Curtain type coating die head

Abstract

The curtain type coating die head comprises an upper die and a lower die with the front ends inclined upwards, the rear portions of the upper die and the lower die are connected into a whole through die locking screws, the left side face and the right side face of the upper die and the left side face and the right side face of the lower die are provided with a left side plate assembly and a right side plate assembly respectively, and the rear side face of the lower die is provided with a feeding port. A first-stage buffer cavity is formed in the middle area of the top face of the lower die in the breadth direction, the bottom face of the first-stage buffer cavity communicates with the feeding port through a feeding channel, an extrusion channel is formed in the position, on the front side of the first-stage buffer cavity, of the top face of the lower die, and a second-stage buffer cavity is formed in the position, on the front side of the first-stage buffer cavity, of the top face of the lower die in the breadth direction. The bottom face of the front side face of the lower die extends downwards to form an arc-shaped guide part. The die head is not in contact with the base material, the extruded material slides to the surface of the base material through the gravity of the material, and a uniform and compact coating is formed on the surface of the base material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coating die, in particular to a curtain coating die. BACKGROUND

[0002] Compared with the standard hot melt adhesive coating die in which the die directly contacts with the substrate during coating, for elastic substrate elastic materials such as PU, TPU film, elastic cloth and the like, the tension balance of the substrate will be affected when the die contacts with the substrate. For porous substrate and rough surface substrate such as medical tape water-jet cloth, wire harness tape velvet, textile fabric, kraft paper tape kraft paper, sandpaper and the like, the die lip will be worn when the die contacts with the substrate. Therefore, it is necessary to design a die which does not contact with the substrate. SUMMARY

[0003] In view of the above problems, the present application aims to provide a curtain coating die which does not contact with the substrate, and the material is extruded and then slides to the surface of the substrate by its own gravity to form a uniform and dense coating layer on the surface of the substrate.

[0004] The technical scheme of the present application is a curtain coating die, characterized in that: it comprises an upper die and a lower die which are upwardly inclined at the front end, the rear parts of the upper die and the lower die are connected into one body through locking screws, the left and right sides of the upper die and the lower die are respectively provided with left and right side plate assemblies, the rear side of the lower die is provided with a feeding port, a primary buffer chamber is arranged in the middle region of the top surface of the lower die along the width direction, the bottom surface of the primary buffer chamber is connected in communication with the feeding port through a feeding channel, an extrusion channel is arranged in the top surface of the lower die at the front side of the primary buffer chamber, a secondary buffer chamber is arranged in the top surface of the lower die at the front side of the primary buffer chamber along the width direction, and the bottom surface of the front side of the lower die extends downward to form an arc-shaped guide portion.

[0005] Preferably, the depth and width of the primary buffer chamber are greater than those of the secondary buffer chamber.

[0006] Preferably, the feeding port is arranged in the middle of the rear side of the lower die.

[0007] Preferably, the upper die and the lower die are provided with a middle die therebetween, and the three are locked into one body by locking screws, the bottom surface of the middle die corresponds to the bottom surface of the upper die, and the top surface of the middle die corresponds to the top surface of the lower die and is provided with an extrusion channel, a first-stage buffer chamber and a second-stage buffer chamber, the middle die is provided with a feeding port and a feeding channel corresponding to the lower die, the bottom surface of the middle die and the front top surface of the lower die form a first layer of extrusion channels, the upper die and the front top surface of the middle die form a second layer of extrusion channels, and the front top surface of the lower die and the front top surface of the middle die are provided with a circular arc guide area.

[0008] Preferably, the upper die and the lower die are provided with n middle dies stacked from bottom to top therebetween, 10≥n≥2, the die head is locked into one body by locking screws, the bottom surface of the middle die corresponds to the bottom surface of the upper die, and the top surface of the middle die corresponds to the top surface of the lower die and is provided with an extrusion channel, a first-stage buffer chamber and a second-stage buffer chamber, the middle die is provided with a feeding port and a feeding channel corresponding to the lower die, the bottom surface of the lowermost middle die and the front top surface of the lower die form a first layer of extrusion channels, the extrusion channels are formed between the upper and lower adjacent middle dies, the upper die and the front top surface of the nth middle die form an (n+1)th layer of extrusion channels, and the front top surface of the lower die and the front top surface of all the middle dies are provided with a circular arc guide area.

