Laminating die head for processing laminated paper

Abstract

The utility model relates to a laminating die head for processing laminated paper. The extrusion die comprises a first die, a second die and an extrusion cavity defined between the first die and the second die, the extrusion cavity sequentially comprises an injection end, a first-stage expansion cavity, a second-stage expansion cavity, a pressure stabilizing cavity and an extrusion cavity, the injection end is located in the middle area of the upper side of a die head, and the first-stage expansion cavity communicates with the bottom of the injection end and extends towards the two sides with the injection end as the symmetric center; the second-stage expansion cavity is communicated with the bottom of the first-stage expansion cavity and symmetrically extends towards the two sides; the widths of the pressure stabilizing cavity and the extrusion cavity are consistent with those of the second-stage expansion cavity; a flow limiting rod and an elastic device are arranged in the lower side area of the pressure stabilizing cavity, the bottom face of the flow limiting rod is in an arc shape, the bottom outline of the pressure stabilizing cavity is matched with the bottom face of the flow limiting rod, a flow limiting groove is formed between the pressure stabilizing cavity and the flow limiting rod, and when the pressure intensity of the upper side of the flow limiting rod is increased, the flow limiting rod is squeezed downwards, and the flow limiting groove is narrowed; and when the pressure on the upper side of the flow limiting rod is reduced, the elastic device can drive the flow limiting rod to rebound and widen the flow limiting groove again.

Description

Technical Field

[0001] The utility model relates to a laminating device, in particular to a laminating die head for laminating paper processing. Background Art

[0002] The laminating die is a key component in the process of forming plastic film materials. The die consists of a first die and a second die. The first die lip of the first die and the second die lip of the second die form a die opening, and the raw material is extruded from the die opening. Whether the raw material can continuously and evenly output a coating of equal thickness from the die opening is the main entry point for evaluating the performance of the laminating die. The fluid raw material in the laminating die comes from the injection component and is injected from the injection port of the laminating die. The existing laminating die can evenly distribute the fluid injected from the injection port into long strips through its internal cavity design. However, the injection component may cause the injection pressure to fluctuate due to failure or other reasons during operation, and the existing laminating die cannot cope with this situation. This will cause the coating output rate to fluctuate at the moment of pressure fluctuation, while the spraying speed will not change, which will cause the thickness of some coatings to change, affecting the quality of the product. Summary of the invention

[0003] The utility model provides a laminating die head for laminating paper processing, which solves the problem in the prior art that injection pressure fluctuation affects the laminating quality.

[0004] The above technical problems of the utility model are mainly solved by the following technical solutions: a laminating die head for laminating paper processing, comprising a first die, a second die and an extrusion cavity defined between the two, the extrusion cavity sequentially comprising an injection end, a primary expansion cavity, a secondary expansion cavity, a pressure stabilizing cavity and an extrusion cavity, the injection end is located in the middle area of ​​the upper side of the die head, the primary expansion cavity is interconnected with the bottom of the injection end and is extended to both sides with the injection end as the symmetrical center, the secondary expansion cavity is interconnected with the bottom of the primary expansion cavity and is also symmetrically extended to both sides The side extension is arranged, the width of the pressure-stabilizing chamber and the extrusion chamber is consistent with the secondary expansion chamber; the lower area of ​​the pressure-stabilizing chamber is provided with a flow-limiting rod and an elastic device, the bottom surface of the flow-limiting rod is arc-shaped, the bottom contour of the pressure-stabilizing chamber is adapted to the bottom surface of the flow-limiting rod, and a limited flow groove is formed between the two, when the pressure on the upper side of the flow-limiting rod increases, the flow-limiting rod is squeezed downward and the flow-limiting groove becomes narrower; when the pressure on the upper side of the flow-limiting rod decreases, the elastic device will drive the flow-limiting rod to rebound and make the flow-limiting groove wider again.

[0005] The coating enters the extrusion chamber of the utility model from the injection end, and is extended for the first time in the primary expansion chamber, and then enters the secondary expansion chamber for the second extension. At this time, the coating is extended to a predetermined width, and the coating continues to flow to the pressure stabilizing chamber. After the coating passes through the flow limiting groove, it is finally extruded from the extrusion chamber. The characteristic of the utility model is that once the pressure of the coating fluctuates, the pressure fluctuation will affect the pressure stabilizing chamber. Under normal circumstances, the hydraulic pressure on the upper side of the pressure stabilizing chamber is slightly higher than the hydraulic pressure on the lower side, so that the hydraulic pressure difference can drive the coating to flow. When the pressure on the upper side of the flow limiting rod suddenly increases, the hydraulic pressure difference will drive the flow limiting rod to squeeze downward and narrow the flow limiting groove, and cause the elastic device to deform elastically. Due to the narrowing of the flow limiting groove and the increase of the hydraulic pressure, the actual coating output rate does not change significantly; when the pressure on the upper side of the flow limiting rod decreases, the elastic device will drive the flow limiting rod to rebound and make the flow limiting groove widen again. Therefore, the utility model has adaptive characteristics, which can minimize the impact of hydraulic pressure fluctuations and basically does not affect the quality of the spraying.

