CN1166212A - 一种监视和控制由电流供应的产热设备温度的方法 - Google Patents

一种监视和控制由电流供应的产热设备温度的方法 Download PDF

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CN1166212A
CN1166212A CN96191216A CN96191216A CN1166212A CN 1166212 A CN1166212 A CN 1166212A CN 96191216 A CN96191216 A CN 96191216A CN 96191216 A CN96191216 A CN 96191216A CN 1166212 A CN1166212 A CN 1166212A
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C·英格维特
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Tetra Laval Holdings and Finance SA
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
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    • 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
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    • 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
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    • 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
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    • 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
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    • B29C65/38—Impulse heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract

本发明涉及控制在包装工业中使用的密封设备中的温度的方法，该密封设备具有由阻抗依赖于温度的材料制成的电加热元件。电流被分成脉冲，脉冲的长度通过一个控制开关(6)来调节。在上述电流脉冲的间隔中，独立地产生恒定的且值已知的测量脉冲，这些脉冲将在电阻元件(2)上产生电压降。该电压降与电阻元件的温度成比例。电压降将在调节器(7)中与对应于所希望的温度的设定电位相比较，在测得的电压降和设定的电位值之间测定的电位差适合被用来控制驱动装置(9)，该驱动装置控制产热电流脉冲的长度。

