DE1206918B - Process for marking original sheets to be used in thermographic duplication processes - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B 41 c

German KL: 15 b-4/01

Number: 1206 918

File number: C 27753 VI b / 15 b

Filing date: August 20, 1962

Display day: 1.6. December 1965

The invention relates to an improved method for inscribing which works with new carbon papers of original sheets that are thermographically used for labeling z. B. hectographic Die arches can be used.

Processes for thermographic labeling of hectographic matrix sheets have been around since known for some time. According to the known methods, an infrared radiation is absorbed A sheet carrying pictographs an unlabeled stencil sheet and a hectographic transfer sheet, whose transfer material does not absorb infrared radiation. The superimposed Sheets are then exposed to infrared radiation from the lettering on the original sheet is absorbed, converted into heat and the transfer printing material in the appropriate places of the transfer sheet melts. This melted transfer material then flows onto the or adheres to it the matrix arches in contact with it, and after separating the arches one obtains one hectographic matrix sheets with reproducible hectographic image areas that correspond to the Corresponding image areas located in the original sheet directly or in a mirror-inverted manner.

Many difficulties have arisen in carrying out such procedures. The exposure time each different original sheet with infrared radiation varies according to the absorption properties of the composition from which the Image areas exist. Experiments must be carried out to determine the correct exposure time and intensity be carried out, in which the written original, the stencil sheets and the hectographic Transfer sheets are exposed to infrared radiation. Insufficient exposure results in insufficient Transfer of the hectographic composition, and there the arches only once whole can be placed exactly on top of each other, transfer sheets and stencil sheets are lost in this way. Too much exposure also results in a loss of time and material, and in some cases becomes the one used due to the melting and deliquescence of the hectographic composition Facility contaminated.

A further difficulty arises with preprinted stencil sheets, the stencils having a preprint on one side which was applied using printing inks which absorb infrared radiation. In such matrices, the free spaces can be marked using infrared radiation absorbing transfer printing materials
thermographic duplication process
original sheets to be used

Applicant:

Columbia Ribbon and
Carbon Manufacturing Co., Inc.,
Glen Cove, Long Island, NY (V. St. A.)

Representative:

Dipl.-Ing. E. Prince, Dr. rer. nat. G. Hauser
and Dipl.-Ing. G. Leiser, patent attorneys,
Munich-Pasing, Ernsbergerstr. 19th

Named as inventor:
Douglas Alexander Newman,
Glen Cove, Long Island, NY (V. St. A.)

Claimed priority:

V. St. ν. America August 21, 1961 (132 839)

filled in and then labeled thermographically with hectographic composition. The problem is that conventional radiation-absorbing transfer printing materials generate heat in different ways, depending on their composition, and this heat generation in turn differs from that of the preprint on the matrix sheet. If, therefore, the stencil sheet is exposed to such an extent that the pre-print on it generates the required heat, the image areas from the transfer material located on the stencil sheet are overheated and melt, whereby they spread to form a divergent heat pattern, so that a smeared image on the stencil sheet hectographic image is transmitted.
One attempt to solve the problem of the uneven lettering of the original sheet consists in the use of a transfer sheet or carbon paper which can be attached to the original or stencil sheets and which carries a transfer material which is uniformly and strongly pigmented with infrared radiation absorbing substances.

It has now been found that, although sharp original images with uniform infrared

509 758/27

3 4

radiation-absorbing, heat-generating self- The preferred original images are those Shafts must go out, but it is just as important that at the thermographic temperatures of in that these original images are stable and their sharpness is usually not between about 200 and 350 ° C in which with the thermographic method melt. These pictures include those from Do not lose the temperature range. In the case of 5 compounds based on resin binders or soap binders, Usual transfer printing materials with wax binders Images made from one material are also suitable the image areas formed therefrom on the basis of a heat-fusible wax binder, the Melted absorption of infrared radiation. but wear a wax coating that does not have any infra-if they melt, they spread on the red radiation absorbing, heat generating Zu-original sheet and contaminate the carrier io rates, z. B. pigment, dye, filler or the like. Entbogen or the thermographic facility. Wich- holds. Absorbed in the thermographic process What is more important, however, is the fact that it is then the lower part or the one on the base generated heat pattern with the contour-sensitive layer of the image areas the radiation in the fused, bleeding original image areas follow the presence of a suitable pigment agrees, so that after transferring the 15 or dye and heating up. The one created in this way melted hectographic transfer printing layer on heat then leaves the insulating coating of the images Die arch there also blurred, unplaced and melted on all sides each receives uniform image areas. Spread the original image area on the surface, where-

The object of the invention is thus to create that each image area is completely screened off,

sharp original images for thermographic imaging so that the pigment-containing portion of each image area is

writing hectographic matrix sheet under cannot spread. In this way, the

Using a pressure or impact sharpness of the radiation absorbing part each

effect of image-generating transfer sheet, with image area preserved.

the image areas do not change their sharpness through the effects of the The following examples illustrate various

thermographic process generated heat - 25 types of carbon papers used to produce

atone, rather over a wide range of used in original image locations in accordance with the invention

thermographic methods for application can be grained,

methods are heat stable. The invention example 1
is characterized by the fact that a transmission

sheet is used, its transfer layer 30 The following ingredients have been thoroughly added

a material that absorbs infrared radiation or one that allows coatings to be applied

which does not melt below 200 ° C, so that the consistency is mixed, evenly on a paper

Original image areas obtained therefrom were spread out under the carrier, and the layer was let through

flow of the evaporation of the solvent generated by the absorbed radiation harden, wherein

Heat does not flow and does not spread. 35 one is pressure-sensitive, like a

Received transfer printing sheet that can be used as such a stencil for the thermographic process

are z. B. from the German patent the application according to the invention non-melt

916413 known transfer sheets, which allows one of the original images:

wear a high melting point coating. This prevents components by weight

but not an inaccurate reproduction of the original 40 ... ^,, ",,. , _c

as these are not themselves high-melting ethylcellulosebmder 5

and the Tembcüweinescümalz S

temperatures diverge. ° ^{lsic acid} ^

In the drawing shows. _T ^u ". 'YV'. 'Ä 1 ^

F i g. I an enlarged, schematic, transverse 45 nigrosm dye. ········· ■ JJ

Sectional view of an original sheet with an excess solvent (toluene or the like) 55

loan coal image A wax-based, nichtschmie- _R. .

renden image areas B and a printed image, example l

those with a stencil sheet and a hectographic The following ingredients have been made into one for

see transfer sheets are folded before the application of coatings of suitable consistency

Irradiation, stenz thoroughly mixed, evenly on one

F i g. 2 shows the arrangement of FIG. I applied to infrared polyethylene terephthalate, and one

irradiation, left the coating by evaporation of the solution

3 shows an enlarged, schematic transverse means to a pressure-sensitive, in the manner of a

Sectional view of a die sheet with the original 55 template effective transfer sheet harden the

image spots on his work surface, placed one on top of the other for the application of non-melting oil and

with a hectographic transfer sheet, in front of original images containing pigment according to the invention

Treatment with infrared radiation, suitable:

F i g. 4 shows the arrangement of FIG. 3 according to infrared _. ...,, _. ,. . .,

,. ?. ° ^ö _c components weight position

irradiation, 60

Fig. 5 is a perspective top view of a vinyl chloride-vinyl acetate

transfer printing unit according to the invention. mischpolymensat-Bmder IO

The original images of lard 17 produced according to the invention

can be of various types, with essentially only oleic acid 10

is that it absorbs the radiation it contains 65 carbon black 15

rend pigment under the influence of temperature solvents:

The temperature of the thermographic process is not ethyl acetate 36

let spread. Toluene 12

Example 3

The following ingredients were thoroughly mixed and evenly placed in a flexible backing Spread out in the form of a hot melt, after which it was allowed to cool:

Components parts by weight

Carnauba wax 60

Ceresin '4

Lanolin 10

Mineral oil 26

Then the following ingredients thoroughly became one for coating application mixed with a suitable consistency, applied evenly to the wax layer described above, heated to about 82 ° C to evaporate the solvent and to fuse the layers together then cooled, giving a wrap sheet working in the manner of a template, the under the action of an image-generating pressure, images with a clear wax coating result in:

Components parts by weight

Lanolin 10

Polybutylene resin 4

Butyl rubber 2

Mineral oil 6

Graphite 10

Naphtha 8

Toluene 60

Example 4

The following ingredients have been thoroughly made into one suitable for coating application Consistency mixed, evenly applied to a paper backing and used to evaporate the water heated to form a pressure transferable soap-like layer:

Components parts by weight

Ouicury wax 4

Micro wax 4

oleic acid 6

Potassium hydroxide

(10% aqueous solution) 8

Glycerine 1

Soot 25

Water 100

Transfer sheets obtained according to one of the preceding examples can be cut along one edge with any suitable original sheet using a weak adhesive or Easily detachable dividing line or the like. Are connected, so that the labeled original sheet is easily connected can be separated from the Umdrackbogen.

One of the advantages of the new method and the original heat-stable images used is in that the exposure time and temperature no longer play an important role. at Using original images on a common wax base, the time and temperature must be accurate be regulated so that the image areas develop enough heat to transfer the hectographic Material, but this heat does not lead to melting and smearing may be sufficient. The image areas used according to the invention can do a lot be heated to very high temperatures for a long time without melting and smearing. So can in the case of printed stencil sheets, the image areas according to the invention with excellent results Results can be applied to these die sheets, regardless of the type of used printing ink as long as it only absorbs radiation to a certain extent. The ab sorption properties the printing ink determine how much radiation has to be used and the original image locations applied according to the invention are heat stable enough to produce copies with excellent sharpness regardless of the application to deliver the coming amount of radiation up to temperatures of around 400 ° C.

The original sheet 10 can be a clear or at least translucent plastic film which preferably matted or with to improve its receptivity for the original image areas is provided with a coating.

