Under the development trend of the hottest plastic

2022-08-06
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Development trend of plastic flexible packaging materials (Part 2)

IV. high heat-resistant plastic packaging materials

heat resistant plastic flexible packaging materials used to be resistant to cooking and sterilization. They meet the packaging requirements for cooking and sterilization. Under the conditions of 120 ℃, 10 ~ 20mln cooking and sterilization or heating, there is no obvious change in external shape and quality, The packaged food will not produce container breakage during storage. The export growth of China's extruder products will show a steady and progressive situation, including loss, content leakage, microbial secondary pollution, light and heat 4. In an environment without obvious electromagnetic interference; Deterioration of contents, etc. Most cooking bags are made of multi-layer composite cooking films with shading aluminum foil as the middle layer, high barrier plastics PA and pet as the outer layer and heat sealing PE and PP as the inner layer. Some new multilayer composites containing high barrier materials such as EVOH, PVDC, MXD6 and silicon oxide evaporation film are also increasingly used

with the increasing popularity of electromagnetic cookers and microwave ovens, there is an increasing demand for packaging containers suitable for electromagnetic cookers and microwave ovens. The requirements for the packaging materials of the electromagnetic cooker and the microwave oven are that the packaging materials are not significantly deformed, damaged and the contents (additives) are not volatile under high temperature. In particular, the heating characteristics of the microwave oven do not allow the packaging materials to contain metal materials, which limits the use of cooking bags with aluminum foil as the middle layer and PE and PP as the inner layer. Therefore, now, multi-layer composite materials filled with PP and inorganic materials and packaging containers made of crystalline polyester (CPET) sheets are mostly used. New heat-resistant packaging materials with higher temperature resistance, such as polysulfone film, polyetherimide, poly 4-methylpentene (TPX)/paperboard, have also been developed. They can be divided into coarse teeth and fine teeth according to the pitch, which can withstand temperatures above 180 ℃, and can meet the requirements of electromagnetic ovens and micro wave ovens for packaging materials

v. special functional materials

functional packaging materials: other flexible packaging materials with special functions include hygroscopic, deodorizing, deodorizing, antistatic, antirust, UV blocking, volatile gas release or adsorption, convenience (easy to open and seal) and edible materials. For example, the film developed in recent years by adding iron, ascorbic acid and other compounds or activated carbon, zeolite, etc. to PE, PP and PVC has the effect of removing odor such as ammonia, mercaptan, hydrogen sulfide and dimethylamine. It is suitable for packaging agricultural and sideline products, aquatic products and raw and fresh food with special odor, and will not cross smell. It is also suitable for garbage bags

VI. nanocomposite packaging materials

nanotechnology is a high-tech science and technology rising in recent years. Polymer based nanocomposites (pnmc) are the most studied nanocomposite packaging materials. Common polymers include PA, PP, PVC, pet, etc. The plasticity, wear resistance, hardness and strength of nanocomposite plastic packaging materials have been significantly improved. The same research team has developed biodegradable lattice and reinforcement for facial bone surgery. Compared with ordinary composite PA packaging materials, the PA6 nanocomposite packaging materials first developed by Japan have increased the tensile strength and tensile modulus by 110MPa and 2.1gpa respectively, the thermal deformation temperature by 150%, and the thermal expansion coefficient and water absorption by a large margin

at present, the development trend of newly developed plastic packaging films at home and abroad is towards the direction of high performance, non-toxic, harmless, green environmental protection, high quality, low price and convenient use. Among them, the flexible packaging materials have been further developed from food packaging to non food packaging fields such as industrial packaging, pharmaceutical packaging, building materials packaging and cosmetics packaging, and their application range and consumption will be larger and larger. (Duanjun)

information source: Guangdong Printing

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