EP0953964A2 - Foam-molded sound-absorbing articles - Google Patents

Foam-molded sound-absorbing articles Download PDF

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Publication number
EP0953964A2
EP0953964A2 EP99108136A EP99108136A EP0953964A2 EP 0953964 A2 EP0953964 A2 EP 0953964A2 EP 99108136 A EP99108136 A EP 99108136A EP 99108136 A EP99108136 A EP 99108136A EP 0953964 A2 EP0953964 A2 EP 0953964A2
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Prior art keywords
foam
sound
particles
khz
molded
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German (de)
French (fr)
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EP0953964A3 (en
EP0953964B1 (en
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Isidoor Dr. De Grave
Hermann Tatzel
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BASF SE
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BASF SE
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    • 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

Definitions

  • the invention relates to a sound-absorbing molded foam body with a degree of sound absorption in the frequency range of 0.5 to 4 kHz from 50 to 95%.
  • Open cell foam plastics based on polyurethane and Melamine / formaldehyde condensation resins are ideal as sound absorption materials, they are increasing used in many technical applications. However, are natural these foams also have some disadvantages, for example in damp rooms, in the hygiene area and in dust-sensitive areas Investments. There was therefore a need for another Foam plastic with sound absorbing properties.
  • the crystallite melting point (DSC maximum) of the under a. to e. listed Polyolefins are generally between 90 and 170 ° C.
  • Their heat of fusion, determined by the DSC method, is preferably between 20 and 300 J / g, the melt index MFI (230 ° C, 2.16 kp for propylene polymers and 190 ° C, 2.16 kp for ethylene polymers) according to DIN 53 735 between 0.1 and 100 g / 10 min.
  • a preferred method for producing the EPO particles is based on polyolefin granules, which preferably have average diameters of 0.5 to 5 mm. 100 parts by weight of these granules are dispersed in 100 to 500 parts by weight of water in a stirred reactor with the aid of a suspension aid. A blowing agent is then injected in amounts of preferably 2 to 50 parts by weight, based on 100 parts by weight of polymer, and the reactor contents are heated. Suitable blowing agents are hydrocarbons, such as butane, halogenated hydrocarbons, alcohols and CO 2 , N 2 and NH 3 . The blowing agent can be added before or during the heating (this also includes holding times) of the reactor contents to the expansion temperature.
  • the preferred propylene polymers are used at 110 ° C to 180 ° C.
  • a pressure is established in the reactor which is generally higher than 2 bar and does not exceed 100 bar.
  • the bulk density of the resulting EPO particles can be controlled by the choice of the impregnation temperature and the blowing agent.
  • the reactor is expanded, the expansion advantageously being carried out in an intermediate container in which a pressure of preferably 0.5 to 5 bar prevails.
  • the polyolefin granulate containing blowing agent expands and EPO particles with an average diameter of 1 to 20 mm are formed.
  • the bulk density of the EPO particles can be set between 10 and 200 g / l. EPO particles with relatively low bulk densities between 15 and 40 g / l are particularly suitable.
  • the EPO particles are predominantly closed-cell and have a cell number of 1 to 5000 cells / mm 2 , in particular 10 to 1500 cells / mm 2 .
  • foam particles are now in conventional molding machines with the help of water vapor in perforated tools welded. It is essential that, in contrast to the usual Molding production no or at most a low counter pressure prevails during the filling process. In this way the Incomplete welding according to the invention achieved.
  • the amount at cavities, i.e. the gusset volume is between 10 and 40%, preferably between 20 and 38%. A small one, at least spot welding is necessary, however, so that a coherent Shaped body is created.
  • Polystyrene foam particles are produced by another, also known and conventional method.
  • the monomeric styrene optionally in a mixture with other olefinically unsaturated comonomers, initiators, auxiliaries and additives, is suspended in water and polymerized in the presence of suspension stabilizers.
  • the resulting polystyrene beads are separated, washed and dried.
  • the blowing agent can be added during the polymerization, but it is also possible to introduce the blowing agent into the polystyrene beads in a subsequent process step.
  • Suitable blowing agents are C 4 -C 8 hydrocarbons, preferably pentane.
  • the foaming of the polystyrene particles containing blowing agents usually also takes place according to those known in the prior art Procedure by first using water vapor in open or closed pre-expanders in several stages be foamed.
  • the pre-expanded polystyrene particles show generally an average particle size of 1 to 10 mm, in particular from 2 to 8 mm.
  • the preferred bulk density is 10 to 20 g / l.
  • the production of molded bodies takes place in block presses, beforehand in a mixer on the foam particle surface an adhesion promoter (e.g. bitumen) is applied. In the block press, the foam particles become light Back pressure welded into a loose bond.
  • an adhesion promoter e.g. bitumen
  • a great advantage of the sound-absorbing foam molded body based on polyolefins and polystyrene is that these thermoplastic materials meltable and therefore recyclable are.
  • PP foam particles with an average bulk density of 28 g / l were pneumatically compressed from a container under 0.5 bar using a conventional automatic molding machine transported a perforated mold cavity that was under atmospheric pressure.
  • the foam particles in bulk in the mold cavity were cross-steamed with 2.8 bar superheated steam from both sides for 3 seconds each, the shut-off valves in the condensate line being open, and being welded in a punctiform manner.
  • Example 2 The procedure was analogous to Example 1, but with the differences that for filling the mold cavity under atmospheric pressure a differential pressure between the filling container and the mold cavity is applied was and the transverse steaming with 3.2 bar and a steaming time of 4 sec.
  • the resulting cuboid shaped part had a gusset portion from 25% to.
  • the degree of sound absorption in the frequency domain 1.25-2 kHz was between 55 and 70%.
  • Acoustic panels with the dimensions 300 x 200 x 60 mm were produced from PP foam particles with an average bulk density of 17 g / l (Neopolen 2 9220) on a conventional molding machine.
  • the foam particles were transported pneumatically into a perforated mold cavity under atmospheric pressure.
  • the foam particles in bulk in the mold cavity were cross-steamed with hot steam of 2.4 bar from both sides for 3 seconds each (with the shut-off valves in the condensate line of the machine open).
  • the foam particles were spot welded.
  • a cuboid molding with a density of 24 kg / m 3 could be removed.
  • the gusset percentage inside the molded part was 30%.
  • the degree of sound absorption was 80% in the frequency range between 1.25 and 2 kHz.
  • PE foam particles (Neopolen E 1710 from BASF AG) with a bulk density of 13 g / l, which had previously been physically cross-linked by electron radiation, were poured onto an air-permeable, rotating conveyor belt (belt width 1100 mm) approx. 200 mm high and through a Hot air duct transport. The transport speed was 1.6 m / min. and the circulating air in the heating duct 160 ° C. After leaving the 6 m long channel, a point-welded coherent foam particle composite was obtained, which had about 40% voids. The degree of sound absorption in the frequency range 1.25 to 2 kHz of this molded part (density: 14 kg / m 3 ) was 85 to 90%.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

