A cold pressing forming device for disposable paper containers

Abstract

This application relates to the processing of paper containers, and particularly to a cold pressing and forming device for disposable paper containers, which includes an upper die, a lower die, a pulp bucket, and a lifting mechanism; a punch is provided at the bottom of the upper die, and a mold cavity is correspondingly arranged on the lower die; several pores are provided on the side wall of the mold cavity, and the pores penetrate through the lower die to allow the pulp in the mold cavity to flow back into the pulp bucket; the pulp bucket is arranged below the lower die; the lifting mechanism is connected to the lower die and is used to drive the lower die to lift and enter and exit the pulp bucket. The mold cavity combines a filter screen and a support plate to form an efficient dehydration structure, and the liquid guide groove and the slurry leakage hole cooperate to optimize the pulp flow path. At the same time, an external air source is introduced through the first air guide hole and the second air guide hole to enhance the dehydration effect. This application achieves the technical effects of improving the pulp forming efficiency, reducing material waste, and enhancing the container forming quality.

Description

Technical Field

[0001] This application relates to the technical field of paper container processing, and in particular to a cold pressing forming device for disposable paper containers. Background Art

[0002] Paper containers such as paper cups and paper dinner plates are widely used in the catering industry due to their environmental friendliness and have become an important alternative to traditional plastic products. With the popularization of environmental protection concepts and the progress of technology, the market demand for disposable paper containers continues to grow. To meet this demand, paper container forming equipment has emerged, providing high-quality paper container products for the market through efficient production processes, which has greatly promoted the development of the environmental protection packaging industry.

[0003] For the processing of paper containers, paper pulp is usually used and completed through forming equipment. Specifically, the forming equipment has a cold pressing forming die, which includes an upper die and a lower die, and the lower die is provided with a mold cavity. The paper pulp is injected into the mold cavity, and the upper die and the lower die are closed, and the upper die cold presses the paper pulp in the mold cavity to form a paper container.

[0004] However, since the amount of paper pulp is not easy to accurately control, the amount of paper pulp injected into the mold cavity is more or less. When the paper pulp is less, the paper container will be incomplete; when the paper pulp is more, it will overflow from the mold cavity and a large amount of scrap will be formed, resulting in material waste. Summary of the Invention

[0005] This application provides a cold pressing forming device for disposable paper containers, and adopts the following technical solutions:

[0006] A cold pressing forming device for disposable paper containers includes an upper die, a lower die, a paper pulp bucket and a lifting mechanism; a convex die is provided at the bottom of the upper die, and a mold cavity is correspondingly provided on the lower die; a plurality of pores are provided on the side wall of the mold cavity, and the pores penetrate through the lower die for the paper pulp in the mold cavity to flow back into the paper pulp bucket;

[0007] The paper pulp bucket is arranged below the lower die; the lifting mechanism is connected to the lower die and is used to drive the lower die to lift and enter and exit the paper pulp bucket.

[0008] By adopting the above technical solutions, by providing pores on the side wall of the mold cavity and making the pores penetrate through the lower die, the excess paper pulp can flow back into the paper pulp bucket, avoiding the overflow and generation of scrap caused by too much paper pulp, and at the same time solving the problem of incomplete paper containers when the paper pulp is insufficient. The setting of the lifting mechanism enables the lower die to flexibly enter and exit the paper pulp bucket, improving the automation degree and operation convenience of the equipment.

[0009] Preferably, the mold cavity includes a filter screen and a support plate. The support plate is recessed into a trough shape, and the filter screen is disposed inside the support plate and connected to the support plate; slurry leakage holes are formed in the support plate, and the slurry leakage holes penetrate through the support plate.

[0010] By adopting the above technical solution, the combined design of the filter screen and the support plate can effectively filter and support the pulp in the mold cavity, ensuring the uniform distribution of the pulp during the forming process. At the same time, the setting of the slurry leakage holes enables the excess pulp to flow out of the support plate smoothly, avoiding the overflow of the pulp from the mold cavity, reducing material waste, and thus improving the forming quality of the paper container.

[0011] Preferably, liquid guide grooves are formed on the inner side wall of the support plate. The liquid guide grooves are communicated with the slurry leakage holes, and the filter screen abuts against the inner wall of the support plate.

[0012] By adopting the above technical solution, the setting of the liquid guide grooves can effectively guide the flow of the excess pulp in the mold cavity and return it to the pulp bucket through the slurry leakage holes, avoiding the waste caused by the residue of the pulp in the mold cavity or affecting the forming quality.

[0013] Preferably, the upper mold is provided with a first air guide hole for connecting an external air source; an air valve is arranged at the first air guide hole, and the air outlet end of the first air guide hole is arranged towards the inside of the liquid guide groove.

[0014] By adopting the above technical solution, the upper mold is provided with the first air guide hole and connected to the external air source, which can introduce gas into the liquid guide groove, thereby effectively cleaning the excess pulp in the mold cavity and reducing material waste. At the same time, the introduction of the air flow helps to accelerate the evaporation of water in the pulp and improve the drying rate.

[0015] Preferably, multiple liquid guide grooves are provided, and a plurality of slurry leakage holes are correspondingly arranged; one end of the liquid guide groove is an air inlet end, and the other end is an air outlet end, and the air inlet end and the air outlet end are respectively located on both sides in the width direction of the mold cavity, and the slurry leakage holes are arranged at the air outlet end of the liquid guide groove.

[0016] By adopting the above technical solution, the setting of multiple liquid guide grooves can effectively guide the air flow distribution, enabling the gas to form a uniform flow path in the mold cavity, thereby more comprehensively cleaning the excess pulp; the slurry leakage holes recover the excess pulp and reduce material waste. The design that the air inlet end and the air outlet end are respectively located on both sides in the width direction of the mold cavity enables the air flow to fully circulate in the mold cavity, improving the cleaning efficiency and accelerating the drying rate. The slurry leakage holes are located at the air outlet end of the liquid guide groove, further ensuring that the excess pulp is effectively discharged and improving the forming quality of the paper container.

[0017] Preferably, the multiple liquid guide grooves are arranged in parallel, and the distribution directions of two adjacent liquid guide grooves are opposite.

[0018] By adopting the above technical solution, multiple liquid guide grooves are arranged in parallel and the distribution directions of two adjacent liquid guide grooves are opposite, which can enable the air flow to form a staggered flow effect inside the mold cavity, thereby flushing the side wall of the filter screen more evenly, further improving the efficiency of cleaning excess pulp, and enhancing the drying uniformity.

[0019] Preferably, the bottom wall of the liquid guide groove is arranged in a wavy shape.

[0020] By adopting the above technical solution, the design of the wavy bottom wall can increase the flow path of the air flow in the liquid guide groove, making the air flow form a turbulent flow effect when passing through the liquid guide groove, thereby more effectively removing the residual pulp on the side wall of the filter screen and further improving the drying efficiency in the process of forming the paper container.

[0021] Preferably, the periphery of the filter screen has a frame, the lower mold is provided with a groove matching with the frame, and the frame is detachably connected to the lower mold; a second air guide hole is opened on the frame, and the second air guide hole is communicated with the first air guide hole and the liquid guide groove.

[0022] By adopting the above technical solution, the filter screen is provided with a frame on its periphery and is detachably connected to the lower mold, making the installation and disassembly of the filter screen more convenient, facilitating cleaning and maintenance. The second air guide hole is opened on the frame and is communicated with the first air guide hole and the liquid guide groove, further optimizing the air flow path, ensuring that the air flow can effectively enter the liquid guide groove, thereby improving the flushing effect on the side wall of the filter screen, reducing the residual of excess pulp, and enhancing the drying efficiency.

[0023] Preferably, a step surface is opened on one side of the frame close to the filter screen, and the top of the frame abuts against the upper mold; the step surface is the side wall of the cavity.

[0024] By adopting the above technical solution, a stable support structure is formed when the frame abuts against the upper mold, effectively preventing deviation or deformation during the forming process, thereby improving the forming accuracy and quality of the paper container.

