Basic properties and characteristics of 10 substra

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Basic properties and characteristics of 10 kinds of substrates commonly used in flexible packaging

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core tip: This article lists the definitions, properties and uses of 10 kinds of commonly used materials in flexible packaging. It is very suitable for newcomers to the flexible packaging industry to learn

[China Packaging News] this article lists the definitions, properties and uses of ten common materials for flexible packaging. It is very suitable for newcomers to the flexible packaging industry to learn


biaxially oriented polypropylene, with a density of 0.92/cm3, is flammable. When burning, the lower part of the flame is blue and the upper part is yellow, with a small amount of black smoke and petroleum smell

main properties:

1, colorless, high transparency

2. Excellent tensile strength, impact strength and stiffness

3. Excellent cold resistance and heat resistance: -40~120 ℃

4. Good steam resistance, poor oxygen resistance

5. It is generally used as the printing material of high transparent versatile bags and composite bags

usage: BOPP is the most commonly used packaging surface material, especially when the packaging requirements are not very high. The common thickness is 18~48 M. Due to its superior vapor barrier performance, it is suitable for light packaging of biscuits and snacks that are easy to absorb moisture


biaxially stretched nylon film, with a density of 1.15g/cm3, is flammable. Nails and sheep are necessary to make up for the shortcomings of the development of the building materials industry. The smell of burning hair

main performance:

1. Oil resistant, organic solvent resistant, non-toxic, odorless, non recycled plastic granulator. In the future, there will be a large number of customers, color and transparency

2. Good printability, good tensile strength, wear resistance and puncture resistance

3. High compressive strength

4. Good oxygen resistance, excellent cold resistance, heat resistance and oil resistance

5. It is easy to absorb moisture, with high permeability, weak stiffness and easy to wrinkle

6. Good heat and cold resistance (-60~140 ℃)

main uses: used for packaging oil fried food, frozen food, vacuum packaging, cooking sterilized food, dairy products. It is often used for repacking puncture resistant and frozen food

III. bopet

biaxially stretched polyester film, with a density of 1.4 g/cm3, is flammable. There is a lot of black smoke when burning, and black debris will be produced, with the smell of benzene

main properties:

1. High mechanical strength, strong stiffness and good impact resistance

2. Good heat and cold resistance, stable at 240 ℃

3. Good oil resistance, excellent acid resistance and poor alkali resistance

4. The permeability of oxygen and water vapor is small, which has excellent fragrance retention performance for spices

5. Good transparency and poor UV transmittance

main uses: it is commonly used to make cooking bags and vacuum aluminized substrates, and to package light and heavy packages such as broth, frozen food, rice cake or tea

IV. pvc

PVC film, with a density of 1.39 g/cm3, is transparent, nonflammable, extinguishes immediately after leaving the fire, and has a pungent smell of hydrochloric acid. It is divided into three categories: hard, semi-hard and soft, which are distinguished by the content of plasticizer in the material. At present, twisted PVC and shrinkable PVC are mostly used

main performance:

1, good oil resistance

2. Good transparency and surface gloss

3. Good ink adhesion

main uses: tablecloth, handbag, raincoat, sugar paper, bottle sticker, bottle envelope and other packaging

v. extinction OPP

biaxially stretched polypropylene extinction film is a film with extinction effect produced by CO extrusion of extinction material and polypropylene and biaxial stretching

main performance: it is a new type of packaging material with small reflectance and translucent shape

main uses: Light packaging such as high-grade paper plastic, gift bags, food packaging composite bags, etc

VI. Popp

biaxially stretched polypropylene pearlescent film, with a density of 0.7 g/cm3, is a film formed by biaxially stretching polypropylene as the main raw material and adding a certain amount of special pearlescent masterbatch

main properties:

1. It has shading property and prevents food from being affected by ultraviolet rays

2. It has beautiful pearlescent color

main uses: used for decorative light packaging of candy biscuits, chocolate, ice cream and daily necessities

VII. Kop

biaxially oriented polypropylene coating film, density 0.91 g/cm3. Kop is to apply polyvinylidene chloride (PVDC) on the surface of BOPP with a coating thickness of 1~2 M

main properties:

