WO2016085333A1 - Élément absorbant acoustique et procédé de fabrication de cet élément - Google Patents

Élément absorbant acoustique et procédé de fabrication de cet élément Download PDF

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Publication number
WO2016085333A1
WO2016085333A1 PCT/NL2015/050818 NL2015050818W WO2016085333A1 WO 2016085333 A1 WO2016085333 A1 WO 2016085333A1 NL 2015050818 W NL2015050818 W NL 2015050818W WO 2016085333 A1 WO2016085333 A1 WO 2016085333A1
Authority
WO
WIPO (PCT)
Prior art keywords
mat
sound absorbing
absorbing element
perforations
areas
Prior art date
Application number
PCT/NL2015/050818
Other languages
English (en)
Inventor
Willem François Van Gilst
Martijn Jacobus De Koning
Antonius Adrianus Marinus De Vries
Original Assignee
Polytec Composites Nl B.V.
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 Polytec Composites Nl B.V. filed Critical Polytec Composites Nl B.V.
Priority to EP15830897.3A priority Critical patent/EP3224087A1/fr
Publication of WO2016085333A1 publication Critical patent/WO2016085333A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • 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
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0001—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular acoustical properties
    • B29K2995/0002—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular acoustical properties insulating

Definitions

  • the present disclosure relates to a sound absorbing element, production thereof, as well as use thereof, for example in an automotive environment.
  • the height h of the boxes 2 according to this prior art can be up to and even higher than 15 mm.
  • This structural height h results in disadvantages with respect to available space in a vehicle's motor compartment; sufficient room may not be available for such large boxes.
  • sound absorbing elements are provided according to several aspects of the present disclosure and in different embodiments, as well as methods for the production or manufacture of these sound absorbing elements, and further also another aspect of the present disclosure relates to the use of such sound absorbing elements.
  • a sound absorbing element comprising: a mat of sound absorbing material; a plurality of areas of the mat comprising or defining a depression, indentation, pit and/or draining through hole, where the mat has a locally reduced thickness and/or is pierced; water repellent substance; and perforations in the mat.
  • Areas, comprising or defining a depression, indentation or pit may be those where the mat has a locally reduced thickness.
  • the areas and/or the draining holes are expected achieve sound dampening through or in the depressions, indentations or pits and/or in or at the draining through holes.
  • the draining through holes may additionally secure that water or other fluid can be drained from a top surface of the sound absorbing element, which top surface may - in certain embodiments - be directed towards a noise source, such as the motor of a motor vehicle.
  • a noise source such as the motor of a motor vehicle.
  • the areas in the mat of sound absorbing material of the sound absorbing elements define indentations or pits with respect to the original and/or surrounding thickness of the mat outside of the indentations or pits.
  • the mat can be formed by a plate, which can be anticipated to be more rigid than a mat. In these pits, sound waves are sufficiently damped.
  • the areas, defining such depressions, indentations or pits are not necessarily areas with a reduced thickness and an associated higher density, but the depressions, indentations or pits may be formed at production of the mat, or plate, of sound absorbing material.
  • the perforations contribute to the sound absorbing properties of the sound absorbing element. It is anticipated that is because of the effect of the perforations on the mechanical properties of the mat, and/or the sound absorbing channels formed thereby, for further absorption of sound. Surprisingly, this further increase in sound absorption is not hampered by the provision of the water repellent substance or material, which in turn contributes to longer resistance against water or other fluid from penetrating into the mat.
  • the water repellent may be in or coated on the mat of sound absorbing material, but the marked improvement in sound absorbing brought about by the perforations is maintained even while the water repellent is added to the sound absorbing element.
  • Such perforations can have a dimension of at least approximately 1 ⁇ or less up to several mm. It has proven possible for the skilled person to determine, if necessary through trial and error, a dimension of the perforations, at which water and/or other fluids do not flow into such perforations.
  • the areas and the indentations or pits associated therewith have considerably larger dimensions, for example from several mm up to approximately at least 2 - 3 cm.
  • an embodiment of this aspect of the present disclosure may exhibit the feature that at least some of the plurality of areas define a bulge relative to a surface of the mat or a depression.
  • the indentation or pit may thus be confined to the thickness of the mat, or - as in this embodiment - form a bulge, preferably in a mat surface opposite the noise source, like the engine of the motor vehicle.
  • an embodiment of this aspect of the present disclosure may exhibit the feature that at least some of the plurality of areas of the mat comprise a draining through hole. Then, preferably, at least some of the plurality of areas and at least some of the draining through holes coincide in position relative to the mat. Thereby the indentations or pits, associated with the area of the mat, can form collectors for fluid, which can then be conveniently discharged through the draining through holes in or at the areas of the mat.
