A paper pulp molding product production processing equipment, assembly line and hot press

Abstract

The application discloses a paper pulp molding product production processing equipment, a production line and a hot press, and relates to the technical field of paper pulp molding products. The application discloses a paper pulp molding product production processing equipment, a production line and a hot press, and relates to the technical field of paper pulp molding products. The application discloses a paper pulp molding product production processing equipment, a production line and a hot press, and relates to the technical field of paper pulp molding products. The application discloses a paper pulp molding product production processing equipment, a production line and a hot press, and relates to the technical field of paper pulp molding products. The application discloses a paper pulp molding product production processing equipment, a production line and a hot press, and relates to the technical field of paper pulp molding products. The application discloses a paper pulp molding product production processing equipment, a production line and a hot press, and relates to the technical field of paper pulp molding products. The application discloses a paper pulp molding product production processing equipment, a production line and a hot press, and relates to the technical field of paper pulp molding products. The application discloses a paper pulp molding product production processing equipment, a production line and a hot press, and relates to the technical field of paper pulp molding products. The application discloses a paper pulp molding product production processing equipment, a production line and a hot press, and relates to the technical field of paper pulp molding products. The application discloses a paper pulp molding product

Description

Technical Field

[0001] This application relates to the field of pulp molding manufacturing, and in particular to a production and processing equipment, production line and hot press for pulp molded products. Background Technology

[0002] The current production line process for pulp molding products typically uses an external heating device under normal pressure. The mold is heated first, and then the heat absorbed by the mold is transferred to the wet blank between the upper and lower molds through heat conduction. Finally, the moisture in the wet blank is heated and vaporized, thereby achieving the purpose of drying the wet blank. Utility Model Content

[0003] In existing technologies, to improve production efficiency, molds are often multi-cavity molds (such as 16-cavity, 20-cavity, or more), and the thicker the product, the longer the heating time for the wet blank. Because the forming and trimming times are relatively short, to balance the overall production line cycle time, it is often necessary to increase the number of hot pressing stations; currently, one forming operation is often paired with two hot pressing operations. This additional hot pressing station not only increases the overall cost of the equipment but also increases the length and floor space of the production line. Furthermore, the energy required to dry the wet blank during subsequent production processes also increases.

[0004] In addition, existing equipment typically requires more than 40 seconds to prepare finished products; it also consumes a large amount of steam, usually 6 to 8 tons; and the yield rate of the finished products manufactured by the equipment is low, only 85 to 88%, or even lower.

[0005] In order to solve the problems existing in the prior art, this application provides a method and equipment for the production and processing of pulp molded products, an assembly line and a hot press.

[0006] The specific technical solution of this application is as follows: A method for producing molded pulp products, the method comprising the following steps: The pulp is absorbed onto a forming mold and filtered to obtain a wet blank. The wet blank is transferred to a hot press mold and hot pressed to obtain a dry blank; The excess material at the edges of the dried blank is removed to obtain the finished product; Separate finished products from scrap materials; When a hot pressing die is used to hot press a wet blank, the entire wet blank is placed in a vacuum chamber. Preferably, when the hot pressing mold hot presses the wet blank, both the wet blank and the hot pressing mold are in a vacuum chamber.

[0007] In one specific embodiment, high-temperature steam is used for heating when hot pressing the wet blank.

[0008] In one specific embodiment, the vacuum degree of the vacuum chamber is -0.01 to -0.09 MPa; preferably, the vacuum degree of the vacuum chamber is -0.01 to -0.08 MPa.

[0009] This application also provides a production and processing equipment for pulp molded products, including a molding machine, a hot press, and an edge trimming machine. The molding machine is used to adsorb pulp to prepare a wet blank, the hot press can hot press the wet blank to obtain a dry blank, and the edge trimming machine is used to remove the edge material of the dry blank. Before and during hot pressing, the wet blank is kept in a vacuum environment.

[0010] In one embodiment, the device includes a sealed chamber, the hot press is disposed in the sealed chamber, and a vacuum pump is connected to the sealed chamber, the vacuum pump being capable of evacuating the interior of the sealed chamber.

[0011] In one specific embodiment, the forming machine, the hot press, and the trimming machine are connected in sequence, and a buffer chamber is provided between the hot press and the trimming machine, and the buffer chamber is connected to the sealing chamber.

[0012] In one specific embodiment, the buffer chamber is connected to the edge trimming machine, and the dry blank can enter the edge trimming machine through the buffer chamber.

