WO2013093064A1 - Procédé de production d'un élément en matière plastique à parois épaisses - Google Patents

Procédé de production d'un élément en matière plastique à parois épaisses Download PDF

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Publication number
WO2013093064A1
WO2013093064A1 PCT/EP2012/076779 EP2012076779W WO2013093064A1 WO 2013093064 A1 WO2013093064 A1 WO 2013093064A1 EP 2012076779 W EP2012076779 W EP 2012076779W WO 2013093064 A1 WO2013093064 A1 WO 2013093064A1
Authority
WO
WIPO (PCT)
Prior art keywords
core part
plastic
thick
edge part
core
Prior art date
Application number
PCT/EP2012/076779
Other languages
German (de)
English (en)
Inventor
Wolfgang Kemper
Original Assignee
Astroplast Kunststofftechnik Gmbh & Co. Kg
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 Astroplast Kunststofftechnik Gmbh & Co. Kg filed Critical Astroplast Kunststofftechnik Gmbh & Co. Kg
Publication of WO2013093064A1 publication Critical patent/WO2013093064A1/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
    • B29C45/14—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
    • B29C45/14778—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 article consisting of a material with particular properties, e.g. porous, brittle
    • 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
    • B29C45/0003—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of successively moulded portions rigidly joined to each other
    • 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
    • B29C45/1615—The materials being injected at different moulding stations
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0043—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks preventing shrinkage by reducing the wall thickness of the moulded article
    • 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
    • B29C2045/14131—Positioning or centering articles in the mould using positioning or centering means forming part of the insert

