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Three ways to reduce the printing of PVC heat shrinkable film labels

  • Categories:Industry News
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  • Time of issue:2020-11-23 14:29
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(Summary description)In offset printing, traditional embossing (Rou Yin), gravure printing and screen printing, PVC heat shrinkable film label printing gravure printing, mainly due to the large number of domestic gravure printing machines, the cost of printing and gravure printing, and The characteristics of the thickness of the ink layer, bright colors, rich layers, and such labels, long printing is mainly used, and the intaglio printing plate reaches tens of millions, such a large-capacity work is undoubtedly the most cost-effective. However, with the increasingly fierce market competition, the development of PVC heat shrinkable film and flexographic printing, machinery, ink and other technologies, the proportion of flexographic printing has increased year by year. But from the customer's point of view, more attention is paid to satisfying quality and reducing costs. What kind of printing is next.

Three ways to reduce the printing of PVC heat shrinkable film labels

(Summary description)In offset printing, traditional embossing (Rou Yin), gravure printing and screen printing, PVC heat shrinkable film label printing gravure printing, mainly due to the large number of domestic gravure printing machines, the cost of printing and gravure printing, and The characteristics of the thickness of the ink layer, bright colors, rich layers, and such labels, long printing is mainly used, and the intaglio printing plate reaches tens of millions, such a large-capacity work is undoubtedly the most cost-effective. However, with the increasingly fierce market competition, the development of PVC heat shrinkable film and flexographic printing, machinery, ink and other technologies, the proportion of flexographic printing has increased year by year. But from the customer's point of view, more attention is paid to satisfying quality and reducing costs. What kind of printing is next.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2020-11-23 14:29
  • Views:
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In offset printing, traditional embossing (Rou Yin), gravure printing and screen printing, PVC heat shrinkable film label printing gravure printing, mainly due to the large inventory of domestic gravure printing machines, the cost of printing and gravure printing, and The characteristics of the thickness of the ink layer, bright colors, rich layers, and such labels, long printing is mainly used, and the intaglio printing plate reaches tens of millions, such a large-capacity work is undoubtedly the most cost-effective. However, with the increasingly fierce market competition, the development of PVC heat shrinkable film and flexographic printing, machinery, ink and other technologies, the proportion of flexographic printing has increased year by year. But from the customer's point of view, more attention is paid to satisfying quality and reducing costs. What kind of printing is next.

1. Control of tension

Since the film is more susceptible to changes in tension during the printing process, resulting in inaccurate overprinting, it is necessary to pay great attention to tension control during the printing process to maintain a stable and balanced tension. The size of the tension adjustment should be determined according to the type and tensile strength of the film. For example, the tensile strength of the film is weak, and it is easy to stretch and deform, and the tension should be smaller; for the film with stronger tensile strength, The tension can be correspondingly greater. In the case of a certain type of film, the width and thickness of the pof heat shrinkable film are also important factors that determine the tension. The wide film should have a greater tension than the narrow film, and the thicker film should have more tension than the thin film. To

The main purpose of the PVC heat shrinkable film gravure printing unit type gravure printing machine, now these machines are equipped with automatic tension control system and automatic registration system, according to the measurement of the error between the color mark automatically adjust the open area, the tension area for printing And the living area to ensure the printing process and the final stable tension overprint accuracy. To

2. Selection of ink

There are four main types of inks used for POF heat shrinkable film printing: solvent-based inks, water-based inks, cationic UV inks and free radical UV inks. As far as the current application is concerned, in the field of shrink film label printing, solvent-based inks dominate, followed by water-based inks and free radical UV inks, while cationic UV inks are expensive and troublesome during printing. There are not many applications in the shrink film field. Pof heat shrinkable film mainly uses solvent-based inks. Different films should use special inks and cannot be mixed. Ink companies generally provide different raw materials, with three solvent ratios: fast drying, drying, and slow drying of the ink. The printing plant chooses the appropriate solvent ratio according to the actual production conditions such as workshop temperature and printing speed. In addition, water-based inks and UV inks can also be used. But no matter what type of ink must be taken into account, the ink performance indicators must meet the requirements. For example, the shrinkage of the ink must match the shrinkage characteristics of the heat shrinkable film, otherwise it will cause the ink layer to split or even deink.

3. Control of drying temperature

When printing heat shrinkable film, how to control the drying temperature is very important. If the drying temperature is too high, the material will heat shrink; if the temperature is too low, the ink will not dry completely, resulting in final adhesion and dirt on the back. Both the gravure printing machine and the flexo printing machine are equipped with inter-color drying devices to ensure that each color ink is completely dried. At the same time, in order to prevent the material from deforming during the drying process, the pof heat shrinkable film requires a cold air channel between the color sets to control the effect of residual heat.

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