[0013] In one specific embodiment, the hot press is equipped with a mold vacuum pump for extracting water vapor from the wet blank.

[0014] This application also provides a production line for manufacturing molded pulp products, including a molding machine, a hot press, and an edge trimming machine. The molding machine is used to adsorb pulp to prepare a wet blank, the hot press can hot press the wet blank to obtain a dry blank, and the edge trimming machine is used to remove the edge material of the dry blank. The hot press is equipped with a mold vacuum pump for extracting water vapor from the wet blank. The equipment production line includes a sealed tank, and the molding machine and hot press are installed in the sealed tank.

[0015] In one specific embodiment, the sealed container is in a sealed state, and a vacuum pump is connected to the sealed container, which is capable of evacuating the inside of the sealed container.

[0016] In one specific embodiment, a buffer chamber is connected to the sealed container; the buffer chamber is connected to the sealed container.

[0017] In one specific embodiment, the sealed container may be a vertical container, a horizontal container, or a square container.

[0018] In one specific embodiment, a reciprocating movable table is provided in the sealed tank, and the molding machine and / or hot press and / or trimming machine are arranged on the movable table.

[0019] This application provides a hot press for molding pulp products, which is used to hot press wet blanks to obtain dry blanks; characterized in that the hot press includes an upper mold and a lower mold for pressing the wet blanks, a closing member is provided on the hot press, the closing member is hollow to form a cavity, the upper mold and the lower mold are both disposed in the cavity inside the closing member, and a vacuum pump is connected to the closing member, the vacuum pump being connected to the cavity of the closing member.

[0020] In one specific embodiment, the upper mold is capable of reciprocating movement; the closure includes an upper seal and a lower seal, the upper seal is connected to the upper mold, and the upper seal is capable of reciprocating movement with the upper mold, and the lower seal is connected to the lower mold.

[0021] In one specific embodiment, the upper seal and the lower seal can be closed together, and the upper seal and the lower seal can seal when closed.

[0022] In one specific embodiment, a vacuum buffer tank is provided between the closure and the vacuum pump; the vacuum buffer tank is connected to the vacuum pump and to the chamber of the closure.

[0023] Beneficial effects The production and processing equipment, assembly line, and hot press for pulp molded products disclosed in this application achieve the following effects: 1. Reduced energy consumption and cost savings: This technical solution places the pulp molding equipment in a sealed tank and achieves vacuum operation conditions inside the tank through a vacuum pump. The molecular density inside the system is reduced, which not only reduces the collision frequency between gas molecules and reduces heat convection loss caused by molecular motion, but also reduces the saturated vapor pressure of water, further reducing energy consumption.

[0024] 2. Improve production efficiency and enhance product quality: The vacuum operating environment provided by this technical solution lowers the boiling point of water, increases the temperature difference between the heating plate and the product, accelerates the evaporation rate of water vapor, greatly reduces the hot pressing time, and increases the hot pressing frequency. The hot pressing process is reduced from 40-45 seconds to less than 22 seconds, which is equivalent to reducing one hot pressing station, reducing equipment costs, saving equipment floor space, and also avoiding product carbonization caused by excessive hot pressing time.

[0025] 3. Improved working environment. Under this technical solution, the internal temperature of the tank system is reduced, and external insulation measures are adopted, which not only saves energy consumption, but also reduces the diffusion of heat to the surrounding environment, resulting in a lower workshop temperature and a better working environment.

[0026] 4. Extend equipment maintenance cycle and reduce equipment maintenance costs. This technical solution reduces the temperature of the hot pressing station equipment and the surrounding environment, which not only increases the equipment's service life but also improves its operational stability.

[0027] 5. When installing the molding machine, hot press, and trimming machine in the sealed tank using the mobile platform, simply hoist these machines onto the platform and then transport them into the sealed tank, facilitating the installation process. Furthermore, during maintenance, the molding machine, hot press, and trimming machine can be moved horizontally out of the sealed tank using the mobile platform, avoiding operation in the limited space inside the sealed tank, thus providing a larger maintenance space and better operability. Attached Figure Description

[0028] Figure 1 This is a front view of the molding equipment in Embodiment 1 of this application; Figure 1a This is a structural diagram of the mobile station in this application; Figure 2 This is a top view of the molding equipment in Embodiment 1 of this application; Figure 3 This is a three-dimensional diagram of the molding equipment in Embodiment 2 of this application; Figure 4 This is another perspective view of the molding equipment in Embodiment 2 of this application; Figure 5 This is a structural diagram of the molding equipment in Embodiment 3 of this application; Figure 6 This is a device connection diagram in Embodiment 3 of this application.

