CN1648769A - Gravure printing method and gravure printing article - Google Patents

Abstract

The photogravure printing is completed with photogravure comprising AM screen and FM screen. The text and reproduced image needing dense ink are formed with the meshes of corresponding AM screen, while the picture and fine lines with dark and light ink for representing are formed with the meshes of corresponding FM screen.

Description

Woodburytype and intaglio printing product

Technical field

The present invention relates to such gravure process and intaglio printing product, this gravure process is to adopt a plurality of print roller to carry out in the gravure process of polychrome double exposure, by adopt improvement used in AM (amplitude modulation) net and the intaglio printing FM (frequency modulation) net, going for having need denseer oil be the printing of concentration and the printing that needs the printing of high meticulous gradation.

Background technology

Fig. 3 shows the AM net of bright common photogravure.In photogravure, with site size performance gradation, owing to need strike off printing ink unnecessary when allowing printing ink enter in the mesh with scraper, reach 20～30% at the area of the netting twine of dark dash area, in other words, this photogravure be as with respect to the gradation 0～100% of printed matter with the gradation of version version with about 0～75% performance.

Main photogravure has by the mesh forming method of engraving method with by coating light-sensitive surface, exposure, development, etched mesh forming method (below be called etching method), the mesh forming method of engraving method is because mesh forms rectangular pyramid, and the ink transfer in the hi-lite is good.In etching method, be formed in the recess of shallow disc shape owing to mesh, at the very little hi-lite of mesh, completely to fill in the transfer ratio engraving method that makes printing ink within mesh poor because of printing ink, but then, printing ink is inadequate when flowing on the cross part of netting twine in the darkest dash area, so printing ink just can shift reliably on this cross part, and have the profile that can make literal to have the advantage of clear profile, in addition owing to mesh in the darkest shadow part is also shallow, so be applicable to employing water color ink Jimo printing stock.

Fig. 5 shows the AM net of gelatin forme or flexible printing version.Though the AM net of offset plate etc. is also with site size performance gradation because the different netting twines that do not need with photogravure, so edition gradation 0～100% can be roughly the gradation 0～100% of corresponding printed matter correctly.

In recent years, in the field of offset printing or flexible printing, replacing AM net mode in the past shown in Figure 5, is that the center has begun the FM net mode of practical application with the number performance gradation of small site with America and Europe.Use the resolution of scooping up little tracing point owing to can obtain expression this area of fine structure in the FM network technology, even in the output of the printer of the output device of low resolution or request formula printing machine, also can seek for raising picture quality, but in photogravure, do not have netting twine, do not carry out the trial of applicability fully owing to striking off the unnecessary printing ink that enters in the mesh with scraper plate.

With respect to the suitable FM net mode of offset printing or flexible printing field, industry association is printed by Japan take passages as follows below in the advantage of announcing on the Internet.

(1) the FM net as shown in Figure 6, dot shape is not done the arrangement of rule, thereby can avoid becoming the generation of the ripple of obstacle.In the AM net,, in the FM net, can not produce the output ripple owing to the Discrete Distribution of site though set half tone rule angle so that ripple is minimum for each version.In addition, the FM net can not produce the paterage pattern.In the AM net, the pattern of tortoise plastron sample can occur from high brightness to medium tone, but the FM net then such pattern can not appear.Even if carry out the printing of 5 looks above, also the phenomenon that breaks can not occur.

(2) FM net is for all gradations from the high brightness to the shade, owing to the site size reduces as much as possible, so can there be high-resolution printing to reproduce.The FM net is scattered in does not have close smallest point mutually near about 30% concentration.

(3) the FM net does not have significant density fluctuation.The gray scale fluctuation (concentration gradient) that the place, site of AM online about 50% takes place is not remarkable in the FM net.This is because near the site of FM net middle is at random with the contact of consecutive point, due to the gradient of concentration is little.

(4) the performance distinctness of tone in the FM net.The process colour that adds color, color that colourity is high near primary colors can be brought into play more real effect with four color reproductions.

(5) the FM net can have resolution than AM net height for identical output data capacity.Owing to can dwindle mutual interval, site,, resolution than AM net height just can be arranged by dwindling a footpath if the capacity of output data is identical.The FM net is because minimum tracing point becomes physically resolution, so can expect to satisfy the demand to net the view data lacked (net 32～51%) than FM.Therefore, if can realize the suitable quality of net 175 lines, then can wish to shorten the processing time of making sheet, output step and can improve productive rate with the FM net in a little bigger footpath.

(6) in the FM net, minimum tracing point becomes the resolution of physics, tries to achieve the resolution than AM net height easily.Aspect gradation, the AM net has increased screen density in order to realize high-fineness causes gradation to reduce, then can be not like this in the FM net.

