A glue coating resin buffering and draining discharging device and a glue coating resin discharging method
Patent Information
- Application Number
- CN202610860083.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-15
- Publication Date
- 2026-09-18
AI Technical Summary
[0005]本发明所要解决的技术问题在于，提供一种胶衣树脂的缓冲引流下料装置及胶衣树脂的下料方法，旨在解决现有技术中胶衣树脂直接下料至薄膜上所产生的分色、发花以及重质填料冲刷造成条痕等技术问题
本发明中的一种胶衣树脂的缓冲引流下料装置，通过设置向下凹陷的弧形导流槽，使胶衣树脂沿斜边先流入导流槽再经底部出料口流出，垂直下落动能被斜坡缓冲耗散，胶衣树脂中的重质填料不再具备冲击薄膜的动量，从而彻底消除了深色冲刷条痕。其次，本装置将出料口设于薄膜上方，且挂钩与刮刀上端连接、搭接部与支撑座搭接使装置稳定定位，当薄膜上堆积起胶衣液面后，出料口自然浸没于液面以下，新料从液面下方释放，其表面浮出的色粉被旧料包裹，永远不会直接暴露于薄膜，实现了“先包裹后接触”，从根本上解决了浮色转印导致的分色问题。此外，本装置仅由导流部、挂钩和搭接部组成，可采用不锈钢板一体成型，无需额外动力或控制系统，安装便捷、兼容现有生产线，推广应用门槛低。
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Figure CN122770182A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of composite material processing technology, and in particular to a buffer guide feeding device and a feeding method for gel coat resin. Background Technology
[0002] Continuous molding is one of the mainstream methods for producing gelcoat flat sheets. This process typically involves uniformly mixing the gelcoat resin (an unsaturated polyester resin with added colorant, filler, and various additives) with a curing agent, then directly casting it onto a continuously moving BOPET film. The width is then controlled by an edge cutter, and the thickness by a scraper. Finally, the gelcoat layer is cured in a curing section, resulting in a gelcoat flat sheet product of the desired specifications.
[0003] Existing gel coat resins are typically complex multi-component systems, incorporating color pastes / powders, wetting and dispersing agents, thixotropic agents, and fillers such as nano-calcium, titanium dioxide, and abrasion-resistant white corundum into an unsaturated polyester resin matrix. Due to density differences among the components, lightweight color powders tend to float, while heavy fillers tend to settle. Furthermore, the limited compatibility between some organic pigments and the matrix resin makes color separation, floating color, and blooming phenomena highly likely during production, commonly known as "color separation" or "blooming." This is a widespread and difficult-to-resolve problem in the plastics coloring and coatings industry.
[0004] In existing technologies, two main measures are typically taken to mitigate this problem: first, adding wetting and dispersing agents, coupling agents, and other additives during the gel coat formulation stage to enhance the compatibility between pigments and resins, thereby reducing pigment repulsion at the molecular level; second, adjusting doctor blade parameters and controlling casting speed on the production line to maintain the uniformity of gel coat spreading as much as possible. However, these measures can only alleviate color separation to a certain extent and cannot completely eliminate the problem. When the gel coat is directly applied to the BOPET film, the light, floating pigment is immediately exposed on the surface and transferred by the film, while the impact of the heavy filler washes out darker flow marks on the film, ultimately resulting in obvious color unevenness on the finished surface of the gel coat sheet. This leads to substandard product quality, resulting in a large number of scraps and significant economic losses. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to provide a buffer guide feeding device and a feeding method for gel coat resin, which aims to solve the technical problems such as color separation, blooming and streaks caused by heavy filler erosion when gel coat resin is directly fed onto the film in the prior art.
[0006] To address the aforementioned technical problems, the present invention provides, in a first aspect, a buffered flow guiding and feeding device for gelcoat resin, used for buffered flow guiding and feeding of gelcoat resin in a machine-made gelcoat flat sheet production line, comprising: a flow guiding part, wherein the flow guiding part is provided with a downwardly recessed arc-shaped flow guiding groove, and the bottom of the arc-shaped flow guiding groove is provided with a discharge port; the discharge port is located above the gelcoat film to be processed; a hook, one end of which is connected to the upper end of the scraper of the machine-made equipment, and the other end of the hook extends downward along the side wall of the scraper and is connected to the first end of the flow guiding groove; an overlapping part, one end of which overlaps with the support base of the machine-made equipment, and the overlapping part is connected to the second end of the flow guiding groove through a bevel; the discharge port of the machine-made equipment is located above the bevel.
