Hot pressing die and hot pressing system

Abstract

The utility model relates to the technical field of paper-plastic forming, and discloses a hot-pressing die and a hot-pressing system, and the hot-pressing die comprises a first hot-pressing piece, a second hot-pressing piece and a third hot-pressing piece, the second hot-pressing piece is arranged in the first concave cavity, the second hot-pressing piece is provided with a second concave cavity, the inner side of the second concave cavity is provided with a third concave cavity, and the second concave cavity, the third concave cavity and the inner side wall of the first hot-pressing piece jointly define a containing space; and the heating channel is arranged in the containing space, the heating channel and the inner side wall of the containing space are arranged in a matched mode, and heat conduction oil is placed in the heating channel in a flowing mode and used for heating the forming face of the second hot-pressing piece. According to the utility model, the heating channel is arranged in the second concave cavity and the third concave cavity of the second hot-pressing piece, so that the distance between the heating channel and the forming surface is closer, the heat loss in the heating process is less, the power required for heating the heat-conducting oil can be reduced, and the energy consumption is further reduced; and the heating channel is matched with the inner side wall of the accommodating space, so that the temperature transferred to the forming surface is more uniform, and the product quality can be improved.

Description

Technical Field

[0001] This utility model relates to the field of paper-plastic molding technology, specifically to hot pressing molds and hot pressing systems. Background Technology

[0002] Paper-plastic molding is a technology that uses paper pulp as raw material and processes it into three-dimensional shapes through specific processes. It is widely used in environmentally friendly packaging, industrial cushioning materials, disposable tableware, and other fields. Paper pulp thermoforming involves solidifying paper pulp through a hot press mold. Under high temperature and pressure, the hot press mold rapidly evaporates the water in the paper pulp, tightly binding the fibers and forming a dense and strong product. The process flow of paper pulp thermoforming is as follows: a suction mold draws paper pulp from a pulp tank and initially extrudes it to form an intermediate product. This intermediate product is then subjected to a second extrusion process using a hot press mold to form the final product, which is then transported to the next process via a transfer mold.

[0003] like Figure 1 As shown, in the existing pulp hot pressing molding device, a first hot pressing mold 02 and a second hot pressing mold 03 are fixed on two machine base plates 01 arranged opposite each other. Multiple heating rods 04 are fixed on the machine base plates 01. The first hot pressing mold 02 and the second hot pressing mold 03 absorb the heat from the heating rods 04 and transfer it to the intermediate product. The machine base plates 01 are provided with a first air supply channel 011, the first hot pressing mold 02 is provided with a second air supply channel 021, and the second hot pressing mold 03 is provided with a third air supply channel 031. The first air supply channel 011 is connected to the second air supply channel 021 and the third air supply channel 031 respectively, and is used to send the water vapor in the intermediate product out of the machine base plates 01.

[0004] Because the distance between the heating rod 04 and the first hot press mold 02 and the second hot press mold 03 is relatively large, a lot of heat is lost. In order to ensure that the temperature of the intermediate product surface is controlled at about 130°C, the heating power of the heating rod 04 needs to be increased, resulting in high energy consumption. Utility Model Content

[0005] In view of this, the present invention provides a hot pressing mold and a hot pressing system to solve the problem of high energy consumption of the hot pressing mold in the existing pulp hot pressing molding device.

[0006] In a first aspect, this utility model provides a hot pressing mold, comprising:

[0007] The first hot-pressed component is provided with a first concave cavity;

[0008] The second hot-pressing component is disposed in the first concave cavity. The second hot-pressing component has a second concave cavity, and a third concave cavity is disposed on the inner side of the second concave cavity. The cross-sectional dimension of the third concave cavity is smaller than that of the second concave cavity. The second concave cavity and the third concave cavity together with the inner wall of the first hot-pressing component form an accommodating space.

[0009] A heating channel is provided within the accommodating space. The heating channel is configured to cooperate with the inner sidewall of the accommodating space. Heat-conducting oil flows and is placed within the heating channel to heat the forming surface of the second hot-pressed part that is away from the second concave cavity.

[0010] Beneficial effects: By placing the heating channels in the second and third recesses of the second hot press, the distance between the heating channels and the forming surface is closer, resulting in less heat loss during heating. This reduces the power required to heat the heat transfer oil, thereby reducing energy consumption and saving costs. By fitting the heating channels in conjunction with the inner wall of the accommodating space, the temperature transferred to the forming surface is more uniform, improving product quality. Furthermore, by placing heat transfer oil flowing within the heating channels to heat the forming surface, energy consumption is further reduced, and the heating stability is good, allowing for continuous long-term constant-temperature heating.

