Variable dual cavity coating die

Abstract

This invention provides a variable dual-cavity coating die head, comprising an upper die body, a lower die body, and a gasket. The top surface of the lower die body has a recessed cavity along its width. A feeding channel communicating with the rear of the cavity is located in the middle of the rear side of the lower die body. A series of mounting cavities are evenly spaced along the width of the bottom surface of the cavity. Each mounting cavity has a flow block or a flow divider connected to its bottom via positioning screws. The top surface of the flow block is aligned with the bottom surface of the cavity. The top surface of the flow divider extends out of the cavity, its height being flush with the top surface of the lower die body. The flow divider divides the cavity into two regions: the cavity behind the flow divider forms a primary flow cavity, and the cavity in front of the flow divider forms a secondary flow cavity. Molten raw material enters the primary flow cavity through the feeding channel, is divided by the flow divider on both sides, enters the secondary flow cavity, and is finally extruded from the front die lip. This invention can improve the uniformity of raw material distribution and prevent material accumulation and retention on both sides.

Description

Technical Field

[0001] This invention relates to a coating die, and more particularly to a variable dual-cavity coating die. Background Technology

[0002] Currently, the design of coating dies on the market is generally quite simple, consisting only of an inlet and a single-cavity flow channel. In this case, when the coating width is long, the flow rate at the sides is usually slower than in the center. Furthermore, when the coating width is smaller than the flow channel width, conventional coating dies may experience material stagnation at both ends of the cavity, failing to be discharged in a timely manner. Summary of the Invention

[0003] To address the aforementioned problems, this invention aims to provide a variable dual-cavity coating die head, which can improve the uniformity of raw material distribution and prevent the accumulation and retention of materials on both sides.

[0004] The technical solution of this invention is a variable dual-cavity coating die head, including an upper die body and a lower die body. A gasket is provided between the upper die body and the lower die body. A recessed cavity is provided on the top surface of the lower die body along the width direction. A feeding channel communicating with the rear of the cavity is provided in the middle of the rear side of the lower die body. A series of mounting cavities are provided at equal intervals along the width direction on the bottom surface of the middle of the cavity. A flow block or a flow divider is connected to the bottom of each mounting cavity by a positioning screw. The top surface of the flow block is adapted to the height of the bottom surface of the cavity. After the top surface of the flow divider extends out of the cavity, its top surface height is flush with the top surface of the lower die body. The flow divider divides the cavity into two regions, front and rear. The cavity behind the flow divider forms a primary flow cavity, and the cavity in front of the flow divider forms a secondary flow cavity. The molten raw material reaches the primary flow cavity after passing through the feeding channel, enters the secondary flow cavity after being divided by the left and right sides of the flow divider, and is finally extruded from the front die lip.

[0005] Preferably, there are multiple flow dividers and at least one flow leveler. After being split into left and right flows by the flow dividers, the molten raw material reaches the secondary flow cavity from the region where the flow leveler is located.

[0006] Preferably, the number of the advection blocks is at least two, and the two advection blocks can be directly adjacent to each other or separated by a diversion block.

[0007] Preferably, the number of the flow divider is at least one, and the number of the flow leveler is multiple. After the molten raw material is split into left and right by the flow divider, it reaches the secondary flow cavity from the area where the flow leveler is located.

[0008] Preferably, the number of the diversion blocks is at least two, and the two diversion blocks can be directly adjacent to each other. The mechanical seal between the directly adjacent diversion blocks is achieved through the tight assembly between the diversion blocks. The two diversion blocks can also be separated by a flow divider.

[0009] Preferably, the upper mold body and the lower mold body are connected by fastening screws. The fastening screws pass through the washer from top to bottom in the upper mold body and are connected to the threaded hole in the lower mold body, or the fastening screws pass through the washer from bottom to top in the lower mold body and are connected to the threaded hole in the upper mold body.

[0010] This invention incorporates a flow divider block on the basis of the original single-flow cavity to guide the raw material entering the mold body to change its flow direction. This effectively avoids the retention of raw material at both ends of the mold cavity and effectively improves the uniformity of material flow distribution, resulting in a more uniform product thickness. Attached Figure Description

[0011] Figure 1 This is an exploded structural diagram of the present invention;

[0012] Figure 2 This is a schematic diagram of one possible structure for connecting the flow divider block to the lower mold body in this invention;

[0013] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0014] Figure 4 This is a schematic diagram of the internal structure of the lower mold body in this invention;

[0015] Wherein: 1—Upper mold body; 2—Lower mold body; 3—Gap piece; 4—Cavity; 41—Primary flow cavity; 42—Secondary flow cavity; 5—Feed channel; 6—Mounting cavity; 7—Positioning screw; 8—Flow leveling block; 9—Flow divider block; 10—Fastening screw. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings.

