Fluoroplastic wire mesh corrugated structured packing for chemical industry and preparation method thereof

Abstract

The invention belongs to the technical field of structured packing and preparation methods, and discloses fluoroplastic wire mesh corrugated structured packing for chemical engineering and a preparation method. The packing is mainly and technically characterized by comprising a packing body formed by a plurality of corrugated meshes with crest lines and trough lines, the corrugated lines and the trough lines of the adjacent corrugated meshes intersect to form a certain angle, the corrugated meshes comprise vertical weft yarns and horizontal warp yarns, the warp yarns and the weft yarns comprise metal inner cores, and the metal inner cores are arranged in the packing body. The outer side of the metal inner core is wrapped with a fluoroplastic layer, and the fluoroplastic layer is fixed at the cross joint of the warp and the weft. After the woven mesh is heated, the fluoroplastic layers at the joints of the warp yarns and the weft yarns are melted and bonded together, so that the mesh is good in stability, the thickness at the joints of the warp yarns and the weft yarns is reduced, and the mesh is good in flatness; the metal inner core at the joint of the warp and the weft is not easy to separate from the fluoroplastic layer, so that the corrosion resistance of the whole fluoroplastic silk screen corrugated structured packing for the chemical industry is higher.

Description

Technical Field

[0001] The invention belongs to the technical field of structured packing and preparation methods, and in particular relates to a fluoroplastic wire mesh corrugated structured packing for chemical industry and a preparation method thereof. Background Art

[0002] In the fields of petrochemical, air separation, food processing, pharmaceutical, sewage treatment, etc., structured packing is needed for separation. The fluoroplastic wire mesh corrugated structured packing currently used in the chemical industry is mainly the following: First, metal plates or metal wire meshes are used, which have poor corrosion resistance, short service life, and will also cause pollution to the medium. In order to improve the corrosion resistance, the metal plates are made of corrosion-resistant materials such as titanium alloys, but they are expensive and difficult to promote. Second, non-metallic plates or non-metallic wire meshes are used, which have poor support strength and are easy to deform under high temperature conditions, affecting product performance. Third, non-metallic corrosion-resistant materials with certain strength such as ceramics are used. Due to the influence of the performance and processing technology of the ceramics themselves, the corrugated structured packing made of ceramic materials is heavy, large in volume, high in cost, low in specific surface area, and poor in effect. In addition, it is easy to be damaged during production, processing, storage, transportation and installation. Fourth, a layer of corrosion-resistant material, such as polytetrafluoroethylene material, is attached to the outside of the metal plate or metal wire mesh by spraying or slurry impregnation. The application publication number is "CN112973616A", the patent application number is "202110351557.X", and the patent name is "A high-strength polytetrafluoroethylene wire mesh chemical fluoroplastic wire mesh corrugated structured packing and its preparation method and application". In the invention patent application, it is disclosed that a layer of polytetrafluoroethylene material is attached to the outside of the metal wire mesh by spraying or slurry dipping. Although the chemical fluoroplastic wire mesh corrugated structured packing solves the problems of corrosion resistance and supporting strength, it has the following defects: First, the spraying or slurry dipping is done after the mesh is welded. The outer surface of the junction of the warp and the weft can be wrapped with a fluoroplastic layer, but there is no fluoroplastic material at the junction of the weft and the warp, and due to the tension of the fluoroplastic layer, there is a gap around the junction of the weft and the warp, but during transportation, installation and use, the junction of the warp and the weft is prone to slip, and the polytetrafluoroethylene layer at the junction of the warp and the weft is prone to fall off, so that the metal wire is directly exposed to the outside, and the corrosion resistance is greatly reduced; second, when heated after spraying, the ends of the warp and the weft are exposed to the outside and are easily corroded, and the corroded metal wires are prone to pollute the medium. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide a fluoroplastic wire mesh corrugated structured packing for chemical industry with good corrosion resistance, long service life, no pollution to the medium, large specific surface area, good treatment effect, small size and light weight.

[0004] In order to solve the above problems, the technical solution adopted by the fluoroplastic wire mesh corrugated structured packing for chemical industry of the present invention is: it includes a packing body composed of multiple corrugated meshes with crest lines and trough lines, and the corrugation lines and trough lines of adjacent corrugated meshes intersect at a certain angle, and is characterized in that: the corrugated mesh includes weft wires in the vertical direction and warp wires in the horizontal direction, and the warp wires and weft wires include a metal inner core, and a fluoroplastic layer is wrapped on the outside of the metal inner core, and is fixed at the intersection of the warp wires and the weft wires.

[0005] Its additional technical features are: The weft wire of each corrugated mesh sheet is one wire that is woven back and forth with a plurality of warp wires; A corrosion-resistant warp sleeve is provided at the ends of the cut warp threads; The packing body comprises at least two packing sub-bodies, which form a cylindrical packing body. Each packing sub-body comprises a plurality of corrugated mesh sheets, and the corrugated mesh sheets of each packing sub-body are connected together through transverse connecting lines.

[0006] The second technical problem to be solved by the present invention is to provide a method for preparing the above-mentioned fluoroplastic wire mesh corrugated structured packing for chemical industry.

[0007] In order to solve the above problems, the technical solution adopted by the method for preparing the fluoroplastic wire mesh corrugated structured packing for chemical industry of the present invention is as follows: the method comprises the following steps: The first step is to weave the mesh A planar mesh is woven by using composite wire wrapped with a fluoroplastic layer on the outside of a metal core; Step 2: Heating the mesh The processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; The third step is to stamp the mesh According to the needs, the flat mesh is punched to form corrugations on the surface of the mesh; Step 4: Cut the mesh According to the needs, the corrugated mesh after punching is cut into single pieces constituting structured packing; Step 5: Assembly The cut single pieces are assembled into fluoroplastic wire mesh corrugated structured packing for chemical industry.

[0008] For further improvement, for a fluoroplastic wire mesh corrugated structured packing for chemical use in which the weft wire of each corrugated mesh is one wire reciprocatingly woven with a plurality of warp wires, the method comprises the following steps: The first step is to obtain the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry. According to the design requirements, the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry is obtained; Step 2: Weaving the mesh Step 1: Design the mesh width According to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing, the width of the mesh is designed. The ratio of the mesh width to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing is 1.1:1-1.3:1. Step 2: Choose weaving equipment Use a weaving device that weaves back and forth with one weft thread; Step 3: Weaving the mesh A planar mesh is woven by using a composite wire wrapped with a fluoroplastic layer on the outside of a metal inner core, wherein the transverse weft wire of the mesh is reciprocatedly woven by one weft wire, and there are no ends on both sides of the mesh; Step 3: Heating the mesh The processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; Step 4: Stamping the mesh According to the needs, the flat mesh is punched to form corrugations on the surface of the mesh; Step 5: Cut the mesh According to the needs, the corrugated mesh after punching is cut into single pieces constituting structured packing; Step 6: Assembly The cut single pieces are assembled into fluoroplastic wire mesh corrugated structured packing for chemical industry.

[0009] For further improvement, for a chemical fluoroplastic wire mesh corrugated structured packing having a corrosion-resistant warp wire envelope at the cut warp wire ends, the method comprises the following steps: The first step is to obtain the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry. According to the design requirements, the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry is obtained; Step 2: Weaving the mesh Step 1: Design the mesh width According to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing, the width of the mesh is designed. The ratio of the mesh width to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing is 1.1:1-1.3:1. Step 2: Choose weaving equipment Use a weaving device that weaves back and forth with one weft thread; Step 3: Weaving the mesh A planar mesh is woven by using a composite wire wrapped with a fluoroplastic layer on the outside of a metal inner core, wherein the transverse weft wire of the mesh is reciprocatedly woven by one weft wire, and there are no ends on both sides of the mesh; Step 3: Heating the mesh The processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; Step 4: Stamping the mesh According to the needs, the flat mesh is punched to form corrugations on the surface of the mesh; Step 5: Cut the mesh According to the needs, the corrugated mesh after punching is cut into single pieces constituting structured packing; Step 6: Edge Banding Step 1: Heating Place the two cut sections of the cut single piece close to the heating plate for baking, and the baking temperature is controlled at 260-300℃; Step 2: Dip the envelope material After the ends of the two cross-sections of the heated single sheet are heated, the fluoroplastic layer wrapped outside shrinks due to the heat, and a section of the metal inner core is exposed at the ends of the warp wires. The heated single sheet with the metal inner core at the end is inserted into a material box with a sheath material, and the sheath material in the material box adheres to the high-temperature metal inner core and the surface of the fluoroplastic layer; Step 3: Reheating The two sections of the single sheet dipped in the envelope material are placed close to the heating plate again for baking, so that the warp envelope and the metal inner core are more firmly bonded; Step 7: Assembly The cut single pieces are assembled into fluoroplastic wire mesh corrugated structured packing for chemical industry.

[0010] As a further improvement, in the edge sealing step of the sixth step, the cover material in the dipped cover material in the step (ii) is polyperfluoroethylene propylene (FEP, full name: fluorinated ethylene propylene copolymer); the heating temperature in the reheating in the step (iii) is controlled at 260-300°C.

[0011] As a further improvement, in the sixth step of edge sealing, in step (ii), the envelope material in the dipping envelope material is ethylene-tetrafluoroethylene copolymer (ETFE for short); and in step (iii), the heating temperature in the reheating is controlled at 370-400°C.

