CN108458662A - A method of online thickness evenness detection being carried out to serialization nanofiber mats using specific light source - Google Patents
A method of online thickness evenness detection being carried out to serialization nanofiber mats using specific light source Download PDFInfo
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- CN108458662A CN108458662A CN201810523914.4A CN201810523914A CN108458662A CN 108458662 A CN108458662 A CN 108458662A CN 201810523914 A CN201810523914 A CN 201810523914A CN 108458662 A CN108458662 A CN 108458662A
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- thickness
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- fibrofelt
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0616—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating
- G01B11/0625—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating with measurement of absorption or reflection
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- Treatment Of Fiber Materials (AREA)
Abstract
A method of online thickness evenness detection being carried out to serialization nanofiber mats using specific light source, belongs to field of new materials range.Using the constant visible light source of light intensity below the nanofiber mats vertical directive nanofiber mats at 0.5 5cm, and have corresponding light intensity sensor detection through the light intensity of nanofiber mats above nanofiber mats and be converted into resistance value.Light source intensity is adjusted according to the translucency of different-thickness fibrofelt, makes the light intensity of transmission within the scope of sensor is detectable.Thickness and light intensity calibration curve are obtained by the test of standard thickness sample, and unknown fibrofelt thickness is characterized according to light intensity variation degree.This method can highly desirable detect the uniformity of fibrofelt thickness according to the measurement of fibrofelt different location thickness.Real-time control is carried out by analyzing the data of the online thickness evenness of fibrofelt, and to the uniformity of prepared fibrofelt, further increasing preparation technology parameter etc. improves the uniformity coefficient of non-woven fabrics.
Description
Technical field
Online thickness evenness detection being carried out to serialization nanofiber mats using specific light source the present invention relates to a kind of
Method.Specifically with the visible light source that uses light intensity constant below the nanofiber mats vertical directive nanofiber mats at 0.5-5cm,
And there is corresponding light intensity sensor detection above nanofiber mats through the light intensity of nanofiber mats and be converted into resistance
Value.Adjust light source intensity according to the translucency of different-thickness fibrofelt, make the light intensity of transmission the detectable range of sensor it
It is interior.Thickness and light intensity calibration curve are obtained by the test of standard thickness sample, and unknown fibre is characterized according to light intensity variation degree
Tie up felt thickness.By the measurement to fibrofelt different location thickness, the uniformity of fibrofelt thickness can be detected.Belong to new material
Testing field range.
Background technology
Static Spinning carbon nanofiber felt has a big surface area (deriving from nanofiber diameter), relatively high conductivity,
Structural integrity, very thin form, chemical property is good, and absorption property is good etc., is commonly applied to the electrode material of capacitor, filtering
Medium, adsorption layer in protective garment etc..During the collection of electrospun nanofibers felt, thickness evenness
It is the key factor for influencing carbon nanofiber felt in above application.It would therefore be desirable to design a kind of science, accurate side
Method can carry out the thickness evenness of on-line checking continuity nanofiber mats.
However the method for most of detection nonwoven thickness uniformities is to use air penetration resistance measurement, it is fine by measuring
Felt is tieed up by the gas flow before and after air penetration, obtains air penetration impedance value, if non-woven fabrics local location density is big,
The air blowing flow that can bear is larger, then smaller by the wind speed after non-woven fabrics, illustrates big by vapour lock herein.If
Non-woven fabrics local location density is small, and the air blowing flow that can bear is smaller, then smaller by the wind speed after non-woven fabrics, explanation
It is small by vapour lock herein.There are following drawbacks for such detection method：1. the fibrofelt of same batch of sample cannot be detected specifically
Whole uniformity.2. for the fibrofelt of consecutive production, the thickness evenness of fibrofelt, shadow can not be effectively detected in real time
The adjusting for preparing fibrofelt parameter is rung, production efficiency is influenced.
