WO2018073111A1 - Procédé pour la fabrication d'un corps en matière synthétique qui convient comme élément décoratif - Google Patents

Procédé pour la fabrication d'un corps en matière synthétique qui convient comme élément décoratif Download PDF

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Publication number
WO2018073111A1
WO2018073111A1 PCT/EP2017/076163 EP2017076163W WO2018073111A1 WO 2018073111 A1 WO2018073111 A1 WO 2018073111A1 EP 2017076163 W EP2017076163 W EP 2017076163W WO 2018073111 A1 WO2018073111 A1 WO 2018073111A1
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WO
WIPO (PCT)
Prior art keywords
film
transparent
thermoplastic
plastic body
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.)
Ceased
Application number
PCT/EP2017/076163
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German (de)
English (en)
Inventor
Konstantin LEONHARDT
Roland KÜNZEL
Michael Roppel
Sebastian Bendig
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.)
Covestro Deutschland AG
Original Assignee
Covestro Deutschland 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
Application filed by Covestro Deutschland AG filed Critical Covestro Deutschland AG
Priority to EP17791981.8A priority Critical patent/EP3529027A1/fr
Publication of WO2018073111A1 publication Critical patent/WO2018073111A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0003—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of successively moulded portions rigidly joined to each other
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B29C45/14377—Coating a portion of the article, e.g. the edge of the article using an additional insert, e.g. a fastening element
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1671—Making multilayered or multicoloured articles with an insert
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14467—Joining articles or parts of a single article
    • B29C2045/14532—Joining articles or parts of a single article injecting between two sheets

Definitions

  • the present invention relates to a method of manufacturing a plastic body containing a decorated or printed base. Furthermore, the invention relates to the plastic body obtained by the manufacturing method and the use of this plastic body as a decorative element.
  • CN 101954703 AI describes an injection molding process for producing a plastic body.
  • a first injection molding step is carried out on the decorative film with a transparent injection molding material in order to obtain a first body.
  • the body thus obtained has a transparent injection-molding material on one side of the decorative film. After resting the body thus obtained, it is provided in a second injection molding step on the side on which there is no injection molding material, with a non-transparent injection-molded material.
  • the decoration of the obtained plastic body achieves a three-dimensional effect by the double injection molding.
  • the object is achieved by a method for producing a plastic body comprising the steps: a) providing an optionally deformable primitive; b) over or under molding the base member with a transparent or translucent thermoplastic to produce a first layer of transparent or translucent thermoplastic to form a preform; c) optionally applying a background film to the first layer of the preform formed by the thermoplastic;
  • the term "substantially” is defined for the present invention to be 95%, preferably 98%, more preferably 99%, even more preferably 99.9% of the particular property or characteristic to which it refers if
  • the invention furthermore relates to a plastic body obtainable by the method according to the invention, in which the base element is preferably located substantially in the center of the plastic body.
  • the invention further relates to the use of such a plastic body as a decorative element, in particular in the automotive industry, for example as a gear selector lever or warning flasher.
  • the plastic body according to the invention can also be used in a lighting system as a lens with at least one light-emitting diode as the light source.
  • the optionally deformable basic element has at least in one sub-area an ornament or print on, which is also referred to below as a decoration.
  • the base element can thus be a plastic film which is partially printed.
  • An ornamented base element is also understood to mean a decorative element which is of a cast, for example a shape made of plastic, but not a cuboid or cube.
  • the base element is a film which is at least partially decorated or printed with a decoration, in particular printed.
  • the decoration in particular the printing, it can, for example, to a company emblem, a vehicle type or vehicle class name, a text or a purely decorative pattern.
  • the base element in particular if it is a film, is preferably deformed before overmolding or backmolding.
  • HPF High Pressure Forming
  • EP 2 197 656 B1 describes such a process for producing a thermoformed film part made of thermoplastic material.
  • a piece of film is mounted in a defined arrangement on a frame, which is placed so as to rest on the frame piece of film in a heating zone, and there heats at least the film portion to a predetermined temperature.
  • the thus heated piece of film is then quickly introduced into a deformation zone where it is directly and directly charged with a fluid pressure medium and deformed to the desired deep-drawn part.
