Concave punching die for paper pulp molded product

Abstract

The utility model provides a denting mold for a paper pulp molded product, and belongs to the technical field of paper pulp molding processing. Comprising at least one concave part; the male die is arranged opposite to the female die, the male die is provided with at least one convex part, and the convex part is matched with the concave part; and the clamping plate is connected to the face, away from the male die, of the female die, and the face, facing the male die, of the clamping plate is provided with a denting pattern which is within the orthographic projection range of the concave part. A first through hole is formed in the clamping plate, a gasket is plugged on the first through hole, the gasket is detachably connected with the clamping plate, and a concave pattern is arranged on the face, facing the male die, of the gasket. The function of clamping a paper-plastic product and the function of the denting punch are integrated, an independent denting punch is not needed, the denting effect can be achieved through cooperation of the convex part of the convex die, the concave die and the clamping plate, the denting effect of multiple cavities can be achieved at the same time through one-time denting operation, and the denting efficiency is improved. The device has the effects of simplifying the denting process and improving the denting efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of pulp molding processing, and in particular to a double-sided concave mold for pulp molded products. Background Art

[0002] Molded pulp products are made from plant fibers, using a press machine and jigs to shape pulp into shapes. They are environmentally friendly packaging materials and are widely used for packaging fragile, easily breakable items, such as food, cosmetics, electronics, spare parts, or glassware, that need to be protected from crushing.

[0003] Currently, with the continuous improvement of the quality and appearance requirements of pulp molded products, manufacturers usually add recycling logos, trademarks, trade names or other decorative or iconic patterns into pulp molded products. These patterns are achieved through denting. In order to achieve a clear and realistic pattern effect, a commonly used process is to use a pressing device to extrude the designated part of the product after the pulp is molded. For example, the Chinese patent with publication number CN 112157962 A discloses an integrated mold and method for denting and trimming pulp molded products. The denting process of the denting mold involved is to penetrate the denting punch into the pulp molded product cavity and press the denting pad to form the pattern at the end of the denting punch three-dimensionally on the surface of the pulp molded product cavity.

[0004] However, if multiple cavities of a pulp molded product need to be debossed to create a three-dimensional pattern, the existing debossing mold requires removing the pulp molded product from the mold after debossing one cavity, replacing the cavity with another, and then fixing it to the mold to deboss again. This process of debossing multiple cavities sequentially is very cumbersome. Therefore, the applicant believes that it is necessary to design a debossing mold that can deboss multiple locations simultaneously to simplify the current debossing process for multi-cavity pulp molded products. Utility Model Content

[0005] In order to improve the defects of existing denting molds such as repeated operations, complicated procedures and low denting efficiency when denting multiple parts, the purpose of this application is to provide a pulp molded product denting mold, which can simultaneously complete the denting of multiple parts of the pulp molded product in one denting operation, thereby simplifying the denting process and improving the denting efficiency.

[0006] In order to achieve the purpose of this application, this application provides a pulp molded product concave mold, which adopts the following technical solution:

[0007] A denting mold for pulp molded products comprises: a die having at least one concave portion; a punch arranged opposite to the die, the punch having at least one convex portion, the convex portion matching the die; a clamping plate connected to a side of the die away from the punch, the side of the clamping plate facing the punch being provided with a denting pattern.

[0008] The technical solution of the present application replaces the conventional denting punch design with the convex part of the punch. The die and the punch match the shape of the pulp molded product cavity to clamp the pulp molded paper product to be dented, and at the same time have the function of squeezing and denting the pulp molded product.

[0009] In order to make the pulp molded product to be dented more stably clamped between the die and the punch, the technical solution of the present application no longer designs a denting pattern at the end of the punch. That is to say, unlike the conventional design where the denting pattern is not set at the end of the denting punch, the denting pattern is set on the clamping plate, and the outer surface of the convex part is smooth. In this way, the contact area between the convex part of the punch and the pulp molded product will be increased.

[0010] Another important point is that the present application can achieve denting of different patterns by replacing the clamping plate with non-passing patterns. The manufacture of the clamping plate with denting patterns is simpler than the manufacture of the punch with denting patterns, which helps to save the production cost of the denting mold.

[0011] Furthermore, a first through hole is opened on the clamping plate, and a gasket is sealed on the first through hole. The gasket is detachably connected to the clamping plate, and the dented pattern is set on the side of the gasket facing the punch, and the dented pattern is within the positive projection range of the concave portion.

[0012] Furthermore, the first through hole is located within the orthographic projection range of the recess.

[0013] In this further technical solution, the debossed pattern is provided on the gasket. Changing the debossed pattern only requires replacing the gasket, making it easier to change the debossed pattern. Furthermore, a clamping plate can be provided with multiple first through-holes, each of which can be blocked with a gasket having a different debossed pattern as required, thereby enabling the production of more diverse debossed products.

[0014] At the same time, the provision of the first through hole and the detachably connected gasket facilitates easier demolding in the event of equipment failure. Because when a pulp molded product is dented and the equipment fails and needs to be manually demolded for maintenance, the mold is currently pried open from between the upper mold and the lower mold. However, since a large amount of air is squeezed out between the molds during the pulp molding denting process, it becomes very difficult to pry the mold open from between the upper and lower molds during maintenance. At this time, by opening the gasket to allow air to enter the mold from the first hole, it is easy to demold and repair, and it is not easy to cause cracking, deformation, burrs and other problems in the paper and plastic products in the mold.

[0015] Furthermore, a mounting groove is provided on a side of the die away from the punch, the depth of the mounting groove is equal to the thickness of the clamping plate, and the clamping plate is placed in the mounting groove and connected to the die.

[0016] Furthermore, the outer surface of the gasket in the installed state is in the same plane as the outer surface of the clamping plate.

[0017] The above-mentioned further technical solution ensures that the surface of the die facing away from the punch is flat, which facilitates the subsequent installation and fixation of the die on the pressing equipment. At the same time, the outer surface of the clamping plate for mounting the gasket is flat to ensure that the shape of the gasket will not appear in the debossing effect during debossing.

[0018] Furthermore, the outer edges of the punch and the clamping plate are larger than the outer edge of the die, and a positioning structure is provided between the outer edges of the punch and the clamping plate. During the die pressing process, the positioning structure prevents the die from being misaligned and improves the accuracy of the denting.

[0019] Furthermore, the male mold has a second through-hole, which is sealed with a cover that is removably connected to the male mold shell. In this further technical solution, the second through-hole serves a similar function to the first through-hole in the event of a mechanical failure. By opening the cover on the second through-hole, air is allowed to enter the mold from the male mold side, facilitating quick and labor-saving demoulding.

[0020] Furthermore, the outer surface of the cap in the installed state is in the same plane as the outer surface of the male mold. This further technical solution facilitates the subsequent installation of the male mold on the pressing device and avoids the outer shape of the cap being printed on the mold.

[0021] Furthermore, it also includes a die mounting plate and a punch mounting plate, the die mounting plate is fixed to the side of the die away from the punch, the punch mounting plate is fixed to the side of the punch away from the die, and a limiting block is set between the die mounting plate and the punch mounting plate.

[0022] In the above further technical solution, the die mounting plate and the punch mounting plate are used to respectively mount the die and the punch on the pressing device, and the limit block prevents the pressing device from being over-extruded during the concave pressing.

[0023] Furthermore, the die has at least four recesses, the punch has at least four protrusions that cooperate with the recesses, and at least two gaskets are provided on the clamping plate, and the two gaskets are diagonally distributed.

[0024] The technical solution of the present application designs the concave mold and the convex mold according to the shape of the pulp molded product to be dented, determines which cavity parts of the product need to be dented, and designs gaskets in the concave parts corresponding to each part to be dented, so that the effect of denting multiple parts of the pulp molded product can be achieved simultaneously with one denting operation.

[0025] In summary, the present application provides a pulp molded product concave mold, which has the following technical effects:

[0026] First, the debossing die of this application integrates the function of clamping the paper plastic product with the function of the debossing punch. This eliminates the need for a separate debossing punch; the debossing effect can be achieved through the cooperation of the convex portion of the punch, the concave die, and the clamping plate. Furthermore, the concave and convex dies can be designed according to the shape of the paper plastic product to be debossed, and gaskets can be designed on the clamping plate corresponding to each portion to be debossed. This allows paper plastic products with multiple cavities to be debossed simultaneously in a single operation, simplifying the debossing process and improving debossing efficiency.

