EP2454070A1 - Dispositif et procédé de fabrication de pièces moulées en plastique à paroi épaisse présentant une réduction des dépressions en surface, par moulage par injection ou injection-compression - Google Patents

Dispositif et procédé de fabrication de pièces moulées en plastique à paroi épaisse présentant une réduction des dépressions en surface, par moulage par injection ou injection-compression

Info

Publication number
EP2454070A1
EP2454070A1 EP10724351A EP10724351A EP2454070A1 EP 2454070 A1 EP2454070 A1 EP 2454070A1 EP 10724351 A EP10724351 A EP 10724351A EP 10724351 A EP10724351 A EP 10724351A EP 2454070 A1 EP2454070 A1 EP 2454070A1
Authority
EP
European Patent Office
Prior art keywords
cavity
temperature
tool
injection
wall
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.)
Withdrawn
Application number
EP10724351A
Other languages
German (de)
English (en)
Inventor
Arne Schmidt
Marc Poth
Christian Eberle
Werner Höss
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.)
Evonik Roehm GmbH
Original Assignee
Evonik Roehm GmbH
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 Evonik Roehm GmbH filed Critical Evonik Roehm GmbH
Publication of EP2454070A1 publication Critical patent/EP2454070A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • B29C2045/5635—Mould integrated compression drive means
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C2045/7343—Heating or cooling of the mould heating or cooling different mould parts at different temperatures
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C2045/7393—Heating or cooling of the mould alternately heating and cooling
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76531—Temperature
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76732—Mould
    • B29C2945/76735—Mould cavity
    • B29C2945/76739—Mould cavity cavity walls
    • 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
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses

Definitions

  • the invention relates to an apparatus and a method for producing thick-walled plastic moldings by injection molding or injection compression molding method, wherein the
  • the invention relates to a
  • plastic lenses for spectacles For example, plastic lenses for spectacles.
  • thermoplastic molding compounds are used, depending on the purpose of use polystyrene, polymethylmethacrylate ..
  • Polycarbonate or copolycarbonate can be used.
  • lens blanks of uniform wall thickness are produced in cycle times of less than 30 seconds, and normally a standard injection molding process is used.
  • the molding compound is in the filling phase via small-sized channels in the cavity of the tool brought in. Because amorphous plastics in the cooling phase, a high density reduction in the range up to 10
  • the plastic compound is introduced into a pre-enlarged cavity in a first filling phase, and this plastics molding compound is subsequently embossed by means of an axial tool embossing.
  • Mass weight which is introduced in the first filling phase in the vorveriererte cavity, corresponds to the mass weight of the later removed parts. With the axial tool movement becomes the pre-enlarged cavity
  • the standard injection compression molding process is used for simple optical parts to avoid sink marks as a result of material shrinkage.
  • Extension of the mold cavity is compensated. This is achieved for example by attaching systems for generating a compression-pressure-dependent counterforce in the form of introduced into the cavity elastic elements. While such an approach may be suitable for reducing shrinkage on a case-by-case basis, it is complex and has not been established in the practice of injection molding or stamping.
  • the D2 describes a method and an apparatus for producing thick-walled blanks for optical lenses, in which one proceeds in two stages. In a first stage, a thin lens is first passed through
  • Production stage increased by supplying plastic material to its final thickness, i. "Inflated" is.
  • WO 2004/058476 A3 document 4 or D4 discloses a method for controlling the production of molded parts.
  • the heating elements are regulated higher. Is the temperature in the cavity or at
  • Mold core too high the circulation in the cooling circuit is increased.
  • the goal is in any case, printing and
  • Plastic moldings preferably made of thermoplastic materials, with relatively high optical quality permitted.
  • Yet another object of the invention was a
  • the shortened cycle time should not be at the expense of a holding pressure phase or a prolonged holding pressure phase.
  • Another object of the invention is to provide a method for producing thick-walled plastic moldings by injection molding or injection-compression molding, the method should enable fast, safe and cost-effective the production of plastic bodies, with simple means.
  • an apparatus for producing thick-walled plastic moldings by injection molding or stamping comprising a tool for injection molding or - embossing with a cavity, is characterized in that the tool adjacent to the cavity
  • the body of the tool to a temperature Ti and the wall area to a temperature different from the temperature T 2 T 2 tempered, it is possible to improve the known devices to streamline the production of thick-walled plastic moldings and all of the standards institutes and the industrial workers with respect to the physical and chemical properties of the resulting molded articles outstanding requirements.
  • the resulting shaped bodies have regard to the number and / or the expression of
  • the device of the invention for producing thick-walled plastic moldings by injection molding or stamping comprises a tool for injection molding or stamping with a
  • injection molding or injection molding tool is synonymous with the terms “injection molding tool”
  • tool is always to be understood cumulatively to mean an injection molding tool and an injection compression molding tool. These terms are well known to those skilled in the art.
  • the tool of the device according to the invention has a cavity. This is understood in the context of the invention, a cavity, the injection molding or
  • the invention includes devices with tools that have more than one cavity, be it in one or more parting planes.
  • a tool is characterized inter alia by the fact that it is attached to the cavity
  • the tool encloses one or more cavities and, viewed from a cavity, the area of the tool becomes the region of the tool close to the cavity
  • the thickness or thickness of the near-cavity wall portion of the tool can vary over a wide range. Likewise, the thickness or thickness of the
  • the ratio of Thickness of the near-cavity wall area of the tool to the thickness of the cavity-free area of the tool in the range of 1: 100 to 2: 1.
  • the ratio for a tool can be constant. However, it may look different for a tool in several places
  • Thickness ratios come, depending on the specific structure of the tool and the special process requirements for the tool.
  • Ratio of the thickness of the near-cavity wall area to the cavity-distal body of the tool Values in the range of not greater than 1: 2, more suitably not greater than 1: 5 and most suitably not greater than 1:10
  • the thickness of the near-cavity wall portion of the tool may also extend over a wide range.
  • the device of the invention is characterized in that the thickness of the
  • Wall area between about 1/20 to 1/4 of the total thickness of the tool cavity remote body and near cavity wall area makes. Even more preferred for the device is when the thickness of the wall portion is about 1/10 to 1/5 of the total thickness of the cavity far wall and cavity near wall cavity tool.
  • the device according to the invention is characterized in particular in that the body of the tool is at a temperature Ti and the wall area at one of the
  • Temperature Ti different temperature T 2 are formed tempered. This configuration allows
