US3564198A - Heating element - Google Patents

Heating element Download PDF

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Publication number
US3564198A
US3564198A US776104A US3564198DA US3564198A US 3564198 A US3564198 A US 3564198A US 776104 A US776104 A US 776104A US 3564198D A US3564198D A US 3564198DA US 3564198 A US3564198 A US 3564198A
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US
United States
Prior art keywords
elements
heating
heating module
wall
terminals
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.)
Expired - Lifetime
Application number
US776104A
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English (en)
Inventor
John Tiverton Watson
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.)
Molins Machine Co Ltd
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Molins Machine Co Ltd
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 Molins Machine Co Ltd filed Critical Molins Machine Co Ltd
Application granted granted Critical
Publication of US3564198A publication Critical patent/US3564198A/en
Anticipated expiration legal-status Critical
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Classifications

    • 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

Definitions

  • a heating element comprises a member of low specific heat material, providing a heating surface flanked by HEATING ELEMENT This invention relates toheating elements more'especially a heating element for use with high speed machinery.
  • a further difficulty experienced has been the necessity in some instances to have a heating element oflow mass, i. e. low mechanical inertia.
  • the importance of this latter characteristic can be realized in relation to high speed reciprocation or oscillation of the thermal element in and out of a sealing position.
  • a heating element comprisingan elongated member formed from a material having low specific heat, said member having a substantially planar heating surface carrying on two opposed edges a pair of flanges forming parallel sidewalls, and said member being provided at its ends with electrical connections to enable an electric current to be passed through said member.
  • said elongated member is a tube of substantially rectangular section, one wall of said tube providing the heating surface, and portions are removed from the ends of the wall of such tube which is parallel to the wall providing the heating surface to allow clearance for connection of terminals for a current supply to said one wall; preferably such terminals are welded to the ends of the wall providing the heating surface.
  • the invention further provides aheating module which comprises a plurality of the aforesaid heating elements connected together with their sidewalls parallel so as to present a continuous heating surface.
  • the elements are cemented together with a resin which is electrically an insulator.
  • the heating elements are linked together by end plates which provide both electrical and mechanical connections between the elements, and terminals provided for connection to a current supply.
  • the elements should be connected electrically in series asthis tends to vgive the heating surface a uniform temperature distribution.
  • the module is rigid yet has low mass.
  • the individual elements have low resistances (e.g. of the order of 0.05 ohm) and thus resistances. at the joins between adjacent elements are a factor to be considered in designing a module; with electrically parallel connection of the elements differing joint resistances tend to cause an irregular temperature distribution across the heating surfaces due to unequal current sharing between elements. Whilst therefore, it is possible to join the elements electrically in parallel connection, it is not a preferred arrangement owing to the practical difficulty of matching all the joint resistances with sufficient accuracy. It
  • the geometry of the module can be varied e.g. to have a substantially circular heating surface.
  • a heating module for use with a suction chamber which comprises heating elements as hereinbefore described arranged with their sidewalls parallel and their heating surfaces coplanar so as to provide suction apertures between the sidewalls of adjacent heating elements.
  • modules hereinbefore described can be used to advantage as components in g high speed machinery since they are characterized by low mass and low thermal capacity. Temperature response to incremental changes in current applied will be rapid, and can also be directly related to the speed of machine operation.
  • the temperature control for the elements e.g. a rheostat
  • the control governing the operating speed of the machine can be ganged together with the control governing the operating speed of the machine.
  • a substantially rectangular section tube is preferred for the heating elements, since it s gives rigidity to the element.
  • FIG. 1 shows a view of a heating module looking in' to the heating surface
  • FIG. 2 shows an end view of the heating module of FIG. 1 as indicated by arrow II in'that FlG.;
  • FIG. 3 shows a sectional view taken on the line 111-111 of FIG. 1;
  • FIG. 4 shows a plan view of a heating module provided with suction apertures
  • FlG.'5 shows an end view as indicated by arrow V in FIG. 4;
  • FIG. 6 shows a section on the line Vl-Vl of FIG. 4;
  • FIG. 7 shows a sectional view of a heating module as shown in FIG. 4mounted on a suction chamber.
  • FIG. 1 there is shown a plan view of a heating module, which comprises five similar heating elements a, b, c, d, e electrically linked together in series connection by connecting plates 1 to 4 with provision for electrical supply connections to be made at input terminals 5 and 6 respectively.
  • the heating elements a to e are cemented together in geometrically parallel relation with a resin film r which provides a mechanical link and electrical insulation between the elements. Individual elements are all mutually similar, and by way of illustration the element designated 2 will be described.
  • the element e is tubular with a substantially rectangular cross section (FIG. 3). Element e is provided at either end with cutaway portions of its top wall (i.e.
  • the lower surfaces of the elements are also mutually similar and, as shown for e are substantially flat surfaces smoothat their edges (i.e. radiused to avoid a sharp edge capable of damaging articles to which the module may be applied).
  • the lower surfaces of the elements a to e are aligned so as to form a substantially planar surface to be presented as a heating face.
  • This module comprises four similar elements f, g, h, i, mounted with their sidewalls vl6 parallel and their heating surfaces 17 coplanar, and electrical connections similar to those of the module of FIGS. 1 3.
  • the elements are spaced apart by suction apertures s which, when the module is mounted on a suction chamber (as shown in FIG. 7), lead via ports pin a masking plate M into the suction chamber G.
  • FIG. 7 shows a suction chamber housing H which is a rotary member, having chamber G therein.
  • the chamber G is masked by masking plate M having inlet ports p leading to the suction apertures s between the heating elements f; g, h, i.
  • the elements are coupled electrically in series by plates 11, 7
  • thermo-couple junctions may be 1 example will be described.
  • a machine for sealing cigarette 3 1 packs with a label it has been usual to carry the label through a secured to the inner face of the wall of one of the elements providing the heating surface.
  • a heating element comprising an elongated tube of sub stantially rectangular cross section, said tube being formed from a material having low specific heat, one wall of said tube constituting a substantially planar heating surface, and terminals attached to the ends of said one wall to enable an electric current to be passed there through, in which portions are removed from the ends of the wall of said tube parallel to said one wall constituting the heating surface to allow clearance for said terminals provided onsaid one wall, said terminals extending through and beyond the spaceleft vacant by removal of said portions.
  • a heating module comprising a plurality of elements as claimed in claim I, and means for connecting said elements together with their sidewalls parallel whereby the one walls of said plurality of elements present a substantially continuous heating surface.
  • a conveyor for heating articles while being conveyed comprising a transport member, a heating module as claimed in claim 6 mounted on said transport member, inlet ports in said transport member communicating with said apertures between the side walls of adjacent elements, and'suction means for drawing a vacuum through said inlet ports and apertures for retaining articles on said heatingsurface.
  • a conveyor as claimed in claim 8 further comprising a suction chamber in said rotary member, a masking plate thereover and suction means connected to said suction chamber, said masking plate containing said inlet ports and said heating module being mounted on said making plate

