Thread forming mold and thread forming process for pulp molding parts

Abstract

A thread forming mold and thread forming process for pulp molding parts. The thread forming mold comprises: a first mold, which defines a molding cavity capable of accommodating a wet blank of a pulp molding part; and a second mold, which is located on one side of the first mold and has a mold core, wherein the surface of the mold core is provided with a thread, the mold core rotates relative to the molding cavity in the molding cavity, so as to form a thread pattern on the wet blank of the pulp molding part, and the mold core can also be translated in the axial direction of the mold core, so as to extend into the molding cavity or be separated from the molding cavity.

Description

Thread forming die and thread forming process for paper plastic parts TECHNICAL FIELD

[0001] The present application relates to the technical field of paper plastic part manufacturing, in particular to a thread forming die and thread forming process for paper plastic parts. BACKGROUND

[0002] The pulp molding industry is rapidly developing, with increasing capacity and output. With the promotion of the "ban on plastic" and the improvement of environmental awareness, the market space for paper plastic parts is huge. Pulp molding products are gradually replacing traditional plastic products due to their environmental characteristics, such as recyclability and biodegradability.

[0003] Pulp molding products, or paper plastic parts, are mainly made from waste paper, wood pulp, plant fibers and other raw materials through a series of processes such as disintegration and grinding. The fibers in the pulp are deposited on a forming net mold and filtered and dewatered to form a wet embryo. Excess water is removed through pressing and drying, and finally shaped, inspected, packaged, etc.

[0004] Due to the limitations of materials and forming processes, it is difficult to manufacture paper plastic parts with threads. In related technologies, some solutions use a mold core mold composed of multiple sliding blocks. The multiple sliding blocks are connected to a wedge-shaped core, and the multiple sliding blocks are in sliding cooperation with the wedge-shaped core. By moving the wedge-shaped core, the multiple sliding blocks move outward to extrude the pulp wet embryo, thereby extruding the thread shape of the paper plastic part. By pulling out the wedge-shaped core, the multiple sliding blocks are retracted inward, thereby separating the mold from the wet embryo for easy disassembly.

[0005] However, this mold core structure is complex, has many parts, and has high assembly and processing costs. In addition, multiple parts need to move simultaneously during thread forming of the paper plastic part, and the joint lines at the joint of the multiple parts affect the appearance and reliability of the formed paper plastic part, leaving room for improvement.

[0006] SUMMARY

[0007] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a thread forming die for paper plastic parts, which is simple in structure and convenient for thread forming and mold core extraction.

[0008] The present application also provides a thread forming process for paper plastic parts.

[0009] According to the paper-plastic part thread forming die of the first aspect of the present application, the first die defines a plastic cavity capable of accommodating a paper-plastic part wet blank; the second die is located at one side of the first die, and has a die core with a threaded surface; the die core rotates relative to the plastic cavity to form a thread pattern on the paper-plastic part wet blank; and the die core can also translate along the axis of the die core to extend into or out of the plastic cavity.

[0010] According to the paper-plastic part thread forming die of the present application, the die core structure with threads is simple, has fewer parts, reduces assembly and processing costs, and has a simple and ingenious forming process, which can reduce the probability of wet blank waste, improve the qualification rate of wet blanks, meet the manufacturing requirements of threads of different sizes and depths, and have a wider application range. In addition, the structure of the paper-plastic part is not prone to splitting, and the appearance and reliability of the paper-plastic part can be improved.

[0011] According to the paper-plastic part thread forming die of the present application, the die core can be moved in a direction opposite to the direction of forming the thread pattern, so as to separate the paper-plastic part wet blank from the plastic cavity.

[0012] According to the paper-plastic part thread forming die of the present application, the drive assembly cooperates with the die core to drive the die core to rotate and translate synchronously.

[0013] According to the paper-plastic part thread forming die of the present application, the drive assembly includes a sliding member arranged on the second die and movable relative to the second die in a first direction, and the sliding member is rotationally connected with the die core; a guide member arranged on the first die and extending in a second direction, the second direction being inclined to the first direction, and the guide member is slidingly connected with the sliding member, wherein when the sliding member is driven, it can move relative to the guide member in the second direction and move relative to the second die in the first direction to drive the die core to rotate and move.

[0014] According to the paper-plastic part thread forming die of the present application, one of the sliding member and the guide member has a guide hole, and the other of the sliding member and the guide member is adapted to pass through the guide hole and slidingly connect the guide member with the sliding member.

[0015] According to the paper-plastic part thread forming die of the present application, the sliding member is provided with a driving tooth, and the die core is provided with a matching tooth, and the matching tooth is engaged with the driving tooth to rotationally connect the sliding member with the die core.

[0016] According to the paper-plastic part thread forming die, the sliding part comprises a seat body which is in sliding fit with the second die and the guide part respectively, and a rack which is arranged on the seat body and extends along the first direction, at least a part of the rack being located outside the seat body in the first direction and being provided with the driving teeth.

[0017] According to the paper-plastic part thread forming die, one of the second die and the seat body is provided with a guide rail, and the other of the second die and the seat body is in sliding fit with the guide rail.

[0018] According to the paper-plastic part thread forming die, the sliding part is in fit with the die core through a transmission structure, and the transmission structure comprises one of a gear set, a belt and a chain.

