Four-color printing type vamp and manufacturing method thereof

Abstract

The invention belongs to the technical field of printing, and particularly relates to a four-color printing type vamp and a manufacturing method thereof.The four-color printing type vamp comprises a supporting frame, ball grooves are formed in the upper end of the supporting frame in an array mode, balls are arranged on the inner wall of each ball groove, a rotating disc is rotationally connected to the upper end of the supporting frame, and limiting columns are arranged at the upper end of the rotating disc in an array mode. According to the manufacturing method, the printing mechanism is arranged, a double-head air cylinder drives a scraper to conduct bidirectional scraping printing, the angle of the scraper is adjusted in cooperation with an electric telescopic rod and a rotating component, and the printing requirements of different patterns can be met; the inverted air cylinder on the inverted cap drives the printing plate to turn over to adjust the distance, the printing plate can be flexibly matched with vamps of different thicknesses, the application range of the device is further widened, and the universality and stability of the printing technology are improved.

Description

Technical Field

[0001] This invention relates to the field of printing technology, and in particular to a four-color printed shoe upper and its manufacturing method. Background Technology

[0002] With the diversification of consumer demand for footwear products, the decorative and personalized aspects of shoe uppers have become one of the core elements of market competition. Four-color printing technology, due to its ability to achieve rich color combinations and complex patterns, is widely used in the shoe upper manufacturing industry. Currently, most mainstream four-color printing shoe upper production equipment in the industry is based on improvements to traditional printing machinery. Although it can meet basic printing needs, it still has significant technical shortcomings in terms of automation, printing accuracy, and material compatibility, which restricts the improvement of production efficiency and product quality.

[0003] Existing feeding mechanisms are mainly divided into two categories. One type uses a rigid pusher plate to separate and stack shoe uppers, which can easily cause scratches and indentations to flexible shoe upper materials such as leather and mesh, affecting the appearance of the shoe upper. The other type uses vacuum adsorption separation, but when shoe uppers are stacked, static electricity or material adhesion can easily cause adsorption failure, resulting in multiple pieces being fed at the same time or no feeding at all. In addition, the feeding and positioning processes are independent of each other, requiring manual assistance to calibrate the position of the shoe uppers, resulting in low automation and a feeding efficiency of only 20-30 pieces / hour, which is difficult to match the pace of mass production. In particular, the squeegee angle of existing printing mechanisms is mostly fixed, which cannot be adjusted according to different pattern types such as lines and large areas of color blocks, resulting in some patterns being missed or printed. On the other hand, the printing heads are mostly rigid structures, which are difficult to adapt to the natural slight curvature of the shoe upper surface, resulting in poor fit and easy to create printing dead corners. At the same time, ink delivery mostly uses open or simple pipeline delivery, which lacks precise control and is prone to local ink accumulation or insufficient supply, resulting in defects such as uneven color and blurred pattern boundaries.

[0004] To address the aforementioned issues, a four-color printed shoe upper and its manufacturing method are proposed. Summary of the Invention

[0005] Based on the existing technical problems of poor adaptability of automatic feeding and insufficient stability of printing quality, this invention proposes a four-color printed shoe upper and its manufacturing method.

[0006] The present invention proposes a four-color printed shoe upper, comprising a shoe upper, the shoe upper being composed of a flexible substrate, a UV-cured marking layer, and a texture layer. The flexible substrate is made of polyester fiber or mesh fabric. The UV-cured marking layer is printed on the upper surface of the flexible substrate for positioning the printing area. The texture layer uses four-color water-based ink.

[0007] Preferably, the UV-curable marking layer uses low-viscosity UV-curable ink to form a composite connection structure with the surface of the flexible substrate through inkjet printing process, which combines physical adsorption and chemical bonding. After UV curing, the marking layer thickness is 8-12 micrometers, the peel strength with the flexible substrate is ≥1.5N / cm, and there is no ink overflow or peeling at the edge of the marking layer.

[0008] Preferably, the texture layer is applied to the surface of the UV-curable marking layer and the flexible substrate area defined by the marking layer using a screen printing process. Four-color water-based inks are applied to the surface of the UV-curable marking layer in a penetrating manner. The hydroxyl groups contained in the inks undergo a cross-linking reaction with the active functional groups on the surface of the UV-curable marking layer, thereby achieving a stable connection between the texture layer and the UV-curable marking layer.

[0009] Preferably, the four-color water-based ink is composed of cyan, magenta, yellow, and black environmentally friendly water-based resin inks, with 0.5-1.2% of a flexible curing agent added. The total thickness of the texture layer is 30-50 micrometers, and the bonding gap between the texture layer and the UV-cured marking layer is ≤5 micrometers.

[0010] Preferably, a method for manufacturing a four-color printed shoe upper includes the following steps:

[0011] Step 1: Cut the flexible base to fit the shoe shape. Clean the surface of the cut flexible base to remove dust, fiber debris and other impurities. Then put it into a dryer, set the drying temperature to 50 degrees Celsius and the drying time to 10-15 minutes to ensure that the surface of the flexible base is dry and free of moisture.

[0012] Step 2: Load the preset positioning pattern into the UV inkjet printer. Set the printer nozzle to a nozzle diameter of 0.2 mm to ensure positioning accuracy. Use UV-curable ink to print UV-curable marking layers on the surface of the flexible substrate in layers. The thickness of each layer is controlled at 8-12 micrometers. Set the printing speed to 450-550 mm per second. Keep the printing environment temperature at 38-42 degrees Celsius. After printing, use a UV curing device for immediate curing. The curing time is 30-60 seconds.

[0013] Step 3: Based on the four-color screens corresponding to the design pattern, the four-color water-based inks are printed layer by layer through a screen printing machine. The screen printing time for each color is set to 3-6 minutes, and the thickness of the ink layer printed in one pass is 15-25 micrometers. During the printing process, the ambient humidity is controlled at 40%-60% to ensure that the ink layers of adjacent colors are connected naturally and the colors are superimposed evenly.

[0014] Step 4: After the four-color texture layer is printed, the shoe upper is sent into the curing oven for heating and curing. The curing temperature is set to 75-85 degrees Celsius and the curing time is 6-10 minutes to allow the four-color water-based inks to fully adhere and form.

[0015] Step 5: Clean the surface of the cured shoe upper to remove excess ink, spilled ink and residual impurities from the edges. Then, conduct appearance inspection, size verification and adhesion test to ensure that the UV-cured marking layer is accurately positioned, the texture layer has full and accurate color, and each layer is firmly bonded without falling off.

[0016] Preferably, in step three, the screen printing process includes a support frame with a supporting function. The upper end of the support frame is arrayed with ball grooves, and each ball groove has a ball on its inner wall. The upper end of the support frame is rotatably connected to a rotating disk, and the upper end of the rotating disk is arrayed with limit posts. The upper end of the support frame is arrayed with a printing mechanism, and a feeding mechanism is provided on one side of the support frame. An inverted cap is provided at the center of the support frame, and a servo motor is installed inside the inverted cap. The output shaft of the servo motor is rotatably connected to the side of the inverted cap, and a helical gear is fixedly connected to the output shaft of the servo motor.

[0017] The upper surface of the rotating disk near the center is provided with an array of toothed surfaces that are adapted to the surface of the helical gear, and the surface of the helical gear meshes with the toothed surfaces of the rotating disk.

[0018] The array of limiting posts is adapted to the outer periphery of the shoe upper;

[0019] The outer surface of the inverted cap is arrayed with arc-shaped grooves. Each arc-shaped groove has an inverted cylinder on its inner wall. The piston rod of each cylinder is rotatably connected to a printing plate. One end of the printing plate is rotatably connected to the inner wall of the arc-shaped groove. The printing mechanism includes a support rod fixedly connected to the side of the support frame. A support plate is fixedly connected to the upper end of the support rod. A double-headed cylinder is fixedly connected to the upper end of the support plate. Feed pipes are symmetrically arranged on the housing of the double-headed cylinder. A pump body is fixedly connected to one end of the feed pipe. The lower end of the pump body is fixedly connected to the upper surface of the double-headed cylinder. A connecting plate is fixedly connected between the two piston rods of the double-headed cylinder. An electric telescopic rod is provided at the upper end of the connecting plate. A scraper is rotatably connected to one end of the piston rod of the double-headed cylinder.

[0020] Preferably, the scraper has an internal array of oil outlet holes, one end of the feed pipe is fixedly connected to the inner wall of the oil outlet holes, one end of the electric telescopic rod is provided with a rotating component, the connecting rod of the rotating component is rotatably connected to one end of the telescopic rod of the electric telescopic rod, and the lower end of the rotating component is fixedly connected to the upper end of the scraper.

[0021] Preferably, the feeding mechanism includes a motor, the output shaft of the motor is fixedly connected to a connecting column, the side of the connecting column is provided with a placement frame through an array of connecting blocks, the shoe upper array is inside the placement frame, a pusher motor is inverted and embedded at an axially symmetrical position of the placement frame, the output shaft of the pusher motor is fixedly connected to a rotating rod, the outer surface of the rotating rod is rotatably connected to the body of the placement frame through a bearing, and a partition plate is fixedly connected to the lower end of the rotating rod.

[0022] Preferably, the separator has an arc-shaped flexible structure on both sides, and the thickness of the edge of the separator in the longitudinal direction is one-tenth of the thickness of the rear end of the shoe upper.

[0023] Preferably, the lower end of the scraper is provided with a flexible printing head made of wear-resistant silicone.

[0024] The beneficial effects of this invention are as follows:

[0025] 1. By setting up a feeding mechanism, a motor drives the connecting column and the placement frame to rotate and feed the material. With the addition of the flexible arc-shaped separators on both sides, it can smoothly insert into the stacked shoe uppers to achieve single-sheet separation. This avoids scratching and damage to the shoe upper material caused by hard separation and ensures the smoothness of the separation action. At the same time, the separated shoe uppers fall accurately into the limiting column area of ​​the rotating disk under the action of gravity. The soft wrapping design of the limiting column further prevents the shoe uppers from shifting, realizing the integration of feeding and positioning. The feeding efficiency is effectively improved compared with traditional manual feeding, meeting the needs of mass production.

[0026] 2. By setting up a printing mechanism, a double-headed cylinder drives the squeegee to print in both directions. The angle of the squeegee can be adjusted by an electric telescopic rod and rotating parts to adapt to the printing needs of different patterns. The oil outlet holes arrayed inside the squeegee, together with the feed pipe and pump body, form a precise ink delivery channel to ensure that the ink penetrates evenly to the surface of the flexible printing head. The flexible printing head made of wear-resistant silicone material has good elasticity and conformity, which can adapt to the slightly curved surface of the shoe upper and avoid missing or false printing. In addition, the inverted cylinder on the cap drives the printing plate to flip and adjust the spacing, which can flexibly adapt to shoe uppers of different thicknesses, further expanding the applicability of the equipment and improving the versatility and stability of the printing process. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a four-color printed shoe upper proposed in this invention;

[0028] Figure 2 This is a perspective view of a four-color printing shoe upper printing device proposed in this invention;

[0029] Figure 3 This is a servo motor position diagram for a four-color printed shoe upper proposed in this invention;

[0030] Figure 4 This is a perspective view of a support frame for a four-color printed shoe upper proposed in this invention;

[0031] Figure 5 This is a perspective view of the printing mechanism for a four-color printed shoe upper proposed in this invention;

[0032] Figure 6 This invention proposes a four-color printed shoe upper. Figure 4 Enlarged view of point A in the middle;

[0033] Figure 7 This is a three-dimensional view of a scraper for a four-color printed shoe upper proposed in this invention;

[0034] Figure 8 This is a perspective view of a feeding mechanism for a four-color printed shoe upper proposed in this invention;

[0035] Figure 9 This is a cross-sectional view of the placement frame of a four-color printed shoe upper proposed in this invention;

[0036] Figure 10 This is a three-dimensional view of the separator sheet for a four-color printed shoe upper proposed in this invention.