[0025] In summary, the present invention includes at least one of the following beneficial technical effects:

[0026] 1. By arranging pores on the side wall of the mold cavity and cooperating with the pulp bucket, the automatic reflux of pulp can be realized, effectively solving the problem of pulp volume fluctuation, and avoiding the incompleteness of the container caused by too little pulp or the waste of materials caused by too much pulp;

[0027] 2. The combined design of the filter screen and the support plate, combined with the reflux function of the pulp leakage hole, optimizes the distribution and forming process of the pulp, and improves the forming efficiency and the quality of the paper container;

[0028] 3. The combined use of the liquid guide groove and the air flow can not only clean the excess pulp, but also significantly improve the drying rate, thereby shortening the production cycle and improving the operation efficiency of the equipment. Brief Description of the Drawings

[0029] Figure 1 is a schematic diagram of the overall structure of the disposable paper container forming device in the embodiment of the present application;

[0030] Figure 2 is a schematic diagram of the structures of the upper die and the lower die in the embodiment of the present application;

[0031] Figure 3 is a cross-sectional view of the mold cavity in the embodiment of the present application.

[0032] Figure 4 is a schematic diagram of the structures of the slurry leakage holes and the liquid guide grooves in the embodiment of the present application.

[0033] Reference numerals in the drawings: 1, upper die; 11, punch; 12, first air guide hole; 2, lower die; 21, support plate; 211, slurry leakage hole; 212, liquid guide groove; 22, filter screen; 23, frame; 231, second air guide hole; 232, step surface; 3, pulp bucket; 4, lifting mechanism; 5, frame. Detailed Description of the Embodiment

[0034] The following further elaborates on the present invention with reference to the attached Figures 1-4 drawings.

[0035] Referring to Figure 1 and Figure 2 , the disposable paper container forming device provided in the embodiment of the present application includes a frame 5, an upper die 1 fixedly arranged on the frame 5, a pulp bucket 3 arranged at the bottom of the frame 5, a lower die 2 arranged between the pulp bucket 3 and the upper die 1, and a lifting mechanism 4 fixed on the frame 5.

[0036] Referring to Figure 2 and Figure 3 , wherein, a punch 11 is arranged at the bottom of the upper die 1, a mold cavity is correspondingly arranged on the lower die 2, and a plurality of pores are arranged on the side wall of the mold cavity, and the pores penetrate through the lower die 2 to enable the pulp in the mold cavity to flow back into the pulp bucket 3; the pulp bucket 3 is arranged below the lower die 2; the lifting mechanism 4 is connected to the lower die 2 and is used to drive the lower die 2 to lift and enter and exit the pulp bucket 3. The lifting mechanism 4 adopts a hydraulic cylinder.

[0037] When cold pressing the paper container, the lifting mechanism 4 first drives the lower die 2 into the pulp bucket 3. The pulp bucket 3 is filled with uniform pulp, and the pulp enters the mold cavity. Subsequently, the lifting mechanism 4 drives the lower die 2 to rise above the pulp bucket 3 and cooperate with the upper die 1 to close the die. The excess pulp in the mold cavity can flow back into the pulp bucket 3 through the pores of the lower die 2, and by controlling the size of the pores, it is ensured that enough pulp can be retained in the mold cavity, and through the cold pressing of the upper die 1 and the lower die 2, it is formed into a paper container. The effects of effectively controlling the pulp amount, reducing material waste, and improving product quality are achieved.

[0038] Specifically, the mold groove includes a filter screen 22 and a support plate 21. The filter screen 22 can be made of stainless steel or high-density polyethylene. In the embodiment of the present application, the filter screen 22 is woven from stainless steel wires, and the stainless steel wires are closely arranged to ensure that the pores between the stainless steel wires are small enough to allow some pulp to remain inside the mold groove. The support plate 21 can be a metal plate. The support plate 21 is concave to form a groove body, and the filter screen 22 is arranged inside the support plate 21 and is connected to the inside of the support plate 21. The support plate 21 is provided with pulp leakage holes 211, and the pulp leakage holes 211 penetrate through the support plate 21, facilitating the smooth discharge of excess pulp.

