Coating head of slit type coating machine for thermo-sensitive paper processing

Abstract

The utility model relates to the field of coating machines, in particular to a coating head of a slit type coating machine for thermo-sensitive paper processing, which comprises a left die head and a right die head, positioning components are arranged at two ends of the left die head and the right die head in the length direction, a plurality of fixing parts are arranged between the left die head and the right die head, the right die head is provided with a first trough and a second trough, and the first trough and the second trough are communicated with each other. The second material groove is located below the first material groove, the sectional area of the vertical section of the second material groove is smaller than that of the first material groove, a slit groove is formed in the position, below the first material groove, of the right die head, the first material groove, the second material groove and the slit groove are all arranged in the length direction of the right die head in a penetrating mode, and cover plates are arranged at the two ends of the length direction of the right die head. A first feeding hole communicated with the middle of the first trough is formed in the right die head, and second feeding holes communicated with the first trough are formed in the two cover plates in a penetrating manner; through the arrangement of the first material groove, the second material groove, the first feeding hole and the two second feeding holes, the effect of uniformly discharging material liquid in the coating process is achieved.

Description

Technical Field

[0001] The present application relates to the field of coating machines, and in particular to a coating head of a slit coating machine for processing thermal paper. Background Art

[0002] Thermal paper is specially used for thermal printers and thermal fax machines. Its production principle is to coat ordinary paper with microparticle powder, which is composed of colorless dyes such as phenol or other acidic substances, separated by a film. Under heating conditions, the film melts and the powder mixes to react with color. Coating machines are mainly used for surface coating of films, paper, etc., coating a layer of glue, coating or ink with specific functions on the rolled substrate, and then cutting into sheets or rolling after drying. Therefore, coating machines are often used to process thermal paper and apply coatings on it.

[0003] In the related technology, a Chinese patent with application number 201920278854.4 proposes a slit coater for high-precision adjustment of the level of a coating head, including a coating head connecting plate, a coating head fixing plate, two spiral micrometer heads, a first spiral micrometer head fixture, two second spiral micrometer head fixtures, a bearing, a coating head, and two thrust plates.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: a material trough is provided in the existing coating head, which is directly connected to the slit. The coating liquid enters the material trough through the liquid inlet pipe and overflows from the slit to coat the paper base. However, the coating liquid filling speed is slow at the position of the material trough far away from the liquid inlet pipe, and thus the speed at which the coating liquid overflows from the corresponding slit is also slow, which can easily cause uneven material discharge from the coating head during the coating process, resulting in uneven coating thickness. Utility Model Content

[0005] In order to improve the problem of uneven material discharge from a coating head during the coating process, the present application provides a coating head for a slit coater for processing thermal paper.

[0006] The coating head of a slit coating machine for thermal paper processing provided in the present application adopts the following technical solution:

[0007] A coating head of a slit coater for processing thermal paper comprises a left die head and a right die head, wherein both ends of the left die head and the right die head in the length direction are provided with positioning components for aligning with each other, a plurality of fixing parts are provided between the left die head and the right die head, a first material trough and a second material trough are provided on a side of the right die head facing the left die head, the second material trough is located below the first material trough and the cross-sectional area of ​​the vertical section is smaller than that of the first material trough, a slit groove for forming a slit between the left die head and the right die head is provided at the bottom of the first material trough, the first material trough, the second material trough and the slit groove are all arranged through the length direction of the right die head, and both ends of the right die head in the length direction are provided with cover plates for closing the first material trough, the second material trough and the ends of the slit groove, the right die head is provided with a first feed hole connected to the middle of the first material trough, and the two cover plates are both provided with second feed holes connected to the first material trough.

[0008] By adopting the above technical scheme, the positioning component is used to facilitate the mutual alignment of the left die head and the right die head, so as to facilitate the subsequent assembly and fixation of the left die head and the right die head. At the same time, the liquid is injected from the first feed hole and the two second feed holes, which is conducive to the liquid filling the first material trough faster and more evenly, and the liquid enters the second material trough through the slit groove; since the cross-sectional area of ​​the second material trough is smaller than that of the first material trough, the volume of the second material trough is smaller, and it is easier to fill the liquid, and the capacity of the liquid from the first material trough to the second material trough is from large to small, forming a pressure gradient, and the pressure generated by the liquid in the first material trough exerts a downward extrusion force on the liquid in the second material trough, so that the second material trough is convenient for evenly discharging the liquid from the slit groove on its lower side; the cover plate is used to prevent the liquid from overflowing from the first material trough, the second material trough and the end of the slit groove, so that the coating head can discharge the liquid evenly during the coating process, which is conducive to the processing to form a coating with uniform thickness.

