There are many processes in the process of making a sports bag. A professional mountaineering bag can be divided into hundreds of processes, which is very complicated. But the main work is not much. The following introduces some main workmanship terms, so that you can say a few professional terms when buying bags. I think the bag sellers don’t dare to fool us easily.
1. Seam
Seam is to join two pieces of material together, which is the main process of wrapping. Generally speaking, the seam does not include the zipper and the trademark material to the fabric, but generally refers to the seam between the fabric and the fabric. Especially the front piece and the back piece of the bag are combined together. The general casual overlock seam is only one time, that is, one thread. Some customers of mountaineering bags require the seam to be two times to increase the firmness.
2. Broken thread
There will inevitably be a broken thread where there is a seam. Generally, the customer’s requirement is that if there is a broken thread, drop 1 inch before continuing to sew, such as Jansport , Kelty, Lowe Alpine, K2 and other customers all require this, so if there is a broken line, there will be two more trips. Generally speaking, the invisible place, that is, the seam inside the bag, is allowed to be broken, but the open line on the outside of the bag is not allowed to be broken.
3. Upper and lower thread
The backpack is sewn with a sewing machine. This sewing machine has the same principle as that used at home, with one upper thread and one lower thread. The upper and lower lines require the tightness to be adapted, not one loose and one tight. If the tightness is not the same, there will be a phenomenon of pulling the nose, that is, the suture has a small buckle one by one. This is unacceptable bad.
4. Needle code
The needle code is the density of the stitching needle code. Usually expressed in 1 inch needles. The needle size of the general backpack is 1 inch and 8 needles, which is stipulated in many leisure bags of customers, such as Jansport, Eastpak, Trans, REI, etc. But there are also requirements for smaller needle sizes. Dana’s bag under K2 requires 1 inch and 9 needles. Generally speaking, 1 inch 8-9 stitches are more suitable. If it is less than 8 needles, it is not very good for mountaineering bags. As a reminder, 1 inch = 2.54 cm.
5. Thread end
The thread end is the thread left after sewing. Basically, all customers require that the thread ends be cleaned, that is, use scissors to cut off the excess thread and bake it with fire. Some customers are very strict with thread stubs, such as Lowe Alpine and Dana Design, who hate thread stubs. They stipulate that if the thread is longer than 3MM, it is bad! Therefore, when you buy a bag, you can also see whether the workmanship of the bag is fine by looking at the thread.
6.Painting powder
Painting powder is what is used to mark the fabric in the process of making bags. Customers all require that all the painting powder on the bag be wiped clean after the bag is finished. Some clients are particularly sensitive to painting powder. Therefore, you can also see whether the workmanship is fine by looking at whether the paint powder remains on the bag. Especially the painting powder on the edge of the webbing, the painting powder here is not easy to wipe, and there may be residues.
7. Backstitching
Backstitching is to increase the firmness. In the process of sewing, the sewing thread goes back once and then goes back and goes again. The thread cannot be used in this process. shear. Therefore, one reverse stitch is 3 stitches, and two reverse stitches are 5 stitches. Generally, the places where the weight is more heavy need to be reversed. For example, the zipper head, basically all customers require a back stitch when the two ends of the zipper are in the seam. This is very important, because a reverse stitch will likely have problems with both ends in a short time. Pay special attention to this part when buying a bag. There are not many parts for two back stitches, and some customers do not require two back stitches, because twice back stitches are likely to break the material, especially for thin materials or nets. Some mountaineering bag companies prefer to tie back stitches twice in the weight bearing area instead of knotting.
8. Knotting
Knotting is a way of knotting with a special machine. First go straight three knots and then zigzag back and forth. General customers prefer to use knots in load-bearing areas. For example, the junction of the strap and the back of the bag, the junction of the strap flyer and the sides of the bag, and the junction of the webbing and the fabric. Leisure bags basically use knots in the load-bearing parts. Personally, I think the weight bearing capacity of the knot is very good. If a backpack does not have a single knot on it, nor a single back stitch, then its quality is in question.
9. Double Needle
The double needle is also sewn with a special machine. This kind of machine has two needles, and can go through two threads at a time, so it is called double needle. Double needles are generally used when sewing the outside of the bag. Not only does it enhance the firmness, but the uniform parallel lines give an aesthetic feeling. The needle pitch of the double needle is generally 5-6MM wide. The needle size is generally 1 inch 6-9 needles.
The above are the basic workmanship terms when making bags, and they are often used. I think this information is still useful for backpackers. If anyone is unclear, please post to ask.