An applicator for curtain coating with a double-sided slope flow

Abstract

The utility model discloses a kind of applicators of double-sided slope flow curtain coating, its die head includes a plane die lip and several curved die lip, curved die lip is sequentially provided with feed inlet and uniform material cavity from below to above, a plane die lip and several curved die lip are sequentially adhered to form slit from above to below, glue coating is added by feed inlet and flows along uniform material cavity and slit, a plane die lip and several curved die lip are inclined to be set to make glue coating obliquely flow, a plane die lip and several curved die lip are set as the flow inclined wall of ladder shape at slit outlet, glue coating is formed several layers of material film by ladder shape of flow inclined wall after flowing out from respective slit, material film freely falls and is adhered to left coating roller and right coating roller surface.The utility model can directly carry out the both sides coating of paper web, improve coating efficiency;Die head can realize that multiple material films cover sequentially and adhere to the coating roller surface plane and coat, efficiently realize the process of multiple coating.

Description

Technical Field

[0001] This utility model relates to the field of mechanical technology of papermaking machines and coating machines, and more specifically to a coating applicator for double-sided slope curtain coating. Background Technology

[0002] Traditional metering rod film transfer applicators are crucial components of papermaking and coating machines. During use, the metering rod measures the coating amount by the size of the grooves on its surface. To accurately control the coating quantity, multiple metering rods of various sizes are required for replacement. Furthermore, metering rods become worn down and lose functionality, eventually becoming unusable. Metering rods are expensive, considered consumable parts, and frequent replacements and scrapping lead to high operating costs. Metering rod film transfer applicators can only perform single-sided coating. Therefore, in scenarios requiring double-sided coating, two sets of metering rod film transfer applicators are needed to coat both sides of the paper web, increasing the cost and complexity of equipment layout. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a double-sided slope curtain coating applicator to improve coating efficiency and meet the needs of multi-layer coating.

[0004] This utility model provides the following technical solution: a coating device for double-sided slope curtain coating, comprising a left coating roller and a right coating roller that can be brought close together or separated. When the left and right coating rollers are brought close together, they form a coating roller pressure zone. The paper web passes through the coating roller pressure zone and is conveyed as the left and right coating rollers rotate. A die head is provided above both the left and right coating rollers. The die head includes a flat die lip and several curved die lips. The curved die lips, from bottom to top, are provided with a feed inlet and a uniform feeding chamber. The flat die lip and several curved die lips are sequentially bonded together from top to bottom to form a slit. The adhesive coating is added through the feed port and flows along the uniform material chamber and the slit. A flat die lip and several curved die lips are inclined so that the adhesive coating flows obliquely upward. A flat die lip and several curved die lips are set as a stepped flow slope at the slit outlet. After the adhesive coating flows out from its respective slit, it forms several layers of material film by relying on the stepped flow slope. After the material film falls freely, it is applied to the surface of the left coating roller and the right coating roller.

[0005] As an improvement, the curved die lips are set to 2-4, which allows for the delivery of corresponding amounts of different adhesive coatings to form the required number of film layers.

[0006] As an improvement, the material leveling cavity includes a primary material leveling cavity and a secondary material leveling cavity. The inlet, the primary material leveling cavity, the secondary material leveling cavity and the slit are arranged in sequence. The primary material leveling cavity extends into the curved die lip, and the secondary material leveling cavity extends obliquely to the upper surface of the curved die lip.

[0007] As an improvement, a flip plate is provided on the flat die lip. The flip plate flips over and covers the outside of the flow ramp, thereby preventing impurities or wind from affecting the flow of the film on the flow ramp.

[0008] As an improvement, the die head is movably mounted on the die head frame. The die head can be adjusted to either the working position or the material preparation position. The working position is directly above the left or right coating roller, while the material preparation position is located to the side and above the left or right coating roller.

[0009] As an improvement, a receiving hopper is provided at the material preparation location to catch and recycle excess adhesive coating below the die head.

[0010] As an improvement, it also includes an applicator frame, on which a hydraulic cylinder and an applicator rotating arm are mounted. The hydraulic cylinder is connected to the applicator rotating arm and drives the applicator rotating arm to swing during operation. One of the left and right applicator rollers is rotatably mounted on the applicator frame, and the other is rotatably mounted on the applicator rotating arm. Thus, the operation of the hydraulic cylinder causes the left and right applicator rollers to move closer or separate.

[0011] As an improvement, it also includes an air deflector, which is connected to a fan. The air deflector is located on the output side of the left and right coating rolls. The air deflector blows out air to form an air cushion to receive and transport the paper web.

[0012] As an improvement, it also includes guide rollers, which are arranged on the input side of the left and right coating rollers for supporting the wrapping of the paper web.

[0013] The beneficial effects of this utility model are as follows: By using left and right coating rollers in conjunction with left and right dies, coating can be performed directly on both sides of the paper web, improving coating efficiency; and the film is formed directly through the slit of the die, resulting in high film precision, avoiding the consumption and wear of the original vulnerable parts, and reducing costs; the die, through the design of multiple channels and flow slopes at different heights, allows multiple layers of film to be sequentially covered and adhered to the surface of the coating rollers for coating, efficiently realizing the multi-layer coating process. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the coating device of this utility model, which is configured to run downwards on the paper web.

[0015] Figure 2 This is a schematic diagram of the coating device of this utility model, which is configured to run upward on the paper web.

[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of the mold head of this utility model.

[0017] In the diagram: 1. Paper web (arrows indicate the direction of paper web movement); 2. Guide roller; 3. Coating arm; 4. Left coating roller; 5. Receiving hopper; 6. Material preparation position (position of the die head); 7. Working position (position of the die head); 8. Air deflector; 9. Right coating roller; 10. Coating frame; 11. Hydraulic cylinder; 12. Die head frame; 13. Coating roller pressure zone; 71. Curved die lip; 72. Flat die lip; 73. Flow inclined wall; 74. Feed inlet; 75. Primary uniform distribution chamber; 76. Secondary uniform distribution chamber; 77. Slit; 78. Material film; 79. Tilting plate. Detailed Implementation

[0018] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0019] Please refer to the attached diagram. The diagram only schematically illustrates the positional relationships of the various components and is used solely to explain the working principle of the applicator. It does not depict all the parts used in actual applications and is not proportional to the actual product. The arrows in the diagram indicate the direction of paper web movement.

[0020] like Figure 1 , 2 Figure 3 shows a specific embodiment of the coating device for double-sided slope curtain coating of this utility model. This embodiment includes a left coating roller 4 and a right coating roller 9 that can be brought together or separated. When the left and right coating rollers 4 and 9 are brought together, they form a coating roller pressing zone 13. The paper web passes through the coating roller pressing zone 13 and is conveyed as the left and right coating rollers 4 and 9 rotate. A die head is provided above both the left and right coating rollers 4 and 9. The die head includes a flat die lip 72 and several curved die lips 71. The curved die lips 71 are provided with a feed inlet 74 and a uniform material chamber from bottom to top. The flat die lip 72 and the several curved die lips 71 are arranged from top to bottom... The adhesive coating is sequentially bonded to form a slit 77. The adhesive coating is added through the feed port 74 and flows along the uniform material chamber and the slit 77. A flat die lip 72 and several curved die lips 71 are inclined to make the adhesive coating flow obliquely upward. The flat die lip 72 and several curved die lips 71 are set as a stepped flow inclined wall 73 at the outlet of the slit 77. After the adhesive coating flows out from its respective slit 77, it forms several layers of material film 78 by relying on the stepped shape of the flow inclined wall 73. After the material film 78 falls freely, it is applied to the surface of the left coating roller 4 and the right coating roller 9.

[0021] In use, the left coating roller 4 and the right coating roller 9 rotate at a predetermined speed, and can approach and separate. When they approach, a coating roller pressing area 13 is formed, which coats the paper web 1 passing through the pressing area. When they separate, a certain space is formed between the two rollers to facilitate paper feeding and daily maintenance. The coating roller pressing area 13 is a certain length of bonding area formed by the left coating roller 4 and the right coating roller 9 pressing together after they approach. When the left coating roller 4 and the right coating roller 9 separate, the coating roller pressing area 13 immediately disappears. The die head is formed by a planar die lip 72 and several curved die lips 71 arranged in sequence. The planar die lip 72 and several curved die lips 71 are tightly bonded together to form a slit 77. After being measured through the slit 77, the material film 78 flows out. Liquid adhesive is conveyed from the feeding equipment to the inlet 74. The adhesive enters the die head through the inlet 74, and after being processed by the uniform material chamber, it flows out through the slit 77. The flowing liquid is precisely measured by the slit 77 to form a uniform film 78. The film 78 flowing out from multiple slits 77 continues to flow downward along the flow inclined wall 73. Because the flow inclined wall 73 is arranged in a stepped manner, the film 78 of the upper layer will cover the surface of the lower layer after flowing to the position of the lower layer, forming a multi-layer structure and continuing to fall. After detaching from the flow inclined wall 73, the multi-layer structure of film 78 falls freely and adheres to the rubber surface of the left coating roller 4 and the right coating roller 9. It is then transferred to the front and back sides of the paper web 1 through the coating roller pressure zone 13, thus completing the coating work. The die head of this invention delivers material precisely through multiple channels, forming a multi-layer film structure 78 that does not mix, ensuring that the multi-layer coatings do not affect each other and guaranteeing that the functionality of different coatings is not compromised, thereby achieving efficient multi-layer coating.

[0022] As an improved specific implementation, the curved die lip 71 is set to 2-4, thereby allowing the corresponding number of different adhesive coatings to be conveyed to form the required number of layers of film 78.

[0023] like Figure 3 As shown, depending on the required number of coating layers, 2-4 curved die lips 71 can be set as needed, thereby forming 2-4 flow channels to transport the adhesive coating and form the required number of film layers 78, achieving multi-layer coating in a single operation. In practical use, the die head with multiple curved die lips 71 can also control the number of flow channels. For example, a die head with 4 flow channels can selectively use only 2-3 flow channels to meet the required number of coating layers.

[0024] As an improved specific implementation, the material leveling cavity includes a primary material leveling cavity 75 and a secondary material leveling cavity 76. The feed inlet 74, the primary material leveling cavity 75, the secondary material leveling cavity 76 and the slit 77 are arranged in sequence. The primary material leveling cavity 75 extends in the curved die lip 71 and the secondary material leveling cavity 76 extends obliquely through to the upper surface of the curved die lip 71.

[0025] like Figure 3 As shown, the further refined structure sets the material uniform chamber into a primary material uniform chamber 75 and a secondary material uniform chamber 76. The primary material uniform chamber 75 is connected to the feed inlet 74 and the secondary material uniform chamber 76. The adhesive coating flows along the material uniform chamber to achieve stability. The secondary material uniform chamber 76 is more inclined than the primary material uniform chamber 75, thereby allowing the adhesive coating to reach the slit 77 and ensuring the overall stable output of the adhesive coating. When flowing outward, the thickness is uniform and consistent, forming a high-quality material film 78, ensuring the coating quality.

[0026] As an improved specific implementation, a flip plate 79 is provided on the flat die lip 72. The flip plate 79 flips over and covers the outside of the flow inclined wall 73 to avoid impurities or wind affecting the flow of the material film 78 on the flow inclined wall 73.

[0027] like Figure 3 As shown, the flip plate 79 can be flipped using conventional structures such as hinges. In the working state, the flip plate 79 is kept on the outside of the flow slope 73 to cover it, so that external impurities or wind will not affect the uniform and orderly downward flow of the material film 78 on the flow slope 73, ensuring the coating quality. When the die head needs maintenance, the flip plate 79 can be flipped up to expose the flow slope 73, making it convenient for staff to clean and maintain.

[0028] As an improved specific implementation, the die head is movably mounted on the die head frame 12. The die head is adjusted to the working position 7 or the material preparation position 6. The working position 7 is directly above the left coating roller 4 or the right coating roller 9, and the material preparation position 6 is located to the side and above the left coating roller 4 or the right coating roller 9.

[0029] like Figure 1 , 2 As shown, the die head frame 12 is used for mounting the die head. The die head is configured to be movable according to the production process requirements, and corresponding working position 7 and material preparation position 6 are provided. The die head frame 12 can be equipped with a track and supplemented by a power mechanism such as a motor or cylinder, and a chain or gear transmission group for power transmission, thereby realizing the horizontal or vertical movement of the die head. When the die head is in the working position 7, normal coating work is performed; when the die head is in the material preparation position 6, material changing work and maintenance work of the coating roller are performed.

[0030] As an improved specific implementation, the material preparation position 6 is provided with a receiving hopper 5, which catches and recovers excess adhesive coating below the die head.

[0031] like Figure 1 , 2 As shown, at the material preparation position 6, continuous feeding is still required to prevent the slit 77 of the die head from being blocked. Therefore, a receiving hopper 6 is further set up to catch and recycle the adhesive coating, thus avoiding waste of raw materials.

[0032] As an improved specific implementation, it also includes an applicator frame 10, on which a hydraulic cylinder 11 and an applicator rotating arm 3 are provided. The hydraulic cylinder 11 is connected to the applicator rotating arm 3 and drives the applicator rotating arm 3 to swing during operation. One of the left applicator roller 4 and the right applicator roller 9 is rotatably mounted on the applicator frame 10, and the other is rotatably mounted on the applicator rotating arm 3. Thus, the operation of the hydraulic cylinder 11 causes the left applicator roller 4 and the right applicator roller 9 to move closer or separate.

[0033] like Figure 1 , 2 As shown, the coater frame 10 is used to install either the left coating roller 4 or the right coating roller 9, and the coater rotating arm 3 is used to install the other right coating roller 9 or the left coating roller 4. The coater rotating arm 3 is powered by the hydraulic cylinder 11 and rotates clockwise or counterclockwise. Rotating at a certain angle causes the left coating roller 4 and the right coating roller 9 to approach and separate. When they approach, a coating roller pressure zone 13 is formed, which applies coating to the paper web 1 passing through the pressure zone. When they separate, a certain gap is formed between the two rollers to facilitate paper feeding and daily maintenance.

[0034] As an improved specific implementation, it also includes an air deflector 8, which is connected to a fan. The air deflector 8 is arranged on the output side of the left coating roller 4 and the right coating roller 9. The air deflector 8 blows out air to form an air cushion to receive and transport the paper web.

[0035] like Figure 1 , 2 As shown, the air diverter 8 is installed at the die head frame 12. The air diverter 8 is connected to a blower. During use, the blower draws in air and forces it into the air diverter 8. The blown air exits through slots or holes on the arc-shaped surface of the air diverter 8, forming an air cushion that supports the paper web 1 exiting the coating roll pressing area 13. The paper web surface after coating from the coating roll pressing area 13 carries a moist film 78; the air cushion supports it, preventing damage to the film 78. The motor of the air diverter 8 blower is frequency-controlled, allowing adjustment of airflow and pressure according to production process requirements, ultimately controlling the tension of the paper web 1.

[0036] As an improved specific implementation, it also includes a guide roller 2, which is arranged on the input side of the left coating roller 4 and the right coating roller 9 for supporting the wrapping of the paper web.

[0037] like Figure 1 , 2 As shown, the guide roller 2 is installed at the die head frame 12. When the guide roller 2 is working, it rotates to support the paper web and allows it to smoothly enter the coating roller pressure area 13 between the left coating roller 4 and the right coating roller 9.

[0038] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A coating device for double-sided slope curtain coating, comprising a left coating roller (4) and a right coating roller (9) that can be brought close together or separated, wherein the left coating roller (4) and the right coating roller (9) form a coating roller pressure zone (13) after being brought close together, and the paper web passes through the coating roller pressure zone (13) and is conveyed when the left coating roller (4) and the right coating roller (9) rotate, wherein a die head is provided above both the left coating roller (4) and the right coating roller (9), characterized in that: The die head includes a flat die lip (72) and several curved die lips (71). The curved die lips (71) are provided with a feed inlet (74) and a uniform material cavity from bottom to top. The flat die lip (72) and several curved die lips (71) are attached from top to bottom to form a slit (77). The adhesive coating is added through the feed inlet (74) and flows along the uniform material cavity and the slit (77). The flat die lip (72) and several curved die lips (71) are inclined so that the adhesive coating flows obliquely upward. The flat die lip (72) and several curved die lips (71) are set as a stepped flow slope wall (73) at the outlet of the slit (77). After the adhesive coating flows out from its respective slit (77), it forms several layers of material film (78) by relying on the stepped shape of the flow slope wall (73). After the material film (78) falls freely, it is attached to the surface of the left coating roller (4) and the right coating roller (9).

2. The applicator for double-sided slope flow curtain coating according to claim 1, characterized in that: The curved die lip (71) is configured in 2-4 parts, which are used to transport the corresponding number of different adhesive coatings to form the required number of film layers (78).

3. The applicator for double-sided slope flow curtain coating according to claim 1, characterized in that: The material leveling chamber includes a primary material leveling chamber (75) and a secondary material leveling chamber (76). The feed inlet (74), the primary material leveling chamber (75), the secondary material leveling chamber (76), and the slit (77) are arranged in sequence. The primary material leveling chamber (75) extends into the curved die lip (71), and the secondary material leveling chamber (76) extends obliquely to the upper surface of the curved die lip (71).

4. The applicator for double-sided slope flow curtain coating according to claim 1, 2, or 3, characterized in that: A flip plate (79) is provided on the planar die lip (72). The flip plate (79) flips over to cover the outside of the flow inclined wall (73) to avoid impurities or wind affecting the flow of the film (78) on the flow inclined wall (73).

5. The applicator for double-sided slope flow curtain coating according to claim 1, 2, or 3, characterized in that: The die head is movably mounted on the die head frame (12). The die head is adjusted to the working position (7) or the material preparation position (6). The working position (7) is directly above the left coating roller (4) or the right coating roller (9). The material preparation position (6) is located above the left coating roller (4) or the right coating roller (9).

6. The applicator for double-sided slope flow curtain coating according to claim 5, characterized in that: The material preparation position (6) is equipped with a receiving hopper (5) to catch and recycle excess adhesive coating below the die head.

7. The applicator for double-sided slope flow curtain coating according to claim 1, 2, or 3, characterized in that: It also includes an applicator frame (10), on which a hydraulic cylinder (11) and an applicator rotating arm (3) are provided. The hydraulic cylinder (11) is connected to the applicator rotating arm (3) and drives the applicator rotating arm (3) to swing during operation. One of the left applicator roller (4) and the right applicator roller (9) is rotatably mounted on the applicator frame (10), and the other is rotatably mounted on the applicator rotating arm (3). The operation of the hydraulic cylinder (11) causes the left applicator roller (4) and the right applicator roller (9) to move closer or separate.

8. The applicator for double-sided slope flow curtain coating according to claim 1, 2, or 3, characterized in that: It also includes an air deflector (8), which is connected to a fan. The air deflector (8) is arranged on the output side of the left coating roller (4) and the right coating roller (9). The air deflector (8) blows out air to form an air cushion to receive and transport the paper web.

9. The applicator for double-sided slope flow curtain coating according to claim 8, characterized in that: It also includes a guide roller (2), which is arranged on the input side of the left coating roller (4) and the right coating roller (9) for supporting the wrapping of the paper web.

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