EP1780317B1 - matériau fibreux isolant thermique et acoustique - Google Patents

matériau fibreux isolant thermique et acoustique Download PDF

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Publication number
EP1780317B1
EP1780317B1 EP05425754A EP05425754A EP1780317B1 EP 1780317 B1 EP1780317 B1 EP 1780317B1 EP 05425754 A EP05425754 A EP 05425754A EP 05425754 A EP05425754 A EP 05425754A EP 1780317 B1 EP1780317 B1 EP 1780317B1
Authority
EP
European Patent Office
Prior art keywords
yarn
layer
fibrous material
mat according
spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05425754A
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German (de)
English (en)
Other versions
EP1780317A1 (fr
Inventor
Gerado Ciro Esposito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Klevers Italiana Srl
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Klevers Italiana Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Klevers Italiana Srl filed Critical Klevers Italiana Srl
Priority to DE602005011824T priority Critical patent/DE602005011824D1/de
Priority to AT05425754T priority patent/ATE417953T1/de
Priority to EP05425754A priority patent/EP1780317B1/fr
Priority to SI200530607T priority patent/SI1780317T1/sl
Priority to ES05425754T priority patent/ES2321525T3/es
Publication of EP1780317A1 publication Critical patent/EP1780317A1/fr
Application granted granted Critical
Publication of EP1780317B1 publication Critical patent/EP1780317B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/34—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
    • D02G3/16—Yarns or threads made from mineral substances
    • D02G3/18—Yarns or threads made from mineral substances from glass or the like

