EP3529027A1 - Method for producing a plastic body suitable as a decorative element - Google Patents

Method for producing a plastic body suitable as a decorative element

Info

Publication number
EP3529027A1
EP3529027A1 EP17791981.8A EP17791981A EP3529027A1 EP 3529027 A1 EP3529027 A1 EP 3529027A1 EP 17791981 A EP17791981 A EP 17791981A EP 3529027 A1 EP3529027 A1 EP 3529027A1
Authority
EP
European Patent Office
Prior art keywords
transparent
characterized
method according
step
plastic body
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.)
Pending
Application number
EP17791981.8A
Other languages
German (de)
French (fr)
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
Priority to EP16194440 priority Critical
Application filed by Covestro Deutschland AG filed Critical Covestro Deutschland AG
Priority to PCT/EP2017/076163 priority patent/WO2018073111A1/en
Publication of EP3529027A1 publication Critical patent/EP3529027A1/en
Application status is Pending legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0003Injection 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection 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
    • B29C45/14336Coating a portion of the article, e.g. the edge of the article
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection 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
    • B29C45/14336Coating a portion of the article, e.g. the edge of the article
    • B29C45/14377Coating a portion of the article, e.g. the edge of the article using an additional insert, e.g. a fastening element
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16Making multilayered or multicoloured articles
    • B29C45/1671Making multilayered or multicoloured articles with an insert
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection 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
    • B29C45/14467Joining articles or parts of a single article
    • B29C2045/14532Joining articles or parts of a single article injecting between two sheets

Abstract

The present invention relates to a method for producing a plastic body (1), comprising the steps of: a) providing a possibly deformable basic element (2); b) overmoulding or undermoulding the basic element (2) with a transparent or translucent thermoplastic to create a first layer (4) of a transparent or translucent thermoplastic in order to form a preform; c) possibly applying a background film (3) to the first layer (4), formed by the thermoplastic, of the preform; d) encapsulating the preform obtained in step b) or the modified preform obtained in step c) in a transparent or translucent thermoplastic to create a second layer (6) of a transparent or translucent thermoplastic. The invention also relates to a plastic body (1) that can be obtained by such a method and the use thereof as a decorative element, in the automobile industry or in a lighting system.

Description

A process for producing a plastic body which is suitable as a decorative element

The present invention relates to a method for producing a plastic body which includes a decorated or printed base member. Furthermore, the invention relates to the plastic body obtained by the manufacturing method and use of this plastic body as a decorative element.

Plastic body comprising a partially printed sheet are included in the prior art. Thus AI 2007141353 describes the US a process for the manufacture of decorative plastic compositions comprising a decorative layer, a backing layer and a clear outer layer. In this case, an injection molding method can be used for the preparation.

To visually appealing plastic body to obtain is often a desirable appearance, which can appear three-dimensionally by an optical effect, the decorative element or the pressure on the film. For example, CN 101954703 Al describes an injection molding method for producing a plastic body. In the method, while a first injection molding step to the decorative film is carried out with a transparent injection molding material to obtain a first body. The body so obtained has a transparent injection molding material on one side of the decorative sheet. After resting the body thus obtained the latter is provided in a second injection molding step on the side on which no material is injection molded with a non-transparent injection molding material. The decoration of the plastic body obtained reaches a three-dimensional effect by the double injection molding.

An object of the present invention is a plastic body with low shrinkage, comprising a three-dimensional effect of the decorated or printed base member, and a process for its production. A further object of the present invention is the provision of a plastic body having a three-dimensional effect of the decorated or printed base member having improved optical imaging characteristics and a low internal voltage. The object is achieved by a process for producing a plastic body comprising the steps of: a) providing an optionally deformable base element; b) over- or under-spraying of the base member having a transparent or translucent thermoplastics to produce a first layer of a transparent or translucent thermoplastics to form a preform; c) optionally applying a film to the background formed by the thermoplastic first layer of the preform;

Insert molding the preform obtained in step b) or in step c) the obtained modified preform having a transparent or translucent thermoplastics to produce a second layer of a transparent or translucent thermoplastics.

