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Double roll shrink bundlers are relatively simple machines but may not be fast enough for many applications. Another limitation is the inability to run registered film. For club stores like Sams and Costco as well as products where the unit of sale is shrink wrapped, the ability to run registered graphics is increasingly important.

单卷捆队是一个解决方案。

单卷捆绑机使用单卷胶片，将碎片切成长度，将其缠绕在捆绑包上。

通常通过车道分隔线将产品整理到捆绑式爆炸中。这些图片显示塑料瓶在x 2长的3个长图中，形成六袋。瓶子分为3条车道（该机器中总共有6个车道，因为它一次运行2个捆绑包）。带有条形的载体链从车道上拉出一个六包装，并将其移至输送机的包装部分。

As the bottles are pushed onto the chain, the film is fed from below, onto the conveyor and cut to length. This places the leading edge of the film about 1/3 of the way from the leading edge of the bundle as seen here.

As the bundles are carried along the wrapping conveyor, a bar mounted on a rotating arm picks up the film below the conveyor, carries it up through the gap between infeed and wrapping conveyors, over the bundles and into the gap between wrapping and takeway conveyor.

The slack belts above the bundle help guide and straighten the film as it is wrapped.

当捆绑包从包装输送机转移到传送道输送机时，胶卷被拉起并在捆绑包下，重叠了电影的另一端。

The takeaway conveyor carries the film bundle to the shrink tunnel where the hot conveyor belt welds the overlapped portions of film and the tunnel heat shrinks the film into a tight conformal wrap.

Single roll shrink bundlers can run speeds up to 50 bundles per minute or more. When running 2, or even 3, across, they can achieve speeds over 100 bundles per minute.

L型杆收缩包装纸，有时称为L-bar密封剂，非常适合从单个产品到捆绑的一系列应用，速度从1分钟到每分钟1分到5-10个成品套餐。这部最常用的L型杆密封膜是清晰，薄，高光泽的胶片，可为任何包装提供优雅的外观。

角钢与op密封材料可以完全手册erator pulling the film and package forward and manually pulling down the L-bar. They can be semi-automatic with the L-bar pulled down when the operator presses a button and released via timer or they can be fully automatic including product loading.

By its nature, L-bar sealing allows a variety of product sizes to be run with little or no changeover between sizes.

关于L型杆密封的第一件事是电影。大多数薄膜以单层卷提供，任何折叠或形成都是由机器完成的。用于L型杆密封的膜通常将其纵向折叠的折叠量为一半。

Text BoxIn a simple, manual, L-bar sealer, the film is pulled manually from the roll, over a guide which opens it up. The leading edges of the film are sealed, forming a 2 sided (front seal, back fold) pocket. The product is placed into the pocket, against the back fold and front seal.

The film with product is pulled forward into the sealing area. The sealing jaw is in the form of an “L” giving this type of sealer its name. The sealing jaw is pulled down against the film. The cross bar seals the trailing edge of the package, cuts the package loose and seals the leading edge of the film for the next package. The longitudinal bar seals the package and cuts away the excess film.

The package or bundle is now wrapped on 6 sides and ready for the shrinking in the heat tunnel. The film is hermetically sealed. If sent to the shrink wrapper like this will trap the air inside forming a pillow rather than shrinking conformally. It is therefor necessary to make a pinhole in the film to allow air to escape. Some films are supplied with microperforations while others require a pinwheel or other device to perforate the films during wrapping.

Overwrapping machines wrap and fold a paper, foil or plastic film over a product. Instead of welded edges as in a shrink or flow wrapper, all edges are folded. Generally, the film used is not heat shrinkable, resulting in a bit of looseness. Occasionally a shrinkable film will be used to create a tighter, conformal, wrap.

褶皱和角落的最终结果是一种整洁的保护性和/或装饰性的覆盖物，展示了手工编织的礼物外观。一些产品专门用作营销工具，以在消费者的脑海中创造这种感觉。使用折叠覆盖的常见产品包括香水和化妆品，CD和DVD，扑克牌，雪茄和香烟，酒吧肥皂，纸片等。

许多收缩包裹捆绑包使捆绑包的末端部分打开，以“靶心”的形式被视为难看。提供6个边的封闭式密封的捆绑机可用，但即使这些都不是密封。收缩包裹的包裹需要使空气在收缩过程中逸出，以避免枕头效果。如果没有靶心，则需要打孔以使空气逃脱。

Overwrapping can provide a completely hermetic seal. This is advantageous with products that have a pronounced scent such as tea, candles or soap. It can also be advantageous in preventing the product from absorbing other odors or humidity from the storage environment.

