When purchasing laminating film, the most fearful thing is to encounter poor quality products - not only will it affect the plastic sealing effect, but it may also damage important documents. Today I will teach you 3 simple methods to quickly judge the quality of laminating film and avoid buying poor quality products.
Method 1: Observe the appearance
Good laminating film:
The surface is flat and smooth, without scratches or bumps
The edges are cut neatly and will not cut your hands
High transparency, no fog or impurities
Poor laminating film:
There are bubbles or impurities on the surface
Rough edges, there may be burrs
Uneven light transmission, affecting the clarity of the document
Tips: Hold the film against the light, and the light transmission of high-quality films is uniform.
Method 2: Test the feel
Good laminating film:
It feels smooth but not sticky
Good flexibility, can return to its original shape after bending
Uniform thickness
Poor laminating film:
It feels sticky or too greasy
Easy to wrinkle, leaving marks after folding
Inconsistent thickness
Test method: Take a small section of the film and fold it in half several times. High-quality film will not leave creases.
Method 3: Check the temperature resistance
Good laminating film:
No pungent smell when heated
No deformation or shrinkage at high temperature
Smooth edges and no warping after plastic sealing
Poor laminating film:
Emits unpleasant smell when heated
Easy to curl and deform at high temperature
Easy to bubble at the edges after plastic sealing
Simple test: Use a hair dryer to blow hot air from a corner of the film from a distance, and high-quality film will only soften slightly.