(7) the FM printed matter is compared with the AM printed matter, and the tone of being transferred to shadow part from Neutral colour raises, basic identical to low output with AM then from high light to medium tone portion.The K value of the contrast of expression shadow side, FM is all sidedly little, the concentration of ink gun similarly is difficult to obtain high concentration with the AM net that uses high screen density in mesh portions in the FM net that the high-fineness that uses the point footpath is used.

Existing photoengraving roller all is that the mesh by AM net forms, does not exist the mesh netted by FM to form.In engraving method,, be potential with the photoetching rule though engraving FM net is impossible.

In addition, in gravure roll in the past, do not exist with respect to the mesh of a roller formation AM net and the mesh of FM net yet.

In the application's instructions, the mesh of AM net refers to: is formed arrangement pitch that laser mask-making technology that operation such as sub-image-developments-etching forms makes by coating light-sensitive surface-laser explosure certain and net the mesh of limitting size variation, and the arrangement pitch of making by the adamas cutting stylus of electronic engraving machine necessarily and the mesh of width of mesh and change in depth the two.

So far, in the gravure making sheet that needs distinct text profile and in dash area, need in the gravure making sheet of full concentration, most coating light-sensitive surface-laser explosures that utilize form the laser mask-making technology that sub-image-operations such as development-etching are formed, for photo portion the situation of many images is arranged, then more utilize to find time to cause because of printing ink shift the few electronic engraving machine of bad phenomenon and carry out the making sheet of gravure.

In addition, in the making sheet of carrying out polychrome gravure, also can effectively utilize the feature of various making sheet, use screen net gravure, then use electronic engraving machine for the version that photo portion is arranged for literal/fine rule version.

But then do not have the image that produces ripple if carefully do not make up cut with screen net photogravure, so just its use has been produced restriction.In addition, when utilizing two kinds of plate-making modes with respect to a printing cylinder, but though for example also comparison film part make a plate with electronic engraving machine, literal/fine rule is partly used the making sheet of screen net photogravure mode, but, just can strengthen cost in actual applications because plate making machinery relates to many aspects and will increase operation.

Summary of the invention

The present invention just is being based on above-mentioned variety of problems and is proposing, purpose is the photogravure roller and the photogravure product that provide such, thus can the FM net that is suitable among the hectographic printing etc. be used for photogravure so that with the combination of AM net, eliminate their shortcoming by comprehensive the two advantage, have the situation that the photogravure roller of the mesh of AM net prints with in the past usefulness and compare, can carry out high meticulous photogravure.

The photogravure roller that another object of the present invention is to provide such and the printed matter of photogravure, can avoid the problem of the concentration deficiency that produces when net by setting the AM net with FM, and by set the FM net then can avoid because set that the AM net causes that the ink transfer of hi-lite is bad, the fine rule that tilts and curved profile is unintelligible, the problem of generation ripple.

Photogravure method that a further object of the present invention is to provide such and intaglio printing, whereby can be in the photogravure method of double exposure polychrome, by using the FM net that has improved in AM net and the photogravure, can be applicable to that the printing that needs dense printing ink concentration needs the presswork of the printing of high meticulous gradation simultaneously.

First aspect of the present invention is that the gravure process that makes a plurality of print roller of application carry out the polychrome double exposure possesses following characteristics: wherein the mesh of correspondences such as the literal of the printing ink concentration that at least one roller is dense with respect to needs and reproduced image is to form with the AM net; And for the photograph image that shows with gradation and the mesh of fine rule, then use from the high brightness to the shadow part then is to form with the FM net, or be the FM net from high brightness portion to medium tone portion and mix AM net with grid (rectangular opening, square hole etc.) shape gradually from medium tone portion, then be entirely the print roller of AM net in the zone of shadow part.

Another aspect of the present invention provides such gravure process, and it is to make to use a plurality of print roller and carry out the gravure process of polychrome double exposure and possess following characteristics: for the print roller that need print with dense printing ink concentration, mesh is formed by the AM net; And the print roller of printing for photograph image and fine rule with gradation performance, then use the mesh that forms the FM net from high brightness portion to shadow part, or form the mesh of FM net from high brightness portion to medium tone portion and mix gradually with cancellate AM net from medium tone portion, then be entirely the print roller of AM net in the zone of shadow part.

The feature of the described invention of claim 3 then is to provide the photogravure product by claim 1 or 2 described photogravure method printings.

The present invention has following effect.

Invention according to described one aspect of the present invention, carry out in the photogravure method of polychrome double exposure in a plurality of print roller of application, such photogravure roller and photogravure product are provided, wherein with respect at least one roller, for pairing meshes such as literal that needs dense printing ink concentration and reproduced images is to form with the AM net, can guarantee dense printing ink concentration thus; For then forming, even if be that the printing that can avoid the generation of ripple to carry out more than 5 looks can not break yet, can make high-resolution printing reproduction and not have significant density fluctuation than the superior part of AM net as the FM net with the FM net with the photograph image of gradation performance mesh with fine rule.