[0029] In the diagram, 1 is the molding machine; 2 is the hot press; 3 is the trimming machine; 4 is the sealing tank; 41 is the moving table; 5 is the sealing chamber; 6 is the buffer chamber; 7 is the upper mold; 8 is the upper seal; 9 is the lower mold; 10 is the lower seal; and 11 is the buffer tank. Detailed Implementation

[0030] The present application will now be described in detail. While specific embodiments of the present application are shown, it should be understood that the present application can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0031] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions in the specification are preferred embodiments for carrying out this application; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of this application. The scope of protection of this application shall be determined by the appended claims.

[0032] refer to Figure 1 and Figure 2 This application provides a method for producing molded pulp articles, wherein the method includes the following steps: The pulp is absorbed onto a forming mold and filtered to obtain a wet blank. The wet blank is transferred to a hot press mold and hot pressed to obtain a dry blank; The excess material at the edges of the dried blank is removed to obtain the finished product; Separate finished products from scrap materials; When a hot pressing die is used to hot press a wet blank, the entire wet blank is placed in a vacuum chamber. The hot press mold is equipped with a mold vacuum pump. When the hot press mold is used to hot press the wet blank, the mold vacuum pump is used to extract the water vapor that evaporates from the wet blank. This reduces the water vapor content around the wet blank and accelerates the evaporation of moisture in the wet blank.

[0033] A vacuum chamber refers to an environment where the hot pressing process takes place under vacuum. This environment remains continuously under vacuum with a high degree of vacuum. Most of the water vapor evaporated from the wet blank is drawn away by the mold vacuum pump through small holes in the hot pressing mold, while a small portion diffuses into the vacuum chamber. Although this reduces the vacuum level, the environment remains sealed until the hot pressing process is complete.

[0034] Because the wet blank is in a vacuum environment during hot pressing, the boiling point of the moisture in the wet blank decreases when heated. Therefore, when the moisture in the wet blank is heated to below 100°C, it will boil and evaporate. Most of it will be sucked away by the mold vacuum pump through the small holes in the hot pressing mold. A small portion of the vaporized water will diffuse into the vacuum chamber. Although this will correspondingly reduce the vacuum level of the vacuum chamber, the amount of leaked water vapor is small, and the impact on the vacuum chamber is minimal. The moisture in the wet blank continues to evaporate, and the drying process is completed before the vacuum level in the vacuum chamber drops drastically to a certain level. This effectively shortens the hot pressing process time.

[0035] In the vacuum chamber, the water vapor produced by the boiling and evaporation of moisture in the wet blank is kept within the vacuum chamber due to the vacuum environment. This vapor then further heats the wet blank. This not only reduces the waste of heat from the water vapor but also reduces heat waste during the hot pressing process, thereby lowering processing costs.

[0036] It is also worth noting that since thermal convection essentially disappears in a vacuum, heat dissipation is greatly reduced. Therefore, when a wet blank is heated in a vacuum environment, the heat used to heat the wet blank is simultaneously concentrated in the vacuum chamber. This not only keeps the wet blank warm but also reduces heat waste during the hot pressing process, thereby lowering processing costs.

[0037] Preferably, when the hot pressing mold hot presses the wet blank, both the wet blank and the hot pressing mold are in a vacuum chamber.

[0038] During hot pressing, the hot pressing mold comes into contact with the wet blank, and the wet blank absorbs heat from the hot pressing mold. This heat is then conducted away as the hot pressing mold comes into contact with the wet blank, resulting in heat loss. Therefore, the hot pressing mold is placed in a vacuum chamber at the same time to further reduce heat loss and waste.

[0039] When hot pressing the wet blank, high-temperature steam is used for heating.

[0040] The vacuum degree of the vacuum chamber is -0.01 to -0.09 MPa; preferably, the vacuum degree of the vacuum chamber is -0.01 to -0.08 MPa.