A sound absorbing molded foam article has a sound absorption value of 30-95 % (DIN 52215) at a frequency of 0.5-4 kHz. The foam is a non-fully bonded polyolefin or polystyrene particulate foam having an open volume of 10-40%.

Description

Die Erfindung betrifft einen schallabsorbierenden Schaumstoff-Formkörper mit einem Schallabsorptionsgrad im Frequenzbereich von 0,5 bis 4 kHz von 50 bis 95 %.The invention relates to a sound-absorbing molded foam body with a degree of sound absorption in the frequency range of 0.5 to 4 kHz from 50 to 95%.

Offenzellige Schaumkunststoffe auf Basis von Polyurethanen und Melamin/Formaldehyd-Kondensationsharzen eignen sich hervorragend als Schallabsorptionsmaterialien, sie werden in zunehmenden Maße in vielen technischen Anwendungen eingesetzt. Naturgemäß sind jedoch auch diese Schaumstoffe mit einigen Nachteilen behaftet, etwa in Feuchträumen, im Hygienebereich und in staubempfindlichen Anlagen. Es bestand daher das Bedürfnis nach einem weiteren Schaumkunststoff mit schallabsorbierenden Eigenschaften.Open cell foam plastics based on polyurethane and Melamine / formaldehyde condensation resins are ideal as sound absorption materials, they are increasing used in many technical applications. However, are natural these foams also have some disadvantages, for example in damp rooms, in the hygiene area and in dust-sensitive areas Investments. There was therefore a need for another Foam plastic with sound absorbing properties.

