Basic knowledge about luggage and handbags
The net height, net length, and net width do not include the actual height, length, and width data of the edge positions such as hemming, embedding, and overlapping.
The shape line draws a virtual line of the size and shape of the bag body on the paper grid in advance. From the virtual line, the rough appearance of the bag body can be seen.
In order to facilitate the alignment or emphasis of the position when making the teeth, the small triangle cut on the paper grid has a cut depth of about 0.5 minutes.
Folding In order to prevent the edge of the part from revealing its material, a certain width is added, and then a process of folding and bonding, the additional width is 2.5 points.
The joint part and the part need to be seamed, and the part of the part on the lower side that is covered by the part has a width of 2.5 minutes.
Car parts and components need to be stitched on the back of the material, and the edges of the parts and components are the same shape of a stitching process (the front line of the material cannot be seen), and the additional width is 2 minutes.
The two edges of the refusal notch are reverse stitched on the back of the material, and a sewing process that changes from flat to three-dimensional. The additional edge position is 2 points.
Embedding two parts with different shapes requires a sewing process in which the back of the material is stitched and connected (the front line of the material cannot be seen), and the additional width is 2 minutes.
The edge interface of the two parts of the car's reverse lapel line is reversed by the car on the back of the material, and then an upper thread is sewn on each side of the material along the suture centerline to beautify and strengthen.
In order to make the cut edge of the part not exposed, the oil edge is directly coated with oil on the cut, so as to achieve a material that covers its stubble and a beautiful cut.
In order to keep the edge of the part from being exposed, a long process of directly gluing and pressing seam is used to cover the edge of the cut with a long bundle of material. In order to make the package more rigid, the side bones are wrapped with rubber cores or steel wire cores in the middle of the bundle, and fixed when clamped. The side aggregate is mostly 6 minutes wide (the width of coarse aggregate is different).
Commonly used tools are utility knives (or straight steel knives-use a wide blade to grind a broken blade), steel rulers (often with inch scales and metric scales, and 12 inch and 24 inch lengths are more often used), tape measures (Soft ruler), awl, compasses, ballpoint pen, pencil and 250 grams of white cardboard. A complete piece of paper is mostly symmetrical. Therefore, we must first find a central axis when out of the grid, so as long as you cut one side, you will get two symmetrical edges. The central axis is drawn on the jammed paper. When cutting, the left hand finger presses the middle of the steel ruler, and the right hand holds the utility knife so that the angle between the blade and the jam is about 300, and then gently cuts along the outer side of the steel ruler to draw a straight The shallower notch (but not through the jammed paper) serves as the central axis. Find a point by turning back the central axis, and then spread out the jammed paper to connect the symmetrical points on both sides of the central axis to cut a straight edge. Some paper grids are not only symmetrical from side to side, but also from top to bottom. This requires an additional central axis in the vertical direction of the first central axis, which is what we often call crosshairs. The method is to fold out the first central axis in the short direction of an irregular blank paper jam, fold it, and then pierce the two with a knife tip at a place far away from the first central axis and tend to be in the middle of the central axis Find the corresponding point on the layer paper jam, then spread the paper jam, connect these two corresponding points with a steel ruler, and cut to get another central axis. The two central axes intersect perpendicularly and there is an intersection in the middle. In this way, you can find a point to cut according to actual needs. If you want to make a standard and perfect paper grid, you must not only skillfully use a steel ruler and cut it straight, but also practice a lot on the cutting of arc bends.