Blowing:
This is the main production method. Melted PE plastic is extruded through a circular die into a tubular shape. At the same time, air is blown into the tube to make it expand, cool, be pulled, and be wound up. Blow-molded films have balanced performance and are the most widely used.
Casting:
Melted PE is casted onto a cooling roller and rapidly cooled to form. Casting films have higher transparency and better flatness.
Characteristics: Highly flexible, good transparency, easy heat sealing, excellent moisture-proof performance.
Applications: The earliest type of PE film, commonly used in lightweight packaging, agricultural mulch films, coatings, etc.
Characteristics: Significantly superior to LDPE in strength, toughness, puncture resistance and tear resistance. Can be made thinner and stronger, and is currently the mainstream material in the packaging field.
Applications: Stretch wrap films, heavy-duty packaging bags, industrial linings, liquid packaging bags, etc.
Characteristics: High strength, good hardness, excellent moisture-proof performance. Lower transparency, usually semi-transparent milky white.
Applications: Shopping bags, vest bags, food bags, garbage bags, etc.
Characteristics: Performance lies between LDPE and HDPE, with good stress cracking resistance.
Applications: Air cushion films, packaging bottles, etc. In modern production processes, different types of PE resins are often blended together to complement each other's strengths and produce films that meet specific performance requirements.