Landscapes

  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Surface Heating Bodies (AREA)
  • Package Closures (AREA)
  • Air-Conditioning For Vehicles (AREA)
US776104A 1967-11-17 1968-11-15 Heating element Expired - Lifetime US3564198A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5251667 1967-11-17

Publications (1)

Publication Number Publication Date
US3564198A true US3564198A (en) 1971-02-16

Family

ID=10464216

Family Applications (1)

Application Number Title Priority Date Filing Date
US776104A Expired - Lifetime US3564198A (en) 1967-11-17 1968-11-15 Heating element

Country Status (6)

Country Link
US (1) US3564198A (enrdf_load_stackoverflow)
JP (1) JPS4931034B1 (enrdf_load_stackoverflow)
BR (1) BR6804037D0 (enrdf_load_stackoverflow)
DE (1) DE1809384B2 (enrdf_load_stackoverflow)
FR (1) FR1591875A (enrdf_load_stackoverflow)
GB (1) GB1250454A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007076133A3 (en) * 2005-12-27 2008-07-10 Shanklin Corp Improved hot wire control apparatus and method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1949450A (en) * 1933-03-22 1934-03-06 Howard S Brown Low voltage heating element
GB535157A (en) * 1940-02-08 1941-03-31 Chance Brothers & Co Ltd Improvements relating to electrical resistances
FR975038A (fr) * 1948-09-21 1951-02-28 Chalot Ets élément chauffant pour appareils de chauffage électrique et ses applications
US2552259A (en) * 1948-10-12 1951-05-08 William F Stahl Electrical heating element
US2621704A (en) * 1950-02-11 1952-12-16 Langer Nicholas Heat sealing device
CH412133A (de) * 1963-01-11 1966-04-30 Sig Schweiz Industrieges Durch Impulsströme zu beheizender Heizkörper
US3283126A (en) * 1963-12-10 1966-11-01 Du Pont Electric strip heater
DK63682A (da) * 1981-02-14 1982-08-15 Bayer Ag Benzylpyrimidinylalkylethere og deres syreadditionssalte og metalsaltkomplekser,fremgangsmaade og mellemprodukt til deres fremstilling og deres anvendelse

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1949450A (en) * 1933-03-22 1934-03-06 Howard S Brown Low voltage heating element
GB535157A (en) * 1940-02-08 1941-03-31 Chance Brothers & Co Ltd Improvements relating to electrical resistances
FR975038A (fr) * 1948-09-21 1951-02-28 Chalot Ets élément chauffant pour appareils de chauffage électrique et ses applications
US2552259A (en) * 1948-10-12 1951-05-08 William F Stahl Electrical heating element
US2621704A (en) * 1950-02-11 1952-12-16 Langer Nicholas Heat sealing device
CH412133A (de) * 1963-01-11 1966-04-30 Sig Schweiz Industrieges Durch Impulsströme zu beheizender Heizkörper
US3283126A (en) * 1963-12-10 1966-11-01 Du Pont Electric strip heater
DK63682A (da) * 1981-02-14 1982-08-15 Bayer Ag Benzylpyrimidinylalkylethere og deres syreadditionssalte og metalsaltkomplekser,fremgangsmaade og mellemprodukt til deres fremstilling og deres anvendelse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007076133A3 (en) * 2005-12-27 2008-07-10 Shanklin Corp Improved hot wire control apparatus and method

Also Published As

Publication number Publication date
JPS4931034B1 (enrdf_load_stackoverflow) 1974-08-17
DE1809384A1 (de) 1969-06-04
BR6804037D0 (pt) 1973-01-25
FR1591875A (enrdf_load_stackoverflow) 1970-05-04
GB1250454A (enrdf_load_stackoverflow) 1971-10-20
DE1809384B2 (de) 1976-04-22

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