Es wurde nun gefunden, daß nicht vollständig verschweißte Polyolefin- und Polystyrol-Partikelschaumstoffe mit einem Zwickelvolumen zwischen 10 und 40 % einen Schallabsorptionsgrad nach DIN 52215 im Frequenzbereich von 0,5 bis 4 kHz, vorzugsweise von 1,25 bis 2 kHz von 30 - 95 %, vorzugsweise von 50 bis 95 % aufweisen.It has now been found that incompletely welded polyolefin and polystyrene particle foams with a gusset volume between 10 and 40% according to a degree of sound absorption DIN 52215 in the frequency range from 0.5 to 4 kHz, preferably from 1.25 to 2 kHz from 30 to 95%, preferably from 50 to 95%.

Polyolefine im Sinne der vorliegenden Erfindung sind

  • a) Homopolypropylen,
  • b) Randomcopolymere des Propylens mit 0,1 bis 15, vorzugsweise 0,5 bis 12 Gew.-% Ethylen und/oder einem C4-C10-α-Olefin, vorzugsweise ein Copolymer von Propylen mit 0,5 bis 6 Gew.-% Ethylen oder mit 0,5 bis 15 Gew.-% Buten-1 oder ein Terpolymer aus Propylen, 0,5 bis 6 Gew.-% Ethylen und 0,5 bis 6 Gew.-% Buten-1, oder
  • c) Mischungen von a) oder b) mit 0,1 bis 75, vorzugsweise 3 bis 50 Gew.-% eines Polyolefin-Elastomeren, z.B. eines Ethylen/Propylen-Blockcopolymeren mit 30 bis 70 Gew.-% Propylen.
  • d) Polyethylen (PE-LLD, -LD, -MD, -HD) und
  • e) Mischungen aus den unter a bis d genannten Polyolefinen (gegebenenfalls nach Zugabe von Phasenvermittlern).
    • Polyolefins in the sense of the present invention
  • a) homopolypropylene,
  • b) Random copolymers of propylene with 0.1 to 15, preferably 0.5 to 12 wt .-% ethylene and / or a C 4 -C 10 -α-olefin, preferably a copolymer of propylene with 0.5 to 6 wt. -% ethylene or with 0.5 to 15% by weight of butene-1 or a terpolymer of propylene, 0.5 to 6% by weight of ethylene and 0.5 to 6% by weight of butene-1, or
  • c) mixtures of a) or b) with 0.1 to 75, preferably 3 to 50% by weight of a polyolefin elastomer, for example an ethylene / propylene block copolymer with 30 to 70% by weight of propylene.
  • d) polyethylene (PE-LLD, -LD, -MD, -HD) and
  • e) Mixtures of the polyolefins mentioned under a to d (if appropriate after adding phase mediators).

    • Der Kristallitschmelzpunkt (DSC-Maximum) der unter a. bis e. aufgelisteten Polyolefine liegt im allgemeinen zwischen 90 und 170°C. Ihre Schmelzwärme, bestimmt nach der DSC-Methode, liegt vorzugsweise zwischen 20 und 300 J/g, der Schmelzindex MFI (230°C, 2,16 kp für Propylenpolymerisate und 190°C, 2,16 kp für Ethylenpolymerisate) nach DIN 53 735 zwischen 0,1 und 100 g/10 min.The crystallite melting point (DSC maximum) of the under a. to e. listed Polyolefins are generally between 90 and 170 ° C. Their heat of fusion, determined by the DSC method, is preferably between 20 and 300 J / g, the melt index MFI (230 ° C, 2.16 kp for propylene polymers and 190 ° C, 2.16 kp for ethylene polymers) according to DIN 53 735 between 0.1 and 100 g / 10 min.

