CA2111162A1 - Colored marking of plastic surfaces by means of laser radiation - Google Patents
Colored marking of plastic surfaces by means of laser radiationInfo
- Publication number
- CA2111162A1 CA2111162A1 CA 2111162 CA2111162A CA2111162A1 CA 2111162 A1 CA2111162 A1 CA 2111162A1 CA 2111162 CA2111162 CA 2111162 CA 2111162 A CA2111162 A CA 2111162A CA 2111162 A1 CA2111162 A1 CA 2111162A1
- Authority
- CA
- Canada
- Prior art keywords
- plastic
- colored
- marked
- carrier material
- laser
- 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
- 239000004033 plastic Substances 0.000 title claims abstract description 30
- 229920003023 plastic Polymers 0.000 title claims abstract description 30
- 230000005855 radiation Effects 0.000 title abstract description 10
- 239000012876 carrier material Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 9
- -1 polypropylene Polymers 0.000 claims description 16
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 229920000728 polyester Polymers 0.000 claims description 2
- 239000012744 reinforcing agent Substances 0.000 claims description 2
- 239000012763 reinforcing filler Substances 0.000 claims description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 claims description 2
- 229930182556 Polyacetal Natural products 0.000 claims 1
- 239000004734 Polyphenylene sulfide Substances 0.000 claims 1
- 229920006324 polyoxymethylene Polymers 0.000 claims 1
- 239000000758 substrate Substances 0.000 claims 1
- 238000005299 abrasion Methods 0.000 abstract 1
- 239000000975 dye Substances 0.000 description 19
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 229930040373 Paraformaldehyde Natural products 0.000 description 4
- 230000009102 absorption Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- MHXFWEJMQVIWDH-UHFFFAOYSA-N 1-amino-4-hydroxy-2-phenoxyanthracene-9,10-dione Chemical compound C1=C(O)C=2C(=O)C3=CC=CC=C3C(=O)C=2C(N)=C1OC1=CC=CC=C1 MHXFWEJMQVIWDH-UHFFFAOYSA-N 0.000 description 2
- 241000517645 Abra Species 0.000 description 2
- 101100536354 Drosophila melanogaster tant gene Proteins 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000001044 red dye Substances 0.000 description 2
- 238000000859 sublimation Methods 0.000 description 2
- 230000008022 sublimation Effects 0.000 description 2
- 101001015038 Albizia kalkora Kunitz-type trypsin inhibitor alpha chain Proteins 0.000 description 1
- 241000905957 Channa melasoma Species 0.000 description 1
- CHBRHODLKOZEPZ-UHFFFAOYSA-N Clotiazepam Chemical compound S1C(CC)=CC2=C1N(C)C(=O)CN=C2C1=CC=CC=C1Cl CHBRHODLKOZEPZ-UHFFFAOYSA-N 0.000 description 1
- 229920000265 Polyparaphenylene Polymers 0.000 description 1
- 241001208007 Procas Species 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 150000005673 monoalkenes Chemical class 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000412 polyarylene Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000010023 transfer printing Methods 0.000 description 1
Classifications
-
- 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
- B41M5/382—Contact thermal transfer or sublimation processes
- B41M5/38207—Contact thermal transfer or sublimation processes characterised by aspects not provided for in groups B41M5/385 - B41M5/395
-
- 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
- B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
- B41M5/035—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic
- B41M5/0358—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic characterised by the mechanisms or artifacts to obtain the transfer, e.g. the heating means, the pressure means or the transport means
-
- 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
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Abstract of the disclosure Colored marking of plastic surfaces by means of Laser radiation A process for marking plastics, in which a carrier material which is provided with a sublimable dye is pressed against the plastic to be marked which comprises providing the plastic surface with colored symbols by means of a laser which emits in the visible wavelength range (wavelength 532 nm), giving abrasion-resistant colored symbols of high resolution.
Description
-- 2 ~
HOECHST AKTI~N~ESELLSC~AFT HOE 92/F 403 Dr.~/PP
Description Colored m~rkLng . of plastic ~urfacel3 by m~ of Laser radiation The in~ention relatee to a proa~e for the production of plastic ~urface~ which have been printed in ~olor by applyi~g a dye to the plastic eurface by meane o~ laeer radiation.