Shrink film, in shrinking, can develop considerable force. This can deform or damage delicate products. Paper reams are usually overwrapped rather than shrink wrapped for this reason. Another issue with paper is that it can absorb or give up moisture depending on the ambient humidity. A sealed overwrap prevents this. Since the overwrap is a bit loose, in the event that the paper does absorb moisture and swell, the overwrap can handle it without the warpage that a tight shrink wrap might cause.

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Shrink bundlers, sometimes called shrink wrappers, combine several packages into a tightly wrapped bundle. They can also be used overwrap a single package.

Shrink wrappers use a special film that, when heated shrinks to as little as 50% of it’s normal size. This allows the bundle to be loosely wrapped in the wrapper then, when the bundle is passed through a heat tunnel, the film shrinks conformally to the bundle. Modern films are often strong enough to eliminate the need for trays or slipsheets.

电影可能是简单的，连续印刷的或印刷的。如果使用普通或连续印刷的膜，则可以使用相对简单的双卷包装器。

The double roll wrapper uses an upper and lower film roll with ends welded together to form a curtain. The packages are collated into the final bundle and staged in front of the curtain as shown here.

到位后，一个通常是气缸的推动器将束穿过窗帘：

捆绑包现在包裹在3侧。通常，这部电影比捆绑包更宽，并伸出了末端。

在下一步中，一对切割/密封刀片将膜的尾随部分捏在一起。这同时将胶卷焊接在捆绑面上，切开胶卷并焊接两端，改革窗帘。

包现在包裹在4国和conveyor carries it to the heat tunnel. In the tunnel, the film shrinks tightly around the bundle. The film overhanging the edges shrinks down around the ends of the bundle pulling it together lengthwise.

This leaves an open end which may be desirable for easier opening and to serve as a handhold for the consumer. If a full, 6 sided seal is desired, additional sealing jaws can be added to seal the ends.

根据机器设计，胶卷，包装和捆绑式配置，双卷包装器可以以每分钟25-30束的速度运行。当需要较高的速度时，可以通过安装多个上下胶片卷，一次可以一次运行2个或更多束。

收缩包装一世s an economical way of packaging. Film takes up a fraction of the warehouse space of board, costs less and is easier for the end user to dispose of. Reducing packaging materials makes the product more sustainable and environmentally friendly. It’s a good deal all around.

These machines are often called flow wrappers because of the way the product flows through them. Whatever you call them, they are popular because they are simple and make an attractive package. They can also be wicked fast with some flow wrappers operating at 300 packages per minute or more.

更常见的是，它们在50至150 ppm的范围内运行。它们可以手动喂食，但侵蚀使它们易于自动化。流动包装器制作的包装类似于我在上一段视频中讨论的垂直形式模具机器。垂直机器与果冻豆等宽片产品搭配得很好。他们做得不好，将产品保存，例如托盘中的cookie，整理。流动包装器做。

Film can be unregistered with no printing or repetitive printing as shown on the left. In this case the package is made to a specific length. In the case of registered graphics, as shown on the right, even small variations in length would result in out of place graphics. These films will need a registration mark and the machine will need to cut to the mark to keep the graphics in register.

Flow wrapper infeeds are typically a stainless steel tray with side guides to confine the product. A lug chain in the center of the tray pushes the product into the wrapper. An operator or automated feeder places the product between the lugs. Some, higher speed, machines use a series of servomotor conveyors instead of a lug chain. Sensors detect the product and vary the conveyor speeds to space and synchronize the product into the forming shoe. The film feeds off a roll through dancer rolls to control tension. As with all roll fed machines, proper tension control is critical to good performance. The film flows over a forming shoe in time with the lug chain to wrap around the product. Once in the shoe, the product is carried along by the film.

The film folds under and a pair of sealing wheels seal the film lengthwise with a fin seal. Finally, a sealing bar seals the training and leading ends of the package and cuts them apart. Sometimes cutting is forgone to make a continuous strip of packages. A takeaway conveyor carries them to the next packaging step. This is a variation on the typical flow wrapper. The film is fed from underneath, the product placed on top of the film and then the film is wrapped and sealed over the product. Here you can see the longitudinal sealing wheels which are normally hidden underneath.

在这台机器上，而不是上一台机器的旋转颚，而是使用更复杂的颌骨来提供延长的密封时间。

现在您知道如何流动。