Model ANS-800 for Annealing and Strain Point Temperature

 The annealing and strain points of a glass are widely used production control parameters. Changes in the annealing and strain point temperatures are indications of chemistry changes. According to ASTM C-336 the annealing point temperature is the temperature at which a uniform fiber of glass (0.65 mm in diameter) elongates under an applied weight at a rate of 0.14 millimeters per minute while cooling in a special furnace at the rate of 4°C per minute. According to ASTM C-336 the strain point temperature is determined by extrapolation of the annealing point data and is the temperature at which the elongation rate is 0.0316 times the elongation rate observed at the annealing point. This test is performed in an LVDT extensometer system that is manufactured by Orton. The Orton Model ANS-800 Series has been designed to automatically monitor the elongation of the sample fiber and calculate the annealing and strain points according to the ASTM C-336 method.

(Note: If forming a fiber is not desired, is impractical, or impossible, annealing and strain point temperatures can still be determined by the Beam Bending Viscometer method), ASTM C-598.)

 

Automatic Annealing & Strain Point Determination

It takes 20 minutes to measure the annealing and strain points of a glass fiber. It’s simple. After the test fiber is pulled to meet the ASTM C-336 specified dimensions, the operator places the fiber into the preheated furnace, applies the weight, aligns the LVDT, begins the test, and walks away. The system does the rest. The operator is free to perform other tasks. Twenty minutes later, the annealing and strain point temperatures are displayed on the computer monitor. It's that easy. Model ANS-800 automatically calculates the rate of elongation, displays the annealing point temperature, and extrapolates the strain point temperature which eliminates operator differences, operator judgments, operator biases, and errors. Model ANS-800 is a FAST, EASY, ACCURATE, RELIABLE, and REPRODUCIBLE instrument for R&D and for QC checks on batch chemistry changes.

EASY: The operator requires little training. After the test fiber is pulled to meet the ASTM specified dimensions, the operator simply places the fiber into the furnace, applies the weight, clicks the START button on the computer monitor, and walks away. The operator is free to perform other tasks.

FAST: In less than twenty minutes the annealing and strain point temperatures are displayed on the computer monitor.

ACCURATE, RELIABLE, and REPRODUCIBLE: The LVDT system automatically monitors the elongation, the computer calculates the rate of elongation, and the computer determines the annealing and strain point temperatures. Operator differences, errors, and biases are eliminated. With good fibers, ±1°C is routine.

FLEXIBLE: The user can select the ASTM C-336 procedure, or modify the thermal cycle for individual testing requirements, such as high volume QC testing.

POWERFUL: The data acquisition software displays the test and conditions while the test is underway. The data review software shows the test results, and generates a report that automatically calculates the average temperature for a series of fibers.

 

Description

THUMB-ANS-800-System.jpg THUMB-ANS-800-Concept.jpg

Model ANS-800 Series
(required computer system not shown)

Concept Drawing of Model ANS-800

The Model ANS-800 Series was designed to provide the user with the choice to operate according to the ASTM C-336 procedure, or to operate the system according to a user-modified version of the ASTM C-336 test. Through the special Orton software loaded into the user supplied computer, the user selects the mode of operation, inputs the appropriate information, and the Orton software does the rest. The Orton software controls the thermal cycle, acquires the data, and analyzes the data according to the mode selected by the user.

The Model ANS-800 system is comprised of a special furnace to heat the fiber; a control system to heat and cool the furnace, a thermocouple to monitor the fiber temperature, an LVDT system to monitor the elongation of the test fiber, a software system to determine the annealing and strain points, and a software system for generating comprehensive or summary reports.

Operation

The furnace is initially heated to an equilibrium soak temperature and waits for the next test. After the fiber is inserted and the weight applied, the test is begun. The controller heats the furnace at 5°C per minute. The temperature and LVDT signals of the elongating fiber are captured by the software where the elongation rate is calculated and monitored. Once the elongation rate exceeds 0.60 millimeters per minute, the software cools the furnace at 4°C per minute. The temperature and LVDT signals are captured by the software for processing and storage. Once the elongation rate falls below 0.10 millimeters per minute the test is concluded. The annealing point, the temperature at which the elongation rate is 0.14 millimeters / minute is displayed, and the strain point, the temperature at which the elongation rate is 0.0316 time the annealing point rate is extrapolated and displayed. The furnace automatically cools to the next starting temperature and waits for the next test.




Descriptions and specifications contained in this page are for general discussion purposes, and are subject to change without notice. Please consult Orton for clarifications and specific details.

 

 

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