CN100450875C - 一种在连续运动过程中密封包装件的方法 - Google Patents

一种在连续运动过程中密封包装件的方法 Download PDF

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CN100450875C
CN100450875C CNB018172865A CN01817286A CN100450875C CN 100450875 C CN100450875 C CN 100450875C CN B018172865 A CNB018172865 A CN B018172865A CN 01817286 A CN01817286 A CN 01817286A CN 100450875 C CN100450875 C CN 100450875C
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package
inductor
speed
length
sealing
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CN1469828A (zh
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G·霍姆斯特伦
K·贝里
A·维贝里
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Tetra Laval Holdings and Finance SA
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    • 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
    • B65B51/22—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding
    • B65B51/227—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding by induction welding
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3644—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a ribbon, band or 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
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3656—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a layer of a multilayer part to be joined, e.g. for joining plastic-metal laminates
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • B29C65/368—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic with a polymer coating
    • 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • 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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/723—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 structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321—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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • 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
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • 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
    • B29C66/91641—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 the heat or the thermal flux being non-constant over time
    • B29C66/91643—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 the heat or the thermal flux being non-constant over time following a heat-time profile
    • 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
    • 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
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
    • 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
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • 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
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    • 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
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    • B29C66/90—Measuring or controlling the joining process
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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
    • B29C66/90—Measuring or controlling the joining process
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    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Package Closures (AREA)
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Abstract

本发明涉及一种用于在连续运动中密封包装(1)的方法。一排包装(1)被电动机(8)驱动而通过包括有感应器(4)的密封站。感应器(4)由IH(感应加热)发生器(5)以脉冲形式驱动。采用PLC系统(6)来控制IH发生器(5)。PLC系统(6)分别通过电动机驱动器(9)和编码器(7)来接收关于包装(1)的速度和位置的信息。

