A plastic film compression molding mold

Abstract

The utility model discloses a kind of plastic film die forming mould, it is related to plastic processing equipment technical field, including upper die, lower die, pressure column and the forming assembly being set between upper die and lower die, the forming assembly includes the center block group that is alternately arranged by several center block A and several center block B;Cooling waterway is opened in the center block B inside;The left and right mould is provided on the both sides of the forming assembly, the left and right mould inside is equipped with limit block.The utility model solves the long-term technical bottleneck of traditional compression forming mould in cooling uniformity, cavity sealing property and structural rigidity, realizes the technical effect that cooling is uniform, structure is stable, can produce high-quality fluorine plastic product.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing equipment technology, specifically to a plastic film compression molding die. Background Technology

[0002] Meltable fluoroplastics, such as FEP, PVDF, and PFA, are widely used in high-end fields such as semiconductors, medical devices, and chemicals due to their excellent chemical stability, high-temperature resistance, and insulation properties. These materials are typically produced through injection molding or compression molding. For compression molding, especially when producing products requiring high surface flatness (such as films) or multi-layered structures, existing mold structures often suffer from problems such as low cooling efficiency, uneven temperature field, insufficient overall mold rigidity, and uneven cavity pressure. This leads to quality risks such as product warping, surface defects, and non-dense internal structures. Therefore, there is an urgent need for a new mold structure that can solve the above problems. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a plastic film compression molding die to overcome the long-standing technical bottlenecks of traditional compression molding dies in terms of cooling uniformity, cavity sealing and structural rigidity, and to achieve the technical effects of uniform cooling, stable structure and production of high-quality fluoroplastic products.

[0004] To solve the above problems, the technical solution provided by this utility model is as follows:

[0005] A plastic film compression molding die includes an upper die, a lower die, a pressure column, and a molding component disposed between the upper die and the lower die. The molding component includes a group of center blocks consisting of alternating arrangements of a plurality of center blocks A and a plurality of center blocks B. Cooling water channels are provided inside the center blocks B. Left and right molds are provided on both sides of the molding component, and limiting blocks are provided on the inner sides of the left and right molds.

[0006] The core function of the alternating arrangement of center blocks A and B is to distribute the cooling system (cooling water channel B) discretely and evenly throughout the molding area while bearing pressure, avoiding the uneven temperature and internal stress problems caused by concentrated cooling areas in traditional molds. The cooling water channel inside center block B directly introduces a cooling medium (such as water) to actively and efficiently remove the heat released during the plastic film molding process, making it a key functional structure for achieving rapid and uniform cooling. The limiting blocks on the inner sides of the left and right molds function to achieve precise positioning and lateral sealing. During assembly, they fit tightly against both ends of the center block assembly, ensuring alignment of all center blocks to form a continuous and flat cavity wall; and preventing molten plastic material from leaking from the sides of the center block assembly during high-pressure pressing, thus guaranteeing the cavity's sealing and molding pressure.

[0007] Optionally, the left and right molds are provided with left and right cooling water channels.

[0008] The active cooling zone is extended from the central area (center block B) to the left and right edges of the mold. This is crucial for the molding of large-area plastic films because it solves the problem of inconsistent cooling rates caused by different heat dissipation rates at the mold edges. Through the left and right cooling water channels, precise temperature management can be achieved on both sides of the mold, ensuring that the entire plastic film cools and shrinks at a similar rate from the center to the edge, effectively preventing defects such as warping and deformation caused by uneven cooling.

[0009] Optionally, the two side planes of the central block A and the central block B have high flatness.

[0010] This directly ensures the surface quality of the final product (plastic film). The two side planes of center block A and center block B directly contact and shape the surface of the plastic film. The flatness of these planes is transferred to the plastic film in a 1:1 ratio. If the flatness is poor, and there are unevennesses, the surface of the formed film will correspondingly have defects, textures, or roughness.

[0011] Optionally, the flatness of the two side planes of the central block A and the central block B is ≤0.01mm.