[0007] As an improvement to the above solution, the distance between the discharge port and the surface of the gelcoat film is 5mm to 15mm; when the height of the accumulated gelcoat resin liquid on the film exceeds this distance, the discharge port is submerged below the surface of the gelcoat resin liquid.
[0008] As an improvement to the above solution, the discharge port is a plurality of discharge ports spaced apart along the bent portion at the bottom of the arc-shaped guide channel, and the plurality of discharge ports are arranged in a row.
[0009] As an improvement to the above solution, the length of the discharge port is 30mm~50mm and the width is 4mm~8mm, and the short side of the discharge port is arc-shaped.
[0010] As an improvement to the above solution, the inclination angle of the inclined side is adapted to the slope surface of the arc-shaped guide channel.
[0011] As an improvement to the above solution, the hook is a J-shaped hook; the overlapping part is a flat plate or an arc-shaped overlapping surface adapted to the support shaft on the support base.
[0012] In a second aspect, the present invention provides a method for feeding gel coat resin, comprising the following steps: S1: Based on actual processing requirements, manufacture the buffer flow guiding and feeding device as described in any one of claims 1 to 6; S2: Attach the hook to the upper end of the scraper and overlap the joint with the support base or support shaft to keep the gel coat feeding tool stationary relative to the scraper and support base; S3: Adjust the height of the feeding device so that the distance between the lowest point of its discharge port and the surface of the gel coat film is 5mm to 15mm; S4: Mix the gel coat resin and curing agent evenly, and continuously discharge the material from the discharge port to the inclined side, and then flow into the arc-shaped guide groove of the guide section through the inclined side; S5: The gel coat resin flows downward along the arc-shaped guide channel. After being buffered by the guide channel, it flows out continuously from the outlet at the bottom of the guide channel and falls onto the film. Under the scraping action of the doctor blade, the gel coat resin forms a gel coat layer of the required thickness and width on the film and continues to form as the film moves forward.
[0013] As an improvement to the above scheme, in step S5, when the height of the gel coat resin liquid already accumulated on the film exceeds the distance between the outlet and the film surface, the outlet is submerged below the gel coat resin liquid surface, and the newly fed gel coat resin directly enters the interior of the old gel coat resin to form a dynamic coating.
[0014] As an improvement to the above solution, the dynamic coating process is as follows: the newly fed gel coat resin is coated from the outside by the old gel coat resin, and the pigment powder that floats on the surface of the new gel coat resin due to the incompatibility and repulsion between molecules is wrapped inside, preventing the floating pigment from directly contacting the film; at the same time, the pigment paste accumulation caused by the scouring of heavy fillers is also wrapped inside the gel coat resin and is not transferred to the surface of the film.
[0015] As an improvement to the above solution, the processing of the gel coat buffer drainage and feeding device described in S1 includes the following steps: The outline of the feed hole is engraved on the stainless steel plate to be processed; Drill holes in the carved stainless steel plate; The hollowed-out stainless steel plate is bent to form a guide channel and a beveled edge; The bent and shaped guide channel and the bevel are welded to the hook and the overlapping part respectively to form the target feeding device.
[0016] The beneficial effects of implementing this invention are as follows: This invention discloses a buffered flow guiding and feeding device for gelcoat resin. By setting a downwardly recessed arc-shaped guide channel, the gelcoat resin first flows into the guide channel along the inclined side and then flows out through the bottom outlet. The kinetic energy of the vertical fall is buffered and dissipated by the slope, and the heavy fillers in the gelcoat resin no longer have the momentum to impact the film, thus completely eliminating dark-colored scouring streaks. Secondly, this device positions the outlet above the film, and the hook is connected to the upper end of the scraper, and the overlapping part is connected to the support base, ensuring stable positioning. When gelcoat liquid accumulates on the film, the outlet naturally submerges below the liquid surface. New material is released from below the liquid surface, and the pigment powder floating on the surface is wrapped by the old material, never directly exposed to the film, achieving "encapsulation before contact," fundamentally solving the color separation problem caused by floating color transfer. Furthermore, this device consists only of a guide section, a hook, and an overlapping part, and can be integrally formed from stainless steel plates. It requires no additional power or control system, is easy to install, compatible with existing production lines, and has a low barrier to entry for widespread application.
