Difficulties to watch out for when printing packaging

Difficulties to watch out for when printing packaging -

Only at the beginning of the printing work to do attentive design conception and distribution, can ensure that the packaging printing and post-press production and processing of the harmony and consistency. In manufacturing, should pay attention to the following.

1.Folding

Because of the digital technology promotional products on the printing ink color material is only adhered to the paper type surface layer, so the folding production process is very easy to produce folding cracks. Therefore, it is good to press the crease before folding production and processing.

2. Subfilm coating

To digital technology publicity products surface layer to carry out the production process of laminating the matte film, very packages printed on a large scale site and then carry out the production process of laminating the matte film, will be conducive to the post-press production process, very cutting or packaging when the publicity products have a very good maintenance effect.

To carry out single and double-sided publicity products matt film is not necessarily beneficial, because the side not covered with matt film in the event of production and processing will be subject to sliding friction effect is more prone to the situation of packaging printing color material off.

3. Horseback riding booking

Horseback binding is a great choice for most digital technology collateral and is ideal for binding thinner books such as brochures, booklets and pamphlets.

This binding method is cost-effective and can be carried out in conjunction with other production and processing methods, and the post-press production and processing of matching, folding, binding, and in-line cutting can be carried out together to ensure the rapid delivery required for digital printing.

4. Flat binding

In the design of the conception of flat-bound books, the first thing to pay attention to in the staple mouth and the body of the article in the middle of the binding of an adequate retreat, for example, o-helix wire binding line hole ratio of 3:1 (refers to each foot of 3 holes), should be at least empty 3/8 feet of blank pages; and when the ratio of line holes of 2:1, it should be at least empty 1/2 feet of blank pages. These blank pages are the spacing between the staple and the nearest line-hole edge.

In order to establish the specific address of the flat order production process, the designer will be able to grasp from the post-press processor the transformation of the specific printing paper after digital printing before the digital printing production process, which is essential for digital technology promotional materials.

Most of the electronic computer design conceptualization program process still does not take into account the packaging printing paper thickness after the slightest change, and digital printing, packaging printing in the paper type surface layer of the color material will cause the print number of thin and thick changes, when dozens of pages of digital printing prints to carry out the binding, the accumulation of thin and thick changes will make the electronic computer with the intention of calculating binding specifications are worthless. Therefore, to grasp the specific production of paper in digital printing after the sample transformation of the main parameters, to be able to accurately calculate the thickness of the booklet in advertising design, to ensure that the post-press production and processing to get the appropriate binding specifications.

5. Wireless network adhesive binding

The same as the screen printing of the wireless network adhesive binding production and processing, digital technology promotional products wireless network adhesive binding should also take into account the cutting volume of the binding. In addition to the back of the book to be empty 1/8 feet of milling back capacity, in the book with the other to be empty 1/8 feet of the cut amount.

In addition to this, a 1/4-foot dispensing area should be left empty on the lower edge of the book cover to avoid adhesive

Bleeding in the binding on the next good book. The wi-fi adhesive binding production process also stipulates that the package should be a little larger than the body of the article specification when printing the bleeding cover image.

6. Wi-Fi adhesive binding finishing

Whether or not you believe it or not, Wi-Fi glued binding finishing is this crucial post-press production process in the digital print binding method. The important thing about the finishing process is how the core is firmly bonded to the hard cover, producing books that can be stored for long periods of time.


 

Although the wireless network adhesive binding finishing cost and consumption of time and towards the short-run packaging printing sales market digital printing seems to be not quite the same, but some post-press binding companies are pre-fabricated components of digital printing finishing common different colors, different design styles and different specifications of the hardcover shell for digital printers to use, so the wireless network adhesive binding binding finishing has become a common binding method for digital printing. Commonly used in this binding method. First, the characteristics of printing ink.

1) Concentration value: concentration value of printing ink in packaging printing ink application is less, ink color is better; concentration value of small printing ink in packaging printing ink application is more, ink color taste light;

2) particle size: that is, the size of the printing ink particles, printing ink particle size is high, the printing ink concentration value is large, the publicity of the business network is clear, rounded and strong; printing ink particle size is low, the publicity of the business network is easy to hair, the printing plate of the print resistance rate is low;

3) viscosity, viscosity, easy to lead to uneven ink transfer, business network calendaring and its flower plate and other conditions; viscosity is small, easy to lead to printing ink emulsion and plate floating dirty conditions;

4) fluidity: fluidity degree, will make the layers of the text blurred, ink color is not round; fluidity degree is small, so that the spread of printing ink is not smooth, uneven, easy to lead to the same packaging printing surface has a deep after the light or light after the deep before the situation;

5) color fastness: color fastness of the printing ink, printed out the color of the goods colorful, text map business network round, firm, quite a sense of hierarchy, and can be stored for a long period of time; color fastness ability of the printing ink is poor, printed out the tone of the goods is very easy to fade, darkening;

6) abrasion resistance, alkali resistance, acid resistance: offset printing ink, to need to pay attention to its abrasion resistance, acid resistance, acid resistance, moisture resistance, acid resistance, alkali resistance, strong printing ink, packaging and printing out of the goods colorful, clear, clear business network clear; moisture resistance, acid resistance, alkali resistance, poor printing ink, packaging and printing out of the goods dull and lack of power, the layers of fuzzy, business network is not smooth.