[0037] In the diagram: 1. Support frame; 10. Ball bearing; 2. Rotating disk; 20. Limiting post; 3. Printing mechanism; 31. Support rod; 32. Support plate; 33. Double-headed cylinder; 34. Feed pipe; 35. Connecting plate; 36. Electric telescopic rod; 37. Scraper; 38. Rotating component; 4. Feeding mechanism; 41. Motor; 42. Connecting post; 43. Placement frame; 44. Pushing motor; 45. Rotating rod; 46. Separator; 5. Inverted cap; 6. Servo motor; 7. Helical gear; 8. Shoe upper; 80. Flexible substrate; 81. UV-cured marking layer; 82. Texture layer; 9. Cylinder; 91. Printing plate. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] Reference Figure 1 A four-color printed shoe upper includes an upper 8, which consists of a flexible substrate 80, a UV-cured marking layer 81, and a texture layer 82. The flexible substrate 80 is made of polyester fiber or mesh. The UV-cured marking layer 81 is printed on the upper surface of the flexible substrate 80 to locate the printing area. The texture layer 82 uses four-color water-based ink.

[0040] The UV-curable marking layer 81 uses low-viscosity UV-curable ink to form a composite connection structure with the surface of the flexible substrate 80 through inkjet printing process, which combines physical adsorption and chemical bonding. After UV curing, the marking layer has a thickness of 8-12 micrometers and a peel strength with the flexible substrate 80 of ≥1.5N / cm. There is no ink overflow or peeling at the edge of the marking layer.

[0041] The texture layer 82 is covered on the surface of the UV-curable marking layer 81 and the area of ​​the flexible substrate 80 defined by the marking layer through a screen printing process. The four-color water-based ink forms a penetrating bond with the surface of the UV-curable marking layer 81. The hydroxyl groups contained in the ink undergo a cross-linking reaction with the active functional groups on the surface of the UV-curable marking layer 80, thereby achieving a stable connection between the texture layer 82 and the UV-curable marking layer 81.

[0042] The four-color water-based ink is composed of cyan, magenta, yellow, and black environmentally friendly water-based resin inks, with 0.5-1.2% of flexible curing agent added. The total thickness of the texture layer 82 is 30-50 micrometers, and the bonding gap between it and the UV-cured marking layer 81 is ≤5 micrometers.

[0043] In this embodiment, refer to Figures 2-10 As shown, a method for manufacturing a four-color printed shoe upper includes the following specific steps:

[0044] Step 1: Cut the flexible substrate 80 to fit the shoe shape. Clean the surface of the cut flexible substrate 80 to remove dust, fiber debris and other impurities. Then put it into a dryer, set the drying temperature to 50 degrees Celsius and the drying time to 10-15 minutes to ensure that the surface of the flexible substrate 80 is dry and free of moisture.

[0045] Step 2: Load the preset positioning pattern into the UV inkjet printer. Set the printer nozzle to a nozzle diameter of 0.2 mm to ensure positioning accuracy. Use UV-curable ink to print UV-curable marking layers 81 on the surface of the flexible substrate 80 in layers. The thickness of each layer is controlled at 8-12 micrometers. Set the printing speed to 450-550 mm per second. Keep the printing environment temperature at 38-42 degrees Celsius. After printing, use a UV curing device for immediate curing. The curing time is 30-60 seconds.

[0046] Step 3: Based on the four-color screens corresponding to the design pattern, the four-color water-based inks are printed layer by layer through a screen printing machine. The screen printing time for each color is set to 3-6 minutes, and the thickness of the ink layer printed in one pass is 15-25 micrometers. During the printing process, the ambient humidity is controlled at 40%-60% to ensure that the ink layers of adjacent colors are connected naturally and the colors are superimposed evenly.

[0047] Step 4: After the four-color texture layer 82 is printed, the shoe upper is sent into the curing oven for heating and curing. The curing temperature is set to 75-85 degrees Celsius and the curing time is 6-10 minutes to allow the four-color water-based inks to fully adhere and form.

[0048] Step 5: Clean the surface of the cured shoe upper 8 to remove excess ink, spilled ink and residual impurities from the edges. Then, conduct appearance quality inspection, size verification and adhesion test to ensure that the UV-cured marking layer 81 is accurately positioned, the texture layer 82 has full color without deviation, and each layer is firmly bonded without falling off.