  • Tempered edge regions of the tool for a longer period of time as is the case with conventional devices, with the result that the number of
  • the cavity near wall area of the tool and the rest of the body can be in terms of
  • Temperability in different ways from each other decouple may be possible to provide the cavity near areas of the tool with a special coating, which can be controlled for example via resistance heaters or inductively.
  • a special coating which can be controlled for example via resistance heaters or inductively.
  • thermo-ceramic coatings Use come, such as thermo-ceramic coatings.
  • the subsequent coating of existing tools can be somewhat costly.
  • the control of the two temperature control can be done in different ways. In addition to the already mentioned control via resistance heaters or an inductive control, it is possible to use the temperature
  • liquid media such as water, oil or steam to regulate.
  • An expedient device therefore has an exchangeable cavity frame, which is preferably made of steel. This is an inner lining of the mold cavity, the
  • interchangeable cavity frame consist mainly in the fast and individual adaptability of the frame to new Kavticianenformen and the possibility of quick replacement. It is also possible to use the cavity frame to produce from such materials, which have a very low inertia in terms of temperature behavior. The use of such comparatively expensive
  • the device of the invention is preferably suitable for injection molding.
  • Device according to the invention is also the injection-compression molding. In contrast to injection molding, the device in the
  • Injection molding additionally has a movable mold core or embossing stamp.
  • a movable mold core or embossing stamp is included in injection molding.
  • the mandrel or die separately to a temperature T 3rd
  • thermo-ceramic the mandrel or die has a coating of thermo-ceramic.
  • the invention also provides a method for
  • thermoplastic molding compound in the flowable state in the tool of the device; - causes the injected plastic molding compound to solidify; and - the solidified plastic molding demolded; where you are
  • VST Vicat softening temperature
  • DIN EN ISO 306 precursor: DIN 53460
  • the Vicat temperature is measured with a needle (with a circular area of 1 mm 2 ). This is loaded with a test load of 10 N (test load A) or 50 N (test load B).
  • the test specimen with a permissible thickness of 3 to 6.4 mm has a defined heating rate of 50 or 120 K / h
  • VST is reached when the indenter reaches a penetration depth of 1 mm.
  • four parameter combinations result, namely, VST / A50, VST / A120, VST / B50, and VST / B120, for which purposes the VST / B50 method is used for purposes of the invention unless otherwise specified.
  • Cavity near wall area particularly useful the Kavticiansrahmen described above, the tool before and / or tempered during the injection process by means of suitable heating to a higher temperature level, compared with the temperature level of the rest of the body of the tool.
  • the temperature control of the cavity-near edge region, preferably of the cavity frame, is expedient cyclically to the injection molding or injection-compression cycle. During the injection phase, it is also appropriate, the
  • a particularly expedient modification of the method according to the invention is characterized in that a Difference ⁇ T2 i between the temperature T 2 of the kavticiansnahen wall portion and the temperature Ti of the kavticiansfernen
  • An even more preferred variant provides that a difference ⁇ i T2 between the temperature T 2 of the kavticiansnahen wall portion and the temperature Ti of the kavticiansfernen
  • Such a temperature difference has a particularly advantageous effect on the reduction of the sink marks of the finished moldings.
  • Resistance heating or inductively tempered particularly useful by means of liquid or gaseous media, such as oil, water or steam.
  • the principle of the invention can be transferred to the known injection molding and injection compression molding processes. However, its particularly advantageous effects come to light in the production of thick-walled molded articles made of plastic.
  • thermoplastics such as
  • Copolymers polymethyl methacrylimide or polyacrylates and methacrylates.
  • a particularly appropriate use relates to the production of PMMA moldings, most preferred are lenses for optical purposes.
  • FIG. 1 shows a cross section through an idealized and simplified representation of a tool with a
  • FIG. 2 shows a cross section through a partial view of an embodiment of a device according to the invention
  • FIG. 3 shows a diagram of the thickness distribution in relation to a cold frame
  • Figure 4 is a diagram of the thickness distribution with respect to a hot frame.
  • Tool plate In the figure 1 can be seen a cross-sectional view of a schematic diagram of a tool.
  • Reference numeral 3 denotes a mold for injection molding.
  • the tool 3 has in its interior a cavity 2.
  • Cavity 2 is also referred to as cavity 2. Furthermore, it is possible to see a wall area 1 close to the cavity and a wall cavity-distant body 5 of the tool. The edge region 1 is adjacent to the hollow space 2. From the cavity 2 to the outside
  • the plates 3a and 3b In the figure two can be seen as tool components, the plates 3a and 3b.
  • the cavity 2 In this two-platen tool, the cavity 2 is integrated in the plate 3a, while the plate 3b can be opened to demould a finished injection-molded part.
  • Cavity frame 1 is designed replaceable in the example shown and separately tempered. Furthermore, one recognizes in FIG. 2, the embossing punch 4, which can be used for compaction of the molding compound in the cavity.
  • Limitation of the cavity may also be formed separately tempered. However, this is not necessary to achieve the beneficial effects of the invention.

