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WO1997018504A1 - Procede et appareil de commande de temperature - Google Patents

Procede et appareil de commande de temperature Download PDF

Info

Publication number
WO1997018504A1
WO1997018504A1 PCT/SE1996/001394 SE9601394W WO9718504A1 WO 1997018504 A1 WO1997018504 A1 WO 1997018504A1 SE 9601394 W SE9601394 W SE 9601394W WO 9718504 A1 WO9718504 A1 WO 9718504A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
sealing
temperature
heating strips
heat
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/SE1996/001394
Other languages
English (en)
Inventor
Claes Ingvert
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.)
Tetra Laval Holdings and Finance SA
Original Assignee
Tetra Laval Holdings and Finance SA
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 Tetra Laval Holdings and Finance SA filed Critical Tetra Laval Holdings and Finance SA
Priority to BR9606707A priority Critical patent/BR9606707A/pt
Priority to JP9518775A priority patent/JPH10512989A/ja
Priority to AU76585/96A priority patent/AU7658596A/en
Priority to EP96939394A priority patent/EP0804755A1/fr
Publication of WO1997018504A1 publication Critical patent/WO1997018504A1/fr
Priority to EA199700109A priority patent/EA199700109A1/ru
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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/224—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a resistive ribbon, a resistive band or a resistive strip
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8182—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects
    • B29C66/81821—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects of the welding jaws
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8187—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects
    • B29C66/81871—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects of the welding jaws
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9131—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux
    • B29C66/91311—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating
    • B29C66/91313—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating by measuring the voltage, i.e. the electric potential difference or electric tension
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91653—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the voltage, i.e. the electric potential difference or electric tension
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • G05D23/2401—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor using a heating element as a sensing element
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/38—Impulse heating
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/959—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables
    • B29C66/9592—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables in explicit relation to another variable, e.g. X-Y diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B2051/105—Heat seal temperature control

