CA2185841A1 - Continuous flow ink jet-type general purpose surface coating applicator - Google Patents
Continuous flow ink jet-type general purpose surface coating applicatorInfo
- Publication number
- CA2185841A1 CA2185841A1 CA 2185841 CA2185841A CA2185841A1 CA 2185841 A1 CA2185841 A1 CA 2185841A1 CA 2185841 CA2185841 CA 2185841 CA 2185841 A CA2185841 A CA 2185841A CA 2185841 A1 CA2185841 A1 CA 2185841A1
- Authority
- CA
- Canada
- Prior art keywords
- coating
- applying
- surface coating
- substrate
- carrier fluid
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
Abstract
A coating applicator method is used to apply a coating substance to an ink jet printer substrate. The method comprises the steps of dissolving a coating substance in a carrier fluid to create a coating product. The coating product is applied as a controllable pattern of discrete droplets onto the substrate. This produces a uniform, controllable surface coating on the ink jet printer substrate. the surface coating typically being a liquid solution.
Description
I l~uuu~; FLvW INR J15T-TYrE G3~NER~
PURPOSE SURFACE C^ATI~G APPLIC~Tt)R
T-~hn~ el~
~he pre3ent invention relatel3 to nt-1n~7.,~ ink jet p~inter8 and, more pa~ticuli3rly, ~o a 8urace coating ~r~ tor for pri?ltins vlth suc~ p~in~ers pi-. L- -C -l Art In ~ t;n~ u ink j~l: printi~g, electrically ~ Au~-t~e ~ s ~rr] ~ under ~JL~_ ~U~: to a r-n;fnl~ region tha~ t~ -r--n the ink to a rl-l~ality of o~ifi--~, typically dLLe~ d 3n a linear array~s). Thc inL ai~;~L~ !~ ~ from the o~ifices in fi~ which brei~k into droplet ,-?tream~. Inai~ridual drc,plet 6treams ~ electively ~harged ~o 6~h~2r;~nti;~ ly two levels is~ the region of the brea~c of~ ~rc,m the fil. ~ and charged drop-i~r ~Afl-Act~Ald from th~ir normal rrajectories Either the ~fle-r~ drop8 or the llr~ fl~r~ drop9 a~c caught and recir~-ulatcd, and the o~her drops are allo~ed to proceed to a print medium~
In ~ome situatios~, it is ~ e to pro~idc a ~,,L,~ e with a ~ur~ace coating ha~ing a very unlo2~n surace dcn=ity This te~-hn;q~e can ~150 b~ ul3ed to make ;nt~nt;tn:~lly non-uniform aur~ace coatingE; or those vith int~i ~Rt~ de~igng The ~rior art ig rcplet~ h p~v~ ~cs ~or }Jro~ g s~face coatings. Ui~o? L~.ately, existins ~LV~ ULCli for producing surface ~ fin~5 invol~re a contact technique, wherein a fine povder or emul~:ion 18 3pread onto a surface, or a spraying ~ ~cc,~u~
~3ing droplecs i~ applicd having a ' t random di3tribution of volumes and i~pact ~rajectorles.
Contact s3ur~acc coa~ing p,~ c, are typically ~ 2 1 8584 1 sloY, _ t:J. with the speed of current in}c jet printing systems, and the ~spro.l.~ bility of soroe t-~rhniq~ ~ill depend on the distribution of parti~ls ~ es used. It i3 also di~icult to s diqtribute the particles ~enly ov~r broad ~u~ race~
~nd ov~r lo~g ~imes. Coatings with appreciablc det~il are dif:Eicult eo make or ~odify and involve using ~ 7ar~F, or some ot~er hardware control, which mUqt }~e changea ~hen a new pattern is to be p~vl~c~d, In an effor~ to overcome the problems A~ rii~ te~ w~th contact qur~ace coating 1~ v a~, ~on ~ L~,-vL ~ have ~een de~reloped - L~ tely, ~ILost non-con~act pLv~ 3~q involve Jo~e form or a spraying p~ ULe:, and only have li~ited conrrol oYer ~ irri~liry, Such ~vcerl~s all;o require i~ m~ , such as 8 ~ Ate, ~:o produce ~ ?ta;~ surface coAt;ns-~ A spraying t~rhni~e is algo A~f~c1~.lt to manage in ~it~ti~nq wher~ the dropl~Cs touch after being applied to the ~uL .L~c.te and r~ oqcF~ into larger dropg before drying.
