A mould for plastic tabletting sample

Abstract

The utility model discloses a kind of for plastic tabletting sample preparation mould, belong to plastic processing equipment technical field.It include mould main part, be provided with the hot melt groove for providing hot melt processing space for plastic particle, the fixed block is equipped in this hot melt groove;Adjusting assembly, including being located in hot melt groove, mobile block can slide along its front and back, threaded rod that drives mobile block to move back and forth, one end of this threaded rod is connected with mobile block, the other end penetrates fixed block, the internal thread that is engaged with threaded rod is opened in this fixed block, synchronous front and back movement under the rotation condition of threaded rod is realized.The mould of the utility model is designed through mould main body and adjusting assembly, solve existing plastic tabletting sample preparation mould sample preparation flexibility is poor, discard the mode of different specifications sample piece need to replace corresponding mould, to be able to realize the preparation of different size plastic sample;And simultaneously, exhaust hole is set to reduce sample piece bubble, the generation of cavity.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing equipment technology, and in particular to a mold for plastic sheeting and sample preparation. Background Technology

[0002] Plastic tableting molds are specialized tooling used in plastic particle testing and experimental research and development, specifically in conjunction with flatbed vulcanizers / tablet presses. Their core purpose is to melt and press plastic particles into standard, uniform thin sheet samples for various performance tests. They are indispensable tools for particle formulation development, incoming material quality inspection, and modification comparison.

[0003] Its production process is as follows:

[0004] 1. Weigh the plastic particles and place them into the mold cavity;

[0005] 2. Place the mold into the heated tablet press and heat it to the resin melting temperature;

[0006] 3. Apply constant pressure to fuse and flatten the particles, then maintain heat and pressure to set the shape;

[0007] 4. After cooling and opening the mold, remove the flat, bubble-free, and uniformly thick plastic sheet.

[0008] Existing plastic sheeting molds are standardized and then cut into the required shapes. Each mold only has a fixed cavity size, while multiple sets of molds are needed for making tensile samples, translucent thin sheets, impact thick sheets, and infrared micro-samples, resulting in high procurement costs and space-consuming storage.

[0009] Based on this, the structure of the plastic compression mold is optimized to enable the preparation of plastic samples of different sizes. Utility Model Content

[0010] Purpose of the utility model: The technical problem to be solved by this utility model is to provide a plastic sheeting mold that can prepare plastic samples of different sizes.

[0011] Technical solution: The present invention relates to a mold for preparing plastic tablets, the mold comprising:

[0012] The mold body has a hot melt groove for providing a hot melt processing space for plastic particles, and a fixing block is provided inside the hot melt groove;

[0013] The adjustment assembly includes a movable block located in the hot melt tank and capable of sliding back and forth therein, and a threaded rod that drives the movable block to move back and forth. One end of the threaded rod is connected to the movable block, and the other end passes through a fixed block. The fixed block has an internal thread that meshes with the threaded rod, thereby enabling the threaded rod to rotate and move back and forth.

[0014] Furthermore, the moving block of the mold has several vent holes through it.

[0015] Furthermore, the mold also includes a second fixed block located between the moving block and the fixed block to assist the rotation and synchronous movement of the threaded rod. The second fixed block has an internal thread that meshes with the threaded rod.

[0016] Furthermore, the mold also includes a hot-pressing top plate located on the top of the mold body, and a guide block is provided on the mold body. The hot-pressing top plate is provided with a guide groove that cooperates with the guide block on the mold body.

[0017] Furthermore, the mold also includes a sealing plate located on one side of the mold body, a first connecting plate fixed to one side of the sealing plate, and a second connecting plate that is connected to the first connecting plate on one side of the mold body. The first connecting plate and the second connecting plate are connected by bolts.

[0018] Furthermore, the mold's sealing plate is provided with a guide block, and the hot-pressing top plate is provided with a guide groove that cooperates with the guide block on the sealing plate.

[0019] Furthermore, the threaded rod of the mold and the moving block are stably connected by bearings.