Second, fountain water The PH plant of fountain water is usually in the middle of 3.8-4.6, in the specific production and manufacturing should be based on the details of the packaging and printing standards in various aspects of the adjustment, if the fountain water is too acidic and alkaline

Strong, part of the blank page of the section of the sand hole and the oleophilic basic graphic corrosion on the increase back, easy to lead to the situation of the flower plate, so that the printing plate of the reduction of the printing force; with the printing ink is easy to emulsion, ink rollers caused by the deinking of publicity products dark and no light. If the fountain water acidity and alkalinity is too weak, will make the printing plate blank page part of the hydrophilic oil-repellent properties weakened, the plate is easy to get dirty and due to the expansion of the business network of the publicity products and lead to paste the plate (UV ink packaging printing, if the fountain water acidity and alkalinity is acidic, the plate is easy to get dirty)

Third, the color sequence color sequence refers to the multi-color packaging printing, each color and various printing plate printing order, different color sequence will cause a variety of different packaging printing actual effect, scientific arrangement of the color sequence is very critical. But the color sequence is not absolute, the color sequence is usually assigned: pure color machine: yellow → magenta → green → black two-color machine: black → yellow, magenta → green (print landscape) or green → red (print role); with gold, silver, full plate site packaging printing, usually the first gold, silver, full plate site, to be printed after the ink is dry and then set the four-color ink.

(1) Check whether the 4-color film specifications are the same (four film is not a complete set of equipment);

2) For the remaining sheets, check whether the text is detailed;

(3) stabilize water, ink, more than ink strokes Ping Geng, to ensure that the same batch of publicity products with the same color of ink;

4) As far as possible to ensure that as little as possible to shut down or shut down after cleaning the rubber blanket (already need to put some over the plate paper)

Fourth, when announcing package printing When announcing package printing, the operator should concentrate on ensuring:

(1) Look: look at the opening and closing conditions, look at the sample ink color, registration and business network quality;

(2) Listen: listen to the sound of the equipment there are no abnormalities, listen to the equipment vibration dexterity area there is no noise;

(3) Touch: Touch the equipment to facilitate the damage due to the temperature of the components, is not a significant temperature shift;

(4) smell: smell wood has household appliances burnt and its abnormal odor. (UV ink package printing to pay more attention to the UV machine switching power line);

(5) Inspection: check the condition of the printed materials and equipment, there is no anomaly, found that the problem, immediately remove.

Fifth, how to identify the size of the water to identify the size of the water, the first need to look at the section water. This point, depending on the operator's work experience. Usually, the water is big, the plate refracts light strongly, and the side view is brighter;

On the contrary, the plate refracts a weak amount of light and is darker in side view; if the water is too large, it can also be observed from the following:

(1) Shovel ink on the ink roller with a paper card, leaving tiny droplets of water on the top of the card;

(2) Water droplets on the water rollers, ink rollers in the deinking condition must be water droplets;

(3) The water has not dried up after turning off the water or turning off the machine for a longer period of time;

(4) The impression is bitter at the business site, and the ink color is dull;

(5) Water shadow or droplets on the end tip of the eraser roller drum.

Six, manipulate the water flow balance Printing ink and water are not absolutely incompatible. In the specific packaging printing process, printing ink and water through the rubber stick and rubber stick extrusion molding, it will be combined together, so that the printing ink emulsion.

Printing ink emulsion situation there are two kinds: when the water is big ink bell, produce "package water oil"; When the water is small ink is bigger, produce "oil package water". In the whole process of screen printing, the ink strokes to grasp the level of balance and all the normal migration of the print marks, ink color intensity, color accuracy, publicity of the dry and sticky dirty and so on has a very close correlation. Usually, the water is large, so that the printing ink emulsion, ink color shallow; water is small, part of the blank page of the section will adhere to the printing ink, resulting in dirty marks. Thus, screen printing manipulation of good ink strokes equalization is important for packaging printing.

Seven, manipulate the ink strokes balanced manipulate the ink strokes balanced, usually to grasp the water less ink thick standard. Less water, refers to a part of the blank page in order to section does not stick dirty as a prerequisite; ink thick, refers to the creation of a small amount of water basically moderate enhancement of the amount of ink.

In the whole process of package printing, the most avoided point is the water is big ink. In consideration of the water flow, should be depending on the total area size and all over the plate map condition, print marks ink layer thickness, printing paper characteristics, printing ink characteristics, equipment operating rate, production workshop temperature and humidity, fountain solution ph value and its printing ink often added to the neutralizing agent and other conditions.

Eight, clean up the rubber blanket, color change when the ink roller must be washed neat After a period of time after the package printing, the rubber blanket will be piled up on the paper hair, paper powder, ink and it dirty, reducing the quality of publicity products, so the rubber blanket to clean up immediately, very low compressive strength of the printing process when the type of paper, paper hair, paper powder is more serious deposition, and therefore more often to clean up. Color change if the ink roller group did not clean up neatly, it will jeopardize the purity of the new ink color, from dark brown ink for light gray ink, especially in the to pay attention to.

If the black ink is changed to yellow ink, if the black ink is not washed neatly, the yellow ink will be black, which will jeopardize the quality of the publicity.