Suction mold, molding mold, manufacturing mold, production process of pulp molded container, and pulp molded container

Abstract

This application provides a pulp suction mold, a shaping mold, a manufacturing mold, a production process for a pulp molded container, and the pulp molded container itself, relating to the field of pulp molded container technology. This application utilizes a pulp suction mold to create an inwardly turned-up edge structure at the mouth of the pulp molded container during the pulp suction process. The shaping mold then shapes this inwardly turned-up edge structure, resulting in an inwardly turned-up edge structure with a flat mouth and a certain thickness. This not only saves on the die-cutting process but also significantly improves the sealing performance of the pulp molded container, thereby reducing the manufacturing cost of the pulp molded container.

Description

Technical Field

[0001] This application relates to the field of pulp molding container technology, specifically to pulp suction molds, shaping molds, manufacturing molds, production processes for pulp molding containers, and pulp molding containers. Background Technology

[0002] Pulp molded containers are used to hold and package products. Their raw materials are various fibrous materials, such as bamboo, sugarcane, and wood—renewable plant materials that are abundant, easily recyclable, and do not harm the environment or human health. In existing pulp molded container molding processes, the mold and the structure of the pulp molded container are identical. For example, in pulp molded bottles, the wall thickness of the bottle neck is the same as the wall thickness of the container body (0.8mm~1.0mm). However, this bottle neck wall thickness does not meet the requirements for heat treatment. The required seal thickness (2.0mm ± 0.2mm) makes it impossible to achieve a precise fit when using a bottle cap to seal the pulp molded bottle, resulting in gaps and poor sealing performance. This poses a risk of leakage during transportation, sales, storage, and end-consumer use. Increasing the overall wall thickness of the container would waste materials and reduce the effective volume. Furthermore, the uneven wall thickness at the mouth of the prepared pulp molded container necessitates an additional die-cutting process, which is complex and costly.

[0003] Although it is relatively easy to thicken the mouth of containers made of highly malleable materials such as plastic and metal containers, for example, by using injection molding, this method cannot meet the requirements of loose and less malleable materials such as pulp. Summary of the Invention

[0004] In view of this, this application provides a pulp suction mold, a shaping mold, a manufacturing mold, a production process for a pulp molding container, and a pulp molding container. It solves the technical problems in the prior art where the wall thickness of the opening of the pulp molding container is the same as the wall thickness of the main body of the pulp molding container, resulting in poor sealing performance, and the wall thickness of the opening of the pulp molding container is uneven, requiring additional die-cutting processes for high cost.

[0005] According to the first aspect of this application, this application provides a manufacturing process for a pulp molded container. The process involves placing a suction mold in pulp slurry and performing suction treatment to obtain a semi-dry preform of the pulp molded container. The semi-dry preform includes a main structure and a mouth structure; the edge of the mouth structure has an inwardly turned edge; the semi-dry preform is placed in a shaping mold, and the mouth structure with the inwardly turned edge is shaped to obtain a pulp molded container with an inwardly turned edge at the mouth edge.

[0006] In one possible implementation, the step of placing the suction mold in the pulp slurry and obtaining a semi-dry blank of the pulp molded container through suction treatment includes: connecting the suction mold to a vacuum device for suction treatment to obtain a molded semi-dry blank of the pulp molded container with an inwardly flanged opening, wherein the suction treatment time is 5s to 10s; the moisture content of the wet blank is 60% to 80%, the thickness of the wet blank is 2mm to 3mm, and the length of the opening of the wet blank is 1mm to 1.5mm longer than the length of the opening of the shaping mold; the molded semi-dry blank is dehydrated in the suction mold at room temperature for 10s to 15s, at a pressure of 2 to 4 MPa, and the moisture content of the molded semi-dry blank after dehydration is 40% to 60%.

[0007] In one possible implementation, the step of placing the semi-dry preform in a shaping mold and shaping the opening structure of the semi-dry preform with an inwardly turned edge to obtain a pulp molded container with an inwardly turned edge includes: placing a shaped semi-dry preform with a moisture content of 40% to 60% in the shaping mold, heating the shaped semi-dry preform, and driving an extrusion mechanism or shaping mold to move in opposite directions through a driving structure, thereby shaping the edge of the opening structure of the pulp molded container inward, thus obtaining a pulp molded container with an inwardly turned edge. The heating temperature for the shaped semi-dry preform with a moisture content of 40% to 60% is 120℃ to 140℃; the heating time is 2 min to 4 min; and the pressure for shaping the shaped semi-dry preform with a moisture content of 40% to 60% is 6 MPa to 10 MPa.

[0008] According to a second aspect of this application, this application provides a pulp suction mold for producing pulp molding containers, with a pulp inlet; A molding cavity is configured to fit the main structure and opening structure of the pulp molding container. The pulp inlet is located at the opening of the molding cavity, and the length of the opening of the molding cavity is greater than the length of the opening of the designed pulp molding container. A stepped surface is formed between the pulp inlet and the molding cavity. The stepped surface is used to retain the pulp slurry from the pulp inlet on the stepped surface.

[0009] In one possible implementation, the height of the step surface is 4.5–10 mm.

[0010] In one possible implementation, a metal mesh is provided on the stepped surface to uniformly retain the pulp slurry from the pulp inlet on the stepped surface.

[0011] According to a third aspect of this application, this application provides a molding die for producing pulp molded containers, comprising: A shaping template has a receiving cavity and an inlet communicating with the receiving cavity. The receiving cavity is configured as the main structure for receiving a semi-dry preform of a pulp molding container, and the inlet is configured as the opening structure for receiving the semi-dry preform of the pulp molding container. A shaping component is mounted on the shaping template and is used to shape the opening edge structure of the semi-dry preform. A driving structure drives the shaping component to move towards the shaping template, thereby shaping the opening edge structure of the semi-dry preform.

[0012] In one possible implementation, the shaping component is mounted on the driving structure, which drives the shaping component to move toward the shaping template, thereby shaping the opening edge structure of the semi-dry blank.

[0013] In one possible implementation, the shaping component includes: a movable stop; a guide member, one end of which is disposed on the shaping template or driving structure, and the other end of which is slidably connected to the movable stop, the movable stop moving along the guide member to shape the opening edge structure of the semi-dry blank; and an elastic member, one end of which is fixedly connected to the movable stop, the other end of which faces the shaping template, and the elastic member being used to limit the movable stop.

[0014] In one possible implementation, the shaping mold further includes an extrusion mechanism, which comprises: a high-pressure chamber connected to the output end of the drive structure; a mounting plate fixed to the end face of the high-pressure chamber facing the shaping mold; an elastomer bag, one end of which is fixedly connected to the mounting plate, and the other end of which extends into the main structure of the semi-dry blank; and an air rod, one end of which is fixedly connected to the high-pressure chamber, and the other end of which extends into the elastomer bag. The drive mechanism may be a power-generating component such as a cylinder or a motor.

[0015] In one possible implementation, the shaping mold further includes a heating device disposed on the shaping mold, which heats the semi-dry preform with the flanged structure to form a dried pulp molded container.

[0016] According to a fourth aspect of this application, this application provides a manufacturing mold for a pulp molding container, including the pulp suction mold and the shaping mold described above, wherein the pulp suction mold and the shaping mold cooperate to produce the pulp molding container according to the production process described above.

[0017] According to a fifth aspect of this application, this application provides a pulp molding container, which is manufactured using the shaping mold, the suction mold, or the manufacturing mold described above, or produced by the production process described above, wherein the thickness of the mouth structure of the pulp molding container is 2 mm to 2.5 mm.

