US3301697A - Thermographic transfer sheet having a support of a paper and plastic coating and the method of use - Google Patents

Thermographic transfer sheet having a support of a paper and plastic coating and the method of use Download PDF

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US3301697A
US3301697A US73245A US7324560A US3301697A US 3301697 A US3301697 A US 3301697A US 73245 A US73245 A US 73245A US 7324560 A US7324560 A US 7324560A US 3301697 A US3301697 A US 3301697A
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transfer sheet
sheet
coating
transfer
copy sheet
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Robert B Russell
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    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/914—Transfer or decalcomania

Definitions

  • thermographic copying relates to thermographic copying and more particularly to an improved transfer sheet of the type described and claimed generically in my prior and copending application Serial No. 68,286, filed November 9, 1960, now U.S. Patent 3,131,080, entitled Thermographic Copying Process and Transfer Sheet Therefor.
  • the objects of this invention are essentially to provide an improved transfer sheet for use in the process which I call Prestofax and which is more specifically described in my above said copending application.
  • the salient features of Prestofax which call for a special form of transfer sheet are: (a) the transfer sheet serves as a tensioning belt to press the copy sheet against the original; (b) the incident radiation strikes the exposed back side of the transfer sheet; and (c) the transfer sheet is separated from the copy sheet at a critical moment following irradiation.
  • the object then of this invention is to provide a transfer sheet which is designed specifically for improved performance under those special conditions.
  • the advantages of this form of invention are several.
  • the paper base provides dimensional stability and resistance to heat.
  • the unreinforced plastic transfer sheets of FIGS. 2, 3 and 5 of my above-said prior application print remarkably well, but they can become weak when heated. This is usually not a serious problem, but during extended periods of use the lamp and reflector absorb a great deal of heat, and thereafter when the machine is idle this residual heat tends to weaken the unreinforced plastic transfer sheet of those examples.
  • the plastic sheet is laminated to a paper base, as herein described, the result is a dimensionally stable and heat resistant transfer sheet.
  • Another advantage of this form of the invention is that the dyed or pigmented heat meltable coating overlies a smooth, relatively uniform, and highly conductive surface which is also made dimensionally stable under heat by the paper backer. These factors lead to high uniformity and clarity in the printed image.
  • the single figure shows a simple paper backer carrying a clear plastic coating or lamination and a dyed or pigmented heat meltable coating, overlying a mineral coated copy sheet, which in turn overlies an original.
  • the paper base may be any suitable sheet. I have used Monarco (S. D. Warren Co.) with excellent results. A relatively thin, smooth and uniform sheet is desirable, but not required. Cost is probably the major consideration in the selection of the paper backer and accordingly, the least expensive sheet per foot having suflicient strength, when laminated, to serve as the tensioning belt in Prestofax is adequate.
  • the clear plastic coating is also a matter of choice. Regenerated cellulose, cellulose acetate, PVC, PVA, polystyrene, polyethylene, nylon, Teflon, and Mylar and the like substances are all satisfactory. The main thing is to provide a smooth, homogeneous and highly conductive (as compared to paper) surface to receive the heat meltable coating and its melting point must be substantially higher than that of the heat meltable coating.
  • the heat meltable coating may be a Wax or other similar substance. I find that a melting point of about F. to F. is entirely satisfactory. Parafiin and microcrystalline Waxes are suitable. A sharp melting point is also desirable.
  • the dye can be any one of numerous dyes, having low infra-red absorptivity. Various forms of pigment have also been used with success.
  • the type of coloring matter employed is not critical provided it is not highly absorbent of infra-red radiation. In fact, I intend herein to claim the heat meltable coating broadly enough to cover it whether or not it contains coloring matter.
  • a transfer sheet for thermographic copying in which the transfer sheet serves as a tensioning belt and is exposed to the direct radiation of a source of radiation, said transfer sheet comprising: a paper base, a clear plastic coating on said base, and a heat meltable coating on said plastic having a melting point substantially lower than the melting point of said plastic coating.
  • the transfer sheet defined in claim 1 further characterized by said heat meltable coating containing coloring matter which is essentially transparent to infra-red radiation.
  • the improvement which comprises using as the transfer sheet one which is free of materials that absorb suflicient amounts of infrared radiation on instantaneous exposure thereto to cause transfer of the imaging layer and is comprised of a thin paper foundation having on one surface thereof a non-melting, non-transferable plastic intermediate layer and a top heat-transferable imaging layer based upon wax binder material, said transfer sheet being heat resistant and dimensionally stable at the melting temperature of the said imaging layer whereby the portions of the imaging layer that are transferred to the

