A slitter rewinder is a machine used in the converting industry. The converting industry is an important part of manufacturing, and it’s especially relevant right now, as the U.S. is working to promote more onshoring of manufacturing and similar work.  The following is a guide to the converting industry and what the implications are, as well as more specifics about the slitter rewinder, also just known as a slitter.  1. The Converting Industry The term converting industry refers to manufacturing processes and practices that are used to process materials that come in thin layer form. Thin layer-formed materials can include textiles, paper, foil, plastic film, and materials that aren’t woven.  The materials are usually stored and then shipped in their roll form after being wound.  A roll of shipped materials can be just a few inches in diameter, or these materials can be many feet.  The material width can be a fraction of an inch to several feet wide.  Converting processes include painting, coating, and laminating. Other converting processes include slitting, which means making narrow rolls from wider roles, drying, die cutting, packaging, and extruding.  The processes can go from very slow speeds to high speeds of thousands of feet per minute. The processes can be high-tech and sophisticated, and they’re often pretty customized.  A material roll is usually unwound from its roll form in one layer, then they’re processed and rewound into a roll so it can be shipped or processed further. The single material layer is the web that flows through machines or a process.  Basically, the term converting in converting industry means a roll of material is processed and then converted into a roll of something else.  2. Web Handling Web handling is the engineering, equipment, and science that’s needed to bring flexible materials through the different required converting processes. The right kind of web handling, which can be done through the use of the right designed, engineered, and manufactured equipment, can make sure that webs are transported through their converting processes without any defects.  3. The Role of a Slitter Rewinder Slitter rewinders are used for some essential functions that help make the modern soft materials we know today. Slitter rewinders are machines that cut what’s known as a parent or master roll of material to a width that’s smaller.  The materials need to be cut smaller so they can go on to the next step in the production process. A slitter rewinder is a piece of equipment that’s found in a wide range of manufacturing facilities across many global industries.  The majority of these pieces of machinery are built for particular types of material, but they can also be modified, so they’re able to slit different materials.  Along with the roll specifications of the material, most manufacturers want machines that will slit specific materials when they’re choosing them. They also want to consider factors like how easy to use they are, their safety, floor space they would take up, and speed.  A master roll is made to be as large as it can be because that’s cost-effective, which is why it then needs to be slit to the right width.  4. Winding Type Slitter rewinders can be characterized and categorized based on winding type, including: – Center winding: This is the most common method to rewind materials that might have different levels of thickness throughout the roll’s width. The material will go through a nip and anvil roll where it’s then slit using the right method. At that point, it’s rewound onto a core. This rewinding method is used for materials like woven items, foams, foils, films, and tapes. It’s useful for materials that could be sensitive to higher tension settings and compression.  – Turret winding: The method is a variation of center winding. It’s an alternative that can help reduce machine downtime, so multiple shafts are used, and then the machine can keep slitting on an active shaft, while an operator or sometimes automated mechanisms will unload and then reset the finished shift. This method is meant to help reduce changeover times. It’s for consumer goods, paper items, tapes, and high-volume products.  – Surface winding: Also referred to as drum surface winding, in this method, the rewinding materials are usually large in diameter. Non-wovens and paper are the applications of surface winding.  – Center surface winding: in this method, there’s a combination of elements borrowing from traditional surface rewinding and also center winding. The applications for this method include materials that aren’t woven and are slit to a smaller width. As the diameter goes up, the rewinding center shaft will keep the tension.  5. How It Works There are three primary functions of a slitter rewinder which are performed in a fixed order. The process starts with the already rolled paper or material, and it has to be unwound so that it can go through the rewinder in one single layer. As it goes through the machine, it’s slit by one of many available cutting methods into strips of the right thickness.  After the material is slit to its market-ready dimensions, it’s rewound into a roll that’s then sellable.  The cutting can be done in different ways, primarily based on the type of material.  The oldest type of cutting is known as score cutting. With score cutting, the materials between a dull blade and hard surface are cut. This is used for adhesives like tape, with a dry and sticky side.  Another method is razor blade cutting, which tends to be the most cost-effective approach. This uses a blade positioned over the area where the sheet is fed. As the material goes through a drum or set of drums, it’s drawn against the blade.  The method can’t be used for heavy items, rigid materials, or abrasive materials.  Finally, there’s shear cutting which is the most accurate method, and it can be used with rigid, thicker, and heavier materials like laminates and foils. This uses two, typically rotating blades. The material is pulled between

Any business that does oil refinement or something similar must know about fluid catalytic cracking and fluid catalytic cracking units, which some in the industry abbreviate as FCCUs. We’ll go over both of those concepts in detail in the following article. What is Fluid Catalytic Cracking? Fluid catalytic cracking is part of the complex, lengthy gasoline production process. If you’re dealing with catalytic particles, you’ll soon discover that they convert long-chain, thick hydrocarbons. These come from crude oil. You’re trying to create gasoline from those because it’s profitable and beneficial for humanity. You’ll need what those in the industry call a riser line. There, you can refine the long-chain hydrocarbons by fluidizing them. You blow them upward at a very high velocity, and as they rise, they react. This produces a coke-coated catalyst. In your reactor, you’ll have two cyclone sets. These work on the hydrocarbons by feeding them into the regeneration section. An air grind fluidizes them. At that point, you can burn off the catalyst particles that you no longer need. The catalyst absorbs the excess heat, and you can control the cracking reaction safely and expediently. This is where FCCUs come into play. What is a Fluid Catalytic Cracking Unit? You’ll need a fluid catalytic cracking unit if you want to make safely refined gasoline and similar products. What you need to do is make sure to take care of these units if you have some in a warehouse or somewhere similar. You must keep a close eye on them because they can sometimes sustain damage during the gasoline refinement cycle. With these units, you’ll have refractory linings in the major vessels and transfer lines. If you look at them after heavy use, you may uncover damage. You can expect that with heavier use unless you examine these units after each refinement process. You must appoint an expert who can examine your FCCUs regularly. That way, you do not risk any costly and dangerous equipment malfunctions. How Can You Repair a Damaged FCCU? If you do see that you have a damaged FCCU, you’ll need to stop gasoline production while you repair it. Once you start learning about these units, you’ll soon find that they have six major components, any of which can potentially sustain damage with heavy use. The six components include the distribution rig, your overhead lines, the slide valves, the internal cyclones we discussed earlier, the regenerator, and the reactor itself. They’re all delicate and costly. If you look at your FCCU and see damage, you’ll need to bring in a company to repair it. Such companies do exist, but you’ll want to locate one that has an excellent industry reputation. You’ll also want one that does not charge an exorbitant price. When you look at an FCCU repair company’s website, you’ll want to see some evidence that they can do the job right. You might look for former client recommendations. You’ll also want to see what training their technicians received. Anyone who examines and tries to fix your FCCU must know what they’re doing. If they don’t, and they’re only faking their credentials, they might make the situation worse and endanger your workers. They can also cost you more production time if they make the unit worse instead of better. What Else Do You Want from Your FCCU Repair Company? When you contact a company to repair your FCCU, you’ll also want one that knows about all the potential problems that these units can develop as time passes. For instance, the company you hire should know how to fix a unit with silica mitigation issues or independent anchoring system problems. You might want a company that can do some IDA and stud welding. You may need hexavalent chrome mitigation instead. Some businesses that do this kind of refinement need hydro-demolition, so the company you hire should know all about that as well. You should know very quickly when you talk to a company representative whether this business entity can repair your FCCU and get it up and running again. They’ll know all the appropriate terminology and have the latest tools and techniques mastered. You can’t fake this knowledge. Additional Requirements As you’re narrowing down the list regarding who should repair your faulty or damaged FCCU, you’ll need to think about availability as well. Maybe someone in your area can fix your FCCU, but they have a long wait time because they’ve got other clients in line ahead of you. That probably won’t work for you. Remember that as a refinery or an entity that uses FCCUs, you probably want to get back to work as soon as possible. If you have to wait weeks for the repairs and new components you need, that won’t do you much good. The repair company you hire should also have the parts you need on hand. If they need to wait for weeks to get someone to ship them those parts, you’ll probably have to go with someone else. Finally, you should establish a rapport with the company you hire. You and the techs they send over won’t be best friends, but they need to have a positive attitude. If you get someone surly who doesn’t seem to want the job, that won’t work. You’re giving this company an opportunity and probably paying them well to get your FCCU up and running again. They should appreciate that and respect you. If they don’t, you should go with another company that can give you prompt service, a fair price, and also has excellent customer service and response time. Once you find a company to service your FCCUs, you might use them for many years to come. If you’re constantly using those FCCUs for refining, you’ll likely need service for them periodically.  You can call the entity you use and get them to send someone every time you need that service. Your two companies can benefit from each other over the years.