[0049] In step three, the screen printing process includes a support frame 1 with a support function. The upper end of the support frame 1 is arrayed with ball grooves, and each ball groove has a ball 10 on its inner wall. The upper end of the support frame 1 is rotatably connected to a rotating disk 2. The upper end of the rotating disk 2 is arrayed with limit posts 20. The upper end of the support frame 1 is arrayed with a printing mechanism 3. A feeding mechanism 4 is set on one side of the support frame 1. An inverted cap 5 is set at the center of the support frame 1. A servo motor 6 is set inside the inverted cap 5. The output shaft of the servo motor 6 is rotatably connected to the side of the inverted cap 5. A helical gear 7 is fixedly connected to the output shaft of the servo motor 6.

[0050] In this embodiment, the upper surface of the rotating disk 2 near the center is provided with toothed surfaces that are adapted to the surface of the helical gear 7, and the surface of the helical gear 7 meshes with the toothed surfaces of the rotating disk 2.

[0051] Specifically, the toothed surfaces are evenly arrayed along the annular area on the upper surface of the rotating disk 2, and the tooth pitch matches the tooth pitch of the helical gear 7. After the servo motor 6 is started, the torque of the helical gear 7 is efficiently transmitted to the rotating disk 2 through the tooth surface transmission. Meanwhile, the balls 10 in the ball groove at the upper end of the support frame 1 roll and cooperate with the annular rolling groove on the lower surface of the rotating disk 2, converting sliding friction into rolling friction, ensuring that the rotating disk 2 meets the precise alignment requirements of four-color printing.

[0052] In this embodiment, the upper surface of the rotating disk 2 is provided with an array of shoe uppers 8, and the array of limiting posts 20 are adapted to the periphery of the shoe uppers 8.

[0053] Specifically, the limiting post 20 adopts a structure in which a hard plastic core is wrapped with soft silicone and is evenly distributed along the outer contour of the shoe upper 8. The height of adjacent limiting posts 20 is smaller than the thickness of the shoe upper 8, which can limit the horizontal displacement of the shoe upper 8 without obscuring the printed area of ​​the shoe upper 8. At the same time, the soft silicone surface can avoid scratching the leather or mesh material of the shoe upper 8.

[0054] In this embodiment, the outer surface of the inverted cap 5 is arrayed with arc-shaped grooves, and a cylinder 9 is inverted on the inner wall of each arc-shaped groove. The piston rod of each cylinder 9 is rotatably connected to a printing plate 91, and one end of the printing plate 91 is rotatably connected to the inner wall of the arc-shaped groove.

[0055] Specifically, cylinder 9 is a small and compact cylinder. After being installed upside down, the piston rod faces downward. The connection between cylinder 9 and printing plate 91 is achieved by a hinge structure to rotate 120°, flipping from the initial state to a horizontal state parallel to the shoe upper 8. The flipping process is smooth and without jamming, ensuring the consistent fit between printing plate 91 and shoe upper 8.

[0056] In this embodiment, the printing mechanism 3 includes a support rod 31 fixedly connected to the side of the support frame 1. A support plate 32 is fixedly connected to the upper end of the support rod 31. A double-headed cylinder 33 is fixedly connected to the upper end of the support plate 32. Feed pipes 34 are symmetrically arranged on the housing of the double-headed cylinder 33. A pump body is fixedly connected to one end of the feed pipe 34. The lower end of the pump body is fixedly connected to the upper surface of the double-headed cylinder 33. A connecting plate 35 is fixedly connected between the two piston rods of the double-headed cylinder 33. An electric telescopic rod 36 is provided at the upper end of the connecting plate 35. A scraper 37 is rotatably connected to one end of the piston rod of the double-headed cylinder 33.

[0057] Specifically, the support rod 31 is made of stainless steel, and its length is set according to the installation height of the printing mechanism 3; the support plate 32 is made of aluminum alloy plate with a thickness of 10-15mm, and the surface is milled to ensure the flatness of the installation of the double-headed cylinder 33; the piston rods of the double-headed cylinder 33 maintain synchronization, and drive the scraper 37 through the connecting plate 35 to achieve bidirectional uniform speed scraping; the pump body is a micro quantitative pump, and the ink delivery volume per hour can be adjusted within the range of 1-5L to avoid excessive ink waste or insufficient supply.

