Introduction to some knowledge about die cutting i

2022-08-17
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Introduction to some knowledge about die cutting indentation

die cutting indentation is a special process in post press processing, mainly considering whether to apply it according to the design requirements. This paper mainly introduces the overall process of die-cutting indentation from the definition of die-cutting indentation, the printing plate of die-cutting indentation and the manufacturing process of die-cutting indentation

what is die cutting indentation

die cutting and indentation process is to make the edges of color prints into various shapes according to the design requirements, or add a special artistic effect on the prints, and achieve a certain use function. The process of forming a mold with a steel knife (or carving a mold with a steel plate) and punching the substrate into a certain shape on the die-cutting machine is called die-cutting process; The process of using steel wire to press out traces or leave grooves conducive to bending on the substrate through stamping is called indentation process

what is a printing plate of die cutting indentation

the printing plate used for die cutting is actually a steel wire with a sharp edge, with a height of about 23.8mm. Bend the steel wire on the fixture into various required shapes, and then form a printing plate. After embossing, the substrate is cut into the required shape. The printing plate used for indentation is also steel wire, which is slightly lower than the knife line used for die cutting (about 0.8mm lower), and there is no sharp object. After the printing plate is formed, it is pressed with it, so that there are traces on the surface of the substrate. There are special requirements to inspect the seamless tool of the oil delivery valve. It is made of a whole piece of steel. This kind of tool has high cost, but it is durable

what are the base plates of die-cutting indentation printing plates

to make a die-cutting indentation printing plate, first make a base plate, and then bend the line according to the required knife shape and place it in the base plate. There are two kinds of base plates: metal base plate and wood base plate

① metal base plate. There are many kinds of metal plates, such as lead empty layout, cast lead plate, steel plate engraving, steel plate engraving, etc. Lead space typesetting is to use lead space groups of different sizes to form a layout. Cast lead plate is made of molten lead alloy. This method is to bend the steel wire into the required shape, leave 10mm edges around, and fix the periphery with wooden strips. Then pour the molten lead alloy into it, and it will become a die-cutting blade after cooling. Steel engraving is to bend the steel strip into a curved closed frame similar to the die-cutting mark, weld the joint firmly, and grind both sides to a height of about 30mm. Then accurately plane the frame line of the cut figure, file out the knife edge according to the line, and finally heat treat it to make a die-cutting plate. This kind of die-cutting production is difficult and the process is complex. Generally, steel plates with a thickness of 25mm slightly larger than the printed image and text are used for plate engraving. The side to be processed is finely ground, then coated with photosensitive liquid and sunned. Milling the parts outside the knife edge line required by the picture and text, carving the knife edge, and finally heat treatment. Although the cost of this die-cutting blade is very high, it can be used repeatedly for a long time, and is generally suitable for shaped products with small and complex graphics. At present, lead space typesetting is widely used

② wood base plate. There are plywood, wood board, zinc wood nailing board and other kinds of wood plates. Plywood is generally 9 ~ 13 layers, with a thickness of 18 ~ 20mm. It is to transfer the design pattern to plywood, drill holes and saw seams at the strip, and then embed the die-cutting knife line and indentation line to make a die-cutting indentation plate. This method has higher quality of die cutting, and the weight of die cutting plate is light, which is shorter than the blank lead row knife plate making room. Wood plate bottom plate refers to the hard wood plate directly sawn into shape as the bottom plate. Zinc wood nailing board is to make a negative picture of the die-cutting pattern on the zinc board, nail the zinc board to the wood board, and embed a steel knife after trimming, which can be installed on the die-cutting machine. Plywood is commonly used for wood base plate

what is the manufacturing process of die-cutting indentation plate

features of foam granulator of die-cutting indentation version: made by foam granulator, commonly known as knife row. The so-called knife arrangement refers to the process operation of assembling steel knives, steel wires and hollow lining materials into a die-cutting indentation plate according to the specified requirements. At present, the basic raw materials for domestic knife arrangement operation are imported from the United States, and two kinds of hollow lining materials, namely metal lead and plywood, are used

the plywood plate is used as the blank lining material to make the template. First, the base plate should be made, and other operations are basically the same

