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WO2008041122A2 - Élément chauffant, en particulier pour canaux chauffés d'appareil de moulage par injection de matériaux plastiques - Google Patents

Élément chauffant, en particulier pour canaux chauffés d'appareil de moulage par injection de matériaux plastiques Download PDF

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Publication number
WO2008041122A2
WO2008041122A2 PCT/IB2007/002993 IB2007002993W WO2008041122A2 WO 2008041122 A2 WO2008041122 A2 WO 2008041122A2 IB 2007002993 W IB2007002993 W IB 2007002993W WO 2008041122 A2 WO2008041122 A2 WO 2008041122A2
Authority
WO
WIPO (PCT)
Prior art keywords
heating element
element according
plate
conductive material
hot runner
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.)
Ceased
Application number
PCT/IB2007/002993
Other languages
English (en)
Other versions
WO2008041122A3 (fr
Inventor
Gianfranco Cirri
Maria Prudenziati
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.)
Inglass SpA
Original Assignee
Inglass 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 Inglass SpA filed Critical Inglass SpA
Publication of WO2008041122A2 publication Critical patent/WO2008041122A2/fr
Publication of WO2008041122A3 publication Critical patent/WO2008041122A3/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2737—Heating or cooling means therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • H05B3/262—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base the insulating base being an insulated metal plate
    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2737—Heating or cooling means therefor
    • B29C2045/2743—Electrical heating element constructions
    • B29C2045/2745—Film-like electrical heaters
    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2737—Heating or cooling means therefor
    • B29C2045/2743—Electrical heating element constructions
    • B29C2045/2746—Multilayered electrical heaters
    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2737—Heating or cooling means therefor
    • B29C2045/275—Planar heating or cooling elements
    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2737—Heating or cooling means therefor
    • B29C2045/2751—Electrical power supply connections

Definitions

  • the present invention relates in general to apparatuses for injection moulding of plastic materials, and more in particular regards an innovative heating system, characterized by an improved method of application of the process described in the Italian patent application No. IT-A-TO2004A000253, dated April 23, 2003, and the U.S. patent application No. US-A-2005/0257367, dated November 24, 2005. State of the prior art
  • the heating element is constituted by a generally platelike body, fixed in contact of thermal transfer to a hot runner, the heating resistor extends throughout the length and width of the plate and is provided at its ends with electrical-connection means for electrical supply thereof.
  • the purpose of the present invention is to provide a heating element of the type defined above, whereof the heating resistor, which is able to operate at up to 600 0 C, is equipped with means of electrical connection having a conformation that is particularly simple and functional.
  • the aforesaid electrical-connection means include: a screw, which is inserted through a hole of the.heating plate and has a head sunk within the latter, being insulated therefrom by a purposely provided ceramic washer, and a threaded stem projecting from the aforesaid base layer in a position corresponding to a widened end contact pad of said path of electrically conductive material; a clamping assembly with nut and lock nut screwed on the threaded stem; and an annular terminal of a supply cable tightened with a nut and hence in electrical contact with said widened contact pad.
  • the invention moreover envisages a series of arrangements both as regards the configuration of the electrical-connection means and as regards the production of the heating plate as a whole, as defined in the subordinate claims.
  • FIG. 1 is a schematic perspective view of a heating plate according to the invention, applied to a hot runner of an apparatus for injection moulding of plastic materials;
  • FIG. 2 is a more detailed representation of a detail of Figure 1 ;
  • FIG. 3 is a vertical cross-sectional view, at a larger scale, of Figure 2.
  • H designated as a whole by H is an hot-runner element for apparatuses for injection moulding of plastic materials, the shape and configuration of which is represented purely by way of example.
  • a heating plate (1) made of a body of thermally conductive material.
  • Said material may be the same as the one forming the hot runner H (typically stainless steel), or else a different metal (such as aluminium, bronze, copper, etc.) or a metal alloy.
  • the surface of the plate (1) opposite to the hot runner H, designated by (2) is coated with a base layer of electrically insulating and thermally conductive material, typically alumina or zirconia, having a thickness of approximately 100 ⁇ m.
  • Said electrically insulating layer (2) is conveniently applied on the surface of the plate (1), previously roughened, for example by means of sand-blasting, and then subjected to a process of chemical nickel-plating, which prevents phenomena of corrosion, or else by machining and then subjected to a process of galvanic nickel-plating by means of spraying techniques, such as plasma spray, high- velocity oxy-fuel spray, focused cold spray, and the like.
  • the material of which the plate (1) is made will conveniently be a metal or metal alloy having a coefficient of thermal expansion compatible with that of the electrically insulating base layer (2) and of the subsequent layers.
  • at least one electrical heating resistor made up of a path (3) of electrically conductive material having a high coefficient of variation of resistance with temperature, e.g., nickel.
  • the electrical resistor defined by the path (3) is also conveniently applied by means of spraying techniques by setting on the previously formed base layer (2) an appropriate mask provided with at least one through slot that reproduces the path (3) or by means of other equivalent methods.
  • the electrically conductive material thus spayed is typically Ni, Fe-Ni, Ni- Cr, TiOx, Monel, or equivalents.
  • the corresponding thickness may, for example, be in the region of 50 ⁇ m.
  • the base layer (2) and the path (3) that defines the electrical heating resistor will be conveniently coated with a second insulating layer, typically of alumina or zirconia, also applied by means of the same spraying techniques.
  • the second layer of insulating material may have a thickness of approximately 100 ⁇ m.
  • the second layer of electrically insulating but intrinsically porous material will be coated with a dielectric material, for example, a vitreous paste deposited by serigraphy and then remolten at a temperature of higher than 500°C.
  • a further layer for example, consisting of an anti-emissive gold flash.
  • the path that defines the electrical heating resistor (3) is then incorporated between two layers of electrically insulating material, and in use, electrical supply thereof produces heating of the plate (1) and hence, by conduction, heating of the hot runner H on which the plate (1) is fixed.
  • the surface of the plate (1) in contact with the hot runner H may be coated with a thin layer of gold plating, or else between the plate (1) and the hot runner H there may be set a thin copper lamina, annealed and pickled, having a thickness in the region of 100 ⁇ m.
  • Fixing of the heating plate (1) to the hot runner H may be obtained in a rigid way, for example by means of screws (6), made of the same material as that of the chambers, or else by means of elastic elements (20), such as springs or Belleville washers, etc., designed not only to enable recovery of the various thermal expansions, but also to enable relative movements thereof, in the case where they are made of different material.
  • each electrical-connection terminal (5) of the electrical heating resistor (3) includes a screw (7) made of the same material as the plate and nickel-plated, inserted through a through hole (8) of the plate (1) and having a tightening head (9) sunken within a recess (10) of said plate (1), formed by the part in contact with the hot runner H.
  • Set between the head (9) of the screw (7) and the plate (1) is an insulating washer (11), made of ceramic material (macor, steatite, etc.) and of dimensions such as to prevent any contact of the aforesaid screw with the plate.
  • the threaded stem of the screw (7) projects from the base layer (2) through the end contact pad (4) of the path (3) and carries a clamping assembly made up of a nut (13a), tightened against the contact pad (4) with the interposition of a metal washer (typically made of gold-plated copper) (14), and by a lock nut 13. Gripped between the lock nut (13) and the nut (15), with interposition of a pair of washers (16) and (17), is an annular terminal (18) of an electrical supply cable (19).
  • the screw could have or could grip an electrical termination of a fast-attachment type, such as Fastin-Faston.