[0006] Furthermore, a first slit strip is provided in the first-stage expansion chamber, and a second slit strip is provided in the second-stage expansion chamber. The passable width of the two slit strips is much narrower than the average width of the expansion chamber, so the paint will encounter a certain resistance when entering the two slit strips, which will change the flow priority of the paint to flow to both sides.

[0007] Furthermore, the lateral width of the two slits is set to gradually narrow from the middle to the sides. The wider the slit is, the greater its flow resistance is. Therefore, this design is also to allow the coating in the middle area of ​​the two expansion cavities to flow to the sides first, thereby improving the uniformity of the spraying of the utility model.

[0008] Furthermore, the cross sections of the two slit strips are both bent.

[0009] Furthermore, a first buffer cavity is provided in the primary expansion cavity and located on the upper side of the first slit belt, and a second buffer cavity is provided in the secondary expansion cavity and located on the upper side of the second slit belt.

[0010] Furthermore, a mounting groove is provided between the pressure stabilizing cavity and the extrusion cavity, and the elastic device is provided in the mounting groove.

[0011] Therefore, compared with the prior art, the utility model has the following characteristics: 1. When the pressure on the upper side of the limiting rod suddenly increases, the hydraulic difference will drive the limiting rod to squeeze downward and narrow the limiting groove, and cause the elastic device to elastically deform. Since the limiting groove becomes narrower and the hydraulic pressure increases, the actual coating output rate does not change significantly. When the pressure on the upper side of the limiting rod decreases, the elastic device will drive the limiting rod to rebound and widen the limiting groove again. Therefore, the utility model has adaptive characteristics, which can minimize the impact of hydraulic fluctuations and basically does not affect the spray quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 It is a cross-sectional view of the utility model cut along the thickness direction of the extrusion cavity;

[0013] Attached Figure 2 It is a cross-sectional view of the utility model cut along the width direction of the extrusion cavity. DETAILED DESCRIPTION

[0014] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0015] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0016] Example 1: See Figure 1 and Figure 2A coating die head for coating paper processing, comprising a first die 100, a second die 200 and an extrusion cavity defined therebetween, the extrusion cavity sequentially comprising an injection end 310, a primary expansion cavity 320, a secondary expansion cavity 330, a pressure stabilizing cavity 340 and an extrusion cavity 350, the injection end is located in the middle area of ​​the upper side of the die head, the primary expansion cavity is interconnected with the bottom of the injection end and is extended to both sides with the injection end as the symmetrical center, the secondary expansion cavity is interconnected with the bottom of the primary expansion cavity and is also symmetrically extended to both sides The two sides are extended, and the width of the pressure-stabilizing chamber and the extrusion chamber is consistent with that of the secondary expansion chamber; the lower area of ​​the pressure-stabilizing chamber is provided with a flow-limiting rod 360 and an elastic device 370, the bottom surface of the flow-limiting rod is arc-shaped, the bottom contour of the pressure-stabilizing chamber is adapted to the bottom surface of the flow-limiting rod, and a limited flow groove 341 is formed between the two, when the pressure on the upper side of the flow-limiting rod increases, the flow-limiting rod is squeezed downward and the flow-limiting groove becomes narrower; when the pressure on the upper side of the flow-limiting rod decreases, the elastic device will drive the flow-limiting rod to rebound and make the flow-limiting groove wider again.

