DE10020993A1 - Rear injection against plastic protector covering sheet in mold, causes protector melting and redistribution - Google Patents

Rear injection against plastic protector covering sheet in mold, causes protector melting and redistribution

Info

Publication number
DE10020993A1
DE10020993A1 DE2000120993 DE10020993A DE10020993A1 DE 10020993 A1 DE10020993 A1 DE 10020993A1 DE 2000120993 DE2000120993 DE 2000120993 DE 10020993 A DE10020993 A DE 10020993A DE 10020993 A1 DE10020993 A1 DE 10020993A1
Authority
DE
Germany
Prior art keywords
plastic
injection
film
protective
mold
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.)
Withdrawn
Application number
DE2000120993
Other languages
German (de)
Inventor
Michael Conze
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DE2000120993 priority Critical patent/DE10020993A1/en
Publication of DE10020993A1 publication Critical patent/DE10020993A1/en
Withdrawn legal-status Critical Current

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
    • B29C45/14Injection 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
    • B29C45/14836Preventing damage of inserts during injection, e.g. collapse of hollow inserts, breakage
    • 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
    • B29C45/14836Preventing damage of inserts during injection, e.g. collapse of hollow inserts, breakage
    • B29C2045/14844Layers protecting the insert from injected material

Abstract

The plastic protector (5) covers only a limited region of the plastic sheet, lying opposite the injection inlet (4). Plastic injection-molding mass is injected into the mold (2), melting the protector. Protector melting is sufficient that the entire rear (1a) of the sheet is covered by it, or it becomes completely distributed into the injection molding mass. Preferred features: The protector, a plastic sheet, is at least lightly bonded to the plastic sheet before rear-injection. In a variant method, the protector in the form of a suitable molding, is plugged into the mold inlet for plastic mass.

Description

The invention relates to a method for back-molding a plastic film or the like. In a back injection mold, the injection gate in particular re is directed substantially centrally towards the surface of the film, the Back by means of a plastic protective element, which during the Injection at least melts, before direct action of the here led injection molding plastic compound is protected. To the technical environment is in addition to DE 37 38 212 A1 in particular to DE 40 15 071 A1 referred.

While formerly on plastic injection molded parts, the surface of which is decorative should be designed, a suitable decorative film or the like. Laminated this decorative film has recently been incorporated into an injection mold placed and back-injected directly into it with the injection molding plastic compound. Usually, the so-called connection in the injection mold takes place in the Side or edge area of the decorative film, d. H. the sprue is on the side or in the film edge area, which is rather unfavorable in terms of process technology. A so-called central connection would be desirable, in which the sprue gate essentially central to the back surface of the decorative film (general Plastic film) is executed, but there is a risk that the Sprayed film, d. H. is damaged or that this so-called on the front or visible side of the film.  

A remedial measure for this problem is in the beginning called DE 37 38 212 A1 described, after which in the injection molding tool-inserted decorative film in the sprue or injection area surrounding smaller plastic cover sheet is placed, which from a Material is made that is more heat-resistant than that of the decorative film. For the application described in this document, namely a serving bare with decor, this technique may bring good results for others However, this technology is less suitable for use cases because the more heat-resistant cover film with its contour on the sight or front the side of the decorative film.

In this regard, it is more favorable that from the above-mentioned second DE 40 15 071 A1 known methods for producing so-called. laminated plastic molded parts. This is done in an injection mold inlaid lamination material (corresponds to the decorative film or plastic Film of the present invention) deposited with a release film and this The release film is back-injected with a thermoplastic. For the release film a plastic chosen, which with the thermoplastic a melting or little Most adhesive bond is made and use as the lamination ten plastic film is weldable. The thickness and rigidity of the Trennfo lie depending on the plasticizing temperature and the Ein injection pressure of the injection mold chosen so that during the Thermoplastic flow in the injection mold, the release film is sufficiently stiff remains so as not to shift and to push the thermo keep plastic flow away from the lamination material, and that after filling development of the injection mold the release film under the further heat and the pressure of the thermoplastic is still sufficient for welding or adhesive bond with the thermoplastic and the liner plastic film is melted.  