  • an embodiment of this aspect of the present disclosure may exhibit the feature that the mat comprises foam material.
  • the foam material may be polypropylene foam, especially because the high temperature stability thereof, for instance at temperature in the region up to 140 °C or higher.
  • other materials may be employed with less, equal or more effect than polypropylene foam, such as polyamide, textile, LWT and the like.
  • an embodiment of this aspect of the present disclosure may exhibit the feature that the perforations are dimensioned in a size of between 1 ⁇ meter or less and several millimetres.
  • the objective is a size of the perforations that enables appropriate resistance against water penetrating into the mat or plate, supported and enhanced by the water repellent, while further enhancing sound absorbing properties.
  • an embodiment of this aspect of the present disclosure may exhibit the feature that the perforations are arranged from at least one surface of the mat towards an opposite surface. Then, preferably, the perforations stop short of penetrating through the entire thickness of the mat.
  • a method of producing a sound absorbing element comprising: providing a mat of sound absorbing material; providing water repellent; forming or compacting a plurality of areas of the mat, whereby the mat has a locally reduced thickness to form indentations, pits and/or draining through holes and/or is pierced; and arranging perforations in the mat.
  • an embodiment of this aspect of the present disclosure may exhibit the feature that compacting a plurality of areas of the mat comprises punching the mat to define in at least some of the plurality of compacted areas a bulge relative to a surface of the mat or a depression.
  • an embodiment of this aspect of the present disclosure may exhibit the feature that the mat comprises foam material, such as polypropylene foam.
  • an embodiment of this aspect of the present disclosure may exhibit the feature that the mat comprises micro-perforations.
  • a further aspect of the present disclosure relates to a use of a sound absorbing element, for example in an automotive environment, comprising producing the sound absorbing element of any one or more than one of the above described aspects related to elements, by way of a method of any one or more than one of the above described aspects related to methods, wherein the sound absorbing element is mounted to a structure, such as a motor vehicle.
  • Figures 1 and 2 respectively show a perspective view and a side view in the direction of arrow II in figure 1 , of a prior art sound absorbing element;
  • Figure 3 exhibits (a step of) the method of production or manufacture of the sound absorbing element, wherein both the method and the sound absorbing elements are embodiments of the present disclosure in a first aspect;
  • Figure 4 exhibits (a step of) the method of production or manufacture of the sound absorbing element, wherein both the method and the sound absorbing elements are embodiments of the present disclosure in a second aspect;
  • Figure 5 exhibits an additional optional step of the method of production or manufacture of the sound absorbing element, to follow the step of either or both of figures 3 and 4;
  • Figure 6 exhibits an alternative step of the method relative to figure 3;
  • Figure 7 exhibits a sectional view of a sound absorbing element, resulting from the method according to Figure 6;
  • Figure 8 exhibits an alternative embodiment or aspect of the method according to the present disclosure, wherein specific elements or features are combined from figures 4 and 6;
  • Figure 9 exhibits a sectional view of a sound absorbing element, resulting from the method according to Figure 8.
  • Figure 10 exhibits a perspective view of an element resulting from the method that is schematically depicted in Figure 4;
  • Figure 11 exhibits a sectional view along arrow XI in figure 10, and further indicating a sound dampening effect thereof on impinging sound waves;
  • Figure 12 exhibits a perspective view of an element resulting from the method that is schematically depicted in Figure 3;
  • Figure 13 exhibits a sectional view along arrow XIII in figure 12, and further indicating a sound dampening effect thereof on impinging sound waves;
  • Figure 14 shows a car or motor vehicle, implying a field of use of sound absorbing elements, to which the present disclosure is directed;
  • Figure 15 exhibits of perspective view on an underside of a car in the direction of arrow XV in Figure 14, in which underneath a motor compartment a sound absorbing element according to the present disclosure is provided.
  • a mat 10 of sound absorbing material is provided on a support 11.
  • the mat 10 of sound absorbing material can be a foam material, in particular preferably polypropylene foam. Other materials than polypropylene may also prove to be applicable.
  • a punch 12 is arranged opposite the support 11 and arranged for a reciprocating movement along arrow A. When reciprocatingly moved along arrow A, punch 12 forms an indentation 13 in the mat 10.
  • a lance 14 is employed to go through a reciprocating movement along arrow B and pierce a draining through hole 15 in the compressed or compacted area of the mat 10.
  • lance 14 will be arranged to pierce draining through hole 15 before compacting an area of mat 10 using punch 12. In this case, lance 14 will penetrate through mat 10 at a location, where no indentation 13 is formed yet. If, subsequently, punch 12 is employed to form indentation 13 of compacted mat material, punch 12 may be centred on draining through holes 15 that have previously been arranged in mat 10 by lance 14. However, punch 12 and lance 14 may alternatively be employed at different locations, but preferably indentations 13 and draining through holes 15 would be positioned to coincide.