[0009] Optionally, the vertical cross-section of the first material trough in the width direction of the right die head is set to be a semicircle, and the vertical cross-section of the second material trough in the width direction of the right die head is set to be a half teardrop-shaped arc.

[0010] By adopting the above technical solution, the first trough and the second trough can be filled with liquid more efficiently, and the liquid can flow downward more smoothly, further promoting uniform discharge of the slit trough.

[0011] Optionally, the area of ​​the vertical cross-section of the first material trough in the width direction of the right die head gradually decreases in the direction away from the first feed hole.

[0012] By adopting the above technical solution, the space in the middle of the first material trough is larger than that at both ends thereof, thereby preventing more liquid from overflowing from the middle of the first material trough and helping the liquid to fill the first material trough more evenly.

[0013] Optionally, the positioning assembly includes a positioning bar and a plurality of cylindrical pins, and the left die head and the right die head are provided with positioning grooves at the ends in the length direction, and the two positioning grooves are arranged through the width direction of the left die head and the right die head and are aligned and connected to each other, and the positioning bar is plugged and matched with the two positioning grooves, and the plurality of cylindrical pins are passed through the positioning bar and plugged into the left die head or the right die head.

[0014] By adopting the above technical solution, the positioning strip is fixed to the left die head and the right die head using cylindrical pins. The positioning strip is conducive to the initial fixation and alignment of the left die head and the right die head to facilitate the subsequent fixation of the left die head and the right die head.

[0015] Optionally, the left die head and the right die head are each provided with a plug-in groove at the bottom of the positioning groove, and the left die head and the right die head are each fixedly connected with a magnet block in the plug-in groove, and the positioning bar is fixedly connected with two iron pillars, and the two iron pillars are respectively plugged and adapted with the two plug-in grooves and fixed with the magnet block by magnetic attraction.

[0016] By adopting the above technical solution, the positioning groove runs through the ends of the left die head and the right die head, which is convenient for turning the positioning groove during the processing. The positioning strip is inserted into the positioning groove and the two iron pillars are respectively inserted into the two insertion grooves. The two iron pillars are respectively fixed to the two magnet blocks by magnetic attraction, which is conducive to the initial fixation of the positioning strip in the positioning groove, so as to facilitate the subsequent installation of the cylindrical pin.

[0017] Optionally, the fixing member is configured as a first screw, and the left die head and the right die head are fixed to each other via a plurality of the first screws.

[0018] By adopting the above technical solution, after the left die head and the right die head are aligned with each other, the left die head and the right die head can be fixed by using a plurality of first screws.

[0019] Optionally, a rubber layer is fixedly connected to a side of the cover plate facing the right die head, and the cover plate is fixed to the left die head and the right die head respectively by a plurality of second screws.

[0020] By adopting the above technical solution, the cover plate is fixed to the left die head and the right die head using multiple second screws, so that the rubber layer is tightly pressed against the left die head and the right die head, thereby preventing the liquid from overflowing from the ends of the first trough, the second trough and the slit groove.

[0021] Optionally, the ends of the left die head and the right die head in the length direction are provided with mounting grooves, the cover plate is fixed at the mounting grooves, and the cover plate is flush with the ends of the left die head and the right die head in the length direction in the vertical direction.

[0022] By adopting the above technical solution, the cover plate is fixed in the installation groove, which is conducive to the cover plate being flush with the ends of the left die head and the right die head, and is conducive to making the structure of the coating head more compact and beautiful.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The liquid is injected into the first trough through the first feed hole and the two second feed holes respectively. The second trough has a smaller volume and is easier to fill with liquid. The pressure generated by the liquid in the first trough exerts a downward squeezing force on the liquid in the second trough, so that the second trough evenly discharges the liquid from the slit groove on its lower side, thus achieving the effect of evenly discharging the liquid from the coating head during the coating process;

[0025] 2. The space in the middle of the first trough is larger than that at both ends, and the first trough and the second trough are semi-arc-shaped, which is conducive to the liquid to fill the first trough and the second trough more efficiently and evenly, and is conducive to the liquid to flow downward more smoothly, thereby further promoting uniform discharge of the slit trough;

[0026] 3. The two iron columns are respectively fixed to the magnet blocks by magnetic attraction in the two plug-in slots, which is beneficial for the cylindrical pin to fix the positioning strip. The positioning strip is used to facilitate the mutual alignment of the left die head and the right die head, so that the left die head and the right die head can be fixed with multiple first screws later, which is beneficial to improve the assembly efficiency of the left die head and the right die head. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0028] Figure 2 It is a front view of the embodiment of the present application after removing the cover plate.

