printing technologies.
- Hygiene & wipes industry: Print motifs emphasise the application and offer visual differentiation.
- Office design: Acoustic components for interior decoration can be printed to offer a design facet. Thermal transfer printing increases surface bonding and smoothes the nonwoven’s surface.
With the intention of improving the print result, the surface of Sandler nonwovens may also be pre-treated by roughening the fibres.
Adhesive coating can be applied on one or both sides of the nonwoven. In filtration for example, ceiling filter media are coated with an adhesive finish to facilitate processing in the end application. The coated parts are protected by a release film. Once this film is removed, the nonwoven can be used as intended. Pleatable filter media can be equipped with spacers made of hotmelt adhesive.
The nonwoven can also be pre-treated to enlarge the fibres’ surface to improve bonding with the adhesive.
To achieve adhesion between layers, as an eye catcher or for the selective deformation of voluminous materials: Sandler nonwovens are embossed for a variety of applications. They are well suited to both calender and ultrasonic embossing, frequently used for the hygiene industry. In the automotive sector, embossed nonwovens are also used for example in engine cover parts. Again Sandler nonwovens are ideally suited to the processes employed in this industry, such as hot and ultrasonic embossing.
Due to the thermoplastic properties of the selected polymers utilised Sandler nonwovens are mouldable and are able to match the contours of the component. In addition, the material can also be hardened through moulding.
- Automotive industry: Nonwovens are for example processed into 3D moulded parts such as headliners or wheel house liners.
- Interior design: Acoustically efficient moulded parts made of nonwovens are also making advances into interior design. One recent example: a designer lamp shade.
In the filtration industry nonwovens are generally pre-heated prior to pleating. Sandler nonwovens are well suited to this process.
The polymers used make Sandler nonwovens totally compatible with ultrasonic welding, high-frequency welding or thermal welding techniques.
- Automotive industry: Ultrasonic or high-frequency welding spots are used to fasten nonwovens to die-cut or cover parts.
- Filtration & hygiene industry: Multi-layer composites can be bonded using ultrasonic or high-frequency welding.
- Technical applications: Nonwovens for pipe insulation are sealed using common welding technologies.
Depending on the specific application, Sandler nonwovens can be laminated with different materials to produce multi-layer structures with multifunctional properties: for improved acoustic efficiency, hardening, greater stability, resistance to heat or for improving mechanical properties. In fashion, the nonwoven is bonded to the outer fabric, in hygiene products multi-layer structures combine reliable protection with comfort in use—the possibilities are virtually endless.
In the hygiene industry, nonwovens are frequently transported to the laminating line on a vacuum conveyor belt. This process poses specific demands on the material’s air-permeability and Sandler nonwovens provide these characteristics.