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
  • B29C45/14—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
• • 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
  • B29C45/1418—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 the inserts being deformed or preformed, e.g. by the injection pressure
  • B29C45/14262—Clamping or tensioning means for the 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
  • B29C45/14065—Positioning or centering articles in the mould
• • 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
  • B29C45/14008—Inserting articles into the mould
  • B29C45/14016—Intermittently feeding endless articles, e.g. transfer films, to the mould

Definitions

• the invention relates to a molding tool for injection molding a plastic film with a plastic melt.
• the mold has a first
• the invention also relates to a corresponding method for producing a
• Plastic part as well as plastic parts made with the molding tool according to the invention or manufactured with the with the
• the present invention has for its object to provide an improved mold.
• the object of the invention is achieved with the mold according to
• the mold according to claim 1 is a mold for injection molding a plastic film with a plastic melt.
• This mold comprises a first mold part and a second one
• the first mold part comprises a decoration surface area and a clamping surface area arranged in the region of the outer edge of the decoration surface area.
• this first mold part comprises a recess region which is arranged within the clamping surface region and / or in the outer edge of the clamping surface region or at a distance from the outer edge of the clamping surface region.
• Mold tool part includes an inlet opening for the plastic melt and a projecting portion which is provided for engagement in the recess portion of the first mold part.
• the inlet opening in the second mold part is preferably designed as an inlet channel.
• the plastic film between the two mold parts is inserted, in such a way that they pass through
• Forming tool part is stretched.
• the projecting region of the second mold part is arranged in such a way that that it engages with the tool closed in the recess area of the first mold part. This will be between the first
• Mold part and the second mold part at least rests on the clamping surface area of the first mold part arranged arranged plastic film in the recess area of the first mold part under tensioning the plastic film and held there.
• Inlet opening in the, preferably preheated to about 30 ° C to 70 ° C, mold is inserted. It is thus obtained a wrinkle-free decoration of the plastic molding in the decorating area, because by the flat, smooth resting of the film on the clamping surfaces and the
• the plastic film can remain wrinkle-free during the back injection. If the
• the tensioning of the plastic film used in the mold is ensured, characterized in that in the first mold part a
• Projection area is formed, which when closing the tool by Merging the two tool parts automatically come into mutual engagement, so that the intermediate, that is, the recessed area between the recess portion and protruding, plastic film is taken through the projection area in the recessed area, preferably in the manner of a drawing operation.
• the recessed area is preferably formed directly in the first mold part as a recessed channel or otherwise shaped recess.
• the projection region is also preferably formed directly in the second mold part,
• the recessed area is preferably designed as a groove-shaped channel and the projecting area preferably as a strip-shaped elevation.
• the recessed area is in the first mold part and the
• Projecting portion in the second mold part preferably located directly in the region of the outer edge of the clamping surface region or at a small distance from the outer edge of the clamping surface region.
• Projecting portion in the second mold part preferably located directly in the region of the outer edge of the clamping surface region or at a small distance from the outer edge of the clamping surface region.
• an arrangement immediately within the clamping surface area is also possible.
• the recessed area of the first mold part and the protruding area of the second mold part form an interlocking engagement means by which the interposed plastic film is tensioned by entrainment.
• the projecting area can also be formed from one or more different materials from the material of the molding tool. For this purpose, it is advantageous if the projection area as a separate part in a the
• the projecting portion may be made of, for example, a metal such as copper or brass, or of plastic or rubber.