Description

一种在连续运动过程中密封包装件的方法
技术领域
本发明涉及一种用于在连续运动中密封包装件的方法和装置。此方法通常用于成形和密封机中。
背景技术
包装件在成形和密封机的第一生产线中被抬起，并在一个边缘、通常是顶部处被密封。在密封后包装件通过一个或多个填充器。从一个或多个填充器中出来的包装件返回到成形和密封机的第二生产线中，在此处密封各包装件的另一边缘。在本说明书中，成形和密封机的两条生产线以及一个或多个填充器统称为填充机。
采用已分开的感应加热变压器用于机器的不同速度。因此，对于包装件运动中的各速度来说，感应加热的施加是以连续的能量进行的。必须具有不同组合的变压器和电容器，从而得到用于不同速度的信号的正确相移。当机器速度例如因采用另一类型或大小的包装件而变化时，就应更换变压器。现有的方法导致了在加速和迟滞过程中浪费了大量的包装件。
发明内容
需要有一种用于包装件的与速度无关的密封。此密封应当能在包装件的连续运动过程中进行。
作为一个示例，已经开发了一种新型的成形和密封机，其可以多种(三到五种)固定的速度进行操作。这种机器安装在用于蒸馏食品的包装件生产线中。为了改进机器以与本行业所用的现有填充技术更好地一起工作，需要机器在速度方面更具灵活性，因而可以在变化的并未预先固定的速度下运行。
因此，本发明的一个目的是提供一种与速度无关的密封。
另一目的是在不同速度及加速和迟滞过程中以相同装置来进行密封。
在本发明的方法中，包装件在连续运动的过程中被密封。传送装置驱动一排包装件，使其通过包括有感应器的密封站。感应器以脉冲形式被驱动。采用可编程逻辑控制器(PLC)系统来控制感应器的脉冲。PLC系统采用来自分别与电动机相连的电动机驱动器和编码器的信号来驱动传送装置。
如上所述，各包装件的顶部通常被先密封，因此包装件被倒置地输送。然后在包装件中填充物品，之后再密封包装件的底部。顶部和底部的密封在成形和密封机中进行。因此，对于各成形和密封机来说存在着两个密封站，它们通常均由PLC系统控制。
附图说明
下面将参考附图来进一步介绍本发明。
图1是采用了本发明的密封站的原理图。
图2是显示了对各包装件施加作用的感应器的脉冲示例的图示。
具体实施方式
在图1中显示了一排包装件1。此排包装件1在正常使用中以恒定的速度输送。可根据包装件1的类型以及待填充到包装件1中的物品来改变速度。包装件1设置在由电动机8驱动的一些类型的传送装置(未示出)中。传统装置可以是链条，其具有用于容纳各包装件1的装置。电动机8由电动机驱动器9控制。此外，在电动机8上连接了编码器7。编码器7和电动机驱动器9与PLC(可编程逻辑控制器)系统6相连。PLC系统6还与用于感应加热的发生器5(下面通常称为IH发生器5)相连。IH发生器5控制位于用于包装件1的密封站处的感应器4的输送。感应器4通常包括两个感应器板，它们分别处于密封站中的包装件1的各侧。
编码器7实际上包括与电动机8一起旋转的盘。在一个实施例中，采用具有每转256个脉冲的编码器7。此256个脉冲设定成对应于2个包装件以及它们之间的间隔。包装件1的位置和速度分别通过编码器7和电动机驱动器9而送到PLC系统6中。PLC系统6采用此信息来控制IH发生器5，并最终控制感应器4。
例如根据填充器的容量、包装件1的大小以及待填充到包装件1中的物品的形式，可在不同的速度下驱动传送装置。因此，相同的填充机可以不同的速度来驱动。
在图1中，一排包装件1通过一个感应器4。各包装件1具有底边2和顶边3。一般来说先密封一边，然后填充包装件，最后密封另一边。通过感应器4在边缘区域加热金属、通常是铝来完成密封。当铝被加热时，边缘区域各侧上的塑料层被铝加热并熔化。在感应器4进行感应后，一些压辊(未示出)将边缘压在一起，因而被加热的塑料就熔合在一起。各包装件1的边缘具有长度lp，此排包装件1被长度为ls的间隔隔开。感应器4在包装件1的输送方向上的长度为li。感应器4的长度li是一个包装件1的长度lp和两个相邻包装件1之间的距离ls之和，即li＝lp+ls。
本发明的密封系统可用于连续运动的一排包装件1中。感应加热以脉冲形式从IH发生器5施加到感应器4中。感应加热以固定长度的脉冲施加。脉冲间的时间间隔根据这排包装件1的速度而变化。所施加的能量也可根据速度来稍加调节，即，在更高的速度下能量可以低一些。这可用于补偿在施加感应加热和压辊之间的冷却时间的差异。脉冲由PLC系统6起动。包装件1的位置由与PLC系统6相连的编码器7监控。
在图2中显示了图形形式的一个包装件的密封。在第一脉冲(最上方曲线)下，包装件1刚刚进入到感应器4的区域中，因此，只有底边2的右侧部分(如图1所示)受到感应器4的作用。在第一和第二脉冲之间的停顿中，包装件1进一步向右移动，并且如第二曲线所示，底边2的更大部分受到密封站中的感应器4的作用。在第三和第四脉冲中，对各脉冲来说包装件1还在进一步向右移动。应当注意的是，在第一脉冲的能量开始增加的位置处，第三脉冲的能量开始下降。这对第二和第四脉冲来说也是如此。当包装件1离开感应器4的区域时，底边2在其整个长度lp上进行了恒定的感应加热。这反映在图2中最下方的曲线中，其显示了由图2中四条上方曲线所表示的四个脉冲所给出的总体能量。在这种情况下，能量通过每感应器长度li上两个脉冲而施加给包装件1，即各包装件1受到多个部分脉冲(图2中的脉冲1到4)的作用，它们的和对应于包装件1的整个长度上的两个脉冲。在图2所示示例中，填充机的速度设定成每小时24000个包装件，即在一小时内密封24000个包装件。脉冲时间设定为64毫秒，脉冲间的停顿为11毫秒。
本领域的技术人员可以理解，每感应器长度li上的脉冲数目可以变化。对于每转256个脉冲的编码器来说，每感应器长度li上的脉冲数目最好为2，4，8，16等，即可被256等分。各曲线的起始或终止斜度取决于速度，并因此取决于在脉冲持续过程中包装件所经过的距离。
在起动时，采用进入感应器4的区域内的第一包装件1的位置来触发密封系统。在知道了包装件1的起始点和速度时，PLC系统6将根据此信息来控制到感应器4的脉冲。脉冲长度设定成与可能的最高速度相关，使得脉冲不会形成干涉。由于脉冲频率与包装件1的速度相关，因此在加速和迟滞过程中以及在速度产生波动时均能进行密封。如果增加每包装件的脉冲数目，那么可以提高在加速和迟滞过程中的密封效果。在图2所示的示例中，为简单起见只显示了两个脉冲。通常可采用每包装件4到16个脉冲。

Claims (9)

1.一种在连续运动过程中密封包装件(1)的方法，其中一排包装件(1)被电动机(8)驱动而通过包括有静止的感应器(4)的密封站，所述感应器(4)以脉冲形式驱动，
其特征在于，
每个包装件由一些脉冲作用，所述脉冲具有固定的长度，所述脉冲间的时间间隔根据所述一排包装件(1)的速度而变化。
2.根据权利要求1所述的方法，其特征在于，采用PLC系统(6)并通过感应加热发生器(5)来控制所述感应器(4)的输送。
3.根据权利要求2所述的方法，其特征在于，将关于所述包装件(1)的速度和位置的信息传送给所述PLC系统(6)。
4.根据权利要求3所述的方法，其特征在于，所述关于所述包装件(1)的速度和位置的信息通过电动机驱动器(9)和编码器(7)给出。
5.根据上述权利要求1所述的方法，其特征在于，根据所述速度来调节所施加的能量。
6.根据上述权利要求1所述的方法，其特征在于，所述一排包装件(1)中的各所述包装件(1)在输送方向上具有相同的长度(lp)，所述包装件(1)以距离(ls)相互间隔开。
7.根据权利要求7所述的方法，其特征在于，所述感应器(4)的在所述包装件(1)的输送方向上的长度(li)等于一个包装件的长度(lp)与两个相邻包装件之间的间隔的距离(ls)之和。
8.根据上述权利要求7所述的方法，其特征在于，各所述包装件在所述包装件(1)的整个长度(lp)上被施加恒定的密封能量。
9.根据上述权利要求中任一项所述的方法，其特征在于，在起动时所述一排包装件(1)中的第一包装件(1)触发一个密封系统。
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