EP0054548A1 - Assemblage de modules de chauffage pour un appareil de fusion et de distribution d'un materiau thermoplastique - Google Patents

Assemblage de modules de chauffage pour un appareil de fusion et de distribution d'un materiau thermoplastique

Info

Publication number
EP0054548A1
EP0054548A1 EP81900697A EP81900697A EP0054548A1 EP 0054548 A1 EP0054548 A1 EP 0054548A1 EP 81900697 A EP81900697 A EP 81900697A EP 81900697 A EP81900697 A EP 81900697A EP 0054548 A1 EP0054548 A1 EP 0054548A1
Authority
EP
European Patent Office
Prior art keywords
fins
thermoplastic material
melting
recess
heater
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Withdrawn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
EP81900697A
Other languages
German (de)
English (en)
Other versions
EP0054548A4 (fr
Inventor
Donald R. Mercer
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.)
Mercer Corp
Original Assignee
Mercer Corp
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 Mercer Corp filed Critical Mercer Corp
Publication of EP0054548A1 publication Critical patent/EP0054548A1/fr
Publication of EP0054548A4 publication Critical patent/EP0054548A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/022—Melting the material to be shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details specially adapted for crucible or pot furnaces
    • F27B14/0806—Charging or discharging devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details specially adapted for crucible or pot furnaces
    • F27B2014/0887—Movement of the melt
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • F27D2099/0008—Resistor heating

