WO2018177573A1 - Corps creux en matière plastique à effet acoustique et son procédé de fabrication - Google Patents

Corps creux en matière plastique à effet acoustique et son procédé de fabrication Download PDF

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Publication number
WO2018177573A1
WO2018177573A1 PCT/EP2017/077105 EP2017077105W WO2018177573A1 WO 2018177573 A1 WO2018177573 A1 WO 2018177573A1 EP 2017077105 W EP2017077105 W EP 2017077105W WO 2018177573 A1 WO2018177573 A1 WO 2018177573A1
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WO
WIPO (PCT)
Prior art keywords
layer
plastic
acoustically effective
fibers
shaped
Prior art date
Application number
PCT/EP2017/077105
Other languages
German (de)
English (en)
Inventor
Markus Luger
Richard Geissler
Paul SCHÖNZART
Original Assignee
Carcoustics Techconsult Gmbh
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 Carcoustics Techconsult Gmbh filed Critical Carcoustics Techconsult Gmbh
Priority to CN201721628655.9U priority Critical patent/CN208841986U/zh
Priority to CN201711234908.9A priority patent/CN108688275A/zh
Publication of WO2018177573A1 publication Critical patent/WO2018177573A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/20—Making multilayered or multicoloured articles
    • B29C43/203—Making multilayered articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D22/00—Producing hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/02—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose in the form of fibres or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B23/08—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • B29C2043/022—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface having locally depressed lines, e.g. hinges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • B29C2043/3613—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons applying pressure locally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/56—Compression moulding under special conditions, e.g. vacuum
    • B29C2043/566—Compression moulding under special conditions, e.g. vacuum in a specific gas atmosphere, with or without pressure
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/002—Panels; Plates; Sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B32B2262/0284—Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/04—Cellulosic plastic fibres, e.g. rayon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • B32B2262/062—Cellulose fibres, e.g. cotton
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • 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
    • B60R13/0838—Insulating elements, e.g. for sound insulation for engine compartments
    • 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
    • B60R13/0876—Insulating elements, e.g. for sound insulation for mounting around heat sources, e.g. exhaust pipes

Definitions

  • the present invention relates to the field of production of acoustically active hollow bodies made of plastics, in particular a method for producing acoustically effective plastic höh I emotionsn means of a heated mold. Furthermore, it relates acoustically effective plastic height I emotions with novel properties.
  • Sound absorbers having a bottom part and a structural part are known from the prior art, wherein hollow chambers are formed in the structural part, which have chamber walls and are formed like a box or cup, and where the bottom part is also connected to the structural part, for example welded is.
  • Such an absorber is, for example, from DE-OS 27 58 041 known.
  • the hollow chambers of the structural part are covered by a flat film as the bottom part, which closes each of the air volumes contained in the individual hollow chambers airtight.
  • DE-OS 40 11 705 a further embodiment of such a sound absorber is known from DE-OS 40 11 705, in which the structural part is connected to the bottom part only at the edge. The connection is created here via an elastic sealing lip. Overall, the sound absorber can be manufactured in this way in the blow molding process.
  • Embodiments are also known in which each hollow chamber is connected to the bottom part, but such a hollow chamber open at the top is designed in each case as a Helmholtz resonator.
  • DE-PS 32 33 654 sound absorber individual separated hollow chambers are also formed, which, however, have a structuring in the form of a groove on the upper side.
  • a blow-molded sound absorber with a bottom part and a structural part wherein in the structural part hollow chambers are formed, which have chamber walls and box- or cup-shaped.
  • the bottom part is connected to the structural part, for example. Welded.
  • the hollow chambers are open on one side.
  • Extrusion blow molding a tube is extruded from a thermoplastic material, which expands by means of injected air and the cavity of a heated mold is supplied. In the cavity then more complex shaped, seamless hollow body can be formed. The structure debilitating seams can be minimized in this way.
  • a disadvantage of the blow molding is the relatively high mechanical complexity, which prohibits the use of this technique for small batches.
  • combinations of different materials z. B. not possible with different chemical or physical properties.
  • the introduction of other materials in the interior of a blow-molded component during its production is virtually impossible.
  • a plastic height I emotions comprising a composite material consisting of a form-stamped plate or foil-shaped first layer of a thermoplastic first plastic, a possibly form-stamped plate or foil-shaped second layer of a second plastic, and one between the first and second layers arranged to disclose or mixed cellular foam layer of a third plastic known.
  • an advantageous manufacturing method for such hollow plastic body and their advantageous use as a soundproofing element, in particular as an engine compartment capsule for a motor vehicle disclosed. It is apparent from EP 2 314 437 A1 that the process disclosed therein is intended to provide a blow molding alternative process for the production of plastic high I emotionsn.
  • the introduction of a layer of open or mixed cellular foam into the interior of the plastic hollow body plays a central role.
  • the Foam layer at least partially compressed, while the escaping from the cells of the foam air is used to expand the plastic hollow body outside the compressed areas.
  • Object of the present invention is therefore to provide a plastic height I emotions with improved acoustic properties and a method for its preparation.
