AU2018206578A1 - Silencer - Google Patents

Silencer Download PDF

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Publication number
AU2018206578A1
AU2018206578A1 AU2018206578A AU2018206578A AU2018206578A1 AU 2018206578 A1 AU2018206578 A1 AU 2018206578A1 AU 2018206578 A AU2018206578 A AU 2018206578A AU 2018206578 A AU2018206578 A AU 2018206578A AU 2018206578 A1 AU2018206578 A1 AU 2018206578A1
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AU
Australia
Prior art keywords
acoustic
thermoplastic
splitters
casing
silencer
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
AU2018206578A
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AU2018206578B2 (en
Inventor
Neil Savory
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.)
Elta Group Innovations Ltd
Original Assignee
Elta Group Innovations Ltd
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
Priority claimed from AU2017903515A external-priority patent/AU2017903515A0/en
Application filed by Elta Group Innovations Ltd filed Critical Elta Group Innovations Ltd
Publication of AU2018206578A1 publication Critical patent/AU2018206578A1/en
Assigned to Elta Group Innovations Limited reassignment Elta Group Innovations Limited Request for Assignment Assignors: NCS ACOUSTICS LIMITED
Application granted granted Critical
Publication of AU2018206578B2 publication Critical patent/AU2018206578B2/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • 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
    • G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
    • 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
    • G10K11/162—Selection of materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F24F2013/242—Sound-absorbing material

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Pipe Accessories (AREA)

Abstract

An acoustic silencer having one or more acoustic splitters 18 arranged within a casing 12, and providing passageways 22 allowing air to flow between an entrance 14 and an opposite exit end of the casing. Each acoustic splitter has a major C- surface 24 composed of a thermoplastic acoustic absorbing material with a non 'I uniform thread pattern; this material actsto attenuate, absorb, dampen and/or baffle Nl sound waves and/or vibrations propagating within the air flowing through the passageways 22. (Figure 1) r1