It is known that plastic ~urfaces can b~ ~arl~e~ by means of laser radiation, preferably using an Nd:YAG
laeer (wavelength 1064 nm) or a ~reguenoy-doubl~d Nd:YAG
la~er (wavelength 532 nm). In thie method, a color change which can be adjusted aB d~eired cannot be a¢hieved flexibly: ~n general, only pale markings on a dark background or dark markings on a pale background are poseible. In addition, the color change ie af~ected greatly by the plastic to be marked.
:, ,.:
Alao known are proceeses for providi~g pla~tic parte ~ith colored 8y~bol8, for examplQ by hot ska~pin~ multi-color iniection molding, thermofixing pr~nti~g or transfer printing, or sublimatio~ printing. Di~ad~antagea of these proceReee are, in particular, poor ~lexibility and hence exceesive coste for emall runs. In addition, computer-integrat~d manu~acturi~g, a3 is increasingly ueed today in the ~l~ctrical/electronic~ and automotive industries, is only po~sible to a limitad extent, or not at all. Further dieadvantagee of thQee proceeee~ are the use of dy~ so}vent~ in aome cae~s, whi~h i8 aesociated with diepo~al probleme, and poor reproducibility during dye incorporation.
Likewi~e k~ow~ ie a procee~ for the color~d ~ark.ing of plaetics by diffu ing dyee into th~ point-h~ated ~urface of the plastic by mean~ of laeer radiation (~P-A-O 201 627). In thie proce8e, an Nd:YAG la er having 2 1 ~
a wavelength of 1064 nm i~ employed. Since the absorption of dye~ at wavelength~ in the near infra-red is ge~erally not very yreat, thi~ proca~e cannot be used to apply any desired colGr to the plaatic ~urface. In addition, point heating of the pla~tic surface i~ necel3aary in order to achieve adherent markings This l:ikewise restrict~
the choice of ~ubstrate, since materials which absorb in th~ near infra-red are necessary. If the sub~trate materials tend to carboniz0 or ~corch a~ the wavele~gth of the YAG laser, for exampla polymer~ carrying aromatic structural units, good color coverage i~ not enaursd either.
The object of the pre~ent invention i8 to find a proce~s which avoid6 ~aid diaadvantage~ and by mean~ of which colored ~ymbola can be applied f lexibly and at low ~oat to a pla~tic surface with con~tant quality. The cholce of dyes to be transferred and the choice o~ plastics to be marKed should be as broad as po~sible. In addition, the effects of carbonization and ~corching of the ~ub~trate pla3tic should ba minimized.
The invention ~hus relates to a proceaa ~or marking plastics, in which a carrier material which i8 provided with a sublimable dye i~ pres~ed agai~sk the plastic to be marked where the plastic sur~ace i8 provided with colored symbol~ by me~ns of a laser which amît~ in the viaible wavelength range, preferably a frequency-doubl~d Nd:YAG laser (wa~elength 532 nm).
In this proce~s, the laser beam causes tha dye to be transferred from a carrier material (transparent at the la~er wavelength) onto the pla~tic ~urfaca. At ~he ~ame time, ~om~ of the la~er en~rgy is ab~orbed in the 8ub-strate materi~l, fixing the dye on the plaatic aurface.
According to the invention, a fregusncy-do~bled Nd:~AG
laaar having a wavelength o~ 532 nm i8 employed. This can be moved over the carrier material in such a way tha~ th~
plastic surace can be provided with the desired a~ol~.
-` 2111~ ~
HOECHST AKTI~N~ESELLSC~AFT HOE 92/F 403 Dr.~/PP
Description Colored m~rkLng . of plastic ~urfacel3 by m~ of Laser radiation The in~ention relatee to a proa~e for the production of plastic ~urface~ which have been printed in ~olor by applyi~g a dye to the plastic eurface by meane o~ laeer radiation.
It is known that plastic ~urfaces can b~ ~arl~e~ by means of laser radiation, preferably using an Nd:YAG
laeer (wavelength 1064 nm) or a ~reguenoy-doubl~d Nd:YAG
la~er (wavelength 532 nm). In thie method, a color change which can be adjusted aB d~eired cannot be a¢hieved flexibly: ~n general, only pale markings on a dark background or dark markings on a pale background are poseible. In addition, the color change ie af~ected greatly by the plastic to be marked.
