Paper-plastic suction forming mold and manufacturing method thereof

Abstract

The application relates to the field of paper pulp molding technology and discloses a paper-plastic pulp suction forming die and a manufacturing method thereof. The paper-plastic pulp suction forming die comprises a pulp suction die, a pulp suction die core, a pressing die and a pressing die core. The first surface of the pulp suction die core is provided with a forming structure, and a plurality of pulp suction holes are arranged on the forming surface in a spaced manner. The plurality of pulp suction holes are uniformly arranged along the forming surface. The pulp suction hole axis can be changed according to the change of the forming surface by additive manufacturing. When the forming surface is relatively complex and has more curved surfaces, the pulp suction holes can be uniformly formed according to the change of the forming surface, the pulp suction capacity of each part of the forming surface can be kept consistent, the thickness of the formed paper pulp layer is more uniform during the pulp suction step, and the problem that the uniformity of the paper pulp layer formed after the pulp suction of the existing pulp suction die core is poor is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paper pulp molding, in particular to a paper-plastic pulp suction forming mold and a manufacturing method thereof. BACKGROUND

[0002] In industrial packaging products, paper-plastic products are becoming more and more common. A paper-plastic forming mold mainly consists of a pulp suction mold, a hot-pressing mold and a transfer mold. In the production of paper-plastic products, the pulp suction mold first sucks paper pulp in a pulp pool, then performs a hot-pressing process, and finally delivers the product through the transfer mold. The forming surface of the pulp suction mold is provided with a plurality of suction holes 1a, and the back of the pulp suction mold is provided with a suction machine table which provides suction force for the pulp suction mold. After the forming surface of the pulp suction mold is immersed in the pulp pool, the paper pulp flows to the suction holes 1a under the action of the suction force. The water in the paper pulp is sucked away through the suction holes 1a when the paper pulp flows through the forming surface. The remaining paper pulp forms a paper pulp layer on the forming surface, which can form a paper-plastic product after the hot-pressing process. The uniformity of the paper pulp layer on the forming surface of the pulp suction mold directly affects the quality of the paper-plastic product.

[0003] At present, as shown in Figure 1 and Figure 2 , the pulp suction mold in the existing pulp suction mold generally adopts machining forming. In this forming mode, the suction holes 1a on the pulp suction mold can only be horizontally arranged vertical holes. The diameter of the suction holes 1a is generally 2mm or more, and the hole distance is generally 6mm or more. If the forming surface has more curved surfaces, the suction holes 1a cannot be uniformly arranged. When the pulp suction mold sucks the pulp, the paper pulp layer formed on the forming surface is not uniform in thickness at the curved surface position. After the hot-pressing process, the paper-plastic product is prone to have uneven surface, wrinkles, light transmission, easy tearing and other phenomena. Therefore, the existing pulp suction mold also has the problem of poor uniformity of the paper pulp layer formed after sucking the pulp. SUMMARY

[0004] Therefore, the present application provides a paper-plastic pulp suction forming mold and a manufacturing method thereof to solve the problem of poor uniformity of the paper pulp layer formed after sucking the pulp in the existing pulp suction mold.

[0005] In a first aspect, the present invention provides a paper-plastic pulp suction forming mold, comprising: a pulp suction mold adapted to be disposed on a machine base support plate; a pulp suction mold core disposed on the pulp suction mold; a first surface of the pulp suction mold core having a forming structure; the forming structure having a forming surface; the forming surface including a plurality of curved surfaces; a plurality of pulp suction holes spaced apart on the forming surface; the plurality of pulp suction holes being evenly arranged along the forming surface; the extending direction of each pulp suction hole being perpendicular to the tangent of the curved surface at its location; an extrusion mold adapted to be disposed on a machine base support plate; and an extrusion mold core disposed on the extrusion mold, wherein the pulp suction mold core is formed by additive manufacturing; the pulp suction mold core is adapted to absorb pulp and form a pulp layer on the forming surface; and the extrusion mold core is adapted to cooperate with the pulp suction mold core to extrude the pulp layer.

[0006] Beneficial effects: Because the suction mold core is formed by additive manufacturing, the suction hole structure can be formed more flexibly on the forming surface. The axial direction of the suction hole can be changed according to the changes in the forming surface. When the forming surface is more complex and has many curved surfaces, the suction holes can still be formed evenly with the changes in the forming surface, so that the suction capacity of each part of the forming surface can be kept consistent. During the suction step, the thickness of the pulp layer formed is also more uniform, which greatly improves the quality of paper-plastic products and effectively solves the problem of poor uniformity of the pulp layer formed after suction by existing suction mold cores.

