Sheet metal part capable of preventing fading during silk-screen printing

Abstract

The invention discloses a silk-screen anti-fading sheet metal part, and belongs to the technical field of sheet metal part processing and surface treatment. Comprising a metal plate, a reinforcing mechanism, a silk-screen pattern layer and a protection mechanism, the reinforcing mechanism, the silk-screen pattern layer and the protection mechanism are sequentially arranged from bottom to top, the reinforcing mechanism comprises a pretreatment layer coated on the metal plate and a circular-truncated-cone-shaped anchoring protrusion on the surface, the anchoring protrusion is filled and wrapped with the silk-screen pattern layer to form mechanical occlusion, and the protection mechanism is composed of an inner protection layer and an outer protection layer. Hemispherical micro-protrusions are arranged on the surface of the outer protective layer, and the edges of the silk-screen layer and the protective layer are distributed in a step shape and wrapped by a sealing layer. Through the double-layer protection structure and the stepped sealing design, the problems that silk-screen patterns are prone to fading and aging and edge water seepage is caused are solved, the embedded woven mesh enhances the rigidity of the base material, coating cracking caused by deformation is prevented, the visual stability of the sheet metal part in the severe environment is remarkably improved, and the service life of the sheet metal part in the severe environment is remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of sheet metal processing and surface treatment technology, and in particular to a sheet metal part with anti-fading screen printing. Background Technology

[0002] Sheet metal parts serve as the basic housings or structural components for various mechanical equipment, electronic instruments, and household appliances, and are widely used in industrial production and daily life. To achieve functions such as product identification, operating instructions, or aesthetic decoration, screen printing is typically applied to the surface of sheet metal parts to create text or graphic layers. Traditional sheet metal screen printing processes often involve directly printing ink onto the metal surface or a simple primer layer, followed by drying and curing.

[0003] However, in practical use, this conventional screen printing structure faces severe durability challenges. Because the surface of the metal substrate is relatively smooth and differs significantly from the thermal expansion coefficient of organic inks, relying solely on interfacial chemical adhesion is often insufficient to withstand long-term environmental stress. Especially outdoors or in harsh conditions, sheet metal parts are frequently exposed to strong ultraviolet radiation, rain, and physical scratches, easily leading to peeling and flaking of the screen-printed pattern layer. Simultaneously, the lack of effective surface protection measures makes the pigments prone to fading due to oxidation or photodecomposition, severely affecting the product's aesthetics and information readability.

[0004] Furthermore, sheet metal parts themselves undergo slight deformation when subjected to external impacts or drastic temperature changes. This deformation of the substrate is directly transferred to the already weak adhesion of the screen printing layer, causing the coating to stretch or even crack. While existing technologies attempt to alleviate this problem by adding a protective film, they often neglect the systematic design of a comprehensive system from substrate reinforcement and interface anchoring to surface protection. This results in a single protective effect, failing to fundamentally solve the complex problem of screen printing layer fading and peeling. Therefore, a sheet metal part designed to prevent screen printing from fading is proposed to address these issues. Summary of the Invention

[0005] In view of the existing technology, the lack of a mechanical locking structure between the metal substrate and the screen printing layer in the anti-fading sheet metal parts results in insufficient adhesion, which makes them prone to peeling and falling off due to environmental stress during long-term use. In addition, the single structure of the protective layer makes it difficult to resist physical scratches and chemical corrosion at the same time, which leads to fading and aging of the pattern layer. The present invention aims to provide an anti-fading sheet metal part with an improved structure that can effectively solve the above problems.

[0006] The present invention provides a sheet metal part with anti-fading screen printing, comprising: a metal plate, a reinforcing mechanism disposed on the surface of the metal plate, a screen printing pattern layer disposed on the surface of the reinforcing mechanism, and a protective mechanism covering the surface of the screen printing pattern layer.

[0007] The reinforcement mechanism includes a pretreatment layer coated on the surface of the metal plate, and the surface of the pretreatment layer is arrayed with a plurality of anchoring protrusions. The anchoring protrusions are designed as frustum structures with an upper end face area smaller than the lower end face area, providing space for physical embedding of the upper structure through the change in geometry.

