(1) Skimming
Trim blank pieces to standard templates.
(2) edge trimming
According to the technical requirements, the leather fabric or cardboard is thinned around the edges, and the depth and width of the chipping vary with the technical requirements.
(3) Seal all around
Fit the fabric or lining and the lining according to the requirements, and sew them together with larger stitches along the circumference to form a whole, so as to facilitate the processing of the subsequent process.
(4) Cut the mouth
Cut off the excess fabric that affects the sewing appearance due to the overlapping thickness after sewing of thicker fabrics such as leather at the bent or curved parts, so that the seams are smooth and smooth.
(5) Brush glue
Temporary bonding of the stitched parts before sewing is beneficial to the progress of the sewing process.
(6) Make a pen insert
The pen insert is an internal part of the bag and should be done before sewing the internal parts.
(7) Roll bag mouth
Wrap the raw edge pockets with piping.
(8) Seizing the bag insert
Pin the panels to both ends of the opening line.
(9) Open the bag
Cut along the pink line the middle part of the pocket where the rule has been sewn.
(10) Sealing bag mouth
The two ends of the bag mouth are sealed with a reverse needle.
(11) Repair the pick-up mouth
Narrow the burrs that have been seized. Generally, there are two methods of repairing both sides and single repairing one side.
(12)Through sheet
The process of chipping the whole piece of parts.
(13) Direct chipping
Refers to the method of direct chipping by hand until it meets the technological requirements.
(14) Indirect chipping
It is to "change the knife" to trim the edges of the parts that have been sliced on the peeling machine. If the chipping slope of machine chipped parts is not straight, it will cause unevenness of the mating surface when the part is mounted on the part, resulting in product defects. Therefore, the chipping quality must be corrected by manual secondary chipping.
(15) Folded edge
Is a piece of cutting over the edge of the parts, according to the technical requirements of the edge of the excess part of the leather folded down, with adhesive bonding process.
( 16) Fold the virtual straight edge
Fold the virtual straight edge is relatively simple, before folding the edge of the part requires the edge of the piece cut straight, uniform thickness. According to different product requirements, first draw lines according to the amount of folding regulations, the purpose is to ensure that the edge is straight after folding. Then apply adhesive on the edge to adhere it firmly after folding, and knock it flat with a hammer.
(17) Folding straight edge
When folding the straight edge, first glue the fabric over the edge on the lining, and keep the folded skin outside the lining. Apply adhesive, and then fold the edge of the folded leather glued to the edge of the lining, so that the edge of the lining is not exposed.
(18) Folded concave edge
Folding concave edge is more complicated than straight edge folding. Because the concave edge of the inner contour line is smaller than the contour line of the folded edge, before folding the edge to make the inner contour equal to or slightly larger than the contour line of the folded edge, in order to fold the edge well folded firmly, then you need to make the inner contour line elongation. The solution is to use scissors or scoring knife to provide the required elongation of the fork in the edge of the inner contour line, to achieve the inner contour line equal to or greater than the size of the contour line of the folded edge.
(19) Folded convex edge
Folding convex edge is the opposite of folding concave edge, because the outer contour line of the folded edge is larger than the actual contour line of the folded edge. When folding the edge, it is necessary to shorten the outer contour line of the folded skin to a size smaller than the contour line of the folded edge. Therefore, it is necessary to pleat the folded skin to shorten the length of the outer contour line, to achieve the purpose of the year less than the contour line of the folded edge.
(20)Fold the concave and convex (lace) edge
As the concave and convex edges are more complex, concave and convex, folding the concave edge of the folded edge can refer to the operation process of the folded concave edge, folding the convex edge of the base can refer to the operation process of the folded convex edge, but - must pay attention to the rounding of the edge when the concave and convex fold.
(21) By the tendon folding edge
Folding by rib means gluing cardboard rib on the edge of the part lining, thus forming a bulge to decorate the edge of the part, then gluing the fabric after this operation, and finally folding the edge as required.
(22) Dyed edge
Dyeing the edges is a common method of edge trimming.
(23)Rolled edge
There are two kinds of rolled edges: natural color edges and different color edges. Before rolling the edge, cut the rolled edge strip and cut the edge piece of the part, rolled edge strip is generally required through the piece, the thickness is 0.3-0.5mm, the part is glued with the rolled edge strip, and then sewn on the sewing machine.
(24) Edging (raw edge)
Edge trimming is another process method of edge trimming, because the thickness of the leather itself sometimes does not meet the needs of the product, in order to ensure that the edge thickness required, the method of edge trimming to achieve the thickness of the edge of the parts specified.
(25 ) Ruffling
When ruffling the edge, first of all, the edge of the part should be sanded and rounded, and the hole should be punched at the edge of the part, and then the material such as leather strip and thick thread should be used to The seam must be evenly stitched.
(26) Flat setting
The flat inlay process is generally used for flat inlays. When used in the box, the inlays are not sewn. Therefore, the joints are required to be firmly bonded. Generally, neoprene with good viscosity is used.
(27) Stubble splicing
Stubble splicing refers to the splicing method in which the edge of one part is overlapped and pressed on the edge of another part. The stubble splicing process is generally used for the connection of luggage and leather bag parts.