[0058] In this embodiment, the scraper 37 has an internal array of oil outlet holes. The inner wall of one end of the feed pipe 34 is fixedly connected to the inner wall of the oil outlet hole. One end of the electric telescopic rod 36 is provided with a rotating component 38. The connecting rod of the rotating component 38 is rotatably connected to one end of the telescopic rod of the electric telescopic rod 36. The lower end of the rotating component 38 is fixedly connected to the upper end of the scraper 37.

[0059] Specifically, the ink outlet holes are evenly arrayed along the length of the squeegee 37, with the lower end of the ink outlet holes close to the flexible printing head to ensure timely ink delivery to the surface of the printing head; the extension and retraction of the electric telescopic rod 36 drives the rotating component 38 to rotate the squeegee 37, thereby adjusting the squeegee angle between the squeegee 37 and the shoe upper 8 to adapt to the printing needs of different patterns.

[0060] In this embodiment, the feeding mechanism 4 includes a motor 41, the output shaft of the motor 41 is fixedly connected to a connecting column 42, and a placement frame 43 is provided on the side of the connecting column 42 through a connecting block array. The shoe upper 8 is arrayed inside the placement frame 43. A pusher motor 44 is inverted and embedded at an axially symmetrical position of the placement frame 43. A rotating rod 45 is fixedly connected to the output shaft of the pusher motor 44. The outer surface of the rotating rod 45 is rotatably connected to the body of the placement frame 43 through a bearing. A partition plate 46 is fixedly connected to the lower end of the rotating rod 45.

[0061] Specifically, the motor 41 is a stepper motor, and the connecting block connecting the connecting column 42 and the placement frame 43 is a detachable structure, which is fixed by bolts to facilitate the replacement of placement frames 43 of different sizes. The lower end of the placement frame 43 is provided with a sliding groove centered on the rotating disk 2, which facilitates the removal of shoe uppers placed on the surface of the rotating disk 2 from the placement frame 43, i.e., the two generate relative rotation. The inner wall of the placement frame 43 is lined with an anti-static silicone pad to prevent the shoe uppers 8 from sticking together due to static electricity. Its internal height is 5-10mm higher than the thickness of the shoe uppers 8 to ensure that the stacked shoe uppers 8 can fall freely. The rotating rod 45 is made of carbon steel with a rust-proof surface treatment. The bearing connected to the placement frame 43 is a deep groove ball bearing with low rotational resistance, which can realize the rapid flipping of the separator 46.

[0062] In this embodiment, the separator 46 has an arc-shaped flexible structure on both sides, and the thickness of the edge of the separator 46 in the longitudinal direction is one-tenth of the rear end of the shoe upper 8.

[0063] Specifically, the separator 46 is made of food-grade silicone with a Shore hardness of 40-50HA. The curvature of the curved structure on both sides is consistent with the inner curvature of the shoe upper 8, which can fit the contour of the shoe upper 8 and be smoothly inserted between the stacked shoe uppers 8. Its edge thickness in the length direction is 0.1-0.2mm. The thin edge design can reduce the insertion resistance and avoid damaging the surface material of the shoe upper 8. At the same time, the curved side can reduce the contact area with the shoe upper 8 and prevent adhesion during separation. In addition, this hardness can also keep the remaining shoe uppers 8 in the placement frame 43 from falling.

[0064] In this embodiment, a flexible printing head made of wear-resistant silicone is provided at the lower end of the scraper 37.

[0065] Specifically, the flexible printing head has a Shore hardness of 50-60HA, a thickness of 5-8mm, and a surface that has been precision polished with a flatness error of ≤0.02mm. The wear-resistant silicone material has good elastic recovery and can adapt to the slight curvature of the shoe upper 8 surface, ensuring full fit between the printing head and the shoe upper 8 during the printing process and avoiding missing or false printing.