The term "substantially" is defined for the present invention so that it is 95%, preferably 98%, more preferably 99%, even more preferably 99.9% of the respective property or of each feature to which it constitutes relates if it is not explicitly defined differently. the invention further relates to a plastic body which is obtainable by the inventive method. in this, the base element is preferably substantially in the middle of the plastic body.

The invention further relates to the use of such a plastic body as a decorative element, particularly in the automotive industry, for example as a gear selection lever aperture or warning flasher switch. The plastic body of the invention can also be used in an illumination system as a lens having at least one light-emitting diode as a light source.

The optionally deformable base member know, at least in a partial region of a decoration or printing, which is also referred to as a decoration. In the inventive method, the base member may be a plastic film, therefore, which is partially printed. Under decorated base member, a decorative element is meant which is of a piece, for example made of a plastic mold, but no cuboids or cubes. In a preferred embodiment, the base member is a film which is at least partially decorated with a decoration or printed, in particular printed. When decorating, especially the printing, it can, for example, a logo, a Vehicles- or vehicle class name, acting a text or a decorative pattern.

The basic element, in particular when this to be a film is deformed in preference to the excess or back molding. This can achieve a higher position accuracy and / or symbol tolerance of the base member in the final plastic body. This can be achieved for example by HPF (high pressure forming, high pressure forming). For example, EP 2197656 Bl, such a method for producing a deep-drawn film part made of thermoplastic material. In the method, a piece of film is fitted in a defined arrangement to a frame, so the frame resting on the piece of film is introduced into a heating zone, heated there and at least the section of film to a predetermined temperature. The thus heated film piece is then introduced quickly into a deforming zone and there subjected immediately and directly with a fluid pressure medium and shaped into the desired deep-drawn part.

After providing the basic element to obtain it in the next step to a preform on one side over or back-molded.

Wherever the base member is a film so it can be additionally deformed thereby, that has at least in a partial area of ​​the decoration, in particular printing, a greater three-dimensional deformation.

The targeted deformation before or during the over- or back injection of only partial regions of the base member effects can be achieved, such as the moire effect in the superposition of two different structures, namely the decoration and the deformation occurs. Also can be done as the simulation of patterns or inlays. In the three-dimensional deformation is preferably at an elevation of the portion of the base member, in particular the portion of the decoration, especially lettering.

In this case, the deformation is carried out by over- or insert molding of the base member having a transparent or translucent thermoplastics in an optional molding injection mold. In this case, a layer is obtained whose surface which is remote from the basic element is substantially flat or smooth. With the thus obtained transparent or translucent layer a depth effect is obtained, which still improves the three-dimensional effect of the base member. Also thereby, the stability in the preform, as compared to the base member, is improved.

Under a transparent thermoplastics such is understood to be in the range of 400 nm to 800 nm has 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%, as determined according to ASTM Dl at a layer thickness of 1 mm, preferably at most 5%, having 003. Under a transluszenzen thermoplastics such is understood that in the range of 400 nm to 800 nm has a transmission of at least 5%, determined according to ISO 13468 at a thickness of 1 mm, preferably at least 10%, and in a haze of more than 10% as determined by ASTM D1003 at a thickness of 1 mm, preferably at least 15%.

For example, the AI ​​DE102007011338 discloses a method and a device for producing thick-walled optical components made of plastic by a multistage Spritzgus sprozess in which takes place a cup-shaped construction of the component from the inside to the outside in an at least two-stage process. The result is a visually homogeneous component with a much higher precision than is achievable in conventional injection molding or injection compression molding method.

In a preferred embodiment, the base member is a plastic film which 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 before step b). By using a transparent partially printed resin sheet the impression of the imprint is amplified as a free-floating three-dimensional element. In the present invention, both a single-layer film and a multilayered film, for example is understood to be a film obtained by co-extrusion with plastic film.

