A color box UV three-dimensional varnish printing assembly with layered varnish coating cavities

Abstract

The utility model discloses a kind of layered varnish printing assembly of color box UV three-dimensional varnish with layered varnish coating cavity, including printing frame, UV curing device and coating roller, further including layered varnish coating cavity, the layered varnish coating cavity includes cavity shell and at least two layers of transverse arrangement's shunt baffle, the shunt baffle is divided into from top to bottom intercommunication upper buffer cavity, middle layer steady flow cavity and lower coating cavity, the top of the cavity shell is equipped with varnish inlet, the bottom of the cavity shell is equipped with the coating gap cooperation of coating roller with coating seam. Overall greatly improve coating uniformity, guarantee three-dimensional varnish effect, stable varnish performance, reduce printing defective rate, reduce varnish waste, reduce production cost, simplify maintenance process, improve equipment ease of use, adapt to different printing needs, enhance equipment versatility.

Description

Technical Field

[0001] This utility model relates to the field of printing equipment technology, specifically to a color box UV three-dimensional varnish printing component with a layered varnish coating cavity. Background Technology

[0002] In the field of color box processing, UV 3D varnish printing has become a key process for enhancing product added value because it can give the surface of color boxes a three-dimensional tactile feel and glossy texture. However, existing varnish coating components have many technical limitations: First, during the varnish delivery process, pressure fluctuations and uneven flow rates can easily lead to inconsistent coating thickness, resulting in localized areas of excessive thickness and sagging or excessive thinness exposing the substrate, affecting the uniformity of the three-dimensional effect; Second, air can easily mix into the varnish, generating bubbles that form defects after curing; Third, excess varnish is difficult to recover, resulting in material waste; Fourth, the components inside the coating chamber are mostly fixed structures, making maintenance and disassembly cumbersome after blockage, and it is difficult to adapt to the coating requirements of different varnish thicknesses. Utility Model Content

[0003] In order to overcome the shortcomings of existing technical solutions, this utility model provides a color box UV three-dimensional varnish printing component with a layered varnish coating cavity, which can effectively solve the problems mentioned in the background art.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A color box UV three-dimensional varnish printing assembly with a layered varnish coating chamber includes a printing frame, a UV curing device, and a coating roller. It also includes a layered varnish coating chamber, which includes a chamber shell and at least two layers of transversely arranged flow dividers. The flow dividers divide the chamber into an upper buffer chamber, a middle flow stabilizing chamber, and a lower coating chamber that are connected from top to bottom. The top of the chamber shell is provided with a varnish inlet, and the bottom of the chamber shell is provided with a coating slit that fits with the gap of the coating roller.

[0006] The flow divider is provided with staggered flow guide holes, and the diameter of the flow guide holes in the upper buffer cavity is larger than that in the middle flow stabilizing cavity.

[0007] The lower coating cavity is provided with a porous pressure equalizing plate, and the surface of the porous pressure equalizing plate is uniformly distributed with micropores and parallel to the coating seam.

[0008] As a further description of the above technical solution, the diversion baffle has three layers, including:

[0009] The first partition is located at the top of the cavity, with a guide hole diameter of 3-5mm and a hole spacing of 10-15mm;

[0010] The second partition is located in the middle of the cavity, and the diameter of the guide hole is 1.5-2.5mm, with the center of the hole staggered from that of the first partition.

[0011] The distance between the third partition and the porous equalizing plate is 5-8mm, and the diameter of its guide hole is ≤1mm.

[0012] As a further description of the above technical solution, the porous pressure equalizing plate is a detachable structure, and the porous pressure equalizing plate is connected to the side wall of the cavity shell through a slide rail, and the pore diameter of the micropores is 0.2-0.5mm.

[0013] As a further description of the above technical solution, the upper buffer cavity sidewall is provided with a pressure balance pipe, which is connected to an external negative pressure generator.

[0014] As a further description of the above technical solution, the flow guide holes are distributed in a concentric circle array on the surface of the partition plate, and the difference in the radius of the concentric circles of adjacent partition plates is 2-3 mm.

[0015] As a further description of the above technical solution, the bottom of the lower coating cavity is provided with an arc-shaped guide surface.

[0016] As a further description of the above technical solution, it also includes a recovery pipe for recovering varnish, which extends from both ends of the coating seam to the top of the cavity shell to form a closed loop.