[0012] For further improvement, for the chemical fluoroplastic wire mesh corrugated structured packing whose packing body comprises at least two separate packing bodies, the method comprises the following steps: The first step is to obtain the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry. According to the design requirements, the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry is obtained; Step 2: Weaving the mesh Step 1: Design the mesh width According to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing, the width of the mesh is designed. The ratio of the mesh width to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing is 1.1:1-1.3:1. Step 2: Choose weaving equipment Use a weaving device that weaves back and forth with one weft thread; Step 3: Weaving the mesh According to the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry, at least one warp wire near the middle of the weaving device is removed, and a composite wire wrapped with a fluoroplastic layer on the outside of the metal inner core is used to weave a flat mesh, and at least one warp wire of the woven mesh forms at least one row of wider mesh holes on the mesh, and the transverse weft wire of the mesh is reciprocatedly woven by one weft wire, and there is no end on both sides of the mesh; Step 3: Heating the mesh The processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; Step 4: Stamping the mesh According to the needs, the flat mesh is punched to form corrugations on the surface of the mesh; Step 5: Cut the mesh According to the needs, the corrugated mesh after punching is cut into single pieces constituting structured packing; Step 6: Edge Banding Step 1: Heating Place the two cut sections of the cut single piece close to the heating plate for baking, and the baking temperature is controlled at 260-300℃; Step 2: Dip the envelope material After the ends of the two cross-sections of the heated single sheet are heated, the fluoroplastic layer wrapped outside shrinks due to the heat, and a section of the metal inner core is exposed at the ends of the warp wires. The heated single sheet with the metal inner core at the end is inserted into a material box with a sheath material, and the sheath material in the material box adheres to the high-temperature metal inner core and the surface of the fluoroplastic layer; Step 3: Reheating The two sections of the single sheet dipped in the envelope material are placed close to the heating plate again for baking, so that the warp envelope and the metal inner core are more firmly bonded; Step 7: Assembly According to the assembly sequence and the diameter of the filler body, the filler body includes at least two filler parts, and the mesh of each filler part is arranged neatly. At this time, the large mesh holes without warp wires in the mesh are just on the same horizontal plane. The connecting wire is passed through the large mesh holes, and then the ends of the connecting wire are tied or fixed. Finally, multiple filler parts are arranged together to form a complete filler body.

[0013] The fluoroplastic wire mesh corrugated structured packing for chemical industry and the preparation method thereof provided by the present invention have the following advantages compared with the prior art: first, since the packing body is composed of a plurality of corrugated mesh sheets with crest lines and trough lines, the corrugation lines and trough lines of adjacent corrugated mesh sheets intersect at a certain angle, the corrugated mesh sheet comprises weft wires in the vertical direction and warp wires in the horizontal direction, the warp wires and weft wires comprise a metal inner core, a fluoroplastic layer is wrapped on the outer side of the metal inner core, the metal inner core is fixed at the intersection of the warp wires and the weft wires, and a composite wire wrapped with a fluoroplastic layer on the outer side of the metal inner core is used to weave a flat mesh sheet; the processed mesh sheet is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh sheet advances at a speed of The speed is 0.08 m / s-0.16 m / s; according to the needs, the flat mesh is punched to form corrugations on the surface of the mesh; according to the needs, the punched corrugated mesh is cut into single pieces to form regular packing; the cut single pieces are assembled into fluoroplastic wire mesh corrugated regular packing for chemical use. After the woven mesh is heated, the fluoroplastic layer at the junction of the warp and weft is melted and bonded together, the mesh has good stability, the thickness at the junction of the warp and weft becomes thinner, and the mesh has good flatness; and the fluoroplastic layer on the outside of the warp and weft is more firmly combined with the internal metal core, avoiding the separation of the metal core and the fluoroplastic layer under the action of external force, and there is no gap between the metal wire and the fluoroplastic layer at the junction of the warp and weft. Therefore, the warp The metal inner core and the fluoroplastic layer at the junction of the weft wire are not easy to separate, and the corrosion resistance of the entire chemical fluoroplastic wire mesh corrugated regular packing is stronger; secondly, since the weft wire of each corrugated mesh is one wire woven back and forth with multiple warp wires, the thickness of the chemical fluoroplastic wire mesh corrugated regular packing is obtained according to the design requirements; the width of the mesh is designed according to the thickness of the chemical fluoroplastic wire mesh corrugated regular packing, and the ratio of the mesh width to the thickness of the chemical fluoroplastic wire mesh corrugated regular packing is 1.1:1-1.3:1; a weaving device with a weft wire reciprocatingly weaving is selected; a composite wire wrapped with a fluoroplastic layer on the outside of the metal inner core is used to weave a flat mesh, and the transverse weft wire of the mesh is reciprocatingly woven by a weft wire, There are no ends on both sides; the processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; according to needs, the flat mesh is punched to form corrugations on the surface of the mesh; according to needs, the punched corrugated mesh is cut into single pieces to form structured packing; the cut single pieces are assembled into fluoroplastic wire mesh corrugated structured packing for chemical industry, the width of the mesh matches the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry, and there are no ends of the metal inner core on the upper and lower sides of the fluoroplastic wire mesh corrugated structured packing for chemical industry, which greatly improves the corrosion resistance of the entire fluoroplastic wire mesh corrugated structured packing for chemical industry and avoids further contamination of the medium;Thirdly, since a corrosion-resistant warp wire envelope is provided at the cut ends of the warp wires, after the corrugated mesh sheet after stamping is cut into single sheets constituting regular fillers, the two cut sections of the cut single sheet are placed close to a heating plate for baking, and the baking temperature is controlled at 260-300°C; after the ends of the two sections of the heated single sheet are heated, the fluoroplastic layer wrapped on the outside shrinks due to the heat, and a section of the metal inner core is exposed at the end of the warp wire, and the single sheet with the metal inner core at the heated end is inserted into a material box with an envelope material, and the envelope material in the material box adheres to the surface of the high-temperature metal inner core and the fluoroplastic layer; the two sections of the single sheet dipped in the envelope material are heated again. Baking close to the heating plate makes the warp wire envelope and the metal core more firmly bonded, and then assembling is carried out. In this way, the metal cores on the upper and lower surfaces of the fluoroplastic wire mesh corrugated regular packing for chemical use are wrapped in the envelope material with high corrosion resistance, and there is no exposed metal core on the entire fluoroplastic wire mesh corrugated regular packing for chemical use, which further improves the corrosion resistance of the fluoroplastic wire mesh corrugated regular packing for chemical use; Fourthly, since the packing body includes at least two packing splits, the packing splits form a cylindrical packing body, each packing split includes a plurality of corrugated mesh sheets, and the corrugated mesh sheets of each packing split are connected by horizontal connecting lines When weaving the mesh, at least one warp wire near the middle of the weaving equipment is removed to form at least one row of wider mesh holes on the mesh; when assembling the mesh, the large mesh holes lacking warp wires in the mesh are just on the same horizontal plane, and the connecting wire is passed through the large mesh holes, and then the ends of the connecting wire are tied or fixed, and finally the multiple fillers are arranged together to form a complete filler body, which is convenient for assembly and fixation. If there is no wider mesh hole in the mesh, in order to fix the mesh, it is necessary to pass the ordinary mesh hole with needle and thread, which is easy to cause the fluoroplastic layer on the outside of the metal inner core to be damaged, and the entire chemical fluoroplastic wire The corrosion resistance of the corrugated structured packing will be greatly reduced; Fifth, since the envelope material in the step (ii) of the edge sealing step of the sixth step is polytetrafluoroethylene (i.e., FEP material), the heating temperature in the reheating in the step (iii) is controlled at 260-300°C, and the bonding is more firm; Sixth, since the envelope material in the step (ii) of the edge sealing step of the sixth step is ethylene-tetrafluoroethylene copolymer (i.e., ETFE material), the heating temperature in the reheating in the step (iii) is controlled at 370-400°C, so that the envelope material and the metal core are more firmly combined. ; BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of the cross section of the fluoroplastic wire mesh corrugated structured packing for chemical industry of the present invention; Figure 2 It is a structural schematic diagram of a corrugated mesh; Figure 3 It is a cross-sectional view of the junction of the warp and weft; Figure 4 is a cross-sectional view of the warp; Figure 5 is a cross-sectional view of the weft; Figure 6 is a cross-sectional view of the upper edge of the mesh; Figure 7 It is a schematic diagram of the structure of a mesh with a warp sleeve; Figure 8 A schematic diagram of the structure of a mesh lacking one warp thread; Fig. 9 This is a schematic diagram of the structure of the assembled fluoroplastic wire mesh corrugated structured packing for chemical use. DETAILED DESCRIPTION