[0007] In one alternative implementation, any two adjacent suction holes are connected by a connecting hole located inside the main body.

[0008] Beneficial effects: If one of the suction holes is blocked, the suction pressure of the current suction hole can be supplemented by the surrounding suction holes, avoiding the reduction of suction pressure in the local suction hole due to blockage. During suction, the thickness of the pulp layer formed on the forming surface is more uniform, which helps to improve the quality of the product.

[0009] In one alternative implementation, any two adjacent suction holes are connected by a connecting groove provided on the surface of the molded structure.

[0010] Beneficial effects: The suction force of the pulp suction holes can be evenly distributed on the surface of the forming structure through the connecting groove. The surface of the forming structure can absorb pulp in a mesh-like manner, effectively improving the uniformity of the formed pulp layer.

[0011] In one optional implementation, the line connecting any two adjacent suction holes forms a connecting line, and the connecting grooves formed between the two sets of suction holes where the connecting lines intersect are interconnected.

[0012] Beneficial effects: The addition of diagonally intersecting connecting grooves can effectively increase the density of connecting grooves on the surface of the molded structure, further improving the uniformity of slurry absorption.

[0013] In an alternative embodiment, each connecting groove is uniform in cross-sectional shape along a direction perpendicular to the extending direction of the connecting groove, and / or the connecting groove is a U-shaped groove.

[0014] Beneficial effect: ensures that the suction force is more evenly distributed in each connecting groove, and the suction force on the surface of the forming structure is uniform when the pulp is sucked, thereby ensuring that the thickness of the formed pulp layer is uniform.

[0015] In an alternative embodiment, the groove width of the connecting groove is 0.5mm to 0.7mm.

[0016] Beneficial effect: Since the pulp suction die is formed by additive manufacturing, the groove width of the connecting groove can be made more fine, with a minimum of 0.5mm, and the entire surface of the stainless steel filter screen laid on the surface of the forming structure is smoother.

[0017] In an alternative embodiment, the diameters of the plurality of pulp suction holes are uniform.

[0018] Beneficial effect: ensures that the suction speed at the inlet of each pulp suction hole is uniform when the pulp is sucked, thereby ensuring that the thickness of the formed pulp layer is uniform.

[0019] In an alternative embodiment, the diameter of the pulp suction hole is 0.8mm to 8mm, and / or the distance between the axes of two adjacent pulp suction holes is greater than or equal to 0.95mm.

[0020] Beneficial effect: The pulp suction die is formed by additive manufacturing, the diameter of the pulp suction hole can be as small as 0.8mm, and the distance between the axes of the pulp suction holes can be as small as 0.95mm. The pulp suction holes formed on the surface of the forming structure are finer and denser. Compared with the original large-diameter and large-distance pulp suction holes, the overall uniformity and air permeability are better, the range of hole diameter and hole distance is larger, and the manufacturing is more flexible.

[0021] In an alternative embodiment, the main body is formed by additive manufacturing of stainless steel powder.

[0022] Beneficial effect: Compared with the existing aluminum main body, the structure is not easy to corrode, the structure strength is higher, and the main body is more durable.

[0023] In a second aspect, the present application also provides a paper-plastic pulp suction forming die manufacturing method for manufacturing the paper-plastic pulp suction forming die described above, the paper-plastic pulp suction forming die manufacturing method comprising:

[0024] Designing a three-dimensional model according to the structure and size data of the pulp suction die, and based on the three-dimensional model, the pulp suction die is formed by additive manufacturing through a 3D printing device, and the extrusion die, the extrusion die, the pulp suction die and the pulp suction die are assembled to form the paper-plastic pulp suction forming die.

[0025] Beneficial effect: the processing efficiency of the suction plug core is higher by additive manufacturing of the suction plug core through the 3D printing equipment, and the structure formed is more fine, and when forming small holes or grooves on the suction plug core, it can be easily realized.

