A three-dimensional logo preparation process

Abstract

The present invention relates to a process for preparing a three-dimensional logo that is healthy, environmentally friendly, has good adhesion and high preparation efficiency, and comprises the following steps: spraying a logo pattern on the upper surface of a TPU film; applying glue on the lower surface of the TPU film and attaching a base film; cutting along the edge of the logo pattern of the product in step 2 by laser cutting to separate a single logo pattern on the TPU film to form a logo surface film layer, and cutting the TPU film and the base film together into equidistant sheet film plates; tearing off the logo surface film layer on the sheet film plate and attaching it to the bottom surface of a mold cavity of an injection mold; injection molding an injection molded body in the mold cavity of the injection mold, and fixing the logo surface film layer to the surface of the injection molded body; applying hot melt glue to the bottom surface of the injection molded body by a glue applying device and drying it, so that a layer of hot melt glue layer is attached to the bottom surface of the injection molded body; heating the hot melt glue layer on the injection molded body by a heating device to form a molten state, and then attaching it to the fabric.

Description

Technical Field

[0001] The invention relates to a three-dimensional marking preparation process. Background Art

[0002] Three-dimensional logos attached to fabrics (clothing) are used to display information about the manufacturer or product or to increase the aesthetics of the product. Since the nozzle and the medium surface are non-contact during printing, deformation due to heat and pressure will not occur. Therefore, it can also be printed on soft fabrics (clothing) that are easily deformed. Three-dimensional printing has been widely used in the textile industry, especially on fabrics (clothing). Traditional three-dimensional logos are mostly attached to fabrics (clothing) by printing. Specifically, a pattern is printed on the surface of the fabric, then dried, and then printed again on the pattern as needed, and dried again. However, the existing three-dimensional printing process has the following disadvantages:

[0003] 1) The combination of the three-dimensional logo and the fabric is weak, and the logo is prone to falling off during use;

[0004] 2) The printed pigments of the logo will penetrate into the inner layer of the fabric, affecting the softness and wearing comfort of the fabric. During wearing, the printed pigments may even come into direct contact with the human body, posing a certain risk of harm to the human body;

[0005] 3) During the washing process of the fabric, the printed pigment will also come into contact with water and detergent, and the printed surface will gradually become blurred or faded, affecting the aesthetic feeling of wearing and reducing the service life of the textile;

[0006] 4) During the preparation process, the three-dimensional logo needs to be attached after the fabric (clothing) is produced, which makes the production time of the finished product longer, and the preparation steps of the three-dimensional logo are cumbersome and the preparation efficiency is low. Summary of the Invention

[0007] Therefore, in order to solve the above problems, the present invention provides a three-dimensional marking preparation process which is healthy, environmentally friendly, has good adhesion and high preparation efficiency.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A three-dimensional marking preparation process comprises the following steps:

[0010] 1) Unwind the TPU film roll through the unwinding device and spray the logo pattern on the surface of the TPU film;

[0011] 2) Apply glue to the lower surface of the TPU film and attach the base film;

[0012] 3) cutting along the edge of the logo pattern of the product in step 2 by laser cutting to separate the individual logo patterns on the TPU film to form a logo surface film layer, and cutting the TPU film and the base film together into equidistant sheet film plates, each sheet film plate having multiple logo surface film layers;

[0013] 4) Tear off the logo surface film layer on the sheet film and stick it on the bottom surface of the mold cavity of the injection mold;

[0014] 5) Injection molding an injection molded body in a mold cavity of an injection mold, wherein the marking surface film layer is fixed to the surface of the injection molded body;

[0015] 6) applying hot melt adhesive to the bottom surface of the injection molded body through a glue applying device and drying the adhesive so that a layer of hot melt adhesive is attached to the bottom surface of the injection molded body;

[0016] 7) The hot melt adhesive layer on the injection molded body is heated by a heating device to form a molten state, and then attached to the fabric.

[0017] Furthermore, the heating temperature of the heating device in the above step 7 is 95° C. to 105° C., and the heating time is 70 to 120 seconds.

[0018] Furthermore, the bottom surface of the mold cavity is configured as a concave-convex surface structure.

[0019] Furthermore, the lower surface of the logo surface film layer in step 4 is attached to the bottom surface of the mold cavity, so that after the injection molding body is formed, the side sprayed with the logo pattern is distributed between the TPU film and the injection molding body.

