Advantages of Leak Testing Bottles in Blow Molding Manufacturing

Leak Testing BottlesTo ensure blow molding product quality, it’s important to have a procedure in place for leak testing the plastic bottles that are produced through the blow molding manufacturing process.

The majority of clear bottles and other product containers that are used by manufacturers are typically produced through high-volume, high-speed blow molding machines. The standard and most commonly made bottle types created through PET blow molders include water bottles, juice bottles, bottles for carbonated beverages, sport drinks, and containers for other liquid products like food sauces, food oils, and liquid soaps, shampoos, and detergents. (PET stands for Polyethylene Terephthalate; a thermoplastic polymer resin that’s used in the making of injection molding and blow-molded bottles and similar products.) Based on manufacturing quotas, quality control assurances, and getting the product to market, a highly reliable method of leak testing the bottles and other containers must be in place. The purposes of leak testing bottles in the blow molding process are to:

  • Test product quality to ensure that the bottles will remain impenetrable and hold pressure, including against the stresses of transportation and getting the products to market;
  • Check for and address the most likely critical defects in the formed products;
  • Employ a full-proof inspection process that far outweighs a random sampling method;
  • Monitor the blow molding process by way of the products generated; thereby addressing any manufacturing pitfalls prior to full high-volume runs. 

Some of the most common product defects that might occur include:

  • Crooked (tilted) necks;
  • Contamination holes and fissures;
  • Seal nicks, gaps and openings;
  • Laser coding holes

Any of these container flaws would be catastrophic to the product, particularly in high-volume runs. The advantages of leak testing bottles therefore, are to ensure a reliable product run with minimal risk of generating flawed products. Having a high-quality leak testing system in place will protect the investment while minimizing the risk of production downtime. This translates to an assurance of product quality and inventory, while preventing any of the associated problems of discarded containers, costly product damage, and inventory returns. In short, leak testing is an essential part of the blow molding process.

To learn more about how superior blow molding machines and methods are indispensable to the products your company produces, contact PET All Manufacturing Inc. – an industry leader in blow molding equipment and processes. Contact 905-305-1797 or email

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