According to the requirements of different luggage products to choose the line, do not arbitrarily use different colors and specifications of the line. The following is the specific operation process:

　　First, positioning. It is to fix two or more layers of material together, and it is necessary to recognize the front and back of the material and the direction of the pattern before positioning. Generally, the stop of the positioning is 2 ~ 5mm, not too wide, and the table fabric should be flat, wrinkl-free, and not twisted. The interlayer can not be wired head, debris, dirty points, etc., especially pay attention to the light color.

　　Second, reverse the needle. The reverse stitch is to increase the fastness, in addition to the sewing up and closing of the needle need to reverse the needle, the general need to bear the weight of the place also need to return to the needle, such as the two ends of the sewing zipper, the belt, the pendant loop. The back and forth pins must fall in the same straight line.

　　Three. Trademarks. Trademark is the logo of the product, not sloppy, before the car to see whether the logo is clear, there is no skew (including printing mark, woven mark, leather mark, washing mark), under normal circumstances in the bottom of the trademark, closing, closing to weigh 3 ~ 4 stitches, and must be heavy in a straight line. In strict accordance with the positioning stitch, the material has a positioning hole or a positioning point, and the trademark must cover the point. The printing mark and the weaving mark should not have exposed corners or skew when folding and sewing.

　　Fourth, sew. Sewing is to bring two layers of fabric together, which is the main process of the bag. It is required that the stop is straight, the width is the same, and the stitches should be inverted back and forth, 2 to 3 stitches can be.

　　Five, zipper. The zipper is the most important of all parts on the bag, its quality must be perfect, the zipper and the zipper head are not allowed to have quality defects, when the chain side skip zipper, 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. Need the car double line, double line to be uniform, flat and straight, the edge material and zipper to flat, there can be no wave phenomenon.

　　Six, surround. The appearance of the whole package is inseparable from the surrounding. The encircling should be aligned with the positioning gap, the zipper tail can not be spread, the car needs double lines, the double lines should be uniform and straight, the encircling is too long or too short will cause the package to be crooked or wrinkled, in principle, before the encircling should be tried to close the package, suitable for production.

　　Seven, wiring. The embedding line is the skeleton of the bag, according to the requirements of different styles of bags to choose different materials of the embedding line, the embedding line should be wrapped tightly, the upper and lower stop should be uniform, the disk embedding line is generally required to align the embedding foot with the fabric edge, the embedding edge should be straight, the corner is smooth, the rounded corner is round, the four corners are uniform, and the connecting piece should be centered and close.

　　Eight, the package. Closing a bag is the main process of bag forming, for the bag with an inlay line, the closing bag requires full, and can not eat the inlay line. The size of the encirclement and the package piece should be appropriate, the encirclement will wrinkle after the encirclement is too large, and the encirclement of the bag is too small and the bag is easy to deform, and the phenomenon of crooked bag appears. It should be noted that the direction of the zipper head cannot be reversed (refers to the single zipper head). To distinguish between front and back, the main thing to pay attention to is the symmetrical effect, including front and back, left and right, up and down.

　　Nine, wrap the edge. The outer edge is divided into the outer edge and the inner edge, especially the outer edge requires the upper and lower edge width to be uniform and straight, the width and width are consistent, the corner is smooth, and the rounded corner is round. The edge of the bag must cover the closed bag line, and the fabric on the edge of the bag can not be wrinkled, and there can be no slip or leakage of the bag. Bag with embedded line, inside the edge should be careful not to eat the embedded line (refers to the car to the embedded line). The knitting head should be folded or hot according to the requirements, and the direct head needs to be inverted back and forth, and must be poured in the same straight line.

　　Ten. Cuff edges. The sealing edge should be uniform and straight, with the same width and width, and the corner should be smooth. The sealing line should be copied to the outside of the sewing line, and the sealing edge should not be cut off.