CN102216054A - 用于检测密封条施加到食品包装材料的幅带上的位置的设备和方法 - Google Patents

用于检测密封条施加到食品包装材料的幅带上的位置的设备和方法 Download PDF

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Publication number
CN102216054A
CN102216054A CN2009801458940A CN200980145894A CN102216054A CN 102216054 A CN102216054 A CN 102216054A CN 2009801458940 A CN2009801458940 A CN 2009801458940A CN 200980145894 A CN200980145894 A CN 200980145894A CN 102216054 A CN102216054 A CN 102216054A
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width
sealing strip
cloth band
band
cloth
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CN102216054B (zh
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A·多拉蒂
R·安萨洛尼
R·格拉马齐奥
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Tetra Laval Holdings and Finance SA
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Tetra Laval Holdings and Finance SA
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    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
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Abstract

本发明描述了一种用于检测热密封塑性材料制成的密封条(7)施加到食品包装材料的多层幅带(3)上的位置的设备(10，10′)，所述幅带沿预定路径(P)前进并且包括用于提供硬度和强度的至少一个基层和一个或多个热密封塑性层；所述密封条(7)具有施加到幅带(3)的纵向边缘(8)上的第一纵向部分(42)和从纵向边缘(8)横向伸出的第二纵向部分(43)。所述设备(10，10′)包括光源(45，45′)，其构造成在幅带(3)沿其路径(P)运动期间照射幅带(3)的横向部分；以及传感器(46，46′)，其在使用中检测与形成幅带(3)和密封条(7)的材料对曝光的不同特性相关的量(I，F)，并产生与密封条(7)的第二部分(43)的沿方向(X)的宽度相关的输出信号(W)，所述方向(X)垂直于幅带(3)的行进方向并平行于幅带(3)。

Description

用于检测密封条施加到食品包装材料的幅带上的位置的设备和方法
技术领域
本发明涉及一种用于检测密封条施加到食品包装材料的幅带上的位置的设备和方法。
背景技术
公知果汁、巴氏杀菌或UHT(超高温处理)奶、酒、番茄酱等多种食品以由杀菌包装材料制成的包装出售。
这种包装的典型示例是称为Tetra Brik Aseptic(注册商标)的液体或灌装食品用的平行六面体形包装，其通过折叠并密封包装材料的叠层幅带制成。
所述包装材料具有多层结构，其大致包括：
用于提供硬度和强度的基层，其可由纤维材料(例如纸)层、或者填充有矿物的聚丙烯材料层限定；以及
覆盖基层两侧的多层热密封塑性材料，例如聚乙烯膜。
