Factory facilities before decades were completely different from now.
The biggest difference is that the sewing machine is a footstep and the sewing thread is a cotton.
Now the sewing machine becomes a motor, the yarn is mainly made of polyester.
Because the old sewing machine sends the fabric with only the feed on the bottom side, the stitch will clog when getting thicker steps and the stitch will expand when going down, so the stitches are not constant.
In modern industrial sewing machines, a "needle feeding mechanism" that send the fabric by moving the needle back and forth along with the feed is standardized, so beautiful regular stitches not affected by steps are formed.
~ Sewing thread ~
When the sewing machine was turned into a motor, the cotton yarn broke immediately without following the speed, so it was transformed into a heat-resistant and high-strength polyester yarn developed in the 1950s.
Please see the picture on the left、
Left = polyester thread
Centre = one-wash of cotton thread
Right = Used processing of the same cotton thread as the centre
The three are originally the same orange.
The polyester yarn keeps the original orange color, but the cotton yarn fades white by the used processing, and the color changes even in one stitching.
If you use cotton yarn with old sewing machine, you will feel a vintage-like old taste and uneven handmade warmth.
Most of caqu's denim products are made with this.
Older sewing machines are hard to maintain, and sewing and washing are very time-consuming when using cotton threads, but we are passionate about "making really good jeans".
The thread sample book that we use everyday.
100% of cotton is only a little bit of the bright part in the lower right, all the rest is synthetic thread.
You see there are few manufacturers that can master the cotton thread.