In the packaging market, flexible packaging usually refers to a variety of bags, boxes, pouches, etc. made of paper, aluminum foil, fiber, plastic film and their composites. The composite material is laminating film, which is a common packaging material and even seen everywhere in daily life, but few people will know and understand. Simply put, extruding one type of raw material onto another type of film or gluing different types of films together to form multiple layers of film is called composite film. But why you need to spend a lot of time to laminate ordinary film and form laminating film, here is a detailed understanding.
Goods basically visible in the market such as instant noodles, cookies, puffed food, milk, beverages, cooked food, pickled mustard, etc. are sold in flexible packaging. These foods are made up of the food itself and its composite packaging. You may ask, why not just make the packaged product in paper, aluminum foil, fiber or plastic film? In fact, there are some. Normal PE, PP and other films can be made directly into packaging or rubber bags, and their performance will be good. For example, paper and aluminum foil themselves are easily damaged, so they are usually not made directly into packaging. At this point, it is necessary to laminate with other materials through a series of laminating processes to achieve packaging with specific properties, i.e. laminating film.
Single-layer films have different advantages and different disadvantages. For example, PP film has high strength and excellent oil, gas and moisture resistance, but its heat sealing performance is poor; PE film has good moisture resistance and chemical stability, but its oil and gas resistance is relatively poor. If they are made separately for demanding plastic packaging, performance defects will occur in the process of food and drug packaging. In short, laminating film not only overcomes the shortcomings of single-layer materials, but also combines the advantages of each layer, making it an ideal packaging material.
Since laminating film is mainly used for packaging demanding food and pharmaceutical products, there is a requirement for various printing patterns on the packaging film. The usual practice is to print the film first and then laminate it. As the color ink is sandwiched in the middle of the film, the ink layer is not damaged by direct friction, scratches and various corrosive substances, which can well solve the problem of ink fading during the printing process, not only does not affect the beauty of the packaging, but also avoids the safety and health problems caused by direct contact between the ink and the packaging contents. It can be said to be a two-fold victory.