Extrusion-suction mold for forming molded pulp container, mold and use method therefor

Abstract

The present invention relates to the technical field of molded pulp container manufacturing molds, and in particular to an extrusion-suction mold for forming a molded pulp container, a mold and a use method therefor. The present invention overcomes the defects in the prior art such as improper design. The extrusion-suction mold for forming a molded pulp container comprises a first mold body, and the first mold body is provided with a forming air pouch conforming to the shape of the molded pulp container. The extrusion-suction mold for forming a molded pulp container further comprises 1 to N air nozzles that are arranged along a thickness direction of the forming air pouch and used for suctioning the molded pulp container. The present application has the advantage that: a combination of the forming air pouch and the air nozzles can significantly improve production efficiency and reduce production costs.

Description

Extrusion Adsorption Molds, Dies and Their Usage Methods for Molding Pulp Containers Technical Field

[0001] This invention belongs to the field of pulp container manufacturing mold technology, and particularly relates to an extrusion adsorption mold for forming pulp molded containers, the mold, and the method of using it. Background Technology

[0002] Pulp container products include molded pulp containers, and containers include plates, lunch boxes, or cups. Existing pulp container products involve forming a wet preform in the wet preform stage, followed by a hot pressing stage. Because the wet preform of the pulp molded material has a high moisture content, the hot pressing stage requires a long processing time, affecting production efficiency. While some inventors have designed a method to squeeze moisture out of the wet preform by incorporating an airbag within the upper mold, this method requires a robotic arm combined with suction cups to obtain and transfer the pressurized wet preform, which also suffers from low efficiency. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems by providing an extrusion adsorption mold, a die, and a method for using the same for forming pulp molded containers.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions:

[0005] This extrusion adsorption mold for forming pulp molded containers includes a first mold body, on which a forming air bladder shaped like a pulp molded container is provided. The extrusion adsorption mold for forming pulp molded containers further includes 1 to N air nozzles arranged along the thickness direction of the forming air bladder and used to adsorb the pulp molded container. The air nozzles are not in communication with the internal space of the forming air bladder.

[0006] Preferably, the air nozzles are distributed in several and at least partially on the side of the molding airbag that contacts the bottom of the pulp molding container, and the contact end face of the air nozzles is exposed relative to the side of the molding airbag that contacts the bottom of the pulp molding container.

[0007] Preferably, the molded airbag is provided with 1 to N air nozzles arranged along the thickness direction of the molded airbag.

[0008] Preferably, the first mold body has a connecting hole that is sealed and connected to each of the air nozzles.

[0009] Preferably, the air nozzle and the molded airbag are fixedly connected.

[0010] Preferably, as another method, the first mold body is provided with 1 to N air nozzles, and air nozzle insertion holes are provided in the thickness direction of the formed airbag for the second air column to pass through one by one.

[0011] Preferably, the first mold body has a molding convex cavity surface that conforms to the shape of a pulp molding container, and the molding airbag is fixed to the molding convex cavity surface.

[0012] As another option, the first mold body has a molding cavity surface that conforms to the shape of a pulp molding container, the molding airbag is fixed to the molding cavity surface, and an airbag chamber is formed between the molding airbag and the molding cavity surface.

[0013] This application further provides the following application: a mold for a pulp molding container, including a second mold body, the mold for the pulp molding container further including the extrusion adsorption mold for forming the pulp molding container, the first mold body and the second mold body of the extrusion adsorption mold for forming the pulp molding container are interlocked and form a pulp molding container forming cavity inside, the air nozzle is connected to the pulp molding container forming cavity, and the first mold body is connected to a drive mechanism that can drive the first mold body to move up and down and translate.

[0014] Preferably, the second mold body has a recessed cavity, and the first mold body is provided with a molding protrusion that extends into the recessed cavity when the mold is closed, and the molding protrusion has the molding cavity surface.