Description

Silencer
Technical Field [0001] Described embodiments relate generally to acoustic silencers, and more specifically, to acoustic silencers comprising acoustic absorbing materials. Some embodiments relate to acoustic splitters for use within such silencers and some embodiments relate to a methods of manufacturing acoustic silencers.
Background [0002] Acoustic silencers are duct elements that are arranged within airflow systems in order to attenuate sound within the airflow system. Silencers are most commonly utilized in order to reduce noise, typically from equipment such as fans and air handling units.
[0003] An acoustic silencer traditionally comprises a rectangular or cylindrical casing arranged within the ducting of an airflow system. The casing houses at least one, but sometimes a plurality of acoustic splitters that are arranged within the casing such that air flowing through the ducting, into the casing, is directed between the acoustic splitters.
[0004] An acoustic splitter typically comprises a frame that retains an acoustic absorbing material. The absorbing material is traditionally retained within the frame by means of a mesh plate or perforated metal facing. The perforated metal facing is required to support the weight of the absorbing material, while still allowing contact between the material and the air flowing through the casing.
[0005] Throughout this specification the word comprise, or variations such as comprises or comprising, will be understood to imply the inclusion of a
2018206578 16 Jul 2018 stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
[0006] Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present disclosure as it existed before the priority date of each of the appended claims.
Summary [0007] Some embodiments relate to an acoustic silencer comprising: a casing comprising a first open end and a second open end; and one or more acoustic splitters arranged within the casing, defining at least one passageway providing fluid communication between the first open end and the second open end; wherein the one or more acoustic splitters each comprise a major surface composed of a thermoplastic acoustic absorbing material comprising a nonuniform thread pattern; and wherein the major surface of the one or more acoustic splitters forms a wall of the at least one passageway to thereby make contact with fluid being conveyed through the at least one passageway.
[0008] The thermoplastic may be selected from one or more of polyester, polyethylene and polypropylene. The thermoplastic acoustic absorbing material may have a density of between about 14 kg/m3 and about 60kg/m3.
[0009] A reverse major surface of at least one of the one or more acoustic splitters may line at least part of an inner surface of the casing. At least one of the one or more acoustic splitters may comprise a frame configured to receive the thermoplastic acoustic absorbing material therewithin. The frame may comprise a retainer for retaining the thermoplastic acoustic absorbing material within the frame.
2018206578 16 Jul 2018 [0010] The one or more acoustic splitters may comprise a substantially rounded edge extending along at least part of an exposed edge of the acoustic splitter near an open end of the casing.
[0011] The casing may be substantially rectangular in shape with a plurality of spaced apart acoustic splitters defining the one or more passageways disposed therewithin. Each of the plurality of spaced apart acoustic splitters may extend along a length of the casing, and the one or more passageways may be defined between the major surfaces of neighbouring acousticsplitters.
[0012] The casing may be substantially cylindrical in shape and the one or more acoustic splitters may be substantially tubular in shape. The cylindrical acoustic silencer may further comprise an additional acoustic splitter disposed at least part way within the casing, which may be spaced apart from the one or more tubular acoustic splitters to define the passageway between the major surface of the one or more acoustic splitters and a major surface of the additional acoustic splitter.
[0013] Some embodiments relate to an acoustic splitter for an acoustic silencer, the acoustic splitter comprising: a body having a first major surface; a frame arranged to receive the body therewithin; and wherein at least part of the first major surface of the body is composed of a thermoplastic acoustic absorbing material comprising a non-uniform thread pattern.
