Scratch-free hot melt adhesive coating die head

Abstract

The utility model provides a scratch-free hot melt adhesive coating die head which comprises an upper die, an upper die insert, a lower die, a lower die insert, a gasket and a die locking screw, the lower die is provided with a lower die feeding channel and a first-stage buffer groove, and a series of first runner grooves distributed in the front-back direction are evenly distributed in the position, on the front side of the first-stage buffer groove, of the top face of the lower die in the breadth direction; a second runner groove and a second-stage buffer groove are formed in the top face of the lower die insert, a series of threaded holes are formed in the upper die in the breadth direction, adjusting screws are in threaded connection with the interiors of the threaded holes and inserted into the first runner groove to adjust the height of a runner, and a round installation groove and a core rod are arranged at the bottom of the front end of the upper die insert in the breadth direction. A motor and a bearing seat are installed on the left side and the right side of the upper die respectively, the two ends of the core rod are connected with the motor and the bearing seat respectively, the gaskets are located on the rear side, the left side and the right side of the primary buffer groove, and an extrusion channel is formed in the front area between the upper die and the lower die. The initial stable linear speed is provided for the extruded slurry, and vertical stripe defects are prevented from being generated on the surface of the coating.

Description

Technical Field

[0001] This invention relates to the field of coating die technology, and in particular to a scratch-free hot melt adhesive coating die. Background Technology

[0002] During the coating process, the hot melt adhesive slot coating die moves in a direction parallel to the extrusion slot as the slurry leaves the die lip. The substrate, however, moves perpendicular to the extrusion slot. Therefore, the slurry's direction of movement differs from the substrate's, and it does not exhibit a parallel tendency to move with the substrate. When the slurry is applied to the substrate, relative sliding occurs due to inertia, resulting in vertical lines and defects in the final coating layer. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a scratch-free hot melt adhesive coating die head that can provide the extruded slurry with an initial stable linear speed matching the roller, thereby avoiding vertical lines and defects on the coating surface.

[0004] The technical solution of this invention is a scratch-free hot melt adhesive coating die head, including an upper die, a lower die, and a gasket located between the two. The three components are connected as one unit by a locking screw. The invention is characterized in that: a lower die insert is connected to the top front surface of the lower die; an upper die insert is connected to the bottom front surface of the upper die; the lower die is provided with a lower die feeding channel; a primary buffer groove is provided along the width direction on the top front surface of the lower die; the bottom of the primary buffer groove is connected to the lower die feeding channel; a series of first flow channel grooves arranged in a front-back direction are evenly distributed along the width direction on the top surface of the lower die on the front side of the primary buffer groove; a second flow channel groove is provided on the top surface of the lower die insert, corresponding one-to-one with the first flow channel grooves; and the top surface of the lower die insert is located in the second flow channel. A secondary buffer groove is provided in front of the slot along the width direction. The upper die is provided with a series of vertically arranged threaded holes along the width direction. An adjusting screw is threaded into the threaded hole. After each adjusting screw is rotated, its bottom is inserted into the corresponding first flow channel groove to adjust the flow channel height in the first flow channel groove. A circular mounting groove is provided at the bottom front end of the upper die insert along the width direction. A mandrel is installed in the circular mounting groove. A motor and a bearing seat are respectively installed on the left and right sides of the upper die. One end of the mandrel is driven to rotate by the motor, and the other end of the mandrel is positioned and rotated by the bearing in the bearing seat. The gasket is located behind the primary buffer groove and on the left and right sides. The front area between the upper die and the lower die forms an extrusion channel under the guidance of the gasket.

[0005] Preferably, the motor is connected to the mandrel via a sprocket drive mechanism, which includes a driving sprocket, a driven sprocket, and a mounting bracket, with the mounting bracket fixedly connected to the side of the upper or lower mold.

[0006] Preferably, the bottom surface of the lower mold is connected to a feeding body, the rear side of the feeding body is provided with at least two feeding ports, the front top surface of the feeding body is provided with a three-level buffer groove along the width direction, the feeding ports are connected to the bottom of the three-level buffer groove through the three-level feeding channel, the feeding channel of the lower mold is distributed on the bottom surface of the lower mold, and the top of the three-level buffer groove is connected to the feeding channel of the lower mold.

[0007] Preferably, there are three lower mold feeding channels, distributed in the left, center and right positions on the bottom surface of the lower mold. The spacing between two adjacent lower mold feeding channels, the spacing between the left lower mold feeding channel and the left side of the lower mold, and the spacing between the right lower mold feeding channel and the right side of the lower mold are all corresponding.

[0008] Preferably, the lower part of the front side of the lower mold is connected to an outwardly extending anti-collision baffle.

[0009] Preferably, the outer surface of the mandrel is provided with a series of material storage grooves.

