Production method of high-barrier nylon PE co-extruded film

Abstract

The invention discloses a production method of a high-barrier nylon PE co-extruded film, which comprises the steps that 1, a symmetric nylon film which is sequentially bonded is constructed by a glue layer, a BOPA layer and a symmetric nylon film, and the symmetric nylon film is formed by co-extruding a PE layer, a modified TO layer, a PA layer and a modified PE layer which are sequentially arranged; 2, the asymmetric nylon film which is bonded in sequence is constructed by a glue layer and a BOPA layer, and the asymmetric nylon film is formed by co-extruding a PE layer, a modified PE layer and a PA layer which are sequentially arranged; and 3, the raw materials of each layer are respectively addd into three extruders for melt processing, a three-layer co-extrusion structure is formed by means of co-extruding through a die head, cooling and molding are conducted to obtain a crude nylon film, the temperature is set at 210-300 DEG C in a molten state, the temperature of the die head is set at 210-300 DEG C, and the cooling and molding temperature is 22-50 DEG C. The product fully shows the excellent characteristics of quality guarantee, fresh keeping, long storage life, high temperature resistance, transparency and low temperature freezing resistance in use.

Description

technical field [0001] The invention relates to the technical field of co-extrusion film production, in particular to a production method of high-barrier nylon PE co-extrusion film. Background technique [0002] At present, films used in food packaging are required to have high oxygen barrier and water barrier properties. Usually, nylon or PET film is combined with PE or CPP film. PE or CPP mainly plays the role of water barrier, while for oxygen The barrier is mainly realized by nylon or PET film, so as to prevent food from oxidizing and moldy, and prolong the shelf life of food. However, the barrier performance of ordinary nylon or PET film to oxygen cannot meet the long-term shelf life of cooked food, seafood and pickled food. Storage requirements; In addition, plastic film is also used for food packaging with aluminization. Although the barrier property is good, due to the opaque aluminization film, it is impossible to directly show the appearance of food to consumers. ...

AI Technical Summary

Problems solved by technology

[0002] At present, films used in food packaging are required to have high oxygen barrier and water barrier properties. Usually, nylon or PET film is combined with PE or CPP film. PE or CPP mainly plays the role of water barrier, while for oxygen The barrier is mainly realized by nylon or PET film, so as to prevent food from oxidizing and moldy, and prolong the shelf life of food. However, the barrier performance of ordinary nylon or PET film to oxygen cannot meet the long-term shelf life of cooked food, seafood and pickled food. Storage requirements; in addition, plastic film is also used for food packaging with aluminization. Although the barrier property is good, because the aluminization film is opaque, it is impossible to directly show the appearance of food to consumers.

Images