[0008] Furthermore, the screen-printed pattern layer, the reinforcing mechanism, and the protective mechanism are combined through a specific layered stacking and mechanical interlocking method. The screen-printed pattern layer fills the spaces between adjacent anchoring protrusions and wraps around the outer surface of the anchoring protrusions, so that the screen-printed pattern layer and the pretreatment layer are mechanically interlocked and fixed through the anchoring protrusions, thereby transforming simple chemical bonding into stable physical anchoring. The protective mechanism includes an inner protective layer and an outer protective layer stacked together. The bottom surface of the inner protective layer is fixedly connected to the surface of the screen-printed pattern layer, and the bottom surface of the outer protective layer is fixedly connected to the surface of the inner protective layer. The surface of the outer protective layer is integrally formed with a plurality of hemispherical micro-protrusions, which protrude from the surface of the outer protective layer.

[0009] Preferably, the edges of the screen-printed pattern layer, the inner protective layer, and the outer protective layer have a stepped distribution feature that gradually shrinks from the inside to the outside, and the coverage area of ​​the screen-printed pattern layer, the inner protective layer, and the outer protective layer decreases sequentially. This multi-level stepped structure can effectively disperse the stress at the edges and prevent the coating from cracking and peeling under stress concentration.

[0010] Preferably, the screen-printed anti-fading sheet metal part further includes a sealing layer, which is fixedly connected to the edge of the metal plate. The inner side of the sealing layer is bonded and fixed to the sidewall of the screen-printed pattern layer, the inner protective layer, and the outer protective layer, respectively. The bottom surface of the sealing layer is bonded and fixed to the surface of the metal plate, which is used to completely seal the gaps between the layers from the side and prevent moisture and pollutants from penetrating.

[0011] Preferably, a woven mesh is embedded inside the metal plate. The woven mesh and the metal plate are composite formed by hot rolling. The woven mesh is laid along the extension direction of the metal plate and located in the middle of the thickness direction of the metal plate. It is used to enhance the structural strength and toughness of the substrate and prevent the upper protective layer from being damaged due to substrate deformation.

[0012] Preferably, the woven mesh is made of stainless steel, which utilizes its high strength and corrosion resistance to improve impact resistance while ensuring the flexibility of the substrate.

[0013] Preferably, the anchoring protrusions are evenly distributed in an array on the surface of the pretreatment layer to ensure that the screen-printed pattern layer can obtain uniform mechanical support force across the entire plate.

[0014] Preferably, the hemispherical micro-protrusions are distributed in a square array on the surface of the outer protective layer. The micro-protrusions change the wettability and reflective properties of the surface, assisting in drainage and reducing environmental glare.

[0015] Preferably, the inner protective layer is made of polyurethane wear-resistant coating, which has high mechanical strength and is used to resist scratches from hard objects in daily use; the outer protective layer is made of polyvinyl fluoride weather-resistant coating, which utilizes its chemical stability to achieve long-term UV protection and corrosion protection.

[0016] The present invention has the following beneficial effects:

[0017] 1. This invention solves the problem that traditional sheet metal screen printing layers rely mainly on chemical adhesion and are prone to peeling and falling off due to aging or external force by setting a pretreatment layer with anchoring protrusions between the metal plate and the screen printing pattern layer. It achieves the technical effect of using frustum-shaped protrusions to form a strong mechanical interlocking structure, greatly increasing the contact area and shear resistance, and effectively preventing the screen printing pattern layer from delaminating and falling off.

[0018] 2. This invention solves the problem that a single coating cannot simultaneously achieve both physical wear resistance and chemical weather resistance, which leads to the screen-printed pattern being easily scratched or fading due to ultraviolet radiation. It achieves the technical effect of the inner polyurethane layer's high hardness and scratch resistance protecting the pattern's integrity, and the outer polyvinyl fluoride layer's resistance to ultraviolet radiation and acid rain corrosion preventing fading, thereby significantly extending the service life and color retention of sheet metal parts.

[0019] 3. This invention solves the problem that the base sheet metal layer is prone to bending and deformation when subjected to external impact or large temperature changes, which in turn leads to the surface coating being stretched and cracked. By embedding a stainless steel woven mesh inside the metal plate, this invention achieves the technical effect of enhancing the overall rigidity and tensile strength of the sheet metal parts, effectively dispersing external stress, and ensuring the stability of the upper coating structure from the substrate level.