    Bei einem bevorzugten Verfahren zur Herstellung der EPO-Partikel geht man von Polyolefingranulat aus, welches vorzugsweise mittlere Durchmesser von 0,5 bis 5 mm aufweist. In einem Rührreaktor werden 100 Gew.-Teile dieses Granulats in 100 bis 500 Gew.-Teilen Wasser, mit Hilfe eines Suspendierhilfsmittels dispergiert. Dann wird ein Treibmittel in Mengen von vorzugsweise 2 bis 50 Gew.-Teilen bezogen auf 100 Gew.-Teile Polymer, eingepreßt und der Reaktorinhalt aufgeheizt. Geeignete Treibmittel sind Kohlenwasserstoffe, wie Butan, Halogenkohlenwasserstoffe, Alkohole sowie CO2, N2 und NH3. Die Treibmittelzugabe kann dabei vor oder während des Aufheizens (dazu gehören auch Haltezeiten) des Reaktorinhalts auf die Entspannungstemperatur erfolgen. Diese sollte 5°C unter bis 20°C über, vorzugsweise 2 bis 10°C über dem Kristallitschmelzpunkt des Polyolefins liegen. Bei den bevorzugten Propylenpolymerisaten arbeitet man bei 110°C bis 180°C. Je nach Menge und Art des Treibmittels sowie nach der Höhe der Temperatur stellt sich im Reaktor ein Druck ein, der im allgemeinen höher als 2 bar ist und 100 bar nicht übersteigt. Durch die Wahl der Imprägniertemperatur und des Treibmittels kann die Schüttdichte der entstandenen EPO-Partikel gesteuert werden. Nach Erreichen der Entspannungstemperatur wird der Reaktor entspannt, wobei die Entspannung zweckmäßigerweise in einen Zwischenbehälter erfolgt, in dem ein Druck von vorzugsweise 0,5 bis 5 bar herrscht. Beim Entspannen des Reaktors erfolgt eine Expansion des treibmittelhaltigen Polyolefin-Granulats und es entstehend EPO-Partikel mit einem mittleren Durchmesser von 1 bis 20 mm.A preferred method for producing the EPO particles is based on polyolefin granules, which preferably have average diameters of 0.5 to 5 mm. 100 parts by weight of these granules are dispersed in 100 to 500 parts by weight of water in a stirred reactor with the aid of a suspension aid. A blowing agent is then injected in amounts of preferably 2 to 50 parts by weight, based on 100 parts by weight of polymer, and the reactor contents are heated. Suitable blowing agents are hydrocarbons, such as butane, halogenated hydrocarbons, alcohols and CO 2 , N 2 and NH 3 . The blowing agent can be added before or during the heating (this also includes holding times) of the reactor contents to the expansion temperature. This should be 5 ° C below to 20 ° C above, preferably 2 to 10 ° C above the crystalline melting point of the polyolefin. The preferred propylene polymers are used at 110 ° C to 180 ° C. Depending on the amount and type of blowing agent and on the level of the temperature, a pressure is established in the reactor which is generally higher than 2 bar and does not exceed 100 bar. The bulk density of the resulting EPO particles can be controlled by the choice of the impregnation temperature and the blowing agent. After the expansion temperature has been reached, the reactor is expanded, the expansion advantageously being carried out in an intermediate container in which a pressure of preferably 0.5 to 5 bar prevails. When the reactor is decompressed, the polyolefin granulate containing blowing agent expands and EPO particles with an average diameter of 1 to 20 mm are formed.

    Die Schüttdichte der EPO-Partikel ist in weiten Grenzen zwischen 10 und 200 g/l, einstellbar. Besonders geeignet sind EPO-Partikeln mit verhältnismäßig niedrigen Schüttdichten zwischen 15 und 40 g/l. Die EPO-Partikel sind überwiegend geschlossenzellig und besitzen eine Zellzahl von 1 bis 5000 Zellen/mm2, insbesondere 10 bis 1500 Zellen/mm2.The bulk density of the EPO particles can be set between 10 and 200 g / l. EPO particles with relatively low bulk densities between 15 and 40 g / l are particularly suitable. The EPO particles are predominantly closed-cell and have a cell number of 1 to 5000 cells / mm 2 , in particular 10 to 1500 cells / mm 2 .