[0014] The thermoplastic may be selected from one or more of polyester, polyethylene or polypropylene. The thermoplastic acoustic absorbing material may have a density of between about 14 kg/m3and about 60kg/m3.
[0015] The body may be either rectangular, tubular, or cylindrical in shape.
[0016] Some embodiments relate to a method of manufacturing an acoustic silencer comprising: providing a casing comprising a first open end and a
2018206578 16 Jul 2018 second open end; and arranging one or more acoustic splitters within the casing to define a passageway providing fluid communication between the first open end and the second open end; wherein the one or more acoustic splitters each comprise a major surface composed of a thermoplastic acoustic absorbing material comprising a non-uniform thread pattern; and wherein the major surface of the one or more acoustic splitters forms a wall of the at least one passageway to thereby make contact with fluid being conveyed through the at least one passageway.
[0017] The thermoplastic acoustic absorbing material may be manufactured by air-blowing molten threads of thermoplastic material onto a hot plate in order to produce the non-uniform thread pattern.
[0018] Some embodiments relate to a method of manufacturing an acoustic splitter for an acoustic silencer, the method comprising: providing a body having a major surface; providing a frame arranged to receive the body therewithin; and wherein at least part of the major surface of the body is composed of a thermoplastic acoustic absorbing material comprising a nonuniform thread pattern.
[0019] The thermoplastic acoustic absorbing material may be manufactured by air-blowing molten threads of thermoplastic material onto a hot plate in order to produce the non-uniform thread pattern.
Brief Description of Drawings [0020] Some embodiments will now be described by way of non-limiting examples with reference to the accompanying drawings.
[0021] Figure 1 shows a perspective view of an acoustic silencer in accordance with some embodiments;
2018206578 16 Jul 2018 [0022] Figure 2 shows a perspective view of a first open end of the acoustic silencer depicted in Figure 1;
[0023] Figure 3 shows a perspective view of a second open end of the acoustic silencer depicted in Figure 1;
[0024] Figure 4 shows a perspective view of a full-sized acoustic splitter in accordance with some embodiments;
[0025] Figure 5 shows a perspective view of a half-sized acoustic splitter in accordance with some embodiments;
[0026] Figure 6 shows a perspective view of a cylindrical acoustic silencer, in accordance with some embodiments; and [0027] Figure 7 shows a perspective view of a cylindrical acoustic silencer, comprising a cylindrical acoustic splitter, in accordance with some embodiments.
Description of Embodiments [0028] Some embodiments relate to an acoustic silencer which may be employed as a duct element within an airflow system. The acoustic silencer comprises a casing that houses one or more acoustic splitters. The one or more acoustic spitters comprise a thermoplastic acoustic absorbing material to attenuate, absorb, dampen and/or baffle sound waves and/or vibrations that propagate within the airflow flowing through the acoustic silencer.
[0029] The thermoplastic acoustic absorbing material comprise a randomised thread pattern, or a non-uniform thread pattern, such as an erratic non-uniform thread pattern. In some embodiments, the acoustic absorbing material may be manufactured through a process that involves air-blowing molten threads of thermoplastic material onto a hot plate in order to produce the non-uniform
2018206578 16 Jul 2018 thread pattern. This may result in a scattering of overlaying threads that have no uniform or identifiable pattern arrangement.
[0030] The erratic non-uniform thread pattern of the thermoplastic acoustic absorbing material - as opposed to the aligned and layered thread patterns that result from other methods of manufacture, such as carding - has been found to better support its own weight. This removes the requirement of providing structural support in the form of a perforated face plate or mesh plate in order to retain the acoustic absorbing material on the acoustic splitters. A further advantage of the non-uniform thread pattern is the relative reduction of fibre migration or fibre erosion, which may result from exposing acoustic absorbing materials to an airflow.
[0031] Referring now to the drawings, an acoustic silencer, in accordance with some embodiments, is generally indicated by reference numeral 10. In some embodiments, the acoustic silencer 10 may be employed as a duct element in an airflow system (not shown). Alternatively, the acoustic silencer 10, may be used as a standalone unit arranged as a noise filter between two rooms.
[0032] In some embodiments, the acoustic silencer 10 comprises a casing 12, having a first open end 14 and a second open end 16 to allow air to flow into, and out of, the casing 12. The casing 12 is configured to receive one or more acoustic splitters 18 within a chamber 20 defined by the casing 12. The one or more acoustic splitters 18 are arranged within the chamber 20 to define one or more passageways 22 through the casing 12, providing fluid communication between the first open end 14 and the second open end 16,. For example, the one or more acoustic splitters 18 may each comprise at least one major surface 24 arranged to form a wall of the one or more passageways 22.
[0033] The at least one acoustic splitter 18 comprises thermoplastic acoustic absorbing material 26, such as a sheet of thermoplastic acoustic absorbing material 26, arranged to be in contact with fluid such as air flowing through the
2018206578 16 Jul 2018 one or more passageways 22. For example, in some embodiments, the thermoplastic acoustic absorbing material 26 forms at least part of the major surface 24 of the acoustic splitter 18. The thermoplastic acoustic absorbing material 26 is configured to attenuate, absorb, dampen and/or baffle sound waves and/or vibrations propagating within the air flowing through the passageway 22. In some embodiments, the thermoplastic acoustic absorbing material 26 comprises a non-uniform thread pattern. The non-uniform thread pattern may also be described as erratic, unevenly dispersed, irregular, or inconsistent. The non-uniform thread pattern may be a randomised pattern. In some embodiments, the thermoplastic is selected from one or more of polyethylene, polypropylene and polyester.
[0034] In some embodiments, the thermoplastic acoustic absorbing material has a density of between about 14kg/m3and about 60 kg/m3. The thermoplastic acoustic absorbing material may have a density of between about 28kg/m3and about 50 kg/m3. In some embodiments, the density of the thermoplastic acoustic absorbing material may be selected based on a size of the acoustic splitters 18 and/or a size of the casing 12. The density of the thermoplastic acoustic absorbing material may impact the material’s ability to support its own weight. For this reason, in embodiments where larger acoustic silencers 10 comprise larger acoustic splitters 18, a higher density thermoplastic acoustic absorbing material 26 may be utilized.
[0035] In some embodiments, as shown in Figures 1 to 3, the casing 12 is substantially elongate or rectangular in shape with a plurality of spaced apart acoustic splitters 18 defining the one or more passageways 22 disposed therewithin, with each acoustic splitters 18 extending along a length of the casing 12. The one or more passageways 22 are defined between the major surfaces 24 of neighbouring acoustic splitters 18 and/or between inner surfaces 32 of the casing 12 and major surfaces 24 of neighbouring acoustic splitters 18. For example, each of the acoustic splitters 18 may comprises a panel of thermoplastic acoustic absorbing material 26. In some embodiments, the one
2018206578 16 Jul 2018 or more acoustic splitters 18 may be arranged to span a length of the chamber 20 of the casing 12. The acoustic splitter 18 may have the same longitudinal length as the casing 12.
[0036] In some embodiments, the acoustic splitter 18 comprises a frame 28 configured to receive the thermoplastic acoustic absorbing material 26. The frame 28 may comprise a retainer 30 for retaining and locating the thermoplastic acoustic absorbing material 26 on the frame 28. For example, as best seen in Figures 4 and 5, the frame 28 may include retainers 30 that comprise a strut or a bracket that span opposing edges of the frame 28.
[0037] In some embodiments, one or more of the acoustic splitter 18 may comprise a reduced thickness or half-sized acoustic splitter 18, as shown in Figure 5 or a full-sized acoustic splitter 18, as shown in Figure 4. For example, in some embodiments, half-sized acoustic splitters 18 are disposed on the inner surfaces 32 of the casing 12 and full- sized acoustic splitters 18 are disposed between within the chamber 20 of the casing 12. In some embodiments, a major surface 24 of an acoustic splitter 18 may partially or fully line the inner surface 32 of the casing 12.
[0038] In some embodiments, the acoustic splitter 18 may be shaped to regulate airflow into and within the one or more passageways 22. For example, the acoustic splitter 18 may comprise a substantially bevelled or rounded edge 34, which may be disposed at, or extend along at least a part of or all of an exposed face or edge of the acoustic splitter 18 at or near the first open end 14 of the casing 12. In some embodiments, the acoustic splitter 18 may comprise a tapered end (not shown), which may be disposed at, or extend along at least a part of or all of an exposed face or edge of the acoustic splitter 18 at or near the second open end 16 of the casing 12.
[0039] Referring now to Figure 6, there is shown an alternative embodiment of an acoustic silencer 100. The acoustic silencer 100 comprises a substantially
2018206578 16 Jul 2018 cylindrical casing 112, having a first open end 114 and a second open end 116 to allow air to flow into, and out of, the casing 112. The casing 112 is configured to receive an acoustic splitter 118 within a chamber 120 defined by the casing 112. The acoustic splitter 118 is arranged within the chamber 120 to define a passageway 122 through the casing 112, providing fluid communication between the first open end 114 and the second open end 116. For example, as shown in Figure 6, the acoustic splitter 118 may be substantially tubular and in some embodiments, may be disposed on or line an inner surface 132 of the cylindrical casing 112. In some embodiments, the acoustic splitter 118 is co-axial with and encased or surrounded by thecasing 112. In some embodiments, the acoustic splitter may take the form of a section of a tubular acoustic splitter. For example, two substantially c-shaped acoustic splitters may be arranged to line the inner surface of thecasing.
[0040] In some embodiments, as seen in Figure 7, acoustic silencer 100 may comprise a second or additional acoustic splitter 218. For example, the second acoustic splitter 218 may be substantially cylindrical and may be disposed at least part way, and in some embodiments, is fully received, within thecasing 112. The second acoustic splitter 218 may be spaced apart from the acoustic splitter 118 to define the passageway 122 between a major surface 124 of the acoustic splitter 118 and a major surface of the second acoustic splitter 224. In some embodiments, the acoustic splitter 218 is co-axial with and encased or surrounded by the acoustic splitter 118 and/or the casing 112.
[0041] In some embodiments, the acoustic splitter 118 is attached to the inner surface of the casing 112 by means of a bracket (not shown). The second acoustic splitter 218 may be located substantially centrally to a chamber 120 of the casing 112 and spaced away from the major surface 124 of the acoustic splitter 118 disposed on the inner surface 132 of the casing 112 by means of the bracket.
2018206578 16 Jul 2018 [0042] As discussed above, and similar to acoustic splitters 18, the acoustic splitter 118, 218 may comprise a thermoplastic acoustic absorbing material 126 having a non-uniform thread pattern. The thermoplastic acoustic absorbing material 126 is configured to attenuate, absorb, dampen and/or baffle sound waves and/or vibrations propagating within the air flowing through the passageway 22, 122.
[0043] In some embodiments, the casing 112 may comprise a coupling 136 for attaching the casing 112 to, and/or arranging the casing 112 within, the airflow system (not shown). The coupling 136 may be disposed at either or both of the first open end 114 and the second open end 116. In some embodiments, the casing 112 may be shaped similar to ducting common within the art, and the coupling 136 may comprise a flange for connecting the casing 112 to ducting.
[0044] In some embodiments, the acoustic splitter 18,118,218 may comprise a non-metal facing (not shown) disposed on a surface of the thermoplastic acoustic absorbing material 26, 126. In some embodiments, the non-metal facing is a scrim or stiffened facing. In embodiments, where the thermoplastic acoustic absorbing material 26 is disposed within a frame 28, the non-metal facing may be retained within the frame 28. In some embodiments, the nonmetal facing may be acoustically invisible and does not significantly impact sound waves or vibrations propagating within the air flowing through the casing 12, 112.
[0045] It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the above-described embodiments, without departing from the broad general scope of the present disclosure. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.

