Hot press

Abstract

The invention discloses a hot press which comprises a rack, an adjusting lifting mechanism, an upper die heating plate assembly, a lower die heating plate assembly and a lifting driving set. A guide column is arranged on a bottom plate of the rack, the top end of the guide column and a screw are integrally formed and are in threaded connection in a threaded sleeve, the threaded sleeve is installed in a top plate through a bearing and is driven by a first motor through a chain wheel and a chain to rotate, and the height of the top plate is accurately adjusted. The upper die heating plate assembly slides along the guide column through a sliding sleeve and is driven by a second motor to drive a deviation wheel and a swing arm to ascend and descend. The lower die heating plate assembly is provided with a spring buffering mechanism used for absorbing die assembly impact. Heating elements and temperature sensors are arranged in the upper die plate and the lower die plate, cutter structures can be arranged on the edges, and integration of hot pressing and edge cutting is achieved. The device is compact in structure and stable in transmission, can accurately control the mold closing height and temperature, has the advantages of being high in efficiency, high in adaptability, safe and reliable in operation and the like, and is particularly suitable for automatic shaping and trimming machining of paper-plastic industrial package products.

Description

Technical Field

[0001] This invention relates to the field of paper-plastic-paper product processing machinery technology, and in particular to a hot press. Background Technology

[0002] Hot presses are key equipment for shaping and finalizing industrial packaging products in the paper and plastics industry. Traditional models mainly use pressurized pneumatic or hydraulic cylinders for drive, which has significant drawbacks: First, pneumatic and hydraulic drives are slow to respond and have long pressure increase and decrease cycles, limiting equipment operating speed and production efficiency. Second, the mold closing height control precision is insufficient, making it difficult to adapt to different molds and product models, affecting quality consistency. Third, they have limited functionality, separating hot pressing and trimming processes, requiring multiple machines to complete, increasing floor space and costs. Furthermore, hydraulic systems suffer from oil leakage and high maintenance costs, while pneumatic systems are hampered by air source instability. Therefore, there is an urgent need for a high-efficiency, precise, and multifunctional integrated hot press to overcome these shortcomings. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a hot press.

[0004] A hot press according to a first aspect of the present invention is characterized in that it comprises: A frame, on which a base plate is fixedly installed, and on which a plurality of guide posts are erected vertically, and on which a top plate is movably sleeved; An adjustable lifting mechanism, used to adjust the mold closing height, is located on the upper part of the frame and mounted on the top plate. Several threaded sleeves are rotatably fitted inside the top plate via bearings. A driven sprocket is fixedly mounted on the upper end of each threaded sleeve, and a screw is screwed into the inside of each threaded sleeve. The bottom end of the screw is integrally formed with the top end of the guide post. The adjustable lifting mechanism also includes a first motor. A driving sprocket is fixedly mounted on the shaft of the first motor. Several driven sprockets are wound with a chain, and the driving sprocket meshes with the chain. The first motor drives the sprocket-chain mechanism, causing multiple threaded sleeves to rotate synchronously within the top plate, thereby driving the screw integrally formed with the guide post to move relative to the top plate, achieving overall lifting and lowering of the top plate. This mechanical transmission structure avoids pressure fluctuations and leakage problems that may exist in hydraulic or pneumatic systems, ensuring precise and reliable transmission. It achieves precise digital control of the mold closing height, greatly improving the flexibility to adapt to molds of different heights and ensuring consistent product molding quality. The synchronous movement of multiple threaded sleeves ensures horizontal lifting and lowering of the top plate, avoiding uneven loading and making the equipment more stable in operation. Furthermore, the guide pillar not only serves as a supporting structure but also as a guide shaft for the screw and the sliding sleeve on the movable plate. The movable plate slides along the guide pillar via the sliding sleeve, and the upper mold plate achieves precise vertical movement through the guide pillar and the rotating shaft on the movable plate. This integrated design ensures extremely high guiding accuracy of the upper mold heating plate assembly during lifting and lowering, effectively resists off-center loads, guarantees precise alignment of the mold closing, thereby producing dimensionally accurate products and reducing mold wear.

