Processing Equipment and Method for a Paper-Plastic Tableware

Abstract

The present invention relates to a processing device and method for paper-plastic tableware, belonging to the technical field of paper-plastic tableware processing. Through the synergistic action of the cam part and the guide frame part, the reciprocating moving part is driven to perform an axial-radial compound movement, so that the pressing part continuously performs a closed-loop pressurization along the outer wall of the tableware, converting the intermittent linear contact of the traditional rigid pressure roller into a progressive surface contact. While applying a vertical pressure, a tangential shear force is superimposed, which not only expands the effective contact area to achieve uniform pressure distribution, but also destroys the fiber-water bonding bonds through the shearing action to dredge the water migration path and simultaneously suppress the hydraulic locking effect. The dynamic pressurization mode matches the change of the surface curvature in real time, eliminates local stress concentration, enables the wet blank fiber network to obtain directional compression and recombination, thereby improving the dehydration efficiency while reducing the rebound rate, and finally overcoming core defects such as edge collapse, microcracks and structural strength attenuation.

Description

Technical Field

[0001] The present invention belongs to the technical field of paper-plastic tableware processing, and specifically relates to a processing device and method for paper-plastic tableware. Background Art

[0002] At present, the industrial production of paper-plastic tableware such as lunch boxes and milk tea cups mainly relies on an assembly line process that coordinates multiple processes. First, a high-speed rotating blade of a pulper is used to mix pulp raw materials with water into a uniform suspension. Subsequently, the pulp is precisely adsorbed onto the surface of a metal mold by the vacuum adsorption principle of a forming machine to form a wet blank. In the pressing and dewatering process, existing equipment generally uses mechanical pressure rollers or hydraulic devices to apply vertical pressure to the wet blank to squeeze out water and preliminarily shape it. Then, hot pressing and shaping with a high-temperature mold is used to further remove residual water and strengthen the structural strength. In subsequent processes, a stamping die or a laser cutting device is responsible for trimming the rough edges to improve the contour accuracy. Finally, drying is completed by means of a hot air circulation drying tunnel or an infrared radiation device. Although this process can achieve large-scale production, there are significant technical bottlenecks in the key pressing and dewatering process, which directly affect the yield and performance of the finished product.

[0003] The bottleneck of the current process is concentrated in the pressing and dewatering process of frustum-shaped or trapezoidal tableware, such as the body of a milk tea cup and the arc-shaped edge of a lunch box. Since mechanical pressure rollers or hydraulic devices adopt a rigid pressure application mode, their physical properties are difficult to adapt to high-curvature curved surface structures. When applying vertical pressure, due to the inherent contradiction between the geometric characteristics of the frustum-shaped or trapezoidal tableware structure and the linear pressure application method of the pressure roller, the actual contact area between the pressure roller and the side wall of the tableware is significantly reduced compared to the theoretical ideal state, and the two can only form discontinuous linear contact within a limited range. This discontinuous contact mode significantly reduces the pressure transmission efficiency, and the fiber network cannot obtain sufficient and uniform compressive force. Eventually, the effective action area far fails to reach the process design expectation, resulting in an obvious pressure distribution imbalance, causing fiber breakage and gap cavitation. At the same time, in the area where the surface curvature changes suddenly, such as the transition area at the bottom of the cup, the water migration path is blocked due to uneven pressure distribution, forming a "hydraulic lock" effect, resulting in a decrease in dewatering efficiency and inducing microcracks. In addition, the static pressure application mode cannot dynamically respond to the continuous change of the surface curvature, causing non-uniform springback of the wet blank after demolding and significantly reducing the dimensional stability. The combined effect of these problems leads to defects such as edge collapse, seal failure, and compressive strength attenuation in the finished product. In view of this, a processing device and method for paper-plastic tableware are proposed. Summary of the Invention

[0004] To solve the above problems existing in the prior art, the present invention provides a processing device and method for paper-plastic tableware, which solves the problem of insufficient contact area caused by rigid pressure application during the pressing and dewatering process of frustum-shaped paper-plastic tableware, resulting in unbalanced pressure distribution.

