WO2011121026A1 - Pièce moulée par injection modifiée, et son procédé de production - Google Patents

Pièce moulée par injection modifiée, et son procédé de production Download PDF

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Publication number
WO2011121026A1
WO2011121026A1 PCT/EP2011/054913 EP2011054913W WO2011121026A1 WO 2011121026 A1 WO2011121026 A1 WO 2011121026A1 EP 2011054913 W EP2011054913 W EP 2011054913W WO 2011121026 A1 WO2011121026 A1 WO 2011121026A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
outer skin
component
injection molded
injection
Prior art date
Application number
PCT/EP2011/054913
Other languages
German (de)
English (en)
Inventor
Ulrich Stieler
Original Assignee
Ulrich Stieler Kunststoff Service E.K.
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 Ulrich Stieler Kunststoff Service E.K. filed Critical Ulrich Stieler Kunststoff Service E.K.
Priority to EP11712817A priority Critical patent/EP2552664A1/fr
Publication of WO2011121026A1 publication Critical patent/WO2011121026A1/fr

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
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0058—Liquid or visquous
    • B29K2105/0061—Gel or sol

Definitions

  • the present invention relates to the field of article fabrication by injection molding.
  • the present invention relates to a modified injection molded part and a method for its production.
  • Injection molding is a very economical process for producing shaped articles (injection molded parts or molded parts) and is particularly suitable for automated mass production.
  • the respective material often a plastic, from which the injection-molded part is to be produced, usually liquefied or melted under the influence of heat and optionally pressure.
  • the resulting melt is then injected under high pressure into the mold cavity (also referred to as "cavity") of a closed two-part injection mold where it cools, after solidification the finished molding can be removed from the opened injection molding tool Moldings are obtained, as well as molded parts with foamed core.
  • Hollow moldings can be obtained by means of fluid-assisted injection molding (fluid injection technology).
  • the cavity is filled with the melt in a first step and injected in a second step, a fluid under high pressure such as a gas or water, in the interior of the still liquid melt, wherein it displaces the melt and formed a cavity in the melt , After cooling, the fluid is drained off.
  • EP 1 161 333 B1 A method and an apparatus for producing molded parts by injection molding are described in EP 1 161 333 B1 and EP 1 280 710 B1.
  • the moldings described above are formed from a single material component. Also in the foamed molding described above, the core is formed of the same material as the outer shell and chemically bonded thereto.
  • the present invention relates to a molded article comprising an outer shell of a first material and a core of a second material, wherein the article constructed of outer shell and core can be obtained by injection molding.
  • the present invention thus relates to a multi-component injection molded part having as a first component an outer skin of a first material surrounding a core as a further component, wherein the core is formed of a material which is different from the first material.
  • the core may be constructed of two or more materials.
  • the inventive multi-component injection molded part can be obtained by first in a first step, a melt for the first material for the formation of the outer skin in the cavity of a Injected in a second step, the liquid or molten material for the formation of the core is injected under pressure into the melt for the outer skin injection molding tool injected. Similar to the fluid during fluid-assisted injection molding, the material for the core displaces the material for the outer skin, so that, as a result, the desired core is formed.
  • the material for the core remains in the finished injection molded part after solidification and is not drained like the fluid.
  • the multi-component injection-molded part according to the invention can be produced with conventional injection molding systems, such as those used for gas-assisted injection molding for the production of hollow molded parts or for the production of foamed molded parts.
  • melt is used here representative of a flowable state of the material, it is to be processed by injection molding.
  • FIGS. 1 a to 1 e show schematically the individual stages of a gas injection process for producing a hollow molded part
  • FIGS. 2a to 2e schematically show the individual steps of a variant of the gas injection method with a secondary cavity.
  • FIGS. 1a to 1e the sequence of a gas injection process is shown with reference to a schematically shown injection molding machine A.
  • the injection molding machine A consists essentially of the tool 1 with cavity 2 and the injection unit 3 with plasticizing 4 and injection drive 5.
  • the tool 1 is connected to a closing unit, not shown here, via which the tool is opened, closed and locked.
  • the material is converted into a flowable state, for example, with heating and optionally pressure, often to a melt.
  • the tool 1 is closed, the melt 9 is located in the injection unit 3, which is connected to the cavity 2 via an injection channel 6.
  • the control of the injection process via a valve 7, such as a needle valve nozzle at the outlet opening for the melt 9 in the plasticizer 4th
  • valve 7 is closed. After opening the valve 7 in Figure 2, the melt is injected by injection drive 5 into the cavity 2.
  • the valve 7 After filling the cavity 2 with the desired amount of melt, the valve 7 is closed and the injection process of the melt interrupted ( Figure 1c). At the same time, the injection of the fluid, for example of a gas via the injection channel 8 into the melt in the cavity 2. The fluid pushes the liquid melt in front of him and fills the cavity as shown in Figure 1c.
  • the gas pressure is kept in the melt ( Figure 1d) and after solidification of the gas pressure is relieved (Figure 1e).
  • a cavity (10) remains in the solidified melt (FIG. 1e).
  • the valve 7 is closed.