[0017] As a further description of the above technical solution, a temperature sensor and a viscosity detector are installed inside the recovery pipe, which provide real-time feedback to the flow controller of the external oil supply pump.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] The present invention provides a color box UV three-dimensional varnish printing component with a layered varnish coating cavity, which has at least one of the following beneficial effects during use:

[0020] This UV 3D varnish printing assembly for color boxes, featuring a layered varnish coating chamber, effectively solves problems such as uneven coating, numerous bubbles, significant waste, and difficult maintenance found in existing equipment, offering substantial benefits. Its layered coating chamber, combined with staggered flow guide holes (large upper-layer holes for buffering, and small middle-layer holes for stable flow), ensures uniform flow rate and pressure of the varnish after a "buffering-stabilizing-pressure equalization" process. Combined with the lower-layer arc-shaped flow guide surface and porous pressure equalization plate, it prevents coating runs or exposed substrate, guaranteeing a consistent 3D varnish effect. The upper-layer air pressure balance pipe eliminates varnish bubbles, and the recovery pipe forms a closed-loop circuit to reduce material waste. Temperature and viscosity monitoring within the pipe allows for dynamic adjustment of the varnish state, reducing the defect rate. The porous pressure equalization plate is detachable via a sliding rail, allowing for maintenance without disassembling the chamber. Replacing different partitions or pressure equalization plates allows for adaptation to printing on both thin and thick color boxes, significantly improving equipment usability and versatility, while reducing production costs and contributing to increased color box printing efficiency and product qualification rates. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the equipment structure of a color box UV three-dimensional varnish printing component with a layered varnish coating cavity according to the present invention.

[0022] Figure 2 This is a side view of the layered varnish coating cavity of a color box UV three-dimensional varnish printing component with a layered varnish coating cavity according to the present invention.

[0023] Figure 3 This is a schematic cross-sectional view of the layered varnish coating cavity of a color box UV three-dimensional varnish printing component with a layered varnish coating cavity according to the present invention.

[0024] Numbering on the map:

[0025] 1. Printing frame; 101. Coating roller; 102. UV curing device; 2. Layered varnish coating chamber; 201. Chamber shell; 202. Flow divider; 203. Upper buffer chamber; 204. Middle flow stabilizing chamber; 205. Lower coating chamber; 206. First partition; 207. Second partition; 208. Third partition; 209. Porous pressure equalizing plate; 210. Arc-shaped guide surface; 211. Air pressure balance pipe; 212. Micropores; 213. Recovery pipe; 214. Coating seam. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figure 1-3 As shown, this utility model provides a color box UV three-dimensional varnish printing assembly with a layered varnish coating chamber 2, including a printing frame 1, a UV curing device 102 and a coating roller 101, and also includes a layered varnish coating chamber 2. The layered varnish coating chamber 2 includes a cavity shell 201 and at least two horizontally arranged flow dividers 202. The flow dividers 202 divide the cavity into an upper buffer chamber 203, a middle flow stabilizing chamber 204 and a lower coating chamber 205 that are connected from top to bottom. The top of the cavity shell 201 is provided with a varnish inlet, and the bottom of the cavity shell 201 is provided with a coating slit 214 that is clearance-fitted with the coating roller 101.

[0028] This embodiment operates using a "stable delivery of varnish → layered flow control → uniform coating → curing and recycling" method. The varnish enters the upper buffer chamber 203 through the varnish inlet at the top of the outer shell 201. At this time, the air pressure balance pipe 211 (connected to an external negative pressure generator) on the side wall of the upper buffer chamber 203 is activated, quickly expelling air from the chamber and maintaining a stable negative pressure. This prevents air bubbles from forming when the varnish enters due to residual air, and simultaneously balances the varnish delivery pressure through negative pressure, preventing pressure fluctuations from causing uneven coating amounts in subsequent applications.