[0026] In an optional embodiment, in the step of additive manufacturing of the suction plug core through the 3D printing equipment based on the three-dimensional model, the scanning layer thickness of the 3D printing equipment is 50um to 140um, the scanning power of the 3D printing equipment is 150W to 460W, the scanning speed of the 3D printing equipment is 600mm / s to 1800mm / s, the path offset interval of the 3D printing equipment is 0.08mm to 0.15mm, the scanning rotation angle of the 3D printing equipment is 45° to 113°, the scanning width of the 3D printing equipment is 8mm to 12mm, and the scanning overlap of the 3D printing equipment is 0.2mm to 0.5mm.

[0027] Beneficial effect: the process parameters are optimized for rapid printing, the large layer thickness printing process is realized, and the suction holes and connecting grooves in different directions of the formed structure surface can be formed without support, without the need for secondary processing. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0029] Figure 1 It is a three-dimensional schematic view of the suction plug core in the prior art;

[0030] Figure 2 It is Figure 1 It is a front view of the suction plug core shown in the figure;

[0031] Figure 3 It is a structure schematic view of a paper-plastic suction forming mold according to an embodiment of the present application;

[0032] Figure 4 It is Figure 3 It is a front view of the suction plug core of the paper-plastic suction forming mold shown in the figure;

[0033] Figure 5 It is Figure 4 It is a top view of the suction plug core shown in the figure;

[0034] Figure 6 It is Figure 4 It is a three-dimensional schematic view of the suction plug core shown in the figure;

[0035] Figure 7 Fig. 1 is a schematic view of a partial structure of a suction hole of a suction die core according to an embodiment of the present application; Figure 4 Fig. 2 is a schematic view of a partial structure of a suction hole of a suction die core according to another embodiment of the present application;

[0036] Figure 8 Fig. 3 is a top view of a partial structure of a suction hole according to the embodiment shown in Fig. 1. Figure 7 Fig. 4 is a top view of a partial structure of a suction hole according to the embodiment shown in Fig. 2.

[0037] Reference signs in the background art:

[0038] 1a, suction hole.

[0039] Reference signs:

[0040] 1, suction die core; 101, forming structure; 2, suction hole; 3, connecting hole; 4, connecting groove; 5, suction die; 6, extrusion die; 7, extrusion die core; 8, upper support plate of machine table; 801, air passage; 9, lower support plate of machine table; 901, liquid suction passage. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] In the related art, due to the limitation of machining forming, it is difficult to process fine structures on the forming surface, and the suction holes on the suction die core can only be vertical holes arranged horizontally in general. When the forming surface on the suction die core has many curved surfaces, the suction holes cannot be processed at the curved surface positions or vertical holes are still arranged at the curved surface positions. Since the curved surface does not extend along the horizontal direction, and the suction holes cannot be correspondingly changed in orientation along the extension direction of the curved surface, the suction holes arranged uniformly along the horizontal direction are not uniformly arranged in the extension direction of the curved surface position, thus causing the thickness of the pulp layer formed at the curved surface position to be inconsistent.

[0043] The embodiments of the present application will be described below with reference to Figures 1 to 8 .

[0044] According to an embodiment of the present application, in one aspect, a paper-plastic suction forming mold is provided, comprising: a suction mold 5, a suction mold core 1, an extrusion mold 6 and an extrusion mold core 7, the suction mold 5 is adapted to be arranged on a lower support plate 9 of a machine, the suction mold core 1 is arranged on the suction mold 5, a first surface of the suction mold core 1 is formed with a forming structure 101, the forming structure 101 has a forming surface, the forming surface comprises a plurality of curved surfaces, a plurality of suction holes 2 are arranged on the forming surface in a spaced manner, the plurality of suction holes 2 are uniformly arranged along the forming surface, the extension direction of each suction hole 2 is perpendicular to the tangent of the curved surface at the position where the suction hole 2 is located, the extrusion mold 6 is adapted to be arranged on an upper support plate 8 of the machine, the extrusion mold core 7 is arranged on the extrusion mold 6, wherein the suction mold core 1 is formed by additive manufacturing, the suction mold core 1 is adapted to suck paper pulp and form a paper pulp layer on the forming surface, and the extrusion mold core is adapted to cooperate with the suction mold core 1 to extrude the paper pulp layer.

[0045] The paper-plastic suction forming mold of the present embodiment can form the suction hole 2 structure on the forming surface more flexibly, the axial direction of the suction hole 2 can be changed according to the change of the forming surface, when the forming surface is relatively complex and has more curved surfaces, the suction hole 2 can still be uniformly formed along with the change of the forming surface, the suction capacity of each part of the forming surface can be kept consistent, the thickness of the formed paper pulp layer is also more uniform during the suction step, thereby greatly improving the quality of the paper-plastic product, and effectively solving the problem of poor uniformity of the paper pulp layer formed after the suction of the existing suction mold core.

