EP3793796A1 - Moule pour moulage par injection multiple, procédé de moulage par injection multiple et produit ainsi obtenu - Google Patents

Moule pour moulage par injection multiple, procédé de moulage par injection multiple et produit ainsi obtenu

Info

Publication number
EP3793796A1
EP3793796A1 EP19732467.6A EP19732467A EP3793796A1 EP 3793796 A1 EP3793796 A1 EP 3793796A1 EP 19732467 A EP19732467 A EP 19732467A EP 3793796 A1 EP3793796 A1 EP 3793796A1
Authority
EP
European Patent Office
Prior art keywords
mold
injection
injection molding
retractable
product
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
EP19732467.6A
Other languages
German (de)
English (en)
Inventor
Antonio AFFINITA
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.)
Sapa SpA
Original Assignee
Sapa SpA
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 Sapa SpA filed Critical Sapa SpA
Publication of EP3793796A1 publication Critical patent/EP3793796A1/fr
Pending legal-status Critical Current

Links

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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0078—Measures or configurations for obtaining anchoring effects in the contact areas between layers
    • B29C37/0082—Mechanical anchoring
    • B29C37/0085—Mechanical anchoring by means of openings in the layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1657—Making multilayered or multicoloured articles using means for adhering or bonding the layers or parts to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3055—Cars
    • B29L2031/3058—Spoilers

Definitions

  • the present invention regards the field of injection molding of thermoplastic materials. More in detail, the method subject of the present patent application regards a double- or multi- injection molding, for obtaining mechanically constrained multi-material components, avoiding gluing.
  • the double-injection technique is characterised by the injection of two different materials into the same cavity, but through two different nozzles. In case of injection of more than two materials, then we have multi -injection.
  • This over-molding technique uses a rotatable hydraulic or electrical plate. One half of the mold is fixed on this plate, mounted on the movable plane of the pressing machine in vertical position. After injecting the first material, by means of the main injection unit, the rotary plate displaces the mold and positions it so as to allow the injection of the second material.
  • Aerodynamic spoilers are also commonly manufactured in this manner.
  • an object of the present invention is to offer perfect adhesion between the various parts of the same component of the vehicle, obtained by means of double- or multi-injection molding, thanks to solutions that are directly applied inside the mold, without requiring subsequent machining steps, including gluing.
  • Said mold is a common mold for double-injection or multi -injection molding, possibly with rotary or translating table, provided with at least two nozzles or a plurality of nozzles suitable to introduce into said mold at least one pair of thermoplastic materials for obtaining a product consisting of a first material and at least one second material.
  • These molds are characterised by at least one retractable projection that can take on a first extended configuration suitable to project into the interspace of the mold.
  • This retractable projection can also advantageously take on a second retracted configuration, which does not project into the interspace, letting the injected thermoplastic material to spread to all available spaces.
  • Preferably present in the mold are a plurality of retractable projections.
  • said retractable projections are positioned at the superimposition zone provided between the various materials that will form the end product. Even more advantageously, in order to solve mechanical strength problems in case of an explosion, said retractable projections are organized according to a plurality of axes comprised between 3 and 10 axes, preferably 4-5 axes.
  • the method for obtaining said products uses the mold described previously and follows the steps of:
  • housings will be created in said first material having diameter and depth corresponding to the diameter and length of the retractable projections;
  • the method will comprise a step of rotating said rotary table before proceeding to said step of second injection.
  • the method will comprise a step of translating said translating table before proceeding to said step of second injection.
  • the previously described method and mold may be advantageously used for obtaining products consisting of more than two materials, with suitable technological solutions.
  • at least one second group of retractable projections is suitable to take on said first extended configuration at a second superimposition zone provided between the second material and a further material.
  • step of receding the second group of retractable projections and a step of third injection in which said further material is injected into the mold, penetrating into the housings created in said second material and thus forming the provided nail heads suitable to mechanically constrain the second material and the further material.
  • the obtained product will have at least one superimposition zone between at least one pair of materials, possibly with different colors.
  • Said superimposition zone which will have a surface area comprised between 2% and 20% of the surface area occupied by each material, will comprise said nail heads consisting of the extension of the second material into the special houses provided in the first material.
  • provided for in the method may be a step for heating the superimposition zone between the two materials so as to chemically activate it and facilitate adhesion.
  • the components of the vehicle, with which the present invention seems to perfectly fit, are the two-coloured or multi-coloured aesthetic components of the interior of the vehicle, preferably the upright of the front door and the aerodynamic spoilers.
  • FIGURE 1 shows an interior door upright of a vehicle 10 shown in which are the first material 11 and the second material 12 and the superimposition zone 13 between the two with the dashed line.
  • FIGURE 2 illustrates the rear of the door upright 10 of the previous FIG. 1 in which the nail heads 14 that follow a plurality of alignments can be seen in the superimposition zone 13.
  • FIGURE 3 shows a cross-sectional view of the nail head 14 which mechanically constrains the first material 11 with the second material 12 in the superimposition zone 13 between the two.
  • FIGURE 4 shows the sole component consisting of the second material 12 of an aerodynamic spoiler, in which the nail heads 14 are shown.
  • FIGURE 5 shows the sole component consisting of the first material 11 of the same aerodynamic spoiler of FIG. 4. Detailed description of the invention
  • FIG. 3 shows is a significant section of the product 10 obtained using the mold subject of the present invention with the method associated thereto.
  • the product 10 is an internal upright of the door of a motor vehicle, consisting, for aesthetic purposes, of two colors, and thus two different thermoplastic materials.
  • the section shows the first material 11 which has the housings that are occupied by the second material 12, forming nail heads 14. All the nail heads 14 are arranged in a superimposition zone 13 with surface area equivalent to about 10% of the surface area occupied by said first and second material 11-12.
  • FIG. 2 which represents the rear face, i.e. the face that cannot be seen from within the vehicle, of the upright thus obtained, it is clear that the nail heads 14 are organized according to 4 different axes.
  • the mechanical constraint that is created between the first and the second material 11-12 is much more effective than the sole chemical constraint that could be obtained by gluing at the superimposition zone 13 between the materials.
  • a second type of product 10 obtained according to the teachings of the present invention is an aerodynamic spoiler whose components are represented in Figs. 4 and 5. Assuming to be able to separate the two components resulting from the two injections that lead to obtaining the spoiler (an impossible task considering the strong mechanical adhesion between the two injected parts).
  • Fig. 5 illustrates the result of the first injection and Fig. 4 shows the product of the second injection.
  • FIG. 3 could be a significant section for both represented products 10 (door upright and spoiler).
  • the mold used for obtaining said products 10 is a common double-injection mold in which retractable projections were arranged at the position desired for said nail heads 14.
  • the retractable projections are suitable to reversibly take on a first extended configuration and a second retracted configuration.
  • the positioning of the retractable projections must coincide with the position of the nail heads 14, thus they must be in the provided superimposition zone 13 of the two materials 11-12, organized along 4 different axes, so as to distribute the mechanical stress to the utmost.
  • the method consists of the following steps:

Landscapes

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

Abstract

L'invention concerne un moule et procédé de moulage par injection multiple permettant d'obtenir un produit (10) constitué d'un premier matériau (11) et d'au moins un deuxième matériau (12), ledit moule étant pourvu d'au moins un élément saillant rétractable, approprié pour adopter une première configuration, allongée, apte à faire saillie dans l'espace intermédiaire du moule pendant l'injection du premier matériau (11) de sorte à créer au moins un logement dans le premier matériau (11) ; ledit élément saillant rétractable étant susceptible d'adopter une deuxième configuration, rétractée, pendant l'injection du deuxième matériau (12), de sorte à libérer le logement préalablement formé dans le premier matériau (11) et à permettre l'introduction du deuxième matériau (12) dans ledit logement, ce qui forme au moins une tête de clou (14) appropriée pour contraindre mécaniquement le premier matériau (11) avec le deuxième matériau (12).
EP19732467.6A 2018-05-16 2019-05-15 Moule pour moulage par injection multiple, procédé de moulage par injection multiple et produit ainsi obtenu Pending EP3793796A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000005434A IT201800005434A1 (it) 2018-05-16 2018-05-16 Stampo per lo stampaggio a multi-iniezione, metodo di stampaggio a multi-iniezione e prodotto così ottenuto
PCT/IB2019/054010 WO2019220356A1 (fr) 2018-05-16 2019-05-15 Moule pour moulage par injection multiple, procédé de moulage par injection multiple et produit ainsi obtenu

Publications (1)

Publication Number Publication Date
EP3793796A1 true EP3793796A1 (fr) 2021-03-24

Family

ID=63080361

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19732467.6A Pending EP3793796A1 (fr) 2018-05-16 2019-05-15 Moule pour moulage par injection multiple, procédé de moulage par injection multiple et produit ainsi obtenu

Country Status (3)

Country Link
EP (1) EP3793796A1 (fr)
IT (1) IT201800005434A1 (fr)
WO (1) WO2019220356A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609570A (en) * 1951-01-22 1952-09-09 Elmer L Danielson Method for forming a multipart plastic article
IT1013365B (it) * 1973-06-11 1977-03-30 Automotive Prod Co Ltd Perfezionamento nelle disposizioni di pastiglie di attrito per freni a disco e simili
JPS50119063A (fr) * 1974-03-06 1975-09-18
JPS5924643A (ja) * 1982-07-31 1984-02-08 Toyoda Gosei Co Ltd 成形用金型
IT1161072B (it) * 1983-02-21 1987-03-11 Carrara Elio Testa di nastro per telai senza navetta, nonche' stampo per la sua realizzazione
ATE184680T1 (de) * 1994-01-25 1999-10-15 Alusuisse Bayrisches Druckguss Verfahren zur herstellung eines deckels aus leichtmetallguss sowie deckel aus leichtmetallguss
US7108825B2 (en) * 2003-08-13 2006-09-19 Lear Corporation Multi-shot molding method and assembly
CA2636373C (fr) * 2006-05-04 2016-11-22 Jean-Pierre Giraud Procede de moulage par injection de couplages mecaniques entre des elements moules
FR2975036B1 (fr) 2011-05-10 2013-05-17 Hutchinson Profile moule par multi-injection formant un joint d'etancheite ou un enjoliveur pour carrosserie de vehicule automobile, et son procede de fabrication.
US20160082629A1 (en) * 2013-06-21 2016-03-24 Modi Consulting And Investments Pty Ltd. Overmoulding process having intermediate heating step

Also Published As

Publication number Publication date
IT201800005434A1 (it) 2019-11-16
WO2019220356A1 (fr) 2019-11-21

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