Landscapes

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

Abstract

L'invention concerne un élément chauffant pour appareils de moulage par injection de matériaux plastiques, comprenant une plaque (1) en un matériau thermoconducteur, et caractérisé par un traitement amélioré de préparation de la surface de la plaque, en vue de la neutralisation des phénomènes de corrosion. Ladite plaque présente un système de chauffage intégré (basé sur la demande de brevet Italien No IT-A-TO2004A000253 et la demande de brevet U.S. No US-A-2005/0257367), de manière à rendre l'élément chauffant capable de fonctionner à des températures atteignant 600°C, avec glaçage éventuel pour sceller la couche finale isolante d'Al2O3 et mince revêtement d'or final anti-émissif. L'élément chauffant présente également des connexions électriques qui sont fiables aux températures élevées, ainsi que des systèmes de fixation à un canal chauffé (H), également dans le cas où les matériaux de base de la plaque et du canal chauffé sont différents.
PCT/IB2007/002993 2006-10-05 2007-10-04 Élément chauffant, en particulier pour canaux chauffés d'appareil de moulage par injection de matériaux plastiques Ceased WO2008041122A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMO2006A000314 2006-10-05
ITMO20060314 ITMO20060314A1 (it) 2006-10-05 2006-10-05 Elemento riscaldante innovativo, in particolare per camere calde di apparecchiature di stampaggio ad iniezione di materie plastiche

Publications (2)

Publication Number Publication Date
WO2008041122A2 true WO2008041122A2 (fr) 2008-04-10
WO2008041122A3 WO2008041122A3 (fr) 2008-07-03

Family

ID=39268857

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/002993 Ceased WO2008041122A2 (fr) 2006-10-05 2007-10-04 Élément chauffant, en particulier pour canaux chauffés d'appareil de moulage par injection de matériaux plastiques

Country Status (2)

Country Link
IT (1) ITMO20060314A1 (fr)
WO (1) WO2008041122A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20090026A1 (it) * 2009-02-04 2010-08-05 Maria Prudenziati Elemento riscaldante innovativo, in particolare per stampi e camere calde di apparecchiature di stampaggio ad iniezione di materie plastiche in spessori sottili
ITMO20090085A1 (it) * 2009-04-07 2010-10-08 Maria Prudenziati Sorgente di radiazione infrarossa, a risposta rapida ed elevatissima efficienza
WO2013152976A3 (fr) * 2012-04-11 2014-01-30 Günther Heisskanaltechnik Gmbh Empreinte rapportée à couche de chauffe, plaque de moule pourvue d'une telle empreinte rapportée et procédé permettant de faire fonctionner une telle empreinte rapportée
DE102012010198B4 (de) * 2011-06-15 2017-09-28 Shin-Etsu Chemical Co., Ltd. Keramische heizvorrichtung und herstellverfahren
IT201900022794A1 (it) * 2019-12-03 2021-06-03 Giuseppe Campari Tampone di rinvenimento lamiera

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US662003A (en) * 1900-06-09 1900-11-20 Alfred Lamm Washer.
DE19941038A1 (de) * 1999-08-28 2001-03-01 Guenther Heiskanaltechnik Gmbh Elektrische Heizung für Heißkanalsysteme und Verfahren zur Herstellung einer solchen Heizung
US7241131B1 (en) * 2000-06-19 2007-07-10 Husky Injection Molding Systems Ltd. Thick film heater apparatus
DE10252389A1 (de) * 2002-11-12 2004-05-27 Watlow Gmbh Heizelement
ITTO20040253A1 (it) * 2004-04-23 2004-07-23 Incos Spa Procedimento per la produzione di un componente per apparecchiature di stampaggio ad iniezione

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20090026A1 (it) * 2009-02-04 2010-08-05 Maria Prudenziati Elemento riscaldante innovativo, in particolare per stampi e camere calde di apparecchiature di stampaggio ad iniezione di materie plastiche in spessori sottili
ITMO20090085A1 (it) * 2009-04-07 2010-10-08 Maria Prudenziati Sorgente di radiazione infrarossa, a risposta rapida ed elevatissima efficienza
DE102012010198B4 (de) * 2011-06-15 2017-09-28 Shin-Etsu Chemical Co., Ltd. Keramische heizvorrichtung und herstellverfahren
WO2013152976A3 (fr) * 2012-04-11 2014-01-30 Günther Heisskanaltechnik Gmbh Empreinte rapportée à couche de chauffe, plaque de moule pourvue d'une telle empreinte rapportée et procédé permettant de faire fonctionner une telle empreinte rapportée
IT201900022794A1 (it) * 2019-12-03 2021-06-03 Giuseppe Campari Tampone di rinvenimento lamiera

Also Published As

Publication number Publication date
ITMO20060314A1 (it) 2008-04-06
WO2008041122A3 (fr) 2008-07-03

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