Hot-pressing shaping mold and production line for molded pulp packaging products

Abstract

The utility model relates to a hot-pressing shaping die for a molded pulp packaging product. The defects of unreasonable design and the like in the prior art are overcome. The hot-pressing shaping mold for the paper pulp molding packaging product comprises a hot-pressing shaping concave mold for at least forcing the outer diameter of the original side wing wall thickness of a paper pulp molding wet blank product to be kept unchanged, and a shaping internal expanding mold which is matched with the hot-pressing shaping concave mold and forms a hot-pressing shaping profiling cavity for accommodating the paper pulp molding wet blank product, the shaping internal expansion die applies radial internal expansion force from inside to outside to the original side wing wall thickness, and the radial internal expansion force enables the original side wing wall thickness to be compressed and thinned to the set side wing wall thickness; and when the original side wing wall thickness is forced to be compressed and thinned by the radial internal expansive force, at least part of the inner wall of the original side wing wall thickness is shaped in the direction opposite to the radial internal expansive force to form an inward protrusion. The method has the advantages that the inner convex structure is shaped in the hot-pressing shaping stage, the risk that the inner diameter of the inner convex structure is further enlarged during post-treatment processing demolding can be prevented, and a molded pulp packaging product has better fastening tightness.

Description

Technical Field

[0001] The utility model belongs to the technical field of pulp molded products, in particular to a hot pressing shaping mold and a production line for pulp molded packaging products. Background Art

[0002] Pulp molded packaging products include pulp molded cup lids. The inner wall of the side wing of the existing pulp molded cup lids is provided with an inner convex buckle during wet blank molding, and the inner convex buckle is buckled on the open mouth of the cup body to prevent the pulp molded cup lid from falling off. However, this method is not conducive to subsequent demoulding during hot pressing shaping. During demoulding, the inner diameter of the inner convex buckle increases, which greatly reduces the buckling tightness with the cup body and reduces production efficiency.

[0003] Of course, some utility model inventors have designed a molding method in which the outer wall of the side wing is rolled or spun inward or mechanically pressed inward after the pulp molded cup lid is hot-pressed and fixed, such as CN200910041616.2, a manufacturing process for a disposable cup lid and a cup lid made by the process, the specific steps of which are raw material beating - batching - molding - hot-pressing shaping - trimming and punching - pressing the inverted hook groove. Although the product terminal has a structure with an inner convex buckle on the inner wall of the side wing, the above scheme will destroy the structural strength of the side wing, affect the final buckle tightness with the cup body, and the added step of pressing the inverted hook groove will delay the production cycle and affect production efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a hot pressing shaping mold and production line for pulp molded packaging products that can solve the above technical problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The molded pulp packaging article has a set side wing wall thickness.

[0007] The hot pressing shaping mold for pulp molded packaging products has a set side wing wall thickness, the hot pressing shaping mold comprises a hot pressing shaping concave mold for forcing at least the outer diameter of the original side wing wall thickness of the pulp molded wet embryo product to remain unchanged, the hot pressing shaping mold further comprises a shaping inner expansion mold which cooperates with the hot pressing shaping concave mold and forms a hot pressing shaping profiling cavity for accommodating the pulp molded wet embryo product, the shaping inner expansion mold applies a radial inner expansion force from inside to outside to the original side wing wall thickness, and the radial inner expansion force compresses and thins the original side wing wall thickness to the set side wing wall thickness; and

[0008] When the radial inward expansion force forces the original flank wall thickness to be compressed and thinned, at least a portion of the inner wall of the original flank wall thickness is shaped to be convex inwardly in a direction opposite to the radial inward expansion force.

[0009] In the hot pressing and shaping die of the above-mentioned pulp molding packaging product, the shaping inner expanding die has an inner convex forming groove, and the inner convex is formed in the inner convex forming groove. The inner convex forming groove is an annular groove.