在用于长期保存的食品(例如UHT奶)的无菌包装的情况下，包装材料还包括阻气材料和阻光材料层，例如铝箔或乙烯乙基醇(EVOH)膜，其叠置在热密封塑性材料层上，并且继而被形成最终接触食品的包装内表面的另一热密封塑性材料层覆盖。
众所周知，这类包装是在全自动包装机上生产的，在所述包装机上由幅带供给的包装材料连续地形成管。更具体地说，包装材料幅带从卷轴上展开并被供给通过包装机上的无菌室，在无菌室中例如通过施加诸如过氧化氢的杀菌剂来杀菌，所述杀菌剂随后通过加热和/或使所述包装材料经受适当波长和强度的照射被蒸发。然后，如此被杀菌的所述包装材料幅带保持在无菌空气环境中，并且通过多个成形组件竖直地供给，所述成形组件与所述包装材料相互作用以将其从幅带状逐渐折叠成管形。
然后，用杀菌过的或杀菌处理过的食品填充所述管，将其密封，并以等距截面切割成枕形包包装，随后利用机械方式对这些枕形包包装进行折叠而形成平行六面体形的包装。
在到达成形组件之前，所述包装材料幅带被供给通过用于施加热密封塑性材料的密封条的设备，随后所述包装材料热密封在所述密封条上以形成竖直管。
更具体地，所述密封条通常在按压操作台处热密封到所述包装材料幅带的内塑性层，预先加热的包装材料幅带和密封条沿不同的路径供给到所述按压操作台，且在此处所述密封条被按压到所述包装材料幅带的第一纵向边缘上。在施加后，所述密封条具有热密封到所述幅带的第一纵向边缘的第一部分、以及由此伸出的第二部分。
在与所述成形组件相互作用时，所述幅带的所述第二纵向边缘相对于形成的所述管的轴线位于所述第一纵向边缘的外侧。更具体地，所述密封条完全位于所述管内部，而面向所述管的轴线的第二纵向边缘的面被部分地叠置在所述密封条的第二部分上，并且部分地叠置在位于所述密封条的与所述第一部分相对的一侧的第一纵向边缘的面上。
已知上述类型的设备中第一和第二纵向边缘被热密封以沿所述管形成纵向密封。更具体地，热密封操作包括在没有密封条时加热所述第二纵向边缘的加热步骤、以及压缩所述密封条和所述纵向边缘的加压步骤。
所述加热步骤融化所述第二纵向边缘的聚乙烯层，其通过传导将热传递至所述第一纵向边缘和所述密封条，以便融化所述第一纵向边缘的聚乙烯层和所述密封条的热密封材料。
在所述加压步骤，所述密封条和所述包装材料幅带的纵向边缘被按压在一起，以便所述密封条的热密封材料和所述纵向边缘的聚乙烯层完全混合并形成限定所述管的纵向密封的分子键。
所述密封条起到以下作用：
-防止包装材料的边缘形成纵向密封从而吸收所包装的制品；
-提高纵向密封区域的阻气特性；以及
-力强纵向密封。
为了正确地工作，所述密封条应相对于所述包装材料正确地定位。
因此，行业内认为需要连续且精确地控制所述密封条施加到所述包装材料幅带上的位置而不干扰包装机发挥作用。
行业内还认为需要在必要时调整上述位置而无需停止所述包装机，以确保将所述密封条正确地施加到所述包装材料幅带上。
发明内容
本发明的目的在于提供一种用于检测密封条施加到食品的包装材料幅带上的位置的设备，其设计成以简单且低廉的方式实现至少一个上述目的。
根据本发明，提供一种根据权利要求1所述的用于检测密封条施加到食品的包装材料幅带上的位置的设备。
本发明还涉及一种根据权利要求10所述的用于检测密封条施加到食品的包装材料幅带上的位置的方法。
附图说明
将参考附图，通过示例来说明本发明的两个优选但非限制性实施例，其中：
图1示出了包装机的立体示意图，所述包装机适于用包装材料幅带生产食品的密封包装，并包括根据本发明第一实施例的用于检测密封条施加到所述幅带上的位置的设备；
图2示出了用于将所述密封条密封到所述包装材料幅带上的图1的包装机的密封单元的放大立体图；
图3示出了图1的检测设备的第一放大立体图；
图4示出了图3的检测设备的第二立体图；
图5示出了在施加所述密封条后并且在经过图3和图4的检测设备期间所述幅带材料的放大俯视图；
图6是曲线图，其示出了在将所述密封条施加到包装材料幅带上的区域处及区域周围由图3和图4的检测设备测得的特征量的变化；
