Heat shrinkable film has many advantages, but many people still don’t know

It’s not that many people don’t know the characteristics of packaging materials. Today, the author has half an hour before leaving work to recommend to everyone to learn some knowledge. If you don’t understand, you can call our company. Heat shrinkable film has many advantages, including: good Transparency, easy for customers to choose products; close to the shape of the product, it can be applied to various shapes of product packaging; excellent anti-theft and dust resistance; can pack a variety of products in a heat shrinkable packaging bag to prevent individual small products from being damaged Lost, it is also convenient for customers to carry; different resins and formulas can be used to produce heat shrinkable films with different mechanical strength and functions, which can be used for inner packaging with lower strength and lower weight, as well as mechanical products and construction High-strength transport packaging (outer packaging) for materials. Analysis of the domestic technology development level and development trend of shrink film in the current society. Domestic technology development level 1. Development level of production process For different types of heat shrinkable film, the production process has certain differences, and they have been developed to different degrees in China. Taking the POF heat-shrinkable film, which is currently growing rapidly in market demand, as an example, its production process has undergone a development process from a single bubble method to a double bubble method and a three bubble method. POF heat shrinkable film first used the single-bubble bidirectional stretching process, in which the polymer melt was extruded through a ring die and directly stretched vertically and horizontally. However, the product made by this method has poor transparency and low shrinkage rate, so it has been rarely used in China. The double-bubble bidirectional stretching process is to extrude the polymer melt through the ring head, and then quickly cool it with chilled water to form a cylindrical thick film, and then heat it to a certain temperature by special infrared rays, and then perform longitudinal/transverse simultaneously. Stretch. The product made by this method has good transparency and high shrinkage, and has become the most used POF heat shrinkable film production process in China. The 3-bubble biaxial stretching process is the latest domestically developed POF heat shrinkable film production process. In addition to the advantages of double-bubble products, the products produced have better dimensional stability and longer storage time. 2. Development level of production equipment Heat shrinkable film has entered the Chinese market since the beginning, and related production equipment has also been introduced into the country during the same period. Now there are several domestic plastic machinery manufacturers that can manufacture double-bubble heat shrinkable film production equipment. For domestic heat shrinkable film manufacturers, most of their equipment is outsourced, and some high-end heat shrinkable film products (such as POF, PVDC, etc.) are produced. The equipment needs to be imported. However, after years of introduction, digestion and absorption, individual domestic heat shrinkable film manufacturers can also manufacture high-performance POF heat shrinkable film production equipment. 3. Product development level Heat shrinkable film is divided into cross-linked heat shrinkable film and non-crosslinked heat shrinkable film. Cross-linked heat shrinkable film is a high value-added product. The network structure brought about by ionizing radiation treatment significantly increases the toughness of the film, so that it is not prone to delamination, unsealing, insufficient shrinkage, and insufficient shrinkage like ordinary heat shrinkable films. Quality problems such as surface damage. However, due to the complicated process of the cross-linked heat shrinkable film and the large investment in equipment, only a few countries including the United States, China and Japan can produce such products.