An applicator roller with a doctor blade structure

Abstract

The utility model relates to PE film processing technical field, concretely is a kind of scraper structure of coating roller.The utility model includes the material scraping part for scraping the excess glue solution of coating roller periphery, material scraping part includes the extrusion arc plate of the arc center with coating roller coaxial arrangement, and extrusion arc plate and coating roller between there is extrusion channel for compressing glue solution, the plate edge on extrusion arc plate on the inlet and outlet of extrusion channel respectively has the guide plate of outwardly inclined expansion and the material scraping plate of inwardly inclined contraction, to make that guide plate and coating roller between and material scraping plate and coating roller between respectively form the guide area and material scraping area that gradually close mouth along glue solution delivery direction.This utility model further optimizes scraper structure, effectively reduces the passing rate of bubble at scraper structure, significantly improves the oxygen barrier property of coating formed by coating.

Description

Technical Field

[0001] This utility model relates to the field of PE film processing technology, specifically a scraper structure for a coating roller. Background Technology

[0002] Coating is a process that involves uniformly applying liquid adhesives to the surface of a substrate. It is widely used in industries such as packaging, electronics, medical, and building materials.

[0003] Most coating structures include a coating roller and an adhesive tank located directly below the coating roller. The lower outer periphery of the coating roller is located within the inner cavity of the adhesive tank. The coating roller continuously rotates to pick up adhesive and apply it to the substrate. The scraper is a key component in the coating process, used to scrape off excess adhesive from the outer surface of the roller to control the thickness and uniformity of the coated layer. Most existing scraper structures, such as those described in Chinese Patent Publication No. CN107159510A entitled "Scraper, Coating Apparatus, and Method for Manufacturing a Laminated Partition Plate," have a straight plate-shaped structure with its length parallel to the axial direction of the coating roller. One side of the scraper is arranged adjacent to the outer periphery of the coating roller to scrape off excess adhesive.

[0004] In the coating process, the process of the coating roller picking up adhesive from the adhesive tank and the pumping replenishment of the adhesive tank inevitably cause adhesive flow. This flow is particularly prone to generating air bubbles for low-concentration water-soluble adhesives. The scraper structure described in the cited patent employs a design where one side is adjacent to the outer periphery of the coating roller. In actual operation, when the scraper performs the adhesive scraping operation, it rapidly contacts and separates from the adhesive on the outer periphery of the coating roller. This dynamic process causes some air bubbles to pass through the scraper gap along with the adhesive and ultimately be coated onto the substrate surface. These residual air bubbles significantly reduce the density of the coating, thus severely affecting its oxygen barrier properties, and therefore urgently need to be addressed. Utility Model Content

[0005] In order to avoid and overcome the technical problems existing in the prior art, this utility model provides a scraper structure for a coating roller, which further optimizes the scraper structure, effectively reduces the passage rate of air bubbles at the scraper structure, and significantly improves the oxygen barrier performance of the coating formed by coating.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A scraper structure for a coating roller includes a scraping section for scraping off excess adhesive from the outer periphery of the coating roller. The scraping section includes an extrusion arc plate with its arc center coaxially arranged with the coating roller. An extrusion channel for compressing the adhesive is provided between the extrusion arc plate and the coating roller. The extrusion arc plate has an outwardly expanding guide plate and an inwardly contracting scraper plate on its edges at the entrance and exit of the extrusion channel, respectively, so that a guide zone and a scraping zone that gradually narrow along the adhesive conveying direction are formed between the guide plate and the coating roller, and between the scraper plate and the coating roller, respectively.

[0008] As a further embodiment of this utility model: the scraper plate is rotatably fitted on the extrusion arc plate via a hinge shaft parallel to the coating roller, and the scraper part also includes an adjustment component for adjusting the rotation angle of the scraper plate.

[0009] As a further embodiment of this utility model: the adjustment component includes a screw hinged to the outside of the scraper plate via a floating joint, a screw sleeve screwed to the outside of the screw, and the screw sleeve rotatingly fitting on a bracket on the outside of the extrusion arc plate.

[0010] As a further embodiment of this utility model: the adjustment component includes a worm gear coaxially fixed to the outer end of the scraper hinge shaft, and a worm gear meshing with the worm gear is rotatably fitted on the bracket on the outer side of the extrusion arc plate.

[0011] As a further embodiment of this utility model: the plate body of the extrusion arc plate is located at the outlet of the extrusion channel as an outwardly expanding arc neck, and the scraper plate is installed on the outer edge of the arc neck.