图7示出了根据本发明不同实施例的检测设备的放大立体图；
图8示出了在施加所述密封条后并且在经过图7的检测设备期间所述幅带材料的放大俯视图；以及
图9是曲线图，其示出了在将所述密封条施加到包装材料幅带上的区域处及区域周围由图7的检测设备测得的特征量的变化。
具体实施方式
图1中的数字1指示用于由包装材料幅带3连续地生产食品的密封包装2的包装机的整体，所述包装材料幅带从卷轴4上展开并沿成形路径P供给。
包装机1优选地生产可灌装食品(如经巴氏杀菌或超高温处理的牛奶、果汁、酒等)的密封包装2。
包装机1还可生产在生产包装2时是可灌装的而在包装2被密封后凝固的食品的密封包装2。这种食品的一个例子是部分奶酪，其在生产包装2时是融化的，而在包装2被密封后凝固。
所述包装材料具有多层结构，其大致包括：
用于提供硬度和强度的基层，其可由纤维材料(如纸)层或填充有矿物的聚丙烯材料限定；以及
多层热密封塑性材料(如聚乙烯膜)，其覆盖所述基层的两侧。
在用于长期保存制品(如经超高温处理的牛奶)的无菌包装的情况下，所述包装材料还包括阻气和阻光材料(如优选的是铝箔或甚至是乙烯乙基醇(EVOH)膜)层，其叠置在热密封塑性材料层上，并且继而由形成最终接触食品的包装的内表面的一个或多个热密封塑性材料层覆盖。
如图1所示，幅带3由导向构件5(如辊或类似物)沿路径P供给，并且相继通过多个工作站或设备，其在图1中示意性地示出：设备6，其用于将热密封塑性材料制成的密封条7(图2至图5和图7至图8中示出)施加到幅带3的相对纵向边缘8和9中之一8上；根据本发明的设备10，其用于检测密封条7施加到幅带3上的位置；成形设备11，其通过将幅带3绕轴线A折叠成筒以将幅带3的纵向边缘9叠置在纵向边缘8和密封条7上方来形成包装材料的管12；以及密封设备13，其热密封纵向边缘8和9以及密封条7从而沿管12形成与轴线A平行且间隔开的纵向密封部15。
如通常所知，包装机1还包括填充设备16，其用于连续地将杀菌过或杀菌处理过的食品灌装到包装材料的管12中；及钳型成形设备(未示出)，其夹紧、密封并沿等距截面切割管12以形成一系列包装2。
特别参见图2，沿着具有与幅带3的路径P共有的笔直部分C的路径S向施加设备6供给密封条7，密封条7在压力下沿所述路径P被热密封到幅带3的塑性层的纵向边缘8，所述塑性层形成最终接触食品的包装2的内表面。
更具体地，路径S除了包括与路径P共有的部分C之外，还包括与路径P的相邻部分平行的笔直的上游部分S1以及连接部分S1和部分C的倾斜部分S2。
施加设备6包括：按压装置18，其将密封条7按压到幅带3上并且限定路径P和路径S的共有部分C；以及热处理装置(本身已知且未示出)，其从按压装置18上游沿各路径S和路径P预先加热密封条7和幅带3。
按压装置18包括一对压力辊19、20，所述一对压力辊具有相应的平行轴线D、E，以相反的方向旋转，并且彼此相邻设置以限定小截面通道，密封条7和幅带3的包括纵向边缘8的部分通过该通道同时滚动。特别地，轴线D、E与幅带3平行并垂直于路径P、S的部分C，且垂直于幅带3和密封条7通过辊19、20的行进方向。
在按压装置18的区域，幅带3的相对纵向边缘9与具有垂直于轴线D、E和路径P、S的部分C的轴线F的导向辊28相互配合。
在优选的实施例中，压力辊19、20中之一19的直径比另一个20大得多，但是应注意，也可使用具有相同直径的辊。
在所示的示例中，密封条7绕较小直径的压力辊20并在导向辊22周围延伸，所述导向辊22具有与辊19、20的轴线D、E平行的轴线G，并且位于路径S的部分S1和S2的接合处。
辊20、22和28都安装在支撑结构23上，其允许调节：
在一侧的辊28与在另一侧的辊20、22之间沿着与轴线D、E、G平行的方向X的距离，该距离是所处理的幅带3的宽度的函数；以及
辊22沿着方向X相对于幅带3的位置，以及由此密封条7沿着方向X相对于幅带3的位置。
