Stretching film is widely used due to its advantages such as light weight, thin shape, low cost, easy portability, and shape changing. Especially in the packaging of food and daily necessities, agricultural covering materials, etc., the quantity and quality of stretch film are constantly improving, and the functional requirements for new stretch film materials are also increasing. Improving the quality and functionality of stretch films cannot meet the needs of market development solely by changing the resin matrix and improving the molding process. Adding various functional additives has become a simple and efficient way to achieve functionalization of stretch films.

Biaxial stretching agent

Biaxially oriented materials have always played an important role in stretch film packaging, with applications such as biaxially oriented polypropylene (BOPP), polyester (BOPET), and nylon (BOPA) becoming increasingly widespread. Traditional PVC stretch film is widely used in various vegetable and fruit preservation, long-term frozen food packaging, microwave baked food packaging, and conductive stretch film for electronic component packaging. In addition, the production of products such as cast polypropylene (CPP) and cast polyethylene (CPE) is also relatively high. The auxiliary products that cooperate with the above-mentioned packaging stretch film materials mainly include anti-static agents, smooth and anti adhesive agents, stiffening agents, heat stabilizers, antioxidants, and barrier agents.

Stretch film antistatic agent

Industrial anti-static agents are mainly single compounds or complexes of non-ionic and ionic surfactants. According to whether the hydrophilic group in its molecule can ionize, it is divided into ionic and non-ionic types, while ionic types are further divided into cationic, anionic, and zwitterionic types. The principle of anti-static is to use its hydrophilic group to absorb water vapor from the air on the surface of plastic, or to arrange a conductive layer on the surface to reduce the surface resistance value.

Cationic antistatic agents have excellent anti-static performance, but usually have poor thermal stability and are prone to decomposition and discoloration under high-temperature processing conditions. They are generally only used in PVC products. However, anionic antistatic agents cannot be used for stretch film products due to their impact on transparency.

Non ionic antistatic agents have the characteristics of low toxicity, good thermal stability, and less susceptibility to plastic aging, making them the main additive type of antistatic agent in packaging materials. The main varieties include fatty acid polyol esters, epoxyethane adducts of fatty acids, alcohols, and amines.

In packaging materials, the evaluation of the performance of anti-static agents should not only examine their anti-static effect, but also pay attention to their impact on product performance. Therefore, the key to the development of anti-static agents lies in the structural design and compatibility investigation of various surfactants. Currently, developing serialized and specialized products is an important development direction for anti-static agents.

Stretch film anti adhesive agent

The faster the processing speed, the more prone it is to generate static electricity due to friction, and the easier it is for stretch films (plastic products) to adhere to each other, seriously hindering high linear speed extrusion; The better the transparency of the stretch film, the higher the processing temperature, and the easier it is to clump and adhere. Therefore, efficient smooth agents and anti adhesive agents play an exceptionally important role in plastic production and automated packaging.

Article organization: Heshan stretch film www.hshangli.com