[0066] principle:

[0067] The servo motor 6 inside the inverted cap 5 is started. The output shaft of the servo motor 6 drives the fixed helical gear 7 to rotate at a constant speed. The rotating helical gear 7 drives the rotating disk 2 to rotate smoothly along the ball bearings 10 at the upper end of the support frame 1 through tooth surface transmission. At the same time, the feeding mechanism 4 starts to work. When the servo motor 6 rotates to a preset angle, the feeding mechanism 4 separates the shoe upper 8 placed at the bottom inside it. The shoe upper 8 falls into the limiting post 20 arranged in an array that matches its shape. The servo motor 6 continues to rotate, and the shoe upper 8 placed on the surface of the rotating disk 2 enters the printing area.

[0068] The cylinder 9 inside the arc groove on the outer surface of the cap 5 starts to work. The extension and retraction of the piston rod of the cylinder 9 drives the printing plate 91 to rotate around the rotation point of the inner wall of the arc groove. The rotation angle of the printing plate 91 is adjusted so that the printing working surface of the printing plate 91 is parallel to the upper surface of the shoe upper 8 on the rotating disk 2 and the spacing is appropriate. The printing mechanism 3 completes a single printing.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A four-colour printed upper, comprising an upper (8), characterised in that: The vamp (8) is composed of a flexible substrate (80), a UV-cured marking layer (81) and a texture layer (82), the flexible substrate (80) is made of polyester fiber or mesh cloth, the UV-cured marking layer (81) is printed on the upper surface of the flexible substrate (80) for positioning and printing area, and the texture layer (82) is printed with four-color water-based ink.

2. A four color printed upper according to claim 1, wherein: The UV-cured marking layer (81) is connected to the surface of the flexible substrate (80) by physical adsorption and chemical combination through inkjet printing process with low-viscosity UV-cured ink, and the thickness of the marking layer after UV curing is 8-12 microns, the peeling strength of the marking layer with the flexible substrate (80) is greater than or equal to 1.5 N / cm, and there is no ink overflow and warping phenomenon at the edge of the marking layer.

3. A four color printed upper according to claim 2, wherein: The texture layer (82) is covered on the surface of the UV-cured marking layer (81) and the area of the flexible substrate (80) defined by the marking layer by screen printing process, the four-color water-based ink is permeated and attached to the surface of the UV-cured marking layer (81), the hydroxyl groups in the ink crosslink with the active functional groups on the surface of the UV-cured marking layer (81) to realize the stable connection between the texture layer (82) and the UV-cured marking layer (81).

4. A four color printed upper according to claim 3, wherein: The four-color water-based ink is composed of cyan, magenta, yellow and black environmentally friendly water-based resin ink, and 0.5-1.2% of flexible curing agent is added, the total thickness of the texture layer (82) is 30-50 microns, and the gap between the texture layer (82) and the UV-cured marking layer (81) is less than or equal to 5 microns.

5. The method of manufacturing a four-color printed upper according to any one of claims 1-4, wherein, The specific steps are as follows: Step one, cut the flexible substrate (80) to the size of the shoe type, clean the surface of the cut flexible substrate (80) to remove dust, fiber debris and other impurities, then put it into the drying machine, set the drying temperature to 50 degrees Celsius, and dry for 10-15 minutes to ensure that the surface of the flexible substrate (80) is dry and free of moisture; Step two, load the pre-set positioning pattern into the UV inkjet printer, set the printer nozzle diameter to 0.2 mm to ensure positioning accuracy, use UV-cured ink to print the UV-cured marking layer (81) on the upper surface of the flexible substrate (80), control the printing thickness of each layer to 8-12 microns, set the printing speed to 450-550 mm / s, and keep the printing environment temperature at 38-42 degrees Celsius, then perform immediate curing by UV curing equipment after printing, and the curing time is 30-60 seconds; Step three, according to the four-color separation screen corresponding to the design pattern, sequentially print the four-color water-based ink by screen printer, set the printing time of each color screen to 3-6 minutes, the ink layer thickness of single printing is 15-25 microns, and control the environmental humidity during printing to 40%-60% to ensure that the adjacent color ink layers connect naturally and the color superposition is uniform; Step four, after the four-color texture layer (82) is printed, put the vamp into the curing oven for heating and curing, set the curing temperature to 75-85 degrees Celsius, and the curing time is 6-10 minutes to make the four-color water-based ink fully adhere and form. Step five, after the curing of the upper (8) surface cleaning treatment, remove the edge excess ink, ink overflow and residual impurities, and then the appearance of quality inspection, size review and adhesion test, to ensure that the UV curing mark layer (81) positioning accurate, texture layer (82) color saturation no deviation, firmly attached no layer off.