Materials which for the basic element and in particular the plastic film be used are preferably thermoplastics such as polycarbonates, polyacrylates or poly (meth) acrylates, polyamides, polysulfones, polyesters, thermoplastic polyurethanes, and polystyrenes, copolymers, and mixtures thereof. Particularly preferred thermoplastics are, for example, polyacrylates, poly (meth) acrylates (such as PMMA; example, commercially available as Plexiglas® Röhm), ​​cycloolefin copolymer (COC, eg commercially available as Topas® from Ticona or Zenoex® by Nippon Zeon or Apel® by Japan Synthetic Rubber ), polysulfones (such as commercially available as Ultrason @ by BASF or Ude® from Solvay), polyesters, for example Pethylenterephthalat (PET) or Pethylennaphthalat, polycarbonate (PC), polycarbonate / polyester blends, such as PC / PET, polycarbonate Polycyclohexylmethanol cyclohexanedicarboxylate ( PCCD, for example, commercially available as Xylecs® GE), polycarbonate, polybutylene terephthalate (PBT) and mixtures thereof. Preferably, the transparent or translucent thermoplastic material of step b) is selected from polycarbonates, polyacrylates, poly (meth) acrylates, including polyamides, polysulfones, polyesters, thermoplastic polyurethanes, polystyrenes, copolymers thereof and mixtures thereof. In a particularly advantageous and preferred embodiment of the present invention, the thermoplastic polycarbonate or copolycarbonate comprising.

Suitable polycarbonates according to the invention are all known polycarbonates. These are homopolymers, copolycarbonates and thermoplastic polyester. These preferably have average molecular weights Mw from 18,000 to 40,000 g / mol, preferably 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 production of the polycarbonates preferably takes place by the interfacial polycondensation process or the melt transesterification process, which have often been described in the literature. With regard to the boundary process is exemplified by reference quick to H., Chemistry and Physics of Polycarbonates, Polymer Reviews, Volume 9, Interscience Publishers, New York 1964 page 33 et seq .. On Polymer Reviews, Vol. 10, "condensation polymers of Interfacial and solution methods ", Paul W. Morgan, Interscience Publishers, New York 1965, chap. VIII, page 325. On Dr. U. Grigo, Dr. K. Kircher and Dr. PR Müller "Polycarbonate" [polycarbonate] in Becker / Braun, Kunststoff-Handbuch [Polymer Handbook], Volume 3/1, polycarbonates, polyacetals, polyesters, Celluloseester [polycarbonates, polyacetals, polyesters, Celluloseester], Carl Hanser Verlag, Munich, Vienna , 1992, pp 118-145, and EP 0517044 Al. The melt transesterification process is, for example, in the Encyclopedia of Polymer Science, Volume 10 (1969), Chemistry and Physics of Polycarbonates, Polymer Reviews, H. Schnell, Volume 9, John Wiley and Sons, Inc. (1964) and in patents DE 10 31 512 Bl and US Pat. Nos. 6,228,973. The polycarbonates can be obtained in the melt transesterification process by reaction of bisphenol compounds with carbonic acid compounds, particularly 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 l, l-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane. Other bisphenol compounds that may be used for the polycarbonate synthesis are disclosed inter alia in WO 2008/037364 Al, EP 1582549 Al, WO 2002/026862 Al and WO 2005/113639 Al.

The polycarbonates can be linear or branched. It is also possible to use mixtures of branched and unbranched polycarbonates.

Suitable branching agents for polycarbonates are known from the literature and described, for example in the patents U.S. Pat. Nos. 4185009 Bl, DE 25 00 092 Al, DE 42 40 313 Al, DE 19943642 Al, US Pat. Nos. 5,367,044 Bl and in literature cited therein. Furthermore, the polycarbonates may also be branched can be intrinsic, in which case no branching agent in the course of polycarbonate preparation is added. An example of intrinsic branching is the so-called Fries structures, as disclosed in EP 1506249 Al for the melt polycarbonates.

Moreover, it is possible to use chain terminators in the polycarbonate production. The chain terminators are preferably phenols, such as phenol, alkylphenols such as cresol and 4-tert.-butylphenol, chlorophenol, bromophenol, cumylphenol or mixtures thereof.