[0020] 4. This invention solves the problems of severe reflection on smooth surfaces under strong light affecting pattern visibility and rainwater accumulation on the surface leading to localized aging of the coating by setting hemispherical micro-convexities in an array on the surface of the outer protective layer. It achieves the technical effect of destroying specular reflection to reduce glare, using hydrophobic effect to form rolling water droplets to remove surface dust and achieve self-cleaning, keeping the surface clean and dry.

[0021] 5. This invention solves the problems of stress concentration leading to cracking at the edges of multi-layer structures and the easy infiltration of moisture from side gaps causing internal oxidation by designing the edges of each coating in a stepped distribution and wrapping them with a sealing layer. It achieves the technical effect of dispersing edge stress, increasing the sealing contact area, forming a tight lateral blockage, and completely blocking the path of moisture intrusion. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of a sheet metal part designed to prevent fading during screen printing, as proposed in this invention.

[0023] Figure 2 This is a schematic diagram of the structure of the outer protective layer for screen-printed sheet metal parts to prevent color fading, as proposed in this invention.

[0024] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 A schematic diagram of the structure of a sealing layer for a screen-printed sheet metal part that prevents color fading, as proposed in this invention;

[0026] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0027] Legend:

[0028] 1. Metal plate; 2. Silk screen pattern layer; 3. Protective mechanism; 31. Outer protective layer; 32. Inner protective layer; 33. Hemispherical micro-convexity; 34. Sealing layer; 35. Woven mesh; 4. Reinforcing mechanism; 41. Pretreatment layer; 42. Anchoring protrusion. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example:

[0031] Reference Figures 1 to 5 This invention provides a screen-printed sheet metal part that is resistant to fading, which aims to solve the structural defects in the prior art, such as the screen-printed pattern layer on the surface of sheet metal parts being prone to peeling and falling off due to insufficient adhesion, fading and aging due to environmental erosion, and cracking of the coating due to substrate deformation.

[0032] A main structure for a screen-printed, color-resistant sheet metal part comprises, from bottom to top, a metal plate 1, a reinforcing mechanism 4 coated on the surface of the metal plate 1, a screen-printed pattern layer 2 filled and fixed to the surface of the reinforcing mechanism 4, and a protective mechanism 3 layered and covering the surface of the screen-printed pattern layer 2. The metal plate 1 serves as the mounting base and load-bearing body of the overall structure, providing basic physical support and rigidity maintenance. The reinforcing mechanism 4 serves as an intermediate medium layer, enhancing the mechanical interlocking force between the metal plate 1 and the upper structure to prevent delamination. The screen-printed pattern layer 2 serves as a visual display layer, displaying text, images, or decorative information. The protective mechanism 3 provides closed protection for the lower screen-printed pattern layer 2 from both physical and chemical perspectives, blocking direct erosion from the external environment.

[0033] The metal plate 1 is embedded with a woven mesh 35. The woven mesh 35 and the metal plate 1 are composite formed by hot rolling process. The woven mesh 35 is laid along the extension direction of the metal plate 1 and is located in the middle position of the thickness direction of the metal plate 1. The woven mesh 35 is made of stainless steel. Utilizing the high strength characteristics of the woven mesh 35, it can effectively disperse the stress of the metal plate 1 when it is subjected to external impact or temperature difference change, improve the overall tensile and shear resistance, and prevent the silk screen pattern layer 2 and the protective mechanism 3 above from being stretched and cracked due to the bending deformation of the substrate.

[0034] The reinforcement mechanism 4 specifically includes a pretreatment layer 41 coated on the top surface of the metal plate 1. The top surface of the pretreatment layer 41 is integrally formed with a number of anchoring protrusions 42. The anchoring protrusions 42 are designed as a frustum structure with an upper end area smaller than the lower end area, and are evenly distributed in an array on the surface of the pretreatment layer 41. This frustum-shaped geometric feature makes the anchoring protrusions 42 have a mechanical locking effect similar to a "dovetail groove" or an "expansion bolt".