[0012] As a further improvement of this utility model: the lower part of the scraping part is equipped with a return trough for receiving the scraped adhesive, and the lower outlet of the return trough points towards the adhesive tank.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. Before being conveyed to the coating area, the adhesive solution passes sequentially through a gradually narrowing guide zone, an extrusion channel, a gradually narrowing scraper zone, and the outer edge of the scraper plate. The gradually narrowing guide zone formed by the guide plate and the coating roller initially breaks up air bubbles in the adhesive solution. Subsequently, the extrusion channel between the extrusion arc plate and the roller further compresses the adhesive solution, forcing air bubbles to burst or be expelled. Finally, the gradually narrowing structure of the scraper zone and the edge of the scraper plate are used to scrape off excess adhesive solution and remove residual air bubbles, forming a layered, progressively compressed and broken air bubble structure. This effectively reduces the air bubble content of the adhesive solution conveyed to the coating area and enhances the oxygen barrier properties of the coating formed.

[0015] 2. The scraper is connected to the adjustment component via a hinge shaft. The thickness of the adhesive can be controlled simply by adjusting the angle of the scraper. There is no need to move the scraper as a whole, which avoids disrupting the uniformity of the extrusion channel and ensures a stable bubble-removal effect.

[0016] 3. The adjustment component adopts a screw and sleeve matching adjustment structure or a worm gear matching adjustment structure, which is easy to operate and has a self-locking function. After adjustment, it is reliably fixed to prevent the scraper from shifting.

[0017] 4. An outwardly expanding arc neck is provided at the outlet of the extrusion channel to temporarily release the pressure of the adhesive at the outlet of the extrusion channel, thereby reducing the amount of overflow from the hinge shaft of the scraper plate.

[0018] 5. The return tank receives the scraped adhesive and guides it back to the adhesive tank, realizing the recycling of adhesive, reducing waste, and saving production costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the distribution structure of the present invention and the coating roller.

[0020] Figure 2 This is a schematic diagram showing the distribution structure of the scraping section and the coating roller in this utility model.

[0021] Figure 3 This is a schematic diagram of the connection structure between the scraper and the extrusion arc plate in this utility model.

[0022] In the diagram: 10, scraper section; 11, guide plate; 12, extrusion arc plate; 121, arc neck; 13, scraper plate; 14, adjusting assembly; 141, floating joint; 142, screw; 143, screw sleeve; 20, return trough; a, coating roller; b, adhesive tank. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] For ease of understanding, the specific structure and working method of this utility model are further described below with reference to the accompanying drawings:

[0025] The specific structure of this utility model is as follows: Figure 1-3As shown, its main structure includes a scraping section 10 for scraping off excess adhesive from the outer periphery of the coating roller a. The scraping section 10 includes a compression arc plate 12 coaxially arranged with the center of the arc and the coating roller a. A compression channel for compressing the adhesive is formed between the compression arc plate 12 and the coating roller a. The compression arc plate 12 has an outwardly expanding guide plate 11 and an inwardly contracting scraping plate 13 on its edges at the inlet and outlet of the compression channel, respectively. This creates a gradually narrowing guide zone and a scraping zone along the adhesive conveying direction between the guide plate 11 and the coating roller a, and between the scraping plate 13 and the coating roller a, respectively. Figure 1 As shown, in the prior art, the coating roller a is often arranged horizontally, with the coating area of ​​the coating roller a located at its upper part and the lower part of the coating roller a located in the adhesive tank b. When the coating roller a rotates, it can pick up the adhesive from the adhesive tank b and apply it to the coating area. The scraper part 10 in this application is precisely arranged on the conveying path of the adhesive picked up by the coating roller a to the coating area, for scraping off excess adhesive. In use, the adhesive picked up by the outer periphery of the coating roller a first contacts the guide plate 11. The guide plate 11, which gradually narrows along the adhesive conveying direction between the coating roller a and the guide plate 11, guides the adhesive into the inlet of the extrusion channel. In actual implementation, some air bubbles in the adhesive are broken in the gradually narrowing structure of the guide plate. Subsequently, the adhesive is compressed within the extrusion channel formed between the extrusion arc plate 12 and the coating roller a, thereby further squeezing out or expelling the air bubbles in the adhesive. Finally, the adhesive is expelled from the air bubbles by the extrusion channel and then conveyed towards the scraper plate 13. The outer edge of the scraper plate 13 scrapes away excess adhesive and breaks any remaining air bubbles during the scraping process. In actual implementation, a scraping zone that gradually narrows along the adhesive conveying direction is formed between the scraper plate 13 and the coating roller a, further extruding and breaking air bubbles before the adhesive is scraped away. This application achieves the compression and breaking of air bubbles in the adhesive through sequential layering via the guide zone, extrusion channel, scraping zone, and the outer edge of the scraper plate 13, effectively increasing the air bubble content in the adhesive delivered to the coating zone and significantly improving the oxygen barrier properties of the resulting coating.

[0026] Based on the above, such as Figure 3 As shown, the scraper plate 13 is rotatably mounted on the extrusion arc plate 12 via a hinge shaft parallel to the coating roller a, and the scraper section 10 also includes an adjustment assembly 14 for adjusting the rotation angle of the scraper plate 13. By adjusting the rotation angle of the scraper plate 13, different coating thicknesses can be controlled without moving the entire scraper section 10. Therefore, the uniformity of the extrusion channel formed between the extrusion arc plate 12 and the coating roller a is not changed.