:, ,.:
Alao known are proceeses for providi~g pla~tic parte ~ith colored 8y~bol8, for examplQ by hot ska~pin~ multi-color iniection molding, thermofixing pr~nti~g or transfer printing, or sublimatio~ printing. Di~ad~antagea of these proceReee are, in particular, poor ~lexibility and hence exceesive coste for emall runs. In addition, computer-integrat~d manu~acturi~g, a3 is increasingly ueed today in the ~l~ctrical/electronic~ and automotive industries, is only po~sible to a limitad extent, or not at all. Further dieadvantagee of thQee proceeee~ are the use of dy~ so}vent~ in aome cae~s, whi~h i8 aesociated with diepo~al probleme, and poor reproducibility during dye incorporation.
Likewi~e k~ow~ ie a procee~ for the color~d ~ark.ing of plaetics by diffu ing dyee into th~ point-h~ated ~urface of the plastic by mean~ of laeer radiation (~P-A-O 201 627). In thie proce8e, an Nd:YAG la er having 2 1 ~
a wavelength of 1064 nm i~ employed. Since the absorption of dye~ at wavelength~ in the near infra-red is ge~erally not very yreat, thi~ proca~e cannot be used to apply any desired colGr to the plaatic ~urface. In addition, point heating of the pla~tic surface i~ necel3aary in order to achieve adherent markings This l:ikewise restrict~
the choice of ~ubstrate, since materials which absorb in th~ near infra-red are necessary. If the sub~trate materials tend to carboniz0 or ~corch a~ the wavele~gth of the YAG laser, for exampla polymer~ carrying aromatic structural units, good color coverage i~ not enaursd either.
The object of the pre~ent invention i8 to find a proce~s which avoid6 ~aid diaadvantage~ and by mean~ of which colored ~ymbola can be applied f lexibly and at low ~oat to a pla~tic surface with con~tant quality. The cholce of dyes to be transferred and the choice o~ plastics to be marKed should be as broad as po~sible. In addition, the effects of carbonization and ~corching of the ~ub~trate pla3tic should ba minimized.
The invention ~hus relates to a proceaa ~or marking plastics, in which a carrier material which i8 provided with a sublimable dye i~ pres~ed agai~sk the plastic to be marked where the plastic sur~ace i8 provided with colored symbol~ by me~ns of a laser which amît~ in the viaible wavelength range, preferably a frequency-doubl~d Nd:YAG laser (wa~elength 532 nm).
In this proce~s, the laser beam causes tha dye to be transferred from a carrier material (transparent at the la~er wavelength) onto the pla~tic ~urfaca. At ~he ~ame time, ~om~ of the la~er en~rgy is ab~orbed in the 8ub-strate materi~l, fixing the dye on the plaatic aurface.
According to the invention, a fregusncy-do~bled Nd:~AG
laaar having a wavelength o~ 532 nm i8 employed. This can be moved over the carrier material in such a way tha~ th~
plastic surace can be provided with the desired a~ol~.
-` 2111~ ~
Since dyes usually absorb - at lea~t partially - in the vi~ible region o the wavelength ~pectrum, ab~orption of the radiation energy in the dyes takes place at 532 nm.
These dye~ thus di~fuse out of the carrier material onto the plastic 3urface. The carrier material should gener-ally not absorb in the proces~ at the wavelength of 532 nm, while the pla~tic aurface to be printed ~upports, by energy absorption, fixing of the diffu~ing dye. In addition, subseguent fixing iB al80 posl3ible. Thi~ can be achieved either by con~entional heat ~ources or laser radiation in a ~econd irradiation step or by in~ra-red irradiation. It is al~o possible for the sub3trate fir~t to be pre-marked without a carrier material~ and for colored marking then to be carried out in a ~econd step using a carrier film. Under certain circum~tances, this can increase the adhesive strength of the markings.
' : : ' It i~ expedient to press the dye-containing carrier material firmly onto the material to be marked ~i~ce this aharply bundles the energy tran~fer onto the surfacs to be mar~:ed and extremely aharp contour~ fon~. It i~
alao possible to employ furth~r aids which support the pressing.
~ ~ .
The proce~s according to the invention allow~ colored symbols to be applied to a plastic aurface in a~
abra~ion-resistant manner and in high resolution. Suit-able parameter~ of the laser employ~d are: the repetition frequency i~ in the range from 1 to 20 kHz, preferably from 4 to 6 kHz, the lamp current is in the range from 15 to 25 A, preferably 20 A, and the sp~ed is i~ the range from 5 to 50 mm/~ec, preferably from 20 to 30 mm/sec.