It ig par~lr~ rl~ A~ ir~Ahle in the ph~ e-~tjc`~l industry to he able ~o provide a su~b~rate covering, such iP~i a - 'j r:lt~3 pad or biandage, where- th~ ~ ''r,p~nn il~ unifo~nly, controlli~bly applied to the skin surface.
It is Pesn thsn ehat ~here exi~it~ a need for an i ~ 3urface coatil~g arrl; rpi r~r proce~
which v _ ~~ the problems ~3o~ te~ with th~
3 o prior E~rt Summa n~ o~ the In~r~nt; rn ~hi~ need iq ~et by ti}~e ~r, n~; nlln~ Elow ink ~et general purpoSe ~urface coat~ng applica~or 3~ proce~s ~rcr~r~in~ ~o ~he pre~ent invention, wherein ~ 2~ 8584 1 a fast, non-contact coating method p~ovides quasi-imiform surface den6ity coa~ing ~rith excellenr i hi 1 7 ty .
I~ acc~,~ dl~ L with one aspect of the pres~nt inven~:ion, a method i9 urjad to apply a coating s~Z~st~tnce to an ink j~t printer substrate.
Th~3 method ~ c~c the step~ of dissolving the eoating ~ L~znce in a carrier f luid to create a co~ting product, and applying a ~nt~l l, hle pattern o~ di~crete droplets Or the coating product onto the ~ub:trate This ~, -,.luc~ a uni~orm, control~ble sur~ace coating on ~he ink jet printer substrate, The surface coating is tyE ically a liquid ~ol~
~e coating product is ~-~r~ by the ~ nk j et printer as uniform, co~trolla~le, discrete droplet~, onto the ~uL~ ~te, and the carrier ~luid i~i allow~d to ~:V~LCLt~:, leavlng the coating substance on the .uL3LL~te .
p^-~A~ir~7y, it i8 an object of the presen~: in~rention to pro~ide a ~uasi-uni~orr,7 surface de~sif:y coating over bro~d areas. It i~i a ~urther obj~ o~ t~c present invention to provide such a coat~ng having ~ nr ~ hil; ty over long period of t:i~e. It ls yet another object o~ the pre8ent invention to provide -r,r~ r pattern versatility, O~her objects and ad(J~t~- - o~ tbe inw~ntion vill be apparent from the ~ollo~ing de~cript ~ on, the ~ , ying drawings and the ~l'r~ claim~.
Brie~ D~8c~iption of thr~( DraWi ~g~
Fig. 1 is one; ~ r~ri-~n of a coating pattern ~ nqc~ in acl,~,L/l-r~.e with the presen~
invention; and 21 8584 t Fig. 2 is a flow chart diagram ~t;7i 1 ing the ~3teps for applyiAg the coating product, in ac~v, ~..e with the pre~ent invention Der~7i led De~cri~tio7t of the P~ _f~rr~d ~ ' '; -The co~ting method a~cording to the present invention i~ particularly for u6e on a ~7~i7~1~n~7 ir~c jet printi lg system o~ the tyF7e 7-.~herein droF7la:s of ~ nt7;771y i~7 nri~ s77 size ald v~7l7~nte are pL~J,I~ at high r~y~ A ar.td can ~7e individually s~ r~-d to ei7~her print on a substrate or ~e cc~ UL~d ar~td irr~rrolly recirculated.
I7~t ~ .e ~ th the prese7 tt ~r.tv~ntion, the gl~h~t;777~e ro ~e r7epn~it~r7 a5 a r7 coating if~ dis~olved in a ~nl77tior~ of ink, alconol, water, or any fluid tnat i3 . ,. ih~ with r7~e fluid sy~tem 7.7.7~tterials. For p~oper op~7ti~7n of the pr~t head, as i~ typical, the sti l:~t.jnn op~Pti point IttU3t ~e ~e t~hl i s:hr d fo~ this f luid and the ~e~istivity ~ tormi~ , If needed, the co7apo3ition o~ the fluid ~ty ~e changed to iLt~rease the r~nn~l7~`rivity in or~3er to provide fo~ 'deT''te drople~t char,g~ ng and ~o7~ 7~ ~l th~tl~h ~to 7~te~ 1-defined upE7er limit exists for the fluid resisti~ity, an a~ r~ed value is apprn~ri~ ly ~7oOo o~n-cm~
O~te coatiAg patterLt, i~lt7~'rat-~d in F$g 1, is ~7J~tain~ y s~nding the proper e~, -~ of print pul~eg r~o rrint~ 7. 10 aAd maviAg the ~u~3t~Stte 12 a~ ~ t~tlforr7 veloaity past the printhead, in ~he r7;r~crlr~n o arro~ 14. ~3 will 72e o~7vious to those Js,cilled in thc art, th~ proper print pul~es iB a f7~T.tction o~ *7u7~7stra~e speed, dro721et 3ize, a~td ~ rat j nn f ~ f cour~7e, rnn~f~ntrSt7-tnn of the sol7lt inn will al~o 2t8584t affect ~he ~ of prisl~ pulses r~ntinllin~ ith Fig 1, in ;7r~or~7An--e-h rhe present i~vention, the coating ~,ccd~ i9 to pu~ dis~reCe ~roplets o~ a coating product 16 onto the ~ub3trate 12. h. ~oaring sllb3tan~e, 37lch 2g a ~ '7 r~ t it~n to ~7e ahQr~r~r~ into the skin, i~3 diQslolved in a carrier iluid, ~uch as water or alcohol ~o cre~te the coating produc~ 16 A
controllable pattern of discrete ~7~oplet~ of the coating product 16 i9 eYr~ d onto th~ ~iu7c7strate 12 }~y the printhead lO. ~ h-t-At~ may ~7e ony ~-7;t lhle su~7strare~ ~uch as a bandage. The carrier d may the~ ~7e e~r7r~ts~1 o~ the ~u~strate, leaving only depo-~itc 18 Oc the coating g~ Anr e 15 ~S7~n~ bet~een l:h~ r are ~l~r.. bly la~g~
enough 7 o p~event droplet ~o 7le~~in~ beiore the coating aries~, ald~or the ~arrier fluid e~ 1/ Q.
i~e~rring nov to Pig_ 2, ;~ c~ntin-7i ~ith Pig. 1, droplet~ 16 are printed such that ono droplet does t contact any other droplet a~ter a~riving at the s7lbstrate 12 . i.L_~efo, ~, when the droplecs 16 dry, indi~idual ~ro~; t,q 18 of ral;idue r~s~ain On the sl~bstrate 12 7nif ;AI1Y~ then, a coating ~ QtS~n~e and a carrier ~3 uid are provided, a~ indi~ated by blocks 20 ar~ 22 o~ ~ig. 2. Thes coat~ng 5~lh-lrAn~ or example a sterold ~
1~ mixed as a true s~l"r;~ ~ wi~h a carri~r fluid, fo~ e~cample ~n a~cohol such a~i ~thanol, as indicated by block 24 The re~ultan~ coating produ~t i8 then printed on the ~ub8t~ate, a~ in~; At~ ~y block 26 When the alcohol evaporates ~rom ehe printed droplct, ~t block Z8, then th~ steroid re~Lins on ~he S~_L.c~.~e as individual dor~; tA of c~y8~allite8, aa in~rA~e~q a~ blo~k 30, to ~e ~5 ~ I .t ~ into the _kin ~hen the cubstrace is applied -6- 21~5847 ~o skin rt~nq~ nrly, aft~3r printing the dropletG 16 onto the substrate, the carrier fluid will evaporate, leaving be~ind deposits 18 of the S coating rn~ s will be obvicus to those skilled in the art, the rate o~ evaporation will depend on the carrier f luid used and the ambie~t and D~lLDLL~e corldi~ions. Also relevant, of course, is the degree to ~rhich the solution i~ Ahq~-h~-~i into the substrate If a highly ~ substrate material is cho~ien, then the proceYs of the presenC
i~vention may be u~eful ~s a v~ry controllable and er6J-tile surfa~e i, ~ to~. Conver ely, if the LD~La~e does not absorb the solution, then the ~Ddividual aro~let~ ~ill ~3vapor~te ~rirh ~ery similar drying times, leaYing behind small cryst ~11 i t~oq of the coating r~t~
Sin~e the droplets all have nearly ~ntir ~1 volume3 and the droplets on the ~.~L~LL Ite are not in contact with each other, ~hen using an illk jet printi~ Yyste~n of the type r-n~f~ct~--e~ by Sci~x Digital Printing, Inc, of ~ayton, Ohio, v~ry uniform cryYt:-l7;n~ growth can be r-inrAin~ f2-om droplet-to-droplet. In thiq way, powders o~ unifor~n ZS p~r~icle 5ize may be p--r~ 3 after removing the material from the su}~strate. After the individual droplets ~rrive at the ~lib~LLdtC and ~he carrier ~luid .~ L' tC13, the crystallites that are le~t }:~hind tend to ~e ~ery uniform in size Not only is the coating applied through a fast, non-contact proce~s, ~ut the actual crystallites o~ coating material ~at remain on the su~ rnt~ were ver~
uniform in ~i2e. In a.~ l4~ce ~ith the present inven~ion, therefore, a substance with a typically large variation in par~icle size can ~e created wi~h a very uniform pzrticle~ size The deposit8, or coating, tbe~, is ~laked off the cr~;~talli~es.
