The latest news from American Glass Research.

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Volume 9 / Issue 2
We are pleased to share with you our recently released white paper "Identifying breakage issues in crown closure bottles" written by Dr. Clarissa L. Justino de Lima and Peter de Haan of our Delft, the Netherlands testing laboratory.  The paper was published in the March/April issue of Glass Worldwide.

Download our white paper HERE.  If you need help with your glass breakage CONTACT US.

Spring In-Person Training Seminars Update 

Our first half In-Person Training on our Butler, PA, USA campus gets underway in April and includes "Fracture 1", "Fracture 2" and "Stones in Glass".

In Europe we will be in Montecchio, Italy in May for "Fracture 1", "Evaluation and Lightweighting of Glass Container Designs" and "Fracture 3: Master Class".

Our first half European schedule wraps up in Krakow, Poland where we will host, "Fracture 3: Master Class", "Audit of Glass Plant Operations" and "Fracture 1" in June. 
See our full 2022 in-person training schedule HERE with all dates and locations.  Also get information on all of our on-demand E-seminars.

Private customized on-location training is available.

To learn more about all of our seminars, visit our Seminar Catalogue and if you have questions or would like to discuss Private Training Contact Us 
AGR Delft to conduct new "Audit of Glass Plant Operations" training seminar in Krakow

Senior Scientist Peter de Haan, will be conducting our completely updated in-person "Audit of Glass Plant Operations" training seminar on June 6 and 7 in Krakow, Poland.

This seminar has been renewed to include current best practices and technology within the glass packaging industry. The majority of the material has been completely rewritten with the addition of large sections of completely new content. The seminar, now has an increased focus on critical procedures and best practices. It also addresses the use of statistical process control. Extensive glass manufacturing experience is not a pre-requisite to benefit from this seminar.

The manufacturing process will be introduced in several easy to understand examples. For students that previously attended  our  audit seminar, the extent of new information in this version while make it more than worthwhile to attend again.

The seminar is designed to instruct personnel on how to conduct a detailed audit of a glass container manufacturing plant. Key topics include:

•    Areas that must be thoroughly reviewed
•    Importance of adherence to policies and procedures
•    Disposition of containment and rejected ware
•    Continuous improvement opportunities derived from audit data

Visit "Audit of Glass Plant Operations" in our Seminar Catalogue to learn more or to register.
Announcing our next two live webinars in our "Spotlight on" series focusing on Cord and Annealing coming this Summer

The two separate seminars are intended io provide the participants with the capability to make critical decisions regarding the control of cord and annealing stress. 

"Spotlight on: Annealing & Temper Grades" topics include:
  • Annealing principles in container manufacturing
  • Relationship between annealing stress & container performance
  • Overview of temper grade measurement using both strain discs and a polarimeter, per ASTM C148
"Spotlight on: Cord Detection & Measurement" topics include:
  • Cord types and sources during glass melting
  • Performance effects of cord on containers
  • Methods for cord detection in containers
  • Overview of cord stress measurement using ring sections and a polarized light microscope, per ASTM C78

Each live webinar will be approximately 1 to 1.5-hours in length. Both will become E-seminars that will be available on-demand.

Dr. Brandon Aldinger will be conducting both webinars. The cost is $250 per person per session.  Purchase both for only $400. Registration will be opening soon.

Contact Us if you have any questions.

Visit our E-seminar website library to see all of our on-demand content including our comprehensive "Sand to Shelf: Essentials of Glass Packaging"

Our Experts were asked...
Q: Can a glass composition change solve the problem of Thermal Shock Failure? 

First, let's examine the science behind this question to determine if such an action is viable.

  1. A container has broken at 90°F (50°C) by a type I thermal shock with a glass strength at the origin of 2250 psi (15.51 MPa).    
  2. The linear thermal coefficient of expansion (CTE, α) of the glass is 50 x 10-7/°F (90 x 10-7/°C), typical of soda-lime-silicate (SLS) glass. 
  3. The elastic modulus, E, is 10 x 106 psi (69 x 103 MPa), also typical of SLS glass. 

The goal is to determine what value of the CTE would be necessary to decrease the thermal stresses to a value of 1800 psi (12.41 MPa).  This stress level is sufficiently below the breaking strength to eliminate the breakage problem even for the weakest flaw of the strength distribution. 

The stress, S, on the outside glass surface is given by:
S = E α (ΔT/2)                                                           (1)

Re-arranging this equation for CTE gives: 
α = 2(S) / E(ΔT)                                                        (2)

If S = 1800 psi (12.41 MPa), ΔT = 90°F (50°C) and E = 10 x 106 psi (69 x 103 MPa), then the CTE, α = 40 x 10-7/°F (71.9 x 10-7/°C).  This represents a serious compositional change that would result in forming issues compared to the original CTE.  Obviously, if the glass composition has changed to this degree, the value of Young’s modulus may also change but for this calculation, it is assumed to be approximately the same as normal SLS glass. 

Thus, rather than worrying about composition and trying to make the glass more resistant to thermal shock, the correct solution would be to identify the nature of the flaw at the fracture origin and take the necessary actions to correct it, thereby increasing the glass surface strength so as to survive the modest temperature differential of 90°F (50°C). 

If you have questions about your glass please ASK OUR EXPERTS.
American Glass Research
603 Evans City Road, Butler, PA 16001
Tel: +1 (724) 482-2163
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American Glass Research · 603 Evans City Road · Butler, PA 16001 · USA

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