Sewing thin acrylic canvas

[Edsbear]

Bit of a problem if anyone can help please.

I am sewing acrylic canvas and occasionally get a loop on top and getting a bit of pucker too, please see picture. I have adjusted tension, checked hook timing, stitch length etc I am now 

wondering if there may be a mechanical problem with the machine or is there something I'm missing. The machine is a Brother LS2 B837. Needle is a 19/120. Thread is Coats Tkt 036

Many thanks

Edited Monday at 01:30 PM by Edsbear

[kgg]

2 hours ago, Edsbear said:

Thread is Coats Tkt 036

I think the problem is related to the thread and needle configuration you have selected. A good reference chart for needle to thread size is located here ( https://www.tolindsewmach.com/thread-chart.html )

The #19/120 is too large for thin acrylic, causing inconsistent penetration and hook timing issues

Inconsistent top stitches like loose loops every few stitches on thin acrylic canvas probably the result of an oversized needle creating slack in the coated acrylic canvas holes, mismatched tensions, or threading issues in this industrial walking foot machine.

My understanding is the Coats Tkt 036 thread is a all purpose core-spun polyester probably Coats Epic and more linty / woolly then the bonded polyester like Coats Dabond. If the item is being sewn for an outdoor item or upholstery maybe change to Coats Dabond. 

I would suggest:

i) Change needle first: Drop to #14/90 or #16/100 sharp/microtex (not leather point). The #19/120 is made for V92 and properly leaving a small gap where top thread doesn't catch consistently on the thin acrylic canvas.

ii) Top thread tension. If the the top and bobbin tension isn't balanced properly where the top thread tension is to great it will cause top-side loops.

iii) Stitch length properly should be about 4mm and sewn slowly so to help reduce hook timing issues. 

kgg

 

[Edsbear]

Thanks for the advice, I will be giving what you suggested a go.

The coats thread is Terko Satin is a cotton wrapped polyester core spun thread with a satin finish

[Edsbear]

Also thank you for the needle/thread link