On-line pultrusion in-mold paint injection forming mold

Abstract

The invention discloses an online pultrusion in-mold paint injection forming mold, belongs to the technical field of molds, and realizes synchronous in-mold paint injection in the pultrusion process, improves the production efficiency and the product painting quality, reduces the production cost and shortens the production period. The whole structure comprises an upper mold body, a lower mold body, a front mold body, a rear mold body, a high-temperature gasket, a sealing ring, a heat insulation plate, a paint injection channel, a paint injection system, a vacuum system, a heating system, a cooling system and a heat preservation system, the upper mold body is connected with the lower mold body, and the front mold body and the rear mold body are arranged on the front side and the rear side of the upper mold body and the lower mold body correspondingly; the sealing ring is located between the upper mold body and the lower mold body, the heat insulation plate is tightly attached to the periphery of the whole mold, and therefore the influence of the environment temperature on the mold is reduced; the paint injection channel is located in the position, close to the inlet end, of the lower mold body; the paint injection system is connected with the paint injection channel, and the vacuum system is located in the position, close to the outlet end, of the upper mold body; the heating system is located at the front one third of the die, and the heat preservation system is located in the middle of the die. According to the invention, in-mold paint injection can be synchronously realized in the pultrusion process, and the device has the advantages of improving the production efficiency, improving the product painting quality and performance, reducing the production cost and shortening the production period, thereby effectively solving the problems proposed in the background technology.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and in particular to an online pultrusion in-mold paint injection molding die. Background Technology

[0002] Pultrusion, as one of the core technologies in composite material manufacturing, has rapidly emerged in recent years amidst the global wave of industrial upgrading and green transformation. Its application is not only driven by the limitations of traditional material properties but also closely related to industry transformation under the trends of digitalization and low-carbonization. In-mold pultrusion (IMP) technology is a cutting-edge exploration in the field of composite material manufacturing in recent years. It aims to combine the efficient continuous production of PEP with the surface treatment process of IMP, achieving weight reduction in composite material products through material lightweighting, process integration, and structural optimization, while simultaneously ensuring surface performance and production efficiency. With the development of low-cost fibers and intelligent coating technologies, this technology has become one of the core competitive advantages in lightweight solutions for transportation, new energy, and other fields.

[0003] Composite products manufactured using online pultrusion molding technology have advantages such as high efficiency, high strength, high dimensional stability, high material utilization, and stable product quality. They have been widely used in fields with lightweight requirements, such as automobiles, rail transportation, power equipment, and construction.

[0004] In the pultrusion process, the molded products typically require painting to improve their appearance, corrosion resistance, and other properties. Traditional painting methods often involve manual or offline painting after pultrusion, which is not only inefficient but also makes it difficult to guarantee uniform and consistent paint quality, easily leading to problems such as missed areas and runs. Furthermore, offline painting requires additional equipment and space, increasing production costs and time.

[0005] With the continuous development of technology, the requirements for the production efficiency and quality of pultruded products are getting higher and higher. Therefore, developing an online molding die that can realize in-mold painting during the pultrusion process has important practical significance. Summary of the Invention

[0006] 1. Purpose of the invention: The purpose of this invention is to provide an online pultrusion in-mold paint injection molding die that can simultaneously achieve in-mold paint injection during the pultrusion process, thereby improving production efficiency and product paint quality, and reducing production costs and production cycle.

[0007] 2. Technical Solution:

[0008] Overall mold structure: This online pultrusion in-mold injection molding mold mainly consists of an upper mold body, a lower mold body, a front mold body, and a rear mold body. The upper and lower mold bodies cooperate to form the molding cavity for pultruded products. A sealing ring is installed between the upper and lower mold bodies, and high-temperature gaskets are installed between the front and rear mold bodies to form a sealed space within the mold cavity. The upper mold body, lower mold body, front mold body, and rear mold body are all made of high-strength, high-temperature resistant P20 mold steel to ensure the mold's service life and stability.

[0009] Paint Injection: A paint injection channel and a vacuum device are installed inside the mold. The paint injection channel is connected to an external paint injection system, and the paint enters the mold through the channel. The vacuum device creates a vacuum seal inside the mold, allowing the paint to be evenly distributed to the inner surface of the molding cavity, thereby forming a uniform paint layer on the surface of the pultruded product.

[0010] Heating and Cooling Systems: The mold is equipped with both heating and cooling devices. The heating device heats the mold during the pultrusion process, allowing the paint to quickly solidify on the product surface. The heating device uses water heating, and the mold's heating temperature is precisely controlled by a temperature control system. The cooling device is located at the mold's discharge end and is used to cool the pultruded and painted product, allowing it to quickly set. The cooling device also uses water cooling. An insulation system separates the heating and cooling systems to prevent direct contact between heating and cooling, which could affect product quality. The insulation system uses water temperature control.

[0011] Traction device: A traction device is installed at the exit end of the mold to pull the painted pultruded product out of the mold's forming cavity. The traction device adopts a motor-driven cylinder module form, and the stability of the pultrusion painting process is ensured by precisely controlling the traction speed.

[0012] 3. Beneficial effects:

[0013] Improved production efficiency: By using an online pultrusion in-mold painting die, pultrusion and painting are performed simultaneously, significantly shortening the production cycle and increasing production efficiency. Compared to traditional offline painting methods, production efficiency can be increased several times or even dozens of times.

[0014] Improved coating quality: Since the paint is evenly distributed to the inner surface of the molding cavity inside the mold, a uniform and dense paint layer can be formed on the product surface, effectively avoiding problems such as missed coating and dripping, thus improving the coating quality and appearance of the product.

[0015] Reduced production costs: It reduces the additional equipment and space required for offline painting, while improving production efficiency, reducing labor costs and energy consumption, thereby reducing overall production costs.

[0016] Enhanced product performance: Simultaneous coating during pultrusion results in a tighter bond between the paint layer and the product substrate, effectively improving the product's corrosion resistance, abrasion resistance, and other properties, and extending the product's service life. Attached Figure Description

[0017] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0018] Figure 1 This is a longitudinal sectional view of an online pultrusion in-mold paint injection molding die according to the present invention.

[0019] Figure 2 This is a cross-sectional schematic diagram of an online pultrusion in-mold paint injection molding die according to the present invention.

[0020] Figure 3 This is a cross-sectional view of a product according to the present invention.

[0021] In the diagram: Upper mold body 101, Lower mold body 102, Front mold body 103, Rear mold body 104, Paint injection channel 105, Paint injection system 106, Vacuum system 107, High-temperature sealing gaskets 108 and 109, Sealing ring 110, Pultruded profile 111, Heat insulation board 112, Temperature control system quick interface 113, Vacuum system quick interface 114, Paint film 115, Cooling system 201-210, Insulation system 301-308, Heating system 401-410. Detailed Implementation

[0022] Mold Installation and Debugging: Install the mold on the dedicated tooling, ensuring it is securely installed and accurately positioned. Connect the paint injection system to the external paint supply equipment, checking for tight connections and leaks. Check that the vacuum system is functioning properly, ensuring the mold cavity can form a vacuum seal. Debug the heating and cooling devices, ensuring they are working correctly, and set appropriate heating and cooling parameters according to product requirements. Debug the traction and positioning devices, ensuring they operate accurately.

[0023] Production Process: The traction and paint supply equipment are started to pull the pultruded profile into the forming cavity of the mold. Simultaneously, paint enters the mold through the paint injection channel and is evenly coated on the inner surface of the forming cavity. During the pultrusion painting process, the heating device heats the mold, causing the paint to quickly solidify on the product surface. The painted product is cooled by a cooling device and then output from the mold's outlet.

[0024] Quality Control: During production, the dimensional accuracy and coating quality of pultruded products are regularly inspected. The stability and consistency of product quality are ensured by adjusting parameters such as traction speed, heating temperature, and paint flow rate. If dimensional deviations or uneven coating are found, the machine is stopped immediately for adjustment and repair.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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.

[0026] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0027] Please refer to Figure 1 , Figure 2 , Figure 3 As shown, an online pultrusion in-mold paint injection molding die includes: an upper die body 101, a lower die body 102, a front die body 103, a rear die body 104, a paint injection channel 105, a paint injection system 106, a vacuum system 107, high-temperature sealing gaskets 108 and 109, a sealing ring 110, a heat insulation plate 112, a temperature control system quick interface 113, a vacuum system quick interface 114, a cooling system 201-210, a heat preservation system 301-308, and a heating system 401-410. The upper die body 101 and the lower die body 102 are connected. The front die body 103 and the rear die body 104 are located on the front and rear sides of the upper die body 101 and the lower die body 102, respectively. The high-temperature sealing gasket 108 is located on the front die body 104. At the connection between the 3rd and rear mold body 104 and the mold, the sealing ring 110 is located between the upper mold body and the lower mold body. The heat insulation plate 112 is closely attached to the entire mold to reduce the influence of ambient temperature on the mold. The paint injection channel 105 is located near the inlet end of the lower mold body 102. The paint injection system 106 is connected to the paint injection channel 105. The vacuum system 107 is located near the outlet end of the upper mold body 101. The heating system 401-410 is located in the front third of the mold. The heat preservation system 301-308 is located in the middle of the mold. The cooling system 201-210 is located in the rear third of the mold. The heating system, heat preservation system, and cooling system are all connected by the temperature control system quick interface 113. The exterior of the pultruded profile 111 is the paint film 115.

[0028] Specific implementation steps:

[0029] Install the mold on the specialized tooling, ensuring it is securely mounted and accurately positioned. Connect the paint injection channel to the external paint supply equipment, checking for tight connections and leaks. Test the heating and cooling devices to ensure they are functioning correctly, setting appropriate heating and cooling parameters according to product requirements. Test the traction and positioning devices to ensure they operate accurately.

[0030] The traction and paint supply equipment are activated to pull the pultruded profile into the molding cavity of the mold. Simultaneously, paint enters the mold through the paint injection channel and evenly coats the inner surface of the molding cavity. During the pultrusion process, the heating device heats the mold, causing the paint to quickly solidify on the product surface. The pultruded and painted product is cooled by a cooling device and then output from the discharge end of the mold. Using an in-mold injection molding die for pultruded profiles offers advantages such as low manufacturing cost, short molding time, high manufacturing efficiency, effective control of the entire molding process, and compliance with the requirements for continuous and mass production of composite materials.

[0031] 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 changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An in-line pultrusion in-mold paint injection molding die, characterized in that, The mold mainly consists of an upper mold body, a lower mold body, a front mold body, a rear mold body, a high-temperature gasket, a sealing ring, a heat insulation plate, a paint injection channel, a paint injection system, a vacuum system, a heating system, a cooling system, and a heat preservation system.

2. The online pultrusion in-mold paint injection molding die according to claim 1, characterized in that, The upper mold body is connected to the lower mold body, and a sealing strip is installed between the upper mold body and the lower mold body. The heating system is located in the front third of the upper mold body and the lower mold body, the heat preservation system is located in the middle of the upper mold body and the lower mold body, and the cooling system is located in the rear third of the upper mold body and the lower mold body. The temperature is controlled by the water circuit, which is connected to an external water temperature controller.

3. The online pultrusion in-die painting molding die according to claim 1, characterized in that, A sealing ring is installed between the upper mold body and the lower mold body, and high-temperature sealing gaskets are installed on the front mold body and the rear mold body. These are then connected to the front and rear sides of the upper mold body and the lower mold body respectively. Heat insulation plates are installed around the outer perimeter of the entire mold.

4. The online pultrusion in-die painting molding die according to claim 1, characterized in that, The mold vacuum system consists of an air nozzle, vacuum pipeline, vacuum control valve, and vacuum gauge. The air nozzle is connected to the upper mold body and is connected to the vacuum control valve through the gas pipeline.

5. The online pultrusion in-die painting molding die according to claim 1, characterized in that, The paint injection channel is connected to the lower mold body, and a quick connector is installed at the lower end of the paint injection channel to connect to the paint injection system.

Images