[0029] Figure 3 It is a schematic structural diagram of the right die head in the embodiment of the present application.

[0030] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0031] Figure numerals: 1. left die head; 2. right die head; 3. first screw; 4. first material trough; 5. second material trough; 6. slit groove; 7. cover plate; 8. first feed hole; 9. second feed hole; 10. positioning strip; 11. cylindrical pin; 12. positioning groove; 13. plug-in groove; 14. magnet block; 15. mounting groove; 16. rubber layer; 17. second screw. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-4 This application is described in further detail.

[0033] The embodiment of the present application discloses a coating head of a slit coater for processing thermal paper.

[0034] Reference Figure 1 The coating head of the slit coater for thermal paper processing includes a left die head 1 and a right die head 2 which are symmetrically arranged. Positioning components for aligning with each other are arranged at both ends of the length direction of the left die head 1 and the right die head 2. A plurality of fixing parts are arranged between the left die head 1 and the right die head 2. The fixing parts are arranged as first screws 3. The left die head 1 and the right die head 2 are fixed to each other by a plurality of first screws 3. The first screws 3 are hexagon socket head screws. After the left die head 1 and the right die head 2 are assembled, the upper part is a rectangle and the lower part has a triangular tip.

[0035] Reference Figure 2 A first material trough 4 and a second material trough 5 are provided on the side of the right die head 2 facing the left die head 1. The second material trough 5 is located below the first material trough 4 and the cross-sectional area of ​​the vertical section is smaller than the first material trough 4. A slit groove 6 for forming a slit between the left die head 1 and the right die head 2 is provided below the first material trough 4 of the right die head 2. The first material trough 4, the second material trough 5 and the slit groove 6 are all arranged to penetrate along the length direction of the right die head 2.

[0036] Reference Figure 1 and Figure 2 Both ends of the right die head 2 in the length direction are provided with cover plates 7 for closing the ends of the first material trough 4, the second material trough 5 and the slit groove 6. The right die head 2 is provided with a first feed hole 8 connected to the middle of the first material trough 4, and the two cover plates 7 are penetrated by a second feed hole 9 connected to the first material trough 4.

[0037] The positioning assembly is used to facilitate the mutual alignment of the left die head 1 and the right die head 2, so that the left die head 1 and the right die head 2 can be fixed later using a plurality of first screws 3. The liquid is injected from the first feed hole 8 toward the middle of the first feed trough 4, and the liquid is injected from the two second feed holes 9 toward the two ends of the first feed trough 4. By injecting the liquid from the first feed hole 8 and the two second feed holes 9 at the same time, the liquid is conducive to filling the first feed trough 4 faster and more evenly.

[0038] The liquid material entering the first material trough 4 enters the second material trough 5 through the slit groove 6. Since the cross-sectional area of ​​the second material trough 5 is smaller than that of the first material trough 4, the volume of the second material trough 5 is smaller and it is easier to fill the liquid material, so that the second material trough 5 can evenly discharge the liquid material from the slit groove 6 on its lower side. The cover plate 7 is used to prevent the liquid material from overflowing from the first material trough 4, the second material trough 5 and the ends of the slit groove 6.

[0039] Furthermore, the volume of the liquid from the first trough 4 to the second trough 5 decreases, forming a pressure gradient. The pressure generated by the liquid in the first trough 4 exerts a downward extrusion force on the liquid in the second trough 5, further facilitating the liquid to be evenly discharged from the lower end of the slit groove 6, thereby achieving the effect of evenly discharging the liquid from the coating head during the coating process, and facilitating the processing to form a coating with uniform thickness.

[0040] In addition, the first material trough 4, the second material trough 5 and the slit groove 6 are all arranged along the length direction of the right die head 2, which is more conducive to processing and helps to improve the grooving efficiency during the processing of the right die head 2. The first material trough 4 is used as the dividing line for cutting the slit groove 6, which is conducive to more efficient cutting and forming of the slit groove 6.

[0041] Reference Figure 2 and Figure 3 In order to further promote uniform discharge of the slit groove 6, the vertical section of the first material trough 4 in the width direction of the right die head 2 is set to be a semicircle, and the vertical section of the second material trough 5 in the width direction of the right die head 2 is set to be half a teardrop-shaped arc. The area of ​​the vertical section of the first material trough 4 in the width direction of the right die head 2 gradually decreases in the direction away from the first feed hole 8.