[0046] Specifically, the extrusion mold 6 is fixed on the lower end surface of the upper support plate 8 of the machine, the suction mold 5 is fixed on the upper end surface of the lower support plate 9 of the machine, the lower end surface of the extrusion mold 6 and the upper end surface of the suction mold 5 are both provided with a mounting groove, the extrusion mold core 7 is detachably arranged in the mounting groove of the extrusion mold 6, the suction mold core 1 is detachably arranged in the mounting groove of the suction mold 5, the shape of the lower end of the extrusion mold core 7 corresponds to and matches the shape of the forming structure 101 on the upper end of the suction mold core 1, the specific shape structure of the two can be adjusted according to different products, and the extrusion mold core 7 and the suction mold core 1 with corresponding structures can be used for different products.

[0047] Further, the upper support plate 8 of the machine is also provided with an air suction channel 801, and the lower support plate 9 of the machine is also provided with a liquid suction channel 901, the air suction channel 801 and the liquid suction channel 901 provide suction force for the extrusion mold core 7 and the suction mold core 1 respectively.

[0048] Specifically, in related technologies, when the suction mold core is machined, if suction holes 2 are to be arranged on the complex forming surface, the processing difficulty and processing time will be greatly increased. Many curved surfaces cannot be machined with suction holes 2. Since paper-plastic products are diverse in type and style, and each paper-plastic product requires a separate suction mold core, in actual production, in order to manufacture the corresponding suction mold core for production more quickly, the suction holes 2 on the surface of the suction mold core can only be evenly distributed along the horizontal direction.

[0049] In this embodiment, the suction mold core is manufactured using additive manufacturing. The difficulty of arranging the suction holes 2 is no longer limited by the process, solving the problem of the time-consuming and laborious process of machining the suction holes 2 in traditional machining. As long as the arrangement of the suction holes 2 is designed, the production of the suction mold core can be simplified, fast and reliable. This not only reduces the processing difficulty and processing time, but also greatly improves the suction uniformity of the suction mold core. In the subsequent hot pressing production, the surface of the formed paper-plastic product is smoother and there will be no light transmission, uneven surface, etc., which improves the product yield and increases the yield by 3%.

[0050] In this embodiment, two adjacent suction holes 2 are connected by a connecting hole 3 inside the suction mold core 1. Since the suction holes 2 are connected by the connecting hole 3, the suction force of each suction hole 2 can be kept consistent when the suction mold core is suctioning. If one of the suction holes 2 is blocked, the suction pressure of the current suction hole 2 can be supplemented by the surrounding suction holes 2, avoiding the reduction of the suction pressure of the local suction hole 2 due to blockage. During suctioning, the thickness of the pulp layer formed on the forming surface is more uniform, which is conducive to improving the quality of the product.

[0051] Specifically, in order to ensure a more uniform suction force transmission, the inner diameter of each connection hole 3 is the same.

[0052] Furthermore, such as Figure 7 As shown, by setting the connecting hole 3 inside the suction mold core, the amount of material used in the mold core can be reduced without affecting its normal use, effectively reducing the weight of the product. It should be noted that since the suction mold core itself is strong enough, setting the connecting hole 3 will not significantly weaken the strength of the suction mold core.

[0053] In this embodiment, two adjacent suction holes 2 are connected by a connecting groove 4 provided on the surface of the forming structure 101. The suction force of the suction holes 2 can be evenly distributed on the surface of the forming structure 101 through the connecting groove 4. When the suction step is performed, the surface of the forming structure 101 can absorb the pulp in a mesh-like manner, which effectively improves the uniformity of the formed pulp layer.

[0054] In this embodiment, the line connecting two adjacent suction holes 2 forms a connecting line, and the connecting grooves 4 formed between the two sets of suction holes 2 that intersect the connecting line are interconnected. The connecting grooves 4 between the suction holes 2 are no longer limited to being arranged in the horizontal and vertical directions. The addition of obliquely intersecting connecting grooves 4 can effectively increase the density of connecting grooves on the surface of the molded structure 101. The greater the density of connecting grooves 4, the more uniformly the suction force of the suction holes 2 is distributed on the surface of the molded structure 101, further improving the uniformity of suction.

