Verstat for rewinding rolled fabrics. Rewinding and cutting of rolled materials
Rewinding and cutting of paper sheets, spun, foil or non-woven materials is required for compact storage, ease of transportation, further processing and recycling of materials.
To wind vicor rolls, use rewinding-cutting machines to wind the canvas ball by ball onto the sleeve or directly onto the shaft. The drive of the workbench, when the web is wound, is tensioned and the tension creates a vice in the middle of the roll, straightening it radially to the center of the roll and proportional tension, expressed in units of force per width of the web, and proportionally back to the radius. This pressure is removed from the balls at once and rubbed between them. Rubbing between the balls will be proportionally flatter than the surface and rubbing ratio to the material. It itself transmits the wrapping moment from the shaft (sleeve) to the upper balls to the roll and creates tension in the web when wound. The grating protects the balls from being licked and thereby gives the roll its shape during transportation and preservation.
Web tension
The skin has unevenness in the transverse and horizontal directions, visually the fabric looks “baggy”. By adding tension to the canvas, it is tensioned and removed without unevenness and the canvas becomes more even. Then, under tension, the canvas becomes stiff and thus helps to remove the sagging, for example, between the shafts. Once established, the tension is created by rubbing between the balls after winding and helps to determine how many meters are wound in a given period of time (taking into account the fluidity, thickness and width of the material).
Figure 1. Basic parameters of late-day cutting workbenches
How do you determine the correct tension of the canvas? Based on practice, it is set to a maximum tension of 15-20% of the value, which indicates the tear strength of the material. For 90% of falls, the permissible tension at the boundaries is 50-550 N/m, and for 95% of falls at the boundaries: 20 to 2000 N/m. You can rely on these extensive estimates, or practice, to help you select a workbench drive.
How to get rid of slime?
Materials with a low friction coefficient will require more force to prevent licking. The balls and sleeves are drawn more around the area of the dot, the lower balls of the upper part of the roll. And narrow rolls have a smaller surface area between the balls, while smaller rolls have a greater tension.
What is the Buildup factor?
Buildup factor is the difference between the outer diameter of the core and the end diameter of the roll.
For fabrics with a high-grade consistency in the transverse direction and a high rubbing coefficient, you can easily achieve a wear value of close to 10. Tobto. on a 152mm sleeve you can wind a roll with a diameter of 1520mm easily and practically on any bench. And an axle for materials with a poor combination of low modulus in late straightness, high radial stiffness, low friction coefficient and poor flatness is difficult to begin with even after a wear value of 3-4. This is one of the objective problems of winding large-diameter rolls of 76.2 mm on sleeves. If you remember to wind the shafts with a large diameter, it will be easier to handle.
What is Poisson's ratio?
When we apply tension to the canvas in one direction, it changes its shape and becomes thinner in two other directions. Poisson's ratio is a parameter that characterizes the change.
The law is true that the majority of materials are in the 0.3% range. For example, PET fabric 1200 mm wide under tension stretches by 1% flex. Poisson hardens so that the canvas becomes 0.3% narrower in width, which is approximately 3.6mm. This is important because you need to cut the exact width.
Young's modulus
Young's modulus is the tangent of the slope of the curve under which the stress is applied.
Knowing the Young's modulus of wound materials is important if you work with different materials in a machine, choose a new machine, or want to solve the problem. Leather material has its own Young's modulus value, and this parameter indicates the behavior of the material on the machine for rewinding and cutting, as well as whether the machine is suitable for this material or not.
The range of changes in the value of Young's modulus in pre-modern literature is very large. If you work with polyester fabric at a reduction of 0.2%, then a change in the diameter of the shaft by 0.1% with a diameter of 76 mm does not have any impact on the process, unless with the same change in the diameter of the shaft you When processed with a sheet of aluminum foil at a stretch of 0.02%, then most you won't get a good result. When winding stitches on shafts or stagnant straightening rollers with soft surfaces, it is necessary to ensure the permissible level of change in the Young's modulus of the material. Apparently large changes in the diameter of the rollers can lead to licking of the fabric and little efficiency in straightening the folds.
Another butt from checking the shafts. For example, you have three sheets of PE, PET and aluminum foil with Young’s moduli of 100, 500 and 10000, but with the same tension of the sheet, give an increase of 1, 0.2 and 0.01%. If the margin in a vivirtsi is 0.1 mm on a shoulder of 1000 mm, that is 0.01%, then it is not possible for PE, because yield 1% + -0.005%, and from aluminum 0.01% + -0.005% will be noticeable and even more. Practice shows that the twist of shafts, suitable for most materials, except foil, becomes: 0.15-0.17 mm per meter.