[0035] When the silkscreen pattern layer 2 is applied in liquid form, it can flow fully and fill the space between adjacent anchor protrusions 42. After curing, it tightly wraps the outer surface and sidewalls of the anchor protrusions 42. The silkscreen pattern layer 2 and the pretreatment layer 41 form a multi-dimensional three-dimensional inlay structure through the anchor protrusions 42, rather than a simple planar bonding. The resulting mechanical interlocking force can significantly resist shearing and peeling forces, preventing the silkscreen pattern layer 2 from peeling off the surface of the metal plate 1.

[0036] The protective mechanism 3 is located above the screen-printed pattern layer 2 and consists of two parts: an inner protective layer 32 and an outer protective layer 31. The bottom surface of the inner protective layer 32 is directly fixed to the surface of the screen-printed pattern layer 2. Its material is a polyurethane wear-resistant coating. Utilizing the high hardness and scratch-resistant properties of polyurethane, it serves as the first line of defense against physical scratches and prevents sharp objects from directly damaging the screen-printed pattern layer 2. The bottom surface of the outer protective layer 31 is fixed to the top surface of the inner protective layer 32. Its material is a polyvinyl fluoride weather-resistant coating. Utilizing the excellent chemical inertness of polyvinyl fluoride, it blocks ultraviolet radiation and acid rain corrosion, preventing the screen-printed pattern layer 2 from fading due to light or oxidation.

[0037] The top surface of the outer protective layer 31 is also integrally formed with several hemispherical micro-protrusions 33. The hemispherical micro-protrusions 33 are distributed in a square array on the surface of the outer protective layer 31 and protrude from the surface of the outer protective layer 31. The hemispherical micro-protrusions 33 can destroy the specular reflection of light, reduce glare, and improve the visibility of the pattern under strong light. At the same time, the hydrophobic effect formed by the micro-protrusions allows rainwater to form rolling water droplets on the surface and carry away dust, keeping the surface clean and preventing stains from adhering for a long time and causing the protective layer to age.

[0038] In a preferred embodiment, the edges of the silkscreen pattern layer 2, the inner protective layer 32, and the outer protective layer 31 are not vertically aligned, but rather distributed in a stepped manner, receding from the inside out. This structure ensures that the edges of each coating layer are not on the same vertical plane, thereby dispersing stress concentration at the edges. The coverage area of ​​the silkscreen pattern layer 2, the inner protective layer 32, and the outer protective layer 31 decreases sequentially, exposing the edge portions of the underlying structure and providing a multi-step adhesive contact surface for the subsequent sealing structure. The sealing layer 3 is fixedly connected to the top edge of the metal plate 1. 4. The sealing layer 34 is designed as a rectangular frame surrounding the overall structure. The inner side of the sealing layer 34 is bonded and fixed to the side walls exposed by the silk screen pattern layer 2, the inner protective layer 32, and the outer protective layer 31 due to their stepped distribution. The sealing layer 34 can fill the gaps between the layers, forming a tight lateral wrapping. The bottom surface of the sealing layer 34 is directly bonded and fixed to the surface of the metal plate 1, using the metal plate 1 as a base support. The top surface of the sealing layer 34 is designed to be flush with the top surface of the outer protective layer 31, thereby ensuring the overall flatness and aesthetics of the sheet metal surface.

[0039] The implementation principle of this application embodiment is as follows: When the sheet metal part is subjected to external physical scratches, impacts, or is used in harsh environments such as strong ultraviolet rays or acid rain, the structure achieves comprehensive protection through a multi-layer collaborative mechanism. The stainless steel woven mesh 35 embedded in the metal plate 1 plays a role first, using its excellent tensile and shear resistance to disperse external impact forces and limit the local deformation of the metal plate 1, thereby preventing the silk screen pattern layer 2 and the protective coating above from being stretched and cracked due to the bending of the substrate.

[0040] The connection between the screen-printed pattern layer 2 and the metal plate 1 is strengthened by the reinforcing mechanism 4. The frustum-shaped anchoring protrusions 42 on the pretreatment layer 41 are wrapped by the screen-printed pattern layer 2, forming a strong mechanical interlocking similar to a tenon and mortise structure. This interlocking force is much greater than that of simple chemical adhesion, and it can effectively prevent the screen-printed pattern layer 2 from peeling off even when subjected to shear force or thermal expansion and contraction stress.

