Low Temperature Shrink Film: A New Choice for Packaging with Low Temperature and High Efficiency Shrinkage

Low temperature shrink film, as a special member of the heat shrink film family, can achieve good shrinkage effect at a temperature much lower than that of ordinary shrink film. Ordinary shrink film often requires a higher temperature to achieve the ideal shrinkage state, while the shrinkage temperature of low temperature shrink film can be as low as 60-120℃, and even under some special formulas, the minimum shrinkage temperature can be lowered. This low temperature shrinkage characteristic makes low temperature shrink film have irreplaceable advantages in the packaging of many temperature-sensitive products. ​

Special formula and raw material composition​
The reason why low temperature shrink film can perform well at low temperatures is due to its special formula and carefully selected raw materials. From the perspective of polymer matrix, some special polyester materials are often used. These polymers themselves have a low glass transition temperature. The glass transition temperature is the temperature at which the stiffness of the polymer material changes suddenly. When the temperature is higher than the glass transition temperature, the mobility of the polymer molecular chain segments is enhanced, and the film shows good flexibility and plasticity, and is easy to shrink. ​In terms of additives, specific plasticizers are added to low temperature shrink film. These plasticizers can be better compatible with the polymer matrix, while reducing the intermolecular forces of the polymer, they will not easily migrate or volatilize during storage or use, thus ensuring the long-term stability of the film performance. Some reactive block plasticizers contain epoxy groups in their molecular structure, which can undergo grafting reactions with the hydroxyl or carboxyl groups on the polymer molecular structure when blended at high temperature, introducing their molecular chains into the polymer matrix resin structure, effectively overcoming the problem of small molecule plasticizers easily migrating to the surface of the material. Anti-aging agents, lubricants and other additives will also be added. Anti-aging agents can improve the weather resistance of the film during long-term storage and use, and prevent performance degradation caused by factors such as light and oxidation; lubricants improve the surface properties of the film and reduce the friction between the films and between the film and the packaged object. ​

Advantages of low-temperature shrinkage performance and sealing performance
The good shrinkage effect of low-temperature shrinkage film at extremely low temperatures brings many conveniences to packaging. In the packaging of some temperature-sensitive electronic products, the high-temperature shrinking process of ordinary shrink film may cause damage to the precision parts of electronic products, while the low-temperature shrink film can tightly wrap the product in a relatively low-temperature environment, which can protect the product from external physical damage and avoid potential risks caused by high temperature. In the field of pharmaceutical packaging, the active ingredients of many drugs are sensitive to temperature. The low-temperature shrinkage characteristics of low-temperature shrink film ensure the quality stability of drugs during the packaging process. In terms of sealing performance, low-temperature shrink film also performs well. When the low-temperature shrink film shrinks due to heat, it can not only fit tightly to the surface of the packaged object, but also form a firm and well-sealed bond between the film and the film during the shrinking process. This is due to the characteristics of its raw materials and special processing technology, which enables the molecular chains at the sealing part of the film to fuse and entangle with each other when the film shrinks, forming an effective barrier. This good sealing can effectively prevent external impurities such as moisture, oxygen, dust, etc. from entering the interior of the package, protect the quality and integrity of the packaged product, and extend the shelf life of the product.

Suitable for packaging of goods with requirements for shrinking temperature
The unique advantages of low-temperature shrink film make it an ideal packaging material for goods with strict requirements for shrinking temperature. In the food industry, for foods containing heat-sensitive spices, vitamins or probiotics, high-temperature shrinkage may destroy the activity of these ingredients and reduce the nutritional value and quality of the food. Low-temperature shrink film can complete the packaging in a low-temperature environment, retaining the nutrients and flavor substances in the food to the greatest extent. Some high-end chocolate products are packaged with low-temperature shrink film, which can not only prevent the chocolate from melting and deforming due to heat during the packaging process, but also maintain the taste and gloss of the chocolate through tight shrinkage and good sealing, thereby enhancing the market competitiveness of the product. In the field of cosmetics and personal care products, many products contain volatile and heat-sensitive ingredients. Low-temperature shrink film can provide beautiful and tight packaging for products without affecting the stability of these ingredients, prevent product leakage and deterioration, and show the appearance and brand image of the product. In the fields of electronic products, medical devices, etc., due to the precision of the products and their sensitivity to the environment, the application of low-temperature shrink film is becoming more and more extensive.