Using Nonwoven Hol
Using Nonwoven Hollow Fibers to Improve Car Interior Acoustic properties" "
بحث مشترك
ABSTACT
This research aims to produce nonwoven fabrics that can be used in car interior components (head liners, doors, side panels and trunk liners) to prevent noise from reaching the passenger compartment and therefore achieving comfort in the car interior. Two kinds of fibers were used, polyester and hollow polyester fibers, both of 6 denier, to produce three different fabrics of 100% polyester fibers, 75% polyester/25% hollow polyester fibers, and 55% polyester45% hollow polyester fibers. Four fabric weights were produced: 300, 400, 500 and 600 g/m2. All samples were bonded using thermal bonding technique. More results were reached and most samples have achieved the expected results for example, samples produced with high percentage of hollow fibers have recorded the highest rates of sound absorption whereas samples produced with 100% polyester fibers have recorded the lowest rates. It was also found that there is a direct relationship between weight per m2 and sound absorption efficiency. Samples produced with 55% polyester/45% hollow polyester fibers and 600 g/m2 have achieved the best results.
Noise in the car, noise has become serious environment pollution in our daily life and is an increasing public health problem , as noise can cause serious health effects such as hearing loss ,sleep disturbance , tiredness , cardiovascular and psychophysiologic problems and performance reduction .Therefore it is very important to control or reduce noise from traffic ,and in factories, offices and houses.
Nonwoven is employed as fabrics for different kinds of interior applications. The numerous applications of nonwoven in cars can be classified into functional or aesthetic but there is a third category- that of substitutes for other materials. Nonwoven can be made in a wide range of densities and different forms, the use of nonwoven is increasing because it offers great versatility and cost effectiveness . (10) Each vehicle requires about 20 m2 of nonwoven materials (11) which are used specially for insulation ,noise dissipation and as filter materials ….etc .Woven and knitted fabrics are also used in producing automotive fabrics but to a lesser extent compared to nonwoven fabrics .
The experimental work
In order to produce samples under study nonwoven technique was applied using cross-laid fiber orientation .Two kinds of textile materials were used polyester and hollow polyester fibers ,both of 6 denier , to produce three different fabrics, of 100 % polyester fibers , 75 % polyester / 25 % hollow polyester fibers and 55 % polyester / 45 % hollow polyester fibers . Four fabric weights were also produced 300 ,400 ,500,and 600 g/m2 .All samples were bonded using thermal bonding technique (hot air method )by adding a small proportion of low –melting point polyester fibers (about 15 % and melting point 110 0 c ).
Results and discussion
Results were also statistically analyzed for the data listed and relationships between variables were obtained.
Sound absorption efficiency test
It is clear that ,the increase in fabric weight improves the sound absorption efficiency of fabrics at both low and high frequencies . .
Air permeability test
The more hollow fibers the less air permeability the fabrics become ,for the same weight .This is because of that ,the increase in number of hollow fibers increases the air volume in the fabric
Fabric thickness test
It is obvious that there is a direct relationship between fabric thickness and its weight .
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