In order to solve this problem, the present invention devises a kind of visible light source constant using light intensity to continuity Nanowire
The method that dimension felt carries out online thickness evenness detection.It is bent with light intensity calibration that thickness is obtained by the test of standard thickness sample
Line, and unknown fibrofelt thickness is characterized according to light intensity variation degree.Pass through the measurement to fibrofelt different location thickness, Ke Yijian
Survey the uniformity of fibrofelt thickness.This method is more more acurrate than traditional air blast test vapour lock flow, science.
Invention content
The object of the present invention is to provide a kind of thickness of effective, intuitive on-line checking continuity nanofiber mats is uniform
The method of property.By using the constant visible light source of light intensity below the nanofiber mats vertical directive nanofiber at 0.5-5cm
Felt, and there is corresponding light intensity sensor to detect the light intensity for penetrating nanofiber mats or simultaneously further above nanofiber mats
It is converted into resistance value；Obtain thickness and light intensity or resistance calibration curve by the test of standard thickness sample, and according to light intensity or
Resistance variations degree characterizes unknown fibrofelt thickness；By the measurement to fibrofelt different location thickness, fibrofelt can be detected
The uniformity of thickness.
A method of online thickness evenness detection, feature being carried out to serialization nanofiber mats using specific light source
Be, by using the constant visible light source of light intensity below nanofiber mats (i.e. nanofiber mats on the downside of or lower section) 0.5-
Vertical directive (from bottom to top) nanofiber mats at 5cm, and there is corresponding light intensity sensor to examine above nanofiber mats
It surveys the light intensity through nanofiber mats or and is converted into resistance value.The light intensity that each calibration test uses is makes the light intensity of transmission exist
Within the scope of sensor is detectable, light source intensity can be adjusted according to the translucency of different-thickness fibrofelt.
Further, according to resistance value in width direction whether unanimously come judge width direction whether consistency of thickness, resistance value
Consistent then consistency of thickness；According to resistance value on length direction whether unanimously come judge length direction whether consistency of thickness, resistance value
Consistent then consistency of thickness, resistance value is the resistance value on same width point on different time on length direction；
Further, it refers to that intensity of illumination is not influenced by factors such as temperature and times in detection process that light intensity is constant, it is seen that
The color of light source can regulate and control according to the color of different fibrofelts；
Further, light source intensity is adjusted according to the translucency of different-thickness fibrofelt, makes the light intensity of transmission can in sensor
Within the scope of detection；
Further, improving the thickness of continuity nanofiber mats can be accomplished in several ways, including and be not limited to：It carries
High spinning voltage or increase receive flight lead from, reduce spinning solution concentration (solid content), change polymer macromolecule copolymerization group
Point, reduce a kind of mode or various ways in the molecular weight etc. of polymer macromolecule；
Further, continuous nano-fibre felt can be composed of any suitable material.In certain implementation embodiments, continuously
Nanofiber mats can at least by a kind of polymer, copolymer, lignin, cellulose or sol inorganic material form can
The cloth or felt of light transmission.This nanofiber mats can also include a kind of additive, for example, at least one organic/inorganic salt, surface
Activating agent, organic compound, macromolecule, copolymer, nano particle, nanotube/nanofiber etc..
Further, the width direction of nanofiber mats, corresponding light intensity sensor is completely covered in the constant visible light source of light intensity
Also the width direction of nanofiber mats is completely covered；
Further, light source intensity is adjusted according to the translucency of different-thickness fibrofelt, makes the light intensity of transmission can in sensor
Within the scope of detection.Light intensity sensor can obviously embody different light intensity resistance according to the different thickness of fibrofelt, especially
It is that the light intensity resistance variations percentage of transmission different-thickness fibrofelt or multiple ratio is made to be corresponding average grammes per square metres in width direction
The variation percentage or multiple of (quality/square metre) than 0.5-2 times between；
Further, the constant visible light source of light intensity selects Led strip of lights, at a normal temperature in certain working time all
It can guarantee that light source output power is stablized within the scope of ± 0.01dBm, can ensure the temperature uniformity of light source and the stabilization of light intensity very well
Property；
Using the bottom-up irradiation fibrofelt of specific light source, light intensity sensor can detect specific light source and penetrate fibrofelt pair
The required intensity of light source in position is answered, and is shown with resistance value, according to the degree of resistance change, judges the uniform of fibrofelt
Property.
