Stitching wrinkling problems and solutions
Stitch Wrinkle
Stitch wrinkling is produced in the stitching before or after the loss of the heart. There are also differences in feeding wrinkling, shifting wrinkling and relaxation wrinkling.
Feeding wrinkling
This is due to the different friction between the feeding and the material. As long as there is a feeding device on the sewing machine, the problem of feeding wrinkling will occur in the following situations:
● There is high friction between the lower fabric and the feeding tooth (R1)
● Low friction between lower fabric and upper fabric (R2)
● High friction between upper fabric and presser foot (R3)
R1 R2 R3 = Wrinkle
This wrinkling problem can be solved by individual methods: (I. e., use Teflon presser foot = R3 to reduce: use a sewing machine equipped with an upper and lower synchronous feeding system)
shift wrinkling
It was caused by the addition of sewing threads to the fabric. Because the sewing thread moves adjacent yarns around the needle hole, the result is an increase in the surface tension of the fabric causing wrinkling. The higher the fabric count and the thicker the sewing thread, the more likely it is to cause wrinkling problems.
Proposals to solve this problem are also controversial (using a knife needle). Perhaps the solution to this problem is to use an additional procedure (stitch position and warp yarn at 15 ℃ direction).
Relaxed Wrinkle
This problem generally arises when high elastic sewing threads are used and at high tension. The stitches are sewn under high tension and will wrinkle later. (This may take several hours before the problem occurs.) Changes in humidity and temperature are also some of the causes of wrinkling.
The following is a detailed description of the problem of slack wrinkling and a solution.
|
Question |
Recommendations |
|
Incorrect upper/lower line tension |
Readjust the upper/lower line tension |
|
The stitches are not shrink-free |
switch to better quality stitches |
|
Suture extension is too high |
Use lower extension sutures |
|
Inadequate suture handling |
Use properly treated sutures |
|
The needle number is too large |
Select the correct pin number |
|
The pinhole on the needle plate does not match the needle number. |
Use a pin plate with a smaller pinhole instead |
|
Pressor foot pressure too high |
Decrease presser foot pressure |
|
The machine does not use a mixed cloth feeding system. |
Use mechanical belt mixing cloth feeding system |
Needle fever
Needle fever is related to the following factors:
● Fabric (type of fiber, knitted or woven fabric, treatment, overlap thickness and composition of fabric material)
● Sewing machine (speed, stitch type)
● Sewing thread (type of fiber, treatment, construction method)
● Machine needle (needle number, surface, needle tip type, appearance)
● Environmental conditions (humidity)
In some cases, the maximum temperature that the needle can withstand can reach 450 ℃. Under the influence of this high temperature (reducing the hardness of the needle and making the needle lose its elasticity), the performance of the needle will be lost.
The highest temperature measurement position of the needle is usually at the eye of the needle (unless the shape of the needle is conical needle body and shoulder or when stitching multiple layers of thick materials). Here is a simulation of the heat distribution and penetration force of the needle. The part of the needle subjected to the highest penetration force is the part with the highest temperature.
More problems and solutions caused by needle fever are as follows:
|
Question |
Recommendations |
|
Damage to the suture |
Use a smaller needle size to reduce the needle temperature |
|
Residual dissolved matter on the needle surface |
Replacing the surface anti-clogging needle |
|
needle eye obstruction |
Use surface anti-clogging needle |
|
Poor quality of line handling |
switch to high quality wire with proper handling |
|
Poor handling of fabric |
Contact with suppliers for better fabrics |
|
Broken wire |
Reduce machine speed, use line oil or needle coolant |
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