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GB2448763A - Laser sensitive textile - Google Patents

Laser sensitive textile Download PDF

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Publication number
GB2448763A
GB2448763A GB0708207A GB0708207A GB2448763A GB 2448763 A GB2448763 A GB 2448763A GB 0708207 A GB0708207 A GB 0708207A GB 0708207 A GB0708207 A GB 0708207A GB 2448763 A GB2448763 A GB 2448763A
Authority
GB
United Kingdom
Prior art keywords
laser
yarn
sensitive
textile
radiation
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Withdrawn
Application number
GB0708207A
Other versions
GB0708207D0 (en
Inventor
Zahir Ahmed
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to GB0708207A priority Critical patent/GB2448763A/en
Publication of GB0708207D0 publication Critical patent/GB0708207D0/en
Publication of GB2448763A publication Critical patent/GB2448763A/en
Withdrawn legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00Processes of treating or compounding macromolecular substances
    • C08J3/20Compounding polymers with additives, e.g. colouring
    • C08J3/201Pre-melted polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/267Marking of plastic artifacts, e.g. with laser
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/0008Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0041Optical brightening agents, organic pigments
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06HMARKING, INSPECTING, SEAMING OR SEVERING TEXTILE MATERIALS
    • D06H1/00Marking textile materials; Marking in combination with metering or inspecting
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02Forms or constructions
    • G09F3/0291Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
    • G09F3/0294Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time where the change is not permanent, e.g. labels only readable under a special light, temperature indicating labels and the like

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Textile Engineering (AREA)
  • Materials Engineering (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Woven Fabrics (AREA)

Abstract

A label comprises a textile material, having at least a portion which comprises a laser sensitive yarn. The yarn is configured such that exposure of the yarn to laser radiation of a predetermined type modifies an optical property of the yam without burning or scorching, to provide visible contrast between a portion of the yarn exposed to the laser radiation and a portion of the yarn not exposed. The textile is preferably woven and the warp or weft yarns may be laser sensitive. The optical property, such as colour or reflectivity, is preferably only altered when the intensity of the laser exceeds that of direct sunlight. A low powered carbon dioxide laser is preferred. The yarn may comprise a fibre coated with a laser sensitive material, such as a dye, before or after weaving or a fibre having a laser sensitive material incorporated within at the melt stage. The fibre may be any mix of polypropylene, polyamide or polyester. The laser sensitive material may be EVA (ethylene vinyl acetate). The textile material may have a security code, alphanumeric character, bar code or graphical image produced thereon by exposure to laser radiation.

Description

I
TEXTILE MARKING APPARATUS AND METHOD
Field of the Invention
The present invention relates to textile marking apparatus and a method of marking textiles. In particular, but not exclusively, the invention relates to a method of marking textiles with a security code.
Background
A number of different technologies are currently used for marking textiles with security labels and/or codes. For example, a marking may be woven into the textile material during manufacture of the material, such as by means of one or more weft threads of contrasting colour with another weft thread. Alternatively, the marking may be printed onto the textile using an ink after the textile manufacturing process is complete. I... * * *S*S
The process of marking by weaving a weft thread of contrasting colour into the cloth requires special equipment typically including a computer control system. Furthermore, since the textile is marked during the process of manufacture, the code marked on the " textile must be known at the time of manufacture, and cannot be subsequently changed easdy.
Marking of a textile by printing using an ink requires printing equipment in addition to textile manufacturing equipment. The ink used must be of high grade in order to resist deterioration during washing or exposure to light, which may result in fading of the textile. The process of printing is also relatively slow. Labels produced by printing typically take longer to make than labels produced by weaving alone.
In a first aspect of the present invention there is provided a label comprising a textile material, wherein at least a portion of the textile comprises a laser sensitive yarn, the yarn being configured such that exposure of the yarn to laser radiation of a predetermined type modifies an optical property of the yarn, not burning or scorching the yarn, thereby to provide visible contrast between a portion of the yarn exposed to the laser radiation and a portion of the yam not exposed to laser radiation.