[0027] Second, the present application uses the design of a detachable gasket to make the replacement of the debossed pattern cheaper and easier to operate, and can also produce more diverse debossed products.

[0028] Third, through the design of the first through hole and the second through hole, when the pressing equipment stops due to mechanical failure, air can enter between the die and the paper-plastic product through the first through hole, and air can enter between the punch and the paper-plastic product through the second through hole, which facilitates quick and labor-saving demolding and maintenance. At the same time, it is not easy to cause deformation, burrs and other problems in the paper-plastic product, which helps to reduce the defective rate of paper-plastic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front view structural schematic diagram of the concave punching mold of the present application.

[0030] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of the AA surface in the middle.

[0031] Figure 3 It is a structural schematic diagram of the concave mold in the concave mold of this application.

[0032] Figure 4 is an exploded structural schematic diagram of the clamping plate of the draw die of the present application, wherein the dotted line is the assembly line.

[0033] Figure 5 is a structural schematic diagram of the punch of the draw die of the present application.

[0034] Figure 6 is an exploded structural schematic diagram of the draw die of the present application, and shows the positional relationship between each component and the pulp molded product, wherein the dotted line is the assembly line.

[0035] 1, draw die mounting plate; 10, limiting block;

[0036] 2, draw die; 21, recess; 22, mounting groove;

[0037] 3, punch; 31, protrusion; 32, second through hole;

[0038] 4, clamping plate; 41, first through hole;

[0039] 5, punch mounting plate;

[0040] 6, pulp molded product; 61, cavity; 62, draw effect;

[0041] 7, gasket; 71, draw pattern;

[0042] 8, cover;

[0043] 9, positioning structure; 91, positioning hole; 92, positioning column. DETAILED DESCRIPTION

[0044] In order to make the purpose and technical scheme of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. In addition, the terms "first" and "second" are used for description purposes only, and cannot be understood as indicating or implying relative importance. The directions mentioned in the following embodiments, such as up, down, left, right, front, back, bottom, top, etc., are only the directions with reference to the drawings. Therefore, the directions used are used for illustration, not to limit the present application.

[0045] Reference Signs List Figure 1The present application discloses a pulp molded product denting mold, hereinafter referred to as the denting mold, comprising a die mounting plate 1, a die 2, a punch 3, a clamping plate 4, and a punch mounting plate 5. The shapes of the die 2 and the punch 3 match and match the outer shape of the pulp molded product 6 to be dented. The punch 3 and the die 2 are used to clamp the pulp molded product 6 to be dented after forming. The side where the die 2 and the punch 3 are close to each other is defined as the inner side, and the side where the die 2 and the punch 3 are away from each other is defined as the outer side. The clamping plate 4 is connected to the outer side of the die 2 by bolts, that is, the die 2 is located between the clamping plate 4 and the punch 3. The die mounting plate 1 is connected to the clamping plate 4 on the outer side of the clamping plate 4 by bolts, and the die 2 is also connected and fixed to the die mounting plate 1 by bolts. The punch mounting plate 5 is connected to the punch 3 on the outer side of the punch 3 by bolts.

[0046] Reference Figure 2 and Figure 3 The die 2 has four recesses 21 arranged in a cross shape, and each recess 21 completely penetrates the thickness of the die 2. The outer surface of the die 2 is partially recessed inward to form a mounting groove 22. The thickness of the mounting groove 22 is equal to the thickness of the clamping plate 4. The mounting groove 22 is used to place the clamping plate 4. The outer edge of the die 2 and the outer edge of the clamping plate 4 are provided with mutually aligned screw holes. The die 2 and the clamping plate 4 can be assembled together by bolts and screw holes. After assembly, the outer side surface of the clamping plate 4 is in the same plane as the outer side surface of the die 2.

