BOPET (Biaxially Oriented Polyethylene Terephthalate) die head with special lip structure

Abstract

The utility model discloses a BOPET (Biaxially Oriented Polyethylene Terephthalate) die head with a special lip structure, which comprises an automatic adjusting assembly, an upper die body is arranged on one side of the automatic adjusting assembly, a middle die body I is arranged on one side of the upper die body, a middle die body II is arranged on one side of the middle die body I, a lower die body is arranged on one side of the middle die body II, and a lower die body is arranged on one side of the lower die body. A flow channel is formed in the lower die body, a die lip is arranged at the terminal end of the flow channel, a displacement assembly is arranged in the lower die body and comprises a movable plate, the movable plate is installed in the lower lip and is an L-shaped plate, a plurality of sawtooth grooves are evenly formed in one side of the movable plate, a motor is installed in the lower die body, and the motor is connected with the lower die body. The size of the lip gap is accurately adjusted through the arranged displacement assembly, so that the thickness of the produced two-way stretch polyester film is efficiently controlled, different production requirements are met, and the two-way stretch polyester film thickness adjusting device has the advantages of being high in practicability and convenient and fast to adjust and control.

Description

Technical Field

[0001] The utility model relates to the technical field of polyester film processing, in particular to a BOPET die head with a special lip structure. Background Art

[0002] In the pursuit of precision manufacturing of high-performance film materials, technological innovation has always been the key to promoting industry progress. BOPET film is a polyester film material made through drying, extrusion, biaxial stretching and other steps. It has high strength and rigidity, and shows good resistance to most chemicals. It has strong chemical corrosion resistance, low water absorption and good water resistance. Therefore, it is widely used in the packaging industry, electronics and electrical industries, solar energy and photovoltaic industries, etc., and the application areas of BOPET film are still expanding.

[0003] The existing die lip structure design has certain defects, resulting in inaccurate melt flow control, which in turn affects the thickness distribution uniformity of the film, reduces production efficiency, and seriously wastes production raw materials. Therefore, it is necessary to design a BOPET die with a special lip structure that is highly practical and has high melt uniformity and stability. Utility Model Content

[0004] The purpose of the utility model is to provide a BOPET die head with a special lip structure to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a BOPET die head with a special lip structure, comprising an automatic adjustment component, wherein an upper mold body is installed above the automatic adjustment component, a middle mold body 1 is installed above the upper mold body, a middle mold body 2 is provided on one side of the middle mold body 1, a flow channel is opened between the middle mold body 1 and the middle mold body 2, and the structure of the flow channel is tapered, that is, the cross-section of the flow channel gradually decreases from the inlet to the outlet, forming a certain taper, the inlet of the flow channel is located between the middle mold body 1 and the middle mold body 2, and the outlet of the flow channel is located between the upper mold body and the lower mold body;

[0006] A lower mold body is installed below the middle mold body 2, a die lip is provided at the outlet of the flow channel, and a displacement component is provided inside the lower mold body.

[0007] According to the above technical solution, the die lip includes an upper lip and a lower lip, the upper lip is riveted to the upper die body, and the lower lip is riveted to the lower die body, and a coating is provided on the inner walls of the upper lip and the lower lip.

[0008] According to the above technical solution, a first roller is installed below the die lip, a second roller is installed on one side of the first roller, and the first roller and the second roller are installed on the frame through a bracket and a bearing system.

[0009] According to the above technical solution, the displacement assembly includes a movable plate, which is installed inside the lower mold body. The movable plate is an "L"-shaped plate. A number of serrated grooves are evenly opened on the inner plate body of the longer side of the movable plate, and the end of the longer side of the movable plate 111 is welded to the lower lip. A motor is installed inside the lower mold body, and the upper coupling of the motor is connected to a gear.

[0010] According to the above technical solution, the gear is meshed and connected with the sawtooth groove.

[0011] According to the above technical solution, a limiting plate is provided on one side of the serrated groove.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0013] (1) By providing a displacement component, the lip gap size can be efficiently controlled. The lip width can be adjusted automatically according to the required film width. In addition, in some cases where the change in film width during the subsequent stretching process of BOPET needs to be taken into account, precise control can be achieved, effectively meeting the production needs under different circumstances and greatly improving production efficiency.