The uniformity of serialization fibrofelt has tripartite face influence factor, first, apparent observation fibrofelt is there are inhomogeneities,
Second is that the thickness of each position of fibrofelt is piled up the hole to be formed between macroscopic view, can be integrated third, fiber is distributed in a jumble
It is embodied in light intensity resistance intensity on ground.
Fibrofelt therein can be any fibrofelt/non-woven fabrics with translucency.
The present invention being capable of more accurately on-line checking constant light source vertically upward required for all positions of transmissive fiber felt
Light source intensity, and shown with resistance value, according to the degree of resistance change, analyze the thickness evenness of fibrofelt.Compared to it
Under, most of the method for thickness evenness of traditional test non-woven fabrics uses air penetration resistance measurement, by measuring fiber
Felt passes through the gas flow before and after air penetration, obtains air penetration impedance value, to judge the thickness evenness of fibrofelt, this
Kind method belongs to sampling method, does not have comprehensive.
The advantage of the invention is that：
(1) the constant visible light source of light intensity vertical directive nanofiber mats at 0.5-5cm below the nanofiber mats are used,
And there is corresponding light intensity sensor detection above nanofiber mats through the light intensity of nanofiber mats and be converted into resistance
Value.According to the degree of resistance change, the thickness evenness of fibrofelt is analyzed.Simultaneously according to the translucency of different-thickness fibrofelt
Light source intensity is adjusted, makes the light intensity of transmission within the scope of sensor is detectable.
(2) continuity nanofiber mats are irradiated by the constant visible light source of light intensity vertically upward, it can effectively comprehensively
Detect transmission nanofiber mats all positions need the intensity of light source and be converted to resistance value, according to resistance change journey
The thickness evenness of degree analysis nanofiber mats, can be easier to reach the requirement of fibrofelt thickness evenness in application aspect.
Description of the drawings
Fig. 1 is present device setting position structure front view；
Fig. 2 is present device setting position structure top view；
Fig. 3 is present device setting position the structure left view；
Fig. 4 be 1X thickness fibrofelt in the case where three kinds of light irradiate width direction glazing forceful electric power hinder distribution map；
Fig. 5 is light intensity distribution of resistance figure of the fibrofelt of 2X thickness in the case where three kinds of light irradiate in width direction；
Fig. 6 is light intensity distribution of resistance figure of the fibrofelt of 3X thickness in the case where three kinds of light irradiate in width direction；
Fig. 7 is light intensity distribution of resistance figure of the fibrofelt of 4X thickness in the case where three kinds of light irradiate in width direction；
Fig. 8 is light intensity resistance of the fibrofelt of different-thickness under intensity of illumination 1；
Fig. 9 is light intensity resistance of the fibrofelt of different-thickness under intensity of illumination 2；
Figure 10 is light intensity resistance of the fibrofelt of different-thickness under intensity of illumination 3；
Figure 11 is resistance value sensitivity technique of the fibrofelt of 1X thickness under intensity of illumination 1；
Figure 12 is resistance value sensitivity technique of the fibrofelt of 3X thickness under intensity of illumination 2；
Figure 13 is resistance value sensitivity technique of the fibrofelt of 4X thickness under intensity of illumination 3.
Specific implementation mode
With reference to embodiment, the invention will be further described, but the present invention is not limited to following embodiments.
It is following specific using using the constant visible light source of light intensity vertical irradiation different-thickness from bottom to top in embodiment
Continuity nanofiber mats judge that the thickness of fibrofelt is uniform according to the degree of the resistance change shown on light intensity sensor
Property.The fibrofelt used is obtained under following electrospinning conditions：
Continuity electrostatic spinning PAN based nano-fiber felts, the PAN solid contents of spinning solution are prepared using electrospinning process
10%, electrospinning parameters are as follows：Spinneret speed：700ul/h, voltage：17KV, spinneret syringe needle：(28#, 4 groups of syringe needles, every group 12
A syringe needle).The width direction of nanofiber mats is completely covered in super-radiation light source system, and corresponding light intensity sensor, which is also completely covered, to be received
The width direction of rice fibrofelt.