According to another embodiment of the invention, the original image locations can directly either on the back or on the work surface of the die sheet (as shown in FIG. 3) will. With such an arrangement, the carbon paper sheet along one edge with a suitable, sufficiently translucent matrix arches are connected in the same way as this mentioned above in relation to an original sheet. Practical units of both types are shown in FIG. 5 shown in the drawing. When using matrix sheets made of Hanna tissue paper with sufficient The work surface is expediently very smooth and solid for the alcohol copying process glazed to improve their ability to accept the melted hectographic transfer material; when using matrix sheets made of plastic, one or both sides are expediently matted or coated as discussed above to render them ink receptive.

For inscribing a matrix sheet with hectographic dye according to the invention a unit made of carbon paper and original sheet or made of carbon paper and stencil sheets, depending on whether the original image areas to be applied are to be preserved or not.

F i g. 1 and 2 of the drawing explain the use of an inscribed original sheet which can be used repeatedly to achieve sharp and clear image areas corresponding to the original image areas B on a stencil sheet.

For comparison purposes, an image area A made of a usual wax-based material was also applied to the original sheet. A stencil sheet and a hectographic transfer sheet with a hectographic dye that does not absorb infrared radiation was then placed on the original sheet provided with image areas,

z. B. crystal violet containing transfer printing layer placed.

The sheets placed one on top of the other were exposed to infrared radiation directed onto the original image areas in a conventional thermal fax machine; the result obtained after removing the light source and separating the sheets is shown in FIG. The heat-resistant image areas B were not attacked by the heat, so that the corresponding

the dye image areas D were as sharp and clear as the originals. The image area A, which was made of conventional material, had meanwhile melted and had spread under the action of heat, as indicated by AA , and the corresponding colored image area C corresponded to the smeared, unclear image ^ L ·! much more than the original A.

Image areas D were copied sharply and clearly when the stencil sheet was used in a spirit copying process for inscribing hectographic copy sheets, while the spirit prints of image area C were wide and smeared compared to the original image area A, which they were supposed to correspond to.

Fig. 3 of the drawing illustrates an arrangement in which the original image locations A and B are located on the working surface of the stencil sheet. Excellent results have been obtained with this arrangement when the stencil sheet is highly transparent or translucent. Since the image areas generating the heat are in surface contact with the hectographic transfer printing layer, no heat is lost.

Infrared lamps directed at the stencil sheet generate radiation that passes through the stencil sheet and is absorbed by image areas A and B. The image area A melts and spreads on the stencil sheet, as shown by AA in Fig. 4, while the image areas B are not affected by the heat generated by the absorbed radiation.

Like F i g. 4 shows, the amount of hectographic transfer printing material of layer 14 that is picked up by the image areas and adheres to them corresponds more to the shape of the heated image areas than to the shape of the original image areas. In the case of the image areas B , the shape and sharpness were not influenced by the heat, so that the portions D transferred from the hectographic layer correspond in shape and sharpness to the original image areas. The original image area A made of a conventional wax-based material, on the other hand, was melted and had expanded in the form of the image area AA , and the transferred portion C of the hectographic layer corresponds to the shape of the melted, expanded image area AA much more than the shape of the original image area A.

In the production of the used to produce the original image areas according to the invention, So-called carbon papers, the dye used must absorb infrared radiation to a high degree and convert it into heat. Pigments such as carbon black, sewer black, Graphite, lamp black and iron oxide or dyes such as nigrosine and indulin and mixtures thereof.

There are no special conditions with regard to the hectographic transfer sheets that can be used to be observed, except that the dyes used must not noticeably absorb infrared radiation, as this should be self-evident for the person skilled in the art. The term "dyes" as used includes Dyes from the group of rhodamine, safranine and triarylmethane dyes, which are excellent Results give, as well as the colorless, color-forming ones, commonly in the field color bases used. Also useful non-melting plastic binders such. B. ethyl cellulose, used in place of wax.

Any source of radiation rich in infrared radiation, such as infrared lamps, carbon arc lamps, photographic Flash lamps and the like can be used. In most cases one uses expediently a suitable device, such as a thermal fax machine or a flat-form device.

The invention can be modified widely without departing from its scope will.

Claims (3)

Patent claims: 1. Process for labeling to be used in thermographic reproduction processes Original sheets by means of an image generating under pressure or impact Transfer sheet, characterized in that a transfer sheet is used whose transfer layer emits infrared radiation contains absorbent material which does not melt below 200 ° C, so that the original image areas obtained therefrom under the influence of the generated by the absorbed radiation Heat does not flow and does not spread. 2. The method according to claim 1, characterized in that the original image is on the surface a die sheet is applied. 3. The method according to claim 1, characterized in that a transfer sheet is used whose transfer layer contains a wax binder and is located above a Pressure or impact with the original image areas passing over to the original sheet covering, clear protective layer. Considered publications:
German patent specification No. 916 413. 1 sheet of drawings 509 758/27 12.65 © Bundesdruckerei Berlin