CN1606484A - 包装材料的焊接设备 - Google Patents

包装材料的焊接设备 Download PDF

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CN1606484A
CN1606484A CNA028254759A CN02825475A CN1606484A CN 1606484 A CN1606484 A CN 1606484A CN A028254759 A CNA028254759 A CN A028254759A CN 02825475 A CN02825475 A CN 02825475A CN 1606484 A CN1606484 A CN 1606484A
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ferromagnetic
packaging material
ferromagnetic element
equipment
magnetic field
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CN1309525C (zh
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雅克·托马塞
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Aisapack Holding SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K13/00—Welding by high-frequency current heating
    • B23K13/01—Welding by high-frequency current heating by induction heating
    • B23K13/02—Seam welding
    • B23K13/025—Seam welding for tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K13/00—Welding by high-frequency current heating
    • B23K13/01—Welding by high-frequency current heating by induction heating
    • B23K13/02—Seam 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
    • B29C65/3656—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
    • B29C65/3668—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 means for supplying heat to said heated elements which remain in the join, e.g. special induction coils
    • 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
    • B29C66/01—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
    • B29C66/40—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
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • 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
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/48—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively
    • B29C53/50—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively using internal forming surfaces, e.g. mandrels
    • 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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
    • B29K2995/0008—Magnetic or paramagnetic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B29L2009/003—Layered products comprising a metal layer

Abstract

本发明涉及一种以移动方式焊接一包装材料(1)的焊接设备，该包装材料包括一层可以采用电磁感应加热的材料和一层包含一焊接区(2)的热塑性材料，所述焊接区(2)沿所述包装材料的移动方向延伸；所述焊接设备包括一交流电流发电机、一将交流电流转变成磁场的线圈(3、5、6)、一使磁场的磁力线沿确定的方向导通的铁磁元件(7、8、10－13)，磁场取向成穿过包装材料(1)，用于感应加热所述能用电磁感应加热的层；所述焊接设备的特征在于，它包括一组铁磁元件(7、8、10－13、19－21)，所述铁磁元件配置成使磁场的磁力线在沿所述焊接区(2)定位的至少两个不同的区位(14、16－18)处穿过所述包装材料(1)。