[0005] The object of the present invention can be achieved by the following technical solutions: A processing device for paper-plastic tableware, comprising a pulper, a forming machine and a pressing and dewatering device. The pulper, the forming machine and the pressing and dewatering device are connected in sequence. The pressing and dewatering device includes a cam part, a guiding frame part, a reciprocating moving part, a sliding part and a pressing part arranged on the reciprocating moving part. The cam part is arranged inside the frame of the guiding frame part, and the cam part is in contact with the inner wall of the frame of the guiding frame part. The reciprocating moving part is vertically arranged on the guiding frame part. The sliding part slides along a direction perpendicular to the reciprocating moving part. The reciprocating moving part slides through the sliding part. The cam part drives the reciprocating moving part to perform axial and radial movements simultaneously through the guiding frame part. The reciprocating moving part drives the sliding part to reciprocate along a direction perpendicular to the reciprocating moving part. The reciprocating moving part drives the pressing part to continuously move along the outer wall of the paper-plastic tableware.

[0006] As a further solution of the present invention, the pressing and dewatering device further includes a support table, and both the cam part and the sliding part are arranged on the support table.

[0007] As a further solution of the present invention, the cam part is a ring, and a driving part is externally connected to the eccentric position of the ring. The driving part drives the ring to move, the ring drives the guiding frame part to move, and the guiding frame part drives the reciprocating moving part to drive the pressing part to perform a circular motion.

[0008] As a further solution of the present invention, the cam part is a triangular ring, and the three sides of the triangular ring are all arc-shaped structures. A driving part is externally connected to the eccentric position of the triangular ring. The driving part drives the triangular ring to move, the triangular ring drives the guiding frame part to move, and the guiding frame part drives the reciprocating moving part to drive the pressing part to perform a rectangular circular motion.

[0009] As a further solution of the present invention, the guiding frame part is a square frame, and the square frame is the circumscribed square of the cam part.

[0010] As a further solution of the present invention, the sliding part includes a sliding rod and two limiting blocks. The two limiting blocks are arranged on the support table, and the sliding rod slides through the two limiting blocks.

[0011] As a further solution of the present invention, the distance between the two limiting blocks is greater than the maximum width of the guiding frame part.

[0012] As a further solution of the present invention, the pressing part is a first electric telescopic part, and the end of the first electric telescopic part is in contact with the outer wall of the paper-plastic tableware.

[0013] As a further solution of the present invention, a limiting part for limiting the bottom of the paper-plastic tableware is further arranged on the support table, and the limiting part is arranged on the support table through a second electric telescopic part.

[0014] A processing method for paper-plastic tableware, comprising the following steps:

[0015] S1: First, the pulp raw material and water are mixed into a uniform suspension by the high-speed rotating blades of a pulper, and then the pulp is accurately adsorbed onto the surface of a metal mold by the vacuum adsorption principle of a forming machine to form a wet blank;

[0016] S2: In the pressing and dewatering step, the bottom of the paper-plastic tableware is placed on the limiting part for pre-limiting the paper-plastic tableware. Adjust the second electric telescopic member to raise the limiting part until the bottom of the paper-plastic tableware is on the same horizontal plane as the first electric telescopic member. Adjust the first electric telescopic member so that it fits against the outer wall of the paper-plastic tableware. Then, drive the cam part to make a reciprocating motion through a driving member. The cam part drives the guiding frame part to move, and the guiding frame part drives the reciprocating sliding part to move axially and radially simultaneously. The reciprocating sliding part drives the sliding part to reciprocate along a direction perpendicular to the reciprocating moving part, so that the reciprocating moving part drives the pressing part to complete the first closed-loop motion along the outer wall of the paper-plastic tableware;

[0017] S3: Then, adjust the first electric telescopic member so that it disengages from the outer wall of the paper-plastic tableware. Adjust the second electric telescopic member again to raise the limiting part so that the un-pressed part of the paper-plastic tableware is on the same horizontal plane as the first electric telescopic member. Adjust the first electric telescopic member so that it fits against the outer wall of the paper-plastic tableware. Then, drive the cam part to make a reciprocating motion through a driving member. The cam part drives the guiding frame part to move, and the guiding frame part drives the reciprocating sliding part to move axially and radially simultaneously. The reciprocating sliding part drives the sliding part to reciprocate along a direction perpendicular to the reciprocating moving part, so that the reciprocating moving part drives the pressing part to complete the second closed-loop motion along the outer wall of the paper-plastic tableware;

[0018] S4: Repeat step S3 until the entire outer wall of the paper-plastic tableware is pressed;

[0019] S5: Further remove the residual moisture and strengthen the structural strength through hot pressing and shaping with a high-temperature mold. In subsequent processes, a stamping mold or a laser cutting device is responsible for trimming the burrs to improve the contour accuracy, and finally, drying treatment is completed with the help of a hot air circulation drying channel or an infrared radiation device.

[0020] The beneficial effects of the present invention are:

[0021] For the first closed-loop pressurization, the driving member drives the cam portion to complete a single round-trip movement. The guiding frame portion drives the pressing portion to complete the first-round closed-loop pressurization along the outer wall of the tableware. In this stage, the bottom area is mainly compressed. For height adjustment and secondary pressurization, the first electric telescopic member retracts, and the second electric telescopic member lifts the limiting portion to align the unpressurized area with the pressing portion. Then, the cam portion is started again for pressurization, covering the middle and top areas in sequence, and the cycle continues until full coverage. Repeat the above steps until progressive surface contact pressurization is completed for all areas of the outer wall of the tableware, ensuring the directional reorganization of the fiber network and unobstructed water migration paths throughout. The segmented closed-loop pressurization mode dynamically adapts to the height and curvature changes of the tableware, achieving continuous and uniform pressure from the bottom to the top, and overcoming the problems of edge collapse and structural strength attenuation;

[0022] Through the combined motion design of the cam portion and the guiding frame portion, the precise limiting of the sliding portion, the adaptive adjustment of the electric telescopic member, and the segmented closed-loop pressurization method, the core problems of squeezing and dehydrating curved tableware in the prior art are systematically solved. Each component works together to achieve optimized pressure distribution, suppression of hydraulic lock-up, and dynamic curvature matching, ultimately improving the dehydration efficiency, finished product yield, and structural strength. Brief Description of the Drawings

[0023] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with the drawings.

[0024] Figure 1 It is a schematic perspective view of the squeezing and dehydrating device of the present invention;

[0025] Figure 2 It is a schematic side view of the squeezing and dehydrating device of the present invention;

[0026] Figure 3 It is a schematic view of the structure of the sliding portion of the present invention;

[0027] Figure 4 It is a schematic view of the installation position of the triangular ring of the present invention;

[0028] Figure 5 It is a flowchart of the processing method of the paper-plastic tableware of the present invention.

[0029] Main Element Symbol Explanation:

[0030] In the figure: 1. Cam portion; 2. Guiding frame portion; 3. Reciprocating moving portion; 4. Sliding portion; 41. Sliding rod; 42. Two limiting blocks; 5. Pressing portion; 6. Support platform; 7. Paper-plastic tableware; 8. Limiting portion; 9. Second electric telescopic member; 10. Triangular ring; 11. Driving member. Detailed Embodiments

[0031] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features, and their effects according to the present invention as follows.

[0032] Please refer to Figure 1 - Figure 5 As shown, this embodiment provides a processing device for paper-plastic tableware 7, including a pulper, a forming machine, and a pressing and dewatering device. The pulper, the forming machine, and the pressing and dewatering device are connected in sequence. When the processing device for paper-plastic tableware 7 is in use, first, the high-speed rotating blades of the pulper mix the pulp raw material with water to form a uniform suspension. Subsequently, the vacuum adsorption principle of the forming machine is used to accurately adsorb the pulp onto the surface of the metal mold to form a wet blank. In the pressing and dewatering process, the following pressing and dewatering device is used to replace the mechanical pressure roller or hydraulic device in the prior art to apply a vertical pressure to the wet blank to squeeze out the water and preliminarily shape it. Then, the hot pressing and shaping of the high-temperature mold is used to further remove the residual water and strengthen the structural strength. In the subsequent processes, the stamping mold or laser cutting equipment is responsible for trimming the rough edges to improve the contour accuracy. Finally, the drying process is completed with the help of a hot air circulation drying channel or an infrared radiation device;