Definitions

  • This invention relates to apparatus for the melting and dispensing of thermoplastic material, and more particularly to a heater module structure for such apparatus.
  • each, heater module made in accordance with this invention includes an elongated body made of thermally conductive material, including an elongated core having longitudinally spaced first fins projecting from one side of said, core and longitudinally spaced second fins projecting from the opposite side of , said core, the second fins being longitudinally staggered relative to the first fins.
  • each first fin of the second module spans the corresponding space between each adjacent pair of second fins of the first module to close all vertical spaces between the adjacent first and second fins and to provide longitudinally staggered vertical holes for the fluid passage of the melted thermplastic material.
  • an entire grid surface may be built up to form a complete heating stage for rapidly melting the thermoplastic material.
  • an assembly of the above heater modules may be utilized in each stage of the melting apparatus by mounting each, assembled stage within a hopper-type housing having a cross-section of the same shape as, but siightly larger than, the cross-section of the assembled stages.
  • Conventional thermoplastic dispensing elements such as a dispensing head and hose, may be incorporated below the various stages assembled fuom the heater modules, for dispensing the melted thermoplastic material.
  • various sizes of heating or grid stages may be constructed, with one or more vertically arranged stages, with a minimum of assembly time and materials.
  • FIG. 1 is a front elevation of an apparatus for melting and dispensing thermoplastic material, incorporating the heater modules made in accordance with this invention, and with parts broken away and shown in sections;
  • FIG. 2 is a section taken along the line 2-2 of FIG. 1;
  • FIG. 3 is a section taken along the line 3-3 of FIG. 1;
  • FIG. 4 is an enlarged fragmentary section taken along the line 4-4 of FIG. 3;
  • FIG. 5 is a fragmentary section taken along the line 5-5 of FIG. 4;
  • FIG. 6 is a fragmentary top perspective view of a plurality of heater modules assembled in a pre-melting stage. Best Mode For Carrying Out The Invention
  • the apparatus for melting and dispensing thermoplastic material, or "hot melt applicator,” 10 has a base or base plate 11 upon which is supported a conduit block 12 in fluid communication with the bottom wall 13 of a hopper-type housing or heater receptacle 14.
  • a hopper 15 for receiving the thermoplastic material 16 in its solid form.
  • a protective casing or jacket 18 may enclose, and be spaced from, the outer surface of the heating receptacle. As shown, the hopper 15 is integral with the jacket 18.
  • a gear pump 20 is driven by motor 21 through sprocket-chain transmission 22 and the driven shaft 23 to move the molten thermoplastic material 24 through the conduit block 12 into the heated dispensing head 25.
  • Hose 26 conveys the hot thermoplastic material 24 from the dispensing head 25, preferably through a nozzle 27, to a point of discharge.
  • the controls for the apparatus 10 are mounted in the control housing 29 on the outside of the jacket 18.
  • a plurality of heater modules 30, made in accordance with this invention, are assembled within the heating receptacle 14 to provide an upper, or pre-melt, stage 31 and a lower, melting, or progressive melting stage 32.
  • Each module 30 includes an elongated body 34 of thermally conductive material.
  • Each elongated body 34 includes an elongated substantially rectangular core 35 of substantial height or depth having a plurality of first and second fins 36 and 37 projecting from opposite sides of the core 35.
  • Each of the first and second fins 36 and 37 is a substantially uniform, rectangular cross-section.
  • the first fins 36 and the second fins 37 are uniformly longitudinally spaced apart to form recesses 38 and 39, respectively, of uniform longitudinal dimensions equal to the longitudinal dimension of each of the fins 36 and 37.
  • the second fins 37 are longitudinally staggered relative to the first fins 36 so that a fin 37 is in lateral alignment with a first recess 38, while each first fin 36 is in lateral alignment with a corresponding second recess
  • a heating stage is built up by assembly of a plurality of modules 30 longitudinally parallel and adjacent to each other, with the first fins 36 of the second module 30' (FIG. 6) opposite and aligned with a second recess 39 in the first module 30, such that the lateral outer vertical face of the fin 36 closes the recess 39.
  • the outer vertical face of each fin 37 closes an opposing recess 38.
  • the closed recesses 38 and 39 form longitudinally staggered vertical holes, each hole having a rectangular cross-section, completely enclosed laterally and longitudinally, but vertically open to pro vide a fluid passage for the molten thermoplastic material 24.
  • Each module body 34 is heated by a plurality of heating elements 40, such as cartridges or calrod elements received in heating element holes 41 formed in the core 34.
  • One or more of the modules 30, 30' may be provided with a well 42 in its core 34 for receiving a thermal sensing element 43.
  • the heating elements 40 may be connected by electrical leads or wires 44 through an electrical conduit 45 to a heater control device 46.
  • the upper portion of the core 34 may be relieved to form a chamber 47, the upper portion of which may be closed by a cap 48, secured by screws 46.
  • Each group of parallel modules 30. in each stage 31 and 32 may be held in assembled position by the ganging bars 50 at each end of the module 30.
  • the ganging bars 50 may be connected together by the vertical connecting bars 41 and suspended from the upper edge of the hopper 15 by the hanger bars 52.
  • the method of supporting the assembled modules 30 by the hanger bars 52 prevents any fastener members from penetrating the walls of the heater receptacle 14, to eliminate leakage of the very hot molten thermoplastic material 24.
  • the thermal sensing elements 43 for each heating stage 31 and 32 are connected to separate and independent the ⁇ nostatic controls, so that the pre-melt stage 31 may be heated to and maintained at a lower temperature than the progressive melt or melting stage 32, as described in the prior U.S. Mercer patent 3,531,023.
  • each longitudinal body 34 is made of a monolithic, thermally conductive material, including the core 34 and the fins 36 and 37.
  • the module construction 30 and 30' provides substantial exterior heat transfer surface by virtue of a plurality of longitudinally spaced vertical fins 36 and 37 projecting from opposite sides of the core 34.
  • thermoplastic melting devices and apparatus may be easily and very quickly and economically assembled, regardless of the number of vertical stages required, and regardless of the transverse size and capacity of the apparatus desired.
  • top walls 56 and 57 of the respective fins 36 and 37 are sloped, so that they decline laterally from the core 34 to facilitate drainage of the molten thermoplastic material 24 downward into, the corresponding vertical holes 38 and 39, to prevent unwanted accumulation of the thermoplastic material on top of the modules 30 and 30'. It is also within the scope of this invention to provide horizontal holes in the core 34 to receive heating elements, such as heating elements 40, longitudinally horizontally within the core 34.
  • the monolithic thermally conductive material incorporated in each of the modules may be of an aluminum alloy, such as aluminum alloy No. 202413 or aluminum alloy 6061T6.
  • a pre-melt stage 31 or progressive melting stage 32 has been designed which affords a greater ratio of heating surface to the opening areas for the thermoplastic material, thereby reducing the melting time and increasing the flew velocity of the thermoplastic material 24 through the respective melting stages 31 and 32, respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Coating Apparatus (AREA)