[0041] Specifically, the vacuum degree of the vacuum chamber can be: -0.001MPa, -0.002MPa, -0.003MPa, -0.004MPa, -0.005MPa, -0.006MPa, -0.007MPa, -0.008MPa, -0.009MPa, -0.01MPa, -0.012MPa, -0.014MPa, -0.005MPa, -0.006MPa, -0.007MPa, -0.008MPa, -0.009MPa, -0.001 ... .016MPa, -0.018MPa, -0.02MPa, -0.022MPa, -0.024MPa, -0.026MPa, -0.028MPa, -0 .03MPa, -0.032MPa, -0.034MPa, -0.036MPa, -0.038MPa, -0.04MPa, -0.042MPa, -0.0 44MPa, -0.046MPa, -0.048MPa, -0.05MPa, -0.052MPa, -0.054MPa, -0.056MPa, -0.0 58MPa, -0.06MPa, -0.062MPa, -0.064MPa, -0.066MPa, -0.068MPa, -0.07MPa, -0.072 MPa, -0.074MPa, -0.076MPa, -0.078MPa, -0.08MPa, -0.082MPa, -0.084MPa, -0.086M Pa, -0.088MPa, -0.09MPa, -0.092MPa, -0.094MPa, -0.096MPa, -0.098MPa, -0.1MPa.

[0042] This application also provides a production and processing equipment for pulp molded products, including a molding machine, a hot press, and an edge trimming machine. The molding machine is used to adsorb pulp to prepare a wet blank, the hot press can hot press the wet blank to obtain a dry blank, and the edge trimming machine is used to remove the edge material of the dry blank. When the hot press is used to hot press the wet blank, the wet blank is in a vacuum environment.

[0043] When the wet blank is in a vacuum environment, the boiling point of the water contained in the wet blank will decrease accordingly, making it easier for the water in the wet blank to evaporate. As a result, the hot press can complete the hot pressing process of the wet blank more quickly. On the one hand, it speeds up the hot pressing and drying speed of the wet blank, and on the other hand, it reduces the heating and hot pressing time of the wet blank, which can reduce one hot pressing station and thus reduce the cost of the hot pressing process.

[0044] Furthermore, in the hot pressing process, the purpose of hot pressing the wet blank is to accelerate its drying. Rapidly dried wet blanks exhibit superior surface properties, and the dried blanks possess better physical structural properties. Therefore, by placing the wet blank in a vacuum environment, heat loss within the vacuum environment is reduced, and the boiling point of the moisture in the wet blank is lowered, thereby accelerating the hot pressing speed and ultimately obtaining a dried blank with better properties.

[0045] refer to Figure 1 and Figure 2 In one specific embodiment, the equipment includes a sealed tank, a molding machine, a hot press, and a trimming machine, wherein the molding machine and the hot press are disposed in the sealed tank.

[0046] The sealed container is in a sealed state, and a vacuum pump is connected to the sealed container. The vacuum pump can evacuate the inside of the sealed container. A vacuum pump evacuates the sealed container, creating a vacuum space inside, which in turn creates a vacuum environment for the hot press located within the container. Since the forming machine and hot press are located inside the sealed container, the heat generated and utilized by these machines is retained within the container. This allows the temperature inside the sealed container to continuously heat the wet blank, reducing heat loss and lowering processing costs; it also shortens the hot pressing time for the wet blank, improving processing efficiency.

[0047] A buffer chamber is connected to the sealed container; the buffer chamber is connected to the sealed container.

[0048] The buffer chamber is used to remove the produced pulp molding products and maintain the negative pressure vacuum state in the sealed container. This reduces the possibility of the vacuum environment in the sealed container being disrupted, thus allowing the negative pressure vacuum state to be maintained for a longer period, reducing the frequency of use of the vacuum machine, and consequently reducing processing costs.

[0049] The sealed container may be in the form of a vertical container, a horizontal container, or a square container, etc., including but not limited to these.

[0050] A reciprocating moving table 41 is provided in the sealed tank 4, and the forming machine 1 and / or hot press 2 and / or trimming machine 3 are arranged on the moving table 41.

[0051] In one specific implementation, reference is made to Figure 1a As shown; the molding machine 1, the hot press 2, and the trimming machine 3 are all mounted on the moving table 41, or any of the equipment or the equipment that is more prone to failure during use can be installed on the moving table 41.

[0052] The molding machine 1, hot press 2, or slicer can be moved out of the sealed container 4 using the moving platform 41. Because the dimensions of the sealed container 4 are compatible with the dimensions of the molding machine 1, hot press 2, and trimming machine 3, and the spacing between them is small, the limited space in the sealed container 4 makes installation or repair difficult. Therefore, the moving platform 41 allows the molding machine 1, hot press 2, or slicer to be moved out of the sealed container 4 for installation or repair, making the installation and repair of the molding machine 1, hot press 2, or slicer more convenient and faster.