In alternative embodiments, it may be at the base member and a textile, metal foil, a veneer, or act a laminate. In a preferred embodiment the basic element at least 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% is decorated or printed, based on the total surface the primitive. The embodiments are in ascending order, preferably with increasing percentage proportion. For example, 40% are more preferred than 30% and 30% are more preferred than 20%. In alternative embodiments maximum decorating or Bedruckungsgrade in addition to one of the abovementioned percentage Mindestbedruckungsgrade present, which are in particular 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% or 10%. These are preferably in descending order. In particularly preferred embodiments, the base element is printed. In a further preferred embodiment the base member is decorated or printed on both sides.

In a preferred embodiment, the base member is substantially in the middle of the plastic body. The determination of the position takes place by the fact that the side with the greatest surface area is defined as the underside of the plastic body and orthogonally to a cross-section takes place. The location of the element with respect to the bottom and top of the plastic body is determined. Substantially in the middle means that the distances of the base member to the respective side, a difference of 20%, preferably 10%, more preferably 5%, most preferably from 1% does not exceed. After step b) of the over- or under-spraying of the base member having a transparent or translucent thermoplastics preform is obtained. In a preferred embodiment, a background sheet is applied to the layer formed by the thermoplastic material of the preform (step c)). The application of the optional background foil is preferably carried out during the step b) by the background film is fixed in the tool, or by anti-static charging. By the background foil, another aesthetic effect can be achieved. For example, the background film can be printed with a motif or pattern. In particular, it can at this design or pattern around metallic, brushed or carbon structures Diffusermaterialien or Lichtauskoppelmaterialien act. May be obtained by a further optical effect, among others, the decoration of the inserted film is highlighted. This gives the impression of a floating number, for example, are amplified as decoration if it is against a pattern and or back, is preferred diffusely illuminated. In a preferred embodiment, the background foil is not transparent. This embodiment is also referred to as a preform. The background sheet can be constructed from the same range of materials as the basic element, but independent of it. That is, the materials may be the same or different.

In the inventive plastic bodies, in principle all films used for this purpose may be constructed from the same polymer material, the films may differ in the additive or treatment. Thus, the upper cover sheet may be a film made of polycarbonate, for example, which is equipped with an additional hardcoat coating. The first of the inner film may be a polycarbonate film, for example, also be provided with a screen printing. The underlying second inner film may also be constructed of polycarbonate and colored gray or slightly diffuse designed, and the bottom sheet - also made of polycarbonate - can be provided with a screen printing in order to uncouple the laterally input light to the front.

Furthermore, the method comprises the step of fully insert molding the preform (step d)). The method of the insert molding is known in the art. The method of the insert molding is described for example in the publications WO 2012/069590 Al, EP 2402140 Al and DE 102007011338 Al. The preform is in this case extrusion-coated with a further layer of a transparent or translucent thermoplastics, so that this further layer of transparent or translucent thermoplastics seamlessly increased by the surface of the preform.

The transparent or translucent thermoplastic used in step b) and d), and in preferred embodiments of the materials as for the base element consist described above. The respective thermoplastics may independently contain additives such as dyes and pigments. This can produce an optical effect.

In a preferred embodiment, the base member and the transparent or translucent thermoplastic from the same material, preferably a polycarbonate.

In a preferred embodiment, the plastic body of the invention may include a second background film. this film is preferably attached on the side which is located later by the installed state of the plastic body according to the invention at the time of end on the side facing away from the viewer.

The surface of the plastic body can be painted with a Hardcoatbeschichtung. In a further preferred embodiment, a cover sheet is optionally applied to the plastic body. this cover sheet is preferably placed on the side which is located later by the installed state of the plastic body according to the invention at the time of end on the side facing the observer. In a more preferred embodiment, the cover film is a hard coat film, which is referred to as coated hardcoat film.

The cover film is preferably as described above for the basic element, which may be coated with a coating agent made of thermoplastics. Preferred embodiments, particularly of the coating agent (coating / coatings) and manufacturing method for the coversheet are described in US2016152863 or WO2014206958 AI AI.

