DE19962865C1 - Shaped polymer foam component for sound absorption purposes in automobiles is provided with perforations in its compacted surface layer - Google Patents

Shaped polymer foam component for sound absorption purposes in automobiles is provided with perforations in its compacted surface layer

Info

Publication number
DE19962865C1
DE19962865C1 DE19962865A DE19962865A DE19962865C1 DE 19962865 C1 DE19962865 C1 DE 19962865C1 DE 19962865 A DE19962865 A DE 19962865A DE 19962865 A DE19962865 A DE 19962865A DE 19962865 C1 DE19962865 C1 DE 19962865C1
Authority
DE
Germany
Prior art keywords
sound absorption
perforations
polymer foam
automobiles
surface layer
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.)
Revoked
Application number
DE19962865A
Other languages
German (de)
Inventor
Arno Becker
Dirk Sagemuehl
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.)
Bayer AG
Original Assignee
Bayer AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7934390&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE19962865(C1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bayer AG filed Critical Bayer AG
Priority to DE19962865A priority Critical patent/DE19962865C1/en
Priority to EP00983290A priority patent/EP1244734A1/en
Priority to JP2001548602A priority patent/JP2003518538A/en
Priority to KR1020027008153A priority patent/KR20020063920A/en
Priority to PCT/EP2000/012565 priority patent/WO2001048069A1/en
Priority to BR0016698-7A priority patent/BR0016698A/en
Priority to AU20083/01A priority patent/AU2008301A/en
Priority to US10/168,419 priority patent/US20020179367A1/en
Priority to MXPA02006238A priority patent/MXPA02006238A/en
Priority to CA002394760A priority patent/CA2394760A1/en
Publication of DE19962865C1 publication Critical patent/DE19962865C1/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/34—Chemical features in the manufacture of articles consisting of a foamed macromolecular core and a macromolecular surface layer having a higher density than the core
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00—Foam properties
    • C08G2110/0041—Foam properties having specified density
    • C08G2110/0058—≥50 and <150kg/m3
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2350/00—Acoustic or vibration damping material

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

The shaped polymer foam component for sound absorption purposes in automobiles - in particular, for the frequency range above 1500 Hz - is provided with perforations in its compacted surface layer.

Description

Die Erfindung betrifft Polymerschaum-Formteile mit erhöhtem Schallabsorptionsver­ mögen.The invention relates to polymer foam molded parts with increased sound absorption to like.

Polymerschaum-Formteile, insbesondere auch Polyurethanschaum-Formteile, wer­ den vielfältig zur Gehäuseisolation von Apparaten, insbesondere auch im Kraftfahr­ zeugbereich, beispielsweise als Kofferraumabdeckungen, Längssäulenabdeckungen usw. eingesetzt. Die Formschaumteile sind dabei im allgemeinen flächig ausgedehnt bei einer Dicke des Formschaumteils von 0,5 bis 5 cm. Die flächige Ausdehnung kann in der dritten Dimension gekrümmt sein.Polymer foam molded parts, in particular also polyurethane foam molded parts, who versatile for housing insulation of devices, especially in motor vehicles stuff area, for example as trunk covers, longitudinal pillar covers etc. used. The molded foam parts are generally flat with a thickness of the molded foam part of 0.5 to 5 cm. The areal extent can be curved in the third dimension.

Derartige Formschaumteile besitzen gegenüber ihrem Volumen eine äußere verdich­ tete Schicht, die auch als Haut bezeichnet wird. Die Verdichtung der Oberfläche geschieht bei der Formschaumherstellung durch den Kontakt der noch nicht ausge­ härteten Schaummasse mit der Formoberfläche, wobei oberflächig vorhandene Schaumbläschen zerstört werden. Die Oberflächenhaut ist ein inhärentes Merkmal von Formschaum. Versuche, durch Einsatz spezieller Schäummittel oder durch chemische Modifizierung der schaumbildenden Masse die Tendenz zur Ausbildung einer Oberflächenhaut zu reduzieren, haben nur graduell zum Erfolg geführt.Such molded foam parts have an outer compression compared to their volume layer, which is also called skin. The compaction of the surface happens in the production of molded foam through the contact of the not yet hardened foam mass with the mold surface, being superficial Foam bubbles can be destroyed. The surface skin is an inherent characteristic of molded foam. Attempts to use special foaming agents or chemical modification of the foam-forming mass the tendency to training reducing a surface skin has only gradually led to success.

In DE-OS-25 25 051 sind Film-Schaum-Schichtstoffe beschrieben, die aus einem offenzelligen Polyurethanschaum und einem mit diesem verbundenen deformierbaren, perforierten Film bestehen können, der zum Beispiel eine Plastik- oder eine Metallfolie sein kann.DE-OS-25 25 051 describes film-foam laminates which consists of an open-cell polyurethane foam and a associated with this deformable, perforated film can exist, for example a plastic or a Can be metal foil.

Eine Aufgabe von Formschaumteilen im Kfz-Bereich und im Bereich der Apparate­ isolierung ist die Schalldämpfung insbesondere im Bereich von oberhalb 1000 Hz, insbesondere oberhalb 5000 Hz.A task of molded foam parts in the automotive sector and in the field of apparatus Isolation is sound absorption, especially in the range above 1000 Hz, especially above 5000 Hz.

Es wurde nun gefunden, dass die Schallabsorption im Bereich der genannten höheren Frequenzen dadurch verbessert werden kann, dass die Formschaum-Haut perforiert wird. It has now been found that the sound absorption is in the range of the higher Frequencies can be improved by perforating the molded foam skin becomes.  

Gegenstand der vorliegenden Erfindung sind daher Polymerschaum-Formteile mit erhöhtem Schalladsoptionsvermögen im Frequenzbereich oberhalb 1500 Hz, die durch eine Perforierung der oberflächig vorhandenen Verdichtungsschicht gekenn­ zeichnet sind.The present invention therefore relates to molded polymer foam parts increased sound absorption in the frequency range above 1500 Hz, the characterized by perforation of the compression layer present on the surface are drawn.

Vorzugsweise besteht die Perforierung aus Löchern von 0,1 bis 10 mm ∅, insbeson­ dere bevorzugt 0,3 bis 3 mm ∅. Die erfindungsgemäße Perforierung ist jedoch nicht an kreisrunde Durchmesser gebunden. Vorteilhaft können ovale oder schlitzförmige Perforierungen eingesetzt werden. Insbesondere bevorzugt sind schlitzförmige Perfo­ rierungen mit einem Querschnittsverhältnis von 1 : 5 bis 1 : 100. Im Falle von schlitzförmigen Perforierungen werden diese bevorzugt in mindestens 2 Richtungen auf der Oberfläche angeordnet.The perforation preferably consists of holes of 0.1 to 10 mm ∅, in particular whose preference is 0.3 to 3 mm ∅. However, the perforation according to the invention is not tied to circular diameter. Oval or slit-shaped can be advantageous Perforations are used. Slot-shaped perfo are particularly preferred rations with an aspect ratio of 1: 5 to 1: 100. In the case of slot-shaped perforations are preferred in at least 2 directions arranged on the surface.

Ferner sind kreisförmige Schlitze in Form von geschlossenen oder unterbrochenen Kreisen geeignet.Furthermore, circular slots are in the form of closed or interrupted ones Suitable for circles.

Im Falle von nicht kreisförmig, lochartigen Perforierungen soll die kleinere Quer­ schnittsabmessung vorzugsweise 0,1 bis 3 mm, insbesondere bevorzugt 0,5 bis 2 mm, betragen.In the case of non-circular, hole-like perforations, the smaller cross should be cut dimension preferably 0.1 to 3 mm, particularly preferably 0.5 to 2 mm.

Die Summe der Perforationen kann bis zu 50% der verdichteten Oberfläche ausma­ chen. Im allgemeinen ist eine Summe der Perforationen zwischen 0,1 und 10% der verdichteten Oberfläche ausreichend. Besonders bevorzugt beträgt die Summe der Perforationen zwischen 1,5 und 4% der Oberfläche.The total number of perforations can be up to 50% of the compacted surface chen. In general, a total of the perforations is between 0.1 and 10% of the compacted surface sufficient. The sum is particularly preferably the Perforations between 1.5 and 4% of the surface.

Bevorzugt werden Polyurethanschaumstoff-Formteile mit einer Dichte von 60 bis 120 kg/m3 eingesetzt. Die Erfindung ist jedoch nicht auf die üblicherweise bei terrestrischer Anwendung bevorzugten Formschaumdichten beschränkt. Sie kommt auch zum Zuge bei üblicherweise im Flugzeugbau eingesetzten viel niedrigeren Dichten bis hinab zu weniger als 10 kg/m3. Polyurethane foam molded parts with a density of 60 to 120 kg / m 3 are preferably used. However, the invention is not restricted to the molded foam densities which are usually preferred for terrestrial use. It also comes into play at much lower densities commonly used in aircraft construction down to less than 10 kg / m 3 .

Die Perforierung soll selbstverständlich nicht das Formschaumteil durchdringen, sondern lediglich die Verdichtungsschicht der Oberfläche.The perforation should of course not penetrate the molded foam part, but only the compaction layer of the surface.

Die Anbringung der Perforierung erfolgt vorteilhaft gleichzeitig mit der üblicher­ weise durchgeführten Walzung des Polymerschaum-Formteils zur Erhöhung der Offenporigkeit des Schaumes. Hierzu werden vorzugsweise die Walzen mit Nadeln oder zylinderförmigen Noppen versehen, die sich während des Walzvorganges durch die Verdichtungs-Oberflächenschicht des Polymerschaum-Formteils bohren. Bevor­ zugt werden zylinderförmige Hohlnoppen benutzt, die an ihrer Stirnseite offen sind und deren Außenkante eine Schneidfläche aufweist.The perforation is advantageously carried out simultaneously with the conventional one performed rolling of the polymer foam molding to increase the Open porosity of the foam. For this purpose, the rollers with needles are preferably used or cylindrical knobs, which stand out during the rolling process drill the compression surface layer of the polymer foam molding. Before Cylinder-shaped hollow knobs are used, which are open on their front side and the outer edge of which has a cutting surface.

Die Erfindung wird nachfolgend anhand der Beispiele 1 bis 3 erläutert. The invention is explained below using Examples 1 to 3.  

BeispieleExamples Beispiel 1example 1

Es wird ein Polyurethan-Schaumstoff-Formteil einer Dichte von 80 kg/m3 und einer Dicke von 25 mm eingesetzt. Aus dem ebenen, flächigen Formteil werden senkrecht zur Formteil-Oberfläche Proben von 20 mm ∅ geschnitten. Die frequenzabhängige Schallabsorption wird nach ASTM E 1050-90 in einem Schallabsorptionrohr von 20 mm ∅ gemessen. Kurve a) der beigefügten Fig. 1 zeigt die gemessene Schallabsorp­ tion des Probekörpers mit nicht perforierter Oberflächenhaut.A polyurethane foam molding with a density of 80 kg / m 3 and a thickness of 25 mm is used. Samples of 20 mm ∅ are cut from the flat, flat molding perpendicular to the molding surface. The frequency-dependent sound absorption is measured according to ASTM E 1050-90 in a sound absorption tube of 20 mm ∅. Curve a) of the accompanying Fig. 1 shows the measured sound absorption of the test specimen with imperforate surface skin.

Beispiel 2Example 2

Der nach Beispiel 1 hergestellte Probekörper wird oberflächig mit ca. 1 mm großen Löchern versehen, deren Flächensumme 1% der Gesamtoberfläche ausmacht. Die entsprechende Schallabsorptionskurve ist Kurve b) der Fig. 1.The test specimen produced according to Example 1 is provided on the surface with approximately 1 mm large holes, the total area of which accounts for 1% of the total surface. The corresponding sound absorption curve is curve b) of FIG. 1.

Beispiel 3Example 3

Der Probekörper wird entsprechend Beispiel 1 präpariert, wobei jedoch die Flächen­ summe der Perforationen 2% der Oberfläche ausmacht. Die entsprechende Schallab­ sorptionskurve ist Kurve c) der Fig. 2.The test specimen is prepared according to Example 1, but the area of the perforations accounts for 2% of the surface. The corresponding sound absorption curve is curve c) of FIG. 2.

Claims (6)

1. Polymerschaum-Formteil mit erhöhtem Schallabsorptionsvermögen im Fre­ quenzbereich oberhalb 1500 Hz gekennzeichnet durch eine Perforierung der oberflächig vorhandenen Verdichtungsschicht.1. Polymer foam molding with increased sound absorption capacity in the frequency range above 1500 Hz characterized by perforation of the compression layer present on the surface. 2. Formteil nach Anspruch 1, dadurch gekennzeichnet, dass die Perforierung aus Löchern mit einem Durchmesser von 0,1 bis 10 mm besteht.2. Molding according to claim 1, characterized in that the perforation There are holes with a diameter of 0.1 to 10 mm. 3. Formteil nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Perforie­ rung aus Löchern mit einem Durchmesser von 0,3 bis 3 mm besteht.3. Molding according to claim 1 or 2, characterized in that the perforation consists of holes with a diameter of 0.3 to 3 mm. 4. Formteil nach einem der Ansprüche 1 bis 3, wobei die Summe der Perforatio­ nen zwischen 0,1 und 10% der Oberfläche ausmacht.4. Molding according to one of claims 1 to 3, wherein the sum of the perforation accounts for between 0.1 and 10% of the surface. 5. Formteil nach einem der Ansprüche 1 bis 4, wobei die Summe der Perforatio­ nen zwischen 1,5 und 4% der Oberfläche ausmacht.5. Molding according to one of claims 1 to 4, wherein the sum of the perforation between 1.5 and 4% of the surface. 6. Formteil nach einem der Ansprüche 1 bis 5 aus Polyurethanschaumstoff mit einer Dichte von 60 bis 120 kg/m3.6. Molding according to one of claims 1 to 5 made of polyurethane foam with a density of 60 to 120 kg / m 3 .
DE19962865A 1999-12-24 1999-12-24 Shaped polymer foam component for sound absorption purposes in automobiles is provided with perforations in its compacted surface layer Revoked DE19962865C1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
DE19962865A DE19962865C1 (en) 1999-12-24 1999-12-24 Shaped polymer foam component for sound absorption purposes in automobiles is provided with perforations in its compacted surface layer
AU20083/01A AU2008301A (en) 1999-12-24 2000-12-12 Sound-absorbing polymer foam molded article
JP2001548602A JP2003518538A (en) 1999-12-24 2000-12-12 Polymer foam moldings with improved sound absorption
KR1020027008153A KR20020063920A (en) 1999-12-24 2000-12-12 Sound-Absorbing Polymer Foam Molded Article
PCT/EP2000/012565 WO2001048069A1 (en) 1999-12-24 2000-12-12 Sound-absorbing polymer foam molded article
BR0016698-7A BR0016698A (en) 1999-12-24 2000-12-12 Molded piece of polymeric foam with sound absorption capacity
EP00983290A EP1244734A1 (en) 1999-12-24 2000-12-12 Sound-absorbing polymer foam molded article
US10/168,419 US20020179367A1 (en) 1999-12-24 2000-12-12 Sound-absorbing polymer foam molded article
MXPA02006238A MXPA02006238A (en) 1999-12-24 2000-12-12 Soundabsorbing polymer foam molded article.
CA002394760A CA2394760A1 (en) 1999-12-24 2000-12-12 Sound-absorbing polymer foam molded article

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19962865A DE19962865C1 (en) 1999-12-24 1999-12-24 Shaped polymer foam component for sound absorption purposes in automobiles is provided with perforations in its compacted surface layer

Publications (1)

Publication Number Publication Date
DE19962865C1 true DE19962865C1 (en) 2001-02-15

Family

ID=7934390

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19962865A Revoked DE19962865C1 (en) 1999-12-24 1999-12-24 Shaped polymer foam component for sound absorption purposes in automobiles is provided with perforations in its compacted surface layer

Country Status (9)

Country Link
EP (1) EP1244734A1 (en)
JP (1) JP2003518538A (en)
KR (1) KR20020063920A (en)
AU (1) AU2008301A (en)
BR (1) BR0016698A (en)
CA (1) CA2394760A1 (en)
DE (1) DE19962865C1 (en)
MX (1) MXPA02006238A (en)
WO (1) WO2001048069A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10310907B3 (en) * 2003-03-13 2004-01-08 Bayer Ag Sound- and heat-insulating construction element

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018140553A (en) * 2017-02-28 2018-09-13 パナソニックＩｐマネジメント株式会社 Composite materials and devices using such composite materials

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2525051A1 (en) * 1974-06-04 1976-04-29 Scott Paper Co PERFORATED, PROFILED FILM-FOAM LAMINATES