Definitions

  • the present invention relates to a method for producing a thick-walled plastic part.
  • the object of the present invention is to provide a method for producing a thick-walled plastic part by injection molding, in which the cycle time with respect to
  • An inventive method for producing a thick-walled plastic part comprises the steps
  • Plastic material in particular by injection molding, and
  • Plastic component if this is conventionally produced in one step with the desired wall thickness.
  • thick-walled plastic parts can be produced with the advantages of a thin-walled plastic part in terms of shorter cycle times. It is achieved by the method presented here to produce a thick-walled plastic part so that initially at least one core part, compared to the wall thickness of the finished thick-walled Plastic part may have a relatively small thickness is produced. This at least one core part is then overmolded with a plastic material to form the edge part, which has the desired contour of the plastic component, so that a homogeneous, thick-walled plastic component can be produced.
  • Plastic material for molding the edge part to be encapsulated is plastic material for molding the edge part to be encapsulated.
  • Plastic material to form the edge part are molded.
  • the geometries of the at least one core part and the edge part are chosen so that the at least one core part and the edge part, in particular by undercuts, interlocking projections and depressions, at least partially geometrically penetrate.
  • Encasement with the edge part is heated or kept at temperature such that it is at least partially melted or remains melted.
  • a very homogeneous connection of the at least one core part to the edge part can advantageously be obtained.
  • the at least one core part is thus advantageously designed so that there is an intensive and homogeneous connection with the edge part. This can be done in particular by a corresponding geometry and geometric penetration of the at least one core part with the edge part and / or by a hot core as possible, which is up again or merged with the encapsulation with the edge part.
  • Geometry and temperature is particularly advantageous in this context.
  • the at least one core part and the edge part of the same or at least equivalent in terms of their chemical and / or physical properties
  • Plastic materials can be, at least minimized as much as possible.
  • Injection molding tool in particular using a transfer, insert, or separation slide method is produced.
  • the advantage of this embodiment is that the core part and the edge part in a single injection molding tool (and thus in a process step) can be produced successively without costly removal of the core part.
  • Plastic part is produced in at least two process steps in at least two injection molds.
  • a first step the at least one core part in a first
  • Injection molding tool produced as a pre-molded part.
  • the encapsulation of the edge part takes place in the second process step in a second
  • the positions for the gating of the at least one core part and for the gating of the edge part are chosen differently.
  • the production of the thick-walled plastic part in two or more process steps also leads to a different and primarily suitable choice of
  • Anspritzpositionen the orientation of the plastic material in the at least one core part and the edge part can be designed differently, so that in the plastic component by the at least one core part and the edge part in combination very high
  • weld lines in the plastic component, which weaken the strength of the plastic component and thereby adversely affect.
  • the influence of the weld line on the strength of the plastic component can be minimized in a particularly advantageous manner by the injection points are placed in the at least one core part and in the edge part of different, optimized in view of the achievable strength of the plastic component positions.
  • this spacer means in particular distance projections, spacer ribs or the like, are formed, which are such that they at least some core part of at least some walls and / or shape contours of a Mold cavity of the injection molding tool
  • the distance means can in
  • the shrinkage of the thick-walled plastic part produced by the method described here can be reduced in a particularly advantageous manner. It has surprisingly been found that the formation of cavities and vacuoles can advantageously be prevented or at least minimized by the method presented here. As a result, a controlled and increased strength of the plastic component can be achieved. This is on the one hand by the geometry of the at least one core part as well as by the selected in the production
  • the core part can be provided with a sprue optimized for the shrinkage and orientation of the plastic material.
  • the at least one edge part is then produced with a sprue optimized for the surface, appearance and the automatic production process.
  • Plastic component Again, by appropriate geometric and thermal "division" of the component in the at least one core part and the edge part of the delay of the plastic component can be selectively influenced.
  • the method described here can be realized in particular with the aid of a so-called tandem tool.
  • the core part and the edge part can be produced both in one and in both tool levels.
  • the tandem process ultimately leads to an extension of the cooling time, without the
  • 1a is a perspective view of a core part which is used in a preferred embodiment of a method for producing a thick-walled plastic part
  • FIG. 1b is a plan view of the core part of FIG. 1a
  • FIGS. 1a and 1b shows a side view of the core part according to FIGS. 1a and 1b
  • FIG. 2 shows a perspective, highly simplified elevational view of a mold of an injection molding tool with the core part arranged in a mold cavity
  • Fig. 3 is a perspective view of one according to the method
  • FIG. 4 is a plan view of the plastic part of FIG. 3,
  • Fig. 6 shows a portion of a manufactured by the method
  • Plastic part in which the core part and a peripheral part made of different plastic materials
  • FIG. 7 is a perspective view of a core part and a
  • Such a method comprises the steps
  • At least one core part 2 as shown by way of example in Fig. 1, of a plastic material, in particular by injection molding, and
  • the core part 2 which can be produced in particular by injection molding and whose external shape configuration is adapted in the present case to the outer contour of the thick-walled plastic component 1 which is shown in FIGS. 3 to 5, has in the present case a substantially cuboid shape with rounded corner regions 20, 21, 22, 23 and a central circular recess 24.
  • the core part 2 has two longitudinal sides 25, 26 which are opposite one another and extend parallel to one another, and two likewise mutually opposite and parallel to one another
  • the core part comprises a first flat base surface 29a and a second flat base surface 29b, which likewise extend parallel to one another.
  • each of the two planar base surfaces 29 a, 29 b of the core part 2 in this exemplary embodiment has four spacer projections 40, which in the present case are located near the rounded corner regions 20, 21, 22, 23 are formed on the base surfaces 29a, 29b.
  • each of the two longitudinal sides 25, 26 has two spacer projections 41, which are also formed in the vicinity of the rounded corner regions 20, 21, 22, 23 on the two longitudinal sides 25, 26.
  • the distance projections 40, 41 may be formed in particular conical.
  • three spacer ribs 42 are formed in the present case, which extend over the entire depth of the recess 24 and are arranged offset by 120 ° to each other.
  • the spacer projections 40, 41 and the spacer ribs 42 form, from a functional point of view, spacer means which are designed to form the core part 2 of at least some walls 50 and / or mold contours 51 of a mold cavity 5 for molding the core part 2 with the plastic molding material an edge portion 3 used form 6 of an injection molding tool can space.
  • spacer means which are designed to form the core part 2 of at least some walls 50 and / or mold contours 51 of a mold cavity 5 for molding the core part 2 with the plastic molding material an edge portion 3 used form 6 of an injection molding tool can space.
  • the core part 2 with the plastic material for molding the edge part 3 is encapsulated, which encloses the contour of the core part 2 to form the thick-walled plastic part 1.
  • the thus produced thick-walled plastic part with the core part 2 and this enclosing edge part 3 is shown in Fig. 3 to 5 in several different views.
  • the plastic component 1, whose outer surface is formed by the edge part 3, which surrounds the core part 2, in this case also has an im
  • the plastic component 1 has two opposing and extending parallel to each other
  • the plastic component 1 comprises a first flat base surface 39a and a second flat base surface 39b, which likewise extend parallel to one another.
  • the core part 2 and the edge part 3 can be produced from the same or at least with regard to their chemical and / or physical properties equivalent plastic materials. This makes it possible in an advantageous manner that undesirable influences on the quality of the plastic part 1, the heterogeneous material properties of the used for the production of the core part 2 and the edge part 3
  • Plastic materials can be, at least minimized as much as possible.
  • thick-walled plastic part 1 in which the (at least one) core part 2 and the edge part 3 are made of different plastic materials, is shown in FIG.
  • the thick-walled plastic part 1 can also have, at least in sections, more complex, partially curved contours.
  • Plastic part is produced in one step with the desired wall thickness, significantly shorter cycle times.
  • the reason for this is that in the present case, the sum of the two cooling times for the core part 2 and the edge part 3 is significantly shorter than the cooling time of the component, if this in one step with the desired
  • Wall thickness is produced. This makes it possible that with the method presented here thick-walled plastic parts 1 with the
  • Plastic component 1 has, overmolded, so that as a result, a homogeneous, thick-walled plastic component 1 can be obtained.
  • the geometries of the core part 2 and the edge part 3 are preferably selected so that the at least one core part 2 and the edge part 3, in particular by undercuts, interlocking
  • Protrusions and depressions at least partially geometrically penetrate. In the present case, this penetration takes place through the
  • the core part 2 may be heated or kept at temperature during the encapsulation with the edge part 3, that it is at least partially melted or remains fused.
  • a very homogeneous and stable connection of the core part 2 to the edge part 3 can advantageously be obtained.
  • the positions for the gating of the at least one core part 2 and for the gating of the edge part 3 are selected differently.
  • Plastic material in the core part 2 and edge part 3 can be designed differently (see Fig. 7), so that in the plastic component 1 by the at least one core part 2 and the edge part 3 in
  • weld lines 7, 8 produce, which weaken the strength of the plastic component 1 and thereby adversely affect. Again, the influence of the weld lines 7, 8 can be minimized to the strength of the plastic component 1 in a particularly advantageous manner by the
  • Anspritzpositionen 9, 10 are placed in the core part 2 and the edge part 3 at different, optimized in terms of the strength of the plastic component 1 positions. This situation is in FIG. 7 illustrated in which the (symbolized by arrows here)
  • Anspritzpositionen 9, 10 are selected for the core part 2 and the edge part 3 so that they are offset by 180 ° to each other.
  • Shrinkage of the plastic part 1 can be reduced. It has surprisingly been found that the formation of voids and vacuoles can be prevented or minimized by the method presented here in an advantageous manner. As a result, a controlled and increased strength of the plastic component 1 can be achieved. This is possible on the one hand by the geometry of the core part 2 and by the temperature level selected during production. As in the shrinkage, the inner, hot spots
  • the core part 2 with a for the
  • Shrinkage and orientation of the plastic material optimized sprue be provided.
  • the one edge part 3 is then produced with a sprue optimized for the surface, optics and the automatic production process.