How can I save the last of the canvas from the roll?
Consider the roll as a cylinder, which you see from the end. The entire area of the end is occupied by the wound material T. Therefore, according to the formula for the area of the stake, we get Pi (Pp2 -Pg2) T = Dovzhini. And by the way, since you know the wear and tear of the material, then the radius and diameter of which can be transferred. It is important to remember that after unwinding the canvas, you will release the tension and the canvas will become short. Here the Young’s module will come to the rescue to understand the lockout - with an increase of 100 m and a stretch of 1%, the lockout will be short of a whole meter.
How can you not show mercy to the vase roll?
Physicists calculate the value they call thickness or a unit of volume. You can forget that we have a sleeve, and it is empty and then the material is wound.
Give our roll a cylinder, fill it with water with a thickness of 1. Its volume, multiply by 1 and give maximum moisture to the roll for evaluation. Why the maximum? Because the PE thickness is close, but less than 1 (0.992-0.996) and in all other materials it is also less than one. Plus, when wound, the roll will always have wind balls, which will kill your lungs. Make sure to use as much money as possible, and it can be done quickly. For papers and cardboards, take a thickness of 0.72-0.76, for printed papers - 0.76-0.82.
The roll needs to be known to the operator in order to be spun with the loads from the drive. Otherwise, they may incorrectly assess the moment of inertia and problems may arise.
Workstations of the central rewinding type
Workstations of the central type of rewinding are the widest type of workbenches for rewinding. It is called because the turning moment is provided by the drive to the roll from the central shaft.
The layout of the central type is responsible for ensuring the winding or unwinding of the material according to the rules of the song or, as it seems, with the song’s profile to the moment of force. Rewinding follows the constant linear fluidity of the canvas, then. The formula looks like this: motor rotation in rpm xv = linear fluidity of the web in m m xv x transmission number \Pi, 2 and radius of the roll in m.
With a minimum radius, the fluidity of the wrap is maximum. As the radius or diameter of the roll increases, the wrapping fluidity must be changed in order to preserve the steel of the linear fluidity. If at this point the value of the interference has become, then the moment T = interference, multiplied by the radius. As the radius grows, the moment may grow. There is no need to maintain the steel linear fluidity of the canvas.
It is important to remember that the winding and unwinding proceed with straight lines behind the smooth shaft in the center of the roll. When the winding speed is wound, the speed changes with increasing radius, and when the winding speed is unwound, the wind speed increases with the changing radius.
Tension control
At the benches, tension control is organized behind additional contours of the gate linkage. We first need to determine how best to control the speed and the moment. Then select the circuit type: open or closed. Then choose the type of sensor to organize the gate connection in a closed circuit. For example, this could be a ballerina or a shaft with strain gauges.
An open circuit means that we practically do not have a turn-off connection, and we simply set a new boundary parameter. For example, on zusillya galma rozmotuvannya. Thus, the tension parameter in the open circuit does not change at all. This is a cheap method, and it will stagnate, since it is important for your process to control the speed of the liquidity, even as time goes by. modified scalar parameters.
In closed circuits the PID controller is called the same. PID controller (proportional-integral-differential controller) is a device in a circuit with a return link. It is used in automatic control systems to shape the signal of the carrier by removing the necessary accuracy and speed of the transition process. The PID controller generates a core signal, which is the sum of three additions, the first being proportional to the difference between the input signal and the turn signal (unusability signal), the other is the integral of the inconvenience signal, the third is the output signal at inconvenience. Alec for automatic operators. It is important for operators that the layout is reasonable and that the parameters are measured and set. Often problems occur due to malfunctions in PID regulators or their incorrect adjustment. If static control is at fault, then look for a problem in the integral part of the PID, and if the required value varies greatly around the set value, then in the differential part of the PID.
Vector and scalar drive
In both cases, we are talking about frequency conversion, although the terms “vector” and “scalar” are inaccurate in terms of their characteristics. It is unacceptable to adhere to the parameters of the alternating strum, since the use of the term “scalar” has disappeared.
