Claims
- 1. A correction-imaging ribbon for use in pressure-imaging devices comprising (a) a first elongate strip of a flexible plastic film foundation having bonded to the front surface thereof a thin layer of a pressure-transferable imaging composition comprising synthetic resin binder material and coloring matter, and (b) a second elongate strip of a flexible plastic film foundation having bonded to the front surface thereof a latent adhesive layer which is substantially non-sticky to the touch but which becomes sticky under the effects of applied pressure, whereby an image formed on a copy sheet by typing aganist the back of said first elongate strip can be removed cleanly from said copy sheet by typing thereover against the back of said second elongate strip to cause the impressed area of said latent adhesive layer to stick to said image and pull it off the copy sheet, a marginal stripe of said latent adhesive layer of the second elongate strip being bonded directly to a marginal stripe of the rear surface of the plastic film foundation of the first elongate strip to provide a unitary correction-imaging ribbon.
- 2. A correction-imaging ribbon according to claim 1 in which the plastic film foundation of the second elongate strip is thicker than the plastic film foundation of the first elongate strip.
- 3. A correction-imaging ribbon according to claim 2 in which the foundation of the second elongate strip has a thickness of from about 1.0 to 5 mils and the foundation of the first elongate strip has a thickness of from about 0.25 mil to 1.5 mil, the foundation of the second strip being at least about 0.5 mil thicker than the foundation of the first strip.
- 4. A correction-imaging ribbon according to claim 1 in which the plastic film foundation of the first elongate strip comprises polyethylene.
- 5. A correction-imaging ribbon according to claim 1 in which the plastic film foundation of the second elongate strip comprises polyethylene terephthalate polyester.
- 6. A correction-imaging ribbon according to claim 1 in which said latent adhesive correction layer comprises a pressure-flowable adhesive resin and a non-adhesive surface material which renders the layer non-sticky to the touch in the absence of applied pressure.
- 7. A process for producing correction-imaging ribbons for use in pressure-imaging devices, comprising the steps of:
- a. producing a first elongate strip by applying a thin layer of pressure-transferable imaging composition comprising synthetic resin binder material and coloring matter to a flexible plastic film foundation;
- b. producing a second elongate strip by applying a latent adhesive correction layer to a flexible plastic film foundation, said layer being substantially non-adhesive to the touch but becoming sticky under the effects of applied presssure;
- c. superposing said first elongate strip over said second elongate strip so that a marginal stripe of the film foundation of the first strip overlaps a marginal stripe of the latent adhesive layer of the second strip; and
- d. applying pressure against said overlapped marginal stripes to render the marginal stripe of the latent adhesive layer of the second elongate strip sticky and cause it to bond to the marginal stripe of the film foundation of the first elongate strip to form a unitary correction-imaging ribbon.
- 8. A process according to claim 7 in which the film foundation of the second elongate strip is thicker than the film foundation of the first elongate strip.
- 9. A process according to claim 7 in which the latent adhesive correction layer comprises a pressure-flowable adhesive resin and a non-adhesive surface material which renders the layer non-sticky to the touch in the absence of applied pressure.
- 10. A process according to claim 7 in which both heat and pressure are applied in step (d) to cause said elongate strips to bond together along said marginal stripes.
Parent Case Info
This application is a continuation-in-part of prior application Ser. No. 526,127, filed Nov. 22, 1974 now U.S. Pat. No. 3,924,728, issued Dec. 9, 1975.
It is known to produce split correction-imaging ribbons based upon imaging compositions and correction compositions, both of which are pressure-transferable. The correction compositions function by overlying and masking the erroneous images and are effective in connection with imaging compositions of all types. A variety of techniques and a variety of materials have been used to produce such known ribbons. The most obvious method, namely the application of adjacent stripes of correction composition and imaging composition to a common foundation, has been found to be impractical because of the difficulty of printing thin adjacent stripes of different compositions onto a common support, which stripes require different coating techniques, thicknesses, drying conditions and/or solvents and must not become integrated with each other during application.
It has been proposed to avoid these problems by separately preparing the correction element and the imaging element, each with its own support, and thereafter uniting them to form a unitary element. According to one proposal, a fabric is impregnated with a liquid ink to provide the imaging strip but it has been found to be very difficult and expensive to unite such a fabric strip with a strip of masking composition. It has also been proposed to produce strips of masking composition and of imaging composition, each having its own plastic film foundation, and to adhere such strips to another plastic film foundation to form a common support. The main disadvantage of this proposal is that it results in the production of an element having such a thick composite foundation, comprising two plastic films and an intermediate layer of adhesive, that the imaging layer is not capable of producing typed images having the required degree of sharpness.
Copending application, Ser. No. 526,127, filed Nov. 22, 1974, relates to a novel image-correction system employing novel pressure-adhesive correction compositions and corresponding resin-base imaging compositions which are capable of being removed cleanly from a copy sheet by means of the correction composition under the effects of typing pressure. Said application also discloses a split correction-imaging ribbon comprising a common foundation coated with adjacent stripes of the correction and imaging compositions. As mentioned supra, it is extremely difficult to produce split ribbons in this manner, and it is the principal object of the present invention to provide a relatively simple and effective method for producing split adhesive correction-frangible imaging ribbons based upon compositions of the type disclosed in said copending application.
It is another object of this invention to provide novel split correction-imaging ribbons in which the imaging and correction strips are independently produced using foundations and coating thicknesses which permit the respective strips to carry out their function in the most effective manner.
It is yet another object of the present invention to unite individual longitudinal strips of supported imaging and correction composition without increasing the thickness of the support for either of the compositions in the area which is contacted by the printing element, such as a type bar.
US Referenced Citations (13)
Foreign Referenced Citations (1)
| Number |
Date |
Country |
| 1,261,134 |
Oct 1963 |
DT |
Non-Patent Literature Citations (1)
| Entry |
| IBM Technical Disclosure Bulletin, vol. 13, No. 11, Apr. 1971, p. 3460. |
Continuation in Parts (1)
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Number |
Date |
Country |
| Parent |
526127 |
Nov 1974 |
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Patent Grant
4034843
