AU2002224245A1 - Tag marking - Google Patents
Tag markingInfo
- Publication number
- AU2002224245A1 AU2002224245A1 AU2002224245A AU2424502A AU2002224245A1 AU 2002224245 A1 AU2002224245 A1 AU 2002224245A1 AU 2002224245 A AU2002224245 A AU 2002224245A AU 2424502 A AU2424502 A AU 2424502A AU 2002224245 A1 AU2002224245 A1 AU 2002224245A1
- Authority
- AU
- Australia
- Prior art keywords
- tag
- indicia
- heating
- laser
- approximately
- 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.)
- Abandoned
Links
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 20
- 238000010330 laser marking Methods 0.000 claims description 18
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims 1
- 239000000654 additive Substances 0.000 description 6
- 230000000996 additive effect Effects 0.000 description 6
- 241001465754 Metazoa Species 0.000 description 5
- 239000011888 foil Substances 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000007641 inkjet printing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
- G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
- G06K1/126—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching by photographic or thermographic registration
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K11/00—Marking of animals
- A01K11/001—Ear-tags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/267—Marking of plastic artifacts, e.g. with laser
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Birds (AREA)
- Zoology (AREA)
- Animal Husbandry (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Laser Beam Processing (AREA)
- Surgical Instruments (AREA)
- Holo Graphy (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
- Labeling Devices (AREA)
Description
Tag Marking
Field Of The Invention
The present invention relates to improvements and relating to tag marking and more particularly to tags which are marked with the relevant indicia by the use of I asers.
Background Of The Invention
For simplicity, the present invention will be described in respect of animal ear tags. However, it will be appreciated that the present invention has use in respect of ear tags or other identification items such as bracelets, labels or the like whether for use by animals, persons, or attachment to objects or the like.
The use of lasers to provide a permanent method of marking of plastic ear tags, and in particular tags of polyurethane, and polyamides (nylon), has been approved at least by the New Zealand authorities. Such laser marking provides a permanence extending at least for around 5 to 7 years.
To date, in moulding a thermoplastic polyurethane tag a laser additive will generally be included in the material mixture. Subsequently, when laser light is applied to the moulded tag, using a special laser marking machine, the laser additive will react with the laser light changing the colour of the tag material to a depth of around 0.1 mm typically.
It has been found that often the surface of the tag may be burnt trying to achieve a contrast of the marking or indicia to the base colour of the tag. Such burning is undesirable as it may destroy the polyurethane material which will affect its properties and this can limit the life of the tag.
To the present time, therefore, laser marking has typically been of a grey colour and this has been a disadvantage in being relatively non-distinctive as compared to a typical black marking which is achieved using a standard foil printed tag.
An associated problem is that the Regulatory Authorities at least in New Zealand are requiring the use of bar codes at least as part of the indicia. As such bar codes are not achievable using foil printing, it becomes even more important to utilise laser marking by which bar codes are able to be printed. Although ink jet printing is another possibility, this has a problem of not being permanent. Additionally, hot foil marked tags are generally not permanent and are typically only guaranteed for one year. A particular problem with hot foil marked tags is that the marking easily abrades from the tag surface.
In order to improve the contrast of existing laser created indicia, it has been suggested that foil printing or ink jet printing could be used over the laser mark. However, this results in a tag surface which is not smooth, is not easy to clean and/or attracts surface dirt.
Objects Of The Invention
It is therefore an object of the present invention to provide an improved laser marked tag (as herein defined) and/or a method of making such a tag which will overcome or at least ameliorate problems in laser marked and other tags available to the present time, or which at least will provide the public with a useful choice.
Further objects of this invention, which should be considered in all its novel aspects will become apparent from the following description.
Summary Of The Invention
According to one aspect of the present invention, there is thus provided a tag incorporating indicia which has been provided by a laser in which the contrast between the indicia and the tag material has been improved by heating the tag surface to a temperature sufficient to melt the surface and the laser indicia.
Preferably, the tag is of polyurethane and the temperature is between approximately 50°C and 500°C.
Optionally, following the heating, the tag may be quenched to prevent distortion of the tag surface.
Optionally, the quenching of the tag may be between a pair of relatively cold plate surfaces.
According to a further aspect of the present invention there is provided a tag incorporating indicia which has been provided by a laser and in which the contrast between the indicia and the tag material has been improved by the heating of the tag surface to a temperature sufficient to melt the surface and the indicia and wherein the indicia has one or more portions thereof raised above the surface and with at least one gap provided in or between the or each raised portion.