Definitions

  • the present invention refers to a soundproofing and thermal insulating fibrous material (sometimes merely referred to as “soundproofing fibrous material” hereinafter) as well as to different applications and uses of such a fibrous material.
  • Sound absorbing soundproofing and thermal insulating fibrous material materials are widespread and are used in may different applications for which building materials for houses, etc., sound insulating walls, noise protections as well as aeronautic applications are examples.
  • a particular application is the use thereof in a silencer for an internal combustion engine.
  • the interspace between the exhaust pipe and the external covering is filled with a fibrous material which exhibits a soundproofing property.
  • U.S. Patent No. 3,488,670 describes a method and an apparatus for producing a bulky linear textile product of continuous filaments having a core portion of substantially linear, closely grouped filaments and groups of dispersed filaments in successive regions along the outside surface of the core portion extending outwardly in elongated undulatory waves.
  • the present invention provides a soundproofing fibrous material mat comprising at least one layer of spring yarns, each yarn being composed of a core yarn (1) and a second yarn (2) extending from the core yarn (1) in radial directions and being fixed to the core yarn (1) in irregular intervals, and said yarns being held together by a sewing yarn.
  • the used spring yarn is preferably such that it is obtainable by opening and blowing up a smooth yarn using compressed air jets, thus providing a fluffy yarn full of fibre loops.
  • the second yarn (2) has an average wave height (A) which is larger than the nominal diameter of the core yarn (1). It is further preferred that the second yarn (2) has an average wave height (A) of about 3 mm or more.
  • the fibers which form the second yarn (2) have a yarn count of about 100 tex or more. Further, the fibers which form the second yarn (2) preferably have a nominal diameter in the range of about 6 ⁇ m to about 24 ⁇ m.
  • the above soundproofing fibrous material mat can preferably be formed as a mat having at least two layers, wherein the spring yarns of a first layer are oriented in a direction intersecting the direction in which the spring yarns of a second layer are oriented.
  • This preferred soundproofing fibrous material mat may preferably comprise a third layer, wherein the spring yarns of said third layer are oriented in a direction intersecting the directions in which the spring yarns of said first and said second layer are oriented.
  • the layers are held together by a sewing yam.
  • a preferred minimum nominal thickness of all layers in total, e.g. of the aforementioned two or three layers, is 12 mm.
  • a preferred nominal weight of the respective layers is 600 g/m 2 .
  • the invention further provides a silencer according to claim 10.
  • the soundproofing fibrous material mat according to the present invention comprises a spring yarn as it is shown in Figures 1 to 3 .
  • This spring yarn is composed of a core yarn (1) and a second yarn (2) extending from the core yarn (1) in radial directions and being fixed to the core yarn (1) in irregular intervals.
  • Figure 1 shows schematically in one dimension how the second yarn (2) is fixed to the core yarn (1) in irregular intervals.
  • Figure 2 shows that the second yarn (2) does not only extend from the core yarn (1) in one direction (or within a single plane only), but that the second yarn (2) can extend from the core yarn (1) in several different radial directions so that it extends into the entire radial space surrounding the core yarn (1).
  • FIG. 3 is a cross-sectional view of the yarn depicted in Figure 3 . It can be seen that the second yarn (2) forms a looped periphery around the core yarn (1), thus forming the spring yarn.
  • the spring yarn can also be described as a texturized yarn which is obtainable by a texturizing process. Any texturizing process can be employed, as long as the characteristic geometry of the spring yarn of the present invention as described above and as shown in Figure 1 to 3 is obtainable.
  • a smooth gam is opened and blown up using e.g. compressed air jets, thus creating a fluffy yarn full of fibre loops.
  • the soundproofing fibrous material according to the present invention preferably has the form of a mat.
  • a mat as understood herein can be described as a layer or a stacking of layers which are formed of spring yarns as described above. Within such a layer, the spring yarns can be aligned basically in parallel to each other. It is to be understood that it is mainly the direction in which the core yarn (1) runs, which determines the direction of the orientation of the yarns in such a layer.
  • the present invention further provides a silencer for an internal combustion engine.
  • the fibrous material according to the present invention in the form of a mat, fills most of or even the entire interspace between an exhaust pipe, which is covered by the silencer, and an external covering of the silencer.
  • the fibrous material is preferably inserted during the production of the silencer into the interspace between the exhaust pipe and the external covering.
  • the external covering can for example be made of aluminium, carbon, titanium, steel or any other suitable material.
