The main production process of leather goods
Binding edge—— a variety of edge bones used to form a backing or to enhance the shape of a handbag. There are coreless leather bones, leather bones with a rubber core, cotton core, spring or wire core, man-made material edge bones and rubber bones without leather covering.
Flat stitching——refers to a process of joining single or multi-layer overlapping parts using a flat stitching machine (i.e. flat carriage) and is one of the most used processes in leather sewing, suitable for joining parts in the relative plane of leather products or for sewing decorative lines.
The inner seam—— also known as the hidden seam or buried pocket, is a traditional process where the edges of two parts are sewn together face to face and then turned over so that the seam is visible but the stitching is not. It is a traditional process in which two parts are sewn together face to face and then turned over so that the seam is visible but not the stitching.
There are various methods of headstitching, suitable for joining the inner and outer parts and for making soft bags.
Open stitching—— also known as outer stitching, is a traditional technique where the inner layers of two joined parts are sewn together opposite each other so that the facing and bottom stitches are visible. It is also available as a hand stitch and as a high head stitch, and is suitable for the final stitching process of the pocket and cross head three-dimensional structure of soft and shaped handbags.
Bound edge internal stitching——is a decorative traditional process of sewing the edge of one of the components onto the edge bone and then attaching it to the edge of another related component for internal stitching, suitable for the design and production of the middle compartment of an upholstered or shaped handbag.
The open stitching of the edges——is a decorative process in which a decorative edge bone is sandwiched between the edges of two parts of the oiled or folded edges, using an open stitching process.
The plain stitch is a decorative and traditional process of wrapping the edges of flat parts or the outline of three-dimensional structures with strips of leather (or strips of artificial leather, cloth, etc.) of a certain width, with loose edges, single-folded edges, double-folded edges, as well as a variety of reverse edges and nylon webbing inside the edges. The hemming of flat parts is sewn with a flat stitching machine, while the hemming of three-dimensional structures is sewn with a high head stitching machine, suitable for all leather goods designs and production.
Oiled edges—— also known as loose edge oiling, is a decorative traditional process in which the edges of leather goods components or the three-dimensional contours of the fit are polished and then rolled with a layer of leather edge oil. The method of oiling the edges can be divided into two types: the thick oiling method with different processing techniques and the thin oiling method which only improves the colour of the edges. The thick oil method is suitable for the processing of high-grade leather products, requiring a smooth and full edge; the thin oil method is common to both hard and soft leather, but its edges are visible as rough fibres and fitted seams, mostly used in the processing of casual handbags.
Folded edge—— the edge of the product parts shovel thin or directly in the lining, artificial material edge coated with glue (or paste double-sided tape), to the inner layer of the folded man 2 points or 2 and a half minutes (British unit of length 1 point = 1/8 inch) of a traditional process, suitable for a variety of artificial leather bag material and leather products parts processing.
The semi-open seam—— is a fashionable process in which the different layers of the components are laminated into a three-dimensional structure and then sewn with a special pillar or swing head lathe. This process is suitable for sewing the bottom of bags that cannot be turned over and for three-dimensional enclosed appliqués, which have the effect of a three-dimensional process in which only the lines are visible from the outside but not the bottom line. The difference is that the flat seam carriage is suitable for flat seams, while the pillar carriage and swing head carriage are suitable for three-dimensional seams.
The above are important processes in the design and production of leather goods. In addition, there are many other processes in the production and assembly process, which are also techniques that must be mastered by manual workers in the various process flows. For the designer, only a certain degree of knowledge of the various processes is required in practice and can be used as a reference factor in product design. When the designer wants to make changes to some key processes, he or she has to use diagrams or text to supplement the explanations and verbal explanations, emphasising the special effects of the process changes and the methods of change.