WO1996009155A1 - Procede et dispositif de moulage par injection - Google Patents

Procede et dispositif de moulage par injection Download PDF

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Publication number
WO1996009155A1
WO1996009155A1 PCT/US1995/011983 US9511983W WO9609155A1 WO 1996009155 A1 WO1996009155 A1 WO 1996009155A1 US 9511983 W US9511983 W US 9511983W WO 9609155 A1 WO9609155 A1 WO 9609155A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
film
molding
portions
cavity
Prior art date
Application number
PCT/US1995/011983
Other languages
English (en)
Inventor
Bryan Michael Kazmer
Roger Alan Steller
Paul S. Toyoda
Christopher William Woods
David Joseph Urig
Original Assignee
The Geon Company
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 The Geon Company filed Critical The Geon Company
Publication of WO1996009155A1 publication Critical patent/WO1996009155A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C45/1418—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
    • 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
    • B29C2045/14213—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 deforming by gas or fluid pressure in the mould cavity
    • 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
    • B29C2045/1427—Clamping or tensioning means for the insert controlling the slip of 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
    • B29C45/1418—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
    • B29C2045/14286—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 means for heating the insert

Definitions

  • the invention is directed to the field of injection molding of thermoplastics and more particularly to film transfer injection molding for manufacture of shaped laminates and the method thereof .
  • the present invention relates to a method and apparatus for injection molding in a single or multiple cavity mold and more particularly to the molding apparatus that has transferred to it initially a film that is shaped by the molding apparatus and thence has a molten plastic compound injected into the mold cavity to form the finished article (s) with the film laminated to a portion of the surface.
  • the invention is also directed to the molding.
  • Film transfer injection molding of a finished laminated article by injection molding in a cavity containing a film raises a challenge to provide desired flow of the film and achieving proper film thickness throughout different regions and contours in the shaped laminate.
  • Various techniques of film pre ⁇ forming have been used off-line, that is in a separate step apart from the injection molding cycle, in attempts to control film thickness and prevent excessive film stretch thinning.
  • the film is clamped when the mold halves are brought together, and certain portions of the film are stretched on contact with the male mold in the first stages while the remaining portions of the film in the mold are out of contact with any mold surface.
  • the prior art molds may clamp the film throughout the non-molding area beginning at the cavity edge, or there may be clamping force more remotely applied, but nevertheless as the film under goes tension, wrinkling occurs. This wrinkling has limited the use of the film insert molding technique. Means for eliminating film wrinkling are still needed.
  • the present invention employs a new technique which allows an overlying film to freely gather over a large area with less stretch thinning.
  • the film is in a confined gap space, is not under a pinch, but is merely in kiss contact with the mold halves.
  • the film can yield over the entire film area.
  • the film can freely move inwardly from a lateral non-molding area to a molding area to thus enhance the uniformity of flow, insuring a more consistent thickness in the contours of the shaped article. This process allows for use of a predetermined film thickness since the overall flow is more consistent.
  • the present invention also eliminates the problem of wrinkling especially at the corners of angular edge portions of the article formed, wherein the film is deflected in a smooth curving circumfrential bend which is out of the plane of the parting line.
  • the preferred bending pattern is around a semicircle. Forcing the film on a circumfrential bend provides a means for ironing wrinkles as the film is drawn therethrough. This is akin to pulling the tensioned film over a mandrel .
  • the present invention is directed to the molding of a laminate article by the use of a pair of mold dies having sections or halves wherein each mold section has a non-molding portion, a molding cavity portion within the parting line and a die clamping portion.
  • a film is located between the mold halves and occupies the non-molding portions and the molding portion but preferably not the clamping portion of the mold.
  • On clamping of the mold halves when the film is not under a pinch but occupies a machined gap designed into the cooperating mold halves, there is free film gathering inward toward the mold cavity with a low extent of film stretch-thinning as the cavity is filled.
  • the thermoplastic material presses the film against one mold half (typically the female half) while allowing the movement of the film located in the non-molding portions of the mold halves to move into the cavity as the thermoplastic material fills the mold cavity.
  • the mold Immediately outward from the parting line the mold provides a bending path for the film by way of complimentary channel and convex portions which causes counter tension and relieves the tendency to wrinkle.
  • the formed laminate article is removed and the edges trimmed.
  • the film coverage is improved and for decorative trim pieces in a variety of industrial and commercial uses, the parting line is totally hidden from view.
  • Fig. 1 is an elevational view in semi-schematic form partly in sectional showing the general arrangement of the apparatus
  • Fig. 2 is a front elevational view of the female half (mold cavity) taken on line 2-2 of Fig. 1;
  • Fig. 3 is a front elevational view of the male half (mold core) taken on line 3-3 of Fig. 1;
  • Fig. 4 is a cross-section side elevational view of the mold halves in their open position taken on line 4-4 of Fig. 1 showing the film location and feed side rails;
  • Fig. 5 is a cross-sectional view of the cooperative mold halves in their closed position before injection of thermoplastic into the cavity space.
  • Fig. 6 is a cross-sectional view of the cooperative mold halves similar to Fig. 5 but with dried, pressurized air acting against the film located against the contour of the female cavity in the mold.
  • Fig. 7 is a cross sectional view of the cooperative mold halves similar to Fig. 5 but with a thermoplastic resin injected into the mold cavity space forcing the film against the female mold contour;
  • Fig. 8 is a side elevational view in cross section of the cooperative mold halves taken on line 8-8 of Fig. 7 showing the film location and feed end caps;
  • Fig. 9 is a cross sectional view in schematic form illustrating the end trimming of the molded article
  • Fig. 10 is a perspective view of the laminated article with a portion thereof in cross section,-
  • Fig. 11 is an enlarged partial cross section view of cooperative mold halves in their closed position before injection of thermoplastic in the area of the side rails which contain a back- cut for film edge wrapping;
  • Fig. 12 is an enlarged partial cross section of the same region as Fig. 11 after injection of thermoplastic showing film edge wrapping to the back side of the molded laminate;
  • Fig. 13 is a perspective view of the trimmed, laminated article with a portion thereof in section, showing edge wrapping of the film.
  • FIGs. 10 and 13 exemplary portions of molded articles 10 and 10", respectively, depicted in the shape of a trim strip which includes a body 12 having a decorative film 14 bonded thereto.
  • Figure 1 depicts a verticle mold portion. As a reference, the depicted mold cavity forms an elongated article.
  • the terms "upper” and lower” refer to the ends of the article.
  • Body 12 is a thermoplastic material suitable for injection molding while film 14 is a film, for example, a clear or pigmented thermoplastic film suitable as an appearance layer, or a scuff layer and/or a weathering layer, and the like.
  • the film 14 is bonded to the adjacent portion of body 12 and becomes integral therewith.
  • Molded article 10 is made by a novel molding assembly 16 and by the method of the present invention as described thereinafter.
  • the molding assembly has a pair of mold sections 18 and 20.
  • mold section 18 is the female mold half and mold section 20 is the male mold half.
  • Male mold section 20 is securely attached to the stationary platen or mold base 21 while female mold section 18 is securely attached to a moving platen or mold base 22, which plate 22 is movable toward or away from the male mold section 20 by any conveying means such as a hydraulic cylinder or ram 23.
  • the male mold section 20 is supplied thermoplastic material from an injection molding device 25, old and well known in the art.
  • Preheated pressurized air is preferably supplied via passageways 26 (figs. 3,4, and 5) through male mold section 20 in a manner well understood in the art to pre-shape film 14 prior to the injection of thermoplastic material into the cavity.
  • the film 14 as depicted in Fig. 1 is vertically transported between the female mold section 18 and male mold section 20 by suitably unrolling the film 14 from a supply roll 28 and a take up roll 29. This orientation is equally applied to horizontal transport.
  • the figures are merely illustrative and not limitative.
  • the molded article may be separated from the non-molded portion of the film by suitable cutters, leaving the lateral edges of the remaining film portion intact so as to enable subsequent advancement of the film for successive injection moldings.
  • the movement of the film 14 between the supply roll 28 and take up roll 29 is controlled by suitable guide rolls, means for controlling tension and means for indexing the film for repetitive moldings in a manner well known in the art .
  • Suitable heater means 30 can be optionally located anywhere between the supply roll 28, guide roll 31 and the female mold section 18 and a lower guide roll 33 to separate the molded article from the film 14 above and below the molded article as well as the sides thereof to maintain the film integrity to be transported downwardly towards the take up roll 29.
  • male mold insert section 20 has its platen or mold base 21 with machined pocket 36 at its central portion and with contours following at the lateral portion with a shoulder 37 and a side 37' .
  • machined pocket 36 is twice the depth of shoulder 37, although the difference in depth is not critical.
  • Fig. 4 depicts the most preferred embodiment wherein machined male mold insert section 20 and overlying side rails 44 and 44' are separate elements of the mold assembly. Less preferredly, side rails 44 and 44 ' and/or end caps 45-46 can be integral with male mold insert section 20. The preferred embodiment is more versatile and allows for fabricating various side rails 44 - 44' and end caps 45 - 46 to secure the machined male mold section.
  • Mold base or platen 21 has longitudinally extending lateral clamp surfaces 38 and 39 that extend for the full length thereof.
  • the end caps have curvilinear channels shown at 71.
  • the male mold insert section 20 is machined along its sides to accept side rails 44 and 44 ' .
  • Side rails 44 and 44 ' are secured to the mold base 20 as by socket head cap screws 34 and retain the male mold insert section 20 within the machined pocket in mold base 21. As depicted in Fig.
  • an upper end cap 45 and a lower end cap 46 are located respectively in the upper and lower end portions of the machined pocket 36 and abut the male mold insert 20.
  • the end caps 45 and 46 are secured to the platen or mold base 21 by socket head cap screws 34.
  • the surface of stationary mold base 21 between the respective longitudinally extending clamping surfaces 38 and 39 and the outer side edges of side rails 44 and 44' as well as end caps 45-46 provides machined pocket surfaces 42 and 42' .
  • the pocket depth plus side rail thickness provide a resulting gap sufficient to allow feeding of film without pinching or locational holding and clamping when the female and male molds are clamped together in the molding process .
  • the machined pocket surfaces 42 and 42' with the installed inserts provide a recess at least about equal and preferably up to about no more than 0.050 in. more than the thickness of the film selected for use.
  • Such machined pocket surfaces 42 and 42' extend upwardly and downwardly on male mold base 21 and merge inwardly around the respective upper and lower caps 45-46 to accommodate the movement of film.
  • the recessed surfaces 42 and 42' of mold base 21 are preferably coplanar with the top surfaces of the side rail inserts 44 and 44 ' and end caps 45-46. In handling films of varying thickness, mold insert side rails and end caps continue the gap through the part line for the film and should not restrict film feeding toward the mold cavity.
  • such clearance at 42 and 42 ' inward from the clamping region between the mold bases (at clamping) should provide a gap of a ⁇ least 0.020 inch and more preferably equal to the upper film manufacturing tolerance specifications corresponding to a nominal 0.020 inch thickness (gauge) .
  • the gap can be pre-selected by exchanging the side rails, and top and bottom end caps which are machined to a thickness to provide exact film gap requirements when secured to shoulder 37.
  • the gap between mold halves at clamping, in the region directly over the side rails and end caps is more critical to properly control film feeding, whereas the machined gap outside of these elements can be larger as at 42-42 ' .
  • the area outward from side rails and end caps is typically a permanent machined pocket in mold base 21, and the gap here is sufficient to accommodate the thickest film potentially used. Any gap ranging from about 0.01 inch to about 0.100 inch or more can be selected in accordance with the thickness of the desired film.
  • the male mold insert 20 presents a male molding portion 43 with four designed corners 43' 43" 43 ' ' ' and 43 lv .
  • An injection nozzle 24 of Fig. 8 is connected to a runner system 54, which contain the sprue means, ie. , passageways for thermoplastic material .