[0010] In the hot pressing and shaping die of the above-mentioned pulp molding packaging product, an inclined inner expanding guiding mechanism for radially expanding the shaping inner expanding die is provided between the shaping inner expanding die and the hot pressing and shaping female die.

[0011] In the hot pressing and shaping die of the above-mentioned pulp molding packaging product, the shaping inner expanding die moves up and down relative to the die base in the vertical direction, and one side of the shaping inner expanding die away from the hot pressing and shaping female die is connected to the hot pressing and shaping female die through an elastic component.

[0012] In the hot pressing and shaping die of the above-mentioned pulp molding packaging product, the shaping inner expanding die includes a guiding displacement outer die that is at least partially slidably matched with the die base, and a plurality of inner expanding dies that are at least partially received in the guiding displacement outer die and are evenly distributed in a circumferential manner. A transverse spring is provided between the outer side of the inner expanding die and the guiding displacement outer die, and a top die placed on the top of the inner expanding die is also included.

[0013] In the hot pressing and shaping die of the above-mentioned pulp molding packaging product, the inclined inner expanding guiding mechanism includes a frustum of a cone fixed to the die base, and an inclined mating surface that coincides with the outer wall of the frustum of the cone is provided on the inner wall of the inner expanding die.

[0014] In the hot pressing and shaping die of the above-mentioned pulp molding packaging product, at least a part of the guiding displacement outer die is received in the guiding groove of the die base, and the shaping inner expanding die is linearly slidably matched with the guiding groove.

[0015] In the hot pressing and shaping die of the above-mentioned pulp molding packaging product, a receiving groove is provided in the upper part of the guiding displacement outer die, and at least a part of the inner expanding die is located in the receiving groove.

[0016] In the hot pressing and shaping die of the above-mentioned pulp molding packaging product, a plurality of demolding air channels with open upper ends are provided inside the top die and / or the inner expanding die, and the demolding air channels are communicated with a gas source.

[0017] The present application also provides a production line for pulp molding packaging products, and the production line includes the hot pressing and shaping die of the pulp molding packaging products.

[0018] Compared with the existing technology, the advantages of the present application are as follows:

[0019] During the hot pressing and shaping stage, an inner convex structure is formed, which can prevent the risk of further expansion of the inner diameter of the inner convex during demolding in post-processing, making the pulp molding packaging product have better fastening tightness.

[0020] During the hot pressing and shaping stage, an inner convex structure is formed, which can simplify the production process. For example, the separate pressing of reverse hooks after hot pressing and forming can be omitted, and it can also avoid the risk of further expansion of the inner diameter of the inner convex during demolding in steps such as hot pressing and shaping directly from wet blanks, improving production efficiency and ensuring stable product quality.

[0021] During the hot pressing and shaping stage, an inner convex structure is formed, which can prevent the phenomenon of poor strength of the side wall thickness caused by, for example, spinning, rolling or pressing reverse hooks. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the change of the pulp molding packaging product obtained after hot pressing and shaping the pulp molding wet blank provided by the present utility model;

[0023] Figure 2 It is a process flow chart of the inner convex forming process provided by the present utility model;

[0024] Figure 3 It is a schematic diagram of the structure of the hot pressing and shaping die provided by the present utility model;

[0025] Figure 4 is Figure 3 The enlarged structure schematic diagram of part A in

[0026] Figure 5 It is a process flow chart of the production process of the pulp molding packaging product provided by the present utility model;

[0027] Figure 6 It is a schematic diagram of the open die state of the hot pressing and shaping die provided by the present utility model;

[0028] Figure 7 It is a schematic diagram of the state of the pulp molding wet blank sleeved on the shaping inner expansion die provided by the present utility model;

[0029] Figure 8 It is a schematic diagram of the closed die state of the hot pressing and shaping die provided by the present utility model;

[0030] Figure 9 It is a schematic diagram of the re-open die state of the hot pressing and shaping die provided by the present utility model;

[0031] Figure 10 It is a schematic diagram of the fully open die state of the hot pressing and shaping die provided by the present utility model.