The yarn may for example be in the form of a single fibre or a plurality of spun or bonded fibres.
Embodiments of the invention have the advantage that the textile may be conveniently marked after manufacture without a requirement for printing equipment. Furthermore, since no ink or other substance is required to be applied to the textile by the marking apparatus, the problem of fading or removal of the ink, for example during washing of the textile, does not arise.
The fact that little or no burning or scorching of the textile occurs as a result of the process results in a textile that has no degradation in strength, surface texture or other physical properties. Furthermore, the textile is not rendered unsightly as a consequence of burning or scorching.
Labels according to embodiments of the invention have the advantage that they are *.** difficult to copy. Thus, they are ideally suited to use as anti-counterfeit devices. Labels incorporating laser-sensitive material and marked using a laser beam can be readily *1* distinguished from labels not incorporating laser-sensitive material. For example, they may be distinguished by inspection to determine the presence or absence of laser markings according to the present invention. Alternatively, they may be exposed to laser radiation to determine whether a mark according to the present invention is formed A warp thread may comprise the laser-sensitive yarn. Alternatively or in addition, a weft thread may comprise the laser-sensitive yarn.
In the case that warp threads comprise the laser-sensitive yarn, the textile material may be marked at any location of the surface of the textile material. In the case that weft threads comprise the laser-sensitive material, the weft threads that comprise the laser-sensitive material may be introduced only in areas of the textile where it is required to mark the textile.
Preferably the yarn is arranged such that the optical property of the yarn is modified only when an intensity of the laser radiation exceeds a critical intensity.
Preferably the critical intensity of the laser radiation exceeds an intensity of direct sunlight.
This has the advantage that the laser-sensitive yarn will not change colour when irradiated by direct sunlight.
Preferably the optical property modified by the laser is the colour of the laser-sensitive yarn. This has the advantage that laser-irradiated areas of the textile may be readily distinguished from non laser-irradiated areas.
Preferably, laser radiation of the predetermined type comprises radiation produced by a carbon dioxide laser.
Preferably laser radiation of the predetermined type is produced by a carbon dioxide laser operated at a power level of at least lOW. *
S.....
In some embodiments a different kind of laser is used to produce laser radiation of a predetermined type, appropriate to a given laer-sensitive yam. For example, in some embodiments UV laser radiation is employed, generated by a laser source such as a *S Nd:YAG laser. * ..* * . S.
Laser radiation of the predetermined type may include laser radiation of a particular * .5.
frequency or of a particular range of frequencies. In some embodiments laser radiation...
of the predetermined type includes laser radiation of more than one frequency or range of frequencies. In some embodiments of the invention laser radiation of the predetermined type indudes laser radiation of a predetermined intensity and laser radiation of a predetermined pulse length and/or pulse repetition rate.
The laser-sensitive yarn may comprise a fibre coated with a laser-sensitive material.
This has the advantage that existing non laser-sensitive fibres may be given a laser-sensitive property by coating them with laser-sensitive material.
The laser-sensitive yarn may comprise a fibre coated with the laser-sensitive material before weaving of the textile.
This feature has the advantage that post-weaving coating, such as by dyeing, is not necessary. Post-weaving coating has the disadvantage that at least a portion of the garment must be subjected to a coating process, such as by dipping in a dye. In the case of dyeing, the garment must be dried following the dyeing process. A drying process requires time and typically requires drying equipment. Furthermore, the risk exists that the dyeing process will result in uneven dyeing and hence an unsightly appearance of the textile.
Dyeing of a yarn before weaving a textile, as opposed to dyeing of a textile following a weaving process has the advantage that in some embodiments the yarn may be dried more quickly than in the case of drying of a woven textile.
Alternatively or in addition the laser-sensitive yam may comprise a fibre coated with the laser-sensitive material after weaving of the textile.