  • FIG. 1 A variant of the method and the apparatus of Figures 1 a to 1 e is shown schematically in Figures 2a to 2e.
  • the same reference numerals designate the same components as in Figures 1 a to 1 e.
  • the cavity 2 is connected to a so-called downstream secondary cavity 1 1 via a channel 12.
  • a valve 13 for closing or opening the connection between cavity 2 and side cavity 1 1 is provided.
  • FIG. 2 a Analogously to FIG. 1 a, the state before injecting the melt 9 into the cavity 2 with the valve 7 closed is shown in FIG. 2 a. Also, the valve 1 3 is closed.
  • valve 7 is open and the melt is injected into the cavity 2, the valve 13 is closed.
  • valve 7 In the stage shown in Figure 2c valve 7 is closed, it begins the injection of the fluid through the fluid injection channel 8, wherein Venti l 1 3 is opened. As shown in FIG. 2d, the fluid drives the melt in front of it and displaces it into the secondary cavity 11. After cooling and solidification of the melt, the fluid is discharged through the fluid injection channel 8, as indicated schematically in Figure 2e by the direction of the arrow to reference numeral 8. By the volume of the secondary cavity 1 1, the amount of melt 9 is given, which is displaced by the fluid introduced from the cavity 2.
  • An advantage of this variant is that predictable, repeatable wall thicknesses can be obtained.
  • the production of the multicomponent injection molded parts according to the invention can in principle be carried out according to the known methods and with the known devices for gas injection technology, as have been explained above with reference to two examples.
  • the essential difference is that instead of the fluid for forming the cavity in the molding, the material for the formation of the core is injected into the melt.
  • the injection of the material for the core can be done in principle by the same procedure as the injection of a fluid for the formation of the cavity. However, unlike the fluid for forming a cavity, the material for forming the core remains in the solidified molding.
  • the injection of the material for the core may be done after the injection of the first material for the outer skin or simultaneously with the injection of the first material for the outer skin.
  • the injection of the material for the core can be done directly in the cavity 2 or via the injection channel. 6
  • all materials can be processed by means of an injection molding process for the first material for forming the outer skin and as a material for the core.
  • plastics such as polystyrene, polyamides, polyurethanes, cellulose ethers and cellulose esters, polyethylene, polymethacrylic acid esters, thestroplasts, tool-hardening thermosetting plastics and so on.
  • a material is selected that is different from the first material for the formation of the outer skin and preferably does not bond with the first material.
  • a material is chosen that does not enter into a chemical compound with the first material for the formation of the outer skin.
  • the core may be hard, soft or liquid.
  • the core may be formed from a gel.
  • the core can be a foam.
  • the outer skin surrounds the core like a shell and encloses it.
  • the outer skin forms a solid shell.
  • the multi-component injection molded part according to the invention is suitable for numerous applications in which a solid outer skin encloses a core.
  • the core can be firm, soft or gel-like and even liquid.
  • the outer skin may be a rigid component which may be filled with a core of a softer material, in particular a gel or a liquid.
  • the multi-component injection molded part according to the present invention may be a shoe sole, shoe inserts, protective pads for body parts in athletic or professional activities, protective pads for the west, vehicles or components to be protected, etc., an ink cartridge, lighters, storage for gel chimneys or other burning devices.
  • the core may be a gel or other cushioning material to dampen the impact pressure when walking or, in particular, walking. Examples of these are polyurethane gel or a foam resin such as ethylene-vinyl acetate copolymer.
  • the material for the core is the liquid ink.
  • the first material for the outer skin forms the lighter body and the material for the core forms the fuel in the body.
  • the injection molded part may be a soundproofing element.
  • the outer skin of a wood-plastic composite material (WPC-Wood Plastic Composite) and the core may be formed of a soft plastic.
  • the outer skin may be formed of a metal and the core component of silicone / elastomer or thermosetting plastic.
  • the core surrounded by the skin can perform a variety of tasks, such as improving the absorption performance of the multi-component molded part, by allowing the material for the core to quickly distribute the forces acting on the molded part over the entire core.
  • the core can also be used as a heat storage or heat conductor, or cold storage or be provided with appropriate protective fluids.
  • the injection molded article may be a foodstuff, the main component being a first edible raw material and the core component being an edible raw material other than the first edible raw material.
  • the core component may be an active ingredient with the outer skin acting as a carrier.
  • the core may be formed of a material that changes its properties after opening the outer skin and escape from the interior of the multi-component injection molded part according to the invention.
  • the core may be a pressurized fluid that expands upon opening the skin and removes heat from the environment.
  • the core may be pressurized carbon dioxide. After opening the outer skin, the carbon dioxide expands and removes the environment heat here.
  • Such an injection molded part can be used, for example, for extinguishing fires.
  • the multi-component injection molded part according to the invention can be used for numerous applications.
  • the core can also consist of more than one material.
  • the core itself may have a multilayer structure, wherein another material is injected into the material for the core.
  • any objects which include an outer shell and another component surrounded by the outer shell can be obtained in a single process flow.