• the projecting area may also consist of a Composite material or have multiple layers, in particular have a surface coating. A comparatively soft material may be advantageous in order to stress the plastic film less strongly mechanically. Rubber or one with rubber or silicone or the like
• Material coated projection region may be advantageous in order to obtain a particularly good grip against the plastic film and to improve the above-described entrainment.
• it may be advantageous for certain applications, for example, with a comparatively rough surface of the plastic film facing the projection area, if the surface of the projection area is particularly smooth and slippery and has, for example, a Teflon coating.
• the projection area and the recess area cooperating therewith can completely enclose the decorating area or by means of
• Interruptions may be subdivided into subareas. But they are too
• the projection area in the form of a nose or a pin and the recess area in the form of a correspondingly counter-shaped recess e.g. be formed in the form of a cup.
• the projection area and the recess area have a continuous radius or radii, in order to ensure uniform clamping during closing of the mold
• Surface texture and / or thickness of the plastic film may also be advantageous specially profiled projection areas and / or recessed areas, for example, with continuous radii (coarse structure), on which smaller driver elements (fine structure) are arranged, eg rough
• Partial surfaces small spikes or similar.
• the molding tool has a fixing device, by means of which the plastic film to be backfilled can be fixed to rest on the first mold part on the clamping surface area of the first mold part.
• This fixation can for example by
• Plastic film is stretched in a wrinkle-free arrangement.
• the fixing device the
• Fixing device objected to the clamping surface area of the first and / or second mold part and is arranged outside the cavity.
• the fixing device is arranged only partially or completely surrounding the recess area of the first mold part. Furthermore, it is possible that the fixing device as
• Conveyor of the plastic film is formed and / or as one at the first or supported on the second tool part pressing device is formed.
• the clamping surface area of the first mold part is arranged completely circumferentially around the decoration surface area.
• Clamping area of the first mold part is only partially arranged around the Dekorier vom Kunststoff. Due to the completely surrounding arrangement, a uniform clamping support of the plastic film during injection molding in the plastic tool is ensured.
• the clamping surface region of the first mold part is formed as a strip-shaped surface.
• the strip-like design favors the sealing of the cavity and ensures that the plastic film in the
• the recess area of the first mold part is arranged only partially or completely surrounding the decorating area and / or the clamping surface area of the first mold part. Essential in the arrangement of
• Recess area and the projecting area is that the plastic film in the decorating area can be stretched evenly.
• the projection region of the second mold part is arranged congruently with the recess region of the first mold part.
• the second mold part has a clamping surface area.
• the clamping surface area is when the tool is closed
• An essential objective in the back-injection of the plastic film is to obtain a molded article which is to be decorated with the plastic film right into the outer edge of the surface of the molded article intended for this purpose. Furthermore, it is desirable that the molding has a sharp edge and the decoration extends into the sharp edge and ends exactly in the edge region.
• the edge is formed as an angular edge, preferably at a right angle, and is formed completely or largely without any rounding in the edge region.
• the second mold part forms a molding surface in the cavity.
• This mold surface forms an angular edge with the decorating surface.
• the edge is formed completely or largely without rounding.
• the second mold part in the cavity forms a mold surface which adjoins the decorating surface in a common aligned surface.
• the clamping surface area of the first mold part can form sealing surfaces with a mating surface of the second mold part when the plastic film is interposed, that is to say lying between them, when the mold is closed. In this way, it can be avoided that during the process of back injection of the plastic film with the plastic melt
• Mold tool part exits.