[0053] Reference 3 and Figure 4 In one specific embodiment, the device includes a sealed chamber, the hot press is disposed in the sealed chamber, and a vacuum pump is connected to the sealed chamber, the vacuum pump being capable of evacuating the interior of the sealed chamber.

[0054] The sealed chamber encloses the hot press. Furthermore, a forming machine and the hot press are housed inside the sealed chamber, and a vacuum pump evacuates the chamber, ensuring that the hot press and the wet blank being hot-pressed are completely within the vacuum environment of the sealed chamber.

[0055] The vacuum environment within the sealed chamber accelerates the hot pressing process of the wet blank. Furthermore, because the forming machine and hot press are located within the sealed chamber, its internal dimensions are smaller. Consequently, the operating power and intensity of the vacuum pump are reduced, making vacuum maintenance more convenient and ensuring a better seal. The manufacturing and construction costs of the sealed chamber are also significantly reduced.

[0056] The forming machine, hot press, and trimming machine are connected in sequence. A buffer chamber is provided between the hot press and the trimming machine, and the buffer chamber is connected to the sealing chamber.

[0057] The buffer chamber is connected to the edge trimming machine, and the dry blank can enter the edge trimming machine through the buffer chamber.

[0058] Similarly, the buffer chamber here is used to remove the produced pulp molding products and to maintain the negative pressure vacuum state in the sealed chamber.

[0059] Reference 5 and Figure 6 In one specific embodiment, the hot press includes an upper mold and a lower mold for pressing wet blanks. A closure is provided on the hot press, and the closure is hollow to form a cavity. The upper mold and the lower mold are both disposed in the cavity inside the closure. A vacuum pump is connected to the closure and the vacuum pump is connected to the cavity of the closure.

[0060] The upper mold is capable of reciprocating movement; the closure includes an upper seal and a lower seal, the upper seal is connected to the upper mold and is capable of reciprocating movement with the upper mold, and the lower seal is connected to the lower mold.

[0061] The upper seal and the lower seal can close together, and the upper seal and the lower seal can seal when closed.

[0062] The upper seal can reciprocate with the upper mold, or the lower seal can reciprocate with the lower mold. The upper and lower seals can close to form a completely sealed chamber, which is then evacuated by a vacuum pump. The upper and lower molds, as well as the wet blank, are all located within this vacuum chamber. The wet blank is then hot-pressed in a vacuum environment.

[0063] A vacuum buffer tank 11 is provided between the closure and the vacuum pump; the vacuum buffer tank 11 is connected to the vacuum pump and to the chamber of the closure. After the upper and lower seals are closed, the vacuum buffer tank 11 directly connects to the chamber in the closure, and can quickly evacuate the chamber to a vacuum state. Compared to the evacuation speed of the vacuum pump, the evacuation speed of the vacuum buffer tank 11 is significantly improved. This shortens the evacuation speed of the chamber in the closure and accelerates the drying and hot pressing speed of the wet blank, further increasing the hot pressing efficiency.

[0064] Example The pulp molding production and processing equipment provided in this application consists of an outer shell system, a molding system (molding machine), a hot pressing system (hot press), a buffer chamber, a trimming system (trimming machine), a feeding system, a product transfer mechanism, and an auxiliary supply system.

[0065] The outer casing system consists of four parts: a base, a cylindrical body, a top end cap, and a sealing door. The base supports and houses other equipment systems. The cylindrical body seals the perimeter of the equipment and contains observation mirrors and various monitoring instruments. The top end cap seals the top of the equipment and also contains observation mirrors and monitoring instruments. The top end cap is detachable; after other systems are hoisted and installed, it is sealed and secured, facilitating future equipment maintenance and replacement of old equipment with new. The cylindrical body is equipped with a sealing door for personnel access during maintenance and repairs.

[0066] The forming system consists of a frame, pulp tank, upper forming die, lower suction forming die, forming power mechanism, die cleaning system, vacuum system, and air compressor system. The external pulping system injects pulp mixed in a specific ratio into the pulp tank. After the die cleaning system cleans the suction forming die, the forming power mechanism immerses the lower suction forming die in the pulp tank. The vacuum system adsorbs the pulp in the tank at a set time. As the pulp passes through the filter screen, the single-fiber pulp settles layer by layer and remains on the screen, forming a wet blank. The thickness of the wet blank is controlled by the set suction time. Finally, driven by the power mechanism, the suction forming die and the wet blank rise synchronously until they are completely removed from the pulp tank.