(28) Docking
Butt joint is to bring two parts together on both sides - in a plane without any overlap in between. It is required that the edges of the parts to be butted should be cut straight, and the butt joints should be smooth.
(29) Press seam stitching
The seam stitching process consists of two steps, the first is to butt the edges of the two parts on a plane, and the second is to cover the designed parts or decorative parts on the seam and stitch them with stitches, so that the parts are joined together. Seams are hidden.
(30) Parts are cored
It is to fill the middle of the two parts with a raised core material, so that the surface of the part forms a concave-convex three-dimensional effect, and the shape is more beautiful after molding.
(31) Pinch pleated corners
Mainly used for higher-end leather luggage products. When operating, first cut off the excess part of the corner material, apply 240 adhesive on the edge, and then fold the straight edges on both sides of the corner to make them straight. When operating, pay attention to evenly pinch the pleats, and the number of pleats at the four corners should be equal. Generally, it is better to fold and pinch 6~8 pleats at each corner, so as to ensure the roundness of the corner arc. After the corner is folded and pinched, use a hammer to level it.
(32) Branding
The leather logo is engraved on the copper mold using high temperature and high pressure on a hot press (sometimes an aluminum mold is also used, and the effect is not as good as the copper mold). The writing on it is stamped on the leather surface. When operating, it is required to pay attention to: to select the appropriate temperature and pressure, act on the appropriate material, so as to meet the customer's product requirements.
(33) Tape
During operation, on some positions or parts that are not suitable for applying adhesive, tapes can be used to fix them. Many factories use double-sided tapes with different widths to produce temporary bonding for the convenience of subsequent operations.
(34) Stubble sewing method
The stubble seam method is often used in the production process of products. This sewing method is to first refract the edge of the upper pressure piece (also has burrs), draw stitches on the edge of the lower pressure piece and apply adhesive, the edge of the lower pressure piece is shaving the surface layer, and then the edge of the upper pressure piece is cut. Press on the edge of the lower pressure piece, and the two parts overlap each other. The width of the overlap depends on the number of stitches required, generally 8~15mm.
(35) Reverse seam method
The reverse sewing method is to sew the two parts on the sewing machine by overlapping the surfaces, and the stitches are sewn on the reverse side of the parts. Before sewing, the edges of the two parts are cut evenly, and the edges are trimmed with a knife.
(36) Turn over seam
Turning seam is carried out on the basis of reverse seam, and can be used for the edge, edge, bottom of bag, etc. of luggage products. Before sewing, cut the thick slices on the edge of the parts evenly. When sewing, the two parts that have been cut are overlapped with the surfaces and aligned on both sides. First, sew a line 2~3mm away from the edge, and then spread the two parts flat to make The reverse side coincides with the reverse side, scrape the seam flat, and then sew a line 3mm or 10~15mm away from the edge. The first seam of this sewing method is not exposed, and the second and third seams make the parts sew firmly, and the edges are flat and smooth.
(37) Rolled seam
Rolling seam is based on backstitching. It is generally used to roll the edges of the parts. Before stitching, the thick and thin slices of the edge of the part are cut evenly, and the rolled strip is cut, and the two sides of the sliced part are reunited with the face when stitching. First, sew a line at 2~3mm from the edge. Then, unfold the two parts and fold the strip to the opposite side. Apply adhesive on the reverse side of the strip, and apply adhesive on the top of the reverse side of the edge of the part to make the strip stick to the edge, and sew a line on the edge of the front side of the strip.
(38 ) Overlocked seam
Before sewing, the edge of the part is cut straight, the position of the edge line is drawn, the edge is cut, and the thickness of the edge is cut evenly, generally 0.3~0.6mm. When sewing, the reverse side of the edge is coated with adhesive, and the edge is glued to the edge of the other part. The edges of both sides of the wrap are aligned with the drawn lines to ensure a straight edge. After the adhesive dries, sew a line 2~4mm from the edge of the wrap-around skin.
(39) Inset seam
Inlaid seam is inlaid line in the middle of the two parts connected sewing, inlaid line has a solid core inlaid line and false core inlaid line two. The inlaid seam process is generally used for the connection of soft box, soft structure package of the fan and the wall and other parts.
(40) Flat seam
Flat seam is a method of sewing lines on a flat surface. This type of stitching is often used only for decoration, i.e. on a single part that does not require stitching. The stitching is done by first drawing a pattern pattern on the surface and then following the drawn stitches.
(41 ) Zigzag stitching method
The zigzag stitching method is a method of splicing two parts after docking. Both parts do not require a sewing allowance, and the presser foot of the sewing machine moves back and forth between the two parts with a zigzag stitch. It is generally used for the splicing of edges and the decoration of parts.
(42) Stitching
The stitch path formed on the sewing material when the needle pierces the sewing material.
(43)Stitch
The form of stitch configured between two adjacent needle eyes on a sewn object.
(44) Stitch track
The interconnected stitch traces formed on the material piece.
(45)Stitch type
The configuration of a certain number of pieces of material and stitches in the sewing process.
(46)Stitch density
The number of stitches in a specified length, also called stitch density.
