EP0553063A1 - A yarn for the production of knitted articles able to attenuate low and medium frequency electromagnetic fields - Google Patents
A yarn for the production of knitted articles able to attenuate low and medium frequency electromagnetic fields Download PDFInfo
- Publication number
- EP0553063A1 EP0553063A1 EP93830007A EP93830007A EP0553063A1 EP 0553063 A1 EP0553063 A1 EP 0553063A1 EP 93830007 A EP93830007 A EP 93830007A EP 93830007 A EP93830007 A EP 93830007A EP 0553063 A1 EP0553063 A1 EP 0553063A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- yarn
- carbon
- production
- electromagnetic fields
- medium frequency
- 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.)
- Withdrawn
Links
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Classifications
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/441—Yarns or threads with antistatic, conductive or radiation-shielding properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/005—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using woven or wound filaments; impregnated nets or clothes
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2101/00—Inorganic fibres
- D10B2101/10—Inorganic fibres based on non-oxides other than metals
- D10B2101/12—Carbon; Pitch
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
- D10B2201/20—Cellulose-derived artificial fibres
- D10B2201/22—Cellulose-derived artificial fibres made from cellulose solutions
- D10B2201/24—Viscose
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2211/00—Protein-based fibres, e.g. animal fibres
- D10B2211/01—Natural animal fibres, e.g. keratin fibres
- D10B2211/02—Wool
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D10B2321/10—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
Definitions
- the present invention relates to the field of yarns for knitted products and more precisely to a yarn for the production of knitted articles able to screen the body of the person wearing them from electromagnetic waves by attenuating electromagnetic fields of low and medium frequency.
- nylon-carbon composed of a support in nylon to which the carbon is anchored
- a base yarn, rayon viscose, chosen for its characteristics of fluidity and silkiness was combined with 4 to 7% of nylon-carbon yarn. Said combination proved optimum for summer clothing to be worn in direct contact with the skin since rayon viscose, being fluid and silky, compensates for the apperance and feel of the carbon yarn which, otherwise, would be too rigid and rough to be worn in contact with the skin.
- the yarn according to the invention is produced by means of a conventional process of twisting carried out with particular care and expressely in order to obtain by means of "spiraling" the final effect of the thread of viscose which embodies the nylon-carbon component.
- the yarn of the invention is shown schematically with 1 and 2 indicating two threads of rayon of equal characteristics and with 3 indicating a thread of nylon-carbon which is "spiraled" with threads 1 and 2.
- the negative characteristics of the nylon-carbon thread can not be noted and aesthetically a light, grey effect, which can not be eliminated given that it is possible neither to color nor discolor the carbon fiber, is vaguely seen inside the yarn.
- the attenuation factor in decibels as a function of the frequency of measurements executed in the interval 50 - 300x103 Hz is shown in the diagram in figure 2.
- the attenuation factor in decibels is defined by the equation 20log E2/E1 where E1 and E2 measure respectively the intensity of the electromagnetic field in the presence and in the absence of the screen of knitted fabric.
- the fabric has screening properties inversely proportional to the frequency of irradiation.
- the screening effect becomes negligible, whereas it is appreciable and consistent in the presence of medium-low frequency field.
- the attenuation factor at 50-60 Hz is not lower than 30 dB, corresponding to an attenuation of the intensity of the electromagnetic field higher than 30 times.
- Yarns according to the invention can also be made wherein the base yarn is in wool or cotton or other natural fibers which are compatible, both from a technological and economic point of view, or with artificial fibers.
- the yarn according to the invention can also utilize threads of a mixed base also comprising synthetic yarns, for example nylon or acrylics.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Knitting Of Fabric (AREA)
Abstract
A yarn for the production of knitted articles having good properties of attenuation of low frequency and medium frequency electromagnetic fields. The yarn comprises a base yarn (1,2) made of natural or artificial fiber, such as cotton, wool, rayon and the like, to which a carbon yarn (3) is embodied in a percentage not lower than 1%. The attenuation of the intensity of the electromagnetic field at 50-60 Hz is higher than 30 times.
Description
- The present invention relates to the field of yarns for knitted products and more precisely to a yarn for the production of knitted articles able to screen the body of the person wearing them from electromagnetic waves by attenuating electromagnetic fields of low and medium frequency.
- The risk connected with the exposure of living organisme to electromagnetic radiation especially when of high frequency is well known to experts in the field. Said exposure can have even lethal consequences. Although not immediately damaging, the radiation associated with magnetic fields of low and medium frequency, the sources of which are widespread in all environments (home, work, amusement), are considered a possible cause of many and sometimes serious physical and psychosomatic disturbances (insomnia, headaches, loss of appetite and concentration, stress) and it is suspected that prolonged exposure to them can increase the risk of development of certain type of tumours.
- In the fabric field materials have been made which are able to absorb and dissipate electrostatic energy and can be used in the manufacture of work garments for special environment, for example shirts to wear in aseptic environments in which a total absence of dust must be assured. The characteristic of not being static is given to these fabrics by the presence in their fiber of small percentages of carbon yarn. With the object of absorbing electrostatic energy, carbon fabrics are used in articles of interior decorations such as carpets.
- It has now been found, and this constitutes the object of the present invention, that the addition of at least 1% by weight of a carbon yarn to a knitting yarn made of essentially, natural or artificial fibers such as wool, cotton, rayon and the like, gives the knitted articles made with said yarns good attenuating properties with respect to electromagnetic fields of low and medium frequency avoiding, or at least limiting, the absorption of electromagnetic waves on the part of the person wearing the garment thus favoring physical well-being as well as reducing the risk of the development of the above-mentioned disturbances.
- For the production of the yarn according to the invention a carbon yarn of commercial type, the socalled "nylon-carbon", composed of a support in nylon to which the carbon is anchored, is preferably used.
- In a particular preferred embodiment of the invention, suited in particular for making lightweight knitted clothing for spring and summer, a base yarn, rayon viscose, chosen for its characteristics of fluidity and silkiness, was combined with 4 to 7% of nylon-carbon yarn. Said combination proved optimum for summer clothing to be worn in direct contact with the skin since rayon viscose, being fluid and silky, compensates for the apperance and feel of the carbon yarn which, otherwise, would be too rigid and rough to be worn in contact with the skin.
- To obtain said result, the yarn according to the invention, is produced by means of a conventional process of twisting carried out with particular care and expressely in order to obtain by means of "spiraling" the final effect of the thread of viscose which embodies the nylon-carbon component.
- Strictly as an example and not limitative, in figure 1, the yarn of the invention is shown schematically with 1 and 2 indicating two threads of rayon of equal characteristics and with 3 indicating a thread of nylon-carbon which is "spiraled" with
threads - With the object of evaluating the effective capacity for attenuating electromagnetic fields with the yarn according to the invention, measurements of attenuation in an anechoic chamber and in a TEM cell were carried out respectively in the range of
frequencies 300 MHz - 1 GHz and in therange 100 kHz - 300 MHz. The tests were carried out on pieces of knitted fabric made with the yarn according to the invention, containing 6% nylon-carbon yarn. - In the measurements taken in the anechoic chamber, a 2mx2m square piece of knitted fabric was used placed between the beam of radiation and the probe. In the TEM cell, the probe was instead covered with a square of knitted fabric of 1mx1m.
- The attenuation factor in decibels as a function of the frequency of measurements executed in the interval 50 - 300x10³ Hz is shown in the diagram in figure 2. The attenuation factor in decibels is defined by the equation 20log E2/E1 where E1 and E2 measure respectively the intensity of the electromagnetic field in the presence and in the absence of the screen of knitted fabric.
- From the tests it results that the fabric has screening properties inversely proportional to the frequency of irradiation. In fact the screening capacity of the electromagnetic field ranges from 8 dB (E2/E1=2.51) at 0.1 MHz to 0 dB (E2/E1=1) from 300 MHz up. In other words, already at 100 Mhz the screening effect becomes negligible, whereas it is appreciable and consistent in the presence of medium-low frequency field.
- In particular the attenuation factor at 50-60 Hz is not lower than 30 dB, corresponding to an attenuation of the intensity of the electromagnetic field higher than 30 times.
- Yarns according to the invention can also be made wherein the base yarn is in wool or cotton or other natural fibers which are compatible, both from a technological and economic point of view, or with artificial fibers. The yarn according to the invention can also utilize threads of a mixed base also comprising synthetic yarns, for example nylon or acrylics.
- Variations and/or modifications can be brought to the yarn for knitted products according to the present invention without departing from the scope of the appended claims.
Claims (5)
- A yarn for the production of knitted articles able to attenuate electromagnetic fields of low and medium frequency characterized by the fact that it is formed essentially by natural or artificial yarn containing a carbon yarn in a percentage by weight of not less than 1%.
- Yarn according to claim 1, wherein the percentage by weight of carbon yarn is comprised between 4 and 7%.
- Yarn according to claim 2, wherein the percentage by weight of the carbon yarn is equal to 6%.