Description

一种监视和控制由电流供应的产热设备温度的方法
技术领域
本发明涉及一种监视和控制产热设备的方法，该设备由电流供应并周期性地与工作过程的执行相结合来产生热量，例如，在包装生产过程中最好通过使热塑性外层表面熔合来密封，这些设备表现为一个或多个具有温度依赖性的电阻材料的导电电阻元件，最好为加热条形，在每个工作周期中提供给电阻元件的产热电流都被分成若干个电流脉冲，脉冲的长度由一个可控电流开关装置来控制。
背景技术
在包装工业中，与包装生产相结合，常常借助于所提供的热和压力将包装材料的表面密封或与另外一个融合。这样的密封常常使用所谓的热封夹，即成对可移动的装置，要密封的包装材料表面被容纳在两者之间并被压在一起。在其中至少一个热封夹中有放热元件，向互相压在一起的热塑性表面提供足够的密封热量，使两者融合在一起，形成牢靠且耐用的密封。如果提供的热量不够的话，密封将不牢靠或不耐用，过多的热能则可能会导致不可控制的密封区域，而在太高的温度下提供的热能将会导致使材料变色这样形式的燃烧损坏，在最坏的情况下，则可能导致烧焦或炭化。在包装或装填机器中，为提高生产能力，有若干对独立的密封夹在工作，还会出现这样的问题，即不同夹中的不同温度或不同供应数量的热能会给出不同的密封效果。
发明概述
因此，在本领域上有必要有一种技术解决方案，以解决监视和控制密封夹中的供热和温度以及以一定的方式管理不同的密封夹使它们给出一致的、均匀的密封效果这个问题。本发明提供了这个问题的解决方案，其特征在于，在流经前面说过金属元件的上述电流脉冲之间的脉冲间隙，产生恒定的且电流强度已知的测量电流脉冲，这些测量电流脉冲在电阻元件间产生电压，与该电压有关的电压或电位值构成了电阻元件温度的相对测量，上述电压或电位值与预先设定的标准电位值相比较，标准值和检测的值之间的电位差被用来以一定的方式控制上述可控电流开关设备的驱动设备，使得电流脉冲的长度分别对应于预先设定的标准值和所确定的由测量电流引起的电阻元件上的电压降之间的比较结果而增加或减少。
如上所述，这个技术问题本质上在以前已经知道了，并引起了主要的困难，以前采用的解决方案是单独地调整密封夹，使它们在最大程度上相同，或用通常的说法，使它们互相匹配。最普通的情况，密封夹的产热和放热装置由分布在绝缘衬底上的电阻材料的薄片组成，而衬底又分布在钢轨上。使这些密封夹在热方面完全相似的困难在于，加热片的厚度、宽度、长度等并不是完全均匀的，并且不同夹之间的衬底隔热可能不相同，而这会引起不可控的热量的耗散。还有一个因素就是密封夹的薄片会随时间而磨损，结果它们的热性能，即它们产生的热量变得不同。本发明所提出的针对该问题的方案，使加热片的温度被一个调节器所控制，而密封夹与密封衬底的接合时间则利用已知的、优选地用机械装置来控制。这样，根据本发明的方法将监视密封夹的加热片作为起始点，以便使它们的温度总是相同(可调节)的，并且利用这些装置，控制供热的量和密封的效果。因此，如果密封效果不是所希望的话，就调节加热片的温度直到达到所希望的密封效果为止。如果使用了若干个密封夹，不同夹的密封片温度可被自动调节到相同等级，不管加热片是否已经磨损或者密封夹是否表现出不同的电、热性能。
然而，本发明并不仅仅适用于调节密封夹的温度，在本领域上，还需要一种能够测量和记录有电流供应的细丝和热元件中的温度的技术。这种需要能够测量和记录细丝、热元件以及加热片中的温度的原因，是温度是一种产热设备的状态的诊断指示。加热片或加热元件的使用寿命受过高温度的影响很大，例如灯泡中的灯丝并不是这种情况，出于这个原因，在技术上需要能够连续地监视加热片和细丝中的温度，以便能够在它们烧毁并导致停机之前更换缺损的片和细丝。如上所述，由于控制密封温度对能够在最短的时间内获得理想的密封效果至关重要，因此非常关心能够调节密封设备的加热片中的温度。过高的密封温度会烧坏密封物体，而过低的温度又会导致密封较差或密封时间较长。这样，非常需要能够调节加热片和细丝等的温度并记录测量，以便能够监视安装的情况，从而通过调节温度使密封单元的密封效果最佳化。
一个已知的事实是大量的金属的阻抗都有具有一定温度依赖关系的阻抗。许多所谓的电阻材料由具有高度正温度依赖关系阻抗的金属合金组成的，即阻抗随温度的增加而增加。对绝大多数金属和合金而言，温度阻抗的函数在比较宽的温度范围内都是线性的。由于在有电流源供电的加热元件中的加热片或加热线圈等的温度，除了受流经加热片的电流引起的产热影响外，还受一些因素的影响，如向衬底以及周围空气的热耗散，很难能够连续控制和监视温度而不采用温度传感器测定加热片的温度。然而，这样的测量比较复杂、速度慢且精度不高，而在另一方面，这里提出的根据本发明的方法则比较精确、快速、连续且实现起来简单。此外，一个已知类型的传感器经常会磨损掉或消耗掉并经常改变其特性，结果导致测量精度降低。根据本发明的方法和设备并没有这些缺点。
附图简述
下面将特别参考所附的简图，在此及以后对本发明的一个应用于包装材料的密封设备中的优选实施方案进行更为详细的叙述，这些图为：
图1表示包装或装填机器的密封设备中一个用于温度测量和温度调节的设备；
图2a表示在加热条比较冷时最初流经加热条的电脉冲长度的曲线；
图2b表示在加热条达到工作温度后电脉冲的长度是如何缩短的；
图3表示产热加热片或加热线圈所采用的一类金属电阻材料中作为阻抗函数的温度曲线。
优选实施方案的叙述
在这里叙述并在包装工业的密封设备中实际应用的本发明的一个实施方案中，前提是相互面对或相互重叠的材料要被用塑性材料表面融合，永久地与另一个密封在一起，至少这些材料的公共界面或接触面表现为热塑性材料层。这种密封是通过将热塑性材料加热到密封或融合温度，同时加力将材料推靠在一起以发生表面融合来实现的。