[0005] The upper mold heating plate assembly is located below the top plate and includes a movable plate and an upper template installed on the lower part of the movable plate. The movable plate is provided with a plurality of sliding sleeves that are movably fitted onto the guide post. A rotatable rotating shaft is provided through the upper part of the movable plate, and both ends of the rotating shaft extend to the outside of the movable plate. The lower mold heating plate assembly is located directly below the upper mold heating plate assembly and is disposed on the base plate. It includes a lower mold plate and a spring buffer mechanism installed between the lower mold plate and the base plate. The spring buffer mechanism includes a plurality of vertically installed compression springs. This equipment integrates height adjustment, heating, hot-pressing drive, and buffer protection functions. Both the upper and lower templates are heated and equipped with built-in temperature sensors for precise temperature control. A single machine can complete the entire process from mold adjustment and heating to precise hot pressing, making it suitable for high-quality, high-efficiency production of paper and plastic packaging products. Its excellent adaptability and integration meet the demands of modern manufacturing for flexible and intelligent equipment.

[0006] A lifting drive assembly, used to drive the upper mold heating plate assembly to move up and down, is mounted on the top plate. The lifting drive assembly includes a second motor mounted in the middle of the top plate, a deflector wheel mounted on the rotating shaft of the second motor, and swing arms rotatably mounted at the ends of the deflector wheel and the rotating shaft, respectively. The lifting drive assembly drives the deflector wheel and the swing arms through the second motor, realizing the lifting and pressing action of the upper mold heating plate assembly. A linkage mechanism using the second motor to drive the deflector wheel and the swing arms converts the rotational motion into the linear reciprocating motion of the upper mold heating plate assembly. This purely mechanical transmission method has a fast response speed and a predictable motion trajectory. Simultaneously, a spring buffer mechanism is set between the lower mold plate and the base plate. Compared to hydraulic / pneumatic systems, mechanical drive has a faster cycle time, significantly improving production efficiency. The spring buffer mechanism effectively absorbs the impact energy at the moment of mold closing and provides a buffer stroke, protecting the second motor and transmission mechanism from overload damage caused by foreign objects or mold errors, thus improving the reliability and service life of the equipment.

[0007] According to an embodiment of the present invention, a hot press has at least the following beneficial effects: Based on the first aspect of the present invention, the hot press, by setting an adjusting lifting mechanism composed of a first motor, sprockets and chains, a threaded sleeve, and a guide post top screw, achieves precise, flexible, and synchronous adjustment of the mold closing height, effectively improving the equipment's adaptability to different molds and its adjustment efficiency; the lifting drive group driven by a second motor to drive the deflection wheel and the swing arm has stable transmission and rapid response, significantly improving the cycle time of hot pressing operations and overall production efficiency; simultaneously, the spring buffer mechanism set in the lower mold heating plate assembly can provide effective pressure buffering and protection during mold closing, preventing mechanism jamming or motor overload, enhancing the reliability and safety of equipment operation; the overall structure is compact and reasonable, with each component working in concert, achieving efficient and precise hot pressing and shaping while also having an edge trimming function, simplifying the process flow, and is particularly suitable for the automated, high-quality production of paper and plastic packaging products. This invention combines the precision of motor drive with the reliability of linkage mechanism through ingenious mechanical structure design, and is supplemented with necessary buffer protection. While improving production efficiency, control accuracy and equipment stability, it also enhances safety and adaptability, resulting in significant overall benefits.

[0008] According to some embodiments of the present invention, the upper template and the lower template include a heating plate and a temperature sensor installed inside the heating plate, and the heating plate is provided with a heating element for heating the upper template and the lower template.

[0009] According to some embodiments of the present invention, the mating edges of the upper template and the lower template are provided with a cutting structure.

[0010] According to some embodiments of the present invention, the frame is a frame structure made of welded steel.