    Diese Schaumstoffpartikel werden nun in üblichen Formteilautomaten mit Hilfe von Wasserdampf in perforierten Werkzeugen miteinander verschweißt. Wesentlich ist, daß im Gegensatz zur üblichen Formteilherstellung kein oder höchstens ein geringer Gegendruck während des Füllvorgangs herrscht. Auf diese Weise wird die erfindungsgemäß unvollständige Verschweißung erreicht. Der Anteil an Hohlstellen, d.h., das Zwickelvolumen liegt zwischen 10 und 40 %, vorzugsweise zwischen 20 und 38 %. Eine geringe, wenigstens punktuelle Verschweißung ist aber notwendig, damit ein zusammenhängender Formkörper entsteht.These foam particles are now in conventional molding machines with the help of water vapor in perforated tools welded. It is essential that, in contrast to the usual Molding production no or at most a low counter pressure prevails during the filling process. In this way the Incomplete welding according to the invention achieved. The amount at cavities, i.e. the gusset volume is between 10 and 40%, preferably between 20 and 38%. A small one, at least spot welding is necessary, however, so that a coherent Shaped body is created.

    Bei einem anderen Hersteilverfahren wird in einem Extruder das Polyolefin aufgeschmolzen und ein flüchtiges Treibmittel, vorzugsweise wieder ein Kohlenwasserstoff, wird eingepreßt. Danach wird die treibmittelhaltige Schmelze an die Atmosphäre ausgepreßt, wo sie aufschäumt. Der entstandene Schaumstoffstrang wird dann zu Schaumstoffpartikeln zerkleinert, die im Falle des Polyethylens zweckmäßigerweise einer Elektronenstrahlvernetzung unterworfen werden. Dabei sind verhältnismäßig niedrige Schüttdichten im Bereich von 10 bis 20 g/l erreichbar. Im Falle der Polyethylen-Schaumstoffpartikel kann die Halbzeugherstellung auch auf einem luftdurchlässigen Transportband erfolgen, das einen Heißluftkanal durchläuft.In another manufacturing process, this is done in an extruder Melted polyolefin and a volatile blowing agent, preferably another hydrocarbon, is injected. After that the melt containing the blowing agent is pressed out into the atmosphere, where it foams. The resulting strand of foam is then crushed into foam particles, which in the case of Polyethylene expediently an electron beam crosslinking be subjected. Here are relatively low bulk densities achievable in the range of 10 to 20 g / l. In the case of polyethylene foam particles can also manufacture semi-finished products take place on an air-permeable conveyor belt, the one Passes through the hot air duct.

    Polystyrol-Schaumstoffpartikel werden nach einem anderen, ebenfalls an sich üblichen und bekannten Verfahren hergestellt. Dazu wird das monomere Styrol, gegebenenfalls im Gemisch mit anderen olefinisch ungesättigten Comonomeren, Initiatoren, Hilfs- und Zusatzstoffen in Wasser suspendiert und in Gegenwart von Suspensionsstabilisatoren polymerisiert. Die entstehenden Polystyrolperlen werden abgetrennt, gewaschen und getrocknet. Die Zugabe des Treibmittels kann dabei bereits während der Polymerisation erfolgen, es ist jedoch auch möglich, das Treibmittel in einem nachfolgenden Verfahrensschritt in die Polystyrolperlen einzubringen. Geeignete Treibmittel sind C4-C8-Kohlenwasserstoffe, vorzugsweise Pentan.Polystyrene foam particles are produced by another, also known and conventional method. For this purpose, the monomeric styrene, optionally in a mixture with other olefinically unsaturated comonomers, initiators, auxiliaries and additives, is suspended in water and polymerized in the presence of suspension stabilizers. The resulting polystyrene beads are separated, washed and dried. The blowing agent can be added during the polymerization, but it is also possible to introduce the blowing agent into the polystyrene beads in a subsequent process step. Suitable blowing agents are C 4 -C 8 hydrocarbons, preferably pentane.