From the course of elementary physics, it is clear that a scalar quantity is a quantity whose values (per vector) can be expressed by one (actual) number, after which the total value of the scalar can be displayed on a line of the scale (scale - names and stars). With scalar (frequency) control, harmonious flows of the motor phases are formed, which means that the control is consistent with the constant relationship between the maximum torque of the motor and the moment of support on the shaft. Then, when changing the frequency, the amplitude of the voltage changes in such a way that the ratio of the maximum torque of the motor to the moment of acceleration is no longer unchanged. An important advantage of the scalar method is the possibility of one-hour heating by a group of electric motors. The scalar method of heating allows for easy adjustment of the voltage while changing the factory settings.
Vector control is a method of controlling synchronous and asynchronous motors, not only by forming harmonic flows (voltage) of the phases, but by ensuring control of the magnetic flux of the rotor (torque on the motor shaft). Vector control stagnates at times when it is necessary to expand the range of frequency control, which allows the control range to be increased, the accuracy of control to be increased, and the fluidity of the electric drive to be increased. This method ensures constant control of the engine torque. Such control systems are more daily and expensive. The stench is characteristic of high-quality rewinding machines.
How do you control the fluidity of the canvas?
In most cases, the principle of vibrating the number of wraps of the shaft with zero slips and a long-lasting stake is used. Fluidity = 2 Pi RPM Radius. Your dovzhina simply appears as a multiplier of liquidity at this time. On expensive verstats, install drive shafts, tachometers or linear encoders to adjust the fluidity of the shafts, as well as magnetic, inductive and/or optical sensors on cheaper models. It is important for anyone to take care of the tension of the canvas and the tension of the shaft. Remember that the tension on the tensioned and unstretched canvas will give a difference in the proportional level of tension under tension.
What kind of cover is there in covering the shaft of the strain gauges?
Recommended by the plant growers, there will be more burial in the future, then. above 45 degrees. All right. The canvas under high tension and a light shaft can work with small angles of heat, which will be less than 45 degrees. However, when working with canvases at low tensions, the heat may be greatest. And turn it over again so that the vector is directly perpendicular to the force of gravity.
How is a ballerina correct?
In front of us, if we called ourselves a ballerina, we can dance easily, then. It’s practical to fly and care for nothing. It is possible to change the inertia of the shaft, it is possible to lose power, compensate for the inflow of gravity and pneumatics, improve horizontal systems, enhance the signal from the shaft, ensure that the blade is covered by 180 degrees and ensure that the shoulders are fully pressed lot before and after the shaft. Turn it over on your own desktop. The ballerina is sensitive to the folds of the fabric, it is important to adjust correctly to change the tension of the fabric, reacts poorly to changes in tension, and the tension is abnormal.
In the age of high technology, people are struggling to keep up with the times, with new types of products that are needed in various areas of activity. Our company has been an active participant in the market for the production of self-adhesive materials for a long time, and does not stand aside from the process of promoting innovation. Therefore, we are thoroughly innovating, organizing the release of new types of products, and introducing new types of services.
We're ready to hit services for rewinding materials and finished products from the output roll to rolls of smaller diameter. Vikonuemo rewinding paper, cardboard, flotsam, spun materials, non-woven materials, foil and other various rolled materials.
The glue application line is one of the most important units of equipment in our enterprise. The application of glue is the main significance of this type of application, but it is important to note that its technical characteristics allow it to be applied roll rewinding with maximum winding. The line is equipped with software controls, which makes it possible to control the strength of winding of rolled materials and the quality of the finished product.
Our capabilities for rewinding rolled materials
Principle robots for rewinding roll materials on the line of glue application it means that the output material is fixed on the unwinding shaft and, having passed through the roller system, is wound onto the winding shaft. Rewinding on this line allows you to work with materials that have the following characteristics:
The width of the fabric that can be unwound is up to 1500 mm.
The maximum diameter of the roll when wound is 1000 mm.
The main types of materials that can be rewound are: paper, cardboard, spun, spun and non-woven materials, foil, etc.