特别是，支撑结构23包括附接至机架(未示出)的C形水平框架24、以及从框架24悬吊的一对竖直支柱25、26；所述竖直支柱25、26中的一个25承载辊20、22，而另一个26承载导向辊28。
更精确地，框架24包括与轴线F平行的一对侧杆29、30以及横向构件31，所述横向构件31与轴线D、E、G平行且连接至侧杆29、30的各自前端，以在使用中被定位在面向幅带3的设计成形成包装2的内表面的一侧的位置。
支柱25、26的上端都可滑动地联接至相应的槽32、33，所述槽沿横向构件31设置并且与方向X和轴线D、E、G平行地伸长。这样，可在开始生产包装2之前手动调节辊20、22、28的位置，以便使支柱25、26之间的距离适应所处理的幅带3的宽度。同样以相似的方式(未示出)对辊19进行类似的调节。当已经确定了支柱25、26的沿相应槽32、33的上端的位置后，通过拧紧相应的螺母34而在那些位置上将支柱25、26锁定到横向构件31。
辊22的轴向长度比辊20小，并设置致动器装置35以沿方向X相对于辊20和幅带3调节辊22以及因此调节密封条7的位置；辊22沿方向X的移位需要通过辊20的轴向长度来限制，以便后者可将密封条7供给到幅带3上的施加区域。
致动器装置35包括电动机36以及插设在电动机36和辊22之间的螺钉组件37。
特别地，组件37包括设置在辊22的径向内部上的螺母38、以及联接于螺母38和电动机36的输出轴(未示出)的螺杆元件40。更具体地，螺杆元件40具有联接于支柱25底端的一端、有角度地联接于电动机36的输出轴的相对端、以及与螺母38的相应螺纹接合的中间螺纹部分41。由于与电动机36和支柱25的连接，阻止了螺杆元件40的任何轴向移位；因而，螺杆元件40绕其轴线的旋转必定产生螺母38的移位并因而产生辊22沿着方向X的移位，结果使得密封条7沿着相同方向相对于幅带3移动。
由于辊19、20、22和28的位置调节，使得只有密封条7的第一纵向部分42被按压装置18施加到幅带3的纵向边缘8上，而条7的另一纵向部分43从边缘8伸出，以便其在管12形成时最终被施加到幅带3的相对边缘9上。
如前面提到的那样，一旦管12和纵向密封部15形成，密封条7会在包装2内部的最终位置处阻止边缘8吸收食品，并且还提高了密封部15的阻气性能和物理强度。
参见图1和图3至图5，检测设备10沿路径P位于按压装置18的下游，并且基本上包括：光源45，其构造成照射连续移动的幅带3的横向部分；以及传感器46，其在使用中检测与形成幅带3和密封条7的材料对曝光的不同特性相关的量并且产生与密封条7的纵向部分43在方向X上的宽度相关的输出信号W。
在图3至图5所示的实施例中，光源45和传感器46都布置在幅带3的相同侧，并优选地结合在单个箱50中；在这种情况下，由传感器46检测到的量是由被照射的材料反射的光的强度I。
特别地，箱50安装在以常规方式附接至机架(未示出)的支撑框架51上。更具体地，支撑框架51包括一对横向的L形支架52，其在使用中布置在幅带3的相对侧；以及横杆53，其连接支架52的上端且沿方向X延伸并承载箱50。
如图3和图4所示，杆53和箱50面向幅带3的设计成最终限定包装2的内表面的一侧，并且密封条7施加在幅带3的该侧上。
箱50滑动地联接至杆53以便可以调节其沿方向X的位置；常规的紧固装置54允许将箱50在期望位置锁定在杆53上。
为了得到更好的检测结果，在幅带3的与箱50的相对侧设置反射面55；特别地，反射面55优选地具有矩形形状并且设置在由支架52的底部支撑的板56上，板56与幅带3平行且间隔开地延伸，并且面向其最终限定包装2的外表面的一侧。
在板56上的布置位置，反射面55具有相对于光源45由幅带3和密封条7覆盖的第一部分57；以及横向地从条7的纵向部分43突出并且面向光源45的第二部分58。
反射面55在方向X上的尺寸被选择成允许在具有不同宽度的幅带3上进行对密封条7的检测。