[0020] Furthermore, the injection mold includes a mold body, which is defined as extending along the length direction of the mold body as a transverse direction and extending along its width direction as a longitudinal direction. The mold body includes an upper mold, a lower mold and an interlayer. A mounting groove is recessed on one longitudinal side of the upper surface of the lower mold, and at least one lower mold cavity is arranged side by side in the middle of the bottom surface of the mounting groove. The interlayer is provided at the mounting groove, and a feed port connected to each lower mold cavity is passed through the interlayer layer. A first flow channel connected to each feed port is provided on the upper surface of the interlayer, and a second flow channel connected to each first flow channel is provided on the other longitudinal side of the upper surface of the upper mold. An injection port connected to the second flow channel is passed through the upper mold.

[0021] Furthermore, first positioning portions are provided on both lateral sides of the bottom surface of the installation groove, and first positioning matching portions connected to the first positioning portions are provided on both lateral sides of the interlayer.

[0022] Furthermore, a convex edge is provided on the upper surface of the lower mold and on the edge close to the longitudinal side of the installation groove.

[0023] Furthermore, a second positioning portion is provided in the transverse middle portion of the convex edge, and a second positioning matching portion that matches the second positioning portion is provided on the lower surface of the upper mold.

[0024] Furthermore, each of the lower mold cavities includes a first groove portion, a second groove portion, and a third groove portion distributed longitudinally and separated from each other, and each of the feed ports includes a first through hole, a second through hole, and a third through hole respectively connected to the first groove portion, the second groove portion, and the third groove portion, and the first through hole, the second through hole, and the third through hole are connected to the same first flow channel.

[0025] Furthermore, the lower surface of the interlayer is provided with an upper mold cavity cooperating with the lower mold cavity.

[0026] By adopting the above-mentioned technical scheme, the beneficial effect of the present invention is as follows: the three-dimensional logo preparation process sprays the logo pattern on the TPU film, and then laser cuts it and compounds it with the base film and then cuts it into sheet templates, which is convenient for mass production and convenient for transportation to the injection mold, and then the logo surface film layer on the sheet template is attached to the bottom surface of the mold cavity of the injection mold and fixed to the injection molded body. The composite has good firmness and strong three-dimensional sense, which improves the aesthetics. At the same time, through such a design, the logo pattern can be generated in advance on a plane, and then compounded by the injection-molded injection molded body to form a three-dimensional structure, and then a hot melt adhesive layer is applied to the injection molded body, and finally the hot melt adhesive is heated to a molten state and attached to the fabric. Compared with the previous layer-by-layer spraying to form a three-dimensional logo, it can be prepared separately in the process and then compounded, and the separately prepared products are easy to store and transfer, which greatly improves production efficiency. Compared with paint spraying, it is environmentally friendly and has high adhesion strength to the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 1 is a schematic diagram of the top view of the injection mold in an embodiment of the present invention;

[0028] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0029] Figure 3 This is a schematic diagram of a top view of the structure in which the upper mold is omitted in an embodiment of the present invention;

[0030] Figure 4 1 is a schematic diagram of the top view of the lower mold in an embodiment of the present invention;

[0031] Figure 5 2 is a bottom view structural diagram of the interlayer in an embodiment of the present invention;

[0032] Figure 6 2 is a front view structural diagram of a glue applying device according to an embodiment of the present invention;

[0033] Figure 7is a schematic cross-sectional structural diagram of a clamping assembly in an embodiment of the present invention;

[0034] Figure 8 1 is a schematic diagram of the right side structure of the rotating shaft, roller body, pushing mechanism and drying mechanism in an embodiment of the present invention;

[0035] Figure 9 Schematic diagram of the top view of the vibration plate, the material guide track and the filling mechanism in an embodiment of the present invention;

[0036] Figure 10 2 is a front view structural diagram of the packing mechanism in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0038] The embodiments of the present invention are:

[0039] A three-dimensional marking preparation process comprises the following steps:

[0040] 1) unwinding a TPU film roll through an unwinding device, and spraying a logo pattern on the upper surface of the TPU film, wherein the TPU film is a transparent film layer;

[0041] 2) Apply glue to the lower surface of the TPU film and attach the base film;