[0032] In the figure, the pulp molding wet blank product Z0, the original flank wall thickness Z01, the top Z02, the transverse part Z03, the pulp molding packaging product Z1, the flank wall thickness Z10, the inner convex Z11, the shaping inner expansion mold 1, the inner convex forming groove 1a, the guiding displacement outer mold 10, the first blind hole 100, the accommodating groove 101, the third blind hole 102, the inner expansion mold 11, the transverse spring 12, the fourth blind hole 120, the top mold 13, the demolding air channel 130, the extension part 131, the second through hole 132, the transverse air path 133, the hot pressing and shaping concave mold 2, the mold base 3, the guiding groove 30, the second blind hole 300, the elastic component 31, the frustum 32, the through hole 320, the first through hole 33, the cylindrical part 330. Detailed implementation manners

[0033] The following are specific embodiments of the utility model and, in conjunction with the accompanying drawings, further describe the technical solutions of the utility model, but the utility model is not limited to these embodiments.

[0034] As Figure 1 shown, the pulp molding packaging product Z1 has a set flank wall thickness Z10, and there is an inner convex Z11 on the inner wall of the set flank wall thickness Z10. The inner convex Z11 can be a whole ring structure or several arc structures distributed in a circumferential manner.

[0035] The pulp molding packaging product Z1 is further introduced below by taking the pulp molding cup lid as an example:

[0036] Embodiment 1

[0037] As Figure 1 and Figure 3 shown, the hot pressing and shaping die of the pulp molding packaging product is used to perform hot pressing and shaping on the pulp molding wet blank product Z0 and obtain the inner convex Z11.

[0038] The hot pressing and shaping die includes the hot pressing and shaping concave mold 2 and the shaping inner expansion mold 1 that cooperates with the hot pressing and shaping concave mold 2 to form a hot pressing and shaping profiling cavity for accommodating the pulp molding wet blank product Z0.

[0039] The inner convex forming process of the pulp molding packaging product is mainly used to manufacture the inner convex Z11 and is in the hot pressing and shaping stage.

[0040] Different from the prior art, the inner convex Z11 in this embodiment is obtained by hot pressing and shaping, and the finished product can be directly obtained after hot pressing and shaping, which can completely solve the above-mentioned many problems in the prior art.

[0041] Specifically, as Figures 1 - 3 shown, the inner convex forming process of this embodiment includes the following steps:

[0042] At least force the outer diameter of the original flank wall thickness Z01 of the pulp molding wet blank product Z0 to remain unchanged; in the wet blank state, the thickness of the original flank wall thickness Z01 is greater than the set flank wall thickness Z10.

[0043] The above-mentioned unchanged outer diameter limit adopts the hot pressing and shaping concave die 2, and the hot pressing and shaping concave die 2 can limit the outer contour surface of the pulp molding wet blank product Z0, so as to enable the following shaping compression and thinning processing of the original flank wall thickness Z01.

[0044] Secondly, make the pulp molding wet blank product Z0 sleeved on the shaping inner expanding die 1. The shaping inner expanding die 1 is a hot pressing and shaping inner expanding convex die. At this time, the shaping inner expanding die 1 is in a radially contracted state to facilitate the sleeving of the pulp molding wet blank product Z0. The outer wall of the shaping inner expanding die 1 has at least a matching contact surface that matches the original flank wall thickness Z01, and the shaping inner expanding die 1 applies a radially inward expanding force from the inside to the outside to the original flank wall thickness Z01. The application of the radially inward expanding force can make the original flank wall thickness Z01 thinner. At the same time, it can also make the axis line of the pulp molding wet blank product Z0 passively coincide with the axis line of the shaping inner expanding die 1, and finally make the original flank wall thickness Z01 have a uniform thickness. The radially inward expanding force compresses and thins the original flank wall thickness Z01 to the set flank wall thickness Z10;