[0042] Since the first feed hole 8 is connected to the middle of the first material trough 4, the two second feed holes 9 are located at the two ends of the first material trough 4, and the space in the middle of the first material trough 4 is larger than that at its two ends, it is helpful to prevent more liquid from overflowing from the middle of the first material trough 4, and it is helpful to fill the first material trough 4 with liquid more evenly; the shapes of the first material trough 4 and the second material trough 5 are helpful to fill the first material trough 4 and the second material trough 5 more efficiently with liquid, and to facilitate the liquid to flow downward more smoothly, thereby further promoting uniform discharge of the slit groove 6.

[0043] Reference Figure 1 and Figure 4 In order to facilitate the mutual fixation of the left die head 1 and the right die head 2, the positioning component includes a rectangular positioning bar 10 and a plurality of cylindrical pins 11. The ends of the left die head 1 and the right die head 2 in the length direction are provided with positioning grooves 12. The two positioning grooves 12 are both arranged through the width direction of the left die head 1 and the right die head 2 and are aligned and connected to each other. The positioning bar 10 is plugged and matched with the two positioning grooves 12. The plurality of cylindrical pins 11 are passed through the positioning bar 10 and plugged into the left die head 1 or the right die head 2.

[0044] Reference Figure 1 and Figure 4 The left die head 1 and the right die head 2 are both provided with a circular plug-in groove 13 at the bottom of the positioning groove 12. The left die head 1 and the right die head 2 are both fixedly connected with a circular magnet block 14 in the plug-in groove 13. The positioning bar 10 is fixedly connected with two cylindrical iron pillars (not shown in the figure), and the two iron pillars are respectively plugged and adapted with the two plug-in grooves 13 and fixed with the magnet block 14 by magnetic attraction.

[0045] The positioning groove 12 runs through the ends of the left die head 1 and the right die head 2, which is convenient for turning the positioning groove 12 during the processing. The positioning strip 10 is inserted into the positioning groove 12 and the two iron pillars are respectively inserted into the two insertion grooves 13. The two iron pillars are respectively fixed to the two magnet blocks 14 by magnetic attraction, which is conducive to the initial fixation of the positioning strip 10 in the positioning groove 12, and is conducive to preventing the left die head 1 and the right die head 2 from moving in the horizontal direction in directions away from each other, so as to facilitate the subsequent installation of the cylindrical pin 11; the cylindrical pin 11 is used to fix the positioning strip 10 to the left die head 1 and the right die head 2, and the positioning strip 10 is conducive to the initial fixation and alignment of the left die head 1 and the right die head 2, so as to facilitate the subsequent use of multiple first screws 3 to fix the left die head 1 and the right die head 2.

[0046] Reference Figure 1 The ends of the left die head 1 and the right die head 2 in the length direction are both provided with mounting grooves 15, and the cover plate 7 is fixed at the mounting groove 15. The side of the cover plate 7 facing the right die head 2 is fixedly connected with a rubber layer 16. The cover plate 7 is fixed to the left die head 1 and the right die head 2 by a plurality of second screws 17 respectively, and the cover plate 7 is flush with the ends of the left die head 1 and the right die head 2 in the length direction along the vertical direction.

[0047] A plurality of second screws 17 are used to fix the cover plate 7 to the left die head 1 and the right die head 2 in the mounting groove 15, so that the rubber layer 16 is pressed against the left die head 1 and the right die head 2, thereby preventing the liquid from overflowing from the ends of the first material trough 4, the second material trough 5 and the slit groove 6. The cover plate 7 is fixed in the mounting groove 15, which facilitates the cover plate 7 to be flush with the ends of the left die head 1 and the right die head 2, and facilitates the structure of the coating head to be more compact and beautiful.

[0048] The implementation principle of the coating head of a slit coater for thermal paper processing in the embodiment of the present application is:

[0049] The two iron pillars are magnetically fixed to the magnet blocks 14 in the two plug-in grooves 13, which facilitates the cylindrical pin 11 to fix the positioning bar 10. The positioning bar 10 facilitates the left die head 1 and the right die head 2 to be aligned with each other, so that the left die head 1 and the right die head 2 can be fixed later using multiple first screws 3.