  • the openings into the cavity are shown in Figs . 3 and 4, at 54.
  • Figure 3 shows the preferred aspect for passageways 26, referred to commercially as air poppet valves, for distribution of dry air throughout male insert section 43 as a means for partial film pre- shaping.
  • Figure 4 illustrates the female mold section 18 which is secured in the machined pocket of platen or mold base 22 and has a female molding region 57 with designed contours throughout which terminate into a curvillinear portion 63 then to protruding convex portions 66 and 69.
  • the convex portion extends along the circumference of female mold region 57 and orients the film lying in the gap at a tangent to the side plane of the molded article.
  • the gap is maintained throughout the convex portions and the curvilinar channel 70. This orienting means allows the film to lie perpendicular to the parting line plane.
  • the lateral plane of the film outward of convex portions is parallel to plane of surface 74 on the mold platen.
  • the convex portions provide deflection of the film first toward the male half, then in a semicircular arc at 64, 65, 66 and 69.
  • the channel in side rails 44 - 44 ' and end caps 45-46 extends continuously and circumferentially around the area just outside the parting line of the cavity formed of the male and female halves .
  • the channel is preferably located on the male (core) molding section and the corresponding convex region is located on the female (cavity) molding portion.
  • This configuration can be reversed, wherein the channel is located on the female portion with the convex region 66 located on the male portion, however this would require special routing of the injection melt so as to cross between mold halves and fill from the female side in the reverse from what is illustrated.
  • the male- channel/female-convex portion arrangement provides the least tortuous path for the injection melt.
  • channel 70 and inward edge of convex portions 66 and 69 form a gapped parting line.
  • Surface 74 on mold base 22 is a flat surface which extends to the machined pocket 35 in mold base 22.
  • surfaces 74 and surfaces 38-39 contact each other and provide clamp force area, while the inner peripheral surfaces 42-42' do not contact surface 74 of the female mold.
  • film 14 has width which does not exceed the width of machined pocket surfaces 42-42 ' , so the film is preferably never clamped.
  • the film may be clamped at a suitable distance from the parting line and it is expected that passage of the film through the channel/convex portion will still eliminate wrinkling within the cavity.
  • mold cavity 75 which is the shape of the article to be formed.
  • the clamp area abutting portions which include the outer peripheral surfaces 38-39 of the mold base 21 against the abutting surface 74 on mold base 22;
  • the gap area inward from machined gap edges including: non-molding portions at 42-42', the peripheral surfaces of the side rails 44-44' and end caps 45-46 adjacent to groove 70 and inward where the side rails meet peripheral molding surfaces 50-50' at the part line, (Fig.
  • the film exiting from the parting generally will define where the respective article is trimmed, which thereby defines the periphery or perimeter of the molded article containing the integrally bonded film on at least a portion thereof. In the simplest shape having a front show side and back surface, the film completely covers all the show surfaces and is trimmed at the back plane.
  • the film When the laminated article is placed on a flat surface, the film covers the entire part and no injection material or parting lines are seen.
  • the molding surfaces 50 on the side rails and 50 ' on the end caps converge to the inner most edge of groove 70.
  • the respective ends of the molded article taper toward the parting line as seen in Figs. 2 and 3 along a line joining 43'- 43" and 43 ' ' • -43 iv , which tapered portions are designated as 80 through 85 in Fig. 2 on the female mold section 18.
  • the entire perimeter of the removable inserts containing groove 70 defines a gap that is predetermined by the depth of the inserts.
  • the principal function of channel 70 is to provide an oriented passage of the film so that the film is oriented at the parting line in a pL.ane which is perpendicular to the plane of the peripheral film portion outward of the groove region thus, the film is on a curving bend at the region nearest the parting lines in the mold.
  • the predetermined gap can be the same as the film thickness or it can be greater than the film thickness, such as up to 0.050 inches wider than the film thickness.