Therefore, the end product i8 not a coa~ing, but is a,~otber powder, vith Yery con~rolled and uniform par~i~le gi~e. If a single layer of the coa~ing ~ater~ al doe~ not provide the required aYerage ~;urfAce den3ity, anDther layer may be applied after the previous layer has dried i~ence, the coa~ing Icethod ~ccording to the presen~ invention can be u~;~d to apply thick, as well a~ thin, coatings~
In~llol rial APPlicability and ~r~y~r~t~ c The present invention is use~ul in the field of ink jet printing, and has the advantage of allow~ng i~or a quasi-uniform surface den~ity coating over broad are~as ~i~h F-Yr~ nt ~_~L~ . ihil i ty over lor~g time period6. The coating ~v-,c ~ of the pre:~ent invention is particularly ussful when applied to a priating system wherein d~oplot~ of eqF-nrially i~rt;~l si2e and Yolume are },~v-l~c~d a~ high f.Lc~ h.,ie~ and can be individually celected to ei~hor print on a substrate or be captures and i nt~ y recirculated, It is an sdvantage of the pr~sent lnYention tha~ atin5c~ can be produced at a th~yl~ , of up to 120 inches/~rond It i8 a ~urther adYantage oi~ tbe presen~ inven~ion that the ~ni ~rm; ~y Of the coating can be tnade very reproducibly and at virtually any value of Cur~ace density Finally, it i~ an advantage o~ the pre3ent inYention that the versatility o~ ~he sy~tem is ~uch ~hat a varie~y o~ coating pattern can be produced in any numbe~ or order of ~he desired pattern-~ving described the invention in de~a~ l and by re~erence ~o the preferred ~
. ~
ther~o~, ir ~rill be apparent that other ~odi~i~ations and varia~ions are possible without departing from ~he scope o~ the in~r~n~iOn de~ined in the ~ '3~ claim~.
PURPOSE SURFACE C^ATI~G APPLIC~Tt)R
T-~hn~ el~
~he pre3ent invention relatel3 to nt-1n~7.,~ ink jet p~inter8 and, more pa~ticuli3rly, ~o a 8urace coating ~r~ tor for pri?ltins vlth suc~ p~in~ers pi-. L- -C -l Art In ~ t;n~ u ink j~l: printi~g, electrically ~ Au~-t~e ~ s ~rr] ~ under ~JL~_ ~U~: to a r-n;fnl~ region tha~ t~ -r--n the ink to a rl-l~ality of o~ifi--~, typically dLLe~ d 3n a linear array~s). Thc inL ai~;~L~ !~ ~ from the o~ifices in fi~ which brei~k into droplet ,-?tream~. Inai~ridual drc,plet 6treams ~ electively ~harged ~o 6~h~2r;~nti;~ ly two levels is~ the region of the brea~c of~ ~rc,m the fil. ~ and charged drop-i~r ~Afl-Act~Ald from th~ir normal rrajectories Either the ~fle-r~ drop8 or the llr~ fl~r~ drop9 a~c caught and recir~-ulatcd, and the o~her drops are allo~ed to proceed to a print medium~
In ~ome situatios~, it is ~ e to pro~idc a ~,,L,~ e with a ~ur~ace coating ha~ing a very unlo2~n surace dcn=ity This te~-hn;q~e can ~150 b~ ul3ed to make ;nt~nt;tn:~lly non-uniform aur~ace coatingE; or those vith int~i ~Rt~ de~igng The ~rior art ig rcplet~ h p~v~ ~cs ~or }Jro~ g s~face coatings. Ui~o? L~.ately, existins ~LV~ ULCli for producing surface ~ fin~5 invol~re a contact technique, wherein a fine povder or emul~:ion 18 3pread onto a surface, or a spraying ~ ~cc,~u~
~3ing droplecs i~ applicd having a ' t random di3tribution of volumes and i~pact ~rajectorles.
