Extrusion die and paper plastic forming apparatus

Abstract

The application relates to the paper-plastic forming technical field, in particular to an extrusion die and paper-plastic forming equipment, the extrusion die comprises an upper die assembly and a lower die assembly; the upper die assembly comprises an upper die main body and an air extraction bin, the upper die main body comprises a plurality of air extraction holes, one end of the plurality of air extraction holes is located at a die closing end of the upper die main body, the other end is communicated with the air extraction bin, and the air extraction holes are used for air extraction on a forming product; the lower die assembly comprises a lower die main body and a pulp suction bin, the lower die main body comprises a plurality of pulp suction holes, one end of the plurality of pulp suction holes is located at a die closing end of the lower die main body, the other end is communicated with the pulp suction bin, and the pulp suction holes are used for pulp suction on the forming product or air blowing on the forming product. After the pulp suction step, the extrusion and transfer functions can be realized simultaneously, in the extrusion step, part of water in the wet embryo can be effectively removed, the energy consumption required in the drying process is low, the water loss deformation amount is reduced, and in the extrusion process, the wet embryo can be secondarily shaped, so that the strength of the formed product is obviously improved.

Description

Technical Field

[0001] This application relates to the field of paper-plastic molding technology, and in particular to an extrusion mold and paper-plastic molding equipment. Background Technology

[0002] The paper-plastic molding process for packaging includes: crushing raw materials and dissolving them in water to form a suspension of a certain concentration; then, a suction mold draws away the water through suction holes in the mold, during which fibers coat the surface of the suction mold, ultimately forming a wet preform. The wet preform has a moisture content of about 70%, which is then dried using a natural gas drying line to reduce its moisture content to less than 5%, and finally, it is hot-pressed and shaped.

[0003] In this process, the moisture content of the wet preform formed by suction molding is about 70%. The drying process is energy-intensive, has high carbon emissions, long drying time, and low efficiency. After the wet preform is dried, it loses water and deforms severely, which affects subsequent hot pressing and other operations. In addition, the strength of the formed paper-plastic product is low, which affects the lightweight design of paper-plastic cushioning. Summary of the Invention

[0004] To address at least the above-mentioned technical problems existing in the prior art, this application provides an extrusion mold and a paper-plastic molding equipment.

[0005] This application provides an extrusion die, including an upper die assembly and a lower die assembly. The upper die assembly includes an upper die body and an air extraction chamber. The upper die body includes a plurality of air extraction holes, one end of which is located at the closed end of the upper die body, and the other end is connected to the air extraction chamber. The air extraction holes are used to extract air from the molded product. The lower die assembly includes a lower die body and a slurry suction chamber. The lower die body includes a plurality of slurry suction holes, one end of which is located at the closed end of the lower die body, and the other end is connected to the slurry suction chamber. The slurry suction holes are used to suction slurry from the molded product or to blow air onto the molded product.

[0006] In some embodiments, the upper mold body and the lower mold body further include a ventilation structure; when the air extraction hole extracts air and the slurry suction hole sucks slurry, the ventilation structure is used to continuously supply air into the upper mold body or the lower mold body.

[0007] In some embodiments, the ventilation structure includes a strip-shaped groove disposed at the mold closing end of the upper mold body and at the mold closing end of the lower mold body; one end of the strip-shaped groove is connected to the outer side of the upper mold body and the lower mold body, and the other end is connected to the air extraction hole or the slurry suction hole.

[0008] In some embodiments, the upper mold body and the lower mold body include a plurality of ventilation structures; the plurality of ventilation structures are connected to the air extraction holes or the slurry suction holes at different locations.

[0009] In some embodiments, a plurality of the ventilation structures are uniformly arranged circumferentially along the upper mold body and the lower mold body.

[0010] In some embodiments, the air extraction chamber is provided with a main air extraction hole on the side away from the mold closing end; the slurry suction chamber is provided with a main slurry suction hole on the side away from the mold closing end.