- Yarn according to the previous claims, wherein said carbon and yarn is in nylon-carbon yarn.
- Yarn according to the previous claims, wherein said essentially natural or artificial yarn, is chosen from among wool, cotton, rayon-viscose and the like.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITFI920007 | 1992-01-16 | ||
ITFI920007A IT1258341B (en) | 1992-01-16 | 1992-01-16 | YARN FOR THE PRODUCTION OF KNITWEAR ITEMS THAT CAN REDUCE LOW AND MEDIUM FREQUENCY ELECTROMAGNETIC FIELDS |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0553063A1 true EP0553063A1 (en) | 1993-07-28 |
Family
ID=11349892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93830007A Withdrawn EP0553063A1 (en) | 1992-01-16 | 1993-01-13 | A yarn for the production of knitted articles able to attenuate low and medium frequency electromagnetic fields |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0553063A1 (en) |
JP (1) | JPH05247763A (en) |
IT (1) | IT1258341B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102899763A (en) * | 2012-05-18 | 2013-01-30 | 新乡市新诚纺织有限公司 | Silk wadding curved bead wire and preparation method thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1986003050A1 (en) * | 1984-11-13 | 1986-05-22 | Raychem Corporation | Shielding fabric and article |
JPS61239044A (en) * | 1985-04-11 | 1986-10-24 | 旭化成株式会社 | Conductive fiber material |
JPH0359129A (en) * | 1989-07-25 | 1991-03-14 | Nakatsu Shiko Kk | Electromagnetic wave shielding material |
JPH0397932A (en) * | 1989-03-25 | 1991-04-23 | Toyobo Co Ltd | Conjugated yarn for electromagnetic wave-shielding molding material, molding material containing the same and molded article |
JPH03152229A (en) * | 1989-11-10 | 1991-06-28 | Mie Pref Gov | Conjugate yarn |
-
1992
- 1992-01-16 IT ITFI920007A patent/IT1258341B/en active IP Right Grant
-
1993
- 1993-01-13 EP EP93830007A patent/EP0553063A1/en not_active Withdrawn
- 1993-01-14 JP JP5005264A patent/JPH05247763A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1986003050A1 (en) * | 1984-11-13 | 1986-05-22 | Raychem Corporation | Shielding fabric and article |
JPS61239044A (en) * | 1985-04-11 | 1986-10-24 | 旭化成株式会社 | Conductive fiber material |
JPH0397932A (en) * | 1989-03-25 | 1991-04-23 | Toyobo Co Ltd | Conjugated yarn for electromagnetic wave-shielding molding material, molding material containing the same and molded article |
JPH0359129A (en) * | 1989-07-25 | 1991-03-14 | Nakatsu Shiko Kk | Electromagnetic wave shielding material |
JPH03152229A (en) * | 1989-11-10 | 1991-06-28 | Mie Pref Gov | Conjugate yarn |
Non-Patent Citations (4)
Title |
---|
DATABASE WPIL Section Ch, Week 8649, Derwent Publications Ltd., London, GB; Class F07, AN 86-322449 & JP-A-61 239 044 (ASAHI CHEMICAL IND.) 24 October 1986 * |
DATABASE WPIL Section Ch, Week 9117, Derwent Publications Ltd., London, GB; Class F02, AN 91-120699 & JP-A-3 059 129 (NAKATUSHIKO) 14 March 1991 * |
DATABASE WPIL Section Ch, Week 9122, Derwent Publications Ltd., London, GB; Class F01, AN 91-161262 & JP-A-3 097 932 (TOYOBO) 23 April 1991 * |
DATABASE WPIL Section Ch, Week 9132, Derwent Publications Ltd., London, GB; Class F02, AN 91-234188 & JP-A-3 152 229 (KOWABOSEKI ET AL.) 28 June 1991 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102899763A (en) * | 2012-05-18 | 2013-01-30 | 新乡市新诚纺织有限公司 | Silk wadding curved bead wire and preparation method thereof |
CN102965782A (en) * | 2012-05-18 | 2013-03-13 | 新乡市新诚纺织有限公司 | Silk-floss single-twist bead yarn and preparation method thereof |
CN102899763B (en) * | 2012-05-18 | 2015-01-07 | 新乡市新诚纺织有限公司 | Silk wadding curved bead wire and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
IT1258341B (en) | 1996-02-26 |
ITFI920007A1 (en) | 1993-07-16 |
ITFI920007A0 (en) | 1992-01-16 |
JPH05247763A (en) | 1993-09-24 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES FR GB |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19940129 |