Contact s3ur~acc coa~ing p,~ c, are typically ~ 2 1 8584 1 sloY, _ t:J. with the speed of current in}c jet printing systems, and the ~spro.l.~ bility of soroe t-~rhniq~ ~ill depend on the distribution of parti~ls ~ es used. It i3 also di~icult to s diqtribute the particles ~enly ov~r broad ~u~ race~
~nd ov~r lo~g ~imes. Coatings with appreciablc det~il are dif:Eicult eo make or ~odify and involve using ~ 7ar~F, or some ot~er hardware control, which mUqt }~e changea ~hen a new pattern is to be p~vl~c~d, In an effor~ to overcome the problems A~ rii~ te~ w~th contact qur~ace coating 1~ v a~, ~on ~ L~,-vL ~ have ~een de~reloped - L~ tely, ~ILost non-con~act pLv~ 3~q involve Jo~e form or a spraying p~ ULe:, and only have li~ited conrrol oYer ~ irri~liry, Such ~vcerl~s all;o require i~ m~ , such as 8 ~ Ate, ~:o produce ~ ?ta;~ surface coAt;ns-~ A spraying t~rhni~e is algo A~f~c1~.lt to manage in ~it~ti~nq wher~ the dropl~Cs touch after being applied to the ~uL .L~c.te and r~ oqcF~ into larger dropg before drying.
It ig par~lr~ rl~ A~ ir~Ahle in the ph~ e-~tjc`~l industry to he able ~o provide a su~b~rate covering, such iP~i a - 'j r:lt~3 pad or biandage, where- th~ ~ ''r,p~nn il~ unifo~nly, controlli~bly applied to the skin surface.
It is Pesn thsn ehat ~here exi~it~ a need for an i ~ 3urface coatil~g arrl; rpi r~r proce~
which v _ ~~ the problems ~3o~ te~ with th~
3 o prior E~rt Summa n~ o~ the In~r~nt; rn ~hi~ need iq ~et by ti}~e ~r, n~; nlln~ Elow ink ~et general purpoSe ~urface coat~ng applica~or 3~ proce~s ~rcr~r~in~ ~o ~he pre~ent invention, wherein ~ 2~ 8584 1 a fast, non-contact coating method p~ovides quasi-imiform surface den6ity coa~ing ~rith excellenr i hi 1 7 ty .
I~ acc~,~ dl~ L with one aspect of the pres~nt inven~:ion, a method i9 urjad to apply a coating s~Z~st~tnce to an ink j~t printer substrate.
Th~3 method ~ c~c the step~ of dissolving the eoating ~ L~znce in a carrier f luid to create a co~ting product, and applying a ~nt~l l, hle pattern o~ di~crete droplets Or the coating product onto the ~ub:trate This ~, -,.luc~ a uni~orm, control~ble sur~ace coating on ~he ink jet printer substrate, The surface coating is tyE ically a liquid ~ol~
~e coating product is ~-~r~ by the ~ nk j et printer as uniform, co~trolla~le, discrete droplet~, onto the ~uL~ ~te, and the carrier ~luid i~i allow~d to ~:V~LCLt~:, leavlng the coating substance on the .uL3LL~te .
p^-~A~ir~7y, it i8 an object of the presen~: in~rention to pro~ide a ~uasi-uni~orr,7 surface de~sif:y coating over bro~d areas. It i~i a ~urther obj~ o~ t~c present invention to provide such a coat~ng having ~ nr ~ hil; ty over long period of t:i~e. It ls yet another object o~ the pre8ent invention to provide -r,r~ r pattern versatility, O~her objects and ad(J~t~- - o~ tbe inw~ntion vill be apparent from the ~ollo~ing de~cript ~ on, the ~ , ying drawings and the ~l'r~ claim~.