[0011] In some embodiments, a plurality of air extraction holes are arranged in an array, and a plurality of slurry suction holes are arranged in an array; the main air extraction hole is located at the center of the side where the air extraction chamber is located, and the main slurry suction hole is located at the center of the side where the slurry suction chamber is located.

[0012] In some embodiments, the closing end of the upper mold body is in the shape of a groove, and the closing end of the lower mold body is in the shape of a protrusion; after the closing ends of the upper mold body and the lower mold body are closed, there are a planar gap and a side gap; the planar gaps are spaced at the same interval, and the side gaps gradually increase in interval along the direction from the planar gap to the end of the side gap.

[0013] In some embodiments, the compression range of the upper die assembly and the lower die assembly is from 0.5 mm to 1 mm.

[0014] This application also provides a paper-plastic molding apparatus, including the above-mentioned extrusion mold.

[0015] This application provides an extrusion mold and paper-plastic molding equipment. In use, the lower mold body is placed in a slurry tank, and air is drawn in through the slurry suction holes, causing the slurry to collect on the lower mold body. Then, the lower mold body leaves the slurry tank and closes with the upper mold body. During the mold closing process, the lower mold body is pressurized, increasing the closing force between the lower and upper mold bodies. Simultaneously, air is drawn from the air extraction holes of the upper mold body and the slurry suction holes of the lower mold body, expelling moisture from the mold during the mold closing process. After a period of drainage, the slurry suction holes of the lower mold body switch to blowing air, transferring the extruded wet preform to the upper mold body. This technical solution allows for simultaneous extrusion and transfer functions after the slurry suction step. The extrusion step effectively removes some moisture from the wet preform, resulting in low energy consumption during drying. Furthermore, the deformation due to water loss is reduced, and the wet preform can be reshaped during extrusion, significantly improving the strength of the molded product. Attached Figure Description

[0016] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which:

[0017] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0018] Figure 1 This is a schematic diagram of the structure of the extrusion die provided in an embodiment of this application;

[0019] Figure 2 A cross-sectional view of an extrusion die provided in an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the structure of the upper die assembly or lower die assembly in the extrusion die provided in the embodiments of this application;

[0021] Figure 4 Another cross-sectional view of the extrusion die provided in an embodiment of this application.

[0022] In the picture:

[0023] 10: Upper mold assembly; 20: Lower mold assembly; 30: Ventilation structure; 40: Wet blank; 50: Planar clearance; 60: Side clearance;

[0024] 11: Upper mold body; 12: Air extraction chamber; 13: Air extraction hole; 14: Main air extraction hole;

[0025] 21: Lower mold body; 22: Slurry suction chamber; 23: Slurry suction hole; 24: Main slurry suction hole;

[0026] 31: Strip groove. Detailed Implementation

[0027] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] This application provides an extrusion die, including an upper die assembly and a lower die assembly. After the slurry suction step is completed, the upper die assembly and the lower die assembly are closed. During the closing process, the lower die assembly applies pressure to achieve cold extrusion of the wet blank. During the process, the air extraction hole and the slurry suction hole simultaneously perform air extraction to promptly discharge the moisture generated during the extrusion process from the die. After the extrusion step is completed, the slurry suction hole of the lower die assembly blows air in the opposite direction, while the upper die assembly continues to perform air extraction to transfer the wet blank, which has lost some moisture during extrusion, to the upper die for subsequent drying, shaping and other operations.

[0029] The following description, in conjunction with the accompanying drawings, details the components, connection relationships, and positional relationships of the extrusion die provided in the embodiments of this application.

[0030] like Figures 1 to 3As shown in the embodiment of this application, the upper mold assembly 10 includes an upper mold body 11 and an air extraction chamber 12. The upper mold body 11 includes a plurality of air extraction holes 13. One end of the plurality of air extraction holes 13 is located at the mold closing end of the upper mold body 11, and the other end is connected to the air extraction chamber 12. The air extraction holes 13 are used to extract air from the molded product. The lower mold assembly 20 includes a lower mold body 21 and a slurry suction chamber 22. The lower mold body 21 includes a plurality of slurry suction holes 23. One end of the plurality of slurry suction holes 23 is located at the mold closing end of the lower mold body 21, and the other end is connected to the slurry suction chamber 22. The slurry suction holes 23 are used to suction slurry from the molded product or to blow air onto the molded product.