According to described invention on the other hand, carry out in the photogravure method of polychrome double exposure with a plurality of print roller at seal, such photogravure roller and photogravure product are provided, for the printing of black with white, the structure of mesh of carrying out the photogravure roller of this printing forms and can obtain dense printing ink concentration; And for printings such as blue, red, Huangs, the mesh that carries out the photogravure roller of this printing then constitutes, even can carry out the printing of the meticulous gradation of height and carry out the printing that double exposure also can realize being difficult for producing ripple, this compares with the situation that in the past the photogravure roller with mesh with AM net prints, and can realize high meticulous photogravure.In addition, then can avoid for getting the problem of deciding the concentration deficiency that FM when net produce by setting the AM net, and the ink transfer of the high brightness portion that takes place when netting as AM is bad, inclination fine rule and problems such as curved profile is unclear, ripple generation, then can avoid, and can obtain the advantage of aforesaid FM net by setting the FM net.

Description of drawings

Fig. 1 is the skeleton view that shows the photogravure roller of the described inventive embodiments of bright claim 1.

Fig. 2 illustrates the embodiment of claim 2, the photogravure method when using black, blue, red, the yellow and white multicolored photogravure of five print roller double exposures.

Fig. 3 shows bright used in the past used with the present invention, the common AM net of photogravure.

Fig. 4 shows the gradation of the FM net that bright the present invention is used.

Fig. 5 shows used common AM net among bright hectographic printing in the past etc.

Fig. 6 shows used common FM net among bright hectographic printing in the past etc.

The meaning of each label is as follows among the figure:

R, the photogravure roller; 1, literal; 2, reproduced image; 3, photograph image; 4, fine rule; R ₁～R ₅, the photogravure roller; 5,6,7,8,9, the image of version.

Concrete form of implementation

The present invention carries out having in the method for polychrome double exposure using a plurality of print roller: including AM net and FM net on one of them roller at least, then be formed with AM net and the FM form of implementation one of in netting on all the other these a plurality of rollers; The AM net does not mix existence with the FM net on any one roller, is formed with the form of implementation that AM roller of netting and the roller that is formed with the FM net then mix existence.

In last form of implementation, pairing meshes such as the literal of the printing ink concentration that one of them roller is dense with respect to needs and reproduced image are to form with the AM net at least; For then using such print roller with the photograph image of gradation performance and the mesh of fine rule, it forms the mesh of FM net from high brightness portion to shadow part, or form the mesh of FM net from high brightness portion to medium tone portion and mix gradually with the poroid AM net of rectangle from the zone of medium tone portion, then use the AM net fully in the zone of shadow part.

In one form of implementation of back, its mesh of print roller that prints with dense printing ink concentration for need is to be formed by the AM net; And for the print roller of carrying out with the printing of the photograph image of gradation performance and fine rule, then form the mesh of FM net from high brightness portion to shadow part, or form the mesh of FM from high brightness portion to medium tone portion and mix gradually with the poroid AM net of rectangle from medium tone portion, then use the AM net fully in the zone of shadow part.

(embodiment 1)

As shown in Figure 1, with respect to 1 roller R,, form with AM net shown in Figure 3 for the mesh of need with correspondences such as dense printing ink concentration formation literal 1 and reproduced images 2; For with the photograph image 3 of gradation performance and the mesh of fine rule 4, then form with the net of the FM shown in the C1 among Fig. 4.

(embodiment 2)

As shown in Figure 2, in the photogravure method during photogravure of for example black, blue, red, yellow and white 5 looks with 5 print roller double exposures, in first print zone photogravure roller R1 process black is installed, in second print zone photogravure roller R2 printing blueness is installed, in the 3rd print zone photogravure roller R3 printing redness is installed, in the 4th print zone photogravure roller R4 process yellow is installed, photogravure roller R5 printing white is installed in the 5th print zone.

In the printing of black and white, the domain that forms the photogravure roller carry out this printing as 5 or 9 eyed structure owing to be to form, so can obtain dense printing ink concentration with AM net shown in Figure 3.

Blue, red and yellow printing, the domain of photogravure roller that this printing is carried out in formation as 6 or 7 or 8 eyed structure owing to be to form with FM net shown in Figure 4, even if event is carried out the printing of the meticulous gradation of height and is double exposure, also can realize being difficult for producing the printing of ripple.