[0018] This application provides a pulp suction mold, a shaping mold, a manufacturing mold, a production process for a pulp molded container, and the pulp molded container itself. The production process involves placing the pulp suction mold in pulp slurry, and after suction treatment, obtaining a semi-dry preform. The semi-dry preform includes a main structure and an opening structure, the edge of which has an inwardly turned flange. The semi-dry preform is then placed in the shaping mold, and the opening structure with the inwardly turned flange is shaped to obtain a pulp molded container with an inwardly turned flange at the opening edge. This production process produces... The thickness of the flanged structure at the mouth of the produced pulp molded container is 2mm to 2.5mm. This flanged structure can be used in conjunction with a sealing element to seal the main structure of the pulp molded container. Furthermore, because the suction mold forms an inner flanged structure at the mouth edge of the pulp molded container during the suction process, and then the shaping mold shapes the inner flanged structure, a flat inner flanged structure with a certain thickness is obtained. This not only saves the die-cutting process but also greatly improves the sealing performance of the pulp molded container. Attached Figure Description

[0019] Figure 1 The diagram shown is a structural schematic of a suction mold provided in an embodiment of this application; Figure 2 The diagram shown is a structural schematic of the stepped surface of a suction mold provided in an embodiment of this application; Figure 3 The diagram shown is a structural schematic of the extrusion mechanism and the shaping template of a shaping mold provided in an embodiment of this application; Figure 4 The diagram shown is a structural schematic of the turning component and extrusion structure of a shaping mold provided in an embodiment of this application; Figure 5 The diagram shown is a structural schematic of the heating device and extrusion mechanism of a shaping mold provided in an embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 1. Shaping mold; 11. Shaping template; 111. Receiving cavity; 112. Inlet; 12. Shaping component; 121. Movable stop; 122. Guide component; 123. Elastic component; 13. Extrusion mechanism; 131. High-pressure chamber; 132. Mounting plate; 133. Elastomer bag; 134. Air rod; 14. Drive mechanism; 15. Heating device; 2. Suction mold; 21. Slurry inlet; 22. Forming cavity; 23. Stepped surface; 24. Metal mesh. Detailed Implementation

[0021] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, top, bottom, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0022] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0023] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0024] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will understand that the embodiments described herein can be combined with other embodiments.

[0025] The technical solutions of 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 of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] Pulp molded containers are used to hold and package packaged products. In the molding process of pulp molded containers, the mold and the structure of the pulp molded container are consistent. The wall thickness of the mouth of the pulp molded container is the same as the wall thickness of the main body of the pulp molded container. Its mouth wall thickness does not meet the thickness requirements for heat sealing (2.0mm±0.2mm). When the bottle cap is used to seal the pulp molded bottle, a precise fit cannot be achieved, resulting in a certain gap and poor sealing performance. This leads to the risk of leakage during transportation, sales, storage and end-consumer use. In addition, the wall thickness of the mouth of the prepared pulp molded container is uneven, requiring additional die-cutting process, which is complex and costly.

[0027] Therefore, this application provides a manufacturing process for a pulp molded container. The process involves placing a suction mold 2 into pulp slurry and performing suction treatment to obtain a semi-dry preform of the pulp molded container. The semi-dry preform includes a main structure and a mouth structure, with the edge of the mouth structure having an inwardly turned edge. The semi-dry preform is then placed in a shaping mold, and the mouth structure with the inwardly turned edge is shaped inwards to obtain a pulp molded container with an inwardly turned edge at the mouth.

[0028] In some preferred embodiments, the step of placing the suction mold in the pulp slurry and obtaining a semi-dry preform of the pulp molded container through suction treatment includes: connecting the suction mold 2 to a vacuum device for suction treatment to obtain a semi-dry preform of the pulp molded container with an inwardly flanged opening, wherein the suction treatment time is 5s to 10s; the moisture content of the wet preform is 60% to 80%, the thickness of the wet preform is 2mm to 3mm, and the length of the opening of the wet preform is 1mm to 1.5mm longer than the length of the opening of the forming mold; the formed wet preform is dehydrated at room temperature for 10s to 15s, the dehydration treatment pressure is 2 to 4MPa, and the moisture content of the semi-dry preform after dehydration is 40% to 60%.