More particularly, the invention relates to the following embodiments:

In a first embodiment the invention relates to a process for producing a plastic body (1), comprising the steps of: a) providing an optionally deformable base element (2);

b) over- or under-spraying of the base member (2) with a transparent or translucent thermoplastics for forming a first layer (4) of a transparent or translucent thermoplastics to form a preform; c) optionally attaching a back sheet (3) on the formed by the first thermoplastic layer (4) of the preform;

d) molding the preform obtained in step b) or in step c) the obtained modified preform having a transparent or translucent thermoplastics for forming a second layer (6) of a transparent or translucent thermoplastics.

According to a second embodiment, 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.

According to a third embodiment, the invention relates to a method according to the 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, copolymers thereof and mixtures thereof, preferably polycarbonate.

In a fourth embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that the background sheet (3) is preferably applied simultaneously with step b). In a fifth embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that the material of the rear base sheet (3) is selected from polycarbonates, polyacrylates, poly (meth) acrylates, polyamides, polysulfones, polyesters, thermoplastic polyurethanes, polystyrenes, copolymers thereof and mixtures thereof, preferably polycarbonate.

In a sixth embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that the transparent or translucent thermoplastic material of the second layer (6) from step d) is selected from polycarbonates, polyacrylates, poly (meth) acrylates, polysulfones, polyesters thermoplastic polyurethanes, polystyrenes, copolymers thereof and mixtures thereof, preferably polycarbonate.

According to a seventh embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that in step d) or following a back-molding a cover sheet (5), preferably a hardcoat coated cover film is carried out.

In an eighth embodiment, 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, copolymers and blends thereof thereof, preferably polycarbonate.

In a ninth embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that takes place in step d) or following an overmoulding of another background sheet (7).

In a tenth embodiment, the invention relates to a method according to embodiment 9, characterized in that the background sheet (7) is a film for increasing brightness.

In an eleventh embodiment, the invention relates to a plastic body (1) obtainable by a method according to any one of embodiments 1 to 10. According to a twelfth embodiment of the invention relates to a plastics body according to Embodiment 11, characterized in that the base element (2) is substantially is in the middle of the plastic body (1).

In a thirteenth embodiment, the invention relates to the use of a plastic body according to any one of embodiments 11 or 12 as decorative element.

In a thirteenth embodiment, the invention relates to the use according to embodiment 13 in the automobile industry, especially as a gear selection lever aperture or warning flasher switch.

In a thirteenth embodiment, the invention relates to the use according to embodiment 13 or 14 in an illumination system as a lens having at least one light-emitting diode as a light source.

The present invention is explained below with reference to FIGS. 1 and an exemplary embodiment. it shows

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 present in the plastic body 1 according to the invention. The plastic body 1 consists of a base member 2, here in the form of a partially printed plastic film, a first layer 4 of a transparent or translucent thermoplastic over- or under-injection has been, a back sheet 3, a second layer 6 made of a transparent or translucent thermoplastics has been molded, a back sheet 7 and a cover film. 5

example

The base member 2 is made of a polycarbonate film Makrofol® DE1-4 with a total thickness of 250μιη and a surface combination high-gloss / matt. The base film 2 is decorated using a color system IMD Noriphan HTR N from. Pröll KG using screen printing process and then to a sheet size of 210mm x 240mm sporadically. The already designed decorative foil is then placed in a HPF unit from. Niebling GmbH fluidem means of pressure medium in a three-dimensional shape, so that the decorative element is assigned a defined position. The mold design and decoration of the individual basic elements are different to each other and are determined via the respective positioning of the film 2, 3, 5, 7 in the spray body.