Brie~ D~8c~iption of thr~( DraWi ~g~
Fig. 1 is one; ~ r~ri-~n of a coating pattern ~ nqc~ in acl,~,L/l-r~.e with the presen~
invention; and 21 8584 t Fig. 2 is a flow chart diagram ~t;7i 1 ing the ~3teps for applyiAg the coating product, in ac~v, ~..e with the pre~ent invention Der~7i led De~cri~tio7t of the P~ _f~rr~d ~ ' '; -The co~ting method a~cording to the present invention i~ particularly for u6e on a ~7~i7~1~n~7 ir~c jet printi lg system o~ the tyF7e 7-.~herein droF7la:s of ~ nt7;771y i~7 nri~ s77 size ald v~7l7~nte are pL~J,I~ at high r~y~ A ar.td can ~7e individually s~ r~-d to ei7~her print on a substrate or ~e cc~ UL~d ar~td irr~rrolly recirculated.
I7~t ~ .e ~ th the prese7 tt ~r.tv~ntion, the gl~h~t;777~e ro ~e r7epn~it~r7 a5 a r7 coating if~ dis~olved in a ~nl77tior~ of ink, alconol, water, or any fluid tnat i3 . ,. ih~ with r7~e fluid sy~tem 7.7.7~tterials. For p~oper op~7ti~7n of the pr~t head, as i~ typical, the sti l:~t.jnn op~Pti point IttU3t ~e ~e t~hl i s:hr d fo~ this f luid and the ~e~istivity ~ tormi~ , If needed, the co7apo3ition o~ the fluid ~ty ~e changed to iLt~rease the r~nn~l7~`rivity in or~3er to provide fo~ 'deT''te drople~t char,g~ ng and ~o7~ 7~ ~l th~tl~h ~to 7~te~ 1-defined upE7er limit exists for the fluid resisti~ity, an a~ r~ed value is apprn~ri~ ly ~7oOo o~n-cm~
O~te coatiAg patterLt, i~lt7~'rat-~d in F$g 1, is ~7J~tain~ y s~nding the proper e~, -~ of print pul~eg r~o rrint~ 7. 10 aAd maviAg the ~u~3t~Stte 12 a~ ~ t~tlforr7 veloaity past the printhead, in ~he r7;r~crlr~n o arro~ 14. ~3 will 72e o~7vious to those Js,cilled in thc art, th~ proper print pul~es iB a f7~T.tction o~ *7u7~7stra~e speed, dro721et 3ize, a~td ~ rat j nn f ~ f cour~7e, rnn~f~ntrSt7-tnn of the sol7lt inn will al~o 2t8584t affect ~he ~ of prisl~ pulses r~ntinllin~ ith Fig 1, in ;7r~or~7An--e-h rhe present i~vention, the coating ~,ccd~ i9 to pu~ dis~reCe ~roplets o~ a coating product 16 onto the ~ub3trate 12. h. ~oaring sllb3tan~e, 37lch 2g a ~ '7 r~ t it~n to ~7e ahQr~r~r~ into the skin, i~3 diQslolved in a carrier iluid, ~uch as water or alcohol ~o cre~te the coating produc~ 16 A
controllable pattern of discrete ~7~oplet~ of the coating product 16 i9 eYr~ d onto th~ ~iu7c7strate 12 }~y the printhead lO. ~ h-t-At~ may ~7e ony ~-7;t lhle su~7strare~ ~uch as a bandage. The carrier d may the~ ~7e e~r7r~ts~1 o~ the ~u~strate, leaving only depo-~itc 18 Oc the coating g~ Anr e 15 ~S7~n~ bet~een l:h~ r are ~l~r.. bly la~g~
enough 7 o p~event droplet ~o 7le~~in~ beiore the coating aries~, ald~or the ~arrier fluid e~ 1/ Q.