[0012] High flatness (≤0.01mm) ensures an extremely smooth and flat contact surface, a prerequisite for producing high-end optical and electronic grade plastic films. Furthermore, high flatness guarantees the seal at the joints after adjacent center blocks are spliced ​​together, working in conjunction with the limiting blocks to further prevent material leakage.

[0013] Optionally, the lower mold is provided with a groove for accommodating and fixing the molding component, the upper mold is provided with a groove that cooperates with the lower mold, and the upper mold is also provided with a feeding area located directly above the center block assembly.

[0014] The positioning, fixing, and feeding functions of the mold are defined.

[0015] Optionally, the pressure column can be movably disposed within the feeding zone.

[0016] The grooves in the lower and upper molds function as a "nest" or "clamp" to precisely accommodate and clamp the molding assembly composed of multiple individual parts (center block group, left and right molds, front and rear molds), making it a rigid, integrated structure under high pressure and preventing misalignment or loosening of the parts. The feeding area of ​​the upper mold provides a dedicated channel and space for injecting plastic material into the cavity below; it is the core structure for achieving the feeding function. The pressure column works in conjunction with the feeding area to transmit and concentrate the pressure from the external pressure equipment onto the plastic material, compressing, melting, and filling the entire cavity.

[0017] Optionally, the molding assembly may also include front and rear molds disposed at the front and rear ends of the central block assembly.

[0018] The function of the front and rear molds is to close the two openings of the cavity formed by the center block assembly and the left and right molds, together with the left and right molds and the center block assembly, to form a complete, closed rectangular (or specific-shaped) cavity. They provide additional sealing surfaces to prevent plastic material from leaking from the front and rear ends, and determine the size and shape of the plastic film in the front-to-back direction.

[0019] Alternatively, the plastic material may be a fusible fluoroplastic.

[0020] Its function is to clearly define the mold's specificity and optimal application range. The unique design of this invention (especially the alternating cooling and high-pressure sealing) is optimized for the molding characteristics of fusible fluoroplastics (such as FEP, PFA, etc.) (e.g., high melt viscosity, specific crystallization behavior, and requirements for high temperature and cleanliness). These materials are typically used in high-performance applications and have extremely low tolerance for product defects (such as bubbles, warpage, and surface irregularities). This mold is designed to solve these challenging molding problems.

[0021] Optionally, the fusible fluoroplastic is FEP, PVDF, PFA, ETFE, or ECTFE.

[0022] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0023] By alternating the design of center block A and center block B, and adding cooling water channels in the left and right molds, a multi-dimensional and efficient cooling system is formed, which greatly improves cooling efficiency and uniformity.

[0024] The limiting blocks on the inner sides of the left and right molds enhance the overall rigidity and sealing of the mold after assembly, effectively preventing material leakage from the cavity and ensuring product density.

[0025] This structure is particularly suitable for the production of fluoroplastic films that require extremely high surface flatness. Attached Figure Description

[0026] Figure 1 A cross-sectional view of a plastic film compression molding die provided for an embodiment of this utility model;

[0027] Figure 2 An assembly drawing of a plastic film compression molding die provided for an embodiment of this utility model;

[0028] Figure 3 An exploded view of a plastic film compression molding die provided for an embodiment of this utility model;

[0029] Figure 4A schematic diagram of the structure of the central block A of a plastic film compression molding die proposed for an embodiment of this utility model;

[0030] Figure 5 A schematic diagram of the structure of the central block B of a plastic film compression molding die proposed for an embodiment of this utility model;

[0031] Figure 6 A schematic diagram of the left and right molds of a plastic film compression molding die provided for an embodiment of this utility model;

[0032] Figure 7 A schematic diagram of the front and rear molds of a plastic film compression molding die provided for an embodiment of this utility model;

[0033] Figure 8 A schematic diagram of the lower mold of a plastic film compression molding die provided for an embodiment of this utility model;

[0034] Figure 9 A schematic diagram of the structure of the upper mold of a plastic film compression molding die proposed for an embodiment of this utility model;

[0035] Figure 10 A schematic diagram of the pressure column of a plastic film compression molding die proposed for an embodiment of this utility model;

