The first thing to ensure for sticker printing is quality. Only high-quality sticker printing can make our sticker products more popular. We need to know how to print to improve the quality. Generally speaking, self-adhesive printing needs to be considered from the aspects of self-adhesive materials, ink application, printing equipment selection, production process and so on. Today, the author brings you a more professional introduction, 5 ways to improve the quality of sticker printing!
1. Selection of raw materials
When selecting raw materials, be sure to use high-quality self-adhesive materials that meet all physical and chemical indicators, instead of using expired or unstable physical and chemical indicators. Although the price of the latter is low, due to the unstable quality of such materials, the consumption of each process is large, and even the equipment cannot be processed normally. While wasting raw materials, a lot of manpower and material resources are also wasted. As a result, the processing cost of the finished label It is not necessarily low, and more seriously, it may be returned by customers, or even lose customers.
The choice of raw materials should be considered from the following two aspects.
1. Printing and processing characteristics of self-adhesive materials
â‘ Consistency of surface gloss and color of surface material, uniformity of density
These indicators determine the uniformity of the ink absorption of the self-adhesive materials, and also determine the color difference of the same batch of label prints. The coating strength of the face material determines whether a large amount of paper dust will be generated during printing, and it is also an important indicator to determine the printing quality.
â‘¡The uniformity and strength indication of the thickness of the backing paper and face material
These indexes are not only related to printing performance, but also important indexes that determine the uniformity of die cutting and the speed and edge breakage when discharging. If these indicators are too low, the label machine cannot be produced at high speed.
â‘¢The flatness of the material or the uniformity of the rewinding tension
Whether it is single-sheet printing or web printing, the flatness of the material determines whether the paper can be correctly fed, run, registered, and received during printing. For the roll material, the rewinding tension will play an important role in the flatness of the end surface of the roll material, whether there is glue leakage, and whether it can be correctly registered.
â‘£ Uniformity and correct coating amount of adhesive and silicone oil coating
These indicators directly affect the peeling force (release force) between the label and the backing paper, and the size of the peeling force directly affects the die-cutting waste discharge and the speed of the machine. The peeling force also determines the label's output status, that is, the application status . In addition, the amount of glue applied will also affect the material's end-face penetration. Therefore, when purchasing adhesive materials, we must carefully check and choose the materials with the appropriate amount of glue and silicon.
2. Application characteristics of self-adhesive materials
â‘ Type of adhesive
When choosing a self-adhesive material, first determine whether the adhesive required for the self-adhesive label you make is permanent or removable, whether it is applied once or re-attached, and the product is a dry label Are there any special requirements for the chemical properties of the adhesive?
â‘¡The surface condition of the labeled object
What kind of material is the surface of the labeling object, whether it is wood, glass or plastic, and whether the surface is smooth or rough, such indicators determine what kind of adhesive should be selected.
â‘¢The shape and intensity of the labeled object
Whether the labeling object is flat or curved, large or small diameter, single curved or spherical; whether the object is rigid or compressible. These indicators are directly related to the choice of face material and adhesive.
â‘£The use environment of the sticker
Whether the use environment of the labeled items is outdoor or indoor, high temperature environment or low temperature environment, whether the use environment is corrosive, dry or humid. According to these indicators, you can choose the matching face material and adhesive.
⑤ How to use stickers
Whether it is manual labeling or automatic labeling. The labeling method of the label can determine the type of label material, the type of ink, and the printing method.
Second, the correct choice of ink
The choice of ink is mainly considered from the aspects of the ink's own quality, hue, and ink wetting to the substrate—that is, the adhesion of the ink. Although there are many types of self-adhesive materials, the surface materials can be basically divided into three types: paper, aluminum foil and film. At present, in China, the printing of self-adhesive labels is mainly based on relief printing (reel printing) and offset printing (single sheet printing). Among them, relief printing and offset printing are divided into ordinary resin ink printing and UV ink printing.
In general, paper-based face materials do not have the problem of fastness of ink adhesion, so the requirements for inks are not high, and inks of different brands have certain interchangeability and versatility. However, due to the influence of surface tension and different physical properties, aluminum foil and film materials have very strict requirements on inks. The following principles should be followed when selecting inks:
â‘ An adhesive material can only use inks produced by one ink supplier at a time, and can not mix and use similar inks produced by other manufacturers at the same time.
