What are the eight most commonly used materials for flexible packaging?
Release time:
2021-11-12
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1. BOPP, formally known as biaxially oriented polypropylene (charge density ≥ 38 dy/m²).
(1) Due to molecular orientation and increased crystallinity, it exhibits excellent tensile strength, impact strength, rigidity and toughness, moisture resistance, transparency, and cold resistance.
(2) Non-toxic, odorless, and tasteless; can be used directly in contact with food and pharmaceuticals.
(3) Non-heat-sealable.
(4) Low tear strength—be careful to avoid membrane breakage caused by notches in the roll film.
(5) Must undergo corona treatment before printing or laminating.
2. CPP, scientific name: Corona-treated polypropylene (corona rating > 38 dy/m²)
(1) Excellent luster and transparency.
(2) It has moderate strength and excellent moisture-blocking performance.
(3) Possesses excellent heat-sealing properties and good heat resistance.
(4) Excellent oil resistance. (Superior to LDPE)
(5) Lifeless, without royalty, tasteless, with a fondness for greenery.
(6) Good chemical resistance
(7) Poor cold resistance: Homopolymer polypropylene exhibits low-temperature brittleness below 10°C and cannot be used in environments below 0°C; copolymer polypropylene, however, can.
(8) Highly breathable, prone to static electricity, and easily attracts dust.
3. PE, chemical name polyethylene (dielectric strength ≥ 38 dy/m²)
(1) Easy to heat seal. Softening temperature: 80-90℃; Melting point: 110-120℃
(2) High elongation, high impact strength, good flexibility and toughness,
(3) Good water resistance and moisture barrier properties, as well as excellent chemical and pharmaceutical resistance.
(4) Excellent low-temperature resistance and good flexibility under low-temperature conditions.
(5) Non-toxic, odorless, tasteless, and highly transparent.
(6) High breathability.
ThPak Packaging Co., Ltd.
ThPak Packaging Co., Ltd.
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