Description

Jan. 31, 1967 R. B. RUSSELL 3 1, 9
THERMOGRAPHIC TRANSFER SHEET HAVING A SUPPORT OF A PAPER AND PLASTIC COATING AND THE METHOD OF USE Filed Dec. 2, 1960 PAPFR BACKER K I, DIED OR PlGMENTED HEAT MELTABLE OATl Ng QXICEQ CO PY\ SHEET l f 5/ XMP l r r .I l
/ MINERAL co An Ne/ I ORIGINAL INVENTOR. Kim 6 BY 13 W36 United States Patent 3,301,697 THERMOGRAPI-IIC TRANSFER SHEET HAVING A SUPPORT OF A PAPER AND PLASTIC COATING AND THE METHOD OF USE Robert B. Russell, 248 Park St., Newton, Mass. 02158 Filed Dec. 2, 1960, Ser. No. 73,245
Claims. (Cl. 119-36.4)
This invention relates to thermographic copying and more particularly to an improved transfer sheet of the type described and claimed generically in my prior and copending application Serial No. 68,286, filed November 9, 1960, now U.S. Patent 3,131,080, entitled Thermographic Copying Process and Transfer Sheet Therefor.
In my said prior application, five species are claimed, and it is my intention herein to claim a sixth species coming within the general purview and mode of operation of the invention of that application.
The objects of this invention are essentially to provide an improved transfer sheet for use in the process which I call Prestofax and which is more specifically described in my above said copending application. The salient features of Prestofax which call for a special form of transfer sheet are: (a) the transfer sheet serves as a tensioning belt to press the copy sheet against the original; (b) the incident radiation strikes the exposed back side of the transfer sheet; and (c) the transfer sheet is separated from the copy sheet at a critical moment following irradiation. The object then of this invention is to provide a transfer sheet which is designed specifically for improved performance under those special conditions.
In the invention described herein, I accomplish this object by applying to a paper base a smooth coating of a clear plastic, and thereafter coating the plastic with a dyed (or pigmented) heat meltable coating.
The advantages of this form of invention are several. The paper base provides dimensional stability and resistance to heat. The unreinforced plastic transfer sheets of FIGS. 2, 3 and 5 of my above-said prior application print remarkably well, but they can become weak when heated. This is usually not a serious problem, but during extended periods of use the lamp and reflector absorb a great deal of heat, and thereafter when the machine is idle this residual heat tends to weaken the unreinforced plastic transfer sheet of those examples. However, when the plastic sheet is laminated to a paper base, as herein described, the result is a dimensionally stable and heat resistant transfer sheet.
Another advantage of this form of the invention is that the dyed or pigmented heat meltable coating overlies a smooth, relatively uniform, and highly conductive surface which is also made dimensionally stable under heat by the paper backer. These factors lead to high uniformity and clarity in the printed image.
The single figure shows a simple paper backer carrying a clear plastic coating or lamination and a dyed or pigmented heat meltable coating, overlying a mineral coated copy sheet, which in turn overlies an original.
The paper base may be any suitable sheet. I have used Monarco (S. D. Warren Co.) with excellent results. A relatively thin, smooth and uniform sheet is desirable, but not required. Cost is probably the major consideration in the selection of the paper backer and accordingly, the least expensive sheet per foot having suflicient strength, when laminated, to serve as the tensioning belt in Prestofax is adequate.
The clear plastic coating is also a matter of choice. Regenerated cellulose, cellulose acetate, PVC, PVA, polystyrene, polyethylene, nylon, Teflon, and Mylar and the like substances are all satisfactory. The main thing is to provide a smooth, homogeneous and highly conductive (as compared to paper) surface to receive the heat meltable coating and its melting point must be substantially higher than that of the heat meltable coating.