[0029] In some preferred embodiments, the step of placing a semi-dry preform in a shaping mold 1 for shaping to obtain a pulp molded container with an inwardly turned-up edge structure includes: placing a semi-dry preform with a moisture content of 40% to 60% in the shaping mold 1, heating the semi-dry preform, and driving the extrusion mechanism 13 or the shaping mold 1 to move in opposite directions by a cylinder, thereby shaping the edge of the mouth structure of the pulp molded container, and thus obtaining a pulp molded container with an inwardly turned-up edge structure at the mouth; wherein, the temperature for heating the semi-dry preform with a moisture content of 40% to 60% is 120°C to 140°C; the heating time is 2 min to 4 min; and the pressure for shaping the semi-dry preform with a moisture content of 40% to 60% is 6 MPa to 10 MPa.

[0030] Figure 1 The diagram shown is a structural schematic of a suction mold provided in an embodiment of this application; Figure 2 The diagram shown is a structural schematic of the stepped surface of a suction mold provided in an embodiment of this application; as shown Figure 1 as well as Figure 2 As shown, the pulp suction mold includes: a pulp inlet 21; a forming cavity 22, configured to accommodate the main structure and opening structure of a pulp molding container; the pulp inlet 21 is located at the opening of the forming cavity 22, and the length of the opening of the forming cavity 22 is greater than the designed length of the opening of the pulp molding container; and a stepped surface 23, forming a step surface 23 between the pulp inlet 21 and the forming cavity 22, which is used to retain the pulp from the pulp inlet on the stepped surface 23. Pulp fibers enter from the pulp inlet 21, pass through the stepped surface 23, and enter the forming cavity 22. Under vacuum, the pulp undergoes suction treatment in the forming cavity to obtain a wet preform of the pulp molding container. The stepped surface 23 can be used to improve the suction thickness at the opening of the pulp molding container, thereby forming an inwardly flanged structure at the edge of the opening.

[0031] Preferably, in order to ensure the uniformity of the wall thickness of the molded wet blank, the length of the slurry inlet 21 is greater than 13 mm.

[0032] In some preferred embodiments, the height of the step surface 23 is 4.5 to 10 mm. By adjusting the height of this step surface 23, the thickness of the slurry absorbed at the edge of the mouth can be improved, thereby increasing the thickness and strength of the bottle mouth after shaping. The width of the step surface needs to be greater than 4.5 mm to ensure the minimum wall thickness of the product.

[0033] In some preferred embodiments, a metal mesh 24 is provided on the stepped surface 23. A layer of stainless steel metal mesh 24 is welded on the stepped surface 23. This not only retains the pulp on the metal mesh 24, but also intercepts the pulp and filters out water. The filtered water is carried away through the groove at the bottom of the mold. Moreover, providing a metal mesh 24 on the stepped surface 23 can make the vacuum flow more uniform and increase the thickness of the entire opening.

[0034] Figure 3 The diagram shown is a structural schematic of the extrusion mechanism and the shaping template of a shaping mold provided in an embodiment of this application; Figure 4 The diagram shown is a structural schematic of the turning component and extrusion structure of a shaping mold provided in an embodiment of this application; Figure 5 The diagram shown is a structural schematic of the heating device and extrusion mechanism of a shaping mold provided in an embodiment of this application. Figures 3-5 As shown, the shaping mold includes: a shaping template 11, which has a receiving cavity and an inlet connected to the receiving cavity. The receiving cavity is configured as the main structure for receiving the wet preform of the pulp molding container, and the inlet is configured as the opening structure for receiving the wet preform of the pulp molding container; a shaping component 12, which is mounted on the shaping template 11 and is used to shape the opening edge structure of the semi-dry preform; and a driving mechanism 14, which is used to drive the shaping component 12 to move toward the shaping template 11, thereby shaping the opening edge structure of the semi-dry preform. This shaping mold shapes the inner flange structure at the mouth of the pulp molded container during the shaping process. Because the inner flange structure fits tightly with the sealing element (such as a bottle cap), the burrs on the inner flange structure are smoothed, making the inner flange structure more compact and eliminating gaps between it and the sealing element. This greatly improves the sealing performance of the pulp molded container mouth. In addition, the shaping process of this mold avoids uneven wall thickness at the mouth of the pulp molded container, and eliminates the need for die-cutting, simplifying the process and reducing costs.