Embodiment 1
Using the constant visible light source of light intensity below the nanofiber mats vertical directive nanofiber mats at 0.5-5cm, and
And there is corresponding light intensity sensor detection above nanofiber mats through the light intensity of nanofiber mats and be converted into resistance value.
In the case of not adding any fibrofelt, three kinds of intensities of illumination have been used, have been that (light intensity resistance is light intensity 1 respectively
157 Ω), light intensity 2 (light intensity resistance be 710 Ω), light intensity 3 (light intensity resistance is 1.2K Ω), namely when without fibrofelt, light intensity sensing
The intensity of light source that device detects.In preparation process, it is a fibrofelt that preceding 10 minutes length and width directions, which control,
Thickness, the 2nd 10 minutes length and width direction control the thickness for two fibrofelts, the 3rd 10 minutes length and width
Direction controls the thickness for three fibrofelts, and the 4th minute length and width direction controls the thickness for four fibrofelts.
In the case of adhering to a fibrofelt in base fabric, a certain moment irradiates fibrofelt using three kinds of light sources, needed for
The intensity of light source wanted such as the following table 1 and Fig. 4, thus judge this fibrofelt in the direction of the width, thickness is uniform within the scope of 51~250mm
Good, the thickness evenness deviation within the scope of 0~50mm and 251~300mm of property.In the longitudinal direction, the thickness of fibrofelt is equal
Even property is good (by comparing the light intensity resistance of the length direction of strong 10 minute different moments, in certain upper base of point of same width value
This is consistent).The fibrofelt of one times of thickness can see fibrofelt in light intensity 1 most apparent thickness distribution in the direction of the width,
In light intensity 2 it can be seen that fibrofelt has obvious thickness distribution in the direction of the width, under light intensity 3, since fibrofelt is partially thin,
Intensity of illumination is big, so it readily penetrates through fibrofelt, it will not be because of the thickness of width direction between required light intensity resistance
Difference has significant difference.
1 three kinds of luminous intensities of table penetrate a certain moment required light intensity resistance in 10 minutes before a fibrofelt different in width direction
Power is distributed
In the case of adhering to two fibrofelts in base fabric, a certain moment irradiates fibrofelt using three kinds of light sources, needed for
The intensity of light source wanted such as the following table 2 and Fig. 5, thus judge this fibrofelt in the direction of the width, thickness is uniform within the scope of 51~250mm
Good, the thickness evenness deviation within the scope of 0~50mm and 251~300mm of property.In the longitudinal direction, the thickness of fibrofelt is equal
Even property is good (by comparing the light intensity resistance of the length direction of strong 10 minute different moments, in certain upper base of point of same width value
This is consistent).The fibrofelt of double thickness can see fibrofelt in light intensity 2 most apparent thickness distribution in the direction of the width,
Under light intensity 1, luminous intensity is relatively low, and fibrofelt is thicker, therefore fibrofelt is under the irradiation of luminous intensity 1, the thickness difference of width direction
Be not as apparent as light intensity 2 times；Under light intensity 3, since the fibrofelt of 2X thickness is still partially thin, intensity of illumination is big, so it is easy to wear
Saturating fibrofelt will not have significant difference between required light intensity resistance because of the thickness difference of width direction.
2 three kinds of luminous intensities of table penetrate a certain moment required light intensity resistance in 10 minutes before two fibrofelt different in width directions
Power is distributed
In the case of adhering to two fibrofelts in base fabric, a certain moment irradiates fibrofelt using three kinds of light sources, needed for
The intensity of light source wanted such as the following table 2 and Fig. 6, thus judge this fibrofelt in the direction of the width, thickness is uniform within the scope of 51~250mm
Good, the thickness evenness deviation within the scope of 0~50mm and 251~300mm of property.In the longitudinal direction, the thickness of fibrofelt is equal
Even property is good.The fibrofelt of three times thickness is in light intensity 2 and light intensity 3 it can be seen that fibrofelt has apparent thickness in the direction of the width
Distribution, under light intensity 1, since the fibrofelt of 3X thickness is thicker, intensity of illumination is small, so it is not easy to penetrate fibrofelt, it is required
There will not be significant difference because of the thickness difference of width direction between the light intensity resistance wanted.