  • the base element is a foil, it can additionally be deformed in that case, at least in a partial region of the decoration, in particular the printing, has a stronger three-dimensional deformation.
  • the three-dimensional deformation is preferably an elevation of the subarea of the basic element, in particular of the subarea of the decoration, in particular of the printing.
  • the deformation takes place by overmolding or back-molding of the base element with a transparent or translucent thermoplastic in an optionally shaping injection mold.
  • a layer is obtained whose surface, which faces away from the base element, is essentially flat or smooth.
  • the transparent or translucent layer thus obtained achieves a depth effect which dimensional effect of the primitive still improved. Also, this improves the stability of the preform in comparison to the base element.
  • a transparent thermoplastic is understood to be one which, in the range from 400 nm to 800 nm, determines a transmission of at least 75%, determined according to ISO 13468 at a thickness of 1 mm, preferably at least 85%, and a haze of at most 10% according to ASTM Dl 003 at a layer thickness of 1 mm, preferably of at most 5%.
  • a translucent thermoplastic is understood to mean one which has a transmission of at least 5%, determined to ISO 13468 at a thickness of 1 mm, preferably at least 10%, in the range from 400 nm to 800 nm, and a haze of more than 10%. , determined according to ASTM D1003 at a layer thickness of 1 mm, preferably of at least 15%.
  • DE102007011338 A1 describes a method and an apparatus for producing thick-walled, optical components made of plastic by a multi-stage injection molding process in which a shell-shaped construction of the component takes place from the inside to the outside in an at least two-stage process.
  • the result is an optically homogeneous component with significantly higher precision than can be achieved in the conventional injection molding or injection compression molding process.
  • the base member is a plastic film which is at least partially decorated or printed, in a more preferred embodiment this plastic film is transparent, in the most preferred embodiment the plastic film is additionally deformed prior to step b).
  • plastic film includes both a monolayer film and a multilayer film, e.g. a film obtained by co-extrusion understood.
  • Materials used for the base member, and especially the plastic film are preferably thermoplastics such as polycarbonates, polyacrylates or poly (meth) acrylates, polyamides, polysulfones, polyesters, thermoplastic polyurethanes and polystyrenes, copolymers and blends thereof.
  • thermoplastics such as polycarbonates, polyacrylates or poly (meth) acrylates, polyamides, polysulfones, polyesters, thermoplastic polyurethanes and polystyrenes, copolymers and blends thereof.
  • thermoplastics are, for example, polyacrylates, poly (meth) acrylates (eg PMMA, eg commercially available as Plexiglas® Röhm), cycloolefin copolymers (COC, eg commercially available as Topas® from Ticona or Zenoex® from Nippon Zeon or Apel® from Japan Synthetic Rubber), polysulfones (eg commercially available as Ultrason® from BASF or Ude® from Solvay), polyesters, for example polyethylene terephthalate (PET) or polyethylene naphthalate, polycarbonate (PC ), Polycarbonate / polyester blends such as PC / PET, polycarbonate, polycyclohexylmethanol cyclohexanedicarboxylate (PCCD, eg, commercially available as Xylecs® from GE), polycarbonate, polybutylene terephthalate (PBT), and blends thereof.
  • PMMA poly (meth) acrylates
  • COC
  • the transparent or translucent thermoplastic from step b) is selected from polycarbonates, polyacrylates, poly (meth) acrylates, polyamides, polysulfones, polyesters, thermoplastic polyurethanes, polystyrenes, their copolymers and mixtures thereof.
  • the thermoplastic comprises polycarbonate or copolycarbonate.
  • Suitable polycarbonates according to the invention are all known polycarbonates. These are homopolymers, copolycarbonates and thermoplastic polyestercarbonates. These preferably have average molecular weights Mw of from 18,000 to 40,000 g / mol, preferably from 26,000 to 36,000 g / mol and in particular from 28,000 to 35,000 g / mol, determined by measuring the relative solution viscosity in dichloromethane or in mixtures of equal amounts by weight of phenol / o-dichlorobenzene , calibrated by light scattering.