[0009] The raw material is uniformly extruded in different width directions after passing through the two-stage buffer chambers, the die head does not contact the base material, the material is slid to the surface of the base material by its own gravity after being extruded, and a uniform and dense coating is formed on the surface of the base material. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a first structure diagram of the application;

[0011] Figure 2 It is an exploded view of Figure 1 ;

[0012] Figure 3 It is an internal cross-sectional structure diagram of Figure 1 ;

[0013] Figure 4 It is a second structure diagram of the application;

[0014] Figure 5 It is an exploded view of Figure 4 ;

[0015] Figure 6 It is an internal cross-sectional structure diagram of Figure 4 ;

[0016] Wherein: 1—Upper mold; 2—Lower mold; 21—Feed inlet; 22—Primary buffer chamber; 23—Feed channel; 24—Extrusion channel; 25—Secondary buffer chamber; 26—Arc-shaped guide section; 3—Mold locking screw; 4—Left side plate assembly; 5—Right side plate assembly; 6—Roller; 7—Middle mold; 8—Arc-shaped guide area. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] like Figures 1 to 3 As shown, the present invention provides a curtain-type coating die head, including an upper die 1 and a lower die 2 with the front end inclined upward. The rear ends of the upper die 1 and the lower die 2 are connected as one piece by a locking screw 3. The left and right sides of the upper die 1 and the lower die 2 are respectively provided with a left side plate assembly 4 and a right side plate assembly 5. The rear side of the lower die 2 is provided with a feed inlet 21. The middle area of ​​the top surface of the lower die 2 is provided with a primary buffer chamber 22 along the width direction. The bottom surface of the primary buffer chamber 22 is connected to the feed inlet 21 through a feed channel 23. An extrusion channel 24 is provided on the top surface of the lower die 2 on the front side of the buffer chamber 22. A secondary buffer chamber 25 is provided on the top surface of the lower die 2 along the width direction in front of the primary buffer chamber 22. The bottom surface of the front side of the lower die 2 extends downward to form an arc-shaped guide 26. After the raw material enters from the feed port 21, it is buffered by the primary buffer chamber 22 and then enters the extrusion channel 24. After being buffered by the secondary buffer chamber 25, it is evenly extruded and flows evenly down along the front side of the lower die 2, and then drips evenly onto the substrate on the surface of the roller 6 through the arc-shaped guide 26.

[0019] In the above scheme, the depth and width of the primary buffer chamber 22 are both greater than the depth and width of the secondary buffer chamber 25.

[0020] In addition, the feed port 21 is located in the middle of the rear side of the lower mold 2.

[0021] Furthermore, a middle mold 7 is provided between the upper mold 1 and the lower mold 2. The above three are locked together by locking screws 3. The bottom surface of the middle mold 7 corresponds to the bottom surface of the upper mold 1. The top surface of the middle mold 7 is provided with an extrusion channel, a primary buffer chamber 22, and a secondary buffer chamber 25 at a position corresponding to the top surface of the lower mold 2. The middle mold 7 is provided with a feed port 21 and a feed channel 23 corresponding to the lower mold 2. The bottom surface of the middle mold 7 and the front top surface of the lower mold 2 form a first layer of extrusion channels. The upper mold 1 and the front top surface of the middle mold 7 form a second layer of extrusion channels. The front top surfaces of the lower mold 2 and the middle mold 7 are provided with arc-shaped guide areas 8.

[0022] In addition, n intermediate molds 7 are stacked from bottom to top between the upper mold 1 and the lower mold 2, where 10 ≥ n ≥ 2, as shown in the example. Figures 4 to 6As shown, here n=2, the die is locked by the locking screw 3, the bottom surface of the middle die 7 corresponds to the bottom surface of the upper die 1, the top surface of the middle die 7 corresponds to the top surface of the lower die 2, and the extrusion channel, the first buffer chamber 22 and the second buffer chamber 25 are arranged at the corresponding position, the middle die 7 is provided with the feeding port 21 and the feeding channel 23 corresponding to the lower die 2, the bottom surface of the lowermost middle die 7 and the top surface of the front part of the lower die 2 form the first layer of extrusion channel, the extrusion channel is formed between the adjacent middle dies 7, the upper die 1 and the front top surface of the nth middle die 7 form the n+1 layer of extrusion channel, and the lower die 2 and the front top surface of all the middle dies 7 are provided with the circular arc guide area 8.

[0023] After the middle die 7 is arranged between the upper die 1 and the lower die 2, the lower die 2 and each middle die 7 independently enters the raw material, which can be the same raw material or different raw materials, and the raw material is extruded from the extrusion channel and uniformly flows downward under the action of gravity to form a multi-layer structure stacked upward and downward, the number of stacked layers is determined by the number of middle dies 7, and finally flows out from the front side of the lower die 2 under the action of gravity and uniformly drops on the substrate on the surface of the roller 6 to perform coating, and the dropping speed and the speed of the roller 6 are adjusted according to actual needs.

[0024] The above is only the preferred embodiment of the present application, and does not limit the application in any form, and any simple modification, equivalent change or modification made according to the technical principle of the present application to the above embodiment still belongs to the scope of the technical solution of the present application.

Claims

1. A curtain coating die characterized by: The utility model provides a die head, including the upper die (1) and lower die (2) of front end upwardly inclined arrangement, the upper die (1) and lower die (2) back are connected as a whole through locking screw (3), the left and right sides of upper die (1) and lower die (2) are provided with left side plate subassembly (4) and right side plate subassembly (5) respectively, the rear side of lower die (2) is provided with feeding port (21), the top surface middle region of lower die (2) is provided with one -level buffer chamber (22) along the width direction, one -level buffer chamber (22) bottom is connected through feeding channel (23) and feeding port (21) and communicates, the top surface of lower die (2) is opened in one -level buffer chamber (22) front side extrusion channel (24), the top surface of lower die (2) is located one -level buffer chamber (22) front side and is provided with two -level buffer chamber (25) along the width direction, the bottom surface of lower die (2) front side extends downward and forms arc guiding portion (26), raw material enters after feeding port (21) and enters extrusion channel (24) after buffering through one -level buffer chamber (22), and then evenly extrudes after buffering through two -level buffer chamber (25), and evenly flows down along lower die (2) front side and evenly drops and coats on the substrate on the surface of roll (6) through arc guiding portion (26).

2. A curtain coating die according to claim 1, characterized in that: The depth and width of the one -level buffer chamber (22) are greater than the depth and width of the two -level buffer chamber (25).

3. A curtain coater die according to claim 1, characterized in that: The feeding port (21) is located in the middle of the rear side of the lower die (2).

4. A curtain coater die according to claim 1, characterized in that: The upper die (1) and the lower die (2) are provided with a middle die (7) therebetween, and the three are locked as a whole by the locking screw (3), the bottom surface of the middle die (7) corresponds to the bottom surface of the upper die (1), and the top surface of the middle die (7) is provided with an extrusion channel, a one -level buffer chamber (22), and a two -level buffer chamber (25) at a position corresponding to the top surface of the lower die (2), the middle die (7) is provided with a feeding port (21) and a feeding channel (23) corresponding to the lower die (2), the bottom surface of the middle die (7) and the top surface of the front part of the lower die (2) form a first layer of extrusion channels, the upper die (1) and the top surface of the front part of the middle die (7) form a second layer of extrusion channels, and the top surfaces of the front sides of the lower die (2) and the middle die (7) are provided with a circular arc guiding area (8).

5. A curtain coater die according to claim 1, characterized in that: The upper die (1) and the lower die (2) are provided with n middle dies (7) stacked from bottom to top therebetween, 10 >= n >= 2, the die head is locked as a whole by the locking screw (3), the bottom surface of the middle die (7) corresponds to the bottom surface of the upper die (1), the top surface of the middle die (7) is provided with an extrusion channel, a one -level buffer chamber (22), and a two -level buffer chamber (25) at a position corresponding to the top surface of the lower die (2), the middle die (7) is provided with a feeding port (21) and a feeding channel (23) corresponding to the lower die (2), the bottom surface of the lowermost middle die (7) and the top surface of the front part of the lower die (2) form a first layer of extrusion channels, extrusion channels are formed between adjacent middle dies (7) above and below, the upper die (1) and the top surface of the front part of the nth middle die (7) form an (n+1)th layer of extrusion channels, and the top surfaces of the front sides of the lower die (2) and all the middle dies (7) are provided with a circular arc guiding area (8).

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