[0017] This invention discloses a method for feeding gel coat resin. By pre-setting the distance between the discharge port and the film, the resin naturally accumulates during production, causing the liquid level to rise automatically, thus achieving passive immersion of the discharge port. New material is released from below the liquid surface, and the pigment powder floating on its surface is encapsulated by the old material, completely blocking the path of pigment transfer to the film. Simultaneously, the buffering effect of the arc-shaped guide channel eliminates impact streaks on the film from heavy fillers. This method requires no additional sensors or actuators, has high reliability, significantly reduces scrap rates and production costs, and ensures long-term uniform color on the product surface. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the installation of a buffer drainage and feeding device for gel coat resin in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a buffer guide feeding device for gel coat resin in an embodiment of this application; Figure 3 This is a schematic diagram showing the distribution of the outlet of a buffer guide feeding device for gel coat resin in an embodiment of this application. Figure 4 This is a process flowchart of a method for feeding gel coat resin according to an embodiment of this application; Figure 5 This is a simplified dynamic diagram of the dynamic coating process in a gel coat resin feeding method according to an embodiment of this application.
[0019] The reference numerals in the attached drawings are explained as follows: 100, guide section; 110, guide channel; 111, discharge port; 200, hook; 300, overlap section; 400, bevel; 500, discharge port; 610, scraper; 620, support base; 621, support shaft; 630, gel coat film. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.
[0021] See Figures 1-2 , Figure 1 This is a schematic diagram of the installation of a buffer drainage and feeding device for gel coat resin in an embodiment of this application; Figure 2This is a schematic diagram of a buffered flow guiding and feeding device for gel coat resin in an embodiment of this application. As shown in the figure, the device is used to buffer and guide the flow of gel coat resin in a machine-made gel coat flat sheet production line. It includes: a flow guiding part 100, on which a downwardly recessed arc-shaped flow guiding groove 110 is provided, and a discharge port 111 is provided at the bottom of the arc-shaped flow guiding groove 110; the discharge port 111 is located above the gel coat film 630 to be processed; a hook 200, one end of which is connected to the upper end of the scraper 610 of the machine-made equipment, and the other end of which extends downward along the side wall of the scraper 610 and is connected to the first end of the flow guiding groove 110; an overlapping part 300, one end of which overlaps on the support base 620 of the machine-made equipment, and the overlapping part 300 is connected to the second end of the flow guiding groove 110 through a bevel 400; and the discharge port 500 of the machine-made equipment is located above the bevel 400. By setting a downward-recessed arc-shaped guide channel 110, the gel coat resin flows into the guide channel 110 along the inclined side 400 and then flows out through the bottom outlet 111. The kinetic energy of the vertical fall is buffered and dissipated by the slope, and the heavy filler in the gel coat resin no longer has the momentum to impact the film, thus completely eliminating dark wash streaks. Secondly, this device places the outlet 111 above the gel coat film, and the hook 200 is connected to the upper end of the scraper 610, and the overlap 300 is overlapped with the support base 620 to stabilize the device. When the gel coat liquid accumulates on the film, the outlet 111 is naturally submerged below the liquid surface. The new material is released from below the liquid surface, and the pigment powder floating on the surface is wrapped by the old material and will never be directly exposed to the film, realizing "encapsulation before contact", which fundamentally solves the color separation problem caused by floating color transfer. Furthermore, this device consists only of a guide section 100, a hook 200, and an overlapping section 300. It can be integrally formed from stainless steel plates, requires no additional power or control system, is easy to install, compatible with existing production lines, and has a low barrier to entry for promotion and application.
[0022] See Figure 1 Furthermore, in this embodiment, the distance between the discharge port 111 and the surface of the gelcoat film 630 is 5mm to 15mm. When the height of the accumulated gelcoat resin liquid on the film exceeds this distance, the discharge port 111 is submerged below the surface of the gelcoat resin liquid. Maintaining a safe distance during the initial material feeding stage prevents the device from scratching the film. When the gelcoat liquid accumulates beyond this distance, the discharge port 111 automatically submerges below the liquid surface, allowing the new material to directly enter the old material, thereby encapsulating the pigment powder floating on the surface of the new material within the old material, preventing the pigment powder from being directly transferred to the film, and fundamentally solving the color separation problem. Existing direct material feeding methods do not possess this dynamic immersion function.
[0023] See Figure 3 , Figure 3 This is a schematic diagram showing the distribution of the outlet 111 of a buffer guide feeding device for gel coat resin in an embodiment of this application. Furthermore, in this embodiment, the discharge ports 111 are multiple discharge ports 111 spaced apart along the bent portion at the bottom of the arc-shaped guide channel 110, arranged in a row. This row arrangement creates a neat "feeding line" along the film width direction, allowing new material to flow out simultaneously from the same transverse line, resulting in a concentrated and continuous discharge position. When the old material is propelled forward by the scraper 610, it can evenly wrap the entire strip of new material from the outside, forming a neat "skin-wrapped-filling" interface, avoiding incomplete wrapping or delamination due to misaligned discharge positions. The row arrangement ensures that the gel coat flows out from the bottom of the guide channel 110 along the shortest path, resulting in low flow resistance and reducing the likelihood of eddies or dead zones between the discharge ports 111. This promotes the uniform distribution of pigments and fillers, further reducing the risk of color separation.
[0024] Specifically, the length of the discharge port 111 is 30mm~50mm and the width is 4mm~8mm. The short side of the discharge port 111 is arc-shaped. Preferably, the discharge port 111 is 35mm long and 6mm wide. While ensuring sufficient flow area, this reduces turbulence and retention of gel coat at the edge of the orifice, preventing pigment or filler from clogging or accumulating at the orifice. The arc-shaped short side structure also reduces stress concentration and extends the service life of the device.
[0025] Preferably, the inclination angle of the inclined side 400 is adapted to the slope surface of the arc-shaped guide channel 110. This ensures that the gel coat resin flows from the discharge port 500 into the guide channel 110 through the inclined side 400 without steps or turns, forming a continuous and unobstructed flow path. This avoids eddies or splashes caused by sudden changes in flow, thereby reducing the risk of pigment mixing with air bubbles.
[0026] Furthermore, in this embodiment, the hook 200 is a J-shaped hook 200; the overlapping part 300 is an arc-shaped overlapping surface adapted to the support shaft 621 on the support base 620. The J-shaped hook 200 facilitates quick attachment and disassembly and adapts to the shape of the upper end of different scrapers 610; the overlapping part 300 can reliably cooperate with support shafts 621 of different diameters on the support base 620, improving the versatility and installation stability of the device, while reducing the requirements for modification of existing production lines.
[0027] See Figure 4 , Figure 4 This is a process flowchart of a method for feeding gelcoat resin according to an embodiment of this application. As shown in the figure, this embodiment provides a method for feeding gelcoat resin in a second aspect, including the following steps: S1: Based on actual processing requirements, manufacture the buffer flow guiding and feeding device as described in any one of claims 1 to 6; S2: Hook 200 onto the upper end of scraper 610, and overlap part 300 onto support base 620 or support shaft 621, so that gel coat feeding tool remains stationary relative to scraper 610 and support base 621; S3: Adjust the height of the feeding device so that the distance between the lowest point of its discharge port 111 and the surface of the gel coat film 630 is 5mm to 15mm; S4: Mix the gel coat resin and curing agent evenly, and continuously discharge the mixture from the discharge port 500 to the inclined side 400, and then flow into the arc-shaped guide groove 110 of the guide section 100 through the inclined side 400. S5: The gel coat resin flows downward along the arc-shaped guide groove 110. After being buffered by the guide groove 110, it flows out continuously from the outlet 111 at the bottom of the guide groove 110 and falls onto the film. Under the scraping action of the doctor blade 610, the gel coat resin forms a gel coat layer of the required thickness and width on the film and continues to form as the film moves forward.
