Casting non-crystalline point filter

Abstract

The present invention discloses a cast-film crystal-free filter, which aims to solve the problem that most filters on the market use filter meshes for filtration, and the filtration effect is determined by the number and mesh size of the filter meshes, which has certain limitations. The key points of its technical solution are: it includes a housing, each end of the housing is provided with an end cap, and the end caps are respectively provided with an inlet and an outlet, and the interior of the housing is provided with a high-efficiency filtration layer and a precision filtration layer in sequence from the inlet to the outlet. The present invention utilizes the high-efficiency filtration layer and the precision filtration layer to filter the melt step by step, thereby ensuring that impurities in the outflowing melt are fully removed, thereby improving the filtration effect and reducing crystal points on the surface of the finished product.

Description

Technical Field

[0001] The present invention relates to the technical field of filters, and more particularly to a cast crystal-free filter. Background Art

[0002] Cast film is a non-stretched, non-directional flat extruded film produced by quenching the melt. There are two types of cast film: single-layer cast film and multi-layer co-extrusion cast film.

[0003] The production process of cast film generally involves the following steps: the raw material is first plasticized and melted in an extruder, then extruded through a T-shaped die and cast in a sheet onto the surface of a steadily rotating cooling roller. The film is cooled and shaped on the cooling roller, and then pulled and trimmed before being wound up. During this process, a filter is usually installed at the junction of the extruder and the die head to filter the melt and reduce the surface crystallinity of the finished product. Most filters on the market use filter mesh. The filtering effect is determined by the number and mesh size of the filter mesh, which has certain limitations.

[0004] Therefore, a new solution needs to be proposed to solve this problem. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a cast crystal-free filter to solve the technical problems raised in the above background technology.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a cast crystal-free filter, comprising a shell, both ends of which are provided with end covers, and the end covers are respectively provided with an inlet and an outlet, and the interior of the shell is provided with a high-efficiency filtration layer and a precision filtration layer in sequence from the inlet along the outlet.

[0007] The present invention is further configured as follows: the high-efficiency filtration layer includes a mounting seat arranged in the shell and a first seal, a second seal and a support layer arranged in the mounting seat, the surfaces of the first seal, the second seal and the support layer are respectively provided with a plurality of first through holes, second through holes and third through holes, a first porous structure layer is arranged between the first seal and the second seal, and a second porous structure layer is arranged between the second seal and the support layer, and the pore diameter of the first through hole, the pore diameter of the first porous structure layer, the pore diameter of the second through hole, the pore diameter of the second porous structure layer and the pore diameter of the third through hole decrease in sequence.

[0008] The present invention is further configured such that: the first porous structure layer is formed by stacking a plurality of first particles, and the particle sizes of the plurality of first particles are larger than the pore sizes of the first through holes and the second through holes.

[0009] The present invention is further configured such that: the second porous structure layer is formed by stacking a plurality of second particles, and the particle sizes of the plurality of second particles are larger than the pore sizes of the second through holes and the third through holes.

[0010] The present invention is further configured such that: the first particles and the second particles include at least one of metal particles and non-metal particles.

[0011] The present invention is further configured as follows: the first sealing member and the second sealing member each include a sealing ring and a connecting plate arranged in the sealing ring, and the first through holes and the second through holes are evenly distributed on the surface of the connecting plate.

[0012] The present invention is further configured as follows: the precision filtration layer includes a plurality of filter plates arranged in the shell, and the mesh sizes of the plurality of filter plates increase sequentially from the inlet toward the outlet.

[0013] The present invention is further configured such that gaps are formed between the first porous structure layer and the second sealing member, and between the second porous structure layer and the supporting layer.

[0014] In summary, the present invention has the following beneficial effects:

[0015] The melt is filtered step by step using high-efficiency filtration layers and precision filtration layers to ensure that impurities inside the outflowing melt are fully removed, thereby improving the filtration effect and reducing crystal points on the surface of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] In the figure: 1. Shell; 2. End cover; 3. Inlet; 4. Outlet; 5. Mounting seat; 6. First sealing member; 7. Second sealing member; 8. Support layer; 9. First porous structure layer; 10. Second porous structure layer; 11. Filter plate. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other unless there is a conflict.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0021] Casting non-crystalline point filter, such as Figure 1 As shown, it includes a shell 1, both ends of the shell 1 are provided with end covers 2, and the end covers 2 are respectively provided with an inlet 3 and an outlet 4, and the interior of the shell 1 is provided with a high-efficiency filter layer and a precision filter layer in sequence from the inlet 3 along the outlet 4;

[0022] The high-efficiency filtration layer includes a mounting seat 5 arranged in the housing 1 and a first seal 6, a second seal 7 and a support layer 8 arranged in the mounting seat 5. The surfaces of the first seal 6, the second seal 7 and the support layer 8 are respectively provided with a plurality of first through holes, second through holes and third through holes. A first porous structure layer 9 is provided between the first seal 6 and the second seal 7, and a second porous structure layer 10 is provided between the second seal 7 and the support layer 8. The pore size of the first through hole, the pore size of the first porous structure layer 9 and the pore size of the second through hole are , the pore size of the second porous structure layer 10, and the pore size of the third through hole decrease in sequence. In the process of the melt flowing from the inlet 3 into the high-efficiency filtration layer and flowing out of the high-efficiency filtration layer, the melt will pass through the first through hole, the first porous structure layer 9, the second through hole, the second porous structure layer 10, and the third through hole in sequence. Since the pore size of the first through hole, the pore size of the first porous structure layer 9, the pore size of the second through hole, the pore size of the second porous structure layer 10, and the pore size of the third through hole decrease in sequence, the melt will be filtered step by step, greatly reducing impurities;

[0023] The first porous structure layer 9 is formed by stacking a number of first particles, and the second porous structure layer 10 is formed by stacking a number of second particles. The first particles and the second particles include at least one of metal particles and non-metallic particles. The particle size of the first particles is larger than the aperture of the first through hole and the second through hole, and the particle size of the second particles is larger than the aperture of the second through hole and the third through hole. The gaps generated by the stacking of the first particles can be used to filter the melt passing through the first porous structure layer 9, thereby reducing impurities in the melt. Similarly, the gaps generated by the stacking of the second particles can be used to further filter the melt passing through the second porous structure layer 10, and the gaps generated by the stacking between the first particles and the second particles can extend the flow path of the melt, thereby further improving the filtering effect. At the same time, the particle size of the first particles is larger than the aperture of the first through hole and the second through hole, and the particle size of the second particles is larger than the aperture of the second through hole and the third through hole, which can prevent the first particles from falling out of the first seal 6 and the second seal 7, and the second particles from falling out of the second seal 7 and the support layer 8;

[0024] The precision filtration layer includes a plurality of filter discs 11 disposed in the housing 1. The mesh sizes of the filter discs 11 increase from the inlet 3 toward the outlet 4. By adjusting the number and mesh size of the filter discs 11 according to demand, the filtering effect on the melt can be further improved.

[0025] Gaps are formed between the first porous structure layer 9 and the second sealing member 7 and between the second porous structure layer 10 and the supporting layer 8, so that the melt can have a certain buffer space after filtration, thereby preventing the second sealing member 7 and the supporting layer 8 from being subjected to large forces and affecting their service life.

[0026] The principle of the present invention is as follows:

[0027] In the process of the melt entering the shell 1 from the inlet 3 and flowing out from the outlet 4, the melt will pass through the first through hole, the first porous structure layer 9, the second through hole, the second porous structure layer 10, and the third through hole in sequence, so as to achieve step-by-step filtration of the melt, thereby improving the filtration effect, and the first porous structure layer 9 and the second porous structure layer 10 are respectively composed of a stack of a plurality of first particles and a second particle. When the melt passes through, its flow path becomes longer, and the filtration effect is better. After the melt flows into the precision filtration layer, it is again filtered step by step through the multi-layer filter sheet 11 to ensure that the impurities in the melt can be fully filtered, thereby reducing the crystal points produced in the final product.

[0028] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A cast crystal-free filter, comprising a housing (1), characterized in that: Both ends of the shell (1) are provided with end covers (2), and the end covers (2) are respectively provided with an inlet (3) and an outlet (4), and the interior of the shell (1) is provided with a high-efficiency filter layer and a precision filter layer in sequence from the inlet (3) along the outlet (4); The high-efficiency filter layer comprises a mounting seat (5) arranged in the housing (1) and a first sealing member (6), a second sealing member (7) and a support layer (8) arranged in the mounting seat (5); the surfaces of the first sealing member (6), the second sealing member (7) and the support layer (8) are respectively provided with a plurality of first through holes, second through holes and third through holes; a first porous structure layer (9) is arranged between the first sealing member (6) and the second sealing member (7); a second porous structure layer (10) is arranged between the second sealing member (7) and the support layer (8); the pore diameters of the first through holes, the pore diameter of the first porous structure layer (9), the pore diameter of the second through holes, the pore diameter of the second porous structure layer (10) and the pore diameter of the third through holes decrease in sequence; The first porous structure layer (9) is formed by stacking a plurality of first particles, and the particle size of the plurality of first particles is larger than the pore size of the first through hole and the second through hole; The second porous structure layer (10) is formed by stacking a plurality of second particles, and the particle size of the plurality of second particles is larger than the pore size of the second through hole and the third through hole; Gaps are formed between the first porous structure layer (9) and the second sealing member (7), and between the second porous structure layer (10) and the supporting layer (8).

2. The cast crystal-free filter according to claim 1, characterized in that: The first particles and the second particles include at least one of metal particles and non-metal particles.

3. The cast crystal-free filter according to claim 1, characterized in that: The first sealing member (6) and the second sealing member (7) both comprise a sealing ring and a connecting plate arranged inside the sealing ring, and the first through holes and the second through holes are evenly distributed on the surface of the connecting plate.

4. The cast crystal-free filter according to claim 1, characterized in that: The precision filtration layer comprises a plurality of filter discs (11) arranged in the housing (1), and the mesh sizes of the plurality of filter discs (11) increase sequentially from the inlet (3) toward the outlet.

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