CA1101280A - Method of printing on material in sheet or web form - Google Patents
Method of printing on material in sheet or web formInfo
- Publication number
- CA1101280A CA1101280A CA291,289A CA291289A CA1101280A CA 1101280 A CA1101280 A CA 1101280A CA 291289 A CA291289 A CA 291289A CA 1101280 A CA1101280 A CA 1101280A
- Authority
- CA
- Canada
- Prior art keywords
- printing
- base material
- powder
- transfer
- web
- 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.)
- Expired
Links
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
- B41M5/025—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
- B41M5/0355—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 macromolecular coating or impregnation used to obtain dye receptive properties
Landscapes
- Printing Methods (AREA)
- Coloring (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method of printing on material in sheet or web form com-prises applying electrostatically a polyester powder to a surface to be printed of a base material, and bonding the polyester powder to the base material by heating, so that transfer printing can be effected in known manner on that surface.
A method of printing on material in sheet or web form com-prises applying electrostatically a polyester powder to a surface to be printed of a base material, and bonding the polyester powder to the base material by heating, so that transfer printing can be effected in known manner on that surface.
Description
8~
The invention relates -to a method of printing on material in sheet or web form on which material direct printing by the transfer method is not possible.
For printing on textiles and other materials which have good receptivity for subliming inks the transfer printing process has been very successful in recent years. This process is based on transferring special inks from a printed paper, the so-called transfer paper, in a calender or press to the textile web by the action of heat and pressure, the special inks used for this pur- .
pose subliming into and being bonded to the textile fabric~
This transfer printing process has hitherto been success- `
; ful for only a very limited range of materials, mainly textiles, because these havegood receptivity for the printing inks. For example it would not be possible to print on wood or sheet metal by the transfer printing process known hitherto.
Materials of this kind are at present printed after suit- -able pretreatment, for example after applying a coa-ting of var-nish to the surface which is to be printed. The varnish must how-ever contain a plasticiser, which has the disadvantage that after a time the printed image smudges because the plasticiser begins to diffuse. Printing on wood is currently effected by very expensive presses.
The problem underlying the present invention is that of enabling the transfer printing process to be applied to materials in sheet or web form whatever their composition.
According to the invention there is provided a method of pretreating material in sheet or web form which material is to be used for printing by the transfer method, said method comprising ; applying electrostatically a polyester powder to a surface to be printed of a base material on which base material direct printing
The invention relates -to a method of printing on material in sheet or web form on which material direct printing by the transfer method is not possible.
For printing on textiles and other materials which have good receptivity for subliming inks the transfer printing process has been very successful in recent years. This process is based on transferring special inks from a printed paper, the so-called transfer paper, in a calender or press to the textile web by the action of heat and pressure, the special inks used for this pur- .
pose subliming into and being bonded to the textile fabric~
This transfer printing process has hitherto been success- `
; ful for only a very limited range of materials, mainly textiles, because these havegood receptivity for the printing inks. For example it would not be possible to print on wood or sheet metal by the transfer printing process known hitherto.
Materials of this kind are at present printed after suit- -able pretreatment, for example after applying a coa-ting of var-nish to the surface which is to be printed. The varnish must how-ever contain a plasticiser, which has the disadvantage that after a time the printed image smudges because the plasticiser begins to diffuse. Printing on wood is currently effected by very expensive presses.
The problem underlying the present invention is that of enabling the transfer printing process to be applied to materials in sheet or web form whatever their composition.
According to the invention there is provided a method of pretreating material in sheet or web form which material is to be used for printing by the transfer method, said method comprising ; applying electrostatically a polyester powder to a surface to be printed of a base material on which base material direct printing
- 2 -, ~
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by the transfer method is not possible, and bonding the polyester powder to the base material by heating, so that -transfer printing can be effected on that surface.
By coating the surface of the base material with poly-ester, the surface is prepared for transfer prin-ting, so that con-ventional printing by the transfer process is immediately possible on materials pre-treated by the method of the invention. The ~ ~
field of application of the transfer printing process is consid- ~ ;
erably widened since the invention makes possible printing on materials which could only be printed hereto at high cost and in some cases with unsatisfactory results. This is because pre- `;
treatment of the base materials makes available all the advantages of the transfer printing process, particularly low investmen-t cost, speed, high printing quality - even in colour shading - and inexpensive printing.
