CN109137345B - Preparation method of special filter material for laminating and filter material - Google Patents

Preparation method of special filter material for laminating and filter material Download PDF

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Publication number
CN109137345B
CN109137345B CN201810858031.9A CN201810858031A CN109137345B CN 109137345 B CN109137345 B CN 109137345B CN 201810858031 A CN201810858031 A CN 201810858031A CN 109137345 B CN109137345 B CN 109137345B
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filter material
preparation
singeing
temperature
membrane
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CN109137345A (en
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蒋启明
刘冲
聂松林
姜瑞明
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Tiandingfeng Nonwovens Co ltd
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Tiandingfeng Nonwovens Co ltd
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C3/00—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C15/00—Calendering, pressing, ironing, glossing or glazing textile fabrics
    • D06C15/08—Rollers therefor
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C9/00—Singeing

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The invention discloses a preparation method of a special filter material for a membrane and the filter material, and the preparation method comprises the following steps: the pre-spun raw cloth is subjected to tentering setting, singeing and cold roll calendering in sequence to prepare the special filter material for the membrane; wherein the upper roll temperature, the middle roll temperature and the lower roll temperature of the cold roll calendering are all 0-20 ℃. According to the preparation method of the special filter material for the film coating, the filter material is subjected to tentering setting instead of calendaring setting in the post-treatment setting link, and is subjected to high-temperature setting by eight drying ovens of a tenter, so that the surface stiffness of the filter material is good; the post-treatment singeing link of the filter material adopts a light-burning cold-rolling mode, so that the phenomenon that the surface of the filter material is smooth in the conventional singeing and calendaring treatment and the film covering is not firm during film covering is avoided; meanwhile, the surface of the filter material subjected to high-temperature shaping has better stiffness, the filter material is prevented from being soft and incapable of being coated, the finished product yield and qualification rate of a coated product are effectively improved, and the consumption is reduced.

Description

Preparation method of special filter material for laminating and filter material
Technical Field
The invention belongs to the technical field of industrial filter bag type dust removal, and particularly relates to a preparation method of a special filter material for a membrane and the filter material.
Background
The membrane-covered filter material is a filter material product with the characteristic of surface filtration formed by adding a compact filter layer on the surface of a common filter material. The compact filter layer is a continuous, uniform, microporous and extremely smooth film which is pressed on the surface of a common filter material. The membrane-coated filter material has the following advantages: (1) the filtering efficiency is improved, and especially, the filter has good interception effect on submicron dust with small particle size; the dust emission concentration reaches 10mg/Nm3Essentially zero emission is achieved; (2) due to the lower and more stable pressure difference, the quality of the product and the reliability of the system can be improved; (3) the pressure difference of the filter bag is low, the dust stripping performance is good, and the dust cleaning performance is good; (4) the dust cleaning frequency is low, and the service life of the filter bag can be greatly prolonged.
At present, in the market, a plurality of manufacturers specialized in filter material coating are provided, and the filter materials special for the coating purchased by the manufacturers are conventional singeing and calendaring filter materials, so that the filter materials are poor in stiffness, the surface of the filter materials is smooth, the fastness during coating is poor, and the waste is serious. Therefore, it is necessary to provide a membrane filter material product with excellent performance, so as to solve the problems of low production rate, high cost and low qualification rate in the process of processing and producing the membrane filter material at the present stage, and improve the stability of the quality of the membrane filter material product.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a special filter material for a membrane, which aims to solve the problems of low production rate, high cost and low qualified rate in the process of processing and producing the membrane filter material at the present stage; the stability of the quality of the membrane-covered filter material product is effectively ensured.
In order to achieve the above object, one aspect of the present invention provides a method for preparing a filter material specially used for a membrane, the method comprising: the pre-spun raw cloth is subjected to tentering setting, singeing and cold roll calendering in sequence to prepare the special filter material for the membrane; wherein the upper roll temperature, the middle roll temperature and the lower roll temperature of the cold roll calendering are all 0-20 ℃.
The invention also provides a special filter material for the membrane prepared by the preparation method.
According to the preparation method of the special filter material for the film coating, the filter material is subjected to tentering setting instead of calendaring setting in the post-treatment setting link, and is subjected to high-temperature setting by eight drying ovens of a tenter, so that the surface stiffness of the filter material is good; the post-treatment singeing link of the filter material adopts a light-burning cold-rolling mode, so that the phenomenon that the surface of the filter material is smooth in the conventional singeing and calendaring treatment and the film covering is not firm during film covering is avoided; meanwhile, the surface of the filter material subjected to high-temperature shaping has better stiffness, the filter material is prevented from being soft and incapable of being coated, the finished product yield and qualification rate of a coated product are effectively improved, and the consumption is reduced.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a flow chart of a method for preparing a filter material dedicated for membrane coating according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
One aspect of the present invention provides a method for preparing a filter material specially used for a membrane, comprising: the pre-spun raw cloth is subjected to tentering setting, singeing and cold roll calendering in sequence to prepare the special filter material for the membrane; wherein the upper roll temperature, the middle roll temperature and the lower roll temperature of the cold roll calendering are all 0-20 ℃.
A conventional filter material manufacturer for laminating adopts three-roller calendering and shaping, the temperatures of an upper roller, a middle roller and a lower roller are respectively 180 ℃, 80 ℃ and 180 ℃, and the calendering surface is contacted with a filter material during shaping, so that the shaping effect is poor, the filter material with loose edges is still loose after calendering and shaping, the stiffness and the dimensional stability are poor, and the laminating is not firm, particularly, the two edges of the filter material are severe. However, in the special filter material for the film coating, tentering setting rather than calendaring setting is adopted in the post-treatment setting link of the filter material, and the filter material is subjected to high-temperature setting by eight drying ovens of a tenter, because tentering setting belongs to three-dimensional space heat setting, the temperature of the oven of the tenter is higher, and the temperature of the last two drying ovens is up to 230 ℃, the surface stiffness of the filter material subjected to tentering setting is better, and the thermal dimension stability is better.
The conventional filter material product manufacturer for laminating adopts a hot rolling treatment mode during singeing, namely the temperatures of an upper roller, a middle roller and a lower roller of a calender are respectively 120 ℃, 120 ℃ and 80 ℃, and the treatment process can cause the surface of the filter material after calenderingIs relatively smooth, and can lead to the abnormal combination of the surface of the filter material and the membrane during the membrane covering process, thereby causing the membrane covering to be not firm, the membrane is easy to fall off in the use process of the product, and the final membrane covered product has large ventilation at 10m3/m2Min @200Pa or so causes the emission to exceed the standard and cannot be normally used. The method adopts a cold rolling treatment mode, namely the temperature of an upper roller, a middle roller and a lower roller is 0-20 ℃, the surface of the filter material subjected to calendaring treatment after singeing is calendered by a cold roller, so that the surface of the filter material is slightly rough, the rough surface can be effectively combined with a film during film coating, the film coating fastness is good, the air permeability is good, and the air permeability of a final film coating product can reach 2-5m3/m2Min @200Pa, the ultra-low emission requirement below 10mg can be well met.
According to the present invention, preferably, the temperatures of the first oven, the second oven, the third oven, the fourth oven, the fifth oven, the sixth oven, the seventh oven and the eighth oven for tentering setting are 165 ℃ to 175 ℃, 180 ℃ to 185 ℃, 190 ℃ to 195 ℃, 200 ℃ to 210 ℃, 210 ℃ to 215 ℃, 215 ℃ to 220 ℃, 220 ℃ to 225 ℃, 225 ℃ to 230 ℃, respectively, and the temperatures of the eight ovens are sequentially increased.
According to the invention, the tentering setting machine is adopted for tentering setting, the tentering setting machine is provided with eight drying ovens, hot air is continuously sprayed on the cloth surface through the fine holes in the circular air injection frame under the blowing action of the circulating fan, the unfixed pre-spun raw cloth is fed into a machine in an open width mode through the edge stripper, the raw cloth can be well set through the continuous constant-temperature drying ovens with different temperature sections, the dimensional stability of the filter material can be well controlled through heat setting, and the surface stiffness of the filter material is good.
According to the invention, the main speed of the tenter setting is preferably 4.5 to 6 m/min.
According to the invention, preferably, the burl flow rate of the singeing is 0.1-0.4 MPa; preferably 0.3-0.4 MPa.
The flow rate is about 0.6Mpa when the conventional manufacturer singes, the singeing surface of the filter material after singeing is harder and rougher, and the phenomenon that a coating film on the surface of the filter material is pierced can be caused when the coating film is coated, but the singeing link of the post-treatment of the filter material adopts a light-firing cold-rolling mode and singes by adopting the flow rate of 0.1-0.4Mpa, so that the problems that the singeing surface is too heavy and rough during singeing, and the film is pierced when the coating film is coated, so that the air permeability is larger and the normal use cannot be realized are effectively avoided.
According to the invention, the speed of the main machine for singeing is preferably 12-18 m/min.
According to the invention, preferably, the upper roll temperature, the middle roll temperature and the lower roll temperature of the cold roll calendering are all 0-10 ℃; preferably 0-5 deg.C.
According to the invention, the upper roll pressure, the middle roll pressure and the lower roll pressure of the cold roll calendering are preferably 0-2 MPa.
According to the invention, the roughness of the surface of the filter material is adjusted by controlling the pressure and the temperature of the upper, middle and lower three rollers of the cold roller calendering, so that the filter material product has a good film coating effect.
According to the present invention, preferably, the tenter setting and the singeing and cold calender are performed on two production lines, respectively.
In the invention, preferably, the post-spinning equipment is two production lines, and the first post-spinning equipment is an unreeling machine, a stentering machine, a setting machine and a reeling machine in sequence; the second post-spinning device is an unreeling machine, a tension frame, a singeing machine, a three-roller calender and a reeling machine in sequence.
The invention also provides a special filter material for the membrane prepared by the preparation method.
The special filter material product for laminating disclosed by the invention has the advantages of good cloth cover singeing effect, relatively roughness and good filter material stiffness, and effectively solves the problems that the filter material for laminating at the present stage is poor in quality and cannot meet the laminating requirement.
The invention is further illustrated by the following examples:
example 1
As shown in fig. 1, in this example, a filter material dedicated to coating of 500 g/square meter of terylene is prepared, the pre-spun raw cloth is firstly subjected to tentering setting, the eight sections of oven temperature of the tentering setting machine are 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 215 ℃, 225 ℃, 230 ℃, and the host machine speed is 5 m/min; and then, carrying out mild singeing and cold roll calendering, wherein the flow of a fire hole of the singeing machine is adjusted to be 0.1Mpa, the temperature of an upper roll, the temperature of a middle roll and the temperature of a lower roll of the three-roll calender are all 0 ℃, the pressure of the upper roll, the pressure of the middle roll and the pressure of the lower roll are all 0MPa, and the speed of a main machine is 15 m/min.
Example 2
The difference between this example and example 1 is that the burner flow of the singeing machine was adjusted to 0.2MPa, and the other steps and process parameters were the same as those of example 1.
Example 3
The difference between this example and example 1 is that the burner flow of the singeing machine was adjusted to 0.3MPa, and the other steps and process parameters were the same as those of example 1.
Example 4
The difference between this example and example 1 is that the burner flow of the singeing machine was adjusted to 0.4MPa, and the other steps and process parameters were the same as those of example 1.
Example 5
The difference between this example and example 3 is that the upper roll temperature, the middle roll temperature and the lower roll temperature of the three-roll calender are all 10 ℃, the upper roll pressure, the middle roll pressure and the lower roll pressure are all 0MPa, and other steps and process parameters are the same as those of example 3.
Example 6
The difference between this example and example 3 is that the upper roll temperature, the middle roll temperature and the lower roll temperature of the three-roll calender are all 20 ℃, the upper roll pressure, the middle roll pressure and the lower roll pressure are all 0MPa, and other steps and process parameters are the same as those of example 3.
Comparative example 1
The difference between the comparative example and the example 1 is that the flow rate of the burner of the singeing machine is adjusted to be 0.5Mpa, and other steps and process parameters are the same as those of the example 1.
Comparative example 2
The difference between the comparative example and the example 1 is that the flow rate of the burner of the singeing machine is adjusted to be 0.6MPa, and other steps and process parameters are the same as those of the example 1.
Comparative example 3
The difference between the comparative example and the example 1 is that the pre-spun raw cloth is firstly shaped by three rollers, the temperature of the upper roller, the temperature of the middle roller and the temperature of the lower roller are respectively 180 ℃, 80 ℃ and 180 ℃, and other steps and process parameters are the same as those of the example 1.
Test example
The special filter materials for the covering membrane prepared in the examples 1 to 6 and the comparative examples 1 to 3 are subjected to performance test according to GB/T6719-2009 standard, and the test results are shown in Table 1; wherein the stiffness was tested by touching.
TABLE 1
Figure 718258DEST_PATH_IMAGE001
Among them, the rough and rough surface is suitable for coating, the surface is the most ideal rough surface, and the excessive rough surface is not ideal coating, which easily causes the problem that the membrane is punctured during coating, resulting in large ventilation and abnormal use.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims (8)

1. A preparation method of a special filter material for a laminated film is characterized by comprising the following steps: the pre-spun raw cloth is subjected to tentering setting, singeing and cold roll calendering in sequence to prepare the special filter material for the membrane; wherein the upper roll temperature, the middle roll temperature and the lower roll temperature of the cold roll calendering are all 0-20 ℃;
the temperatures of the first oven, the second oven, the third oven, the fourth oven, the fifth oven, the sixth oven, the seventh oven and the eighth oven for tentering and shaping are respectively 165-175 ℃, 180-185 ℃, 190-195 ℃, 200-210 ℃, 210-215 ℃, 215-220 ℃, 220-225 ℃, 225-230 ℃, and the temperatures of the eight ovens are sequentially increased;
the flow rate of the singeing burner is 0.1-0.4 MPa;
the upper roll pressure, the middle roll pressure and the lower roll pressure of the cold roll calendering are all 0-2 MPa.
2. The preparation method of the special filter material for the covering membrane according to claim 1, wherein the speed of the main frame of the tentering setting is 4.5-6 m/min.
3. The preparation method of the special filter material for the coating film according to claim 1, wherein the singeing fire hole flow is 0.3-0.4 MPa.
4. The preparation method of the special filter material for the coating film according to claim 1, wherein the speed of the singeing host machine is 12-18 m/min.
5. The preparation method of the special filter material for the membrane covering according to claim 1, wherein the upper roll temperature, the middle roll temperature and the lower roll temperature of the cold roll calendering are all 0-10 ℃.
6. The preparation method of the special filter material for the membrane covering according to claim 5, wherein the upper roll temperature, the middle roll temperature and the lower roll temperature of the cold roll calendering are all 0-5 ℃.
7. The method for preparing the filter material specially used for tectorial membrane according to any one of claims 1 to 6, wherein, the tentering setting and the singeing and cold roll calendering are respectively carried out on two production lines.
8. The special filter material for the membrane prepared by the preparation method of any one of claims 1 to 7.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102008854A (en) * 2009-09-08 2011-04-13 厦门三维丝环保股份有限公司 Composite micropore filter material
CN107557997A (en) * 2017-10-12 2018-01-09 福建南纺有限责任公司 A kind of production method of the grease proofing acupuncture lacing felt filter material of water repellent

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01100223A (en) * 1987-10-13 1989-04-18 Kawasaki Steel Corp Production of grain-oriented silicon steel sheet having high magnetic flux density and low iron loss

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102008854A (en) * 2009-09-08 2011-04-13 厦门三维丝环保股份有限公司 Composite micropore filter material
CN107557997A (en) * 2017-10-12 2018-01-09 福建南纺有限责任公司 A kind of production method of the grease proofing acupuncture lacing felt filter material of water repellent

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