1. Excellent moisture resistance and air tightness

2. It has good drug resistance and can withstand common organic solvents, acids, bases and salts

3. Good permeability to prevent odor

4. It has thermal shrinkage

5. It can withstand 100 ℃ boiling water and can be used to make boiled sterilized food packaging bags

main uses: Kop has both the performance of OPP and the advantages of PVDC, excellent oxygen and humidity resistance, and good drug resistance. It has good permeability to prevent odor. It is often used to pack ham, sausage, fish and other food containing protein and fat, moon cakes and other light packaging


cellophane, namely cellulose film, also known as hydrated cellulose film, is a non thermoplastic film. It is divided into ordinary cellophane, moisture-proof cellophane and plastic coated cellophane

specific categories:

1, Pt, ordinary cellophane (untreated, transparent)

2, WST, double-sided moisture-proof cellophane

3, MT, moisture-proof, non heat sealing cellophane on both sides

4, mot, single-sided moisture-proof cellophane

5. Most, moisture-proof and heat sealing cellophane on one side

6, CPT, colored cellophane

7. LPT, low moisture-proof cellophane

8, JPT, fire-resistant cellophane

main performance:

1. Good printability, without any treatment before printing

2. It has extremely high transparency and gloss, and the color is particularly bright after printing

3, non-toxic and tasteless, it is the best traditional candy packaging material

4. It has a certain stiffness, which can increase the beauty of the package

5. Degradable materials can be degraded after being buried in the soil for four months

6. The transverse and longitudinal tear force performance is very good

main uses: used for packaging candy, food, shirts, cigarettes, cosmetics, drugs and other light packaging


polyethylene film, produced by film blowing and tape casting process. Polyethylene printing has the general advantages of gravure printing, such as excellent color reproduction effect, high production efficiency, high printing resistance and relatively low processing cost; However, the surface printing film is not as bright and beautiful as the inner printing, and has the advantages of bright colors, no fading, no fading, moisture-proof and wear-resistant, firm and practical, long storage life, no adhesion, low water absorption and no cracking; And because the film ink printed inside is printed on the inside of the film (after compounding, the ink layer is sandwiched between the two films), it will not pollute the packaging, and it is more in line with food hygiene requirements. Therefore, the film packaging with higher hygiene requirements is mostly printed inside

main properties:

1. Surface treatment strength, PE surface tension is very low, and it needs corona treatment before printing, so corona treatment strength is the key index of film printing

2. Excellent mechanical properties, such as longitudinal and transverse tensile strength, fracture productivity, etc. PE film has excellent tensile properties and is prone to tensile deformation

3. Various resistance, such as friction resistance, sun resistance, solvent resistance

4. For films with high hygienic requirements, attention should be paid to their solvent residue characteristics

main use: used in soft packaging, such as the packaging of sanitary products and cosmetics

X. aluminum foil

aluminum foil is a foil paper made of aluminum by rolling. Aluminum foil has metallic luster, good light resistance, and high reflection ability to heat and light. Metallic luster and reflective ability can improve the brightness of printing color; Good isolation, strong protection, impermeable to gas and water vapor, preventing moisture absorption and gasification of the contents, and not vulnerable to bacteria and insects; Good shape stability, not affected by humidity changes. It is easy to process, and can print, emboss, and coat the surface of aluminum foil. However, aluminum foil cannot bear force, has no sealing property, has pinholes and is easy to wrinkle, so it is generally not used alone. It is usually processed into composite materials with paper and plastic film, which overcomes the shortcomings of non sealing property and gives full play to its advantages such as isolation

the resistance of aluminum foil is strong in the workplace, and the absorption is poor. The pressure makes the printing plate and the surface of aluminum foil contact with the largest area and forces the ink to adhere. The ink is required to have strong adhesion and fast drying speed. Before the selected ink is put into the machine, a small sample must be made to test whether its hue and dryness meet the requirements

among the current packaging substrates, aluminum foil has the best barrier property. In addition to drug packaging, it is also used for trademarks and some high-end food packaging, such as beer top label, chocolate packaging, etc. Compared with paper and plastic, aluminum foil is thin, brittle and easy to wrinkle. It has higher requirements for printing equipment. It should pass through guide rollers as little as possible in the printing process

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