Porous filter

Abstract

The utility model relates to a smoking product, in particular to a porous filter, which comprises a coating layer extending along the axial direction, a filter main body extending along the axial direction is arranged in the coating layer, the filter main body comprises a first support section I, a second support section I and a third support section I, the cross section of the first supporting section I, the cross section of the second supporting section I and the cross section of the third supporting section I are each in a C shape, the two ends of the first supporting section I are connected with the second supporting section I and the third supporting section I respectively, openings of the first connecting section and the second connecting section are opposite, and a gap is formed between the bottoms of the first connecting section and the second connecting section. The free end of the second supporting section I and the free end of the third supporting section I are connected or make contact to form a movable first supporting structure, so that the first supporting section I, the second supporting section I and the third supporting section I are combined to form an integral channel, and according to the scheme, the cigarette holder is designed to be of a specific structure, the smoking experience of a user is improved, and meanwhile excessive deformation of the filter is effectively prevented.

Description

Technical Field

[0001] The utility model relates to a smoking product, in particular to a porous filter. Background Art

[0002] Usually cigarettes burn tobacco and generate a temperature that releases volatile compounds. The temperature in the burning tobacco can reach more than 800 degrees Celsius, and such high temperatures drive off many water contained in the smoke evolved from the tobacco. Other aerosol generation products that heat rather than burn aerosol-forming substrates (e.g., substrates containing tobacco) are also known in the art. The example of a system using an aerosol-generating product includes a system that heats a substrate containing tobacco between 200 degrees Celsius and 400 degrees Celsius to produce an aerosol. Regardless of the lower temperature of aerosol formation, compared with combustible smoking articles, due to higher moisture content, the aerosol stream generated by such a system can have a higher perceived temperature than conventional cigarette smoke.

[0003] Typically, aerosol generating articles include multiple elements assembled in the form of strips / tubes. The multiple elements typically include an aerosol-forming substrate and an aerosol-cooling element positioned in the strip at the downstream of the aerosol-forming substrate. The aerosol-cooling element may be alternatively referred to as a heat exchanger or a tubular filter element based on its functionality. They are typically positioned at the mouth end of a smoking article to define a cavity at the mouth end. They have many applications, including for conventional smoking articles containing tobacco and next generation products, such as smoking articles (heat-not-burn, HNB) in which tobacco is heated rather than burned. Its primary function is to provide the appearance and feel of a cigarette, and also to cool smoke to a temperature acceptable to consumers.

[0004] At present, tubular filter elements include non-hollow tubular filter elements and hollow filter elements (for example, the Chinese utility model application with patent application number 201980083579.3 discloses a machine for manufacturing tubular segments for the tobacco industry, which produces a hollow filter). Since the hollow filter element has a smaller suction resistance, the hollow tubular filter is more widely used. However, in the existing hollow filter elements, due to the limitations of the industrial preparation process, a large-sized circular through hole is usually formed in the middle of the tubular element, but due to the lack of structural support components in the middle, the hollow tubular filter element is easily deformed under the action of the user's mouth force, which leads to the emergence of problems such as difficulty in suction, affecting the user's suction experience.

[0005] Therefore, in order to improve the user's smoking experience, a hollow filter element with better supporting strength is urgently needed. Utility Model Content

[0006] The purpose of the utility model is to provide a porous filter to partially solve or alleviate the above-mentioned technical problems, so as to improve the user's suction experience and prevent the filter from being excessively deformed.

[0007] In order to solve the above-mentioned technical problems, the utility model specifically adopts the following technical solutions:

[0008] The first aspect of the utility model is to provide a porous filter, which includes: a coating layer extending in an axial direction, a filter body extending in an axial direction is arranged in the coating layer, and the filter body includes a first support segment I, a second support segment I and a third support segment I, the cross sections of the first support segment I, the second support segment I and the third support segment I are all C-shaped, the opening of the first support segment I faces the center of the coating layer, and the two ends of the first support segment I are respectively connected to the connecting end of the second support segment I and the connecting end of the third support segment I through a first connecting segment with a U-shaped cross section and a second connecting segment with a U-shaped cross section, the openings of the first connecting segment and the second connecting segment are opposite to each other and there is a gap between the bottoms; the second free end of the second support segment I and the third free end of the third support segment I are connected or contacted to form a movable first support structure, so that the first support segment I, the second support segment I, the third support segment I, the first connecting segment and the second connecting segment are combined to form an integral channel, and the first support segment I, the second support segment I and the third support segment I each form a triangle with the tangent point of the coating layer;

[0009] When the filter is squeezed under force, the bottoms of the first connecting section and the second connecting section approach each other to form a second supporting structure, and the first supporting structure moves toward the direction of the second supporting structure.

[0010] In some embodiments, the filter body also includes a fourth support segment I extending axially, the first end of the cross-section of the fourth support segment I abuts against the top of the first support segment I, the second end extends to between the second free end of the second support segment I and the third free end of the third support segment I, and finally abuts against the inner wall of the coating layer, when the filter is squeezed under force, the second free end of the second support segment I and the third free end of the third support segment I move along the fourth support segment I toward the direction of the second support structure.

[0011] In some embodiments, both sides of the second end of the cross section of the fourth support segment I extend in a direction close to the second support segment I and the third support segment I, respectively, to form a load-bearing segment.

[0012] In some embodiments, the curvature of the first support segment I is greater than the curvature of the second support segment I; and / or the curvature of the first support segment I is greater than the curvature of the third support segment I.

[0013] In some embodiments, the second support segment I and the third support segment I are symmetrically arranged.

[0014] In some embodiments, the cross-section of the fourth support segment I is S-shaped or straight.

[0015] In some embodiments, the first connecting segment includes a circular or arc-shaped head, and the two ends of the head are respectively connected to an arc segment, wherein the curvature of the arc segment is greater than the curvature of the head, and the curvature of the head is smaller than the curvature of the second supporting segment I. Of course, the curvature of the head is much smaller than the curvature of the first supporting segment I.