① fabrication of base plate. It refers to drawing or drawing the die contour on the bottom plate in a certain way according to the design requirements of the product, and then sawing out the narrow groove according to the contour line after different process treatment. In the making of the base plate, the drawing of the die outline and the advantages and disadvantages of sawing are the keys to affect the quality of the printing plate. At first, the making of the base plate is all done manually. The accuracy of the die depends entirely on the individual's technical level. You must first draw the die figure on the board by hand, and then use a wire saw to manually cut along the line of the figure; At present, there has been a laser plate making system. In this system, the automatic operation is carried out until the last process. In the operation, as long as the parameters such as the overall size of the product to be die cut and the thickness of the paper are input into the electronic computer, the electronic computer can control the base plate making system to make the base plate automatically move under the laser beam according to the die drawing

② cutting and forming of steel knife (wire). The cutting and forming process of steel knife (wire) refers to the process of cutting die-cutting steel knife and steel wire into the largest forming line segment according to the design specifications and requirements, and then processing it into the required geometric shape. When shaping the knife shape, great attention should be paid to the selection of steel knives and steel wires. Rigid steel knives have high mechanical strength and poor elasticity. They should be used as straight-line row knives as far as possible and should not be bent too much; The soft steel knife has good elasticity. Try to use it as an arc cutter with large curvature. When selecting steel knives and steel wires, factors such as the thickness of the material of the die-cut product and the width of the indentation line should also be considered. The general rule is: the height and thickness of the steel wire of die-cutting products should be different with the thickness of the material. With the decrease of the thickness of the paper, the height of the steel wire increases and the thickness decreases

③ knife arrangement. According to the product design specification and shape, draw the specification sample and check it with the printed pictures and texts, and then start the knife arrangement operation. According to the different hollow lining materials used, the knife arrangement operation is slightly different. The technical requirements and process difficulties of metal hollow lead knife arrangement are generally slightly higher than those of plywood hollow lining materials. When using metal empty lead knife arrangement, the knife shape is directly fixed at the designated position of the die plate with empty lead according to certain process requirements to complete the knife arrangement operation, which is very similar to the typesetting operation in movable type printing. In the metal blank lead cutter, the operator is required to be able to flexibly and freely use various specifications of blank lining materials correctly, and the discharged imprint plate cannot be loose or cross-linked in the die-cutting process. In particular, when arranging various geometric figures, it is necessary to ensure that the graphics are standardized and the tightness is appropriate. When there are multiple drawings in one version, they should be consistent with each other, and there should be no difference due to the different magnification of empty lead added. In addition, after the knife is arranged, the vertical lines of each point on the opposite side of the printing plate should be equidistant, so as to facilitate clamping and fastening when fixing the knife. In the operation of cutting with plywood lining materials, the steel knife and steel wire should be inserted into the sawing seam of the base plate. Can it be tested with a tensile testing machine? The plane should be vertical, and the gap should be appropriate. There should be no deformation or twisting in the embedding or processing. If the layout is composed of multiple base plates, a single base plate should be arranged and shaped first, then arranged and shaped one by one, and finally clamped and fixed uniformly. After the printing plate is arranged, its vertical and horizontal lines should form 90 angles to each other, and the side lines should be parallel to each other, so that the whole layout can be flat. In addition, the steel knife and steel wire interfaces should be arranged in a proper position, and the interface clearance should be appropriate, and the phenomenon of overlap or excessive clearance due to pressure should not occur

④ check and fix the knife. Some solid knives are also called printing or card printing, which means that the arranged printing plates are stuck in the plate frame. After the knife arrangement is completed, conduct a comprehensive inspection again, and the knife fixation can be officially started only after it is verified to be correct. For the plate fixing knife with empty lead as the lining material, after putting wooden strips around the plate frame, use the plate fixing lock to fix it directly; For the die-cutting plate with plywood as the lining material, according to the specific situation of the whole plate, after putting wooden strips, it should be firmly fastened by the fixed plate lock clip

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