Definitions

  • the present invention relates to a method of monitoring and controlling the temperature of heat-generating devices which are supplied with electric current and are cyclically caused to generate thermal energy in connection with the execution of a work process, for example sealing by surface fusion of thermoplastic coatings preferably in the production of packages, these devices displaying one or more electrically conductive resistor elements of temperature-dependent resistor material, preferably in the form of heating strips, and the heat-generating current supply to the resistor elements during each work cycle is split into current pulses whose pulse length is controlled by a controllable current switch device.
  • heat-sealing jaws i.e. pairwise movable devices between which the packaging material surfaces intended for sealing are accommodated and compressed together.
  • heat emitting elements which supply sufficient sealing heat for the thermoplastic surfaces pressed against one another to fuse together for the formation of a tight and mechanically durable seal.
  • a solution to this problem is provided by the present invention which is characterized in that, during the pulse gap between the above-mentioned current pulses through the previously mentioned metallic elements, measurement current pulses are generated of constant and known current strength, these measurement current pulses giving rise to a voltage across the resistor elements, the voltage, or a potential value related to this voltage, constituting a relative measurement of the temperature of the resistor elements, the above mentioned voltage or potential value being compared with a preset norm potential value, and the potential difference between the norm value and the sensed value being caused to control drive means for the above-mentioned controllable current switch device in such a manner that the above-mentioned current pulse lengths are increased or reduced, respectively, in response to the outcome of the comparison between the preset norm value and the ascertained voltage drop across the resistor elements caused
  • the technical problem is per se previously known and has caused major difficulties, and the solution which has previously been employed was to individually adjust the sealing jaws so that, to the greatest possible extent, they are equal or, in usual parlance, that they "match one another".
  • the heat-generating and heat- emitting devices of the sealing jaws consist of thin strips of electric resistor material which are disposed on an insulating substrate which, in turn, is disposed on a steel rail.
  • the difficulty in causing these sealing jaws to be absolutely alike in thermal terms resides in the fact that the heating strips are not entirely uniform in thickness, width, length etc., and that the thermal insulation against the substrate may differ between the various sealing jaws, which entails uncontrolled thermal dissipation.
  • a further factor is that the sealing jaw strips become worn with time, with the result that their thermal properties, i.e. the heat they generate become different.
  • the solution to the problem proposed in the present invention entails that the temperature of the heating strips is controlled by means of a regulator while the engagement time of the sealing jaws against the sealing substrate is controlled using known and preferably mechanical means.
  • the method according to the present invention takes as its point of departure monitoring the heating strips of the sealing jaws so that they always have the same (adjustable) temperature and, by such means, controlling the quantity of heat supplied and the sealing result. Should, hence, the sealing result not be that desired, the temperature of the heating strips is adjusted until the desired sealing result is attained. If several sealing jaws are employed, the temperature of the sealing strips in the different sealing jaws may automatically be adjusted to the same level irrespective of whether the heating strips are worn or whether the sealing jaws displays different electric and thermal properties.
  • the present invention need not be applied solely for regulating the temperature in sealing jaws, but there is also a technical need in the art to be able to measure and register the temperature in, for example, filaments and thermal elements which are supplied with electric current.
  • the reason for the need to be able to measure and register the temperature in, for example, filaments, thermal elements and heating strips is that the temperature gives a diagnostic indication of the condition of the heat- generating device.
  • the service life of heating strips or heating elements is greatly influenced by an excessively high temperature, which is not the case in, for example, the filaments in light bulbs, for which reason there is a need in the art to be able continuously to monitor the temperature in heating strips and filaments in order to be able to replace defective strips and filaments before they "burn out” and cause operational stoppage.
  • an excessively high sealing temperature results in burn damage to the sealing object, and an excessively low temperature results in poor sealing or a long sealing time.
  • Fig. 1 shows an apparatus for temperature measurement and temperature regulation in sealing devices in a packing or filling machine
  • Fig. 2 a shows a diagram illustrating the length of the electrical pulses through the heating band initially when the bands are relatively cold.
  • Fig. 2 b is illustrated how the electrical pulses are shorter when the heating bands have reacted the working temperature
  • Fig. 3 is a diagram showing the temperature as a function of and resistance in a metallic resistor material of the type employed in heat- generating heating strips or heating coils.
  • thermoplastic material layers at least along their common interface or contact surfaces are to be permanently sealed to one another by surface fusion of the plastic material.
  • This sealing is realised by heating of the thermoplastic materials to sealing or fusion temperature while the materials are at the same time urged against one another so that a surface fusion takes place.
  • a sealing device of the type referred to here comprises strip-shaped elements of resistor material in which heat is generated in that an electric current is passed through the strips.
  • heating strips are mounted on supports and secured in such a manner that an electrically and thermally insulating layer is disposed between the heating strips and the support.
  • the support and heating strip form a so-called sealing jaw which comprises a movable device which may be urged against a substrate or a counterjaw while the material intended for sealing is accommodated between the counterjaw and the sealing jaw.
  • the sealing devices function in such a manner that, on each sealing occasion, pulse-like quantities of heat are generated in the strip- shaped elements, whereafter this heat is transferred to the material intended for sealing on each sealing occasion in that the strip-shaped elements are urged against their substrate.
  • the heat pulses are synchronised with the sealing operation which also includes a period of pressure application and a subsequent cooling period in order that the surface-fused regions be given the opportunity to stabilise by cooling.
