Different items have to use different shrink films

With the improvement of people's living standards, the classification of products is becoming more and more detailed. The packaging of products is not only limited to visual effects, but must be developed in a functional and diversified direction based on the characteristics of the products and the needs of the market. In recent years, technological progress has made the functional development of plastic packaging shrink films increasingly obvious. High-request, high-tech plastic packaging stretch films are becoming the pillar industries and Ru0026D purposes of many companies. Their packaging functions are diverse, except In addition to the requirements for antistatic, anti-blocking and smoothness of ordinary stretch films, the original materials, additives or processes are adjusted to give the packaging shrink film some special functions, such as conforming to the crispness and tightness of cigarette and beverage packaging The heat shrinkability that meets the demand of sex, the air permeability that meets the packaging needs of vegetables and fruits, the conductivity that meets the packaging needs of electronic components, the high optical performance that meets the needs of see-through packaging, the rust resistance that meets the packaging needs of metal equipment and instruments, and the increasing demand The barrier properties and antibacterial properties that are generally required in food, cosmetics, and medicine, etc., the functionalization of shrink films has increased the added value of products. The development of packaging bags has gone through four obvious stages: the original packaging bag stage, the large packaging bag stage, and the small packaging bag stage. At present, it has gradually entered a new stage of environmentally friendly (green) packaging bags. With the development of the commodity economy, the commercial nature of the packaging itself has become more and more significant. It has become a special product that is no longer attached to the production of commodities, a widely used product that all commodities cannot do without. Chinese scientists have developed an environmentally friendly plastic bag made of electrolytes. This environmentally friendly plastic bag can not only be harmlessly decomposed, but it can also be dissolved in water. According to scientists' explanations, products made of high-molecular plastic materials that are common in life will take hundreds of years to be completely decomposed and will exist on the earth for hundreds of years. According to actual figures, 80% of the used plastic bags are eventually transported to the garbage dumping area like general garbage, and only 7% of the plastics are recycled for recycling. This new environmentally friendly plastic bag will not release harmful substances during the decomposition process, and can even be decomposed into natural substances that insects love, which greatly helps protect the natural environment. Primary protection: Primary protection provides surface protection of the product, forming a very light, protective appearance around the product, so as to achieve the purpose of dustproof, oilproof, moistureproof, waterproof and anti-theft. It is especially important that the stretch film packaging makes the packaged items evenly stressed and avoids damage to the items due to uneven force, which is not possible with traditional packaging methods (bundling, packing, tape, etc.). In my country, barrier packaging stretch films are in the growing period of promotion and use. Most of the barrier stretch films consumed in China are used in the packaging of low-end products. The barrier shrink films with excellent performance need to be imported in large quantities, so there is a lot of room for market development. Big. With the development of surface printing inks for stretch film and the progress of surface printing technology, it is estimated that co-extrusion composite technology will be more developed. Under the condition of meeting functional requirements, the ultra-thin stretch film saves resources, reduces packaging waste, and meets environmental protection requirements; due to the use of new technology, the bubbles are more stable, and the thickness deviation of the stretch film is more accurately controlled. ; At present, a 5-layer co-extrusion barrier stretch film blow molding equipment has also been developed in China, but its products are generally suitable for the needs of the low-end market. Another process of the co-extrusion compounding method is co-extrusion casting. The cast stretch film is a kind of non-stretched flat produced by the polymer melt passing through a t-shaped flat-slit die and quenched on a cooling roll. Squeeze stretch film. The shrink film production line can be roughly divided into extrusion part, stretching part, slitting part and winding part. There is still a big gap between domestic equipment and foreign equipment in terms of processing accuracy, stretching speed, process parameter control, etc., so the film equipment is still mainly imported. Some special films, such as diaphragms, are more difficult to use due to special processing techniques that require improvements in general equipment. More information: