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kuper FW1150 stitching veneer trouble

8/16/14       
Stephane Member

We bought a recond ZIG ZAG stitching splicing veneer kuper FW1150.
It works well except for 1 point :
each time the veneer already stitched is ejected when passing through the automatic rubber wheel at the back of the table, the glue thread (kuper 1220) does not break and the stitches of the finished spliced veneer come off on the last 15 cm.
We tried to modify the pressure on the veneer by the wheel it does not help.
Does anyone as experienced the same problem ?
Thank you for your help

Stephane A.

8/18/14       #2: kuper FW1150 stitching veneer troub ...
John S.

When was the last time you cleaned the heater tube? If not cleaned regularly, you will get some adhesive build-up inside the tube, which will interfere with heat transfer to the string. The start of the splice is just fine, because the string is idle in the heater tube and has plenty of time to react to the heat, but by the end of the splice, the string was newly pulled into the heater tube and if not clean, may not get enough heat to melt completely.

8/18/14       #3: kuper FW1150 stitching veneer troub ...
stephane Member

Hi John,

Thank you for your answer.
The heater tube is clean. I do not think the problem is coming from the heat but more from the string. A technician told me that Kuper string is made from fiber glass with glue on it. I tried to cut it with manually, it s really difficult.
If the strings are always made of fiber glass and always so strong?
If I increase the heat, the glue dried too slowly and the veneer is not joint because no bond so i believe the heat is correctly set.
We tried also to use string 1110 from Kuper but we do not succeed to find the good setting. amount of glue is too little to have a strong bond.

any other advice?

Stephane

8/19/14       #4: kuper FW1150 stitching veneer troub ...
John S.

The Kuper string should break fairly easily, especially when heated to operating temperature. I have had "tough" string occasionally in the past, but not to the point I had a hard time breaking it, even before heating. So it could be the string itself. The only other thing I can think of is to slow down the feed speed, but that's really more related to temperature again.

8/26/14       #5: kuper FW1150 stitching veneer troub ...
Rich

Is it hot air heated or direct heated tube ?
May not have the right thread

6/17/15       #6: kuper FW1150 stitching veneer troub ...
stephane Member

our machine is a direct heated tube. the machine seller advised us to use the kupper thread 1220.
We try to increase the temperature but without success. Presently and unfortunately we still have to cut the thread with cutter before to joint new veneer.
Is the hot air heated tube better ?


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