Preferably, part of the indicia material has also dispersed into the material below the surface.
Preferably the raised portion of the indicia includes a plurality of peaks and troughs defining a plurality of said gaps.
According to a still further aspect of the present invention, a method of laser marking a tag (as herein defined) includes:
(i) applying the required indicia by a laser to mark a tag surface; (ii) heating the surface to melt the surface and the indicia and blend the material together to improve the contrast of the indicia and the material.
Preferably, the above method further includes the use of a temperature of between approximately 50°C to 500°C.
Optionally, the above method may further include the quenching of the tag to seal the tag surface and prevent distortion of the tag surface.
Optionally, the above method may include the quenching between a pair of
relatively cold plates.
Preferably, the above method includes monitoring means to monitor the heating times and temperatures to prevent the tag surface from burning or over-melting.
According to a further aspect of the present invention there is provided a method of laser marking a tag including:
(i) Applying required indicia by a laser to mark a tag surface such that at least part of the indicia is raised above a surrounding surface with at least one gap therein;
(ii) Heating the surface to melt the surface and the indicia to blend the material together to improve the contrast of the indicia and the surrounding surface.
Preferably, the method as immediately above defined disperses part of the indicia material below the surface.
According to a still further aspect of the present invention, a laser marked tag and/or a method of laser marking a tag is substantially as herein described.
Further aspects of this invention, which should be considered in all its novel aspects will become apparent from the following description given by way of example of possible embodiments of the invention given by way of example and with reference to the accompanying drawings.
Brief Description Of The Drawings
Figure 1 : shows very diagrammatically a tag featuring laser marking according to one possible embodiment of the invention;
Figure 2: shows very diagrammatically a female animal ear tag according to a
further possible embodiment of the invention;
Figure 3: shows a greatly enlarged view of portion A of the ear tag of Figure 2; and
Figure 4: shows a part cross-sectional view through the indicia portion of the tag of Figures 2 and 3.
Brief Description Of Possible Embodiments Of The Invention
Referring to Figure 1 , a tag according to one possible embodiment of the invention is shown very diagrammatically. The tag 1 , (only the female tag being shown), is shown with a typical animal ear tag indicia, which would typically identify a particular animal, by an alpha numeric code, bar code, or the like. The tag 1 is of a plastics material, typically thermoplastic polyurethane (TPU) which will have had a suitable laser additive included in the plastics material when moulded.
Indicia 2 will then have been applied by use of a suitable laser marking machine whereby the laser additive will have reacted to the laser light, typically changing the colour of the marking to a grey colour to a depth of around 0.1 mm, this grey colour being substantially non-distinctive on many colours.
Following the laser marking of the indicia, the present invention heats the tag, preferably firstly on the side of the indicia, to a temperature of between 50 °C to 500 °C approximately, the temperature and its time of application being sufficient to melt the surface of the tag and the laser marking and then the material together, this providing a distinctive almost black colour to the mark. Optionally heat could be applied to both sides of the tag 1 simultaneously.
However a lesser heat input may be required for the non-indicia side of the tag 1 .
The heat input on this side is intended to flatten the tag and to make the appearance replicate that on the indicia side. The total heat input is controlled by the temperature used, the pressure applied, and its time of application.
Preferably the heating of the tag 1 may be by pressing a hat plate, or a pair of hot plates, against the surfaces of the tag 1. Alternatively a hot fluid, such as a gas may be applied t tHe surfaces,
Foliowmg the heating, the tag 1 may, optionally, In one embodiment, be quenched suitably between two polished oαld plates. This quenching Will seal the surface and prevent the distortion of the tag.
Suitable rrlbHUbHHfci neaHs will be provided to rribHltor the dwell ilrH , Mk pressure, ahd the tempordtures in order to prevent the tag surfaoe from burning1 or over- meltlHg.
It has been fouhcl thai following the application of the heating a s ooth polished surface is achieved, Such a smooth polished surface has the added benefit of readily shedding surfabe dl .
It has been further foiiHd.tHεJt Heating the tttø \ with the pprop iate WM Irføϋt may turn the laser marking almost blaok so as to provide a substantial contrast betWeen the tag colour and the indicia. It has also been found that the base tag colour has by the heating and/or quenching appeared to brighten, which again, enhances the contrast.
In further trial and experimentation, the applicant has, however, found that the final quality of the laser marking may be largely determined by the characteristics of the initial laser mark, and in particular, in providing the initial laser mark with at least a partially raised surface. In a further embodiment the present invention is able to provide even greater contrast and greater longevity when compared with a standard laser mark.