[0041] In the face of environmental erosion, the protective structure 3 provides dual protection. The PVC weather-resistant coating of the outer protective layer 31 directly blocks ultraviolet rays and rainwater, preventing the screen printing pigments from oxidizing and fading. The hemispherical micro-convexities 33 on its surface can not only disperse the scratching force, but also make rainwater form rolling water droplets through the hydrophobic effect to carry away dirt and keep the surface clean. The polyurethane wear-resistant coating of the inner protective layer 32 resists daily wear with its high hardness, protecting the pattern layer below from damage.

[0042] Each layer is staggered in a stepped manner at the edge, and with the surrounding sealing layer 34, the sides of all coatings are tightly sealed. The sealing layer 34 fills the gaps between the steps and is tightly bonded to the metal plate 1, completely blocking the path of moisture seeping in from the edge gaps, preventing edge delamination and internal oxidation caused by moisture erosion, thereby significantly extending the service life and color retention of the screen-printed sheet metal parts.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sheet metal part with anti-fading screen printing, comprising: Metal plate (1), reinforcement mechanism (4) disposed on the surface of the metal plate (1), screen printing pattern layer (2) disposed on the surface of the reinforcement mechanism (4), and protective mechanism (3) covering the surface of the screen printing pattern layer (2). The feature is that the reinforcement mechanism (4) includes a pretreatment layer (41) coated on the surface of the metal plate (1), and the surface of the pretreatment layer (41) is provided with a plurality of anchoring protrusions (42). The screen-printed pattern layer (2) fills between adjacent anchor protrusions (42) and wraps the outer surface of the anchor protrusions (42). The screen-printed pattern layer (2) and the pretreatment layer (41) are mechanically interlocked and fixed through the anchor protrusions (42). The protective mechanism (3) includes an inner protective layer (32) and an outer protective layer (31) stacked together. The bottom surface of the inner protective layer (32) is fixedly connected to the surface of the silk screen pattern layer (2), and the bottom surface of the outer protective layer (31) is fixedly connected to the surface of the inner protective layer (32). The outer protective layer (31) has a plurality of hemispherical micro-protrusions (33) integrally formed on its surface, and the hemispherical micro-protrusions (33) protrude from the surface of the outer protective layer (31).

2. The sheet metal part with anti-fading screen printing according to claim 1, characterized in that, The edges of the silkscreen pattern layer (2), the inner protective layer (32), and the outer protective layer (31) are distributed in a stepped manner, gradually receding from the inside to the outside, and the coverage area of ​​the silkscreen pattern layer (2), the inner protective layer (32), and the outer protective layer (31) decreases sequentially.

3. The sheet metal part with anti-fading screen printing according to claim 2, characterized in that, The metal plate (1) is fixedly connected to a sealing layer (34) at its edge. The inner side of the sealing layer (34) is bonded and fixed to the sidewalls of the silk screen pattern layer (2), the inner protective layer (32), and the outer protective layer (31), respectively. The bottom surface of the sealing layer (34) is bonded and fixed to the surface of the metal plate (1).

4. A sheet metal part with anti-fading screen printing according to claim 1, characterized in that, The metal plate (1) is embedded with a woven mesh (35), which is formed by hot rolling process. The woven mesh (35) is laid along the extension direction of the metal plate (1).

5. A sheet metal part with anti-fading screen printing according to claim 4, characterized in that, The woven mesh (35) is made of stainless steel and is located in the middle of the thickness direction of the metal plate (1).

6. A sheet metal part with anti-fading screen printing according to claim 1, characterized in that, The anchoring protrusion (42) is a frustum structure with an upper surface area smaller than the lower surface area, and the anchoring protrusion (42) is uniformly arrayed on the surface of the pretreatment layer (41).

7. A sheet metal part with anti-fading screen printing according to claim 1, characterized in that, The hemispherical micro-protrusions (33) are distributed in a square array on the surface of the outer protective layer (31).

8. A sheet metal part with anti-fading screen printing according to claim 1, characterized in that, The inner protective layer (32) is made of polyurethane wear-resistant coating, and the outer protective layer (31) is made of polyvinyl fluoride weather-resistant coating.

Images