Thereby the black that literal that carries out with dense printing ink concentration for need and seal are write image etc. is with the printing of white or be provided with and do not give the situation of showing bright special color among the figure, and the roller that can adopt the mesh with the AM net to constitute prints.For with the photograph image of gradation performance and fine rule when printing with the color on white with black, then be that the roller with the mesh formation of FM net prints.

AM net shown in Figure 3 can be formed by the mesh forming method or the coating light-sensitive surface-exposure-development-etched mesh forming method of electronic engraving machine.

Among Fig. 4, A1 is preparing 0%～100% gradation, it is covered program by the FM screen carry out the numerical information that the FM screen covers the FM net of trying to achieve, the result who represents as the version information before the formation version.B1 is a version information representation that forms before the version, covers corresponding to the zone of shadow part or near the shown AM result of information of netting twine of the darkest shadow part of the AM net of trying to achieve corresponding to the zone of shadow part the shadow part of medium tone portion by the AM screen.The equitant digital version information of numerical information of the C1 netting twine that then to be expression net the numerical information of the FM shown in A1 net and the AM shown in the B1.

So, version C1 is with respect to forming version version information before, mesh is become minimumly can well carry out the required size of ink transfer, covering with the FM screen to the zone of shadow part from highlights and playing on the zone of shadow part near forming the shadow part of medium tone portion of FM net information A 1 (illustrating) as optical information, the netting twine information B1 (illustrating) of the darkest shadow part of overlapping AM net with photogravure and forming as optical information, like this, rough or pit can not take place for the FM net in zone from highlights to medium tone portion purely, and mesh is constrained to and minimumly can well carries out the required size of printing ink transfer printing, from medium tone portion, the poroid AM net of rectangle is formed in the substrate of FM net gradually, becomes the photogravure plate that the shadow part zone becomes the AM net fully.

FM net shown in the plate C1 of Fig. 4 can form the method for mesh or the method formation that the laser engraving method forms mesh by coating light-sensitive surface-laser explosure-development-etching.

The FM net is owing to be not to make with electronic engraving machine, and the version that is mixed with AM net and FM net preferably by being coated with that light-sensitive surface-laser explosure-development-etched mesh forming method forms or being formed by the forming method of the mesh of laser engraving method, can not increase the number in man-hour like this.

This photogravure plate, the point that in shadow part, has the poroid AM net of rectangle required in the photogravure and in this rectangular opening, then have FM to net, this can obtain sufficient optical density for the printed matter of laying particular stress on optical density, and in the zone from shadow part to medium tone portion, the poroid AM net of rectangle disappears gradually and transfers to the point that FM nets, from medium tone portion to highlights, because the netting twine of dark shadow part is overlapping and be the FM net purely in the AM of the photogravure net, and, just can obtain the advantage that FM nets because net limit is constrained to and minimumly can well carries out the required size of printing ink transfer printing and transfer of ink well.In addition, shown in Figure 6 0%～100% gradation zone with respect to the FM net, can replace the FM net shown in the version C1 among Fig. 4 with cutting about 75%～100% the FM net of drawing.

As for plate-making method, digiboard information can be carried out the color of Y, M, C three looks decomposes, and then zone that will be from high brightness portion to shadow part is carried out the FM screen and is covered edition information of trying to achieve by mesh being constrained to the minimum improved program that can well carry out the required size of ink transfer, simultaneously covering program by improved AM screen carries out the AM screen and covers, from trying to achieve the version information that the netting twine of the darkest shadow part of the AM net of photogravure is represented to shadow part near the shadow part of medium tone portion, with these two kinds of version information overlaps, carry out making sheet based on this edition information.

Claims (3)

1. gravure process, it is characterized in that, it is to make to use the gravure process that a plurality of print roller are carried out the polychrome double exposure, wherein, it is to form with the AM net that use has the mesh of correspondences such as the literal of the roller printing ink concentration dense with respect to needs and reproduced image at least, and for the photograph image that shows with gradation and the mesh of fine rule, then be to be to form from the high brightness to the shadow part with the FM net, or be the FM net from high brightness portion to medium tone portion and mix gradually with cancellate AM net from medium tone portion, then be entirely the print roller of AM net in the zone of shadow part.

2. gravure process, it is characterized in that, it is to make to use the gravure process that a plurality of print roller are carried out the polychrome double exposure, wherein, for the print roller that need print with dense printing ink concentration, mesh is formed by the AM net, and the print roller of printing for photograph image and fine rule with gradation performance, it then is the mesh that forms the FM net from high brightness portion to shadow part, or form the mesh of FM net from high brightness portion to medium tone portion and mix gradually with cancellate AM net from medium tone portion, then be entirely the print roller of AM net in the zone of shadow part.

3. according to the photogravure product, it is characterized in that it is to be printed as by claim 1 or 2 described photogravure methods.

Images