  • Each heat pulse is adapted in view of energy, temperature and pulse length so that optimum sealing strength is achieved in the shortest possible time (capacity conditions) and with suitably adapted temperature (not such a high temperature that the material is exposed to burn damage).
  • the apparatus schematically illustrated in Fig. 1 displays a sealing jaw 1 with heating strips 2 disposed on the sealing jaw 1.
  • the heating strips 2 of the sealing jaw 1 are connected to a current source 3, 4 which, for example, may be a direct current power source with a voltage of between 24 and 48 volts.
  • a current switch device 6 which, in this case, consists of an MOS transistor. Parallel across the transistor 6, there is disposed a direct current source which emits a constant, adjustable current, for example a current which may be regulated to 1 amp.
  • the aggregation point 12 is connected to a voltage source 8 by means of which an adjustable norm value can be obtained.
  • the circuit further includes drive means 9 which are partly operative to emit a guide voltage to the transistor 6 via its output 16, and partly to control the switch 11 by signals from its output 15.
  • the direct current regulator 5 will instead allow the passage of a current of, for example, 1 amp., in which event this current passes through the heating strips 2.
  • the current of 1 amp. causes a voltage across the heating strips 2, and this voltage or potential is impressed to the input of the regulator apparatus 7. Since the transistor 6 is not conductive, the switch 11 is in the closed state, for which reason the potential difference across the heating strips 2 amplified by the amplifier 10 will be supplied to the capacitor 13 which will be charged with a voltage which is proportional to the sensed voltage across the heating strips 2.
  • the regulator 14 emits an output potential which is of the opposite polarity to the "norm potential value" which was emitted by the voltage source or transducer 8 and which controls the input to the drive means 9.
  • the drive means 9 emits an output signal through the output 16 which "ignites” the transistor 6 which becomes live, in which event the heating strips 2 will be directly connected between the contacts 3 and 4 of the d.c. source and a large current controlled by the resistance of the heating strips will then pass through the heating strips which are, in such instance, heated.
  • the drive means 9 is also a timer which, by means of the switch 11, disconnects the connection between the amplifier 10 and the memory circuit 13 when the transistor 6 is conductive, and a powerful current passes through the heating strips 2.
  • the drive means 9 also functions as a timer for the connection-in frequency of the transistor 6 and also regulates the pulse length of the current through the transistor 6. If the heating strips 2 are cold (as they are at the beginning of the sealing sequence because of resistance difference), the voltage across the strips will, since they are powered with 1 amp. during the measurement pulse, be lower than the voltage will be when the heating strips are hot. As is apparent from Fig.
  • the pulses 17 are represented by the time which the transistor 6 is conductive, while the pulse gaps 18 represent that time when the transistor 6 is not conductive and, thus, no heat-generating current is led through the heating strips 2.
  • a (pulse-like) measurement current 19 is led through the heating strips 2 during the pulse gaps 18 between the heat-generating current pulses 17.
  • these measurement pulses 19, which are at constant current strength (e.g. 1 amp.) are led, during the gap in the current pulses, through the heating strips 2 and occasion the previously mentioned voltage which increases at the same rate as the temperature of the heating strips 2 increases, and constitutes a relative measurement of the temperature.
  • Each sealing sequence thus entails that the sealing strips, before or after having come into contact with their sealing substrate, are supplied with current pulses 17 which, as is apparent from Fig. 2, initially are relatively long (Fig. 2a) in order that the temperature in the heating strips rapidly rises to the adjusted level, while the temperature of the heating strips, when the adjusted level has been reached, are supplied with steadily shorter current pulses 19 (Fig. 2b) while the voltage across the heating strips 2 is constantly monitored and controlled with the aid of the measurement pulses.
  • the relationship between the resistance of the heating strips and their temperature is relatively linear, which is an advantage for the regulation function.
  • the time involved for the sealing sequence is selected in such a way that the connecting-in time of each current pulse constitutes at most 80 per cent of the time between two current pulses, which entails that there is always room for measurement pulses in the pulse gaps between the current pulses.
  • the regulator apparatus 7 and the drive means 9, like the MOS transistor 6 and the d.c. regulator 5, constitute components known in the trade which may have different characteristics.
  • the central aspect of the present invention is that the current supply through the heating strips is put into effect using a switching device which, in this particular case, consists of a transistor, and that the current supply is maintained in such a manner that the heat-generating current is split into pulses which generate thermal energy in the heating strips 2.
  • measurement current pulses are generated by means of a constant current emitter which are led through the heating strips and then give rise to a voltage which is proportional to the temperature of the heating strips.
  • the voltage may be processed through a regulator unit in such a manner that it results in an output potential which is proportional to the temperature of the heating strips and, with the aid of a supplied potential which constitutes a relative "norm value" for the temperature, the output potential from the regulator is balanced in such a manner that major differences between the norm value potential and the potential emitted from the regulator apparatus 7 entail that the drive means 9 emit long connecting-in pulses to the transistor 6 in order that the temperature in the heating strips will rapidly be altered such that the norm value potential and the potential emitted from the regulator apparatus 7 coincide.
  • the drive means 9 emits only brief connecting-in pulses to the transistor 6 in order that only heat emission and cooling of the heating strips be compensated for, such that the temperature in the strips is kept constant.
  • the apparatus may, as has also been intimated, additionally be employed for monitoring the temperature in heating elements or in filaments in order to achieve a constant working temperature in a heating coil or filament.
  • the above ⁇ mentioned heating strips are to be metallic, but it has proved that the monitoring and control system according to the invention functions just as well with ceramic heating strips which, in certain cases, have proved to be far superior to conventional metallic heating strips.
  • the present invention has proved to function well and be operationally reliable as well as entailing major savings, since elevated temperatures in filaments and heating strips result in their rapidly being spent and burnt out.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Package Closures (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Control Of Temperature (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)

