Piping/Welting around corners

[Edsbear]

I am having a problem when attaching piping when it turns corners, its basically leaving a crease on the piping on the inside of a 90 deg corner. I wondered if anyone else had this problem and have any tips to stop this happening please

Edited February 16 by Edsbear
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[DieselTech]

Cut little V-notches on the back side of the piping at the corner radius.

[Edsbear]

I tried the corner notches but didnt make much difference

[Wizcrafts]

2 hours ago, Edsbear said:

I tried the corner notches but didn't make much difference

What material, thickness and diameter is the piping? Are you using a properly matched piping foot set? If it's thin leather, try rubbing Carnauba Creme on the area that's going to make the sharp turn before it gets to the feet. Or, apply it to the entire length in advance. Carnauba Creme softens and preserves leather and can be polished with a piece of wool fur. The added flexibility may help get rid of the corner wrinkles. If the wrinkles persist, try skiving it down a little thinner. If it's cloth or vinyl, check on upholstery forums, like https://www.theupholsteryforum.com/.

[Edsbear]

The material is canvas with vinyl piping. Piping is 3mm plus the thickness of the fabric. I use a 5 1/16" piping foot to start and finish with 1/4" (I had the same problem with leather but never used the Carnauba for that job)