Alternatively or in addition the laser-sensitive yarn may comprise a fibre having laser-sensitive material therein. S... S...
This has the advantage that as the fibre wears, fresh laser-sensitive material is exposed.
Therefore the label does not fade as the fibre wears.
In the case of a fibre having only a laser-sensitive coating, as the fibre wears it may lose S...
its coating and hence the laser-sensitive dye. Therefore fading of the label may occur.
The laser sensitive yam may comprise a laser-sensitive dye.
The laser sensitive material may comprise ethylene vinyl acetate.
A label as claimed in any preceding claim comprising a portion that has been exposed to laser radiation of the predetermined type and a portion that has not been exposed to laser radiation of the predetermined type.
Preferably the portion exposed to laser radiation of the predetermined type corresponds to a security label.
The security label may comprise an invisible marking provided on the label.
A label may comprise a portion exposed to laser radiation of the predetermined type and a corresponding invisible marking.
In a second aspect of the invention there is provided an article comprising a label according to the first aspect of the invention.
In a third aspect of the invention there is provided a weaving loom wherein a warp or weft thread comprises a laser-sensitive yam, the laser-sensitive yarn being configured such that exposure of the laser-sensitive yarn to laser radiation of a predetermined type modifies an optical property of the laser-sensitive yarn, thereby to provide visible contrast between a portion of the laser-sensitive yarn exposed to the laser radiation and a portion of the laser-sensitive yarn not exposed to laser radiation. * ***S*
In a fourth aspect of the invention there is provided textile marking apparatus comprising:*..*. *.**
a weaving loom according to the third aspect of the invention and a carbon dioxide laser. * S..
In a fifth aspect of the invention there is provided a method of marking a textile * comprising the steps of: providing a laser-sensitive yarn, the laser-sensitive yarn being configured such m.
that exposure of the laser-sensitive yarn to laser radiation of a predetermined type modifies an optical property of the laser-sensitive yarn, thereby to provide visible contrast between a portion of the laser-sensitive yarn exposed to the laser radiation and a portion of the laser-sensitive yarn not exposed to the laser radiation; and weaving a textile material comprising the laser-sensitive yarn.
In a sixth aspect of the invention there is provided a method of manufacturing a laser- sensitive fibre comprising the steps of: forming a melt of a plastics material and a laser-sensitive dye; extruding the melt to form a fibre, whereby the fibre is configured such that exposure of the laser-sensitive fibre to laser radiation of a predetermined type modifies an optical property of the laser-sensitive fibre, thereby to provide visible contrast between a portion of the laser-sensitive fibre exposed to the laser radiation and a portion of the laser-sensitive fibre not exposed to the laser radiation.
In a seventh aspect of the invention there is provided a laser-sensitive yarn wherein at least a portion of a length of the yarn is configured such that exposure of said portion to laser radiation of a predetermined type modifies an optical property of said portion thereby to provide visible contrast between said portion of the length exposed to laser radiation and a portion of said length not exposed to laser radiation.
In an eighth aspect of the invention there is provided a laser-sensitive yarn configured such that exposure of a region of the yarn to radiation of a predetermined type modifies an optical property of said region thereby to provide visible contrast between said region exposed to laser radiation and a region not exposed to laser radiation, the yarn comprising a portion that has been exposed to radiation of the first type and a portion that has not been exposed to radiation of the first type.
In a ninth aspect of the invention there is provided a method of manufacturing a textile comprising a laser-sensitive yam, the laser-sensitive yam being configured such that exposure of the laser-sensitive yarn to laser radiation of a predetermined type modifies:..:.
an optical property of the laser-sensitive yam, thereby to provide visible contrast between a portion of the laser-sensitive yarn exposed to the laser radiation and a portion of the laser-sensitive yarn not exposed to laser radiation, comprising the steps of: forming a textile whereby at least one selected from amongst a warp thread and a weft.:: thread comprises a laser-sensitive yam; and exposing a portion of the textile to laser radiation of the predetermined type thereby to change a colour of the textile. S....' Embodiments of the invention will now be described with reference to the accompanying figure in which: FIGURE 1 shows apparatus for manufacturing a label according to an embodiment of the invention.
According to a first embodiment of the invention a label 20 may be produced by apparatus 10 as shown in FIG. 1. The label 20 comprises a textile material 21 formed by weaving a weft thread 24 of laser-sensitive yarn (or fibre') and a warp thread 22 of non laser-sensitive yarn. The apparatus 10 includes a laser scanning module 40. The scanning module 40 is employed to scan a laser beam across the textile material 21 as the textile material 21 is moved past the scanning module 40. The textile material 21 is then wound onto a drum 30. The laser scanning module 40 selectively exposes the textile material 21 to laser radiation, producing a marking in the textile according to the requirements of the user.
A laser-sensitive yarn has the property that portions that have not been exposed to laser radiation may be distinguished from portions that have been exposed to laser radiation.
According to some embodiments of the invention the distinction may be readily made by optical inspection. According to the present embodiment, exposed and non-exposed portions may be readily distinguished using the naked eye since respective exposed and non-exposed portions of the textile are of different colour.
In other words, in the case of a textile woven using laser-sensitive yarn, visible contrast is present between portions of the textile exposed to laser radiation, and portions of the textile not exposed to laser radiation.
Laser-sensitive yarn (or fibre) according to the present embodiment is produced by extrusion of a melt of plastics material mixed with laser-sensitive dye. The plastics:..:.
material is a mixture of polypropylene and polyamide. In alternative embodiments the plastics material is polyester, polypropylene, or a mixture of any two or more of polypropylene, polyamide, polyester and polypropylene. In further embodiments the plastics material is any other suitable plastics material or combination of plastics.:: materials. *...
S S S...
The laser-sensitive material is an ethylene vinyl acetate (EVA) polymer masterbatch.
obtained from DataLase' Ltd, UK (Packmarkm' Masterbatch). In alternative embodiments, any other suitable laser-sensitive material may be used.
In some embodiments of the invention, a laser-sensitive yarn is fabricated by coating fibres for weaving with a laser-sensitive dye, instead of or in addition to forming the fibre from a melt of plastics material mixed with laser-sensitive dye. In the case that the laser-sensitive material is not compatible with the melt of plastics material, the laser-sensitive material may be coated onto fibre instead of being mixed with the melt of plastics material.
Mixing of the laser-sensitive material with the melt before extrusion of a fibre has the advantage that the laser-sensitive material is present not only at the surface of the fibre, where it is vulnerable to abrasion and wear, but also within the fibre. Thus, as the fibre wears, during use, fresh laser-sensitive material is exposed. In embodiments of the invention laser-sensitive material below the surface of the fibre experiences the same colour change as laser-sensitive material at the surface of the fibre when the fibre is exposed to laser radiation. Therefore, as the fibre wears, the laser-sensitive material (and hence a mark made on the textile due to irradiation by the laser) remains visible.
The penetration depth of a laser beam into a material will depend upon the transparency of the material at the particular wavelength of the laser beam. In the case of a laser emitting laser radiation of a wavelength of around 10.6j.tm, the penetration depth exceeds lOOMm for many polymers including poly(ethyleneterephthalate), polypropylene and polyamide. The penetration depth therefore corresponds to a length that is typically equal to at least half of the diameter of a filament (fibre) of a yarn. Thus, a colour of a laser-sensitive material contained within a filament of a yarn is changed upon irradiation of the yarn by a laser beam of a suitable wavelength.
In the preferred embodiment of the invention, the textile is exposed to laser radiation...:.
using a low-power CO2 laser 40. In alternative embodiments of the invention any **** suitable radiation source may be used. a
S
Following the process of weaving of the textile material 20, the textile material is wound.
onto a drum 30 for storage. S... *...
The use of a laser-sensitive dye has a number of advantages. For example, the dye may be configured (as in the case of the present embodiment) such that the textile may only be marked when subjected to a beam of laser radiation of an intensity exceeding a critical intensity thereby to cause a colour change of the laser-sensitive material. This intensity will depend upon the type (eg composition) of the laser-sensitive material.
Thus, a laser-sensitive dye may be selected for which the intensity of light required to effect a colour change exceeds that to which the textile may be expected to be exposed during the useful lifetime of the textile. Thus, a risk of unintentional marking of a textile comprising the laser-sensitive dye, for example by exposure of the textile to sunlight, or other radiation sources commonly experienced by a textile, is reduced.
Furthermore, a requirement for laser scanning equipment in the case of some embodiments of the invention reduces the ease with which a counterfeiting operation may be established.
According to an embodiment of the invention, a textde woven from a laser-sensitive yarn is marked by a laser so as to change the colour of the yarn. For the present purposes, reference to colour includes reference to black' and white'.
In alternative embodiments, the textile is marked by changing another optical property of the yarn, such as a reflectivity of the yarn.
The textile may be marked by a laser to form any suitable marking such as alphanumeric markings, barcode markings, or any other suitable markings or indicia.
A textile according to the present embodiment is formed with a weft thread of laser-sensitive material. The weft thread is introduced only in regions where it is desirable to mark the textile using a laser. In some embodiments a weft thread of laser-sensitive:,.:.
material is used throughout the textile material.
In alternative embodiments of the invention, a textile is formed with warp threads of *:.
laser-sensitive material. In this case, the textile may be marked at substantially any.:: location across a surface of the textile. *...
S S S...
Embodiments of the invention have the advantage that a fibre of laser-sensitive material is used as a replacement for a warp and/or weft fibre of non-laser-sensitive material that would otherwise be used to form the textile. Consequently, the thickness of the textile is not increased by incorporating a laser-sensitive fibre into the textile. This is in contrast to other labelling techniques in which an extra fibre is introduced into the textile in order to form a label. The extra fibre is of a different colour to the other fibres of the textile, in order to provide contrast between the extra fibre and the remaining fibres of the textile, thereby to form a label.
It will be appreciated that in some embodiments of the invention, exposure of a textile according to the present invention to radiation in order to change a colour of the textile is performed in order to provide a decorative effect, instead of or in addition to producing a security label. For example, an image may be formed on a garment such as a T-shirt, a table cloth, car upholstery or other article comprising a textile material.
Throughout the description and claims of this specification, the words "comprise" and "contain" and variations of the words, for example "comprising" and "comprises", means Including but not limited to, and is not intended to (and does not) exclude other moieties, additives, components, integers or steps.
Throughout the description and claims of this specification, the singular encompasses the plural unless the context otherwise requires. In particular, where the indefinite article is used, the specification is to be understood as contemplating plurality as well as singularity, unless the context requires otherwise.
Features, integers, characteristics, compounds, chemical moieties or groups described in conjunction with a particular aspect, embodiment or example of the invention are to be understood to be applicable to any other aspect, embodiment or example described herein unless incompatible therewith. * * S....
S *5** * . S... * S.. * ... * S *
S S... * . S...
S *.

Claims (39)

  1. CLAIMS: 1. A label comprising a textile material, wherein at least a
    portion of the textile comprises a laser sensitive yarn, the laser-sensitive yarn being configured such that exposure of the laser-sensitive yam to laser radiation of a predetermined type modifies an optical property of the yarn, not burning or scorching the yarn, thereby to provide visible contrast between a portion of the laser-sensitive yam exposed to the laser radiation and a portion of the laser-sensitive yarn not exposed to laser radiation.
  2. 2. A label as claimed in claim I wherein a warp thread comprises the laser-sensitive yarn.