[0035] In some preferred embodiments, the shaping component 12 is mounted on the driving structure 14, which drives the shaping component 12 to move toward the shaping template 1, thereby shaping the opening edge structure of the semi-dry blank.

[0036] In some preferred embodiments, the shaping component 12 includes: a movable stop 121; a guide 122, one end of which is disposed on the shaping template 11 or the driving structure 14, and the other end of which is slidably connected to the movable stop 121, the movable stop 121 moving along the guide 122 for shaping the edge structure of the semi-dry blank; and an elastic member 123, one end of which is fixedly connected to the movable stop 121, the other end of which faces the shaping template 11, the elastic member 123 for limiting the movable stop 121.

[0037] In this embodiment, one end of the guide member 122 is disposed on the shaping template 11 for positioning the guide member 122, and the other end of the guide member 122 is slidably connected to the movable stop 121. The movable stop 121 slides along the guide member 122 toward the shaping template 11 or in the opposite direction of the shaping template 11 to shape the edge of the semi-dry preform of the pulp molding container. Alternatively, one end of the guide member 122 can be disposed on the driving structure 14, and the other end of the guide member 122 is slidably connected to the movable stop 121. The driving structure 14 drives the movable stop 121 to move along the guide member 122 to shape the edge of the semi-dry preform of the pulp molding container.

[0038] In some preferred embodiments, the shaping mold further includes an extrusion mechanism 13, which includes: a high-pressure chamber 131 fixedly connected to the drive structure 14; a mounting plate 132 fixedly attached to the end face of the high-pressure chamber 131 facing the shaping template 1; an elastomer bag 133, one end of which is fixedly connected to the mounting plate 132, and the other end of which extends into the main structure of the semi-dry blank; and an air rod 134, one end of which is fixedly connected to the high-pressure chamber 131, and the other end of which extends into the elastomer bag 133. The air rod has multiple openings (not shown in the figure) to blow gas from the high-pressure chamber 131 into the elastomer bag 133.

[0039] Specifically, one end of the air rod 134 is fixed to the drive mechanism 14, one end of the elastomer bag 133 is fixedly connected to the mounting plate 132 of the extrusion mechanism 13, and the other end of the elastomer bag 133 extends into the main structure of the semi-dry preform. The high-pressure gas in the high-pressure chamber 131 blows the high-pressure gas towards the elastomer bag 133 through the air rod 134, causing the elastomer bag 133 to expand. The elastomer bag 133 is fixed to the mounting plate 132 of the extrusion mechanism 13 and can move back and forth with the direction of movement of the extrusion mechanism.

[0040] In some preferred embodiments, the shaping mold 1 further includes a driving mechanism 14, which is a cylinder (not shown in the figure). The output end of the cylinder is connected to the high-pressure chamber 131. Specifically, the cylinder drives the high-pressure chamber 131 to move. When the cylinder drives the high-pressure chamber 131 to move into the main structure of the semi-dry preform, the high-pressure gas in the high-pressure chamber 131 blows the high-pressure gas towards the elastomer bag 133 through the air rod 134. The elastomer bag 133 expands and squeezes the moisture in the wet preform of the pulp molding container.

[0041] In some preferred embodiments, the drive mechanism 14 can also be placed on the shaping template 11, and the driving mechanism 14 drives the shaping template 11 to move in the direction of the movable stop 121, thereby achieving the shaping treatment of the mouth edge of the semi-dry pulp molded container.