Suitable dyea or mixtures o dyes have proven to be thoae which are applied to a carrier material in the form of a film or coating a~d which sublime when a small amount of energy is Rupplied. These are known and ar~ described, ~or example, in the Colour Index. The e al~o include , . . . ~ ~ ~ . , ;
211~1g ~
products on the market und~r the name~ ~Lurafix (manu-facturer BASF AG, Ludwigshafen, Germany) or ~Resir~n ~manufacturer Bayer AG, Leverku~en, Germany).
Ex2mples of suitable c~rrier materialEI which generally only abborb energy to a ~mall extent, or not at all, at the wavelength of the fre~uency-doubl~sd ~AG l~er are polyethylene, polypropylene or polyester film~, pre$er-ably polypropylen~ film~.
Suitable pla~tic material~ are tho~e which abaorb, at least partially, the incident energy o~ the wavel0ngth of the frequency-doubled YAG la~er. In general, suitable fillerR, dyes and/or pigments which enable such absorp-tion are added to the plastic materials. Examples of preferred plastic~ are polyacetala, ~uch as polyoxy-methylene homopolymers and copolymer~, polye~ter~, ~uchas polyethylene terephthalate and polybutylene t~re-phthalate, liguid-crystalline polyester~, polyarylene ~ulfide~, and polypropylene which has been provided with reinforcing materials and/or fillers, copolymer~ thereof 2Q with other monoolefin~ and blend~ thereof with impact modifiera. It is al~o possibl2 to u~e mixture~ of variou~
polymers.
Depending on the application, ~urther substances can be added to the molding compo~ition, for example fill~ra, such a~ chalk, mica, talc, feldspar, wollastoni~e a~d aluminum Rilicate, furthermore antioxidant~ ht stabilizers, flameproofing agent~, heat stabilizeru, reinforcing agent~, such a~ ~la~s fiber~, or proceasing a~xiliarie_ which are customary in the proce~ing of pla~tic~.
The molding~ produced from th~ plastic mold~ng com-position~ by conventional processe~ can be of any d~sired type and Rize and are then ~ ed with the aid o$ the proces~ o~ the i~vention.
-: ' '' ' ~ ' ' '', ' . '' ': , .' '' . "' ' ', ., .' ~ ' ': ' . ', , :' ~ ` 21111~;~
The marked moldings can be u~ed in all area~ o~
technology, for example in the m~rking of container~
~cans and film~), in the electronic~, motor vehicle and aero~pace industries, in equipment manufacture, in installation engineering and in other areas known to a person ~killed in the art.
Example~
1) A polypropylene film printed over 1:he entire surfacQ
with the dye (C.I. Disper~3 Red 60, C~Io 60756) l~ laid on a Rheet-like plastic te~t specimen ~ade from polyoxy-methylene (POM) having an MFI (2.16 kg, 190C) o~
9 g/10 min and expo~ed to the radiation of a freguency-doubled Nd:YAG la~er (wavelength 532 nm). The repe~ition frequency wa~ 5 kHz, the lamp ~urrent was 20 A and the ~peed was 25 mm/eec. During the radiation period, the la~er beam waa moved in ~uch a way that ~ymbol~ were formed on the test spe~imen. After removal of the film, the dye has penetrated into the pla~tic in the irradiated zona and gave a perfe~t print image.
2 to 4) Example l was repeated, but the red dye was replaced by ~ublimation dye~ of di~er0nt colora, which likewi~e gave uniform regult~.
_ .
Example Sublimation ~ye I _ 2 C.I. D~per~e Orange 25 I _ 3 C.I. Disper~e Blu~ l4 _ . 4 D.I. Di~per~e Yellow 54 5) Example 1 was repeated, but the polypropylene ~ilm printed over th~ entire Rurface with C.I. Disper~e Red 60 was replaced by a polyethylene film printed over the entire ~ur~ace. The re~ult wa~ the ~ame aB in Example l.
6 to 9) Example 1 wa~ repeated, but the POM wa~
--" 211116~
replaced by Rheet-like te~t ~pecimen~ made from other plastic molding composition~.