[0020] Beneficial effects: Compared with the prior art, the advantages of this utility model are that the mold solves the problem of poor sample preparation flexibility of existing plastic compression molds through the coordinated design of the mold body and adjustment components, and eliminates the mode of needing to change the corresponding mold for different specifications of sample pieces, so as to realize the preparation of plastic samples of different sizes; at the same time, it is equipped with venting holes to reduce the generation of air bubbles and voids in the sample pieces. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the mold of this utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the mold of this utility model. Figure 1 ;

[0023] Figure 3 This is a schematic diagram of the internal structure of the mold of this utility model. Figure 2 ;

[0024] Figure descriptions: 1-Mold body; 2-Hot melt groove; 3-Fixing block; 4-Moving block; 5-Threaded rod; 6-Vent hole; 7-Second fixing block; 8-Hot pressing top plate; 9-Guide block; 10-Sealing plate; 11-First connecting plate; 12-Second connecting plate; 13-Bolt. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings.

[0026] like Figure 1 and Figure 2 As shown, the mold of this utility model for plastic tablet sample preparation includes a mold body 1 and an adjustment component.

[0027] Specifically, the top of the mold body 1 is provided with a hot-pressing top plate 8. A sealing plate 10 is provided on the side of the mold body 1. A hot melt groove 2 is provided inside the mold body 1 to provide space for the hot melt processing of plastic granules. A fixing block 3 is provided inside the hot melt groove 2 of the mold body, and the fixing block 3 is fixed to the inner wall of the hot melt groove 2. A first connecting plate 11 is fixed to one side of the sealing plate 10, and a second connecting plate 12 is provided on one side of the mold body 1. The second connecting plate 12 and the first connecting plate 11 are connected by bolts 13 to ensure the stability of the connection. The sealing plate 10 provides a detachable seal on the side of the hot melt groove 2. The sealing plate 10 fits against the side seam of the mold body 1, sealing the side opening of the hot melt groove 2 and preventing the plastic in the hot melt state from leaking out from the seam. The first connecting plate 11 is rigidly connected to the sealing plate 10, and the second connecting plate 12 is welded and fixed to the surface of the mold body 1. The two are locked and fixed by bolts 13 to ensure uniform sealing pressure and facilitate the disassembly of the sealing plate 10 for internal cleaning and maintenance of the mold.

[0028] The adjustment assembly includes a movable block 4 located within the hot melt bath 2 and capable of sliding back and forth thereal, and a threaded rod 5 that drives the movable block 4 to move back and forth. One end of the threaded rod 5 is connected to the movable block 4, and the other end passes through a fixed block 3. The fixed block 3 has an internal thread that meshes with the threaded rod 5, enabling synchronous back and forth movement of the threaded rod 5 under rotational conditions. The threaded rod 5 and the movable block 4 are stably connected by bearings. The drive of the threaded rod enables precise adjustment of the internal gap of the hot melt bath 2. The cooperation between the threaded rod 5 and the fixed block 3 allows the rotational motion to be converted into linear motion through threaded transmission, driving the movable block 4 at the end to move axially, thereby adjusting the internal width of the hot melt bath 2 to adapt to the hot pressing forming requirements of workpieces of different thicknesses.

[0029] Furthermore, to further assist in increasing the linear motion of the threaded rod, a second fixed block 7 can be added between the moving block 4 and the fixed block 3 to assist the threaded rod 5 in rotating and moving synchronously, such as... Figure 3 As shown. Similarly, the second fixing block 7 has an internal thread that meshes with the threaded rod 5, thus preventing the second fixing block 7 from continuing to function when the fit between the fixing block 3 and the threaded rod 5 fails. A non-slip handle can be fixedly installed on one side of the threaded rod 5 to increase the grip friction between the threaded rod and the worker's hand. The non-slip handle is ergonomically designed with a surface covered with non-slip textures, significantly improving hand grip friction. This allows workers to manually rotate the threaded rod to adjust the gap without special tools, making the adjustment operation labor-saving and convenient, while also allowing for precise control of the adjustment amount to ensure gap adjustment accuracy.

[0030] Several vent holes 6 are provided through the movable block 4. During sample preparation, the threaded rod 5 can be rotated repeatedly in both directions to move it back and forth, promoting the rapid discharge of air trapped inside the plastic through the vent holes 6 on the surface of the movable block 4. The adjustment range can be adjusted according to actual needs, following the purpose of fine-tuning.

[0031] In addition to the aforementioned components, the mold also includes a hot-pressing top plate 8 located at the top of the mold body 1. Guide blocks 9 are provided on the mold body 1 at its two corners. The sealing plate 10 also has guide blocks 9. The hot-pressing top plate 8 has guide grooves that mate with the guide blocks 9. The hot-pressing top plate 8 provides pressure transmission and mold closing guidance for the hot-pressing process. The hot-pressing top plate 8 can be made of high-strength heat-resistant alloy steel, which can evenly transmit the pressure and heat of the hot-pressing equipment, ensuring uniform heating and pressure distribution across all parts of the workpiece. During mold closing, the guide blocks 9 precisely engage with the guide grooves of the hot-pressing top plate 8, limiting the horizontal displacement of the hot-pressing top plate 8, preventing misalignment of the upper and lower molds, and ensuring mold closing accuracy and product forming quality.

[0032] During use, in the sample preparation stage, according to the thickness requirements of the target sample, rotate the threaded rod 5 along the inner wall of the fixed block 3. The rotational motion is converted into linear motion through the threaded transmission, pushing the moving block 4 to move along the inner wall of the hot melt groove 2, and precisely adjusting the internal width of the hot melt groove 2. After adjustment, attach the sealing plate 10 to the side seam of the mold body 1, and lock and fix the first connecting plate 11 and the second connecting plate 12 with the connecting bolts 13 to seal the side opening of the hot melt groove 2 and prevent plastic overflow during the hot melting process.

[0033] The weighed plastic granules are evenly poured into the hot melt tank 2 of the mold body 1. The hot press plate 8 is then closed, and the guide block 9 precisely matches the guide groove on the top of the hot press plate 8 to limit the horizontal displacement of the hot press plate 8 and ensure mold closing accuracy. The hot press equipment is started, and the hot press plate 8 applies downward pressure and transfers heat, causing the plastic granules in the hot melt tank 2 to gradually melt.

[0034] During the hot-melt process, repeated venting can be performed depending on the requirements of the plastic raw materials. After pressing, heating is stopped and pressure is maintained. Once the sample has cooled and solidified, the hot-press top plate 8 is opened, the connecting bolts 13 are loosened, and the sealing plate 10 is removed. The threaded rod 5 is rotated to move the moving block 4 forward, pushing the molded plastic sample out of the side opening of the hot-melt tank 2, completing the demolding. After demolding, the plastic residue remaining on the inner wall of the hot-melt tank 2 is cleaned, and the device returns to its initial state, ready for the next sample preparation cycle.

Claims

1. A mold for preparing plastic tablets, characterized in that, The mold includes: The mold body (1) has a hot melt groove (2) for providing a hot melt processing space for plastic particles, and a fixing block (3) is provided in the hot melt groove (2); The adjustment assembly includes a movable block (4) located in the hot melt tank (2) and slidable back and forth therein, and a threaded rod (5) that drives the movable block (4) to move back and forth. One end of the threaded rod (5) is connected to the movable block (4), and the other end passes through the fixed block (3). The fixed block (3) has an internal thread that meshes with the threaded rod (5), so as to realize the rotation and back and forth movement of the threaded rod (5).

2. The mold for preparing plastic sheet samples according to claim 1, characterized in that, The movable block (4) has several exhaust holes (6) through it.

3. The mold for preparing plastic sheet samples according to claim 1, characterized in that, The mold also includes a second fixed block (7) located between the moving block (4) and the fixed block (3) to assist the threaded rod (5) in rotating and moving synchronously. The second fixed block (7) has an internal thread that meshes with the threaded rod (5).

4. The mold for preparing plastic sheet samples according to claim 1, characterized in that, The mold also includes a hot press plate (8) located on the top of the mold body (1), and a guide block (9) is provided on the mold body (1). The hot press plate (8) is provided with a guide groove that cooperates with the guide block (9) on the mold body (1).

5. The mold for preparing plastic tablets according to claim 4, characterized in that, The mold also includes a sealing plate (10) located on one side of the mold body (1). A first connecting plate (11) is fixed on one side of the sealing plate (10). A second connecting plate (12) is provided on one side of the mold body (1) to form a mating connection with the first connecting plate (11). The first connecting plate (11) and the second connecting plate (12) are connected by bolts (13).

6. The mold for preparing plastic tablets according to claim 5, characterized in that, The sealing plate (10) is provided with a guide block (9), and the hot-pressing top plate (8) is provided with a guide groove that cooperates with the guide block (9) on the sealing plate (10).

7. The mold for preparing plastic sheet samples according to claim 1, characterized in that, The threaded rod (5) and the moving block (4) are stably connected by bearings.

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