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How to make a die-cutting version of a handbag!

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How to make a die-cutting version of a handbag
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making flat die-cutting plate – deformation fission
die-cutting indentation process is a process of rolling and forming printed matter under the action of pressure by using the template arranged by steel knife and steel wire. Its processing effect is that the surface of printed matter has both deformation (indentation) and fission (die cutting)

the production of die-cutting plate, commonly known as knife arrangement, refers to the technological operation process of assembling steel knife, steel wire and hollow lining materials into die-cutting plate according to the specified requirements. The general process of making the die-cutting plate is as follows:

drawing the outline of the die-cutting plate → cutting the base plate → cutting and forming with steel knife and steel wire → combination and assembly → opening the connection point → pasting sponge rubber strip → trial cutting the pad plate → making the impression bottom mold → trial die-cutting and sample signing

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I. drawing the wheel outline of the die-cutting plate

first, the die-cutting plate layout shall be designed according to the requirements. The tasks of layout design include: (1) determining the size of the layout, It shall match the specification and working capacity of the selected equipment; (2) Determine the type of die cutting plate; (3) Select the material and specification of die cutting plate. The designed layout shall meet the following requirements, that is, the grid position of die-cutting plate shall be consistent with that of printing; The working part shall be located in the center of the die-cutting plate; The transplantation of lines and graphics shall ensure the accuracy required by the product; The cutting lines of the layout shall be straight, and the vertical and horizontal cutting lines shall be at right angles to each other and parallel to the side of the die-cutting plate; The broken knife and line shall be aligned

the outline drawing of die-cutting plate is the expansion drawing of the whole plate product and the first key link in the production of die-cutting plate. The template cutting system can be used in the whole printing process to ensure the effective output of the template. If the printing adopts manual film composition, it is necessary to draw the outline of die-cutting plate according to the actual size of printing sample layout. In the process of drawing, in order to ensure that the die-cutting plate does not scatter during plate making, several “bridges” should be reserved in the large-area closed graphic part. The bridge width can be designed as 3 ~ 6mm for small plate and 8 ~ 9mm for large plate. In order to make the steel knife and steel wire of the die-cutting plate have better die-cutting suitability, the following problems should be paid attention to in product design and layout drawing:

1. The knife line of slotting and opening should adopt the whole line as far as possible, and the corner of the line should be provided with fillet to prevent the splicing of mutually perpendicular steel knives

2. Sharp corners shall be prevented at the joint of the two lines

3. Avoid the connection of multiple adjacent narrow waste edges, and increase the connection part to make it connected into a piece for waste removal

4. Prevent multiple continuous sharp corners. Sharp corners without functional requirements can be changed into rounded corners

5. Prevent the sharp corner line from ending at the middle section of another straight line, which will make it difficult to fix the knife, the steel knife is easy to loosen, and reduce the die cutting suitability. It should be changed to circular arc or increase its meeting angle

II. Cutting template (slotting)

the commonly used blank lining materials (base plate) of die-cutting template include metal blank lining materials and non-metallic blank materials; Among them, multilayer plywood is used most, and the thickness of plywood is generally 18 ~ 20mm. The cutting of base plate (hollow lining material) mainly includes sawing machine cutting, laser cutting and other methods

sawing machine cutting is the main method for small and medium-sized enterprises to process the die-cutting plate by themselves. The work of sawing machine is to use the up and down movement of special saw blade to process a narrow groove on the bottom plate that can be loaded with steel knife and steel wire. The thickness of saw blade is equal to the thickness of steel knife and steel wire at the corresponding position. The sawing machine is equipped with an electric drill, which can drill holes on the bottom plate. After drilling, the saw blade passes through the bottom plate and then cut. The current sawing machines have rich specifications and perfect functions according to the use occasions and plate making types. Some sawing machines are equipped with dust suction system, which can automatically collect the sawdust cut, the saw blade can be clamped electrically, and some large layout sawing machines are also equipped with air flotation system on the worktable. It can make the sawing of large layout light and flexible. In recent years, CAD /CAM technology has also been applied to the production of die-cutting plate. Its principle is to use CAD /CAM technology and computer control technology to control the sawing machine to complete cutting and greatly improve the slotting quality

laser cutting is carried out on a computer-controlled laser cutting machine. It uses laser as energy to cut the substrate material through the high temperature generated by laser. For laser cutting, first of all, it is necessary to input the whole die cutting outline into the computer, and the computer controls the movement of the base plate and cut with laser. However, many parameters are needed in the cutting process, such as material quality parameters, plate thickness, laser output power, type and pressure of auxiliary gas, diameter and diameter of nozzle, distance and gap between material and nozzle, focal length of lens, position of focus and cutting speed. Therefore, in actual production, it is extremely important to learn from previous experience to determine the processing effect. The main disadvantage of laser cutting is that the laser cutting machine is expensive and the cutting cost is high, which makes the production cost of die-cutting plate higher. Therefore, this kind of die-cutting plate is generally produced by professional manufacturers and directly customized by users