[0016] In some embodiments, a gap is left between the outer side walls of the first connecting section and the second connecting section and the fourth supporting section I; under external force, the first connecting section and the second connecting section respectively abut against two sides of the fourth supporting section I.

[0017] In some embodiments, the filter body has a thickness of 0.05 mm to 0.12 mm.

[0018] In some embodiments, the filter body is made of biodegradable filter material.

[0019] The second aspect of the utility model is to provide another porous filter comprising: an axially extending coating layer, wherein a filter body extending axially is arranged in the coating layer, wherein the filter body comprises a first support segment I, a second support segment I and a third support segment I, wherein the cross-sections of the first support segment I, the second support segment I and the third support segment I are all C-shaped, the opening of the first support segment faces the center of the coating layer, and the two ends of the first support segment I are respectively connected to the connecting end of the second support segment I and the connecting end of the third support segment I; the second free end of the second support segment I and the third free end of the third support segment I are connected or contacted to form a movable first support structure, so that the first support segment I, the second support segment I and the third support segment I are combined to form an integral channel, and the first support segment I, the second support segment I and the third support segment I each form a triangle with the tangent point of the coating layer; when the filter is squeezed under force, the parts of the first support segment I respectively connected to the second support segment I and the third support segment I are close to each other to form a second support structure, and the first support structure moves in the direction of the second support structure.

[0020] In some embodiments, the two ends of the first supporting segment I are respectively connected to the connecting end of the second supporting segment I and the connecting end of the third supporting segment I through a first connecting segment with a U-shaped cross-section and a second connecting segment with a U-shaped cross-section, and the openings of the first connecting segment and the second connecting segment are opposite to each other and there is a gap between the bottoms; when the filter is squeezed under force, the bottoms of the first connecting segment and the second connecting segment are close to each other to form a second supporting structure.

[0021] In some embodiments, the filter body also includes a fourth support segment I extending axially, the first end of the cross-section of the fourth support segment I abuts against the top of the first support segment I, the second end extends to between the second free end of the second support segment I and the third free end of the third support segment I, and finally abuts against the inner wall of the coating layer, when the filter is squeezed under force, the second free end of the second support segment I and the third free end of the third support segment I move along the fourth support segment I toward the direction of the second support structure.

[0022] In some embodiments, both sides of the second end of the cross section of the fourth support segment I extend in a direction close to the second support segment I and the third support segment I, respectively, to form a load-bearing segment.

[0023] In some embodiments, the curvature of the first support segment I is greater than the curvature of the second support segment I; and / or the curvature of the first support segment I is greater than the curvature of the third support segment I.

[0024] In some embodiments, the second support segment I and the third support segment I are symmetrically arranged.

[0025] In some embodiments, the cross-section of the fourth support segment I is S-shaped or straight.

[0026] In some embodiments, the first connecting segment includes a circular or arc-shaped head, and the two ends of the head are respectively connected to an arc segment, wherein the curvature of the arc segment is greater than the curvature of the head, and the curvature of the head is smaller than the curvature of the second supporting segment I. Of course, the curvature of the head is much smaller than the curvature of the first supporting segment I.

[0027] In some embodiments, a gap is left between the outer side walls of the first connecting section and the second connecting section and the fourth supporting section I; under external force, the first connecting section and the second connecting section respectively abut against two sides of the fourth supporting section I.

[0028] The third aspect of the utility model is to provide another porous filter, which includes: an axially extending coating layer, in which a filter body extending axially is arranged, the filter body includes at least three arc-shaped support segments, the at least three arc-shaped support segments include a first support segment I, a second support segment I and a third support segment I, the two ends of the first support segment I are respectively connected to the connecting end of the second support segment I and the connecting end of the third support segment I, the second free end of the second support segment I and the third free end of the third support segment I are connected or contacted to form a movable first support structure, so that the first support segment I, the second support segment I and the third support segment I are combined to form an integral channel; when the filter is squeezed under force, the first support segment I and the connected parts of the second support segment I and the third support segment I are respectively close to each other to form a second support structure, and the first support structure moves in the direction of the second support structure.

[0029] In some embodiments, the at least three arc-shaped support segments are distributed along the circumference of the cladding layer.

[0030] In some embodiments, the cross sections of the first support segment I, the second support segment I, and the third support segment I are all C-shaped, the opening of the first support segment I faces the center of the coating layer, and the two ends of the first support segment I are respectively connected to the connecting end of the second support segment I and the connecting end of the third support segment I through a first connecting segment with a U-shaped cross section and a second connecting segment with a U-shaped cross section, the openings of the first connecting segment and the second connecting segment are opposite to each other and there is a gap between the bottoms; and the tangent points of the first support segment I, the second support segment I, and the third support segment I with the coating layer form a triangle together;

[0031] When the filter is squeezed under force, the bottoms of the first connecting section and the second connecting section approach each other to form a second supporting structure, and the first supporting structure moves toward the direction of the second supporting structure.

[0032] In some embodiments, the filter body also includes a fourth support segment I extending axially, the first end of the cross-section of the fourth support segment I abuts against the top of the first support segment I, the second end extends to between the second free end of the second support segment I and the third free end of the third support segment I, and finally abuts against the inner wall of the coating layer, when the filter is squeezed under force, the second free end of the second support segment I and the third free end of the third support segment I move along the fourth support segment I toward the direction of the second support structure.

[0033] In some embodiments, both sides of the second end of the cross section of the fourth support segment I extend in a direction close to the second support segment I and the third support segment I, respectively, to form a load-bearing segment.

[0034] In some embodiments, the curvature of the first support segment I is greater than the curvature of the second support segment I; and / or the curvature of the first support segment I is greater than the curvature of the third support segment I.

[0035] In some embodiments, the second support segment I and the third support segment I are symmetrically arranged.

[0036] In some embodiments, the cross-section of the fourth support segment I is S-shaped or straight.

[0037] In some embodiments, the first connecting section includes a circular or arc-shaped head, and both ends of the head are respectively connected to an arc segment, wherein the curvature of the arc segment is greater than the curvature of the head, and the curvature of the head is less than the curvature of the second supporting section I.

[0038] In some embodiments, a gap is left between the outer side walls of the first connecting section and the second connecting section and the fourth supporting section I; under external force, the first connecting section and the second connecting section respectively abut against two sides of the fourth supporting section I.

[0039] The fourth aspect of the utility model is to provide a porous filter, which includes: a covering layer extending along the axial direction, a filter body formed by a curled web material is arranged in the covering layer, the filter body includes a first support segment II extending along the axial direction and dividing the covering layer into a first through hole and a second through hole, and a second support segment II and a third support segment II symmetrically arranged on both sides of the first support segment II, the second support segment II and the third support segment II respectively dividing the first through hole and the second through hole into a first sub-channel and a second sub-channel; a plurality of corrugations along the length direction are evenly spaced on the curled web material.

[0040] Among them, the second support segment II and the third support segment II both include: a first convex surface and a second convex surface with a C-shaped cross section and arranged in the longitudinal direction; a concave surface located between the first convex surface and the second convex surface, used to connect the second end of the bottom of the first convex surface and the first end of the top of the second convex surface, and with an inverted C-shaped cross section; the two opening ends of the first convex surfaces are arranged opposite to each other, and the second ends of the two tops of the first convex surfaces are connected to the first support segment II.

[0041] In some embodiments, the curvature of the concave surface is smaller than the curvature of the second convex surface, and the curvature of the second convex surface is smaller than the curvature of the first convex surface, so that the cross-section of the two symmetrically arranged second sub-channels is butterfly-shaped.

[0042] In some embodiments, there is a gap between the outer side wall of the concave curved surface and the corresponding supporting curved surface on the first supporting segment II.

[0043] In some embodiments, the cross-section of the first support segment II is S-shaped or straight.

[0044] In some embodiments, the first support segment II extends to the second end of the bottom of the second convex surface, and continues to extend along both sides perpendicular to the axial direction of the first support segment II to form a bearing structure located at the bottom of the second convex surface.

[0045] In some embodiments, the second convex surface is provided with a closed section which closes its open end and plays a supporting role.

[0046] In some embodiments, there is a gap between the closed segment and the first supporting segment II.

[0047] In some embodiments, in the same cross-section, the angle between the line connecting the tangent points between the two first convex surfaces on both sides of the first support segment II and the coating layer and the center of the coating layer is greater than the angle between the line connecting the tangent points between the two second convex surfaces on both sides of the symmetry axis and the coating layer and the center of the coating layer.

[0048] In some embodiments, the first ends of the two first convex surfaces are smoothly connected, so that in the same cross-section, the two first convex surfaces located on both sides of the first support segment II are co-tangent with the cladding layer at the top of the first support segment II.

[0049] In some embodiments, the filter body is made of biodegradable filter material; and / or the first support segment II, the second support segment II and the third support segment II are the curled webs curled to form a multi-layer structure.

[0050] The beneficial effect of the utility model is that in order to improve the user experience, the filter usually has a certain softness, but if it is designed as a hollow structure, it is bound to lead to insufficient support of the filter, and deformation will occur even with a slight force. If a component with a larger support force is directly set inside it, its softness will be sacrificed, resulting in a poor user experience. In view of this, by setting the filter of the above structure, a plurality of support segments are set in the coating layer, and the plurality of support segments are connected to form an integral channel, so as to form a porous structure in the filter, and the connected parts of the support segments form a movable support structure, so that when in use, for example, when the user just bites the filter, the support segment is appropriately deformed, giving the user a certain softness and comfort. At the same time, the deformation of the support segment makes the multiple support structures in the coating layer close to or abut each other, that is, the support structure in the coating layer is redistributed to prevent excessive deformation.

[0051] The utility model provides a filter with the above-mentioned structure, wherein a plurality of support segments are provided in the coating layer, for example, including a plurality of support segments which are provided along the circumferential direction and tangent to the inner wall of the coating layer, and two adjacent support segments are connected by specific connecting segments, so that the plurality of support segments enclose a large-sized overall channel, and at the same time, the coating layer is also supported (for example, a triangular support structure formed by connecting lines between the tangent points of the three support segments and the inner wall of the coating layer), so as to maintain the basic shape of the filter; and when the filter is subjected to external force, the space in the coating layer is redistributed through micro-deformation of the support segments and the connecting segments, and a new support structure is formed (for example, a support point formed by the abutment of the bottom of the connecting segments), so as to form a porous structure with greater support strength, thereby avoiding excessive deformation of the filter.

[0052] Furthermore, in some embodiments, the utility model divides the internal space of the covering layer into multiple channels extending axially by providing at least three support segments of specific shapes in the covering layer, and encloses a large-sized channel located in the middle area of ​​the covering layer by the multiple support segments. The channel not only has a high brand recognition, a large filtration area (compared to circular through holes) but also has a low suction resistance. At the same time, under the joint action of the multiple support segments, the porous filter has a certain softness and good support, and will not be excessively deformed even under the action of the user's mouth.

[0053] Furthermore, in some embodiments, the filter in the present application is able to form a triangular structure support for the coating layer by arranging three support segments along the circumferential direction inside the coating layer, and the three support segments cooperate with each other, so that when there is no external force, the basic shape of the filter is maintained; and when the filter is squeezed, the bottom of the first connecting segment and the bottom of the second connecting segment move closer to each other, and at the same time, the second and third free ends of the second support segment I and the third support segment I move toward the direction close to the first support structure, that is, to achieve the redistribution of the internal support structure of the coating layer to offset the external force, and at the same time form a porous structure with greater support strength, thereby avoiding excessive deformation of the filter. On the other hand, when the external force is large enough, the bottom of the first connecting segment and the bottom of the second connecting segment abut against each other to form a new support point. At the same time, the second free end of the second support segment I and the third free end of the third support segment I move upward, thereby redistributing the internal space of the filter (for example, the first channel is divided into multiple channels), so that the various support points are combined to form more triangular structures to support the coating layer, thereby effectively improving the support strength of the filter; therefore, the filter tip in the present application ensures softness so that it can be slightly deformed under the action of external force, but will not be excessively deformed, thereby providing users with a better smoking experience.

