Machine for rewinding rolled materials. Rewinding and slitting of rolled materials. For individuals
YOU CAN PAY FOR YOUR ORDER IN SEVERAL WAYS:
FOR LEGAL ENTITIES:
- Cashless payments for legal entities. We issue invoices without VAT. You can receive and pay an invoice by providing your company details. You can fill out the details yourself when placing an order on the website or send them to us by email. mail.
FOR INDIVIDUALS:
- By bank card online. After placing your order, we will send you an email containing a link to the bank card payment page. Calculations are made using the YandexMoney system.
- SMS code. After placing your order, we will send an SMS message to your mobile phone containing instructions for payment using the Sberbank Online system. (This payment method is available only to Sberbank clients. The phone number must be linked to the Sberbank Online system) This type of payment is possible for orders worth up to 10,000 rubles.
- Payment by Sberbank receipt. Our manager will prepare a receipt for you for payment at any Sberbank branch.
- By bank transfer for individuals. You can pay at any bank using the details from your account, including through your personal online account of any bank.
Please note that the customer, payer and recipient of the goods must be the same, that is, you cannot pay for your order using someone else's bank card, nor can you pay for someone else's order with your card.
When paying by bank transfer, keep in mind that banks charge a commission for transferring money. It can be up to 3% of the transfer amount. Check the cost of banking services with your bank.
YOU CAN RECEIVE YOUR ORDER IN SEVERAL WAYS:
1. Pickup from a warehouse in Moscow.
115516 Moscow, st. Promyshlennaya, 11, gate No. 14
2. Delivery within Moscow.
Courier delivery in Moscow for orders weighing up to 15 kg costs 800 rubles.
The cost of delivery of large and heavy goods is calculated individually. Delivery of large and heavy goods is carried out to the entrance; lifting to the floor is not carried out. Unloading is carried out by the customer.
3. Delivery to regions by DPD.
Delivery of orders is carried out throughout Russia, regardless of the remoteness of the region, including Crimea. Delivery is also carried out to the Republic of Kazakhstan and Belarus.
4. Delivery by other transport companies
If you want to order delivery through any other transport company, then when placing an order, indicate the company through which you want to send the goods.
Delivery to the TC pick-up point in your city or to your address is paid at the freight carrier's rates at the expense of the recipient of the goods.
Category: 1. ORDINARY WINDING MACHINESCNC open horizontal winding series PRIVATE SPECIAL WINDING MACHINE
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Rewinding and cutting of sheets of paper, film, foil or non-woven materials is required for compact storage, ease of transportation, subsequent processing and use of materials.
To wind rolls, rewinding and cutting machines are used, which wind the web layer by layer onto a sleeve or directly onto a shaft. When winding, the drive of the machine tensions the web and this tension creates pressure inside the roll, directed radially to the center of the roll and proportional to the tension, expressed in units of force per width of the web, and inversely proportional to the radius. This pressure in turn holds the layers together and provides friction between them. The friction between the layers will be proportional to the contact area and the coefficient of friction of the material. It is this that transmits the torque from the shaft (sleeve) to the upper layers of the roll and creates tension in the web during winding. Friction prevents the layers from slipping and thus maintains the shape of the roll during transportation and storage.
Web tension
Each canvas has unevenness in the transverse or longitudinal directions, visually the canvas looks “baggy”. By applying tension to the canvas, we strain it and remove these unevennesses and the canvas becomes more even. Then, under tension, the canvas becomes more rigid and this helps eliminate sagging, for example, between the shafts. Finally, tension creates friction between the layers after winding and helps to determine how many meters were wound in a certain period of time (knowing the speed, thickness and width of the material).
Figure 1. Main parameters of slitting machines
How to determine the correct web tension? According to practice, it is set as a maximum tension equal to 15-20% of the value corresponding to the breaking force of the material. For 90% of cases, the permissible tension lies in the range of 50-550 N/m, and in 95% of cases in the range: 20 to 2000 N/m. You can agree or disagree with the quantitative estimates given, but this is practice, and this will help when choosing a machine drive.
How to prevent slippage?
Low friction materials require more force to prevent slippage. The layers near the core have a more limited contact area than the layers on top of the roll. And narrow rolls will have a smaller contact area between the layers than wide ones and will require more tension.
What is Buildup factor?