如图6所示，由传感器46沿幅带3的横向带(在曲线图中为空间S)检测到的反射光的强度I在反射面55的没有被其它材料覆盖的部分58处达到最高值I1，在密封条7的纵向部分43处达到最低值I2，所述纵向部分43以一定距离覆盖反射面55并由不透明材料构成，并且在幅带3的剩余照射区域达到中间值I3，所述区域由设置在其上的对反向光没有实际影响的密封条7的纵向部分42部分地覆盖。
图6曲线中的值I2允许识别密封条7的纵向部分43沿方向X的宽度S0，从而识别密封条7的部分42、43相对于幅带3的位置。
在包装机1工作期间由传感器46基于检测到的反射光产生的输出信号W是电流信号，其与密封条7的纵向部分43的宽度成比例。
电子处理单元60接收输出信号W，并包括将电流值转换成在操作者显示器62上示出的条宽值的转换装置61、以及控制装置63，该控制装置产生以下控制信号：
警报信号Y，当条7的纵向部分43的检测宽度超出可接受值的预定范围R，即其小于第一阈值R1或大于第二阈值R2时，产生该信号；
机器停止信号Z，当条7的纵向部分43的检测宽度在大于阈值时间间隔T的时间段超出范围R时产生该信号。
密封条7的纵向部分43的检测宽度小于阈值R1的情形的一个示例是当密封条7以过大部分(42)被施加到幅带3的边缘8上时；以完全类似的方式，密封条7的纵向部分43的检测宽度大于阈值R2的情形的一个示例是当密封条7以过小部分(42)被施加到幅带3的边缘8上时。
处理单元60产生的控制信号还可包括用于驱动电动机36的另一信号Q以便调节辊22相对于幅带3沿方向X的位置，并从而调节密封条7相对于幅带3沿方向X的位置；信号Q可与信号Y、Z结合使用。
在实际使用中，幅带3被从卷轴4上展开并沿路径P按图1所示的方向供给。
更具体地，幅带3由导向构件5沿路径P供给并通过相继的设备6、10、11和13。
在设备6处，在预加热材料以进行密封之后，密封条7的纵向部分42在压力下被施加到幅带3的最终面向包装2内部的边缘8的面上。通过按压辊19、20来执行这一步骤。一旦密封条7的纵向部分42被施加到幅带3的边缘8，纵向部分43就从该边缘伸出。
在紧靠按压装置18的位置，设备10连续地检测幅带3上的密封条7的位置。特别的是，由光源45产生的光束连续地照射幅带3的横向部分。接着，根据被照射的材料不同，所述光束以不同的强度被反射；特别的是，如前所述且在图6中清楚所示，由传感器46检测到的反射光的强度I在反射面55的部分58处达到最大值I1，在与反射面55间隔开的密封条7的纵向部分43处达到最小值I2，并且在部分地附接至密封条7的纵向部分42的幅带3的剩余照射区域达到中间值I3。
这样，能够确定不附接至幅带3的密封条7的纵向部分43的宽度。传感器46产生与检测到的条宽成比例的输出信号W。
当该宽度超出范围R时，处理单元60产生警报信号Y；而后，在这一阶段期间形成的包装2在循环结束时被废弃。
如果检测到的条在大于阈值时间间隔T的时间段超出范围R，则处理单元60产生机器停止信号Z。
处理单元60还可产生用于启动电动机36的控制信号Q以修改辊22沿方向X相对于幅带3的位置，并因此修改密封条7沿方向X相对于幅带3的位置；在这种情况下，只有当无法修正密封条7的位置时才产生信号Y和Z。
特别地，当产生信号Q时，电动机36使得螺杆元件40绕其轴线旋转而没有任何轴向移位；结果，螺母38沿螺杆元件40的螺纹部分41轴向地移动，并且沿方向X修改辊22的位置直到传感器46检测到的密封条7的纵向部分43的宽度回到范围R内为止。
接下来，幅带3通过成形设备11，在成形设备11中幅带3绕轴线A逐渐折叠成筒，以将纵向边缘9叠置在纵向边缘8和密封条7上方，并形成尚未纵向密封的管12；特别地，密封条7位于尚未密封的管12内部，边缘9相对于轴线A位于边缘8和密封条7的纵向部分43的径向外部，并且边缘8位于条7的纵向部分42的径向外部。
在密封设备13处，幅带3的边缘9被加热以融化聚乙烯层，通过传导将热从边缘9传递至边缘8和密封条7，以融化边缘8的聚乙烯层和条7的热密封材料。这样形成纵向密封部15。
在该步骤之后，杀菌过的或杀菌处理过的食品被连续地灌装到管12中，管12继而被夹紧、密封和沿等距截面切割以形成一系列包装2。