[0028] Compared to existing direct gelcoat application processes, this method, by pre-setting the distance between the discharge port 111 and the film, utilizes the natural accumulation of gelcoat resin during production to automatically raise the liquid level, achieving passive immersion of the discharge port 111. New material is released from below the liquid surface, and the pigment powder floating on its surface is encapsulated by the old material, completely blocking the path of pigment transfer to the film. Simultaneously, the buffering effect of the arc-shaped guide channel 110 eliminates impact streaks on the film from heavy fillers. This method requires no additional sensors or actuators, boasts high reliability, can increase the yield to over 98%, significantly reduces scrap rate and production costs, and ensures long-term uniform color on the product surface.
[0029] See Figure 5 , Figure 5 This is a simplified dynamic diagram of the dynamic coating process in a gel coat resin feeding method according to an embodiment of this application.
[0030] Furthermore, in this embodiment, in step S5, when the height of the gel coat resin liquid already accumulated on the film exceeds the distance between the outlet 111 and the film surface, the outlet 111 is submerged below the gel coat resin liquid surface, and the newly fed gel coat resin directly enters the interior of the old gel coat resin to form a dynamic coating.
[0031] Specifically, the dynamic coating process is as follows: newly added gelcoat resin is coated from the outside by old gelcoat resin. Pigment that floats to the surface of the new gelcoat resin due to incompatible molecular forces is encapsulated inside, preventing direct contact between the floating pigment and the film. Simultaneously, pigment accumulation caused by heavy filler scouring is also encapsulated inside the gelcoat, preventing transfer to the film surface. Compared to existing technologies where new material directly falls onto the film, leading to pigment transfer, this application uses a preset spacing at the discharge port 111 to automatically trigger immersion after the liquid level rises. New material is released from within the old material, and the floating pigment and pigment accumulation caused by heavy filler scouring on its surface are tightly encapsulated from the outside by the old gelcoat, like "dumpling skin wrapping filling," completely blocking the contact path between the pigment and the film. This dynamic coating process requires no manual intervention, continuously sealing the floating pigment inside the gelcoat during production, fundamentally eliminating color separation and streaks, and ensuring uniform color on the product surface.
[0032] Furthermore, in this embodiment, the processing of the gel coat buffer drainage and unloading device described in S1 includes the following steps: carving the outline of the unloading hole on the stainless steel plate to be processed; drilling and hollowing out the carved stainless steel plate; bending the hollowed-out stainless steel plate to form a guide groove 110 and a bevel 400; welding the bent guide groove 110 and the bevel 400 to the hook 200 and the overlapping part 300 respectively to obtain the target unloading device. Compared with the complex machining or casting methods in the prior art, this processing method only uses conventional stainless steel plates and basic sheet metal processes, resulting in low manufacturing costs, short processing cycles, controllable precision, and suitability for rapid customization according to different product widths, possessing strong industrial practicality and scalability.
[0033] The beneficial effects of implementing this invention are as follows: This invention discloses a buffered flow guiding and feeding device for gelcoat resin. By setting a downwardly recessed arc-shaped guide channel, the gelcoat resin first flows into the guide channel along the inclined side and then flows out through the bottom outlet. The kinetic energy of the vertical fall is buffered and dissipated by the slope, and the heavy fillers in the gelcoat resin no longer have the momentum to impact the film, thus completely eliminating dark-colored scouring streaks. Secondly, this device positions the outlet above the film, and the hook is connected to the upper end of the scraper, and the overlapping part is connected to the support base, ensuring stable positioning. When gelcoat liquid accumulates on the film, the outlet naturally submerges below the liquid surface. New material is released from below the liquid surface, and the pigment powder floating on the surface is wrapped by the old material, never directly exposed to the film, achieving "encapsulation before contact," fundamentally solving the color separation problem caused by floating color transfer. Furthermore, this device consists only of a guide section, a hook, and an overlapping part, and can be integrally formed from stainless steel plates. It requires no additional power or control system, is easy to install, compatible with existing production lines, and has a low barrier to entry for widespread application.
[0034] This invention discloses a method for feeding gel coat resin. By pre-setting the distance between the discharge port and the film, the resin naturally accumulates during production, causing the liquid level to rise automatically, thus achieving passive immersion of the discharge port. New material is released from below the liquid surface, and the pigment powder floating on its surface is encapsulated by the old material, completely blocking the path of pigment transfer to the film. Simultaneously, the buffering effect of the arc-shaped guide channel eliminates impact streaks on the film from heavy fillers. This method requires no additional sensors or actuators, has high reliability, significantly reduces scrap rates and production costs, and ensures long-term uniform color on the product surface.