• the manufacturing method according to claim 16 provides the production of a plastic molding having a surface decorated with a plastic film and realizing the design features discussed above.
• the production method provides as method steps which follow one another directly or else follow one another with intermediate further method steps: Step a): Arranging the plastic film (4) on the first
• Mold tool part such that the decorating surface is covered.
• the clamping according to step b) takes place simultaneously with the closing of the mold. It can be
• step b) fixing and / or biasing of the arranged according to step a) on the first tool part plastic film.
• Figure 1 shows a sectional view of a mold of a first
• FIG. 2 shows a perspective view of the upper mold part in FIG. 1.
• FIG. 3 shows a perspective view of the lower mold part in FIG. 1.
• FIG. 4 shows a sectional view of a molding tool of a second
• FIG. 5 shows a sectional view of a molding tool of a third embodiment.
• FIG. 6 shows a sectional view of a forming tool of a fourth
• FIG. 7 shows a sectional view of a forming tool of a fifth
• the mold 1 shown in Figure 1 is composed of two mold parts 2, 3.
• Figure 1 shows the mold in closed
• the plastic film 4 is in the preferred shown in the figures.
• Embodiments multilayer structure and has a carrier film, which consists of a thermoplastic film with a layer thickness between 6 pm and 300 pm, more preferably between 10 pm and 50 pm.
• the formulation of the carrier film is preferably selected such that the glass transition temperature of the carrier film is between 10 and 200 ° C., more preferably between 20 and 150 ° C.
• the carrier film is preferably made of PET, BOPP, PVC, PC, PET-PC, polypropylene (PP), ABS, ABS-PC, polystyrene, PMMA.
• the carrier film can be used as a single-layer material or as a composite material, e.g. be present as a laminate of a plurality of individual sheets and / or coated with one or more paint layers.
• the paint layers for example
• Adhesive layers or protective layers or layers are Adhesive layers or protective layers or layers
• the plastic film 4 further layers on the
• Carrier film are arranged, in particular a heat-activatable
• the decorative layer can thereby decorative layers, such. opaque, translucent or transparent lake layers, replicate resist layers, reflective layers or metal layers, and / or functional layers such as e.g. electrical interconnects of metal and / or conductive polymers, electronic components, optoelectronic components or photosensitive components.
• the release layer has in particular a layer thickness of 0.001 to 0.5 pm, the decorative layer in particular a layer thickness of 0.1 to 50 pm and the adhesive layer in particular a layer thickness of 0.01 to 10 pm.
• the decorative layer can have a motif as an endless pattern, the exact location between the motif and molding does not matter.
• the decorative layer may also have a single image as a motif, which is to be applied in a precise position on the molding.
• the optical sensors control a conveyor of the plastic film, which transports the plastic film in the mold, preferably as a continuous web of a roll or as a single sheet.
• the plastic melt used are preferably thermoplastics such as ABS, ABS-PC, polypropylene (PP), polycarbonate (PC), polystyrene, ABS-PC, PMMA, PET, PET-PC or combinations of these materials.
• the mold 2 - the lower mold in FIG. 1 - has a decorating surface 21.
• Mold tool part - has an inlet channel 31 for the plastic melt. Between the mutually facing surfaces of the two tool parts 2, 3, a cavity 11 is formed. This cavity 11 forms the cavity of the
• Forming tool i. the space in which the via the inlet channel 31
• plastic film 4 it is essential that the plastic film 4 to be back-injected, as shown in FIG. 1, is arranged taut in the closed mold.
• For clamping the plastic film 4 is on the lower tool part 2 is a flat
• the clamping surface 22 is formed as a strip-shaped surface which is formed directly adjacent to the decorative surface 21 and surrounds this as a closed annular surface. The inner edge of this ring
• a plane clamping surface 32 running around in the manner of a closed ring is likewise formed in the surface facing the lower tool part 2. It is as clamping surface 32 congruent with the clamping surface 22 of the lower tool part 2, i. it is in their dimensions and in their arrangement designed so that when the tool is closed, the clamping surface 32 is arranged flush with the clamping surface 22 in alignment with the hinterspritzende
• Plastic film 4 interposed, that is, between the clamping surface 22 and clamping surface 32 is disposed horizontally.
