Retort packaging bags are made of multi-layer film materials, which are made into packaging bags of a certain size through dry compounding or co-extrusion compounding.
Its constituent materials are usually divided into 9 types, and its structural design should also meet the requirements of good heat sealability, heat resistance, water resistance, high strength and high barrier properties. Platinum Packaging will introduce in detail what are the commonly used materials for retort bags.
PET film retort packaging bags
The retort packaging bags of BOPET film is made of PET resin extruded through T film and then stretched in two directions. The tensile strength of the retort bag of BOPET film is the highest among all plastic films. A thin product can meet the needs and is rigid. Strong and high hardness. Cold-resistant and heat-resistant.
BOPA film retort bag
The retort bag of BOPA film is a biaxially stretched film, which can be made by blow molding and biaxial stretching at the same time. The T-die extrusion method can also be used to gradually biaxially stretch the film, and the blow molding method can be used to simultaneously biaxially stretch the film. BOPA film retort bags have good strength and toughness.
CPP film retort bag
The retort bag of CPP film is cast polypropylene film, which is a non-stretched, non-oriented polypropylene film. According to raw materials, it is divided into homopolymer CPP and copolymer CPP. The main raw material of the retort bag CPP film is block copolymer impact-resistant polypropylene.
Its performance requirements are that the Vicat softening point temperature should be greater than the cooking temperature, the impact resistance should be good, the medium resistance should be good, and the fish eyes and crystal points should be as few as possible.
Aluminum foil retort packaging bag
Aluminum foil is a type of metal foil in flexible packaging materials and is used to package items with a long application time. Aluminum foil is a metal material that has excellent water-blocking, gas-blocking, light-shielding, and flavor-retaining properties.