[0033] The pressing and dewatering device includes a cam part 1, a guiding frame part 2, a reciprocating moving part 3, a sliding part 4, and a pressing part 5 arranged on the reciprocating moving part 3. The cam part 1 is arranged inside the frame of the guiding frame part 2, and the cam part 1 is in contact with the inner wall of the frame of the guiding frame part 2. The reciprocating moving part 3 is vertically arranged on the guiding frame part 2. The sliding part 4 slides along a direction perpendicular to the reciprocating moving part 3. The reciprocating moving part 3 slides through the sliding part 4. The cam part 1 drives the reciprocating moving part 3 to perform axial and radial movements simultaneously through the guiding frame part 2. The reciprocating moving part 3 drives the sliding part 4 to reciprocate along a direction perpendicular to the reciprocating moving part 3. The reciprocating moving part 3 drives the pressing part 5 to continuously move along the outer wall of the paper-plastic tableware 7. The pressing and dewatering device further includes a support table 6. Both the cam part 1 and the sliding part 4 are arranged on the support table 6. As Figure 1 shown, by combining the cam part 1 and the reciprocating moving part 3 in the pressing and dewatering device, dynamic adjustment can be made according to the curved surface shape of the tableware, so as to achieve full contact with the side wall of the tableware. The design of the cam part 1 and the guiding frame part 2 allows the reciprocating moving part 3 to move axially and radially simultaneously. In this way, the pressing part 5 can continuously move along the outer wall of the paper-plastic tableware 7 to adapt to the changes in the curved surface structure, avoiding the problems of insufficient contact area and uneven pressure distribution caused by the traditional linear pressing method. The continuous movement of the pressing part 5 can ensure that the fiber network obtains sufficient and uniform compressive force, avoiding fiber breakage and gap cavity formation, thereby improving the overall strength and dimensional stability of the tableware finished product.

[0034] Currently, the bottleneck in the processing technology of paper-plastic tableware such as lunch boxes and milk tea cups 7 is concentrated in frustum-shaped or trapezoidal tableware. For example, in the pressing and dehydration process of the body of a milk tea cup or the arc-shaped edge of a lunch box, due to the rigid pressing mode adopted by mechanical pressure rollers or hydraulic devices, their physical properties are difficult to adapt to high-curvature curved surface structures. When pressing vertically, due to the inherent contradiction between the geometric characteristics of the frustum-shaped or trapezoidal tableware structure and the linear pressing method of the pressure roller, the actual contact area between the pressure roller and the side wall of the tableware is significantly reduced compared to the theoretical ideal state. The two can only form intermittent linear contact within a limited range. This discontinuous contact mode significantly reduces the pressure transmission efficiency, and the fiber network cannot obtain sufficient and uniform compressive force, ultimately resulting in the effective action area far from reaching the process design expectation, forming an obvious pressure distribution imbalance, triggering fiber breakage and gap cavitation. At the same time, in the area of sudden change in surface curvature, such as the moisture migration path in the cup bottom transition area is blocked due to uneven pressure distribution, forming a "hydraulic lock-up" effect, resulting in a decrease in dehydration efficiency and inducing microcracks. In addition, the static pressing mode cannot dynamically respond to the continuous change of surface curvature, causing non-uniform springback of the wet blank after demolding, significantly reducing the dimensional stability. The coupling of these problems leads to defects such as edge collapse, seal failure, and compressive strength attenuation in the finished product.

[0035] To solve the above problems, in this embodiment, through the synergistic action of the cam portion 1 and the guide frame portion 2, the reciprocating movable portion 3 is driven to perform an axial-radial compound motion, so that the pressing portion 5 performs continuous closed-loop pressing along the outer wall of the tableware, converting the intermittent linear contact of the traditional rigid pressure roller into a progressive surface contact. While pressing vertically, a tangential shear force is superimposed, which not only expands the effective contact area to achieve uniform pressure distribution, but also destroys the fiber-water binding bond through the shear action to dredge the moisture migration path, synchronously suppressing the hydraulic lock-up effect. The dynamic pressing mode matches the change of surface curvature in real time, eliminates local stress concentration, and enables the fiber network of the wet blank to obtain directional compression and reorganization, thereby improving the dehydration efficiency while reducing the springback rate, and ultimately overcoming core defects such as edge collapse, microcracks, and structural strength attenuation.

[0036] In order to better solve the problems of uneven pressure distribution and hydraulic locking effect, in one embodiment, the cam portion 1 is a ring, and a driving member 11 is externally connected to the eccentric position of the ring. The driving member 11 is a servo motor. The driving member 11 drives the ring to move, and the ring drives the guiding frame portion 2 to move. The guiding frame portion 2 drives the reciprocating moving portion 3 to drive the pressing portion 5 to perform a circular motion. The guiding frame portion 2 is a square frame, and the square frame is the circumscribed square of the cam portion 1. The pressing portion 5 is a first electric telescopic member, and the end of the first electric telescopic member is attached to the outer wall of the paper-plastic tableware 7. The eccentric design of the ring causes it to generate an asymmetric motion trajectory during rotation, driving the guiding frame portion 2 to swing in the circumferential direction. The guiding frame portion 2 is a square frame, sleeved outside the ring, and its inner wall is attached to the outer wall of the ring. The reciprocating moving portion 3 is vertically fixed to the top of the guiding frame portion 2. The sliding rod 41 of the sliding portion 4 penetrates through the reciprocating moving portion 3 in the horizontal direction, and the sliding range is limited by a limiting block. The pressing portion 5 uses a first electric telescopic member and is installed at the end of the reciprocating moving portion 3, and can adaptively adjust the degree of fit with the outer wall of the paper-plastic tableware 7. The eccentric rotation of the ring drives the guiding frame portion 2 to generate a compound motion, enabling the reciprocating moving portion 3 to perform axial (vertical) and radial (horizontal) motions simultaneously. This motion trajectory causes the pressing portion 5 to form a continuous circular closed-loop pressurization path along the outer wall of the tableware, converting the discontinuous linear contact of the traditional pressing roller into a full-curved surface contact, significantly expanding the effective contact area, and realizing uniform pressure distribution. The pressing portion 5 superimposes a tangential shear force while vertically applying pressure, breaking the bonding keys between fibers and moisture, dredging the moisture migration path, and avoiding moisture retention in areas with sudden curvature changes such as the bottom transition area of the cup. The continuous rotation of the ring drives the pressing portion 5 to continuously match the curvature change of the tableware surface, eliminating local stress concentration and preventing fiber breakage and microcrack generation.

[0037] It is worth mentioning that for paper-plastic tableware 7 such as lunch boxes and milk tea cups, the lunch box can be frustum-shaped, rectangular or trapezoidal. In order to make the cam portion 1 adaptable to complex curved surfaces, in one embodiment, the cam portion 1 is a triangular ring 10. The three sides of the triangular ring 10 are all arc-shaped structures. The eccentric part of the triangular ring 10 is externally connected to a driving member 11. The driving member 11 drives the triangular ring 10 to move. The triangular ring 10 drives the guiding frame portion 2 to move. The guiding frame portion 2 drives the reciprocating moving portion 3 to drive the pressing portion 5 to perform a rectangular annular movement. The cam portion 1 is replaced by the triangular ring 10, the three sides of which are arc-shaped structures, and the eccentric part is connected to the driving member 11. The guiding frame portion 2 is still a square frame and is sleeved outside the triangular ring 10. The rotation of the triangular ring 10 drives the guiding frame portion 2 to move along a rectangular track, driving the reciprocating moving portion 3 and the pressing portion 5 to complete a rectangular annular pressing path. The sliding portion 4 includes a sliding rod 41 and two limiting blocks 42. The two limiting blocks 42 are arranged on the support table 6. The sliding rod 41 slides through the two limiting blocks 42. The distance between the two limiting blocks 42 is greater than the maximum width of the guiding frame portion 2. The distance between the limiting blocks of the sliding portion 4 is greater than the maximum width of the guiding frame portion 2, ensuring the free sliding of the sliding rod 41 in the horizontal direction. Among them, the arc-shaped design of the three sides of the triangular ring 10 can generate multi-directional composite movements during rotation, which is applicable to rectangular or trapezoidal tableware, such as the edge of a lunch box. The rectangular annular pressing path can cover the straight section and the corner area of the side wall of the tableware, avoiding the contact failure of the traditional pressure roller at the corner. In addition, the dynamic rectangular track pressing enables the wet blank fiber network to be directionally compressed and reorganized in multiple directions, reducing the anisotropic springback after demolding and improving the dimensional stability.

[0038] It should be noted that the sliding portion 4 is composed of a sliding rod 41 and two limiting blocks 42. The limiting blocks are fixed on the support table 6. The sliding rod 41 penetrates through the limiting blocks and slides in the horizontal direction. The distance between the two limiting blocks 42 is slightly greater than the maximum width of the guiding frame portion 2, ensuring that the guiding frame portion 2 is not interfered during movement. The first electric telescopic member of the pressing portion 5 is always in contact with the outer wall of the tableware through real-time telescopic adjustment. The limiting blocks precisely restrict the horizontal displacement of the sliding rod 41, avoiding the pressure position error caused by the inertial deviation of the reciprocating moving portion 3 and ensuring the accuracy of the closed-loop pressing path. The dynamic telescoping of the first electric telescopic member compensates for the height change of the tableware surface, such as the taper of a milk tea cup, so that the pressure is evenly transmitted to different curvature regions.

[0039] In order to ensure that when pressing paper-plastic tableware 7 such as lunch boxes and milk tea cups, local stress concentration is reduced and edge collapse and fiber breakage are avoided. For this, in an embodiment, a limiting portion 8 for limiting the bottom of the paper-plastic tableware 7 is further provided on the support table 6. The limiting portion 8 is arranged on the support table 6 through a second electric telescopic member 9. By adding the limiting portion 8 on the support table 6 and controlling its lifting through the second electric telescopic member 9, during the pressing and dehydration process, the bottom of the paper-plastic tableware 7 is fixed on the limiting portion 8, and the second electric telescopic member 9 adjusts the height of the limiting portion 8 so that the bottom of the tableware is on the same horizontal plane as the pressing portion 5. The first electric telescopic member adjusts in sections according to the height of the tableware, and the outer wall is pressurized layer by layer. Pressurization starts from the bottom layer by layer. Under the action of shear force, water is gradually guided upward, avoiding water retention in the unpressurized area at the top. At the same time, the pressurization of each layer will break the fiber-water bonding bonds and dredge the migration path to ensure that water is continuously discharged from the bottom layer to the top layer and finally completely removed through the top opening or subsequent drying process. After the bottom of the paper-plastic tableware 7 is fixed by the limiting portion 8, pressurization is carried out layer by layer upward to ensure that each layer obtains the support of the bottom structure when being pressurized. This progressive pressurization enables the fiber network to be directionally reorganized during the compression process, reducing local stress concentration and avoiding edge collapse and fiber breakage. Through the lifting of the limiting portion 8 and the sectional adjustment of the pressing portion 5, layered closed-loop pressurization can be carried out on high cylindrical tableware such as milk tea cups, avoiding problems such as overpressure at the bottom and underpressure at the top caused by one-time pressurization. Layered pressurization ensures that water migrates layer by layer from the bottom to the top, avoiding the formation of closed water sacs in the areas with sudden curvature changes and further improving the dehydration efficiency.

[0040] A processing method for paper-plastic tableware 7 includes the following steps:

[0041] S1: First, the pulp raw material and water are mixed into a uniform suspension by the high-speed rotating blades of a pulper, and then the pulp is accurately adsorbed onto the surface of a metal mold to form a wet blank by using the vacuum adsorption principle of a forming machine;