[0014] (2) By providing a coating on the flow channel and the die lip, the friction characteristics between the material and the inner wall of the flow channel are effectively improved, adhesion is reduced, and the smoothness of the material flow is improved;

[0015] (3) By providing a tapered flow channel, the material gradually becomes thinner in the flow channel, which can reduce the flow resistance and improve the uniformity of the material, help guide the melt to be evenly distributed along the width direction, make the uniformity of the outlet speed more perfect, and improve the quality and consistency of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the overall cross-sectional structure of the utility model;

[0018] Figure 2 This utility model Figure 1 A magnified schematic diagram of point A in the middle;

[0019] In the figure: 1. Automatic adjustment component; 2. Upper mold body; 3. Middle mold body 1; 4. Runner; 5. Middle mold body 2; 6. Lower mold body; 7. Die lip; 71. Upper lip; 72. Lower lip; 8. First roller; 9. Second roller; 10. Coating; 11. Displacement component; 111. Moving plate; 112. Sawtooth groove; 113. Motor; 114. Gear. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-2 The utility model provides a technical solution: a BOPET die head with a special lip structure, comprising an automatic adjustment component 1, an upper mold body 2 is installed above the automatic adjustment component 1, a middle mold body 3 is installed above the upper mold body 2, a middle mold body 2 5 is riveted to one side of the middle mold body 3, a flow channel 4 is opened between the middle mold body 1 3 and the middle mold body 2 5, and the structure of the flow channel 4 is tapered, that is, the cross-section of the flow channel 4 gradually decreases from the inlet to the outlet, forming a certain taper, the inlet of the flow channel 4 is located between the middle mold body 1 3 and the middle mold body 2 5, and the outlet of the flow channel 4 is located between the upper mold body 2 and the lower mold body 6. When the film raw material flows through the flow channel 4, it is continuously accelerated during the flow process, thereby obtaining a higher flow rate at the die outlet, which is beneficial to subsequent processing or molding process.

[0022] like Figure 2 As shown, a lower mold body 6 is installed below the middle mold body 2 5, the middle mold body 1 3 and the middle mold body 2 5 are riveted between the upper mold body 2 and the lower mold body 6, a mold lip 7 is provided at the outlet of the flow channel 4, and a displacement component 11 is provided inside the lower mold body 6 for adjusting the gap of the mold lip 7.

[0023] like Figure 2 As shown, the die lip 7 includes an upper lip 71 and a lower lip 72. The upper lip 71 is riveted to the upper die body 2, and the lower lip 72 is riveted to the lower die body 6. The inner walls of the upper lip 71 and the lower lip 72 are both adsorbed and connected with a coating 10. The coating 10 runs through the inner wall of the entire flow channel 4 to the die lip 7, thereby ensuring that the BOPET raw material passing through the flow channel 4 can flow out smoothly after contacting the coating 10, greatly reducing the residue of raw material in the flow channel 4, thereby reducing the waste of raw materials, and at the same time reducing the occurrence of blockages, etc., and can also greatly improve production efficiency.

[0024] A first roller 8 is installed below the die lip 7, and a second roller 9 is installed on one side of the first roller 8. The first roller 8 and the second roller 9 are installed on the frame through a bracket and a bearing system. The extruded film is supported between the first roller 8 and the second roller 9. When the film is just extruded from the die head, it is in a very soft state and is easily deformed. Installing the first roller 8 and the second roller 9 below the die lip 7 can effectively prevent the film from wrinkling or deforming due to its own weight or air flow, and provide guidance according to the steering direction of the set first roller 8 and the second roller 9, guiding the film to advance along a predetermined path.