[0042] In some preferred embodiments, the molding die further includes a heating device 15, which is disposed on the molding die 1. The heating device 15 causes the wet preform of the pulp molding container to form a dry pulp molding container. Specifically, when the cylinder drives the high-pressure chamber 131 to move into the main structure of the wet preform, the high-pressure gas in the high-pressure chamber 131 blows the high-pressure gas towards the elastomer bag 133 through the air rod. The elastomer bag 133 expands and squeezes out the moisture in the wet preform of the pulp molding container. At the same time, the heating device 15 dries the moisture in the wet preform of the pulp molding container, thereby forming a pulp molding container with a flanged structure.

[0043] This application provides a mold for manufacturing pulp molded containers, including the above-mentioned pulp suction mold 2 and the above-mentioned shaping mold 1. The pulp suction mold 2 and the shaping mold 1 are used to manufacture pulp molded containers.

[0044] This application provides a pulp molding container, which is manufactured using the above-mentioned suction mold 2 or the above-mentioned shaping mold 1 or the above-mentioned manufacturing mold, or produced by the above-mentioned production process. The thickness of the mouth structure of the pulp molding container is 2mm to 2.5mm, and the thickness of the main body structure of the pulp molding container is 0.8mm to 1.2mm.

[0045] The pulp molding containers disclosed in this application can include, but are not limited to, pulp molding bottles, pulp molding tubes, pulp molding tanks, etc. The following description uses a pulp molding bottle as an example.

[0046] Example 1 The stepped surface 23 of the suction mold 2 is wrapped with a mesh. The width of the stepped surface 23 is 5.5 mm. At the same time, the length of the wet blank bottle mouth is increased by 1 to 1.5 mm. The suction time is 5 to 10 seconds, the dehydration time is 20 to 30 seconds, and the moisture content of the wet blank is 70 to 80%. The suction process forms a wet blank with an inward flange structure at the mouth. Then, the wet blank with the flange structure at the mouth is dehydrated at room temperature for 10 to 15 seconds at a pressure of 2 to 3 MPa to obtain a semi-dry blank with a moisture content of 60% and a bottle mouth thickness of 4 mm.

[0047] The semi-dry preform is placed into the shaping mold 1 for shaping and heat treatment. The heat treatment temperature is 120℃~140℃ and the heating time is 2min~4min. A movable stop 121 is connected to one side of the shaping mold 1. The extrusion mechanism 13 is driven by the driving mechanism 14 to move towards the shaping mold 1, pushing the movable stop 121 towards the shaping mold 1, thereby shaping the edge of the mouth structure of the pulp molded container inward. The shaping pressure is 6MPa~10MPa. After the above process, a pulp molded bottle can be obtained. The bottle mouth thickness of the pulp molded bottle is measured to be 1~1.2mm. The bottle mouth flange of the pulp molded bottle can reach 2~2.5mm. The flange can strengthen the bottle mouth and play a sealing role.

[0048] After heat-sealing the mouth of the pulp molded bottle with heat-sealable aluminum foil, it was placed under a negative pressure of 60 kPa for 1 minute for a sealing test. The test showed that the mouth of the pulp molded bottle had no leakage and no deformation. The mouth of the pulp molded bottle was subjected to a pressure test of ≥300N. The test results showed that the mouth of the pulp molded bottle could withstand a pressure of ≥300N, indicating good pressure resistance. Comparative Example 1 The stepped surface 23 of the suction mold 2 was not covered with a screen. The width of the stepped surface 23 was 4.5 mm. The suction time was 5-10 seconds, and the dehydration time was 20-30 seconds. The moisture content of the resulting wet blank was 70-80%. Then, the formed wet blank was dehydrated at room temperature for 10-15 seconds. The dehydration force was 2-3 MPa to obtain a semi-dry blank with a moisture content of 60% and a bottle mouth thickness of 1.5-2.5 mm. Then, the dehydrated semi-dry preform is placed into the shaping mold 1 for heat treatment. The heat treatment temperature is 140℃ and the heat treatment time is 4min. The pressure for shaping the wet preform is 6MPa~10MPa. After the above process, the pulp molded bottle can be obtained. At this time, the thickness of the bottle mouth of the pulp molded bottle is measured to be 0.6~0.8mm, and no flanging effect is formed.

[0049] Comparative Example 2 The stepped surface 23 of the suction mold 2 is treated with a mesh covering. The width of the stepped surface 23 is 5.5 mm. The suction time is 5-10 seconds, the dehydration time is 20-30 seconds, and the moisture content of the wet blank is 70-80%. Then, the wet blank is dehydrated at room temperature for 10-15 seconds and the dehydration force is 2-3 MPa to obtain a semi-dry blank with a moisture content of 60% and a bottle mouth thickness of 2.5-3.5 mm. Then, the dehydrated semi-dry preform is placed into the shaping mold 1 for heat treatment. The heat treatment temperature is 120℃~140℃ and the heat treatment time is 2min~4min. The pressure for shaping the wet preform is 6MPa~10MPa. After the above process, the pulp molded bottle can be obtained. At this time, the thickness of the bottle mouth of the pulp molded bottle is measured to be 0.8~1mm, and no flanging effect is formed.

[0050] Comparative Example 3 The stepped surface 23 of the suction mold 2 is treated with a mesh covering. The width of the stepped surface 23 is 5.5 mm. The suction time is 5-10 seconds, the dehydration time is 20-30 seconds, and the moisture content of the wet blank is 70-80%. Then, the wet blank is dehydrated at room temperature for 10-15 seconds and the dehydration force is 2-3 MPa to obtain a semi-dry blank with a moisture content of 60% and a bottle mouth thickness of 2.5-3.5 mm. Then, the semi-dry preform is placed into the shaping mold 1 for heat treatment. The heat treatment temperature is 120℃~140℃ and the heat treatment time is 2min~4min. The pressure for shaping the semi-dry preform is 6MPa~10MPa. After the above process, the pulp molded bottle can be obtained. At this time, the thickness of the bottle mouth of the pulp molded bottle is measured to be 1~1.2mm, and no flanging effect is formed.

[0051] Therefore, the pulp suction mold, shaping mold, manufacturing mold, pulp molding container production process, and pulp molding container of this application simplify the formation of the pulp molding container opening while increasing the thickness of the pulp molding container opening, so that the opening edge of the pulp molding container forms a flanged structure, and no die-cutting process is required. This reduces production costs while improving the sealing performance of the pulp molding container opening.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A process for the production of pulp-moulded containers, characterised in that: include: The suction mold is placed in the pulp slurry, and after suction treatment, a semi-dry preform of the pulp molding container is obtained. The semi-dry preform includes a main structure and an opening structure. The opening structure increases in thickness during the suction treatment, forming an inner flange structure. The semi-dry preform is placed in a shaping mold, and the opening structure with an inwardly turned edge is shaped to obtain a pulp molded container with an inwardly turned edge at the opening.

2. The production process according to claim 1, characterized in that, The step of placing the suction mold in the pulp slurry and performing suction treatment to obtain the semi-dry preform of the pulp molding container includes: The pulp suction mold is connected to a vacuum device for pulp suction treatment to obtain a molded wet blank of a pulp molded container with an inwardly turned-up edge structure at the mouth. The pulp suction treatment time is 5s to 10s. The moisture content of the wet blank is 60% to 80%, the thickness of the wet blank is 2mm to 3mm, and the length of the mouth of the wet blank is 1mm to 1.5mm longer than the length of the mouth of the shaping mold. The wet blank is dehydrated in the suction mold at room temperature for 10-15 seconds and at a pressure of 2-4 MPa. The moisture content of the semi-dry blank after dehydration is 40%-60%.

3. The production process according to claim 2, characterized in that, The step of placing the semi-dry preform in a shaping mold and shaping the opening structure with an inwardly turned edge of the semi-dry preform to obtain a pulp molded container with an inwardly turned edge at the opening edge includes: A semi-dry molded blank with a moisture content of 40% to 60% is placed in the shaping mold. The semi-dry molded blank is heated and the extrusion mechanism or the shaping mold is driven by the driving structure to move towards each other, so that the edge of the mouth structure of the pulp molded container is shaped inward, thereby obtaining a pulp molded container with an inwardly turned edge structure at the mouth. The temperature for heat treatment of the semi-dry molded blank with a moisture content of 40% to 60% is 120℃ to 140℃; the heat treatment time is 2 min to 4 min; and the pressure for the shaping treatment of the semi-dry molded blank with a moisture content of 40% to 60% is 6 MPa to 10 MPa.

4. A suction mould for producing a pulp-moulded container, characterised in that The suction mold includes: Slurry inlet; A molding cavity is configured to fit the main body structure and opening structure of the pulp molding container. The pulp inlet is located at the opening of the molding cavity, and the length of the opening of the molding cavity is greater than the length of the opening of the designed pulp molding container. A stepped surface is formed between the pulp inlet and the forming cavity, and the stepped surface is used to retain the pulp from the pulp inlet on the stepped surface.

5. The suctioning mold according to claim 4, wherein The height of the step surface is 4.5–10 mm.

6. The suctioning mold according to claim 5, wherein A metal mesh is provided on the stepped surface to uniformly retain the pulp slurry from the pulp inlet on the stepped surface.

7. A forming mold for producing a pulp molded container, characterized by, include: A shaping template, the shaping template having a receiving cavity and an inlet communicating with the receiving cavity, the receiving cavity being constructed as the main structure for receiving a semi-dry preform of a pulp molding container, and the inlet being constructed as the mouth structure for receiving a semi-dry preform of a pulp molding container. A shaping component is mounted on the shaping template and is used to shape the opening edge structure of the semi-dry blank. A driving structure drives the shaping component to move toward the shaping template, thereby shaping the opening edge structure of the semi-dry blank.

8. The forming mold of claim 7, wherein The shaping component is mounted on the driving structure, and the driving structure drives the shaping component to move towards the shaping template, thereby shaping the opening edge structure of the semi-dry blank.

9. The shaping mold according to any one of claims 7 or 8, wherein the shaping component further comprises: Movable stop; A guide member, one end of which is disposed on the shaping template or driving structure, and the other end of which is slidably connected to the movable stop block. The movable stop block moves along the guide member to shape the opening edge structure of the semi-dry blank. An elastic element, one end of which is fixedly connected to the movable stop, and the other end of which faces the shaping template, is used to limit the movement of the movable stop.

10. The forming mold of claim 7 wherein, The shaping mold further includes an extrusion mechanism, which includes: A high-pressure chamber, which is connected to the output end of the drive structure; A mounting plate is fixed to the end face of the high-pressure chamber facing the shaping mold. An elastomer bag, one end of which is fixedly connected to the mounting plate, and the other end of which extends into the main structure of the semi-dry blank; An air rod, one end of which is fixedly connected to the high-pressure chamber, and the other end of which extends into the elastomer bag.

11. The forming mold of claim 7 wherein, The shaping mold also includes a heating device, which is disposed on the shaping mold. The heating device is used to form a dried pulp molded container from the semi-dry blank with the flange structure.

12. A manufacturing mold for a pulp molded container, characterized by, The molded pulp container includes the pulp suction mold as described in any one of claims 4 to 6 and the shaping mold as described in claims 7 to 11, wherein the pulp suction mold and the shaping mold are used in conjunction with the production process described in any one of claims 1 to 3 to produce the pulp molding container.

13. A pulp molded container characterized by The pulp molded container is manufactured using the pulp suction mold according to any one of claims 4 to 6, the shaping mold according to claims 7 to 11, or the manufacturing mold according to claim 12, or produced using the production process according to any one of claims 1 to 3, wherein the thickness of the mouth structure of the pulp molded container is 2 mm to 2.5 mm.

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