For further production of the plastic body 1 is a 2-component injection molding machine and a two-layer lens tool is used. The first mold cavity forming the negative shape of the contour of the core 4. In this case, the basic element 2 and 3 is inserted into the respective mold halves of the preform and antistatic or the shaping of the film inserts positioned in the mold. The mold temperature here is 90 ° C. The preform is charged centrally via a laterally mounted tunnel gate with plastic melt and back-molded or over-molded, the respective film insert. The melt temperature of the polycarbonate Makroion® LED2245 is 280 ° C. In further step, the sheet inserts can also be inserted 5 and 7 in the second mold cavity. Insert 5 consists of a foil Hardcoatbeschichteten Makrofol® HF278 and later forms the visible side of the component. The insert 7 consists of a diffuser film Makrofol® LM228 and forms the component side remote from the viewer. After cooling of the preform that is taken out of the first cavity, transported to the further cavity and held by two lateral holding tabs precisely positioned in the cavity. As with the production of the preform, a transparent polycarbonate is also used in the subsequent power stroke. In the further process step molten plastic is introduced via a tunnel gate again. The film inserts 5 and 7 are respectively back-molded or over-molded and injection-molded around the preform symmetrically. 6

LIST OF REFERENCE NUMBERS

(1) Plastic body

(2) basic element

(3) background foil

(4) First layer of a transparent or translucent thermoplastics

(5) cover sheet

(6) Second layer of a transparent or translucent thermoplastics

(7) background foil

Claims

claims
1. A process for producing a plastic body (1), comprising the steps of: a) providing an optionally deformable base element (2);
b) over- or under-spraying of the base member (2) with a transparent or translucent thermoplastics for forming a first layer (4) of a transparent or translucent thermoplastics to form a preform; c) optionally attaching a back sheet (3) on the formed by the first thermoplastic layer (4) of the preform;
d) molding the preform obtained in step b) or in step c) the obtained modified preform having a transparent or translucent thermoplastics for forming a second layer (6) of a transparent or translucent thermoplastics.
2. The method according to claim 1, characterized in that the base element (2) is a plastic film which is partially printed.
3. The method according to claim 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, copolymers thereof and mixtures thereof, preferably polycarbonate.
4. The method according to any one of the preceding claims, characterized in that the background sheet (3) is preferably applied simultaneously with step b).
5. The method according to any one of the preceding claims, characterized in that the material of the rear base sheet (3) is selected from polycarbonates, polyacrylates, poly (meth) acrylates, polyamides, polysulfones, polyesters, thermoplastic polyurethanes, polystyrenes, copolymers thereof and mixtures thereof, preferably polycarbonate.
6. The method according to any one of the preceding claims, characterized in that the transparent or translucent thermoplastic material of the second layer (6) from step d) is selected from polycarbonates, polyacrylates, poly (meth) acrylates, polysulfones, polyesters, thermoplastic polyurethanes, polystyrenes, copolymers thereof and mixtures thereof, preferably polycarbonate.
7. The method according to any one of the preceding claims, characterized in that in step d) or following a back-molding a cover sheet (5) is preferably carried out a hardcoat coated cover sheet.
8. The method according to claim 7, characterized in that the material of the cover sheet (5) is selected from polycarbonates, polyacrylates, poly (meth) acrylates, polysulfones, polyesters, thermoplastic polyurethanes, polystyrenes, copolymers thereof and mixtures thereof, preferably polycarbonate.
9. The method according to any one of the preceding claims, characterized in that takes place in step d) or following an overmoulding of another background sheet (7).
10. The method according to claim 9, characterized in that the background sheet (7) is a film for increasing brightness.
11. plastics body (1) obtainable by a method according to any one of claims 1 to 10 degrees.
12. Plastic body according to claim 11, characterized in that the base element (2) substantially in the middle of the plastic body (1).
13. Use of a plastic body according to any one of claims 11 or 12 as decorative element.
14. Use according to claim 13 in the automotive industry, especially as a gear selection lever aperture or warning flasher switch.
15. Use according to claim 13 or 14 in an illumination system as a lens having at least one light-emitting diode as a light source.
EP17791981.8A 2016-10-18 2017-10-13 Method for producing a plastic body suitable as a decorative element Pending EP3529027A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16194440 2016-10-18
PCT/EP2017/076163 WO2018073111A1 (en) 2016-10-18 2017-10-13 Method for producing a plastic body suitable as a decorative element

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