Abstract

L'invention a trait à un procédé permettant de commander la température existant dans des dispositifs d'étanchéité utilisés dans l'industrie du conditionnement. Ces dispositifs sont pourvus d'éléments chauffés électriquement et faits d'un matériau dont la résistance est fonction de la température. Le courant électrique est divisé en impulsions dont la longueur est adaptée à l'aide d'un commutateur commandé (6). Pendant les interruptions intervenant entre ces impulsions de courant, des impulsions distinctes de courant de mesure d'une valeur connue et constante sont produites, entraînant une chute de tension électrique sur l'élément à résistance (2). Cette chute de tension, qui est proportionnelle à la température de l'élément à résistance, est alors comparée dans un régulateur (7) à un potentiel fixé correspondant à une température souhaitée. De la sorte, la différence de potentiel obtenue par détection entre la chute de tension mesurée et la valeur de potentiel fixé est ajustée afin d'agir sur un dispositif de commande (9) qui règle la longueur des impulsions de courant calogène.
PCT/SE1996/001394 1995-11-15 1996-10-30 Procede et appareil de commande de temperature Ceased WO1997018504A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BR9606707A BR9606707A (pt) 1995-11-15 1996-10-30 Processo e aparelho para monitorar e controlar a temperatura de dispositivos geradores de calor alimentados com corrente elétrica
JP9518775A JPH10512989A (ja) 1995-11-15 1996-10-30 電流を供給される発熱装置の温度を監視および制御する方法
AU76585/96A AU7658596A (en) 1995-11-15 1996-10-30 Method and apparatus for temperature control
EP96939394A EP0804755A1 (fr) 1995-11-15 1996-10-30 Procede et appareil de commande de temperature
EA199700109A EA199700109A1 (ru) 1995-11-15 1997-08-14 Способ и устройство управления температурой

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9504066-3 1995-11-15
SE9504066A SE9504066D0 (sv) 1995-11-15 1995-11-15 Sätt att kontrollera och styra temperaturen hos medelst elektrisk ström matade, värmegenererade organ

Publications (1)

Publication Number Publication Date
WO1997018504A1 true WO1997018504A1 (fr) 1997-05-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/001394 Ceased WO1997018504A1 (fr) 1995-11-15 1996-10-30 Procede et appareil de commande de temperature

Country Status (9)

Country Link
EP (1) EP0804755A1 (fr)
JP (1) JPH10512989A (fr)
CN (1) CN1166212A (fr)
AU (1) AU7658596A (fr)
BR (1) BR9606707A (fr)
CA (1) CA2207704A1 (fr)
EA (1) EA199700109A1 (fr)
SE (1) SE9504066D0 (fr)
WO (1) WO1997018504A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1684148A1 (fr) * 2005-01-14 2006-07-26 Hakko Corporation Régulateur pour dispositif de chauffage alimenté par une batterie
WO2009144446A1 (fr) * 2008-05-29 2009-12-03 Ishida Europe Limited Unité de scellement étanche de contenant
FR2935632A1 (fr) * 2008-09-09 2010-03-12 Bernhardt Et Ci Ets Procede et systeme de mesure de temperature notamment dans un systeme de soudure par chauffage
CN102081411A (zh) * 2010-09-29 2011-06-01 楚天科技股份有限公司 大输液软袋生产线用焊盖加热控制系统
ITRE20100042A1 (it) * 2010-05-25 2011-11-26 Reber S R L Macchina per sigillare confezioni sottovuoto e corrispondente metodo di controllo
CN109254075A (zh) * 2018-09-29 2019-01-22 中国科学院电工研究所 一种用于液体环境高压试验的电极加热装置
EP3442871A4 (fr) * 2016-04-11 2019-11-13 Automated Packaging Systems, Inc. Machine de gonflage de coussin d'air
EP4424500A3 (fr) * 2023-03-02 2024-12-04 Force Global - ROPEX America LLC Bande thermosoudable avec chemins électriques séparés pour la détection de tension et la transmission de charge de courant

