Pogoste težave in rešitve ofsetnega tiska kozmetičnih škatel

Pogoste težave in rešitve ofsetnega tiska kozmetičnih škatel

Načela tiskanja kozmetičnih škatel-Proces-Tehnologija: Kako določiti rob ust pri nalaganju plošče? Kako določiti širino čeljustnega roba tiskovne plošče pri nalaganju plošče? Kaj je sistem pozicioniranja tiska ... V nadaljevanju vas bomo seznanili s pogostimi težavami in rešitvami pri ofsetnem tisku embalaže. Naslednjo vsebino organizira Xiaobian za vašo referenco.

Pogoste težave in rešitve ofsetnega tiska kozmetičnih škatel

Kako pri namestitvi izdaje določiti rob ustja?

Katera stran originalne plošče se uporablja kot rob ustja, je treba upoštevati glede na potrebe tiskanja in post{0}}tiskarske obdelave.

①Considering the specification limitations and positioning accuracy of the printing machine, the long side of the original rectangular plate should be used as the mouth edge.

②From the perspective of overprinting accuracy, since the deformation of the paper on the gripping edge is small, and the deformation of the paper on the trailing edge is large, the side with high overprinting requirements on the original plate should be used as the gripping edge.

③From the point of view of saving paper, since the position of 1cm wide on the mouth edge cannot be printed, sometimes the paper format is very tight, and this part of the white edge needs to be fully utilized, then the blank edge on the finished product or the paper tongue edge of the gluing box should be placed. When in the mouth.

④From the point of view of post-press processing, the choice of gripper edge should be beneficial to die-cutting processing.

Kako pri namestitvi plošče določiti širino ustnega roba tiskovne plošče?

Pri nameščanju plošče mora biti razdalja med sliko originalne plošče in ustjem plošče v določenem območju. Recimo, da je razdalja med sliko na originalni plošči in ustjem tiskarske plošče c, razdalja med sliko na originalni plošči in ustjem papirja a in razdalja med ustjem papirja in ustjem tiskarske plošče je b, nato c=a plus b. Velikost b je določena s položajem cilindra plošče glede na odtisni cilinder in s tem, koliko sprednji merilnik prinaša zobe in papir. Vpliv nastavitve prednjega merilnika na b je zelo majhen. Količina nastavitve položaja valja plošče glede na odtisni cilinder je različna, običajno približno 5 cm.

The drying plate, that is, when c has been determined, adjust the size of b to change the front and rear position of the printed image on the paper, commonly known as "borrowing a cylinder". However, if the position of the image on the paper needs to be adjusted by "borrowing the cylinder" during printing, it will obviously affect the production efficiency. A more reasonable approach is to choose a roughly centered b{{0}} value for a certain type of printing press. If you want the image to be printed on the paper at a distance a from the edge of the mouth, determine the image when printing according to c=a plus b0. Distance c from the gripping edge of the plate. Every time the position of the original plate relative to the gripping edge of the printing plate is determined in this way, there is no need to "borrow the cylinder" during printing. If there are corner lines on the original plate, the distance between the original plate and the mouth of the printing plate is usually determined by using the corner line as a reference.

Kaj je sistem za pozicioniranje tiskanja?

Od izvirnika do tiskovine mora iti skozi barvno ločevanje, imponiranje in kopiranje. Shaiban, tiskanje in drugi proizvodni procesi. Da bi zagotovili, da se slike ločevanja barv lahko na najhitrejši način natančno pretiskajo pri izdelavi vsakega postopka, je mogoče uporabiti ujemanje pozicijskih zatičev in pozicijskih lukenj za doseganje namena z vrsto operacij. Ta sistem se imenuje sistem za pozicioniranje tiskanja. Ker se namizni sistem zdaj na splošno uporablja za izdelavo postavitve, ki lahko samodejno oddaja negative z natančno ločevanjem barv za pretisk, se sistem pozicioniranja uporablja predvsem v postopku tiskanja in tiskanja.

Iz česa je sestavljen sistem pozicioniranja?

Sistem pozicioniranja je v glavnem sestavljen iz tiskarskih plošč. Sestavljen je iz stroja za negativno prebijanje, pozicionirnega zatiča in pozicionirnega zatiča na cilindru plošče.

Kakšne so prednosti uporabe sistema za določanje položaja?

①It greatly shortens the time for version installation and version adjustment. If the printing plate can reasonably arrange the position of the original plate relative to the printing plate. And the correct use of the positioning system, then the printing machine can basically achieve the purpose of registration without changing the version between the various color groups, which greatly improves the production efficiency.

②The printing plate no longer needs to be pulled repeatedly, which reduces the overprinting inaccuracy caused by the stretching and deformation of the printing plate, and improves the printing quality of the product.

Kako pravilno uporabljati sistem pozicioniranja?

Trenutno je na Kitajskem sprejet večbarvni{0}}sistem za tiskanje in pozicioniranje. Pravilna metoda uporabe je naslednja:

①Cut the polyester film base, the width should be smaller than the distance between the image on the original plate and the mouth of the printing plate, and use a punching machine to punch the polyester film base.

②Use the punched edge of the polyester base as the benchmark for the gripping edge of the printing plate, and use the oblong hole in the middle of the polyester base as the centerline of the printing plate, and fix the negative of the first color version on the base. Note that the film base should be attached to the non-medicated film side of the negative film.