As can be seen from this description of the known prior art the requirements in particular for the choice of materials, basically, however, to the specification in general, regarding the Release film relatively high. On the one hand, this must be the one in particular intercept critical injection pressure, on the other hand, it should the Hin Do not negatively influence the spraying process as such.

Based on this state of the art, the present invention the task of opening a simpler procedure in this regard show which, although also with a separating film or the like, here plastic Protective element called, which works, however, in terms of its actual function is optimized without serious negative effects to have kungen on the back injection process.

The solution to this problem is characterized in that the waiter surface of the plastic protective element before inserting the injection molding Plastic compound in the injection mold based on the back of the film extends only over a limited area around the sprue gate, and that with the introduction of the injection molding plastic compound this protection element melts to the extent that its plastic material is essentially Chen over the entire surface of the back of the film or completely in the injection molding plastic mass distributed. Advantageous further developments are Content of the subclaims.

According to the invention, the so-called protective element extends before the injection the injection molding plastic mass and in the initial phase thereof in the we only relevant to the critical area of the film to be back-injected, to protect, d. H. only over a limited area of the sprue gate. With progressive filling of the injection molding tool However, the plastic protective element not only melts but also also on, so that its plastic material from which is in the spray  mold expanding plastic molding compound quasi (or in essential) over the entire surface of the decorative film (= the one behind splashing plastic film) is distributed. During this protective element consequently may be relatively thick at the start of the injection process section of the decorative film lying in the area of the injection gate shield, this protective element according to the invention towards the end of the one injection process relatively thin or even partially or completely dissolved and largely distributed over the entire surface of the decorative film. Even then, the plastic material of the protective element can be one Perform a protective function over the entire surface of the back of the film, the so-called protection request at the end of the injection process it is as at the beginning of the injection process.

While at the beginning of the injection process from the protective element quasi a local pressure peak has to be absorbed, with others Filling the injection mold due to the essentially the same shaped pressure distribution in the tool can be dispensed with this function. The plastic material of the protective element can then be used, for example, as heat transition insulation layer or the like. Advantageously or preferably can this with the injection molding plastic compound in the mold cavity Injection mold spreading protective plastic material each but as an adhesion promoter between the injection molding plastic compound and the Decorative or plastic film act. In other words, the so-called Plastic protective element then has two functions, namely initially an Ab shielding the decorative or plastic film to be back-injected from the high injection pressure in the area of the injection gate and later quasi as Adhesive or bonding layer between the injection molding plastic mass (e.g. PA6 substrate) and the decorative or plastic film (e.g. ABS Foil).  

The so-called plastic protective element itself can be designed in various ways his. Analogous to the known prior art, this can be a Protective film act on the back of the decorative film to be back-injected is placed in the area of the sprue gate and in its vicinity. This can be done in the injection mold, but also in advance outside of it, preferably the so-called protective film (before insertion towards the injection molding plastic mass) at least slightly towards Splashing plastic film is connected. Here, various ne fastening techniques are used, for example an adhesive technique, High frequency welding, ultrasonic welding, laser welding, or Friction welding, this connection also depending on the material either on an already pre-formed or not yet formed, d. H. not yet brought into the desired shape decorative or plastic film can be taken.

In an alternative embodiment, this can be a suitable molded part formed plastic protective element before the injection molding Plastic mass suitably arranged or fastened in the injection mold become. For example, electrostatic chip can be used for this NEN, the so-called protective element is by no means only a protective film forms can be. The protective element can also be a suitable one act preformed molded part (so-called injection molding), which, for example, in the Injection gate of the injection mold is inserted.

Is is further illustrated the invention with reference to the accompanying schematic drawings in the form of two preferred embodiments, wherein in the sequence of figures 1 a to 1 c shows a first variant in successive process steps is provided, while FIG. 2 shows a second variant of the stage according to Fig. 1a.

In all of the figure representations, the same elements are identified with the same reference numbers. For example, a plastic film to be back-injected with an injection molding plastic compound (also called decorative film) bears the reference number 1 . In an injection molding tool 2 , of which only the two mold halves 2 a, 2 b that delimit the (usual) mold cavity, a molded body geometrically defined by the mold cavity is to be injected onto the back 1 a of the plastic film 1 , which is formed by a injection molding plastic compound 3 introduced into the mold cavity is formed.