[0019] According to the paper-plastic part thread forming die, the second die comprises a die body, the die core being mounted on the die body, and a die cover which is arranged on a side of the die body away from the first die and is provided with a mounting cavity which is open on a side facing the die body, a part of the die core extending into the mounting cavity, and at least a part of the sliding part being arranged in the mounting cavity to be in rotational fit with the die core.

[0020] According to the paper-plastic part thread forming die, the die body is provided with a avoiding slot, and a part of the sliding part and / or a part of the guide part can extend into the avoiding slot to make the sliding part and the guide part in sliding fit.

[0021] According to the paper-plastic part thread forming die, the first die is further provided with a positioning block which is located on a side of the guide part and whose outer surface is formed with a first guide inclined surface, and an outer surface of the sliding part is formed with a second guide inclined surface, the first guide inclined surface and the second guide inclined surface extending in the same direction to make the sliding part and the positioning block in sliding fit.

[0022] According to the paper-plastic part thread forming die, the driving assembly comprises a first driving part and a second driving part, the first driving part being used to drive the die core to rotate, and the second driving part being used to drive the die core to translate.

[0023] According to the paper-plastic part thread forming die, the driving assembly comprises a fixing column, a driving part and a transmission part, the fixing column being arranged on the second die and being provided with a thread, the die core being in threaded fit with the fixing column, the driving part being arranged on the second die in sliding manner, and the driving part being in fit with the die core through the transmission part to drive the die core to rotate.

[0024] According to the paper plastic part thread forming die, the first driving member is a first driving motor, and an output shaft of the first driving motor is matched with the die core to drive the die core to rotate.

[0025] According to the paper plastic part thread forming die, the second driving member includes a lead screw, a sliding block and a second driving motor, the lead screw is matched with the sliding block in a thread mode, the first driving member is arranged on the sliding block, and the second driving motor is connected with the lead screw to drive the lead screw to rotate, so as to drive the sliding block, the first driving member and the die core to translate.

[0026] According to the paper plastic part thread forming die, the second die includes a die body, the die body is provided with a mounting groove, the top of the mounting groove is open, and the bottom wall of the mounting groove is provided with an opening, the die core is arranged on the mounting groove in a rotatable mode, and a part of the die core extends out of the mounting groove through the opening in the bottom wall and is provided with the thread.

[0027] According to the paper plastic part thread forming die, the side peripheral wall of the mounting cavity is provided with a mounting thread, and the die core is provided with a matched thread which is matched with the mounting thread.

[0028] According to the paper plastic part thread forming die, the pressing structure is a die cover.

[0029] According to the paper plastic part thread forming die, the pressing structure includes a die cover and a pressing plate, and the pressing plate is arranged between the die cover and the die body and is fixedly connected with one of the die cover and the die body.

[0030] According to the paper plastic part thread forming process, the paper plastic part thread forming die according to the first aspect of the application is used, and the process includes the following steps: placing a paper plastic part wet embryo in a plastic cavity of a first die; driving a die core to extend into the plastic cavity, driving the die core to rotate relative to the plastic cavity, and forming a thread on the wet embryo.

[0031] According to the paper plastic part thread forming process, the wet embryo is placed in the plastic cavity, the die core is driven to extend into the plastic cavity, and the thread is formed on the wet embryo, the forming process is simple and ingenious, the probability of wet embryo waste can be reduced, the qualified rate of the wet embryo can be improved, the manufacturing requirements of threads of different sizes and depths can be met, the application range is wider, in addition, the structure of the manufactured paper plastic part is not easy to produce line separation, and the appearance and reliability of the paper plastic part can be improved.

[0032] According to the thread forming process of the paper-plastic part, the mold core is driven to rotate reversely relative to the plastic cavity, so that the mold core is out of the plastic cavity.

[0033] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, wherein:

[0035] Fig. 1 is a schematic view of a thread forming mold according to some embodiments of the present application;

[0036] Fig. 2 is an exploded view of a thread forming mold according to some embodiments of the present application;

[0037] Fig. 3 is a partial schematic view of a thread forming mold according to some embodiments of the present application;

[0038] Fig. 4 is a schematic view of a thread forming process according to some embodiments of the present application;

[0039] Fig. 5 is a schematic view of a thread forming process according to yet some embodiments of the present application.

[0040] Reference signs: thread forming mold 100, first mold 10, plastic cavity 11, positioning block 12, first guide slope 121, first layer 101, first hole 1011, second hole 1012, second layer 102, second mold 20, mold body 21, mounting groove 211, avoiding groove 212, mold cover 22, mounting cavity 221, pressing plate 23, guide rail 24, mold core 30, thread 31, matching tooth 32, sliding member 40, guide hole 401, second guide slope 402, seat body 41, rack 42, driving tooth 421, guide member 50, wet embryo 60. DETAILED DESCRIPTION

[0041] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals are used throughout the figures to refer to the same or like elements or elements having the same or similar function. The embodiments described below are exemplary and are merely intended to explain the present application, and are not to be understood as limiting the present application.

[0042] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the features defined as "first", "second" can be explicitly or implicitly included one or more features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0043] In the description of the application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0044] The thread forming die 100 of the paper plastic part according to the embodiment of the application is described below with reference to Figures 1-3.

[0045] As shown in Figures 1-3, the thread forming die 100 according to one embodiment of the application comprises a first die 10 and a second die 20, the first die 10 defining a plastic cavity 11 capable of accommodating a paper plastic part wet blank 60; the second die 20 is located on one side of the first die 10, the second die 20 having a die core 30, the surface of the die core 30 being provided with threads 31, the die core 30 rotating relative to the plastic cavity 11 in the plastic cavity 11 to form thread patterns on the paper plastic part wet blank 60, the die core 30 can also translate along the axis of the die core 30 to extend into the plastic cavity 11 or to withdraw from the plastic cavity 11.

[0046] As shown in Figures 2 and 3, the first die 10 defines a plastic cavity 11, i.e. a space, for accommodating a paper plastic part wet blank 60, wherein the shape and size of the plastic cavity 11 match the design of the final paper plastic part, for example, the paper plastic part can be a paper pulp molded container lid, the plastic cavity 11 is a hollow chamber with one side open, and the wet blank 60 of the container lid is placed in the plastic cavity 11; the paper plastic part can also be a paper pulp molded container, the plastic cavity 11 is an annular cavity with a positioning paper bottle structure in the middle, and the mouth 60 of the paper pulp molded container wet blank is placed in the plastic cavity 11 and is sleeved on the outside of the positioning paper bottle structure.

[0047] The second mold 20 is located on one side of the first mold 10, and a mold core 30 is arranged on the second mold 20. The mold core 30 is an integral part, and the surface of the mold core 30 is designed to have a thread 31 shape. The mold core 30 can rotate relative to the plastic cavity 11 in the plastic cavity 11, and at the same time, the mold core 30 can also move in the axial direction to extend into the plastic cavity 11, that is, the mold core 30 rotates and advances towards the plastic cavity 11. This action can make the thread 31 on the surface of the mold core 30 form a thread pattern on the paper plastic part wet blank 60, such as forming a thread pattern on the inside or outside of the paper plastic product, for example, forming a thread pattern on the inside of the paper pulp molded container cover or forming a thread pattern on the outside of the mouth of the paper pulp molded container.

[0048] In addition, the mold core 30 can also move in the axial direction to move out of the plastic cavity 11, complete the movement of the mold core 30, and facilitate the subsequent demolding of the paper plastic part wet blank 60.

[0049] That is, by adopting the mold core 30 structure with the thread 31, the thread pattern is directly formed on the paper plastic part wet blank 60 during the movement of the mold core 30. The mold core 30 is an integral part, and the thread 31 is machined on it. The structure of the mold core 30 is simple, and the overall structure will not be divided. The appearance and reliability of the paper plastic part can be improved. The structure and movement mode of the mold core are simple and reliable, and can be used in various environmental conditions without affecting the reliability due to the environment.

[0050] Moreover, for the movement mode of the plurality of components in the prior art, the plurality of components are easily stuck in the wet blank 60 when they are retracted, which may cause the whole to be stuck and the wet blank 60 to be wasted. In the present application, the mold core 30 adopts a rotating mode to extrude the wet blank 60 to form a thread pattern on the wet blank 60, the forming process is simple, the mold core 30 is not easy to be stuck with the wet blank 60, the reliability is improved, the probability of waste of the wet blank 60 is reduced, and the qualified rate of the wet blank 60 is improved.

[0051] In addition, in the prior art, when the plurality of components cooperate to form a thread pattern in the bottle cap, if the bottle cap is too small, the internal space is limited, and the plurality of components have insufficient space to move, so it is difficult to form a deep thread pattern in the bottle cap. In the present application, by arranging different depths of threads 31 on the mold core 30 and rotating to extrude the wet blank 60, a thread pattern can be formed on the wet blank 60, thereby meeting the manufacturing requirements of different sizes and depths, and the application range is wider.

[0052] According to the paper-plastic part thread forming die 100 of the embodiment of the present application, by adopting the die core 30 structure with the thread 31, the die core 30 structure is simple, the parts are few, the assembly processing cost is reduced, the forming process is simple and ingenious, the probability of the wet blank 60 waste can be reduced, the qualified rate of the wet blank 60 can be improved, the thread manufacturing requirements of different sizes and different depths can be met, the application range is more extensive, in addition, the structure of the manufactured paper-plastic part is not easy to produce a line, the appearance and reliability of the paper-plastic part can be improved.

[0053] In some embodiments, the die core 30 can be moved in a manner opposite to the rotation direction of the thread to separate the paper-plastic part wet blank 60 from the plastic cavity 11, that is, when the die core 30 is pulled out of the plastic cavity 11, the paper-plastic part wet blank 60 is pulled out of the plastic cavity 11, the separation of the paper-plastic part wet blank 60 and the plastic cavity 11 is realized, it should be noted that in the process of forming the thread on the paper-plastic part wet blank 60, the die core 30 rotates and translates at the same time, when the die core 30 moves in the opposite manner, the die core 30 can rotate in the opposite direction, or the die core 30 can translate in the opposite direction, or the die core 30 can translate in the opposite direction and rotate in the opposite direction.

[0054] For example, the die core 30 rotates in the clockwise direction and extends into the plastic cavity 11, thereby forming a thread on the wet blank 60, by rotating the die core 30 in the counterclockwise direction and pulling it out of the plastic cavity 11, the wet blank 60 is rotated synchronously, thereby pulling the wet blank 60 out of the plastic cavity 11, after the wet blank 60 is completely separated from the cavity, the wet blank 60 and the die core 30 are relatively rotated to separate the wet blank 60 and the die core 30.

[0055] For another example, the die core 30 rotates and translates in the direction from top to bottom and extends into the plastic cavity 11, thereby forming a thread on the wet blank 60, by translating the die core 30 in the direction from bottom to top and pulling it out of the plastic cavity 11, the wet blank 60 is translated, thereby pulling the wet blank 60 out of the plastic cavity 11, after the wet blank 60 is completely separated from the cavity, the wet blank 60 and the die core 30 are relatively rotated to separate the wet blank 60 and the die core 30.

[0056] In other embodiments, when the die core 30 is pulled out of the plastic cavity 11, the wet blank 60 is always located in the plastic cavity 11, that is, when the die core 30 is pulled out of the plastic cavity 11, the die core 30 is separated from the wet blank 60, that is, the relative movement caused by the rotation between the threads is used to realize the demolding, after the die core 30 is completely separated from the wet blank 60, the wet blank 60 is taken out of the plastic cavity 11, the wet blank 60 is separated from the plastic cavity 11, and the wet blank 60 can be moved to the next process position.

[0057] In some embodiments, the thread forming die 100 further comprises a driving assembly cooperating with the die core 30 to drive the die core 30 to rotate and to move synchronously, the driving assembly can be one which drives the die core 30 to rotate and to move synchronously, the driving assembly can also be multiple, for example, one driving assembly drives the die core 30 to rotate, and another driving assembly drives the die core 30 to move.

[0058] As shown in FIGS. 1-3, in some embodiments, the driving assembly comprises a slider 40 and a guide 50, the slider 40 is arranged on the second die 20, the slider 40 is movable relative to the second die 20 along a first direction (up and down direction as shown in FIG. 1), the slider 40 is rotationally cooperated with the die core 30; the guide 50 is arranged on the first die 10, and the guide 50 extends along a second direction (from top to bottom and left obliquely), the second direction is oblique to the first direction, the guide 50 is slidingly cooperated with the slider 40.

[0059] Wherein, when the slider 40 is driven, the slider 40 is movable relative to the guide 50 along the second direction, and the slider 40 is movable relative to the second die 20 along the first direction to drive the die core 30 to rotate and to move, so that the die core 30 can rotate and move synchronously under the action of the slider 40.

[0060] Here, the slider 40 is driven, which can be directly applying a force to the slider 40 to make the slider 40 move relative to the guide 50, or indirectly applying a force to the slider 40, for example, applying a force to the second die 20 to move towards the first die 10, the slider 40 is arranged on the second die 20, and the guide 50 is arranged on the first die 10, so that the slider 40 moves relative to the guide 50, at this time, the slider 40 can move along the second direction, the slider 40 is slidingly cooperated with the second die 20, and thus the slider 40 can move along the first direction, the slider 40 is rotationally cooperated with the die core 30, and the die core 30 can rotate and move synchronously with the movement of the slider 40.

[0061] As shown in FIG. 1, in some embodiments, the slider 40 has a guide hole 401, the guide 50 is adapted to pass through the guide hole 401 to make the guide 50 slidingly cooperated with the slider 40, the guide 50 can form a columnar structure, the columnar guide 50 extends along the second direction, under the form of the guide 50 and the guide hole 401, the slider 40 and the guide 50 are not easy to disengage, which improves the reliability and stability of the cooperation. Of course, the guide hole 401 can also be arranged on the guide 50, and a part of the slider 40 can form a columnar structure, and a part of the slider 40 can extend into the guide hole 401 to make the slider 40 slidingly cooperated with the guide 50.

[0062] In some other embodiments, the sliding member 40 can also be arranged on one side of the guide member 50, and the two are in sliding fit through a sliding groove or parallel arrangement of mating surfaces, so as to realize the movement of the sliding member 40 relative to the guide member 50 in the second direction.

[0063] As shown in FIG. 3, in some examples, the sliding member 40 is provided with driving teeth 421, and the mold core 30 is provided with mating teeth 32, and the mating teeth 32 are engaged with the driving teeth 421, so that the sliding member 40 is in rotational fit with the mold core 30, that is, the sliding member 40 is engaged with the mold core 30, so that when the sliding member 40 moves, the driving teeth 421 thereon and the mating teeth 32 on the mold core 30 are engaged with each other, thereby ensuring that the translational movement of the sliding member 40 can be transmitted to the mold core 30, so that the mold core 30 can be correspondingly rotated in the axial direction and can be translated with the sliding member 40.

[0064] Through the above design, the mold can accurately form the required thread pattern on the paper plastic part, and the engagement design also helps to improve production efficiency and reduce errors in the operation process.

[0065] As shown in FIG. 2, in some embodiments, the sliding member 40 includes a seat body 41 and a rack 42, the seat body 41 is in sliding fit with the second mold 20, and the seat body 41 and the guide member 50 are in sliding fit; the rack 42 is arranged on the seat body 41, the rack 42 extends in the first direction, at least a part of the rack 42 is located outside the seat body 41 in the first direction, and the rack 42 is provided with driving teeth 421, since a part of the rack 42 is located on one side of the seat body 41, the mold core 30 can be arranged on this side of the seat body 41 in the first direction, so as to reduce the space occupied by the mold core 30 arranged in the second direction, and meanwhile the seat body 41 and the mold core 30 do not interfere with each other, thereby improving the compactness of the structure and reducing the space occupied by the whole mold.

[0066] As shown in FIG. 1, in some embodiments, the second mold 20 is provided with a guide rail 24, and the seat body 41 is in sliding fit with the guide rail 24, the guide rail 24 can guide and support the seat body 41 to move in the first direction, and it should be noted that in order to control the movement of the seat body 41 along the guide rail 24, driving devices such as hydraulic cylinders, air cylinders or mechanical connecting rods can be used to accurately control the position and movement speed of the seat body 41. Of course, the guide rail 24 can also be arranged on the seat body 41, and the second mold 20 is in sliding fit with the guide rail 24.

[0067] In the above scheme, the guide rail 24 can provide a guiding effect to ensure that the seat body 41 or the second mold 20 moves along a predetermined track, and can also provide a certain stability to prevent deviation or vibration during the operation of the mold, thereby being beneficial to improving the production efficiency and product quality.

[0068] In some embodiments, the sliding member 40 is matched with the mold core 30 through a transmission structure, which can be a gear set, a belt, or a chain. Under the action of the transmission structure, the mold core 30 is driven to rotate and can be translated when the sliding member 40 moves.

[0069] As shown in FIGS. 1 and 2, in some embodiments, the second mold 20 includes a mold body 21 and a mold cover 22, the mold core 30 is installed on the mold body 21, the mold cover 22 is arranged on the side of the mold body 21 away from the first mold 10, and the mold cover 22 has a mounting cavity 221 which is open on the side facing the mold body 21, a part of the mold core 30 extends into the mounting cavity 221, and at least a part of the sliding member 40 is arranged in the mounting cavity 221. As shown in FIGS. 1 and 2, the part of the mold core 30 having the matching teeth 32 can extend into the mounting cavity 221, and the part of the sliding member 40 having the driving teeth 421 is located in the mounting cavity 221, so that the driving teeth 421 can engage with the matching teeth 32, and the sliding member 40 can be rotationally matched with the mold core 30.

[0070] As shown in FIGS. 1 and 2, in some embodiments, the mold body 21 is located between the mold cover 22 and the first mold 10, the mold cover 22 has the sliding member 40, and the first mold 10 has the guide member 50. In order to make full use of the space of the mold body 21, a relief groove 212 can be arranged on the mold body 21, a part of the sliding member 40 can extend into the relief groove 212, and a part of the guide member 50 can also extend into the relief groove 212, so that the sliding member 40 and the guide member 50 are slidingly matched, thereby further improving the compactness of the structure and reducing the space occupied by the whole mold.

[0071] As shown in FIGS. 1-3, in some embodiments, the first mold 10 further has a positioning block 12 located on one side of the guide member 50, and the outer surface of the positioning block 12 is formed with a first guide slope 121, and the outer surface of the sliding member 40 is formed with a second guide slope 402, the first guide slope 121 and the second guide slope 402 have the same extension direction, so that the sliding member 40 is slidingly matched with the positioning block 12.

[0072] The outer surface of the positioning block 12 is formed with the first guide slope 121, the design of this slope helps to guide the sliding member 40 to move along a specific direction, so as to ensure that the contact between the sliding member 40 and the positioning block 12 is smooth and accurate; and the outer surface of the sliding member 40 is formed with the second guide slope 402. The design of this slope matches that of the first guide slope 121, so as to realize the sliding matching between the sliding member 40 and the positioning block 12. Under the cooperation of the two surfaces, the positioning block 12 can play a role of positioning and supporting the sliding member 40.

[0073] The first guide inclined surface 121 and the second guide inclined surface 402 can be parallel to the second direction, the guide member 50 extends along the second direction, and under the cooperation of the positioning block 12 and the guide member 50, the stability of the sliding member 40 during sliding can be further improved, the probability of shaking of the sliding member 40 is reduced, and the reliability of rotation of the mold core 30 is improved, so that accurate thread patterns can be formed on the wet embryo 60.

[0074] As shown in FIG. 1, in some examples, in order to facilitate the installation of the guide member 50 and the fixed installation of the positioning block 12, the first mold 100 can be designed as two layers, i.e., a first layer 101 and a second layer 102, the first layer 101 and the second layer 102 are fixedly connected, so that the guide member 50 can pass through the first hole 1011 of the first layer 101 and be fixedly limited by the second layer 101, the positioning block 12 can also be fixed on one side of the first layer 101 and fixedly connected with the first layer 101 through the fastener arranged on the other side, the second layer 102 can limit the fastener and make the fastener hidden inside the first mold 100, or the positioning block 12 is directly inserted and matched with the second hole 1012 on the first layer 101.

[0075] In some embodiments, the driving assembly includes a fixed column, a driving member and a transmission member, the fixed column is arranged on the second mold 20, and the fixed column has a thread, the mold core 30 can be threadedly matched with the fixed column, the driving member is slidingly arranged on the second mold 20, for example, arranged on the same track as the extension direction of the fixed column, the driving member is slidingly matched with the track, and the driving member is matched with the mold core 30 through the transmission member to drive the mold core 30 to rotate, when the driving member drives the mold core 30 to rotate, the mold core moves at the same time under the action of the thread due to the thread matching between the mold core 30 and the fixed column, at this time, the driving member can slide relative to the second mold 20, so that the plastic cavity 11 can be inserted, and the thread pattern can be formed on the paper-plastic wet embryo.