¦ Example Sublimation dye Plastic ¦ 6 C.I. Disperse Red 60 polybutylsne _ _ terephthalate 7 C.I. Disper~e Red 60 reinforcQd polypropylene C.I. Disperse Red 60 polyphenylene ~ulfide ~:
9 C.I. Disper~e Red 60 liquid-cry~talline . polye~ter Here too, the qame reault~ a~ in Example 1 were achieved.
10 to 21) Example~ 6 to 9 were repeated, but the red dye waR replaced by the dyes mentioned in Example~ 2 to 4 for the plastic~. ~ere too, perfect reRultR were achisved.
22) Example 1 waR repeated, but a ~hee~-like pla~tic ~
molding made from polybutylene terephthalate is first ~ :
marked by the action of the laser beam alo~e without :~
a colored film. A polypropylene film printed over the entire surface with C.I. Di~per~e Red 60 wa~ the~ laid on the te3t ~pecimen, which wa~ m~rked as in E~a~ple 1, this time in color. ~n abra~ion-re~i~tant marking wa~
obtained.
. ~
These dye~ thus di~fuse out of the carrier material onto the plastic 3urface. The carrier material should gener-ally not absorb in the proces~ at the wavelength of 532 nm, while the pla~tic aurface to be printed ~upports, by energy absorption, fixing of the diffu~ing dye. In addition, subseguent fixing iB al80 posl3ible. Thi~ can be achieved either by con~entional heat ~ources or laser radiation in a ~econd irradiation step or by in~ra-red irradiation. It is al~o possible for the sub3trate fir~t to be pre-marked without a carrier material~ and for colored marking then to be carried out in a ~econd step using a carrier film. Under certain circum~tances, this can increase the adhesive strength of the markings.
' : : ' It i~ expedient to press the dye-containing carrier material firmly onto the material to be marked ~i~ce this aharply bundles the energy tran~fer onto the surfacs to be mar~:ed and extremely aharp contour~ fon~. It i~
alao possible to employ furth~r aids which support the pressing.
~ ~ .
The proce~s according to the invention allow~ colored symbols to be applied to a plastic aurface in a~
abra~ion-resistant manner and in high resolution. Suit-able parameter~ of the laser employ~d are: the repetition frequency i~ in the range from 1 to 20 kHz, preferably from 4 to 6 kHz, the lamp current is in the range from 15 to 25 A, preferably 20 A, and the sp~ed is i~ the range from 5 to 50 mm/~ec, preferably from 20 to 30 mm/sec.
Suitable dyea or mixtures o dyes have proven to be thoae which are applied to a carrier material in the form of a film or coating a~d which sublime when a small amount of energy is Rupplied. These are known and ar~ described, ~or example, in the Colour Index. The e al~o include , . . . ~ ~ ~ . , ;
211~1g ~
products on the market und~r the name~ ~Lurafix (manu-facturer BASF AG, Ludwigshafen, Germany) or ~Resir~n ~manufacturer Bayer AG, Leverku~en, Germany).
Ex2mples of suitable c~rrier materialEI which generally only abborb energy to a ~mall extent, or not at all, at the wavelength of the fre~uency-doubl~sd ~AG l~er are polyethylene, polypropylene or polyester film~, pre$er-ably polypropylen~ film~.
Suitable pla~tic material~ are tho~e which abaorb, at least partially, the incident energy o~ the wavel0ngth of the frequency-doubled YAG la~er. In general, suitable fillerR, dyes and/or pigments which enable such absorp-tion are added to the plastic materials. Examples of preferred plastic~ are polyacetala, ~uch as polyoxy-methylene homopolymers and copolymer~, polye~ter~, ~uchas polyethylene terephthalate and polybutylene t~re-phthalate, liguid-crystalline polyester~, polyarylene ~ulfide~, and polypropylene which has been provided with reinforcing materials and/or fillers, copolymer~ thereof 2Q with other monoolefin~ and blend~ thereof with impact modifiera. It is al~o possibl2 to u~e mixture~ of variou~
polymers.
Depending on the application, ~urther substances can be added to the molding compo~ition, for example fill~ra, such a~ chalk, mica, talc, feldspar, wollastoni~e a~d aluminum Rilicate, furthermore antioxidant~ ht stabilizers, flameproofing agent~, heat stabilizeru, reinforcing agent~, such a~ ~la~s fiber~, or proceasing a~xiliarie_ which are customary in the proce~ing of pla~tic~.