  • the soundproofing fibrous material according to the present invention comprises a spring yarn which is composed of a core yarn (1) and a second yarn (2) extending from the core yarn (1) in radial directions and being fixed to the core yarn (1) in irregular intervals.
  • This arrangement of the spring yarn advantageously improves the soundproofing performance of the fibrous material compared to a material made from smooth yarns alone.
  • the soundproofing fibrous material according to the present invention preferably comprises the core yarn (2) and a second yarn which is fixed to the core yarn (1) in such a manner that a second or multi-waved yarn (2) is formed which has an average wave height (A) which is larger than the nominal diameter of the core yarn (1).
  • the average wave height can for example be controlled by putting the yarn on a graph paper and using a transparent glass to press the yarn onto it.
  • the average wave height (A) is about 3 mm or more.
  • waves are fixed on the core yarn (1) in the length direction of the latter so that they actually support the core yarn (1) which improves the latter's stability.
  • the average wave height (A) of about 3 mm or more further improves the sound absorbance of the fibrous material compared to the case that the average wave height (A) is below about 3 mm.
  • the undulated or multi-waved structure of the multi-waved yarn (2) is such that the average wave height (A) is about 3 mm or more and that the average wave width (B), that is the average width between two points at which the multi-waved yarn is fixed to the core yam, is about 3 mm or more.
  • the soundproofing ability of the fibrous material is further stabilized.
  • the respective arrangement can be further understood from Figure 1 in which reference numeral (1) denotes the core yarn and reference numeral (2) denotes the multi-waved yarn. Further, in Figure 1 (A) denotes the wave height and (B) denotes the wave width. While the above average values can be given, it is to be noted that the individual values of (A) and (B), respectively, can be highly irregular and can be distributed over a wide range.
  • Figure 2 also shows an embodiment of the yarn which is known from US 3,488,670 .
  • the multi-waved yarn (2) forms waves (or loops) not only in one direction, but the waves are formed in numerous different radial directions starting out from the core yarn (1).
  • Figure 3 represents a cross-section of the yarn depicted in Figure 2 .
  • This cross-section shows that waves are formed by the multi-waved yarn (2) in a multi-axial manner around the entire core yarn (1). It is currently assumed that this particular arrangement is one of the main reasons for the advantageously improved soundproofing property of the fibrous material of the present invention.
  • the core yarn (1) can either be formed by a single or a double yam.
  • the fibers which form the core yarn (1) preferably have a yarn count of about 100 tex or more in order to achieve a sufficiently robust fibrous material. Further, these fibers preferably have a nominal diameter in the range of about 6 ⁇ m or more to about 24 ⁇ m or less. It has been found that the nominal fiber diameter has a significant influence on the soundproofing property, which is optimized when the nominal diameter falls within the aforementioned range.
  • the second yarn or multi-waved yarn (2) is preferably made from fibers which have a yarn count of about 100 tex or more. It is also preferred that these fibers have a nominal diameter in the range of about 6 ⁇ m or more to about 24 ⁇ m or less.
  • At least one of the core yarn (1) and the multi-waved yarn (2) is made of glass fibers, aramid fibers, ceramic fibers, silica fibers, basalt fibers or carbon fibers, but is most preferably made of glass fibers because of their superior soundproofing properties. It is more preferred that both, the core yarn (1) and the multi-waved yarn (2), are made of the aforementioned specific kinds of fibers, wherein the best results are achieved when the core yarn (1) and the multi-waved yarn (2) are both made of glass fibers.
  • the glass material for the glass fibers is not specifically limited and one or more of the following can be used:
  • E-glass is most preferred because the sound absorbing properties of the inventive fibrous material are further improved when this kind of glass is employed.
  • Typical constituents of E-glass as used in the present invention include SiO 2 , Na 2 O, K 2 O, CaO, MgO, B 2 O 3 , Al 2 O 3 , F 2 , Fe 2 O 3 and others.
  • a specifically preferred composition of the E-glass is the following:
  • SiO 2 content in an employed glass beyond 57 wt.% SiO 2 , for example up to 94 wt.%, which allows for environmental temperatures of up to 900°C.
  • a glass having an increased SiO 2 -content preferably exhibits a melting point of up to about 1600°C.
  • a ceramic fiber preferably one made of a continuous filament.
  • Such a ceramic fiber preferably has a melting of up to about 1700°C. respective fibers can also be used in high-temperature applications in which temperatures of up to about 1700°C can occur.
  • An E-glass of the above composition allows for a well-controlled processing of the glass so that the specific structure of the yarn used in the present invention is easily achievable and the parameters thereof, like the above mentioned average values of (A) and (B), can be readily controlled.