3 three kinds of luminous intensities of table penetrate a certain moment required light intensity resistance in 10 minutes before three fibrofelt different in width directions
Power is distributed
In the case of adhering to two fibrofelts in base fabric, a certain moment irradiates fibrofelt using three kinds of light sources, needed for
The intensity of light source wanted such as the following table 2 and Fig. 7, thus judge this fibrofelt in the direction of the width, thickness is uniform within the scope of 51~250mm
Good, the thickness evenness deviation within the scope of 0~50mm and 251~300mm of property.In the longitudinal direction, the thickness of fibrofelt is equal
Even property is good.The fibrofelt of four times of thickness can see fibrofelt in light intensity 3 most apparent thickness distribution in the direction of the width,
Under light intensity 2, the thickness difference in width direction sees that its required light intensity resistance deviation is smaller；Under light intensity 1, due to 3X
The fibrofelt of thickness is thicker, and intensity of illumination is small, will not be because so it is not easy to penetrate fibrofelt, between required light intensity resistance
There is significant difference for the thickness difference of width direction.
4 three kinds of light intensity of table penetrate four required light intensity resistance diagrams in fibrofelt different in width direction
Embodiment 2
More smooth in the fibrofelt of 1X thickness one piece is chosen, in the case of intensity of illumination 1, is uniformly chosen above
4 × 4=16 point, it is laterally longitudinal respectively every mono- point of 10mm, light is measured through the required light intensity electricity of the above-mentioned point of fibrofelt
Resistance.The sensitivity of detection light forceful electric power resistance, data are listed in the table below 5：
Light intensity resistance (the unit of each measurement point of 5 fibrofelt of table：Ω)
| 515.1 | 515.2 | 515 | 514.9 |
| 514.9 | 515.2 | 515.1 | 515 |
| 515.1 | 514.8 | 514.9 | 515.2 |
| 514.9 | 515 | 515.2 | 515.2 |
More smooth in the fibrofelt of 3X thickness one piece is chosen, in the case of intensity of illumination 2, is uniformly chosen above
4 × 4=16 point, it is laterally longitudinal respectively every mono- point of 10mm, light is measured through the required light intensity electricity of the above-mentioned point of fibrofelt
Resistance.The sensitivity of detection light forceful electric power resistance, data are listed in the table below 6：
| 7.7001K | 7.6998K | 7.7K | 7.7002K |
| 7.7002K | 7.6999K | 7.7003K | 7.7001K |
| 7.7002K | 7.6999K | 7.7K | 7.7K |
| 7.6998K | 7.6998K | 7.7002K | 7.6999K |
More smooth in the fibrofelt of 4X thickness one piece is chosen, in the case of intensity of illumination 3, is uniformly chosen above
4 × 4=16 point, it is laterally longitudinal respectively every mono- point of 10mm, light is measured through the required light intensity electricity of the above-mentioned point of fibrofelt
Resistance.The sensitivity of detection light forceful electric power resistance, data are listed in the table below 7：
Table 7.
| 66.9998K | 66.9998K | 67.0001K | 66.9997K |
| 67.0001K | 66.9998K | 67.0001K | 66.9998K |
| 66.9998K | 66.9997K | 66.9999K | 67.0001K |
| 67K | 67.0002K | 66.9999K | 67K |
Claims (10)
1. a kind of method carrying out online thickness evenness detection to serialization nanofiber mats using specific light source, feature exist
In, by using the constant visible light source of light intensity below the nanofiber mats vertical directive nanofiber mats at 0.5-5cm, and
There is corresponding light intensity sensor detection above nanofiber mats through the light intensity of nanofiber mats or and is converted further into
Resistance value；Thickness and light intensity or resistance calibration curve are obtained by the test of standard thickness sample, and is become according to light intensity or resistance
Change degree characterizes unknown fibrofelt thickness；By the measurement to fibrofelt different location thickness, fibrofelt thickness can be detected
Uniformity.
2. a kind of use specific light source described in accordance with the claim 1 carries out online thickness evenness to serialization nanofiber mats
The method of detection, which is characterized in that the constant visible light source directive fibrofelt of light intensity, above light intensity sensor detect fiber
The light intensity of felt is shown with resistance value.
3. a kind of use specific light source described in accordance with the claim 1 carries out online thickness evenness to serialization nanofiber mats
The method of detection, which is characterized in that according to resistance value in width direction whether unanimously come judge width direction whether consistency of thickness,
The consistent then consistency of thickness of resistance value；According to resistance value on length direction whether unanimously come judge length direction whether consistency of thickness,
The consistent then consistency of thickness of resistance value, resistance value is the resistance value on same width point on different time on length direction.
4. a kind of use specific light source described in accordance with the claim 1 carries out online thickness evenness to serialization nanofiber mats
The method of detection, which is characterized in that light intensity is constant refer in detection process intensity of illumination not by the factors shadow such as temperature and time
It rings, it is seen that the color of light source can regulate and control according to the color of different fibrofelts.
5. a kind of use specific light source described in accordance with the claim 1 carries out online thickness evenness to serialization nanofiber mats
The method of detection, which is characterized in that serialization nanofiber mats at least by a kind of polymer, copolymer, lignin, cellulose,
Or the cloth or felt for capableing of light transmission of sol inorganic material composition.
6. a kind of use specific light source described in accordance with the claim 1 carries out online thickness evenness to serialization nanofiber mats
The method of detection, which is characterized in that the width direction of nanofiber mats, corresponding light intensity is completely covered in the constant visible light source of light intensity
The width direction of nanofiber mats is also completely covered in sensor.
7. a kind of use specific light source described in accordance with the claim 1 carries out online thickness evenness to serialization nanofiber mats
The method of detection, which is characterized in that light source intensity is adjusted according to the translucency of different-thickness fibrofelt, the light intensity of transmission is made to pass
Within the scope of sensor is detectable；Light intensity sensor can obviously embody different resistance values according to the different thickness of fibrofelt,
Especially in width direction, it is corresponding average to make the light intensity resistance variations percentage of transmission different-thickness fibrofelt or multiple ratio
Grammes per square metre variation percentage or multiple than 0.5-2 times between.
8. a kind of use specific light source described in accordance with the claim 1 carries out online thickness evenness to serialization nanofiber mats
The method of detection, which is characterized in that thickness and light intensity calibration curve are obtained by the test of standard thickness sample, and according to light intensity
Variation degree characterizes unknown fibrofelt thickness；By the measurement to fibrofelt different location thickness, fibrofelt thickness can be detected
Uniformity.
9. a kind of use specific light source described in accordance with the claim 1 carries out online thickness evenness to serialization nanofiber mats
The method of detection, which is characterized in that the constant visible light source of its light intensity selects Led strip of lights；Its certain work at a normal temperature
Make to ensure that light source output power is stablized within the scope of ± 0.01dBm in the time.
10. described in accordance with the claim 1 a kind of uniform to the online thickness of serialization nanofiber mats progress using specific light source
Property detection method, which is characterized in that the basic functional principle of light intensity sensor (photo resistance) is：Light intensity sensor is (photosensitive
Resistance) it is a kind of power incuding light and the test device for being shown, being handled；Light intensity sensor (photo resistance) uses resistance value
To show the intensity of illumination.
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| CN111020719A (en) * | 2019-12-16 | 2020-04-17 | 大连理工大学 | Device and method for preparing nanofiber membrane with controllable thickness |
| CN113592811A (en) * | 2021-07-29 | 2021-11-02 | 常州大学 | Melt-blown fabric thickness consistency detection method based on image processing |
| CN116295051A (en) * | 2023-03-20 | 2023-06-23 | 河北日泰新型管材有限公司 | Cross-linked polyethylene pipe wall thickness measuring method based on special frequency illumination recognition technology |
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Application publication date: 20180828 |