[0029] The varnish enters the middle layer flow stabilization chamber 204 through the flow divider 202 (first divider 206, pore diameter 3-5mm, pore spacing 10-15mm) of the upper buffer chamber 203. The upper layer guide holes have a relatively large diameter to initially disperse the varnish, buffer the flow rate, and reduce direct impact on the middle layer. The varnish then enters the lower layer coating chamber 205 through the flow divider 202 (second divider 207, pore diameter 1.5-2.5mm, staggered from the guide holes of the first divider 206) of the middle layer flow stabilization chamber 204. The staggered distribution of the guide holes prevents the varnish from flowing straight along the same path, forcing it to form a short-distance turbulent buffer within the middle layer chamber; the smaller pore diameter further reduces the flow rate, allowing the varnish to transition from "rapid delivery" to "smooth transition". If the flow divider 202 has three layers, the varnish will pass through the third divider 208 (pore diameter ≤ 1mm, distance from the porous pressure equalizing plate 209 5-8mm) to achieve a third fine flow control, ensuring that the varnish flow rate entering the lower coating chamber 205 is uniform.

[0030] The flow divider 202 is provided with staggered flow guide holes, and the diameter of the flow guide holes in the upper buffer cavity 203 is larger than that in the middle flow stabilizing cavity 204.

[0031] The lower coating cavity 205 is provided with a porous pressure equalizing plate 209, and the surface of the porous pressure equalizing plate 209 is uniformly distributed with micropores 212 and parallel to the coating seam 214.

[0032] In this embodiment, the varnish is evenly transferred to the surface of the color box through the coating slit 214 (with a clearance fit with the coating roller 101). The rotation speed of the coating roller 101 is matched with the varnish output to ensure consistent coating thickness. After coating, the color box enters the UV curing device 102, where UV light rapidly irradiates the varnish layer, causing it to solidify instantly and form a three-dimensional effect. Overall, this significantly improves coating uniformity, ensures a three-dimensional varnish effect, stabilizes varnish performance, reduces printing defect rate, minimizes varnish waste, lowers production costs, simplifies maintenance processes, enhances equipment usability, adapts to different printing needs, and strengthens equipment versatility.

[0033] Furthermore, the diversion baffle 202 has three layers, including:

[0034] The first partition 206 is located at the upper part of the cavity, with a guide hole diameter of 3-5mm and a hole spacing of 10-15mm;

[0035] The second partition 207 is located in the middle of the cavity, and the diameter of the guide hole is 1.5-2.5mm. The center of the hole is staggered from that of the first partition 206.

[0036] The distance between the third partition 208 and the porous pressure equalizing plate 209 is 5-8mm, and the diameter of its guide hole is ≤1mm.

[0037] After undergoing three steps of "buffering → flow stabilization → pressure equalization", the flow rate and pressure of the varnish are completely uniform. When it passes through the coating seam 214, it can form a varnish layer of uniform thickness, avoiding the problems of "local excessive thickness (sagging)" or "local excessive thinness (exposed base)" and ensuring a uniform three-dimensional varnish effect on the surface of the color box.

[0038] Furthermore, the porous pressure equalizing plate 209 is a detachable structure. The porous pressure equalizing plate 209 is connected to the side wall of the cavity shell 201 via a slide rail. The diameter of the micropores 212 is 0.2-0.5mm.

[0039] In this embodiment, after the varnish enters the lower coating chamber 205, it first flows through the porous equalizing plate 209 (pore diameter 0.2-0.5mm, surface micropores 212 uniformly distributed and parallel to the coating seam 214). The fine structure of the micropores 212 "disperses" the varnish into a uniform fine stream, eliminating local flow velocity differences. The porous equalizing plate 209 is prone to clogging after long-term use; the slide rail connection design allows for quick disassembly for cleaning or replacement without disassembling the entire coating chamber.

[0040] Furthermore, the upper buffer chamber 203 is provided with a pressure balance pipe 211 on its side wall, and the pressure balance pipe 211 is connected to an external negative pressure generator.

[0041] The negative pressure environment eliminates air bubbles in the varnish, and the real-time temperature / viscosity monitoring prevents the varnish from thickening or thinning due to temperature changes. The flow controller dynamically adjusts the delivery volume. The combination of these three factors ensures that the varnish is always in the best printing condition, which can significantly reduce the defect rate.

[0042] Furthermore, the flow guide holes are distributed in a concentric circle array on the surface of the partition plate, and the difference in the radius of the concentric circles of adjacent partition plates is 2-3 mm.

[0043] By replacing the flow divider 202 with different apertures or the multi-hole pressure equalizing plate 209, the varnish output and coating thickness can be adjusted to meet the 3D varnish printing needs of different color boxes, from thin (such as gift boxes) to thick (such as cosmetic boxes), without having to replace the entire coating assembly.