图7和图8中的数字10′指示根据本发明的不同实施例的检测设备。
检测设备10′与设备10类似，下面的说明限于二者的区别，如果可能，设备10和10′的相同或相应的部件使用相同的附图标记。
特别地，设备10′与设备10的区别在于光源45′和传感器46′被布置在幅带3的相对侧。在这种情况下，传感器46′检测到的量是通过密封条7和幅带3的不同材料的直射光的强度I′。
更具体地，传感器46′以与箱50相同的方式布置在支撑框架51上，而光源45′照射幅带3的最终限定包装2的外表面的一侧。
特别推荐该实施例用于冷冻制品的包装材料，其中没有阻隔层，而且基层由棕色纸制成，而这些可能会削弱基于反射光检测的方案的正常工作。
如图9所示，传感器46′检测到的直射光的强度I′在幅带3和密封条7的外侧达到最高值I1′，在那里光源45′直接照射传感器46′，在幅带3的被照射区域达到最低值I3′而不管有没有密封条7，在那里实际上光根本不通过，并且在密封条7的纵向部分43达到中间值I2′。
操作方式上，检测设备10′与检测设备10的区别仅在于检测密封条7的纵向部分43的宽度的方式，即通过直射光而不是反射光来检测。
根据本发明的检测设备10、10′以及检测方法的优点通过上述说明将变得清楚。
特别是，检测设备10、10′允许连续且精确地控制密封条7施加到包装材料的幅带3上的位置而不会干扰包装机1发挥作用。检测操作非常简单并且不需要复杂的计算或插值来确定密封条是否正确地施加到幅带3上。事实上，测量从幅带3突出的密封条7的纵向部分43的宽度直接给出了关于施加密封条的正确性的信息。
而且，来自传感器46、46′的输出信号W也可用作反馈以控制而不仅仅是监测幅带3上的条7的位置。
很清楚，可以在不偏离所附权利要求的保护范围的前提下对这里描述的检测设备10、10′及检测方法进行改变。

Claims (16)

1.一种用于检测热密封塑性材料制成的密封条(7)施加到食品包装材料的多层幅带(3)上的位置的设备(10，10′)，所述幅带沿预定路径(P)前进并且包括用于提供硬度和强度的至少一个基层和一个或多个热密封塑性层，所述密封条(7)具有施加到所述幅带(3)的纵向边缘(8)上的第一纵向部分(42)和从所述纵向边缘(8)横向伸出的第二纵向部分(43)，所述设备(10，10′)的特征在于包括：
光源(45，45′)，其构造成在所述幅带(3)沿所述路径(P)运动期间照射所述带(3)的横向部分；以及
传感器(46，46′)，其在使用中检测与形成所述幅带(3)和所述密封条(7)的材料对曝光的不同特性相关的量(I，I′)，并产生与所述密封条(7)的所述第二部分(43)的沿方向(X)的宽度相关的输出信号(W)，所述方向(X)垂直于所述幅带(3)的行进方向并平行于所述幅带(3)。
2.根据权利要求1所述的设备，其中所述光源(45′)和所述传感器(46′)布置在所述幅带(3)的相对侧，并且其中由所述传感器检测到的量是通过所述密封条(7)和所述幅带(3)的不同材料的直射光的强度(I′)。
3.根据权利要求1所述的设备，其中所述光源(45)和所述传感器(46)布置在所述幅带(3)的相同侧，并且其中由所述传感器(46)检测到的量是由被照射材料反射的光的强度(I)。
4.根据权利要求3所述的设备，其中其还包括反射面(55)，该反射面布置在所述幅带(3)的与所述传感器(46)和所述光源(45)的相对侧，且具有由所述幅带(3)和所述密封条(7)相对于所述光源(45)而覆盖的第一部分(57)和从所述密封条(7)的所述第二部分(43)横向突出并面对所述光源(45)的第二部分(58)。
5.根据权利要求4所述的设备，其中所述密封条(7)的所述第二部分(43)与所述反射面(55)的所述第一部分(57)间隔开。
6.根据权利要求2至5任一个所述的设备，其中对应于所述密封条(7)的所述第二部分(43)的光强度(I，I′)的检测值(I2，I2′)与对应于所述第二部分(43)两侧的检测值(I1，I1′，I3，I3′)不同。