[0036] Figure 11 A schematic diagram of the process of a plastic film compression molding die proposed for an embodiment of this utility model;

[0037] 1. Plastic material; 11. Plastic film; 2. Center block; 21. Center block A; 22. Center block B; 221. Cooling water channel B; 3. Left and right molds; 31. Limiting block; 32. Left and right cooling water channels; 4. Front and rear molds; 5. Lower mold; 6. Upper mold; 7. Pressure column. Detailed Implementation

[0038] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0039] Example

[0040] Combined with appendix Figure 1-3 A plastic film compression molding die includes an upper mold 6, a lower mold 5, a pressure column 7, and a molding component disposed between the upper mold 6 and the lower mold 5. The molding component includes a group of 2 central blocks consisting of alternating central blocks A21 and central blocks B22; cooling water channels are provided inside the central blocks B22; left and right molds 3 are provided on both sides of the molding component, and limiting blocks 31 are provided inside the left and right molds 3.

[0041] During mold assembly, the operator alternates between center blocks A21 and B22, like building a wall, to form a "central wall." The left and right molds 3 clamp this "central wall" from both sides via their inner limiting blocks 31, thus completing the assembly of the molding component. Subsequently, the entire molding component is placed in the groove of the lower mold 5 and pressed and fixed by the upper mold 6. During the pressing process, molten plastic material 1 fills the cavity formed by the center block set 2, the left and right molds 3, and the front and rear molds 4. The cooling water channels within center block B22 begin operating, and the flowing cooling water, through heat exchange with the metal mold body, continuously carries away the heat from the plastic material 1, causing it to gradually cool and solidify from a molten state. The limiting blocks 31 bear lateral forces throughout the process, ensuring that the center block set 2 does not shift under pressure, maintaining the stability and sealing of the cavity shape.

[0042] The left and right molds 3 are equipped with left and right cooling water channels 32. Their operating principle is the same as the cooling water channels in the central block B22, but they manage different areas. During the later stages of the pressing process, the cooling water flowing into the left and right cooling water channels 32 begins to work, specifically targeting the left and right sides of the mold for enhanced cooling. Working in conjunction with the cooling system of the central block B22, it forms a more three-dimensional and uniform cooling network covering the core and edges of the molding area, allowing the heat across the entire cross-section of the plastic film 11 to be removed synchronously and efficiently.

[0043] The two side planes of center blocks A21 and B22 have high flatness. The flatness of the two side planes of center blocks A21 and B22 is ≤0.01mm. This is the static precision requirement achieved during the manufacturing and assembly stages. The mold manufacturer needs to process the two side working surfaces of each center block A21 and B to the specified extremely high flatness (e.g., ≤0.01mm) through precision grinding, lapping, and other machining processes. During assembly, these high-precision planes fit tightly together, forming a continuous, seamless, and smooth inner wall of the cavity. When molten plastic fills the cavity under high pressure, it cannot penetrate the microscopic unevenness, thus replicating an equally smooth and flat surface.

[0044] The lower mold 5 is provided with a groove for accommodating and fixing the molding components, the upper mold 6 is provided with a groove that cooperates with the lower mold 5, and the upper mold 6 is also provided with a feeding area located directly above the central block 2.

[0045] The pressure column 7 is movably positioned within the feeding area. The operation process is as follows: First, the assembled molding component is placed into the groove of the lower mold 5, at which point the molding component is initially positioned. Then, the upper mold 6 is closed, and the grooves of the upper mold 6 and the lower mold 5 work together to completely clamp and fix the molding component from multiple directions (top, bottom, left, and right). Subsequently, a fixed amount of plastic material 1 is added into the mold through the feeding area of ​​the upper mold 6. Finally, the pressure column 7 is placed in the feeding area, and the pressure device is activated to press down the pressure column 7. The pressure column 7 applies force directly to the plastic material 1, causing it to flow downwards, completely filling the cavity, and maintaining the pressure until cooling and solidification are complete.