[0017] like Figures 1 to 4 As shown, the present invention provides a variable dual-cavity coating die head, including an upper die body 1 and a lower die body 2. A gasket 3 is provided between the upper die body 1 and the lower die body 2. A recessed cavity 4 is provided on the top surface of the lower die body 2 along the width direction. A feeding channel 5 communicating with the rear of the cavity 4 is provided in the middle of the rear side of the lower die body 2. A series of mounting cavities 6 are provided at equal intervals along the width direction on the bottom surface of the middle part of the cavity 4. A flow block 8 or a flow divider is connected to the bottom of each mounting cavity 6 by a positioning screw 7. Block 9, the top surface of the flow block 8 is adapted to the bottom surface of the cavity 4. After the top surface of the flow divider block 9 extends out of the cavity 4, its top surface height is flush with the top surface of the lower mold body 2. The flow divider block 9 divides the cavity 4 into front and rear areas. The cavity 4 on the rear side of the flow divider block 9 forms a primary flow cavity 41, and the cavity 4 on the front side of the flow divider block 9 forms a secondary flow cavity 42. The molten raw material reaches the primary flow cavity 41 after passing through the feed channel 5, and enters the secondary flow cavity 42 after being divided by the left and right sides of the flow divider block 9, and is finally extruded from the front mold lip.

[0018] Based on the above scheme, there are multiple diversion blocks 9 and at least one horizontal flow block 8. After the molten raw material is diverted to the left and right by the diversion blocks 9, it reaches the secondary flow cavity 42 from the area where the horizontal flow block 8 is located.

[0019] The number of the advection blocks 8 is at least two. The two advection blocks 8 can be directly adjacent to each other or separated by the diversion blocks 9.

[0020] In addition, there is at least one diverting block 9 and multiple horizontal flow blocks 8. After being diverted to the left and right by the diverting block 9, the molten raw material reaches the secondary flow cavity 42 from the area where the horizontal flow block 8 is located.

[0021] In addition, the number of the diversion blocks 9 is at least two. The two diversion blocks 9 can be directly adjacent to each other. The mechanical seal between the directly adjacent diversion blocks 9 is achieved through the tight assembly between the diversion blocks 9. The two diversion blocks 9 can also be separated by the flow block 8.

[0022] Furthermore, the upper mold body 1 and the lower mold body 2 are connected by fastening screws 10. The fastening screws 10 pass through the washer 3 from top to bottom in the upper mold body 2 and are connected to the threaded hole in the lower mold body 2, or the fastening screws 10 pass through the washer 3 from bottom to top in the lower mold body 2 and are connected to the threaded hole in the upper mold body 1.

[0023] The number and position of the flow dividers 9 connected to the lower mold body 2 are set according to actual needs, and their combination methods are diverse. After the molten raw material enters the primary flow cavity 41 through the feed channel 5, it fills the primary flow cavity 41. After being blocked by the flow dividers 9, it is diverted to both sides to change the flow direction and flow rate, which can effectively change the phenomenon of raw material accumulation at both ends of the cavity 4. After the adjusted molten raw material enters the secondary flow cavity 42, it can flow from the front mold lip gap at a relatively uniform speed in different width ranges, so that the thickness of the product is more uniform.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, equivalent changes, or alterations made to the above embodiments based on the technical principles of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A variable dual-cavity coating die head, comprising an upper die body (1) and a lower die body (2), wherein a gasket (3) is disposed between the upper die body (1) and the lower die body (2), characterized in that: The lower mold body (2) has a recessed cavity (4) on its top surface along the width direction. The lower mold body (2) has a feeding channel (5) in the middle of its rear side that communicates with the rear of the cavity (4). The bottom surface of the middle part of the cavity (4) has a series of mounting cavities (6) at equal intervals along the width direction. Each mounting cavity (6) has a flow block (8) or a flow divider (9) connected to its bottom by a positioning screw (7). The top surface of the flow block (8) is matched with the bottom surface of the cavity (4). The top surface of the flow divider (9) extends out of the cavity (4) and its height is flush with the top surface of the lower mold body (2). The cavity (4) is divided into two regions, front and back. The cavity (4) behind the flow divider (9) forms a primary flow cavity (41), and the cavity (4) in front of the flow divider (9) forms a secondary flow cavity (42). The molten material reaches the primary flow cavity (41) after passing through the feed channel (5), and enters the secondary flow cavity (42) after being divided by the left and right sides of the flow divider (9), and is finally extruded from the front die lip. There are multiple flow dividers (9), and at least one horizontal flow block (8). The molten material reaches the secondary flow cavity (42) from the region where the horizontal flow block (8) is located after being divided by the left and right sides of the flow divider (9).

2. The variable dual-cavity coating die head according to claim 1, characterized in that: The number of the advection blocks (8) is at least two. The two advection blocks (8) can be directly adjacent to each other or separated by a diversion block (9).

3. The variable dual-cavity coating die head according to claim 1, characterized in that: The number of the diverting block (9) is at least one, and the number of the horizontal block (8) is multiple. After the molten raw material is diverted to the left and right by the diverting block (9), it reaches the secondary flow cavity (42) from the area where the horizontal block (8) is located.

4. A variable dual-cavity coating die head according to claim 3, characterized in that: The number of the diversion blocks (9) is at least two. The two diversion blocks (9) can be directly adjacent to each other. The mechanical seal between the directly adjacent diversion blocks (9) is achieved through the tight assembly between the diversion blocks (9). The two diversion blocks (9) can also be separated by a flow block (8).

5. A variable dual-cavity coating die head according to claim 1, characterized in that: The upper mold body (1) and the lower mold body (2) are connected by fastening screws (10). The fastening screws (10) pass through the gasket (3) from top to bottom in the upper mold body (1) and are connected to the threaded hole in the lower mold body (2). Alternatively, the fastening screws (10) pass through the gasket (3) from bottom to top in the lower mold body (2) and are connected to the threaded hole in the upper mold body (1).

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