, The heat meltable coating may be a Wax or other similar substance. I find that a melting point of about F. to F. is entirely satisfactory. Parafiin and microcrystalline Waxes are suitable. A sharp melting point is also desirable.
The dye can be any one of numerous dyes, having low infra-red absorptivity. Various forms of pigment have also been used with success. The type of coloring matter employed is not critical provided it is not highly absorbent of infra-red radiation. In fact, I intend herein to claim the heat meltable coating broadly enough to cover it whether or not it contains coloring matter.
In connection With the use of pigment, I find that a mineral coated copy sheet is markedly better than a simple unfilled and uncoated sheet. Apparently the pigment has a filtering action which is particularly suitable for mineral coated paper. Accordingly, I also intend to claim this feature specifically herein. In addition, I have found that a sheet which is coated only on one side makes markedly better copy when the coated side is placed facing the original, and I also intend to claim this combination specifically herein.
Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:
I claim:
1. A transfer sheet for thermographic copying in which the transfer sheet serves as a tensioning belt and is exposed to the direct radiation of a source of radiation, said transfer sheet comprising: a paper base, a clear plastic coating on said base, and a heat meltable coating on said plastic having a melting point substantially lower than the melting point of said plastic coating.
2. The transfer sheet defined in claim 1 further characterized by said heat meltable coating containing coloring matter which is essentially transparent to infra-red radiation.
3. A transfer and copy sheet combination for use in a thermographic copying process in which the transfer sheet serves as a tensioning member, said combination including a heat meltable coating on said transfer sheet, a mineral coating on said copy sheet, said coating on said transfer sheet facing toward said copy sheet, and said coating on said copy sheet facing away from said transfer sheet.
4. The transfer and copy sheet defined in claim 3 further characterized by a coloring pigment in said heat meltable coating.
5. In the process of imaging a copy sheet comprising the steps of superposing original infrared radiationabsorbing images together with a copy sheet and a transfer sheet having a heat-transferable imaging layer, the imaging layer being in intimate surface contact with the surface of the copy sheet, and applying thereto infrared radiations which are absorbed by the original images and converted to heat patterns in the shapes of said images, thereby heating corresponding portions of the imaging layer and causing them to melt and transfer to the copy sheet in areas corresponding to the locations and shapes of the original images, the improvement which comprises using as the transfer sheet one which is free of materials that absorb suflicient amounts of infrared radiation on instantaneous exposure thereto to cause transfer of the imaging layer and is comprised of a thin paper foundation having on one surface thereof a non-melting, non-transferable plastic intermediate layer and a top heat-transferable imaging layer based upon wax binder material, said transfer sheet being heat resistant and dimensionally stable at the melting temperature of the said imaging layer whereby the portions of the imaging layer that are transferred to the copy sheet form clear and uniform images.
References Cited by the Examiner UNITED STATES PATENTS Newman 11736 Miller 25065 Roshkind 250-65 Tien 25065 Clark 117-36.4
4 2,999,035 9/1961 Sahler 250-65 X 3,024,362 3/1962 Sus et a1. 250-65 3,037,879 6/1962 Newman et a1 11736.1
FOREIGN PATENTS 722,023 1/ 1955 Great Britain.
RALPH G. NILSON, Primary Examiner.
W. F. LINDQUIST, I. W. LAWRENCE, H. S. MILLER, 10 Assistant Examiners.