  • An inventive, acoustically effective plastic height IME comprises a composite material which has at least the following constituents:
  • thermoplastic first plastic A stamped, plate-shaped or foil-shaped first layer of a thermoplastic first plastic
  • the acoustically effective position is compressed at least in sections according to the embossing of the first layer and / or the second layer.
  • the plastic height I body is preferably formed so that the acoustically effective position is substantially only in the compressed portions in mechanical contact with the first and / or the second layer.
  • I advantageous air or gas-filled cavities or chambers. But it is also possible that the acoustically effective position substantially completely fills the resulting cavities or chambers.
  • acoustically effective position is understood as meaning a layer which has sound-absorbing or / and sound-insulating properties.
  • An inventive plastic height I economist can be used, for example, outstanding for the production of acoustically active components for use in the engine compartment of a motor vehicle, for. B. engine compartment capsules, which are arranged below the engine compartment and complete this against the vehicle environment.
  • the hollow plastic body forms cavities which are generally acoustically effective.
  • these cavities can form acoustic chamber resonators, the z. B. can be box-shaped. These cavities may in particular be formed exclusively in the first position. However, it is also possible for individual or all cavities, in particular boxes, to be formed jointly by the first and the second layer.
  • the dimensions of the cavities, in particular boxes, are preferably chosen so that they have an increased acoustic absorption in those frequency ranges in which an effective attenuation of sound is desired.
  • suitable chamber resonators and their acoustic properties reference is made to the teaching of the state of the art cited in the introductory part and in particular to the technical teaching of EP 2 314 437 A1.
  • This preferred embodiment is particularly suitable for the realization of engine compartment capsules of a motor vehicle, wherein the first layer forms the acoustically effective cavities and is preferably oriented toward the engine compartment when the engine compartment capsule is mounted.
  • the acoustically effective layer in the hollow plastic body according to the invention preferably has a thickness of at least 5 millimeters, preferably at least 8 millimeters and particularly preferably at least 12 millimeters, in the non-compressed regions. But there are possibly larger thicknesses possible.
  • the acoustically effective layer in the plastic according to the invention preferably has a thickness of not more than 4 millimeters, preferably not more than 3 millimeters and particularly preferably not more than 2 millimeters, in the compressed regions. But it may be possible to smaller thicknesses.
  • the basis weight of the acoustically effective third layer is typically in the range of 200 to 400 g / m 2, in particular about 300 g / m 2, when the acoustically effective layer has primarily sound-absorbing properties.
  • the acoustically effective layer is primarily intended to have sound-insulating properties, then a weight per unit area of such a sound-insulating layer between typically 500 and 1000 g / m 2 has proven to be advantageous. Particularly preferred is a basis weight of 600 to 800 g / m2.
  • the acoustically effective third layer has a first partial layer which has sound-absorbing properties, and a second partial layer which has sound-insulating properties.
  • the first partial layer may be formed as a nonwoven, in particular as a cover fleece.
  • the preferred basis weights of the partial layers correspond to those given above.
  • the second sub-layer may be formed as a fiber mat, which may in particular be needled.
  • the sound-absorbing sub-position is immediately adjacent to the second layer, as in this way an effective Bedämpdung the second layer results, which positively influences the acoustic properties of the hollow body according to the invention.
  • the second sub-layer can also be oriented in the direction of the first layer of the hollow plastic body and thus protrude into the cavities of the hollow body.
  • the first layer in the compressed sections is welded to the second layer and / or to the acoustically effective layer, preferably thermally.
  • This welding is advantageously carried out in such a way that the welding connects the material composite at least partially edge.
  • the plastic hollow body includes a substantially completely closed airspace, z.
  • substantially completely circulating e.g. thermal, welding.
  • this fully contained airspace may in turn be subdivided into a plurality of mutually closed partial air spaces, but need not be.
  • the first and the second plastic can be chemically and / or physically different from each other, but need not.
  • the first and the second plastic may have different colors from each other, resulting in design advantages, the z. B. in the manufacture of soundproofing elements with a visible side and a functional side can be relevant.
  • the plate or foil-shaped first plastic other mechanical properties than the plate or foil-shaped, second plastic, z. B. by different material thicknesses of the same plastic material or different materials are used.
  • either the first or second plastic or both plastics may be a fiber reinforced plastic (e.g., GMT, LWRT) having high impact resistance.
  • a combination which has proven particularly advantageous is a second layer made of a fiber-reinforced plastic and a first layer made of a fiber-reinforced plastic. filled / non-reinforced thermoplastic such as PP, which can be thermoformed very well.
  • PP non-reinforced thermoplastic
  • Such a combination of materials can be z.
  • the second layer in the ready-to-use hollow plastic body forms mechanically stiffening ribs. These stiffen the second layer so that vibrations of the second layer and thus also of the entire hollow plastic body are damped or shifted into a higher frequency range.
  • These ribs are formed either in the implementation of the method according to the invention in the closed mold in the second layer, or the second layer already has in the cavity of the mold supplied composite material comprising at least the first layer, the second layer and the interposed acoustically effective position , Suitable ribs, which remain at least partially preserved in molding the plastic high-I body in the closed mold.
  • the fibrous composite used for the acoustically effective layer of the plastic according to the invention comprises natural fibers, fibers of a third plastic and / or fibers of a mineral material or a mixture thereof.
  • Natural fibers may be especially fibers of plant or animal origin, such. B. cotton or flax.
  • the use of a so-called cotton fiber fleece has proven particularly suitable.
  • the fibrous composite used for the acoustically effective layer of the plastic according to the invention comprises recycled fiber from industrial waste.
  • these may include all the aforementioned fiber types.
  • the aforementioned cotton fiber nonwoven may contain or consist of recycled industrial fiber waste fibers.
  • the first plastic is a thermoplastic.
  • the second and possibly also the third plastic is a thermoplastic.
  • both the first and the second or third plastic can advantageously be selected from the group consisting of the materials ABS, GMT, LWRT, PMMA, PVC, PE, PET, PS, PP, PSEVOHPE, PPEVOHPE, PEEK.
  • the second and / or in particular the third plastic can also be a thermoset, z. As an aramid, or an elastomer.
  • the first and the second plastic be welded together, in particular by means of thermal welding. Furthermore, it has proven to be advantageous if the third plastic - if present - with the first and / or the second plastic is welded, preferably thermally. Both are the subject of advantageous developments of the plastic invention height I stressess.
  • a proportion of at least 40%, preferably at least 50% and particularly preferably at least 60% of the fibers contained in the fibrous composite has a maximum fiber weight of 8 dtex, preferably of at most 4 dtex and more preferably of maximum 1 dtex. In the latter case, therefore, a fine fiber fleece is used.
  • These fiber weights are particularly advantageous when the fibrous composite comprises fibers of plastics or, in particular, consists of such fibers.
  • the acoustically effective layer has those acoustic properties that are necessary for realization the desired acoustic properties are required.
  • the acoustic absorption behavior in particular with regard to the frequency, can be adjusted in a targeted manner by selecting suitable fiber strengths of the fibrous composite of the acoustically effective layer.
  • the hollow body according to the invention differs in particular substantially from the known from EP 2 314 437 AI hollow body. Its acoustic properties are primarily determined by the trained cavities forming acoustically effective resonators, and secondarily by the acoustic properties of the foam layer provided there.
  • the acoustic properties of the foam layer unlike the properties of the acoustically effective layer based on a fibrous composite - in particular with respect to their respective frequency response is not practically adjustable.
  • the acoustic properties of the hollow body according to the invention can therefore be tailored to the specific requirements of the intended use of the hollow body.
  • the sound attenuation values achievable with the hollow plastic body according to the invention can in some cases be significantly greater than the sound attenuation values obtainable with the hollow plastic body known from EP 2 314 437 A1.
  • the acoustically effective layer of a fibrous composite can be tuned to have high acoustic attenuation values at higher frequencies. Cavity resonators, however, have good absorption values, especially at lower frequencies.
  • the fibrous composite further contains binder fibers, which consist at least partially of a thermoplastic or thermosetting plastic.
  • binder fibers consist at least partially of a thermoplastic or thermosetting plastic.
  • the proportion of binding fibers in the acoustically effective layer of a fibrous composite is between 10% and 50%, preferably between 20% and 40%.
  • the binding fibers introduced into the fibrous composite ensure that the structure impressed in the acoustically active layer manufacturing method discussed in more detail below is permanently retained and no relaxation of the layer into the uncompressed state occurs.
  • the binding fibers may consist of a single material, but they may also have different materials. As a material, for example, PP has been proven.
  • the binder fibers have a fiber weight between 2 and 6 dtex, preferably between 4 and 5 dtex. But higher or especially lower fiber weights are possible.
  • the binding fibers are designed as bicomponent fibers, ie they comprise two different, in particular polymeric, materials.
  • fibers may be mentioned which have a core of a thermosetting, thermosetting polymer (for example a so-called "thermosetting resin") surrounded by a shell a thermoplastic polymer.
  • thermosetting resin for example a so-called "thermosetting resin”
  • a thermoplastic polymer for example a so-called "thermosetting resin”
  • the heat-curing thermoset core ensures a fixation of the locally compressed fiber composite in the still hot state in which the thermoplastic material of the shell is still flowable and therefore unfolds only a small binding effect.
  • Binding fibers have proved to be particularly advantageous which consist of at least two thermoplastic components which have different melting points.
  • an internal core may consist of a first thermoplastic which has a high melting point, for example above 130 ° C., preferably above 150 ° C. and particularly preferably above 170 ° C.
  • This core may be surrounded by a jacket of a second thermoplastic having a low melting point, which is preferably below 130 ° C, more preferably below 120 ° C.
  • the melting points of the two thermoplastics are at least 30 ° C apart, preferably by at least 50 ° C, more preferably by 100 ° C or more.
  • the two thermoplastics can be chemically identical, but have different degrees of crosslinking and / or chain lengths.
  • PP has proven.
  • the higher melting core assumes the function of the duroplastic hardening portion of the preceding embodiment.
  • the fibrous composite further contains a reacted and thus crosslinked binder, which may comprise or consist of, for example, a fully reacted phenolic resin and / or a fully reacted melamine resin.
  • a crosslinkable binder introduced into the fibrous composite prior to carrying out the production process according to the invention ensures that the structure impressed in the course of the manufacturing process of the acoustically effective layer is permanently retained and no relaxation of the layer into the uncompressed state occurs.