以此作参考的这类密封设备，包含电阻材料的片状元件，由于电流流经这些片会在其中产生热量。这些加热片被安装在支架上并以一定的方式固定，使得在加热片和支架之间形成一个绝缘隔热层。支架和加热片共同形成所谓的密封夹，包含一个可被推靠在一个衬底或反夹上的可移动设备，要密封的材料被容纳在反夹和密封夹之间。
密封设备最普通的工作方式是，在每次密封时，在片状元件中产生类似脉冲数量的热量，此后由于片状元件被与它们的衬底推靠在一起，这些热量就在每次密封时都被传送给要密封的材料。这样，热脉冲与密封操作是同步的，密封操作还包括加压阶段及随后的冷却阶段以便使表面融合区域有机会通过冷却稳固下来。每个热脉冲从能量、温度和脉冲长度来看都很合适，从而在最短的时间内(能力状况)并利用适当的温度(不是使材料烧坏那样的高温)获得最佳的密封强度。如前所述，由于在密封操作中加热片中的温度被保持在恒定、可调的水平上，因而可以获得最佳的调节。图1中简单表示的设备表示密封夹1，加热片2位于密封夹1之上。密封夹1的加热片2与电流源3、4相连，电流源可为电压在24到48V之间的直流电流源。
在电流电路中，还有一个相连的电流开关装置6，在这种情况下，开关装置由一个MOS三极管组成。与三极管6平行分布着一个输出稳恒、可调电流的直流电流源，例如，电流可被调到1安培。与加热片2平行分布着一个调节设备7，包括放大器部分10、简略表示的开关11、包含电容13和一个包括总汇合点12的PI调节器电路14(PI＝比例积分)的存储电路。汇合点12与电压源8相连，以此来得到一个可调的标准值。该电路还包括驱动装置9，部分作用是通过其输出端16向三极管6输送一个导通电流，部分作用是通过来自其输出端15的信号控制开关11。当密封夹1开始一个工作循环时，密封夹被通过已知的机械设备与其密封衬底推靠在一起，并且在加密封压力之前或之后，由于电压与触点3和4相连，开始密封工序。
由于电流开关设备或三极管6在密封工序开始之前是不导通的，直流调节器5将允许1安培的电流通过，在这种情况下该电流流过加热片2。1安培的电流在加热片上产生一个电压，该电压和电位被加在调节器装置7的输入端。由于三极管不通，开关11处于闭合状态，由于这个原因，加热片2上被放大器10放大后的电位差将被提供给电容13，该电容将被以加热片2上所测定的电压充电。调节器14发出一个输出电位，其极性与电压源或传感器8发出的控制驱动装置9输入的标准电位值相反。当调节器装置7的输出端14的电位与来自三极管8的标准值平衡时，驱动装置9经过输出端16发出一个输出信号，“触发”三极管6，该三极管变得有效，在这种情况下，加热片2将直接连在直流电压源的触点3和4之间，由加热片阻抗控制的大电流将通过加热片，并在这个阶段加热加热片。
驱动装置9也是一个定时器，在三极管6导通并且有大功率电流流经加热片2时，通过开关11断开放大器10和存储电路13之间的连接。驱动装置9还作为三极管6的接通频率定时器来使用，并调节流经三极管6的电流脉冲长度。如果加热片2比较冷(当它们在开始密封工序时由于阻抗的差异)，由于在测量脉冲过程中它们是以1安培供电的，加热片间的电压将低于加热片较热时的电压。由图2a显而易见，脉冲17以三极管6导通的时间来代表，而脉冲间隙18则代表三极管6不通并且没有加热电流被导流通过加热片的时间。由图2b显而易见，在加热电流脉冲之间的脉冲间隙18中，(类似脉冲的)测量电流19被导流通过加热片12。如前所述，在电流脉冲的间隙中，这些电流强度恒定(如1安培)的测量脉冲19被导流通过加热片2，引起前面提到的与加热片2的温度同比例上升的电压，并形成温度的相对测量。
这样，在密封片与它们的密封衬底接触之前或之后，每个密封工序都使加热片以电流脉冲17来供电，由图2显而易见，电流脉冲最初比较长(图2a)，以使加热片的温度迅速上升到调节水平，而当加热片的稳定达到调节水平后，则以稳定的较短的电流脉冲19(图2b)来供电，同时借助于测量脉冲，连续监视和控制加热片2间的电压。由图3显而易见，加热片的阻抗和它们的温度之间的关系基本是线性的，有利于实现调节。
以一定的方法选择密封工序所用的时间，使得每个电流脉冲的接通时间最大可占两个电流脉冲之间80％的时间，从而使得在电流脉冲之间的脉冲间隙有测量脉冲的使用余地。
调节器装置7和驱动装置9，象MOS三极管6和直流调节器5一样，组成了内行知道的可能具有不同特性的元件。本发明的中心方面，在于通过加热片的供电电流通过一个开关装置起作用，在特殊情况下，开关装置由三极管组成，并且以一定的方式维持这个供电电流，使产热电流被分成脉冲，在加热片2中产生热能。在供电电流脉冲的脉冲间隙，测量电流脉冲通过一个恒流发生器产生并被导流通过加热片，接着产生一个与加热片温度成比例的电压。该电压可通过调节器单元以一定的方式来处理，以产生一个与加热片温度成比例的输出电位，并借助于所提供的一个形成温度的相对“标准值”的电压，以一定的方式平衡来自调节器的输出电位，以便标准值电位和调节器装置7发出的电位之间的主要差值使驱动装置9向三极管6发出长接通脉冲，从而使加热片中的温度被迅速改变，使标准值电位和调节器装置7发出的电位一致。在标准值电位和所发出的电位相等时，驱动装置9向三极管6发出只短暂接通的脉冲，从而只补偿加热片的热发散和冷却，使加热片中的温度保持恒定。
如上所述，在所叙述的实施方案中已经讨论了与包装材料的密封设备有关的一个方面，但是，如同已经提示过的那样，这个设备还可另外被用来监视加热元件或细丝中的温度，以便在加热线圈或细丝中获得恒定的工作温度。在说明的正文中也已经假定上面提到的加热片是金属的，但是已经证明，根据本发明的监视和控制系统对陶瓷加热片也同样工作得很好，在一定的情况下，还被证明远比金属加热片更优越。
本发明已被证明工作良好且运行可靠，由于细丝和加热片中的高温会使它们很快消耗烧毁，本发明也大大节约了开支。
本发明不应被认为仅限于上述和附图所表现的内容，在不离开所附权利要求的精神和范畴的前提下，可以考虑进行许多改进。

