GB1568966A - Method of and apparatus for use in measuring the propensity of a textile material to acquire an electrostatic charge - Google Patents

Method of and apparatus for use in measuring the propensity of a textile material to acquire an electrostatic charge Download PDF

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Publication number
GB1568966A
GB1568966A GB46667/75A GB4666775A GB1568966A GB 1568966 A GB1568966 A GB 1568966A GB 46667/75 A GB46667/75 A GB 46667/75A GB 4666775 A GB4666775 A GB 4666775A GB 1568966 A GB1568966 A GB 1568966A
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United Kingdom
Prior art keywords
rollers
textile material
charge
current
sliver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB46667/75A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wira and Mather and Platt Ltd
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Wira and Mather and Platt Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to ZA766756A priority Critical patent/ZA766756B/en
Application filed by Wira and Mather and Platt Ltd filed Critical Wira and Mather and Platt Ltd
Priority to GB46667/75A priority patent/GB1568966A/en
Publication of GB1568966A publication Critical patent/GB1568966A/en
Expired legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/36—Textiles
    • G01N33/367—Fabric or woven textiles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/60—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrostatic variables, e.g. electrographic flaw testing

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Textile Engineering (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Description

(54) METHOD OF AND APPARATUS FOR USE IN MEASURING THE PROPENSITY OF A TEXTILE MATERIAL TO ACQUIRE AN ELECTROSTATIC CHARGE (71) We, WIRA, a British Company limited by guarantee under the Companies Acts 1908-17, 1948 and 1967, of Headingley Lane, Leeds, LS6 lBW, Yorkshire, do hereby declare the invention for which we pray that a patent may be granted to us and the method by which it is to be per- formed, to be particularly described in and by the following statement: The invention relates to a method of and apparatus for use in determining the propensity of a textile material to acquire an electrostatic charge in the course of textile processing and in particular to measuring the charge acquired by a textile material such as a sliver during its passage through a nip between a pair of rollers.
It is common knowledge in the textile trade that some (more than other) textile materials acquire a pronounced electrostatic charge in processing and that this can be disadvantageous to subsequent processing.
For example, charged slivers may adhere or 'slick" to the surface of processing rollers instead of, as is required, simply touching them tangentially and passing on. It Is possible to reduce the static electricity by the application of an antistatic agent in an appropriate quantity depending on the charging propensity of the material. Different fibres, however, have a different propensity to acquire a charge and significant differences in the propensity to acquire a charge may be observed even between batches of fibres that are nominally identical so that it becomes difficult to know how much antistatic agent to apply.
It is an object of the invention to provide a method of and apparatus for use in determining the propensity of a textile material to acquire an electrostatic charge.
According to one aspect of the invention there is provided a method of determining the propensity of a textile material to acquire an electrostatic charge comprising continuously passing said textile material in elongate form lengthwise through the nip between means defining a pair of opposed pressure surfaces of material different from said textile material so that a charge is produced upon the textile material, allowing or causing the corresponding charge or opposite sign on the surface defining means, to leak to earch as electric current, and measuring the magnitude of said current.
Preferably, the said pressure surfaces are provided by a pair of adjacent rollers rotatably mounted on parallel axes.
According to another aspect of the invention there is provided apparatus for use in measuring the propensity of an elongate textile material to acquire an electrostatic charge comprising a pair of adjacent rollers rotatably mounted on parallel axes so that the said textile material can be passed continuously through the nip therebetween a charge can be produced on the textile material and a charge of opposite sign can be produced on the rollers, the rollers being enclosed within, and electrically insulated from, an earthed metallic screen and the apparatus further comprising means for connecting the rollers to earth so that the charge can leak from the rollers as an electrical current and means whereby the magnitude of the said current can be determined as a measure of charge propensity.
Preferably said screen has apertures for the passage of textile material to and from said rollers Preferably at least one of the rollers is driven, the driving means being electrically insulated from the rollers. Preferably also the rollers are located one above the other and the upper roller is capable of being loaded to urge it against the lower roller, the loading means being electricallv insulated from the rollers. Again there is preferably provided a static eliminator to reduce any charge on the textile material passing to said rollers.
The invention will be further described with reference to a non-limiting embodiment, of which the attached single figure is a side elevation.
In the figure a lower roller 1 is mounted on axis 2 in a frame 3 which is electrically insulated by insulating block 4 from earthed screen 5. Lever arm 7 is pivoted about axis 8 also carried by frame 3. The arm 7 supports axis 9 of upper roller 10. Attached to the end of arm 7 remote from its pivot 8 is a block 11 of insulating material. The block 11 is formed with a depression 12 in which is located the lower end of a rod 13 which carries at its upper end a scale pan 14 on which can be placed weights such as 15. The frame is connected via insulated coaxial cable 16 to a current measuring device indicated schematically by rectangie 17. Outside of screen 5 and adjacent inlet aperture 18 is static eliminator 19. The aperture is for the passage of textile material, the path of which is indicated by dotted line 20.Outside of screen 5 and adjacent outlet aperture 21 is a pair of rollers 22 for drawing the textile material away from the apparatus. The lower roller 1 is connected by an insulating coupling to a variable speed motor not shown.
In use, a length of textile material such as a sliver of manmade fibres is passed from a supply (not shown), under static eliminator 19, which reduces any static that may be on the sliver at that point, and through aperture 18 into the enclosure formed by screen 5. The sliver is then passed through the nip between rollers 1 and 10 where it is compressed by the pressure exerted by weight 15 transmitted by the lever system based on lever arm 7. The drive to roller 1 is started up, and the sliver is driven towards the exit aperture 21 and the roller pair 22 which may be driven by the same drive means.
As the sliver passes between rollers 1 and 10 and separates from them an electrostatic charge will be produced upon it and an equal and opposite charge will be produced on the rollers. It will be obvious that the material of which the rollers are constructed is required to be different from the textile material and in the embodiment is steel. The charge on the rollers is leaked to earth via cable 16 producing a current. As this current is only of the order of 10- to 10-11 amps, the current measuring device 17 is of high sensitivity. The magnitude of the current determined by the device gives, bv inference, a measure of the rate of electrostatic charge production on the sliver, at the time of the determination of the current.
Tn order closely to simulate textile processing conditions, the load on the top roller l0 may be varied and the speed of the bottom roller 1 can also be varied. The apparatus can be used to test the propensity of slivers of different types to charging, and also to test the efficiency of slivers of diff- erent types to charging, and also to test the efficiency of different applications of antistatic agent on the sliver.
A signal representative of the current determined by device 17 may be recorded by means of a recording instrument. In another application, the signal may be used to control, by conventional means, the addition of an antistatic agent to the sliver whereby the propensity of the thus-treated sliver to acquire a charge is maintained within predetermined limits.
WHAT WE CLAIM IS: - 1. A method of determining the propensity of a textile material to acquire an electrostatic charge comprising continuously passing said textile material in elongate form lengthwise through the nip between means defining a pair of opposed pressure surfaces of material different from said textile material so that a charge is produced upon the textile material, allowing or causing the corresponding charge of opposite sign on the surface defining means to leak to earth as an electric current, and measuring the magnitude of said current.
2. A method as claimed in Claim 1 wherein the said pressure surfaces are provided by a pair of adjacent rollers rotatably mounted on parallel axes.
3. A method as claimed in Claim 2 wherein the rollers are enclosed within and electrically insulated from an earthed metallic screen.
4. A method as claimed in Claim 2 or 3 wherein static electricity is removed from the textile material before it is passed through the roller nip.
5. Apparatus for use in measuring the propensity of an elongate textile material to acquire an electrostatic charge comprising a pair of adjacent rollers rotatably mounted on parallel axes so that the said textile material can be passed continuously through the nip therebetween and a charge can be produced on the textile material and a charge of opposite sign can be produced on the rollers, the rollers being enclosed within.
and electrically insulated from, an earthed metallic screen and the apparatus further comprising means for connecting the rollers to earth so that the charge can leak from the rollers as an electrical current and means whereby the magnitude of the said current can be determined as a measure of charge propensity.
6. Apparatus according to Claim 5 wherein said screen has apertures for the passage of textile material to and from said rollers.
7. Apparatus according to Claim 5 or
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (1)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    The invention will be further described with reference to a non-limiting embodiment, of which the attached single figure is a side elevation.
    In the figure a lower roller 1 is mounted on axis 2 in a frame 3 which is electrically insulated by insulating block 4 from earthed screen 5. Lever arm 7 is pivoted about axis 8 also carried by frame 3. The arm 7 supports axis 9 of upper roller 10. Attached to the end of arm 7 remote from its pivot 8 is a block 11 of insulating material. The block 11 is formed with a depression 12 in which is located the lower end of a rod 13 which carries at its upper end a scale pan
    14 on which can be placed weights such as 15. The frame is connected via insulated coaxial cable 16 to a current measuring device indicated schematically by rectangie 17. Outside of screen 5 and adjacent inlet aperture 18 is static eliminator 19. The aperture is for the passage of textile material, the path of which is indicated by dotted line 20.Outside of screen 5 and adjacent outlet aperture 21 is a pair of rollers 22 for drawing the textile material away from the apparatus. The lower roller 1 is connected by an insulating coupling to a variable speed motor not shown.
    In use, a length of textile material such as a sliver of manmade fibres is passed from a supply (not shown), under static eliminator 19, which reduces any static that may be on the sliver at that point, and through aperture 18 into the enclosure formed by screen 5. The sliver is then passed through the nip between rollers 1 and 10 where it is compressed by the pressure exerted by weight 15 transmitted by the lever system based on lever arm 7. The drive to roller 1 is started up, and the sliver is driven towards the exit aperture 21 and the roller pair 22 which may be driven by the same drive means.
    As the sliver passes between rollers 1 and 10 and separates from them an electrostatic charge will be produced upon it and an equal and opposite charge will be produced on the rollers. It will be obvious that the material of which the rollers are constructed is required to be different from the textile material and in the embodiment is steel. The charge on the rollers is leaked to earth via cable 16 producing a current. As this current is only of the order of 10- to 10-11 amps, the current measuring device 17 is of high sensitivity. The magnitude of the current determined by the device gives, bv inference, a measure of the rate of electrostatic charge production on the sliver, at the time of the determination of the current.
    Tn order closely to simulate textile processing conditions, the load on the top roller l0 may be varied and the speed of the bottom roller 1 can also be varied. The apparatus can be used to test the propensity of slivers of different types to charging, and also to test the efficiency of slivers of diff- erent types to charging, and also to test the efficiency of different applications of antistatic agent on the sliver.
    A signal representative of the current determined by device 17 may be recorded by means of a recording instrument. In another application, the signal may be used to control, by conventional means, the addition of an antistatic agent to the sliver whereby the propensity of the thus-treated sliver to acquire a charge is maintained within predetermined limits.
    WHAT WE CLAIM IS: - 1. A method of determining the propensity of a textile material to acquire an electrostatic charge comprising continuously passing said textile material in elongate form lengthwise through the nip between means defining a pair of opposed pressure surfaces of material different from said textile material so that a charge is produced upon the textile material, allowing or causing the corresponding charge of opposite sign on the surface defining means to leak to earth as an electric current, and measuring the magnitude of said current.
    2. A method as claimed in Claim 1 wherein the said pressure surfaces are provided by a pair of adjacent rollers rotatably mounted on parallel axes.
    3. A method as claimed in Claim 2 wherein the rollers are enclosed within and electrically insulated from an earthed metallic screen.
    4. A method as claimed in Claim 2 or 3 wherein static electricity is removed from the textile material before it is passed through the roller nip.
    5. Apparatus for use in measuring the propensity of an elongate textile material to acquire an electrostatic charge comprising a pair of adjacent rollers rotatably mounted on parallel axes so that the said textile material can be passed continuously through the nip therebetween and a charge can be produced on the textile material and a charge of opposite sign can be produced on the rollers, the rollers being enclosed within.
    and electrically insulated from, an earthed metallic screen and the apparatus further comprising means for connecting the rollers to earth so that the charge can leak from the rollers as an electrical current and means whereby the magnitude of the said current can be determined as a measure of charge propensity.
    6. Apparatus according to Claim 5 wherein said screen has apertures for the passage of textile material to and from said rollers.
    7. Apparatus according to Claim 5 or
    Claim 6 wherein at least one of the rollers is driven, the driving means being electrically insulated from the rollers.
    8. Apparatus according to any one of Claims 5 to 7 wherein the rollers are located one above the other and the upper roller is capable of being loaded to urge it against the lower roller, the loading means being electrically insulated from the rollers.
    9. Apparatus according to any one of Claims 5 to 8 and further comprising a static eliminator to reduce any charge on the textile material passing to said rollers.
    10. A method as claimed in any one of claims 1 to 4 wherein a signal representative of the magnitude of said current is recorded by recording means.
    11. A method according to any one of claims 1 to 4 or 10 wherein a signal representative of the magnitude of the current is used to control the application of antistatic agent to the textile material.
    13. Apparatus for use in determining the propensity of an elongate textile material to acquire an electrostatic charge, substantially as described with reference to the accompanying drawing.
GB46667/75A 1976-11-11 1976-11-11 Method of and apparatus for use in measuring the propensity of a textile material to acquire an electrostatic charge Expired GB1568966A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ZA766756A ZA766756B (en) 1976-11-11 1976-11-10 Method and apparatus for measuring the propensity of a textile material to acquire an electronstatic charge
GB46667/75A GB1568966A (en) 1976-11-11 1976-11-11 Method of and apparatus for use in measuring the propensity of a textile material to acquire an electrostatic charge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB46667/75A GB1568966A (en) 1976-11-11 1976-11-11 Method of and apparatus for use in measuring the propensity of a textile material to acquire an electrostatic charge

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GB1568966A true GB1568966A (en) 1980-06-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0572842A1 (en) * 1992-06-04 1993-12-08 Hercules Incorporated Simultaneous generation and measurement of a triboelectric charge on a surface
FR2878034A1 (en) * 2004-11-12 2006-05-19 Renault Sas Seat textile e.g. polyester, triboelectric characterization method for motor vehicle, involves generating electrostatic charges by contact, rubbing and separation of seat and dress textile samples and measuring potential of dress sample

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0572842A1 (en) * 1992-06-04 1993-12-08 Hercules Incorporated Simultaneous generation and measurement of a triboelectric charge on a surface
US5341103A (en) * 1992-06-04 1994-08-23 Hercules Incorporated Apparatus for simultaneously generating and measuring a triboelectric charge
FR2878034A1 (en) * 2004-11-12 2006-05-19 Renault Sas Seat textile e.g. polyester, triboelectric characterization method for motor vehicle, involves generating electrostatic charges by contact, rubbing and separation of seat and dress textile samples and measuring potential of dress sample

Also Published As

Publication number Publication date
ZA766756B (en) 1977-10-26

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