  • the gap is advantageously not so much wider than the film thickness so as to allow for residual film wrinkling of the lateral article portions, particularly at the corners. Such gap also permits the flow of air out of the cavity to prevent the trapping of air within the mold cavity. This feature is referred to as venting.
  • Fig. 1 illustrates the supply roll 28 and the take up roll 29 which can be activated to advance a predetermined length of film 14.
  • an optional heater means 30 Prior to movement of the film 14, and/or during movement of the film 14, an optional heater means 30 is employed to preheat the film.
  • pressurized hot air is preferably directed from a plurality of passageways 26 in the male mold section 20 towards the film 14 to facilitate the conformance of the film to the curved female mold surfaces on closing of the mold sections.
  • the film 14 lies in the gap of the non-molding portions of the female mold and male mold sections which is a tangential touching or a mere kissing of the film to the mold parts which hereinafter is meant and defined as a gentle touching between the parts that would allow the film to slide on the surface of the non-molding portions of the mold sections.
  • This is in sharp contrast to a film in a prior art mold which is compressed at the part line. Stretching occurs from there and the film is drawn from a smaller square area. This prior art clamping of film is unyielding and prevents gathering movement from a large area.
  • laminate molded articles are provided with more constant film cross sectional thickness. There is less film stretch thinning at the extremes and the incidence of film crease marks is eliminated.
  • the orientation of the film at the part line is in the plane congruent to the cavity edge, the film outward from the part line having been bent through groove 70 and around the convex portions acting as a mandrel.
  • molten thermoplastic is injected through the injection nozzle 24 of the abutting portions of the mold sections as previously described, and through the passageways 54 in the male mold section 20 into the cavity 75, filling such cavity 75 and onto the back surface of film 14 firmly pressing it into the precise shape of the female mold surface.
  • the traversal in channel 70 is preferably a smooth directional movement of the film from the non-molding portion to the molding portion and stresses the film in such a way as to cancel the internal stresses that generate wrinkling.
  • the female mold section 18 may be moved away from the male mold section 20 and the trim strip 10 moved away from the female mold section 10 by tensioning the film strip between the guide rolls 31 and 33. Thereafter the film strip 10 is moved downwardly to a position where the formed trim strip is opposite the trimming device 32 where the trim strip is trimmed from the film along the parting line as defined herein above.
  • air actuated steel ruled dies clicker dies
  • Figure 11 illustrates a partial cross section showing mold halves in closed position prior to injection of thermoplastic material.
  • Female mold section 18 contains convex portion 59 with an undercut (back cut) 60.
  • Side rails 61 contains a radiused lip 62 which is at the male parting line. The parting line is thus rendered inward from the lateral most region of the cavity. This allows edge wrapping of the film.
  • the back cut can run around the entire article edge or a portion thereof. In the illustrated figure, a back cut would also be included in the upper and lower end caps running the entire periphery of the cavity.
  • Figure 12 illustrates the effect of injection of thermoplastic material forming body 12.
  • Figure 13 illustrates the cross section showing the edge wrap of the film at 72.
  • the extent of back cut depth is limited to about 1/32 of an inch plus the film thickness without requiring moving parts in the mold.
  • An edge wrap of about 0.030 inch is desirable and therefore an under cut plus film thickness totaling 0.030 should not render the molded part unextractable from the female mold half after mold parting. Extraction of the article can be accomplished while the hot modulus is low enough to deformation yield necessary to peel the part from the female mold. Trimming of an edge wrapped laminate would preferably be made at or just beyond the part line on the male side of the molding.
  • the selection of thermoplastic material which will allow an undercut is within the skill and preference of the skilled practitioner and is beyond the scope of this disclosure.
  • the invention can be applied to a mold having no moving parts as is illustrated, or the invention can be readily adapted to molds with slides, i.e., retracting means for removing under cuts.
  • the use of flexible thermoplastic materials and small undercuts resulting in forced mold release is more preferred.
  • Injection Molding Handbook D. Rosato, et al . editors, Van Nostrand Reinhold, Inc. 1986, Chapter 3.