III. forming and combination of steel knife and steel wire

firstly, the steel knife and steel wire shall be cut and formed, that is, the steel knife and steel wire shall be cut and bent into corresponding length and shape according to the requirements. There are generally two methods to complete this process: manual single machine forming and automatic bending machine forming

the special equipment for manual single machine forming and processing mainly includes blade cutting machine, blade forming machine (machete machine), blade punching machine (bridge cutter), blade corner cutting machine, etc. Among them, the blade cutting machine is used for cutting the length of steel knife and steel wire; Blade forming machine (machete machine) is used for precise forming of arc or angle of steel knife and steel wire; The blade punching machine (bridge cutting machine) is used for punching the knife and line of the bridge part; The blade angle cutting machine is used to cut the angle of the steel knife at the intersection of knife and line (to ensure effective cutting). This processing method has slow speed, low production efficiency, can not process fine and complex graphics, poor repeatability, and has a great dependence on manual proficiency and technical level; However, the cost is relatively low, which is suitable for the processing of die-cutting plates with low quality and tight constr
uction period

automatic bending machine forming processing is a forming processing method of steel knife and steel wire gradually rising in recent years. It is generally used together with laser cutting machine to complete the production of die-cutting plate. The automatic CNC machete machine integrates cutting, machete, punching and corner cutting on one machine at one time, which can be said to be a qualitative leap in machete technology. The machete graphics used by the automatic machete are directly taken from the graphic design of the product. When working, just transfer the graphics and input the quantity to be formed, and the machine can complete the machete forming. During processing, the blade is sent to a special channel, which holds the blade tightly and extends it to describe it as flying and accurate. The machine can accept straight knife lines, but it is best to use coiled knife lines, which can improve the speed and save materials

after the steel knife and steel wire are formed and processed, it is required to put the cut base plate on the plate table during installation, with the back of a section of the processed knife wire facing down, align with the corresponding base plate position, hammer the upper edge with a special knife die hammer and insert it into the template. When hammering, you must use a special die hammer or wood hammer. The head of the die hammer is made of high elastic rubber. When hammering the edge of the knife line, you can ensure that the edge is not damaged. In recent years, automatic loading machine has also appeared, which has greatly improved the loading speed and quality

IV. open connection point

in the process of die-cutting plate making, open connection point is an essential process. The connection point is to open a small opening with a certain width at the edge of the die-cutting blade. In the process of die-cutting, the waste edge is still partially connected to the whole printing sheet after die-cutting, so as to facilitate the smooth paper feeding in the next step

the special equipment to be used for opening the connection point is the knife line drilling machine, that is, grinding with a grinding wheel instead of using a hammer and chisel to open the connection point, otherwise the knife line and lap foot will be damaged, and burrs are easy to occur in the connection part. The connecting point width has different specifications such as 0.3, 0.4, 0.5, 0.6, 0.8 and 1.0mm, and the commonly used specification is 0.4mm. The connection point is usually set at the hidden place that cannot be seen by the formed product. The smaller the connection point at the appearance after forming, the better, so as not to affect the appearance of the finished product. In addition, pay attention not to open the connection point at the bridge position (the die-cutting knife at the bridge position is suspended)

v. paste sponge adhesive strips

after the steel knife and steel wire are installed, in order to prevent the die-cutting knife from sticking to the paper during die cutting and indentation and make the paper run smoothly, elastic sponge adhesive strips shall be pasted on both sides of the knife line. Elastic sponge rubber strip plays a very important role in die-cutting, which directly affects the speed and quality of die-cutting. Generally speaking, the sponge rubber strip should be 3 ~ 5mm higher than the die-cutting knife. On different die-cutting machines, sponge rubber strips with different hardness, size and shape shall be selected according to the die-cutting speed, die-cutting live parts and relevant conditions. The specific selection of elastic sponge rubber strips can follow the following principles:

1. Hard sponge rubber strips are mostly placed in the gap at the lower edge of the die-cutting blade, while soft sponge rubber strips are mostly placed under the die-cutting blade or in the gap between the die-cutting blade and the die-cutting blade

2. If the distance between die shear forces is less than 8mm, sponge rubber strip with hardness of hs600 shall be selected

3. If the distance between die-cutting knives is greater than 10mm, sponge rubber strips with hardness of hs250 (corrugated board) or 350 (paperboard) should be selected

4. If the distance between the die cutter and the steel wire is less than 10mm, the arch sponge rubber strip with hardness of hs700 shall be selected; If it is greater than 10mm, the sponge rubber strip with hardness of hs350 shall be selected

5. Arch sponge rubber strip with hardness of hs700 is used at the punching position of die-cutting knife to protect the connecting point from being broken

6. The ideal distance between the die-cutting rubber strip and the knife line is 1 ~ 2mm

VI. trial cutting backing plate

after the die-cutting plate is processed, the die-cutting plate shall be installed on the die-cutting machine for trial cutting. If the trial cutting sample is locally normal and part of the sample is cut continuously, the backing plate shall be carried out locally, also known as “pressure supplement”. The backing plate is pasted on the bottom of the die-cutting plate with 0.05mm thick backing board to compensate the height of the die-cutting knife. When there are still some die cutting lines behind the local backing plate, the position backing plate shall be carried out. The position backing plate is to directly stick the narrow strip backing plate to the bottom of the die-cutting knife for tool line height compensation. This process also has a direct impact on the quality and speed of die-cutting, and has high requirements for the experience and technology of operators

through the above processes, the production of the die-cutting plate is basically completed, and the produced die-cutting plate can be produced on the machine. However, before the formal production, it must go through the processes of “making the indentation bottom root (to facilitate the formation of indentation, the common methods are manual sticking the bottom die and sticking the indentation die), trial die-cutting and customer sample signing”.

/article /572
the introduction here is more detailed. You can have a look. I hope it will be helpful to you.

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