For printing on surfaces of materials which are only slightly or not at all electrically conductive it is preferable to apply to the base material a medium having good electrical conductivity before applying the polysster powder. This medium makes the surface electrically conductive. If the mediwm is an adhesive, it will effect additional bonding between the surface and the plastics material.
The method of the invention can be applied continuously ;-or discontinuously in a press. ~-In order that thç invention may be more clearly under- -stood an embodiment thereof will now be described, by way of example, with reference to the accompanying single drawing which shows diagrammatically the essential components of a B
continuously operating installation for printing on a web o~ material.
Polyester powder is contained in a reservoir 1 of electrically conductive material. The reservoir 1 is conn-ected to the negative pole of a high-voltage source and has sieve openings in its bottom surface. Powder passing through these sieve openings is thus negatively charged. A web 2 of material to be printed travels under the reservoir. In the embodiment described the web is of sheet metal, for example aiuminium. The web of material is positively charged. The passage of the powder through the bottom of the reservoir 1 can be assisted in known manner by rotating brushes. The sense of connection o~ the reservoir and web o~ material to the high-voltage source may be reversed. Flocking ¦ installations of this kind are kno~ and the installation will not be described in greater detail. The voltage between the electrodes of the flocking installa-tion is preferably between 80 and 100 Kv~ During operation a current of about 0.5 to 5 milliamperes flows. The reservoir 1 represents in general an electrostatic flocking installation, which could also be in the form o~ a gun. The electrostatic forces can be assisted in known manner by compressed air and other means, for example rotating brushes. The plastics powder applied by the electrosta-tic forces to the web 2 of material is represented by the arrows 3.
When printing is to be on a web of material which is only slightly or not at all electrically conductive, a medium having good electrical conductivity~ preferably a suitable adhesive, which can be connected to direct voltage, is applied to the web before it reaches the reservoir 1. This electrically conductive medium bonds the plastics powder to `l 4 the webO A metal plate may also be provided under the web in the region of the reservoir 1. A uniform layer of elec-trostatic powder can thus be deposited on the surface of the web. Polyester powder is particularly suitablep because polyester accepts the transfer inks~ Pigmented polyester powder may be used if it is desired to print by the transfer process on a co oured layer of plastics materialO Polyester powder is also preferred in order to obtain printing which does not fade when exposed to light and is resistant to abrasion.
A conveyor device 4 for the web includes a drying tunnel 5 which is si-tuated downstream of the elec-trostatic coating installation represented by the reservoir 1. In the tunnel $ the web 2, coated with plastics powder and optionally with adhesive, is heated to a temperature between about 150C and 220C. The plastics powder is thereby sintered.
The treated web then passes to a transfer printing station 6. Transfer printing paper 7 passes around two rol-lers 8 which are in intimate contact with the web 2 to be printed. The print is thus transferred from the transfer printing paper 7 to the surface of the web 2. This transfer is effected by the application of heat and pressure. The used trans~er printing paper is fed away as indicated at 9. ~uring the printing process an endless bel-t 10 is applied against the printing paper 7.
At the end of these stages sf the process the printed web 2 emerges.
The method of the invention may also be carried out discontinuously, in a press in similar manner to the contin-uous method just described7 Pieces o~ web or sheets of .
... .. . . . . . .
2~C~
.
electrically Gonductive material are prepared by electro statically coating of their surfaces with the plastics material, followed by sintering and finally printing by a transfer process in the press.
When printing webs of non-conductive material the electrostatic coating step is preceded by coating with an adhesive or other electrically conductive medium.
Surfaces printed in this manner are abrasicn resistant and fast to light and comply with foodstuffs regulàtions.
~ .
, 6 - J
'
z~
by the transfer method is not possible, and bonding the polyester powder to the base material by heating, so that -transfer printing can be effected on that surface.
By coating the surface of the base material with poly-ester, the surface is prepared for transfer prin-ting, so that con-ventional printing by the transfer process is immediately possible on materials pre-treated by the method of the invention. The ~ ~
field of application of the transfer printing process is consid- ~ ;
erably widened since the invention makes possible printing on materials which could only be printed hereto at high cost and in some cases with unsatisfactory results. This is because pre- `;
treatment of the base materials makes available all the advantages of the transfer printing process, particularly low investmen-t cost, speed, high printing quality - even in colour shading - and inexpensive printing.