[0042] S2: In the pressing and dehydration process, the bottom of the paper-plastic tableware 7 is placed on the limiting portion 8 to pre-limit the paper-plastic tableware 7. The second electric telescopic member 9 is adjusted to make the limiting portion 8 rise until the bottom of the paper-plastic tableware 7 is on the same horizontal plane as the first electric telescopic member. The first electric telescopic member is adjusted so that the first electric telescopic member fits against the outer wall of the paper-plastic tableware 7. Then, the driving member 11 drives the cam portion 1 to make a reciprocating motion. The cam portion 1 drives the guiding frame portion 2 to move, and the guiding frame portion 2 drives the reciprocating sliding portion 4 to perform axial and radial movements simultaneously. The reciprocating sliding portion 4 drives the sliding portion 4 to reciprocate along a direction perpendicular to the reciprocating moving portion 3, so that the reciprocating moving portion 3 drives the pressing portion 5 to complete the first closed-loop motion along the outer wall of the paper-plastic tableware 7;

[0043] S3: Then adjust the first electric telescopic member so that the first telescopic member disengages from the outer wall of the paper-plastic tableware 7. Adjust the second electric telescopic member 9 again to raise the limiting portion 8, so that the paper-plastic tableware 7 at the non-pressed portion is on the same horizontal plane as the first electric telescopic member. Adjust the first electric telescopic member so that the first electric telescopic member fits against the outer wall of the paper-plastic tableware 7. Then drive the cam portion 1 to make a reciprocating motion through the driving member 11. The cam portion 1 drives the guide frame portion 2 to move. The guide frame portion 2 drives the reciprocating sliding portion 4 to perform axial and radial motions simultaneously. The reciprocating sliding portion 4 drives the sliding portion 4 to reciprocate along a direction perpendicular to the reciprocating moving portion 3, so that the reciprocating moving portion 3 drives the pressing portion 5 to complete the second closed-loop motion along the outer wall of the paper-plastic tableware 7;

[0044] S4: Repeat step S3 until the entire outer wall of the paper-plastic tableware 7 is pressed;

[0045] S5: Further remove the residual moisture and strengthen the structural strength through hot pressing and shaping by a high-temperature mold. In subsequent processes, a stamping mold or a laser cutting device is responsible for trimming the burrs to improve the contour accuracy. Finally, the drying process is completed by means of a hot air circulation drying tunnel or an infrared radiation device.

[0046] In order to better overcome the problems of edge collapse and structural strength attenuation, achieve uniform dehydration of the entire curved surface, and reduce the springback rate at the same time. In S2 - S4, for the first time, closed-loop pressurization is carried out. The driving member 11 drives the cam portion 1 to complete a single reciprocating motion. The guide frame portion 2 drives the pressing portion 5 to complete the first lap of closed-loop pressurization along the outer wall of the tableware. In this stage, the bottom area is focused on compression. For height adjustment and secondary pressurization, the first electric telescopic member retracts, and the second electric telescopic member 9 raises the limiting portion 8 to align the non-pressurized area with the pressing portion 5. Then start the cam portion 1 again for pressurization, covering the middle and top areas in sequence, and cycle until full coverage. Repeat the above steps until all areas of the outer wall of the tableware have completed progressive surface contact pressurization, ensuring the directional reorganization of the fiber network and the unobstructed moisture migration path throughout the process. The segmented closed-loop pressurization mode dynamically adapts to the height and curvature changes of the tableware, realizes continuous and uniform pressure from the bottom to the top, overcomes the problems of edge collapse and structural strength attenuation. The directional compression and reorganization of the fiber network reduce the elastic recovery after demolding and significantly improve the dimensional accuracy of the finished product.