Abstract

Les appareils de fusion de distribution d'un materiau thermoplastique de l'art anterieur ont de faibles vitesses de fusion et d'ecoulement du materiau thermoplastique. Un module de chauffage est adapte pour etre utilise dans un appareil de fusion et de distribution d'un materiau thermoplastique (24) avec d'autres modules similaires de formation d'un prefondant et/ou un etage de fusion (31, 32) de chauffage du materiau thermoplastique (24). Chaque module a une construction uniforme et comprend un noyau allonge (35) ayant une pluralite de premieres ailettes espacees longitudinalement (36) se projetant depuis un cote du noyau (35) et des secondes ailettes (37) se projetant depuis l'autre cote du noyau (35), mais placees en quinconce de maniere uniforme et longitudinalement par rapport aux premieres ailettes (36), de telle sorte qu'en placant une pluralite de modules paralleles adjacents entre eux les evidements (38, 39) definis entre les ailettes adjacentes (36, 37) sont fermes par les ailettes opposees (37, 36) pour former des trous verticaux longitudinaux en quinconce pour le passage de l'ecoulement du materiau thermoplastique fondu (24). Les trous verticaux en quinconce dans les modules de chauffage ont un rapport surfaces de chauffage/section d'ouverture augmente ce qui a pour consequence de reduire le temps de fusion et augmenter la vitesse d'ecoulement du materiau thermoplastique.
EP19810900697 1980-06-30 1980-06-30 Assemblage de modules de chauffage pour un appareil de fusion et de distribution d'un materiau thermoplastique. Withdrawn EP0054548A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1980/000825 WO1982000193A1 (fr) 1980-06-30 1980-06-30 Assemblage de modules de chauffage pour un appareil de fusion et de distribution d'un materiau thermoplastique

Publications (2)

Publication Number Publication Date
EP0054548A1 true EP0054548A1 (fr) 1982-06-30
EP0054548A4 EP0054548A4 (fr) 1985-04-11

Family

ID=22154417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810900697 Withdrawn EP0054548A4 (fr) 1980-06-30 1980-06-30 Assemblage de modules de chauffage pour un appareil de fusion et de distribution d'un materiau thermoplastique.

Country Status (4)

Country Link
EP (1) EP0054548A4 (fr)
JP (1) JPS57500914A (fr)
AU (1) AU6927581A (fr)
WO (1) WO1982000193A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0771920B2 (ja) * 1988-04-25 1995-08-02 株式会社東海理化電機製作所 支持高さ可変式ウエビング支持装置
US5706982A (en) * 1995-10-30 1998-01-13 Nordson Corporation Molten thermoplastic material supply system with distribution manifold having reverse flush filter and automatic drain
US11619449B2 (en) * 2019-10-24 2023-04-04 Waterblasting, Llc Melting kettle

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2916262A (en) * 1959-12-08 flores
US1662870A (en) * 1924-10-09 1928-03-20 Stancliffe Engineering Corp Grooved-plate heat interchanger
US2809772A (en) * 1955-05-02 1957-10-15 Kamborian Jacob S Apparatus for melting and dispensing thermoplastic adhesive
US3217793A (en) * 1962-11-30 1965-11-16 Wakefield Eng Inc Heat transfer
US3377466A (en) * 1965-04-05 1968-04-09 United Shoe Machinery Corp Apparatus for handling thermoplastic material
US3352279A (en) * 1965-09-15 1967-11-14 Lockwood Tech Adhesive applicator
US3396458A (en) * 1966-03-28 1968-08-13 Electro Therm Electrical heating elements and method and apparatus for making the same
US3531023A (en) * 1968-04-30 1970-09-29 Mercer Corp Process and apparatus for melting and dispensing thermoplastic material
US3632987A (en) * 1970-02-20 1972-01-04 Harley J Orr Heating and radiating unit for electrical heaters
US3792801A (en) * 1971-10-29 1974-02-19 Nordson Corp Thermoplastic applicator with self-cleaning supply reservoir
US3964645A (en) * 1975-02-12 1976-06-22 Nordson Corporation Apparatus for melting and dispensing thermoplastic material
US4009974A (en) * 1975-02-12 1977-03-01 Nordson Corporation Method and apparatus for pumping viscous material

Also Published As

Publication number Publication date
JPS57500914A (fr) 1982-05-27
WO1982000193A1 (fr) 1982-01-21
EP0054548A4 (fr) 1985-04-11
AU6927581A (en) 1982-02-02

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Legal Events

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Effective date: 19841231

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Inventor name: MERCER, DONALD R.