  • the punch 12 and lance 14 may be formed in one element or component, to punch the indentation 13 in the mat 10 and simultaneously pierce the mat 10 to define the draining through holes, as indicated in figure 8.
  • the step of providing draining through holes 15 according to figure 4 can be omitted. Fluid repelling properties of the mat 10 are enhanced by including water repellent material or substance. Omission of draining through holes would result in a sound absorbing element 16, depicted in figures 12 and 13. In particular in figure 13, a schematic representation is depicted on the manner in which sound waves G are damped. Such damping may be sufficient to realise predetermined requirements.
  • the step of compacting mat material of figures 3 may be omitted, provided draining through holes 15 provide sufficient sound damping, which would result in the sound absorbing element 17 as shown in figures 10 and 11.
  • a mechanism of damping sound waves G is schematically shown, were such damping is at least partially performed within channels that are defined by the draining through holes 15.
  • FIG 5 it is schematically shown that needling can be performed.
  • needles 18 having a diameter of anywhere between 1 ⁇ meter or less and several millimetres
  • reciprocating penetration of needles 18 in the direction of either arrow C or arrow D can provide small perforations running from top surface 19 or bottom surface 20 of mat 10 into the interior of mat 10.
  • Any alternative manner of providing the perforations is equally applicable, for example using a laser.
  • Such perforations are preferably arranged not to penetrate and pierce through the entire thickness of mat 10, although it is not excluded from the scope of protection for the present disclosure that the perforation may form through holes.
  • plate 21, 22 can carry needles 18 to subsequently or simultaneously perform needling from above the top surface 19 or below bottom surface 20 of mat 10. It should be noted here, that needling from only above or only from below mat 10 is also possible.
  • Figures 6 and 7 exhibit an embodiment, wherein compacted areas of mat 10 can be formed or shaped to define a bulge 23, preferably though not exclusively at a surface opposite a noise source, which is schematically represented by arrow G.
  • support 11 is provided with pits 24, where a punch plate 25 carries a plurality of punches 12 and each of the punches 12 has a sufficient length or depth to be driven and retracted in the direction of arrow E into and out of mat 10 to compress or compact an area of mat 10 and simultaneously generate bulges 23 at locations corresponding with indentations 13.
  • the sound absorbing element 26 is produced to have both indentations 13 and draining through holes 15, at essentially coinciding locations over the surface of mat 10.
  • this can be achieved by using the carrier plate 25 with punches 12 of figure 6, augmented with piercing lances 14 from figure 4.
  • punches 12 with lances 14 can be driven into, respectively through mat 10, to which end support 11 can be provided with accommodations 27 to accommodate lances 14 when driven along arrow F.
  • the accommodations 27 may include pits 24 in support 11, like the embodiment of figure 6.
  • singular punches 12 combined with singular lances 14 can also be employed, but this would increase the need for repeating punching penetrations in the directions of arrows A and B from figures 3 and 4.
  • Figures 14 and 15 schematically represent an application or use of the sound absorbing element in a motor vehicle, at the position indicated by arrow XV in figure 14, or figure 15 shows that such a sound absorbing element 29 can be employed as a cover at or over a motor
  • sound absorbing element 29 should preferably not allow impregnation or penetration of fluids, as this would result in deterioration of the sound absorbing properties thereof, and could also affect the structural integrity of the sound absorbing element 29.
  • the expression that the mat is compacted does not necessarily mean that the a local increase in density is required, but in contrast that a locally thinner portion is provided, to define a depression or the like, relative to a surrounding thickness of the mat or plate.
  • circular depressions are defined in the above described embodiment, referring to the appended figures, any other shape in frontal view on the mat or plate may also be realised, such as: triangular; pentagram, honeycomb, elliptical and the like.
  • the draining through holes in that these can have one of a variety of cross sectional shapes.
  • the mat does not need to be a mat, but can be a plate or the like.
  • the material of the mat or plate does not necessarily have to be a foam, or even polypropylene foam, but a textile or plate or polyamide or LWT, et cetera, is likewise possible. Further the mat or plate is impregnated or coated using a water repellent substance, to increase the time before liquid penetrates into the mat or plate.
  • the dimensioning of draining through holes, depressions, indentations and pits and/or the density thereof in relation to a spread thereof over the area occupied by the mat or plate can be designed to be optimised for specific and/or even selected frequency ranges of sound or noise, originating from - for example - the motor of a motor vehicle, in which the sound absorbing element according to the present disclosure may be employed.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)