The molding~ produced from th~ plastic mold~ng com-position~ by conventional processe~ can be of any d~sired type and Rize and are then ~ ed with the aid o$ the proces~ o~ the i~vention.
-: ' '' ' ~ ' ' '', ' . '' ': , .' '' . "' ' ', ., .' ~ ' ': ' . ', , :' ~ ` 21111~;~
The marked moldings can be u~ed in all area~ o~
technology, for example in the m~rking of container~
~cans and film~), in the electronic~, motor vehicle and aero~pace industries, in equipment manufacture, in installation engineering and in other areas known to a person ~killed in the art.
Example~
1) A polypropylene film printed over 1:he entire surfacQ
with the dye (C.I. Disper~3 Red 60, C~Io 60756) l~ laid on a Rheet-like plastic te~t specimen ~ade from polyoxy-methylene (POM) having an MFI (2.16 kg, 190C) o~
9 g/10 min and expo~ed to the radiation of a freguency-doubled Nd:YAG la~er (wavelength 532 nm). The repe~ition frequency wa~ 5 kHz, the lamp ~urrent was 20 A and the ~peed was 25 mm/eec. During the radiation period, the la~er beam waa moved in ~uch a way that ~ymbol~ were formed on the test spe~imen. After removal of the film, the dye has penetrated into the pla~tic in the irradiated zona and gave a perfe~t print image.
2 to 4) Example l was repeated, but the red dye was replaced by ~ublimation dye~ of di~er0nt colora, which likewi~e gave uniform regult~.
_ .
Example Sublimation ~ye I _ 2 C.I. D~per~e Orange 25 I _ 3 C.I. Disper~e Blu~ l4 _ . 4 D.I. Di~per~e Yellow 54 5) Example 1 was repeated, but the polypropylene ~ilm printed over th~ entire Rurface with C.I. Disper~e Red 60 was replaced by a polyethylene film printed over the entire ~ur~ace. The re~ult wa~ the ~ame aB in Example l.
6 to 9) Example 1 wa~ repeated, but the POM wa~
--" 211116~
replaced by Rheet-like te~t ~pecimen~ made from other plastic molding composition~.
¦ Example Sublimation dye Plastic ¦ 6 C.I. Disperse Red 60 polybutylsne _ _ terephthalate 7 C.I. Disper~e Red 60 reinforcQd polypropylene C.I. Disperse Red 60 polyphenylene ~ulfide ~:
9 C.I. Disper~e Red 60 liquid-cry~talline . polye~ter Here too, the qame reault~ a~ in Example 1 were achieved.
10 to 21) Example~ 6 to 9 were repeated, but the red dye waR replaced by the dyes mentioned in Example~ 2 to 4 for the plastic~. ~ere too, perfect reRultR were achisved.
22) Example 1 waR repeated, but a ~hee~-like pla~tic ~
molding made from polybutylene terephthalate is first ~ :
marked by the action of the laser beam alo~e without :~
a colored film. A polypropylene film printed over the entire surface with C.I. Di~per~e Red 60 wa~ the~ laid on the te3t ~pecimen, which wa~ m~rked as in E~a~ple 1, this time in color. ~n abra~ion-re~i~tant marking wa~
obtained.
. ~
Claims (7)
1. A process for marking plastics, in which a carrier material which is provided with a sublimable dye is pressed against the plastic to be marked which comprises providing the plastic surface with colored symbols by means of a laser which emits in the visible wavelength range.
2. The process as claimed in claim 1, wherein a frequency-doubled Nd:YAG laser (wavelength 532 nm) is used.
3. The process as claimed in claim 1 or 2, wherein the plastic used is a material which absorbs in the visible wavelength range.
4. The process as claimed in one or more of claims 1 to 3, wherein the plastic used is polyacetal, polybuty-lene terephthalate, reinforced polypropylene, poly-phenylene sulfide or a liquid-crystalline polyester.
5. The process as claimed in one or more of claims 1 to 4, wherein reinforcing agents and/or fillers are added to the plastic.
6. The process as claimed in one or more of claims 1 to 5, wherein the substrate is first pre-marked without a carrier material, and colored marking is then carried out in a second step.