[0042] 3) cutting along the edge of the logo pattern of the product in step 2 by laser cutting to separate the individual logo patterns on the TPU film to form a logo surface film layer, and cutting the TPU film and the base film together into equidistant sheet film plates, each sheet film plate having multiple logo surface film layers;

[0043] 4) tearing off the identification surface film layer on the sheet film plate and attaching it to the bottom surface of the mold cavity of the injection mold 1;

[0044] 5) Injection molding an injection molded body in the mold cavity of the injection mold 1, and fixing the marking surface film layer on the surface of the injection molded body;

[0045] 6) applying hot melt adhesive to the bottom surface of the injection molded body through the adhesive application device 2 and drying the adhesive so that a layer of hot melt adhesive is attached to the bottom surface of the injection molded body;

[0046] 7) The hot melt adhesive layer on the injection molded body is heated by a heating device to form a molten state, and then attached to the fabric.

[0047] This three-dimensional logo preparation process sprays the logo pattern on the TPU film, then laser cuts it and compounds it with the base film and then cuts it into sheet templates, which facilitates mass production and easy transportation to the injection mold, and then the logo surface film layer on the sheet template is attached to the bottom surface of the mold cavity of the injection mold and fixed to the injection molded body. The composite has good firmness and strong three-dimensional effect, which improves the aesthetics. At the same time, through such a design, the logo pattern can be generated in advance on a plane, and then compounded with the injection-molded injection molded body to form a three-dimensional structure, and then a hot melt adhesive layer is applied to the injection molded body. Finally, the hot melt adhesive is heated to a molten state and attached to the fabric. Compared with the previous layer-by-layer spraying to form a three-dimensional logo, it can be prepared separately in the process and then compounded, and the separately prepared products are easy to store and transfer, which greatly improves production efficiency. In addition, compared with paint spraying, it is environmentally friendly and has high adhesion strength to the fabric.

[0048] In addition, the heating temperature of the heating device in the above step 7 is 95°C to 105°C, preferably 102°C, and the heating time is 70 to 120 seconds, preferably 80 seconds, so that the hot melt adhesive is in a better melting state. At such a temperature, when attached to the fabric, the hot melt adhesive can penetrate into the gaps in the fabric and wrap around the yarn surface on the fabric, thereby improving the adhesion strength to the fabric.

[0049] At the same time, the bottom surface of the mold cavity is set to a concave-convex surface structure, which increases the contact area and fixing strength between the surface identification film layer and the injection molded body, and can improve the three-dimensional effect of the molded logo, thereby improving the aesthetics.

[0050] Furthermore, the lower surface of the identification surface film layer in the above step 4 is attached to the bottom surface of the mold cavity, so that after the injection molding body is formed, the side sprayed with the identification pattern is distributed between the TPU film and the injection molding body, which can not only be better fixed in the mold cavity, but also during the injection molding process, the molten material heats the coating, so that the coating is separated from the TPU film and penetrates into the material and is fixed, avoiding the problem of discoloration. Moreover, under the transparent TPU film, the identification color can be better displayed to ensure the quality of the identification.

[0051] refer to Figures 1 to 5As shown, in this embodiment, the injection mold 1 includes a mold body, which is defined as extending along the length direction of the mold body as a transverse direction and extending along its width direction as a longitudinal direction. The mold body includes an upper mold 101, a lower mold 102 and an interlayer 103. A mounting groove 104 is recessed on one longitudinal side of the upper surface of the lower mold 102, and two lower mold cavities 105 are arranged side by side in the middle of the bottom surface of the mounting groove 104. The interlayer 103 is arranged at the mounting groove 104, and a feed port 106 is passed through the interlayer 103, which is respectively connected to each lower mold cavity 105. A first flow channel 107 connected to each feed port 106 is provided on the upper surface of the interlayer 103, and a second flow channel 108 connected to each first flow channel 107 is provided on the other longitudinal side of the upper surface of the upper mold 101. An injection port 109 connected to the second flow channel 108 is passed through the upper mold 101.