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69210997T3 (en) * 1991-04-30 1999-12-16 Dow Chemical Co PERFORATED PLASTIC FOAM AND ITS PRODUCTION PROCESS
ATE149910T1 (en) * 1992-12-15 1997-03-15 Scriptoria Nv FOAM SHEETS MADE OF POLYOLEFINS
HUP0103869A3 (en) * 1998-09-17 2003-05-28 Dow Global Technologies Inc Mi Perforated foams

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2525051A1 (en) * 1974-06-04 1976-04-29 Scott Paper Co PERFORATED, PROFILED FILM-FOAM LAMINATES

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10310907B3 (en) * 2003-03-13 2004-01-08 Bayer Ag Sound- and heat-insulating construction element
EP1457611A2 (en) 2003-03-13 2004-09-15 Bayer MaterialScience AG Sound and heat insulating building element
EP1457611A3 (en) * 2003-03-13 2006-09-06 Bayer MaterialScience AG Sound and heat insulating building element

Also Published As

Publication number Publication date
JP2003518538A (en) 2003-06-10
CA2394760A1 (en) 2001-07-05
MXPA02006238A (en) 2003-01-28
AU2008301A (en) 2001-07-09
KR20020063920A (en) 2002-08-05
EP1244734A1 (en) 2002-10-02
WO2001048069A1 (en) 2001-07-05
BR0016698A (en) 2002-09-24

Similar Documents

Publication Publication Date Title
DE60015428T2 (en) Honeycomb core with controlled squeezing properties
DE69924091T2 (en) Partially perforated foam
EP2501749B1 (en) Resin foams containing microballoons
DE3002775A1 (en) METHOD FOR PRODUCING A SOUND ABSORBING MATERIAL AND METHOD PRODUCED BY THE METHOD
DE2854544C2 (en) Process for the production of a fiber-reinforced integral foam molded part
DE2019488C3 (en) Foam body and process for its manufacture
DE3905607A1 (en) LAYER BUILDING FOR THE PRODUCTION OF SOUND INSULATIONS, SOUND INSULATIONS AND METHOD FOR THE PRODUCTION OF THE LAYER BUILDING OR OF SOUND INSULATION
DE2508557A1 (en) DEVICE AND METHOD FOR MANUFACTURING PLASTIC LAYERED MATERIAL
DE2061121A1 (en) Liquid permeable polyolefin foams and processes for their manufacture
EP2641786A1 (en) Interior trim part, in particular instrument panel comprising an airbag flap
DE3235166A1 (en) METHOD AND DEVICE FOR PRODUCING A PARTICULARLY MULTICOLOR PATTERNED PLASTIC RAIL
DE2700907A1 (en) LAMINATE BUILDING PANELS AND METHOD OF MANUFACTURING THE SAME
DE19962865C1 (en) Shaped polymer foam component for sound absorption purposes in automobiles is provided with perforations in its compacted surface layer
DE2611855A1 (en) Foam-backed carpeting for motor vehicle - with perforated absorbent plastic film between carpet and foam
DE102016222328A1 (en) Method for producing a sound-absorbing component, in particular a trim part, for a motor vehicle, and sound-insulating component
DE3247343A1 (en) Moulded articles consisting of surface-laminated, binder-containing fibres or particulate materials which are pressed with the application of pressure and heat
DE102013020488A1 (en) Method for producing a sandwich composite component
DE102018129444B4 (en) Complex structural material, resin part, method of manufacturing a resin part
DE877948C (en) Process for the production of air-permeable foam sheets covered with textiles
DE102005003994A1 (en) Acoustic absorber for motor vehicle, multiple hollow chamber units connected to flat absorber part and formed from same foil material, where chamber units are filled with air and foil material is formed by flexible plastic foils
DE2453224C3 (en) Support plate for electrical equipment
DE4241750C2 (en) Process for the production of a sandwich-like body or housing part
DE2832569A1 (en) Sound absorbent panels - pref. made of closed-cell polyethylene
DE19812756A1 (en) Breathable membrane
EP1764204A2 (en) Method of manufacturing blocks or webs of foam pieces

Legal Events

Date Code Title Description
8100 Publication of the examined application without publication of unexamined application
D1 Grant (no unexamined application published) patent law 81
8363 Opposition against the patent
8331 Complete revocation