[0017] The coating enters the extrusion chamber of this embodiment from the injection end, and is extended for the first time in the primary expansion chamber, and then enters the secondary expansion chamber for the second extension. At this time, the coating is extended to a predetermined width, and the coating continues to flow to the pressure stabilizing chamber. After the coating passes through the flow limiting groove, it is finally extruded from the extrusion chamber. The characteristic of this embodiment is that once the pressure of the coating fluctuates, the pressure fluctuation will affect the pressure stabilizing chamber. Under normal circumstances, the hydraulic pressure on the upper side of the pressure stabilizing chamber is slightly higher than the hydraulic pressure on the lower side, so that the hydraulic pressure difference can drive the coating to flow. When the pressure on the upper side of the flow limiting rod suddenly increases, the hydraulic pressure difference will drive the flow limiting rod to squeeze downward and narrow the flow limiting groove, and cause the elastic device to deform elastically. Due to the narrowing of the flow limiting groove and the increase of the hydraulic pressure, the actual coating output rate does not change significantly; when the pressure on the upper side of the flow limiting rod decreases, the elastic device will drive the flow limiting rod to rebound and make the flow limiting groove widen again. Therefore, this embodiment has an adaptive feature, which can minimize the impact of hydraulic pressure fluctuations and basically does not affect the quality of the spraying.

[0018] See Figure 1 The first expansion chamber is provided with a first slit strip 321, and the second expansion chamber is provided with a second slit strip 331. The passable width of the two slit strips is much narrower than the average width of the expansion chamber, so the paint will encounter a certain resistance when entering the two slit strips, which will change the flow priority of the paint to flow to both sides.

[0019] See Figure 2 The lateral width of the two slits is set to gradually narrow from the middle to the sides. The larger the width of the slit, the greater the flow resistance. Therefore, this design is also to allow the coating in the middle area of ​​the two expansion chambers to flow to the sides first, thereby improving the uniformity of the spraying in this embodiment.

[0020] See Figure 1The cross sections of the two slit belts are bent, which can further increase the resistance of the slit belts.

[0021] See Figure 1 A first buffer chamber 322 is provided in the primary expansion chamber and located on the upper side of the first slit band, and a second buffer chamber 332 is provided in the secondary expansion chamber and located on the upper side of the second slit band. The two buffer chambers are much wider than the average width of the expansion chamber, and the flow resistance of the coating in the buffer chamber is very low. This design is also to allow the coating in the middle area of ​​the two expansion chambers to flow to both sides first.

[0022] See Figure 1 A mounting groove 371 is provided between the pressure stabilizing chamber and the extrusion chamber, and the elastic device is arranged in the mounting groove.

[0023] It is obvious to those skilled in the art that the utility model can be changed in many ways, and such changes are not considered to be out of the scope of the utility model. All such modifications obvious to those skilled in the art will be included in the scope of the claims.

Claims

1. A laminating die head for laminating paper processing, comprising a first die, a second die and an extrusion cavity defined therebetween, characterized in that: The extrusion chamber comprises an injection end, a primary expansion chamber, a secondary expansion chamber, a pressure stabilizing chamber and an extrusion chamber in sequence, the injection end is located in the middle area of ​​the upper side of the die head, the primary expansion chamber is interconnected with the bottom of the injection end and is extended to both sides with the injection end as the symmetrical center, the secondary expansion chamber is interconnected with the bottom of the primary expansion chamber and is also symmetrically extended to both sides, the width of the pressure stabilizing chamber and the extrusion chamber is consistent with that of the secondary expansion chamber; a flow limiting rod and an elastic device are provided in the lower area of ​​the pressure stabilizing chamber, the bottom surface of the flow limiting rod is arc-shaped, the bottom contour of the pressure stabilizing chamber is adapted to the bottom surface of the flow limiting rod, and a limited flow groove is formed between the two, when the pressure on the upper side of the flow limiting rod increases, the flow limiting rod is squeezed downward and the flow limiting groove becomes narrower; when the pressure on the upper side of the flow limiting rod decreases, the elastic device drives the flow limiting rod to rebound and makes the flow limiting groove widen again.

2. The laminating die head for laminating paper processing according to claim 1, characterized in that: A first slit belt is arranged in the primary expansion cavity, and a second slit belt is arranged in the secondary expansion cavity.

3. The laminating die head for laminating paper processing according to claim 2, characterized in that: The lateral width of the two slits is set to gradually narrow from the middle to both sides.

4. The laminating die head for laminating paper processing according to claim 3, characterized in that: The cross sections of the two slit strips are both bent.

5. The laminating die head for laminating paper processing according to claim 4, characterized in that: A first buffer cavity is provided in the primary expansion cavity and located on the upper side of the first slit belt, and a second buffer cavity is provided in the secondary expansion cavity and located on the upper side of the second slit belt.

6. The laminating die head for laminating paper processing according to claim 1, characterized in that: A mounting groove is provided between the pressure stabilizing cavity and the extrusion cavity, and the elastic device is arranged in the mounting groove.

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