Technical characteristics of the types of products that are rewound on the line
1. Single-sided and double-sided polypropylene melt:
BORR, width – 1050 to 1250 mm, winding – up to 500 m
2. Polyester melts:
PET, width – 1050 to 1270 mm, winding – up to 300 m
3. Stitches based on aluminum foil:
MA, finished product width – 1050 mm, winding – up to 1500 m
LMA, finished product width – 1050 mm, winding – up to 500 m
MK, finished product width – 1060 mm, winding – up to 1000 m
MTL, width – 800 mm, winding – up to 1200 m
MKA, width – 1050 mm, winding – up to 900 m
4. The stitch is based on spun rubber.
Jumbo roll width – 1000 mm, winding – up to 180 m (depending on the quality of the material)
5. Stitch based on spun polyurethane (PPU), polypolyethylene (PPE):
PPU, width of jumbo roll - from 1000 to 1050 mm, winding - up to 120 m (depending on the type of material)
PPE, width of jumbo roll – 1000 to 1050 mm, winding – up to 450 m (depending on the type of material)
6. Double-sided stitching based on polypolyethylene (PPE).
Jumbo roll width – 500 to 1050 mm, winding – up to 450 m (depending on the thickness of the material)
Rewinding self-adhesive materials
By method rewinding of self-adhesive materials- unwinding of rolls that need to be rewinded. The principle of operation on a rewinding machine is that the output material is fixed on a shaft, which is unwound and, passing through additional shafts, is wound onto a cardboard spool. Verstat for rewinding rolled materials equipment with software that allows you to control the strength and thickness of the winding.
Technical characteristics of materials to be tested on the rewinding bench
The width of the fabric that can be unwound is up to 1400 mm.
Maximum material weight – up to 700 kg
The maximum diameter of the roll when unrolled is 1000 mm.
The maximum diameter of the roll when wound is 300 mm.
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FOR LEGAL OSIB:
- Unprepared layout for legal entities. Rahunki can be installed without maximum permissible limits. You can withdraw and pay the fee by entering the company details. You can fill in your details yourself when filling out an application on the website or by sending them to us. I'll mail it.
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1. Self-delivery from a warehouse near Moscow.
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Do you need prompt and clear information? rewinding of rolled materials, contact the GIFTEC company. We provide services for the processing of offset, office, kraft paper and polymer materials for printing. The current possession and rich evidence of the robots allows us to conclude the agreement at the minimum terms and with precise adjustments to the money order.
Most materials that are processed for the production of wood products are produced in rolls of great length and width. Therefore, the preparation of a large print run is due to the need to wind the required amount of material from a standard roll. In this case, the output roll is rewound into a number of rolls of smaller diameter and cut to the required format. Cutting and rewinding of rolled materials is finished on special benches, which allow you to unwind rolls with a maximum diameter of 1300 mm and a width of up to 1620 mm and to produce new ones with a diameter of up to 800 mm and a width of up to 5 0 mm. The workbenches are equipped with electronic dowels, devices for controlling the tension of the canvas and other functions that allow you to finish all the work smoothly and carefully.
Production of rolled materials at competitive prices and with precise parameters specified by the GIFTEC company. The evidence of immediate knowledge and high qualifications of fakivts allow us to conclude agreements promptly and clearly.
The need for cut roll materials It arises when the production of printing and other products of various types of paper or polymer melt requires a canvas of non-standard width. In this type, standard rolls are cut on special benches, equipped with blades or circular knives. Technological capabilities allow you to achieve precise dimensions and ensure a perfectly even cut.
Technical characteristics of materials for rewinding and cutting:
| Masa | 28-300 g/m2 |
|---|---|
| Tovshchina | 25-450 µm/m2 |
| Output roll width | 1620 mm |
| Roll output diameter | 1300 mm |
| Roll output sleeve diameter | 76, 152 mm |
| Vaga roll | 1200 kg |
| Width of finished roll | 20-1600 mm |
| Diameter of the finished roll | up to 800 mm |
| Core diameter of the finished roll | 76, 152 mm |
From our company you can obtain the service of cutting rolled materials:
- on benches with a knife, cerated by the operator;
- at logs on automated high-precision versats;
- jumbo cutting from distributing the output fabric into strips of a given width and their winding on a bobbin and other services for the preparation of materials for the production of other products.
Our company guarantees:
- I will provide professional assistance in any task with the opening of rolls and paper of various types;
- operatively vikonannya zamovlen, zokrema in great obsyagah;
- qualified consultation on all products related to sharp and rewinding of paper, polymer melts and other materials for printing;
- more precisely, adjusting the specified dimensions;
- control of thickness winding;
- promptly viconnary agreements;
- healthy mental health.
Types of materials and prices for cutting and rewinding of rolled materials*:
*Services from removal and rewinding are provided under IP without VAT
Rational selection of rolled materials allows you to optimize material and financial costs for the production of products.
