All Genuine GurleyTM
bending resistance/stiffness testers are based on the same
physical principle. each instrument consists of a balanced
pendulum or pointer which is center-pivoted and can be weighted
at three points below its center. The pointer moves freely in
both left and right directions on cylindrical jewel bearings
which make the mechanism highly sensitive even to light-weighted
materials.
A sample of a specific size is
attached to a clamp (parallel for flat sheet materials and tubing
clamp for catheters, etc.), which in turn is located on one of
several positions on a motorized arm which also moves left and
right. The bottom 0.25" of the sample overlaps the top of
the pointer (a triangular shaped "vane"). During the
test the sample is moved against the top edge of the vane, moving
the pendulum until the sample bends and releases it.
On manual/motorized models, the
technician must observe the test to discern the maximum
displacement of the pointer on the scale. The value (for flat
sheet materials) reached is then located on a conversion chart to
arrive at the appropriate bending resistance/stiffness
measurement.
On digital models, the point of
release is automatically measured by an optical encoder and
displayed on a digital readout. this readout continuously
displays readings from tests performed in both the left and right
directions. In addition, the on-board microprocessor
automatically computes and displays the average of left and right
stiffness data after each measurement is performed. For flat
sheet materials, the operator can then press a button to
automatically convert the point-of-release reading on the display
to force (milligrams) which then can be multiplied by a constant
for bending moment (gram-centimeters or millinewton-meters). For
tubing, we recommend using the scale reading only for samples of
similar dimensions and material.
A complete set of accessory weights
is included with every instrument as well as a calibration strip.
Whether you are testing membranes or tubing, the Gurley Bending
Resistance/Stiffness Tester offers you the greatest range of
possibilities.
The arm, which carries the sample
clamp, is rotated left and right by a capacitor-type synchronous
motor geared-down to 2 RPM. The arm moves 75 degrees left or
right of vertical. The operator can select left or right movement
with a switch located on the front panel. The smooth, uniform
motor operation produces consistent and accurate test results.
Motors are regularly supplied for
use on 115 VAC, 50 or 60 Hz. A transformer may be obtained for
use on higher voltages.
Cylindrical jewel bearings make the
vane highly sensitive even to very lightweight materials. The
instrument is not recommended for heavy limp materials.
Four leveling screws and a circular
spirit level are used to make the base level. The loading
weights, in two sections, screw together on the pointer or are
mounted on a bracket when not in use.
Dimensions: Height 20", base 11
1/2" x 9 1/4" clamp
General Manufacturing Control
Quality in many products depends on
their degree of flexibility or stiffness. Packaging, playing
cards, boxboard fabrics, containers, wire, tubing, many plastic
and metal parts are examples. Specifications for these and others
can be established with this instrument.
Medical Manufacturing
Comfort relative to material
flexibility is an important part of the design and manufacturing
process. Adhesive bandages, laminated or coated materials and
supplies are all evaluated with a Genuine GurleyTM
bending resistance/stiffness tester.
Chemical Treatments
The effect of stiffening (as with
starch or plastic), or softening (as with glycerin or oils) can
be studied with the Gurley bending resistance/stiffness tester.
Makers or users of gums, lacquers, varnishes, latex, plastics,
waterproofing compounds, etc., can be measure the effect of such
treatments.
Textile Testing
Technicians may better quantify the
"handle" or "feel" of certain fabrics as well
as test for the effect of laundering, filling, starching or
coating. Minute weave differences as well as weights may also be
evaluated.
Research
Problems and analysis involving
stiffness measurement in product development and quality control
are easily evaluated the Gurley bending resistance/stiffness
tester clearly shows differences which would be hard to
distinguish otherwise. Its unequaled range and capacity make it
an indispensable instrument in many industries.
NOW OFFERING GURLEY, TABER &
INTERNATIONAL ENGINEERING VALUES
Genuine GurleyTM digital bending
resistance/stiffness testers output in Gurley units (milligrams) can be
converted by hand to grams centimeters and millinewton meters, making them
equivalent to Taber products, TAPPI, ISO and worldwide
standards. Information on equivalency is available from your
sales person.
MODELS AVAILABLE - FLAT SHEET
VERSIONS
Model 4171DS1N Digital Bending Resistance/Stiffness Tester with parallel clamp.
Model 4171ES1N Same as D but with RS-232 serial communications port and parallel clamp.
*
All flat sheet models meet
industry standards TAPPI #T543 and ASTM D6125-97.
 
Medical Manufacturing
Comfort relative to material
flexibility is an important part of the design and manufacturing
processes. Catheters and tubing, guide wires, artificial parts
and supplies are all evaluated with our Model 4171DT or 4171ET
Bending Resistance/Stiffness Testers. Implants and products used
in invasive and non-invasive procedures can also be tested.
Chemical, Temperature and Other
Treatments
The effect of softening, stiffening,
radiation and environmental exposure on catheters and other
materials be studied with the Gurley bending resistance/stiffness
tester.
Research
Problems and analysis involving
stiffness measurement in product development and quality control
are easily evaluated the Gurley bending resistance/stiffness
tester clearly shows differences which would be hard to
distinguish otherwise. Its unequaled range and capacity make it
an indispensable instrument in many industries.
Custom Applications
Gurley Precision Instruments can
design custom applications such as this toothbrush holder. Call
for more information.
ADVANTAGES
Durometer
Comparison. The Gurley Bending Resistance/Stiffness
Tester provides several advantages over the sole reliance on
durometer readings as an indication of stiffness.
Testing
around Longitudinal Axis. Measuring tubing stiffness at
various points around the longitudinal axis can indicate
differences in bending resistance/stiffness due to structure,
treatment, composition or defects. These differences can be
observed and enable the technician to isolate such areas on the
specimen.
Testing
of Manufacturing Processes. A Gurley tubing tester
enables customers to determine the effects of the following
factors on bending resistance/stiffness:
Coatings, Multi-wall constructions, Co-extrusions, Chemical composition,
Inserts, Multi-lumen construction, Radiation, Environmental exposure
Range
of Materials Tested. Using the precision tubing clamp
assembly or the parallel clamp, the instrument can accommodate:
Rods & wires, Monofilament, Finished products, Flat sheet materials to 0.25" thick,
Tubing, oval, polygon or asymmetrical cross sections, single or multi-lumen to 0.62" OD
MODELS AVAILABLE - TUBING
VERSIONS
Model 4171DT1N Digital Bending Resistance/Stiffness Tester
with parallel clamp and tubing clamp assemblies.
Model 4171ET1N Digital Bending Resistance/Stiffness Tester with RS-232
communications port, parallel and tubing clamp assemblies.
Both of above models include one each:
Parallel clamp #284-66
Clamp Frame #CX00910
Specimen insert #BX01222
Holder #BX01220
Accessory box w/insert #CX01019
Optional accessories in addition to above include:
Transformer (220/50 to 110/60 V) #AX02783
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