  • the fibrous material according to the present invention is heat-resistant in a range of 60°C up to a temperature of about 200°C, i.e. no melting or cracking occurs up to about 200°C.
  • a heat-resistance at a temperature higher than 200°C, e.g. of up to 1200°C, which is for example achieved by the use of quartz fibers is also beneficial in some instances.
  • Such a heat resistance is favourable when the inventive soundproofing material is employed in environments of elevated temperature, specifically in automotive applications like e.g. as a filling material which is positioned in a silencer of an internal combustion engine.
  • a suitable production process for the inventive yarn is a production process in which a smooth yarn is treated with an air jet, preferably of compressed air, by which an undulated structure is achievable. That is, a fluffy yarn full of fibre loops with best insulation values is obtainable by this process. Also, according to such a process, it is possible to easily control the shape of the finally obtained yam, e.g. the aforementioned average wave height (A) and average wave width (B).
  • the mat according to the present invention can be described as a bulky yarn mat and exhibits superior soundproofing properties compared to mats which are produced from smooth yarns.
  • the mat can either be constituted by the inventive fibrous material alone, or can be mixed with other materials which are formed e.g. of synthetic or natural fibers.
  • the mat is compacted by and when it is wound around e.g. a perforated pipe or is for example held between 2 metal sheets so as to remain there.
  • the soundproofing fibrous material has been pre-pressed before assembly because in an actual application in which the material is used, empty spaces might be generated due to the temperature effects, and then these spaces are filled by the material as a result of the employed spring yam.
  • the mat is constituted by at least two (or more) layers.
  • Suitable sound proofing and thermal insulation properties are especially achieved with a preferred minimum nominal thickness of all layers of 12 mm in total. Similar results are achievable when the nominal weight of the respective layers is 600 g/m 2 , which is therefore also preferred.
  • Preferable mats according to the invention include or are exclusively formed by the following combinations of layers:
  • the mat is preferably a med-glass yarn mat which can be pressed. During its application, it can for example be pressed by the worker and filled in the parts where it shall be applied.
  • the foamed yarn mat according to the present invention is formed of one or more of the above described layers.
  • the spring yarn is held together by a sewing yarn which allows the operator to fill the mat into a desired equipment, for example into an exhaust gas pipe, exhaust gas silencers, air-intake silencer filters, sound absorbing pillows for gas turbine exhaust system, fire wall flexible blankets, sound absorbing quilted blankets and all the other application where sound and heat has to be reduced.
  • a desired equipment for example into an exhaust gas pipe, exhaust gas silencers, air-intake silencer filters, sound absorbing pillows for gas turbine exhaust system, fire wall flexible blankets, sound absorbing quilted blankets and all the other application where sound and heat has to be reduced.
  • the fibrous material may simply be wound around the exhaust pipe, which allows for a simple and economic production of the silencer.
  • the fibrous material may be supplied pre-cut and/or pre-formed so that it can be quickly applied even by unskilled personnel.
  • the fibrous material may be blended with other materials in order to satisfy the specific requirements of the purchaser.
  • it may be blended with needled felt of low, medium or high density, so that it can be advantageously used at various temperatures of up to 1200°C.
  • the mat according to the invention is constituted by at least 2 layers, one of which is made of the fibrous material of the present invention and which must not be different in the direction of the orientation of the yarns forming the layers.
  • the different layers can for example also be differentiable by their composition and/or by their microscopic or macroscopic structure.
  • a fibrous material of the present invention having different physical or chemical characteristics such as fiber diameter, yarn count, etc. and other fibrous materials as well as solid materials like metals, wood, plastics, etc. can be used. If the second layer is made from a fibrous material, the at least two different layers can be joined by needling, thermal bonding, adhesives or the like.
  • the fibrous material mat of the present invention is especially suitable for use in soundproofing applications, i.e. as a soundproofing building material, a sound insulating wall, a noise protection or a soundproofing material which is used in aeronautic and space applications.
  • the inventive fibrous material can be used as a filling material in a silencer of an internal combustion engine.
  • the fibrous material preferably fills most of or even the entire interspace between an exhaust pipe, which is covered by the silencer, and an external covering of the silencer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Building Environments (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Thermal Insulation (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)

