Explain the requirements of shrink film before printing.

What conditions should shrink film have before printing labels?

First, bar code placement

The bar code is usually placed in the same direction as the printing direction, otherwise the bar code lines will be distorted and the scanning results will be affected. In addition, the color selection of label products should be based on spot color as much as possible, and it can be made into full version or hollowed out according to the actual situation.

Second, the choice of printing materials

The printing materials of heat-shrinkable labels often play a decisive role. For the selected label materials, it is generally required that the shrinkage rate of film materials is within the application range, and the transverse (TD) shrinkage rate is better than the longitudinal (MD) shrinkage rate.

Third, the pattern level

Due to the shortcomings of flexographic printing, if the shrink film adopts flexographic printing, its image level should not be too delicate, while gravure printing can require richer image levels.

Fourth, the pattern direction

Whether the shrink film is printed in gravure or flexographic printing, its printing mode is mainly internal printing, which means that its direction relative to the pattern on the printing plate should be positive.

V. Size Design

The transverse shrinkage rate of shrink film materials used for printing is 50% ~ 52% and 60% ~ 62%, especially 80%, and the longitudinal shrinkage rate is required to be 6% ~ 8%. However, when the film shrinks instantly, it is easy to be limited by the container, and it can't shrink completely in the horizontal and vertical directions, so it is necessary to consider the shape of the container and calculate the correct size and deformation rate according to the actual situation.

Shrinkage film needs to have good puncture resistance, good shrinkage and corresponding shrinkage stress. In the process of shrinkage, the film cannot produce holes. Since the shrink film is often suitable for outdoor use, it is necessary to add UV anti-ultraviolet agent. It has good flexibility, not easy to be damaged, strong blasting resistance, good impact resistance, good tear resistance and strong tensile force, and can replace box packaging. The shrinkage rate is large, and the articles can be tightly wrapped after thermal shrinkage. If the PE straight-through bag (with openings at both ends) is made after thermal shrinkage, the articles can be lifted at both ends of the opening, which can bear the weight of 15KG and is convenient to carry. Good transparency, light transmittance of 80% can display products, can not shape the promotion of products, but also reduce the distribution errors in the logistics link. It is waterproof and dustproof, which can not only achieve the packaging effect, but also beautify and protect the products.

Performance of shrink film and packaging application effect;

1. Shrink packaging has good shock resistance and impact resistance, and has good protective performance;

Second, the shrink packaging is clean and dust-proof;

Third, the appearance is beautiful, which can make the film close to the goods, so shrink packaging is a body-fitted packaging;

Fourth, the goods in shrink packaging are immobile, and the packaged goods will not stagger in the packaging;

5. Good transparency, allowing customers to directly observe the integrity of goods.

Sixth, it can package goods of various shapes, and it can shrink-package goods of various shapes in the same shrink bag, which is convenient to carry;

Although the surface tension of the film is equal to or even higher than that of the ink, its surface is smooth, and the surface adsorption force without pores is small. At the same time, the opening agent, antistatic agent and anti-aging agent added to various films during resin synthesis will also affect the surface properties of the film and make its printability worse. Therefore, there are some printability problems in most shrink films currently used. Therefore, in order to improve the printability of the film surface, it is necessary to pretreat the film surface with poor printability to improve the surface tension and surface adsorption. Commonly used methods include corona treatment, plasma treatment, chemical treatment and coating treatment.

1. PVC shrink film, with large elastic tension, can wrap goods with any geometric shape tightly, and can avoid the damage caused by bundling, and has good anti-loosening, rain-proof and dust-proof effects.

Second, the manufacturer of heat-shrinkable film reminds you that PVC heat-shrinkable film is suitable for packaging requirements of various products, and can manufacture products with single-sided stickiness, so as to reduce the noise generated during winding and stretching, and reduce dust and sand grains during transportation.

Third, PVC heat shrinkable film can use good performance resin and auxiliary materials to meet the needs of different users.

4. Stretch packaging of PVC heat shrinkable film saves raw materials compared with shrink packaging, and does not need heat shrinkable packaging machine, saving energy.