6. The method of manufacturing a four-color printed upper according to claim 5, wherein: The support frame (1) is arranged in the screen printing of the third step, the upper end of the support frame (1) is arranged with ball groove, the inner wall of each ball groove is provided with ball (10), the upper end of the support frame (1) is rotatably connected with rotating disc (2), the upper end of the rotating disc (2) is arranged with limiting column (20), the upper end of the support frame (1) is arranged with printing mechanism (3), one side of the support frame (1) is arranged with feeding mechanism (4), the center of the support frame (1) is arranged with reverse cap (5), the inside of the reverse cap (5) is arranged with servo motor (6), the output shaft of the servo motor (6) is rotatably connected with the side surface of the reverse cap (5), the output shaft of the servo motor (6) is fixedly connected with helical gear (7); The upper surface of the rotating disc (2) near the center is arranged with tooth surface matched with the surface of the helical gear (7), and the surface of the helical gear (7) is engaged with the tooth surface of the rotating disc (2); The limiting column (20) is matched with the periphery of the upper (8); The outer surface of the reverse cap (5) is arranged with arc-shaped groove, the inner wall of each arc-shaped groove is arranged with air cylinder (9), the piston rod of each air cylinder (9) is rotatably connected with printing plate (91), one end of the printing plate (91) is rotatably connected with the inner wall of the arc-shaped groove; The printing mechanism (3) comprises a support rod (31) fixedly connected to the side surface of the support frame (1), a support plate (32) fixedly connected to the upper end of the support rod (31), a double-head air cylinder (33) fixedly connected to the upper end of the support plate (32), a feeding pipe (34) symmetrically arranged on the shell of the double-head air cylinder (33), a pump body fixedly connected to one end of the feeding pipe (34), the lower end of the pump body is fixedly connected with the upper surface of the double-head air cylinder (33), a connecting plate (35) fixedly connected between the two piston rods of the double-head air cylinder (33), an electric telescopic rod (36) arranged on the upper end of the connecting plate (35), and a scraper (37) rotatably connected to one end of the piston rod of the double-head air cylinder (33).

7. The method of manufacturing a four-color printed upper according to claim 6, wherein: The inner wall of one end of the feeding pipe (34) is fixedly communicated with the inner wall of the oil outlet hole, one end of the electric telescopic rod (36) is provided with a rotating part (38), the connecting rod of the rotating part (38) is rotatably connected with one end of the telescopic rod of the electric telescopic rod (36), and the lower end of the rotating part (38) is fixedly connected with the upper end of the scraper (37).

8. The method of manufacturing a four-color printed upper according to claim 7, wherein: The upper feeding mechanism (4) comprises a motor (41), the output shaft of the motor (41) is fixedly connected with a connecting column (42), the side surface of the connecting column (42) is provided with a placing frame (43) through a connecting block array, the vamp (8) array is inside the placing frame (43), the placing frame (43) is inversely embedded with a pushing motor (44) at the axisymmetric position, the output shaft of the pushing motor (44) is fixedly connected with a rotating rod (45), the outer surface of the rotating rod (45) is rotatably connected with the body of the placing frame (43) through a bearing, and the lower end of the rotating rod (45) is fixedly connected with a partition sheet (46).

9. The method of manufacturing a four-color printed upper according to claim 8, wherein: The partition sheet (46) is provided with an arc-shaped flexible structure on both side surfaces, and the length direction edge thickness of the partition sheet (46) is one tenth of the rear end of the vamp (8).

10. The method of manufacturing a four-color printed upper according to claim 9, wherein: The lower end of the scraper (37) is provided with a flexible printing head made of wear-resistant silica gel.

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