[0044] Furthermore, the bottom of the lower coating cavity 205 is provided with an arc-shaped guide surface 210.

[0045] The arc-shaped guide surface 210 at the bottom of the lower coating chamber 205 guides the varnish along the arc path to the coating seam 214, avoiding varnish residue on the chamber wall or the formation of dead corners, and further ensuring stable varnish output.

[0046] Furthermore, it also includes a recovery pipe 213 for recovering varnish, which extends from both ends of the coating seam 214 to the top of the cavity shell 201, forming a closed loop.

[0047] Excess varnish that does not pass through the coating seam 214 is returned to the cavity through the recycling pipe 213 (extending from both ends of the coating seam 214 to the top of the cavity shell 201), forming a closed loop to avoid waste.

[0048] Furthermore, the recovery pipe 213 is equipped with a temperature sensor and a viscosity detector, which provide real-time feedback to the flow controller of the external oil supply pump.

[0049] The temperature sensor and viscosity detector inside the recovery pipe 213 collect data in real time and feed it back to the flow controller of the external oil supply pump to dynamically adjust the varnish temperature and delivery rate—ensuring that the varnish always maintains the optimal viscosity (avoiding uneven coating due to viscosity changes).

[0050] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A UV three-dimensional varnish printing assembly for color boxes with a layered varnish coating chamber, comprising a printing frame, a UV curing device, and a coating roller, characterized in that: It also includes a layered varnish coating chamber, which includes a chamber shell and at least two layers of transversely arranged flow dividers. The flow dividers divide the chamber into an upper buffer chamber, a middle flow stabilizing chamber, and a lower coating chamber that are connected from top to bottom. The top of the chamber shell is provided with a varnish inlet, and the bottom of the chamber shell is provided with a coating slit that matches the gap between the coating rollers. The flow divider is provided with staggered flow guide holes, and the diameter of the flow guide holes in the upper buffer cavity is larger than that in the middle flow stabilizing cavity. The lower coating cavity is provided with a porous pressure equalizing plate, and the surface of the porous pressure equalizing plate is uniformly distributed with micropores and parallel to the coating seam.

2. The color box UV three-dimensional varnish printing assembly with a layered varnish coating cavity according to claim 1, characterized in that: The diversion baffle has three layers, including: The first partition is located at the top of the cavity, with a guide hole diameter of 3-5mm and a hole spacing of 10-15mm; The second partition is located in the middle of the cavity, and the diameter of the guide hole is 1.5-2.5mm, with the center of the hole staggered from that of the first partition. The distance between the third partition and the porous equalizing plate is 5-8mm, and the diameter of its guide hole is ≤1mm.

3. The color box UV three-dimensional varnish printing assembly with a layered varnish coating cavity according to claim 1, characterized in that: The porous pressure equalizing plate is a detachable structure. The porous pressure equalizing plate is connected to the side wall of the cavity shell through a slide rail. The diameter of the micropores is 0.2-0.5mm.

4. The color box UV three-dimensional varnish printing assembly with a layered varnish coating cavity according to claim 1, characterized in that: The upper buffer chamber is provided with a pressure balancing pipe on its side wall, and the pressure balancing pipe is connected to an external negative pressure generator.

5. A color box UV three-dimensional varnish printing assembly with a layered varnish coating cavity according to claim 2, characterized in that: The flow guide holes are arranged in a concentric circle array on the surface of the partition plate, and the difference in the radius of the concentric circles of adjacent partition plates is 2-3 mm.

6. The color box UV three-dimensional varnish printing assembly with a layered varnish coating cavity according to claim 1, characterized in that: The bottom of the lower coating chamber is provided with an arc-shaped guide surface.

7. A color box UV three-dimensional varnish printing assembly with a layered varnish coating cavity according to claim 1, characterized in that: It also includes a recycling pipe for recovering varnish, which extends from both ends of the coating seam to the top of the cavity shell, forming a closed loop.

8. A color box UV three-dimensional varnish printing assembly with a layered varnish coating cavity according to claim 7, characterized in that: The recovery pipe is equipped with a temperature sensor and a viscosity detector, which provide real-time feedback to the flow controller of the external oil supply pump.

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