1. Folded edge (purse edge)
Folded edge refers to the piece cut 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 over the star. Fold the edge of the use of adhesives depending on the different properties of leather, using different types. Usually with neoprene, gasoline glue and polyvinyl alcohol, etc..
The amount of folding required is usually 6~20mm, and the parts of the product are folded to get a smooth and neat appearance of the edge shape, which creates favorable conditions for product assembly.
According to the law of the edge shape of various bags, folding edge can be roughly divided into folded straight edge, folded concave edge, folded convex edge, folded concave convex edge four forms. In these four forms, there are folded virtual edge, folded real edge. The main difference is that they are not lined in the virtual edge, while the solid edge lined with cardboard.
Folding the edge of the tools needed are: hammer, scissors, awl, etc.
(1) Folding straight edge
Folding the virtual straight edge is relatively simple and easy, before folding the edge of the required parts edge cutting straight, uniform thickness. According to the different product requirements, first draw the line according to the amount of folding regulations, the purpose is to ensure that the edge is straight after folding. Then apply adhesive on the edges of the leather after folding to adhere firmly, and use a hammer to knock flat service. If the leather is hard, available neoprene bonding. Apply neoprene on the folded leather need to wait for the adhesive to dry (no stickiness to the touch) before folding the edge and knocking firmly.
When folding the straight edge, the solid edge has a lining. First, the piece of fabric over the edge glued to the lining, outside the lining to retain the folded edge skin, coated with adhesive, and then: the folded edge skin glued to the edge of the lining, so that the edge of the lining is not exposed.
(2) Folding concave edge
Concave edge folding is more complicated than straight edge folding. Because the inner contour line of the concave edge is smaller than the contour line of the folded edge, before folding the edge, the inner contour must be equal to or slightly larger than the contour line of the folded edge, in order to fold the edge well folded firmly, which requires the inner contour line elongation. The solution is to use scissors or scoring knife to provide the required elongation of the fork on the edge of the inner contour line, to achieve the inner contour line equal to or greater than the folded
The contour line size of the folded edge.
Before folding the edge (false edge) first draw a good fold line on the edge of the folded part and apply adhesive. Use scissors on the folded edge skin fork, fork depth of 2/3 or 3/4 of the folded edge, fork and fork width of 2 ~ 4mm. Then the folded edge skin glued in accordance with the painted folded edge line. Folded edge contour line should be folded neatly, natural, not distorted sticky hollow, milk fork mouth can not be exposed edge.
Fold the solid edge, first in the glued lining of the folded edge of the skin Xu on the adhesive, with scissors in the folded edge of the skin on the fork. The depth of the fork is 1/2 or 2/3 of the folded edge, and the width of the fork and fork is 3-5 mm. then scrape the folded edge along the edge of the folded edge to ensure that the folded edge is not empty or curved. Use your fingers to snap the edge of the folded skin on the edge of the lining, and use a hammer to knock the flat service.
(3) Folding convex edge
Folding convex edge is the opposite of folding concave edge, because the outer contour line of the folded leather is larger than the actual contour line of the folded edge, the outer contour line of the folded leather needs to be shortened to less than the contour line of the folded edge. Therefore, it is necessary to pleat the folded leather to shorten the length of the outer contour line to achieve the purpose of smaller than the contour line of the folded edge.
Before folding, draw a good fold line on the edge of the folded part, apply adhesive, and then fold the folded skin down, while using an awl to pleat the edge of the folded skin, if the folded skin is thicker and the pleats are larger, you can use a knife to thin the folded skin first, so that the pleated pleats are flat. When folding the edges, the pleats should be evenly small and flat, and the outline after folding should be round, natural and flat. After folding, if the pleated part of the pleats thicker affect the combination of mosaic, available piece of knife to cut the pleats flat. Folded solid edge is basically the same as the virtual edge, but must pay attention to the leather and the lining should be no gap between to ensure the quality of the folded edge.
(4) Fold the concave and convex (lace) edge
Because the concave and convex edge edge shape is more complex, concave and convex, fold the edge of the concave edge can refer to the operation process of folding concave edge, fold the edge of the convex edge can refer to the operation process of folding convex edge, but must pay attention to the concave and convex turn when the edge shape of the round and smooth.
(5) Folded by the rib
Folding by rib means gluing the cardboard rib on the edge of the part lining to form a bulge to decorate the edge of the part, then gluing the fabric after this operation, and finally folding the edge as required. The operation is as follows:
①Glued paperboard rib: cut the cardboard into 5~8mm wide cardboard rib, apply adhesive on the cardboard rib, glue the cardboard rib on the edge of the part liner, the position of the cardboard rib is 5mm from the edge, wait for the adhesive to dry, then use sandpaper to round the outline of the cardboard rib.
②Gluing fabric: cut the fabric piece and draw the folded edge line, apply adhesive on the liner, and laminate the fabric to the liner coated with adhesive. On, the skin surface pushed flat service, next to the cardboard tendons, cardboard tendons at the edges to be tightly by firm, can not have loose, empty phenomenon.
③ Fold the edge: the reverse side of the bonded fabric parts up flat on the table, coated with adhesive, and then fold the edges of the parts. The folded edge is required to be straight, no loose, empty phenomenon.
2. Dyeing edge
Dyeing edge is a common method of edge trimming, it is operated as follows:
( 1) Cutting edge
According to the process requirements to cut the edge straight, no burr edge.
(2)Starting line
Use iron or iron in the cut edge on the line, require clear lines, while not to burn the leather surface.
(3)Sanding edge
Use sandpaper to sand on the edges, and grind away the lint on the edges of the parts to make the surface of the parts smooth.
(4)Dyeing
Dyeing according to the color required on the process, dyeing temperature - generally 30 ~ 40C.
(5)Wipe light
Wipe on the edge of the parts on the bright agent, wipe bright agent number of times to 3-4 times is appropriate, pay attention to before the second wipe operation, to ensure that the wipe out of the edge of the bright uniform.
3. Rolling edge
There are two kinds of rolled edge: the original color edge and the different color edge. Before rolling the edge, cut the rolled edge strip, and cut the edge piece of the parts, rolled edge strip - general requirements through the piece, the thickness of 0.3 ~ 0.5mm, the parts and rolled edge strip bonding, and then sewn on the sewing machine.
4. Hemming (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. The procedure is as follows:
The thickness of the edge of the part to be hemmed is cut evenly. Ensure that the edges are of uniform thickness.
Cut a strip of leather with a width of 15-20mm, length depending on the need, from a leather or thick leather, and slice it by the slicer until one side is sloped. When edging, apply adhesive on the edges of the cut parts, then glue the edging strips on the edges, push them flat and hammer them firmly.
When setting concave or convex edges, it is necessary to bend the edging strips after wetting (leather is plastic after wetting) to the required convexity of the edges, and then glue the edging strips firmly. When the thickness of the leather is greater than 2mm, it does not need edging.
5. Ruffle the edge
When ruffling, first of all, the edge of the parts will be sanded round, in the edge of the parts of the hole, and then interspersed with leather strips, thick line and other materials to ruffle the seam, requiring an even seam.
