Scratch-free hot melt adhesive coating die head

Abstract

The invention 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] The invention relates to the technical field of coating die heads, in particular to a scratch-free hot melt adhesive coating die head. Background Art

[0002] When the hot melt adhesive slot coating die is used for coating production, the slurry moves in a direction parallel to the extrusion slit when it leaves the die lip. The movement direction of the substrate is perpendicular to the extrusion slit, so the movement direction of the slurry is different from that of the substrate. The slurry has no tendency to move parallel to the substrate. When the slurry is coated on the substrate, the slurry and the substrate slide relative to each other due to inertia, resulting in vertical streaks in the final coating layer. Summary of the invention

[0003] In view of the above problems, the present invention aims to provide a scratch-free hot melt adhesive coating die head, which can give the extruded slurry a matching roller initial stable linear speed and avoid vertical line defects on the coating surface.

[0004] The technical solution of the present invention is a scratch-free hot melt adhesive coating die head, comprising an upper die, a lower die, and a gasket located therebetween, the above three being connected as a whole by a locking screw, characterized in that: the front top surface of the lower die is connected to a lower die insert, the front bottom surface of the upper die is connected to an upper die insert, the lower die is provided with a lower die feed channel, the front top surface of the lower die is provided with a primary buffer groove along the width direction, the bottom of the primary buffer groove is connected to the lower die feed channel, a series of first flow channel grooves arranged in the front and rear directions are evenly distributed on the lower die top surface in front of the primary buffer groove along the width direction, the top surface of the lower die insert is provided with a second flow channel groove corresponding to the first flow channel groove one by one, and the top surface of the lower die insert is located at the second flow channel groove A secondary buffer groove is arranged in front of the groove along the width direction, and the upper mold is provided with a series of vertically arranged threaded holes along the width direction, and the threaded holes are threadedly connected with adjusting screws. After each adjusting screw is rotated, the bottom is inserted into the corresponding first flow channel groove to adjust the flow channel height in the first flow channel groove at that location. A circular mounting groove is arranged at the bottom of the front end of the upper mold insert along the width direction, and a core rod 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 mold, one end of the core rod is driven to rotate by the motor, and the other end of the core rod is positioned and rotated by the bearing in the bearing seat. The gasket is located on the rear side and left and right side areas of the primary buffer groove, and the front area between the upper mold and the lower mold forms an extrusion channel under the guidance of the gasket.

[0005] Preferably, the motor is connected to the core rod via a sprocket transmission mechanism, and the sprocket transmission mechanism includes a driving sprocket, a driven sprocket and a mounting frame, and the mounting frame is fixedly connected to the side of the upper mold or the lower mold.

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

[0007] Preferably, the number of the lower die feed channels is three, distributed at the left, middle and right positions of the bottom surface of the lower die. The spacing between two adjacent lower die feed channels, the spacing between the left lower die feed channel and the left side surface of the lower die, and the spacing between the right lower die feed channel and the right side surface of the lower die are all corresponding.

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

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

[0010] The present invention can give the extruded slurry an initial stable linear speed matching the roller, avoiding vertical line defects on the surface of the substrate coating. At the same time, a series of flow channel structures inside the mold body can ensure the uniformity of the slurry in different width directions during the flow process, thereby ensuring the coating quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of another perspective of the present invention; Figure 3 An exploded view of the present invention; Figure 4 It is a schematic diagram of the internal cross-sectional structure of the present invention; Figure 5 It is a structural schematic diagram of the lower die and the lower die insert in the present invention; Figure 6 It is a structural schematic diagram of the upper mold and the upper mold insert in the present invention; Among them: 1—upper die; 1a—threaded hole; 2—lower die; 21—lower die feed channel; 22—first buffer groove; 23—first flow channel groove; 3—gasket; 4—locking screw; 5—lower die insert; 51—second flow channel groove; 52—secondary buffer groove; 6—upper die insert; 61—circular mounting groove; 7—adjusting screw; 8—core rod; 9—motor; 10—bearing seat; 11—extrusion channel; 12—sprocket transmission mechanism; 13—feed body; 131—feed port; 132—third buffer groove; 133—third feed channel; 14—anti-collision baffle. DETAILED DESCRIPTION

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0013] like Figures 1 to 6 As shown, the present invention provides a scratch-free hot melt adhesive coating die head, comprising an upper die 1, a lower die 2, and a gasket 3 located therebetween, the above three being connected as a whole by a locking screw 4, and characterized in that: the front top surface of the lower die 2 is connected with a lower die insert 5, the front bottom surface of the upper die 1 is connected with an upper die insert 6, the lower die 2 is provided with a lower die feed channel 21, the front top surface of the lower die 2 is provided with a primary buffer groove 22 along the width direction, the bottom of the primary buffer groove 22 is connected with the lower die feed channel 21, the top surface of the lower die 2 in front of the primary buffer groove 22 is uniformly distributed with a series of first flow channel grooves 23 arranged in the front and rear directions along the width direction, the top surface of the lower die insert 5 is provided with a second flow channel groove 51 corresponding to the first flow channel groove 23 one by one, and the top surface of the lower die insert 5 is located in front of the second flow channel groove 51 A secondary buffer groove 52 is provided along the width direction, and the upper mold 1 is provided with a series of vertically arranged threaded holes 1a along the width direction. The threaded holes 1a are threadedly connected with adjusting screws 7. After each adjusting screw 7 is rotated, the bottom is inserted into the corresponding first flow channel groove 23 to adjust the flow channel height in the first flow channel groove 23 at that location. A circular mounting groove 61 is provided at the bottom of the front end of the upper mold insert 6 along the width direction, and a core rod 8 is installed in the circular mounting groove 61. A motor 9 and a bearing seat 10 are respectively installed on the left and right sides of the upper mold 1. One end of the core rod 8 is driven to rotate by the motor 9, and the other end of the core rod 8 is positioned and rotated by the bearing in the bearing seat 10. The gasket 3 is located on the rear side and left and right side areas of the primary buffer groove 22, and the front area between the upper mold 1 and the lower mold 2 forms an extrusion channel 11 under the guidance of the gasket 3.