For printing on surfaces of materials which are only slightly or not at all electrically conductive it is preferable to apply to the base material a medium having good electrical conductivity before applying the polysster powder. This medium makes the surface electrically conductive. If the mediwm is an adhesive, it will effect additional bonding between the surface and the plastics material.
The method of the invention can be applied continuously ;-or discontinuously in a press. ~-In order that thç invention may be more clearly under- -stood an embodiment thereof will now be described, by way of example, with reference to the accompanying single drawing which shows diagrammatically the essential components of a B
continuously operating installation for printing on a web o~ material.
Polyester powder is contained in a reservoir 1 of electrically conductive material. The reservoir 1 is conn-ected to the negative pole of a high-voltage source and has sieve openings in its bottom surface. Powder passing through these sieve openings is thus negatively charged. A web 2 of material to be printed travels under the reservoir. In the embodiment described the web is of sheet metal, for example aiuminium. The web of material is positively charged. The passage of the powder through the bottom of the reservoir 1 can be assisted in known manner by rotating brushes. The sense of connection o~ the reservoir and web o~ material to the high-voltage source may be reversed. Flocking ¦ installations of this kind are kno~ and the installation will not be described in greater detail. The voltage between the electrodes of the flocking installa-tion is preferably between 80 and 100 Kv~ During operation a current of about 0.5 to 5 milliamperes flows. The reservoir 1 represents in general an electrostatic flocking installation, which could also be in the form o~ a gun. The electrostatic forces can be assisted in known manner by compressed air and other means, for example rotating brushes. The plastics powder applied by the electrosta-tic forces to the web 2 of material is represented by the arrows 3.
When printing is to be on a web of material which is only slightly or not at all electrically conductive, a medium having good electrical conductivity~ preferably a suitable adhesive, which can be connected to direct voltage, is applied to the web before it reaches the reservoir 1. This electrically conductive medium bonds the plastics powder to `l 4 the webO A metal plate may also be provided under the web in the region of the reservoir 1. A uniform layer of elec-trostatic powder can thus be deposited on the surface of the web. Polyester powder is particularly suitablep because polyester accepts the transfer inks~ Pigmented polyester powder may be used if it is desired to print by the transfer process on a co oured layer of plastics materialO Polyester powder is also preferred in order to obtain printing which does not fade when exposed to light and is resistant to abrasion.
A conveyor device 4 for the web includes a drying tunnel 5 which is si-tuated downstream of the elec-trostatic coating installation represented by the reservoir 1. In the tunnel $ the web 2, coated with plastics powder and optionally with adhesive, is heated to a temperature between about 150C and 220C. The plastics powder is thereby sintered.
The treated web then passes to a transfer printing station 6. Transfer printing paper 7 passes around two rol-lers 8 which are in intimate contact with the web 2 to be printed. The print is thus transferred from the transfer printing paper 7 to the surface of the web 2. This transfer is effected by the application of heat and pressure. The used trans~er printing paper is fed away as indicated at 9. ~uring the printing process an endless bel-t 10 is applied against the printing paper 7.
At the end of these stages sf the process the printed web 2 emerges.
The method of the invention may also be carried out discontinuously, in a press in similar manner to the contin-uous method just described7 Pieces o~ web or sheets of .
... .. . . . . . .
2~C~
.
electrically Gonductive material are prepared by electro statically coating of their surfaces with the plastics material, followed by sintering and finally printing by a transfer process in the press.
When printing webs of non-conductive material the electrostatic coating step is preceded by coating with an adhesive or other electrically conductive medium.
Surfaces printed in this manner are abrasicn resistant and fast to light and comply with foodstuffs regulàtions.
~ .
, 6 - J
'
Claims (8)
1. A method of pretreating material in sheet or web form, which material is to be used for printing by the transfer method, said method comprising applying electrostatically a polyester pow-der to a surface to be printed of a base material on which base material direct printing by the transfer method is not possible, and bonding the polyester powder to the base material by heating, so that transfer printing can be effected on that surface.
2. A method according to claim 1, wherein for printing on a surface of said base material which is only slightly or not at all electrically conductive, a medium having good electrical con-ductivity is applied to the base material before the polyester powder is applied.
3. A method according to claim 1 wherein in order to apply said polyester powder, said powder is negatively charged and said base material is positively charged.