[0015] The structure, use principle and preparation method of the fluoroplastic wire mesh corrugated structured packing for chemical industry of the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the structural schematic diagram of the fluoroplastic wire mesh corrugated structured packing for chemical industry of the present invention, the fluoroplastic wire mesh corrugated structured packing for chemical industry of the present invention comprises a packing body 4 composed of a plurality of corrugated mesh sheets 3 with crest lines 1 and trough lines 2, the corrugation lines 1 and trough lines 2 of adjacent corrugated mesh sheets 3 intersect at a certain angle, the corrugated mesh sheets 3 comprise weft wires 5 in the vertical direction and warp wires 6 in the horizontal direction, the warp wires 6 comprise a metal inner core 61, a fluoroplastic layer 62 is wrapped around the outside of the metal inner core 61, the weft wires 5 comprise a metal inner core 51, a fluoroplastic layer 52 is wrapped around the outside of the metal inner core 51, and the weft wires 5 are fixed at the intersection of the warp wires 6 and the weft wires 5. The fluoroplastic layer 51 and the fluoroplastic layer 61 can be polyperfluoroethylene propylene (abbreviated as FEP, full name: fluorinated ethylene propylene copolymer), or other fluoroplastic materials.

[0017] A composite wire with a fluoroplastic layer 52 and a fluoroplastic layer 62 wrapped outside a metal inner core 51 and a metal inner core 61 is used to weave a plane mesh; the processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300, and the mesh advances at a speed of 0.08 m / s-0.16 m / s. As needed, the plane mesh is punched to form corrugations on the surface of the mesh; as needed, the punched corrugated mesh 3 is cut into single pieces constituting structured packing; the cut single pieces are assembled into fluoroplastic wire mesh corrugated structured packing for chemical industry. After the woven mesh is heated, the fluoroplastic layer at the junction of the warp 6 and the weft 5 melts and bonds together, the mesh has good stability, the thickness at the junction of the warp 6 and the weft 5 becomes thinner, and the mesh has good flatness; and the fluoroplastic layer 52 and the fluoroplastic layer 62 on the outside of the warp 6 and the weft 5 are more firmly combined with the internal metal inner core 51 and the metal inner core 61, thereby avoiding the separation of the metal inner core 51 and the metal inner core 61 from the fluoroplastic layer 52 and the fluoroplastic layer 62 under the action of external force, and there is no gap between the metal wire and the fluoroplastic layer at the junction of the warp and the weft, therefore, the metal inner core 51 and the metal inner core 61 at the junction of the warp 6 and the weft 5 are not easy to separate from the fluoroplastic layer 52 and the fluoroplastic layer 62, and the corrosion resistance of the entire chemical fluoroplastic wire mesh corrugated structured packing is stronger.