[0035] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.
Claims
1. A buffered flow guiding and feeding device for gelcoat resin, used for buffered flow guiding and feeding of gelcoat resin in a machine-molded gelcoat flat sheet production line, characterized in that, include: The flow guide section is provided with a downwardly recessed arc-shaped flow guide groove, and the bottom of the arc-shaped flow guide groove is provided with a discharge port; The discharge port is located above the gel coat film to be processed; A hook, one end of which is connected to the upper end of the scraper of the forming equipment, and the other end of which extends downward along the side wall of the scraper and is connected to the first end of the guide groove; The overlapping part has one end overlapping the support base of the machine forming equipment, and the overlapping part is connected to the second end of the guide groove through the inclined side; the material discharge port of the machine forming equipment is located above the inclined side.
2. The buffer and guide feeding device for gel coat resin according to claim 1, characterized in that, The distance between the discharge port and the surface of the gel coat film is 5mm to 15mm; When the height of the accumulated gel coat resin liquid on the film exceeds this distance, the outlet is submerged below the surface of the gel coat resin liquid.
3. The buffering and guiding feeding device for gel coat resin according to claim 1, characterized in that, The discharge ports are multiple discharge ports spaced apart along the bent portion at the bottom of the arc-shaped guide channel, and the multiple discharge ports are arranged in a row.
4. The buffer and guide feeding device for gel coat resin according to claim 3, characterized in that, The length of the discharge port is 30mm~50mm and the width is 4mm~8mm, and the short side of the discharge port is arc-shaped.
5. The buffer and guide feeding device for gel coat resin according to claim 1, characterized in that, The inclination angle of the inclined side is adapted to the slope surface of the arc-shaped guide channel.
6. The buffer and guide feeding device for gel coat resin according to claim 1, characterized in that, The hook is a J-shaped hook; The overlapping part is a flat plate or an arc-shaped overlapping surface adapted to the support shaft on the support base.
7. A method for feeding gel coat resin, characterized in that, Includes the following steps: S1: Based on actual processing requirements, manufacture the buffer flow guiding and feeding device as described in any one of claims 1 to 6; S2: Attach the hook to the upper end of the scraper and overlap the joint with the support base or support shaft to keep the gel coat feeding tool stationary relative to the scraper and support base; S3: Adjust the height of the feeding device so that the distance between the lowest point of its discharge port and the surface of the gel coat film is 5mm to 15mm; S4: Mix the gel coat resin and curing agent evenly, and continuously discharge the material from the discharge port to the inclined side, and then flow into the arc-shaped guide groove of the guide section through the inclined side; S5: The gel coat resin flows downward along the arc-shaped guide channel. After being buffered by the guide channel, it flows out continuously from the outlet at the bottom of the guide channel and falls onto the film. Under the scraping action of the doctor blade, the gel coat resin forms a gel coat layer of the required thickness and width on the film and continues to form as the film moves forward.
8. The method for feeding gel coat resin according to claim 7, characterized in that, In step S5, when the height of the accumulated gel coat resin liquid on the film exceeds the distance between the outlet and the film surface, the outlet is submerged below the gel coat resin liquid surface, and the newly added gel coat resin directly enters the interior of the old gel coat resin, forming a dynamic coating.
9. The method for feeding gel coat resin according to claim 8, characterized in that, The dynamic wrapping process is as follows: The newly added gel coat resin is coated from the outside by the old gel coat resin. The color powder that floats out on the surface of the new gel coat resin due to the incompatibility and repulsion between molecules is wrapped inside, preventing the floating color from directly contacting the film. Meanwhile, the pigment accumulation caused by the heavy filler scouring is also encapsulated inside the gel coat resin and does not transfer to the film surface.
10. The method according to claim 7, characterized in that, The process of producing the gel coat buffer drainage and feeding device described in S1 includes the following steps: The outline of the feed hole is engraved on the stainless steel plate to be processed; Drill holes in the carved stainless steel plate; The hollowed-out stainless steel plate is bent to form a guide channel and a beveled edge; The bent and shaped guide channel and the bevel are welded to the hook and the overlapping part respectively to form the target feeding device.