[0052] The upper surface of the lower mold 102 is provided with a mounting groove 104 for arranging the interlayer 103, and the interlayer 103 cooperates with the lower mold cavity of the lower mold 102 to form a mold cavity. The upper mold 101 cooperates with the lower mold 102 and the interlayer 103 to form a first flow channel 107, a second flow channel 108 and a feed port 109. When in use, the interlayer 103 is placed in the mounting groove 104, and the upper mold 101 is closed with the lower mold 102, and injection is performed through the injection port 109. The material flows through the injection port 109 in sequence through the first flow channel 107. , the second flow channel 108, the feed port 106, and enters the lower mold cavity 105 for injection molding. The mold body 101 has a simple structure and low processing cost, and the interlayer is fixed by the clamping of the upper mold 101 and the lower mold 102, which improves the stability of injection molding and has good equipment operation reliability. After molding, the mold is opened by the upper mold 101 and the lower mold 102. Since the materials on the feed port 106 and the first flow channel 107 are molded as one with the material in the lower mold cavity 105, the interlayer 103 is taken out and demoulded, and then the material at the feed port 106 is cut off, and its production efficiency is high.

[0053] In addition, first positioning parts 111 are provided on both lateral sides of the bottom surface of the installation groove 4, and the first positioning parts 111 are positioning columns. First positioning matching parts 112 connected to the first positioning parts 111 are provided on both lateral sides of the interlayer 103, and the first positioning matching parts 112 are positioning holes. A convex edge 110 is provided on the upper surface of the lower mold 102 and close to the edge of the longitudinal side of the installation groove 104. A second positioning part 113 is provided in the lateral middle part of the convex edge 110, and the second positioning part 113 is a positioning groove. The lower surface of the upper mold 1 is provided with a second positioning matching part (not shown in the figure) matching with the second positioning part 113, and the second positioning matching part is a positioning protrusion, so that the positioning of the interlayer 103, the upper mold 101 and the lower mold 102 are accurate and precise, thereby improving the molding quality of the molded product.

[0054] Specifically, each of the lower mold cavities 105 includes a first groove portion 151, a second groove portion 152 and a third groove portion 153 distributed in the longitudinal direction and separated from each other, and each of the feed ports 106 includes a first through hole 161, a second through hole 162 and a third through hole 163 respectively connected to the first groove portion 151, the second groove portion 152 and the third groove portion 153, and the first through hole 161, the second through hole 162 and the third through hole 163 are connected to the same first flow channel 107, and the lower surface of the interlayer 103 is provided with an upper mold cavity 120 that cooperates with the lower mold cavity 105, which can form an injection molded body with a larger thickness, and through the setting of the lower mold cavity 105 and the feed port 106, an injection molded body composed of separated parts can be overmolded, so that the molding coordination of each part is high. At the same time, an injection molded body composed of a single part can also be molded at one time, thereby improving the applicability of the mold.

[0055] refer to Figures 6 to 10 As shown, in this embodiment, the glue applying device 2 includes a frame, a control system arranged on the bracket, a vibration plate 21, a material guide track 22, a filling mechanism 23, a rotating shaft 24, four rollers 25, two glue storage tanks 26, a heating rod 27, two glue rollers 28, two drying devices 29, a lever mechanism 30, a pushing mechanism 31 and a driving motor. The rotating shaft 24 is rotatably arranged on the frame through a bearing, and the axis direction of the rotating shaft 24 is defined as the first drying area 241, the first glue applying area 242, the loading area 243, the second glue applying area 244, and the second drying area 245. The four rollers 25 are slidably mounted on the rotating shaft 24 and rotate with the rotating shaft 24. The lever mechanism 30 is arranged on the circumferential side of the rotating shaft 24 for driving each of the rollers 25 to reciprocate along the axis direction of the rotating shaft 24. Each of the rollers 25 is provided with a plurality of storage tanks at intervals along its circumferential direction. The material trough 32 is provided with a clamping assembly 33 for clamping the injection molded body on its circumference. The driving motor is connected to the rotating shaft 24. The material guide track 22 is provided at the output end of the vibration disk 21. The width of the material guide track 22 is 2 mm larger than the width of the injection molded body. The filling mechanism 23 is provided at the output end of the material guide track 22. The filling mechanism 23 is distributed in the loading area 243 and is located on the lower side of the roller body 25. The two glue storage troughs 26 and the glue roller 28 are respectively distributed in the first glue application area 242 and the second glue application area 244, and are distributed on the lower side of the roller body 25. The heating rod 27 is provided in the glue storage trough 26. A scraper plate (not shown in the figure) is provided on the circumference of each glue application roller 28. The two drying devices 29 and the pushing device 31 are respectively provided in the first drying area 241 and the second drying area 245, and the pushing device 31 is provided at the output end of the drying device 29.

