Barry : Welcome to the HellermannTyton ACADEMY, the workshop for the professionals.
I am Barry, this is Mark.
Mark : Hi.
Barry : Today´s question we have been posed is, ...
... how do you create an environmental seal ...
... using heat shrink shapes on a cable jacket?
Our session today is a practical demonstration, ...
... so we don´t just talk, we do the actual demonstration for you.
We’ll talk you through the process and by the end of it …
... we are sure, you will be confident, to be able to carry out the process yourself.
We need to abrade the cable Mark.
Mark : So, why are we abrading the cable Barry?
Barry : To give it a key, in preparation for the installation of the boot and adhesive.
So can I have some abrasive paper please ?
Mark : Certainly. Can you explain what you mean by a key?
Barry : Yep, the key is to rough the surface up.
Mark : Right OK, I see.
Barry : Yep, so if you have two slippery surfaces when you try to bond them, …
... they will slide, if you have two rough surfaces they will grip.
Mark : OK, is there a reason why you are actually, ...
... abrading it, or roughing it, going up and down, and not around the cable?
Barry : Yes there is a reason for that, and I will explain it, ...
... as soon as I´ve finished this ...
... and we’ve abraded the shape as well, OK.
Mark : OK.
Barry : So, we also abrade the shape because that´s part of the bond process.
Mark : Right OK.
Barry : Now these ones we do circular.
Mark : So why is that then Barry?
Barry : One reason is, it is very difficult to shuffle, ... Mark : Yes.
Barry : … inside, and you can also roll the abrasive paper up ...
… and it fits nicely in the legs.
Barry : Like so.
Mark : OK, yeah.
Barry : But the key, the key, ..
Mark : The key.
Barry : … the key to the keying, he he, is this:
This has been abraded this way, ... Mark : Yes.
Barry : … and this has been abraded that way, so when the two come together they create a cross, ...
Mark : Oh I see.
Barry : … so you get an even stronger bond.
Mark : Right I, understand that.
Barry : Yes good. So now we need to dry wipe them with some paper.
Mark : And I assume we dry wipe it to get rid of all the dust, ...
Barry : Correct.
Mark : … that´s created.
Barry : Yep.
So we need some adhesive tape.
Mark : Yes I’ve got some here, …
Barry : That´s great, thank you.
Mark : … that´s already prepared.
Barry : We´ll switch on the heat gun to warm it up in advance.
So we have our mark.
Mark : Yes, when you wrap this around Barry, ... Barry : Yes.
Mark : … is it just going to unwrap?
Barry :- No, because we have a clever little top tip.
Screwdriver please.
Mark : Certainly.
Barry : This is a hotmelt tape.
Mark : Yes
Barry : So when you heat the screwdriver …
Mark : Yes.
Barry : … we can tack onto the tape.
Mark : I see. So you tack the tape together … Barry : Correct.
Mark : … so it doesn´t come unwrapped.
Barry : So I recommend anybody who installs this sort of product does that for ease of installation.
Mark : Right, I see yes.
Yes because you wouldn’t want it coming unwrapped would you...
Barry : No.
Mark : ... when you are trying to, put the heat shrink shape on.
Barry : Like so.
Mark : So that is all nicely tacked on now, so it won´t come unwwrapped. Barry : Yes.
Barry : OK, now we need our protective wear.
Mark : I assume we need our protective wear because it gets hot?
Barry : Yes, and you are dealing with a hot heat gun so, …
Mark : OK.
Barry : … so we slide the shape on over the legs, like so, ...
... over the body and there we have the tape.
Mark : Does it matter if the tape is showing?
Barry : No that´s perfect because now you know you have... the tape is 25 mm wide, …
Mark : Right.
Barry : … so you know you have just as much inside, as you have outside ...
... so you’ll get a very good bond.
Mark : OK.
Barry : So the heat gun is already pre-warmed ...
... from our tacking process.
So we start in the centre of the shape.
Mark : OK do you need to pre-warm the heat gun?
Barry : It´s a good thing to do, because if you start using a heat gun when it´s not up to temperature, …
... you are wasting time and you are not providing the correct heat source to allow it to shrink, ...
... because these shapes need around about 225°C to 250°C to get them to shrink, ...
… at around about an inch.
Mark : So is that what the heat gun is actually set at?
Barry : Yes the gun is set on setting 7 …
… which is, on this particular gun, is what we require.
Mark : So it´s really important that it is a good quality heat gun?
Barry : Yes
Mark : And it´s well calibrated?
Barry : Yes.
Yep you should calibrate your heat gun at least once a year minimum.
So it´s starting to recover now.
Mark : So I can see, it´s changing shape.
What do you mean by recovery? Is that changing shape?
Barry : Yes. So when we manufacture the product, it´s in a certain form ...
... then within the factory, we then re-heat them and strech them or expand them, ...
Mark : Right.
Barry : … into the supplied form, and I´ll explain to you once we´ve finished this process.
So once that becomes fluid, it will run seal up the end of the cable, ...
Mark : Right.
Barry : ... and create the environmental seal that we are looking for, for our customers.
Mark : Can you explain the environmental seal again?
Barry : So an environmental seal can be anything up to IP69, …
Mark : Right.
Barry : In this particular case its around about an IP65, IP66 …
… because it´s not completely impervious to chemicals, …
... it´s purely aimed at a water and environmental, so dust, dirt that sort of thing.
Mark : So dust and moisture.
Barry : Correct.
Mark : Yes.
Barry : So this is perfect for being used on low voltage up to a 1000 kV …
… and being buried in the ground.
Mark : So will it be ready to use as soon as you´ve finished?
Barry : Yes, pretty much, once it cools down to room temperature ...
… we will be, it will be, ready to install.
So you can see that´s has recovered nicely now!
Mark : Yes, it´s changed shape totally from what you put on there.
Barry : Yes so let me explain the memory and the recovery.
So this is our finished part, ... Mark : Yes
Barry : … so we’ve got a recovered shape, adhesive either end, sealed well, ...
... so no moisture or dirt can get in.
Mark : So that adhesive at the end doesn’t matter ?
Barry : No, that’s perfect, because it adds a layer of protection, ...
Mark : Ah I see Barry : ... so this is how we supply them at the factory,…
Mark : Yes. Barry : and this is, so this would be the supplied profile ...
… and this is the recovered profile. So you can see the difference in the memory process.
Mark : So the memory, means it’s been moulded, then expanded!
Barry : Correct, yes.
So it provides a perfect seal to the cable once it´s installed.
So it allows you to install the boot, ... Mark : Yes.
Barry : ... over a smaller cable size, and, then when you recover it, it shrinks to your required cable diameter.
Mark : Oh I see excellent.
Barry : So you then have a perfect seal.
Mark : Very good yes.
Barry : Ok? So if you enjoyed this demonstration ...
... please like us and subscribe to our page ...
... and we’ll, myself and Mark , we’ll see you again soon. Bye.
Mark : Bye.