[0031] The upper mold body 11 and the lower mold body 21 have similar structures, and both can perform air extraction operations. The main differences include that the lower mold body 21 can also perform air blowing operations, i.e., using the suction hole 23 in reverse to complete the transfer of the extruded wet blank 40; another difference is that the closing ends of the upper mold body 11 and the lower mold body 21 are determined according to the product shape. For example, the closing end of the lower mold body 21 is grooved, and the closing end of the upper mold body 11 is convex. After the upper mold body 11 and the lower mold body 21 are closed, a groove-shaped product can be formed, or, as... Figures 1 to 3 As shown, the closing ends of the upper mold body 11 and the lower mold body 21 are both horizontal, which can form flat products.

[0032] The extrusion die provided in this application embodiment first performs a slurry suction operation. A filter screen is set at the end of the slurry suction hole 23. The lower die assembly 20 is placed in the slurry pool. The slurry suction hole 23 is activated. When the slurry suction hole 23 sucks, the liquid in the slurry pool flows and is then adsorbed onto the lower die assembly 20. After the slurry suction is completed, the lower die assembly 20 is lifted and separated from the slurry pool. Then the upper die assembly 10 and the lower die assembly 20 are closed to perform the extrusion step.

[0033] During the extrusion process, the lower die assembly 20 applies pressure to the upper die assembly 10. Simultaneously, the air extraction hole 13 of the upper die assembly 10 performs an air extraction operation, and the suction hole 23 of the lower die assembly 20 performs an air extraction operation. During the air extraction process, the moisture generated by the extrusion (the moisture released from the wet blank 40) is extracted in time. The extrusion step can remove some of the moisture in the wet blank 40.

[0034] For example, with an extrusion pressure of 0.1 MPa to 0.3 MPa and an extrusion time of 5 to 10 seconds, the moisture content of the wet embryo 40 is reduced from about 70% to about 55%, and about 15% of the moisture can be squeezed out.

[0035] After the extrusion step is completed, the wet blank 40 is transferred. At this time, the air extraction hole 13 of the upper mold assembly 10 further extracts air, while the slurry suction hole 23 of the lower mold assembly 20 blows air in the opposite direction to the wet blank 40. The extruded wet blank 40 separates from the lower mold body 21 and is transferred to the upper mold body 11. The upper mold body 11 moves the wet blank 40 to subsequent operations, while the lower mold body 21 can repeat the slurry suction and other steps.

[0036] For example, multiple air extraction holes 13 are arranged in an array, and multiple slurry suction holes 23 are arranged in an array. The air extraction holes 13 and slurry suction holes 23 form multiple arrayed holes at the mold closing end, forming a stable air extraction / blowing operation at each position of the wet blank 40.

[0037] The air extraction chamber 12 is located on the side away from the mold closing end and has a main air extraction hole 14; the slurry suction chamber 22 is located on the side away from the mold closing end and has a main slurry suction hole 24. The main air extraction hole 14 and the main slurry suction hole 24 are respectively connected to gas generating equipment. The gas generating equipment connected to the main air extraction hole 14 is used for air extraction operation, and the gas generating equipment connected to the main slurry suction hole 24 is used for air extraction or air blowing operation.

[0038] For example, the main air extraction port 14 is located in the center of the side where the air extraction chamber 12 is located, and the main slurry suction port 24 is located in the center of the side where the slurry suction chamber 22 is located. This facilitates the disassembly and assembly of the gas generating equipment and avoids the situation of unbalanced suction caused by excessive or insufficient gas force in local areas during the air extraction or blowing process.

[0039] like Figures 1 to 3 As shown in the embodiment of this application, the upper mold body 11 and the lower mold body 21 also include a ventilation structure 30; when the air extraction hole 13 extracts air and the slurry suction hole 23 sucks slurry, the ventilation structure 30 is used to continuously supply air into the upper mold body 11 or the lower mold body 21.

[0040] By setting up a ventilation structure 30, the upper mold body 11 and the lower mold body 21 are prevented from being completely enclosed, thereby ensuring that the evacuation operation can continue.

[0041] For example, the ventilation structure 30 includes a strip-shaped groove 31 located at the mold closing end of the upper mold body 11 and at the mold closing end of the lower mold body 21. One end of the strip-shaped groove 31 communicates with the outer side of the upper mold body 11 and the lower mold body 21, and the other end communicates with the air extraction hole 13 or the slurry suction hole 23. By providing the strip-shaped groove 31, air can be continuously supplied into the upper mold body 11 or the lower mold body 21. For example, a strip-shaped groove 31 of a certain length is provided at the mold closing end, and the strip-shaped groove 31 communicates with multiple air extraction holes 13 or slurry suction holes 23. By supplying outside air into the multiple air extraction holes 13 or slurry suction holes 23, the stability under air extraction conditions is further improved.

[0042] For example, the upper mold body 11 and the lower mold body 21 include multiple ventilation structures 30; these multiple ventilation structures 30 are connected to air extraction holes 13 or slurry suction holes 23 at different locations. Alternatively, for example, the multiple ventilation structures 30 are evenly arranged circumferentially along the upper mold body 11 and the lower mold body 21. By using multiple and evenly arranged ventilation structures 30 for ventilation operations, the internal pressure of the upper mold body 11 and the lower mold body 21 can be effectively balanced, avoiding excessive local pressure within the upper mold body 11 and the lower mold body 21.

[0043] In this embodiment, the shapes of the upper mold assembly 10 and the lower mold assembly 20 are set according to the type of product. Taking a paper-plastic packaging structure as an example, the packaging structure is a concave structure, therefore, the upper mold assembly 10 and the lower mold assembly 20 need to be set with corresponding structures.

[0044] That is, such as Figure 4 As shown, the mold closing end of the upper mold body 11 is in the shape of a groove, and the mold closing end of the lower mold body 21 is in the shape of a protrusion. After the mold closing ends of the upper mold body 11 and the lower mold body 21 are closed, there are a planar gap 50 and a side gap 60. The planar gaps 50 are spaced at the same interval, and the side gaps 60 gradually increase in interval from the planar gaps 50 to the end of the side gaps 60. When the side gaps 60 are small, it is easy for the slurry to be pushed, which will cause the tearing and poor performance. Therefore, the width of the side gaps 60 is set to a gradual form, which can effectively eliminate the occurrence of slurry pushing.

[0045] For example, after the mold closing end of the upper mold body 11 and the mold closing end of the lower mold body 21 are closed, the plane gap 50 is 1.5 mm, and the side gap 60 is gradually increased, with the gap being 1.5 mm near the plane gap 50 and gradually increasing to 2.0 mm away from the plane gap 50. For example, after the lower mold assembly 20 is pressurized, the compression range of the upper mold assembly 10 and the lower mold assembly 20 is 0.5 mm to 1 mm.

[0046] This application provides a paper-plastic molding device, including the above-mentioned extrusion mold. The extrusion mold can extrude and transfer the wet preform 40. The extrusion step can effectively reduce the moisture content in the wet preform 40.

[0047] The paper-plastic molding equipment also includes a pressure boosting device, which applies pressure to the lower die assembly 20 during the extrusion process. For example, the pressure boosting device provides an extrusion pressure of 0.1 MPa to 0.3 MPa.

[0048] In paper-plastic molding equipment, compared with existing technologies, by adding an extrusion operation, the hot pressing and shaping time of the product can be reduced by about 40 seconds, and the moisture content of the wet preform decreases by about 15%.