• the clamping surfaces 22 and 32 lie flat on the bottom or the top of the plastic film 4. This can best be seen in the sectional view in FIG. It is essential that in the upper tool part 3 at the outer edge of the clamping surface 32 an engagement bar 33 is arranged, which engages complementarily in the formed in the lower tool part 2 recess channel 23.
• the engaging strip 33 which can also be seen in a perspective view in FIG. 2, is designed as a circumferential protruding strip which surrounds the annular clamping surface 32 in the same manner in the manner of a closed ring, as in FIG
• the plastic film 4 of recess channel 23 and engaging strip 33 is acted upon within predetermined surface areas, in particular predetermined clamping zones.
• the plastic film 4 may have different properties in these clamping zones than on the remaining surface.
• openings may be provided in the plastic film 4, in the recess channel 23 and engagement bar 33 engage or the plastic film 4 has in the clamping zones on a different layer structure, either individual layers are removed, for example, the adhesive layer or additional layers additionally provided are, for example, adhesive layers or non-stick layers or others
• the fixing frame 5 is omitted in the perspective Figures 2 and 3. It is preferably designed as a peripheral fixing frame 5, which is arranged at a distance from the outer edge of the circumferential recess channel 23. It ensures that the plastic film 4 rests flat on the clamping surface 22 of the lower tool part 2 before closing the tool and is fixed in this position on the tool part 2.
• the circumferential engagement strip 33 of the upper tool part 3 comes into engagement with the circumferential recess channel 23 in the lower tool part 2.
• the area on the lower tool part 2 on the clamping surface 22 resting and fixed on the fixing frame plastic film 4 is in the range between Engagement strip 33 and recessed channel 23 pulled in, so that the
• Plastic film 4 is stretched over the circumferential clamping surface 22 and finally clamped in the closed position of the tool between the lower clamping surface 22 and the upper clamping surface 32 wrinkle-free, surface clamped.
• plastic film 4 forms a seal of the mold 1 in the closed position.
• the cavity 11 is formed by the cavity formed between the two mold parts 2, 3 with the mold 1 closed.
• the upper mold part 3 has a recess which is bounded by the inner edge of the upper clamping surface 32. As can be seen in FIGS. 2 and 3, this recess is substantially cuboid. It has rounded corners in the lateral edges.
• the lower boundary of the cavity 11 is formed by the lower mold part 2. In FIG. 1, this lower boundary of the cavity 11 is the decoration surface 21, which extends through the inner edge of the lower one
• Clamping surface 22 is limited and in the case of Figure 1 in the same plane as the clamping surface 22 is arranged in alignment.
• the on the lower mold part 2 resting on the decorating surface 21 between the mold parts 2 and 3 interposed plastic film 4 is back-injected with the introduced via the inlet channel 31 during the injection molding process plastic melt.
• the plastic film may be a hot stamping foil or else another plastic foil with or without carrier foil.
• decorating with a transfer foil e.g. a hot stamping foil from a carrier foil and a transfer layer or another foil with a carrier foil detachably arranged thereon is removed during removal of the carrier foil
• Figure 4 shows a second embodiment of a mold 1, which is a modification of the first embodiment shown in Figures 1 to 3.
• the recess formed in the upper tool part 3 has a concave upper inner wall which, however, as shown in FIG Figure 1 forms a right-angled edge, since the concave upper inner wall thus expires at right angles in the flat bottom.
• Figure 5 shows a third embodiment of a mold 1, which is also modified only by the design of the cavity 11 with respect to the first embodiment and also with respect to the second embodiment.
• the difference with respect to the first exemplary embodiment is shown in FIG. 5 in that the decorating surface 21, which forms the lower boundary of the cavity, is convex. This convex decor surface closes with its outer edge directly to the inner edge of the plane
• FIG. 6 shows a fourth embodiment, which is also modified compared to the preceding embodiments only in the embodiment of the cavity 11.
• the difference from the first embodiment in Figure 1 is that the decorative surface 21 is concave in the lower mold 2, in such a way that the concave decorative surface 21 in the illustrated case with the plane of the clamping surface 22 forms a right-angled edge ,
