Advantages and tensile properties of PVC

Advantages of PVC packaging:

1. Good cleaning property, suitable for packaging precision instruments and sophisticated electronic components;

2. Good protection. If the inner package of shrink package is combined with the transport package hanging on the outer package, it can have good protection;

3. Good anti-theft, a variety of foods can be packed together with a large shrink film to avoid loss;

4, the stability is good, and the goods will not stagger in the packaging film;

5, beautiful appearance, close to the goods, so it is also called body-fitted packaging, suitable for all kinds of different shapes of goods packaging;

6. Good transparency, and customers can directly see the content of goods.

Heat shrinkable film is a thermoplastic film which is stretched in the production process and contracted by heat in the use process. Therefore, no matter which printing method is adopted, before designing the surface pattern, PVC heat shrinkable film manufacturers should consider the transverse and longitudinal shrinkage of the material and the allowable deformation error in all directions after shrinkage, so as to accurately reduce the patterns, characters and bar codes on containers.

1, bar code placement

Usually, the orientation of the bar code should be consistent with the orientation of printing, otherwise the bar code lines will be distorted, which will affect the scanning results and cause misreading. In addition, the color selection of label products should be mainly spot color as much as possible, and the production of white version is necessary, which can be made into full version or hollowed out according to the actual situation. The color of bar code should follow the conventional requirements, that is, the color matching of bar and blank should conform to the color matching principle of bar code. Selection of printing materials. The printing of heat-shrinkable labels has been briefly analyzed above, and the material plays a decisive role in influencing its quality except that the printing process should be well controlled. Therefore, the selection of appropriate materials is the key.

2. Size design

The transverse shrinkage rate of the shrink film materials used for printing is 50% ~ 52% and 60% ~ 62%, especially 90%, and the longitudinal shrinkage rate is required to be 6% ~ 8%. However, when the film shrinks instantly, it can't shrink completely in the horizontal and vertical directions due to the limitation of the container. In order to ensure the accurate restoration of the contracted patterns, characters and bar codes, it is necessary to consider the shape of the container, and PVC heat shrinkable film should calculate the correct size and deformation rate according to the actual situation. For shrink labels that need to turn the sheet film into a tube shape and seal the overlapping parts together with adhesive, it should be noted that the graphics and text are generally not designed at the sealing parts, so as not to affect the bonding fastness.

3. The level of patterns.

Limited by the shortcomings of flexographic printing, if the shrink film is flexographic, the image level should not be too delicate, while the gravure printing can require the image level to be richer.

4. The direction of the pattern

No matter whether PVC heat shrinkable film is printed by gravure or flexographic printing, its printing mode is mainly internal printing, and the direction relative to the pattern on the printing plate should be positive. Nowadays, there are also shrink films for table printing. In this case, the pattern direction on the printing plate should be reversed.

PVC shrink film is mainly used for food and beverage. Because PVC shrink film is harmless and clean, it is used for outer packaging. It has elegant appearance, smoothness, transparency, strong toughness and good sealing performance, and it has technical functions of keeping quality, keeping fresh, preventing dust, moisture, damage and pollution. It is deeply loved by manufacturers. PVC heat shrinkable film is not only used in food, but also in cosmetics. PVC shrink film is ideal for packaging high cosmetics, so PVC heat shrinkable film plays an important role in our daily life.

Heat shrinkable film is easy to break when printing. It is not that the quality of PVC shrink film is poor, but that there is a solvent in the printing ink used for PVC that will dissolve the PVC film, and the volatility of this solvent is small. Therefore, if the solvent used for dissolving PVC in the solvent of PVC ink is too much, the PVC shrink film will dissolve and be broken during printing. However, if the printing ink for PVC is not used, the printing fastness will not be good.

Lightweight packaging in heat shrinkable film should become the mainstream trend: reducing the weight of packaging is beneficial to the environment and the profits of enterprises. Lightweight is a commonly used industrial vocabulary at present, which is used to describe the practice of reducing the weight of packaging by using less materials to produce packaging. Generally speaking, containers of heat shrinkable film heat shrinkable film bottle, heat shrinkable film heat shrinkable film can, heat shrinkable film heat shrinkable film hose and heat shrinkable film heat shrinkable film cap are easier to achieve the goal of weight reduction.

Lightweight heat shrinkable film packaging can alleviate people's worries about environmental protection and sustainable development. More and more people choose products with good packaging, faster production speed, strong packaging and reduced weight. When Japanese enterprises sell products in large quantities, a small reduction in the amount of resin used in each package can bring considerable economic benefits to enterprises. Especially, under the premise of the price increase of resin raw materials, more and more enterprises are increasingly interested in lightweight packaging.