[0054] Furthermore, in some embodiments, the utility model sets a fourth support segment I, and the second and third free ends of the second support segment I and the third support segment I are always in contact with the fourth support segment I during the upward movement, so that the fourth support segment I can support and guide the two, thereby preventing the support structure formed by the second and third free ends of the second support segment I and the third support segment I from being offset (for example, offsetting toward the second support segment I, or offsetting toward the third support segment I) when the force is uneven.

[0055] Furthermore, in some embodiments, the utility model supports the second support segment I and the third support segment I by providing bearing segments on both sides of the second end of the fourth support segment I, which are respectively abutted against the second support segment I and the third support segment I, thereby forming a more stable support for the coating layer.

[0056] In summary, this solution comprehensively provides a filter whose internal structure changes dynamically after being subjected to force. By changing the number of supporting points and the number of channels inside the coating layer, the supporting strength of the filter is effectively improved, while providing users with a different suction experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative labor.

[0058] Figure 1 This is a schematic cross-sectional view of a porous filter in an embodiment of the utility model;

[0059] Figure 2 It is a cross-sectional schematic diagram of the bottom of the first connecting section and the second connecting section of the porous filter in the embodiment of the utility model in abutment state;

[0060] Figure 3 Schematic diagram of C-shaped and U-shaped structures in the embodiment of the utility model;

[0061] Figure 4 It is a schematic diagram of a triangular support structure generated when the filter of the utility model is deformed by force and the first connecting section is in contact with the second connecting section;

[0062] Figure 5 It is a cross-sectional schematic diagram of a porous filter in another embodiment of the utility model;

[0063] Figure 6 It is a three-dimensional structural diagram of a porous filter in an exemplary embodiment of the utility model;

[0064] Figure 7 It is a three-dimensional structural diagram of a porous filter in another exemplary embodiment of the utility model;

[0065] Figure 8 It is a cross-sectional schematic diagram of a porous filter in another embodiment of the utility model;

[0066] Fig. 9 It is a cross-sectional schematic diagram of a porous filter in another embodiment of the present invention.

[0067] Markings in the figure: 01 filter body; 02 coating layer; 03 overall channel, 03a, 03b fourth sub-channel; 06 first connecting section; 07 second connecting section; 08 first supporting structure; 09, 09' second supporting structure; 011 first supporting section I; 012 second supporting section I, 0121 second free end of second supporting section I; 013 third supporting section I, 0131 third free end of third supporting section I; 014 fourth supporting section I; 015 bearing section; O1 perpendicular midline of the cross section of first supporting section I011;

[0068] 011s the second supporting section II, 012s the third supporting section II, 013s the first supporting section II; 100a the first sub-channel, 100b the second sub-channel, 100b-1 the third sub-channel; 101 the first convex surface, 101-1 the first end of the first convex surface, 101-2 the second end of the first convex surface, 102 the second convex surface, 102-1 the first end of the second convex surface, 102-2 the second end of the second convex surface, 103 the concave surface; 104 the supporting surface; 105 the bearing structure; 106 the closed section; α the angle between the line connecting the tangent points between the two first convex surfaces and the coating layer and the center of the coating layer; β the angle between the line connecting the tangent points between the two second convex surfaces and the coating layer and the center of the coating layer. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0070] Herein, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention, and have no specific meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0071] In this document, the terms "upper", "lower", "inner", "outer", "front", "rear", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0072] In this document, unless otherwise clearly specified or limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0073] Herein, "and / or" includes any and all combinations of one or more of the listed related items. Herein, "plurality" means two or more, that is, it includes two, three, four, five, etc.

[0074] Herein, "filter" is used to describe an element having a large surface area and a predetermined resistance to draw. In use, the aerosol formed by the volatile compounds released from the aerosol-forming substrate passes through the aerosol-cooling element and is filtered and cooled by the filter before being inhaled by the user, and is therefore also referred to as an "aerosol-cooling element". In contrast to filters and other mouthpieces having high resistance to draw, the aerosol-cooling element has a low resistance to draw.

[0075] Herein, the filter body refers to a continuous web material formed by a continuous sheet through a processing device with corrugations or folds extending along its length, and then processed by a processing device and coated in a coating layer to form a specific shape structure. Among them, "sheet" means a laminated element whose width and length are generally greater than its thickness.

[0076] As used herein, "corrugation" means a plurality of generally parallel ridges formed from alternating peaks and valleys joined by the sides of the corrugation. This includes, but is not limited to, corrugations having a square wave profile, a sine wave profile, a triangular profile, a sawtooth profile, or any combination thereof. Accordingly, "curled sheet" means a sheet or web having a plurality of corrugations. And "curled corrugation" refers to a curled sheet or corrugations on a sheet or web.

[0077] As used herein, "axial" refers to a direction extending along or parallel to the length of a web or sheet or tubular element, also referred to as the longitudinal direction.

[0078] In this article, "smoking products" include traditional tobacco products, as well as new tobacco products, such as heat but not burn (HNB) products, atomizing electronic cigarette products, smokeless tobacco products, etc.

[0079] The term "abutment" used herein means that parts of two components are in contact with each other (including point contact or surface contact), and there is a certain interaction force between the two contacting parts.

[0080] In this article, "hollow" means that a through hole (including a through hole with a circular or non-circular cross section) extending along the axial direction is provided in the tubular element. For example, an integral channel 03 extending along the axial direction is formed in the coating layer 02 by the first support segment 1011, the second support segment 1012 and the third support segment 1013, see Figure 1 For another example, the fourth support segment I 014 divides the entire channel 03 into two left and right sub-channels, see Figure 5 For another example, the two second sub-channels 100b formed by the first support segment II 013s and the second support segment II 011s and the third support segment II 012s, see Figure 8 Accordingly, a plurality of through holes form a porous structure in the tubular element, wherein the through holes may also be referred to as channels or sub-channels.

[0081] The term "arc-shaped" herein means that the entirety of a component or its cross section is in an arc shape, or the entirety of the component or its cross section is formed by a plurality of arc-shaped segments connected smoothly.

[0082] The "C" shape in this article refers to a component whose entirety or cross-section is roughly in the shape of the English letter "C", such as Figure 5 Of course, it can also be a suitable deformation of the English letter "C". For example, the cross section of a component includes a circular or arc-shaped head, and its two ends extend to the corresponding ends along the extension direction away from the head, thereby forming a curved surface with an opening. Therefore, the component with a "C" shape as a whole or in cross section can also be called an arc segment. Among them, the circular head includes a semicircle or a semicircle-like or arc-like shape formed by a curve or a plurality of curves connected smoothly from beginning to end in sequence.

[0083] The "U"-shaped structure herein includes a component whose entirety or cross-section is roughly in the shape of the English letter "U", such as Figure 5 Of course, it can also be a suitable deformation of the English letter "U". For example, the cross section of a component includes a circular or arc-shaped head, and two arc segments are connected to its two ends respectively. The curvature of the arc segment is much greater than the curvature of the head, so that the arc segment is almost close to a straight line. Of course, if the arc segments at both ends of the head are shorter, the component or its cross section can also be approximately regarded as a C-shaped structure.

[0084] The "support structure" herein refers to a structure that supports the coating layer or the overall channel in maintaining its shape. For example, the portion connected between multiple support segments (or the portion connected between channels in a porous structure formed by multiple support segments), when the filter is subjected to force, makes some of the support structures formed by the multiple support segments close to or abut against each other, thereby being able to effectively support the support segments and further support the coating layer. For another example, the second free end 0121 of the second support segment I012 and the third free end 0131 of the third support segment I013 are directly connected, or the second free end 0121 of the second support segment I012 and the third free end 0131 of the third support segment I013 are in point contact / surface contact to form a first support structure 08, such as Figure 1 Another example is the second support structure 09 formed by the first connecting segment 06 and the second connecting segment 07 with their openings facing each other and with a certain gap between their bottoms, or the second support structure 09 formed when the bottoms of the first connecting segment 06 and the second connecting segment 07 are close to each other but not in contact with each other when the filter is subjected to force, or the second support structure 09' formed when the bottoms of the first connecting segment 06 and the second connecting segment 07 are in contact with each other when the filter is subjected to force, which can support the three support segments to a certain extent, and thus support the entire coating layer.

[0085] Example 1: Figure 1-Figure 6 The utility model provides a porous filter, including a coating layer 02 extending along the axial direction. Specifically, the cross-sectional shape of the coating layer 02 is circular, and a filter body 01 is arranged in the coating layer 02.

[0086] In some embodiments, the filter body 01 is made of biodegradable filter material with a thickness of 0.05 mm-0.12 mm.

[0087] Preferably, the filter body 01 is made of cellulose acetate. Preferably, the cellulose acetate may further contain a plasticizer (e.g., triacetin, triethylene glycol diacetate (TEGDA), polyethylene glycol (PEG) or other plasticizers or mixtures of plasticizers). If present, the plasticizer (e.g., triacetin) may be applied to the cellulose acetate material in an amount of 15% to 21.5% (preferably 15% to 19%) of the total weight of the cellulose acetate material. Considering the cross-sectional diameter of the coating layer 02 and other factors, the thickness of the filter body 01 is selected to be 0.08 mm.

[0088] Specifically, the length of the porous filter can be obtained by cutting according to actual needs.

[0089] Of course, in other embodiments, the porous filter may also be made of other biodegradable filter materials, such as a filter made of polylactic acid fiber.

[0090] In some embodiments, the filter body 01 includes at least three support segments, specifically, the at least three support segments include a first support segment I 011, a second support segment I 012, and a third support segment I 013, wherein the cross-sections of the first support segment I 011, the second support segment I 012, and the third support segment I 013 are all C-shaped, the opening of the first support segment I 011 faces the center of the cladding layer 02, and the two ends of the first support segment I 011 are connected to the connecting end of the second support segment I 012 and the connecting end of the third support segment I 013 through the first connecting segment 06 and the second connecting segment 07, respectively, and the second free end 0121 of the second support segment I 012 and the third free end 0131 of the third support segment I 013 are connected or contacted to form a movable first support structure 08, so that the first support segment I 011, the second support segment I 012, the third support segment I 013, the first connecting segment 06 and the second connecting segment 07 are combined to form an integral channel 03, and the first support segment I 011 The second supporting segment I 011, the second supporting segment I 012 and the third supporting segment I 013 each form a triangle with the tangent point of the coating layer 02, thereby providing basic support for the coating layer 02.

[0091] In some embodiments, see Figure 1 , three support segments are arranged inside the coating layer 02, wherein the curvature (or central angle) of the first support segment I011 is greater than the curvature (or central angle) of the second support segment I012 (i.e., the size of C1 formed by the first support segment I011 is greater than the size of C2 formed by the second support segment I012, see Figure 3 ), so that the second support segment I012 and the third support segment I013 are located within one-half circle of the cross section of the coating layer 02; and the opening ends of the second support segment I012 and the third support segment I013 are arranged opposite to each other and symmetrical about the perpendicular midline O1 of the cross section of the first support segment I011 (that is, the size of C2 formed by the second support segment I012 and the size of C3 formed by the third support segment I013 are the same or almost the same, see Figure 3 ). When the filter is subjected to stress, the parts at both ends of the first support segment I 011 that are respectively connected to the second support segment I 012 and the third support segment I 013 are more likely to gather toward the center of the filter, thereby forming a porous structure with greater support strength. Moreover, compared with uniformly arranging a plurality of small-sized through holes extending longitudinally along the circumferential direction or a large-sized through hole extending longitudinally, the problem of weakening the structural rigidity due to the arrangement of a plurality of small-sized through holes or a large-sized through hole is avoided, thereby causing the filter element to be easily deformed. Moreover, the support segment of the C-shaped structure not only ensures the support, but also increases the contact area of ​​the filter body, thereby improving the filtering effect.

[0092] In some embodiments, the first support segment 1011 to the third support segment 1013 are all single-layer or multi-layer structures formed during the curled web gathering process.

[0093] Of course, in other embodiments, the curvatures of the first support segment I 011 to the third support segment I 013 are the same and are evenly distributed along the circumference of the coating layer 02.

[0094] In some embodiments, Figure 3 , Figure 5 , the first connecting section 06 and the second connecting section 07 are in a U-shaped structure with the same shape and size. Preferably, the first connecting section 06 and the second connecting section 07 are symmetrical about the perpendicular midline O1 of the first supporting section I 011, and the opening width of the U-shaped structure gradually decreases in the direction away from the head. In the absence of external force, there is a gap between the bottom of the first connecting section 06 and the second connecting section 07 (that is, the outer side wall of the circular or arc-shaped head); when the filter is under force, the bottoms of the first connecting section 06 and the second connecting section 07 can be close to each other to form a second supporting structure 09, thereby supporting the external coating layer 02.

[0095] Furthermore, if Figure 2 and Figure 4 When the external force is large enough, the bottoms of the first connecting section 06 and the second connecting section 07 can abut against each other to form a second supporting structure 09' with greater supporting force. At the same time, the overall channel 03 is divided into at least two fourth sub-channels 03a and 03b, that is, the porous structure in the filter is changed, thereby changing the suction resistance of the filter, thereby providing users with different suction experiences.

[0096] Similarly, when the filter is subjected to force, the first support structure 08 gradually moves toward the second support structure 09, so that a new porous structure is formed inside the coating layer 02; and when the external force is large enough, the first support structure 08 and the second support structure 09 are in contact (at this time, the second free end 0121 of the second support segment I 012 and the third free end 0131 of the third support segment I 013 can be dispersed, but there is still a contact point between the two; or they may not be dispersed), and the first support structure 08 and the second support structure 09 and the tangent points (i.e., support points) between the three support segments and the coating layer 02 respectively form three triangular structure supports, see Figure 4 , thereby increasing the support strength of the filter after being subjected to force and preventing the filter from excessive deformation after being subjected to force; at the same time, the number and size of the channels change, that is, the porous structure changes, thereby changing the suction resistance of the filter, thereby providing users with a different suction experience.

[0097] In other embodiments, Figure 5The filter body 01 also includes a fourth support segment I 014 extending axially, a first end 0141 of the fourth support segment I 014 abuts against the top of the first support segment I 011 (preferably, the top is the area where the perpendicular bisector O1 of the cross section of the first support segment I 011 and the first support segment I 011 intersect; or, is the circular or arc-shaped head of the first support segment I 011), and a second end 0142 extends between the second free end 0121 of the second support segment I 012 and the third free end 0131 of the third support segment I 013, and finally abuts against the inner wall of the coating layer 02.

[0098] In some embodiments, the cross-section of the fourth support segment 1014 may be S-shaped, straight, or other irregular shapes.

[0099] In the case of setting the fourth support segment 1014, the second free end 0121 of the second support segment 1012 and the third free end 0131 of the third support segment 1013 are respectively in contact with the fourth support segment 1014. When the filter is deformed by force, the second and third free ends 0121 and 0131 of the second support segment 1012 and the third support segment 1013 move upward along the fourth support segment 1014, thereby causing the porous structure to change. It can be seen that the fourth support segment 1014 can guide the second and third free ends 0121 and 0131 of the second support segment 1012 and the third support segment 1013 while playing a supporting role, so as to guide the porous structure to change in a predetermined manner.

[0100] Further, in some embodiments, the second end 0142 (i.e., the end away from the first support segment 1011) of the fourth support segment 1014 extends along the direction close to the second support segment 1012 and the third support segment 1013, respectively, to form a bearing segment 015 for supporting the second support segment 1012 and the third support segment 1013, respectively, and the bearing segment 015 can support the second support segment 1012 and the third support segment 1013, further enhancing the support strength of the filter. Further, in some other embodiments, the two bearing segments 015 are in contact with the second support segment 1012 and the third support segment 1013, thereby more powerfully supporting the second support segment 1012 and the third support segment 1013.

[0101] In some embodiments, if the second free end 0121 of the second supporting segment 1012 and the third free end 0131 of the third supporting segment 1013 are merely abutted against each other, the curvature of the second supporting segment 1012 and the third supporting segment 1013 can be maintained by setting the bearing structure.

[0102] Furthermore, the two bearing sections 015 are symmetrically arranged on both sides of the second end 0142 of the fourth supporting section I 014, and their cross-section is teardrop-shaped (for example, their cross-section includes a circular or arc-shaped head, and their two ends extend away from the head and gradually approach each other and finally abut or nearly abut, thereby enclosing a closed or almost closed channel).

[0103] Herein, all the supporting sections, connecting sections and load-bearing sections are single-layer or multi-layer structures formed in the process of curling web materials, and each layer is provided with corrugations in the axial direction.

[0104] As described above, the present technical solution comprehensively provides a porous filter with a hollow structure that can dynamically change according to the external force conditions of the filter. The filter body inside the filter is set to a specific shape. When the filter is slightly deformed after being subjected to force, the microstructure of the filter body inside the filter is re-divided, thereby increasing the supporting force and preventing the filter from being excessively deformed. At the same time, the change in the spatial structure of the filter body will change the structure of the channels inside the filter and the number of support points, thereby providing structural stability while also generating different suction resistances, thereby providing customers with different suction experiences.

[0105] Embodiment 2: For those skilled in the art, the technical solution of the present utility model can also be described from different structural dimensions. For example, Figure 7 and Figure 8 The porous filters shown are Figure 6 and Figure 5 The above embodiments are completely consistent, but their structural features can be described in different ways. Specifically, in Embodiment 2, the porous filter comprises a coating layer 02 extending in the axial direction, and a filter body 01 is arranged in the coating layer 02 .

[0106] In some embodiments, see Figure 7 The filter body 01 includes a first support segment II 013s extending in the axial direction and dividing the coating layer 02 into a first through hole and a second through hole, and a second support segment II 011s and a third support segment II 012s symmetrically arranged on both sides of the first support segment II 013s. The second support segment II 011s and the third support segment II 012s respectively divide the first through hole and the second through hole into a first sub-channel 100a and a second sub-channel 100b of irregular shapes; wherein,

[0107] The second support section II 011s and the third support section II 012s both include: a C-shaped cross section and a longitudinal direction (i.e. Figure 8The first convex surface 101 and the second convex surface 102 are arranged in the height direction of the first support section II 013s in the cross section shown; the concave surface 103 is located between the first convex surface 101 and the second convex surface 102, and is used to connect the second end 101-2 at the bottom of the first convex surface 101 and the first end 102-1 at the top of the second convex surface 102, and the cross section is an inverted C-shaped. The opening ends of the two first convex surfaces 101 are arranged opposite to each other, and the first ends 101-1 at the tops of the two first convex surfaces 101 are in contact with the first support section I 1013s. Compared with uniformly arranging a plurality of small-sized through holes extending longitudinally along the circumferential direction or a large-sized through hole extending longitudinally, the technical solution of the utility model avoids the problem that the structural rigidity is weakened by arranging a plurality of small-sized through holes or a large-sized through hole, thereby causing the filter element to be easily deformed. Moreover, the support section of the C-shaped structure not only ensures the support, but also increases the contact area of ​​the filter body, thereby improving the filtering effect. At the same time, compared with the method of randomly arranged multiple small-sized longitudinal through holes or regularly arranged multiple regular through holes (such as PCT patent application No. PCT / EP2014 / 078951), the arrangement of the through holes is more reasonable and can reduce the suction resistance to a certain extent.

[0108] In some embodiments, the curvature of the concave surface 103 is smaller than the curvature of the second convex surface 102, and the curvature of the second convex surface 102 is smaller than the curvature of the first convex surface 101, so that the cross-sections of the two symmetrically arranged second sub-channels 100b are butterfly-shaped, see Figure 8 or Fig. 9 .

[0109] Specifically, see Fig. 9 In the same cross section, the angle α between the tangent points between the two first convex surfaces 101 on both sides of the symmetry axis and the coating layer 02 and the center of the coating layer 02 is greater than the angle β between the tangent points between the two second convex surfaces 102 on both sides of the symmetry axis and the coating layer 02 and the center of the coating layer 02. Since the angle α is greater than the angle β, when the filter is subjected to pressure, the two concave surfaces 103 gather toward the center of the filter, thereby forming a porous structure with greater support strength, that is, the porous structure in the filter changes. And, as Figure 8 and Fig. 9 As shown, since the second ends 102-2 of the two second convex surfaces 102 are in contact or abut against the supporting surfaces 104 on both sides of the first supporting section II 013s respectively, when the filter is subjected to pressure, the second ends 1202-2 of the two second convex surfaces 102 gather toward the center of the filter along the first supporting section II 013s, thereby forming a porous structure with greater supporting strength, thereby causing the porous structure in the filter to change in a predetermined manner.

[0110] In some embodiments, there is a gap between the outer side wall of the concave curved surface 103 and the supporting curved surface 104 on the corresponding side of the first supporting segment II 013s.

[0111] In some embodiments, the cross-section of the first support segment II 013s is S-shaped or straight.

[0112] In some embodiments, the first support segment II 013s to the third support segment II 012s are all formed during the curled web gathering process.

[0113] In some embodiments, the first support segment II 013s extends to the second end 102-2 at the bottom of the second convex surface 102, and continues to extend along both sides perpendicular to the first support segment II 013s (i.e., the axis of symmetry) to form a bearing structure 105 located at the bottom of the second convex surface 102. Specifically, the bearing structure 105 is formed during the gathering process of the curled web, and since the second ends of the second support segment II 011s and the third support segment II 012s are not connected to the first support segment II 013s but are in contact with each other, in order to prevent the second convex surface 102 from deforming, the bearing structure 105 is provided to prevent the second convex surface 102 from deforming.

[0114] In other embodiments, see Fig. 9 , the second convex surface 102 is provided with a closed section 106 that closes its open end and plays a supporting role. Specifically, the closed section 106 extends from the second end 102-2 of the second convex surface 102 to the first end 102-1, and contacts the first end 102-1 or the concave surface 103, so that an independent third sub-channel 100b-1 is formed in the second through hole; of course, under the action of the user's mouth or other external actions, the closed section 106 can be separated from the first end 102-1 or the concave surface 103 and then contact the first supporting section II 013s, so that the third sub-channel 100b-1 disappears, that is, the change of the internal channel is achieved through the closed section 106, so as to achieve fine adjustment of the suction resistance.

[0115] Of course, the closed section 106 may also be connected to the first end 102-1 of the second convex surface 102 or the concave surface 103, and have a gap between it and the first supporting section II 013s.

[0116] In some embodiments, the first ends 101-1 of the two first convex surfaces 101 are smoothly connected, so that the two first curved surfaces 101 and the cladding layer 02 are co-tangent at the top of the first support segment II 013s, see Figure 7 .

[0117] In this embodiment, "convex" and "concave" are relative to the geometric center of the through hole. Specifically, when the center of a circle corresponding to a curved surface and the geometric center of the through hole are on the same side of the curve, it is called a convex curved surface. For example, the center of the circle corresponding to the first convex curved surface 101 and the geometric center of the through hole (i.e., the second sub-channel 100b) are both on the same side of the first convex curved surface 101, and similarly, the second convex curved surface 102; and when the center of the circle corresponding to the curved surface and the geometric center of the through hole are respectively on both sides of the curve, it is called a concave curved surface. For example, the center of the circle corresponding to the concave curved surface 103 and the geometric center of the through hole (i.e., the second sub-channel 100b) are respectively on both sides of the concave curved surface 103.

[0118] In some embodiments, the curvature of the first convex surface 101 is greater than the curvature of the second convex surface 102, and the curvature of the second convex surface 102 is greater than the curvature of the concave surface 103. Since the curvatures of the first convex surface 101 and the second convex surface 102 are both greater than the concave surface 103, when the filter is subjected to an external force, the concave surfaces 103 on both sides of the first support segment II 013s will converge toward the center of the filter, and at the same time, the second ends 102-2 of the two second convex surfaces 102 will also converge toward the center of the filter, thereby forming a porous structure with greater support strength in the filter.

[0119] In some embodiments, the filter body 01 is made of cellulose acetate. Preferably, cellulose acetate may further contain a plasticizer (e.g., triacetin, triethylene glycol diacetate (TEGDA), polyethylene glycol (PEG) or other plasticizers or mixtures of plasticizers). If present, the plasticizer (e.g., triacetin) may be applied to the cellulose acetate material in an amount of 15% to 21.5% (preferably 15% to 19%) of the total weight of the cellulose acetate material. Specifically, the length of the porous filter can be cut and processed according to actual needs. Of course, in other embodiments, the porous filter can also be made of other biodegradable filter materials, such as polylactic acid fibers to make filter cigarette holders.

[0120] For those skilled in the art, the first support segment II 013s in Example 2 and the fourth support segment I 014 in Example 1 are actually the same structure, which divides the interior of the filter into a porous structure while also providing support for the coating layer 02, and guides the porous structure to change in a predetermined manner when the filter is slightly deformed by pressure.

[0121] In addition, in Example 2, the structure formed by connecting the first convex surface 101 of the second support segment II 011s and the first convex surface 101 of the third support segment II 012s corresponds to the first support segment I 011 in Example 1. The second convex surface 102 of the second support segment II 011s in Example 2 corresponds to the third support segment I 013 in Example 1. The second convex surface 102 of the third support segment II 012s in Example 2 corresponds to the second support segment I 012 in Example 1. The concave surface 103 of the second support segment II 011s in Example 2 corresponds to the second connecting segment 07 in Example 1. The concave surface 103 of the third support segment I I012s in Example 2 corresponds to the first connecting segment 06 in Example 1. The second sub-channel 100b in Example 2 corresponds to the channels on both sides of the fourth support segment I 014 in Example 1; the first sub-channel 100a in Example 2 corresponds to the channel between the outer side of the overall channel 03 and the cladding layer 02 in Example 1. The above structure forms a dynamically variable porous structure inside the filter. When the filter is subjected to external pressure, each channel structure undergoes micro-deformation, causing the connecting parts between the channels to gather toward the center of the filter, thereby forming a filter main body structure with greater support strength.

[0122] In addition, the bearing structure 105 in the second embodiment includes the bearing section 015 in the first embodiment.

[0123] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0124] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. A porous filter, characterized in that: include: A coating layer (02) extending in an axial direction, wherein a filter body (01) extending in an axial direction is arranged in the coating layer (02), wherein the filter body (01) comprises a first support segment I (011), a second support segment I (012) and a third support segment I (013), wherein the cross sections of the first support segment I (011), the second support segment I (012) and the third support segment I (013) are all C-shaped, wherein the opening of the first support segment I (011) faces the center of the coating layer (02), and the two ends of the first support segment I (011) are connected to the connection end of the second support segment I (012) and the third support segment I (013), respectively. The connecting end of the support segment I (013) is connected; the second free end (0121) of the second support segment I (012) and the third free end (0131) of the third support segment I (013) are connected or contacted to form a movable first support structure (08), so that the first support segment I (011), the second support segment I (012), and the third support segment I (013) are combined to form an integral channel (03), and the first support segment I (011), the second support segment I (012), and the third support segment I (013) each form a triangle at a tangent point with the coating layer (02); When the filter is squeezed under force, the parts of the first support segment I (011) connected to the second support segment I (012) and the third support segment I (013) respectively approach each other to form a second support structure (09), and the first support structure (08) moves in the direction of the second support structure (09).

2. A porous filter according to claim 1, characterized in that: The two ends of the first support segment I (011) are respectively connected to the connection end of the second support segment I (012) and the connection end of the third support segment I (013) through a first connection segment (06) with a U-shaped cross section and a second connection segment (07) with a U-shaped cross section, the openings of the first connection segment (06) and the second connection segment (07) are opposite to each other and there is a gap between the bottoms; when the filter is squeezed under force, the bottoms of the first connection segment (06) and the second connection segment (07) are close to each other to form a second support structure (09).

3. A porous filter according to claim 2, characterized in that: The filter body (01) also includes a fourth support segment I (014) extending axially, wherein the first end (0141) of the cross section of the fourth support segment I (014) abuts against the top of the first support segment I (011), and the second end (0142) extends to between the second free end (0121) of the second support segment I (012) and the third free end (0131) of the third support segment I (013), and finally abuts against the inner wall of the coating layer (02); when the filter is squeezed under force, the second free end (0121) of the second support segment I (012) and the third free end (0131) of the third support segment I (013) move along the fourth support segment I (014) toward the second support structure (09).

4. A porous filter according to claim 3, characterized in that: Both sides of the second end (0142) of the cross section of the fourth support segment I (014) extend in a direction close to the second support segment I (012) and the third support segment I (013) to form a bearing segment (015).

5. A porous filter according to claim 1, characterized in that: The curvature of the first support segment I (011) is greater than the curvature of the second support segment I (012); and / or the curvature of the first support segment I (011) is greater than the curvature of the third support segment I (013).

6. A porous filter according to claim 1, characterized in that: The second supporting section I (012) and the third supporting section I (013) are symmetrically arranged.

7. A porous filter according to claim 3, characterized in that: The cross section of the fourth support segment I (014) is S-shaped or straight-line-shaped.

8. A porous filter according to claim 2, characterized in that: The first connecting section (06) includes a circular or arc-shaped head, and the two ends of the head are respectively connected to an arc section, wherein the curvature of the arc section is greater than the curvature of the head, and the curvature of the head is less than the curvature of the second supporting section I (012).

9. A porous filter according to claim 3, characterized in that: There is a gap between the outer side walls of the first connecting section (06) and the second connecting section (07) and the fourth supporting section I (014); under external force, the first connecting section (06) and the second connecting section (07) respectively abut against the two sides of the fourth supporting section I (014).

10. A porous filter according to any one of claims 1 to 9, characterized in that: The thickness of the filter body (01) is 0.05 mm-0.12 mm; and / or the filter body (01) is made of biodegradable filter material.

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