Claims (9)

1、一种监视和控制产热设备温度的方法，该设备由电流供应并周期性地与工作过程的执行相结合产生热能，例如，在包装生产过程中利用热塑性外层的表面融合来进行密封，该设备表现为一个或多个依赖于温度的电阻材料的电阻元件，优选为加热片或加热体的形式，在每个工作周期中提供给电阻元件的产热电流，在每个工作周期中都被分成由可控电流开关设备(6)控制脉冲长度的电流脉冲，该方法的特征在于，在上述电流脉冲(17)之间的脉冲间隙(18)内，产生经过元件(2)的测量电流脉冲(19)，该测量电流脉冲为稳恒电流且电流强度已知，并在电阻元件(2)间产生一个电压，该电压或与该电压有关的电位值形成了电阻元件(2)温度的相对测量；所说的电压电位值在调节器装置中与预先设定的标准电位值相比较；标准值和测定值之间的电位差被用来以一定的方式控制用于可控电流开关的驱动装置(9)，以分别对应于预先设定的标准值和测定的由测量电流在电阻元件(2)间产生的电压之间的比较结果以增加或减少电流脉冲的长度。
2、根据权利要求1的方法，其特征在于，开始上述产热设备(1)电流供应的序列，将象序列的长度一样，借助于外部控制装置(7、9)来实现，控制装置在每个工作循环中都给出一个恒定的序列长度。
3、根据权利要求2的方法，其特征在于，在由分布在密封夹(1)上的加热片(2)组成的密封设备电流供应序列的开始，是在加热片与它们的密封衬底接触时实现的；这个序列在加热片(2)被从密封衬底移走之前结束。
4、根据权利要求1的方法，其特征在于，电流脉冲(17、19)由驱动装置(9)在一个固定的频率处起动；最大脉冲长度占两个连续电流脉冲之间80％的时间。
5、根据权利要求4的方法，其特征在于，对应于上述可控开关设备的接通时间的电流脉冲长度(17、19)，是由一个在电流脉冲的间隙耦合进来的调节器装置(7)来调整的，该装置测定供有恒定测量电流的加热片(2)之间的电位，这个电位被与预先设定的标准值相比较，标准值已经被送给调节器(12)并用来控制优选的由功率三极管如MOS三极管组成的开关设备(6)，该三极管在启动后将产热电流导过加热片(2)。
6、一种控制有电流供应并优选地用于塑性材料密封设备的产热设备中温度的设备，其特征在于：
a)产热设备表现为阻抗依赖于温度的导电加热片(2)；
b)与上述加热片(2)相连的电流源，用于在加热片或加热片组中(2)通过供应脉冲电流来产生热量。
c)分布在加热片(2)的电流供应电路中的电流开关设备(6)；以及
d)测定上述加热片(2)间电压并且根据测定结果控制驱动装置(9)及上述电流开关设备(6)的接通时间的装置。
7、根据权利要求6的设备，其特征在于，产热设备由包含加热片(2)的密封设备组成，该设备被用于热塑性材料或与热塑性材料一起提供的包装材料的密封，借助于该密封设备和提供的热和压力，利用互相面对的塑料层的表面融合接合在一起。
8、根据权利要求6的设备，其特征在于，加热片(2)由阻抗依赖于温度的金属或陶瓷材料组成。
9、根据权利要求6的设备，其特征在于，电流开关设备(6)由半导体，最好是三极管组成。
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CA2207704A1 (en) 1997-05-22
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EA199700109A1 (ru) 1997-12-30
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WO1997018504A1 (en) 1997-05-22
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JPH10512989A (ja) 1998-12-08

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