[0011] In one alternative implementation, the heating channel and / or the second hot press is a 3D printed structure.

[0012] Beneficial effects: By using 3D printing technology to process the heating channel, it is easy to customize the shape of the heating channel according to the shape of the accommodating space; by using 3D printing technology to process the second hot press, it is easy to open the air holes and to customize the shape of the second hot press according to the type of product to be extruded.

[0013] In one alternative embodiment, the 3D printing material for the heating channel is stainless steel powder.

[0014] Beneficial effects: By using stainless steel powder as the material for the heating channel, the good thermal stability of stainless steel powder can prevent the inner wall of the heating channel from rusting during use, thus avoiding affecting the heating effect.

[0015] In one optional embodiment, the second hot press is provided with a plurality of air holes for conveying water vapor from the forming surface of the second hot press to the first cavity.

[0016] Beneficial effects: By providing multiple air holes on the second hot press, water vapor can be discharged from multiple directions, thereby reducing the temperature difference on the forming surface and keeping the temperature difference within ±1℃, which can ensure the product quality of the extruded product.

[0017] In one optional embodiment, the first hot-pressing member is provided with a first through hole connecting the first cavity to the outside, for discharging the water vapor in the first cavity.

[0018] Beneficial effect: Water vapor is discharged through the first through hole, which can prevent water vapor from adsorbing on the outer wall of the heating channel and causing corrosion.

[0019] In one optional embodiment, the two ends of the heating channel extend out of the first hot pressing member and communicate with the heating member, which is used to heat the heat transfer oil.

[0020] In one optional embodiment, the hot pressing mold includes:

[0021] A temperature measuring element is disposed near the molding surface of the second hot press and is used to measure the temperature of the molding surface.

[0022] Beneficial effects: By setting up temperature measuring devices, the real-time temperature of the forming surface can be detected, so that extrusion molding is only carried out when the temperature of the forming surface is 130℃, thereby improving product quality.

[0023] Secondly, this utility model also provides a hot pressing system, comprising:

[0024] The aforementioned hot press mold is provided in two parts, with the forming surfaces of the two second hot press parts arranged opposite to each other for extruding the parts to be hot pressed.

[0025] Beneficial effects: Since the hot pressing system includes a hot pressing mold, it has the same effect as the hot pressing mold, which will not be elaborated here.

[0026] In one alternative embodiment, the hot pressing system includes:

[0027] A heating element, connected to both ends of the heating channel;

[0028] And / or, there are two fasteners, and the first hot-pressing member is fixedly connected to the fastener.

[0029] In one optional embodiment, the heating element is electrically connected to the temperature measuring element of the hot pressing mold to control the heating power of the heating element.

[0030] Beneficial effects: By electrically connecting the heating element and the temperature measuring element, the heating power of the heating element can be controlled according to the real-time temperature of the forming surface, thereby ensuring that the temperature of the forming surface is maintained at 130℃. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of a prior art pulp hot pressing molding device;

[0033] Figure 2 This is a schematic diagram of the structure of a hot pressing mold according to an embodiment of the present utility model;

[0034] Figure 3 for Figure 2 The exploded view of the hot press mold is shown.

[0035] Explanation of reference numerals in the attached figures:

[0036] 01. Machine base plate; 011. First air supply channel; 02. First hot press mold; 021. Second air supply channel; 03. Second hot press mold; 031. Third air supply channel; 04. Heating rod;

[0037] 1. First hot-pressed component; 11. First cavity; 12. First through hole; 13. Second through hole; 14. Fourth through hole; 15. Fifth through hole; 2. Second hot-pressed component; 21. Third through hole; 3. Heating channel. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] The following is combined with Figures 2 to 3 The following describes embodiments of the present invention.

[0040] According to an embodiment of the present invention, a hot pressing mold is provided, comprising: a first hot pressing component 1 having a first cavity 11; a second hot pressing component 2 disposed within the first cavity 11, the second hot pressing component 2 having a second cavity, a third cavity being disposed inside the second cavity, the cross-sectional dimension of the third cavity being smaller than that of the second cavity, the second cavity and the third cavity together with the inner wall of the first hot pressing component 1 forming an accommodating space; and a heating channel 3 disposed within the accommodating space, the heating channel 3 being configured to cooperate with the inner wall of the accommodating space, and heat-conducting oil flowing and placed within the heating channel 3 for heating the forming surface of the second hot pressing component 2 away from the second cavity.

[0041] By placing the heating channel 3 within the second and third recesses of the second hot press 2, the distance between the heating channel 3 and the forming surface is reduced, resulting in less heat loss during heating. This reduces the power required to heat the heat transfer oil, thereby lowering energy consumption and saving costs. Furthermore, by aligning the heating channel 3 with the inner wall of the accommodating space, the temperature transferred to the forming surface becomes more uniform, improving product quality. By placing heat transfer oil within the heating channel 3 to heat the forming surface, energy consumption is further reduced, and the heating process exhibits good stability, allowing for sustained, long-term constant-temperature heating.

[0042] In existing pulp hot pressing molding equipment, each heating rod has a heating power of 10.8KW, and a set of heating rods consumes 2073.6 kWh per day. In contrast, the heat transfer oil in this embodiment has a heating power of 18KW, consuming 432 kWh per day. Therefore, the hot pressing mold in this embodiment can save 1641.6 kWh of electricity per day, which is about 26% of the electricity consumption of existing pulp hot pressing molding equipment.

[0043] like Figure 3 As shown, the first cavity 11 of the first hot press component 1 is provided with a fourth through hole 14, which is fixedly connected to the second hot press component 2 by bolts. As an alternative embodiment, the second hot press component 2 can also be snapped or glued into the first hot press component 1, and no further restrictions are imposed here.

[0044] In existing pulp hot pressing molding devices, the second air supply channel 021 and the third air supply channel 031 carry away some heat, resulting in uneven heat absorption on the surface of the intermediate product, with a temperature difference of about ±5℃. This easily leads to color differences and wrinkles in the final product, affecting product quality and resulting in a defect rate of about 2%. To solve the above problems, in one embodiment, the second hot pressing component 2 is provided with multiple air holes for conveying water vapor from the forming surface of the second hot pressing component 2 to the first cavity 11. The air holes are circular with a diameter of 0.2mm. By providing multiple air holes on the second hot pressing component 2, water vapor can be discharged from multiple directions, thereby reducing the temperature difference on the forming surface and controlling the temperature difference within ±1℃, ensuring the product quality of the extruded product. As an alternative implementation, the air holes can also be square or rhomboid. As an alternative implementation, the diameter of the air holes can also be 0.15mm or 0.25mm; no further limitations are imposed here.

[0045] like Figures 2-3 As shown, in one embodiment, the first hot-pressing member 1 is provided with a first through hole 12 connecting the first cavity 11 to the outside, for discharging water vapor from the first cavity 11. Discharging water vapor through the first through hole 12 can prevent water vapor from adsorbing onto the outer wall of the heating channel 3 and causing corrosion. As an alternative implementation, the first hot-pressing member 1 may also be provided with multiple vent holes for discharging water vapor.

[0046] In one embodiment, the second hot-pressed component 2 is a 3D-printed structure. Using 3D printing technology to process the second hot-pressed component 2 facilitates the creation of air vents and allows for customization of its shape according to the type of product to be extruded. Alternatively, the second hot-pressed component 2 can be machined from permeable steel.

[0047] In one embodiment, the two ends of the heating channel 3 extend out of the first hot pressing member 1 and communicate with the heating member, which is used to heat the heat transfer oil. The heating member is a mold temperature control unit. As an alternative implementation, the heating member can also be other heating devices such as a heat transfer oil heater.

[0048] Among them, such as Figures 2-3 As shown, the first hot-pressing component 1 has a second through hole 13 connecting the first cavity 11 to the outside, and the second hot-pressing component 2 has a third through hole 21 connecting the second cavity to the outside. The end of the heating channel 3 passes through the third through hole 21 and the second through hole 13 in sequence and extends out of the first hot-pressing component 1. As an alternative implementation, the second through hole 13 can be located on the side wall of the first hot-pressing component 1 opposite to the second cavity, in which case the third through hole 21 is not required.

[0049] In one embodiment, the heating channel 3 is a 3D-printed structure. By using 3D printing technology to process the heating channel 3, its shape can be customized according to the shape of the accommodating space. As an alternative implementation, the heating channel 3 can also be composed of multiple segments of straight and bent tubes connected together.

[0050] In one embodiment, the 3D printing material for the heating channel 3 is stainless steel powder. By using stainless steel powder as the material for the heating channel 3, the good thermal stability of the powder prevents the inner wall of the heating channel 3 from rusting during use, thus avoiding any impact on the heating effect. Alternatively, the 3D printing material for the heating channel 3 can also be copper powder or other metal powders; no further limitations are imposed here.

[0051] In one embodiment, the heat-conducting oil placed in the heating channel 3 is an alkylbenzene type heat-conducting oil. As an alternative implementation, the heat-conducting oil placed in the heating channel 3 can also be other heat-conducting materials such as alkylnaphthalene type heat-conducting oil, and no further restrictions are imposed here.

[0052] In one embodiment, the hot press mold includes a temperature measuring element disposed near the forming surface of the second hot press 2, for measuring the temperature of the forming surface. The temperature measuring element is a temperature sensor. By incorporating the temperature measuring element, the real-time temperature of the forming surface can be detected, ensuring that extrusion molding is only performed when the temperature of the forming surface reaches 130°C, thereby improving product quality. As an alternative implementation, the temperature measuring element can also be other temperature measuring structures such as thermocouple sensors; no further limitations are imposed here.

[0053] According to an embodiment of the present invention, another aspect provides a hot pressing system, including: two hot pressing molds as described above, with the forming surfaces of the two second hot pressing parts 2 arranged opposite to each other for pressing the parts to be hot pressed.

[0054] In one embodiment, the hot pressing system includes: two fasteners, with a first hot pressing component 1 fixedly connected to each fastener. Figure 3 As shown, the four ends of the first hot-pressing component 1 are provided with fifth through holes 15, which are fixedly connected to the fixing component by bolts. As an alternative implementation, the fixing component and the first hot-pressing component 1 can also be connected by snap-fit ​​or welded, and no further restrictions are imposed here.

[0055] In one embodiment, the hot pressing system includes a heating element connected to both ends of the heating channel 3. The connector of the mold temperature controller is directly connected to the end of the heating channel 3, which shortens the length of the oil path, thereby increasing the oil flow rate and reducing heat loss.

[0056] In one embodiment, the heating element is electrically connected to a temperature measuring element of the hot press mold to control the heating power of the heating element. By electrically connecting the heating element to the temperature measuring element, the heating power of the heating element can be controlled according to the real-time temperature of the forming surface, thereby ensuring that the temperature of the forming surface is maintained at 130°C.

[0057] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A hot pressing mold, characterized in that, include: The first hot-pressed component (1) is provided with a first concave cavity (11); The second hot press component (2) is disposed in the first cavity (11). The second hot press component (2) is provided with a second cavity. The inner side of the second cavity is provided with a third cavity. The cross-sectional dimension of the third cavity is smaller than that of the second cavity. The second cavity and the third cavity together with the inner wall of the first hot press component (1) form a receiving space. A heating channel (3) is provided in the accommodating space. The heating channel (3) is configured to cooperate with the inner sidewall of the accommodating space. Heat-conducting oil flows and is placed in the heating channel (3) for heating the forming surface of the second hot press (2) away from the second cavity.

2. The hot pressing mold according to claim 1, characterized in that, The heating channel (3) and / or the second hot press (2) are 3D printed structures.

3. The hot pressing mold according to claim 2, characterized in that, The 3D printing material for the heating channel (3) is stainless steel powder.

4. The hot pressing mold according to claim 1, characterized in that, The second hot press (2) is provided with a plurality of air holes for conveying water vapor from the forming surface of the second hot press (2) to the first cavity (11).

5. The hot pressing mold according to claim 4, characterized in that, The first hot press (1) is provided with a first through hole (12) connecting the first cavity (11) to the outside, for discharging the water vapor in the first cavity (11).

6. The hot pressing mold according to any one of claims 1 to 5, characterized in that, The two ends of the heating channel (3) extend out of the first hot pressing member (1) and are connected to the heating member. The heating member is used to heat the heat transfer oil.

7. The hot pressing mold according to any one of claims 1 to 5, characterized in that, The hot pressing mold includes: A temperature measuring element is disposed near the molding surface of the second hot press (2) for measuring the temperature of the molding surface.

8. A hot pressing system, characterized in that, include: The hot press mold according to any one of claims 1 to 7 is provided with two, the forming surfaces of the two second hot press parts (2) are arranged opposite to each other for pressing the hot press parts.

9. The hot pressing system according to claim 8, characterized in that, The hot pressing system includes: The heating element is connected to both ends of the heating channel (3); And / or, two fasteners are provided, and the first hot-pressing member (1) is fixedly connected to the fastener.

10. The hot pressing system according to claim 9, characterized in that, The heating element is electrically connected to the temperature measuring element of the hot pressing mold, and is used to control the heating power of the heating element.

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