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What are the packaging materials from ancient times to the present?

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oil paper linen plastic polyethylene

on the basis of the development of packaging industry, the packaging of goods has also been developed accordingly. From simple paper packaging to single-layer plastic film packaging, to the wide use of composite materials. The composite film can make the contents of packaging have the characteristics of moisturizing, fragrance preserving, beauty, fresh-keeping, avoiding light, impermeability and prolonging shelf life, so it has developed rapidly
traditional packaging materials include: paper, plastic, glass, metal, wood, bamboo and other packaging materials; Some traditional foods can also be packaged with natural things such as lotus leaves
modern packaging materials include: modern packaging materials can be expressed as composite materials, which are composed of two or more materials combined through one or more composite processes to form a composite material with certain functions. Generally, it can be divided into base course, functional layer and heat sealing layer. The base course mainly plays the role of beauty, printing and moisture resistance. Such as BOPP, BOPET, BOPA, MT, Kop, kpet, etc; The functional layer is mainly used to block and avoid light, such as VMPET, Al, EVOH, PVDC, etc; The heat sealing layer is in direct contact with the packaged goods, which has the functions of adaptability, permeability resistance, good heat sealing, transparency and opening day, such as LDPE, LLDPE, mLLDPE, CPP, VMCPP, EVA, EAA, e-maa, EMA, EBA, etc. The following is a brief description of the development, development and current situation of inner materials of composite flexible packaging materials.

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