Line is one of the necessary materials in production, which can be roughly divided into four categories according to the commonly used ones

1. Generally, the distance between open stitches is 3cm9.5 stitches; the dark stitches are 3cm9 stitches; the positioning is 3cm9 stitches ± 1 stitches.

2. In general, the needle distance of open thread is 3cm9; that of dark line is 3cm8.5; the positioning is 3cm8 ± 1.

3. Generally, the needle distance of open thread is 3cm9; that of dark thread is 3cm8.5.

4. The stitch distance between Pu and canvas is 3cm8.5cm, and that of fabric is 3cm8.5.

When we are preparing for production, we should first adjust the stitch distance and stitch. The general requirements are as follows: clear and straight stitch, moderate tightness, no thread throwing and needle skipping. No wiring is allowed on the surface of the bag body (especially the boutique bag). The dark wire is allowed to have wiring, but it must be rewired for 7-10 pins, and the back and forth pins must be inverted.

According to different product requirements to choose the line, do not arbitrarily use the color, specifications of different lines.

1. Positioning

Positioning is to fix two or more layers of materials together. Before positioning, the front and back sides of materials and the direction of pattern must be recognized. Generally speaking, the seam should be 2-5mm, not too wide, and the surface fabric should be flat, wrinkle free and not twisted. There should be no thread ends, sundries and dirty spots in the interlayer (especially light colored ones).

2. Reverse needle

In order to increase the firmness of the stitches, in addition to the stitching starting and closing, the back stitches are also needed at the places that need to bear the weight, such as the two ends of the zipper, the strap and the loop of the pendant. The back and forth needle must be in the same line.

3. Trademark

Trademark is the mark of a product, so it is not allowed to be careless. Before driving, it is necessary to see whether the picture and text of the trademark are clear and whether there is skewness (including printing label, weaving label, leather label and washing label). Generally, the stitches should be lifted and retracted at the bottom of the trademark, and 3-4 stitches and threads must be re placed on a straight line. The sewing should be done in strict accordance with the positioning. The materials should have positioning holes or draw positioning points. The trademark must cover the points. Printing mark and woven mark shall not have exposed angle and skew during overlapping sewing.

4. Joint

Stitching is to put two layers of fabric together, which is the main process on the bag. It is required that the stop should be straight and the width should be the same, and the back and forth needles (2-3) should be poured well when starting and withdrawing needles.

5. Zipper

The zipper is the most important part of the bag. Its quality must be perfect. The quality of the zipper and the zipper head are not allowed to have quality defects. When the chain side dumper zipper is used, the direction of the zipper head can not be reversed. The distance between the zipper teeth and the material edge is 3mm, and the stop should be uniform and straight. If double lines are needed, the double lines should be even and straight, and the edge material and zipper should be flat without wave phenomenon.

6. Bag circumference

The appearance of the whole bag is closely related to the circumference of the bag. The bag should be aligned with the positioning gap, and the tail of the zipper should not be scattered. If double lines are needed, the double lines should be even and straight. If the bag circumference is too long or too short, it will cause the package to skew or wrinkle. In principle, try to close the bag before connecting the bag girth, so that it can be produced if it is suitable.

7. Wire embedding

Inlay line is the framework of bag. According to the requirements of different styles of bags, different materials of inlay line should be selected. The embedding line should be tightly wrapped and the upper and lower seam should be even. Generally, the inlay foot should be aligned with the edge distance of the fabric. The inlay edge should be straight, the corner should be smooth, the fillet should be round and even, and the connector with connector should be in the middle and close to each other.

8. Package

Bag closing is the main process of bag forming. For bags with embedded thread, the package should be full and can't eat thread. The size of bag circumference and bag body piece should be appropriate. If the bag circumference is too large, the bag will wrinkle after closing. If the bag circumference is too small, the closed bag will easily deform and skew. Note that the direction of the zipper head should not be reversed. To distinguish the front and the back, the main purpose of the package is to pay attention to the symmetrical effect (including front and back, left and right, upper and lower).

9. Hemming

The hemming is divided into outer hemming and inner hemming. In particular, the width of the upper and lower lip should be uniform and straight, the width should be consistent, the corner should be smooth, and the fillet should be round and straight. The hemming must cover the wrapping line. The fabric at the edge of the edging should not wrinkle, slip or leak. For bags with inlaid thread, pay attention not to eat thread when wrapping inside. The end of the ribbon should be folded or hot pressed according to the requirements, and the back and forth needles (2-3 can be used) should be poured in the same straight line for the direct end closing.

10. Hemming

The edge of the seam should be cut off smoothly.

11. Installation of accessories

The bumping nail and button shall be in strict accordance with the positioning point. The bumping nail shall be flat, and shall not be skewed or loose. The surface of accessories shall be smooth and upright, and the coating shall not be shelled or fallen off, and the installation shall be firm.

In fact, it is not very difficult to do a good job in each process. The most important thing is that we should know the key points, such as whether the seam stop, needle pitch and stitch meet the requirements, and whether the carrying belt and accessories are parallel and symmetrical. These are the basis for making bags.