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Inventory of nine major materials that can be made into retort pouches!

     The retort pouch is made of multiple layers of film materials, which are combined by dry method or co-extrusion to make a certain size pouch. Its constituent materials can be divided into 9 types. The retort pouch must be able to withstand high temperature and humid heat sterilization, and its structural design should also meet the requirements of good heat sealability, heat resistance, water resistance, high strength and high barrier properties.

Making retort bags with BOPET film

     BOPET film is made of PET resin extruded by T film and then biaxially stretched. It has excellent performance.

(1) Good mechanical properties. The tensile strength of BOPET film is the highest among all plastic films. Very thin products can meet the needs, wchich have strong rigidity and high hardness.

(2) Cold resistance and excellent heat resistance. The applicable temperature range of BOPET film is from 70 to 150°C. It maintains excellent physical properties in a wide temperature range and is suitable for most product packaging.

(3) Good barrier performance. It has excellent comprehensive water and gas barrier properties. Unlike nylon, which is more affected by humidity, its water blocking rate is similar to PE, and the air permeability coefficient is extremely small. It has extremely high barrier properties to air and odor, and is one of the fragrance-preserving materials.

(4) Chemical resistance, grease resistance and most solvents, dilute acids, dilute alkalis, etc.

Making retort pouch with BOPA film

    BOPA film is a biaxially stretched film, which can be made by simultaneous biaxial stretching by a blow molding method. The film can also be biaxially stretched step by step by T-die extrusion method, and can be made by simultaneous bidirectional stretching by blow molding method. The characteristics of BOPA film are as follows:

(1) Excellent strength and toughness. The tensile strength, tear strength, impact strength and rupture strength of BOPA film are among the best plastic materials.

(2) Outstanding flexibility, resistance to pinholes, and not easy to pierce the contents, is a major feature of BOPA, good flexibility, and good packaging feel.

(3) Good barrier properties, good fragrance retention, and resistance to chemicals other than strong acids, especially oil resistance.

(4) The temperature range is wide, the melting point is 225℃, and it can be used for a long time between -60~130℃. The mechanical properties of BOPA remain stable at low and high temperatures.

(5) The performance of BOPA film is greatly affected by humidity, especially dimensional stability and barrier properties. When BOPA film is damp, except for wrinkles, it generally stretches laterally. Longitudinal shortening, the maximum elongation rate can reach 1%.

Making retort bags with CPP film

    CPP film is a kind of cast polypropylene film, which is a non-stretched, non-oriented polypropylene film. According to the raw materials, it is divided into homopolymer CPP and copolymer CPP. The main raw material of cooking grade CPP film is block copolymer impact-resistant polypropylene. The performance requirements are: 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.

Use aluminum foil to make retort pouches

    Aluminum foil is the only metal foil in flexible packaging materials, used for packaging items that have a long application time. Aluminum foil is a metal material, and its water-blocking, gas-blocking, light-shielding, and taste-preserving properties are incomparable to any other packaging material. It is a packaging material that cannot be completely replaced so far.

Making retort bags with ceramic evaporation film

    Ceramic evaporation film is a new type of packaging film. It is a film obtained by using plastic film or paper as the substrate and vaporizing metal oxides on the surface of the substrate in a high vacuum equipment. The characteristics of the ceramic evaporation film are mainly:

(1) Excellent barrier properties, almost comparable to aluminum foil composite materials.
(2) Good transparency, microwave permeability, high temperature resistance, suitable for microwave food.
(3) Good fragrance retention. The effect is the same as glass packaging, and it will not produce peculiar smell after long-term storage or high temperature treatment.
(4) Good environmental protection. Low combustion heat, less residue after incineration.

Making retort pouch with PEN film

     The structure of PEN is similar to PET. PEN has various properties of PET, and almost all properties are higher than PET. Excellent overall performance, high strength, good heat resistance, good barrier properties, transparency, excellent UV resistance is the biggest highlight of PEN, PEN’s barrier to water vapor is 3.5 times that of PET, barrier to various gases Sex is four times that of PET.

Making retort bags with BOPI film

     The operating temperature range of BOPI is extremely wide, reaching -269~400℃, the film that has been reacted has no melting point, and the glass transition temperature is between 360~410℃. It can be used continuously for more than 15 years at 250℃ in the air, and there is little change in performance. . BOPI has excellent comprehensive properties, high physical and mechanical properties, radiation resistance, chemical solvent resistance, dimensional stability, softness and folding resistance.

Making retort bags with PBT film

    PBT film is one of thermoplastic polyester films, namely, butylene terephthalate film. The density is 1.31~1.34g/cm³, the melting point is 225~228℃, and the glass transition temperature is 22~25℃. PBT film has better properties than PET film. PBT has excellent heat resistance, oil resistance, aroma retention and heat sealability, and is suitable for the production of microwave food packaging bags. PBT film has good barrier properties and can be used to package flavored food. PBT film has excellent chemical resistance.

Making retort pouch with TPX film

    TPX film is copolymerized with 4-methylpentene-1 and a small amount of 2-olefin (3%~5%). It is the lightest specific gravity among all plastics, only 0.83g/cm³, and other properties are also very good. In addition, TPX has good heat resistance and is the material with the best heat resistance among polyolefins. It has a crystalline melting point of 235°C, good weak mechanical properties, high tensile modulus and low elongation, strong chemical resistance, oil resistance, and high acid resistance. , Alkali, water, resistance to most hydrocarbons, solvent resistance temperature up to 60℃, surpassing all other transparent plastics, high transparency, light transmittance up to 98%, crystal clear appearance, strong decoration, and microwave penetration Strong.


    Duxia package is a manufacturer specializing in the production of retort pouch/retort bags. We can customize  different kinds of retort pouches by customer’s needs. In addition, the pattern design can be made according to customer needs. Welcome inquiry!

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