Landscapes

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

Abstract

L'invention concerne une pièce moulée par injection, formée de plusieurs composants, présentant une enveloppe externe en un premier matériau, et un noyau en un matériau qui est différent du premier matériau de l'enveloppe externe. L'invention concerne en outre un procédé de production de la pièce moulée par injection formée de plusieurs composants, conforme à l'invention, sur la base d'une technologie d'injection de gaz.
PCT/EP2011/054913 2010-03-30 2011-03-30 Pièce moulée par injection modifiée, et son procédé de production WO2011121026A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11712817A EP2552664A1 (fr) 2010-03-30 2011-03-30 Pièce moulée par injection modifiée, et son procédé de production

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010013440 2010-03-30
DE102010013440:6 2010-03-30

Publications (1)

Publication Number Publication Date
WO2011121026A1 true WO2011121026A1 (fr) 2011-10-06

Family

ID=44123176

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/054913 WO2011121026A1 (fr) 2010-03-30 2011-03-30 Pièce moulée par injection modifiée, et son procédé de production

Country Status (2)

Country Link
EP (1) EP2552664A1 (fr)
WO (1) WO2011121026A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012204392B3 (de) * 2012-03-20 2013-04-25 Lisa Dräxlmaier GmbH Innenausstattungsteil, insbesondere Instrumententafel mit einer Airbagklappe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0740385A (ja) * 1993-07-30 1995-02-10 Kyoraku Co Ltd 電磁波遮蔽性成形品の製造方法
US20030070259A1 (en) * 2001-10-15 2003-04-17 Brown William R. Elastomeric grips for personal care products
EP1161333B1 (fr) 1999-03-15 2005-02-23 Ulrich Stieler Procede et dispositif pour la production d'articles moules par injection mousses physiquement
EP1738889A1 (fr) * 2005-07-02 2007-01-03 Dieter Mankau Procédé pour former des parties fonctionelles creuses dans des matériaux plastiques ou mineraux
EP1280710B1 (fr) 2000-03-15 2007-11-28 Ulrich Stieler Fermeture pour contenants de type bouteille, et procede de production de ladite fermeture
US20080230661A1 (en) * 2007-03-19 2008-09-25 Sony Corporation Suction cup and fabrication method therefor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0740385A (ja) * 1993-07-30 1995-02-10 Kyoraku Co Ltd 電磁波遮蔽性成形品の製造方法
EP1161333B1 (fr) 1999-03-15 2005-02-23 Ulrich Stieler Procede et dispositif pour la production d'articles moules par injection mousses physiquement
EP1280710B1 (fr) 2000-03-15 2007-11-28 Ulrich Stieler Fermeture pour contenants de type bouteille, et procede de production de ladite fermeture
US20030070259A1 (en) * 2001-10-15 2003-04-17 Brown William R. Elastomeric grips for personal care products
EP1738889A1 (fr) * 2005-07-02 2007-01-03 Dieter Mankau Procédé pour former des parties fonctionelles creuses dans des matériaux plastiques ou mineraux
US20080230661A1 (en) * 2007-03-19 2008-09-25 Sony Corporation Suction cup and fabrication method therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012204392B3 (de) * 2012-03-20 2013-04-25 Lisa Dräxlmaier GmbH Innenausstattungsteil, insbesondere Instrumententafel mit einer Airbagklappe
US9623827B2 (en) 2012-03-20 2017-04-18 Lisa Draexlmaier Gmbh Instrument panel with an airbag flap

Also Published As

Publication number Publication date
EP2552664A1 (fr) 2013-02-06

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