[0011] A method for operating a hot press according to a second aspect of the present invention is characterized by comprising the following steps: a. The chain is driven by the drive sprocket on the shaft of the first motor of the adjusting lifting mechanism, thereby driving several of the driven gears to rotate the threaded sleeve, causing the threaded sleeve to rotate relative to the screw, and the threaded structure causes the threaded sleeve to move up and down relative to the guide post integrally formed by the screw, thereby adjusting the relative height of the top plate to set the mold closing height; b. Activate the heating elements of the upper mold heating plate assembly and the lower mold heating plate assembly, and use the temperature sensor to set the heating temperature to the set temperature; c. Place the product to be shaped onto the lower template; d. Start the second motor of the lifting drive group to drive the deflection wheel to rotate, so that the swing arm swings to drive the upper mold heating plate assembly to descend for hot pressing and shaping; e. After the shaping is completed, the upper mold heating plate assembly rises and the product is removed.

[0012] According to an embodiment of the present invention, the working method of a hot press has at least the following beneficial effects: by first adjusting the lifting mechanism to accurately set the mold closing height, and then cooperating with the independent temperature control of the dual heating plate assembly, the parameters of the hot pressing process are accurately adjustable, significantly improving the consistency and adaptability of the product molding quality; subsequently, the lifting drive group is used to realize mechanical swing arm transmission for hot pressing and shaping, with fast action response and stable operation, effectively improving the efficiency of single operation and the stability of continuous production of the equipment; the entire workflow is reasonable and highly automated, achieving efficient and precise hot pressing, while relying on the spring buffer design of the lower mold to effectively absorb the impact of the work, avoiding mechanism jamming or motor overload, which not only ensures the safe and reliable operation of the equipment, but also simplifies the operation process, and is particularly suitable for the high-quality and large-scale production needs of paper and plastic packaging products.

[0013] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the adjusting lifting mechanism according to an embodiment of the present invention.

[0015] 100. Frame; 110. Base plate; 120. Guide column; 130. Top plate; 200. Adjustable lifting mechanism; 210. Threaded sleeve; 220. Passive sprocket; 230. Screw; 240. First motor; 250. Drive sprocket; 260. Chain; 300. Upper mold heating plate assembly; 310. Movable plate; 320. Upper template; 330. Sliding sleeve; 340. Heating plate; 350. Temperature sensor; 360. Heating element; 400. Lower mold heating plate assembly; 410. Lower template; 420. Spring buffer mechanism; 430. Compression spring; 500. Lifting drive assembly; 510. Second motor; 520. Deflecting wheel; 530. Swing arm. Detailed Implementation

[0016] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0017] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0018] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0019] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0020] Reference Figure 1-3 A hot press according to a first aspect of the present invention is characterized in that it comprises: A frame 100, on which a base plate 110 is fixedly installed, and a plurality of guide posts 120 are erected on the base plate 110, and a top plate 130 is movably sleeved on the plurality of guide posts 120. An adjusting lifting mechanism 200, used to adjust the mold closing height, is set on the upper part of the frame 100 and installed on the top plate 130. Several threaded sleeves 210 are rotatably sleeved inside the top plate 130 via bearings. A driven sprocket 220 is fixedly installed at the upper end of the threaded sleeve 210. A screw 230 is screwed into the inside of the threaded sleeve 210. The bottom end of the screw 230 is integrally formed with the top end of the guide post 120. The adjusting lifting mechanism 200 also includes a first motor 240. A driving sprocket 250 is fixedly installed on the rotating shaft of the first motor 240. A chain 260 is wound around the several driven sprockets 220. The driving sprocket 250 is meshed with the chain 260. The upper mold heating plate 340 assembly 300 is located below the top plate 130 and includes a movable plate 310 and an upper template 320 installed on the lower part of the movable plate 310. The movable plate 310 is provided with a plurality of sliding sleeves 330 that are movably sleeved and installed on the guide post 120. A rotatable rotating shaft is provided through the upper part of the movable plate 310, and the two ends of the rotating shaft extend to the outside of the movable plate 310. The lower mold heating plate 340 assembly is located directly below the upper mold heating plate 340 assembly 300 and is disposed on the base plate 110. It includes a lower mold plate 410 and a spring buffer mechanism 420 installed between the lower mold plate 410 and the base plate 110. The spring buffer mechanism 420 includes a plurality of vertically installed compression springs 430. A lifting drive assembly 500 is used to drive the upper mold heating plate 340 assembly 300 to perform lifting and lowering movements. It is installed on the top plate 130. The lifting drive assembly 500 includes a second motor 510 installed in the middle of the top plate 130, a deflecting wheel 520 installed on the rotating shaft of the second motor 510, and a swing arm 530 rotatably installed at both ends of the deflecting wheel 520 and the rotating shaft, respectively. The lifting drive assembly 500 drives the deflecting wheel 520 and the swing arm 530 through the second motor 510 to realize the lifting and pressing movements of the upper mold heating plate 340 assembly 300.

[0021] According to an embodiment of the present invention, a hot press has at least the following beneficial effects: Based on the first aspect of the present invention, the hot press, by setting an adjusting lifting mechanism 200 composed of a first motor 240, a sprocket and chain 260, a threaded sleeve 210, and a top screw 230 of a guide post 120, achieves precise, flexible, and synchronous adjustment of the mold closing height, effectively improving the equipment's adaptability to different molds and its adjustment efficiency; the lifting drive group 500, driven by a second motor 510 to drive the deflection wheel 520 and the swing arm 530, has stable transmission and rapid response, significantly improving the cycle time and overall production efficiency of the hot pressing operation; simultaneously, the spring buffer mechanism 420 set in the lower mold heating plate 340 assembly can provide effective pressure buffering and protection during mold closing, preventing mechanism jamming or motor overload, enhancing the reliability and safety of equipment operation; the overall structure is compact and reasonable, with each component working in concert, achieving efficient and precise hot pressing and shaping while also having an edge trimming function, simplifying the process flow, and is particularly suitable for the automated, high-quality production of paper and plastic packaging products.

[0022] According to some embodiments of the present invention, the upper template 320 and the lower template 410 include a heating plate 340 and a temperature sensor 350 installed inside the heating plate 340. The heating plate 340 contains a heating element 360 for heating the upper template 320 and the lower template 410. The temperature sensor 350 is directly installed inside the heating plate 340, enabling real-time and accurate detection of the actual working temperature of the mold and feeding the signal back to the temperature control system. This system adjusts the power of the heating element 360 to stabilize the mold temperature within a preset optimal process range. This precise temperature control effectively avoids problems such as product charring due to excessively high temperatures or incomplete molding due to insufficient temperatures, ensuring the consistency and reliability of the hot pressing shaping effect. Furthermore, the heating element 360 is built into the heating plate 340, allowing heat to be directly transferred to the template, resulting in a short heat conduction path and minimal heat loss. This structure allows the mold to quickly heat up to the set temperature, reducing pre-production preparation time and improving equipment response speed and production efficiency. Simultaneously, the efficient heating method also helps reduce energy consumption. By modularly integrating heating and temperature measurement functions within the template, the overall structure becomes more compact, reducing complex external piping layouts, lowering the risk of malfunctions due to damage to exposed wiring, and improving equipment stability and lifespan. In summary, this embodiment does not simply incorporate a heating function; rather, through the collaborative design of the built-in heating element 360 and the built-in temperature sensor 350, it achieves precise, efficient, and stable control of the core process parameter—temperature—in the hot pressing process, thus playing a crucial role in improving product quality, production efficiency, and equipment reliability.

[0023] According to some embodiments of the present invention, the mating edges of the upper template 320 and the lower template 410 are provided with a cutting structure.