[0010] This invention can provide the extruded slurry with an initial stable linear velocity matching the roller, avoiding vertical lines on the substrate coating surface. At the same time, a series of flow channels inside the die can ensure the uniformity of the slurry in different width directions during the flow process, thus guaranteeing the coating quality. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention;

[0012] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0013] Figure 3 This is an exploded view of the present invention;

[0014] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the present invention;

[0015] Figure 5 This is a schematic diagram of the structure of the lower mold and the lower mold insert in this invention;

[0016] Figure 6 This is a schematic diagram of the structure of the upper mold and the upper mold insert in this invention;

[0017] Wherein: 1—Upper die; 1a—Threaded hole; 2—Lower die; 21—Lower die feed channel; 22—First-stage buffer groove; 23—First flow channel groove; 3—Shim; 4—Mold locking screw; 5—Lower die insert; 51—Second flow channel groove; 52—Second-stage buffer groove; 6—Upper die insert; 61—Circular mounting groove; 7—Adjusting screw; 8—Mandrel; 9—Motor; 10—Bearing seat; 11—Extrusion channel; 12—Sprocket drive mechanism; 13—Feed body; 131—Feed inlet; 132—Third-stage buffer groove; 133—Third-stage feed channel; 14—Anti-collision baffle. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings.

[0019] like Figures 1 to 6 As shown, this invention provides a scratch-free hot melt adhesive coating die head, including an upper die 1, a lower die 2, and a gasket 3 located between the two. The three components are connected as one unit by a locking screw 4. The invention is characterized in that: a lower die insert 5 is connected to the front top surface of the lower die 2; an upper die insert 6 is connected to the front bottom surface of the upper die 1; the lower die 2 is provided with a lower die feed channel 21; a primary buffer groove 22 is provided along the width direction on the front top surface of the lower die 2; the bottom of the primary buffer groove 22 is connected to the lower die feed channel 21; a series of first flow channel grooves 23 are evenly distributed along the width direction on the top surface of the lower die 2 on the front side of the primary buffer groove 22; a second flow channel groove 51 is provided on the top surface of the lower die insert 5, corresponding one-to-one with the first flow channel grooves 23; and the top surface of the lower die insert 5 is located in front of the second flow channel groove 51. The upper die 1 has a secondary buffer groove 52 along its width direction. The upper die 1 has a series of vertically arranged threaded holes 1a along its width direction. An adjusting screw 7 is threaded into the threaded hole 1a. After each adjusting screw 7 is rotated, its bottom is inserted into the corresponding first flow channel groove 23 to adjust the flow channel height in the first flow channel groove 23. The bottom front end of the upper die insert 6 has a circular mounting groove 61 along its width direction. A mandrel 8 is installed in the circular mounting groove 61. A motor 9 and a bearing seat 10 are installed on the left and right sides of the upper die 1, respectively. One end of the mandrel 8 is driven to rotate by the motor 9, and the other end of the mandrel 8 is positioned and rotated by the bearing in the bearing seat 10. The gasket 3 is located behind the primary buffer groove 22 and on the left and right sides. The front area between the upper die 1 and the lower die 2 forms an extrusion channel 11 under the guidance of the gasket 3.

[0020] Based on the above scheme, the motor 9 is connected to the mandrel 8 through the sprocket transmission mechanism 12. The sprocket transmission mechanism 12 includes a driving sprocket, a driven sprocket and a mounting frame. The mounting frame is fixedly connected to the side of the upper mold 1 or the lower mold 2.

[0021] Specifically, the bottom surface of the lower mold 2 is connected to the feed body 13, and the rear side of the feed body 13 is provided with at least two feed ports 131. The front top surface of the feed body 13 is provided with a three-level buffer groove 132 along the width direction. The feed ports 131 are connected to the bottom of the three-level buffer groove 132 through the three-level feed channel 133. The lower mold feed channel 21 is distributed on the bottom surface of the lower mold 2, and the top of the three-level buffer groove 132 is connected to the lower mold feed channel 21.

[0022] In addition, there are three lower mold feeding channels 21, which are distributed in the left, middle and right positions on the bottom surface of the lower mold 2. The spacing between two adjacent lower mold feeding channels 21, the spacing between the left lower mold feeding channel 21 and the left side of the lower mold 2, and the spacing between the right lower mold feeding channel 21 and the right side of the lower mold 2 are all corresponding.

[0023] In addition, the lower part of the front side of the lower die 2 is connected to an outwardly extending anti-collision baffle 14. During the installation process with the front roller, when the die body moves forward, the anti-collision baffle 14 will contact the roller first relative to the die lip, preventing the die lip from hitting and affecting the accuracy of the extrusion channel 11.

[0024] Furthermore, a series of material storage grooves are provided on the outer surface of the mandrel 8.

[0025] The working principle of this invention is as follows:

[0026] The slurry enters through the feed port 131 on the rear side of the feed body 13, and connects to the bottom of the three-stage buffer tank 132 through the three-stage feed channel 133 for the first buffering. After passing through the three-stage buffer tank 132, it reaches the lower die feed channel 21, enters the first-stage buffer tank 22 for the second buffering, and then flows forward through a series of first flow channel 23s, sequentially entering the second flow channel 51, and reaching the front second-stage buffer tank 52 for the third buffering. Finally, it is extruded forward through the extrusion channel 11. During this process, the uniformity of slurry flow in different width directions can be ensured. In addition, the motor 9 controls the rotation of the mandrel 8, giving the mandrel 8 a specific speed corresponding to the speed of the front roller. The storage groove on the surface of the mandrel 8 holds a portion of the slurry. The slurry extruded at the die lip can be evenly coated on the substrate after being given the initial speed by the mandrel 8, forming a dense coating. The vertical lines were originally caused by a mismatch between the rotation speed of the front roller and the extrusion speed of the slurry. This resulted in a relative linear velocity when the substrate came into contact with the slurry, causing the slurry to be pulled forward or stuck, thus producing vertical lines and affecting the coating quality.

[0027] 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 scratch-free hot melt adhesive coating die head, comprising an upper die (1), a lower die (2), and a gasket (3) located between the two, wherein the three are connected as one unit by a locking screw (4), characterized in that: The lower mold (2) is connected to a lower mold insert (5) on its front top surface, and the upper mold (1) is connected to an upper mold insert (6) on its front bottom surface. The lower mold (2) is provided with a lower mold feeding channel (21). The lower mold (2) is provided with a first-level buffer groove (22) along the width direction on its front top surface. The bottom of the first-level buffer groove (22) is connected to the lower mold feeding channel (21). A series of first flow channel grooves (23) are evenly distributed along the width direction on the top surface of the lower mold (2) in front of the first-level buffer groove (22). The lower mold insert (5) is provided with a second flow channel groove (51) corresponding to the first flow channel groove (23) on its top surface. A second-level buffer groove (52) is provided along the width direction in front of the second flow channel groove (51) on the top surface of the lower mold insert (5). The upper mold (1) is provided with a series of vertically arranged... The threaded hole (1a) is connected to the threaded hole (1a) with an adjusting screw (7). After each adjusting screw (7) is rotated, its bottom is inserted into the corresponding first flow channel groove (23) to adjust the flow channel height in the first flow channel groove (23). The bottom front end of the upper die insert (6) is provided with a circular mounting groove (61) along the width direction. The mandrel (8) is installed in the circular mounting groove (61). The upper die (1) is equipped with a motor (9) and a bearing seat (10) on the left and right sides respectively. One end of the mandrel (8) is driven to rotate by the motor (9), and the other end of the mandrel (8) is rotated by the bearing in the bearing seat (10). The gasket (3) is located behind the first-level buffer groove (22) and on the left and right sides. The front area between the upper die (1) and the lower die (2) forms an extrusion channel (11) under the guidance of the gasket (3).

2. The scratch-free hot melt adhesive coating die head according to claim 1, characterized in that: The motor (9) is connected to the mandrel (8) through a sprocket transmission mechanism (12). The sprocket transmission mechanism (12) includes a driving sprocket, a driven sprocket, and a mounting frame. The mounting frame is fixedly connected to the side of the upper mold (1) or the lower mold (2).

3. The scratch-free hot melt adhesive coating die head according to claim 1, characterized in that: The bottom surface of the lower mold (2) is connected to the feed body (13). The rear side of the feed body (13) is provided with at least two feed ports (131). The front top surface of the feed body (13) is provided with a three-level buffer groove (132) along the width direction. The feed port (131) is connected to the bottom of the three-level buffer groove (132) through the three-level feed channel (133). The feed channel (21) of the lower mold is distributed on the bottom surface of the lower mold (2). The top of the three-level buffer groove (132) is connected to the feed channel (21) of the lower mold.

4. The scratch-free hot melt adhesive coating die head according to claim 3, characterized in that: There are three lower mold feeding channels (21), which are distributed in the left, middle and right positions on the bottom surface of the lower mold (2). The spacing between two adjacent lower mold feeding channels (21), the spacing between the left lower mold feeding channel (21) and the left side of the lower mold (2), and the spacing between the right lower mold feeding channel (21) and the right side of the lower mold (2) are all corresponding.

5. The scratch-free hot melt adhesive coating die head according to claim 1, characterized in that: The lower part of the front side of the lower mold (2) is connected to an outwardly extending anti-collision baffle (14).

6. The scratch-free hot melt adhesive coating die head according to claim 1, characterized in that: The outer surface of the mandrel (8) is provided with a series of material storage grooves.

Images