EP1544846A2 - Matériau alvéolaire plat insonorisant - Google Patents

Matériau alvéolaire plat insonorisant Download PDF

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Publication number
EP1544846A2
EP1544846A2 EP04029672A EP04029672A EP1544846A2 EP 1544846 A2 EP1544846 A2 EP 1544846A2 EP 04029672 A EP04029672 A EP 04029672A EP 04029672 A EP04029672 A EP 04029672A EP 1544846 A2 EP1544846 A2 EP 1544846A2
Authority
EP
European Patent Office
Prior art keywords
sound
foam material
layer
foam
elevations
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.)
Granted
Application number
EP04029672A
Other languages
German (de)
English (en)
Other versions
EP1544846B1 (fr
EP1544846A3 (fr
Inventor
Juergen Roellinghoff
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.)
Cellofoam GmbH and Co KG
Original Assignee
Cellofoam GmbH and Co KG
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 Cellofoam GmbH and Co KG filed Critical Cellofoam GmbH and Co KG
Priority to PL04029672T priority Critical patent/PL1544846T3/pl
Publication of EP1544846A2 publication Critical patent/EP1544846A2/fr
Publication of EP1544846A3 publication Critical patent/EP1544846A3/fr
Application granted granted Critical
Publication of EP1544846B1 publication Critical patent/EP1544846B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general

Definitions

  • the invention relates to a sound-absorbing, sheet-like or layered foam material, in particular for lining soundproof hoods and housings, Hoods and the like.
  • foam layer can by melting a have microporous surface layer.
  • the sound absorption effect of such foam linings depends in addition to material properties and structure of the absorber above all from the thickness of the foam layer.
  • the purpose of sound absorption is to obtain the highest possible sound from the incident sound wave Dissipate or absorb energy components.
  • the highest energy level of a sound wave is in the range of maximum amplitude, d. H. the vertical vibration of the air particles perpendicular to the propagation direction, which is highest at ⁇ / 4 and 3 ⁇ 4 ⁇ .
  • a sound frequency of 1000 Hz the result is a wavelength considering the speed of sound 0.33 m, with maximum amplitude occurring at 8 and 24 cm, respectively.
  • the invention is based on the object, the sound absorption effect in a layered Significantly improve foam material without increasing the layer thickness got to.
  • Fig. 1 shows schematically a cross section through a layer 1 of polyurethane foam, the represents a porous absorber and an average layer thickness of, for example 15 mm has.
  • the distance of the elevations 1a may be, for example, about 50 mm and the height difference to a recess 1b about 10 to 12 mm. This surface structure results compared to a foam layer of 15 mm thickness with a flat surface about a doubling the sound swallow area.
  • This surface layer 1 c denotes a surface layer of the foam layer, which is melted and burning about 2 to 3 mm of the foam material formed on the surface For example, apply a hot roller under pressure over the foam layer is rolled off. This results in a largely closed surface of the combustion residues of the foam material, in particular polyurethane, but microporous is.
  • This surface layer 1 c acts as a vibratory membrane and can be a Thickness in the range of 10 to 15 ⁇ have.
  • This microporous surface layer or skin 1c is permeable to air, but not for Water or oil, because of the surface tension of liquids.
  • imprints are preferably provided, which are the surface for the incident sound magnify and amplify diffraction effects of the sound.
  • Fig. 3 shows the absorption coefficient with diffuse sound incidence in dependence from the frequency.
  • All incidence angles occur in diffuse sound fields on.
  • the surface structure of Fig. 1 gives an optimal average angle of incidence. Due to the mostly oblique sound incidence on the surface occur almost wall-parallel components of the sound amplitude, where the longitudinal extent the foam layer comes into action, making these components look like a very thick foam layer can be effectively absorbed.
  • sound absorption values achieved the on the only by the layer thickness computationally achievable sound absorption effect go clearly and otherwise only with multiple layer thicknesses of a conventional planar Foam material can be achieved.
  • These high sound absorption values become supported by occurring diffraction effects on the indentations 1d, preferably in Diamond structure are provided on the surface.
  • Fig. 2 shows the sound absorption of inventively designed foam layers at different average thickness dimensions depending on the Sound frequency. So it is at an average layer thickness of 30 mm and 630 Hz Absorption value ⁇ reached over 1.0, where 1.0 corresponds to 100%. For such an absorption value is in a foam layer of uniform thickness, ie without the inventive Wavy structure of the microporous surface, a layer thickness of 130 mm needed.
  • FIGS. 4 and 5 The practical significance of such absorption values is illustrated by FIGS. 4 and 5.
  • Fig. 4 shows the sound level decrease as a function of the sound absorption coefficient ⁇ .
  • Fig. 5 reflects the subjective perceived volume reduction. After that, z. Legs Sound level reduction of 5 dB at a sound level of 60 dB already a volume reduction for the human ear of 29%.
  • the back of the foam layer 1 may be coated with a reinforcing material be. It may also be self-adhesive to facilitate attachment to a wall.
  • the distance of the flat elevations 1a can be varied, as well as the height between increase and depression. So the distance between the elevations 1a 40-60 mm, in particular 45-55 mm.
  • the height between increase and recess can be 8 - 15 mm. In special cases, a distance Increases of up to 100 mm can be used.
  • one is possible flat surface structuring provided the disadvantages of partially low volume density and thus to avoid worse absorption.
  • the wavy surface structure is independent of the layer thickness of the used Foam.
  • the wavy surface texture becomes designed so that at the lowest possible tread depth enlargement of the Surface of about 180 - 250% is achieved.
  • FIG. 1 with a distance of the elevations of 50 mm and a difference between increase and depression from 10 to 12 mm results in about a doubling of the surface or an increase the surface of about 200%.
  • the section line in Fig. 1 follows approximately a sinusoid. But it is also possible, for example, deepen the depressions and make the elevations wider than the depressions. It is essential that flat dome-shaped elevations 1a and also the recesses 1b rounded so flat are concave designed that results in a steady change in inclination of the surface.
  • the described surface structure results in different types of foam material to a significant improvement of the sound absorption effect.
  • polyurethane ester which is about 40% has open cell and about 60% closed-cell structure.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)
EP20040029672 2003-12-15 2004-12-15 Matériau alvéolaire plat insonorisant Expired - Lifetime EP1544846B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04029672T PL1544846T3 (pl) 2003-12-15 2004-12-15 Pochłaniający dźwięk płaski materiał z tworzywa piankowego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10358595A DE10358595A1 (de) 2003-12-15 2003-12-15 Schallabsorbierendes flächiges Schaumstoffmaterial
DE10358595 2003-12-15

Publications (3)

Publication Number Publication Date
EP1544846A2 true EP1544846A2 (fr) 2005-06-22
EP1544846A3 EP1544846A3 (fr) 2012-11-28
EP1544846B1 EP1544846B1 (fr) 2015-04-22

Family

ID=34485379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040029672 Expired - Lifetime EP1544846B1 (fr) 2003-12-15 2004-12-15 Matériau alvéolaire plat insonorisant

Country Status (7)

Country Link
EP (1) EP1544846B1 (fr)
DE (1) DE10358595A1 (fr)
DK (1) DK1544846T3 (fr)
ES (1) ES2543083T3 (fr)
HU (1) HUE025109T2 (fr)
PL (1) PL1544846T3 (fr)
PT (1) PT1544846E (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108231053A (zh) * 2018-03-13 2018-06-29 吉林大学 一种具有凸包形态的声学包装材料及其制备方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2246621A1 (de) * 1972-09-22 1974-03-28 Albert Schrey Akustikplatte
DE2915823A1 (de) * 1979-04-19 1980-11-06 Irbit Holding Ag Schall-daemmplatte
DE3219339C1 (de) * 1982-05-22 1983-02-03 Metzeler Schaum Gmbh, 8940 Memmingen Flaechiges Element zur Luftschall-Absorption
DE3313001A1 (de) * 1983-04-12 1984-10-18 Volkswagenwerk Ag, 3180 Wolfsburg Schallabsorbierende schicht

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108231053A (zh) * 2018-03-13 2018-06-29 吉林大学 一种具有凸包形态的声学包装材料及其制备方法

Also Published As

Publication number Publication date
HUE025109T2 (en) 2016-01-28
EP1544846B1 (fr) 2015-04-22
EP1544846A3 (fr) 2012-11-28
DK1544846T3 (en) 2015-07-27
PT1544846E (pt) 2015-09-14
PL1544846T3 (pl) 2015-10-30
DE10358595A1 (de) 2005-07-21
ES2543083T3 (es) 2015-08-14

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