[0039] Furthermore, the peripheral side of the filter screen 22 has a frame 23, and the lower mold 2 is provided with a groove for cooperating with the frame 23, and the frame 23 and the lower mold 2 can be detachably connected to the lower mold 2 by means of bolt fixation or snap connection, so as to facilitate the replacement of the filter screen 22.

[0040] A stepped surface 232 is provided on one side of the frame 23 close to the filter screen 22. The top of the frame 23 abuts against the upper mold 1 to form a stable support structure, ensuring close contact when the upper mold 1 and the lower mold 2 are closed, and avoiding pulp leakage. The stepped surface 232 is the side wall of the cavity. During cold pressing, the edge of the paper container, such as the rim of a cup or the edge of a bowl, can be formed at the stepped surface 232.

[0041] Furthermore, a liquid guide groove 212 is provided on the inner side wall of the support plate 21. The liquid guide groove 212 is communicated with the pulp leakage holes 211, and the filter screen 22 abuts against the inner wall of the support plate 21. The cross-sectional shape of the liquid guide groove 212 can be rectangular or trapezoidal, with a width range of 3 mm to 8 mm and a depth range of 2 mm to 5 mm. The liquid guide groove 212 can be arranged longitudinally along the inner side wall of the support plate 21 or distributed horizontally in multiple rows to form a multi-directional pulp discharge channel, ensuring that the pulp can be discharged evenly.

[0042] Specifically, the upper mold 1 is provided with a first air guide hole 12, and the first air guide hole 12 is used to connect to an external air source, such as an air compressor. A gas valve is provided at the first air guide hole 12, and the gas valve can be a manual regulating valve or a solenoid valve, facilitating the control of the opening and closing of the air flow. For example, the gas valve is made of stainless steel, has good corrosion resistance, and is flexible and reliable in switching.

[0043] Correspondingly, a second air guide hole 231 is provided on the frame 23. The second air guide hole 231 is communicated with the first air guide hole 12 and the liquid guide groove 212. The second air guide hole 231 is located in the middle of the frame 23. The air flow enters the liquid guide groove 212 through the first air guide hole 12 and the second air guide hole 231. The air flow flows rapidly in the liquid guide groove 212, which can effectively clean the bottom wall of the filter screen 22 and the excess pulp in the liquid guide groove 212, and at the same time accelerate the drying of the pulp, contributing to improving production efficiency.

[0044] In addition, a valve can be additionally provided at the pulp leakage hole 211. When the valve is opened, the pulp is discharged normally. After the paper container is cold-pressed and formed, the valve is closed, and air can be introduced into the liquid guide groove 212 to increase the air pressure between the support plate 21 and the filter screen 22. The air pressure acts on the paper container through the pores of the filter screen 22, and rapid demolding of the paper container can be achieved. Moreover, since the air pressure is relatively uniform, the force on the paper container will also be relatively uniform, and the paper container is not easily damaged during demolding, thus ensuring the production quality.

[0045] Referring to Figure 4 , further, multiple liquid guide grooves 212 are provided, and multiple corresponding pulp leakage holes 211 are provided. One end of the liquid guide groove 212 is an air inlet end, and the other end is an air outlet end. The air inlet end and the air outlet end are respectively located on both sides in the width direction of the mold groove, and the pulp leakage hole 211 is provided at the air outlet end of the liquid guide groove 212. An interleaved pulp discharge path is formed between the multiple liquid guide grooves 212, further improving the pulp discharge efficiency.

[0046] The multiple liquid guide grooves 212 are arranged in parallel, and the distribution directions of two adjacent liquid guide grooves 212 are opposite. For example, one liquid guide groove 212 is arranged from left to right, and the other liquid guide groove 212 is arranged from right to left. In the embodiment of the present application, two adjacent liquid guide grooves 212 are not communicated with each other and work independently. At this time, multiple first air guide holes 12 need to be correspondingly provided on the upper mold 1 so that air can enter each liquid guide groove 212.

[0047] As a preferred implementation manner, two adjacent liquid guide grooves 212 can also adopt a structure form of being connected end to end in sequence to form a "Z" - shaped arrangement. At this time, only one first air guide hole 12 needs to be provided.