  • the preparation of the polycarbonates is preferably carried out by the interfacial process or the melt transesterification process, which has often been described in the literature.
  • interfacial methods reference is made to H. Schnell, Chemistry and Physics of Polycarbonates, Polymer Reviews, Vol. 9, Interscience Publishers, New York 1964, page 33 et seq.
  • the polycarbonates can be obtained in the melt transesterification process by reactions of bisphenol compounds with carbonic acid compounds, in particular phosgene or diphenyl carbonate or dimethyl carbonate. Particular preference is given here to the homopolycarbonates based on bisphenol A and copolycarbonates based on the monomers bisphenol A and 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane. Further bisphenol compounds which can be used for the polycarbonate synthesis are disclosed inter alia in WO 2008/037364 Al, EP 1 582 549 A1, WO 2002/026862 Al and WO 2005/113639 Al.
  • the polycarbonates may be linear or branched. It is also possible to use mixtures of branched and un-branched polycarbonates.
  • Suitable branching agents for polycarbonates are known and described in the literature, for example in the patents US Pat. No. 4185009 Bl, DE 25 00 092 AI, DE 42 40 313 AI, DE 19 943 642 AI, US Pat. No. 5367044 Bl and in literature cited therein.
  • the polycarbonates may also be intrinsically branched, in which case no branching agent is added in the course of polycarbonate production.
  • An example of intrinsic branching is that of the so-called frieze structures, as disclosed in EP 1 506 249 A1 for the enamel polycarbonates.
  • chain terminators are preferably phenols such as phenol, alkylphenols such as cresol and 4-tert-butylphenol, chlorophenol, bromophenol, cumylphenol or mixtures thereof.
  • the base member may also be a textile, a metal foil, a veneer, or a laminate.
  • the base element is decorated or printed at least 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100%, based on the total surface area of the primitive.
  • the embodiments are in ascending order, with increasing percentage preferred. For example, 40% is more preferable than 30% and 30% is more preferable than 20%.
  • there are maximum decorating or printing levels which are in particular 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% or 10%. These are preferred in descending order.
  • the basic element is printed.
  • the basic element is decorated or printed on both sides.
  • the base member is located substantially in the center of the plastic body.
  • the position is determined by the fact that the side with the largest surface is defined as the bottom of the plastic body and orthogonal to a cross-section.
  • the position of the base element with respect to the bottom and top of the plastic body is determined.
  • Substantially in the middle means that the distances of the primitive to the respective side does not exceed a difference of 20%, preferably 10%, more preferably 5%, most preferably 1%.
  • the background foil may be printed with a motif or pattern.
  • this motif or pattern may be metallic, brushed or carbon structures, diffuser materials or light-extraction materials.
  • another optical effect can be obtained, i.a. the decoration of the inserted foil is especially emphasized.
  • the background film is not transparent. This embodiment is also referred to below as a preform.
  • the background film may be constructed from the same selection of materials as the primitive, but independently of it. That is, the materials may be the same or different.
  • the films used for this purpose can be constructed from the same polymer material, it being possible for the films to differ in the additive or after-treatment.
  • the upper cover sheet may be a sheet of polycarbonate, which is equipped with an additional hardcoat coating.
  • the first of the inner foils may, for example, also be a polycarbonate foil provided with screen printing.
  • the underlying second inner foil can also be constructed of polycarbonate and colored gray or slightly diffused, and the lower film - also made of polycarbonate - can be provided with a screen print to decouple the side fed light to the front can.
  • the method comprises the step of completely overmolding the preform (step d)).
  • the process of extrusion molding is known to the person skilled in the art. The method of extrusion molding is described for example in the publications WO 2012/069590 AI, EP 2402140 AI and DE 102007011338 AI.
  • the preform is in this case encapsulated with a further layer of a transparent or translucent thermoplastic, so that this further layer of transparent or translucent thermoplastics lays seamlessly around the surface of the preform.
  • the transparent or translucent thermoplastics used in steps b) and d) may, in preferred embodiments, consist of the materials as described for the primitive above.
  • the respective thermoplastics may independently contain additives such as dyes and pigments. This can produce an optical effect.