7. A shaped article which is provided with symbols with the aid of the process as claimed in one or more of claims 1 to 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4242006 | 1992-12-12 | ||
| DEP4242006.7 | 1992-12-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2111162A1 true CA2111162A1 (en) | 1994-06-13 |
Family
ID=6475132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2111162 Abandoned CA2111162A1 (en) | 1992-12-12 | 1993-12-10 | Colored marking of plastic surfaces by means of laser radiation |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0605803A1 (en) |
| CA (1) | CA2111162A1 (en) |
| FI (1) | FI935528A (en) |
| MX (1) | MX9307866A (en) |
| NO (2) | NO934537D0 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11180099A (en) | 1997-12-18 | 1999-07-06 | Matsushita Electric Ind Co Ltd | Method for marking and resin molding with mark |
| DE102004016037A1 (en) * | 2004-03-30 | 2005-11-03 | Merck Patent Gmbh | Method for the permanent abrasion-resistant colored inscription and/or marking of plastics comprises preventing bleeding and/or blooming of the dye and/or absorber in the plastic during sealing of inscribed sites with a transparent polymer |
| JP5296374B2 (en) * | 2004-03-30 | 2013-09-25 | メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング | Sealing on plastic |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3517275A1 (en) * | 1985-05-14 | 1986-11-20 | Bayer Ag, 5090 Leverkusen | METHOD FOR LABELING PLASTICS |
| DE68928365T2 (en) * | 1988-11-18 | 1998-04-02 | De La Rue Co Plc | IMAGE PRODUCTION ON PLASTIC ITEMS |
| US5017547A (en) * | 1990-06-26 | 1991-05-21 | Eastman Kodak Company | Use of vacuum for improved density in laser-induced thermal dye transfer |
-
1993
- 1993-12-07 EP EP93119711A patent/EP0605803A1/en not_active Ceased
- 1993-12-09 FI FI935528A patent/FI935528A/en unknown
- 1993-12-10 NO NO934537D patent/NO934537D0/en unknown
- 1993-12-10 NO NO934537A patent/NO934537L/en unknown
- 1993-12-10 CA CA 2111162 patent/CA2111162A1/en not_active Abandoned
- 1993-12-10 MX MX9307866A patent/MX9307866A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FI935528A0 (en) | 1993-12-09 |
| EP0605803A1 (en) | 1994-07-13 |
| NO934537L (en) | 1994-06-13 |
| FI935528A (en) | 1994-06-13 |
| NO934537D0 (en) | 1993-12-10 |
| MX9307866A (en) | 1994-07-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1284125C (en) | Laser marking of pigmented high molecular weight polymer surfaces | |
| GB1596808A (en) | Decorated water-resistant rigid panels and their production | |
| US9916777B2 (en) | Label | |
| EP1560715B1 (en) | Laser marking process | |
| GB2227570A (en) | Producing coloured images in plastics materials | |
| US10125275B2 (en) | Film | |
| US20150293437A1 (en) | Laser markable film | |
| EP0924096B1 (en) | Marking method using energy rays and marked molding | |
| CA2111162A1 (en) | Colored marking of plastic surfaces by means of laser radiation | |
| EP0996549B1 (en) | Method and compositions for laser imprinting, and articles imprinted using such methods and compositions | |
| CA1200685A (en) | Curable temperature indicating composition | |
| WO1995024317A1 (en) | Object containing a burnt-in mark and process for manufacturing the object | |
| US20110318499A1 (en) | Laser fusible coating compositions used for laser making systems and methods | |
| KR19990044070A (en) | How to manufacture signs | |
| CZ295061B6 (en) | Use of a substrate with a paint primer layer for laser printing | |
| CN100500448C (en) | Color laser marking | |
| PT98567A (en) | METHOD FOR PREPARING A MULTICOLOR COATING CONSTITUTED BY A LIGAN AND AT LEAST ONE POLYMER CONTAINING HYDROXYL AND COMPOSITE MATERIALS USING THAT COAT | |
| US9427895B2 (en) | In-mold indicia marking of rotational molded products | |
| CA1116990A (en) | Manufacture of signs | |
| NZ529428A (en) | Graphics transfers for use in rotational molding | |
| JPH10278197A (en) | Decorative sheet and its manufacture | |
| JPH09118001A (en) | Decoration sheet and its manufacture | |
| JPH0416389A (en) | Multiple times printing thermal transfer sheet | |
| JPS6117275B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |