Xiamen Unitex Trade Co., Ltd. is a professional underwear sourcing & supply-chain management company based in Xiamen, Fujian Province, in the Xiamen–Quanzhou–Jinjiang knitwear cluster of south-east China. Founded by Will Lin, who has worked in the apparel trade since 2004, the company has been exporting since 2009 and was incorporated in Xiamen in 2013. It runs its own liaison office in Jinjiang and works with a network of BSCI & OEKO-TEX Standard 100 certified partner factories to serve retailers and brands across Europe, the US and Australia.
With the improvement of living standards, people’s pursuit of clothing quality has also improved. Whether it is underwear, clothes, shoes, leather bags, quilts, etc., the quality can be seen from the stitches, so some merchants will describe the details of underwear stitches to highlight the quality of underwear. Do you know what sewing machine these smooth and clean stitches are sewn by? Let’s take a look at the high-quality sewing machine in the underwear manufacturing industry – four needles six lines.
What is fourneedle sixlines?
Four needle six lines originated from a curved back patch sewing machine introduced and developed by Japan’s Oling Company, which is mainly used for splicing and splicing of sewing pieces. This machine sews the internationally recognized ISO607 stitches, which are highly dynamic and consist of four upper threads, one bottom thread and one Hash thread. It has a unique sewing effect of high elasticity, flatness and high strength.
What are the advantages of four needle six lines?
Four needle six lines are widely used in the underwear industry. The barrel-type machine base and the walking presser foot make it easier to stitch high-elasticity fabrics (such as nylon fabric underwear) and linden over seam. According to the different fabrics and uses, there are various specifications of presser foot needle position parts corresponding to single-cut double-cut, and equipped with a small servo computer motor that is integrated into one, the pursuit of high sewing quality and single operability New cutting-edge model. The key point is that the equipment saves the links such as flat seam and overlock seam in practical application, and has a leap in efficiency and quality compared with ordinary sewing machines. And the quality and appearance of processing are incomparable with ordinary sewing machines, which has written a new chapter for the innovation of the knitted underwear industry and increased more labor.
The four needle six lines consists of four upper threads, one lower thread and one stretcher thread. Compared with the three needle five lines stitch, the four needle six lines has the advantages of being beautiful, straight and similar to seamless, and is often used in the production of underwear and sportswear. This is a high-level craft. A four needle six lines sewing machine costs tens of thousands of RMB. The seams are firm, the trimming is neat and not hemmed, the stitches are beautiful and dynamic, and it can be perfectly sewn in multiple processes at one time. It is widely used in high-end sports, clothing, yoga clothing, underwear. Four needle six lines are also dedicated to the unique high elasticity, flat and high strength seam effect.
Three-needle five-thread versus four-needle six-thread: where the extra needle goes
1. Three needle five lines (shrimp whisker thread/flat lock stitch): flat lock stitch, generally used for seams, generally has three layers of fabric, which is thicker than the four needle six lines one.
Mainly used for men’s breathable boxer briefs, the main function is to sew again with three needle five lines at the suture of two fabrics, or the suture of two pieces of fabric.
Functions: 1. Reinforcement; 2. Flatten the corrugation of two pieces of fabrics; 3. Decorative function (commonly known as hemp silk thread).
The location that needs to be stitched: the bottom of the underwear, the front of the underwear, etc. where there are seams.
2. Four needle six lines: thinner and stronger than the traditional three needle five lines. And the processing fee is relatively high. Generally, small factories can’t do it. In contrast, the traditional three needle five lines suture is thicker.
Four needle six lines process: ISO607 stitch, with high-strength, flat and high-strength seam effect.
The four needle six lines consists of four upper threads, one lower thread and one stretcher thread. Compared with the three needle five lines stitch, the four needle six lines has the advantages of being beautiful, straight, and the seam of the seam is not so thick, which is similar to seamless. Commonly used in the production of underwear and sportswear (such as shorts sports bra set), with high elasticity, flat and high-strength patchwork effect, there are generally two layers, one layer less than three needle five lines.
As shown in the left picture below: the inside of the four needle six lines is smooth and flat, and the wireless head does not come off the thread.
As shown in the right picture below: the suture with three needle five lines will be thicker.
Unitex Underwear – 4 Needle 6 Lines most comfortable mens underwear for a high quality of life in plain comfort.
What to specify, and how to tell a real 607 from a mock
Six lines turn the stitch from a description into a specification, and the same six make it checkable on the floor.
- Name the class. ISO 4915 607 — four needles, six threads, cover stitch. “Flatlock” alone does not specify which of the three classes was bought.
- State the density. 12–16 SPI, with the chosen value given per seam rather than once for the garment.
- State the needle span. 5.5–5.6 mm class, set by the machine needle positions measured across the seam.
- State the acceptance. Seam strength to ISO 13935-2, acceptance at AQL 2.5 to ISO 2859-1, and no pinholes at 150% extension.
- Check it inverted. Four parallel needle rows on one face and one continuous ladder on the other. Three rows means a 605 was run.
- Know the mock. A mock flatlock is a three-thread overlock at near-zero needle tension — a lattice on one face, a single loose row on the other, no top cover thread. It photographs well and fails all of the above.
The same stitch appears in the products of SAXX, DAVID ARCHY and ExOfficio — DAVID ARCHY names the four-needle six-thread construction directly in its product copy. The names are cited as a market reference; they are not customers of Unitex.
For the full product specification — three fabric families, size grading S–XXXXL and the 3,000-piece basis — see four-needle six-thread boxer briefs. For the inspection protocol, see flatlock seam inspection. For the choice between sewing and bonding, see sewing versus bonding.
· Xiamen Unitex Trade Co., Ltd. — OEM & ODM underwear sourcing partner