[0014] On the basis of the above scheme, the motor 9 is connected to the core rod 8 through a sprocket transmission mechanism 12, and the sprocket transmission mechanism 12 includes a driving sprocket, a driven sprocket and a mounting frame, and the mounting frame is fixedly connected to the side of the upper mold 1 or the lower mold 2.

[0015] Specifically, the bottom surface of the lower mold 2 is connected to a feed body 13, and at least two feed ports 131 are provided on the rear side of the feed body 13. A three-level buffer groove 132 is provided on the front top surface of the feed body 13 along the width direction. The feed port 131 is connected inwardly through a three-level feed channel 133 to the bottom of the three-level buffer groove 132. 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.

[0016] In addition, there are three lower mold feed channels 21, which are distributed at the left, middle and right positions of the bottom surface of the lower mold 2. The spacing between two adjacent lower mold feed channels 21, the spacing between the left lower mold feed channel 21 and the left side surface of the lower mold 2, and the spacing between the right lower mold feed channel 21 and the right side surface of the lower mold 2 are all corresponding.

[0017] In addition, the lower portion of the front side of the lower mold 2 is connected with an outwardly extending anti-collision baffle 14. During the installation process with the roller in front, when the mold body moves forward, the anti-collision baffle 14 will first contact the roller relative to the die lip to prevent the die lip from hitting and affecting the accuracy of the extrusion channel 11.

[0018] Furthermore, a series of material storage grooves are provided on the outer surface of the core rod 8 .

[0019] The working principle of the present invention is as follows: The slurry enters from the feed port 131 on the rear side of the feed body 13, and is connected to the bottom of the third-level buffer tank 132 through the third-level feed channel 133 to achieve the first buffering, and then reaches the lower die feed channel 21 through the third-level buffer tank 132, and enters the first-level buffer tank 22 to achieve the second buffering, and then flows forward through a series of first flow channel grooves 23, and successively enters the second flow channel grooves 51, and reaches the second-level buffer tank 52 in front to achieve the third buffering, and then is extruded forward through the extrusion channel 11. In this process, the uniformity of the 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 rotation speed corresponding to the rotation speed of the roller in front. The storage groove on the surface of the mandrel 8 accommodates a part of the slurry. The slurry extruded at the die lip can be evenly coated on the substrate after the initial speed given by the mandrel 8 to form a dense coating. The original vertical lines were mainly caused by the fact that the rotation speed of the front roller did not correspond to the speed of slurry extrusion, which caused a relative linear speed when the substrate came into contact with the slurry, causing the slurry to be pulled forward or retained, thus producing vertical lines that affected the coating quality.

[0020] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the invention. Any simple modification, equivalent change or modification made to the above embodiments based on the technical principle of the present invention still falls 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 therebetween, the three being connected into one by a locking screw (4), characterized in that: The front top surface of the lower mold (2) is connected to the lower mold insert (5), the front bottom surface of the upper mold (1) is connected to the upper mold insert (6), the lower mold (2) is provided with a lower mold feed channel (21), the front top surface of the lower mold (2) is provided with a first buffer groove (22) along the width direction, the bottom of the first buffer groove (22) is connected to the lower mold feed channel (21), the top surface of the lower mold (2) in front of the first buffer groove (22) is uniformly distributed with a series of first flow channel grooves (23) arranged in the front and rear directions along the width direction, the top surface of the lower mold insert (5) is provided with a second flow channel groove (51) corresponding to the first flow channel groove (23), the top surface of the lower mold insert (5) is provided with a secondary buffer groove (52) in front of the second flow channel groove (51) along the width direction, and the upper mold (1) is provided with a series of vertically arranged The threaded hole (1a) is provided with a threaded adjusting screw (7) connected to the inner thread of the threaded hole (1a). After each adjusting screw (7) is rotated, the bottom is inserted into the corresponding first flow channel groove (23) to adjust the flow channel height in the first flow channel groove (23) at that location. A circular mounting groove (61) is provided at the bottom of the front end of the upper mold insert (6) along the width direction. A core rod (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 mold (1), respectively. One end of the core rod (8) is driven to rotate by the motor (9), and the other end of the core rod (8) is positioned and rotated by the bearing in the bearing seat (10). The gasket (3) is located at the rear side and left and right side areas of the primary buffer groove (22). The front area between the upper mold (1) and the lower mold (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 core rod (8) via a sprocket transmission mechanism (12), wherein the sprocket transmission mechanism (12) comprises a driving sprocket, a driven sprocket and a mounting frame, wherein 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 a feed body (13), the rear side surface 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 inwardly 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).

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

5. The scratch-free hot melt adhesive coating die head according to claim 1, characterized in that: The lower portion 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 core rod (8) is provided with a series of material storage grooves.

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