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015216806A1 (de) * 2015-09-02 2017-03-02 Robert Bosch Gmbh Sensorvorrichtung und Verfahren zum Kalibrieren einer Sensorvorrichtung
CN108710389A (zh) * 2018-05-18 2018-10-26 哈尔滨工业大学深圳研究生院 无温度传感器稳定温控系统与方法
CN114879775B (zh) * 2022-05-25 2024-05-31 上海迈振电子科技有限公司 一种温度控制方法、装置、系统、设备及存储介质
CN114859997B (zh) * 2022-05-25 2024-07-26 上海迈振电子科技有限公司 一种温度控制方法、装置、系统、设备及存储介质

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US4377138A (en) * 1980-03-03 1983-03-22 Mitsubishi Denki Kabushiki Kaisha Glow plug control system for diesel engine
US4549073A (en) * 1981-11-06 1985-10-22 Oximetrix, Inc. Current controller for resistive heating element
EP0288147A2 (fr) * 1987-03-30 1988-10-26 Automated Packaging Systems, Inc. Commande de la température de scellage à chaud

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4377138A (en) * 1980-03-03 1983-03-22 Mitsubishi Denki Kabushiki Kaisha Glow plug control system for diesel engine
US4549073A (en) * 1981-11-06 1985-10-22 Oximetrix, Inc. Current controller for resistive heating element
EP0288147A2 (fr) * 1987-03-30 1988-10-26 Automated Packaging Systems, Inc. Commande de la température de scellage à chaud

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1684148A1 (fr) * 2005-01-14 2006-07-26 Hakko Corporation Régulateur pour dispositif de chauffage alimenté par une batterie
US7608805B2 (en) 2005-01-14 2009-10-27 Hakko Corporation Control system for battery powered heating device
WO2009144446A1 (fr) * 2008-05-29 2009-12-03 Ishida Europe Limited Unité de scellement étanche de contenant
FR2935632A1 (fr) * 2008-09-09 2010-03-12 Bernhardt Et Ci Ets Procede et systeme de mesure de temperature notamment dans un systeme de soudure par chauffage
WO2010029241A1 (fr) * 2008-09-09 2010-03-18 Etablissements Bernhardt Et Cie Mesure de temperature dans un systeme de soudure par chauffage
ITRE20100042A1 (it) * 2010-05-25 2011-11-26 Reber S R L Macchina per sigillare confezioni sottovuoto e corrispondente metodo di controllo
EP2390086A3 (fr) * 2010-05-25 2012-04-04 Reber S.r.l. Machine pour sceller des emballages sous vide et procédé de contrôle correspondant
CN102081411A (zh) * 2010-09-29 2011-06-01 楚天科技股份有限公司 大输液软袋生产线用焊盖加热控制系统
CN102081411B (zh) * 2010-09-29 2012-07-25 楚天科技股份有限公司 大输液软袋生产线用焊盖加热控制系统
EP3442871A4 (fr) * 2016-04-11 2019-11-13 Automated Packaging Systems, Inc. Machine de gonflage de coussin d'air
CN109254075A (zh) * 2018-09-29 2019-01-22 中国科学院电工研究所 一种用于液体环境高压试验的电极加热装置
EP4424500A3 (fr) * 2023-03-02 2024-12-04 Force Global - ROPEX America LLC Bande thermosoudable avec chemins électriques séparés pour la détection de tension et la transmission de charge de courant

Also Published As

Publication number Publication date
SE9504066D0 (sv) 1995-11-15
AU7658596A (en) 1997-06-05
EP0804755A1 (fr) 1997-11-05
EA199700109A1 (ru) 1997-12-30
CN1166212A (zh) 1997-11-26
JPH10512989A (ja) 1998-12-08
CA2207704A1 (fr) 1997-05-22
BR9606707A (pt) 1999-03-02

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