[0050] The liquid is injected into the first trough 4 through the first feed hole 8 and the two second feed holes 9 respectively, and the space in the middle of the first trough 4 is larger than that at both ends thereof, which is conducive to the liquid filling the first trough 4 faster and more evenly. The liquid entering the first trough 4 enters the second trough 5 through the slit groove 6, and the cover plate 7 is used to prevent the liquid from overflowing from the first trough 4, the second trough 5 and the ends of the slit groove 6.

[0051] The second material trough 5 has a smaller volume and is easier to fill with liquid. The pressure generated by the liquid in the first material trough 4 applies a downward extrusion force to the liquid in the second material trough 5. The first material trough 4 and the second material trough 5 are semi-arc-shaped, so that the liquid flows downward more smoothly, thereby facilitating the second material trough 5 to evenly discharge the liquid from the slit groove 6 on its lower side, thereby achieving the effect of evenly discharging the liquid from the coating head during the coating process, which is conducive to the processing to form a coating with uniform thickness.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A coating head of a slot coating machine for thermal paper processing, characterized in that: The invention comprises a left die head (1) and a right die head (2), wherein both ends of the left die head (1) and the right die head (2) in the length direction are provided with positioning components for aligning with each other, a plurality of fixing parts are provided between the left die head (1) and the right die head (2), a first material trough (4) and a second material trough (5) are provided on the side of the right die head (2) facing the left die head (1), the second material trough (5) is located below the first material trough (4) and has a smaller cross-sectional area in the vertical section than the first material trough (4), and the right die head (2) is provided with a first material trough (4) and a second material trough (5) for aligning the left die head (1) and the right die head (2) below the first material trough (4). The right die head (2) has a slit groove (6) formed between the first and second material grooves (4), the second material groove (5) and the slit groove (6) are all arranged along the length direction of the right die head (2), and both ends of the right die head (2) in the length direction are provided with cover plates (7) for closing the ends of the first material groove (4), the second material groove (5) and the slit groove (6). The right die head (2) is provided with a first feed hole (8) connected to the middle of the first material groove (4), and the two cover plates (7) are both provided with second feed holes (9) connected to the first material groove (4).

2. The coating head of the slot coater for thermal paper processing according to claim 1, characterized in that: The vertical cross-section of the first material trough (4) in the width direction of the right die head (2) is set to be a semicircle, and the vertical cross-section of the second material trough (5) in the width direction of the right die head (2) is set to be a half-teardrop-shaped arc.

3. The coating head of the slot coater for thermal paper processing according to claim 1, characterized in that: The area of ​​the vertical cross section of the first material trough (4) in the width direction of the right die head (2) gradually decreases in a direction away from the first material feed hole (8).

4. The coating head of the slot coater for thermal paper processing according to claim 1, characterized in that: The positioning assembly comprises a positioning strip (10) and a plurality of cylindrical pins (11); the ends of the left die head (1) and the right die head (2) in the length direction are provided with positioning grooves (12); the two positioning grooves (12) are arranged to penetrate along the width direction of the left die head (1) and the right die head (2) and are aligned and connected to each other; the positioning strip (10) is plugged and matched with the two positioning grooves (12); the plurality of cylindrical pins (11) are passed through the positioning strip (10) and plugged into the left die head (1) or the right die head (2).

5. The coating head of the slot coater for thermal paper processing according to claim 4, characterized in that: The left die head (1) and the right die head (2) are both provided with a plug-in groove (13) at the bottom of the positioning groove (12); the left die head (1) and the right die head (2) are both fixedly connected with a magnet block (14) in the plug-in groove (13); the positioning bar (10) is fixedly connected with two iron pillars; the two iron pillars are respectively plugged and adapted with the two plug-in grooves (13) and fixed with the magnet block (14) by magnetic attraction.

6. The coating head of the slot coater for thermal paper processing according to claim 1, characterized in that: The fixing member is configured as a first screw (3), and the left die head (1) and the right die head (2) are fixed to each other via a plurality of the first screws (3).

7. The coating head of the slot coater for thermal paper processing according to claim 1, characterized in that: A rubber layer (16) is fixedly connected to the side of the cover plate (7) facing the right die head (2), and the cover plate (7) is fixed to the left die head (1) and the right die head (2) respectively by a plurality of second screws (17).

8. The coating head of the slot coater for thermal paper processing according to claim 1, characterized in that: The ends of the left die head (1) and the right die head (2) in the length direction are both provided with mounting grooves (15), the cover plate (7) is fixed at the mounting grooves (15), and the cover plate (7) is flush with the ends of the left die head (1) and the right die head (2) in the length direction in the vertical direction.

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