i~e~rring nov to Pig_ 2, ;~ c~ntin-7i ~ith Pig. 1, droplet~ 16 are printed such that ono droplet does t contact any other droplet a~ter a~riving at the s7lbstrate 12 . i.L_~efo, ~, when the droplecs 16 dry, indi~idual ~ro~; t,q 18 of ral;idue r~s~ain On the sl~bstrate 12 7nif ;AI1Y~ then, a coating ~ QtS~n~e and a carrier ~3 uid are provided, a~ indi~ated by blocks 20 ar~ 22 o~ ~ig. 2. Thes coat~ng 5~lh-lrAn~ or example a sterold ~
1~ mixed as a true s~l"r;~ ~ wi~h a carri~r fluid, fo~ e~cample ~n a~cohol such a~i ~thanol, as indicated by block 24 The re~ultan~ coating produ~t i8 then printed on the ~ub8t~ate, a~ in~; At~ ~y block 26 When the alcohol evaporates ~rom ehe printed droplct, ~t block Z8, then th~ steroid re~Lins on ~he S~_L.c~.~e as individual dor~; tA of c~y8~allite8, aa in~rA~e~q a~ blo~k 30, to ~e ~5 ~ I .t ~ into the _kin ~hen the cubstrace is applied -6- 21~5847 ~o skin rt~nq~ nrly, aft~3r printing the dropletG 16 onto the substrate, the carrier fluid will evaporate, leaving be~ind deposits 18 of the S coating rn~ s will be obvicus to those skilled in the art, the rate o~ evaporation will depend on the carrier f luid used and the ambie~t and D~lLDLL~e corldi~ions. Also relevant, of course, is the degree to ~rhich the solution i~ Ahq~-h~-~i into the substrate If a highly ~ substrate material is cho~ien, then the proceYs of the presenC
i~vention may be u~eful ~s a v~ry controllable and er6J-tile surfa~e i, ~ to~. Conver ely, if the LD~La~e does not absorb the solution, then the ~Ddividual aro~let~ ~ill ~3vapor~te ~rirh ~ery similar drying times, leaYing behind small cryst ~11 i t~oq of the coating r~t~
Sin~e the droplets all have nearly ~ntir ~1 volume3 and the droplets on the ~.~L~LL Ite are not in contact with each other, ~hen using an illk jet printi~ Yyste~n of the type r-n~f~ct~--e~ by Sci~x Digital Printing, Inc, of ~ayton, Ohio, v~ry uniform cryYt:-l7;n~ growth can be r-inrAin~ f2-om droplet-to-droplet. In thiq way, powders o~ unifor~n ZS p~r~icle 5ize may be p--r~ 3 after removing the material from the su}~strate. After the individual droplets ~rrive at the ~lib~LLdtC and ~he carrier ~luid .~ L' tC13, the crystallites that are le~t }:~hind tend to ~e ~ery uniform in size Not only is the coating applied through a fast, non-contact proce~s, ~ut the actual crystallites o~ coating material ~at remain on the su~ rnt~ were ver~
uniform in ~i2e. In a.~ l4~ce ~ith the present inven~ion, therefore, a substance with a typically large variation in par~icle size can ~e created wi~h a very uniform pzrticle~ size The deposit8, or coating, tbe~, is ~laked off the cr~;~talli~es.
Therefore, the end product i8 not a coa~ing, but is a,~otber powder, vith Yery con~rolled and uniform par~i~le gi~e. If a single layer of the coa~ing ~ater~ al doe~ not provide the required aYerage ~;urfAce den3ity, anDther layer may be applied after the previous layer has dried i~ence, the coa~ing Icethod ~ccording to the presen~ invention can be u~;~d to apply thick, as well a~ thin, coatings~
In~llol rial APPlicability and ~r~y~r~t~ c The present invention is use~ul in the field of ink jet printing, and has the advantage of allow~ng i~or a quasi-uniform surface den~ity coating over broad are~as ~i~h F-Yr~ nt ~_~L~ . ihil i ty over lor~g time period6. The coating ~v-,c ~ of the pre:~ent invention is particularly ussful when applied to a priating system wherein d~oplot~ of eqF-nrially i~rt;~l si2e and Yolume are },~v-l~c~d a~ high f.Lc~ h.,ie~ and can be individually celected to ei~hor print on a substrate or be captures and i nt~ y recirculated, It is an sdvantage of the pr~sent lnYention tha~ atin5c~ can be produced at a th~yl~ , of up to 120 inches/~rond It i8 a ~urther adYantage oi~ tbe presen~ inven~ion that the ~ni ~rm; ~y Of the coating can be tnade very reproducibly and at virtually any value of Cur~ace density Finally, it i~ an advantage o~ the pre3ent inYention that the versatility o~ ~he sy~tem is ~uch ~hat a varie~y o~ coating pattern can be produced in any numbe~ or order of ~he desired pattern-~ving described the invention in de~a~ l and by re~erence ~o the preferred ~
. ~
ther~o~, ir ~rill be apparent that other ~odi~i~ations and varia~ions are possible without departing from ~he scope o~ the in~r~n~iOn de~ined in the ~ '3~ claim~.