[0055] Among them, horizontal refers to Figure 6 The horizontal direction indicated by the middle arrow refers to the vertical direction. Figure 6 The "vertical" direction indicated by the middle arrow.

[0056] Specifically, such as Figure 6 and Figure 7 As shown, not only can suction holes 2 be evenly arranged on the surface of the molding structure 101, but also connecting grooves 4 with a large density can be formed, so that the suction state of the surface of the molding structure 101 can be changed from dense dots to an overall suction surface, which significantly improves the suction uniformity.

[0057] In this embodiment, each connecting groove 4 has the same cross-sectional shape along its extension direction perpendicular to itself, and / or the connecting groove 4 is a U-shaped groove, which ensures that the suction force in each connecting groove 4 is more evenly distributed, so that the suction force on the surface of the forming structure 101 remains consistent during pulp suction, thereby ensuring that the thickness of the formed pulp layer remains consistent.

[0058] In this embodiment, the width of the connecting groove 4 is 0.5mm to 0.7mm. Since the suction mold core is formed by additive manufacturing, the width of the connecting groove 4 can be made more precise, down to a minimum of 0.5mm. The stainless steel filter screen laid on the surface of the molded structure 101 makes the entire surface smoother.

[0059] Specifically, since the density of the connecting grooves 4 on the surface of the molded structure 101 is relatively large, in order to prevent the closely spaced connecting grooves 4 from interfering with each other, the width of the connecting grooves 4 needs to be set to be smaller. Compared with the original method of increasing the uniformity of suction on the surface of the molded structure 101 by using a wider connecting groove 4, reducing the groove width to increase the density of the connecting grooves 4 and improve the uniformity of suction is more direct and effective.

[0060] Preferably, the width of the connecting groove 4 is 0.6 mm.

[0061] In this embodiment, the apertures of the multiple suction holes 2 are consistent, ensuring that the suction speed of each suction hole 2 is consistent during suction, thereby ensuring that the thickness of the formed pulp layer is consistent.

[0062] Specifically, in order to better form a pulp layer on the surface of the molding structure 101, a metal filter screen is also fixed on the surface of the molding structure 101. The pulp passes through the metal filter screen to form a pulp layer, and the water in it is absorbed through the pulp suction hole 2.

[0063] Furthermore, as an alternative implementation, the diameter of the suction holes 2 can also be inconsistent. The suction holes 2 can be designed as irregular honeycomb shapes, so that the surface of the molding structure 101 forms a structure similar to the surface of a breathable steel. In this case, the overall diameter of the suction holes 2 on the surface of the molding structure 101 is small, and a filter structure can be directly formed, so there is no need to set a metal filter screen.

[0064] It should be noted that although the use of a breathable steel printing process to form the suction hole 2 can eliminate the need for a metal filter, the suction hole 2 of this structure will be in direct contact with the pulp, which is prone to clogging and difficult to clean once clogged. This can easily lead to malfunctions during actual use. Therefore, it is more convenient and reliable to use the suction hole 2 with a consistent hole diameter and a metal filter.

[0065] In this embodiment, the diameter of the suction hole 2 is 0.8mm to 8mm, and the distance between the axes of two adjacent suction holes 2 is greater than or equal to 0.95mm. The suction mold core is formed by additive manufacturing, and the diameter of the suction hole 2 can be as small as 0.8mm, the distance between the axes of the suction holes 2 can be as small as 0.95mm, and the distance between the sidewalls of two adjacent suction holes 2 can be as small as 0.15mm. This makes the suction holes 2 formed on the surface of the molded structure 101 finer and denser. Compared with the original large-diameter and large-spacing suction holes, not only is the overall uniformity and air permeability better, but the range of variation of hole diameter and hole spacing is also larger, and the manufacturing process is more flexible.

[0066] Specifically, such as Figure 8 As shown, A is the distance between the axes of two adjacent suction holes 2, and B is the diameter of suction hole 2. Figure 8 For example, A is 4mm and B is 1.5mm.

[0067] It should be noted that the distance between the axes of two adjacent suction holes 2 is not limited to 4mm, but can also be 2mm, 3mm, 5mm, etc., and the diameter of suction hole 2 is not limited to 1.5mm, but can also be 1mm, 2mm, etc.

