Proprietary Research Shows That Preform Storage Length/Conditions Can be Cause of PET Bottle Performance Issues

PET BottlesProprietary research from PTI shows that polyethylene therephthalate (PET) bottle performance issues may have their root cause in how long preforms are stored and in what environment.

“Our plant support personnel were frequently being asked what storage duration was acceptable for preforms and what problems can present themselves during longer storage periods,” said Sumit Mukherjee, chief technology officer, PTI. “With almost 40 years of experience in this area, we knew that the longer the preform is stored, the greater the impact on performance—particularly if that preform was stored in a high-humidity environment.”

To get specific answers to the question, PTI studied 2 liter and 20-ounce preforms that were more than a year old. These preforms were dried under vacuum at 40o C to get them back to a condition similar to when they were first molded.

The short answer is that preforms stored three, six or 12 months, respectively, will each process differently. The older the preform, the more difficult it will be to processing so that the container meets performance criteria. The time of year the preforms were injection molded, along with the environmental conditions in which they are kept, will also impact performance.

Additionally the study found:

  • Diminishing moisture egress rate with time from a drying perspective;
  • Wet preforms absorb more heat under same process conditions;
  • Moisture is more impactful on the properties of larger diameter preforms;
  • Drier preforms stretch less; and
  • Moisture acts as a plasticizer allowing for more stretching and lesser strain hardening.

For additional information on the study, visit www.pti-usa.com.

Share on Socials!

Related Articles

Related Articles

Markus Rustler From Theegarten-Pactec New Interpack 2023 President

At its recent constituent meeting, the advisory committee of interpack 2023 has elected Markus Rustler, President and CEO of Theegarten-Pactec GmbH & Co. KG, as President ...
Read More

We’re NOT Only “Refurbished Autobag® Machinery”

Parts, Service and Installation Specialists BAGGERS AB-180™ HS-100™ H-100® Sidepouch® FLOW WRAPPERS AllPac Ameripac FMC/Campbell CARTONERS Adco Jones CARTON ERECTORS Abc Combi Little Dave Wexxar INFEEDS ...
Read More

Brian Wirt Joins Colordyne Technologies Bringing 27 Years Of Experience

BROOKFIELD, WI - August 29, 2017 - As a Strategic Account Executive at Colordyne Technologies, Brian Wirt assumed responsibility for customer growth and acquisition by identifying ...
Read More