[0024] This cutting structure integrates hot pressing and shaping with edge trimming and deburring into a single machine, at the same station, and within the same stroke. The workpiece is directly trimmed while still softened by heat, avoiding the need to transfer the semi-finished product to a dedicated edge trimming machine for secondary processing, as is required in traditional methods.

[0025] This significantly shortens the production cycle, reduces equipment investment and floor space, thereby substantially improving overall production efficiency. Because the cutting structure is directly positioned at the edges of the upper and lower templates 410, its relative position to the mold cavity is precisely fixed during manufacturing. This ensures that the cutting action is completed synchronously with product forming during mold closing, avoiding positioning errors that may occur with secondary clamping. Therefore, the product's cutting position is accurate, and the edges are neat, effectively improving the consistency of product dimensional accuracy and appearance quality.

[0026] This integrated cutting mechanism eliminates the need for a separate edge trimming machine, its control system, and conveying mechanism, simplifying the overall structure. This not only reduces manufacturing costs but also minimizes potential failure points caused by increased equipment components, thus improving the stability and reliability of the equipment.

[0027] Trimming during hot pressing utilizes the plastic state of the material after heating, making the trimming process smoother and less resistant, resulting in a smoother cut surface. Simultaneously, one-piece molding trimming avoids cooling and deformation of the semi-finished product during transfer, helping to ensure the shape stability of the final product.

[0028] According to some embodiments of the present invention, the frame 100 is a frame structure welded from steel. During operation, the lifting drive assembly 500 generates significant downward pressure, while the spring buffer mechanism 420 of the lower mold heating plate 340 assembly generates an upward reaction force. The welded steel frame frame 100 effectively resists these complex forces and moments, preventing deformation of the frame 100. This robust base ensures that the guide columns 120 mounted on it maintain precise verticality, thereby guaranteeing the alignment accuracy of the upper mold heating plate 340 assembly 300 and the lower mold heating plate 340 assembly during repeated mold closing processes. This is crucial for producing dimensionally stable products and achieving precise edge trimming. The steel welding used in this embodiment is a mature and economical process in heavy machinery manufacturing, easy to process and manufacture, with controllable costs, meeting the cost-effectiveness requirements of industrial production.

[0029] A method for operating a hot press according to a second aspect of the present invention is characterized by comprising the following steps: a. The chain 260 is driven by the drive sprocket 250 on the shaft of the first motor 240 of the adjusting lifting mechanism 200, thereby driving several of the driven gears to rotate the threaded sleeve 210, causing the threaded sleeve 210 to rotate relative to the screw 230. The threaded structure causes the threaded sleeve 210 to move up and down relative to the guide post 120 integrally formed with the screw 230, thereby adjusting the relative height of the top plate 130 to set the mold closing height. b. Activate the heating elements 360 of the upper mold heating plate 340 assembly 300 and the lower mold heating plate 340 assembly, and use the temperature sensor 350 to set the heating to the set temperature; c. Place the product to be shaped onto the lower template 410; d. Start the second motor 510 of the lifting drive group 500 to drive the deflection wheel 520 to rotate, so that the swing arm 530 swings to drive the upper mold heating plate 340 assembly 300 to descend for hot pressing and shaping; e. After the shaping is completed, the upper mold heating plate 340 assembly 300 rises and the product is removed.