Abstract

L’invention concerne un dispositif et un procédé de fabrication de pièces moulées en plastique à paroi épaisse par moulage par injection ou injection-compression. Le dispositif comprend un outil de moulage par injection ou par injection-compression présentant une cavité et se caractérise en ce que l’outil comprend une zone de paroi adjacente à la cavité et un corps éloigné de la cavité adjacent à la zone de paroi proche de la cavité, le corps de l’outil étant conçu de manière à être réglé à une température T1 et la zone de paroi étant conçue de manière à être réglée à une température T2 différente de la température T1. Selon le procédé, on amène et maintient la température T2 de la zone de paroi de l’outil proche de la cavité avant et/ou pendant le processus d’injection à une valeur supérieure à la température de Vicat Tv de la matière à mouler en plastique, la température T2 étant supérieure à la température T1 du corps d’outil; et on amène la température T2 de la zone de paroi proche de la cavité, pendant la solidification de la matière à mouler en plastique et avant la déformation, à une température inférieure à la température de Vicat Tv de la matière à mouler en plastique. On obtient ainsi un corps moulé en plastique à paroi épaisse, tel que des lentilles optiques ou similaires, présentant une réduction des dépressions en surface.
EP10724351A 2009-07-13 2010-05-25 Dispositif et procédé de fabrication de pièces moulées en plastique à paroi épaisse présentant une réduction des dépressions en surface, par moulage par injection ou injection-compression Withdrawn EP2454070A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009027646A DE102009027646A1 (de) 2009-07-13 2009-07-13 Vorrichtung und Verfahren zur Herstellung dickwandiger Kunststoffformteile mit verringerten Einfallstellen durch Spritzgießen oder -prägen
PCT/EP2010/057097 WO2011006704A1 (fr) 2009-07-13 2010-05-25 Dispositif et procédé de fabrication de pièces moulées en plastique à paroi épaisse présentant une réduction des dépressions en surface, par moulage par injection ou injection-compression

Publications (1)

Publication Number Publication Date
EP2454070A1 true EP2454070A1 (fr) 2012-05-23

Family

ID=42984463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10724351A Withdrawn EP2454070A1 (fr) 2009-07-13 2010-05-25 Dispositif et procédé de fabrication de pièces moulées en plastique à paroi épaisse présentant une réduction des dépressions en surface, par moulage par injection ou injection-compression

Country Status (13)

Country Link
US (1) US20120171452A1 (fr)
EP (1) EP2454070A1 (fr)
JP (1) JP2012532777A (fr)
KR (1) KR20120038964A (fr)
CN (1) CN102470575A (fr)
BR (1) BR112012000957A2 (fr)
CA (1) CA2768052A1 (fr)
DE (1) DE102009027646A1 (fr)
MX (1) MX2012000633A (fr)
RU (1) RU2012104753A (fr)
SG (1) SG177652A1 (fr)
TW (1) TW201127605A (fr)
WO (1) WO2011006704A1 (fr)

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JP5756923B2 (ja) * 2012-06-18 2015-07-29 パナソニックＩｐマネジメント株式会社 射出成形方法および射出成形金型装置
AT513534A1 (de) * 2012-11-13 2014-05-15 Htp High Tech Plastics Gmbh Spritzgußformteil und Werkzeug sowie Verfahren zur Herstellung
EA030546B1 (ru) * 2014-06-20 2018-08-31 Дмитрий Владимирович Кравцов Способ получения толстостенных отливок из полимеров
WO2018116254A1 (fr) * 2016-12-22 2018-06-28 Modi Consulting And Investments Pty Ltd Processus de moulage ayant un refroidissement couplé à une force active
EP3470202B1 (fr) * 2017-10-12 2021-08-18 Essilor International Moulage par injection comportant un cycle de chauffage/refroidissement pour la fabrication d'articles optiques avec surface fresnel
EP3620288A1 (fr) * 2018-09-10 2020-03-11 Covestro Deutschland AG Surmoulage de feuille tempéré dynamique par injection
CN114675685B (zh) * 2022-03-16 2023-03-10 浙江凯华模具有限公司 一种移动式模具型腔预调温控制装置及方法
CN114571676B (zh) * 2022-03-22 2024-01-05 东风柳州汽车有限公司 一种模具及其防表面缩印的结构

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Also Published As

Publication number Publication date
SG177652A1 (en) 2012-02-28
KR20120038964A (ko) 2012-04-24
CA2768052A1 (fr) 2011-01-20
JP2012532777A (ja) 2012-12-20
WO2011006704A1 (fr) 2011-01-20
MX2012000633A (es) 2012-02-08
RU2012104753A (ru) 2013-08-20
DE102009027646A1 (de) 2011-01-20
TW201127605A (en) 2011-08-16
CN102470575A (zh) 2012-05-23
BR112012000957A2 (pt) 2016-03-15
US20120171452A1 (en) 2012-07-05

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