[0067] The hot pressing system consists of a frame, a mold-closing power mechanism (servo press or hydraulic), upper and lower mold tables, upper and lower hot pressing molds, and a heating system. After the wet blank transfer mechanism moves above the wet blank, a vertical mechanism lowers the wet blank until it contacts the upper mold, applying pressure. Under this external pressure, the wet blank undergoes a first dehydration, resulting in a moisture content between 65% and 75%. At this point, the upper transfer membrane opens with negative pressure to adsorb the wet blank, while compressed gas is introduced through the lower transfer membrane to backflush the wet blank from below. Combined with the negative pressure adsorption of the upper transfer membrane, the wet blank is transferred to the upper transfer membrane. The transfer mechanism then transfers the wet blank to the lower hot pressing mold at the hot pressing station. The mold-closing power mechanism lifts the lower hot pressing mold to close it with the upper hot pressing mold, maintaining pressure for a certain time (if the lower hot pressing mold is fixed, the upper hot pressing mold descends to close with it). At this point, the heating system heats the upper and lower hot pressing molds (heating methods include electric heating, heat transfer oil heating, and steam heating, etc., which are not limited here). The heat from the molds is transferred to the wet blank inside the upper and lower hot pressing molds through heat conduction, causing the moisture inside the blank to be rapidly heated and vaporized. The water vapor is then extracted through the air holes in the upper and lower heating molds, completing the hot pressing, drying, and shaping of the wet blank. The moisture content of the dried blank is controlled by controlling the temperature of the hot pressing molds and the length of the holding time, and the holding time varies for products of different thicknesses (if the mold temperature is the same).

[0068] Trimming: Driven by the power system, the blank transfer mold on the product transfer mechanism removes the formed blank from the thermoforming mold, and then transfers the blank to the trimming mold at the trimming station. Driven by the trimming machine's mold closing power mechanism, the upper and lower molds close to complete the trimming of the excess part of the blank.

[0069] Buffer Chamber: The buffer chamber is connected to the rear of the outer shell (a tank that ensures the entire equipment is under negative pressure). It is used to transfer finished materials from the negative pressure environment of production to the external normal pressure environment. The buffer chamber contains a vacuum-sealed cavity and buffer doors that can be opened and closed at both ends. The buffer chamber doors use, but are not limited to, vent seals. The inlet is connected to the outer shell system to receive the thermoformed products and transport them to the buffer chamber. Then, the buffer chamber inlet is closed, and the balance port between the buffer chamber and the outside is opened to equalize the air pressure inside the buffer chamber with the outside air pressure. Then, the outlet of the buffer chamber is opened to transport the material out. After the material is transported, the outlet is closed, and a vacuum pump is used to evacuate the buffer chamber to create negative pressure. Once the pressure inside the buffer chamber is equal to the pressure inside the main tank, the buffer chamber inlet is opened to continue transporting the next batch of materials.

[0070] The trimming system consists of a frame, a mold closing power mechanism (servo press, hydraulic or electric push cylinder, etc.), and upper and lower trimming molds.

[0071] The unloading system consists of a frame, product unloading suction cups, a power mechanism, and a receiving platform. Driven by the power mechanism, the product unloading suction cups move into the edge-cutting equipment, simultaneously picking up the finished product and the edge material. The power mechanism then moves the product to the receiving position on the receiving platform, where the finished product and the edge material are placed in the finished product position and the edge material frame, respectively, completing the unloading process.

[0072] The product transfer mechanism is an in-mold transfer type, consisting of a servo motor, reducer, ball screw, guide rail, wet blank transfer mold, dry blank transfer mold, etc., to realize the transfer of dry blanks and wet blanks between different workstations.

[0073] Since the wet blank is not shaped before hot pressing and drying, it cannot be transferred using clamps or other fixtures that would cause deformation under stress. A contour suction cup must be used to transfer it, ensuring the stability of the wet blank's shape during the transfer process. When transferring the dry blank, since it has already been shaped, flexible grippers or ordinary suction cups can be used; the transfer method is not limited here.

[0074] Auxiliary supply system: The auxiliary supply system provides various energy supplies required for production at each workstation and key mechanism of the tableware production line, such as slurry supply, hot steam (other heat sources), vacuum components, protective nets, hydraulic oil tanks, air compressor systems, etc. Other accessories are not described in detail.