Claims (10)
1. A method for applying a surface coating to an ink jet printer substrate, the method comprising the steps of:
dissolving a coating substance in a carrier fluid to create a coating product;
applying a controllable pattern of discrete droplets of the coating product onto the substrate.
dissolving a coating substance in a carrier fluid to create a coating product;
applying a controllable pattern of discrete droplets of the coating product onto the substrate.
2. A method for applying a surface coating as claimed in claim 1 further comprising the step of applying multiple layers of the coating product to the substrate.
3. A method for applying a surface coating as claimed in claim 1 wherein the coating substance comprises a a medication.
4. A method for applying a surface coating as claimed in claim 3 wherein the medication is absorbable through skin.
5. A method for applying a surface coating as claimed in claim 3 wherein the medication is dissolvable in the carrier fluid.
6. A method for applying a surface coating as claimed in claim 1 wherein the coating substance comprises a steroid compound.
7. A method for applying a surface coating as claimed in claim 1 wherein the carrier fluid comprises alcohol.
8. A method for applying a surface coating as claimed in claim 1 wherein the carrier fluid comprises ethanol.
9. A method for applying a surface coating as claimed in claim 1 wherein the carrier fluid comprises water.
10. A method for applying a surface coating to an ink jet printer substrate, the method comprising the steps of:
providing a coating substance;
providing a carrier fluid;
mixing the coating substance and the carrier fluid to create a coating product;
printing the coating product on the substrate as a printed droplet;
allowing the carrier fluid to evaporate from the printed droplet;
leaving individual deposits of the coating substance on the substrate.
providing a coating substance;
providing a carrier fluid;
mixing the coating substance and the carrier fluid to create a coating product;
printing the coating product on the substrate as a printed droplet;
allowing the carrier fluid to evaporate from the printed droplet;
leaving individual deposits of the coating substance on the substrate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US53074995A | 1995-09-19 | 1995-09-19 | |
| US08/530,749 | 1995-09-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2185841A1 true CA2185841A1 (en) | 1997-03-20 |
Family
ID=24114800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2185841 Abandoned CA2185841A1 (en) | 1995-09-19 | 1996-09-18 | Continuous flow ink jet-type general purpose surface coating applicator |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0764525A3 (en) |
| JP (1) | JPH09187925A (en) |
| CA (1) | CA2185841A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4381342A (en) * | 1981-04-27 | 1983-04-26 | Eastman Kodak Company | Liquid jet method for coating photographic recording media |
| US4915950A (en) * | 1988-02-12 | 1990-04-10 | Cygnus Research Corporation | Printed transdermal drug delivery device |
| DE4024544A1 (en) * | 1990-08-02 | 1992-02-06 | Boehringer Mannheim Gmbh | ANALYZING ELEMENT AND METHOD FOR THE PRODUCTION THEREOF |
| DE69431436T2 (en) * | 1993-07-01 | 2003-07-31 | Tonejet Corp Pty Ltd | LIQUID INK FOR INK JET PRINTING |
-
1996
- 1996-09-18 EP EP96306774A patent/EP0764525A3/en not_active Withdrawn
- 1996-09-18 CA CA 2185841 patent/CA2185841A1/en not_active Abandoned
- 1996-09-19 JP JP24837496A patent/JPH09187925A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0764525A2 (en) | 1997-03-26 |
| EP0764525A3 (en) | 1997-10-08 |
| JPH09187925A (en) | 1997-07-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |
Effective date: 20020918 |