  3. 3. A label as claimed in claim I or claim 2 wherein a weft thread comprises the..:.
    laser-sensitive yarn. *
  4. 4. A label as claimed in claim 1 wherein the yarn is arranged such that the optical * property of the laser-sensitive yarn is modified only when an intensity of the laser.: radiation exceeds a critical intensity. S.. S * S...
  5. 5. A label as claimed in claim 4 wherein the critical intensity of the laser radiation ** exceeds an intensity of direct sunlight.
  6. 6. A label as claimed in any preceding claim wherein the optical property of the laser-sensitive yarn modified by the laser is the colour of the laser-sensitive yarn.
  7. 7. A label as claimed in any preceding claim wherein laser radiation of the predetermined type comprises radiation produced by a carbon dioxide laser.
  8. 8. A label as claimed in claim 7 wherein laser radiation of the predetermined type is produced by a carbon dioxide laser operated at a power level of at least low.
  9. 9. A label as claimed in any preceding claim wherein the laser-sensitive yarn comprises a fibre coated with a laser-sensitive material.
  10. 10. A label as claimed in claim 9 wherein the laser-sensitive yarn comprises a fibre coated with the laser-sensitive material before weaving of the textile.
  11. 11. A label as claimed in claim 9 or claim 10 wherein the laser-sensitive yarn comprises a fibre coated with the laser-sensitive material after weaving of the textile.
  12. 12. A label as claimed in any preceding claim wherein the laser-sensitive yarn comprises a fibre having laser-sensitive material therein.
  13. 13. A label as claimed in any one of claims 9 to 12 wherein the laser sensitive yam comprises a laser-sensitive dye.
  14. 14. A label as claimed in any one of claims 9 to 13 wherein the laser sensitive material comprises ethylene vinyl acetate. * *
  15. 15. A label as claimed in any preceding claim comprising a portion exposed to laser S..
    radiation of the predetermined type, wherein said portion corresponds to a security marking. .:. * S*S * S S
  16. 16. A label as claimed in claim 15 further comprising an invisible marking. *5S* * *5**
  17. 17. A label as claimed in claim 16 wherein the portion exposed to laser radiation of the predetermined type corresponds to the invisible marking.
  18. 18. An article comprising a label as claimed in any preceding claim.
  19. 19. A weaving loom wherein a warp or weft thread comprises a laser-sensitive yarn, the laser-sensitive yarn being configured such that exposure of the laser-sensitive yarn to laser radiation of a predetermined type modifies an optical property of the yarn, not burning or scorching the yarn, thereby to provide visible contrast between a portion of the laser-sensitive yarn exposed to the laser radiation and a portion of the laser-sensitive yam not exposed to laser radiation.
  20. 20. Textile marking apparatus comprising a weaving loom as claimed in claim 19 and a carbon dioxide laser.
  21. 21. A method of marking a textile comprising the steps of: providing a laser-sensitive yam, the laser-sensitive yarn being configured such that exposure of the laser-sensitive yam to laser radiation of a predetermined type modifies an optical property of the yarn, not burning or scorching the yarn, thereby to provide visible contrast between a portion of the laser-sensitive yarn exposed to the laser radiation and a portion of the laser-sensitive yarn not exposed to laser radiation; and weaving a textile material comprising the laser-sensitive yarn.
  22. 22. A method as claimed in claim 21 further comprising the step of exposing at least a portion of the textile to laser radiation thereby to form a mark in an area of the textile comprising the laser-sensitive yarn.
  23. 23. A method of manufacturing a laser-sensitive fibre comprising the steps of: forming a melt of a plastics material and a laser-sensitive dye; extruding the melt to form a fibre, whereby the fibre is configured such that exposure of the laser-sensitive fibre to *.
    laser radiation of a predetermined type modifies an optical property of the yarn, not.:: burning or scorching the yarn, thereby to provide visible contrast between a portion of the laser-sensitive fibre exposed to the laser radiation and a portion of the laser-sensitive..*.*.
    fibre not exposed to laser radiation.
  24. 24. A laser-sensitive yarn wherein at least a portion of a length of the yarn is configured such that exposure of said portion to laser radiation of a predetermined type modifies an optical property of the yarn, not burning or scorching the yarn, thereby to provide visible contrast between said portion of the length exposed to laser radiation and a portion of said length not exposed to laser radiation.
  25. 25. A laser-sensitive yarn wherein said length of the yam comprises a fibre coated with a laser-sensitive material, the laser-sensitive yarn being configured such that exposure of the laser-sensitive yam to laser radiation of a predetermined type modifies an optical property of the yarn, not burning or scorching the yarn, thereby to provide visible contrast between a portion of the laser-sensitive yarn exposed to the laser radiation and a portion of the laser-sensitive yarn not exposed to laser radiation.
  26. 26. A laser-sensitive yarn as claimed in claim wherein 24 or claim 25 wherein the laser-sensitive yarn comprises a fibre having laser-sensitive material therein.
  27. 27. A laser-sensitive yarn configured such that exposure of a region of the yarn to radiation of a predetermined type modifies an optical property of the yarn, not burning or scorching the yarn, thereby to provide visible contrast between said region exposed to laser radiation and a region not exposed to laser radiation, the yarn comprising a portion that has been exposed to radiation of the first type and a portion that has not been exposed to radiation of the first type.
  28. 28. A method of manufacturing a textile comprising a laser-sensitive yarn, the laser-sensitive yarn being configured such that exposure of the laser-sensitive yam to laser radiation of a predetermined type modifies an optical property of the yarn, not burning or scorching the yarn, thereby to provide visible contrast between a portion of the laser-sensitive yarn exposed to the laser radiation and a portion of the laser-sensitive yarn not...:.
    exposed to laser radiation, comprising the steps of: S...
    forming a textile whereby at least one selected from amongst a warp thread and a weft thread comprises a laser-sensitive yam; * exposing a portion of the textile to laser radiation of the predetermined type.
    thereby to change a colour of the textile. 5.55
    S S S...
  29. 29. A method as claimed in claim 28 whereby said portion of the textile exposed to laser radiation corresponds to a security code.
  30. 30. A method as claimed in claim 28 or claim 29 whereby said portion of the textile exposed to laser radiation comprises at least one selected from amongst an alphanumeric character and a barcode.
  31. 31. A method as claimed in any one of claims 28 to 30 whereby said portion of the textile corresponds to a graphical image.
  32. 32. A label substantially as hereinbefore described with reference to the accompanying drawings.
  33. 33. An article substantially as hereinbefore described with reference to the accompanying drawings.
  34. 34. A weaving loom substantially as hereinbefore described with reference to the accompanying drawings.
  35. 35. Textile marking apparatus substantially as hereinbefore described with reference to the accompanying drawings.
  36. 36. A method of marking a textile substantially as hereinbefore described with reference to the accompanying drawings.
  37. 37. A method of manufacturing a laser-sensitive fibre substantially as hereinbefore described with reference to the accompanying drawings.
  38. 38. A laser sensitive yarn substantially as hereinbefore described with reference to:...:.
    the accompanying drawings.
  39. 39. A method of manufacturing a textile comprising a laser-sensitive yarn.
    substantially as heieinbefore described with reference to the accompanying drawings. * * S... S.. S * S
GB0708207A 2007-04-27 2007-04-27 Laser sensitive textile Withdrawn GB2448763A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0708207A GB2448763A (en) 2007-04-27 2007-04-27 Laser sensitive textile

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GB0708207D0 GB0708207D0 (en) 2007-06-06
GB2448763A true GB2448763A (en) 2008-10-29

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10051905B2 (en) 2016-08-19 2018-08-21 Levi Strauss & Co. Laser finishing of apparel
US10712922B2 (en) 2017-10-31 2020-07-14 Levi Strauss & Co. Laser finishing design tool with damage assets
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