Description

包装材料的焊接设备
技术领域
本发明涉及一种以移动方式的包装材料的焊接设备。这种包装材料由至少一层热塑性材料和一层可以采用电磁感应加热的材料(例如金属或聚合物基材料)组成。该设备包括交流电发电机和将交流电流转变成磁场的线圈。让这些磁场的磁力线取向通过该包装材料，因此在金属层产生Foucault电流，这种现象所产生的热量用于熔化一部分(焊接区)热塑性材料层。
背景技术
TETRA PAK的法国专利申请号2.073.137提出一种用于焊接装铁氧体细棒管的感应线圈，这是为了增加线圈的感应。
AMERICAN CAN COMPANY的法国专利申请NO 2.429.667提出了一种焊接管的感应线圈，其特征在于，用作管移动导轨的内芯棒沿其长度有一个铁氧体类的小棒，这是为了实现一按照沿管移动方向取向的按一窄条局部进行的焊接。
在成开形过程中该线圈绕着管配置。
OHIO CRANKSHAFT COMPANY的美国专利NO 3 242 300描述了一种以螺旋方式焊接管的感应线圈。待焊接表面两侧配备了铁氧体类元件，以便保证按照连续曲线焊接。
在现有技术的这些设备中，借助铁磁元件只能部分地使用线圈产生的这些磁场回路集中。由此可以得出，磁场的一些磁力线在一些不对应于焊接区的地方通过包装材料。加热这些非控制的区位可能产生包装材料变形，例如成波纹状。
发明内容
本发明的贡献主要在于克服上述问题，其方法是，将热量更多对准焊接区。本发明涉及一种移动的包装材料的焊接设备，该包装材料包括一层能采用电磁感应加热的材料(例如金属或聚合物基材料)和和一层包含一焊接区(2)的热塑性材料，所述焊接区(2)沿所述包装材料的移动方向延伸；所述焊接设备包括一交流电流发电机、一将交流电流转变成磁场的线圈(3、5、6)、一使磁场的磁力线沿确定的方向导通的铁磁元件(7、8、10-13)，磁场取向成穿过包装材料(1)，用于感应加热所述能用电磁感应加热的层；所述焊接设备的特征在于，它包括一组铁磁元件(7、8、10-13、19-21)，所述铁磁元件配置成使磁场的磁力线在沿所述焊接区(2)定位的至少两个不同的区位(14、16-18)中穿过所述包装材料(1)。
正如下面将要看到的，分两个不同区位局部加热是特别有利的。
根据本发明的一种优选实施方式，第一铁磁元件置于包装材料一侧，例如在成形时的包装内面一侧。第一铁磁元件配置使其两端都处在两加热区位的附近。在这些端部的延长区内，但在所述包装材料另一侧，分别有一第二铁磁元件和一第三铁磁元件，其中一端部位于加热区附近。由此可得出，在加热区位的环境下，这些磁场的磁力线被导集。
根据本发明的一种特别有利的实施方式，可用第四铁磁元件将第二和第三铁磁元件彼此连接起来，线圈绕第二铁磁元件、或者第三铁磁元件、或者第四铁磁元件，如此配置的所有元件构成了一铁磁回路，从而导集线圈感应产生的这些磁场回路。
应该指出，与US 3 242 300描述的现有技术中的设备相反，该设备的加热区位按照曲线展开，而本发明的设备涉及加热两个不同的区位。这种实施方式意味着其移动时，包装材料在其焊接区进行第一次加热，接着中断，再进行第二次加热。
为了证明“缓和”区的意义，可以比较两个加热设备的设计思路，第一种加热设备，如US 3 242 300公开的加热设备，只有一个沿长度L延伸的加热区位，第二种加热设备，根据本发明，有第一加热区位(长的)L1，接着一中断区位(长的)L2和一加热区位(长的)L3。
第一种设备定义如下：
-L＝60毫米
-将从感应线圈出来的铝板温度固定在140℃。实验上，这属于调整感应线圈提供的功率。
第二种设备确定如下：
-L1＝30毫米
-L2＝30毫米
-L3＝30毫米
-第二种设备提供的功率与第一种设备提供的功率相同(相同的生产线速度)。
待焊接板主要有三层：
-聚乙烯/铝/聚乙烯
-150微米/12微米/75微米
  速度(米/分钟)   在第一种设备出口处的待焊接界面的温度(℃)     在第二种设备出口处的待焊接界面的温度(℃)
    20     138     139
    40     126     135
    60     111     124
    80     103     117
移动速度越高，它提供热能就应该越快。铝板几乎-瞬间被加热。相反地，速度高时，该聚合物层沿其厚度加热不均匀(聚合物中热扩散是比较缓慢的)。临时的“缓和”区(L2)能使铝层的热量扩散到聚合物中，因此能降低这些铝层与待焊接界面之间的热梯度。
附图说明
以下借助附图描述本发明的几个非限制性实施例。
图1示出本发明第一个实施方式的前视图。
图2示出本发明第二个实施方式的前视图。
图3示出图2实施方式沿线III-III的横剖面。
图4示出本发明第三个实施方式的前视图。
图5示出根据本发明另一种实施方式的焊接杆横剖面。
具体实施方式
每个图的每个相同元件采用相同的参照号。
图1示出在加热设备中移动的管1。管1从一种绕在一焊接杆23周围的板片制得，该板片的边重叠起来，并在它们穿过加热设备行进时受热焊接。管1的壁由至少一层金属和一层热塑性材料构成。如前面所指出的，感应产生热量的Foucault电流必需要有金属层，这种热可用于熔化一部分热塑性层，于是保证了焊接。
在这个实施例中，焊接区沿管1移动方向延伸。
该加热设备包括第一铁磁棒7，例如铁氧体棒，它插入焊接杆23中，置于在焊接区2端的管1内侧。第二铁磁棒8和第三铁磁棒10置于第一铁磁棒7上面，以便第二铁磁棒8的一端位于第一铁磁棒7一端延长部分中，并且第三铁磁棒10的一端位于第一铁磁棒7另一端部延长部分中。第二8和第三铁磁棒10每个都绕了线圈3、5。
成U形的三个铁磁棒7、8、10的配置使得能获得在区位14、16处的一基本局部的加热，在第一铁磁棒7端与第二铁磁棒8端之间形成第一个区位14，在第一铁磁棒7另一端与第三铁磁棒10端之间形成第二个区位16。这两对端部之间的距离可以是待焊接包装板厚度的2-200倍，优选地2-50倍。
因此，对于在其焊接区2的管1上的点，在第一铁磁棒7端与第二铁磁棒8端之间的区位14进行第一次加热。在此停止一段时间后在第一铁磁棒7另一端与第三铁磁棒10端之间的区位16进行再加热。
图2-4示出的设备与图1设备类似。但是，它们的不同之处在于整个铁磁元件构成了封闭回路，磁场的磁力线因此向它们的整个回路集中。
与管1移动方向平行安装的第四铁磁棒13将第二铁磁棒11与第三铁磁棒12彼此连接起来，第四铁磁棒13绕有线圈6。
线圈6还可以安置在第二铁磁棒11或第三铁磁棒12周围。
图4说明的设备与图2说明的设备唯一不同之处在于，在管1壁各侧交替安装了一组3个铁磁棒19-21，代替第一铁磁棒7，铁磁棒19-21的端部两两重叠。
现有技术的焊接杆往往是由绕有塑料套筒的钢芯组成。
焊接杆23中有铁磁棒(7、19、21)，当然能够使最大部分磁场的磁力线集中于铁磁棒内。
但是会遇到一些磁场的磁力线也移动到塑料套筒中，因此降低了在焊接区的加热性能。
为了减少，甚至消除这种缺陷，焊接杆23可以专门由例如铜或铝之类的可形成屏蔽的材料构成。
选择性地(参见图5)，这种杆可以包括钢芯26，它绕有塑料套筒25，套筒25本身绕有铜或铝套管24，铁磁棒(7、19、21)只是置于外套管24中和塑料套筒25中。达到的效果与前面图的情况相同，即铜或铝元件对磁场的磁力线起屏蔽作用。
应该指出，本发明可应用于任何的薄板(laminé)，它包括至少一层金属板(例如铝板)和一层热塑性材料板。
作为可以使用的非限制性薄板实例，可以列举下述组合(从管外到管内描述)：
1)厚度130微米的聚乙烯(白色)-厚度27微米的聚乙烯(白色)-厚度16微米的共聚物(白色)薄膜-12微米铝板-厚度30微米的共聚物(透明的)-厚度60微米的特制聚乙烯薄膜(透明)。
2)厚度90微米的聚乙烯(白色)-厚度65微米的共聚物(白色)-厚度40微米的铝板-厚度40微米的共聚物(透明)-厚度75微米的特制聚乙烯(透明)。
3)厚度110微米的聚乙烯(白色)-厚度45微米的共聚物(白色)-厚度40微米的铝板-厚度40微米的共聚物(透明的)-厚度75微米的特别聚乙烯(共挤出的)。

