web guide replacement kits

[Music] So the final question here is that you have a web guide and we talked about all these different things. What is the accuracy or how accurately can you guide a web? It actually depends. Like I mentioned, there are lots of different parameters that are going to affect the accuracy of the web guide.

If we are just dealing with a steady state error, we can expect plus or minus 0.25 mm. If you have a good machine in a perfect material, this is what you can expect. Higher accuracies are possible. Like in printed electronics, you can get much higher accuracy.

But if we're dealing with steady state errors, you have a good edge and all those kind of things, this is possible. But the problem is that most web guides are going to come into transient errors. These are either disturbances or material properties that are going to affect the disturbance in the web guide. Now, if you're trying to correct a transient error, it really depends upon what is the magnitude of the error, what is the frequency of the error and so on.

And another important thing that we need to consider is that these transient errors can actually propagate downstream of the sensor and these are called what are called as wave generation. Even though you correct it at the sensor, you don't really know the angle at which the web is approaching and that can cause weaves downstream. You won't have good guiding performance if you have wrinkles. I mean, if the web is wrinkling, that is going to cause the edge to move back and forth.

There's no way you can have good guiding performance with that. Or edge curl, flutter, or sometimes plane change can also have that effect. If you have large magnitude error and your stroke of the actuator is limited or the correction that the webgate can provide is limited then you can expect good grading performance whenever the actuator tops out on either side of its stroke. If you use a lower bandwidth actuator and you have a higher frequency error, you can expect good guiding performances and sensor.

If you don't have a good sensor or if it has gain changes then you can expect a good guiding performance and then improper installation can actually amplify the error. So that's another thing that we can expect. Anyway, so just to summarize the factors affecting we talked about a machine related, process related, material related and the web guide related which is like the stroke deadband actuator backlash correction stroke limit and things like that. So in terms of design requirements uh a good knowledge of the the the conditions like web speed location thickness stiffness environment tension side correction all of these are important for us to have a welldesigned web guide.

If you have a good understanding of all of these, we will do well. [Music]

[Music] So in terms of actuators, there are lots of terminology that is involved. Some of them are thrust or power, how fast the accelerator is, what is the correction speed, what is the acceleration, stroke length, mounting, what type of coupling we have and things like that. Actuators are pretty standard right now. It's not as important as installation of a web guide or the sensor, but it is an important part of a web guiding system.

The older actuators were either pneumatic or hydraulic. You had an hydraulic pump pumping a double acting cylinder and moving the web guide structure. These were more common in the 50s and up to about maybe '90s before the electronic electromechanical actuators started coming into the market. You could have pneumatic actuators or hydraulic actuators.

The hydraulic actuators have the advantage that it can provide high thrust and can shift large loads quickly. Even now in metals industry, hydraulic actuators are pretty common. You can see them. But the problems are that it's a problem with maintenance.

You need to balance the valves and stuff like that. Change the filters. They could cause leak and this could contaminate your product. And then the precision and accuracy that you can get with an electronic actuator or electric actuator is not something that you can expect in an hydraulic actuator.

So most web guides nowadays are going to use actuators like what these actuators usually have a motor that drives a belt pulley system. There's usually a lead screw, a ball screw or a roller screw that converts the rotary motion into linear motion at the end of the actuator. Some common terminologies that you would see with actuators are maximum current, voltage, power. Whenever we have something with a lead screw or a pitch, that's a common term.

What is the lead of the actuator? Pitch of the actuator. Gearing ratio. Backlash is another thing that you would commonly see with electric actuators, especially with low-end lead screw actuators.

Resolution. What is the smallest movement an actuator can produce? Back drive is a common terminology especially if you're installing a web guide that has to work against gravity. And then types of actuators you have inline and reverse parallel.

Some actuators have limit switches or end stops. And then type of motor used in the actuator. You would commonly see servo stepper brushed or brushless DC motor. So actuators are providing the driving force to the guide structure so that it can position the web.

In terms of thrust, the thrust is the amount of force exerted by the actuator to move the guide structure. And this thrust really depends upon as we saw before mass of the structure that we are trying to move, what is the friction there, how fast you want to move and sometimes gravity as well if you're acting against gravity. In terms of sizing actuators, these are some of the things you need to know to size an actuator properly. a web blind speed mainly because if you have a slow moving web the maximum disturbance frequency you can get depends upon the speed of transport of the web.

If you're moving at 100 ft per minute you might not need a high dynamic response while if you're moving at high speed you might need a much higher dynamic response. The dynamic response is related to the acceleration. Acceleration is related to the thrust. So that's why line speed becomes important.

Guide structure weight and roll weight. If you're trying to move a big mass, we need to know that what type of bearing you're using. So that what is the breakaway force that we need to overcome based on the coefficient of friction of the bearing and then what kind of disturbances we are trying to correct for. There is a correlation between the amount of disturbance that can propagate through a roll-to-roll machine that really depends upon the speed of the web.

The faster you go, higher frequency disturbances can go through. So the web acts as like a low pass filter and then the acceleration and then if you have to look at any gravitational effects. These are some of the key factors that are involved in properly sizing an actuator. But like I said, actuators are pretty straightforward nowadays.