[0030] According to an embodiment of the present invention, the working method of a hot press has at least the following beneficial effects: by first adjusting the lifting mechanism 200 to accurately set the mold closing height, and then cooperating with the independent temperature control of the double heating plate 340 assembly, the parameters of the hot pressing process are accurately adjustable, significantly improving the consistency and adaptability of the product molding quality; subsequently, the lifting drive group 500 is used to realize the mechanical swing arm 530 transmission for hot pressing and shaping, with fast action response and stable operation, effectively improving the efficiency of single operation and the stability of continuous production of the equipment; the entire workflow is reasonable and highly automated. While achieving efficient and precise hot pressing, the spring buffer design of the lower mold effectively absorbs the impact of the work, avoiding mechanism jamming or motor overload, which not only ensures the safe and reliable operation of the equipment, but also simplifies the operation process, making it particularly suitable for the high-quality and large-scale production needs of paper and plastic packaging products.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A hot press, characterized in that, include: A frame (100) is fixedly installed on the frame (100), and a number of guide posts (120) are erected on the base plate (110), and a top plate (130) is movably sleeved on the number of guide posts (120). An adjusting lifting mechanism (200) is used to adjust the mold closing height. It is set on the upper part of the frame (100) and installed on the top plate (130). Several threaded sleeves (210) are rotatably sleeved in the top plate (130) through bearings. A driven sprocket (220) is fixedly installed at the upper end of the threaded sleeve (210). A screw (230) is screwed into the inside of the threaded sleeve (210). The bottom end of the screw (230) is integrally formed with the top end of the guide post (120). The adjusting lifting mechanism (200) also includes a first motor (240). An active sprocket (250) is fixedly installed on the rotating shaft of the first motor (240). A chain (260) is wound around several driven sprockets (220). The active sprocket (250) is meshed with the chain (260). The upper mold heating plate (340) assembly (300) is located below the top plate (130) and includes a movable plate (310) and an upper template (320) installed on the lower part of the movable plate (310). The movable plate (310) is provided with a plurality of sliding sleeves (330) that are movably sleeved and installed on the guide post (120). A rotatable shaft is provided through the upper part of the movable plate (310), and both ends of the shaft extend to the outside of the movable plate (310). The lower mold heating plate (340) assembly is located directly below the upper mold heating plate (340) assembly (300) and is located on the bottom plate (110). It includes a lower template (410) and a spring buffer mechanism (420) installed between the lower template (410) and the bottom plate (110). The spring buffer mechanism (420) includes a plurality of vertically installed compression springs (430). A lifting drive assembly (500) is used to drive the upper mold heating plate (340) assembly (300) to perform lifting and lowering movements. It is installed on the top plate (130). The lifting drive assembly (500) includes a second motor (510) installed in the middle of the top plate (130), a deflector wheel (520) installed on the rotating shaft of the second motor (510), and a swing arm (530) rotatably installed at both ends of the deflector wheel (520) and the rotating shaft, respectively. The lifting drive assembly (500) drives the deflector wheel (520) and the swing arm (530) through the second motor (510) to realize the lifting and pressing movements of the upper mold heating plate (340) assembly (300).

2. The hot press according to claim 1, characterized in that: The upper template (320) and the lower template (410) include a heating plate (340) and a temperature sensor (350) installed inside the heating plate (340). The heating plate (340) is provided with a heating element (360) for heating the upper template (320) and the lower template (410).

3. The hot press according to claim 1, characterized in that: The mating edges of the upper template (320) and the lower template (410) are provided with a cutting structure.

4. The hot press according to claim 1, characterized in that: The frame (100) is a frame structure made of welded steel.

5. The working method of a hot press according to claims 1-4, characterized in that, Includes the following steps: a. The chain (260) is driven by the drive sprocket (250) on the shaft of the first motor (240) of the adjusting lifting mechanism (200), thereby driving several of the driven gears to rotate the threaded sleeve (210), causing the threaded sleeve (210) to rotate relative to the screw (230), and the threaded structure causes the threaded sleeve (210) to move up and down relative to the guide post (120) integrally formed with the screw (230), thereby adjusting the relative height of the top plate (130) to set the mold closing height; b. The heating elements (360) of the upper mold heating plate (340) assembly (300) and the lower mold heating plate (340) assembly are activated, and the temperature sensor (350) is used to set the heating to the set temperature; c. Place the product to be shaped on the lower template (410); d. Start the second motor (510) of the lifting drive group (500) to drive the deflection wheel (520) to rotate, so that the swing arm (530) shakes to drive the upper mold heating plate (340) assembly (300) to descend for hot pressing and shaping; e. After the shaping is completed, the upper mold heating plate (340) assembly (300) rises and the product is taken out.

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