Dec. 09, 2024
Machinery
When making the decision to purchase a new slitter rewinder, it can be an exciting process for companies both large and small. However, selecting the right machine specification can become convoluted and difficult with all of the various manufacturers, machines styles and features. Knowing which machine is right for the application may not be clear. To help provide clarity, use these three basic questions to help define the right machine for the application.
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The general rule is that if the slit widths are greater than 1&#; (25mm), a center-wind slitter rewinder is recommended. If the slit widths are less than 1&#;, a center-surface slitter rewinder is a better fit for the application.
With wider slit widths, the materials are more stable, making the center-winder a great choice with its simple design, good ergonomics and cost effectiveness.
At narrower slit widths, the slit material is more vulnerable to effects such as flutter and caliper variation which impact finished roll quality, especially at larger rewind diameters. The center-surface machine provides the most support from the slitting section to the rewind, minimizing these negative effects and ensuring good quality results.
The maximum roll diameter and weight will, again, help determine if the slitter should be center-wind or center-surface wind.
For roll diameters under 32&#; (800mm) a center-winder is generally an excellent choice. At 40&#; (mm) diameter, some machine manufacturers may offer both, depending on the application. Above 40&#; maximum rewind diameter, a center-surface slitter would be the better choice.
Most manufacturers have a maximum rewind diameter of either 32&#; (800mm) or 40&#; (mm) for their duplex center-wind slitters. This is due to a combination of tension control, weight of the finished rolls on the shafts and the overall ergonomics.
The 3 most common types of slitting are:
Each has their benefits, and its important to understand which type works best for the materials. If the material mix is quite broad, consider having more than one slitting type. Many machines will have at least two. For instance, if the machine is to slit an adhesive laminate and a thin film, the machine should likely have shear and razor for the laminate and the film, respectively.
There are still several additional questions that will need to be answered when determining the right machine, but these three main questions are an excellent starting place to help narrow the project scope.
It&#;s one thing to consider a single manufacturing process&#;but what about two processes that work hand in hand? You need something like a slitting and rewinding machine for that. Let&#;s dive in!
Further reading:
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As you familiarize yourself with the slitting and rewinding machine, become familiar with one word in particular: converting. In regards to this process, converting means slitting. Typically, we use converting equipment like foils, paper, and film. These materials often come in roll form. When we apply the slitter machine, we&#;re able to cut them into narrow rolls. The narrower the roll, the easier it is to handle.
To make it simple, think of a slitting machine as its three main components. These include the unwind, the slitter, and the rewind. The slitter itself has an unwind. Usually, you&#;ll feed a large roll of material through the slitter&#;s unwind. This in itself is actually what causes the material to unwind in the first place. Subsequently, the machine slits the material into varying widths. It&#;s then rewound into different cores.
Think of it this way: when you feed material into slitters and rewinders, it enters in one form. The machine ensures that you receive it back in a simplified, more workable form. One of the benefits of utilizing this process is that these simplified materials may work better for different purposes.
Needless to say, a slitting machine requires direction. That direction comes from a slitting equipment operator. The operator is not only responsible for operating the machine, but setting it up and managing it in general. Additionally, we rely on the operator to check pre-determined tolerances. When the machine offers a final product, it&#;s up to the operator to inspect that product for any major flaws.
With that in mind, you&#;re putting a lot of trust into a slitting machine operator. This means you need to be sure about who you&#;re working with&#;or for that matter, outsource to a slitting factory. Companies like Conversion Technologies International offer processing services, which means you won&#;t have to hire or train a permanent employee. That saves you a lot of time, money, and stress.
We use a rewinding machine for a specific purpose&#;sometimes in conjunction with a slitting machine. The materials we&#;ve discussed often come in a roll form. Feeding that material through a rewinding machine, we&#;re able to work it into a smaller roll, or perhaps a roll in a somewhat different shape. Think of it this way: a rewinding machine also functions as a &#;reworking&#; machine.
Usually, what makes up this type of machine includes a series of different drums and rollers. These components take in the material, while a drive systems rotates them throughout the process. When a rewinding machine features slitting components or cutting systems, you have a slitting and rewinding machine.
As we mentioned earlier, the operator executes crucial functions with regards to these machines. Not only do they feed the material into the machine&#;they also set the winding parameters. These parameters determine the ultimate results of the machine&#;s work. They include the width of the material, the size of finished roll, and the width of the final material. When the machine winds the material onto the component we call the &#;spindle&#; or &#;core&#;, the rollers and drums control the tension.
Remember: you&#;ll find multiple different types of rewinding machines. Among them are center winders, coreless winders, and surface winders. It&#;s important that you understand the type of project you&#;re considering ahead of time, as well as what you need from your final product. This will ensure that you find the right machine immediately.
Here&#;s the good thing about the slitting process: no matter what you need executed, you&#;ll likely find a process that matches your requirements. The main processes include:
With this process, we mount a razor blade onto a slitting machine, slicing the materials into targeted widths as they pass through. The conversion method can work quickly, by using razors placed on the bottom, or slowly, by using blades placed on the top. Usually, we use razor slitting when shearing thin layers, like films.
Usually, we use this process when we need layers of varying levels of rigidity and thickness. Here, we move the substrate between a solid rotating anvil and circular rotating knife or series of knives. This is actually the most common method of the three options. While it doesn&#;t suit every project, it does work for many.
The third method utilizes a two-part knife. We refer to the ends of this knife as the &#;male&#; end and the &#;female&#; end. The substrate passes through the two parts&#;that&#;s how we cut it. The benefit of this method is that it&#;s quite fast and converts different types of thin materials quite efficiently.
When working with a slitting and rewinding machine, you&#;ll want as much flexibility as possible. The better the machine you select fits your project, the easier it will be for you to make the project work to your roll processing specifications. The question is, where do you start? You may want to begin with a third-party slitting and rewinding manufacturer.
A third-party manufacturer handles projects beyond slitting and rewinding&#;you can also outsource for processes like die cutting. No need to buy a die cutting machine when you outsource to a responsible manufacturer!
Want to learn more? No problem. Contact CTI here or call us at 419-924-. We&#;re ready to help.
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