• the plastic film 4 used taut when the mold is closed, as shown in FIG. 6, does not rest on the decorating surface 21, but merely rests on the clamping surface 22 with its underside resting at a distance above the decorating surface 21.
• Plastic film 4 is in the same manner as in the embodiments in Figures 1 to 5, the upper clamping surface 32 of the upper mold 3 flat overlying to form a sealing region which seals the cavity between the mold parts 2, 3.
• Plastic melt is introduced in Figure 6 via the inlet channel 31, the plastic film 4 is softened by the plastic melt on the one hand by the high temperature of the plastic melt and on the other hand to
• Decorating surface 21 moves toward until the plastic film 4 comes to the flat contact on the decorating surface 21 and further stretched.
• FIG. 7 shows a fifth modified embodiment. This is a modification of the embodiment shown in FIG. The difference from Figure 6 is that in the upper
• Form tool part 3 no recess is formed, but the upper boundary wall of the cavity through the flat bottom of the upper
• Forming tool 3 is formed, this flat bottom in the plane of the upper clamping surface 32 is arranged in alignment. If, during the injection process, the plastic melt via the inlet channel 31 in the mold in Figure 7
• Embodiments of the present invention enable the provision, preferably flatter, of plastic parts, i. Plastic moldings which are IM-decorated, wherein the decorating surface 21 may have a sharp edge or a sharp edge, which is up to the edge or edge, preferably
• plastic parts have no, preferably visible, seam or "parting line".
• wrinkle-free decorated plastic parts can be produced.
• the plastic melt or injection molding material acted practically like a squeegee or a wedge and the edge radius caused a Drawing of the plastic film within the mold.
• Edge radius pulled in and / or extends into the edge radius it is no longer necessary to provide an edge radius which effects a "funnel-like" focusing of the plastic film 4. Therefore, the present invention makes it possible to make the edge shapes of the molded plastic parts more diverse
• embodiments of the invention can provide plastic parts which are more precisely decorated can, as it was previously possible.
• Embodiments of the invention provide particularly advantageous to durably tighten the plastic film 4 before and during injection molding so that the plastic film 4 in the decorating area 21 is wrinkle-free.
• a plastic receiving space which is formed between the upper side of the first mold part 2 and the underside of the second mold part 3 in the Dekorier vom Scheme 21, in the plane defined by the clamping surface area 22 plane, ie in
• Embodiments of the invention advantageously provide that the plastic film 4 is held or clamped under tension by means of the engagement arrangement 33 and the recessed area 23.
• tensioning the plastic film 4 by means of the engagement arrangement 33 and the recess area 23 the plastic film 4 can be greatly deformed.
• the clamping surface region 22 prevents wrinkling of the plastic film 4 in the decorative surface region 21.
• the engagement arrangement 33 and the recessed area 23 can act as tension elements because the
• the tension of the plastic film 4 can be increased when closing the molding tool 1. Furthermore, the plastic film 4 can be pulled smooth when closing the molding tool.
• Recess area 23 to be arranged such that the voltage of the
• Plastic film 4 is independent of the contour shape of the Dekorier vom Kunststoff Schemes 21 and / or the plastic receiving space 11. The tension of
• Plastic film 4 is preferably carried out from the center of the
• Decorating area 21 be wrinkled wrinkle-free.
• the clamping surface area 22 is adapted to the contour of the Dekorier vom Kunststoff Schemes 21.

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

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

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Family Applications (1)

Country Status (7)

Families Citing this family (4)

Citations (7)

Family Cites Families (15)

• 2011
  • 2011-02-10 DE DE102011010971A patent/DE102011010971A1/de not_active Withdrawn
• 2012
  • 2012-02-08 CN CN201280008276.3A patent/CN103354777B/zh active Active
  • 2012-02-08 EP EP12703706.7A patent/EP2673126B1/de active Active
  • 2012-02-08 JP JP2013552882A patent/JP2014504973A/ja active Pending
  • 2012-02-08 KR KR1020137020454A patent/KR20140034746A/ko not_active Ceased
  • 2012-02-08 US US13/983,188 patent/US9505154B2/en not_active Expired - Fee Related
  • 2012-02-08 WO PCT/EP2012/000569 patent/WO2012107222A1/de not_active Ceased

Patent Citations (7)

Non-Patent Citations (1)

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