The injection molding plastic compound 3 is introduced into the mold cavity of the injection mold 2 via a so-called injection molding 4 , which is located in the mold half 2 a on the left in the figures, while the plastic film 1 with its visible or front side on the mold cavity facing surface of the right-hand mold half 2 b rests. The injection gate 4 is placed with respect to the mold cavity in the mold half 2 a in such a way that it is oriented essentially centrally to the surface of the plastic film 1 .

As was explained before the description of the figures, the back of the mold cavity 1 a facing the plastic film 1 is protected by a so-called plastic protective element 5 , which at least melts during the back injection, from direct action of the injection molding plastic compound introduced, thereby protecting itself the surface of the plastic protective element 5 related prior to introducing the injection molding plastic mass 3 in the injection molding tool 2 on the film rear side 1 a extends only over a limited area surrounding the Spritzangusses 4, and wherein the introduction of the injection molding plastic mass 3 of this protective element 5 as far melts that its plastic material is distributed substantially over the entire surface of the film back 1 a or completely in the injection molding plastic compound 3 .

In the exemplary embodiment according to FIGS. 1a-1c, the plastic protective element 5 is designed as a protective film which, if necessary, was at least slightly connected to the plastic film 1 to be injection molded or attached to it before the injection molding compound 3 was introduced. This so-called initial state is shown in FIG. 1 a , the so-called decorative film 1 with protective film 5 lying on the mold half 2 b in the vicinity of the injection gate 4 (and of course lying opposite this).

In the next process step according to FIG. 1b, the injection molding plastic compound 3 is introduced into the mold cavity of the injection molding tool 2 via the injection gate 4 . As can be seen, the protective element 5 or the protective film can optimally fulfill its function, namely shield the decorative film 1 from direct impact of the plastic compound 3 .

In the further course of the process according to FIG. 1c, the mold cavity is completely or almost completely filled with the injection molding plastic compound 3 . The plastic material of the protective element 5 (also referred to here with the reference number 5 ) is distributed essentially over the entire surface of the rear side 1 a of the plastic film 1 , caused by the introduced injection molding plastic compound 3 , which is the initially spatially limited protective element 5 melted so far that its plastic material 5 of the plastic mass 3 as desired (here we sentlichen only over the back of the film 1 a) was distributed. Alternatively, however, the protective element 5 can also be more or less loosened at the end of the process so that its plastic material is more or less uniformly distributed in the final component bil-forming injection molding plastic compound 3 together with the plastic film 1 .

In the embodiment according to FIG. 2, the plastic protective element, also called 5 as a suitable molding 5 molded part 5 is formed, the / is inserted prior to introducing the injection molding plastic mass 3 in the Spritzanguß 4 of the injection mold 2. The further process steps then proceed analogously to those already explained with reference to FIGS. 1b, 1c, ie with the introduction of the injection molding plastic compound 3 through the injection gate 4 , the protective element 5 / the injection molding 5 is shifted onto the back of the film 1 a and protects it in the process Area of the sprue 4 next to the plastic compound 3 . In the further course of the process, the molding 5 melts on and spreads out over the surface of the plastic film 1 or completely in the plastic mass 3 , which, however, is not yet present in the figuratively shown state.

Specifically and generally should be noted that via the protective element 5 in addition to achieve a protective function for the plastic film 1 before in the mold cavity of the injection mold 2 introduced injection molding plastic mass 3 is additionally an advantageous in further aspects, the additive of the introduced plastic mass 3 (melt) to can be attached easily. So this additive can act as an adhesion promoter between the plastic mass / melt 3 and the decorative film 1 . Differing from the illustration of FIG. 1c, the plastic material of the protective element 5, moreover, may also be mixed completely with the plastic mass 3, because then this plastic material is distributed substantially over the entire surface of the film back 1, wherein it is pointed out, that a variety of details can be designed differently from the above explanations without leaving the content of the claims.