[0045] The application direction of the radially inward expanding force is in a plane perpendicular to the axis line of the pulp molding wet blank product Z0. When the radially inward expanding force forces the original flank wall thickness Z01 to be compressed and thinned, at least part of the inner wall of the original flank wall thickness Z01 is shaped into an inner convex Z11 in the direction opposite to the radially inward expanding force. Here, it is explained that: there is an inner convex forming cavity reserved between the inner wall of the original flank wall thickness Z01 and the shaping inner expanding die 1. Because the wall thickness becomes thinner during shaping, part of the material of the original flank wall thickness Z01 is squeezed into the inner convex forming cavity, and then the inner convex Z11 is shaped.

[0046] Specifically: as Figure 4 shown, the shaping inner expanding die 1 has an annular inner convex forming groove 1a, and the inner convex Z11 is formed in the inner convex forming groove 1a. The unilateral cross-section of the inner convex forming groove 1a is C-shaped or U-shaped or V-shaped, and of course it can also be semi-circular. The inner convex forming groove 1a is at least two arc-shaped grooves centered on the axis line of the shaping inner expanding die 1 and distributed in a circumferential manner.

[0047] Secondly, after the shaping inner expanding die 1 is radially contracted, it forces the inner convex forming groove 1a to disengage from the inner convex Z11. This structure can facilitate demolding to prevent the inner diameter of the inner convex Z11 from expanding during demolding.

[0048] As Figure 3As shown, the shaping inner expansion mold 1 and the hot-pressing shaping female mold 2 cooperate with each other to form a hot-pressing shaping profiling cavity for accommodating the pulp molding wet blank product Z0. During this process of compression and thinning, the shaping inner expansion mold 1 expands radially, causing the shaping inner expansion mold 1 to have a radial inner expansion force. The outward expansion of the radial inner expansion force compresses and thins the original flank wall thickness Z01.

[0049] The shaping inner expansion mold 1 moves up and down relative to the mold base 3 in the vertical direction. One side of the shaping inner expansion mold 1 away from the hot-pressing shaping female mold 2 and the hot-pressing shaping female mold 2 are connected by an elastic component 31. Specifically, at least part of the shaping inner expansion mold 1 is accommodated in the guiding groove 30 of the mold base 3, that is, the shaping inner expansion mold 1 and the guiding groove 30 are in linear sliding fit to achieve the displacement of the shaping inner expansion mold 1. One side of the shaping inner expansion mold 1 away from the hot-pressing shaping female mold 2 and the bottom of the guiding groove 30 are connected by an elastic component 31. The elastic telescopic direction of the elastic component 31 is the displacement direction of the shaping inner expansion mold 1.

[0050] The functions of the hot-pressing shaping female mold 2 are as follows:

[0051] The elastic component 31 forces the shaping inner expansion mold 1 away from the bottom of the guiding groove 30, that is, there is a gap between the bottom surface of the shaping inner expansion mold 1 and the bottom of the guiding groove 30 at this time. The hot-pressing shaping female mold 2 is driven by power to close the mold with the shaping inner expansion mold 1. At this time, the pulp molding wet blank product Z0 is received in the hot-pressing shaping profiling cavity. As the hot-pressing shaping female mold 2 continuously descends, the elastic component 31 is continuously elastically compressed at this time. During this process, the shaping inner expansion mold 1 and the hot-pressing shaping female mold 2 can heat and dry the pulp molding wet blank product Z0, and compress and thin the wall thickness of the pulp molding wet blank product Z0, that is, hot-pressing shaping.

