Embossing Sealing Degree of PE Plastic Wrap

　　Embossing Sealing Degree of PE Plastic Wrap

　　PE (polyethylene) plastic wrap is widely used for food preservation, and its embossing sealing degree directly impacts its barrier properties against moisture, air, and contaminants. Embossing machines for PE plastic wrap focus on creating hermetic seals through heat embossing, while also enhancing the film’s clinginess and puncture resistance.

　　The embossing process for PE plastic wrap involves:

　　Seal Formation: Heated embossing rollers with micro-patterns (e.g., diamond grids, linear grooves) press against overlapping PE film edges, melting the polymer to form a seal. The embossed pattern increases the contact area between film layers, creating a stronger bond than flat seals.

　　Clinginess Enhancement: Embossed micro-textures on the film surface increase electrostatic attraction, improving the wrap’s ability to cling to containers. This is critical for applications like wrapping irregularly shaped fruits or sealing food trays.

　　Puncture Resistance: Embossing can orient PE’s molecular chains, enhancing the film’s tensile strength. For example, embossed PE wrap used in commercial food packaging may have a grid pattern that reduces tearing during handling.

　　Key factors influencing sealing degree:

　　PE Grade: Low-density PE (LDPE) is more flexible and clingy, while linear low-density PE (LLDPE) offers better puncture resistance. Embossing parameters must be adjusted for different grades; LLDPE may require higher temperatures (140–160°C) compared to LDPE (120–140°C).

　　Seal Width: Industrial embossing machines for PE wrap can create seals as narrow as 2 mm (for household use) or wider than 10 mm (for heavy-duty packaging). Wider seals with complex patterns (e.g., serrated edges) provide better resistance to accidental opening.

　　Contamination Control: Even minor oil or food residue on PE surfaces can weaken seals. Embossing machines in food-grade facilities often include pre-cleaning stations (e.g., air knives, UV sterilization) to ensure seal integrity.

　　Testing the sealing degree involves methods like:

　　Leak Testing: Sealed PE packages are submerged in water and subjected to air pressure to detect bubbles.

　　Peel Force Measurement: A tensile tester measures the force required to separate embossed seals, with acceptable values typically ranging from 5–15 N/15 mm width for food packaging.

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