4. A method according to claim 1 or 3 wherein said base material is sheet metal.
5. A method according to claim 1 or 3 wherein said powder is contained in a reservoir prior to application and said reservoir is connected to a high-voltage source, and wherein the volta?e between the electrodes of said source is between 80 and 100 Kv.
6. A method according to claim 2 wherein said medium is an adhesive which can be connected to direct voltage.
7. A method according to claim 1, 2, or 6 wherein said polyester powder is heated to a temperature between 150°C and 220°C in order to sinter the powder.
8. A method according to claim 1, 2, or 6 including the additional step of effecting transfer printing on the coated surface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2713484.5-45 | 1977-03-26 | ||
| DE19772713484 DE2713484C2 (en) | 1977-03-26 | 1977-03-26 | Process for printing on sheet-like or web-shaped materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1101280A true CA1101280A (en) | 1981-05-19 |
Family
ID=6004794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA291,289A Expired CA1101280A (en) | 1977-03-26 | 1977-11-21 | Method of printing on material in sheet or web form |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS53123215A (en) |
| AU (1) | AU505553B2 (en) |
| BE (1) | BE860988A (en) |
| CA (1) | CA1101280A (en) |
| DE (1) | DE2713484C2 (en) |
| FR (1) | FR2384631B1 (en) |
| GB (1) | GB1557503A (en) |
| NL (1) | NL7712603A (en) |
| SE (1) | SE413230B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4201821A (en) * | 1978-12-22 | 1980-05-06 | Howard A. Fromson | Decorated anodized aluminum article |
| DE3132693A1 (en) * | 1981-08-19 | 1983-03-17 | Herberts Gmbh, 5600 Wuppertal | METHOD FOR CONTINUOUSLY PRINTING A METAL FILM COATED WITH PLASTIC |
| FR2521489A1 (en) * | 1982-02-18 | 1983-08-19 | Schuhl Jean | Thermo-transfer printing with sublimable dyes or inks - using hard transport coated with synthetic resin |
| DE3525824C1 (en) * | 1985-07-19 | 1986-11-06 | Transfertex GmbH & Co Thermodruck KG, 8752 Kleinostheim | Process for printing on materials that cannot be directly printed in transfer printing |
| GB2268906A (en) † | 1992-07-24 | 1994-01-26 | Portals Ltd | Counterfeit protection for documents using optical effects of liquid crystal |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1352307A (en) * | 1963-02-05 | 1964-02-14 | Sames Mach Electrostat | Electrostatic powder coating improvements |
| FR2097592A5 (en) * | 1970-07-15 | 1972-03-03 | Aquitaine Total Organico | Plastics coating of metals - with pvc or polyamide using primer coated metal |
| GB1444368A (en) * | 1973-03-20 | 1976-07-28 | Ici Ltd | Colouration process |
| DE2450260A1 (en) * | 1974-10-23 | 1976-05-06 | Jenaer Glaswerk Schott & Gen | Electrostatically coating glass articles with synthetic resins - after applying electrically conducting tin dioxide layer having specified conductivity |
-
1977
- 1977-03-26 DE DE19772713484 patent/DE2713484C2/en not_active Expired
- 1977-11-16 NL NL7712603A patent/NL7712603A/en active Search and Examination
- 1977-11-16 SE SE7712946A patent/SE413230B/en not_active IP Right Cessation
- 1977-11-18 BE BE182758A patent/BE860988A/en not_active IP Right Cessation
- 1977-11-21 CA CA291,289A patent/CA1101280A/en not_active Expired
- 1977-11-23 FR FR7735183A patent/FR2384631B1/en not_active Expired
- 1977-11-30 AU AU31092/77A patent/AU505553B2/en not_active Expired
- 1977-12-02 GB GB5035277A patent/GB1557503A/en not_active Expired
- 1977-12-05 JP JP14520777A patent/JPS53123215A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2384631A1 (en) | 1978-10-20 |
| GB1557503A (en) | 1979-12-12 |
| JPS53123215A (en) | 1978-10-27 |
| BE860988A (en) | 1978-03-16 |
| DE2713484B1 (en) | 1978-05-11 |
| AU505553B2 (en) | 1979-11-22 |
| NL7712603A (en) | 1978-09-28 |
| DE2713484C2 (en) | 1979-01-25 |
| AU3109277A (en) | 1979-06-07 |
| SE413230B (en) | 1980-05-12 |
| SE7712946L (en) | 1978-09-27 |
| FR2384631B1 (en) | 1986-03-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |