CN1138529A - Prodn. technique for a fluorescent anti-forge seal - Google Patents

Abstract

A fluorescent antiforge seal (especially copper seal) is made up through phototypesetting, photography,d eveloping, plate cophing, grinding copperplate, exposure, developing, high-temp heat treatment, retouching, initial and further corrosions, cutting and punching, and features high quality and strong anti-forge function. There are implicit antiforge fine lines on face of seal. Colourless fluorescent ink is used for organization code and recognized by ultraviolet recognizer.

Description

A kind of manufacture craft of fluorescence falsification preventing seal

The present invention relates to a kind of manufacture craft of fluorescence falsification preventing seal.

General chapter face of present seal and chapter body all are to do as a whole processing, like this, process seal of good quality, and cost of manufacture is just high; And resemble these class seals such as atom print and rubber seal, though the chapter face is processing separately, but require the chapter face can only be with the materials processing on soft ground on this class seal performance, cause this class chapter face have the pattern reproducibility poor, be subject to temperature, humidity effect and fragile, shortcoming such as service life is low.Aspect anti-counterfeiting performance, also the chapter face is not made the practice of false proof processing now.

The object of the present invention is to provide a kind of preparation method of chapter face copper and that done false proof processing.

To achieve these goals, the manufacturing process that the present invention adopts comprises phototypesetting, take pictures, develop, revise for the first time, printing down, the copperplate graining, painting photosensitive liquid, exposure, develop, post bake, high-temperature heat treatment, colour-separation drafting, mashed version, just rotten, degree of depth corrosion, revise for the third time, cut, punching press, operations such as finished product, promptly design the size of required seal earlier by laser photo-typesetting, pattern and false proof required complicated lines, literal etc., then this phototypesetting original text is taken pictures, through exposure, develop, draw the negative film that conforms to original paper after the photographic fixing, again film is placed on ground and on have on the copperplate of photoresists and expose, pattern on the cloudy sheet is reproduced on the copperplate version base truly, again the copperplate that stamps pattern is heat-treated, for mashed version is prepared, at this time, as find that pattern has the distortion part, must revise with enamel paint, with constant temperature copperplate is dried, again copperplate version base is done preservative treatment, then, copperplate immersed in the corrosive liquid corrode, draw clear pattern, after finishing copperplate is washed, through cutting, after the punch forming, make the chapter face.

Be described further below in conjunction with embodiment.

The size of phototypesetting design official seal, during literal, some irregular thin silk threads of design in literal, and one of design is hollow in literal, promptly has only superfine edge line, and the pattern of hollow, these are as false proof usefulness, this original copy through taking pictures, exposure, develop, after the photographic fixing, be made into the negative film, after this film printing down, be reproduced on the copperplate, copperplate is heat-treated, with 26 ℃ constant temperature drying, be applied to the patterned surfaces and the copperplate reverse side of reservation with enamel paint, the corrosive liquids of putting into concentration again and be 23 degree corrode, after 40 minutes, take out and corroded good copperplate washing through cutting, the punching press aftershaping.In the corrosive liquid of this concentration, the corrosion scope by wide to narrow, make pattern be the gradient of one 5 degree, font is true, and false proof microgroove is because lines are thinner, after corrosion, this microgroove face will be lower than the master pattern face naturally slightly, only can be dimly visible in the master pattern background when affixing one's seal, can not influence the clear of chapter face, the shape of this false proof silk thread can chosen in advance, and as the foundation of discerning the false from the genuine.Design has the unit code below official seal, and this is another anti-false sign, as long as load onto the colorless fluorescent stamp-pad ink in the fixed position of stamp-pad ink, is stained with the colorless fluorescent stamp-pad ink with the unit code, and just available ultraviolet identifier stamps at the chapter that covers out and finds it.

The present invention is specially adapted to make the security stamp of copper chapter face.

Claims (3)

1, a kind of manufacture craft of fluorescence falsification preventing seal is characterized in that it is that a kind of manufacture craft of copper chapter face comprises phototypesetting, takes pictures, development, printing down, copperplate graining, painting photosensitive liquid, exposure, development, post bake, high-temperature heat treatment, colour-separation drafting, mashed version, first rotten, operations such as degree of depth burn into is washed, cut, punching press, moulding.

2, security stamp manufacture craft according to claim 1 is characterized in that: the false proof complicated lines and the hollow pattern that will design during phototypesetting in master pattern embody with thin silk thread.

3, security stamp according to claim 1 is characterized in that: the concentration of corrosive liquid is 23～27, and etching time is 40 minutes, in this concentration in the time, to the corrosion of copper chapter face by wide to narrow, and make false proof microgroove line face be lower than the master pattern face slightly.