[0076] In other embodiments, the driving assembly includes a first driving member and a second driving member, the first driving member is used to drive the mold core 30 to rotate, the first driving member can be a hydraulic cylinder, a servo motor, an air cylinder or other types of rotary driving devices, which are used to make the mold core 30 rotate around the axis to form the thread pattern on the paper-plastic wet embryo 60. The second driving member is used to drive the mold core 30 to move in translation, the second driving member can also be a hydraulic cylinder, a servo motor, an air cylinder or other types of linear motion driving devices, which are used to control the movement of the mold core 30 along the axis direction, such as insertion or withdrawal from the plastic cavity 11. The first driving member and the second driving member work cooperatively to realize accurate positioning and movement of the mold core 30, and the two driving members are controlled respectively, which is conducive to improving the control accuracy and the flexibility of assembly production.

[0077] In some specific examples, the first driving member is a first driving motor, and an output shaft of the driving motor is matched with the mold core 30, so as to drive the mold core 30 to rotate.

[0078] In some specific examples, the second driving member includes a screw rod, a sliding block and a second driving motor, the screw rod is threadedly matched with the sliding block, the second driving motor is connected with the screw rod to drive the screw rod to rotate, so as to drive the sliding block to move, the first driving member is arranged on the sliding block, the sliding block moves to drive the first driving member to translate, the first driving member is matched with the mold core 30, so as to drive the mold core 30 to translate.

[0079] As shown in FIG. 2, in some specific examples, the second mold 20 includes a mold body 21 and a pressing structure, the mold body 21 has a mounting groove 211, a top of the mounting groove 211 is open, a bottom wall of the mounting groove 211 has an opening, the mold core 30 is rotatably arranged on the mounting groove 211, a part of the mold core 30 extends out of the mounting groove 211 through the opening of the bottom wall, and the part has a thread 31, at least a part of the pressing structure is arranged on the top of the mounting groove 211, and the pressing structure is matched with the mold body 21, so as to fix the mold core 30 on the mounting groove 211, and prevent the mold core 30 from separating from the mounting groove 211.

[0080] In some examples, the pressing structure can be a mold cover 22, the mold cover 22 is arranged on the top of the mounting groove 211, and the mold cover 22 is matched with the mold body 21 to fix the mold core 30 on the mounting groove 211.

[0081] As shown in FIG. 2, in some examples, the pressing structure includes the mold cover 22 and a pressing plate 23, the pressing plate 23 is arranged between the mold cover 22 and the mold body 21, the pressing plate 23 is fixedly connected with the mold cover 22, so as to fix the mold core 30 on the mounting groove 211, or the pressing plate 23 is fixedly connected with the mold body 21, and the mold body 21 can be connected with the mold body 21, so as to fix the mold core 30 on the mounting groove 211, and realize the fixation of the mold core 30.

[0082] In some embodiments, the side peripheral wall of the installation cavity 221 (i.e. the inner wall surface of the part of the mold body 21 forming the installation cavity 221) is provided with an installation thread, and the mold core 30 is provided with a matching thread that matches the installation thread, that is, when the mold core 30 is driven to rotate and translate, the mold core 30 rotates relative to the mold body 21, and the mold body 21 can support the rotation of the mold core 30 to some extent, reducing the probability of slippage and the like during rotation of the mold core 30, facilitating stable rotation of the mold core 30, and avoiding excessive friction between the mold core 30 and the paper-plastic part wet embryo 60, which can cause the wet embryo 60 to break, etc. In addition, when the mold core 30 is withdrawn from the plastic cavity 11, the mold core 30 can rotate relative to the mold body 21 through the matching of the matching thread and the installation thread, which is beneficial to the separation of the mold core 30 and the paper-plastic part wet embryo 60, and thus the mold core 30 is withdrawn from the plastic cavity 11, and the paper-plastic part wet embryo 60 can remain in the plastic cavity 11.

[0083] As shown in FIG. 4, the application also provides a thread forming process for a paper-plastic part, which uses the thread forming mold for a paper-plastic part described above. The thread forming process includes:

[0084] S1, placing a wet embryo of a paper-plastic part in a plastic cavity of a first mold;

[0085] S2, driving the mold core to extend into the plastic cavity and rotate relative to the plastic cavity to form threads on the wet embryo.

[0086] According to the thread forming process for a paper-plastic part, the wet embryo is placed in the plastic cavity, and the mold core is driven to extend into the plastic cavity to form threads on the wet embryo. The forming process is simple and ingenious, which can reduce the probability of wet embryo waste, improve the pass rate of the wet embryo, meet the manufacturing requirements of threads of different sizes and depths, and has a wider application range. In addition, the structure of the paper-plastic part is not prone to splitting, which can improve the appearance and reliability of the paper-plastic part.

[0087] As shown in FIG. 5, in some examples, the thread forming process includes:

[0088] S1, placing a wet embryo of a paper-plastic part in a plastic cavity of a first mold;

[0089] S2, driving the mold core to extend into the plastic cavity and rotate relative to the plastic cavity to form threads on the wet embryo.

[0090] S3, driving the mold core to rotate in the opposite direction relative to the plastic cavity to withdraw the mold core from the plastic cavity.

[0091] In some examples, when the mold core is withdrawn from the plastic cavity, the paper-plastic part wet embryo can be withdrawn from the plastic cavity synchronously, or the mold core can be withdrawn alone, and the paper-plastic part wet embryo can remain in the plastic cavity, and the mold core and the wet embryo can be separated.