[0056] The injection molded body is placed on the vibration plate 21. The vibration of the vibration plate 21 adjusts the posture of the injection body and discharges it into the guide track 22 in sequence. It slides along the guide track 22 to the filling mechanism 23. It is filled into the storage groove 32 on the first roller body 25 of the rotating shaft 24 in sequence through the filling mechanism 23 and is clamped and fixed by the clamping assembly 33. When the storage groove 32 on the first roller body 25 is filled, the roller body 25 is pushed to the left by the lever mechanism 30 to enter the first gluing area 242 and rotate synchronously. The bottom surface of the injection body is realized by the cooperation of the gluing roller 28 and the roller body 25. Gluing, at this time, the second roller body 25 enters the loading area 243 for filling, and then the first roller body 25 is pushed to the left by the lever mechanism 30 into the first drying area 241 for drying, and then the injection molded body is pushed out of the storage tank 32 by the pushing device 31. At this time, the second roller body 25 enters the first gluing area 242 for gluing, and then the second roller body 25 is further pushed into the second drying area 243 for drying. At this time, the third roller body 25 enters the loading area 243, and then the lever mechanism 30 synchronously pushes the roller body 25 to the right in turn into the second gluing area 244 and the second drying area 245 to complete one round of gluing.

[0057] Specifically, the filling mechanism 23 includes a filling motor 231, a crank-connecting rod mechanism 232 provided at the output end of the filling motor 231, and a filling platform 233 provided at the output end of the crank-connecting rod mechanism 232. The filling platform 233 is provided with a filling station 234 that cooperates with the guide track 22. A guide mechanism 235 is provided between the filling platform 233 and the frame. The guide mechanism 235 includes a guide rod vertically provided on the lower surface of the filling platform and a guide sleeve provided on the frame. The filling motor 231 drives the filling platform 233 to reciprocate up and down through the crank-connecting rod mechanism 232, so that the injection molded body entering the filling station 234 through the guide track 22 enters the storage tank 32 of the roller body 25 to realize filling.

[0058] The lever mechanism 30 includes a left baffle 301, a right baffle 302, a connecting rod 303, and a driving cylinder 304 that are slidably arranged on the rotating shaft 24. The left baffle 301 and the right baffle 302 are respectively distributed on both sides of the axial direction of the roller body 25. The connecting rod 303 connects the left baffle 301 and the right baffle 302. The driving cylinder 304 is connected to the connecting rod 303. The connecting rod 303 is driven to move by the driving cylinder 304, thereby driving the roller body 25 to move along the axial direction of the rotating shaft 24.

[0059] The clamping assembly 33 includes a clamping frame 331 embedded in the material storage trough 32, a limiting plate 332 provided at the bottom end of the clamping frame 331, an arc-shaped clamping block 333 provided on the side of the clamping frame 331, and a spring 334 provided between the clamping block 333 and the clamping frame 331. The clamping block 333 has an opening 335, and the limiting plate 332 slides along the radial direction of the rotating shaft 24. The pushing mechanism 31 includes a mounting seat 311 sleeved on the rotating shaft 24 and a pushing cylinder 312 provided on the mounting seat 311. The limiting plate 332 is pushed by the driving cylinder 312 to realize the detachment of the injection molded body clamped on the arc-shaped clamping block 333.

[0060] The drying device 29 described above is a warm air drying device, which is a prior art and will not be described in detail here.