[0068] In this embodiment, the suction mold core 1 is formed by additive manufacturing of stainless steel powder. Compared with the existing aluminum suction mold core, it is less prone to corrosion, has higher structural strength, and is more durable.

[0069] Specifically, since the surface of the forming structure 101 usually needs to fix the metal filter screen, and the metal filter screen is usually a stainless steel filter screen, the traditional aluminum suction pulp core 1 cannot be directly welded and fixed when fixing the stainless steel filter screen due to the difference in materials, and needs to fix a stainless steel rivet as a welding point on the surface of the aluminum suction pulp core 1, so as to fix the stainless steel filter screen; the suction pulp core 1 of the embodiment is directly manufactured by stainless steel powder, which is consistent with the material of the stainless steel filter screen, so that the stainless steel filter screen can be directly welded and fixed, eliminating the step of setting the rivet, and making the subsequent assembly and manufacturing process simpler and faster.

[0070] Next, the working process of the paper-plastic suction pulp forming mold of the embodiment will be described:

[0071] The lower support plate 9 of the machine drives the suction pulp core 1 to immerse in the paper pulp pool, and the suction liquid channel 901 on the lower support plate 9 of the machine provides suction force, so that the suction pulp core 1 sucks the paper pulp and forms a paper pulp layer on the surface of the forming structure 101; the lower support plate 9 of the machine drives the suction pulp core 1 to return to the initial position, and the upper support plate 8 of the machine drives the extrusion core 7 to move downward and fold with the suction pulp core 1 to extrude the paper pulp layer, where the paper pulp layer is preliminarily formed.

[0072] According to the embodiment of the present application, in another aspect, a paper-plastic suction pulp forming mold manufacturing method is provided for manufacturing the paper-plastic suction pulp forming mold described above, and the paper-plastic suction pulp forming mold manufacturing method comprises:

[0073] According to the structure and size data of the suction pulp core, a three-dimensional model is designed; based on the three-dimensional model, the suction pulp core is additively manufactured by a 3D printing device, and the extrusion die 6, the extrusion core 7, the suction die 5 and the suction pulp core 1 are assembled to form the paper-plastic suction pulp forming mold.

[0074] Specifically, the suction pulp core is additively manufactured by the 3D printing device, which has higher processing efficiency and can form more delicate structures, and can easily form small holes or grooves on the suction pulp core.

[0075] Further, the suction pulp core is additively manufactured by the 3D printing device without the need for material preparation, and can be printed on the machine after design is completed. Compared with the traditional machining process, which needs material preparation, rough machining, finishing and other processes, and generally needs more than 15 days for the machining period, the 3D printing only needs 5 days, which significantly shortens the manufacturing period of the suction pulp core.

[0076] In the embodiment, in the step of additive manufacturing of the suction plug core based on the three-dimensional model by the 3D printing device, the scanning layer thickness of the 3D printing device is 50 um to 140 um, the scanning power of the 3D printing device is 150 W to 460 W, the scanning speed of the 3D printing device is 600 mm / s to 1800 mm / s, the path offset interval of the 3D printing device is 0.08 mm to 0.15 mm, the scanning rotation angle of the 3D printing device is 45° to 113°, the scanning width of the 3D printing device is 8 mm to 12 mm, and the scanning overlap of the 3D printing device is 0.2 mm to 0.5 mm. The process parameters are optimized for rapid printing, the large layer thickness printing process is realized, and the suction holes 2 and the connecting grooves 4 in different directions on the surface of the formed structure 101 can be formed without support and do not need secondary processing.

[0077] Specifically, the suction plug core is manufactured by the 3D printing device, which can more uniformly form the suction holes 2 and the connecting grooves 4 with consistent size, and ensure uniform and reliable suction of the suction plug core.

[0078] Further, the paper-plastic suction plug core of the paper-plastic suction forming die is manufactured by metal 3D printing, mainly using SLM (selective laser melting) 3D printing technology. SLM technology is a process of melting and rapidly cooling metal powder by high-energy laser. The process is formed by the interaction between laser and powder. SLM technology can obtain fine metal parts and molds with near full density. It uses a high-energy laser heat source to completely melt metal powder and rapidly cool and solidify to form a high-density, high-precision metal part.

[0079] As an additive manufacturing technology, SLM has the general advantages of additive manufacturing, such as the ability to manufacture parts without geometric limitations, shortening the development and manufacturing cycle of products, and saving materials. At the same time, the metal parts formed by SLM also have the advantages of wide forming materials, fine grain size and uniform organization, excellent mechanical properties, high density, and high forming precision.