â‘¡ In principle, each sticker can only use matching and corresponding ink.
â‘¢ The additives used must be matched with the ink, and cannot be replaced with other types of additives.
â‘£Pay attention to the expiration date of ink, and it is strictly prohibited to use expired ink.
Note: (1) The surface tension of the film material should be ensured above 38-40dyn / cm2, otherwise, there will be ink drop after printing.
(2) The above inks should be printed in small batches first, and then used in large quantities after the quality is qualified.
3. Equipment configuration and adjustment
Different types of label printing equipment have different hardware configurations and different functions. They can be printed with different types, different materials, and different formats of label products. In order to ensure the printing and processing quality of self-adhesive labels, after the selection of raw materials and inks, the rational selection of equipment and adjustment of equipment is one of the keys to ensure the quality of label printing.
The labeling machine is a multi-functional device. Only when the various printing and processing stations cooperate and coordinate with each other with high precision can qualified labels be produced. Pay attention to the following adjustments when using labeling equipment:
1. Inking system
Care should be taken to maintain the accuracy of each rubber roller, especially the inking roller. The rubber roller should be replaced and cleaned regularly to make the system uniform ink distribution and printing plate ink uniformity.
2. Embossing device
Imprint cylinders and imprinting platforms should be cleaned frequently to keep them flat and smooth. The gears and chains between the impression cylinder and the impression platform must be kept in good mesh. Only in this way can the correct closing pressure, separating pressure and printing register be guaranteed.
3. Traction system
Regardless of whether the labeling machine feeds continuously or intermittently, the accuracy of the traction device determines the accuracy of label overprinting. The rotary labeling machine must ensure the accuracy of the transmission gear, and the intermittent labeling machine must ensure the accuracy of the unidirectional traction roller.
4. Precision of die cutting device
The accuracy of the die-cutting device includes the accuracy of the die-cutting knife and the accuracy of the die-cutting parts. The accuracy of the die-cutting device not only affects the discharge of the label, but also directly affects the application of the label, such as the accuracy of labeling when labeling and the speed of the labeling machine. Therefore, the state of the die-cutting device of the labeling device must be adjusted.
Fourth, the formulation of the process route
Determining the label printing process route is a comprehensive issue. It should be considered from the customer's requirements, the condition of the label samples, the equipment, the materials and inks selected, and the specific conditions of the printing plant. The formulation of the process route includes the following contents:
Bronzing first or later;
Glazing or lamination;
Field printing or screen printing;
Automatic labeling or manual labeling;
Independent printing or mixed printing;
Large layout printing or small layout printing;
Half-tone printing or color block and line printing;
Whether the double-sided label is printed on the back or single-sided;
Whether the label is printed once or twice;
Large-format die cutting or small-format die cutting;
Automatic waste disposal or manual waste disposal;
Whether to print on the blank space on the label or on the ink layer.
There are many problems involved in determining the process route, and using a reasonable process route will get twice the result with half the effort. Determining the process route should proceed from reality, and if necessary, process tests should be conducted to check the printing and processing suitability of the label.
V. Analysis of the application of tags
The determination of a label production process route and the determination of raw materials are related to the customer's label application effect. Keeping track of the application status and problems of labels in a timely manner is of great importance for improving the process route and the overall quality of the self-adhesive labels, so it is necessary for material suppliers and printing plants to visit end customers regularly.
The following points should be noted in understanding the application of labels:
â‘ The firmness and wear of the label ink layer;
â‘¡The corrosion resistance, shrinkage and expansion of the label;
â‘¢The working condition of the label on the labeling machine;
â‘£The weather resistance of the label, whether the ink layer and blank space are faded;
⑤Whether the label has warpage and surrounding glue leakage;
â‘¥Application of labels on printers or electronic scales.
According to the situation learned, first analyze the cause of the problem, and then you can further improve the printing and processing technology of the label by modifying the label's production process or changing the type of material.
In the above aspects, the influencing factors of sticker printing are fully introduced. In our self-adhesive printing, we can only further improve the quality of our self-adhesive printing by taking these aspects into consideration. I believe that only by ensuring the quality can we make our stickers more popular.
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