Abstract

La présente invention concerne un élément absorbant acoustique, sa fabrication, ainsi que son utilisation, par exemple dans un environnement automobile.
PCT/NL2015/050818 2014-11-25 2015-11-24 Élément absorbant acoustique et procédé de fabrication de cet élément WO2016085333A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15830897.3A EP3224087A1 (fr) 2014-11-25 2015-11-24 Élément absorbant acoustique et procédé de fabrication de cet élément

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2013875 2014-11-25
NL2013875A NL2013875B1 (en) 2014-11-25 2014-11-25 Sound absorbing element, and method of production thereof.

Publications (1)

Publication Number Publication Date
WO2016085333A1 true WO2016085333A1 (fr) 2016-06-02

Family

ID=53015858

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2015/050818 WO2016085333A1 (fr) 2014-11-25 2015-11-24 Élément absorbant acoustique et procédé de fabrication de cet élément

Country Status (3)

Country Link
EP (1) EP3224087A1 (fr)
NL (1) NL2013875B1 (fr)
WO (1) WO2016085333A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4150186A (en) * 1976-07-21 1979-04-17 Nissan Motor Company, Limited Composite board structure and a method of and an apparatus for producing the board structure
US5744763A (en) * 1994-11-01 1998-04-28 Toyoda Gosei Co., Ltd. Soundproofing insulator
JPH10182865A (ja) * 1996-12-25 1998-07-07 Sekisui Chem Co Ltd 床用防音シート
WO2001057328A2 (fr) * 2000-02-04 2001-08-09 Acoustics Research Limited Panneau absorbant les sons
US6720069B1 (en) 1999-01-14 2004-04-13 Nichias Corporation Sound absorbing structure
JP2005208599A (ja) * 2003-12-26 2005-08-04 Takayasu Co Ltd 撥水性吸音材およびそれを用いた車両用内装材
WO2012156416A1 (fr) * 2011-05-16 2012-11-22 Sealed Air Corporation Structure de mousse composite et procédé de production d'une structure de mousse composite

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4150186A (en) * 1976-07-21 1979-04-17 Nissan Motor Company, Limited Composite board structure and a method of and an apparatus for producing the board structure
US5744763A (en) * 1994-11-01 1998-04-28 Toyoda Gosei Co., Ltd. Soundproofing insulator
JPH10182865A (ja) * 1996-12-25 1998-07-07 Sekisui Chem Co Ltd 床用防音シート
US6720069B1 (en) 1999-01-14 2004-04-13 Nichias Corporation Sound absorbing structure
WO2001057328A2 (fr) * 2000-02-04 2001-08-09 Acoustics Research Limited Panneau absorbant les sons
JP2005208599A (ja) * 2003-12-26 2005-08-04 Takayasu Co Ltd 撥水性吸音材およびそれを用いた車両用内装材
WO2012156416A1 (fr) * 2011-05-16 2012-11-22 Sealed Air Corporation Structure de mousse composite et procédé de production d'une structure de mousse composite

Also Published As

Publication number Publication date
EP3224087A1 (fr) 2017-10-04
NL2013875B1 (en) 2016-10-11

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