Claims (8)

1、一移动的包装材料(1)的焊接设备，所述包装材料包括一层能采用电磁感应加热的材料和一层包含一焊接区(2)的热塑性材料，所述焊接区(2)沿所述包装材料的移动方向延伸；所述焊接设备包括一交流电流发电机、一将交流电流转变成磁场的线圈(3、5、6)、一使磁场的磁力线沿确定的方向导通的铁磁元件(7、8、10-13)，磁场取向成穿过包装材料(1)，用于感应加热所述能用电磁感应加热的层；
所述焊接设备的特征在于，它包括一组铁磁元件(7、8、10-13、19-21)，所述铁磁元件配置成使磁场的磁力线在沿所述焊接区(2)定位的至少两个不同的区位(14、16-18)中穿过所述包装材料(1)。
2、按照上述权利要求所述的设备，其特征在于，第一铁磁元件(7)设置在所述包装材料(1)一侧附近，从而它的每个端部分别处在所述不同区位(14、16-18)中的一个或另一个附近，且一第二铁磁元件(8、10-12)和一第三铁磁元件(8、10-12)设置所述包装材料(1)的另一侧，以便第二铁磁元件的端部中的一个位于所述不同区位(14、16-18)的其中一个附近；并且所述第三铁磁元件的端部中的一个位于所述不同区位(14、16-18)的另一个附近。
3、按照上述权利要求中任一项所述的设备，其特征在于，所述的置于所述待焊接层两侧和附近的三个铁磁元件(7、8、10)的端部相隔一距离，所述距离为所述待焊接层厚度的2-200倍，优选地为2-50倍。
4、按照权利要求2或3所述的设备，其特征在于，所述第二铁磁元件(8、10-12)和所述第三铁磁元件(8、10-12)绕有一线圈(3、5、6)。
5、按照权利要求1所述的设备，其特征在于，多个铁磁元件(19-21)交替地配置在所述包装材料每侧的附近，以便一铁磁元件(19-21)的每个端部位于另一个铁磁元件的端部(19-21)的上面或下面。
6、按照上述权利要求中任一项所述的设备，其特征在于，这组铁磁元件(7、8、10、11、19-21)构成一铁磁回路，一线圈(6)包围着一铁磁元件(7、8、10、11、19-21)。
7、按照上述权利要求中任一项所述的设备，其特征在于，它包括一个或多个置于不相邻铁磁元件(7、8、10、11、19-21)之间的磁屏蔽。
8、按照上述权利要求中任一项所述的设备，其特征在于，一部分铁磁棒(7、19、21)置于一焊接杆23中，所述焊接杆23包括一屏蔽元件，例如一铜或铝屏蔽元件，所述屏蔽元件配置成使这些磁场的磁力线限导于铁磁棒(7、19、21)内。
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