Claims (3)

1. A method for back-molding a plastic film ( 1 ) or the like. In a back-molding tool ( 2 ), the spray gate ( 4 ) in particular being directed essentially centrally towards the surface of the plastic film ( 1 ), the back ( 1 a) by means of a plastic protective element ( 5 ), which at least melts during the back injection, is protected from direct exposure to the injection molding plastic compound ( 3 ), characterized in that the surface of the plastic protective element ( 5 ) before the introduction of the Injection molding plastic mass ( 3 ) in the injection mold ( 2 ) based on the film back side ( 1 a) extends only over a limited area of the sprue ( 4 ), and that with the introduction of the injection molding plastic mass ( 3 ) this protective element ( 5 ) melts to the extent that its plastic material extends substantially over the entire surface of the back of the film ( 1 a) or vol constantly distributed in the injection molding plastic compound ( 3 ).
2. The method for back injection according to claim 1, characterized in that the plastic protective element ( 5 ) designed as a protective film ( 5 ) is at least slightly connected to the plastic film ( 1 ) to be injection molded before the injection molding compound ( 3 ) is introduced becomes.
3. The method for back injection according to claim 1, characterized in that the ausgebil Dete plastic protective element as a suitable molded part ( 5 ) before inserting the injection molding plastic mass ( 3 ) in the injection gate ( 4 ) of the injection mold ( 2 ) is inserted.
DE2000120993 2000-04-28 2000-04-28 Rear injection against plastic protector covering sheet in mold, causes protector melting and redistribution Withdrawn DE10020993A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2000120993 DE10020993A1 (en) 2000-04-28 2000-04-28 Rear injection against plastic protector covering sheet in mold, causes protector melting and redistribution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2000120993 DE10020993A1 (en) 2000-04-28 2000-04-28 Rear injection against plastic protector covering sheet in mold, causes protector melting and redistribution

Publications (1)

Publication Number Publication Date
DE10020993A1 true DE10020993A1 (en) 2001-10-31

Family

ID=7640306

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2000120993 Withdrawn DE10020993A1 (en) 2000-04-28 2000-04-28 Rear injection against plastic protector covering sheet in mold, causes protector melting and redistribution

Country Status (1)

Country Link
DE (1) DE10020993A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004082926A2 (en) * 2003-03-21 2004-09-30 Bayer Materialscience Ag Method for insert molding decorative films
DE10320683A1 (en) * 2003-04-30 2004-11-18 Volkswagen Ag Back injecting a decorative material, comprises applying a barrier layer to the decorative material, and back injecting a plastic material
DE10322101A1 (en) * 2003-05-12 2004-12-16 Sai Automotive Sal Gmbh Three-layer molded plastic part for automotive interior trim with manufacturing process
DE10327725A1 (en) * 2003-06-16 2005-01-05 Volkswagen Ag Composite vehicle interior component manufacture involves injection of molten plastic with dissolved blowing agent into a tool and setting process pressure and temperature to expand blowing gas inside tool
DE10346730A1 (en) * 2003-10-08 2005-05-04 Volkswagen Ag Vehicle interior lining panel manufacture involves location of semi-finished sheet layers with an attached support cushion between tool halves with a cavity for cushion location
FR2872733A1 (en) * 2004-10-29 2006-01-13 Faurecia Interieur Ind Snc Manufacture of motor vehicle interior component uses inner protective screen partially covering injection orifice
EP1645390A1 (en) * 2004-10-07 2006-04-12 Burg Design GmbH Injection moulding method for in-mould decorated elements
CN102785327A (en) * 2011-05-20 2012-11-21 雷恩哈德库兹基金两合公司 Method and apparatus for in-mold decoration
DE102013221013A1 (en) * 2013-10-16 2015-04-16 Bayerische Motoren Werke Aktiengesellschaft Fiber composite component with pressure distributor insert

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4122412A1 (en) * 1991-07-06 1993-01-14 Bayer Ag Moulding prodn. with decorative surface - by inserting decorative material with edge bent inwards in injection moulding tool

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4122412A1 (en) * 1991-07-06 1993-01-14 Bayer Ag Moulding prodn. with decorative surface - by inserting decorative material with edge bent inwards in injection moulding tool