Just need to have some basic questions answered and then we'll be good to go. [Music]

hi this is petrol in law school with roll-to-roll technologies most people think of us as a narrow web company but we actually go into the white web applications - and to show you that we want to present to you our wide range of actuators available for both narrow web applications and white web applications in this front row I have for our narrow web applications these are the actuators that we use in our smaller web guys they go up to about for up to 22 inches in width and so they can handle web's up to 20 inches in this case this a small actuator is what we use it can handle up to 50 pounds of thrust so 450 pound tension applications and it's what we use in our low profile web guides then we have our our larger actuators which we use for applications such as our compact web guide and these can also go up to 50 up to about 150 pounds of tension and then we have the double stack actuator which we use in bigger applications and these can go up to 200 pounds force so they're all available for you for narrow web applications also we have an application for our retrofit kits in this case I have one of our featured actuators which you can see it also has mounted the several Center on it now this is a very robust application it can be provided with you with eyebolt terminals on either side or we can easily with clevis doing so if you have a web guide in your in your plant that requires you know the mechanical parts are all good the controls are update outdated you can actually we can provide you with an actuator and our controls and sensors to it so this is more or less the setup that we will probably we can mount it either through the eye bolts we can mount it through clevis or we can mount it directly on a any fitting that you might have on your machine these are very easy to install and they come already with the several Center mounted on them so it's all up to the particular application that you have in a problem that you want to solve another area that we want to talk to you about is on our terminal web guides like I mentioned before people think of us as a narrow web company but we're not we actually cater up to also the the wide web applications and also we cater to the terminal guy diplucate so in this case we have featured some of our what we call the actuators for terminal guides for online xandrie once we have multiple ways of installing these on your machines depending on your needs we can do either clevis mountings or we can install it directly on the base of the actuator now we can provide you one that would work that would move a 1500 pound load a 5,000 pound load or up to 15,000 pound load so it's a very hefty product as you can see it's a very heavy and we use it to like I mentioned before to move unwinds and rewind so I have it hooked up to our one of our control units with one of our infrared sensors and just to show you how easy it is it can work pretty well with our with our controls right here right and if I put it on automatic as I use my hand as a material you see how it just and we can adjust the speed of this application depending on your needs so we hope this has been of information of use to you and like I mentioned before if you need any help with retrofitting an old web guide you can contact us more information you can go to our website ww2 and thank you for a time you

hi in rolls-royce technologies we keep making advancements with our products and I want to talk to you a little bit about the our retrofit kits for web guiding systems now our retrofit kits are available for most applications that are out in the market the advantage is you just replace controller the actuator and the sensors on your web guiding system and just keep the mechanical components mechanical components can last a very long time and they're easy to maintain but the this part is what's really the the the nitty gritty of a web guiding system and what we want to allow you to do is to have the most advanced technology in your existing web guiding system so for a typical what typical retrofit kit would be composed of a a control unit with a screen a motor driver an actuator and a sensors in this case what I have and what I'm showing you here is something that we have actually modified to our old systems they make them a lot better according to what our customers have been requesting from us for example in our in our motor driver now it's a quick disconnect so as you can see we can just plug and unplug a cable here and allows you to also have the same thing on our actuator now this allows the customer to select the size or the length of the cable that they need and it's on off-the-shelf cable so you don't really have to buy from us you can go directly to the cable suppliers additionally we have also come up in our sensor mountings we have come up with brackets that slide are easy to lock on to position very sturdy so therefore you just mount a aluminum extrusion or one inch aluminum extrusion and it's very simple to use you just turned the the locking mechanism and you can slide it into position water ever you want and once you have it in position you can lock it back up and it's firmly in place now these aluminum extrusions you can buy them off the shelf and you can buy them for any length that you want so these are very very handy to have now they are also available for our other sensor sizes for the 221 millimeter sensor to now the advantage of the 221 millimeter sensor is that with the flow these forty eight millimeter sensors you would have to move them if your web with changes quite a bit but with a 221 if the web width is within the sensing window of the 221 you can just use our application where you can adjust the the guide point either automatically or by just with your finger or by setting it by moving it in increments of a certain length so that's those are some of the features so with our actuator we can provide you with options as to how to connect the actuator to your machine now we can provide you with either clevis amounts on e on either side or we can provide you with a feral rods it all depends on what you have in currently installed in the machine we're trying to get as close as possible to doing this that's a drop in there might be some slight modifications but if we can you make it as a drop in it will be a lot better for you now another thing that we have available for you a controller that has the operator interface and a screen touch screen where the operator can actually do all the controls of jogging left/right or several Center put the machine in operation determine whether what the sensors are the controller also has up to two sensors that it can work with for the guiding process another thing that we have available for you now we have a team of sales reps all over the United States so they can help you start the process of determining what do you need for your system in order to do the retrofit retrofit kit for your current web guiding system in order to do that all you have to do is just go visit us at our website at www.ge.com tacked us there we have a whole listing of all our are all sales reps all over the US in Mexico and in Europe we hope that this can be of service to you and we believe that this application of retrofit kits will be of great value for your operation you