Claims (3)

1. A TRANSFER SHEET FOR THERMOGRAPHIC COPYING IN WHICH THE TRANSFER SHEET SERVES AS A TENSIONING BELT AND IS EXPOSED TO THE DIRECT RADIATION OF A SOURCE OF RADIATION, SAID TRANSFER SHEET COMPRISING: A PAPER BASE, A CLEAR PLASTIC COATING ON SAID BASE, AND A HEAT MELTABLE COATING ON SAID PLASTIC HAVING A MELTING POINT SUBSTANTIALLY LOWER THAN THE MELTING POINT OF SAID PLASTIC COATING.
3. A TRANSFER AND COPY SHEET COMBINATION FOR USE IN A THERMOGRAPHIC COPYING PROCESS IN WHICH THE TRANSFER SHEET SERVES AS A TENSIONING MEMBER, SAID COMBINATION INCLUDING A HEAT MELTABLE COATING ON SAID TRANSFER SHEET, A MINERAL COATING ON SAID COPY SHEET, SAID COATING ON SAID TRANSFER SHEET FACING TOWARD SAID COPY SHEET, AND SAID COATING ON SAID COPY SHEET FACING AWAY FROM SAID TRANSFER SHEET.
5. IN THE PROCESS OF IMAGING A COPY SHEET COMPRISING THE STEPS OF SUPERPOSING ORIGINAL INFRARED RADIATIONABSORBING IMAGES TOGETHER WITH A COPY SHEET AND A TRANSFER SHEET HAVING A HEAT-TRANSFERABLE IMAGING LAYER, THE IMAGING LAYER BEING IN INTIMATE SURFACE CONTACT WITH THE SURFACE OF THE COPY SHEET, AND APPLYING THERETO INFRARED RADIATIONS WHICH ARE ABSORBED BY THE ORIGINAL IMAGES AND CONVERTED TO HEAT PATTERNS IN THE SHAPES OF SAID IMAGES, THEREBY HEATING CORRESPONDING PORTIONS OF THE IMAGING LAYER AND CAUSING THEM TO MELT AND TRASFER TO THE COPY SHEET IN AREAS CORRESPONDING TO THE LOCATIONS AND SHAPES OF THE ORIGINAL IMAGES, THE IMPROVEMENTWHICH COMPRISES USING AS THE TRANSFER SHEET ONE WHICH IS FREE OF MATERIALS THAT ABSORB SUFFICIENT AMOUNTS OF INFRARED RADIATION ON INSTATANEOUS EXPOSURE THERETO TO CAUSE TRANSFER OF THE IMAGING LAYER AND IS COMPRISED OF A THIN PAPER FOUNDATION HAVING ON ONE SURFACE THEREOF A NON-MELTING, NON-TRANSFERABLE PLASTIC INTERMEDIATE LAYER AND A TOP HEAT-TRANSFERABLE IMAGING LAYER BASED UPON WAX BINDER MATERIAL, SAID TRANSFER SHEET BEING HEAT RESISTANT AND DIMENSIONALLY STABLE AT THE MELTING TEMPERATURE OF THE SAID IMAGING LAYER WHEREBY THE PORTIONS OF THE IMAGING LAYER THAT ARE TRANSFERRED TO THE COPY SHEET FORM CLEAR AND UNIFORM IMAGES.
US73245A 1960-12-02 1960-12-02 Thermographic transfer sheet having a support of a paper and plastic coating and the method of use Expired - Lifetime US3301697A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3570380A (en) * 1968-06-07 1971-03-16 Olivetti & Co Spa Impactless typewriter
US3767394A (en) * 1971-02-02 1973-10-23 Minnesota Mining & Mfg Color copying and sheet material therefor
US4327128A (en) * 1979-12-07 1982-04-27 Dennison Manufacturing Company Transfer coating methods, compositions and products
US4365254A (en) * 1979-08-31 1982-12-21 Nippon Telegraph And Telephone Public Corp. Two-color recording paper and method and recording apparatus utilizing _the two-color recording paper
EP0096740A1 (en) * 1982-06-15 1983-12-28 International Business Machines Corporation Laminated transfer medium for thermal printing and lift-off correction
EP0113167A2 (en) * 1982-10-14 1984-07-11 Autotype International Limited Laser imaging materials
EP0187449A2 (en) * 1984-11-02 1986-07-16 Tomoegawa Paper Manufacturing Company Limited Thermosensitive recording material