[0025] like Figure 2 As shown, the displacement assembly 11 includes a movable plate 111, which is installed inside the lower mold body 6. The movable plate 111 is an "L"-shaped plate. A number of serrated grooves 112 are evenly opened on the inner plate of the longer side of the movable plate 111, and the end of the longer side of the movable plate 111 is welded to the lower lip 72. A motor 113 is installed inside the lower mold body 6, and a gear 114 is connected to the coupling on the motor 113. The gear 114 is meshed with the serrated groove 112. After the motor 113 is started, the gear 114 rotates and meshes with the serrated groove 112, thereby driving the serrated groove 112 to displace and then drive the lower lip 72 to be pushed out in the direction of the upper lip 71, so that it continues to approach the upper lip 71, thereby achieving the effect of adjusting the position of the lower lip 72. By designing the width of the serrated groove 112 and setting the parameters of the motor 113, the displacement distance of the displacement plate 111 can be precisely determined. This allows the displacement of the lower lip 72 to be controlled according to specific circumstances. This also controls the closing of the lower lip 72 with the upper lip 71. This ensures operator safety during mold replacement, die lip 7 position adjustment, or maintenance, and prevents damage to the die lip 7 during movement or disassembly. The displacement assembly 11 has a simple overall structure and is easy to operate, resulting in low maintenance costs.

[0026] A limiting plate is provided on one side of the serrated groove 112. When the gear 114 rotates, the serrated groove 112 will be displaced. When the serrated groove 112 is displaced to a position infinitely close to the lower lip 72 and the upper lip 71, the limiting plate achieves its limiting function, thereby preventing the displacement component 11 from malfunctioning and providing further protection for the reliability of the die head.

[0027] Working principle: After confirming the desired BOPET thickness, the PLC program controls the start of the motor 113, causing the gear 114 to rotate and engage with the serrated groove 112. The displacement of the serrated groove 112 drives the displacement of the movable plate 111, thereby changing the position of the lower lip 72 and adjusting the gap between the upper lip 71 and the lower lip 72. After adjusting to the appropriate size, the BOPET extruded by the extruder enters the die head and the flow channel 4. The coating 10 prevents the processed BOPET from adhering to the flow channel 4 and causing blockage and waste. The BOPET then passes through the die lip 7 to achieve molding. Finally, the first roller 8 and the second roller 9 achieve rapid cooling and support of the BOPET, thereby obtaining the finished BOPET.

[0028] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0029] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A BOPET die head with a special lip structure, comprising an automatic adjustment component (1), characterized in that: An upper mold body (2) is installed above the automatic adjustment component (1), a middle mold body (3) is installed above the upper mold body (2), a middle mold body (5) is provided on one side of the middle mold body (3), a flow channel (4) is provided between the middle mold body (3) and the middle mold body (5), and the structure of the flow channel (4) is a tapered type, that is, the cross section of the flow channel (4) gradually decreases from the inlet to the outlet, forming a certain taper, and the inlet of the flow channel (4) is located between the middle mold body (3) and the middle mold body (5); A lower mold body (6) is installed below the middle mold body (5), the outlet of the flow channel (4) is located between the upper mold body (2) and the lower mold body (6), a mold lip (7) is provided at the outlet of the flow channel (4), and a displacement component (11) is provided inside the lower mold body (6).

2. The BOPET die head with a special lip structure according to claim 1, characterized in that: The die lip (7) includes an upper lip (71) and a lower lip (72), wherein the upper lip (71) is riveted to the upper die body (2), and the lower lip (72) is riveted to the lower die body (6), and a coating (10) is provided on the inner walls of the upper lip (71) and the lower lip (72).

3. The BOPET die head with a special lip structure according to claim 2, characterized in that: A first roller (8) is installed below the die lip (7), a second roller (9) is installed on one side of the first roller (8), and the first roller (8) and the second roller (9) are installed on the frame through a bracket and a bearing system.

4. The BOPET die head with a special lip structure according to claim 3, characterized in that: The displacement assembly (11) includes a movable plate (111), which is installed inside the lower mold body (6). The movable plate (111) is an "L"-shaped plate. A plurality of sawtooth grooves (112) are evenly opened on the inner plate body of the longer side of the movable plate (111), and the end of the longer side of the movable plate (111) is welded to the lower lip (72). A motor (113) is installed inside the lower mold body (6), and a coupling on the motor (113) is connected to a gear (114).

5. The BOPET die head with a special lip structure according to claim 4, characterized in that: The gear (114) is meshedly connected with the sawtooth groove (112).

6. The BOPET die head with a special lip structure according to claim 5, characterized in that: A limiting plate is provided on one side of the sawtooth groove (112).

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