Name of the knife that cuts the back of vinyl?

[David Gwyndaf Povah]

hello the thing your after is called a bodyguard knife , yello tools do them they will be on signgeer

[Graham Scanlan]

Hi the most popular used is a Snitty Knife

https://www.amazon.co.uk

[RobertLambie]

There are a few names for the knives, another is a backslitter knife.
These originally came about for wallpapering and it was paper companies like Muraspec that first introduced them.

Since then, vinyl manufacturers and associated companies have adapted and improved them to work with vinyl. the main one being the addition of a Teflon coating on the foot of the blade holder. which is the part that would normally run against the wall, but now has to slide between the adhesive of the vinyl and the backing paper.
having the Teflon coating allows it to glide between the two layers without sticking to the vinyl and snagging.

There is also double-blade back slitters. again, to aid in the use of large format prints, wrappings etc.

https://www.youtube.com/watch?v=xiYAxivg-hc

[Simon Worrall]

Guys I don’t think she means the snitty type of knives, she means the knife with an adjustable blade that can cut to a precise depth and no further.

I have one in the shop, I will take a look on Monday and let you know what it’s called.

Update…

found it online.
It’s an Olfa Top Sheet cutter
Here’s a link to the NZ supplier.
Must be someone in the UK selling these.

[Leslie Anderson]

Thank you very much david, graham, robert and simon. ❤
it was the backslitter one i was meaning. thanks guys!👍

i do have the snitty one Graham, which i use with my “pride and joy” hp printer! 😀

i have never seen that knife, simon. but thank you.

[Martyn]

whilst on the subject, the bodyguard style knife, i seem to end up with a sliver of backing paper (blade thickness) that ends up stuck to the vinyl which is a pain to remove and obviously leaves a line under the vinyl. Has anybody come across this problem?