[0049] This application provides an extrusion mold and paper-plastic molding equipment. In use, the lower mold body 21 is placed in a slurry tank, and the slurry suction hole 23 draws air, causing the slurry to collect on the lower mold body 21. Then, the lower mold body 21 leaves the slurry tank and closes with the upper mold body 11. During the mold closing process, the lower mold body 21 is pressurized, increasing the closing force between the lower mold body 21 and the upper mold body 11. Simultaneously, the air extraction hole 13 of the upper mold body 11 draws air, and the slurry suction hole 23 of the lower mold body 21 draws air, expelling moisture from the mold during the mold closing process. After a period of drainage, the slurry suction hole 23 of the lower mold body 21 switches to blowing air, transferring the extruded wet preform 40 onto the upper mold body 11. This technical solution allows for simultaneous extrusion and transfer functions after the slurry suction step. During the extrusion step, some moisture in the wet preform 40 can be effectively removed, resulting in low energy consumption during drying. Furthermore, the deformation due to water loss is reduced, and the wet preform 40 can be reshaped during the extrusion process, significantly improving the strength of the molded product.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An extrusion die characterized by, Includes an upper mold assembly (10) and a lower mold assembly (20); The upper mold assembly (10) includes an upper mold body (11) and an air extraction chamber (12). The upper mold body (11) includes a plurality of air extraction holes (13). One end of the plurality of air extraction holes (13) is located at the mold closing end of the upper mold body (11), and the other end is connected to the air extraction chamber (12). The air extraction holes (13) are used to extract air from the molded product. The lower mold assembly (20) includes a lower mold body (21) and a suction chamber (22). The lower mold body (21) includes a plurality of suction holes (23). One end of the plurality of suction holes (23) is located at the mold closing end of the lower mold body (21), and the other end is connected to the suction chamber (22). The suction holes (23) are used to suction the molded product or blow air onto the molded product. The upper mold body (11) and the lower mold body (21) include multiple ventilation structures (30); the multiple ventilation structures (30) are connected to the air extraction holes (13) or the slurry suction holes (23) at different positions; the multiple ventilation structures (30) are evenly arranged circumferentially along the upper mold body (11) and the lower mold body (21).

2. The extrusion die of claim 1, wherein The upper mold body (11) and the lower mold body (21) also include a ventilation structure (30). When the air extraction hole (13) extracts air and the slurry suction hole (23) sucks slurry, the ventilation structure (30) is used to continuously supply air into the upper mold body (11) or the lower mold body (21).

3. The extrusion die of claim 2, wherein The ventilation structure (30) includes a strip groove (31) provided at the mold closing end of the upper mold body (11) and at the mold closing end of the lower mold body (21). One end of the strip groove (31) is connected to the outer side of the upper mold body (11) and the lower mold body (21), and the other end is connected to the air extraction hole (13) or the slurry suction hole (23).

4. The extrusion die of claim 1, wherein The air extraction chamber (12) is provided with a main air extraction hole (14) on the side away from the mold closing end. The suction chamber (22) is located on the side away from the mold closing end and has a main suction hole (24).

5. The extrusion die of claim 4, wherein The plurality of air extraction holes (13) are arranged in an array, and the plurality of slurry suction holes (23) are arranged in an array; The main air extraction hole (14) is located in the center of the side where the air extraction chamber (12) is located, and the main slurry suction hole (24) is located in the center of the side where the slurry suction chamber (22) is located.

6. The extrusion die of any one of claims 1 to 5, wherein, The mold closing end of the upper mold body (11) is in the shape of a groove, and the mold closing end of the lower mold body (21) is in the shape of a protrusion. After the mold closing end of the upper mold body (11) and the mold closing end of the lower mold body (21) are closed, there is a planar gap (50) and a side gap (60). The planar gaps (50) are spaced at the same intervals, and the side gaps (60) gradually increase in intervals along the direction from the planar gaps (50) to the ends of the side gaps (60).

7. The extrusion die of claim 6, wherein The compression range of the upper die assembly (10) and the lower die assembly (20) is 0.5 mm to 1 mm.

8. A paper-plastic forming apparatus characterized by comprising: Includes the extrusion die as described in any one of claims 1 to 7.

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