CN219191226U

CN219191226U - BOPET melt filter

Info

Publication number: CN219191226U
Application number: CN202320141296.3U
Authority: CN
Inventors: 孙红刚; 李国磊
Original assignee: Kanghui New Material Technology Co Ltd
Current assignee: Kanghui New Material Technology Co Ltd
Priority date: 2023-02-03
Filing date: 2023-02-03
Publication date: 2023-06-16
Anticipated expiration: 2033-02-03

Abstract

The utility model relates to the technical field of polyester films, in particular to a BOPET melt filter, which comprises a filter shell, a disc, a filter core tube, an outer runner, an upper runner and a lower runner, wherein the filter shell is of a cavity structure, the disc and the filter core tube are both arranged in the cavity of the filter shell, and the upper runner is communicated with the output end of the filter core tube; the cavity of the filter shell is 45% -55% of the height of the filter shell, the outer flow channel is arranged on the outer surface of the filter core tube along the length direction of the filter core tube and used for flowing melt, and the lower flow channel is communicated with the input end of the outer flow channel. The BOPET melt filter aims to solve the problems that the residence time of an extruded melt in the melt filter is too long, so that a fibrous substance and a gel point appear in the film drawing process.

Description

BOPET melt filter

Technical Field

The utility model relates to the technical field of polyester films, in particular to a BOPET melt filter.

Background

Biaxially oriented polyester film (BOPET, biaxially Oriented Polyester Film) is widely used in packaging, medicine and electronics fields due to its excellent mechanical properties and dimensional stability during use, good weather resistance and corrosion resistance. The demand of BOPET is rapidly increased, the quality requirement on the ultrathin film is higher and higher, the quality of the base film cannot meet the requirement, and the quality of downstream products can be influenced.

The filtering procedure of the extrusion melt in the extrusion stage mainly adopts a disc type melt filter, and different requirements are met on the retention time and the filtering amount of the extrusion melt in the filter due to different production requirements in the actual production process.

At present, the method for reducing the problems of retention time, fiber-like substances, gel points and the like in the industry without changing the height of the inlet and the outlet of the filter comprises the following steps: without changing the filter, dummy disks are added during installation, reducing the number of disks filtered to achieve an increase in melt flow rate within the filter.

The defects in the existing production process are that: the filter area of the filter is reduced in the practical application process, and the dead angle of the disc in the filter is increased due to the installation of the pseudo disc, so that the retention point of melt in the filter is increased, local high temperature is easy to form in the filter, and problems occur in production.

Accordingly, the inventors provide a BOPET melt filter.

Disclosure of Invention

(1) Technical problem to be solved

The embodiment of the utility model provides a BOPET melt filter, which solves the technical problem that fiber and gel point appear in the film drawing process due to overlong residence time of an extruded melt in the melt filter.

(2) Technical proposal

The utility model provides a BOPET melt filter, which comprises a filter shell, a disc, a filter core tube, an outer runner, an upper runner and a lower runner, wherein the filter shell is of a cavity structure, the disc and the filter core tube are both arranged in the cavity of the filter shell, and the upper runner is communicated with the output end of the filter core tube; wherein,,

the cavity of the filter shell is 45% -55% of the height of the filter shell, the outer runner is arranged on the outer surface of the filter core tube along the length direction of the filter core tube and used for flowing melt, and the lower runner is communicated with the input end of the outer runner.

Optionally, the depth of the outer flow channel increases gradually along the flow direction of the melt.

Optionally, a plurality of the outer flow channels are uniformly distributed at intervals in sequence along the circumference of the filter core tube.

Optionally, the roughness Ra of the inner surface of the upper runner and/or the lower runner is less than 0.05.

Optionally, the corners of the upper runner and/or the lower runner are large arc corners.

Optionally, the disc is sleeved on the filter core tube, and an output end of the disc is communicated with the outer flow channel.

Optionally, the discs are layered in sequence along the length direction of the filter core tube.

Optionally, a spacer is disposed between two adjacent discs.

(3) Advantageous effects

In summary, the utility model reduces the length of the cavity and the filter core tube by changing the internal structure of the filter to reduce the filtering area, and simultaneously changes the inner flow passage of the melt in the filter into the outer flow passage, thereby finally solving the problems of fibrous matters, gel points and the like caused by overlong residence time of the extruded melt in the melt filter in the film drawing process.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments of the present utility model will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

FIG. 1 is a schematic diagram of a BOPET melt filter according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of an outer runner in a BOPET melt filter according to an embodiment of the present utility model.

In the figure:

1-a filter housing; 2-disc; 3-a filter core tube; 4-an outer flow channel; 5-upper flow channel; 6-lower flow channel.

Detailed Description

Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the utility model and are not intended to limit the scope of the utility model, i.e., the utility model is not limited to the embodiments described, but covers any modifications, substitutions and improvements in parts, components and connections without departing from the spirit of the utility model.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the product of the present utility model is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present utility model.

In the description of the present utility model, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed" and "mounted" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

FIG. 1 is a schematic diagram of a BOPET melt filter according to an embodiment of the present utility model, as shown in FIGS. 1-2, the filter may include a filter housing 1, a disc 2, a filter core tube 3, an outer flow path 4, an upper flow path 5 and a lower flow path 6, the filter housing 1 is a cavity structure, the disc 2 and the filter core tube 3 are both installed in the cavity of the filter housing 1, and the upper flow path 5 is connected to an output end of the filter core tube 3; the height of the cavity of the filter housing 1 is 45% -55% of the height of the filter housing 1, the outer flow channel 4 is arranged on the outer surface of the filter core tube 3 along the length direction of the filter core tube and used for flowing melt, and the lower flow channel 6 is communicated with the input end of the outer flow channel 4.

In the above embodiment, the melt filter is mainly composed of three parts, namely, the filter housing 1, the disc 2, and the filter core tube 3. Wherein, the filter housing 1 is a cavity structure, and the empty cavity after reducing the number of discs 2 installed in the filter is integrally forged by forging stainless steel materials, and a flow passage with proper size is arranged in the center. The flow direction of the melt in the filter is from the lower runner 6, the melt is filtered by the disc 2 and then enters the outer runner 4, and finally flows out of the filter through the upper runner 5.

The disc 2 in the filter can be arranged according to different use conditions, and the discs with different precision can be arranged to better filter impurities, fibrous matters, gel and the like entrained in the extrusion melt.

The volume of the inner cavity of the filter is reduced (the inner cavity is approximately compressed to be half of the original volume), and under the condition of the compression ratio, the filtering quantity of the melt can be ensured, and the melt can flow out quickly, so that the filtering time is shortened. In order to ensure the extrusion quantity of the whole filter, the original inner runner core column cannot ensure the quick outflow of the melt due to the small gap between the disc and the core tube, so that the flow mode of the melt in the core tube in the filter is changed from the inner runner to the outer runner so as to increase the gap between the disc and the core tube, and the quick outflow of the melt is facilitated.

The filter reduces the internal volume of the filter by using an integral forging mode at the lower part of the filter on the basis of ensuring the unchanged height of the melt inlet and outlet of the filter, and simultaneously changes the filter element structure of the filter (changes an inner runner into an outer runner) to ensure that the melt increases the flow of the melt under the same pressure, thereby reducing the residence time and residence dead angle of the melt.

As an alternative embodiment, the depth of the outer flow channel 4 increases gradually in the flow direction of the melt. Among other things, such an arrangement ensures that the melt is rapidly forced out of the outer flow channel 4 to reduce the residence time of the melt within the filter.

As an alternative embodiment, the plurality of outer flow channels 4 are arranged uniformly at intervals in sequence along the circumferential direction of the filter core tube 3. Specifically, six outer flow channels 4 are formed in the circumferential direction of the filter core tube 3, so that a large amount of melt can flow through the filter core tube 3 rapidly, and the filtering speed is increased.

As an alternative embodiment, the roughness Ra of the inner surface of the upper flow channel 5 and/or the lower flow channel 6 is less than 0.05. The smaller the roughness, the smoother the inner surfaces of the upper runner 5 and the lower runner 6, and the more favorable the flow of the melt in the upper runner 5 and the lower runner 6. But not limited thereto, the roughness Ra of the inner surface of the filter core tube 3 and the inner cavity surface of the filter housing 1 is also less than 0.05, thereby reducing the residence time of the melt flowing through the entire filter.

As an alternative embodiment, as shown in fig. 1, the corners of the upper flow channel 5 and/or the lower flow channel 6 are large arc corners. Wherein the design of the upper runner 5 and the lower runner 6 ensures that the melt flows out of the filter quickly.

As an alternative embodiment, as shown in fig. 1, the disc 2 is sleeved on the filter core tube 3, and the output end of the disc 2 is communicated with the outer flow channel 4. Wherein, disc 2 is hollow discoid, cup joints it in filter core tube 3, and the clearance between the two is very little to the output port of disc 2 can communicate with the outer runner 4 that sets up on filter core tube 3, is in order to filter the fuse-element through the setting of the independent disc 2 of multilayer, sets up the round with it along the circumference of filter core tube 3 and can filter the fuse-element that all directions flow, and then can improve the filtration efficiency of fuse-element.

As an alternative embodiment, as shown in fig. 1, a plurality of discs 2 are layered in sequence along the length direction of the filter core tube 3. Wherein the arrangement of a plurality of discs 2 in the flow direction of the melt can further improve the filtering efficiency of the melt.

As an alternative embodiment, as shown in fig. 1, a spacer is provided between two adjacent discs 2. Specifically, the gap between the adjacent discs 2 can be ensured by providing gaskets of different thickness, so that the melt fills the whole filter.

It should be understood that, in the present specification, each embodiment is described in an incremental manner, and the same or similar parts between the embodiments are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. The utility model is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known method techniques is omitted here for the sake of brevity.

The foregoing is merely an example of the present application and is not limited to the present application. Various modifications and alterations of this application will become apparent to those skilled in the art without departing from the scope of this utility model. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims

1. The BOPET melt filter is characterized by comprising a filter shell (1), a disc (2), a filter core tube (3), an outer runner (4), an upper runner (5) and a lower runner (6), wherein the filter shell (1) is of a cavity structure, the disc (2) and the filter core tube (3) are both arranged in the cavity of the filter shell (1), and the upper runner (5) is communicated with the output end of the filter core tube (3); wherein,,

the height of the cavity of the filter shell (1) is 45% -55% of the height of the filter shell (1), the outer runner (4) is arranged on the outer surface of the filter core tube (3) along the length direction of the filter core tube and used for flowing of melt, and the lower runner (6) is communicated with the input end of the outer runner (4).

2. BOPET melt filter according to claim 1, wherein the depth of the outer flow channel (4) increases gradually in the flow direction of the melt.

3. BOPET melt filter according to any one of claims 1-2, wherein a plurality of the outer flow channels (4) are evenly arranged at sequential intervals in the circumferential direction of the filter core tube (3).

4. BOPET melt filter according to claim 1, wherein the roughness Ra of the inner surface of the upper runner (5) and/or the lower runner (6) is less than 0.05.

5. BOPET melt filter according to claim 1, wherein the corners of the upper runner (5) and/or the lower runner (6) are large arc corners.

6. BOPET melt filter according to claim 1, characterized in that the disc (2) is sleeved to the filter core tube (3) and the output end of the disc (2) communicates with the outer flow channel (4).

7. BOPET melt filter according to claim 6, wherein a plurality of the discs (2) are layered in sequence along the length of the filter core tube (3).

8. BOPET melt filter according to claim 7, characterised in that a gasket is provided between two adjacent discs (2).