DE1191835B - Thermographic duplication sheet - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

B 41m

German: ISk -7/05

Number: 1191 835

File number: C 28781 VIb / 15k

Filing date: December 27, 1962

Opening day: April 29, 1965

The invention relates to thermographic methods for inscribing copy or matrix sheets, z. B. hectographic matrix sheets, as well as the new duplication sheets and the means for their production.

In the hectographic reproduction field, the recently proposed use of infrared radiation for direct labeling of a hectographic matrix sheet from a labeled one Original bow received a lot of attention. In short, this method is use-based of a labeled original sheet, the image areas of which absorb infrared radiation and are converted into Can convert heat. In this way, a heat pattern of the image areas is generated and on transfer a hectographic template sheet and a hectographic duplication sheet, so that the hectographic mass is transferred softly and at the image points to the matrix sheet, whereby a matrix sheet corresponding to the original sheet is obtained for a spirit copying process.

In practice, many difficulties have arisen in making satisfactory stencil sheets from them thermographic methods. So it was almost impossible, the hectographic, image-generating mass in the form of more uniform, sharp and, for technical use, sufficiently dense and reproducible To transfer image areas to the matrix sheet.

It has now been found that these difficulties in the manner of those heretofore known and used hectographic duplication sheets. To with the thermographic process To function properly, the infrared hectographic duplicating sheet must be used be completely transparent so that it does not absorb large amounts of this radiation. So should the document or the backing of the duplicating sheet may consist of a thin, translucent paper. However, such a document does not give satisfactory results, mainly because because paper easily wrinkles or wrinkles below the image areas during the heat transfer process.

Plastic supports also have this disadvantage to a greater or lesser extent, depending on the properties of the material used Plastic, as plastic films tend to expand in heated areas. The effect is the opposite of the shrinkage problem that occurs with paper, but in the end it also occurs wrinkles and wrinkles.

The inclination of thin, translucent paper supports in the vicinity and below the Thermographic duplication sheet

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, N. Y. (V. St. A.)

Claimed priority:
V. St. v. America December 27, 1961
(162605)

Heated areas of the image become wrinkled and creased, is mainly due to water leaking from the Paper in the heated areas with subsequent shrinkage of these areas, losing the original Dimensions. The transfer mass, melted by the heat, also shines penetrate the carrier locally at the heated points, thereby increasing the dimensional stability of the wearer is different between these places and the places where nothing has penetrated. on In any case, the duplication sheets used appear wrinkled near and below the image areas or crumpled, and the image areas transferred therefrom onto the stencil sheet then have the folds corresponding gaps on the transfer sheet. The image areas obtained are also not dense and in the case of the labeling of hectographic matrix sheets do not contain enough of the hectographic ones Mass in order to be able to deliver many alcohol copies in the duplication process. These disadvantages may be due to the fact that the heated parts of the copy sheet that have become wrinkled partially come out of contact with the copy sheet or template sheet, so that one spotty and uneven transfer achieved; The penetration of the hot transmission mass is also to blame be at the image points in the carrier.

509 567/111

3 4

The object of the invention is the thermographic tissue paper or the like, and one for infrared radiation

Lettering of template or copy sheets with a permeable intermediate layer made of plastic, the

a transfer mass in the form of sharp and equal-no radiation-absorbing amounts of coloring

moderate image areas. Contains substances, fillers and the like. The preferred

The invention provides heat-sensitive duplicating layers are those based on

Folding sheets which, when heated, are exposed to certain layers of wax binders, oils and coloring substances

Places do not shrink or become wrinkled and underneath and do not contain any substances that produce infrared radiation

the action of heat a sharp and equal- it during the thermographic process

Allow moderate transmission. noticeably absorb.

The following description in connection with the io It is not clear why or how a combination drawing explains the invention in more detail. In the nation of a paper backing with a plastic drawing shows the intermediate layer when using paper

F i g. 1 is a diagonal cross-sectional view in enlarged or magnified plastic film carriers alone Avoids the scale of a multiplication of creasing and creasing according to the invention, application sheet, which is labeled with an original 15 These disadvantages occur even if a sheet and a matrix or copy sheet to plastic carrier is used, which put a plastic together and exposure to infrared interlayer, as both tend to be under is exposed to radiation, with the arc in the same way for better exposure to heat shown to be gripped at a distance from each other. Also owns the combination are, 20 made of paper carrier and plastic intermediate layer one

F i g. Fig. 2 is a perspective view of a previously better heat resistance and dimension used Duplication sheet with a silk stability than the paper or the plastic film alone, paper support 25 having a heat pattern 25a and wrinkled It seems that the tendency of the paper to shrink or has wrinkles 256 around the heat pattern and wrinkles from the inclination of the art, as well as a perspective view of a 25 layer of fabric, stretching, being balanced, so with the above reproduction sheet that the two give each other stability, written template or copy sheet 30 on which the heat transfer properties are also irregular and unevenly transferred combination is much better, what the sharpness that Image areas 31 are located with gaps 31a, as far as uniformity and completeness are concerned,

F i g. Figure 3 is a perspective view of substrate 30 as the heat transfer properties of paper

gers 20 of the duplication sheet according to the invention or the plastic film alone,

with a heat pattern 20 a and a perspective. Another, through the plastic intermediate layer

see illustration of a matrix or copy sheet 30 achieved advantage lies in their ability to the paper

with sharp and uniform care to make translucent according to the bearer. Papers

Finding transmitted image areas 32, 35 painterly as a result of the light reflecting contained therein,

F i g. 4 a perspective view of a hollow space or pores filled with air that is not penetrated

according to the invention, appearing from a reproduction sheet, become clear upon penetration

and a copy sheet unit, with plastic solution in these voids and pores

the sheets are translucent along one edge so that they can be separated from one another. Already translucent papers

are connected. This effect makes 4 ° even more translucent and

The invention creates a new duplicating even transparent. The effect achieved is greater

bow, which has the ability to produce a heat pattern so performance and sharpness in the case of heat multiplication

Intensive to guide that predetermined parts of the casting process.

Transfer layer soften and sharp and equal- The following example illustrates the invention without

However, they are moderately excessively limited in the thermographic process.

without the dimensions of a thin, translucent tissue paper being

Bearer of the reproduction sheet are disturbed. on one side with a solution in the form of a

The heat-sensitive displaced persons according to the invention clarify the plastic layer of the following

Diversity sheets consist of a paper carrier, coated composition:
on which a non-melting, non-transferable 5 °

Intermediate layer of plastic adheres, on which components are parts by weight

in turn a heat transferable, image-forming vinylidene chloride-vinyl chloride

Layer is located; the whole duplication sheet copolymer 20

does not contain any materials which, in the case of a short-term methyl ethyl ketone 80

early exposure to infrared radiation as much in-55

absorb infrared rays that form the image after evaporation of the volatile solvent

Layer is transferred. and curing of the vinyl layer will be hectic

The preferred reproductive transfer layer according to the invention of the following additions

bends are those that are particularly well applied in the composition of a hot melt: the in F i g. 1 with other 60

Arches can be folded. With these components parts by weight Arrangement must take the heat generated by the original image areas 11 absorbing infrared radiation. Carnauba wax 11

through the support 20 of the duplication sheet and ouricury wax 4

pass through the intermediate layer 21 before reaching 65 lanolin 7

the transmission layer 22 meets. Blown rapeseed oil 8

These preferred sheets have an infrared mineral oil 11

radiation-permeable paper carrier, e.g. B. thin crystal violet as dye 59

5 6

The above duplication sheet then becomes constituent parts by weight

with one of the previously used duplication carnauba wax 75

togen compared to that obtained by applying the pre-paraffin wax 25

directly on Milori blue (optional) ''.'.'.'.'.'.'.'.'.'.'.'. 1.3
the thin, translucent 5 described above

Tissue paper was obtained. Both sheets will be able to with hectographic duplication with the same translucent stencil papers instead of the dyes other hectographic, and materials to be used to create images with the same labeled originals. So can put together as shown in FIG. 1 shows, and about e.g. B. almost colorless, complementary, color-forming 3 seconds exposed with an infrared lamp. You practice 10 chemical compounds like gallic acid and iron such a pressure that the sheets in intimate salts, are used, the one compound Surface contact are kept. themselves in the transmission layer and the other themselves

The results are shown in FIG. 2 and 3 of the drawing in the spirit copy liquid or shown on top, where F i g. 2 is the carrier 25 of the duplicating surfaces of the copy sheet. Even almost folding sheet without plastic intermediate layer with 15 colorless intermediate dye products and coupling the wrinkled and wrinkled areas 25b around components for this can be shown in a similar way by the heat pattern 25a. The die obtained can be turned over.

bogen carries the transferred color mass in the form of instead of in the previous examples as

Image areas 31 with irregular or frayed plastic used sarans or polyvinyl butyrals

Outlines and gaps 31a. Any clear, thermoplastic material can be used

Figure 3 on the other hand. Shows the are according to the invention, the at temperatures below about 260 ⁰ C

composite carrier 20 of the duplicating does not melt. Examples are the vinyl resins,

sheet on which the heat pattern 20 a essentially - e.g. polyvinyl acetate, polyvinylidene chloride, vinyl

Lichen free of wrinkles or shrunken spots, chloride-vinyl acetate copolymers, acrylic acid and

appears, as well as the obtained matrix sheet 30, the 25 methacrylic acid and its esters and the like, plastics

the transferred color mass in the form of sharp and equal - based on cellulose, e.g. ethyl cellulose, celluloseac-

moderate image areas 32 carries. tat, cellulose nitrate, as well as various other artificial

Although the invention is primarily the field of fabrics, e.g. B. polyamides, polyethylene terephthalates, poly

the hectographic duplication concerns, carbonates u.

The transfer layers according to the invention are of course 30 It should also be emphasized that the sheets are not in the borrowed also for the production of single copies or for fig. 1 superimposed on the order shown Lettering of planographic printing plates or the like will be needed. So z. B. the reproduction-reproduction purposes can be used, with arcs at the bottom, with its transmission only The condition is that the overcoat used points upwards and on the die sheet bearing color mass is not applied to brief exposure 35 while the original sheet is on top so much infrared radiation is absorbed that the image is located. The separate original sheet can also be used generating layer is transferred. If some of them are left out, if the image areas 11 Copies are to be made, small amounts can therefore be placed on a surface of the sheet 30 to be written on of various dyes and colored pigments. In any case, both of the copy turns exist will. 40 sheets, the stencil paper or the planographic printing plate

When writing on lithographic printing plates, preferably from translucent paper with the

The transfer mass can even be free of the coloring required wet strength and the hydrophilic ones

Be substances, and it is only necessary that the super-properties are as appropriate for the intended end use

bearing mass is oleophilic, so they are required when in use, and is also the original bow

of the matrix obtained in planographic printing printing ink 45 is expediently translucent. However, should a non-

accepts. Since all common waxes are oleophilic, translucent original sheet or copy sheet

if the transfer layer can only be used from, the non-translucent one becomes

Wax or a mixture of wax with oil, sheet in the case of the in FIG. 1 stratification shown

optionally placed with the addition of a small amount of a support so that the radiation does not pass through it

coloring material, needs to go through for better visualization. The only condition is

stand. The following is a typical combination of the original sheet or the copy sheet

Settlement for a heat-sensitive, to plate short-term irradiation with infrared light not so much

duplicating sheets used for labeling may absorb radiation that the image-generating

give. Shift passes.

A thin, translucent paper is printed on a duplicating sheet according to the invention

Page with a solution of the following items can be made in the form of practical units

Settling, which after evaporation of the solution, by separating the duplication sheet

by means of a clear plastic layer: cash with a translucent copy sheet, matrix sheet or a planographic printing plate,

Components parts by weight _{6o as this} ρ i g. 4 shows. In this way, polyvinyl butyral 5, the sheets are in precise harmony with ethanol 85 when they are used, and the unit has a uniformity

Silica as a filler 6 radiation permeability without containing substances,

which with short-term irradiation so much infrared

After evaporation of the ethanol and curing 65 absorb radiation that the imaging layer

The vinyl layer is transferred from a hot melt one. Of course, the transmission

oleophilic transfer layer of the following properties and the irradiation time depending on the

composition applied: copy sheet used, d. H. depending on the degree

in which these are translucent, while the units according to the invention each have identical copy sheets so that the correct exposure times for optimal transfer are calculated can become and then remain constant. This is important because of underexposure or overexposure means a loss of material and time. Stitching the duplicating and Copy sheets can be made by means of a weak adhesive or by means of a weak dividing line 35, as shown in FIG. 4 of the drawing is shown.

As also FIG. 4 shows, the image-forming layer 22 can be applied to the paper support 20 in such a way that that you get on all four edges clean edge parts 23, which give the sheet a picture frame-like Give appearance. These marginal strips are free of the colored transfer compound, but can have the Have plastic intermediate layer, since the latter does not transfer under the action of heat or pressure will. The advantages of such a reproduction sheet produced by printing or the like lie in the fact that its edges do not contain any mass of paint that will be transferred and the conveyor belts and rollers of conventional copier machines operating with infrared radiation, ζ. B. the thermal fax machine, could contaminate. This problem is very easy in the case of hectographic transmission masses smear and are difficult to remove, especially important.

An infrared lamp rich in infrared radiation is expediently used as the infrared source; also used a conventional machine containing such a lamp, e.g. B. a thermal fax machine, which also has means for keeping the sheets in intimate surface contact during irradiation keep.

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

Claims (6)

Patent claims: 1. Duplication sheet for use in a thermographic printing process of a stencil sheet that produces many copies, with one labeled original sheet with the duplicating sheet and the stencil sheet is placed together so that the transfer layer of the duplication sheet in contact with the working surface of the stencil sheet is located, whereupon the folded sheet is briefly exposed to infrared radiation, with the heat absorbed from the image areas of the original sheet through the reproduction sheet the transfer layer of which melts and allows it to pass onto the stencil sheet and a duplicating sheet with a flexible support and a heat transferable imaging layer which does not absorb so much infrared radiation with short-term exposure is used Contains material that the image-forming layer is transferred, characterized in that that to prevent wrinkling during thermographic transfer between the The base is made of paper and the transfer layer of the duplication sheet is a plastic layer is arranged. 2. duplication sheet according to claim 1, characterized in that its carrier is made of translucent Paper is made and the plastic layer is also translucent. 3. duplication sheet according to claim 1 or 2, characterized in that the plastic layer consists of a vinyl resin. 4. duplication sheet according to claims 1, 2 or 3, characterized in that the transfer layer contains a hectographic imaging material. 5. duplication sheet according to claim 4, characterized in that the transfer layer contains an essentially colorless, color-forming hectographic material. 6. duplication sheet according to claims 1, 2 or 3, characterized in that the transfer layer contains an oleophilic substance for the production of planographic printing plates. 1 sheet of drawings 509 567/111 4.65 © Bundesdruckerei Berlin