Application characteristics of "PVC shrink film"

In the production process of PVC shrink film, it is stretched in high temperature environment and then cooled easily, and then it reaches the setting intention. When it is heated again during use, it retracts its posture, and the heating is uneven, and the shrinkage degree and planning are not the same. At first, PVC shrink film should be produced by extrusion blow molding or extrusion tape casting, and then fully softened at melting temperature, and then stretched horizontally and vertically.

PVC shrink film can let customers directly see the packaged products, which is convenient for customers to choose products; Close to the shape of the product, it can be applied to the packaging of products with various shapes, and the contents of the packaging are universal; Anti-theft and dustproof are good; A variety of products can be packaged in a heat-shrinkable packaging bag, which avoids the loss of a single small product and is convenient for customers to carry; Choosing different resins and formulas can produce environmentally friendly shrink films with different mechanical strength and functions, which can be used for inner packaging with low strength and small product weight, and also for transport packaging (outer packaging) of mechanical products for containers with good demand strength and construction materials.

PVC shrink film is widely used in packaging industry because of its characteristics of water-stopping, durability, relatively low cost and so on. However, due to the difficulty in forming PVC shrink film, a large amount of plasticizer needs to be added. Under high temperature and excellent environment, the plasticizer and vinyl chloride monomer in PVC shrink film will dissolve out, and it will cause hidden dangers to consumers' health if it is directly contacted with food packaging.

PVC shrink film has great shrinkage and good flexibility, so it meets the requirements of most customers and is loved by many customers. As far as the current application is concerned, in the printing area of PVC shrink film labels, solvent-based inks are dominant, followed by water-based inks and free radical UV inks.

Characteristics of PVC shrink film:

It is stable at room temperature, shrinks when heated (above the glass transition temperature), and more than 70% of it shrinks in one direction. Good transparency, water resistance, pollution prevention ability and excellent insulation performance. Using it as packaging material can not only simplify the packaging process and reduce the packaging volume, but also be widely used in commodity packaging because the shrunk transparent film tightly wraps the wrapped article and can clearly show the color and shape of the article. At present, PVC shrink film in China is mainly used in the outer packaging of dry batteries.

With the widespread use of PVC shrink film in daily life, manufacturers should meet the requirements of simplicity, practicality and simplicity from the beginning of packaging design.

1. PVC shrink film can also be used to replace all kinds of cartons, which not only saves the packaging cost, but also conforms to the packaging trend.

2. PVC shrink film has shock resistance, impact resistance and good protection performance, and the packaged goods have compactness and fixity, and small parts will not stagger in the packaging.

3. The goods packed with PVC shrink film are hygienic and clean, and sealed packaging can prevent dust and moisture.

4. PVC shrink film is suitable for packaging various shapes of goods, can be close to goods, has transparency, beautiful appearance, clean and bright, and increases the attractiveness of products.

PVC shrink film and these points are introduced:

1. The thermal shrinkage rate is good, the transverse shrinkage rate is 48 3%, and the longitudinal shrinkage rate is 12 3% close to the product. It can be shrunk by thermal shrinkage machine, hair dryer or boiled water.

2. After the package is shrunk, it will be stored at 30℃ without color change such as fading and discoloration;

3. The product has a smooth surface, uniform thickness, no obvious spots, no oil stains, impurities and folds;

4. Good flexibility. After the package is shrunk, it will fall to the cement floor for three times from a height of 1m in different vertical and horizontal directions without cracking.