③ Put the polyester film base of the first color version of the fixed number on the positioning pins, and register the second color version negative film with the first color version negative film. At the same time, put the second polyester film base on the positioning pins, and fix the second color version of the negative film and the second polyester film base together under the condition that the second and first color version negatives are in register. Process the remaining negatives in the same way as the second-color negatives.

④ Punch holes for each printing plate to be printed, align the negatives of each color plate and the positioning holes of the printing plate with positioning pins, and then print the plate.

⑤When installing the plate, first make the plate clamps at the mouth of the plate cylinder of each unit retreat to the same reference position, and hang the two U-shaped holes on the printing plate on the positioning pins, so that the U-shaped holes and the positioning pins are closely connected. Then tighten the plate clip on the trailing edge first, and then tighten the plate clip on the mouth side.

Kakšne so zahteve za vir osvetlitve za različico PS?

①The spectrum of the light source of the printing machine should be consistent with the photosensitive spectrum of the PS version of the sensitizer. The photosensitive spectrum of the PS version is about 350-450nm, and the light source is required to have a high-energy peak in this wavelength band to shorten the exposure time and achieve a good exposure effect.

②The illuminance of the light source should be uniform. The illuminance meter can be used to detect the illuminance of each point in the middle and periphery of the printing table, and the illuminance unevenness of each point on the layout is required to be less than 15 percent .

③The power of the light source should be around 3000W, and the voltage fluctuation value should be less than 10 percent . Before exposure, the light source should be preheated to ensure stable light intensity during exposure.

Kako določiti čas osvetlitve različice PS?

Čas osvetlitve različice PS je v glavnem odvisen od fotoobčutljivega območja različice PS. Občutljivost in spektralne značilnosti svetlobnega vira, moč svetlobnega vira in drugi dejavniki. Zato morate vsakič, ko spremenite različico PS druge znamke ali spremenite vir svetlobe, uporabiti merilni in kontrolni trak za izvedbo serije testov na različici PS, da določite pravilen čas osvetlitve.

The test method is as follows: choose a transmission gray scale with a continuous density level difference of 0.15 and a Brunel or other similar test strips with small dots and thin lines in the positive image, and use the two test strips to gradually increase on the PS version. Expose the exposure time, record the corresponding exposure time of each piece, observe with a magnifying glass after development, check each test strip that is exposed, and the exposure time corresponding to the qualified test strip can be used as the normal printing time. When making ordinary mesh-adjusted products, the first 4 levels of the gray scale are required to be dried; 1 percent of the 6 dots are dried, and 2 percent of the dots are exposed; 11μm wide thin lines are retained, and 8μm wide thin lines are dried out. .

Kako prilagoditi čas osvetlitve različice PS glede na posebne pogoje?

①There are no dots, only thicker text. The original version of lines and solids can increase the exposure time, remove the small dirty spots and stains, and reduce the time for cleaning.

②If the negative is stored for too long, the blank part turns yellow, or after manual imposition, there are two or three layers of blank film bases superimposed together, which can slightly increase the exposure time; the original plate with insufficient density in the solid part can reduce the exposure time.

③The pressure of the proofing machine is lower than that of the printing machine, so the increase of the proofing dots is smaller than the increase of the printing dots, so the exposure time of the proofing plate should be less than the exposure time of the printing plate. For the proofing version, 0.5 percent of the outlets are generally removed, and 1 percent of the outlets are retained.

Strogo gledano, za barvno ločevalno ploščo za izdelavo večplastnih osnutkov. Pri določanju krivulje reprodukcije tona je treba upoštevati in kompenzirati razliko v povečanju pik v različnih situacijah. Dejansko standardizacija tega postopka na Kitajskem ni zelo dobra, zato bi morala temeljiti na proizvodnih pogojih zadevnih tiskarn. Prilagodite čas osvetlitve. Če je stopnja povečanja pik velika med postopkom tiskanja naše tovarne. Čas izpostavljenosti se lahko poveča. Odvisno od podlage za tiskanje mora biti pri tiskanju tiskovne plošče ofsetnega papirja čas osvetlitve daljši kot pri tiskanju tiskovne plošče s premazanim papirjem.

Zakaj morate pri tiskanju in izpostavljanju črpati zrak?

Če vzamemo za primer izdelavo PS plošče s pozitivnim vzorcem, pri tiskanju plošče, če površina filma negativnega filma ni v tesnem stiku s fotoobčutljivo prevleko PS plošče. Če je na sredini vrzel, bo svetloba poševno ustreljena z roba praznega dela negativa na fotoobčutljivo prevleko neposredno pod grafičnim delom, kar bo povzročilo razpad svetlobe na robu grafičnega dela. Naj bo slika zamegljena. Pike postanejo manjše, majhne pike in drobne črte se izgubijo.

Ker je ena stran okvirja za tiskanje prozorno steklo, druga stran pa je gumijasta blazinica. Ko vakuumska črpalka izvleče zrak iz tiskarskega okvirja, je zračni tlak v notranjosti nizek, gumijasta blazinica pa bo pod vplivom zunanjega atmosferskega tlaka pritisnila na ploščo PS. Originalni negativi so obrnjeni proti steklu in so tesno povezani.