Claims (10)

  1. Mat en matériau fibreux thermiquement isolant et insonorisant comprenant au moins une couche de fils ressorts, chaque fil étant composé d'un fil d'âme (1) et d'un deuxième fil (2) s'étendant du fil d'âme (1) dans des directions radiales et étant fixé au fil d'âme (1) à intervalles irréguliers, et lesdits fils étant maintenus entre eux par un fil de couture.
  2. Mat selon la revendication 1, dans lequel le fil ressort peut être obtenu en ouvrant et en gonflant un fil lisse en utilisant des jets d'air comprimé, fournissant ainsi un fil duveteux rempli de boucles de fibres.
  3. Mat selon la revendication 1 ou 2, dans lequel le deuxième fil (2) a une amplitude moyenne (A) qui est supérieure au diamètre nominal du fil d'âme (1).
  4. Mat selon l'une quelconque des revendications 1 à 3, dans lequel le deuxième fil (2) a une amplitude moyenne (A) d'environ 3 mm ou plus.
  5. Mat selon l'une quelconque des revendications 1 à 4, dans lequel les fibres qui forment le deuxième fil (2) ont un numéro de fil d'environ 100 tex ou plus.
  6. Mat selon l'une quelconque des revendications 1 à 5, dans lequel les fibres qui forment le deuxième fil (2) ont un diamètre nominal dans la gamme d'environ 6 µm à environ 24 µm.
  7. Mat selon l'une quelconque des revendications 1 à 6, comprenant au moins deux couches, dans lesquelles les fils ressorts d'une première couche sont orientés dans une direction croisant la direction dans laquelle les fils ressorts d'une deuxième couche sont orientés.
  8. Mat selon la revendication 7, comprenant en plus une troisième couche, dans laquelle les fils ressorts de ladite troisième couche sont orientés dans une direction croisant les directions dans lesquelles les fils ressorts de ladite première et de ladite deuxième couche sont orientés.
  9. Mat selon la revendication 7 ou 8, dans lequel l'épaisseur nominale minimale de toutes les couches au total est de 12 mm et le poids nominal est de 600 g/m2.
  10. Pot d'échappement pour un moteur à combustion interne, dans lequel le mat en matériau fibreux selon l'une quelconque des revendications 1 à 9 est rempli dans un espacement entre un tuyau d'échappement, qui est couvert par le pot d'échappement, et un revêtement externe du pot d'échappement.
EP05425754A 2005-10-25 2005-10-25 matériau fibreux isolant thermique et acoustique Not-in-force EP1780317B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE602005011824T DE602005011824D1 (de) 2005-10-25 2005-10-25 Schall- und wärmedämmendes Fasermaterial
AT05425754T ATE417953T1 (de) 2005-10-25 2005-10-25 Schall- und wärmedämmendes fasermaterial
EP05425754A EP1780317B1 (fr) 2005-10-25 2005-10-25 matériau fibreux isolant thermique et acoustique
SI200530607T SI1780317T1 (sl) 2005-10-25 2005-10-25 Zvočnoizolacijski in toplotnoizolacijski vlaknast material
ES05425754T ES2321525T3 (es) 2005-10-25 2005-10-25 Material fibroso aislante termico y acustico.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425754A EP1780317B1 (fr) 2005-10-25 2005-10-25 matériau fibreux isolant thermique et acoustique

Publications (2)

Publication Number Publication Date
EP1780317A1 EP1780317A1 (fr) 2007-05-02
EP1780317B1 true EP1780317B1 (fr) 2008-12-17

Family

ID=36088275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05425754A Not-in-force EP1780317B1 (fr) 2005-10-25 2005-10-25 matériau fibreux isolant thermique et acoustique

Country Status (5)

Country Link
EP (1) EP1780317B1 (fr)
AT (1) ATE417953T1 (fr)
DE (1) DE602005011824D1 (fr)
ES (1) ES2321525T3 (fr)
SI (1) SI1780317T1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106515101B (zh) * 2016-11-09 2018-10-16 江苏工程职业技术学院 一种具有吸声特性的复合膜结构双层面料

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488670A (en) * 1966-05-18 1970-01-06 Owens Corning Fiberglass Corp Method and apparatus for yarn treatment
US3775228A (en) * 1971-06-08 1973-11-27 Owens Corning Fiberglass Corp Composite linear elements
US4932108A (en) * 1983-04-21 1990-06-12 Ppg Industries, Inc. Process for high speed bulking of glass fiber strands
ITNA20010011A1 (it) * 2001-02-13 2002-08-13 Klevers Italiana S R L Materiale fonoisolante e termoisolante caratterizzato dal volumizzaread una certa temperatura particolarmente adatto per essere utilizzato

Also Published As

Publication number Publication date
ATE417953T1 (de) 2009-01-15
DE602005011824D1 (de) 2009-01-29
EP1780317A1 (fr) 2007-05-02
ES2321525T3 (es) 2009-06-08
SI1780317T1 (sl) 2009-06-30

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