Learn about Slitting Process, Roll Slitting and Slitter Rewinder
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Get a comprehensive understanding of the importance of slitter machines in the manufacturing industry and how slitting, roll slitting and slitter rewinder works. Learn about different types of slitter blades and how to improve the efficiency and speed of slitting process.
The manufacturing industry is constantly evolving and advancing, and one of the key pieces of equipment that helps to keep it running smoothly is the slitter machine. Slitter machines, also known as slitting machines or rotary slitting machines, are used to cut large rolls of materials, such as paper, film, and metal, into smaller rolls. This process is known as slitting, and it is a crucial step in many manufacturing operations.
Slitter machines, also known as slitting machines or rotary slitting machines, are used to cut large rolls of materials, such as paper, film, and metal, into smaller rolls. This process is known as slitting, and it is a crucial step in many manufacturing operations.
Importance of precision
One of the most important aspects of a slitter machine is its precision. These machines must be able to accurately and consistently cut materials to the desired width, without causing any damage or defects. This is why the quality of the slitter blade is so important.
Types of slitter blades
The slitter machine’s blades are made from a variety of materials, such as high speed steel, carbide, and ceramics, each with their own properties that suit for specific material. Each blade is designed to handle a specific type of material and must be regularly maintained to ensure optimal performance.
Another important aspect of slitter machines is their speed and efficiency. These machines must be able to quickly and efficiently process large volumes of material in order to keep up with the demands of the manufacturing industry. This is why many slitter machines are now equipped with advanced technologies, such as automation and computerized controls, to help increase their productivity and performance.
Slitter rewinder machine plays an important role in roll slitting process, this machine rewind the slitted rolls into smaller sizes. To learn more about the slitting process and how it works, check out this article on our website.
In conclusion, slitter machines play a vital role in the manufacturing industry. They are used to convert large rolls of material into smaller sizes, and their precision, speed, and efficiency make them an essential piece of equipment for any manufacturing operation. It’s important to have a well-maintained slitter machine with high-quality blades, as well as to take advantage of advanced technologies to stay competitive in the market.
In the converting industry, one of the most important processes during production is slitting. Slitting refers to converting large, heavy rolls of soft and flexible materials, such as film, foil, plastics, technical textiles, and paper, into narrower strips for further processing. A slitting machine or slitter is used to create nice and clean cuts and finish the slitting job. Since accurately and precisely slitting soft materials is challenging, it is vital to choose the right type of slitting as well as proper slitting blades. Konetool is an experienced supplier of tungsten carbide slitting blades. Today, we will share our practical experience in slitting and explain the definition, machine, types of slitting, and slitting blades that are mounted on the slitting machines.
When it comes to converting, slitting is too familiar to everyone in this industry. Why is slitting so crucial? These flexible materials are initially manufactured into heavy and large rolls for easy shipping and storage, which are also called parent rolls or master rolls. Parent rolls need to be cut into small sizes to meet production requirements. Slitting is a perfect method to finish the task. Through slitting, master rolls are converted into small and narrower strips.
Slitting is suitable for processing a wide range of soft materials, including paper, films, foils, fabrics, textiles, leathers, vinyl, plastics, tapes, and more. It is widely used in various industries, like packaging, automotive, food processing, medical, and recycling.
Log slitting and rewind slitting are two important types of slitting. As the name implies, rewind slitting refers to unwinding the master rolls, slicing the unwound long sheets, and then rewinding the narrower rolls. Log slitting, however, is cutting the parent roll directly without the unwinding step. The following is a detailed explanation.
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To begin with, the operator loads a heavy, large roll of flexible material onto a log slitter. We call this wide roll a “log roll” because it looks like a large tree trunk. A log slitter is also called a “lathe slitter” or “baloney slicer” since its working method resembles a lathe. The log roll is loaded onto a spinning mandrel horizontally. Then, a circular blade starts slitting the roll into the required widths. This is the process of log slitting.
Log slitting is ideal for cutting different soft materials such as tapes, PVC, papers, foams, tissues, films, and foils.
There are three types of rewind slitting: razor slitting, shear slitting, and crush cutting.
A. Razor slitting
Razor slitting employs a sharp blade or multiple blades (called industrial razor blades) to cut the material. The blade is held by a blade holder to stay stationary on a slitting machine. When the material passes through the razor blade, the slitting job is done.
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Type: Two types of razor slitting methods are frequently used that are razor-in-air and razor-in-groove. The blade is placed on top of the material without any support in the former method. In the latter, the blade is mounted at the bottom with a grooved roll supporting the slitting job. Razor-in-groove slitting requires a higher running speed than razor-in-air slitting.
Material: Best for thin, light, non-abrasive substrates, including thin films, light foils, tapes, plastics, vinyl, and ribbons.
Advantage: Economical, clean, easy to set up and maintain.
Disadvantage: Not suitable for cutting heavy, abrasive woven materials; Limited cutting speed; Generating more heat.
B. Shear slitting
The mechanism for shear slitting is like a pair of scissors which is quite simple to understand. Two circular knives move in a scissor action that is called “male knife” (top mounted) and “female knife” (bottom mounted). Correctly setting up the rotary knives to create an appropriate nip point is crucial, or the blades will easily wear.
Material: Best for thick films, foils, metal sheets, laminates, and composites.
Advantage: Accurate and precise cuts; Relatively high speed; Generating less heat and dust.
Disadvantage: Expensive, difficult to set up.
C. Crush cutting
Crush cutting, or score slitting, is a traditional slitting method and is the most frequently used. It can deal with materials of various thicknesses and hardness. The parent roll is loaded onto a rotating anvil roll or crush roll, and a rotating circular knife (or multiple knives) is pressed against the roll to cut the material.
Material: Best for pressure-sensitive adhesives, tough and thick non-wovens, laminates, tapes, rubber, fabrics, and more.
Advantage: Economical, easy to set up and maintain.
Disadvantage: Low-quality and less precise cuts; Limited cutting speed; Generating more dust.
Material being cut is the most important factor to consider. For example, if you are going to slit thin substrates, use razor slitting. Thick and pressure-sensitive materials should be processed through crush cutting.
Besides, do you work with professional converters? Log slitting, razor slitting, and crush cutting are easy to set up and maintain. However, shear slitting is difficult to set up and requires more professional knowledge.
The slitting results are also significant. Shear slitting creates more accurate and smoother cuts compared to other slitting types.
Another factor is the runtime. If the runtime of your machine is very long, use shear slitting because it creates less heat and dust.
Last but not least, your budget. Shear slitting is more expensive than other types of slitting. Therefore, you should select a slitting type that is under your project budget.
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