Claims (19)

1. An acoustic silencer comprising:
a casing comprising a first open end and a second open end; and one or more acoustic splitters arranged within the casing, defining at least one passageway providing fluid communication between the first open end and the second open end;
wherein the one or more acoustic splitters each comprise a major surface composed of a thermoplastic acoustic absorbing material comprising a non-uniform thread pattern; and wherein the major surface of the one or more acoustic splitters forms a wall of the at least one passageway to thereby make contact with fluid being conveyed through the at least one passageway.
2. The acoustic silencer of claim 1, wherein the thermoplastic is selected from one or more of polyester, polyethylene and polypropylene.
3. The acoustic silencer of either claim 1 or claim 2, wherein the thermoplastic acoustic absorbing material has a density of between about 14 kg/m3and about 60kg/m3.
4. The acoustic silencer of any one of the preceding claims, wherein a reverse major surface of at least one of the one or more acoustic splitters lines at least part of an inner surface of the casing.
5. The acoustic silencer of any one of the preceding claims, wherein at least one of the one or more acoustic splitters comprise a frame configured to receive the thermoplastic acoustic absorbing materialtherewithin.
2018206578 16 Jul 2018
6. The acoustic silencer of claim 5, wherein the frame comprises a retainer for retaining the thermoplastic acoustic absorbing material within the frame.
7. The acoustic silencer of any one of the preceding claims wherein the one or more acoustic splitters comprise a substantially rounded edge extending along at least part of an exposed edge of the acoustic splitter near an open end of the casing.
8. The acoustic silencer of any one of the preceding claims, wherein the casing is substantially rectangular in shape with a plurality of spaced apart acoustic splitters defining the one or more passageways disposedtherewithin.
9. The acoustic silencer of claim 8, wherein each acoustic splitter extends along a length of the casing, and wherein the one or more passageways are defined between the major surfaces of neighbouring acoustic splitters.
10. The acoustic silencer of any one of claims 1 to 7, wherein the casing is substantially cylindrical in shape and wherein the one or more acoustic splitters are substantially tubular in shape.
11. The acoustic silencer of claim 10, further comprising an additional acoustic splitter disposed at least part way within the casing and spaced apart from the one or more tubular acoustic splitters to define the passageway between the major surface of the one or more acoustic splitters and a major surface of the additional acoustic splitter.
12. An acoustic splitter for an acoustic silencer, the acoustic splitter comprising:
a body having a first major surface;
a frame arranged to receive the body therewithin; and
2018206578 16 Jul 2018 wherein at least part of the first major surface of the body is composed of a thermoplastic acoustic absorbing material comprising a non-uniform thread pattern.
13. The acoustic splitter of claim 12, wherein the thermoplastic is selected from one or more of polyester, polyethylene or polypropylene.
14. The acoustic splitter of either claim 12 or claim 13, wherein the thermoplastic acoustic absorbing material has a density of between about 14 kg/m3and about 60kg/m3.
15. The acoustic splitter of any one of claims 12 to 14, wherein the body is either rectangular, tubular, or cylindrical in shape.
16. A method of manufacturing an acoustic silencer comprising:
providing a casing comprising a first open end and a second open end; and arranging one or more acoustic splitters within the casing to define a passageway providing fluid communication between the first open end and the second open end;
wherein the one or more acoustic splitters each comprise a major surface composed of a thermoplastic acoustic absorbing material comprising a non-uniform thread pattern; and wherein the major surface of the one or more acoustic splitters forms a wall of the at least one passageway to thereby make contact with fluid being conveyed through the at least one passageway.
17. The method of manufacturing an acoustic silencer of claim 16, wherein the thermoplastic acoustic absorbing material is manufactured by air-blowing molten threads of thermoplastic material onto a hot plate in order to produce the non-uniform thread pattern.
2018206578 16 Jul 2018
18. A method of manufacturing an acoustic splitter for an acoustic silencer, the method comprising:
providing a body having a major surface;
providing a frame arranged to receive the body therewithin; and wherein at least part of the major surface of the body is composed of a thermoplastic acoustic absorbing material comprising a non-uniform thread pattern.
19. The method of manufacturing an acoustic splitter of claim 18, wherein, the thermoplastic acoustic absorbing material is manufactured by air-blowing molten threads of thermoplastic material onto a hot plate in order to produce the non-uniform thread pattern.
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2018206578 16 Jul 2018
Figure 1
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2018206578 16 Jul 2018
Figure 2
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2018206578 16 Jul 2018
Figure 3
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2018206578 16 Jul 2018 *3 CM
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2018206578 16 Jul 2018
Figure 6
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2018206578 16 Jul 2018
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Figure 7
AU2018206578A 2017-08-31 2018-07-16 Silencer Active AU2018206578B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2017903515 2017-08-31
AU2017903515A AU2017903515A0 (en) 2017-08-31 Silencer

Publications (2)

Publication Number Publication Date
AU2018206578A1 true AU2018206578A1 (en) 2019-03-14
AU2018206578B2 AU2018206578B2 (en) 2023-02-02

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3421484A1 (en) * 1984-06-08 1985-12-12 G + H Montage Gmbh, 6700 Ludwigshafen Silencer, in particular for flue gas desulphurisation plants
KR100829992B1 (en) * 2007-02-02 2008-05-16 (주)에이티앤비 Low-Noise air exhauster
SE532157C2 (en) * 2008-03-06 2009-11-03 Lindab Ab Noise-canceling baffle and baffle arrangement
CN108458467B (en) * 2017-02-17 2020-11-10 S.I.Pan公司 Separator and muffler including the same

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GB2566601B (en) 2022-05-25
AU2018206578B2 (en) 2023-02-02
GB201812175D0 (en) 2018-09-12
GB2566601A (en) 2019-03-20

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