The quality issue of sealing lineris indeed crucial, directly affecting the sealing effect and product safety. Today, Leadtra Packaging has sorted out several common problems for you to quickly identify and prevent. 

1. Insufficient or uneven heat sealing strength

 Performance: The sealing area is prone to cracking, leakage, and poor sealing performance. 

Reason: mismatched heat sealing temperature, pressure, or time; The sealing liner is incompatible with the material of the bottle mouth; Bottle mouth contamination (such as oil stains, water stains). 

2. Abnormal breaking force

Performance: The seal is too tight to open or too loose, resulting in seal failure. 

Reason: Improper control of breaking force process parameters, uneven sealing liner material or thickness. 

3. Sealing appearance defects

Manifestation: deformation of burnt head, bubbly head, flat head (deflated head), pointed head, etc. 

Reason: Improper heat sealing parameters (such as high temperature); Poor sealing liner material or moisture; Uneven equipment pressure. 

4. Sealing failure and leakage

Performance: Leakage of air and liquid after long-term storage, and product deterioration due to moisture. 

Reason: The sealing liner undergoes a chemical reaction with the contents; Insufficient or uneven clamping force of the sealing liner; Repeated cold and hot cycles cause the sealing liner to creep. 

5. Size and assembly issues

Performance: The sealing liner cannot align with the bottle mouth, resulting in insufficient local contact width and causing leakage. 

Reason: The outer or inner diameter size of the sealing liner is set incorrectly; The precision of the bottle mouth or sealing liner mold is insufficient. 

Leadtra Packaging is a wholesale and customized manufacturer of aluminum foil sealing film, specializing in the research and development, production of various high barrier packaging materials and easy to tear sealing packaging materials. We can provide one-stop services from consultation, design, sampling, production, testing, after-sales service, etc. If you are interested in or have any questions about us, please feel free to call us for consultation.