Sound Insulation

Automotive: reinforcement for sound insulation

For sound insulation, car manufacturers and automotive suppliers use sound-absorbing moulded parts made from heavy foam or bitumen. These are installed where only an extremely flat design is possible, such as under the bonnet or the headliner. Some spaces are difficult to reach or only accessible during assembly (e.g. between the door panel and the lowered window). Depending on the vehicle class, sound-damping elements are also used:
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• In the A, B, C and (in estate cars and vans) D pillars
• In boot lids
• On the inside of wings
• As bulkhead insulation between dashboard and engine compartment
  (front-engined vehicles) or between interior and rear engine
• Between carpet and floor pan
• On the transmission tunnel (especially in rear-wheel-drive vehicles)

Reinforcement for parcel shelves, headliners and impact protection

BAFA^® laid scrims are also used to reinforce headliners and parcel shelves, with the focus on improving dimensional stability and torsional rigidity. Another application is impact protection mats for car doors in tight garages.

What are laid scrims?

Laid scrims are lightweight structures made from yarns, a form of technical textile that differs significantly from
conventional woven fabrics:

• The yarns are not interlaced over and under each other. A binder bonds them
  firmly together at their contact points.
• The yarns run diagonally / multiaxially in 6 to 10 directions.
  As a result, they absorb acting forces much more effectively.
• They are more stable and at the same time more flexible.
• Their higher structural tear strength allows wider meshes and a significantly lower weight per unit area.
• Different materials can be combined, each with its specific properties.
• The yarns can be treated with a wide range of impregnations for specific purposes.

What are laid scrims?

Laid scrims are lightweight structures made from yarns, a form of technical textile that differs significantly from
conventional woven fabrics:

Processing in automated production

In automotive assembly, every second counts. BAFA^® laid scrims save automotive suppliers time in converting. There are three ways to process them:

• As an intermediate layer
• Bonded to the later contact surface (e.g. the body panel)
• As part of double-sided adhesive tapes

BAFATEX supplies laid scrims wound on rolls, designed for automated production and high processing speeds. BAFA^® laid scrims are easy to cut and punch, making them suitable for both manual processing and die-cutting lines. In the final step, they speed up assembly and save time for your customers.

Material options

Depending on the properties required, the following materials are available:

• Natural fibres: jute, cotton and flax
• Man-made fibres
• Other materials on request

Glass fibre is the most widely used material for reinforcing sound insulation mats. Glass fibre or glass filament is particularly resistant to engine heat and very low outside temperatures, and offers a long service life under strong temperature fluctuations.

Typical construction for sound insulation mats: 6-directional, warp: 34 tex glass filament yarn, weft: 22 tex glass filament yarn.

Individually configurable

Several variables can be adjusted to tailor the reinforcement to your requirements:

• Material, material combinations and their properties (e.g. soft, hard, heat-sealable, waterproof, flame-retardant)
• Impregnation / adhesive
• Yarn count and yarn spacing
• Elongation at break (1.7–23 %)
• Breaking force (2.2–448 N)
• Tenacity (13–355 cN/tex)
• Yarn count and yarn spacing