    Die Verschäumung der Treibmittel enthaltenden Polystyrol-Partikel erfolgt üblicherweise ebenfalls nach den im Stand der Technik bekannten Verfahren, indem sie zunächst mit Wasserdampf in offenen oder geschlossenen Vorschäumern in mehreren Stufen weitgehend ausgeschäumt werden. Die vorgeschäumten Polystyrolpartikel weisen im allgemeinen eine mittlere Partikelgröße von 1 bis 10 mm, insbesondere von 2 bis 8 mm auf. Die bevorzugte Schüttdichte beträgt 10 bis 20 g/l. Die Herstellung von Formkörpern erfolgt in Blockpressen, wobei vorher in einem Mischer auf die Schaumstoffpartikeloberfläche ein Haftvermittler (z.B. Bitumen) aufgebracht wird. In der Blockpresse werden die Schaumstoffpartikel unter leichtem Gegendruck zu einem lockeren Verbund verschweißt. The foaming of the polystyrene particles containing blowing agents usually also takes place according to those known in the prior art Procedure by first using water vapor in open or closed pre-expanders in several stages be foamed. The pre-expanded polystyrene particles show generally an average particle size of 1 to 10 mm, in particular from 2 to 8 mm. The preferred bulk density is 10 to 20 g / l. The production of molded bodies takes place in block presses, beforehand in a mixer on the foam particle surface an adhesion promoter (e.g. bitumen) is applied. In the block press, the foam particles become light Back pressure welded into a loose bond.

    Ein großer Vorteil der schallabsorbierenden Schaumstoff-Formkörper auf Basis von Polyolefinen und Polystyrol ist, daß diese thermoplastischen Kunststoffe schmelzbar und somit recycelbar sind.A great advantage of the sound-absorbing foam molded body based on polyolefins and polystyrene is that these thermoplastic materials meltable and therefore recyclable are.

    Beispiel 1example 1

    Zur Herstellung von Akustikplatten mit den Abmessungen 900x400x140 mm wurden PP-Schaumstoffpartikeln mit einer mittleren Schüttdichte von 28 g/l (Neopolen 2 9230 der BASF AG) unter Verwendung eines konventionellen Formteilautomaten druckpneumatisch von einem unter 0,5 bar stehenden Behälter in ein perforiertes Formnest, das unter Atmosphärendruck stand, transportiert. Die in loser Schüttung im Formnest befindlichen Schaumstoffpartikeln wurden mit 2,8 bar Heißdampf von beiden Seiten je 3 sec querbedampft, wobei die Absperrventile in der Kondensatleitung geöffnet waren, und dabei punktförmig verschweißt. Nach dem Abkühlen im Formnest konnte nach Öffnen der Formteilmaschine ein quaderförmiges Formteil mit einer Dichte von 33 kg/m3 entnommen werden, das eine relativ hohe Anzahl von Zwickeln (Fehlstellen zwischen den punktförmig verschweißten Schaumstoffpartikeln) aufwies. Der Zwickelanteil lag bei 35 %. Der Schallabsorptionsgrad nach DIN 52215 im Frequenzbereich 1,25-2 KHz lag zwischen 75 und 90 %.To produce acoustic panels with the dimensions 900 x 400 x 140 mm, PP foam particles with an average bulk density of 28 g / l (Neopolen 2 9230 from BASF AG) were pneumatically compressed from a container under 0.5 bar using a conventional automatic molding machine transported a perforated mold cavity that was under atmospheric pressure. The foam particles in bulk in the mold cavity were cross-steamed with 2.8 bar superheated steam from both sides for 3 seconds each, the shut-off valves in the condensate line being open, and being welded in a punctiform manner. After cooling in the mold cavity, after opening the molding machine, a cuboid molding with a density of 33 kg / m 3 could be removed, which had a relatively high number of gussets (defects between the point-welded foam particles). The gusset percentage was 35%. The degree of sound absorption according to DIN 52215 in the frequency range 1.25-2 KHz was between 75 and 90%.