  • the base member and the transparent or translucent thermoplastics are made of the same material, preferably a polycarbonate.
  • the plastic body according to the invention may contain a second background film.
  • this film is mounted on the side which is later after installed state of the plastic body according to the invention in its end use on the side facing away from the viewer.
  • the surface of the plastic body can be painted with a Hardcoatbe Anlagenung.
  • a cover film is optionally applied to the plastic body.
  • this cover sheet is attached to the side which is later after installed state of the plastic body according to the invention in its end use on the side facing the viewer.
  • the coversheet is a hardcoat film, which is also referred to as a hardcoat-coated film.
  • the cover sheet is preferably made of thermoplastics as described above for the base member, which may be coated with a coating agent.
  • a coating agent coating / coating
  • production method for the cover film are described in US2016152863 AI and WO2014206958 AI.
  • the invention relates to a method for producing a plastic body (1), comprising the steps of: a) providing an optionally deformable basic element (2);
  • thermoplastic over or under molding the base member (2) with a transparent or translucent thermoplastic to produce a first layer (4) of a transparent or translucent thermoplastic to form a preform; c) optionally applying a background film (3) to the first layer (4) of the preform formed by the thermoplastic;
  • step d) overmoulding the preform obtained in step b) or the modified preform obtained in step c) with a transparent or translucent thermoplastic to produce a second layer (6) of a transparent or translucent thermoplastic.
  • the invention relates to a method according to embodiment 1, characterized in that the base element (2) is a plastic film which is partially printed.
  • the invention relates to a method according to embodiment 1 or 2, characterized in that the transparent or translucent thermoplastic of the first layer (4) of step b) is selected from polycarbonates, polyacrylates, poly (meth) acrylates, polyamides, Polysulfones, polyesters, thermoplastic polyurethanes, polystyrenes, their copolymers and mixtures thereof, preferably polycarbonate.
  • the transparent or translucent thermoplastic of the first layer (4) of step b) is selected from polycarbonates, polyacrylates, poly (meth) acrylates, polyamides, Polysulfones, polyesters, thermoplastic polyurethanes, polystyrenes, their copolymers and mixtures thereof, preferably polycarbonate.
  • the invention relates to a method according to one of the preceding embodiments, characterized in that the background film (3) is preferably applied at the same time as step b).
  • the invention relates to a method according to one of the preceding embodiments, characterized in that the material of the background film (3) is selected from polycarbonates, polyacrylates, poly (meth) acrylates, polyamides, polysulfones, polyesters, thermoplastic polyurethanes, polystyrenes, their copolymers and mixtures thereof, preferably polycarbonate.
  • the invention relates to a method according to one of the preceding embodiments, characterized in that the transparent or translucent thermoplastic of the second layer (6) from step d) is selected from polycarbonates, polyacrylates, poly (meth) acrylates, polysulfones, polyesters , thermoplastic polyurethanes, polystyrenes, their copolymers and mixtures thereof, preferably polycarbonate.
  • the invention relates to a method according to one of the preceding embodiments, characterized in that in step d) or subsequently a back-molding of a cover film (5), preferably a hardcoat-coated cover film, takes place.
  • the invention relates to a method according to embodiment 7, characterized in that the material of the cover sheet (5) is selected from polycarbonates, polyacrylates, poly (meth) acrylates, polysulfones, polyesters, thermoplastic polyurethanes, polystyrenes, their copolymers and mixtures thereof, preferably polycarbonate.
  • the invention relates to a method according to one of the preceding embodiments, characterized in that in step d) or subsequently an overspraying of a further background film (7) takes place.
  • the invention relates to a method according to embodiment 9, characterized in that the background film (7) is a film for increasing the brightness.
  • the invention relates to a plastic body (1) obtainable by a method according to one of the embodiments 1 to 10.
  • the invention relates to a plastic body according to embodiment 11, characterized in that the base element (2) is located substantially in the center of the plastic body (1).
  • the invention relates to the use of a plastic body according to one of the embodiments 11 or 12 as a decorative element.