By raising the tag marking indicia above the general tag surface and preferably also dispersing the mark into the tag material below the surface this can provide a mark most suitable for enhancement with the process identified below. It has been found that the raising of the mark above the general surface of the order of 0.1 mm with about an additional 0.1 mm below the surface may be suitable in at least one embodiment. This may be achieved by a suitable pattern such as that of diagonal, circular, or vertical
lines defined by spaced apart troughs or gaps between adjacent peaks. The provision of one or more gaps in the mark allows the raised material to flow across the gap(s) when subsequently heated.
It has been found that the application under pressure of a very hot plate at a temperature of 50 ° C to 500 ° C for a suitable time, for example above 10ms for the lower temperature, suitably with the use of a barrier such as a PTFE barrier between the tag and the hot plate, can provide a suitable enhancing process, with the indicia being sealed flush with the tag surface, blending the peaks of the indicia and pushing more of the mark below the tag surface. The laser mark has also been found to react with the heat to turn almost black to improve its contrast with the surrounding material. It has been further found that the surface of the resultant mark may have enhanced resistance to abrasion in contrast with a standard laser marking. Any suitable surface finish can be provided whether this be smooth and glossy or patterned from a heated block with a textured finish.
In Figure 2, a typical female ear tag 1 is shown with numerical indicia 2. The area A is then shown enlarged in Figure 3 with the indicia defining a generally raised area 3 and being provided as a plurality of peaks 4 with intermediate gaps or troughs 6 raised above the base surface 5 of the tag 1 .With particular reference to Figure 4, the distance between arrows X-X i.e. the depth below the surface 5 of the tag 1 could, for example, be approximately 0.1 mm, whereas the distance between Y-Y could be approximately 0.2mm, i.e. the height of the indicia peaks 4 above the base surface 5 is sapproximately 0.1 mm. The gaps 6 between the peaks 4 could be of the order of 0.3mm. These dimensions are given merely by way of example only.
Although the peaks 4 are shown in Figure 2 providing a diagonal pattern, as mentioned previously, any type of surface or pattern may be provided as appropriate.
It has been found that this embodiment of the present invention enables a highly reactive laser additive to be used and that the enhancement of the laser marking in accordance with the present invention is able to counteract at least to some degree the inconsistencies resulting from the use of such a highly reactive laser additive.
In summary, therefore, the present invention in this embodiment provides for a laser mark which is most suitable for enhancing by heat treatment, this by the raising of the laser mark indicia above and preferably below the tag surface prior to its heat treatment and providing at least one gap in the raised mark.
Where in the foregoing description, reference has been made to specific components or integers of the invention having known equivalents then such equivalents are herein incorporated as if individually set forth.
Although this invention has been described by way of example and with reference to possible embodiments thereof, it is to be understood that modifications or improvements may be made thereto without departing from the scope of the invention as defined in the appended claims.
Claims (23)
1 . A tag incorporating indicia which has been provided on a surface of the tag by a laser in which the contrast between the indicia and the tag material has been improved by heating the tag surface to a temperature sufficient to melt the surface and the laser indicia.
2. The tag as claimed in claim 1 in which the indicia has one or more portions thereof raised above the surface of the tag and with at least one gap provided in or between the or each raised portion.
3. A tag as claimed in claim 1 or claim 2 in which the tag is of polyurethane and the temperature is between approximately 50°C and 500°C.
4. A tag as claimed in claim 3 wherein temperature is between approximately 1 75 °C and 250 °C.
5. A tag as claimed in any one of claims 1 to 4 wherein the heating of the tag surface is by the application under pressure of at least one hot plate to the tag surface.
6. A tag as claimed in claim 5 in which the or a said hot plate is applied first to the tag surface provided with the indicia and subsequently to an opposite surface of the tag without the indicia.
7. A tag as claimed in claim 6 in which the hot plate is applied to the surface with the indicia for a period of at least 10ms.
8. A tag as claimed in claim 2 or any one of claims 3 to 7 when dependent on claim 2 in which the one or more raised portions of the indicia are approximately
0.1 mm above the surface on which the indicia is provided.
9. A tag as claimed in claim 8 in which the material of the tag forming the indicia penetrates to a depth of approximately 0.1 mm below said surface.
10. A tag as claimed in either of claims 8 or 9 in which a plurality of said raised portions are provided spaced apart in forming the indicia.