[0092] According to the thread forming process of the paper-plastic part, the mold core can rotate into the plastic cavity and rotate out of the plastic cavity, so that the thread is formed on the wet embryo, the forming process is simple and ingenious, the probability of wet embryo waste can be reduced, the qualified rate of the wet embryo can be improved, the manufacturing requirements of threads with different sizes and depths can be met, the application range is wider, in addition, the structure of the manufactured paper-plastic part is not easy to produce line separation, and the appearance and reliability of the paper-plastic part can be improved.

[0093] A specific embodiment will be described below in combination with FIGS. 1-5.

[0094] The thread forming mold 100 includes a first mold 10, a second mold 20, a mold core 30, a sliding piece 40, and a guide piece 50, and the second mold 20 is arranged above the first mold 10.

[0095] The first mold 10 defines a plastic cavity 11 with an open top, the guide piece 50 is arranged on the first mold 10, the guide piece 50 is located on one side of the plastic cavity 11, the guide piece 50 extends along a second direction (inclined from top to bottom to left), and the first mold 10 further has a positioning block 12 located on one side of the plastic cavity 11, and one side surface of the positioning block 12 forms a first guide inclined surface 121 extending along the second direction (inclined from top to bottom to left).

[0096] The second mold 20 includes a mold body 21, a mold cover 22, a pressing plate 23, and a guide rail 24, the mold body 21 defines a mounting groove 211 and a avoiding groove 212, the mold cover 22 has a mounting cavity 221 with an open lower side, the top of the mounting groove 211 is open, the bottom wall of the mounting groove 211 has an opening, the guide rail 24 is arranged at the mounting cavity 221, a part of the sliding piece 40 is arranged at the mounting cavity 221, the sliding piece 40 is in sliding fit with the guide rail 24, the guide rail 24 extends along a first direction, and the sliding piece 40 has a rack 42 extending along the first direction.

[0097] The mold core 30 is rotatably arranged on the mounting groove 211, an upper part of the mold core 30 extends into the mounting cavity 221, and this part has a matching tooth 32 engaged with a driving tooth 421 on the rack 42; a lower part of the mold core 30 extends out of the mounting groove 211 through the opening of the bottom wall, and this part has a thread 31, the pressing plate 23 is arranged at the top of the mounting groove 211, and the pressing plate 23 is matched with the mold body 21 to fix the mold core 30 on the mounting groove 211.

[0098] The sliding piece 40 has a guide hole 401 and a second guide inclined surface 402, the second guide inclined surface 402 has the same inclination angle as the first guide inclined surface 121, and the guide hole 401 has the same extension direction as the guide piece 50.

[0099] When it is required to manufacture threads on the paper plastic part, the wet embryo 60 of the paper plastic part is placed in the plastic cavity 11, and then the first mold 10 and the second mold 20 are driven to perform mold closing, that is, the first mold 10 and the second mold 20 are close to each other, for example, the second mold 20 moves downward, so that the guide 50 penetrates the guide hole 401 of the sliding piece 40, so that the sliding piece 40 is in sliding fit with the guide 50, the second guide inclined surface 402 of the sliding piece 40 is in abutment with the first guide inclined surface 121 of the positioning block 12, so that the sliding piece 40 can move in the second direction, since the sliding piece 40 is arranged on the guide rail 24, when the sliding piece 40 moves in the second direction, movement in the first direction occurs, the rack 42 moves to drive the mold core 30 to rotate, so that the mold core 30 realizes the rotating action; at the same time, since the second mold 20 moves downward, the mold core 30 mounted on the mold body 21 moves downward synchronously, so that the mold core 30 realizes rotation and translation, thereby the thread pattern can be formed on the wet embryo 60.

[0100] When the first mold 10 and the second mold 20 are away from each other, the sliding piece 40 performs the reverse action as described above, so as to drive the mold core 30 to move reversely, that is, the mold core 30 can be pulled out of the plastic cavity 11.

[0101] Other configurations and operations of the paper plastic part mold according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here. Among them, the up-down direction, the left-right direction and the front-rear direction are based on the up-down direction, the left-right direction and the front-rear direction shown in the figure.

[0102] In the description of the present application, unless otherwise explicitly specified and limited, the first feature is "above" or "below" the second feature, which can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "above", "over" and "on" the second feature, which includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height.

[0103] In the description of the present application, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present description, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0104] While the embodiments of the application have been shown and described, it is to be understood that the embodiments can be varied, modified, substituted and changed by those skilled in the art without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A thread forming die for a paper plastic part, characterized by, The application relates to a mould for forming a paper plastic product, comprising: a first mould defining a plastic cavity for accommodating a paper plastic product wet embryo; a second mould located at one side of the first mould, the second mould having a mould core, the surface of the mould core being provided with threads, the mould core being rotatable relative to the plastic cavity in the plastic cavity to form thread patterns on the paper plastic product wet embryo, the mould core being further translatable along the axis of the mould core to extend into or out of the plastic cavity.

2. The thread forming die for paper plastic articles according to claim 1, characterized in that, The mould core can be moved in a direction opposite to the rotation direction of forming the thread patterns to separate the paper plastic product wet embryo from the plastic cavity.

3. A thread forming die for paper over plastic parts according to claim 1 or 2, characterized in that The application further relates to a mould driving assembly, comprising: a driving assembly cooperating with the mould core to drive the mould core to rotate and translate synchronously.

4. The thread forming die for paper laminates according to claim 3, characterized in that, The driving assembly comprises: a sliding member provided on the second mould and movable relative to the second mould in a first direction, the sliding member being rotatable with the mould core; a guide member provided on the first mould and extending in a second direction, the second direction being inclined to the first direction, the guide member being slidably connected with the sliding member, wherein the sliding member is movable relative to the guide member in the second direction and movable relative to the second mould in the first direction to drive the mould core to rotate and translate.

5. The thread forming die for paper over plastic parts according to claim 4, wherein One of the sliding member and the guide member has a guide hole, and the other of the sliding member and the guide member is adapted to pass through the guide hole to slidably connect the guide member with the sliding member.

6. The thread forming die for paper over plastic parts according to claim 4, wherein The sliding member is provided with driving teeth, and the mould core is provided with cooperating teeth, the cooperating teeth being engaged with the driving teeth to rotatably connect the sliding member with the mould core.

7. The thread forming die for paper over plastic parts according to claim 6, wherein The sliding member comprises: a seat body slidably connected with the second mould and the guide member respectively; a rack provided on the seat body and extending in the first direction, at least a part of the rack being located outside the seat body in the first direction and provided with the driving teeth.

8. The thread forming die for paper over plastic parts according to claim 7, wherein One of the second mould and the seat body has a guide rail, and the other of the second mould and the seat body is slidably connected with the guide rail.

9. The thread forming die for paper laminates as claimed in claim 4 wherein, The sliding member is rotatably connected with the mould core through a transmission structure, the transmission structure comprising one of a gear set, a belt and a chain.

10. The thread forming die for paper over plastic parts according to claim 4, wherein, The second mould comprises: a mould body, the mould core being mounted on the mould body; a mould cover provided on the side of the mould body away from the first mould and having a mounting cavity, the side of the mounting cavity facing the mould body being open, a part of the mould core extending into the mounting cavity, and at least a part of the sliding member being provided in the mounting cavity to rotatably connect with the mould core.

11. The thread forming die for paper over plastic parts according to claim 10, wherein, The mould body has a avoiding slot, a part of the sliding member and / or a part of the guide member being able to extend into the avoiding slot to slidably connect the sliding member with the guide member.

12. The thread forming die for paper over plastic parts according to claim 4, wherein, The first mould is further provided with a positioning block, the positioning block being located at one side of the guide member and the outer surface of the positioning block being formed with a first guide inclined surface, the outer surface of the sliding member being formed with a second guide inclined surface, the first guide inclined surface and the second guide inclined surface extending in the same direction to slidably connect the sliding member with the positioning block.

13. The thread forming die for paper over plastic parts according to claim 3, wherein, The driving assembly comprises a fixed column, a driving member and a transmission member, the fixed column is arranged on the second mold and has a thread, the mold core is threadedly matched with the fixed column, the driving member is slidingly arranged on the second mold, and the driving member is matched with the mold core through the transmission member to drive the mold core to rotate.

14. The thread forming die for paper over plastic parts according to claim 3, wherein, The driving assembly comprises a first driving member and a second driving member, the first driving member is used to drive the mold core to rotate, and the second driving member is used to drive the mold core to translate.

15. The thread forming die for paper over plastic parts according to claim 14, wherein, The first driving member is a first driving motor, an output shaft of the first driving motor is matched with the mold core to drive the mold core to rotate.

16. The thread forming die for paper over plastic parts of claim 14 wherein, The second driving member comprises a screw rod, a sliding block and a second driving motor, the screw rod is threadedly matched with the sliding block, the first driving member is arranged on the sliding block, and the second driving motor is connected with the screw rod to drive the screw rod to rotate, thereby driving the sliding block, the first driving member and the mold core to translate.

17. A thread forming die for paperboard containers according to any one of claims 1-16, characterized in that, The second mold comprises: A mold body, the mold body has a mounting groove, a top of the mounting groove is open, a bottom wall of the mounting groove has an opening, a mold core is rotatably arranged on the mounting groove, a part of the mold core extends out of the mounting groove through the opening of the bottom wall and has a thread, a pressing structure is arranged on the top of the mounting groove and matched with the mold body, and the pressing structure is used to fix the mold core on the mounting groove. A side peripheral wall of the mounting cavity is provided with a mounting thread, the mold core has a matched thread, and the matched thread is matched with the mounting thread. The pressing structure is a mold cover.

18. The thread forming die for paper over plastic parts according to claim 17, wherein, The pressing structure comprises a mold cover and a pressing plate, the pressing plate is arranged between the mold cover and the mold body and is fixedly connected with one of the mold cover and the mold body.

19. The thread forming die for paper over plastic parts of claim 17 wherein, Comprise:

20. The thread forming die for paper over plastic parts of claim 17 wherein, Placing a wet embryo of a paper plastic part into a plastic cavity of a first mold; 21. A thread forming process for a paper-plastic part using a thread forming die for a paper-plastic part according to any one of claims 1 to 20, characterized in that, Driving the mold core to extend into the plastic cavity and drive the mold core to rotate relative to the plastic cavity to form a thread on the wet embryo. Further comprise: Driving the mold core to reversely rotate relative to the plastic cavity to make the mold core out of the plastic cavity.

22. A thread forming process for paper over plastic parts as claimed in claim 21 wherein, ​ ​

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