7.根据前述任一权利要求所述的设备，其中其还包括控制装置(63)，该控制装置从所述传感器(46，46′)接收所述输出信号(W)，并且当所述密封条(7)的所述第二部分(43)的检测宽度超出可接受值的预定范围(R)时产生警报信号(Y)、和/或用于控制所述密封条(7)的供给装置(22)相对于所述幅带(3)的位置的控制信号(Q)。
8.根据权利要求7所述的设备，其中当所述密封条(7)的所述纵向部分(43)的检测宽度在大于阈值时间间隔(T)的时间段超出所述范围(R)时，所述控制装置(63)产生停止信号(Z)。
9.一种用于由包装材料幅带(3)生产食品的密封包装的包装机，其包括用于将所述密封条(7)施加于所述幅带(3)的施加设备以及前述任一权利要求所述的检测设备(10，10′)。
10.根据权利要求9所述的包装机，其中所述施加设备(6)包括密封装置(18)，其将所述密封条(7)密封至所述幅带(3)的所述纵向边缘(8)；供给装置(22)，其将所述密封条(7)供给至所述施加设备(18)；支撑装置(23)，其沿垂直于所述幅带(3)的行进方向的调节方向(X)将所述供给装置(22)支承在可调位置；致动器装置(35)，其能够被选择性地启动以沿所述可调方向(X)相对于所述幅带(3)将所述供给装置(22)移位至期望位置；以及控制装置(63)，其从所述传感器(46，46′)接收所述输出信号(W)并且产生用于控制所述供给装置(22)相对于所述幅带(3)的位置的控制信号(Q)。
11.一种用于检测热密封塑性材料制成的密封条(7)施加到食品包装材料的多层幅带(3)上的位置的方法，所述幅带沿预定路径(P)前进并且包括用于提供硬度和强度的至少一个基层和一个或多个热密封塑性层，所述密封条(7)具有施加到所述幅带(3)的纵向边缘(8)上的第一纵向部分(42)和从所述纵向边缘(8)横向伸出的第二纵向部分(43)，所述方法(10，10′)的特征在于包括下列步骤：
在所述幅带(3)沿所述路径(P)运动期间在所述幅带(3)的横向部分上产生光束；
检测与形成所述幅带(3)和所述密封条(7)的材料对曝光的不同特性相关的量(I，I′)；以及
产生与所述密封条(7)的所述第二部分(43)的沿横向方向(X)的宽度相关的输出信号(W)，所述横向方向(X)垂直于所述幅带(3)的行进方向并平行于所述幅带(3)。
12.根据权利要求11所述的方法，其中从所述幅带(3)的一侧产生所述光束，并且所检测到的量是通过所述密封条(7)和所述幅带(3)的不同材料并被在所述幅带(3)的相对侧的传感器(46′)接收的直射光的强度(I′)。
13.根据权利要求11所述的方法，其中从所述带(3)的一侧产生所述光束，并且所检测到的量是由被照射材料反射的光的强度(I)。
14.根据权利要求13所述的方法，所述光束在所述幅带(3)、所述密封条(7)和反射面(55)上被引导，所述反射面具有被所述幅带(3)和所述密封条(7)覆盖的第一部分(57)和从所述密封条(7)的所述第二部分(43)横向突出的第二部分(58)。
15.根据要求11至14任一个所述的方法，其中其还包括基于所述输出信号(W)产生以下信号的步骤：
警报信号(Y)，当所述密封条(7)的所述第二部分(43)的检测宽度超出可接受值的确定范围(R)时产生；和/或
控制信号(Q)，用于控制所述密封条(7)沿所述横向方向(X)相对于所述幅带(3)的位置。
16.根据权利要求15所述的方法，其中其还包括以下步骤：当所述密封条(7)的所述纵向部分(43)的检测宽度在大于阈值时间间隔(T)的时间段超出所述范围(R)时产生停止信号(Z)。
CN200980145894.0A 2008-11-18 2009-11-17 用于检测密封条施加到食品包装材料的幅带上的位置的设备和方法 Expired - Fee Related CN102216054B (zh)

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