How to effectively prevent wrinkles or tears in PE stretch film?

1. Material Selection and Specification Control
Reasonable Thickness and Tensile Strength: Selecting a thickness (10~35µm) and longitudinal/transverse tensile strength (≥37MPa) that meets packaging requirements ensures sufficient elasticity under stress, reducing the risk of tearing.

High Elongation at Break: Elongation ≥250% (single-layer) or ≥500% (double-layer) absorbs sudden stress during packaging, preventing tears caused by localized overstretching.

High-Quality Raw Materials: PE stretch film uses 100% LLDPE or a co-extruded structure, possessing high transparency, puncture resistance, and adhesion, improving the overall durability and fit of the film.

2. Equipment and Process Control
Tension and Speed ​​Matching: Maintain constant tension and moderate winding speed (50~200m/min) on the winding or packaging machine to avoid wrinkles or localized overstretching caused by acceleration or deceleration.

Using Spreader Rolls: Adding axial spreader rolls to the film conveying path effectively prevents wrinkles and uneven elongation of the film during operation.

Temperature and Humidity Control: Maintain the working environment at 20-30°C and relative humidity at 40%-60% to prevent wrinkles or embrittlement of the film due to thermal expansion and contraction caused by sudden temperature changes.

3. Operating Techniques and Precautions

Avoid Sharp Turns and Sharp Angles: When handling, stacking, or manually wrapping, use a wide turning radius as much as possible to prevent the film from being crushed and wrinkled at sharp angles.

Layered Wrapping and Uniform Stretching: Use a layered, evenly stretched method to ensure that the film is stressed evenly across the entire packaging surface, reducing tearing caused by localized stress concentration.

Timely Replacement of Worn Parts: Inspect the wear condition of mechanical parts such as the roll and guide wheels, and replace them promptly to prevent scratches or wrinkles caused by uneven parts.

4. Quality Inspection and Post-Production Maintenance

On-site Visual Inspection: After packaging, visually inspect the film surface. If small wrinkles are found, immediately re-stretch or replace the film.

Tension Monitoring System: Install tension sensors at key processes to monitor tension fluctuations in real time. Automatic alarms and shutdowns will occur in case of abnormalities.

Storage Environment Management: Unused PEstretchfilm should be stored in a dry, well-ventilated warehouse, avoiding moisture or direct sunlight to prevent aging and cracking.