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Commonly used materials and properties in Flexible Packaging

BOPP is Bidirectional Tensile polypropylene (Corona Value ≥38DY/M2)

1. Due to the improvement of molecular orientation and crystallinity, its tensile strength, impact strength, rigidity and toughness, moisture resistance, transparency and cold resistance are better.

2. Non-toxic, tasteless, odorless, can be directly used in contact with food and drugs.

3. No heat sealing.

4. More brittle, low tearing strength.

5. Printing or compounding can only be carried out after corona treatment.

PET is polyester (Corona Value ≥48dy/m2)

1. High mechanical strength, can be used under thinner conditions (12μ)

2. Good transparency, light transmittance above 90%, and good gloss. Can absorb ultraviolet light.

3. Good heat resistance, cold resistance, low thermal shrinkage, and good dimensional stability.

4. Good fragrance retention. The gas barrier is better than PE, and the moisture barrier is almost the same as PE.

5. Good hygiene. Does not contain plasticizers and other substances.

PE is polyethylene (Corona Value ≥38dy/m2)

1. Easy to be heat sealed. The softening temperature is 80-90℃, and the melting point is 110-120℃.

2. High elongation, high impact strength, flexibility and toughness.

3. Good water resistance, moisture resistance, chemical resistance.

4. Excellent low temperature resistance and good flexibility under low temperature conditions.

5. Non-toxic, odorless, tasteless, and good clarity.

6. High air permeability.

7. Poor oil resistance, and oily foods are easy to seep oil when packaged.

8. It is easy to generate static electricity.

CPP is salivating polypropylene (Corona Value ≥38dy/m2)

1. Excellent gloss and transparency.

2.It has moderate strength and excellent moisture resistance.

3. It has good heat-sealability and good heat resistance.

4. Excellent oil resistance. (Better than LDPE)

5. Non-toxic, odorless, tasteless, and good in nature.

6. Good chemical resistance

7. Poor cold resistance, homo-polypropylene has low temperature brittleness below 10°C, and cannot be used in places below 0°C. Co-polypropylene can be used.

8. High air permeability, easy to generate static electricity, and easy to absorb dust.

Post time: Jan-05-2022