  • the invention relates to the use according to embodiment 13 in the automotive industry, in particular as gear selector lever or warning flasher.
  • the invention relates to the use according to embodiment 13 or 14 in a lighting system as a lens having at least one light-emitting diode as the light source.
  • Fig. 1 is a schematic representation of a preferred embodiment of the plastic body.
  • Fig. 1 shows a side sectional view of a preferred embodiment of the plastic body 1 according to the present invention.
  • the plastic body 1 consists of a base element 2, in the present case in the form of a partially printed plastic film, a first layer 4 made of a transparent or translucent thermoplastic over or under injection, a background film 3, a second layer 6 of a transparent or translucent thermoplastic which has been overmoulded, a background film 7 and a cover film 5.
  • the basic element 2 consists of a polycarbonate film Makrofol® DE1-4 with a total thickness of 250 ⁇ m and a surface combination of high-gloss / matt.
  • the base film 2 is decorated using a IMD color system Noriphan HTR N Pröll KG by screen printing and then singulated to a sheet size of 210mm x 240mm.
  • the already decoratively designed film is then in a high-pressure forming system of Niebling GmbH by means of fluid pressure medium in a three-dimensional shape brought so that the decorative element receives a defined position.
  • the design and the decoration of the individual basic elements differ from each other and are determined by the respective positioning of the film 2, 3, 5, 7 in the injection molding.
  • the first tool cavity forms the negative shape of the core contour 4.
  • the base element 2 and 3 is inserted into the respective tool halves of the preform and positioned in the tool antistatic or on the shape of the film insert.
  • the mold temperature is 90 ° C.
  • the preform is centrally filled with plastic melt via a side-mounted tunnel gate and back-injected or over-injected with the respective foil inserts.
  • the melt temperature of the polycarbonate Makroion® LED2245 is 280 ° C.
  • the foil inserts 5 and 7 are also inserted into the second tool cavity.
  • Insert 5 consists of a hardcoat-coated film Makrofol® HF278 and forms the later visible side of the component.
  • the insert 7 consists of a diffuser film Makrofol® LM228 and forms the side facing away from the viewer side.
  • a transparent polycarbonate is also used in the subsequent work cycle.
  • plastic melt is introduced again via a tunnel gate.
  • the Folieninserts 5 and 7 are each injected behind or over-molded and the preform symmetric 6 overmolded.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un procédé pour la fabrication d'un corps (1) en matière synthétique, comprenant les étapes consistant à : a) utiliser un élément de base (2) le cas échéant déformable ; b) injecter une matière thermoplastique transparente ou translucide sur ou sous l'élément de base (2) pour produire une première couche (4) d'une matière thermoplastique transparente ou translucide, pour former une préforme ; c) le cas échéant, appliquer une feuille (3) d'arrière-plan sur la première couche (4) formée par la matière thermoplastique de la préforme ; d) injecter une matière thermoplastique transparente ou translucide autour de la préforme obtenue dans l'étape b) ou de la préforme modifiée obtenue dans l'étape c) pour former une deuxième couche (6) d'une matière thermoplastique transparente ou translucide. L'invention concerne en outre un corps (1) en matière synthétique, qui peut être obtenu par un tel procédé, ainsi que son utilisation comme élément décoratif, dans l'industrie automobile ou dans un système d'éclairage.
PCT/EP2017/076163 2016-10-18 2017-10-13 Procédé pour la fabrication d'un corps en matière synthétique qui convient comme élément décoratif Ceased WO2018073111A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17791981.8A EP3529027A1 (fr) 2016-10-18 2017-10-13 Procédé pour la fabrication d'un corps en matière synthétique qui convient comme élément décoratif

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16194440.0 2016-10-18
EP16194440 2016-10-18

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WO2018073111A1 true WO2018073111A1 (fr) 2018-04-26

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019121403A1 (de) * 2019-08-08 2021-02-11 Preh Gmbh Herstellungsverfahren für eine Kunststoffverbundabdeckung sowie zugehörige Kunststoffverbundabdeckung
US12151413B2 (en) 2019-08-08 2024-11-26 Preh Gmbh Plastic composite panel and associated production method

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