[0015] This application further provides a method for using a mold for pulp molding containers, the method comprising the following steps:

[0016] S1. A first set amount of gas is introduced into the molding airbag, and the first mold and the second mold are closed to form a pulp molded container in the pulp molded container molding cavity formed inside the first mold and the second mold.

[0017] S2. A second predetermined amount of gas is introduced into the molding airbag in S1 to further compress the pulp molding container;

[0018] S3, the molding airbag in S2 is deflated and the air nozzle is connected to the negative pressure air source and draws air outward. At this time, the air nozzle sucks up the pulp molding container in S2. Then the driving mechanism drives the first mold body and the second mold body to cancel the mold closing and the driving mechanism drives the first mold body to move out of the second mold body.

[0019] S4. The negative pressure gas source in S3 introduces positive pressure gas into the air nozzle, so that the pulp molding container is separated from the air nozzle and the molding air bag.

[0020] Preferably, the gas pressure of the first set amount is defined as the first gas pressure, the gas pressure of the second set amount is defined as the second gas pressure, and the first gas pressure is less than the second gas pressure.

[0021] Preferably, in S1 above, after a first set amount of gas is introduced into the molding airbag, the side of the molding airbag that contacts the bottom of the pulp molding container is located below the contact end face of the air nozzle, and the side of the molding airbag that contacts the bottom of the pulp molding container forms a first drop distance with the contact end face of the air nozzle.

[0022] Preferably, in S2 above, after a second predetermined amount of gas is introduced into the molding airbag, the side of the molding airbag that contacts the bottom of the pulp molding container forms a second drop distance with the contact end face of the air nozzle, and the first drop distance is smaller than the second drop distance.

[0023] Preferably, in S3 above, after the molding airbag is deflated, the side of the molding airbag near the bottom of the pulp molding container is flush with the contact end face of the air nozzle.

[0024] Preferably, as another alternative, in S3 above, after the molding airbag is deflated, the side of the molding airbag near the bottom of the pulp molding container is located above the contact end face of the air nozzle.

[0025] Compared with existing technologies, the advantages of this application are:

[0026] The molding airbag serves multiple purposes, including molding the wet blank of the pulp molded container and squeezing out the moisture from the wet blank, thereby significantly shortening the processing time cycle of the next process (such as hot pressing).

[0027] After the forming airbag is deflated, the air nozzle acts as an adsorbent for the pulp molding container. When the upper mold is opened, the pulp molding container can be taken away and transferred at the same time. This eliminates the need for a separate transfer device with a robotic arm and suction cup, thus significantly reducing equipment manufacturing costs. At the same time, the combination of the forming airbag and the air nozzle can greatly improve production efficiency and reduce production costs. Attached Figure Description

[0028] Figure 1 is a three-dimensional structural diagram of the extrusion adsorption mold for forming pulp molded containers provided by the present invention;

[0029] Figure 2 is a three-dimensional structural diagram of the extrusion adsorption mold for forming pulp molded containers provided by the present invention from another perspective.

[0030] Figure 3 is a side view of the extrusion adsorption mold for forming pulp molded containers provided by the present invention.

[0031] Figure 4 is a bottom view of the extrusion adsorption mold for forming pulp molded containers provided by the present invention.

[0032] Figure 5 is a schematic diagram of the cross-sectional structure along line AA in Figure 4;

[0033] Figure 6 is a schematic diagram of the cross-sectional structure along line BB in Figure 4;

[0034] Figure 7 is a three-dimensional structural diagram of the extrusion adsorption mold for molding pulp molded containers provided by the present invention after removing the molding air bladder.

[0035] Figure 8 is a schematic diagram of the exploded structure of the mold for pulp molding containers provided by the present invention;

[0036] Figure 9 is a schematic diagram of the mold closing state of the mold for pulp molding containers provided by the present invention;

[0037] Figure 10 is a schematic diagram of the mold for pulp molding containers provided by the present invention in the state of not being closed;

[0038] Figure 11 is a schematic diagram of the state of the first mold provided by the present invention after it has moved to the side of the second mold;

[0039] Figure 12 is a schematic diagram of the mold for pulp molding containers provided by the present invention in the state of step S1;

[0040] Figure 13 is a schematic diagram of the mold for pulp molding containers provided by the present invention in step S2.

[0041] Figure 14 is a schematic diagram of the structure of Embodiment Six provided by the present invention.

[0042] In the figure, the components are: first mold body 1, connecting hole 10, molding convex cavity surface 11, molding protrusion 12, annular connecting sealing groove 13, air port 14, molding airbag 2, air nozzle insertion hole 20, folding part 21, pulp molding container 3, pulp molding container molding cavity 30, air nozzle 4, contact end face 40, second mold body 5, driving mechanism 6, transverse driving device 60, lifting driving device 61, first drop distance h1, and second drop distance h2. Detailed Implementation

[0043] The following are specific embodiments of the invention, which are described in conjunction with the accompanying drawings. The technical solution of the invention will be further described, but the invention is not limited to these embodiments. Example 1

[0044] As shown in Figure 1, the extrusion adsorption mold for forming pulp molded containers includes a first mold body 1. When applied to a vertical pulp molding cold press, the first mold body 1 is the upper mold. When applied to a horizontal pulp molding cold press, the first mold body 1 is the left mold or the right mold.

[0045] Taking a vertical pulp molding cold pressing machine as an example, the first mold body 1 in this embodiment is a punch or a die, and it moves vertically up and down and horizontally. In this embodiment, the first mold body 1 is a punch, and the up and down movement can form the extrusion molding of the pulp molding container, while the horizontal translation movement can cause the adsorbed pulp molding container to leave the wet blank forming position and be transferred to the next station.

[0046] Specifically, as shown in Figures 1-4, the first mold body 1 is provided with a molding airbag 2 that conforms to the shape of the pulp molding container 3, that is, the molding airbag 2 conforms to the inner surface of the pulp molding container 3. At least one gas outlet or inlet port 14 is provided on the first mold body 1 or the molding airbag 2. For example, the outlet and inlet can share a single port; alternatively, at least one gas outlet and at least one gas inlet can be provided, both of which can satisfy the requirements for gas inflow and outflow. Further, as shown in Figure 7, the first mold body 1 has a molding convex cavity surface 11 that conforms to the shape of the pulp molding container 3, and the molding airbag 2 is fixed to the molding convex cavity surface 11.

[0047] In the first type, the molded airbag 2 can have an internal airbag cavity, which is a sealed cavity used to contain gas, thereby allowing the molded airbag 2 to inflate. Alternatively, as shown in Figures 6 and 7, the molded airbag 2 and the molded convex surface 11 form the airbag cavity, as long as they are sealed together. For example, this embodiment uses the second type, where the upper side of the molded airbag 2 has an opening, and the lower side of the first mold body 1 has an annular connecting sealing groove 13 that is sealed to the opening. In this case, the interior of the molded airbag 2 and the molded convex surface 11 form the aforementioned airbag cavity. An air vent 14 communicating with the airbag cavity is provided on the first mold body 1. The opening of the molded airbag 2 has a folded portion 21 that engages with the annular connecting sealing groove 13, and the folded portion 21 is sealed to the annular connecting sealing groove 13.

[0048] Secondly, the molding airbag 2 in this embodiment has at least one airbag cavity inside, and each airbag cavity is connected to at least one gas outlet or inlet. When there is more than one airbag cavity, the internal air pressure of all airbag cavities is equal during wet blank molding, so as to ensure the consistency of the extrusion pressure on the wet blank molding and ensure the high consistency of the wet blank molding quality and the moisture extrusion of the wet blank.

[0049] For example, in other preferred embodiments, when there are two airbag cavities, the two airbag cavities can be distributed side by side or front to back. Of course, one of the airbag cavities can also be set as a ring, and the other airbag cavity is located in the inner circle of the ring airbag cavity.

[0050] As shown in Figures 4 and 6, in order to achieve synchronous transfer of the wet preform extrusion molding and the molded pulp container, the extrusion adsorption mold for molding the pulp container in this embodiment also includes 1 to N air nozzles 4 arranged along the thickness direction of the molding airbag 2 and used to adsorb the pulp molded container 3. The number of air nozzles 4 is, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12, etc. The number of air nozzles 4 can be set according to the size of the pulp molded container, and the air nozzles 4 are not connected to the internal space of the molding airbag 2. That is, during the molding extrusion, gas is introduced into the molding airbag 2 to make the molding airbag 2 expand. During this process, the molding extrusion of the wet blank and the moisture extrusion of the wet blank can be completed. After the molding is completed, the molding airbag 2 is deflated. At this time, the air nozzle 4 is under the action of the negative pressure air source, so that the space formed by the air nozzle 4 and the pulp molding container is in a negative pressure state. That is, the air nozzle 4 sucks the pulp molding container, and the first mold body 1 completes the transfer of the pulp molding container under the drive of the drive mechanism 6.

[0051] The air nozzle 4 is fixed axially relative to the first mold body 1 so that the contact end face 40 of the air nozzle 4 is always in a stable position, which facilitates the contact between the molded air bag 2 and the bottom surface of the pulp molded container 3 after the air bag 2 is deflated.

[0052] Taking a lunchbox as an example, a pulp molded container has a bottom and outer peripheral sides. Of course, an edge skirt can also be provided on the open portion of the outer peripheral side away from the bottom. To improve the stability of adsorption, in this embodiment, several, and at least partially, air nozzles 4 are distributed on the side of the molding airbag 2 that contacts the bottom of the pulp molded container 3. Alternatively, some air nozzles 4 can contact and adsorb onto the edge skirt of the lunchbox for more stable adsorption.

[0053] As an optimized structure in this embodiment, when the internal depth of the pulp molding container is shallow, such as a lunch box, as shown in Figure 6, the contact end face 40 of the air nozzle 4 in this embodiment is shaped to the inner bottom surface of the pulp molding container. For example, when the inner bottom surface of the pulp molding container is flat, the contact end face 40 of the air nozzle 4 is an annular flat surface. Only a number of air nozzles 4 adsorbed onto the inner bottom surface of the pulp molding container are required.

[0054] Further, as shown in Figure 4, in this embodiment, several, and at least partially, air nozzles 4 are distributed on the side of the molding airbag 2 that contacts the bottom of the pulp molding container 3. Regarding the specific distribution, for example, some of the air nozzles 4 are distributed in an annular track, while the remaining air nozzles 4 are distributed within the annular track and arranged in a straight line. It can also be understood that the air nozzles 4 on the annular track adhere to the outer edge of the bottom side of the pulp molding container 3, while the remaining air nozzles 4 adhere to the middle area of ​​the bottom side of the pulp molding container 3, to ensure the stability of the adsorption and prevent the pulp molding container 3 from detaching during transfer. Furthermore, concave and convex structures are provided on the side of the molding airbag 2 that contacts the bottom of the pulp molding container 3 and on the inner wall of the pulp molding container 3, respectively. These concave and convex structures form reinforcing ribs on the bottom and inner wall of the pulp molding container 3. That is, the concave and convex structures include several reinforcing rib recesses on the molding airbag 2, or several reinforcing rib protrusions on the molding airbag 2.

[0055] Additionally, as shown in Figure 10, in this embodiment, the air nozzle 4 is connected in parallel to the negative pressure air source via a pipeline. The drive mechanism 6 includes a lifting drive device 61 mounted on the lateral drive device 60. The lateral drive device 60 is, for example, a linear motor assembly, while the lifting drive device 61 is, for example, a lifting hydraulic cylinder or a lifting pneumatic cylinder. Of course, the drive mechanism 6 can be replaced by an industrial robotic arm. Alternatively, the drive mechanism 6 may only include the lifting drive device 61. Example 2

[0056] As shown in Figure 5, based on the above embodiment one, this embodiment further discloses the following: One to N air nozzles 4 are provided on the molding airbag 2, arranged along the thickness direction of the molding airbag 2. That is, the air nozzles 4 are fixed on the molding airbag 2, and it is sufficient to connect the air nozzles 4 to a negative pressure air source. Secondly, connecting holes 10 are provided on the first mold body 1, which are sealed and connected to each of the air nozzles 4. The connecting holes 10 are then connected to the negative pressure air source. Of course, the connecting holes 10 and the air nozzles 4 can also be connected via connecting pipes. Example 3

[0057] As shown in Figure 6, based on the above embodiment one, this embodiment further discloses another solution: one to N air nozzles 4 are provided on the first mold body 1, and air nozzle insertion holes 20 are provided in the thickness direction of the formed airbag 2 for the second air column 41 to pass through. At this time, the air nozzles 4 can be connected to a negative pressure air source. Example 4

[0058] As shown in Figures 6 and 8, this embodiment further discloses a mold for pulp molding containers, including a second mold body 5 and an extrusion adsorption mold for forming pulp molding containers according to Embodiment 1, Embodiment 2, or Embodiment 3. The first mold body 1 and the second mold body 5 of the extrusion adsorption mold for forming pulp molding containers are interlocked and form a pulp molding container forming cavity 30 inside. A plurality of air nozzles 4 are connected to the pulp molding container forming cavity 30. The first mold body 1 is connected to a drive mechanism 6 that can drive the first mold body 1 to move up and down and translate.

[0059] To ensure precise mold closing between the second mold body 5 and the first mold body 1, they are fitted with guide pillars. For example, guide pillars are located on the second mold body 5, while guide pillar holes are provided on the first mold body 1. Before complete mold closing, the upper ends of the guide pillars are inserted into the guide pillar holes to achieve precise alignment and mold closing. After the first mold body 1 opens relative to the second mold body 5, the guide pillars completely disengage from the guide pillar holes, allowing the first mold body 1 to be driven for translation.

[0060] Secondly, the second mold body 5 in this embodiment is a concave mold. For example, the second mold body 5 has a recessed cavity, and the first mold body 1 is provided with a forming protrusion 12 that extends into the recessed cavity when the mold is closed, and the forming protrusion 12 has a forming convex cavity surface 11. The forming airbag 2 is fixed to the forming convex cavity surface 11, so that forming extrusion processing can be realized. Example 5

[0061] As shown in Figures 1-13, this embodiment further provides a method for using a mold for a pulp molding container based on Embodiment 4. The method includes the following steps:

[0062] S1. A first predetermined amount of gas is introduced into the molding airbag 2, and the first mold 1 and the second mold 5 are closed to form a pulp molding container 3 in the pulp molding container molding cavity 30 formed inside the first mold 1 and the second mold 5. In this step, as shown in FIG12, after the first predetermined amount of gas is introduced into the molding airbag 2, the side of the molding airbag 2 that contacts the bottom of the pulp molding container 3 is located below the contact end face 40 of the air nozzle 4, and the side of the molding airbag 2 that contacts the bottom of the pulp molding container 3 forms a first drop distance h1 with the contact end face 40 of the air nozzle 4.

[0063] S2. A second set amount of gas is introduced into the molding airbag 2 in S1 to further compress the pulp molding container 3. In this step, as shown in Figure 13, after the second set amount of gas is introduced into the molding airbag 2, the side of the molding airbag 2 that contacts the bottom of the pulp molding container 3 forms a second drop distance h2 with the contact end face 40 of the air nozzle 4, and the first drop distance h1 is smaller than the second drop distance h2.

[0064] Specifically, in this embodiment, the pressure of the first set amount of gas is defined as the first pressure, and the pressure of the second set amount of gas is defined as the second pressure, with the first pressure being lower than the second pressure. The effect of the second pressure is to increase the density of the wet pulp molding container 3, thereby squeezing out excess water.

[0065] S3, the molding airbag 2 in S2 is deflated and the air nozzle 4 is connected to the negative pressure air source and draws air out. At this time, the air nozzle 4 sucks the pulp molding container 3 in S2. Then the drive mechanism 6 drives the first mold body 1 and the second mold body 5 to cancel the mold closing and the drive mechanism 6 drives the first mold body 1 to move to the outside of the second mold body 5.

[0066] S4, so that the negative pressure gas source in S3 introduces positive pressure gas into the air nozzle 4, so that the pulp molding container 3 is separated from the air nozzle 4 and the molding air bag 2.

[0067] S5. The pulp molded container 3, which was separated from the air nozzle 4 and the molding air bag 2 in S4, is sent into the hot pressing mold. The hot pressing mold performs the hot pressing operation to obtain the hot-pressed pulp molded container 3.

[0068] S6. Post-processing: The hot-pressed pulp molded container 3 is trimmed and packaged sequentially.

[0069] As the first option, in S3 above, when the molding airbag 2 deflates, the side of the molding airbag 2 near the bottom of the pulp molding container 3 is flush with the contact end face 40 of the air nozzle 4.

[0070] As a second option, when the molding airbag 2 deflates, the side of the molding airbag 2 closest to the bottom of the pulp molding container 3 is positioned above the contact end face 40 of the air nozzle 4. That is, the contact end face 40 is exposed and protrudes relative to the side of the molding airbag 2 that contacts the bottom of the pulp molding container 3. Example 6

[0071] As shown in Figure 14, based on the above embodiments, when the pulp molding container 3 is a container with a relatively deep interior, such as a pulp molding cup, the pulp molding cup includes a cup body with a cup bottom and an outward-turned flange on the drinking spout side of the cup body. In this embodiment, several air nozzles 4 adsorbed to the bottom of the cup and several air nozzles 4 adsorbed to the outward-turned flange are also provided, so that the pulp molding cup can be adsorbed by the air nozzles 4 provided on the first mold body 1 after the wet blank is formed, and the transfer is completed simultaneously. Example 7

[0072] Based on the above embodiment one, the main difference between this embodiment and embodiment one is that: in this embodiment, the first mold body 1 has a molding cavity surface that conforms to the shape of the pulp molding container 3, the molding airbag 2 is fixed to the molding cavity surface, and an airbag chamber is formed between the molding airbag 2 and the molding cavity surface. That is, at this time, the first mold body 1 is a concave mold, while the second mold body 5 is a convex mold. At this time, the air nozzle 4 sucks onto the outer bottom surface of the pulp molding container 3.

[0073] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An extrusion suction mold for forming a pulp molded container, comprising a first mold body (1), characterized in that, The first mold body (1) is provided with a molding airbag (2) that is similar to a pulp molding container (3). The extrusion adsorption mold for molding the pulp molding container also includes 1 to N air nozzles (4) arranged along the thickness direction of the molding airbag (2) and used to adsorb the pulp molding container (3).

2. The extrusion suction mold for forming a pulp molded container according to claim 1, characterized by The air nozzles (4) are distributed in several and at least partially on the side of the molding airbag (2) that contacts the bottom of the pulp molding container (3), and the contact end face (40) of the air nozzles (4) is exposed relative to the side of the molding airbag (2) that contacts the bottom of the pulp molding container (3).

3. The extrusion suction mold for forming a pulp molded container according to claim 1, wherein The molded airbag (2) is provided with 1 to N air nozzles (4) arranged along the thickness direction of the molded airbag (2).

4. The extrusion suction mold for forming a pulp molded container according to claim 3, characterized in that, The first mold (1) has a connecting hole (10) that is sealed and connected to the air nozzle (4).

5. The extrusion suction mold for forming a pulp molded container according to claim 3, wherein The air nozzle (4) and the molded airbag (2) are fixedly connected.

6. The extrusion suction mold for forming a pulp-molded container according to Claim 1, wherein The first mold body (1) is provided with 1 to N air nozzles (4), and the molded air bag (2) is provided with air nozzle insertion holes (20) in the thickness direction for the second air column (41) to pass through.

7. The extrusion suction mold for forming a pulp-molded container according to Claim 1, wherein The first mold body (1) has a molding convex surface (11) that is shaped like a pulp molding container (3), the molding airbag (2) is fixed to the molding convex surface (11) and an airbag chamber is formed between the molding airbag (2) and the molding convex surface (11).

8. The extrusion suction mold for forming a pulp molded container according to claim 1, wherein The first mold body (1) has a molding cavity surface that is similar to that of a pulp molding container (3), the molding airbag (2) is fixed to the molding cavity surface and an airbag chamber is formed between the molding airbag (2) and the molding cavity surface.

9. A mould for pulp-moulded containers, comprising a second mould body (5), characterised in that The mold for the pulp molding container further includes the extrusion adsorption mold for forming the pulp molding container as described in any one of claims 1-8. The first mold body (1) and the second mold body (5) of the extrusion adsorption mold for forming the pulp molding container are interlocked and form a pulp molding container forming cavity (30) inside. The air nozzle (4) is connected to the pulp molding container forming cavity (30). The first mold body (1) is connected to a drive mechanism (6) that can drive the first mold body (1) to move up and down and / or translate.

10. The mold for pulp-molded containers according to claim 9, characterized by The second mold body (5) has a recessed cavity, and the first mold body (1) is provided with a molding protrusion (12) that extends into the recessed cavity when the mold is closed, and the molding protrusion (12) has the molding protrusion surface (11).

11. The method of using a mold for pulp-molded containers according to claim 9, wherein The method of use includes the following steps: S1. A first set amount of gas is introduced into the molding airbag (2), and the first mold (1) and the second mold (5) are closed to form a pulp molded container (3) in the pulp molding container molding cavity (30) formed inside the first mold (1) and the second mold (5). S2. A second set amount of gas is introduced into the molding airbag (2) in S1 to further compress the pulp molding container (3). S3, the molding airbag (2) in S2 is deflated and the air nozzle (4) is connected to the negative pressure air source and draws air outward. At this time, the air nozzle (4) sucks up the pulp molding container (3) in S2. Then the driving mechanism (6) drives the first mold body (1) and the second mold body (5) to cancel the mold closing. S4, so that the negative pressure gas source in S3 introduces positive pressure gas into the air nozzle (4) so ​​that the pulp molding container (3) is separated from the air nozzle (4) and the molding air bag (2).

12. The method of using a mold for pulp-molded containers according to claim 11, wherein The first set amount of gas pressure is defined as the first gas pressure, and the second set amount of gas pressure is defined as the second gas pressure. The first gas pressure is less than the second gas pressure.

13. The method of using a mold for pulp-molded containers according to claim 11, wherein In S1 above, after a first set amount of gas is introduced into the molding airbag (2), the side of the molding airbag (2) that contacts the bottom of the pulp molding container (3) is located below the contact end face (40) of the air nozzle (4), and the side of the molding airbag (2) that contacts the bottom of the pulp molding container (3) forms a first drop distance (h1) with the contact end face (40) of the air nozzle (4).

14. The method of using a mold for pulp-molded containers according to claim 13, wherein In the above-mentioned S2, after the second set amount of gas is introduced into the molding airbag (2), the side of the molding airbag (2) that contacts the bottom of the pulp molding container (3) forms a second drop distance (h2) with the contact end face (40) of the air nozzle (4), and the first drop distance (h1) is smaller than the second drop distance (h2).

15. The method of using a mold for pulp-molded containers according to claim 11, wherein In S3 above, after the molding airbag (2) is deflated, the side of the molding airbag (2) near the bottom of the pulp molding container (3) is flush with the contact end face (40) of the air nozzle (4).

16. The method of using a mold for pulp-molded containers according to claim 11, wherein In S3 above, after the molding airbag (2) is deflated, the side of the molding airbag (2) near the bottom of the pulp molding container (3) is located above the contact end face (40) of the air nozzle (4).

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