[0061] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A three-dimensional marking preparation process, characterized by: The following steps are involved: 1) Unwind the TPU film roll through the unwinding device and spray the logo pattern on the surface of the TPU film; 2) Apply glue to the lower surface of the TPU film and attach the base film; 3) Laser cutting along the edges of the logo pattern on the product in step 2 separates the individual logo patterns on the TPU film to form a logo surface film layer, and cutting the TPU film and the base film together into equidistant sheet films, each sheet film having multiple logo surface film layers; 4) Tear off the logo surface film layer on the sheet film and stick it on the bottom surface of the mold cavity of the injection mold; 5) Injection molding an injection molded body in a mold cavity, wherein the marking surface film layer is fixed on the surface of the injection molded body; 6) Apply hot melt adhesive to the bottom surface of the injection molded body through the adhesive application device and dry it, so that a layer of hot melt adhesive is attached to the bottom surface of the injection molded body; The glue applying device includes a frame, a control system arranged on the frame, a vibration plate, a material guide track, a filling mechanism, a rotating shaft, four rollers, two glue storage tanks, a heating rod, two glue rollers, two drying devices, a lever mechanism, a pushing mechanism and a driving motor. The rotating shaft is rotatably arranged on the frame through a bearing, and the axis direction of the rotating shaft is defined as the first drying area, the first glue applying area, the loading area, the second glue applying area, and the second drying area. The four rollers are slidably mounted on the rotating shaft and rotate with the rotating shaft. The lever mechanism is arranged on the circumferential side of the rotating shaft for moving each of the rollers back and forth along the axis direction of the rotating shaft. Each of the rollers is provided with a plurality of storage tanks at intervals along its circumferential direction. A material trough, a clamping assembly for clamping the injection molded body is provided on the circumference of the material storage trough, the drive motor is connected to the rotating shaft, the material guide track is provided at the output end of the vibration disk, the width of the material guide track is 2 mm larger than the width of the injection molded body, the filler mechanism is provided at the output end of the material guide track, the filler mechanism is distributed in the feeding area, and is located on the lower side of the roller body, the two glue storage troughs and the glue rollers are respectively distributed in the first glue application area and the second glue application area, and are distributed on the lower side of the roller body, the heating rod is provided in the glue storage trough, and a scraper is provided on the circumference of each glue application roller, the two drying devices and the pushing mechanism are respectively provided in the first drying area and the second drying area, and the pushing mechanism is provided at the output end of the drying device; 7) The hot melt adhesive layer on the injection molded body is heated by a heating device to form a molten state, and then attached to the fabric.

2. The three-dimensional marking preparation process according to claim 1, characterized in that: In the above step 7, the heating temperature of the heating device is 95° C. to 105° C., and the heating time is 70 to 120 seconds.

3. The three-dimensional marking preparation process according to claim 1, characterized in that: The bottom surface of the mold cavity is configured as a concave-convex surface structure.

4. The three-dimensional marking preparation process according to claim 1, characterized in that: The lower surface of the logo surface film layer in step 4 is attached to the bottom surface of the mold cavity, so that after the injection molding body is formed, the side sprayed with the logo pattern is distributed between the TPU film and the injection molding body.

5. The process for preparing a three-dimensional mark according to any one of claims 1 to 4, characterized in that: The injection mold includes a mold body, which is defined as extending along the length direction of the mold body as a transverse direction and extending along its width direction as a longitudinal direction. The mold body includes an upper mold, a lower mold and an interlayer. A mounting groove is recessed on one longitudinal side of the upper surface of the lower mold, and at least one lower mold cavity is arranged side by side in the middle of the bottom surface of the mounting groove. The interlayer is arranged at the mounting groove, and a feed port connected to each lower mold cavity is passed through the interlayer layer. A first flow channel connected to each feed port is provided on the upper surface of the interlayer, and a second flow channel connected to each first flow channel is provided on the other longitudinal side of the upper surface of the upper mold. An injection port connected to the second flow channel is passed through the upper mold.

6. The three-dimensional marking preparation process according to claim 5, characterized in that: First positioning portions are provided on both lateral sides of the bottom surface of the installation groove, and first positioning matching portions connected to the first positioning portions are provided on both lateral sides of the interlayer.

7. The three-dimensional marking preparation process according to claim 6, characterized in that: A convex edge is provided on the upper surface of the lower mold and close to the edge of one longitudinal side of the installation groove.

8. The three-dimensional marking preparation process according to claim 7, characterized in that: A second positioning portion is provided in the transverse middle portion of the convex edge, and a second positioning matching portion matching with the second positioning portion is provided on the lower surface of the upper mold.

9. The three-dimensional marking preparation process according to claim 8, characterized in that: Each of the lower mold cavities includes a first groove portion, a second groove portion, and a third groove portion distributed longitudinally and separated from each other, and each of the feed ports includes a first through hole, a second through hole, and a third through hole respectively connected to the first groove portion, the second groove portion, and the third groove portion, and the first through hole, the second through hole, and the third through hole are connected to the same first flow channel.

10. The three-dimensional marking preparation process according to claim 9, characterized in that: An upper mold cavity matching the lower mold cavity is provided on the lower surface of the interlayer.

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