[0047] Reference Figure 4 A first through hole 41 is formed on the clamping plate 4 at a position corresponding to the recess 21 of the die 2. The orthographic projection of the first through hole 41 is within the range of the orthographic projection of the recess 21 of the die 2. The first through hole 41 is blocked by a gasket 7, which is snap-fitted to block the first through hole 41, so that the gasket 7 and the clamping plate 4 form a detachable connection. The thickness of the gasket 7 is equal to the thickness of the clamping plate 4, so that the inner and outer sides of the gasket 7 are respectively in the same plane as the inner and outer sides of the clamping plate 4 when installed, so as to prevent the outer shape of the gasket 7 from being printed on the pulp molded product 6 during denting. The inner side of the gasket 7 is prefabricated with a denting pattern 71. By snapping and installing gaskets 7 with different denting patterns 71 through the first through hole 41, denting effects 62 of different patterns can be achieved. During the denting, the cavity 61 of the pulp molded product 6 to be dented is placed in the concave portion 21 of the die 2 , and the lower surface of the cavity 61 abuts against the inner side surface of the clamping plate 4 and the denting pattern 71 on the inner side surface of the gasket 7 .

[0048] Reference Figure 5The punch 3 is provided with four protrusions 31 aligned with the recesses 21. When denting, the protrusions 31 are used to extend into the cavity 61 of the pulp molded product 6, and the outer side of the protrusion 31 abuts the inner surface of the cavity 61 of the pulp molded product 6. At least one second through hole 32 is provided on the punch 3 at the periphery of the protrusion 31. In the present application, the punch 3 is preferably provided with two second through holes 32 at the periphery of the protrusion 31. The two second through holes 32 can be distributed diagonally. A cover 8 can be detachably fastened to each second through hole 32. The thickness of the cover 8 is equal to that of the punch 3, so that the inner and outer sides of the cover 8 in the installed state are respectively in the same plane as the inner and outer sides of the punch 3, so as to prevent the outer shape of the cover 8 from being printed on the pulp molded product 6 during denting. The second through hole 32 and the cover 8 are designed to open the cover 8 when the pressing equipment fails to stop, so that air can enter between the molds from the side of the punch 3. In this way, it is easier to open the mold when repairing the fault.

[0049] Reference Figure 6 The die 2 shown in the present application has four recesses 21, and the punch 3 has four corresponding protrusions 31, but this is not the only limitation. The shapes and numbers of the recesses 21 and protrusions 31 can vary depending on the shape of the pulp molded product 6 to be concave and the cavity 61. The figure of the present application shows two first through holes 41 arranged diagonally, but this is not the only one. The number and position of the first through holes 41 can be adaptively changed according to the number and position of the cavities 61 to be concave. For example, in other embodiments, the present application can set the first through hole 41 and the gasket 7 at the bottom of one recess 21, or can set the first through hole 41 and the gasket 7 at the bottom of any two or three recesses 21, or can set the first through hole 41 and the gasket 7 at the bottom of all four recesses 21.

[0050] Reference Figure 2 and Figure 6 In this application, the width direction of the clamping plate 4 and the punch 3 is greater than the width direction of the die 2, so that a certain installation space is formed between the outer edge of the width direction of the clamping plate 4 and the outer edge of the width direction of the punch 3. A positioning structure 9 is provided in this installation space. Specifically, the positioning structure 9 includes a positioning hole 91 and a positioning column 92. The clamping plate 4 has a positioning hole 91 at each of the four corners. A positioning column 92 is fixed to each position on the inner side of the punch 3 corresponding to the positioning hole 91. When denting, the positioning column 92 is inserted into the positioning hole 91 to play a positioning role for the denting mold.

[0051] Reference Figure 2 and Figure 6The die mounting plate 1 and the punch mounting plate 5 respectively connect the die 2 to the punch 3 and the pressing device. The outer edges of the die mounting plate 1 and the punch mounting plate 5 are larger than the clamping plate 4 and the punch 3, so that a certain installation space is formed between the die mounting plate 1 and the punch mounting plate 5. A limit block 10 is provided between the installation space of the die mounting plate 1 and the punch mounting plate 5. The limit block 10 can be fixed to the die mounting plate 1 or the punch mounting plate 5. In this application, the limit block 10 is fixed to the inner side surface of the punch mounting plate 5 in a direction perpendicular to the punch mounting plate 5. The minimum height of the limit block 10 is equal to the sum of the thicknesses of the punch 3 and the die 2. When denting, the limit block 10 can limit the minimum distance between the die 2 and the punch 3 to avoid over-extrusion of the dented pulp molded product 6.