[0080] The core components of SLM include a host computer, a laser, an optical transmission system, a control system, and a software system. During manufacturing, the CAD model is first converted into an STL file and transmitted to the PC end of the SLM device. The STL file is sliced and processed by the working software configured on the device to generate two-dimensional information for each layer. After the data is imported, the device cavity door is sealed, vacuumed, and then filled with protective gas. The metal powder that needs to be preheated is set to a base preheating temperature. The process parameters are input into the control panel, including laser power, scanning speed, powder layer thickness, scanning distance, and scanning path. Then the manufacturing can be performed. The specific equipment and technical details can refer to the existing SLM technology, which will not be described here in detail.

[0081] While embodiments of the application have been described in connection with the preferred embodiments of the various figures, those of ordinary skill in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the application, and that such modifications and changes fall within the scope of the appended claims.

Claims

1. A paper-plastic suction forming mold, characterized in that, include: The suction mold (5) is suitable for being installed on the lower support plate (9) of the machine base. A suction mold core (1) is disposed on the suction mold (5). A molding structure (101) is formed on the first surface of the suction mold core (1). The molding structure (101) has a molding surface, which includes several curved surfaces. A plurality of suction holes (2) are spaced apart on the molding surface. The plurality of suction holes (2) are evenly arranged along the molding surface. The extension direction of each suction hole (2) on the curved surface is perpendicular to the tangent of the curved surface at its location. The extrusion die (6) is suitable for being mounted on the support plate (8) of the machine base. An extrusion die core (7) is disposed on the extrusion die (6); The pulp suction mold core (1) is formed by additive manufacturing. The pulp suction mold core (1) is adapted to suck up pulp and form a pulp layer on the forming surface. The extrusion mold core is adapted to cooperate with the pulp suction mold core (1) to extrude the pulp layer. The two adjacent suction holes (2) are connected by a connecting hole (3) provided inside the suction mold core (1); The two adjacent suction holes (2) are connected by a connecting groove (4) provided on the surface of the molding structure (101).

2. The paper-plastic suction forming mold according to claim 1, characterized in that, The line connecting two adjacent suction holes (2) forms a connecting line, and the connecting groove (4) formed between the two sets of suction holes (2) where the connecting line intersects is cross-connected.

3. The paper-plastic suction forming mold according to claim 1 or 2, characterized in that, Each of the connecting grooves (4) has the same cross-sectional shape along its extension direction perpendicular to itself. And / or, the connecting groove (4) is a U-shaped groove.

4. The paper-plastic suction forming mold according to claim 3, characterized in that, The width of the connecting groove (4) is 0.5 mm to 0.7 mm.

5. The paper-plastic suction forming mold according to claim 1 or 2, characterized in that, The diameter of the multiple suction holes (2) is the same.

6. The paper-plastic suction forming mold according to claim 1 or 2, characterized in that, The diameter of the suction hole (2) is 0.8 mm to 8 mm. And / or, the distance between the axes of two adjacent suction holes (2) is greater than or equal to 0.95 mm.

7. The paper-plastic suction forming mold according to claim 1 or 2, characterized in that, The suction mold core (1) is formed by additive manufacturing of stainless steel powder.

8. A method for manufacturing a paper-plastic suction molding die, characterized in that, A method for manufacturing a paper-plastic suction molding die according to any one of claims 1 to 7, comprising: A three-dimensional model was designed based on the structure and size data of the suction mold core (1); Based on the three-dimensional model, the suction mold core (1) is additively manufactured using 3D printing equipment. The extrusion mold (6), the extrusion mold core (7), the suction mold (5), and the suction mold core (1) are assembled to form the paper-plastic suction molding mold.

9. The method for manufacturing a paper-plastic suction molding die according to claim 8, characterized in that, In the step of additively manufacturing the suction mold core (1) based on the three-dimensional model using a 3D printing device, The 3D printing equipment has a scanning layer thickness of 50µm to 140µm, a scanning power of 150W to 460W, a scanning speed of 600mm / s to 1800mm / s, a path offset spacing of 0.08mm to 0.15mm, a scanning rotation angle of 45° to 113°, a scanning width of 8mm to 12mm, and a scanning overlap of 0.2mm to 0.5mm.

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