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

Abstract

L'invention porte sur un appareil et un procédé de moulage d'un article présentant un film fixé à une partie du corps de l'article fini, le film étant transporté depuis un rouleau débiteur vers un rouleau récepteur de façon à couvrir la cavité du moule femelle et la zone contiguë du moule femelle constituant la surface ou la partie ne contribuant pas au moulage du moule femelle. Le film est préchauffé pour permettre son préformage et son adaptation aux contours de la cavité du moule femelle. Lorsque le moule femelle et le moule mâle entrent en contact le film est très préférablement retenu entre certaines parties du moule pour permettre ses mouvements vers l'intérieur en direction de la cavité du moule alors qu'on injecte le matériau thermoplastique dans ladite cavité pour le fixer au film tandis que l'article se forme dans la cavité du moule.
PCT/US1995/011983 1994-09-23 1995-09-19 Procede et dispositif de moulage par injection WO1996009155A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US31108994A 1994-09-23 1994-09-23
US08/311,089 1994-09-23

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WO1996009155A1 true WO1996009155A1 (fr) 1996-03-28

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2744948A1 (fr) * 1996-02-19 1997-08-22 Allibert Ind Procede d'habillage d'une piece plastique injectee par une feuille dont on controle la tension et moule pour realiser la piece finie
EP0890424A1 (fr) * 1997-07-11 1999-01-13 IBS Brocke GmbH & Co. KG Procédé de fabrication d'objets en matière plastique revêtus
NL1012957C2 (nl) * 1998-09-01 2000-03-02 Corell Resin Technology Bv Werkwijze voor het vervaardigen van een kunststof voorwerp, alsmede spuitgietmatrijs.
WO2000012282A1 (fr) * 1998-09-01 2000-03-09 Corell Resin Technology B.V. Procede de fabrication d'un objet en plastique et moule d'injection
WO2000073038A1 (fr) * 1999-06-01 2000-12-07 Packtech Limited Procede et dispositif permettant de fabriquer des articles moules en plastique, possedant au moins deux couches
EP1609574A1 (fr) * 2004-06-23 2005-12-28 Grupo Antolin Ingenieria, S.A. Système et méthode pour fabriquer des pièces en plastique présentant un revêtement textile
GB2415406A (en) * 2004-06-25 2005-12-28 Linpac Automotive Ltd A decorative trim and method of manufacture
DE102011102830A1 (de) * 2011-05-30 2012-12-06 Hbw-Gubesch Kunststoff-Engineering Gmbh Herstellung von foliendekorierten Kunststoffteilen mit Durchbrüchen oder tiefen Einschnitten mittels IMD-Spritzguss
US20130307186A1 (en) * 2011-02-10 2013-11-21 Leonhard Kurz Stiftung & Co. Kg Molding Tool for Back-Molding a Plastic Film with a Plastic Melt
DE102014217173A1 (de) * 2014-08-28 2016-03-03 Frimo Group Gmbh Verfahren und Vorrichtung zur Herstellung von Formteilen
EP3017930A1 (fr) * 2014-11-07 2016-05-11 Compagnie Plastic Omnium Moule comprenant un moyen de chauffage pour le surmoulage d'un insert composite
US10611070B2 (en) 2017-01-03 2020-04-07 Olbrich Gmbh Method and apparatus for producing a trim component having a molded rim at an edge thereof

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Cited By (15)

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FR2744948A1 (fr) * 1996-02-19 1997-08-22 Allibert Ind Procede d'habillage d'une piece plastique injectee par une feuille dont on controle la tension et moule pour realiser la piece finie
EP0890424A1 (fr) * 1997-07-11 1999-01-13 IBS Brocke GmbH & Co. KG Procédé de fabrication d'objets en matière plastique revêtus
NL1012957C2 (nl) * 1998-09-01 2000-03-02 Corell Resin Technology Bv Werkwijze voor het vervaardigen van een kunststof voorwerp, alsmede spuitgietmatrijs.
WO2000012282A1 (fr) * 1998-09-01 2000-03-09 Corell Resin Technology B.V. Procede de fabrication d'un objet en plastique et moule d'injection
WO2000073038A1 (fr) * 1999-06-01 2000-12-07 Packtech Limited Procede et dispositif permettant de fabriquer des articles moules en plastique, possedant au moins deux couches
CH693562A5 (de) * 1999-06-01 2003-10-15 Packtech Ltd Verfahren und Vorrichtung zur Herstellung eines zumindest zweischichtigen Formkörpers aus Kunststoff und nach dem Verfahren hergestellten Formkörper.
EP1609574A1 (fr) * 2004-06-23 2005-12-28 Grupo Antolin Ingenieria, S.A. Système et méthode pour fabriquer des pièces en plastique présentant un revêtement textile
GB2415406A (en) * 2004-06-25 2005-12-28 Linpac Automotive Ltd A decorative trim and method of manufacture
US20130307186A1 (en) * 2011-02-10 2013-11-21 Leonhard Kurz Stiftung & Co. Kg Molding Tool for Back-Molding a Plastic Film with a Plastic Melt
US9505154B2 (en) * 2011-02-10 2016-11-29 Leonhard Kurz Stiftung & Co. Kg Molding tool for back-molding a plastic film with a plastic melt
DE102011102830A1 (de) * 2011-05-30 2012-12-06 Hbw-Gubesch Kunststoff-Engineering Gmbh Herstellung von foliendekorierten Kunststoffteilen mit Durchbrüchen oder tiefen Einschnitten mittels IMD-Spritzguss
DE102011102830B4 (de) * 2011-05-30 2014-11-13 Hbw-Gubesch Kunststoff-Engineering Gmbh Herstellung von foliendekorierten Kunststoffteilen mit Durchbrüchen oder tiefen Einschnitten mittels IMD-Spritzguss
DE102014217173A1 (de) * 2014-08-28 2016-03-03 Frimo Group Gmbh Verfahren und Vorrichtung zur Herstellung von Formteilen
EP3017930A1 (fr) * 2014-11-07 2016-05-11 Compagnie Plastic Omnium Moule comprenant un moyen de chauffage pour le surmoulage d'un insert composite
US10611070B2 (en) 2017-01-03 2020-04-07 Olbrich Gmbh Method and apparatus for producing a trim component having a molded rim at an edge thereof

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