[0027] Specifically, such as Figure 3As shown, the adjusting assembly 14 includes a screw 142 hinged to the outside of the scraper plate 13 via a floating joint 141. A threaded sleeve 143 is screwed onto the outside of the screw 142, and the threaded sleeve 143 is rotatably fitted onto a bracket on the outside of the extrusion arc plate 12. By rotating the threaded sleeve 143, the screw 142 slides axially. The floating joint 141 allows the sliding of the screw 142 to drive the scraper plate 13 to rotate, and the threaded connection between the threaded sleeve 143 and the screw 142 also achieves a good locking effect. Of course, to further enhance the locking between the threaded sleeve 143 and the screw 142, a set screw with radial threads on the threaded sleeve 143 that abuts against the screw 142 can be used. Furthermore, the aforementioned floating joint 141 is a commonly used structure in the prior art, specifically a joint rod with both ends hinged to the screw 142 and the scraper plate 13 respectively, and the hinge axes at both ends of the joint rod are parallel to the hinge axis of the scraper plate 13.

[0028] In actual implementation, the adjusting assembly 14 also has other embodiments (not shown in the accompanying drawings), specifically: the adjusting assembly 14 includes a worm gear coaxially fixed to the outer end of the hinge shaft of the scraper plate 13, and a worm gear rotatably engaged with the worm gear on the bracket outside the extrusion arc plate 12. In use, the worm gear's rotation and engagement with the worm gear drive the scraper plate 13 to rotate, and the worm gear's one-way locking of the worm gear achieves locking and fixing of the scraper plate 13 after rotation adjustment.

[0029] Based on the above, as shown in Figure 3, in this application, the plate body of the extrusion arc plate 12 is located at the outlet of the extrusion channel as an outwardly expanding arc neck 121, and the scraper plate 13 is installed on the outer edge of the arc neck 121. The structure of this arc neck 121 forms an expansion section at the outlet of the extrusion channel, which causes the pressure of the adhesive to be temporarily reduced at the outlet of the extrusion channel, effectively reducing the amount of adhesive overflowing from the hinge shaft of the scraper plate 13.

[0030] Based on the above, such as Figure 1 As shown, a return tank 20 for receiving scraped adhesive is installed at the lower part of the scraping section 10. The lower outlet of the return tank 20 points to the adhesive tank b, which can recycle the scraped adhesive and reduce the waste of adhesive.

[0031] Of course, those skilled in the art will recognize that this invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0033] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A doctor blade structure for a coating roll, characterized in that The coating includes a scraper section (10) for scraping off excess adhesive from the outer periphery of the coating roller (a). The scraper section (10) includes an extrusion arc plate (12) with the arc center coaxially arranged with the coating roller (a). There is an extrusion channel for compressing the adhesive between the extrusion arc plate (12) and the coating roller (a). The extrusion arc plate (12) has an outwardly expanding guide plate (11) and an inwardly contracting scraper plate (13) on the plate edge located at the entrance and exit of the extrusion channel, respectively, so that a guide area and a scraper area that gradually narrow along the adhesive conveying direction are formed between the guide plate (11) and the coating roller (a) and between the scraper plate (13) and the coating roller (a), respectively.

2. A doctor blade structure for a coating roll according to claim 1, wherein The scraper (13) is rotated on the extrusion arc plate (12) via a hinge shaft parallel to the coating roller (a), and the scraper part (10) also includes an adjustment component (14) for adjusting the rotation angle of the scraper (13).

3. The scraper structure of a coating roller according to claim 2, characterized in that, The adjustment assembly (14) includes a screw (142) hinged to the outside of the scraper plate (13) via a floating joint (141), and a screw sleeve (143) screwed onto the outside of the screw (142), which is rotatably fitted on a bracket on the outside of the extrusion arc plate (12).

4. A doctor blade structure for a coating roll according to claim 2, wherein The adjustment assembly (14) includes a worm gear coaxially fixed to the outer end of the hinge shaft of the scraper plate (13), and a worm gear meshing with the worm gear is rotatably fitted on the bracket on the outer side of the extrusion arc plate (12).

5. A doctor blade arrangement for a coating roll according to claim 2 or 3 or 4, characterized in that The extrusion arc plate (12) has an outwardly expanding arc neck (121) at the outlet of the extrusion channel, and the scraper plate (13) is installed on the outer edge of the arc neck (121).

6. A doctor blade structure for a coating roll according to claim 1 or 2 or 3 or 4, wherein The lower part of the scraper (10) is equipped with a return trough (20) for receiving the scraped adhesive liquid, and the lower outlet of the return trough (20) points to the adhesive liquid tank (b).

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