    Beispiel 2Example 2

    Es wurde analog Beispiel 1 verfahren, jedoch mit den Unterschieden, daß zur Befüllung der unter Atmosphärendruck stehenden Formkavität ein Differenzdruck zwischen Füllbehälter und Formnest angewandt wurde und die Querbedampfung mit 3,2 bar und einer Bedampfungszeit von 4 sec erfolgte.The procedure was analogous to Example 1, but with the differences that for filling the mold cavity under atmospheric pressure a differential pressure between the filling container and the mold cavity is applied was and the transverse steaming with 3.2 bar and a steaming time of 4 sec.

    Das resultierende quaderförmige Formteil wies einen Zwickelanteil von 25 % auf. Der Schallabsorptionsgrad im Frequenzbereich 1,25-2 kHz lag zwischen 55 und 70 %.The resulting cuboid shaped part had a gusset portion from 25% to. The degree of sound absorption in the frequency domain 1.25-2 kHz was between 55 and 70%.

    Beispiel 3Example 3

    Aus PP-Schaumstoffpartikeln mit einer mittleren Schüttdichte von 17 g/l (Neopolen 2 9220) wurden Akustikplatten mit den Abmessungen 300x200x60 mm auf einem konventionellen Formteilautomaten hergestellt. Die Schaumstoffpartikel wurden pneumatisch in eine unter Atmosphärendruck stehende perforierte Formkavität transportiert. Die in loser Schüttung im Formnest befindlichen Schaumstoffpartikeln wurden mit Heißdampf von 2,4 bar von beiden Seiten je 3 sec querbedampft (bei geöffneten Absperrventilen in der Kondensatleitung der Maschine). Dabei wurden die Schaumstoffpartikel punktförmig verschweißt. Nach dem Abkühlen im Formnest konnte nach Öffnen der Formteilmaschine ein quaderförmiges Formteil mit einer Dichte von 24 kg/m3 entnommen werden. Der Zwickelanteil im Innern des Formteiles betrug 30 %. Der Schallabsorptionsgrad lag im Frequenzbereich zwischen 1,25 und 2 kHz bei 80 %.Acoustic panels with the dimensions 300 x 200 x 60 mm were produced from PP foam particles with an average bulk density of 17 g / l (Neopolen 2 9220) on a conventional molding machine. The foam particles were transported pneumatically into a perforated mold cavity under atmospheric pressure. The foam particles in bulk in the mold cavity were cross-steamed with hot steam of 2.4 bar from both sides for 3 seconds each (with the shut-off valves in the condensate line of the machine open). The foam particles were spot welded. After cooling in the mold cavity and after opening the molding machine, a cuboid molding with a density of 24 kg / m 3 could be removed. The gusset percentage inside the molded part was 30%. The degree of sound absorption was 80% in the frequency range between 1.25 and 2 kHz.

    Beispiel 4Example 4

    PE-Schaumstoffpartikel (Neopolen E 1710 der BASF AG) mit einer Schüttdichte von 13 g/l, die vorher physikalisch durch Elektronenbestrahlung vernetzt worden waren, wurden auf ein luftdurchlässiges, umlaufendes Transportband (Bandbreite 1100 mm) ca. 200 mm hoch aufgeschüttet und durch einen Heißluftkanal transport. Die Transportgeschwindigkeit betrug 1,6 m/min. und die Umwälzluft im Heizkanal 160°C. Nach Verlassen des 6 m langen Kanals wurde ein punktförmig verschweißter zusammenhängender Schaumstoffpartikelverbund erhalten, der ca. 40 % Hohlstellen aufwies. Der Schallabsorptionsgrad im Frequenzbereich 1,25 bis 2 kHz dieses Formteils (Dichte: 14 kg/m3) lag bei 85 bis 90 %.PE foam particles (Neopolen E 1710 from BASF AG) with a bulk density of 13 g / l, which had previously been physically cross-linked by electron radiation, were poured onto an air-permeable, rotating conveyor belt (belt width 1100 mm) approx. 200 mm high and through a Hot air duct transport. The transport speed was 1.6 m / min. and the circulating air in the heating duct 160 ° C. After leaving the 6 m long channel, a point-welded coherent foam particle composite was obtained, which had about 40% voids. The degree of sound absorption in the frequency range 1.25 to 2 kHz of this molded part (density: 14 kg / m 3 ) was 85 to 90%.