Buildup factor is the ratio of the outer diameter of the sleeve to the final diameter of the roll.
For webs with relatively good compressibility in the transverse direction and a high coefficient of friction, this ratio can easily be achieved on the order of 10. Those. on a 152mm sleeve you can wind a roll with a diameter of 1520mm without difficulty and on almost any machine. But for materials with a poor combination of low modulus in the longitudinal direction, high radial stiffness, low coefficient of friction and poor flatness, difficulties begin already at a ratio of 3-4. This is one of the objective difficulties of winding large diameter rolls onto 76.2mm sleeves. If you change the winding shafts to larger ones, it will be easier to work.
What is Poisson's ratio?
When we apply tension to the canvas in one direction, it changes its shape and tends to become thinner in the other two directions. Poisson's ratio is a parameter that characterizes these changes.
The law states that for most materials the ratio is within 0.3%. For example, a PET sheet with a width of 1200 mm under tension stretches by 1% along its length. Poisson claims that this canvas will become 0.3% narrower in width, which will be approximately 3.6mm. This is important if you need to cut to an exact width.
Young's modulus
Young's modulus is the slope of the curve of the elongation of a sample versus the applied voltage.
Knowing the Young's modulus of wound materials is important if you encounter different materials when working, choose a new machine, or want to solve a problem. Each material has its own Young's modulus value and this parameter determines the behavior of the material on the rewinding and cutting machine, as well as whether the machine is suitable for a given material or not.
The range of changes in the value of Young's modulus in the reference literature is very large. If you work with a polyester sheet with an elongation of 0.2%, then a change in the diameter of the shaft by 0.1% with its diameter of 76 mm does not significantly affect the process, but if, with the same change in the diameter of the shaft, you work with an aluminum foil sheet with an elongation of 0.02%, then more likely You won't get all the good results. When winding tape onto rollers or using spreader rollers with soft surfaces, it is necessary to calculate the permissible level of change in the Young's modulus of the material. Relatively large changes in the diameter of the rollers can lead to slipping of the web and low efficiency of straightening the folds.
Another example of checking shaft alignment. For example, you have three sheets of PE, PET and aluminum foil with Young’s moduli of 100, 500 and 10000, respectively; with the same tension the sheets will give elongations of 1, 0.2 and 0.01%. If the error in alignment is 0.1 mm on a 1000 mm arm, i.e. 0.01%, then for PE this is almost not noticeable, because it turns out 1% + -0.005%, but for aluminum 0.01% + -0.005% will be very noticeable. Practice shows that shaft alignment, acceptable for most materials, except foil, is: 0.15-0.17 mm per meter.
How to calculate the length of the canvas in a roll?
Imagine the roll as a cylinder, which you look at from the end. The entire area of the end is occupied by wound material of thickness T. Then, using the formula for the area of a circle, we get Pi (Pp2 -Pg2)\T = Length. Conversely, if you know the thickness and length of the material, then the radius or diameter can be predicted. It is important to remember that by unwinding the fabric, you will relieve tension and the fabric will become shorter. Here Young's module will come to the rescue in order to communicate with the customer - with a length of 100 m and a stretch of 1%, the customer will miss a whole meter.
How not to make a mistake in the weight of the roll?
Physicists have a quantity they call density or weight per unit volume. You can forget for a minute that we have a sleeve, and there is emptiness in it and only then the material is wound.
Let our roll be a cylinder filled with water with a density equal to 1. Its volume multiplied by 1 will give the maximum weight of the roll for evaluation. Why maximum? Because PE has a density close to, but less than 1 (0.992-0.996) and all other materials are also less than one. Plus, when winding, there will always be layers of air in the roll, which will make it lighter. Usually you are interested in the maximum possible weight, and this can be quickly determined. For papers and cardboards, take the density equal to 0.72-0.76, for coated papers - 0.76-0.82.
The operator needs to know the weight of the roll in order to communicate with drive specialists. Otherwise, they may incorrectly estimate the moment of inertia and problems will begin.
Central rewinding machines
Center type rewinding machines are the most common type of rewinding machines. It is so called because the torque is imparted by the drive to the roll from the central shaft.
Central type machines must provide winding or unwinding of material in compliance with certain rules or, as they say, with a certain force moment profile. Rewinding occurs at a constant linear speed of the web, i.e. the formula is as follows: motor rotation in rpm = linear speed of the web in m m min X gear ratio u\pi, 2 and roll radius in m.
At the minimum radius, the rotation speed should be maximum. As the radius or diameter of the roll increases, the rotation speed must be reduced to maintain a constant linear speed. If, in this case, if the tension value is constant, then the moment T = tension multiplied by the radius. As the radius increases, the moment must increase. There are machines where there is no need to maintain a constant linear speed of the blade.
It is important to remember that winding and unwinding are carried out under direct control of the speed of the shaft in the center of the roll. When winding, the speed decreases with increasing radius, and when unwinding, the speed increases as the radius decreases.
Tension control
On machines, tension control is organized using feedback loops. First of all, you need to determine what is better to control, speed or torque. Then select the type of contour: open or closed. Then decide on the type of sensor to organize feedback in a closed loop. For example, it could be a ballerina or a shaft with strain gauges.
Open loop means that we have virtually no feedback, and we simply set a limit on some parameter. For example, on the force of the unwinding brake. Thus, tension is never measured in an open loop. This is a cheap method and is used if your process needs to control speed consistency, length or time factors, e.g. measured scalar parameters.
In closed loops, a so-called PID controller is used. A PID controller (proportional-integral-derivative controller) is a device in a feedback control loop. Used in automatic control systems to generate a control signal in order to obtain the required accuracy and quality of the transient process. The PID controller generates a control signal, which is the sum of three terms, the first of which is proportional to the difference between the input signal and the feedback signal (mismatch signal), the second is the integral of the mismatch signal, and the third is the derivative of the mismatch signal. But this is for machine gunners. It is important for operators that the machine understands what is happening and directly measures the given parameter. Often errors occur due to failures in PID controllers or their incorrect settings. If a static deviation appears, then look for the problem in the integral part of the PID, and if the desired value varies greatly around the set value, then in the differential part of the PID.
Vector or scalar drive
In both cases we are talking about frequency converters, although the terms "vector" and "scalar" are imprecise when applied to their characteristics. We are talking about an alternating current parameter, which means that the use of the term “scalar” is generally unacceptable.
From the course of elementary physics it is known that a scalar quantity is a quantity, each value of which (unlike a vector) can be expressed by one (real) number, as a result of which the set of values of the scalar can be depicted on a linear scale (scale - hence the name). With scalar (frequency) control, harmonic currents of the motor phases are formed, which means that the control is maintained at a constant ratio of the maximum motor torque to the resistance moment on the shaft. That is, when the frequency changes, the voltage amplitude changes in such a way that the ratio of the maximum motor torque to the current load torque remains unchanged. An important advantage of the scalar method is the ability to simultaneously control a group of electric motors. The scalar control method allows for easy adjustment, even when using factory settings.
Vector control is a method of controlling synchronous and asynchronous motors, not only by generating harmonic currents (voltage) of the phases, but also by providing control of the rotor magnetic flux (torque on the motor shaft). Vector control is used when it is necessary to obtain an extended range of frequency control; this can significantly increase the control range, control accuracy, and increase the speed of the electric drive. This method provides direct control of motor torque. Such control systems are more modern and more expensive. They are typical for high-quality rewinding machines.
How is belt speed measured?
In most cases, the principle of measuring the number of rotations of a shaft with zero slip and a known long circumference is used. Speed = 2 Pi RPM Radius. The length is simply determined by multiplying the speed by the time. On expensive machines, drive shafts, tachometers or linear encoders are installed to measure the speed of rotation of the shafts, as well as magnetic, inductive and/or optical sensors on cheaper models. In any case, it is important to ensure the tension of the web and its adhesion to the shaft. Remember, measurements on tensioned and unstretched fabrics will give a difference proportional to the degree of elongation under tension.
What angle of coverage of the strain gauge shaft should be?
The coverage angles recommended by manufacturers are always large, i.e. more than 45 degrees. But everything is relative. A canvas under high tension and a light shaft can also work at small coverage angles, which will be less than 45 degrees. But when working with canvases at low tensions, the coverage angle should be as large as possible. And also check that the measurement direction vector is perpendicular to the force of gravity.
Which ballerina is correct?
First of all, for a shaft to be called a ballerina, it must dance easily, i.e. practically fly and nothing should interfere with it. Reduce the inertia of the shaft, its weight, friction where possible, compensate for the influence of gravity and pneumatics, use predominantly horizontal systems, amplify the signal from the shaft, provide 180 degree coverage of the blade and sufficient length of the blade arms before and after the shaft. Check all this on your machine. The ballerina is sensitive to the folds of the fabric, it is difficult to adjust correctly, which leads to changes in the tension of the fabric, it does not respond well to rapid changes in tension, and does not measure tension directly.
Our capabilities:
Cutting any film materials with a thickness from 20 to 500 microns
Cutting foil and non-woven materials
Rewinding film materials from 6 and 3 inch cores
Maximum width of master rolls 1.8 meters winding length 12000 meters
Minimum cutting width 5 cm
High quality winding, operators have more than 10 years of experience
We work with material of any complexity
Fulfillment of orders with high quality and within strictly specified time frames
Our production is our pride. The needs of printers for lamination film in rolls of various widths and winding lengths and the desire to help our partners minimize waste when laminating products with various types of films led us to purchase the first slitting rewinder.
At the moment, production has grown into a separate line of activity and we cut film not only from our own supplies and to our partners in the printing market, but also take orders for cutting almost any film materials.
The film is wound and cut to suit YOUR production capacity. Core diameter, length and width of the lamination film roll – at your choice
The order execution time depends on the quantity and characteristics of the required rolls.
Winding is done on 1 and 3 inch bushings.
Lamination film in standard winding is always available in our warehouses.
For industrial laminators, thin film (20-27 microns) is wound, as a rule, 3000 meters long. Thick types of PET films - depending on your wishes.
BOPP and PET film for non-industrial (office) roll laminators, wound in the following sizes:
|
Lamination film thickness in microns |
Roll length |
|
|
Glossy Transparent Lamination Film |
20, 22 |
|
|
23, 24 |
||
|
Matte lamination film |
20, 23, 25, 27 |
|
These standard sizes (the correspondence of the film thickness to the footage in the roll) are offered as maximum for non-industrial roll laminators; film with a larger winding than indicated in the table will have a roll diameter larger than the technical parameters of the laminator. Film of larger winding is not installed on the laminator (the diameter of the roll will be greater than the distance between the guide on which the roll is attached and the laminated surface provided by the manufacturers of roll laminators).
The lamination film can be any width of your choice. The maximum width of a laminate roll is 1800 mm.
All lamination films are corona treated (electrical discharge treatment) and are ideal for varnishing, silk-screen printing, embossing and creasing.
Whatever products you are laminating, we will be able to offer you lamination film of decent quality. We value your time, your money and your nerves. And also your own time, money and nerves. We not only select and offer mutually beneficial working conditions specifically for your company, but we implement them.
You can come to our office with your printed materials and test any type of film that we sell on Geni-Lami roll laminators.
We have our own fleet of cars (cars and trucks). For large orders, delivery within Moscow is free!
To manufacturers of consumables!
If you need fast and high-quality cutting and rewinding rolled materials of specified sizes (non-woven, cotton wool), for further processing into finished products (wet wipes, wipes of non-standard sizes, etc.) - contact the company LLC "Emelyan Savostin".
Most materials used for production are produced in rolls of great length and width. Cutting and rewinding of rolled materials in our company is carried out on special machines that allow you to unwind rolls with a maximum diameter of 100 cm and a width of up to 120 cm and produce new ones with a diameter of up to 60 cm and a width of 50 mm. The machines are equipped with electronic length counters, devices for controlling web tension and other functions that allow you to perform all work quickly and accurately.
Need for cutting of rolled materials arises when the production of gauze, cotton wool and non-woven products requires a fabric of non-standard width in small volumes. In this case, standard rolls are cut on special machines equipped with special knives. Technological equipment allows you to maintain precise dimensions and ensure a perfectly even cut.
Technical characteristics of materials for rewinding and cutting
Our company guarantees
- prompt execution of orders, including large volumes;
- qualified advice on all issues related to slicing;
- exact adherence to specified dimensions;
- winding density control;
- prompt order fulfillment;
- favorable terms of cooperation.
Types of materials and prices for cutting and rewinding rolled materials
Rational use of rolled materials makes it possible to optimize material and financial costs for manufacturing products.