[0018] like Figure 6 As shown, the weft wire 5 of each corrugated mesh 3 is a single wire that is woven back and forth with a plurality of warp wires 6. According to the design requirements, the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry is obtained; according to the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry, the width of the mesh is designed, and the ratio of the mesh width to the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry is 1.1:1-1.3:1; a weaving device that reciprocates with a single weft wire 5 is selected; a composite wire wrapped with a fluoroplastic layer 52 and a fluoroplastic layer 62 on the outside of a metal inner core 51 and a metal inner core 61 is used to weave a flat mesh, and the transverse weft wire of the mesh is reciprocatedly woven by a single weft wire, and there are no ends on the transverse sides of the mesh; the processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300, and the mesh advance speed is 0.08 m / s-0.16 m / s; as needed, punch out the flat mesh to form corrugations on the surface of the mesh; as needed, cut the punched corrugated mesh into single pieces to form structured packing; assemble the cut single pieces into chemical fluoroplastic wire mesh corrugated structured packing, the width of the mesh matches the thickness of the chemical fluoroplastic wire mesh corrugated structured packing, and there are no ends of the metal inner core 51 of the weft wire on the upper and lower sides of the chemical fluoroplastic wire mesh corrugated structured packing, which greatly improves the corrosion resistance of the entire chemical fluoroplastic wire mesh corrugated structured packing and avoids further contamination of the medium.

[0019] like Figure 7As shown, a corrosion-resistant warp wire cover 9 is provided at the end of the cut warp wire 6. After the corrugated mesh sheet 3 after stamping is cut into single sheets constituting a regular packing, the two cut sections of the cut single sheet are placed close to a heating plate for baking, and the baking temperature is controlled at 260-300°C; after the ends of the two sections of the heated single sheet are heated, the fluoroplastic layer 62 wrapped on the outside shrinks due to the heat, and a section of the metal inner core 61 is exposed at the end of the warp wire 6, and the single sheet with the metal inner core 61 at the heated end is inserted into a material box with a cover material, and the cover material in the material box adheres to the high-temperature metal. The inner core and the surface of the fluoroplastic layer; the two sections of the single piece dipped in the envelope material are again placed close to the heating plate for baking, so that the warp wire envelope 9 and the metal inner core 61 are more firmly bonded, and then assembled. In this way, the metal inner cores on the upper and lower surfaces of the chemical fluoroplastic wire mesh corrugated regular packing are wrapped in the highly corrosion-resistant envelope material, and there is no exposed metal inner core on the entire chemical fluoroplastic wire mesh corrugated regular packing, which further improves the corrosion resistance of the chemical fluoroplastic wire mesh corrugated regular packing.

[0020] like Figure 8 and Fig. 9 As shown, the packing body 4 includes at least two packing parts 10, which form a cylindrical packing body. Each packing part 10 includes multiple corrugated mesh sheets 3, and the corrugated mesh sheets 3 of each packing part are connected together by a transverse connecting line 11. When weaving the mesh, at least one warp near the middle of the weaving device is removed to form at least one row of wider large mesh holes 12 on the mesh; when assembling the mesh, the large mesh holes 12 lacking warp threads in the mesh are just on the same horizontal plane, and the connecting line 11 is passed through the large mesh holes 12, and then the ends of the connecting line are tied or fixed to form the packing parts 10, and finally the multiple packing parts 10 are arranged together to form a complete packing body 3, so that it is easy to assemble and fix. If there is no such wide large mesh hole in the mesh, in order to fix the mesh, it is necessary to pass through the ordinary mesh hole with a needle and thread, which is easy to cause the fluoroplastic layer on the outside of the metal inner core to be damaged, and the corrosion resistance of the entire chemical fluoroplastic wire mesh corrugated regular packing will be greatly reduced.

[0021] The encapsulating material in the encapsulating material dipped in the edge sealing step is polyperfluoroethylene propylene (FEP, full name: fluorinated ethylene propylene copolymer); and the heating temperature in the reheating is controlled at 260-300°C, so that the bonding is more firm.

[0022] The envelope material in the dipped envelope material in the edge sealing step is ethylene-tetrafluoroethylene copolymer (ETFE for short); the heating temperature in the reheating is controlled at 370-400° C., so that the envelope material is more firmly combined with the metal inner core.

[0023] The technical scheme adopted by the method for preparing the fluoroplastic wire mesh corrugated structured packing for chemical industry of the present invention is as follows: the method comprises the following steps: The first step is to weave the mesh The planar mesh is woven by composite wires with fluoroplastic layers 52 and 62 wrapped around the outer sides of the metal inner cores 51 and 61; Step 2: Heating the mesh The processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; The third step is to stamp the mesh According to the needs, the flat mesh is punched to form corrugations on the surface of the mesh, forming a crest line 1 and a trough line 2; Step 4: Cut the mesh According to the needs, the corrugated mesh sheet 3 after punching is cut into single sheets constituting structured packing; Step 5: Assembly The cut single pieces are assembled into fluoroplastic wire mesh corrugated structured packing for chemical industry.

[0024] For further improvement, for a fluoroplastic wire mesh corrugated structured packing for chemical use in which the weft wire of each corrugated mesh is one wire reciprocatingly woven with a plurality of warp wires, the method comprises the following steps: The first step is to obtain the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry. According to the design requirements, the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry is obtained; Step 2: Weaving the mesh Step 1: Design the mesh width According to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing, the width of the mesh is designed. The ratio of the mesh width to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing is 1.1:1-1.3:1. Step 2: Choose weaving equipment Use a weaving device that weaves back and forth with one weft thread; Step 3: Weaving the mesh A planar mesh is woven by composite wires wrapped with fluoroplastic layers 52 and 62 on the outside of metal inner cores 51 and 61, wherein the transverse weft wires 5 of the mesh are reciprocally woven by one weft wire, and there are no ends on both transverse sides of the mesh; Step 3: Heating the mesh The processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; Step 4: Stamping the mesh According to the needs, the flat mesh is punched to form corrugations on the surface of the mesh; Step 5: Cut the mesh According to the needs, the corrugated mesh after punching is cut into single pieces constituting structured packing; Step 6: Assembly The cut single pieces are assembled into fluoroplastic wire mesh corrugated structured packing for chemical industry.

[0025] For further improvement, for a chemical fluoroplastic wire mesh corrugated structured packing having a corrosion-resistant warp wire envelope at the cut warp wire ends, the method comprises the following steps: The first step is to obtain the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry. According to the design requirements, the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry is obtained; Step 2: Weaving the mesh Step 1: Design the mesh width According to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing, the width of the mesh is designed. The ratio of the mesh width to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing is 1.1:1-1.3:1. Step 2: Choose weaving equipment Use a weaving device that weaves back and forth with one weft; Step 3: Weaving the mesh A planar mesh is woven by using a composite wire wrapped with a fluoroplastic layer on the outside of a metal inner core, wherein the transverse weft wire of the mesh is reciprocatedly woven by one weft wire, and there are no ends on both sides of the mesh; Step 3: Heating the mesh The processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; Step 4: Stamping the mesh According to the needs, the flat mesh is punched to form corrugations on the surface of the mesh; Step 5: Cut the mesh According to the needs, the corrugated mesh after punching is cut into single pieces constituting structured packing; Step 6: Edge Banding Step 1: Heating Place the two cut sections of the cut single piece close to the heating plate for baking, and the baking temperature is controlled at 260-300℃; Step 2: Dip the envelope material After the ends of the two cross-sections of the heated single sheet are heated, the fluoroplastic layer wrapped outside shrinks due to the heat, and a section of the metal inner core is exposed at the ends of the warp wires. The heated single sheet with the metal inner core at the end is inserted into a material box with a sheath material, and the sheath material in the material box adheres to the high-temperature metal inner core and the surface of the fluoroplastic layer; Step 3: Reheating The two sections of the single sheet dipped in the envelope material are placed close to the heating plate again for baking, so that the warp envelope and the metal inner core are more firmly bonded; Step 7: Assembly The cut single pieces are assembled into fluoroplastic wire mesh corrugated structured packing for chemical industry.

[0026] As a further improvement, in the edge sealing step of the sixth step, the cover material in the dipped cover material in the step (ii) is polyperfluoroethylene propylene (FEP, full name: fluorinated ethylene propylene copolymer); the heating temperature in the reheating in the step (iii) is controlled at 260-300°C.

[0027] As a further improvement, in the sixth step of edge sealing, in step (ii), the envelope material in the dipping envelope material is ethylene-tetrafluoroethylene copolymer (ETFE for short); and in step (iii), the heating temperature in the reheating is controlled at 370-400°C.

[0028] For further improvement, for the chemical fluoroplastic wire mesh corrugated structured packing whose packing body comprises at least two separate packing bodies, the method comprises the following steps: The first step is to obtain the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry. According to the design requirements, the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry is obtained; Step 2: Weaving the mesh Step 1: Design the mesh width According to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing, the width of the mesh is designed. The ratio of the mesh width to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing is 1.1:1-1.3:1. Step 2: Choose weaving equipment Use a weaving device that weaves back and forth with one weft; Step 3: Weaving the mesh According to the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry, at least one warp wire near the middle of the weaving device is removed, and a composite wire wrapped with a fluoroplastic layer on the outside of the metal inner core is used to weave a flat mesh, and at least one warp wire of the woven mesh forms at least one row of wider mesh holes on the mesh, and the transverse weft wire of the mesh is reciprocatedly woven by one weft wire, and there is no end on both sides of the mesh; Step 3: Heating the mesh The processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; Step 4: Stamping the mesh According to the needs, the flat mesh is punched to form corrugations on the surface of the mesh; Step 5: Cut the mesh According to the needs, the corrugated mesh after punching is cut into single pieces constituting structured packing; Step 6: Edge Banding Step 1: Heating Place the two cut sections of the cut single piece close to the heating plate for baking, and the baking temperature is controlled at 260-300℃; Step 2: Dip the envelope material After the ends of the two cross-sections of the heated single sheet are heated, the fluoroplastic layer wrapped outside shrinks due to the heat, and a section of the metal inner core is exposed at the ends of the warp wires. The heated single sheet with the metal inner core at the end is inserted into a material box with a sheath material, and the sheath material in the material box adheres to the high-temperature metal inner core and the surface of the fluoroplastic layer; Step 3: Reheating The two sections of the single sheet dipped in the envelope material are placed close to the heating plate again for baking, so that the warp envelope and the metal inner core are more firmly bonded; Step 7: Assembly According to the assembly sequence and the diameter of the filler body, the filler body includes at least two filler parts, and the mesh of each filler part is arranged neatly. At this time, the large mesh holes without warp wires in the mesh are just on the same horizontal plane. The connecting wire is passed through the large mesh holes, and then the ends of the connecting wire are tied or fixed. Finally, multiple filler parts are arranged together to form a complete filler body.

[0029] The protection scope of the present invention is not limited to the above-mentioned embodiments. As long as the structure is the same or similar to the structure of the fluoroplastic wire mesh corrugated regular packing for chemical industry of the present invention, or the preparation method is the same or similar to the preparation method of the fluoroplastic wire mesh corrugated regular packing for chemical industry, it falls within the protection scope of the present invention.

Claims

1. Fluoroplastic wire mesh corrugated structured packing for chemical industry, comprising a packing body composed of a plurality of corrugated mesh sheets with wave crest lines and wave trough lines, wherein the wave lines and wave trough lines of adjacent corrugated mesh sheets intersect at a certain angle, and characterized in that: The corrugated mesh includes wefts in the vertical direction and warps in the horizontal direction. The warps and wefts include a metal inner core. A fluoroplastic layer is wrapped outside the metal inner core and fixed at the intersection of the warps and wefts.

2. The fluoroplastic wire mesh corrugated structured packing for chemical industry according to claim 1, characterized in that: The weft thread of each corrugated mesh sheet is one thread that is reciprocatingly woven with a plurality of warp threads.

3. The fluoroplastic wire mesh corrugated structured packing for chemical industry according to claim 1 or 2, characterized in that: A corrosion-resistant warp sleeve is provided at the ends of the cut warp threads.

4. The fluoroplastic wire mesh corrugated structured packing for chemical industry according to claim 3, characterized in that: The packing body comprises at least two packing sub-bodies, which form a cylindrical packing body. Each packing sub-body comprises a plurality of corrugated mesh sheets, and the corrugated mesh sheets of each packing sub-body are connected together through transverse connecting lines.

5. The method for preparing the fluoroplastic wire mesh corrugated structured packing for chemical industry according to claims 1 to 4, characterized in that: The Method The following steps are involved: The first step is to weave the mesh A planar mesh is woven by using composite wire wrapped with a fluoroplastic layer on the outside of a metal core; Step 2: Heating the mesh The processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; The third step is to stamp the mesh According to the needs, the flat mesh is punched to form corrugations on the surface of the mesh; Step 4: Cut the mesh According to the needs, the corrugated mesh after punching is cut into single pieces constituting structured packing; Step 5: Assembly The cut single pieces are assembled into fluoroplastic wire mesh corrugated structured packing for chemical industry.

6. The method for preparing the fluoroplastic wire mesh corrugated structured packing for chemical industry as claimed in claim 2, characterized in that: The method comprises the following steps: The first step is to obtain the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry. According to the design requirements, the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry is obtained; Step 2: Weaving the mesh Step 1: Design the mesh width According to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing, the width of the mesh is designed. The ratio of the mesh width to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing is 1.1:1-1.3:

1. Step 2: Choose weaving equipment Use a weaving device that weaves back and forth with one weft; Step 3: Weaving the mesh A planar mesh is woven by using a composite wire wrapped with a fluoroplastic layer on the outside of a metal inner core, wherein the transverse weft wire of the mesh is reciprocatedly woven by one weft wire, and there are no ends on both sides of the mesh; Step 3: Heating the mesh The processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; Step 4: Stamping the mesh According to the needs, the flat mesh is punched to form corrugations on the surface of the mesh; Step 5: Cut the mesh According to the needs, the corrugated mesh after punching is cut into single pieces constituting structured packing; Step 6: Assembly The cut single pieces are assembled into fluoroplastic wire mesh corrugated structured packing for chemical industry.

7. The method for preparing the fluoroplastic wire mesh corrugated structured packing for chemical industry as claimed in claim 3, characterized in that: The method comprises the following steps: The first step is to obtain the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry. According to the design requirements, the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry is obtained; Step 2: Weaving the mesh Step 1: Design the mesh width According to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing, the width of the mesh is designed. The ratio of the mesh width to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing is 1.1:1-1.3:

1. Step 2: Choose weaving equipment Use a weaving device that weaves back and forth with one weft; Step 3: Weaving the mesh A planar mesh is woven by using a composite wire wrapped with a fluoroplastic layer on the outside of a metal inner core, wherein the transverse weft wire of the mesh is reciprocatedly woven by one weft wire, and there are no ends on both sides of the mesh; Step 3: Heating the mesh The processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; Step 4: Stamping the mesh According to the needs, the flat mesh is punched to form corrugations on the surface of the mesh; Step 5: Cut the mesh According to the needs, the corrugated mesh after punching is cut into single pieces constituting structured packing; Step 6: Edge Banding Step 1: Heating Place the two cut sections of the cut single piece close to the heating plate for baking, and the baking temperature is controlled at 260-300℃; Step 2: Dip the envelope material After the ends of the two cross-sections of the heated single sheet are heated, the fluoroplastic layer wrapped outside shrinks due to the heat, and a section of the metal inner core is exposed at the ends of the warp wires. The heated single sheet with the metal inner core at the end is inserted into a material box with a sheath material, and the sheath material in the material box adheres to the high-temperature metal inner core and the surface of the fluoroplastic layer; Step 3: Reheating The two sections of the single sheet dipped in the envelope material are placed close to the heating plate again for baking, so that the warp envelope and the metal inner core are more firmly bonded; Step 7: Assembly The cut single pieces are assembled into fluoroplastic wire mesh corrugated structured packing for chemical industry.

8. The method for preparing the fluoroplastic wire mesh corrugated structured packing for chemical industry according to claim 7, characterized in that: The method comprises the following steps: In the step (ii) of edge sealing of the sixth step, the encapsulating material in the encapsulating material is polyperfluoroethylene propylene; and in the step (iii), the heating temperature in the reheating is controlled at 260-300°C.

9. The method for preparing the fluoroplastic wire mesh corrugated structured packing for chemical industry according to claim 7, characterized in that: The method comprises the following steps: In the step (ii) of edge sealing of the sixth step, the cover material in the dipping cover material is ethylene-tetrafluoroethylene copolymer; and the heating temperature in the reheating in the step (iii) is controlled at 370-400°C.

10. The method for preparing the fluoroplastic wire mesh corrugated structured packing for chemical industry as claimed in claim 4, characterized in that: The method comprises the following steps: The first step is to obtain the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry. According to the design requirements, the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry is obtained; Step 2: Weaving the mesh Step 1: Design the mesh width According to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing, the width of the mesh is designed. The ratio of the mesh width to the thickness of the chemical fluoroplastic wire mesh corrugated structured packing is 1.1:1-1.3:

1. Step 2: Choose weaving equipment Use a weaving device that weaves back and forth with one weft thread; Step 3: Weaving the mesh According to the thickness of the fluoroplastic wire mesh corrugated structured packing for chemical industry, at least one warp wire near the middle of the weaving device is removed, and a composite wire wrapped with a fluoroplastic layer on the outside of the metal inner core is used to weave a flat mesh, and at least one warp wire of the woven mesh forms at least one row of wider mesh holes on the mesh, and the transverse weft wire of the mesh is reciprocatedly woven by one weft wire, and there is no end on both sides of the mesh; Step 3: Heating the mesh The processed mesh is heated in a heating tunnel, the heating temperature is controlled at 260-300°C, and the mesh advance speed is 0.08 m / s-0.16 m / s; Step 4: Stamping the mesh According to the needs, the flat mesh is punched to form corrugations on the surface of the mesh; Step 5: Cut the mesh According to the needs, the corrugated mesh after punching is cut into single pieces constituting structured packing; Step 6: Edge Banding Step 1: Heating Place the two cut sections of the cut single piece close to the heating plate for baking, and the baking temperature is controlled at 260-300℃; Step 2: Dip the envelope material After the ends of the two cross-sections of the heated single sheet are heated, the fluoroplastic layer wrapped outside shrinks due to the heat, and a section of the metal inner core is exposed at the ends of the warp wires. The heated single sheet with the metal inner core at the end is inserted into a material box with a sheath material, and the sheath material in the material box adheres to the high-temperature metal inner core and the surface of the fluoroplastic layer; Step 3: Reheating The two sections of the single sheet dipped in the envelope material are placed close to the heating plate again for baking, so that the warp envelope and the metal inner core are more firmly bonded; Step 7: Assembly According to the assembly sequence and the diameter of the filler body, the filler body includes at least two filler parts, and the mesh of each filler part is arranged neatly. At this time, the large mesh holes without warp wires in the mesh are just on the same horizontal plane. The connecting wire is passed through the large mesh holes, and then the ends of the connecting wire are tied or fixed. Finally, multiple filler parts are arranged together to form a complete filler body.

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