[0048] Further, the bottom wall of the liquid guide groove 212 is arranged in a wavy shape. The wavy bottom wall can adopt a continuous sine wave shape, so that the air flow entering the inside of the liquid guide groove 212 can continuously scour the side wall of the filter screen 22, avoiding pulp residue and significantly improving the drying rate. For example, under the action of the wavy bottom wall, the air flow forms multiple rebounds and dispersions, enhancing the peeling effect on the pulp.

[0049] The implementation principle of this embodiment is as follows: By providing pores on the side wall of the mold groove and combining the driving of the lower mold 2 in and out of the pulp bucket 3 by the lifting mechanism 4, precise control of the pulp amount is achieved. At the same time, by providing the liquid guide groove 212 and the air guide hole, the excess pulp is cleaned and the drying is accelerated by using the air flow, significantly improving the forming quality and production efficiency of the paper container. In addition, the combined design of the filter screen 22 and the support plate 21 and the application of the wavy liquid guide groove 212 further optimize the equipment performance.

[0050] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A cold pressing forming device for disposable paper containers, characterized in that, It includes an upper mold (1), a lower mold (2), a pulp bucket (3) and a lifting mechanism (4); a punch (11) is provided at the bottom of the upper mold (1), and a mold cavity is correspondingly arranged on the lower mold (2); a plurality of pores are provided on the side wall of the mold cavity, and the pores penetrate through the lower mold (2) for the pulp in the mold cavity to flow back into the pulp bucket (3). The pulp bucket (3) is arranged below the lower mold (2); the lifting mechanism (4) is connected to the lower mold (2) and is used to drive the lower mold (2) to lift and enter and exit the pulp bucket (3). The mold cavity includes a filter screen (22) and a support plate (21), the support plate (21) is concave into a groove body, and the filter screen (22) is arranged inside the support plate (21) and connected to the support plate (21); slurry leakage holes (211) are formed in the support plate (21), and the slurry leakage holes (211) penetrate through the support plate (21). Liquid guide grooves (212) are formed on the inner side wall of the support plate (21), the liquid guide grooves (212) are communicated with the slurry leakage holes (211), and the filter screen (22) abuts against the inner wall of the support plate (21). The upper mold (1) is provided with a first air guide hole (12), and the first air guide hole (12) is used to connect to an external air source; the air outlet end of the first air guide hole (12) is arranged towards the inside of the liquid guide groove (212).

2. The cold pressing and forming equipment for disposable paper containers according to claim 1, characterized in that, An air valve is arranged at the first air guide hole (12).

3. The cold pressing and forming equipment for disposable paper containers according to claim 1, wherein, A plurality of the liquid guide grooves (212) are provided, and a plurality of the slurry leakage holes (211) are correspondingly arranged; one end of the liquid guide groove (212) is an air inlet end, and the other end is an air outlet end, and the air inlet end and the air outlet end are respectively located on both sides in the width direction of the mold cavity, and the slurry leakage holes (211) are arranged at the air outlet end of the liquid guide groove (212).

4. The cold pressing and forming equipment for disposable paper containers according to claim 3, characterized in that, The plurality of liquid guide grooves (212) are arranged in parallel, and the distribution directions of two adjacent liquid guide grooves (212) are opposite.

5. The cold pressing and forming equipment for disposable paper containers according to claim 1, characterized in that The bottom wall of the liquid guide groove (212) is arranged in a wavy shape.

6. The cold pressing and forming equipment for disposable paper containers according to claim 1, wherein, A frame (23) is provided on the periphery of the filter screen (22), and the lower mold (2) is provided with a groove for cooperating with the frame (23), and the frame (23) is detachably connected to the lower mold (2); a second air guide hole (231) is formed in the frame (23), and the second air guide hole (231) is communicated with the first air guide hole (12) and the liquid guide groove (212).

7. The cold pressing and forming equipment for disposable paper containers according to claim 6, characterized in that, A step surface (232) is formed on one side of the frame (23) close to the filter screen (22), and the top of the frame (23) abuts against the upper mold (1); the step surface (232) is the side wall of the mold cavity.

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