[0046] The molding assembly also includes front and rear molds 4 located at the front and rear ends of the central block 2 group. During assembly, the front and rear molds 4 are installed at the front and rear ends of the central block 2 group. Similar to the left and right molds 3, they achieve a seal through a tight fit. This forms a cavity that is completely closed in all directions (vertically by the central block 2 itself, horizontally by the left and right molds 3, and front and rear by the front and rear molds 4), providing a precise and sealed space for molding the plastic material 1.

[0047] Plastic material 1 is a fusible fluoroplastic. Fusible fluoroplastics include FEP, PVDF, PFA, ETFE, or ECTFE. This is not a principle of mechanical structure operation, but rather a principle of material and equipment compatibility. The mold's cooling system is designed to effectively manage the cooling curve during fluoroplastic molding, reducing internal stress; its high-precision sealing structure can withstand the high pressure required for fluoroplastic molding and prevent leakage; its overall structure is suitable for the processing temperature and environment required for fluoroplastics. Therefore, when using this mold to process specific fluoroplastics, its technical advantages (high product quality) are most significant and outstanding.

[0048] Combined with appendix Figure 11 Process flow:

[0049] 1. Place the lower mold 5 on the work station.

[0050] 2. Place the front and rear molds 4 on the lower mold 5.

[0051] 3. Fix the left and right molds 3 into the grooves of the front and rear doors.

[0052] 4. Insert the center block 2 into the limiting block 31 of the left and right molds 3, and connect the center block 2 with the cooling water channel to the cooling water channel of the left and right molds 3.

[0053] 5. Place the upper mold 6 on the center block 2 and fix the upper and lower molds 5 and the left and right molds 3 in place.

[0054] 6. Place the plastic material 1 into the feeding area of ​​the upper mold 6 and evenly place it on the center block 2.

[0055] 7. After the mold and materials are preheated, place the pressure column 7 inside the upper mold 6.

[0056] 8. The pressure column 7 is slowly pressed down to fill the material cavity in the middle of the central block 2 with molten plastic material 1. During this process, water is circulated in the cooling water channel to cool and solidify the product.

[0057] 9. Lift the pressure column by 7.

[0058] 10. Remove the upper mold 6.

[0059] 11. Remove the lower mold 5.

[0060] 12. Remove the front and rear molds 4.

[0061] 13. Remove the left and right molds 3.

[0062] 14. Remove the center block 2 according to the plane direction of the plastic film 11 and separate the product from the mold. After the plastic film 11 is removed, it is transferred to the post-processing area and the mold proceeds to the next production cycle.

[0063] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A plastic film compression molding die, characterized in that, It includes an upper mold, a lower mold, a pressure column, and a molding component disposed between the upper mold and the lower mold. The molding component includes a group of center blocks consisting of several center blocks A and several center blocks B arranged alternately. Cooling water channels are opened inside the center blocks B. Left and right molds are disposed on both sides of the molding component, and limiting blocks are provided on the inner side of the left and right molds.

2. The plastic film molding die according to claim 1, characterized in that, The left and right molds are equipped with left and right cooling water channels.

3. The plastic film molding die according to claim 1, characterized in that, The two side planes of the central block A and the central block B have high flatness.

4. The plastic film molding die according to claim 3, characterized in that, The flatness of the two side planes of the central block A and the central block B is ≤0.01mm.

5. A plastic film molding die according to claim 1, characterized in that, The lower mold is provided with a groove for accommodating and fixing the molding component, the upper mold is provided with a groove that cooperates with the lower mold, and the upper mold is also provided with a feeding area located directly above the center block assembly for injecting plastic material into the cavity below.

6. A plastic film molding die according to claim 5, characterized in that, The pressure column is movably disposed within the feeding area.

7. A plastic film compression molding die according to claim 1, characterized in that, The molding assembly also includes front and rear molds disposed at the front and rear ends of the central block assembly.

8. A plastic film compression molding die according to claim 5, characterized in that, The plastic material is a fusible fluoroplastic.

9. A plastic film compression molding die according to claim 8, characterized in that, The fusible fluoroplastic is FEP, PVDF, PFA, ETFE, or ECTFE.

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