[0052] Reference Figure 6 When installing the denting mold of the present application, there is no special restriction on the relative positions of the die 2 and the punch 3. The die 2, the clamping plate 4 and the die mounting plate 1 can be installed at the installation position of the die on the pressing device, and the punch 3 and the punch mounting plate 5 can be installed at the installation position of the lower die of the pressing device. Alternatively, the punch 3 and the punch mounting plate 5 can be installed at the installation position of the die on the pressing device, and the die 2, the clamping plate 4 and the die mounting plate 1 can be installed at the installation position of the lower die of the pressing device. As a preferred embodiment, the die 2, the clamping plate 4 and the die mounting plate 1 can be installed at the installation position of the die on the pressing device, and the punch 3 and the punch mounting plate 5 can be installed at the installation position of the lower die of the pressing device. In this way, after the denting is completed, the upper arm of the pressing device rises, and the pulp molded product 6 is demoulded, and the denting effect 62 can be directly observed.

[0053] When the denting mold of the present application is used, the mold is assembled according to the above-mentioned assembly method and installed and fixed on the pressing equipment. First, a defective product is placed on the denting mold, and the pressure, descent, and ascending distance are adjusted through the machine page of the pressing equipment. After the denting test is carried out step by step to determine the desired denting depth effect, the good product is started to be dented in multiple positions at a time. After the denting is completed, the product is sucked away by the robotic arm and the next product is dented in multiple positions at a time. The paper-plastic product with multiple cavities 61 can achieve the effect of denting multiple cavities 61 at the same time in one denting operation, which has the effect of simplifying the denting process and improving the denting efficiency.

[0054] Although the present application has been disclosed above with reference to the embodiments, they are not intended to limit the present application. Anyone with ordinary knowledge in the technical field may make slight changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be determined by the scope of the appended patent application.

Claims

1. A pulp molded product concave mold, characterized in that: include: a concave die having at least one concave portion; a male mold, arranged opposite to the female mold, the male mold having at least one convex portion, the convex portion matching the concave portion; A clamping plate connected to the side of the die away from the punch, the side of the clamping plate facing the punch being provided with a concave pattern; The female mold has at least four recessed parts, and the male mold has at least four raised parts matched with the recessed parts.

2. A pulp molded product concave mold according to claim 1, characterized in that: The clamping plate is provided with a first through hole, the first through hole is blocked with a gasket, the gasket is detachably connected to the clamping plate, the gasket is provided with the dented pattern on a side facing the punch, and the dented pattern is within the positive projection range of the concave portion.

3. A pulp molded product concave mold according to claim 2, characterized in that: The first through hole is located within the orthographic projection range of the recess.

4. A pulp molded product concave mold according to claim 3, characterized in that: A mounting groove is provided on one side of the die away from the punch, the depth of the mounting groove is equal to the thickness of the clamping plate, and the clamping plate is placed in the mounting groove and connected to the die.

5. A pulp molded product denting mold according to claim 4, characterized in that: The outer surface of the gasket in the installed state is in the same plane as the outer surface of the clamping plate.

6. A pulp molded product concave mold according to claim 5, characterized in that: The outer edges of the punch and the clamping plate are larger than the outer edge of the die, and a positioning structure is provided between the outer edge of the punch and the outer edge of the clamping plate.

7. The pulp molded product concave mold according to claim 1, characterized in that: The male mold is provided with a second through hole, the second through hole is blocked with a cover, and the cover is detachably connected to the male mold shell.

8. The pulp molded product concave mold according to claim 7, characterized in that: The outer surface of the cover in the installed state is in the same plane as the outer surface of the male mold.

9. The pulp molded product concave mold according to claim 1, characterized in that: It also includes a die mounting plate and a punch mounting plate. The die mounting plate is fixed to the side of the die away from the punch, and the punch mounting plate is fixed to the side of the punch away from the die. A limiting block is set between the die mounting plate and the punch mounting plate.

10. The pulp molded product concave mold according to claim 3, characterized in that: At least two gaskets are provided on the clamping plate, and the two gaskets are distributed diagonally.

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