  • the crosslinking binder can be present in powdered form in the unprocessed composite material comprising at least the plate-shaped first layer, the plate-shaped second layer and the acoustically active layer of a fibrous composite and contain the mentioned resins in a reactive form.
  • crosslinking / crosslinked binder has proven to be particularly advantageous when the acoustically effective layer comprises or consists of mineral fibers.
  • the plastic height I entrepreneurial can be produced particularly simply and efficiently by means of a preferred embodiment of the method according to the invention described below.
  • the possibly present third plastic of the acoustically effective layer can be thermally welded to the first and / or the second plastic.
  • the plate-like or foil-shaped first layer or the plate-like or foil-shaped, second layer is covered with a cover fleece, wherein the cover fleece is arranged on the outer surface of the plastic height I emotionss.
  • This cover fleece can on the one hand be provided to change the appearance of the hollow plastic body and in particular to improve. On the other hand, it can change the mechanical properties of the layer and in particular improve it on which it is arranged. In particular, the cover fleece can improve the abrasion resistance and / or the impact resistance of the layer.
  • the cover fleece is not in surface contact with the entire first layer, but only with edge regions of the first layer and the resulting by the partial compression of the first layer and the acoustically effective position sublime areas of the first location. In this embodiment, this spans Cover fleece z. B. thermoformed first layer to form further cavities, which also have an acoustic effectiveness, resulting in further advantages in the acoustic behavior of the inventive acoustically effective plastic height I stressess.
  • the cover fleece consists of fibers of a fourth plastic, natural fibers or mineral fibers, or a mixture thereof.
  • Nonwovens made of glass fibers can be used particularly advantageously.
  • the cover fleece consists of a fourth plastic
  • this is selected from the group consisting of thermoplastic, thermoset or elastomer, wherein the use of a thermoplastic material analogous to the plastic of the first layer or a thermosetting plastic such as aramid has proven to be advantageous.
  • the fourth plastic with the plastic of that layer is welded, in particular thermally welded, on the outer surface of the cover fleece is arranged.
  • the plastic hollow body according to the invention further comprises at least one thermally active metal foil.
  • the metal foil increases by their heat-reflecting ability, the thermal resistance of the plastic hollow body according to the invention, so that it can also be used in areas with increased heat input, z. B. in the vicinity of the exhaust line of a motor vehicle with internal combustion engine.
  • the metal foil can cover the entire outer or inner surface of the first or second layer, or only partial areas thereof.
  • the metal foil is preferably made of a metal with high reflectivity for heat radiation and may for example consist of aluminum or an aluminum foil.
  • the thickness of the metal foil depends on the material used and is typically between 50 and 250 microns, preferably about 100 microns.
  • the metal foil is preferably introduced in the production of the hollow plastic body according to the invention in addition to the material composite consisting of first layer, second layer and acoustically effective position in the open cavity of the mold, ie the material composite supplied to the cavity in the production process according to the invention is supplemented by a metal foil.
  • the metal foil is at least in the compressed areas thermally z. B. welded to the thermoplastic material of the first layer.
  • the first layer can be achieved if the metal foil 3 is provided with a thermally activatable adhesive layer at least on its surface facing the first layer. This adhesive layer can be thermally activated in the closed mold. In this way, a permanent connection between metal foil and z. B. first layer can be generated.
  • the metal foil is coated on its surface facing away from the first layer with a thermally activatable adhesive layer.
  • the metal foil is coated on both sides with a thermally activatable adhesive layer.
  • the metal foil, the entire surface z. B. covers the first layer. But it can also be provided that the metal foil only such portions z. B. the first layer covered, in which an increased heat input at a proper use of the plastic height I stressess is to be expected.
  • These subregions may be characterized, for example, in that they are spatially adjacent to the exhaust gas line of a motor vehicle.
  • such a metal foil can encompass a passage of a heat-radiating component, such as an exhaust pipe, through the plastic according to the invention, which is higher than the body.
  • plastics used in the plastic according to the invention are chemically identical, that is to say in particular the first and the second plastic or the first, second and third plastics or the first, second, third and fourth plastics, this results in particular advantages when recycling the plastic Plastic hollow body according to the invention.
  • This embodiment is therefore the subject of a particularly preferred development.
  • the inventive method is provided for the production of plastic höh Iarchitecten, and comprises the following steps:
  • thermoplastic first plastic o a plate-shaped or foil-shaped first layer of a thermoplastic first plastic
  • the procedure according to the invention allows the production of plastic hollow bodies whose interior is completely or partially filled with an acoustically effective layer of a fibrous composite.
  • the process control can be chosen so that in the mold, the first and / or second layer of the acoustically effective position dissolves, such that the acoustically effective position substantially only in the compressed sections in mechanical contact with the first and / or second position.
  • the process control can be chosen so that in the mold, the first and / or second layer of the acoustically effective position dissolves, such that the acoustically effective position substantially only in the compressed sections in mechanical contact with the first and / or second position.
  • an air / gas-filled cavity which can be advantageously completed on all sides.
  • air- or gas-filled cavities can be supported by air is sucked out of the cavity when closing the mold.
  • a negative pressure in the cavity can be generated when the air is drawn off.
  • a plurality of suction openings can be formed in the surfaces of the molding tool, via which at least the heated and thus deformable first layer can be said to the tool surface. It can therefore be provided to vacuum-draw the first layer in the mold.
  • Those surfaces of the molding tool on which the second layer comes to rest in the closed mold can be configured analogously. It can therefore be provided to vacuum-draw also the second layer in the mold.
  • air or an inert filling gas can be injected between the first layer and the acoustically effective layer and / or the second layer and the acoustically effective layer, which increases the formation of air- or gas-filled structures in the plastic according to the invention additionally transported.
  • the first layer in the pressurized sections is preferably thermally welded to the second layer and / or to the acoustically effective layer.
  • This can be z. B. by the mold itself when closing the mold.
  • the welding can also be carried out by means of other welding techniques.
  • the welding can be carried out in such a way that it connects the material composite mechanically, at least peripherally, peripherally, but preferably completely circumferentially, so that an interior completely closed against the environment is created.
  • the welding of the first plastic läge with the acoustically effective position and / or the second plastic layer is thus preferably carried out so that the resulting plastic hollow body includes a substantially completely closed air / gas space.
  • the acoustically effective layer comprises binding fibers. These preferably have thermoplastic properties and are adapted to the conditions in the closed heated mold that the bonding fibers melt in the closed heated mold.
  • the binder fibers preferably thermosetting properties such that a certain proportion of the binder fibers cures at elevated temperatures thermosetting.
  • this portion of the binding fibers may for example consist of a so-called "thermosetting resin", ie of a thermosetting resin which has thermosetting properties in the cured state
  • the binding fibers are chosen adapted to the conditions in the closed heated mold that the aforesaid portion of the binder fibers in the closed heated mold thermally cures to a thermoset.
  • the binder fibers preferably comprise a core of a higher melting thermoplastic and a shell of a lower melting thermoplastic.
  • the material of the core is selected so that it substantially does not melt in the production of the plastic according to the invention in the closed mold, but essentially retains its shape.
  • the material of the lower melting jacket is chosen so that the shell substantially melts and loses its shape during the production of the plastic according to the invention in the closed mold so that the softened or molten material of the jacket penetrates the fibers of the fibrous composite and together can stick together.
  • Fig. 1 u. 2 a composite material for carrying out the method according to the invention
  • 3 and 4 introduced into the open cavity of a mold material composite
  • FIG. 11 shows a fifth variant of a product according to the invention produced according to a development of the method according to the invention
  • the method according to the invention is also referred to as "expansion molding presses.”
  • identical reference symbols designate the same components.
  • FIG. 1 shows the individual constituents of a composite material with which the method according to the invention is carried out.
  • the composite material comprises a first layer 10 consisting of a thermoplastic material such as PP or PET, which is plate-shaped and has a thickness in the range between 0.5 and 2.5 mm.
  • a second layer 20 is arranged, which is also made of a thermoplastic material such as PP or PET of the same thickness.
  • the plastic used can be fiber-reinforced, z. B. by means of glass fibers. Additionally or alternatively, the second layer 20 may have an increased thickness which is in the range between one and five millimeters.
  • the plate-shaped first layer 10 and the plate-shaped second layer 20 can be obtained for example by cutting sections of defined length of a continuous material, which is wound on a suitable supply reel.
  • an acoustically effective layer 30 is arranged, which consists of a fibrous composite.
  • the fibrous composite is formed as a nonwoven.
  • the fiber weight of the fibers in the nonwoven is typically between 0.1 and 8 dtex, preferably a fiber weight of 4 dtex, particularly preferably 1 dtex, is not exceeded.
  • the thickness of the acoustically effective layer is usually between one and twenty millimeters, preferably between 5 and 15 millimeters. But it can also be above and below.
  • the basis weight of the acoustically effective third layer is typically in the range of 200 to 400 g / m 2, in particular about 300 g / m 2, when the acoustically effective layer has primarily sound-absorbing properties. If, on the other hand, the acoustically effective layer is primarily intended to have sound-insulating properties, then a weight per unit area of such a sound-insulating layer between typically 500 and 1000 g / m 2 has proven to be advantageous.
  • a cotton fine fiber fleece is used as the acoustically effective layer 30 made of a fibrous composite.
  • a proportion of about 20-40%, preferably 25%, of the fibers contained in the fibrous composite consists of bicomponent binder fibers, which have a thermosetting in the mold dimensionally stable core of a higher melting first thermoplastic, that of a jacket made of a thermoplastic material surrounded, which has a lower melting or softening point and melts or softened under heat in the mold.
  • the inner core consists of a first thermoplastic, which has a melting point of 220 ° C, namely higher crosslinked, longer-chain PP.
  • the jacket consists of a second thermoplastic having a melting point of 100 ° C, namely lower crosslinked, shorter-chain PP.
  • the thermoplastics of core and shell are therefore chemically identical, but have different degrees of crosslinking and chain lengths and thus different softening or melting temperatures.
  • a fleece made of a mixture of PET fibers and viscose fibers is used as the acoustically effective layer 30 of a fibrous composite.
  • a proportion of about 20-40%, preferably 25%, of the fibers contained in the fibrous composite in turn, consists of bicomponent binder fibers which have a duroplastic thermosetting core surrounded by a shell, which is surrounded by a thermoplastic material.
  • a fine fleece made of PET fibers is used as the acoustically effective layer 30 made of a fibrous composite.
  • a proportion of about 20-40%, preferably 25%, of the fibers contained in the fibrous composite consists of binding fibers of a thermosetting thermosetting plastic under heat.
  • bicomponent binding fibers can also be used as in the preceding exemplary embodiments.
  • the binding fibers have a max. Fiber weight of 6 to 7 dtex, preferably the fiber weight is below.
  • a fleece made of glass or mineral wool is used as the acoustically effective layer 30 made of a fibrous composite.
  • the acoustically effective third layer 30 can be obtained by cutting sections of defined length of an endless material, which is wound in each case on a suitable supply reel.
  • Mat-shaped fibrous material is often available as continuous material due to production, which can be wound on supply spools. This makes the handling of the fibrous material for forming the third layer 30 in the context of a method according to the invention is particularly simple and represents a further advantage of the present invention over the hollow plastic body, which is known from EP 2 314 437 AI, as well as its production. Since foams As block products are produced, mat-shaped layers of a foam must generally be obtained by splitting foam blocks. This represents an additional workload in the production of hollow plastic bodies according to EP 2 314 437 Al, which can be saved in the context of the manufacturing method according to the invention.
  • FIG. 1 depicts the individual layers of the material composite individually for clarification
  • FIG. 2 shows the material composite in the form in which it is supplied to the cavity of a molding tool 40.
  • FIG 3 the open cavity of a mold is now shown, which forms a first mold half 40 and a second mold half 45.
  • the two mold halves 45 are heated and movable relative to one another, so that the cavity formed between the mold halves 40 and 45 can be closed.
  • a corresponding mold is widely known from the prior art and is therefore not described in detail.
  • the mold can be heated directly by integrated in the mold halves 40, 45 heating elements. However, it can also be arranged on heated tool tables of a hot plate press, so that heating of the mold halves 40, 45 via the not shown in Figure 3 Tool tables done.
  • Conventional operating temperatures for the molds are in the range of 250 ° C to about 350 ° C, depending on the (thermoplastic) plastic material used for the first layer 10 and optionally second layer 20, preferably in the temperature interval between 250 ° C - 270 ° C and 300 ° C.
  • FIG. 4 now shows the incipient closing of the molding tool by moving the mold halves 40, 45 relative to one another, wherein the material composite introduced into the cavity of the molding tool is also shown. It is indicated by arrows that the thickness of the acoustically effective layer 30 is less than the depth of the form formed in the upper mold half 40 structures.
  • FIG. 5 shows the compression of the composite of material occurring during continued closing of the mold halves, which is accompanied by a detachment of the first layer 10 from the underlying acoustically effective layer 30 in the region of the cavities of the first mold half 40 of the mold marked 50. In these areas, the acoustic layer 30 is less compressed than in the surrounding areas.
  • FIG. 6 shows the closed state of the molding tool in which box-like structures have formed in the first layer 10 due to thermal deformation of the first layer 10. Furthermore, an irreversible deformation of the acoustically effective layer 30 has taken place in the sections pressurized by the mold halves 40, 45 of the mold, which is accompanied by a thermal fusion of the composite material in these areas.
  • an air-filled volume which is designated 60.
  • the shape of the mold is chosen so that the interior of the resulting box structure is completely closed to the environment. This is ensured by an all-round thermal welding of the composite material by an uninterrupted weld.
  • the formation of the air-filled box structures in the context of the method according to the invention cited above is primarily based on the fact that, when the mold halves 40 and 45 of the mold are moved in, air flows over the surface of the mold.
  • the suction openings (not shown) of the first (upper) mold half 40 of the mold are sucked out of the cavity of the mold.
  • the first layer 10 made movable by heating is "sucked" into the box structures of the upper mold half 40 of the mold.
  • This evacuation of the interior of the cavity is indicated by the arrows pointing out of the cavity in FIG.
  • air- or gas-filled (here: box) structures in the context of the exemplified manufacturing process is further supported by additionally air or (inert) gas is injected during the feeding of the composite material to the cavity of the mold, in the area trapped between the acoustically effective layer 30 and the first layer 10 and / or the second layer 20.
  • air or (inert) gas is injected during the feeding of the composite material to the cavity of the mold, in the area trapped between the acoustically effective layer 30 and the first layer 10 and / or the second layer 20. This can be done, for example, when feeding the plate-shaped, first layer 10 and the plate-shaped acoustically effective layer 30 in which compressed air or another inert gas is injected between these layers.
  • the box structure resulting in the embodiment of the method according to the invention in the embodiment discussed is again shown in FIG. 7 in a first variant in which the special process control ensures that a residual material thickness d of the acoustically effective layer 30 remains in the compressed sections 70 of the structure ,
  • This residual material thickness d can be adjusted in a targeted manner by the process control and the shaping of the molding tool.
  • a cotton fiber fleece can be used as a fibrous composite for the acoustically effective layer 30, it is typically between 0.1 and 1 mm.
  • FIG. 8 shows a second product variant, which substantially corresponds to the product variant shown in FIG.
  • a fibrous composite of the acoustically effective layer 30 a fine fiber non-woven fabric made of a thermoplastic such as PP or preferably PET was chosen.
  • the thickness of the fibrous web essentially corresponds to the thickness of the cotton fiber fleece used in the first product variant.
  • the process control in the manufacture of the product shown in Figure 8 has been chosen so that in the compressed sections 70 of the thermoplastic fibrous composite of the acoustic layer 30 has been almost completely displaced.
  • FIG. 9 shows a third variant of the finished product, which was produced by means of a molding tool in which the lower mold half 45 also has such a structuring that the second layer 30 is also subjected to punctiform pressure, so that opposing indentations in both the first layer 10 as well as in the second layer 20 are formed.
  • the mold halves 40 and 45 of the mold are moved in, air is sucked out of the cavity of the mold via suction openings (not shown) formed in the surface of the first (upper) mold half 40 and the second (lower) mold half 45 of the mold.
  • FIG. 10 shows a fourth variant of the finished product, which was produced by means of a molding tool, in which also the lower mold half 45 has a structuring like the second (lower) mold half of the mold shown in FIG.
  • the second layer 30 also forms box-like air volumes 60, which are directed counter to the box structure formed in the first layer 10, but need not necessarily have the same geometry.
  • the boxes forming in the second layer 20 may extend in the same direction as the boxes in the first layer 10 so that the second layer boxes reach into the first layer boxes.
  • the second layer 30 is preferably pressurized selectively when closing the mold, so that advantageously at least selectively opposite indentations in both the first layer 10 and in the form second layer 20.
  • it is particularly easy to displace virtually all of the material of the acoustically effective layer 30 from the compressed sections 70, in particular if a thermoplastic material is used for the fibrous composite of the acoustically effective layer 30, and thus in turn to a mechanical one To achieve particularly high-strength welding of the first layer 10 with the second layer 20.
  • the first and the second plastic can be chemically and / or physically different from one another.
  • the first and the second plastic may have different colors from each other, resulting in design advantages, e.g. in the production of soundproofing elements with a visible side and a functional side can be relevant.
  • the product variants according to FIGS. 7 to 10 can be used in particular as effective acoustic damping elements for building acoustics, the variants according to FIGS. 7 and 8 having particular optical advantages due to the formation of a flat visible side. This can, for.
  • Example 10 by appropriate shaping of the mold half used for the expansion presses, in which the second layer 20 comes into abutment during the expansion press, patterned to produce a visually pleasing decoration of the visible side. Also, by introducing an additional decorative layer (not shown) into the mold used for the expansion press either the first layer 10 and / or the second layer 20 can be provided with an advantageous surface texture, for.
  • an embossable layer on the outside of the finished product, e.g. may consist of a nonwoven fabric is embossed with the first and / or the second layer 20.
  • the variant according to FIG. 9 has a particularly high mechanical stability, whereas the variant according to FIG. 10 shows a particularly high acoustic effectiveness.
  • All product variants have the advantage that the enclosed in the forming air- or gas-filled structures interior of the produced acoustically active element is completely protected against environmental influences. This makes use in areas with increased hygienic requirements, eg. As in the sanitary area, in swimming pools or in hospitals and slaughterhouses, where a simple and residue- free removal of hygienic contaminants such. B. is required by means of direct spraying with a dissolved in water detergent, particularly advantageous.
  • all product variants can be used advantageously as ceiling or wall elements or as suspended or standing soundproofing panels in the building acoustics, z. B. in areas with high noise pollution by machines in the office z. B. as a room divider or in public buildings with high noise pollution, e.g. in schools and colleges, kindergartens, public authorities, railways and airports.
  • the feasible hermetic encapsulation of the gas or air space enclosed in the elements is particularly advantageous because of the increased risk of contamination.
  • the plate- or foil-shaped first plastic may have different mechanical properties than the plate- or foil-shaped second plastic, for. B. by different material strengths of one and the same plastic material can be used.
  • either the second plastic may also be a fiber reinforced plastic (GMT, LWRT) having high impact strength.
  • the first plastic can be an unfilled / non-reinforced thermoplastic such as PP, which can be thermoformed excellently.
  • PP fiber reinforced plastic
  • Such a combination of materials can be z. B. advantageous for the production of acoustically effective engine compartment capsules, wherein the reinforced side facing the vehicle underbody and the PP side to the engine compartment. The PP side then forms the acoustically effective structures.
  • the product variants according to FIGS. 7, 8 and 9 could also reproduce such an engine compartment capsule.
  • the product according to the invention has the particular advantage that a wide variety of material combinations of first layer 10 and second layer 20 can be displayed, which makes it possible, in particular, to realize individual aesthetic designs, for example by different colors of first layer 10 and second layer 20.
  • special requirements for the physical or chemical properties of the first layer 10 and the second layer 20 can be realized.
  • reference is made to an engine compartment capsule for a motor vehicle as results, for example, from EP 0 775 354 B1.
  • the underside of the Motorra to kapsei at the same time forms the vehicle underside and therefore must have an increased mechanical strength.
  • thermoplastics such as GMT or LWRT.
  • acoustic properties are obtained if the box structure directed towards the engine compartment is made of a well-oscillatable, thinner material such as PP.
  • FIG. 11 shows a further exemplary embodiment of a plastic hollow body 1 according to the invention which corresponds in its construction to the product variant shown in FIG. 8.
  • the first layer 10 is covered externally with a Abdeckvlies 2, which spans the thermoformed first layer 10 to form further cavities 70, which also have an acoustic effectiveness, resulting in further advantages in the acoustic behavior of the acoustically effective plastic height I stressess according to this embodiment ,
  • the cover fleece 2 is not in surface contact with the first layer 10, but stands only with peripheral regions of the first layer 10 and the raised regions formed by the partial compression of the first layer 10 and the acoustically effective layer 30 the first layer 10 in direct contact.
  • the fleece 2 is made of PET or PP and has a thickness of 0.75 millimeters. It has a basis weight of about 200 g / m2. It is circumferentially thermally welded to the first layer 10, wherein the web 2 is arranged in an additional process step on the plastic hollow body 1 and welded to the first layer 10, which follows the method shown in Figures 1 to 7.
  • FIG. 12 shows a further exemplary embodiment of a hollow plastic body 1 according to the invention, which again corresponds in its construction to the product variant shown in FIG. 8.
  • the first layer 10 is externally covered with a metal foil 3 made of aluminum or an aluminum foil and having a thickness of about 100 microns.
  • a metal foil 3 made of aluminum or an aluminum foil and having a thickness of about 100 microns.
  • the metal foil 3 introduced into the cavity of the molding tool is provided with a thermally activatable adhesive layer on its surface facing the first layer 10. This is thermally activated in the closed mold and leads to a permanent connection between metal foil 3 and first layer 10.
  • the metal foil 3 increases the thermal resistance of the plastic according to the invention height I body 1, so that it can also be used in areas with increased heat input, z. B. in the vicinity of the exhaust line of a motor vehicle with internal combustion engine.
  • no metal foil 3 is provided, which covers the entire surface of the first layer 10. Rather, the metal foil 3 covers only those portions of the first layer 10, in which an increased heat input in the intended use of the plastic height I stressess is to be expected. These subregions may be characterized, for example, in that they are spatially adjacent to the exhaust gas line of a motor vehicle.
  • a metal foil 3 can embrace a passage of a heat-radiating component, such as an exhaust gas conduit, through the plastic according to the invention, which is the height of the body.
  • the metal foil 3 is arranged on the inner surface of the first layer 10, or one of the surfaces of the second layer 20. Also, a plurality of metal foils 3 may be provided, the individual of the inner or outer surfaces of the first or cover second layer 10, 20.
  • FIG. 13 shows a further exemplary embodiment of a plastic hollow body 1 according to the invention which corresponds in its construction to the product variant shown in FIG. 7.
  • the acoustically effective layer 30 is composed of two partial layers 31 and 32.
  • the first sub-layer 31 has sound-absorbing properties
  • the second sub-layer 32 has sound-insulating properties.
  • the first sub-layer 31 is formed as a fleece made of PET or PP and has a thickness of 8 millimeters and a basis weight of 250 g / m2.
  • the second sub-layer 32 is formed as a needled PET or PP fiber mat and has a thickness of 1.5 millimeters and a basis weight of 800 g / m2.
  • the second sub-layer 32 adjoins the second layer 20 and, with its high basis weight, provides effective acoustic damping of the second layer 20.

Abstract

L'invention concerne un corps creux en matière plastique à effet acoustique comprenant un matériau composite constitué d'une première couche (10) gaufrée en forme de plaque ou de feuille, réalisée en une première matière plastique thermoplastique, d'une seconde couche (20) éventuellement gaufrée, en forme de plaque ou de feuille, réalisée en une deuxième matière plastique, et d'une couche (30) à effet acoustique, constituée d'un composite fibreux, disposée entre la première et la deuxième couche (10, 20). La couche (30) à effet acoustique est comprimée au moins par endroits en fonction du gaufrage de la première couche (10) et/ou de la deuxième couche (20). L'invention concerne en outre un procédé de fabrication avantageux pour des corps creux en matière plastique à effet acoustique.
PCT/EP2017/077105 2017-03-31 2017-10-24 Corps creux en matière plastique à effet acoustique et son procédé de fabrication WO2018177573A1 (fr)

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DE102020213546A1 (de) 2020-10-28 2022-04-28 Sedus Stoll Aktiengesellschaft Verfahren zur Herstellung eines Raumteilers aus Faserverbundmatten, Raumteilersystem sowie Tisch
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WO2021113172A1 (fr) * 2019-12-05 2021-06-10 Zephyros, Inc. Composites de garniture
EP4209339A4 (fr) * 2020-09-23 2024-03-06 Huawei Tech Co Ltd Boîtier, ensemble de vibrations et véhicule
DE102020213546A1 (de) 2020-10-28 2022-04-28 Sedus Stoll Aktiengesellschaft Verfahren zur Herstellung eines Raumteilers aus Faserverbundmatten, Raumteilersystem sowie Tisch

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