    Claims (2)

    Schallabsorbierender Schaumstoff-Formkörper mit einem Schallabsorptionsgrad nach DIN 52215 im Frequenzbereich von 0,5-4 KHz von 30-95 %, dadurch gekennzeichnet, daß der Schaumstoff ein nicht vollständig verschweißter Polyolefin- oder Polystyrol-Partikelschaumstoff mit einem Zwickelvolumen zwischen 10 und 40 % ist.Sound absorbing foam molded body with a Sound absorption level according to DIN 52215 in the frequency range of 0.5-4 KHz from 30-95%, characterized in that the Foam a not fully welded polyolefin or Polystyrene particle foam with a gusset volume is between 10 and 40%. Schallabsorbierender Schaumstoff-Formkörper, dadurch gekennzeichnet, daß der Schaumstoff ein Polyethylen- oder Polypropylen-Partikelschaumstoff ist.Sound-absorbing molded foam body, characterized in that that the foam is a polyethylene or polypropylene particle foam is.
    EP99108136A 1998-04-27 1999-04-26 Foam-molded sound-absorbing articles Expired - Lifetime EP0953964B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19818811 1998-04-27
    DE19818811A DE19818811A1 (en) 1998-04-27 1998-04-27 Sound absorbing foam molded body

    Publications (3)

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    EP0953964A2 true EP0953964A2 (en) 1999-11-03
    EP0953964A3 EP0953964A3 (en) 2002-04-17
    EP0953964B1 EP0953964B1 (en) 2005-08-31

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    EP99108136A Expired - Lifetime EP0953964B1 (en) 1998-04-27 1999-04-26 Foam-molded sound-absorbing articles

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    US (1) US6060529A (en)
    EP (1) EP0953964B1 (en)
    BR (1) BR9901288B1 (en)
    DE (2) DE19818811A1 (en)
    ES (1) ES2246552T3 (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US7832524B2 (en) 2005-08-08 2010-11-16 Alstom Technology Ltd Sound absorber for gas turbine installations

    Families Citing this family (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE10311245A1 (en) * 2003-03-14 2004-09-30 Greiner Perfoam Ges.m.b.H. Acoustic part made of composite foam
    BRPI0603479A (en) * 2006-08-14 2008-04-01 Maria Isabel Pinto Koleski expanded polypropylene foam
    CN114835966B (en) * 2022-06-02 2024-02-06 南京中远高分子材料科技有限公司 Ultralow-frequency soundproof cotton, production process thereof and production detection device

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    US4557970A (en) * 1983-11-21 1985-12-10 Monsanto Company Laminate structure with improved acoustical absorption
    US4898783A (en) * 1986-10-14 1990-02-06 The Dow Chemical Company Sound and thermal insulation
    US5068001A (en) * 1987-12-16 1991-11-26 Reinhold Haussling Method of making a sound absorbing laminate

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    JPS5432454B2 (en) * 1974-06-08 1979-10-15
    US4111862A (en) * 1974-07-25 1978-09-05 Bell Fibre Products Corporation Mastic composition and composite structural panels formed therefrom

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    US4557970A (en) * 1983-11-21 1985-12-10 Monsanto Company Laminate structure with improved acoustical absorption
    US4898783A (en) * 1986-10-14 1990-02-06 The Dow Chemical Company Sound and thermal insulation
    US5068001A (en) * 1987-12-16 1991-11-26 Reinhold Haussling Method of making a sound absorbing laminate

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US7832524B2 (en) 2005-08-08 2010-11-16 Alstom Technology Ltd Sound absorber for gas turbine installations

    Also Published As

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    EP0953964A3 (en) 2002-04-17
    BR9901288A (en) 2000-03-21
    DE59912478D1 (en) 2005-10-06
    EP0953964B1 (en) 2005-08-31
    ES2246552T3 (en) 2006-02-16
    US6060529A (en) 2000-05-09
    DE19818811A1 (en) 1999-10-28
    BR9901288B1 (en) 2009-08-11

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