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2508725A (en) * 1945-01-13 1950-05-23 Columbia Ribbon & Carbon Transfer medium
GB722023A (en) * 1950-11-01 1955-01-19 Dick Co Ab Improvements in or relating to method for preparing copy
US2740895A (en) * 1950-08-21 1956-04-03 Minnesota Mining & Mfg Thermoprinting apparatus
US2769391A (en) * 1951-11-14 1956-11-06 Dick Co Ab Method of manufacturing imaged hectograph spirit master
US2939009A (en) * 1956-02-01 1960-05-31 Jack M Tien Thermotransfer duplicating process
US2943952A (en) * 1956-12-14 1960-07-05 Burroughs Corp Method of making duplicating transfer sheet and resultant article
US2999035A (en) * 1958-03-08 1961-09-05 Keuffel & Esser Co Heat sensitive reproduction sheet, method of making and method of using
US3024362A (en) * 1958-08-09 1962-03-06 Kalle Ag Heat sensitive reproduction material and mbthod of using same
US3037879A (en) * 1959-09-24 1962-06-05 Columbia Ribon And Carbon Mfg Re-usable ink-releasing elements and process of making

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2508725A (en) * 1945-01-13 1950-05-23 Columbia Ribbon & Carbon Transfer medium
US2740895A (en) * 1950-08-21 1956-04-03 Minnesota Mining & Mfg Thermoprinting apparatus
GB722023A (en) * 1950-11-01 1955-01-19 Dick Co Ab Improvements in or relating to method for preparing copy
US2769391A (en) * 1951-11-14 1956-11-06 Dick Co Ab Method of manufacturing imaged hectograph spirit master
US2939009A (en) * 1956-02-01 1960-05-31 Jack M Tien Thermotransfer duplicating process
US2943952A (en) * 1956-12-14 1960-07-05 Burroughs Corp Method of making duplicating transfer sheet and resultant article
US2999035A (en) * 1958-03-08 1961-09-05 Keuffel & Esser Co Heat sensitive reproduction sheet, method of making and method of using
US3024362A (en) * 1958-08-09 1962-03-06 Kalle Ag Heat sensitive reproduction material and mbthod of using same
US3037879A (en) * 1959-09-24 1962-06-05 Columbia Ribon And Carbon Mfg Re-usable ink-releasing elements and process of making

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3570380A (en) * 1968-06-07 1971-03-16 Olivetti & Co Spa Impactless typewriter
US3767394A (en) * 1971-02-02 1973-10-23 Minnesota Mining & Mfg Color copying and sheet material therefor
US4365254A (en) * 1979-08-31 1982-12-21 Nippon Telegraph And Telephone Public Corp. Two-color recording paper and method and recording apparatus utilizing _the two-color recording paper
US4327128A (en) * 1979-12-07 1982-04-27 Dennison Manufacturing Company Transfer coating methods, compositions and products
EP0096740A1 (en) * 1982-06-15 1983-12-28 International Business Machines Corporation Laminated transfer medium for thermal printing and lift-off correction
US4453839A (en) * 1982-06-15 1984-06-12 International Business Machines Corporation Laminated thermal transfer medium for lift-off correction and embodiment with resistive layer composition including lubricating contact graphite coating
EP0113167A2 (en) * 1982-10-14 1984-07-11 Autotype International Limited Laser imaging materials
EP0113167A3 (en) * 1982-10-14 1986-06-18 Autotype International Limited Laser imaging materials
EP0187449A2 (en) * 1984-11-02 1986-07-16 Tomoegawa Paper Manufacturing Company Limited Thermosensitive recording material
EP0187449A3 (en) * 1984-11-02 1988-06-01 Tomoegawa Paper Manufacturing Company Limited Thermosensitive recording material

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