[0052] As Figure 1 and Figure 3 shown, the pulp molding wet blank product Z0 includes a top Z02 and an original flank wall thickness Z01 connected to the top Z02. Of course, the original flank wall thickness Z01 has a transverse part Z03 that is parallel or approximately parallel to the top Z02. When the hot-pressing shaping female mold 2 closes the mold with the shaping inner expansion mold 1 and continuously compresses the elastic component 31, the hot-pressing shaping female mold 2 causes the shaping inner expansion mold 1 to expand radially outward through an inclined inner expansion guiding mechanism. Preferably, an inclined inner expansion guiding mechanism is provided between the shaping inner expansion mold 1 and the mold base 3 to cause the shaping inner expansion mold 1 to expand radially outward. That is, the mold closing movement of the hot-pressing shaping female mold 2 can drive the shaping inner expansion mold 1 to compress and thin the thickness of the original flank wall thickness Z01 in the radial direction, and to compress and thin the thickness of the top Z02 and the transverse part Z03. The wall thickness of the compressed and thinned pulp molding packaging product Z1 is uniform, except for the local thickness of the inner convex Z11.

[0053] After hot press shaping is completed, subsequent post-processing operations such as trimming can be carried out. For post-processing, it is not necessary to fit the pulp molding packaging product Z1 into the corresponding profiling jig again, thus eliminating the risk of the inner diameter of the inner convex Z11 being enlarged twice or multiple times.

[0054] Specifically, as Figure 1 and Figure 3 shown, the structure of the shaping inner expansion mold 1 includes the following:

[0055] The guiding displacement outer mold 10, at least part of the guiding displacement outer mold 10 is in sliding fit with the guiding groove 30, and the elastic component 31 includes several springs. One end of the spring acts on the guiding displacement outer mold 10, and the other end of the spring acts on the guiding groove 30. In order to enable the spring to exert a stable elastic force, a first blind hole 100 is provided at the bottom of the guiding displacement outer mold 10, and a second blind hole 300 is provided at the bottom of the guiding groove 30. One end of the spring extends into the first blind hole 100 and the end of the spring acts on the bottom of the first blind hole 100. The other end of the spring extends into the second blind hole 300 and the end of the spring acts on the bottom of the second blind hole 300. At this time, the guiding displacement outer mold 10 can move relative to the guiding groove 30. When the spring is not compressed, the shaping inner expansion mold 1 is in an unexpanded state at this time. When the spring is compressed to a set length (when the bottom surface of the guiding displacement outer mold 10 contacts the bottom of the guiding groove 30), the shaping inner expansion mold 1 is expanded in place, completing the processing of compressing and thinning the wall thickness of the pulp molding wet blank product Z0.

[0056] Several inner expansion molds 11 evenly distributed in a circle and at least partially received in the guiding displacement outer mold 10. Further, a receiving groove 101 is provided at the upper part of the guiding displacement outer mold 10, and at least part of the inner expansion mold 11 is in the receiving groove 101. Preferably, the bottom of the receiving groove 101 is in sliding contact with the bottom surface of the inner expansion mold 11 to achieve the radial displacement stability of the inner expansion mold 11. Secondly, a transverse spring 12 is provided between the outer side of the inner expansion mold 11 and the guiding displacement outer mold 10. For example, the outer end of the transverse spring 12 extends into the third blind hole 102 on the vertical groove wall of the receiving groove 101, and the inner end of the transverse spring 12 extends into the fourth blind hole 120 on the outer side of the inner expansion mold 11. The corresponding ends of the transverse spring 12 abut against the bottom of the third blind hole 102 and the bottom of the fourth blind hole 120.

[0057] That is, each inner expansion mold 11 is respectively paired with at least one transverse spring 12. The transverse spring 12 and the elastic component 31 are in a perpendicular distribution state. That is, the transverse spring 12 provides a transverse elastic force, and the elastic component 31 provides a vertical elastic force. The elastic force of the transverse spring 12 can enable the inner expansion mold 11 to radially reset inward after radially expanding outward. At the same time, the transverse spring 12 can also play a buffering role when the inner expansion mold 11 radially expands outward, so that the inner expansion mold 11 expands smoothly.

[0058] In addition, the receiving groove 101 is a stepped groove. The bottom groove wall of the receiving groove 101 parallel to the transverse spring 12 is in sliding contact with the internal expansion mold 11, while the side groove wall of the receiving groove 101 perpendicular to the transverse spring 12 serves to limit the extreme outward displacement of the internal expansion mold 11. And

[0059] The top mold 13 placed on the top of the internal expansion mold 11 is shaped like the top Z02. The internal expansion mold 11 slidably supports the bottom surface of the top mold 13. That is to say, the top mold 13 will not move radially, etc. The top mold 13 will only move up and down to compress and thin the wall thickness of the top Z02.

[0060] Such as Figure 1 and Figure 3 shown, the inclined internal expansion guiding mechanism includes the following structure:

[0061] The frustum 32 fixed to the guiding groove 30. The frustum 32 is fixed in the central area of the guiding groove 30. The outer wall of the frustum 32 has a conical surface, and the inner wall of the internal expansion mold 11 has an inclined mating surface that fits with the outer wall of the frustum 32. When the pulp molding wet blank product Z0 is in the state of not being compressed and thinned, the upper side of the inclined mating surface extends beyond the top of the frustum 32 (due to the elastic force of the elastic component 31). When the hot pressing and shaping concave mold 2 moves downward, at this time, the internal expansion mold 11 moves downward relative to the frustum 32. During this displacement process, the wall thickness of the pulp molding wet blank product Z0 is continuously compressed and thinned. At the same time, when the bottom of the guiding displacement outer mold 10 contacts the bottom of the guiding groove 30 and the outer wall of the internal expansion mold 11 abuts against the side groove wall of the receiving groove 101, at this time, the internal expansion mold 11 is in the position where the internal expansion is in place and cannot continue to move radially outward. After the internal expansion mold 11 stays for at least a certain period of time, the hot pressing and shaping concave mold 2 resets upward, and at this time, the internal expansion mold 11 also resets upward. Since the radial inward contraction of the internal expansion mold 11 can prevent the internal expansion mold 11 from expanding the inner diameter of the inner convex Z11 during demolding, and because the inner convex Z11 is shaped during hot pressing and shaping, the risk of the inner diameter of the inner convex Z11 being expanded again during post-processing can be eliminated.

[0062] In order to facilitate the demolding of the top Z02 from the top mold 13, a number of demolding air channels 130 with open upper ends are provided inside the top mold 13 and / or the internal expansion mold 11. The demolding air channels 130 are connected to a gas source. When the internal expansion mold 11 is separated from the inner convex Z11, at this time, the demolding air channels 130 perform the action of introducing air pressure to demold the top Z02 from the top mold 13.

[0063] In addition, an extension portion 131 extending downward is provided at the center of the lower surface of the top mold 13. A through hole 320 is provided axially in the frustum 32. The extension portion 131 is columnar and inserted into the through hole 320. The extension portion 131 and the through hole 320 are in clearance fit. A first through hole 33 is provided in the mold base 3. A second through hole 132 communicating with the first through hole 33 is provided axially in the extension portion 131. The lower end of the demolding air passage 130 is respectively communicated with the transverse air passage 133, and the transverse air passage 133 is communicated through an air supply pipeline penetrating into the first through hole 33 and the second through hole 132. And the transverse air passage 133 is at least one path and both ends of the transverse air passage 133 are also communicated with the outside. The transverse air passage 133 and the demolding air passage 130 can perform demolding operations in different orientations.

[0064] As another way of the air supply pipeline, a cylindrical portion 330 is provided at the upper orifice of the first through hole 33. The extension portion 131 and the cylindrical portion 330 are sleeved with each other and are movably sealed. For example, the extension portion 131 is inserted into the cylindrical portion 330, and the two are in dynamic sealing sliding fit. For example, in the way of setting a sealing ring, at this time, as long as a gas source is provided at the lower orifice of the first through hole 33, blowing demolding can be realized.

[0065] Embodiment 2

[0066] Based on Embodiment 1, the following content is further disclosed in this embodiment:

[0067] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , the production process of the pulp molded packaging product includes the following steps:

[0068] S1. Wet blank forming, obtaining a pulp molded wet blank product Z0 with an original flank wall thickness Z01 through pulp molding; the pulp molded wet blank product Z0 is a pulp molded wet blank cup cover with equal wall thickness.

[0069] S2. Hot pressing and shaping, at least forcing the outer diameter of the original flank wall thickness Z01 in S1 to remain unchanged; and

[0070] The pulp molded wet blank product Z0 is sleeved on the shaping internal expansion mold 1, and the shaping internal expansion mold 1 applies a radially inward expansion force from the inside to the outside to the original flank wall thickness Z01. The radially inward expansion force causes the original flank wall thickness Z01 to be compressed and thinned to the set flank wall thickness Z10; and

[0071] When the radially inward expansion force forces the original flank wall thickness Z01 to be compressed and thinned, at least part of the inner wall of the original flank wall thickness Z01 is shaped into an inner convex Z11 in the direction opposite to the radially inward expansion force;

[0072] As shown in Figure 3 and Figures 6 - 10 , the specific steps of S2 are as follows:

[0073] S21. Place the pulp molding wet blank product Z0 between the shaping inner expanding mold 1 in the open mold state and the hot pressing shaping concave mold 2.

[0074] S22. Put the pulp molding wet blank product Z0 on the shaping inner expanding mold 1.

[0075] S23. The shaping inner expanding mold 1 and the hot pressing shaping concave mold 2 are closed and perform hot pressing shaping on the pulp molding wet blank product Z0. At this time, a dried pulp molding packaging product Z1 with at least a set side wall thickness Z10 is obtained, and an inner convex (Z11) is formed on the inner wall of the set side wall thickness Z10; and both the top Z02 and the transverse part Z03 are compressed and thinned to a state where the thickness is equal to the set side wall thickness Z10.

[0076] S24. The hot pressing shaping concave mold 2 is opened relative to the shaping inner expanding mold 1, and the shaping inner expanding mold 1 radially contracts under the elastic force of the transverse spring 12, so that the inner convex forming groove 1a of the shaping inner expanding mold 1 disengages from the inner convex (Z11), and at the same time, the elastic component 31 forces the shaping inner expanding mold 1 to reset upward.

[0077] Of course, the elastic component 31 can drive the shaping inner expanding mold 1 and the hot pressing shaping concave mold 2 that is closed to the shaping inner expanding mold 1 to reset upward together. After the hot pressing shaping concave mold 2 is reset in place, an external force is used to open the hot pressing shaping concave mold 2 relative to the shaping inner expanding mold 1.

[0078] S25. After the shaping inner expanding mold 1 disengages from the pulp molding packaging product Z1, take out the pulp molding packaging product Z1.

[0079] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 shown:

[0080] S3. Demoulding. The shaping inner expanding mold 1 in S2 radially contracts so that the shaping inner expanding mold 1 disengages from the inner convex Z11.

[0081] In S2 above, a hot pressing shaping concave mold 2 similar to the outer contour of the pulp molding wet blank product Z0 is provided, and the shaping inner expanding mold 1 is a hot pressing shaping inner expanding convex mold similar to the inner contour of the pulp molding wet blank product Z0. Either the hot pressing shaping concave mold 2 or the shaping inner expanding mold 1 moves relative to the other and forces the shaping inner expanding mold 1 to apply a radially inward expanding force from the inside to the outside on the original side wall thickness Z01.

[0082] In this embodiment, the hot pressing shaping concave mold 2 moves relative to the shaping inner expanding mold 1.

[0083] During the process of forming the inner convex Z11, the shaping and inner bulging die 1 and the hot pressing and shaping female die 2 respectively heat and dry the pulp molding wet blank product Z0. The heating and drying are carried out by means such as electric heating or steam heating and so on.