Landscapes

  • 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)

Abstract

L'invention concerne un procédé de production d'un élément en matière plastique à parois épaisses (1), comprenant les étapes suivantes : - production d'au moins une partie centrale (2) en matière plastique, en particulier par moulage par injection, et - enrobage de la partie centrale (2) au moyen d'une matière plastique, dans un moule à injection, pour former une partie marginale (3), qui entoure le contour de ladite au moins une partie centrale (2), dans le but d'obtenir l'élément en matière plastique à parois épaisses (1).
PCT/EP2012/076779 2011-12-23 2012-12-21 Procédé de production d'un élément en matière plastique à parois épaisses WO2013093064A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011122249 2011-12-23
DE102011122249.2 2011-12-23

Publications (1)

Publication Number Publication Date
WO2013093064A1 true WO2013093064A1 (fr) 2013-06-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/076779 WO2013093064A1 (fr) 2011-12-23 2012-12-21 Procédé de production d'un élément en matière plastique à parois épaisses

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4245501A1 (fr) * 2022-03-15 2023-09-20 Wessel-Werk GmbH Procédé de fabrication d'un rouleau de nettoyage, rouleau de nettoyage et buse d'aspirateur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0592442A (ja) * 1991-10-02 1993-04-16 Showa Jushi Kako Kk プラスチツク厚肉成形品の射出成形方法
EP0709173A1 (fr) * 1994-10-25 1996-05-01 Kabushiki Kaisha Bandai Procédé de moulage et dispositif
US20020074688A1 (en) * 2000-12-15 2002-06-20 Smith Keith A. Method of injection molding around the surface of an object
EP2371515A1 (fr) * 2010-04-02 2011-10-05 Faurecia Bloc Avant Procédé de fabrication d'une pièce structurelle de véhicule automobile par surmoulage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0592442A (ja) * 1991-10-02 1993-04-16 Showa Jushi Kako Kk プラスチツク厚肉成形品の射出成形方法
EP0709173A1 (fr) * 1994-10-25 1996-05-01 Kabushiki Kaisha Bandai Procédé de moulage et dispositif
US20020074688A1 (en) * 2000-12-15 2002-06-20 Smith Keith A. Method of injection molding around the surface of an object
EP2371515A1 (fr) * 2010-04-02 2011-10-05 Faurecia Bloc Avant Procédé de fabrication d'une pièce structurelle de véhicule automobile par surmoulage

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Handbuch Spritzgießen", 1 January 2004, HANSER VERLAG, ISBN: 978-3-44-622966-2, article FRIEDRICH JOHANNABER ET AL: "Mehrschichtspritzgiessen zur Beschleunigung des Abkühlvorgangs", XP055057117 *
MICHAEL STRICKER ET AL: "Präzision im Fokus", KUNSTSTOFFE 4/2009, 1 April 2009 (2009-04-01), pages 30 - 34, XP055057119, Retrieved from the Internet <URL:http://www.kunststoffe.de/KU110084> [retrieved on 20130319] *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4245501A1 (fr) * 2022-03-15 2023-09-20 Wessel-Werk GmbH Procédé de fabrication d'un rouleau de nettoyage, rouleau de nettoyage et buse d'aspirateur

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