[0075] Example 1 This application also provides a production and processing equipment for pulp molded products; the entire pulp molding product line is placed in a sealed container (such as...). Figure 1 and Figure 2As shown, a vacuum pump is used on the outside of the sealed tank to evacuate the inside of the tank, thereby reducing the internal pressure and reaching a set value. The pressure inside the pulp molding equipment also decreases accordingly, resulting in less energy consumption when using high-temperature saturated steam or other heating methods to dry the wet blanks. Simultaneously, the reduced pressure inside the tank and the decreased effect of gas convection (the air becomes rarefied after the gas is removed by the vacuum pump) further reduce heat loss through conduction and convection. By controlling the working pressure inside the tank, a suitable cycle time is achieved between the molding and trimming stations, allowing the production line cycle time to be balanced using a single hot pressing station. A buffer chamber is installed outside the sealed tank to transfer the produced pulp molding products out of the sealed tank and maintain the negative pressure vacuum state within the sealed tank.

[0076] refer to Figure 1a As shown, due to the limited internal space of the sealed tank 4, and the small gaps between the molding machine 1, hot press 2, trimming machine 3, and the sealed tank 4, it is difficult for workers to perform installation or maintenance operations inside the sealed tank 4. Therefore, a moving platform 41 is provided in the sealed tank 4, on which the molding machine 1, hot press 2, and trimming machine 3 can all be placed. The moving platform 41 allows the molding machine 1, hot press 2, or trimming machine to be moved out of the sealed tank 4 for installation or maintenance. This increases the working space, making installation and maintenance more convenient and improving work efficiency.

[0077] Example 2 The working areas of the molding and hot pressing stations on the pulp molding line are sealed with pressure-resistant sealing doors, making them airtight areas (i.e., sealed chambers). A vacuum pump is used externally to evacuate the working areas of the molding and hot pressing stations (see reference). Figure 3 and Figure 4 The vacuum level can be set as needed.

[0078] A buffer chamber is installed between the hot pressing station and the trimming station. The purpose of the buffer chamber is to reduce the waste of vacuum generated during the transfer of products between the vacuum area and the external area. The buffer chamber allows the product to continuously switch between the hot pressing vacuum area and the trimming atmospheric pressure area. (Without a buffer chamber, the vacuum working areas of both the forming and hot pressing stations would be broken each time the product is transferred from the hot pressing station to the trimming station, requiring re-vacuuming during operation, resulting in waste and extending the hot pressing cycle time.) As the pressure inside the forming and hot pressing stations decreases, less energy is consumed when using high-temperature saturated steam or other heating methods to dry the wet blank at the hot pressing station. Simultaneously, the decrease in tank pressure within the sealed section and the reduction in the effect of gas convection (the air becomes rarefied after the gas is removed by the vacuum pump) further reduce heat loss through heat conduction and convection. By controlling the working pressure within the sealed area, a suitable cycle time matching forming and trimming can be obtained, allowing the production line cycle time to be balanced using only one hot pressing station. The product is transferred between the molding station, hot pressing station, buffer chamber, and trimming station using an in-mold transfer method.

[0079] Example 3 A partially sealed closure is installed around the upper and lower molds at the aforementioned hot pressing forming station. The closure includes an upper seal and a lower seal, which are designed according to the shape and size of the mold (square, round, or other shapes). Their specific shape is not limited to square; they can also be rectangular, spherical, etc., and no limitation is made here. The upper and lower seals are respectively mounted on the heating upper mold mounting plate and the heating lower mold mounting plate.

[0080] refer to Figure 5 and Figure 6 This method achieves localized sealing of the hot-press mold during hot pressing. An external vacuum pump is used to evacuate the sealed area; the vacuum level can be set as needed, thus creating a localized vacuum zone during the hot pressing process.

[0081] During the exchange of wet and dry blanks at the hot pressing station, the localized vacuum area formed during heating and drying is disrupted as the upper and lower molds separate. This causes some of the heat generated during heating the upper and lower molds to be lost as the vacuum is broken. Because the forming and hot pressing stations are surrounded by the equipment exterior, the interior of the equipment is isolated from the outside, reducing air convection and thus minimizing heat loss due to convection.