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004082926A2 (en) * 2003-03-21 2004-09-30 Bayer Materialscience Ag Method for insert molding decorative films
WO2004082926A3 (en) * 2003-03-21 2005-03-31 Bayer Materialscience Ag Method for insert molding decorative films
DE10320683A1 (en) * 2003-04-30 2004-11-18 Volkswagen Ag Back injecting a decorative material, comprises applying a barrier layer to the decorative material, and back injecting a plastic material
DE10320683B4 (en) * 2003-04-30 2016-09-29 Volkswagen Ag Process for the injection molding of a decorative material and composite product that can be produced by the process
DE10322101A1 (en) * 2003-05-12 2004-12-16 Sai Automotive Sal Gmbh Three-layer molded plastic part for automotive interior trim with manufacturing process
DE10327725B4 (en) * 2003-06-16 2015-02-26 Volkswagen Ag Process for producing a composite component and composite component produced by the process
DE10327725A1 (en) * 2003-06-16 2005-01-05 Volkswagen Ag Composite vehicle interior component manufacture involves injection of molten plastic with dissolved blowing agent into a tool and setting process pressure and temperature to expand blowing gas inside tool
DE10346730A1 (en) * 2003-10-08 2005-05-04 Volkswagen Ag Vehicle interior lining panel manufacture involves location of semi-finished sheet layers with an attached support cushion between tool halves with a cavity for cushion location
DE10346730B4 (en) * 2003-10-08 2014-07-31 Volkswagen Ag A method of manufacturing an interior trim panel of a vehicle
EP1645390A1 (en) * 2004-10-07 2006-04-12 Burg Design GmbH Injection moulding method for in-mould decorated elements
FR2872733A1 (en) * 2004-10-29 2006-01-13 Faurecia Interieur Ind Snc Manufacture of motor vehicle interior component uses inner protective screen partially covering injection orifice
CN102785327A (en) * 2011-05-20 2012-11-21 雷恩哈德库兹基金两合公司 Method and apparatus for in-mold decoration
DE102011102722A1 (en) * 2011-05-20 2012-11-22 Leonhard Kurz Stiftung & Co. Kg Method and device for in-mold decorating
US9090009B2 (en) 2011-05-20 2015-07-28 Leonhard Kurz Stiftung & Co. Kg Method and apparatus for in-mold decoration
DE102011102722B4 (en) * 2011-05-20 2017-05-24 Leonhard Kurz Stiftung & Co. Kg Method for in-mold decorating
DE102013221013A1 (en) * 2013-10-16 2015-04-16 Bayerische Motoren Werke Aktiengesellschaft Fiber composite component with pressure distributor insert

Similar Documents

Publication Publication Date Title
US8216501B2 (en) Process for producing molded parts, in particular decorative part and/or trim part for the passenger compartment of a vehicle
US9352490B2 (en) Method for producing an interior trim for a motor vehicle, including a substrate and a coating having the appearance of wood
JP3230526B2 (en) Method of producing absorber for absorbing sound waves
DE19914092C2 (en) Method and device for producing a trim and trim part and trim and trim part produced thereafter
US4802939A (en) Method for attaching a fastening tape to a molded article
US4693921A (en) Fastening tape designed to be attached to a molded article during molding, and its attaching method
JP4010467B2 (en) Convertible top assembly, and method and apparatus for manufacturing the same
TWI273020B (en) Molded parts with fabric surface areas and processes for their production
US6756003B2 (en) Method of attaching thermoplastic attachments to a substrate
JP5639708B2 (en) SMC multilayer component manufacturing method
US20140093665A1 (en) Decorative member for vehicle
US5429786A (en) Method of manufacturing resin member
EP1456543B1 (en) Retaining or fixing element with an adhesive surface for sticking to a support surface
US7100958B2 (en) Trim element, especially for the interior of a motor vehicle, and a method for the manufacture thereof
JP3419240B2 (en) Airbag pad and method of manufacturing the same
DE102011102722A1 (en) Method and device for in-mold decorating
TW200536639A (en) Improved molded parts with metal or wood surface areas and processes for their production
EP1461836A2 (en) Method for the production of light-guiding led bodies in two chronologically separate stages
CN1919576B (en) Apparatus and method of injection molding
DE10153855B4 (en) Method and apparatus for forming a trim component on a substrate
EP1464479A3 (en) Production of optical elements
EP1294552B1 (en) Method for production of a hybrid component
EP1649999A2 (en) Process for producing a form stable object with a flat textile surface, particularly with a fiber reinforced composite coating
CA2234270C (en) Window unit for windows in motor vehicles and the like
KR20070062434A (en) A component for a vehicle interior and a method of assembly

Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8141 Disposal/no request for examination