[0084] Embodiment III

[0085] As Figure 1 shown, this embodiment provides a pulp molding packaging product, which is obtained by the production process of the pulp molding packaging product in Embodiment II.

[0086] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A hot pressing shaping mold for pulp molded packaging products, wherein the pulp molded packaging product (Z1) has a set side wing wall thickness (Z10), and the hot pressing shaping mold comprises a hot pressing shaping die (2) for forcing at least the outer diameter of the original side wing wall thickness (Z01) of the pulp molded wet embryo product (Z0) to remain unchanged, characterized in that: The hot pressing shaping mold further comprises a shaping inner expansion mold (1) which cooperates with the hot pressing shaping concave mold (2) and forms a hot pressing shaping profiling cavity for accommodating the pulp molded wet embryo product (Z0), the shaping inner expansion mold (1) having an inner convex molding groove (1a), and the shaping inner expansion mold (1) applies a radial inner expansion force from inside to outside to the original side wing wall thickness (Z01), and the radial inner expansion force compresses and thins the original side wing wall thickness (Z01) to the set side wing wall thickness (Z10); and When the radial internal expansion force forces the original flank wall thickness (Z01) to be compressed and thinned, at least a portion of the inner wall of the original flank wall thickness (Z01) is shaped into an inner bulge (Z11) in the inner bulge forming groove (1a) in a direction opposite to the radial internal expansion force.

2. The hot pressing shaping mold for pulp molded packaging products according to claim 1, characterized in that: The inner convex molding groove (1a) is a circular ring groove.

3. The hot pressing shaping mold for pulp molded packaging products according to claim 1 or 2, characterized in that: An inclined internal expansion guide mechanism is provided between the shaping internal expansion mold (1) and the hot pressing shaping concave mold (2) to enable the shaping internal expansion mold (1) to expand radially outward.

4. The hot pressing shaping mold for pulp molded packaging products according to claim 3, characterized in that: The shaping inner expansion mold (1) moves up and down relative to the mold base (3) in the vertical direction, and the side of the shaping inner expansion mold (1) away from the hot pressing shaping die (2) is connected to the hot pressing shaping die (2) via an elastic component (31).

5. The hot pressing shaping mold for pulp molded packaging products according to claim 4, characterized in that: The shaping inner expansion mold (1) comprises a guide displacement outer mold (10) which at least partially slidably cooperates with the mold base (3), and a plurality of inner expansion molds (11) which are evenly distributed in a circumference and at least partially received in the guide displacement outer mold (10), a transverse spring (12) is provided between the outer side of the inner expansion mold (11) and the guide displacement outer mold (10), and also comprises a top mold (13) placed on the top of the inner expansion mold (11).

6. The hot pressing shaping mold for pulp molded packaging products according to claim 5, characterized in that: The inclined internal expansion guiding mechanism comprises a truncated cone (32) fixed to the mold base (3), and the inner wall of the internal expansion mold (11) has an inclined matching surface that matches the outer wall of the truncated cone (32).

7. The hot pressing shaping mold for pulp molded packaging products according to claim 5, characterized in that: At least part of the guide displacement outer die (10) is accommodated in the guide groove (30) of the die base (3), and the shaping inner expansion die (1) and the guide groove (30) are linearly slidably matched.

8. The hot pressing shaping mold for pulp molded packaging products according to claim 5, characterized in that: An accommodating groove (101) is provided on the upper part of the guiding displacement outer mold (10), and at least a part of the inner expansion mold (11) is located in the accommodating groove (101).

9. The hot pressing shaping mold for pulp molded packaging products according to claim 5, characterized in that: A plurality of demoulding air passages (130) with open upper ends are provided inside the top mold (13) and / or the inner expansion mold (11), and the demoulding air passages (130) are connected to an air source.

10. A production line for pulp molded packaging products, characterized in that: The production line comprises a hot pressing and shaping mold for the pulp molded packaging product according to any one of claims 1 to 9.

Images