[0082] A vacuum buffer tank 11 is provided between the closure and the vacuum pump; the vacuum buffer tank 11 is connected to the vacuum pump and to the chamber of the closure. After the upper and lower seals are closed, the vacuum buffer tank 11 directly connects to the chamber in the closure, and can quickly evacuate the chamber to a vacuum state. Compared to the evacuation speed of the vacuum pump, the evacuation speed of the vacuum buffer tank 11 is significantly improved. This shortens the evacuation speed of the chamber in the closure and accelerates the drying and hot pressing speed of the wet blank, further increasing the hot pressing efficiency.

[0083] Example 4 The equipment used in this embodiment can be any of the equipment in embodiments 1 to 3 above. In this embodiment, only the pulp molding, mold, and equipment usage parameters are adjusted.

[0084] Relevant parameters

[0085] In this embodiment, after adjusting the equipment using the above parameters, pulp molding is carried out, and the usage of a certain amount of pulp molding is recorded.

[0086] Note: Steam consumption refers to the amount of steam used to prepare 1 ton of finished product.

[0087] The equipment and method used in this application significantly reduce steam consumption and have a shorter processing time compared to existing equipment, enabling rapid hot pressing and drying of wet blanks to obtain finished products. This significantly improves processing efficiency. Furthermore, due to the reduced hot pressing time, the forming rate and yield of wet blanks are also greatly improved.

[0088] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A production and processing equipment for pulp molded products, characterized in that, It includes a forming machine, a hot press, and an edge trimming machine. The forming machine is used to adsorb pulp to prepare a wet blank, the hot press can hot press the wet blank to obtain a dry blank, and the edge trimming machine is used to remove the edge material of the dry blank. Before and during hot pressing, the wet blank is kept in a vacuum environment.

2. The device according to claim 1, characterized in that, The device includes a sealed chamber, the hot press is installed in the sealed chamber, and a vacuum pump is connected to the sealed chamber, which is capable of evacuating the inside of the sealed chamber.

3. The device according to claim 2, characterized in that, The forming machine, hot press, and trimming machine are connected in sequence. A buffer chamber is provided between the hot press and the trimming machine, and the buffer chamber is connected to the sealing chamber.

4. The device according to claim 3, characterized in that, The buffer chamber is connected to the edge trimming machine, and the dry blank can enter the edge trimming machine through the buffer chamber.

5. The device according to claim 1, characterized in that, The hot press is equipped with a mold vacuum pump for extracting water vapor from the wet blank.

6. A production line for manufacturing and processing pulp molded products, characterized in that, It includes a forming machine, a hot press, and an edge trimming machine. The forming machine is used to adsorb pulp to prepare a wet blank, the hot press can hot press the wet blank to obtain a dry blank, and the edge trimming machine is used to remove the edge material of the dry blank. The hot press is equipped with a mold vacuum pump for extracting water vapor from the wet blank. The equipment production line includes a sealed tank, and the molding machine and hot press are installed in the sealed tank.

7. The equipment production line according to claim 6, characterized in that, The sealed container is in a sealed state, and a vacuum pump is connected to the sealed container, which can evacuate the inside of the sealed container.

8. The equipment production line according to claim 7, characterized in that, A buffer chamber is connected to the sealed container; the buffer chamber is connected to the sealed container.

9. The equipment production line according to claim 6, characterized in that, The sealed container can be in the form of a vertical container, a horizontal container, or a square container.

10. The equipment production line according to claim 6, characterized in that, A reciprocating moving platform is provided in the sealed tank, and the forming machine and / or hot press and / or trimming machine are arranged on the moving platform.

11. A hot press for molding pulp products, used for hot pressing wet blanks to obtain dry blanks; characterized in that, The hot press includes an upper mold and a lower mold for pressing wet blanks. A closure is provided on the hot press. The closure is hollow and forms a cavity. The upper mold and the lower mold are both located in the cavity inside the closure. A vacuum pump is connected to the closure and is connected to the cavity of the closure.

12. The hot press according to claim 11, characterized in that, The upper mold is capable of reciprocating movement; the closure includes an upper seal and a lower seal, the upper seal is connected to the upper mold and is capable of reciprocating movement with the upper mold, and the lower seal is connected to the lower mold.

13. The hot press according to claim 12, characterized in that, The upper seal and the lower seal can close together, and the upper seal and the lower seal can seal when closed.

14. The hot press according to claim 13, characterized in that, A vacuum buffer tank is provided between the closure and the vacuum pump; the vacuum buffer tank is connected to the vacuum pump and to the chamber of the closure.

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