Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Method of use – kit – or combined with marking instrument or...
Patent
1994-09-12
1996-04-23
Hess, B. Hamilton
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Method of use, kit, or combined with marking instrument or...
427152, 503200, 503206, 503226, B41M 5128, B41M 5132
Patent
active
055103111
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION OF THE INVENTION
This invention relates to copy materials of the type generally referred to as "carbonless" which generally rely on two coatings formed respectively on the contiguous faces of superimposed sheets of material such as paper, namely a coating containing a colour-forming substance, usually contained in rupturable micro-capsules or similar, on the back of the uppermost sheet(usually known as a CB sheet) and a coating of a receptor layer on the front of the lowermost sheet (usually known as a CF sheet). Colour-forming chemicals are typically dissolved in an oily solvent and encapsulated by well known techniques, and when such capsules are ruptured by mechanical pressure, as by impact of a type bar of a typewriter, the chemicals are released and react to form a visible mark on the coating of the adjacent CF sheet.
Instead of confining the colour-forming chemicals in micro-capsules, they may be contained in oil droplets emulsified into a continuous phase coating which is rupturable to release the chemicals in response to locally applied pressure.
Conveniently, paper for use in such copying systems is of three types, distinguished by their coatings, namely CB sheets having a colour-former coating on the underside to form the top sheet of a multi-part set, receptor layer sheets having a CF coating on the upper side to form the bottom sheet of such a set, and optionally CFB sheets having a receptor layer coating on the upper side and a colour-former coating on the underside to form one or more intermediate sheets of a set where required. Such coatings are normally applied by a continuous process to cover the entire area of the appropriate face of the sheet.
In recent years, there has been a demand for printing onto such coated paper as the recipient material in toner-based printing systems or the like in which an image is transferred to the recipient material electrostatically, a process sometimes known as "electronic or laser printing", or by other non-imact methods.
However, where the material is, as is usually the case, cut into sheets prior to such printing it is essential for the sheet material to be fed into the printing apparatus with the correct face uppermost. It will be appreciated that normally a stack of sheets is placed into a sheet feeder mechanism associated with the printing apparatus and if the stack is placed in an inverted position relative to that required for printing on the appropriate face of each sheet, then the production from the entire stack of sheets will be lost. In practice the visual appearance of the opposite faces of each sheet, and correspondingly the exposed faces of the sheets at opposite ends of such a stack, may not be readily differentiated and accordingly this risk is quite substantial. Moreover, the error may not be detected until the wrongly printed material is incorporated into multi-part sets, giving rise to even greater loss.
Additionally, there is a requirement in some cases to identify the paper, for example by means of a brand name analogous to a water mark, or to display other information concerning the material, such as its weight and/or composition and/or its coatings etc, in such a manner that it can be identified not only by the immediate user but also by subsequent recipients.
EP0027698 discloses a sheet material carrying an unobtrusive image and a method for producing same in which an ink jet technique is used to form such a image on ordinary uncoated paper, or on the uncoated face of CB or CF paper or on The coated face of CB, CF or CFB paper, the image being formed after the coating has been deposited on the paper and thus on top of the coating.
However, the intensity of the image which can be formed on such coatings without seriously impeding the function of the coating is strictly limited to the formation of unobtrusive images as detailed in the aforesaid specification, and accordingly such images are of minimal value in either identifying the material or conveying other information as called for above, and certainly not of value
REFERENCES:
patent: 4097619 (1978-06-01), Davis et al.
patent: 4112138 (1978-09-01), Davis et al.
Atkinson Victor G.
Bond Michael P.
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