1 1 . A tag as claimed in claim 10 in which the raised portions are spaced apart from each other approximately 0.3mm.
1 2. A claim as claimed in claim 1 1 in which the raised portions are provided as a plurality of peaks with intermediate gaps or troughs.
13. A tag substantially as herein described with reference to Figure 1 or Figures 2 to 4 of the accompanying drawings.
14. A method of laser marking a tag (as herein defined) including:
(I) applying the required indicia by a laser to mark a tag surface;
(ii) heating the surface to a temperature sufficient to melt the surface and the indicia to blend the material together to improve the contrast of the indicia and the. material.
1 5. A method of laser marking a tag as claimed in claim 14 including providing the indicia raised above a surrounding surface and the indicia includes at least one gap therein.
1 6. A method as claimed in claim 14 or claim 1 5 in which the heating of the surface is by the application under pressure of at least one hot plate.
1 7. A method as claimed in any one of claims 14 to 1 6 in which the heating is first of the said surface featuring the indicia and subsequently to an opposite surface not featuring the indicia.
18. A method as claimed in any one of claims 14 to 17 in which said temperature is between approximately 50°C to 500°C.
19. A method as claimed in claim 18 in which the temperature is between 175°C and 250 °C.
20. A method as claimed in any of claims 14 to 19 in which the tag following its heating is quenched between a pair of relatively cold plates.
21 . A method as claimed in any one of claims 14 to 20, including providing a monitoring means to monitor the heating times, pressures and/or temperatures and to prevent the tag surface from burning or over-melting.
22. A method as claimed in claim 14 or claim 1 5 in which the heating is by means of a hot fluid applied to the tag surface.
23. A method of laser marking a tag substantially as herein described with reference to Figure 1 or Figures 2 to 4 of the accompanying drawings.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ508331 | 2000-11-21 | ||
NZ50833100 | 2000-11-21 | ||
NZ508861 | 2000-12-13 | ||
NZ50886100 | 2000-12-13 | ||
PCT/NZ2001/000261 WO2002043034A1 (en) | 2000-11-21 | 2001-11-21 | Tag marking |
Publications (1)
Publication Number | Publication Date |
---|---|
AU2002224245A1 true AU2002224245A1 (en) | 2002-06-03 |
Family
ID=26652231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2002224245A Abandoned AU2002224245A1 (en) | 2000-11-21 | 2001-11-21 | Tag marking |
Country Status (7)
Country | Link |
---|---|
US (1) | US20040021313A1 (en) |
EP (1) | EP1344205A4 (en) |
JP (1) | JP2004514923A (en) |
AR (1) | AR038766A1 (en) |
AU (1) | AU2002224245A1 (en) |
BR (1) | BR0115469A (en) |
WO (1) | WO2002043034A1 (en) |
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FR2762425B1 (en) * | 1997-04-18 | 1999-06-04 | Chevillot Sa | INFALSIFIABLE, INDELEBILE AND CONTRAST MARKING OF OBJECTS AND PARTICULARLY LABELS |
WO1999025562A1 (en) * | 1997-11-14 | 1999-05-27 | Cerdec Corporation | Laser marking method and material |
US6497062B1 (en) * | 2000-09-22 | 2002-12-24 | Gene T. Koopman | Identification tag |
US6571494B1 (en) * | 2001-05-03 | 2003-06-03 | G. Alan Halderman | Animal identification tag |
-
2001
- 2001-11-21 US US10/432,304 patent/US20040021313A1/en not_active Abandoned
- 2001-11-21 AU AU2002224245A patent/AU2002224245A1/en not_active Abandoned
- 2001-11-21 JP JP2002544697A patent/JP2004514923A/en not_active Withdrawn
- 2001-11-21 AR ARP010105433A patent/AR038766A1/en unknown
- 2001-11-21 WO PCT/NZ2001/000261 patent/WO2002043034A1/en active IP Right Grant
- 2001-11-21 BR BR0115469-9A patent/BR0115469A/en not_active Application Discontinuation
- 2001-11-21 EP EP01997795A patent/EP1344205A4/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
BR0115469A (en) | 2003-08-19 |
WO2002043034A1 (en) | 2002-05-30 |
EP1344205A1 (en) | 2003-09-17 |
AR038766A1 (en) | 2005-01-26 |
US20040021313A1 (en) | 2004-02-05 |
EP1344205A4 (en) | 2004-05-19 |
JP2004514923A (en) | 2004-05-20 |
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