[0047] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to make equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A processing device for paper-plastic tableware, characterized in that, It includes a pulper, a former, and a pressing and dewatering device. The pulper, the former, and the pressing and dewatering device are connected in sequence. The pressing and dewatering device includes a cam part, a guide frame part, a reciprocating moving part, a sliding part, and a pressing part arranged on the reciprocating moving part. The cam part is arranged inside the frame of the guide frame part, and the cam part fits with the inner wall of the frame of the guide frame part. The reciprocating moving part is vertically arranged on the guide frame part. The sliding part slides along a direction perpendicular to the reciprocating moving part. The reciprocating moving part slides through the sliding part. The cam part drives the reciprocating moving part to perform axial and radial movements simultaneously through the guide frame part. The reciprocating moving part drives the sliding part to reciprocate along a direction perpendicular to the reciprocating moving part. The reciprocating moving part drives the pressing part to continuously move along the outer wall of the paper-plastic tableware; The pressing and dewatering device further includes a support table, and both the cam part and the sliding part are arranged on the support table; The guide frame part is a square frame, and the square frame is the circumscribed square of the cam part; The cam part is a ring, and the eccentric position of the ring is externally connected to a driving part. The driving part drives the ring to move, and the ring drives the guide frame part to move. The guide frame part drives the reciprocating moving part to drive the pressing part to perform a circular motion. Or the cam part is a triangular ring, and the three sides of the triangular ring are all arc-shaped structures. The eccentric part of the triangular ring is externally connected to a driving part. The driving part drives the triangular ring to move, and the triangular ring drives the guide frame part to move. The guide frame part drives the reciprocating moving part to drive the pressing part to perform a rectangular circular motion.

2. The processing equipment for a paper-plastic tableware according to claim 1, wherein, The sliding part includes a sliding rod and two limit blocks. The two limit blocks are arranged on the support table, and the sliding rod slides through the two limit blocks.

3. The processing equipment for a paper-plastic tableware according to claim 2, characterized in that, The distance between the two limit blocks is greater than the maximum width of the guide frame part.

4. The processing equipment for a paper-plastic tableware according to claim 2, characterized in that, The pressing part is a first electric telescopic part, and the end of the first electric telescopic part fits with the outer wall of the paper-plastic tableware.

5. The processing equipment for a paper-plastic tableware according to claim 4, characterized in that, A limiting part for limiting the bottom of the paper-plastic tableware is further arranged on the support table, and the limiting part is arranged on the support table through a second electric telescopic part.

6. A processing method for paper-plastic tableware, based on the processing equipment for paper-plastic tableware described in any one of claims 1-5, characterized in that, It includes the following steps: S1: First, the pulp raw material and water are mixed into a uniform suspension by the high-speed rotating blades of the pulper. Subsequently, the pulp is accurately adsorbed onto the surface of the metal mold to form a wet blank by using the vacuum adsorption principle of the former; S2: In the pressing and dewatering link, place the bottom of the paper-plastic tableware on the limiting part to perform pre-limiting on the paper-plastic tableware. Adjust the second electric telescopic part to make the limiting part rise until the bottom of the paper-plastic tableware is on the same horizontal plane as the first electric telescopic part. Adjust the first electric telescopic part to make the first electric telescopic part fit with the outer wall of the paper-plastic tableware. Then, drive the cam part to perform a reciprocating motion through the driving part. The cam part drives the guide frame part to move. The guide frame part drives the reciprocating sliding part to perform axial and radial movements simultaneously. The reciprocating sliding part drives the sliding part to reciprocate along a direction perpendicular to the reciprocating moving part, so that the reciprocating moving part drives the pressing part to complete the first closed-loop motion along the outer wall of the paper-plastic tableware; S3: Then adjust the first electric telescopic member so that the first telescopic member disengages from the outer wall of the paper-plastic tableware. Adjust the second electric telescopic member again to raise the limiting portion, so that the paper-plastic tableware at the un-pressed portion is on the same horizontal plane as the first electric telescopic member. Adjust the first electric telescopic member so that the first electric telescopic member fits against the outer wall of the paper-plastic tableware. Then drive the cam portion to make a reciprocating motion through the driving member. The cam portion drives the guide frame portion to move. The guide frame portion drives the reciprocating sliding portion to perform axial and radial movements simultaneously. The reciprocating sliding portion drives the sliding portion to reciprocate along a direction perpendicular to the reciprocating moving portion, so that the reciprocating moving portion drives the pressing portion to complete the second closed-loop movement along the outer wall of the paper-plastic tableware; S4: Repeat step S3 until the entire outer wall of the paper-plastic tableware is pressed; S5: Further remove the residual moisture and strengthen the structural strength through hot pressing and shaping by the high-temperature mold. In subsequent processes, the stamping mold or laser cutting equipment is responsible for trimming the burrs to improve the contour accuracy. Finally, the drying process is completed with the help of a hot air circulation drying tunnel or an infrared radiation device.

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